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# Expansion

## weitere Zeitschriftenartikel

05-12-2021 | Tunnel Engineering

### Characteristics and Mitigation Measures of Floor Heave in Operational High-Speed Railway Tunnels

The rapid development of high-speed railway tunnels has resulted in the increased application of ballastless track slabs. However, floor heave induces ballastless track slab deformation as a result of surrounding rock pressure, imposing serious …

Authors:
Dongping Zhao, Haobo Fan, Lingli Jia

01-12-2021 | Original Article | Issue 1/2021

### Integrating location and textual information for detecting affected people in a crisis

Social networks have become a major source of news with millions of people writing and trading news daily. At the occurrence of any event, news spread faster on social networks compared to other news sources, which makes them a good source for …

Authors:
Esraa Karam, Wedad Hussein, Tarek F. Gharib

01-12-2021 | Original Article | Issue 1/2021 Open Access

### Corporate social responsibility and stakeholder engagement in Ghana’s mining sector: a case study of Newmont Ahafo mines

Even though the concept of Corporate Social Responsibility (CSR) has been applauded for several decades, the concept of stakeholder engagement is relatively new to the Ghanaian mining sector. This study investigates the CSR process of an …

Authors:
Peter Ansu-Mensah, Emmanuel Opoku Marfo, Lyon Salia Awuah, Kwame Oduro Amoako

01-12-2021 | Research | Issue 1/2021 Open Access

### Short-term passenger flow forecast for urban rail transit based on multi-source data

Short-term passenger flow prediction in urban rail transit plays an important role because it in-forms decision-making on operation scheduling. However, passenger flow prediction is affected by many factors. This study uses the seasonal …

Authors:
Wei Li, Liying Sui, Min Zhou, Hairong Dong

01-12-2021 | Research | Issue 1/2021 Open Access

Recently, unmanned aerial vehicle (UAV) acts as the aerial mobile edge computing (MEC) node to help the battery-limited Internet of Things (IoT) devices relieve burdens from computation and data collection, and prolong the lifetime of operating.

Authors:
Wen-Tao Li, Mingxiong Zhao, Yu-Hui Wu, Jun-Jie Yu, Ling-Yan Bao, Huan Yang, Di Liu

01-12-2021 | Research | Issue 1/2021 Open Access

### A review: preprocessing techniques and data augmentation for sentiment analysis

In literature, the machine learning-based studies of sentiment analysis are usually supervised learning which must have pre-labeled datasets to be large enough in certain domains. Obviously, this task is tedious, expensive and time-consuming to …

Authors:
Huu-Thanh Duong, Tram-Anh Nguyen-Thi

01-12-2021 | Research | Issue 1/2021 Open Access

### Producing a village input–output table (VIOT) from household survey data: a case study of a VIOT for a rural village in northern Lao PDR

In this study, a village input–output table (VIOT) is built from household survey data from a rural village in a developing country to capture the interdependency between households through their transactions in 2016. This VIOT is a simple, but …

Authors:
Soulixay Hongsakhone, Moinul Islam, Masaru Ichihashi

01-12-2021 | Original Article | Issue 1/2021 Open Access

### Research on Key Issues of Consistency Analysis of Vehicle Steering Characteristics

Given the global lack of effective analysis methods for the impact of design parameter tolerance on performance deviation in the vehicle proof-of-concept stage, it is difficult to decompose performance tolerance to design parameter tolerance. This …

Authors:
Yanhua Liu, Xin Guan, Pingping Lu, Rui Guo

01-12-2021 | Research | Issue 1/2021 Open Access

### Enterprise adoption of cloud computing with application portfolio profiling and application portfolio assessment

With the continued appeal and adoption of cloud computing, an assessment of cloud run costs and migration affordability prior to adoption would assist enterprises that have several legacy applications targeted for cloud migration. However, as …

Authors:
Kent Ramchand, Mohan Baruwal Chhetri, Ryszard Kowalczyk

01-12-2021 | Research | Issue 1/2021 Open Access

### Querying knowledge graphs in natural language

Knowledge graphs are a powerful concept for querying large amounts of data. These knowledge graphs are typically enormous and are often not easily accessible to end-users because they require specialized knowledge in query languages such as …

Authors:
Shiqi Liang, Kurt Stockinger, Tarcisio Mendes de Farias, Maria Anisimova, Manuel Gil

01-12-2021 | Research | Issue 1/2021 Open Access

### The effect of driver variables on the estimation of bivariate probability density of peak loads in long-term horizon

It is evident that developing more accurate forecasting methods is the pillar of building robust multi-energy systems (MES). In this context, long-term forecasting is also indispensable to have a robust expansion planning program for modern power …

Authors:

01-12-2021 | Methodology | Issue 1/2021 Open Access

### A GPU based multidimensional amplitude analysis to search for tetraquark candidates

The demand for computational resources is steadily increasing in experimental high energy physics as the current collider experiments continue to accumulate huge amounts of data and physicists indulge in more complex and ambitious analysis …

Authors:
Nairit Sur, Leonardo Cristella, Adriano Di Florio, Vincenzo Mastrapasqua

01-12-2021 | Research | Issue 1/2021 Open Access

### Body weight estimation of yak based on cloud edge computing

In stock farming, the body size parameters and weight of yaks can reasonably reflect the growth and development characteristics, production performance and genetic characteristics of yaks. However, it is difficult for herders to measure the body …

Authors:
Yu-an Zhang, Zijie Sun, Chen Zhang, Shujun Yin, Wenzhi Wang, Rende Song

01-12-2021 | Research | Issue 1/2021 Open Access

### Investigation on the Mechanical Properties and Microstructure of Eco-friendly Mortar Containing WGP at Elevated Temperature

The properties of mortars containing waste glass powder (WGP) as a cement substitute for sustainable construction at various high temperatures were investigated. For this purpose, specimens from four mixtures with WGP at various percentage levels …

Authors:

01-12-2021 | Original Article | Issue 1/2021 Open Access

### Support and Positioning Mechanism of a Detection Robot inside a Spherical Tank

Large pressure equipment needs to be tested regularly to ensure safe operation; wall-climbing robots can carry the necessary tools to inspect spherical tanks, such as cameras and non-destructive testing equipment. However, a wall-climbing robot …

Authors:
Chunlei Tu, Shanshan Jin, Kai Zheng, Xingsong Wang, Sichong Sun

01-12-2021 | Original Article | Issue 1/2021 Open Access

### Aerodynamic Characteristics of Isolated Loaded Tires with Different Tread Patterns: Experiment and Simulation

The current research of tire aerodynamics mainly focus on the isolated and simplified tread tire. Compared with the real complex pattern tire, the tread pattern structure and deformed profile of a loaded tire has a greatly influence on tire …

Authors:
Haichao Zhou, Zhen Jiang, Guolin Wang, Shupei Zhang

01-12-2021 | Original Article | Issue 1/2021 Open Access

### Water-Jet Cavitation Shock Bulging as Novel Microforming Technique

With the continuous expansion of the application range of microelectromechanical systems, microdevice forming technology has achieved remarkable results. However, it is challenging to develop new microforming processes that are low cost …

Authors:
Fuzhu Li, Haiyang Fan, Yuqin Guo, Zhipeng Chen, Xu Wang, Ruitao Li, Hong Liu, Yun Wang

01-12-2021 | Original Article | Issue 1/2021

### Compartment modelling and eigenvalue expansion to study the drug concentration in capillary and tissue regions surrounding the malignant tumour

The drug transport mechanism in the biological tissue can be modelled for its effective and efficient performance. Mathematics is playing a key role in almost all biomedical research problems including drug kinetics. A mathematical model based on …

Authors:
K. Nazir, S. Mubarak, A. H. Lone, Roohi Bhat, F. A. Zargar, M. A. Khanday

01-12-2021 | Original Article | Issue 1/2021 Open Access

### Face Grinding Surface Quality of High Volume Fraction SiCp/Al Composite Materials

The existing research on SiCp/Al composite machining mainly focuses on the machining parameters or surface morphology. However, the surface quality of SiCp/Al composites with a high volume fraction has not been extensively studied. In this study …

Authors:
Xu Zhao, Yadong Gong, Guiqiang Liang, Ming Cai, Bing Han

01-12-2021 | Research | Issue 1/2021 Open Access

### Dunkl-type generalization of the second kind beta operators via -calculus

The main purpose of this research article is to construct a Dunkl extension of ( p , q ) $(p,q)$ -variant of Szász–Beta operators of the second kind by applying a new parameter. We obtain Korovkin-type approximation theorems, local approximations …

Authors:
Md. Nasiruzzaman, Abdullah Alotaibi, M. Mursaleen

01-12-2021 | Original Article | Issue 1/2021

### Big data analytics of social network marketing and personalized recommendations

A fan page is a kind of a social network. Social network marketing (SNM) is a form of Internet marketing involving the creation and sharing of content on social media networks to achieve marketing and selling goals. In addition, precise SNM …

Authors:
Shu-Hsien Liao, Ching-An Yang

01-12-2021 | Original Article | Issue 1/2021 Open Access

### Interfacial Bonding Mechanism and Mechanical Performance of Continuous Fiber Reinforced Composites in Additive Manufacturing

The additive manufacturing of continuous fiber composites has the advantage of a high-precision and efficient forming process, which can realize the lightweight and integrated manufacturing of complex structures. However, many void defects exist …

Authors:
Congze Fan, Zhongde Shan, Guisheng Zou, Li Zhan, Dongdong Yan

01-12-2021 | Research | Issue 1/2021 Open Access

### Identification and detection algorithm of electric energy disturbance in microgrid based on wavelet analysis and neural network

In the presence of power disturbance, the test accuracy of power is not good, in order to improve the performance of power testing, it is necessary to carry out the power disturbance detection design. A power disturbance detection algorithm based …

Authors:
Songjin Liu, Dongsheng Yang

01-12-2021 | Research | Issue 1/2021 Open Access

### Industrial efficiency analysis based on the spatial panel model

High-tech industrial agglomeration is conducive to boosting technological progress, promoting industrial structure upgrading and realizing economic transformation, and certainly affects the overall industrial environmental efficiency. However, few …

Authors:
Xiaobo Yin, Liyan Guo

01-12-2021 | Original Article | Issue 1/2021 Open Access

### Investigation of Two-Dimensional Ultrasonic Surface Burnishing Process on 7075-T6 Aluminum

A novel two-dimensional ultrasonic surface burnishing process (2D-USBP) is proposed. 7075-T6 aluminum samples are processed by a custom-designed 2D-USBP setup. Parameter optimization of 2D-USBP is conducted to determine the best processing …

Authors:
Zhenyu Zhou, Qiuyang Zheng, Cong Ding, Guanglei Yu, Guangjian Peng, Zhongyu Piao

01-12-2021 | Research | Issue 1/2021 Open Access

### Time-Dependent Analysis of Precast Segmental Bridges

Prestressed segmentally constructed balanced cantilever bridges are often subjected to larger deflections than those predicted by calculations, especially for long-term effects. In this paper, the case of modular balanced cantilever bridges, which …

Authors:
Gian Felice Giaccu, Davide Solinas, Bruno Briseghella, Luigi Fenu

01-12-2021 | Research | Issue 1/2021 Open Access

### A sample decreasing threshold greedy-based algorithm for big data summarisation

As the scale of datasets used for big data applications expands rapidly, there have been increased efforts to develop faster algorithms. This paper addresses big data summarisation problems using the submodular maximisation approach and proposes …

Authors:
Teng Li, Hyo-Sang Shin, Antonios Tsourdos

01-12-2021 | Methodology | Issue 1/2021 Open Access

### Modeling and tracking Covid-19 cases using Big Data analytics on HPCC system platformm

This project is funded by the US National Science Foundation (NSF) through their NSF RAPID program under the title “Modeling Corona Spread Using Big Data Analytics.” The project is a joint effort between the Department of Computer & Electrical …

Authors:
Flavio Villanustre, Arjuna Chala, Roger Dev, Lili Xu, Jesse Shaw LexisNexis, Borko Furht, Taghi Khoshgoftaar

01-12-2021 | Research | Issue 1/2021 Open Access

### Evaluation of recent advances in recommender systems on Arabic content

Various recommender systems (RSs) have been developed over recent years, and many of them have concentrated on English content. Thus, the majority of RSs from the literature were compared on English content. However, the research investigations …

Authors:
Mehdi Srifi, Ahmed Oussous, Ayoub Ait Lahcen, Salma Mouline

01-12-2021 | Research | Issue 1/2021 Open Access

### On a class of Hilbert-type inequalities in the whole plane related to exponent function

By introducing a kernel involving an exponent function with multiple parameters, we establish a new Hilbert-type inequality and its equivalent Hardy form. We also prove that the constant factors of the obtained inequalities are the best possible.

Author:
Minghui You

01-12-2021 | Original Article | Issue 1/2021 Open Access

### Defining and measuring probabilistic ego networks

Analyzing ego networks to investigate local properties and behaviors of individuals is a fundamental task in social network research. In this paper we show that there is not a unique way of defining ego networks when the existence of edges is …

Authors:
Amin Kaveh, Matteo Magnani, Christian Rohner

01-12-2021 | Original Article | Issue 1/2021

### The design of medical IoT operation information platform using reactive algorithm and e-commerce O2O mode

To apply the internet of things (IoT) to the medical operation system of the new era under the e-commerce online to offline (O2O) mode to realize the intelligent management of medical operation, first, the theoretical basis of the medical …

Author:
Xiuli Shao

01-12-2021 | Research | Issue 1/2021 Open Access

### Joint optimization of computing ratio and access points’ density for mixed mobile edge/cloud computing

Cooperation between the mobile edge computing (MEC) and the mobile cloud computing (MCC) in offloading computing could improve quality of service (QoS) of user equipments (UEs) with computation-intensive tasks. In this paper, in order to minimize …

Authors:
Tianqi Jing, Shiwen He, Fei Yu, Yongming Huang, Luxi Yang, Ju Ren

01-12-2021 | Research | Issue 1/2021 Open Access

### Multi-chain and data-chains partitioning algorithm in intelligent manufacturing CPS

This paper proposes a new algorithm for the blockchain system based on multi-chain storage for CPS under edge cloud computing, in which the nodes of the system are divided according to the relationship of communication tightness.The experimental …

Authors:
Suisheng Li, Hong Xiao, Jingwei Qiao

01-12-2021 | Survey Paper | Issue 1/2021 Open Access

### A survey on data‐efficient algorithms in big data era

The leading approaches in Machine Learning are notoriously data-hungry. Unfortunately, many application domains do not have access to big data because acquiring data involves a process that is expensive or time-consuming. This has triggered a …

Author:

01-12-2021 | Original Article | Issue 1/2021 Open Access

### Microfinance institutions’ operational self-sufficiency in sub-Saharan Africa: empirical evidence

The topic of financial sustainability in microfinance institutions has become more important as an increasing number of Microfinance Institutions (MFIs) seek operational self-sufficiency, which translates into financial sustainability. This study …

Authors:
Laxmi Remer, Hanna Kattilakoski

01-12-2021 | Original Article | Issue 1/2021

### Biological analysis and application research of the influence of exercise on pulse wave velocity (PWV)

Pulse wave velocity (PWV) refers to the conduction velocity of the pressure wave propagated by the wall of the aorta when the human heart beats. In most cases, people regard it as an important indicator for evaluating the stiffness of arteries. In …

Authors:
Kai Jiang, Yuntao Zhou

01-12-2021 | Research | Issue 1/2021 Open Access

### Impulsive noise modeling and robust receiver design

Interference is an important limitation in many communication systems. It has been shown in many situations that the popular Gaussian approximation is not adequate and interference exhibits an impulsive behavior. This paper surveys the different …

Authors:
Laurent Clavier, Gareth W. Peters, François Septier, Ido Nevat

01-12-2021 | Research | Issue 1/2021 Open Access

### Dual-channel convolutional neural network for power edge image recognition

In view of the low accuracy and poor processing capacity of traditional power equipment image recognition methods, this paper proposes a power equipment image recognition method based on a dual-channel convolutional neural network (DC-CNN) model …

Authors:
Fangrong Zhou, Yi Ma, Bo Wang, Gang Lin

01-08-2021 | Research Article | Issue 4/2021

### Information networks fusion based on multi-task coordination

Information networks provide a powerful representation of entities and the relationships between them. Information networks fusion is a technique for information fusion that jointly reasons about entities, links and relations in the presence of …

Authors:
Dong Li, Derong Shen, Yue Kou, Tiezheng Nie

01-08-2021 | Research Article | Issue 4/2021

### Incremental join view maintenance on distributed log-structured storage

Modern database systems desperate for the ability to support highly scalable transactions and efficient queries simultaneously for real-time applications. One solution is to utilize query optimization techniques on the on-line transaction …

Authors:
Huichao Duan, Huiqi Hu, Weining Qian, Aoying Zhou

01-06-2021 | Issue 1/2021

### Smooth and Strong PCPs

Probabilistically checkable proofs (PCPs) can be verified based only on a constant amount of random queries, such that any correct claim has a proof that is always accepted, and incorrect claims are rejected with high probability (regardless of …

Author:

01-06-2021 | Technical paper | Issue 2/2021

### Shear wave velocity profiling and ground response analysis in Phuentsholing, Bhutan

Shear wave velocity is directly related to earthquake energy characteristics and is a useful parameter in estimating the surface motion parameters. Shear wave velocities can be obtained from geophysical investigation or by empirical correlations.

Authors:
Karma Tempa, Nimesh Chettri, Lily Gurung, Dipendra Gautam

01-06-2021 | Technical paper | Issue 2/2021

### High-temperature performance of ambient-cured alkali-activated binder concrete

Owing to their lower carbon footprint and efficient performance compared to portland cement (PC), alkali-activated binders (AAB) show promising potential as an alternative to PC. The present paper investigates the high-temperature performance of …

Authors:
Kruthi Kiran Ramagiri, Darshan Rajesh Chauhan, Shashank Gupta, Arkamitra Kar, Dibyendu Adak, Abhijit Mukherjee

01-06-2021 | Technical paper | Issue 2/2021

### Experimental and analytical investigation on the age-dependent tensile strength of low-calcium fly ash-based concrete

In this study, the age-dependent splitting and flexural tensile strength have been investigated by incorporating the various percentages of fly ash in the plain concrete mixes. The partial replacement of cement by fly ash was varied from 0 to 60% …

Authors:
A. Fuzail Hashmi, M. Shariq, A. Baqi

01-06-2021 | Technical paper | Issue 2/2021

### Behavior of high-strength concrete with sugarcane bagasse ash as replacement for cement

Today, the world is looking for materials that can be effectively used in construction without affecting environmental sustainability. The use of agro-industrial wastes as a constructional material will support in either way of waste handling and …

Authors:
R. Dineshkumar, P. Balamurugan

01-06-2021 | Issue 1/2021

### Resolution with Counting: Dag-Like Lower Bounds and Different Moduli

Resolution over linear equations is a natural extension of the popular resolution refutation system, augmented with the ability to carry out basic counting. Denoted $${\rm Res}({\rm lin}_R)$$ Res ( lin R ) , this refutation system operates with …

Authors:
Fedor Part , Iddo Tzameret

01-06-2021 | Technical paper | Issue 2/2021

### Effect of metakaolin-based geopolymer concrete on the length of rigid pavement slabs

Rigid pavement is one of the pavement methods used specially in high traffic zones. Up till now, Portland cement concrete (PCC) is the most commonly used material for rigid pavement. One of the problems that faces PCC is the allowable spacing for …

Authors:
M. S. Eisa, M. E. Basiouny, E. A. Fahmy

01-06-2021 | State-of-the-art paper | Issue 2/2021

### Nondestructive volumetric quantification of irregular shaped soil samples using close-range photogrammetry

The main purpose of this study is to introduce a noncontact and nondestructive methodology to determine the volumetric properties of irregular shaped bulk soil specimens using close-range photogrammetry. To this accomplishment, 3D models of soil …

Authors:
Okan Onal, Araz Gharehaghajlou

01-06-2021 | State-of-the-art paper | Issue 2/2021

### A comparison between the consistency limits of lateritic soil fractions passing through sieve numbers 40 and 200

Fine-grained soils, according to ASTM standard, are soils in which more than 50% of the particles pass-through sieve number 200 (< 0.075 mm). However, Atterberg limits tests used in designating fine-grained soils as silt or clay have been …

Authors:
Lekan. O. Afolagboye, Yusuf A. Abdu-Raheem, Damilola E. Ajayi, Abel O. Talabi

01-06-2021 | Original Paper | Issue 2/2021

### Experimental Research on Sliding Friction of Dense Dry Particles Lubricated Between Parallel Plates

For the friction pairs, adding suitable lubricating media is one of the key technologies to ensure their safe, reliable and efficient operation. With the development of industry and aerospace technology, extreme working conditions such as high …

Authors:
Fanjing Meng, Huabo Liu, Shaozhen Hua, Minghua Pang

01-06-2021 | Technical paper | Issue 2/2021

### Analysis and design of emergency field isolation hospital building using innovative rapidly construction prefabricated units to treat patients infected with COVID-19

Coronavirus pandemic is the most catastrophic phenomena of nature. In a major disaster which affected substantially to human lifecycle and property loss. Instant rehabilitation for the people affected with coronavirus was essential. As an …

Authors:

01-06-2021 | Practice-oriented paper | Issue 2/2021

### Hydro-morphological simulation for Blue beach, Gaza Strip, Palestine

Man-made improvements to the coastal areas can have a drastic short- and long-term impact on the sediment balance. This paper investigates the morphological changes at the Blue beach, Gaza Strip, Palestine. The Blue Beach resort is extremely …

Authors:
Ali Masria, Mazen Abualtayef, Ahmed Khaled Seif

01-04-2021 | Original Article | Issue 1/2021

### The Influence of Activities and Socio-Economic/Demographic Factors on the Acceptable Distance in an Indian Scenario

Type of activity is an important aspect that influences the travel behavior of the trip makers. The present study uses the concept of an acceptable trip distance to compare the walking characteristics across subgroups of various socio-demographic …

Authors:
T. M. Rahul, M. Manoj, Divyakant Tahlyan, Ashish Verma

01-04-2021 | Issue 2/2021

### On the Local Leakage Resilience of Linear Secret Sharing Schemes

We consider the following basic question: to what extent are standard secret sharing schemes and protocols for secure multiparty computation that build on them resilient to leakage? We focus on a simple local leakage model, where the adversary can …

Authors:
Fabrice Benhamouda, Akshay Degwekar, Yuval Ishai, Tal Rabin

01-04-2021 | Original Article | Issue 2/2021

### Temporal conceptual model of contaminated complex sites applied for the management of a former supply well area in tropically weathered bedrock

Temporal Conceptual Model can enhance the long-term management of contaminated Complex Sites. This type of contaminated land model is defined here as the sequential or combined representation over time of single time conceptual models (named here …

Authors:
Sasha T. Hart, Reginaldo A. Bertolo, Maria S. Agostini, Roland Feig, Marcos B. Barbosa, Paulo L. Lima

01-04-2021 | Research Article | Issue 2/2021

### Hierarchical data replication strategy to improve performance in cloud computing

Cloud computing environment is getting more interesting as a new trend of data management. Data replication has been widely applied to improve data access in distributed systems such as Grid and Cloud. However, due to the finite storage capacity …

Authors:

01-04-2021 | Issue 1/2021

### Finite Element Method for Fractional Parabolic Integro-Differential Equations with Smooth and Nonsmooth Initial Data

We study the space-time finite element discretizations for time fractional parabolic integro-differential equations in a bounded convex polygonal domain in $${\mathbb {R}}^d (d=1,2,3)$$ R d ( d = 1 , 2 , 3 ) . Both spatially semidiscrete and fully …

Authors:
Shantiram Mahata, Rajen Kumar Sinha

01-04-2021 | Issue 1/2021

### Monomial Augmentation Guidelines for RBF-FD from Accuracy Versus Computational Time Perspective

Local meshless methods using RBFs augmented with monomials have become increasingly popular, due to the fact that they can be used to solve PDEs on scattered node sets in a dimension-independent way, with the ability to easily control the order of …

Authors:
Mitja Jančič, Jure Slak, Gregor Kosec

01-04-2021 | Issue 1/2021

### Implicit Multirate GARK Methods

This work considers multirate generalized-structure additively partitioned Runge–Kutta methods for solving stiff systems of ordinary differential equations with multiple time scales. These methods treat different partitions of the system with …

Authors:
Steven Roberts, John Loffeld, Arash Sarshar, Carol S. Woodward, Adrian Sandu

01-04-2021 | Issue 1/2021

### DeC and ADER: Similarities, Differences and a Unified Framework

In this paper, we demonstrate that the explicit ADER approach as it is used inter alia in Zanotti et al. (Comput Fluids 118:204–224, 2015) can be seen as a special interpretation of the deferred correction (DeC) method as introduced in Dutt et al.

Authors:
Maria Han Veiga, Philipp Öffner, Davide Torlo

01-04-2021 | Issue 1/2021

### IDENT: Identifying Differential Equations with Numerical Time Evolution

Identifying unknown differential equations from a given set of discrete time dependent data is a challenging problem. A small amount of noise can make the recovery unstable. Nonlinearity and varying coefficients add complexity to the problem. We …

Authors:
Sung Ha Kang, Wenjing Liao, Yingjie Liu

01-04-2021 | Issue 1/2021

### L1-Based Reduced Over Collocation and Hyper Reduction for Steady State and Time-Dependent Nonlinear Equations

The task of repeatedly solving parametrized partial differential equations (pPDEs) in optimization, control, or interactive applications makes it imperative to design highly efficient and equally accurate surrogate models. The reduced basis method …

Authors:
Yanlai Chen, Lijie Ji, Akil Narayan, Zhenli Xu

01-04-2021 | Issue 1/2021

### Bifidelity Data-Assisted Neural Networks in Nonintrusive Reduced-Order Modeling

In this paper, we present a new nonintrusive reduced basis method when a cheap low-fidelity model and an expensive high-fidelity model are available. The method employs proper orthogonal decomposition method to generate the high-fidelity reduced …

Authors:
Chuan Lu, Xueyu Zhu

01-04-2021 | Issue 2/2021

### Integrated Square Error of Hazard Rate Estimation for Survival Data with Missing Censoring Indicators

The problem of hazard rate estimation under right-censored assumption has been investigated extensively. Integrated square error (ISE) of estimation is one of the most widely accepted measurements of the global performance for nonparametric kernel …

Authors:
Yuye Zou, Guoliang Fan, Riquan Zhang

01-04-2021 | Original Article | Issue 2/2021

### A GIS-based approach to assess groundwater quality in Kurnool district

Water is essential for the survival of mankind on the surface of the Earth. The surface water bodies which act as a source of drinking water are prone to pollution in the current days. As a result people rely on groundwater sources for drinking …

Authors:
K. Tharani, P. Teja Abhilash

01-04-2021 | Original Article | Issue 1/2021

### Social Benefit Cost Analysis of Electric Bus Transit for Ahmedabad

This paper is an attempt to compute social benefit cost analysis (SBCA) for the proposed electric bus rapid transit system (e-BRTS) in Ahmedabad. Governments and urban local bodies in many countries including India are exploring the possibility of …

Authors:
Anal Sheth, Debasis Sarkar

01-04-2021 | Original Article | Issue 2/2021

### Groundwater resource assessment using different hydrological methods and GIS techniques for Central Part of Bengal Delta

Depiction of terrestrial water flux constituents in respect of geospatial distribution and consecutive disparity are important for water resources assessment. Due to the excessive and indiscriminate withdrawal of groundwater (GW), the water table …

Author:
Md Zakir Hossain

01-04-2021 | Issue 1/2021

### Optimal Energy Conserving Local Discontinuous Galerkin Methods for Elastodynamics: Semi and Fully Discrete Error Analysis

We present an arbitrary high-order local discontinuous Galerkin (LDG) method with alternating fluxes for solving linear elastodynamics problems in isotropic media. Both the semi-discrete analysis and fully discrete analysis for a leap-frog LDG …

Authors:
Ruchi Guo, Yulong Xing

01-04-2021 | Issue 1/2021

### Numerical Study of Low Rank Approximation Methods for Mechanics Data and Its Analysis

This paper proposes a comparison of the numerical aspect and efficiency of several low rank approximation techniques for multidimensional data, namely CPD, HOSVD, TT-SVD, RPOD, QTT-SVD and HT. This approach is different from the numerous papers …

Author:
Lucas Lestandi

01-04-2021 | Issue 1/2021

### Simple closed-form expressions for the effective properties of multilaminated flexoelectric composites

A multilayered rectangular flexoelectric structure is considered. This composite has a unit cell of N-constituents which belong to the cubic crystal symmetry. Using the two-scale asymptotic homogenization method, explicit expressions of the local …

Authors:
David Guinovart-Sanjuán, Kuppalapalle Vajravelu, Reinaldo Rodríguez-Ramos, Raúl Guinovart-Díaz, Federico J. Sabina, Jose Merodio

01-04-2021 | Issue 1/2021

### A class of transversely isotropic non-linear elastic bodies that is not Green elastic

An implicit constitutive relation is proposed to study transversely isotropic bodies. The relation is obtained assuming the existence of a Gibbs potential that depends on the second Piola–Kirchhoff stress tensor, from which the Green Saint-Venant …

Authors:
R. Bustamante, K. R. Rajagopal

01-03-2021 | Technical paper | Issue 1/2021

### Estimating unconfined compressive behavior of HMA using soft computing

The mechanical properties of materials such as elastic tangential modulus (Et) and unconfined compressive strength (UCS) can be used to predict their performance during service life. This paper utilizes gene expression programming (GEP) as an …

Authors:
Lee P. Leon, Indrajit Ray

01-03-2021 | Issue 1/2021

### Speckle Interferometric Investigation of Argon Pressure-Induced Surface Roughness Modifications in RF-Sputtered MoO3 Film

Film quality analysis is of more considerable significance due to its diversified applications in various fields of technology. The present work reports the speckle interferometric analysis of the argon pressure-induced surface roughness …

Authors:
S. Soumya, R. Arun Kumar, S. Sreejyothi, Vimal Raj, M. S. Swapna, S. Sankararaman

01-03-2021 | Issue 1/2021

### NDE 4.0—A Design Thinking Perspective

Cyber technologies are offering new horizons for quality control in manufacturing and safety assurance in-service of physical assets. The line between non-destructive evaluation (NDE) and Industry 4.0 is getting blurred since both are sensory …

Authors:
Johannes Vrana, Ripudaman Singh

01-03-2021 | Technical paper | Issue 1/2021

### Experimental, analytical and numerical performance of RC beams with V-shaped reinforcement

Nowadays the construction process is very much challenging and difficult for the civil engineers. The reinforced concrete (RC) is the most essential and extensively used material which possesses various important properties like compressive and …

Authors:

01-03-2021 | Technical paper | Issue 1/2021

### Experimental study of ground improvement by using encased stone columns

The application of stone columns increases the stiffness of soft soils which contributes to its load carrying capacity and accelerates the process of consolidation leading to reduction in settlement. However, under external loading, squeezing of …

Authors:
Ankit Thakur, Saurabh Rawat, Ashok Kumar Gupta

01-03-2021 | Issue 1/2021 Open Access

### Noise Reduction for Improvement of Ultrasonic Monitoring Using Coda Wave Interferometry on a Real Bridge

Reinforced concrete bridges are iconic parts of modern infrastructure. They are designed for a minimum service life of 100 years. However, environmental factors and/or inappropriate use might cause overload and accelerate the deterioration of …

Authors:
Xin Wang, Joyraj Chakraborty, Ernst Niederleithinger

01-03-2021 | Technical paper | Issue 1/2021

### Experimental and numerical modelling of group of geosynthetic-encased stone columns

The advantage of utilizing stone columns in very low bearing capacity of soil has been demonstrated as an effective strategy to improve the load bearing characteristics of soils. For stone columns, the load bearing capacity primarily relies upon …

Authors:
Ankit Thakur, Saurabh Rawat, Ashok Kumar Gupta

01-03-2021 | State-of-the-art paper | Issue 1/2021

### Comprehensive mechanical earth modeling using well data

Mechanical earth model is a numerical representation of the stress state, pore pressure and rock mechanical properties. While the different parameters in the MEM are interconnected in various ways, they fundamentally stem from the same basic set …

Authors:
Alireza Noohnejad, Kaveh Ahangari, Kamran Goshtasbi

01-03-2021 | Issue 1/2021

### The Formation of Microcracks in Water-Saturated Porous Ceramics During Freeze–Thaw Cycles Followed by Acoustic Emission

The acoustic emission (AE) technique was employed to monitor crack formation in the water-saturated ceramic material subjected to freeze–thaw cycles. The samples with water accessible porosity ranging from 6 to 50 vol% were prepared from the …

Authors:
Tomáš Húlan, Michal Knapek, Štefan Csáki, Jakub Kušnír, Jana Šmilauerová, Patrik Dobroň, František Chmelík, Tiit Kaljuvee, Mai Uibu

01-03-2021 | Technical paper | Issue 1/2021

### Effect of multi-faced twin tunneling in different depths on a single pile

In this paper, 3D modeling was performed to understand the effects of excavation of twin tunnel on a single pile in weathered residual soil. The effect of various tunnel depths on pile was evaluated in two cases of Z/Lp = 0.8 (tunnels near the …

Authors:

01-03-2021 | Issue 3/2021

### Planning and Monitoring Multi-Job Type Swarm Search and Service Missions

To transition from control theory to real applications, it is important to study missions such as Swarm Search and Service (SSS) where vehicles are not only required to search an area, but also service all jobs that they find. In SSS missions …

Authors:
Meghan Chandarana, Dana Hughes, Michael Lewis, Katia Sycara, Sebastian Scherer

01-03-2021 | Development | Issue 3/2021

### Air Tightness of Plastic-Metal Hybrid Structures for Cylinder Crankcases

Boundary layers between different materials in fluid-carrying housing structures must be designed to be media-tight. The Technische Universität Braunschweig and Volkswagen investigate the air tightness of thermoset and aluminum joints. Examplary …

Authors:
Birte von der Beeke, Joachim Sterz, Christine Schütz, Melanie Jauernick

01-03-2021 | In the Spotlight | Issue 3/2021

### The Car as an Energy Storage System

Mobility in Germany is undergoing a period of disruptive change with the move toward electrification, hydrogen and synthetic carbon-neutral fuels. Most people are familiar with these developments, but fewer are aware that electric cars can help to …

Author:
Susanne Roeder

01-03-2021 | Issue 1/2021

### Energy Refining Balance with Ant Colony System for Cloud Placement Machines

Cloud computing has been one of significant domains of processing service in social networks like the internet and local networks in recent years. One of the main problems in cloud computing is placing a virtual server onto physical servers. This …

Authors:
Hamed Tabrizchi, Marjan Kuchaki Rafsanjani

01-03-2021 | Issue 3/2021

### Locking-Free and Gradient-Robust -Conforming HDG Methods for Linear Elasticity

Robust discretization methods for (nearly-incompressible) linear elasticity are free of volume-locking and gradient-robust. While volume-locking is a well-known problem that can be dealt with in many different discretization approaches, the …

Authors:
Guosheng Fu, Christoph Lehrenfeld, Alexander Linke, Timo Streckenbach

01-03-2021 | Issue 3/2021 Open Access

### Asymptotic Behaviour of Time Stepping Methods for Phase Field Models

Adaptive time stepping methods for metastable dynamics of the Allen–Cahn and Cahn–Hilliard equations are investigated in the spatially continuous, semi-discrete setting. We analyse the performance of a number of first and second order methods …

Authors:
Xinyu Cheng, Dong Li, Keith Promislow, Brian Wetton

01-03-2021 | Issue 3/2021

### Weak Convergence Rates for an Explicit Full-Discretization of Stochastic Allen–Cahn Equation with Additive Noise

We discretize the stochastic Allen–Cahn equation with additive noise by means of a spectral Galerkin method in space and a tamed version of the exponential Euler method in time. The resulting error bounds are analyzed for the spatio-temporal full …

Authors:
Meng Cai, Siqing Gan, Xiaojie Wang

01-03-2021 | Issue 3/2021 Open Access

### A Posteriori Subcell Finite Volume Limiter for General Schemes: Applications from Gasdynamics to Relativistic Magnetohydrodynamics

In this work, we consider the general family of the so called ADER $$P_NP_M$$ P N P M schemes for the numerical solution of hyperbolic partial differential equations with arbitrary high order of accuracy in space and time. The family of one-step …

Authors:
Elena Gaburro, Michael Dumbser

01-03-2021 | Issue 3/2021

### Abundant closed-form solitons for time-fractional integro–differential equation in fluid dynamics

In this paper, with the aid of the Mathematica package, several classes of exact analytical solutions for the time-fractional $$(2+1)$$ ( 2 + 1 ) -dimensional Ito equation are obtained. To analytically tackle the above equation, the Kudryashov …

Authors:
Emad A. Az-Zo’bi, Wael A. AlZoubi, Lanre Akinyemi, Mehmet Şenol, Islam W. Alsaraireh, Mustafa Mamat

01-03-2021 | Issue 1/2021

### Numerical evaluation of Mittag-Leffler functions

The Mittag-Leffler function is computed via a quadrature approximation of a contour integral representation. We compare results for parabolic and hyperbolic contours, and give special attention to evaluation on the real line. The main point of …

Author:
William McLean

01-03-2021 | Issue 1/2021

The challenges presented by the global pandemic and slump in oil prices have imposed costly avoidance measures and delayed project timeliness, but it also has created the opportunity for innovation conditions in industrial non-destructive testing.

Authors:
Hossain Saboonchi, Donald Blanchette, Kimberley Hayes

01-03-2021 | Issue 1/2021

### Opportunistic Deployment of Distributed Edge Clouds for Latency-Critical Applications

The growing number of latency-critical applications are posing novel challenges for network operators, cloud/hosting companies, and application providers. Edge Computing is the strongest candidate for providing low-latency responses, but it is not …

Authors:
Eduardo Huedo, Rubén S. Montero, Rafael Moreno-Vozmediano, Constantino Vázquez, Vlastimil Holer, Ignacio M. Llorente

01-03-2021 | ORIGINAL PAPER | Issue 3/2021

### Preparation of floating polymer-valsartan delivery systems using supercritical CO2

This study investigates pharmaceutical polymers (Soluplus®, HPMCAS, and Eudragit® E100) and supercritical CO2-assisted process for preparation of floating valsartan delivery systems. Tested process (at pressure of 30 MPa and temperature of 100 °C …

Authors:
Stoja Milovanovic, Jelena Djuris, Aleksandra Dapčević, Marija Lucic Skoric, Djordje Medarevic, Stefan M. Pavlović, Svetlana Ibric

01-03-2021 | ORIGINAL PAPER | Issue 3/2021

### Improvement in physico-mechanical and structural properties of rigid polyurethane foam composites by the addition of sugar beet pulp as a reactive filler

Green polymeric composites, which are obtained from cheap, renewable, and environmentally friendly natural resources that can replace petrochemicals, have gained great attention from the researchers in recent years. To that end, we aimed at …

Authors:
Emre Akdogan, Murat Erdem

01-03-2021 | Issue 3/2021

### Coherence combination to create a long depth bifocal diffractive lens capable of generating tailorable biannular and bottle beam

Herein, the coherence combination is simply the sum of two or more diffractive elements to achieve a novel diffractive element with its unique behavior. Concerning this concept, we aim to demonstrate how a long-depth bifocal diffractive lens is …

Authors:
Fatemeh Seifi, Arash Sabatyan

01-03-2021 | Original Paper | Issue 1/2021 Open Access

### Elastic Contacts of Randomly Rough Indenters with Thin Sheets, Membranes Under Tension, Half Spaces, and Beyond

Mechanical contacts between nominally flat surfaces occur everywhere. Due to the microscopic roughness on most surfaces, real contact is only made in isolated, load-bearing patches in the interface, where local compressive stresses can exceed the …

Author:
Martin H. Müser

01-03-2021 | In the Spotlight | Issue 3/2021

### The Car as an Energy Storage System

Mobility in Germany is undergoing a period of disruptive change with the move toward electrification, hydrogen and synthetic carbon-neutral fuels. Most people are familiar with these developments, but fewer are aware that electric cars can help to …

Author:
Susanne Roeder

01-03-2021 | Cover Story | Issue 3/2021

### "We can reduce carbon emissions by using sustainable aluminum"

The development of aluminum application technologies is a continuous engineering process to minimize carbon footprint and passenger car weight. Seiichi Hirano, Member of the Board of the UACJ Corporation, a Japanese aluminum components supplier …

Author:
Michael Reichenbach

26-02-2021 | Tunnel Engineering

### The Split-Permeation Grouting Mechanism of Loose and Broken Coal Rock Masses considering the Temporal and Spatial Characteristics of Slurry Viscosity

Quick-setting grout has time-varying characteristics, and the space porosity of the injected medium changes after being grouted. The above two points need to be considered when loose and broken coal rock masses are grouted with rapid-setting …

Authors:
Hexuan Zhu, Lijun Han, Qingbin Meng, Jun Liu, Lingdong Meng, Wenlong Dong

26-02-2021 | Geotechnical Engineering

### Experimental Study on Key Parameters of Bidirectional Cumulative Tensile Blasting with Coal-Containing Composite Roof

To improve the effectiveness of the directional-predetermined crack blasting in the weak and alternate composite roof, this paper took the coal-containing composite roof of the 12201 working face of Halagou Coal Mine as the engineering background …

Authors:
Pengfei Gue, Kengkeng Ye, Zhigang Tao, Hongda Liang, Yadi Yuan

25-02-2021 | Original Article

### Tri-functionalized polypropylene separator by rGO/MoO2 composite for high-performance lithium–sulfur batteries

With the rapid evolution of electric vehicles and smart grids, the demand of high energy density storage devices is growing in modern society. Lithium-ion (Li-ion) batteries cannot meet the demand due to their energy density limitations.

Authors:
Kun Xu, Xin Liang, Lu-Lu Wang, Yong Wang, Ju-Feng Yun, Yi Sun, Hong-Fa Xiang

25-02-2021 | Special Issue Paper

### Low-complexity fake face detection based on forensic similarity

In recent years, face synthesis and manipulation technology have been developed rapidly, and now it is feasible to synthesize extremely realistic fake face videos, which can easily deceive existing face recognition systems. Due to the high quality …

Authors:
Zhaoguang Pan, Yanli Ren, Xinpeng Zhang

25-02-2021 | Ceramics Open Access

### Fundamental material property trends in the La0.8-xNdxCa0.2FeO3-δ series: crystal structure and thermal expansion

Compounds from the series La0.8-xNdxCa0.2FeO3-δ (0.1 ≤ x ≤ 0.7) were synthesised by a sol–gel route. X-ray diffraction and Rietveld analysis showed that materials with 0 ≤ x ≤ 0.6 crystallize as single-phase orthorhombic perovskites. The smaller …

Authors:
Christian Berger, Edith Bucher, Judith Lammer, Christina Nader, Werner Sitte

25-02-2021 | Electronic materials

### Fracture mechanism of microporous Ag-sintered joint in a GaN power device with Ti/Ag and Ni/Ti/Ag metallization layer at different thermo-mechanical stresses

Ag sinter joining technology is emerging as a die attach material for next-generation power modules in high-temperature applications. Thermal shock test has revealed that the fracture characteristics and reliability of sintered Ag joint were …

Authors:
Dongjin Kim, Sangmin Lee, Chuantong Chen, Seung-Joon Lee, Shijo Nagao, Katsuaki Suganuma

25-02-2021 Open Access

### Information measures and design issues in the study of mortality deceleration: findings for the gamma-Gompertz model

Mortality deceleration, or the slowing down of death rates at old ages, has been repeatedly investigated, but empirical studies of this phenomenon have produced mixed results. The scarcity of observations at the oldest ages complicates the …

Authors:
Marie Böhnstedt, Jutta Gampe, Hein Putter

25-02-2021 | Original Article Open Access

### Unsupervised detection of botnet activities using frequent pattern tree mining

A botnet is a network of remotely-controlled infected computers that can send spam, spread viruses, or stage denial-of-service attacks, without the consent of the computer owners. Since the beginning of the 21st century, botnet activities have …

Authors:
Siqiang Hao, Di Liu, Simone Baldi, Wenwu Yu

25-02-2021

### Investigating Shrinkage: CAD, Thermal and Volumetric for Selective Laser Sintering of Polyamide Parts

Selective laser sintering (SLS) is an additive manufacturing (AM) process, which is widely used for fabrication of end used products, directly from computer aided design (CAD) data. SLS process is usually used in different areas such as …

Authors:
Vishal Sharma, Ramesh Chand, Vishal S Sharma, Anish Sachdeva, Sharanjit Singh

24-02-2021 | Research Article Open Access

### Synthesis of nearly spherical AlN particles by an in-situ nitriding combustion route

Spherical AlN powders with micrometer size have attracted great attention owing to their good fluidity and dispersity. However, the industrial preparation methods usually require high temperature and long soaking time, which lead to the high cost …

Authors:
Zhilei Wei, Kang Li, Bangzhi Ge, Chaowei Guo, Hongyan Xia, Yajie Guo, Zhongqi Shi

24-02-2021 | Research Article

### Numerical studies on swirling of internal fire whirls with experimental justifications

Numerical studies on internal fire whirls (IFW) generated in a vertical shaft model with a single corner gap were reported in this paper. The generation of IFW, burning rate of fuel and temperature were studied experimentally first. Numerical …

Authors:
Zheming Gao, S. S. Li, Y. Gao, H. Y. Hung, Wan-ki Chow

24-02-2021 | Electronic materials

### Facile preparation of aluminum nitride decorated multi-walled carbon nanotube for excellent microwave absorption

Due to the development of anti-electronics devices, network technologies and small-scale communication equipment, much attention has been focused on microwave absorbing materials to solve the growing problems of electromagnetic interference and …

Authors:
Wei Ma, Rui Yang, Hai Xie, Tingmei Wang

24-02-2021 | Metals & corrosion

### Uncovering the influence of Cu on the thickening and strength of the δ′/θ′/δ′ nano-composite precipitate in Al–Cu–Li alloys

Nanoscale δ′/θ′/δ′ composite precipitate, as another important strengthening phase in the latest generation of Al–Li alloys, exhibits excellent resistance to coarsening. Here, we propose two thickening models for an anomalous δ′/θ′/δ′ that is …

Authors:
Shuo Wang, Chi Zhang, Xin Li, Junsheng Wang

24-02-2021 | Energy materials

### Anchored CoCO3 on peeled graphite sheets toward high-capacity lithium-ion battery anode

Transition metal carbonates are attracting significant interests as lithium-ion batteries (LIBs) anode due to their high specific capacity and initial Coulombic efficiency. However, the internal poor conductivity and volume variation hinder their …

Authors:
Guocui Xi, Xun Jiao, Qimeng Peng, Tianbiao Zeng

24-02-2021 | Energy materials

### Ultra-high capacity dual-ion batteries realized by few-layered reduced graphene oxide and cathode structure design

As the development of dual-ion batteries (DIBs) is limited by the capacity of anions intercalation, we put forward an innovative design idea of DIB. Compared with the traditional graphite cathodes, few-layered reduced graphene oxide (rGO) has a …

Authors:
Xiao Qi, Fei Wang, Hongtao Xie, Limin Mao, Jian Mao

24-02-2021 | Original Paper

### Partitioning of nitrogen atoms and its effect on retained austenite content in an ultra-low-carbon Cr–Mn–N stainless steel

The partitioning of nitrogen atoms and its effect on the retained austenite content (RAC) during quenching and partitioning (Q&P) process were investigated by dilatometry, X-ray diffraction, and field emission transmission electron microscopy with …

Authors:
Zhe Zhu, Wan-tang Fu, Rong-bin Li, Qi-wei Chen, Ze-an Zhou, Zhen-hua Wang, Jia-qing Liu, Shu-hua Sun

24-02-2021 | Original Article

### Photothermal-controlled sustainable degradation of protective coating modified Mg alloy using near-infrared light

Because of their low density, inherent biocompatibility and sufficient mechanical properties, magnesium (Mg) and its alloys are exhibiting great potential in biomedical engineering [ 1 – 4 ]. For a healthy person, Mg is a basic trace element and …

Authors:
Zhi-Xin Han, Xiang-Mei Liu, Lei Tan, Zhao-Yang Li, Yu-Feng Zheng, Kelvin Wai-Kwok Yeung, Zhen-Duo Cui, Yan-Qin Liang, Sheng-Li Zhu, Shui-Lin Wu

24-02-2021 | Original Research Article

### Numerical Analysis of the Particle Dynamics in a Supersonic Gas Stream with a Modified Point-Particle Euler–Lagrange Approach

Numerical simulations of a gas-particle jet through a Laval nozzle are performed using a modified point-particle Euler–Lagrange approach. By excluding the particle-occupied fluid fraction when solving the fluid phase equations and accounting for …

Authors:
Mingming Li, Lin Li, Lei Shao, Qiang Li, Zongshu Zou, Baokuan Li

24-02-2021 Open Access

### More than Meets the Eye: Understanding Perceptions of China Beyond the Favorable–Unfavorable Dichotomy

How is China viewed by citizens of other countries? Popular polling data based on the feeling thermometer scale can reveal overall patterns of public sentiment toward China, but they do not necessarily capture the multidimensional preferences of …

Author:
Xiaojun Li

24-02-2021 | Original Research Article

### Experimental Investigation of Allotropic Transformation of Cobalt: Influence of Temperature Cycle, Mechanical Loading and Starting Microstructure

Mechanical properties of metallic materials, such as high-purity cobalt, are directly linked to crystallographic phase structures and microstructure defect presence. The mechanical behavior of two-phase cobalt remains unclear when the phase …

Authors:
Nadjib Iskounen, Pierre-Antoine Dubos, Jamal Fajoui, Michel Coret, Marie-José Moya, Baptiste Girault, Nicolas Barrier, Nicolas Bruzy, Eric Hug, David Gloaguen

24-02-2021 | Research Article

### To Engage or Not to Engage? Explaining the Logic of the US’s China Strategy in the Post-Cold War Era

The United States’ (US) changing policy towards China has become one of the most attractive issues in contemporary international politics. To explore the reasons underlying these changes, existing studies adopt four schools of explanation, i.e. …

Author:
Xiaodi Ye

24-02-2021

### Electrochemical exfoliation of molybdenum disulfide nanosheets for high-performance supercapacitors

Two-dimensional (2D) molybdenum disulfide (MoS2) nanomaterials have emerged as promising candidates for constructing excellent supercapacitors, but the lack of large-scale, efficient and low-cost methods for preparing MoS2 nanosheets severely …

Authors:
Rong Hu, Zongyu Huang, Bo Wang, Hui Qiao, Xiang Qi

24-02-2021

### A study on the oxidation and electrical behavior of crofer 22 APU solid oxide fuel cell interconnects with Ni-Co-CeO2 composite coating

A protective/conductive coating can be used to limit the formation of chromia in ferritic steel interconnects in solid oxide fuel cells (SOFCs). One of the most promising candidates for restricting chromia formation is the addition of reactive …

Authors:

24-02-2021

### Mn-doped (Bi0.5Na0.5) TiO3 thin film with low leakage current density and high ferroelectric performance

The films of (Bi0.5Na0.5)(Ti1-xMnx)O3-δ (BNTMx) were deposited on the substrates via the sol–gel method. The influence of the doping content of Mn on the microstructures and ferroelectric properties of the films were investigated. In addition, the …

Authors:
Min Shi, Zhuolin Si, Enyang Men, Zheng Zhao, Yudong Xu, Ruzhong Zuo, Li Guo, Kunzhuang Hu

24-02-2021 | Original Research

### Isolation and rheological characterization of cellulose nanofibrils (CNFs) produced by microfluidic homogenization, ball-milling, grinding and refining

The aim of this work is to study and compare the morphology and rheology of cellulose nanofibrils (CNFs) from bleached softwood kraft pulp by several mechanical treatment methods. Three different kinds of CNFs were prepared in this work: (i) ones …

Authors:
Jinsong Zeng, Fugang Hu, Zheng Cheng, Bin Wang, Kefu Chen

24-02-2021 | Original Paper

### The Regulatory Dynamics of Sustainable Finance: Paradoxical Success and Limitations of EU Reforms

The financial sector has seen a transformation towards ‘sustainable’ finance particularly in Europe, driven also by unprecedented regulatory reforms. At the same time, many are sceptical about the real impact of these reforms, fearing that they …

Authors:
Hanna Ahlström, David Monciardini

24-02-2021

### Feature selection methods for text classification: a systematic literature review

Feature Selection (FS) methods alleviate key problems in classification procedures as they are used to improve classification accuracy, reduce data dimensionality, and remove irrelevant data. FS methods have received a great deal of attention from …

Authors:
Julliano Trindade Pintas, Leandro A. F. Fernandes, Ana Cristina Bicharra Garcia

24-02-2021 | Original Paper

### Combined Effects of Thermal Perturbation and In-situ Stress on Heat Transfer in Fractured Geothermal Reservoirs

We develop a new fully coupled thermo-hydro-mechanical (THM) model to investigate the combined effects of thermal perturbation and in-situ stress on heat transfer in two-dimensional fractured rocks. We quantitatively analyze the influence of …

Authors:
Zhixue Sun, Chuanyin Jiang, Xiaoguang Wang, Wen Zhou, Qinghua Lei

24-02-2021 | Original Paper

### Experimental Verifications and Applications of 3D-DDA in Movement Characteristics and Disaster Processes of Rockfalls

Rockfalls are a major hazard in mountain areas and along engineering slopes. It is important to fully understand the characteristics and processes of rockfall movements, both for hazard assessment and countermeasure design. This study focused on …

Authors:
Guoyang Liu, Junjie Li, Zhuangzhuang Wang

24-02-2021 | Original Paper Open Access

### High-order conservative formulation of viscous terms for variable viscosity flows

The work presents a general strategy to design high-order conservative co-located finite-difference approximations of viscous/diffusion terms for flows featuring extreme variations of diffusive properties. The proposed scheme becomes equivalent to …

Authors:
Francesco De Vanna, Alberto Benato, Francesco Picano, Ernesto Benini

24-02-2021 | ORIGINAL ARTICLE

### Study on the machining characteristics of high-efficiency mixed gas atomized discharge ablation process of titanium alloy

Titanium alloy is widely used in aerospace and other industry fields because of its excellent physical and chemical properties. However, the fabrication process is still a challenge for the traditional machining processes due to the ultra hardness …

Authors:
Linglei Kong, Zhidong Liu, Xiangzhi Wang, Mingbo Qiu

24-02-2021 | ORIGINAL ARTICLE

### Numerical and experimental study on the deformation of aluminum alloy ring treated by ultrasonic shot peen forming

Ultrasonic shot peen forming (USPF) is a promising and widely used forming technique for thin metallic parts. In this paper, detailed deformation behavior of the aluminum alloy ring caused by USPF was studied, which is of a great significance to …

Authors:
Qinglong Zhang, Hao Li, Menggang Zhai, Aziz Ul Hassan Mohsan, Su Zhao

24-02-2021

### Numerical and Experimental Study of the Effects of Surface Temperature and Oxygen Mass Flux on the Ablation of Carbon–Carbon Composites

The ablation performance of carbon–carbon composites depends on the environment in which the ablation occurs. At temperatures below 3000 $$K$$ K , the ablation performance of carbon–carbon composites is determined by oxidation, and so it is not …

Authors:
Sanghoon Lee, Jerin John, Gisu Park, Jae Gang Kim

24-02-2021 | Original Article / Originalbeitrag

### Effect of Drought Stress and Different Levels of Nitrogen and Potassium Fertilizers on the Accumulation of Osmolytes and Chlorophyll in Rice (Oryza sativa L.)

Management of plant nutrition using fertilizers is an approach to deal with drought and to increase water productivity in paddies. The aim of this study, therefore, was to investigate the effects of nitrogen and potassium fertilizers and drought …

Authors:
Zahra Rabiei, Naser Mohammadian Roshan, Seyyed Mostafa Sadeghi, Ebrahim Amiri, Hamid Reza Doroudian

23-02-2021

### Effect of Combined Tempering and Aging in the Austenite Reversion, Precipitation, and Tensile Properties of an Additively Manufactured Maraging 300 Steel

Maraging 300 is an ultrahigh strength steel with significant alloy addition, resulting in a martensitic matrix hardened by precipitation through aging treatment. In these steels, intercritical tempering can provide reverted austenite and …

Authors:
Fábio Faria Conde, Julian David Escobar, Johnnatan Rodriguez, Conrado Ramos Moreira Afonso, Marcelo Falcão Oliveira, Julian Arnaldo Avila

23-02-2021

### Preparation and Tribological Properties of Graphene Oxide/Polydopamine-Derived Carbon Films on Silicon Substrate

In this study, dopamine and graphene oxide (GO) solutions were spin-coated on the silicon wafers to obtain the GO/polydopamine (PDA) films. The carbon films were subsequently fabricated by annealing the GO/PDA films in argon atmosphere. The atomic …

Authors:
Chao Zang, Ming Yang, Zhengfeng Jia, Jing Zhang, Jinlong Jiang, Wei Li, Changhua Su, Ran Zhang

23-02-2021 | Original Paper

### Ant-gardens: a specialized ant-epiphyte mutualism capable of facing the effects of climate change

It is suggested that specialized mutualisms are more vulnerable to climate change. Ant-gardens (AGs) are a complex and specialized mutualistic system represented by epiphytic plants that specifically inhabit the arboreal nest built by canopy ants …

Authors:
Jonas Morales-Linares, Angélica María Corona-López, Víctor Hugo Toledo-Hernández, Alejandro Flores-Palacios

23-02-2021 | Theoretical / Philosophical Paper Open Access

### “Alexa, who am I?”: Voice Assistants and Hermeneutic Lemniscate as the Technologically Mediated Sense-Making

In this paper, I argue that AI-powered voice assistants, just as all technologies, actively mediate our interpretative structures, including values. I show this by explaining the productive role of technologies in the way people make sense of …

Author:
Olya Kudina

23-02-2021 | Regular Article

### Preying on beauty? The complex social dynamics of overtourism

Overtourism is an increasingly relevant problem for tourist destinations, and some cities are starting to take extreme measures to counter it. In this paper, we introduce a simple mathematical model that analyzes the dynamics of the populations of …

Authors:
Angelo Antoci, Paolo Russu, Pier Luigi Sacco, Giorgio Tavano Blessi

23-02-2021 | Electronic materials

### Effects of chromium/fluorine co-doping on the electrochemical performance of Li1.2Ni0.13Co0.13Mn0.54O2 cathode material for lithium-ion batteries

With increasing demand for hybrid electric vehicles (HEVs) and electric vehicles (EVs) demand in daily life, the lithium ion batteries (LIBs) are considered as the promising candidates to resolve urgent demands for clean, renewable energy[ 1 , 2 ]; …

Authors:
Xinping Huang, Zhengyu Zhang, Jielong He, Zhe Bai, Lu Lu, Jun Li

23-02-2021

### Validity of Methods for Analytically Solving the Governing Equation of Smoke Filling in Enclosures with Floor Leaks and Growing Fires

The main objective of this paper is to evaluate the validity of the existing methods for analytically solving the governing equation of smoke filling in enclosures with floor leaks and growing fires. Since the complete form of the governing …

Authors:
Yan Zhou, Qian Meng

23-02-2021 | Research Article Open Access

### Identification of model uncertainty via optimal design of experiments applied to a mechanical press

In engineering applications almost all processes are described with the help of models. Especially forming machines heavily rely on mathematical models for control and condition monitoring. Inaccuracies during the modeling, manufacturing and …

Authors:
Tristan Gally, Peter Groche, Florian Hoppe, Anja Kuttich, Alexander Matei, Marc E. Pfetsch, Martin Rakowitsch, Stefan Ulbrich

23-02-2021

### Synthesis of highly porous activated carbon nanofibers derived from bamboo waste materials for application in supercapacitor

Sample activated carbon electrodes sourced from bamboo materials are synthesized using a combination of chemical and physical activation and applied in the production of supercapacitor cells. This study, therefore, focuses on the carbonization …

Authors:
Rakhmawati Farma, Aldila Putri, Erman Taer, Awitdrus Awitdrus, Apriwandi Apriwandi

23-02-2021 | Original Paper

### Moral Reactions to Bribery are Fundamentally Different for Managers Witnessing and Managers Committing Such Acts: Tests of Cognitive-Emotional Explanations of Bribery

We investigate how paying a bribe or refusing a bribe differs between observing others doing this or committing such acts oneself. Study 1 examines how and when observing others paying a bribe or refusing a bribe leads to actions opposing bribery …

Authors:
Ekta Sharma, Richard P. Bagozzi

23-02-2021

### Green Fabrication of Polyimide Fibers with Phosphate Monoester Network to Reinforce Carbon Nanotube Polymer Composites: Simultaneously improving the Mechanical Properties and Flame Retardancy

To further enhance the reinforcing effect of polyimide (PI) fibers on carbon nanotube polymer composites, in this work, networks of long chains of phosphate monoester (PMOEs) were grown on the surface of PI fibers, and silanized multiwalled carbon …

Authors:
Hongyang Dang, Yunfeng Cao, Ruqiang Zhang, Zhu Long, Shuai Guo, Shihua Wang, Zhiqiang Li

23-02-2021 | Originalarbeit Open Access

### Incremental holistic controller

The trace of inverse coefficient matrix method in state space is used to implement and simplify an iterative design of a control system with main interest in increasing dynamical performance quality or to check if stability danger exists. The τ …

Author:
Alexander Weinmann

23-02-2021 | Regular Paper

### Cleaning timestamps with temporal constraints

Timestamps are often found to be dirty in various scenarios, e.g., in distributed systems with clock synchronization problems or unreliable RFID readers. Without cleaning the imprecise timestamps, temporal-related applications such as provenance …

Authors:
Shaoxu Song, Ruihong Huang, Yue Cao, Jianmin Wang

23-02-2021 | ORIGINAL ARTICLE

### Effect of laser powder bed fusion parameters on the microstructural evolution and hardness of 316L stainless steel

In this study, parts were fabricated using variations of laser power, scanning speed, and hatch spacing (volumetric energy density (VED)) to understand the effect of processing parameters on the structure and properties of 316L stainless steel. It …

Authors:
Ali Eliasu, Aleksander Czekanski, Solomon Boakye-Yiadom

23-02-2021 | Original

### Utilization of splitting strips in fracture mechanics tests of quasi-brittle materials

In this study, utilizing the boundary collocation approach based on the generalized Westergaard formulation developed by Sanford, alternative splitting strips with various ratios of length/depth, L/h = 0.5, 0.75, 1.25, and 1.5, were first …

Author:
Ragip Ince

23-02-2021 | Original

### Vibration and thermal buckling analyses of multi-span composite lattice sandwich beams

Multi-span composite lattice sandwich beams have wide application prospects in the aerospace, high-speed trains and civil engineering fields because of the low specific weight, high specific strength and multifunctional potential. Moreover, the …

Authors:
Lanxiang Liu, Wenying Yang, Yuyang Chai, Guofu Zhai

23-02-2021 | Methodologies and Application

### Multi-UAV reconnaissance task allocation for heterogeneous targets using grouping ant colony optimization algorithm

The study on multiple unmanned aerial vehicles (UAVs) reconnaissance task allocation problem is an important research field, which is significant for both military and civilian applications. This problem has often been considered as a multiple …

Authors:
Sheng Gao, Jiazheng Wu, Jianliang Ai

23-02-2021 | Original Paper

### Effects of single lance configuration on coal combustion process in tuyere from viewpoint of coal plume

Pulverized coal utilization in the blast furnace is decided by the particle flow and combustion behaviors in the raceway. Under a specific operating condition, these behaviors are directly related to the lance configuration in the upstream tuyere …

Authors:
Yun-hua Zhou, Ping Zhou, Jia-yun Dan, Hong-jie Yan, Dong-ling Wu

23-02-2021

### Ensembling of text and images using Deep Convolutional Neural Networks for Intelligent Information Retrieval

Information retrieval (IR) defines the process of searching and attaining specific information resources which are related to the specific information requirements from the available resource pool. It finds useful in several real time application …

Authors:
P. Mahalakshmi, N. Sabiyath Fatima

23-02-2021

### Information Iterative Retrieval of Internet of Things Communication Terminal Based on Symmetric Algorithm

Through improved similarity analysis algorithm and hybrid local sensitivity hashing method, information is summarized and retrieved by information retrieval method based on EPC network architecture. This method does not consider the symmetry of …

Author:
Min Zhao

23-02-2021

### Understanding the effects of travel demand management on metro commuters’ behavioural loyalty: a hybrid choice modelling approach

As part of efforts to promote sustainable mobility, many cities are currently experiencing the rapid expansion of their metro network. The consequent growth in ridership motivates a broad range of travel demand management (TDM) policies, both in …

Authors:
Ning Huan, Stephane Hess, Enjian Yao

23-02-2021 | Original Article Open Access

### Stance detection using improved whale optimization algorithm

News is a medium that notifies people about the events that had happened worldwide. The menace of fake news on online platforms is on the rise which may lead to unwanted events. The majority of fake news is spread through social media platforms …

Authors:
Avinash Chandra Pandey, Vinay Anand Tikkiwal

22-02-2021

### Reproductive patterns of solitary cavity-nesting bees responsive to both local and landscape factors

Understanding how local and landscape-level factors influence species abundances and distributions is crucial for conservation and restoration efforts. Effects of urbanization are often negative at a landscape level, but some taxa such as solitary …

Authors:
Aaron N. Sexton, Sarah Benton, Adam C. Browning, Sarah M. Emery

22-02-2021 | Original Research Article Open Access

### In-Situ Synchrotron X-ray Diffraction Investigation of Microstructural Evolutions During Low-Pressure Carburizing

An experimental heat treatment chamber and control system were developed to perform in-situ X-ray diffraction experiments during low-pressure carburizing (LPC) processes. Results from the experimental chamber and industrial furnace were compared …

Authors:
Ogün Baris Tapar, Jérémy Epp, Matthias Steinbacher, Jens Gibmeier

22-02-2021 | Composites & nanocomposites Open Access

### Phase-contrast and dark-field imaging for the inspection of resin-rich areas and fiber orientation in non-crimp vacuum infusion carbon-fiber-reinforced polymers

In this work, we present a multimodal approach to three-dimensionally quantify and visualize fiber orientation and resin-rich areas in carbon-fiber-reinforced polymers manufactured by vacuum infusion. Three complementary image modalities were …

Authors:
Jonathan Glinz, Jan Šleichrt, Daniel Kytýř, Santhosh Ayalur-Karunakaran, Simon Zabler, Johann Kastner, Sascha Senck

22-02-2021 | FUNDAMENTAL PROBLEMS IN METROLOGY

### Cosmological Distance Scale. Part 10. Universal Anisotropy

A brief overview of the history of the origin and development of the cosmological distance scale based on redshift is given. Statistical aspects of the problem of calibration of scales of this type are considered on the analogy with the problems …

Author:
S. F. Levin

22-02-2021

### Effect of the degree of supercooling on growth mechanism of Cu6Sn5 in pure Sn/Cu solder joint

The growth mechanism of Cu6Sn5 intermetallic compound (IMC) at Sn/Cu interface reflowed under 250 °C, 275 °C, and 300 °C for a duration of 60 s and undergoing highly pressurized air action (HP), water cooling (WC), air cooling (AC) or furnace …

Authors:
Bingfeng Guo, Haitao Ma, Anil Kunwar, Xinhong Chu

22-02-2021

### Effect of Ti underlayer thickness on the magnetic anisotropy of TbFe thin films

In this study, we address the impact of Ti underlayer thickness (UL: 0-40 nm) on the structural, magnetic, and microscopic properties of TbFe thin films. The structural analysis confirmed the intermixing at interfaces of the Ti and TbFe layer with …

Authors:
Ajit Kumar Sahoo, J. Arout Chelvane, J. Mohanty

22-02-2021

### Optical and room-temperature ferromagnetic properties of Ni-doped CuO nanocrystals prepared via auto-combustion method

The pure and Ni-doped CuO nanocrystals were prepared via auto-combustion method and characterized by X-ray diffraction, scanning electron microscope, UV spectroscopy, and vibrating sample magnetometer method. The X-ray diffraction patterns of all …

Authors:
S. P. Kamble, V. D. Mote

22-02-2021

### Electrochemical performance of SnO2 rods and SnO2/rGO, SnO2/MWCNTs composite materials as an anode for lithium-ion battery application-A comparative study

Surfactant and organic solvents-based SnO2 rods and SnO2/rGO, SnO2/MWCNTs composite materials were synthesized by microwave-assisted hydrothermal process. Powder X-ray diffraction analysis revealed the rutile phase formation. Surface morphology of …

Authors:
Paramananda Jena, Nibagani Naresh, N. Satyanarayana, Pankaj Kumar Patro, R. Biswal, M. C. Adhikary

22-02-2021 | Original Article

### New perspectives for modelling ballistic-diffusive heat conduction

Among the three heat conduction modes (diffusive, second sound, and ballistic propagation), the ballistic one is the most difficult to model. In the present paper, we discuss its physical interpretations and show different alternatives to its …

Authors:
G. Balassa, P. Rogolino, Á. Rieth, R. Kovács

22-02-2021 | Original Article

### A constitutive model for linear hyperelastic materials with orthotropic inclusions by use of quaternions

An approximated theoretical model for linear hyperelastic materials with orthotropic inclusions is presented based on a mixture approach and orientation averaging of mechanical properties. In many modern composites, particle inclusions are used to …

Author:
Heiko Herrmann

22-02-2021 | Original Paper

### Explicit expression of stationary response probability density for nonlinear stochastic systems

Identifying the exactly or approximately explicit expression of the stationary response probability density for general nonlinear stochastic dynamical systems is of great significance in the fields of stochastic dynamics and control. Almost all …

Authors:
Xiaoling Jin, Yanping Tian, Yong Wang, Zhilong Huang

22-02-2021 | Original Paper

### Critical dynamics of damage-failure transition in wide range of load intensity

The self-similarity of characteristic stages of damage-failure transition has been studied both theoretically and experimentally, with the damage localization kinetics analyzed according to the nonlinearity of free energy release of solids with …

Authors:
O. Naimark, Yu. Bayandin, S. Uvarov, I. Bannikova, N. Saveleva

22-02-2021 | Original Paper

### Analysis of a curved Timoshenko nano-beam with flexoelectricity

A Timoshenko beam model is applied for the analysis of the flexoelectric effect for a curved nano-beam. This theory transforms the beam to a 1-d problem along the beam axis. The electric intensity vector for the open-circuit condition can be …

Authors:

22-02-2021 | Original Paper

### Nonlinear passive control of a pendulum submitted to base excitations

We seek to understand the behavior of a pendulum under parametric excitation coupled with a nonlinear absorber. First, the reference system without any coupled absorber, i.e., a simple pendulum, is analyzed with a multiple scale method thanks to …

Authors:
Gabriel Hurel, Alireza Ture Savadkoohi, Claude-Henri Lamarque

22-02-2021 | Original Paper

### Classical Kapitsa’s problem of stability of an inverted pendulum and some generalizations

The classical Kapitsa’s problem of stability of an inverted pendulum subjected to vertical vibration of the support and some generalizations are investigated. The asymptotic method of two-scale expansions allows one to determine the level of …

Authors:
A. K. Belyaev, N. F. Morozov, P. E. Tovstik, T. M. Tovstik, T. P. Tovstik

22-02-2021 | ORIGINAL ARTICLE

### Experimental and simulation study of the ED-milling flow field to improve its machining performance

In electrical discharge milling (ED-milling), the flow field of the working medium plays an important role in the removal of discharge eroded particles from the discharge gap. In this work, a flow field model between the electrode and workpiece …

Authors:
Chengbo Guo, Shufa Sun, Shichun Di, Dongbo Wei

22-02-2021 | ORIGINAL ARTICLE

### Cutting mechanism of enhanced phase γ' in Inconel 718 based on strain gradient theory

Inconel 718 is one kind of nickel-based superalloy containing γ′ precipitates (Ni3Al). It has been widely used in aerospace field due to its high strength, high oxidation resistance, and corrosion resistance at high temperature. Considering the …

Authors:
ZhaoPeng Hao, JiNing Li, YiHang Fan

22-02-2021

### Friction Stir Welding of 5052-H18 Aluminum Alloy: Modeling and Process Parameter Optimization

In this paper, rolled sheets of aluminum alloy 5052-H18 were joined by friction stir welding. Several samples were welded by varying the principal parameters including tool rotational speed, linear speed, tool shoulder diameter, and pin diameter.

Authors:

22-02-2021

### Effects of TiO2 Mass Fraction on Friction Reduction and Wear Resistance of Laser-Cladded CrNi Alloy Coating

To elevate the friction and wear performances of hot work mold, CrNi coatings with the different TiO2 mass fractions were fabricated on H13 steel using laser cladding (LC). The morphologies and phases of obtained coatings were analyzed using a …

Authors:
Wei Li, Dejun Kong

22-02-2021 | Original Research

### Numerical study of chip formation and cutting force in high-speed machining of Ti-6Al-4V bases on finite element modeling with ductile fracture criterion

This paper suggests a novel numerical model to accurately simulate the chip formation for a wide range of high cutting speeds. It consists of finite element (FE) modeling of orthogonal machining of titanium alloy (Ti-6Al-4V) in which the …

Author:
Mehmet Aydın

22-02-2021

### Aggregation Encryption Method of Social Network Privacy Data Based on Matrix Decomposition Algorithm

Currently, there are some defects in data aggregation encryption methods, such as low accuracy and efficiency. In this regard, this paper proposes an aggregation encryption method of social network privacy data based on matrix decomposition.

Author:
Hongjing Bi

22-02-2021

### A lightweight model with spatial–temporal correlation for cellular traffic prediction in Internet of Things

Accurate cellular traffic prediction becomes more and more critical for efficient network resource management in the Internet of Things (IoT). However, high-accuracy prediction results are usually accompanied by high computational capacity …

Authors:
Wei-Che Chien, Yueh-Min Huang

22-02-2021

### Species-specific breeding habitat association of declining farmland birds within urban environments: conservation implications

Human settlements represent important year-round habitats for many declining farmland birds; however, detailed knowledge of species-specific habitat associations is crucial for effective conservation of individual species. In this study, we …

Authors:
Jan Havlíček, Jan Riegert, Jaroslava Bandhauerová, Roman Fuchs, Martin Šálek

22-02-2021 Open Access

### Do Nonprofit Organizations Experience Precarious Employment? The Impact of NGO Commercialization

The purpose of this article is to examine if Polish non-governmental organizations (NGOs) experience the precarious employment and to identify whether the commercialization of NGOs influences this phenomenon. The study confirms that Polish NGOs …

Author:
Paweł Mikołajczak

22-02-2021 | Original Paper

### Effect of Ti/V ratio on thermodynamics and kinetics of MC in γ/α matrices of Ti–V microalloyed steels

Through the solubility product theory of the ternary secondary phase, classical nucleation theory, and Ostwald ripening theory, a model was established to describe the thermodynamics and kinetics of (Ti, V)C precipitates in austenite/ferrite (γ/α) …

Authors:
Ke Zhang, Xin-jun Sun, Zhao-dong Li, Kun Xu, Tao Jia, Zheng-hai Zhu, Xiao-yu Ye, Jun-yu Kang, Qi-long Yong

21-02-2021

### Remittances and value added across economic sub-sectors in Sub-Saharan Africa

This research assesses the relevance of enhancing remittances on value added across economic sectors in sub-Saharan Africa for the period 1980–2014 using the Generalised Method of Moments. First, no significant net effects on added value to the …

Authors:
Simplice A. Asongu, Nicholas M. Odhiambo

21-02-2021 Open Access

### Thermal error modeling based on BiLSTM deep learning for CNC machine tool

The machining accuracy of computer numerical control machine tools has always been a focus of the manufacturing industry. Among all errors, thermal error affects the machining accuracy considerably. Because of the significant impact of Industry …

Authors:
Pu-Ling Liu, Zheng-Chun Du, Hui-Min Li, Ming Deng, Xiao-Bing Feng, Jian-Guo Yang

21-02-2021 | REGIONAL TOPICS FROM LATIN AMERICA

### Reducing the carbon and water footprints of Brazilian green coconut

Coconut ( Cocos nucífera , L ) is cultivated in several countries and in all five continents. In 2017, the world coconut production comprised 12,303,924 harvested hectares and 60,773,436 tons of coconut (FAO 2019 ). In recent years, the production …

Authors:
Ana Paula C. Sampaio, Anne Karolyne P. Silva, Júlio R. A. de Amorim, Antônio D. Santiago, Fábio R. de Miranda, Viviane S. Barros, Marta Celina L. Sales, Maria Cléa B. de Figueirêdo

21-02-2021 | Original Research

### Upgrading the enzymatic hydrolysis of lignocellulosic biomass by immobilization of metagenome-derived novel halotolerant cellulase on the carboxymethyl cellulose-based hydrogel

Degradation of various types of lignocellulosic biomass that require harsh pretreatment and abnormal operating conditions often occur in presence of a large amount of salt. Therefore, identification and use of stable and halotolerant cellulases is …

Authors:
Elaheh Motamedi, Seyedeh Fatemeh Sadeghian Motahar, Morteza Maleki, Kaveh Kavousi, Shohreh Ariaeenejad, Ali A. Moosavi-Movahedi, Ghasem Hosseini Salekdeh

21-02-2021 | Research Paper

### Topology optimization of shape memory polymer structures with programmable morphology

We present a novel optimization framework for optimal design of structures exhibiting memory characteristics by incorporating shape memory polymers (SMPs). SMPs are a class of memory materials capable of undergoing and recovering applied …

Authors:
Anurag Bhattacharyya, Kai A. James

21-02-2021 | ORIGINAL ARTICLE

### Experimental evaluation of the lubrication performance of MoS2/TiO2 nanoparticles for diamond wheel bond in silicon carbide ceramic grinding

In this study, a new type of self-lubricating nanoparticle diamond grinding wheel with MoS2 and TiO2 nanoparticles as filling materials was proposed. According to the macro parameters (grinding force) and micro parameters (surface roughness …

Authors:
Xiaohong Zhang, Ruyi Jiang, Chao Li, Zhaoyao Shi, Dongdong Wen, Zhuoran Wang, Zejian Shi, Jie Jiang

21-02-2021

### Physical, optical, thermal, mechanical, and photon shielding properties of Rb2O-reinforced SiO2–Na2O–CaO–MgO–Al2O3 glass system

The current work explored the first Rb2O-reinforced silicate glass (SG) system for determining potential use in radiation shielding applications. The glass system of (72 − x)SiO2–14.5Na2O–7.8CaO–4.2MgO–1.5Al2O3 − xRb2O where x: 0, 9, 18, 27, and …

Authors:
Recep Kurtulus, Cansu Kurtulus, Taner Kavas

21-02-2021

### First-principles study of two-dimensional puckered and buckled honeycomb-like carbon sulfur systems

The stability and geometrical, mechanical, and electronic properties of monolayer carbon sulfur (CS) systems with honeycomb-like structure are studied by using first-principles calculations based on density functional theory. The results …

Authors:
Qiang Zhang, Fuchun Zhang

21-02-2021

### Bronze Metallurgy in Southeast Asia with Particular Reference to Northeast Thailand

The long-awaited definitive chronology for the period from the initial use of bronze metallurgy to the end of the Iron Age on the Khorat Plateau of Northeast Thailand has received near universal acceptance. In this review, we trace how bronze was …

Authors:
C. F. W. Higham, H. Cawte

20-02-2021 | Regular Article Open Access

### Back to the past: the historical roots of labor-saving automation

This paper, relying on a still relatively unexplored long-term dataset on U.S. patenting activity, provides empirical evidence on the history of labor-saving innovations back to early nineteenth century. The identification of …

Authors:
Jacopo Staccioli, Maria Enrica Virgillito

20-02-2021 | Regular Paper

### Design ensemble deep learning model for pneumonia disease classification

With the recent spread of the SARS-CoV-2 virus, computer-aided diagnosis (CAD) has received more attention. The most important CAD application is to detect and classify pneumonia diseases using X-ray images, especially, in a critical period as …

Author:
Khalid El Asnaoui

20-02-2021

### A Hybrid Transform for Reduction of Peak to Average Power Ratio in OFDM System

The performance of orthogonal frequency multiplexing (OFDM) communication systems is affected by the peak to average power ratio (PAPR). The research work uses a hybrid transform for reducing this PAPR value. In recent years, OFDM is more …

Authors:
Kirubanandasarathy Nageswaran, Murugeswari Selvan, Mahendran Gandhi

20-02-2021

### An analysis of political uncertainty and corporate investment cycles in Pakistan

This paper documents the cycles in corporate investments around national elections in Pakistan from 2000 to 2016. It employed the investment-Q model as the baseline specification with firm fixed effects. Results revealed that during election …

Authors:
Zonaira Akbar, Malik Fahim Bashir, Yasir Bin Tariq

20-02-2021 Open Access

### The effects of social spending on entrepreneurship in developed nations

Understanding how national policy can spur entrepreneurial activity is central to entrepreneurship research. Over the past decade, there has been a limited set of research findings to suggest that social spending may increase entrepreneurship in …

Authors:
Shelby Solomon, Joshua S. Bendickson, Eric W. Liguori, Matthew R. Marvel

20-02-2021

### Boosting energy storage performance in Ba0.8Sr0.2Zr0.1Ti0.9O3–Na0.5Bi0.5TiO3 lead-free nanoceramics through polar nanoregions and grain refinement engineering

Polar nanoregions and grain refinement engineering are alternative methods to develop comprehensive energy storage performance ceramic materials. In our work, Ba0.8Sr0.2Zr0.1Ti0.9O3 (BSZT) and Na0.5Bi0.5TiO3 (NBT) powders with average particle …

Authors:
Run Zhang, Lili Zhao, Zhi’ang Zhang, Xiaoting Zhang, Quan Jin, Bin Cui

20-02-2021 | Research Article-Physics

### Characterization, Structure, Dielectric Permittivity, and AC Conductivity of Co–Ni-Doped Bentonite at Room Temperature

xCo–5%Ni (where x = 0, 1, 3, and 5%) coatings on bentonite were synthesized by insipient wet impregnation method. The phase structures of the coatings, surface analysis, dielectric property of the samples as a function of frequency (at room …

Author:
Ali H. Bashal

20-02-2021 | Original Paper

### Core Jamming in Unconsolidated Formations

In coring operations, core jamming is a permanent concern, taking place when the rock core sample becomes stuck within the inner core barrel, thus preventing further acquisition. This is undesirable in hard formations, for it stops the penetration …

Authors:
Flávio Tito Peixoto Filho, Euripedes do Amaral Vargas Junior, Erick Slis Raggio Santos, Francisco Henriques Ferreira

20-02-2021 | Original

### Enhancing the performance of micro-biosensors by functionally graded geometrical and material parameters

Most recently, the whole world is struggling against the virulent pandemic COVID-19. Due to the unbounded global spread of the disease, having biosensors with high performance such as high sensitivity and accuracy is of utmost importance. In this …

Authors:
Yasser M. Shabana, Mohamed A. Samy, Mohamed A. Abdel-Aziz, Mohamed E. Hindawi, Mohamed G. Mosry, Abdul-Rahman M. Albarawy, Mazen M. Omar, Ayman A. Mohamed, Ahmed A. Attia

20-02-2021 | SPECIAL FEATURE: ORIGINAL ARTICLE

### Chemical recycling of waste Poly Vinyl Chloride (PVC) by the liquid-phase treatment

Liquid-phase treatment of waste Poly Vinyl Chloride (PVC) was performed. Chlorine change rate was high when using alcohol, cresol and terpene compared with that observed in the treatment without solvent, so the importance of solvent for …

Authors:
Kazushi Nozue, Hideyuki Tagaya
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