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Article
Publication date: 2 January 2018

Yongkun Wang, Tianran Ma, Wenchao Tian, Junjue Ye, Xing Wang and Xiangjun Jiang

The purpose of this paper is to prepare novel electroactive shape memory nanocomposites based on graphene and study the thermomechanical property and shape memory behavior…

Abstract

Purpose

The purpose of this paper is to prepare novel electroactive shape memory nanocomposites based on graphene and study the thermomechanical property and shape memory behavior of nanocomposites.

Design/methodology/approach

Graphene was dispersed in N,N-dimethylformamide, and the mixture was spooned into epoxy-cyanate ester mixtures to form graphene/epoxy-cyanate ester nanocomposites. The nanocomposites were deformed under 150°C, and shape recovery test was conducted under an electric voltage of 20-100 V.

Findings

Graphene is used to improve the shape recovery behavior and performance of shape-memory polymers (SMPs) for enhanced electrical actuation effectiveness. With increment of graphene content, the shape recovery speed of nanocomposites increases significantly.

Research limitations/implications

A simple way for fabricating electro-activated SMP nanocomposites has been developed by using graphene.

Originality/value

The outcome of this study will help to fabricate the SMP nanocomposites with high electrical actuation effectiveness and improve the shape recovery speed of the nanocomposites.

Details

Pigment & Resin Technology, vol. 47 no. 1
Type: Research Article
ISSN: 0369-9420

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Article
Publication date: 13 November 2017

Xing Wang and Xuefeng Shao

This paper aims to seek the optimal proportion of female executives in corporate management teams, and to analyze the threshold effect of the proportion of female…

Abstract

Purpose

This paper aims to seek the optimal proportion of female executives in corporate management teams, and to analyze the threshold effect of the proportion of female executives on the enterprise market value and enterprise management performance by using a panel threshold regression model. The purpose of this paper is to obtain the optimal interval, during which female executives exert positive effects on enterprise market value and enterprise management performance.

Design/methodology/approach

Based on the data of listed companies in SSE from 2003 to 2012, this paper conducts theoretical and empirical analysis by using a panel threshold regression model.

Findings

This paper proves that the proportion of female executives has a threshold effect on the enterprise market value and enterprise management performance. The results show that the proportion of female executives has an optimal interval. In other words, during the 53.8-68.4 percent interval, the proportion of female executives exerts the least negative effect on the enterprise market value and the most positive effect on the enterprise management performance.

Originality/value

In this paper, the non-linear relationship between female executives, enterprise market value and enterprise management performance has been verified, and the optimization interval of the female executives’ proportion has been figured out as well.

Details

Journal of Organizational Change Management, vol. 30 no. 7
Type: Research Article
ISSN: 0953-4814

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Article
Publication date: 6 October 2020

Zhonglu Zeng, Xing Wang and IpKin Anthony Wong

The adaptation hypothesis suggests that gambling participation would gradually decline after an initial exposure to this activity. While this hypothesis was tested in…

Abstract

Purpose

The adaptation hypothesis suggests that gambling participation would gradually decline after an initial exposure to this activity. While this hypothesis was tested in pathological gambling among residents in Western countries, the present inquiry explores the hypothesis in a tourism context.

Design/methodology/approach

This research is focused on the Mainland Chinese gamblers. Convenience sampling was used. Data were collected outside participating casinos and at major attractions. A total of 498 valid responses were collected.

Findings

By assessing changes of the Mainland Chinese gambling perceptions (e.g. excitement and fallacy) and behaviors, results point to visitor gamblers' decrease in gambling excitement and fallacy as well as budget to income ratio.

Originality/value

By assessing changes of the Mainland Chinese gambling perceptions and behaviors, this research aims to contribute to the literature by demonstrating whether the Chinese gamblers have adapted and hence, are more rational about this recreational activity.

Details

Asian Education and Development Studies, vol. ahead-of-print no. ahead-of-print
Type: Research Article
ISSN: 2046-3162

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Book part
Publication date: 10 July 2019

Marilena Chrysanthakopoulou

The Belt and Road Initiative (BRI) is endeavor of paramount importance that is likely to redefine socio-economic relations in countries and regions concerned. The debate…

Abstract

The Belt and Road Initiative (BRI) is endeavor of paramount importance that is likely to redefine socio-economic relations in countries and regions concerned. The debate on BRI’s relevance, scope, and potential has only begun, and it remains uncertain how exactly it will unfold. In this context, questions pertinent to regulatory frameworks in the context of which BRI initiatives are implemented belong to the most complex and the most interesting ones. Due to BRI’s novelty and open-endedness, all matters pertaining to its implementation are of exploratory nature; especially the legal aspects of its implementation. This aim of this chapter is to provide insightful answers to legal questions regarding BRI and dispute resolution via the examination of the current legal status of BRI, as well as explore how trust and cultural awareness can contribute to the avoidance of business-related disputes.

Details

The New Silk Road Leads through the Arab Peninsula: Mastering Global Business and Innovation
Type: Book
ISBN: 978-1-78756-680-4

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Book part
Publication date: 10 July 2019

Jingjing Wang, Zhiqiang Li, Huanhuan Feng, Yuanjing Guo, Zhengbo Liang, Luyao Wang, Xing Wan and Yalin Wang

Recently, sharing economy is gradually accepted by people, and it has expanded from life to knowledge. It is important to encourage people to produce high quality content…

Abstract

Recently, sharing economy is gradually accepted by people, and it has expanded from life to knowledge. It is important to encourage people to produce high quality content in knowledge sharing area, and knowledge payment is one of the most effective ways to achieve it. Therefore, the knowledge payment has been regarded as a huge business opportunity, and it is of great meaning to study the development trend and feasibility of knowledge payment. This chapter, through big data methods, analyzes the business model of Zhihu (a Chinese platform of knowledge sharing) after it introduced knowledge payment projects, such as Zhihu Live and Pay Consultation. According to data of Zhihu users’ Q&A, concerned fields and others, this chapter tries to outline its user profile to find out the target groups of different topics, the proper form of knowledge payment and the hot topics of Zhihu Live. Through the analysis of knowledge graph, this chapter finds that Zhihu Live is expected to be the mainstream knowledge payment form in the future, and the most potential topics are mainly focused on science, law, and business. Meanwhile, it establishes a pricing model for Zhihu Live, and provides suggestions for the development of knowledge payment.

Details

The New Silk Road Leads through the Arab Peninsula: Mastering Global Business and Innovation
Type: Book
ISBN: 978-1-78756-680-4

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Article
Publication date: 6 November 2017

Si Yuan, Kangsheng Ye, Yongliang Wang, David Kennedy and Frederic W. Williams

The purpose of this paper is to present a numerically adaptive finite element (FE) method for accurate, efficient and reliable eigensolutions of regular second- and…

Abstract

Purpose

The purpose of this paper is to present a numerically adaptive finite element (FE) method for accurate, efficient and reliable eigensolutions of regular second- and fourth-order Sturm–Liouville (SL) problems with variable coefficients.

Design/methodology/approach

After the conventional FE solution for an eigenpair (i.e. eigenvalue and eigenfunction) of a particular order has been obtained on a given mesh, a novel strategy is introduced, in which the FE solution of the eigenproblem is equivalently viewed as the FE solution of an associated linear problem. This strategy allows the element energy projection (EEP) technique for linear problems to calculate the super-convergent FE solutions for eigenfunctions anywhere on any element. These EEP super-convergent solutions are used to estimate the FE solution errors and to guide mesh refinements, until the accuracy matches user-preset error tolerance on both eigenvalues and eigenfunctions.

Findings

Numerical results for a number of representative and challenging SL problems are presented to demonstrate the effectiveness, efficiency, accuracy and reliability of the proposed method.

Research limitations/implications

The method is limited to regular SL problems, but it can also solve some singular SL problems in an indirect way.

Originality/value

Comprehensive utilization of the EEP technique yields a simple, efficient and reliable adaptive FE procedure that finds sufficiently fine meshes for preset error tolerances on eigenvalues and eigenfunctions to be achieved, even on problems which proved troublesome to competing methods. The method can readily be extended to vector SL problems.

Details

Engineering Computations, vol. 34 no. 8
Type: Research Article
ISSN: 0264-4401

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Article
Publication date: 26 April 2013

Arief P. Tjahyono, Kean C. Aw, Harish Devaraj, Wisnu Surendra, Enrico Haemmerle and Jadranka Travas‐Sejdic

The purpose of this paper is to review the challenges present in the development of hand exoskeletons powered by pneumatic artificial muscles. This paper also presents the…

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Abstract

Purpose

The purpose of this paper is to review the challenges present in the development of hand exoskeletons powered by pneumatic artificial muscles. This paper also presents the development of a novel strain sensor and its application in a five‐fingered hand exoskeleton.

Design/methodology/approach

The issues of current hand exoskeletons powered by pneumatic artificial muscles are examined by studying the artificial muscles and the human hand anatomy. Traditional sensors are no longer suitable for applications in hand exoskeletons. A novel strain sensor was developed by depositing a conducting polymer called polypyrrole onto a natural rubber substrate through vapor phase polymerization and is used in the authors' five‐fingered hand exoskeleton.

Findings

The error of measurements from the polypyrrole strain sensor in controlling the actuation of pneumatic artificial muscles is within 1.5 mm. The small physical size and weight of the novel polypyrrole strain sensor also helped to keep the exoskeleton's profile (less than 20 mm) and total weight low (<1 kg).

Originality/value

The novel strain sensor allows the realization of hand exoskeletons that are lightweight, portable and low profile. This improves the comfort and practicality of hand exoskeletons to allow their usage outside the research environment.

Details

Industrial Robot: An International Journal, vol. 40 no. 3
Type: Research Article
ISSN: 0143-991X

Keywords

Content available
Article
Publication date: 1 January 2013

David Bennett

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Abstract

Details

Journal of Manufacturing Technology Management, vol. 24 no. 1
Type: Research Article
ISSN: 1741-038X

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Article
Publication date: 6 June 2016

Ema Kusen and Mark Strembeck

Ever since Mark Weiser coined the term “ubiquitous computing” (ubicomp) in 1988, there has been a general interest in proposing various solutions that would support his…

Abstract

Purpose

Ever since Mark Weiser coined the term “ubiquitous computing” (ubicomp) in 1988, there has been a general interest in proposing various solutions that would support his vision. However, attacks targeting devices and services of a ubicomp environment have demonstrated not only different privacy issues, but also a risk of endangering user’s life (e.g. by modifying medical sensor readings). Thus, the aim of this paper is to provide a comprehensive overview of security challenges of ubicomp environments and the corresponding countermeasures proposed over the past decade.

Design/methodology/approach

The results of this paper are based on a literature review method originally used in evidence-based medicine called systematic literature review (SLR), which identifies, filters, classifies and summarizes the findings.

Findings

Starting from the bibliometric results that clearly show an increasing interest in the topic of ubicomp security worldwide, the findings reveal specific types of attacks and vulnerabilities that have motivated the research over the past decade. This review describes most commonly proposed countermeasures – context-aware access control and authentication mechanisms, cryptographic protocols that account for device’s resource constraints, privacy-preserving mechanisms, and trust mechanisms for wireless ad hoc and sensor networks.

Originality/value

To the best of our knowledge, this is the first SLR on security challenges in ubicomp. The findings should serve as a reference to an extensive list of scientific contributions, as well as a guiding point for the researchers’ novel to the security research in ubicomp.

Details

International Journal of Pervasive Computing and Communications, vol. 12 no. 2
Type: Research Article
ISSN: 1742-7371

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Article
Publication date: 8 June 2021

Yan Gao, Kai Chang, Xuguang Xing, Jiaping Liang, Nian He and Xiaoyi Ma

Traditional laboratory measurements of soil water diffusivity (D) and soil water retention curve (SWRC) are always time-consuming and labor-intensive. Therefore, this…

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Abstract

Purpose

Traditional laboratory measurements of soil water diffusivity (D) and soil water retention curve (SWRC) are always time-consuming and labor-intensive. Therefore, this paper aims to present a simple and robust test method for determining D and SWRC without reducing accuracy.

Design/methodology/approach

In this study, a D model of unsaturated soil was established based on Gardner–Russo model and then a combination of Gardner–Russo model with one-dimensional horizontal absorption method to obtain n and a parameters of Gardner–Russo model. One-dimensional horizontal absorption experiments on loam, silt loam and sandy clay loam were conducted to obtain the relationships between measured infiltration rate and cumulative infiltration with wetting front distance. Based on the obtained relationships, the measured infiltration data from the one-dimensional horizontal absorption tests were used to calculate n and a parameters and further constructing D and SWRC.

Findings

Both the calculated D and SWRC inversed from the infiltration data were in good agreement with the measured ones that obtained from the traditional horizontal absorption method and the centrifuge method, respectively. Error analysis indicated that only the infiltration data are enough to reliably synchronously determine D and SWRC.

Originality/value

A simple and robust method is proposed for synchronous determination of soil water diffusivity and water retention curve.

Details

Engineering Computations, vol. ahead-of-print no. ahead-of-print
Type: Research Article
ISSN: 0264-4401

Keywords

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