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21 – 30 of over 4000The purpose of this paper is to propose a novel quasi-nonlocal coupling of the bond-based peridynamic model with the classical continuum mechanics model to fully take advantage of…
Abstract
Purpose
The purpose of this paper is to propose a novel quasi-nonlocal coupling of the bond-based peridynamic model with the classical continuum mechanics model to fully take advantage of their merits and be free of ghost forces.
Design/methodology/approach
This study reconstructs a total energy functional by introducing a coupling parameter that alters only the nonlocal interactions in the coupling region rather than the whole region and a modified elasticity tensor that affects the local interactions. Then, the consistency of force patch test is enforced in the coupling region to completely eliminate the ghost force in a general energy-based coupling scheme. For a one-dimensional problem, these coupling parameters are further determined through an energy patch test to preserve the energy equivalence or through an l1-regularization. And, for a two- or three-dimensional problem, depending on the existence of a solution to the discretized force patch test, they are determined through an l1-minimization or l1-regularization.
Findings
One- and two-dimensional numerical examples under affine deformation have been conducted to verify the accuracy of the quasi-nonlocal coupling method, which exhibits no ghost force. Moreover, the coupling model can reproduce almost the same deformation behaviors of points near the crack for a cracked plate under tension as that from a pure peridynamic model, the former with a rather low computational cost and an easier application of boundary conditions.
Originality/value
This work is aiming at getting over long-standing ghost force issues in the energy-based coupling scheme. The numerical results from the cracked plate problem are exhibited promising extension to dynamic problems.
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The purpose of this paper is to examine the factors explaining the success of Hong Kong’s Independent Commission Against Corruption (ICAC) and the challenges which it faces in…
Abstract
Purpose
The purpose of this paper is to examine the factors explaining the success of Hong Kong’s Independent Commission Against Corruption (ICAC) and the challenges which it faces in maintaining that success.
Design/methodology/approach
Utilising a review of primary and secondary sources, a syndrome of success characteristics is developed and analysed against a backdrop of recent high-level scandals involving corruption and unethical behaviour.
Findings
The paper concludes that the institutionalisation of key structures and processes has enabled the ICAC to perform successfully to date but that the prospect of political interference may represent a significant future challenge.
Originality/value
Although there has been widespread attention to ICAC success factors, some important features have been neglected and little academic attention has been devoted to recent political challenges to its position.
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Purpose – The chapter explores how gendered division of labor shapes gender hierarchal relationships, inequality, social mobility, and labor solidarity of women and men workers in…
Abstract
Purpose – The chapter explores how gendered division of labor shapes gender hierarchal relationships, inequality, social mobility, and labor solidarity of women and men workers in the small-scale restaurant industry in China.
Methodological approach – Thirty-four interviews with restaurant workers were conducted and a survey was taken.
Findings – Small-scale restaurants in China are patriarchal in structure that symbolizes a familial hegemonic regime. Labor is divided by gender, age and, to some extent, class with women concentrated in the lower positions. Most restaurant workers are young migrant women who come to the city to work before marrying and having children. Restaurant work is arduous: the hours are long and the wages are low. Women workers do not advance beyond the position of server, while men make use of social contacts and advance in status and wages. Because of kinship and village ties as well as divisions by age and gender, class solidarity cannot be achieved.
Value of the study – The chapter focuses on a topic that has been little studied. It furthers an understanding of intersectionality and inequality among food service workers in the context of China.
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Constructing a low-carbon agriculture (LCA) park is considered an effective means to reduce greenhouse gas (GHG) emissions in developing countries. This study aims to explore the…
Abstract
Purpose
Constructing a low-carbon agriculture (LCA) park is considered an effective means to reduce greenhouse gas (GHG) emissions in developing countries. This study aims to explore the effectiveness of integrated low-carbon agricultural technologies based on evidence from a pilot LCA experiment in Shanghai, China, from 2008 to 2011.
Design/methodology/approach
Integrated low-carbon technologies in an agricultural park were adopted to reduce GHG emissions. Reduced emissions and net economic benefits were calculated by comparing emissions before and after the implementation of the experiment.
Findings
Results show that the low-carbon agricultural park experiment markedly reduced GHG emissions. This outcome can be attributed to the integrated technologies adopted in the experiment, including the reuse and recycle of resources, control of environmental pollution and GHG emissions and improvement of economic efficiency and social benefit. All the technologies adopted are already available and mature, thus indicating the great potential of LCA to reduce GHG emissions despite the lack of advanced technologies. However, supporting policies may be necessary to motivate private interests in LCA because of the considerable starting investments.
Originality/value
Previous macro-level and policy studies on LCA are based on knowledge from experimental studies, which typically specify environmental conditions to explore solely the effects of one low-carbon technology. Practically, integrating several low-carbon technologies in one experiment may be more effective, particularly for extensive agriculture, in developing countries. The effectiveness of integrated technologies is insufficiently discussed in the literature. Therefore, this study explores how effective integrated feasible LCA technologies can be in terms of both emission reduction and economic benefits based on the data obtained from an experiment in Shanghai, China.
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The purpose of this paper is to explore the factors that influence migrant workers' household registration transfer willingness at both individual and urban levels and to provide…
Abstract
Purpose
The purpose of this paper is to explore the factors that influence migrant workers' household registration transfer willingness at both individual and urban levels and to provide empirical evidence on adjusting the household registration system to accommodate economic development and migrant workers' imbalances.
Design/methodology/approach
This paper adopts a hierarchical nonlinear model and examines individual and urban influencing factors of migrant workers' household registration transfer willingness, based on the data from China Migrants Dynamic Survey (CMDS) and the Urban Statistical Yearbooks.
Findings
This paper shows that: (1) multi-factors, such as age, education, marital status, household demographics, industry and migrant workers' contract coverage, have significant effects on migrant workers' household registration transfer willingness; (2) The urban public service equalization indicators, such as regional economic, educational resources, medical care and ecological quality, have significant effects on migrant workers' willingness to transfer household registration; (3) The heterogeneity of migrant workers' willingness to transfer household registration is significant in central, eastern and western China.
Research limitations/implications
The authors provide a fresh perspective on population migration research in China and other countries worldwide based on the pull–push migration theory, which incorporates both individual and macro (urban) factors, enabling a comprehensive examination of the factors influencing household registration transfer willingness. This hierarchical ideology and approach (hierarchical nonlinear model) could be extended to investigate the influencing factors of various other human intentions and behaviors.
Originality/value
Micro approaches (individual perspective) have dominated existing studies examining the factors influencing migrant workers' household registration transfer willingness. The authors combine individual and urban perspectives and adopt a more comprehensive hierarchical nonlinear model to extend the empirical evidence and provide theoretical explanations for the above issues.
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Xiong Zhang, Wei T. Yue and Wendy Hui
The emergence of internet-enabled technology has led to the software service model in which the software firm, instead of the consumer, maintains software ownership. This model…
Abstract
Purpose
The emergence of internet-enabled technology has led to the software service model in which the software firm, instead of the consumer, maintains software ownership. This model can curtail software piracy more effectively than the traditional on-premises software model. However, software firms are not abandoning traditional on-premises software but embracing both models simultaneously. In this study, the authors consider a firm’s software bundling decision in combination with its piracy deterrence strategy. The paper aims to discuss these issues.
Design/methodology/approach
The authors build three stylized models to analytically compare the bundling strategies under three scenarios: no piracy, piracy is present and piracy is present while the firm applies digital rights management (DRM).
Findings
The authors find pure bundling (PB) to be the optimal strategy due to the combination of competition and cannibalization effects in mixed bundling (MB). Simultaneously, consumers may enjoy greater surplus in PB than in MB, making PB the preferred strategy for both the firm and consumers. Interestingly, the win-win outcome coexists with some degree of piracy in the market.
Originality/value
The results provide important insights for firms and policy-makers and contribute to the literature on piracy and product bundling. First, the authors show piracy could be another driver for product bundling, which has never been discussed in prior literature. Second, the authors suggest an alternative perspective; that PB may be a desirable outcome for both firms and consumers when considering piracy and DRM. More surprisingly, this desirable outcome occurs with some level of piracy in the market. The presence of piracy leads to competition and cannibalization effects in MB, which eventually results in the win-win outcome in the software market for both the firm and the consumers.
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Youmin Xi, Xuanwei Cao and Liuxu Xiangli
The purpose of this paper is to introduce the indigenous He‐Xie management theory (HXMT) through the lens of a holistic perspective from Chinese philosophical wisdom.
Abstract
Purpose
The purpose of this paper is to introduce the indigenous He‐Xie management theory (HXMT) through the lens of a holistic perspective from Chinese philosophical wisdom.
Design/methodology/approach
The paper revisited the challenges faced by orthodox management theories, proposing management scholars should borrow Eastern philosophical intelligence for problem solving when considering the tradition of Chinese culture on human orientation and its intelligence on tolerating and coping with ambiguity, uncertainty, and complexity. By tracing back the core concept of harmony in Confucianism, the paper identified the mechanisms for achieving harmony by differentiating further the general understanding of harmony and its original meaning in Chinese characters. The theoretical framework of HXMT was introduced then by integrating both evolutionism and constructivism perspectives.
Findings
The theoretical explaining power of HXMT is rooted in the time‐honored philosophies of Asia. HXMT got its gene from traditional thinking by applying dialectic and holistic perspectives. Within complex and unpredictable contexts, the existence of He‐Xie theme can replace the searching and planning to strategy. Guided by He‐Xie theme, the He principle and the Xie principle, as well as the coupling between them, compose the fundamental mechanisms for effective management and better performance in organizations.
Originality/value
The paper opens an avenue for indigenous HXMT. As a methodology for guiding management research and practice in coping with complexity and uncertainty, HXMT is expected to attract more attention from scholars to contribute to knowledge creation in Chinese management studies.
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Qinglong An, Dapeng Dong, Xiaohu Zheng, Ming Chen and Xibin Wang
The objective of this study is to develop an automated tool condition monitoring scheme for PCB drilling.
Abstract
Purpose
The objective of this study is to develop an automated tool condition monitoring scheme for PCB drilling.
Design/methodology/approach
Vibration signals are used to distinguish micro drill wear stages with proper features extraction and classifier design. Then a tool condition monitoring system is built up through a back propagation neural network (BPNN).
Findings
Experimental results show that BPNN is a practical method of modeling tool wear, and with this method a tool condition monitoring system is built up using energy ratio, root mean square (RMS) and kurtosis coefficient that transformed by vibration signals.
Research limitations/implications
In the further investigation, more signal samples should be computed as monitoring features for BPNN modeling. In addition, in order to build the best monitoring model, it is necessary to evaluate the performance of the BPNN model in advance, and optimize the process.
Originality/value
The paper provides a method and a system for PCB drill wear monitoring. The method and system can achieve on‐line monitoring of PCB drill condition.
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Gang Zhang, Jianhua Wu, Pinkuan Liu and Han Ding
Based on the inverse kinematics and task space dynamic model, this paper aims to design a high-precision trajectory tracking controller for a 2-DoF translational parallel…
Abstract
Purpose
Based on the inverse kinematics and task space dynamic model, this paper aims to design a high-precision trajectory tracking controller for a 2-DoF translational parallel manipulator (TPM) driven by linear motors.
Design/methodology/approach
The task space dynamic model of a 2-DoF TPM is derived using Lagrangian equation of the first type. A task space dynamic model-based feedforward controller (MFC) is designed, which is combined with a cascade PID/PI controller and velocity feedforward controller (VFC) to construct a hybrid PID/PI+VFC/MFC controller. The hybrid controller is implemented in MATLAB/dSPACE real-time control platform. Experiment results are given to validate the effectiveness and industrial applicability of the hybrid controller.
Findings
The MFC can compensate for the nonlinear dynamic characteristics of a 2-DoF TPM and achieve better tracking performance than the conventional acceleration feedforward controller (AFC).
Originality/value
The task space dynamic model-based hybrid PID/PI+VFC/MFC controller is proposed for a 2-DoF linear-motor-driven TPM, which reduces the tracking error by at least 15 percent compared with conventional hybrid PID/PI+VFC/AFC controller. This control scheme can be extended to high-speed and high-precision trajectory tracking control of other parallel manipulators by reprogramming the feedforward signals of traditional cascade PID/PI controller.
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The purpose of the paper is to identify learning points and inspirations from two different approaches by examining how education for sustainable development (ESD) initiatives are…
Abstract
Purpose
The purpose of the paper is to identify learning points and inspirations from two different approaches by examining how education for sustainable development (ESD) initiatives are delivered in the University of X in the UK and Tongji University in China.
Design/methodology/approach
Through comparison of case studies, the pros and cons of each approach are made clear. The paper adopts semi-structured interviewing among staff and group interviewing among students as its main data collection methods. A snowball sampling strategy is employed to select potential interviewees in addition.
Findings
Learning points are drawn from each institution which could be useful in informing the strategy of other higher education institutions. The main learning points for UoX are: first, engage as many students as possible through linking extra-curriculum activities back to the curriculum and offer opportunities for students to take part in campus operations. Second, a project-oriented approach could be employed to enhance interdisciplinary cooperation. The main learning points for Tongji are: pedagogic changes are required to realize a transformative education and additions of more active learning into the curriculum are needed. Third, policy support is necessary to promote the ESD agenda but only when the top-down approach mixes with a bottom-up approach significant changes will happen.
Practical implications
ESD is transformative education rather than traditional education. It will guide students to study and live in a more sustainable way, which is promoted in both the formal curriculum and informal areas (including campus greening and extra-curriculum activities) in UoX as a model for developed countries and Tongji as a model for developing countries. As a dynamic whole, both of them comprise students' learning and living experiences in a microcosm of a pilot sustainable community through inter-disciplinary approaches.
Originality/value
Little comparative and international research has been done in the field of educational ESD. The research seeks to address the deficiency by comparing the ESD approaches in one British and one Chinese university.
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