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1 – 10 of 132Xin Li, ZaiFu Cui, Daoheng Sun, Qinnan Chen, Gonghan He, Baolin Liu, Zhenyin Hai, Guochun Chen, Zhiyuan Jia and Zong Yao
The measurement of heat flux is of importance to the development of aerospace engine as basic physical quantities in extreme environment. Heat radiation is one of the basic forms…
Abstract
Purpose
The measurement of heat flux is of importance to the development of aerospace engine as basic physical quantities in extreme environment. Heat radiation is one of the basic forms of heat transfer phenomenon. The structure optimizing can improve the performance and infrared absorptivity of the thin film sensor.
Design/methodology/approach
This paper designed one kind of thin film heat flux sensor (HFS) with antireflective coating based on transparent conductive oxide thermopile. The introduced membrane structure is so thin that it has little impact on sensor performance. Fabrication of thin film sensors were fabricated by physical vapor deposition (PVD) process.
Findings
The steady-state and dynamic response characteristics of the HFS were investigated by calibration platform. The experimental results shown that the absorptivity of the membrane structure (for1070nm) improved compared with that before optimization. The sensitivity of heat flux gauge was 48.56 µV/ (kW/m2) and its frequency response was determined to be about 1980 Hz.
Originality/value
The thin film HFS uses thermopile based on Indium Tin Oxid and In2O3. The antireflective coating is introduced to hot endpoint of HFS to improve sensitivity on laser thermal source. The infrared optical properties of membrane layer structure were investigated. The steady-state and the transient response characteristics of the heat flux sensor were also investigated.
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Cheng Lei, Haiyang Mao, Yudong Yang, Wen Ou, Chenyang Xue, Zong Yao, Anjie Ming, Weibing Wang, Ling Wang, Jiandong Hu and Jijun Xiong
Thermopile infrared (IR) detectors are one of the most important IR devices. Considering that the surface area of conventional four-end-beam (FEB)-based thermopile devices cannot…
Abstract
Purpose
Thermopile infrared (IR) detectors are one of the most important IR devices. Considering that the surface area of conventional four-end-beam (FEB)-based thermopile devices cannot be effectively used and the performance of this type of devices is relatively low, this paper aims to present a double-end-beam (DEB)-based thermopile device with high duty cycle and performance. The paper aims to discuss these issues.
Design/methodology/approach
Numerical analysis was conducted to show the advantages of the DEB-based thermopile devices.
Findings
Structural size of the DEB-based thermopiles may be further scaled down and maintain relatively higher responsivity and detectivity when compared with the FEB-based thermopiles. The authors characterized the thermoelectric properties of the device proposed in this paper, which achieves a responsivity of 1,151.14 V/W, a detectivity of 4.15 × 108 cm Hz1/2/W and a response time of 14.46 ms sensor based on DEB structure.
Orginality/value
The paper proposed a micro electro mechanical systems (MEMS) thermopile infrared sensor based on double-end-beam structure.
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Weisheng Li and Meng Tian
This study scrutinised Shanghai junior high school teachers’ emotions and emotion management strategies in relation to teachers’ work settings and content. A mixed-methods…
Abstract
This study scrutinised Shanghai junior high school teachers’ emotions and emotion management strategies in relation to teachers’ work settings and content. A mixed-methods approach was applied to collect data via field observations, interviews, and a quantitative survey. The aim of this study was two-fold. Firstly, it aimed to identify the typical work settings in which teachers experienced work-related emotions. Secondly, it aimed to reveal teachers’ priority work in school and how it affected teachers’ choices of emotion management strategies.
The data were analysed through the lens of emotional labour theories and professional agency theories. Findings showed that classroom teaching and the professional learning community activities were two typical settings in which the teachers experienced the most intensive emotions. Most Shanghai teachers managed their momentary emotions by either genuinely expressing their emotions that matched their roles and the scenario, or by purposely suppressing emotions to meet social and organisational expectations. Furthermore, most teachers adopted the long-term mood regulation strategy by aligning their emotions with long-term goal achievement in the future. As professional agents, the Shanghai teachers did not only manage their own emotions at work using these two strategies, but also managed students’ emotions as part of the moral education.
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Shuang Ren and Ying Zhu
The purpose of this paper is to investigate why managerial leaders engage in leader self-development (SD) vis-à-vis China’s transition process and what domains of leadership…
Abstract
Purpose
The purpose of this paper is to investigate why managerial leaders engage in leader self-development (SD) vis-à-vis China’s transition process and what domains of leadership competencies are enhanced. It aims to investigate leader SD as an interaction between self-regulation and the confluence of multiple contexts experienced simultaneously by these managerial leaders within China’s transition.
Design/methodology/approach
This paper adopts a two-phase exploratory sequential mixed-method design. The absence of empirical research on leader SD in China led to a qualitative approach in the initial stage. Focus groups were first conducted to establish the relevance of the focal construct in a holistic and elaborative way. In-depth interviews were then undertaken to capture the richness of the phenomenon through meaningful contextualization and to identify themes as representative of issues faced by participants. Seven themes emerged from this process, which, through consultation with the relevant literature, were operationalized in the second stage to generate a survey for hypothesis testing.
Findings
The combination of insights from qualitative and quantitative studies highlights the dynamic and interactive nature of leader SD as a product of contextual and personal influences in China. The influential mechanisms connecting personal and contextual enablers and SD are in the cognitive processing of developmental needs and personal responsibility. Chinese managerial leaders who take the initiative to assess their own developmental needs and assume responsibility for their development are more likely to undertake SD. The developmental activities focus primarily on technical leadership competencies.
Research limitations/implications
A competency perspective to development may not address fully complexities involved in leader development. Also developing leadership competencies is an ongoing process. Due to limited time and fund, this paper did not take a time perspective to investigate both the immediate and long-term outcomes of leader SD.
Practical implications
SD is an emerging strategy that has the potential to address the shortage of managerial leadership competencies. The analysis of the self-regulatory process explains the mediating dynamism underlying different domains of leader SD. Recruitment focusing on people with a relatively higher degree of self-regulation thus increases the potential for organizations to staff themselves with employees aware of, and prepared for, SD organization would like to take place. It is also advisable that organizations make efforts to create a learning environment in general.
Originality/value
This mixed-method approach provides a multi-layered investigation that ultimately adds rigor and relevance to the research findings. It is this analysis of the complex web of economic, social and cultural contexts existing in China, and applying them to social cognitive theory as an explanatory platform, that underpins the originality of the study.
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Tamoor Khan, Jiangtao Qiu, Ameen Banjar, Riad Alharbey, Ahmed Omar Alzahrani and Rashid Mehmood
The purpose of this paper is to assess the impacts on production of five fruit crops from 1961 to 2018 of energy use, CO2 emissions, farming areas and the labor force in China.
Abstract
Purpose
The purpose of this paper is to assess the impacts on production of five fruit crops from 1961 to 2018 of energy use, CO2 emissions, farming areas and the labor force in China.
Design/methodology/approach
This analysis applied the autoregressive distributed lag-bound testing (ARDL) approach, Granger causality method and Johansen co-integration test to predict long-term co-integration and relation between variables. Four machine learning methods are used for prediction of the accuracy of climate effect on fruit production.
Findings
The Johansen test findings have shown that the fruit crop growth, energy use, CO2 emissions, harvested land and labor force have a long-term co-integration relation. The outcome of the long-term use of CO2 emission and rural population has a negative influence on fruit crops. The energy consumption, harvested area, total fruit yield and agriculture labor force have a positive influence on six fruit crops. The long-run relationships reveal that a 1% increase in rural population and CO2 will decrease fruit crop production by −0.59 and −1.97. The energy consumption, fruit harvested area, total fruit yield and agriculture labor force will increase fruit crop production by 0.17%, 1.52%, 1.80% and 4.33%, respectively. Furthermore, uni-directional causality is correlated with the growth of fruit crops and energy consumption. Also, the results indicate that the bi-directional causality impact varies from CO2 emissions to agricultural areas to fruit crops.
Originality/value
This study also fills the literature gap in implementing ARDL for agricultural fruits of China, used machine learning methods to examine the impact of climate change and to explore this important issue.
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The purpose of this paper is to explore the means for enhancing the image and business legitimacy of a socially discredited industry – pawnbroking in pre-1949 China – are…
Abstract
Purpose
The purpose of this paper is to explore the means for enhancing the image and business legitimacy of a socially discredited industry – pawnbroking in pre-1949 China – are explored. Previous studies suggest companies operating within such industries cannot solely rely on hard marketing strategies “to maximize sales and profits as they do with soaps and shoes” (Davidson, 2003, p. 7). Instead, they must find soft strategies for improving company and industry image and legitimacy.
Design/methodology/approach
This research relies on qualitative analysis of historical data and documents.
Findings
Soft strategies deployed by Chinese pawnbrokers – such as interpretations, moral value advocacies and institutionalized arrangements – contributed substantially to improving pawnbroking’s image and business legitimacy.
Research limitations/implications
Interconnections among ethical values, image, business legitimacy and select marketing strategies are clarified. The efficacy of historically analyzing previously implemented business strategies and their embedding contexts is discussed.
Practical implications
Strategies Chinese pawnbrokers used to mitigate their previously negative image and boost their business legitimacy suggest strategies current socially disapproved companies can use to improve their image and business legitimacy.
Originality/value
A historical analysis of pre-1949 Chinese pawnbroking can suggest soft marketing strategies for overcoming consumers’ negative company and industry impressions.
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Sonia Pervaiz, Amjad Ali and Muhammad Asif
Emotional intelligence (EI) is crucial to determine the emotional labor (EL) strategies and satisfaction of teachers. The purpose of this paper is to investigate the relationships…
Abstract
Purpose
Emotional intelligence (EI) is crucial to determine the emotional labor (EL) strategies and satisfaction of teachers. The purpose of this paper is to investigate the relationships of EI with EL strategies, emotional exhaustion and teaching satisfaction (TS) of secondary teachers in private schools.
Design/methodology/approach
A self-administered questionnaire was used to collect data conveniently from 322 secondary teachers working in 22 private schools.
Findings
Results indicate that teachers’ EI positively affect surface acting, expression of naturally felt emotions (ENFE) and TS. Surface acting and ENFE are positively related with TS. Deep acting and ENFE exhibit positive relations with emotional exhaustion of teachers. The study also confirms direct as well as indirect effects of EI on TS through surface acting and ENFE.
Practical implications
This study recommends teachers to make a higher use of surface acting and ENFE because they produce the most TS and the least emotional exhaustion.
Originality/value
This is the first study that examines the mediating role of EL strategies for EI and TS.
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Lan Song, Yang Zhao, Yaoming Zhou and Haifei Xiang
The purpose of this paper is to analyze and figure out the temperature field and thermal stress field with the calculation model of thermal insulation material and composite…
Abstract
Purpose
The purpose of this paper is to analyze and figure out the temperature field and thermal stress field with the calculation model of thermal insulation material and composite material.
Design/methodology/approach
The paper adopted the three-dimensional finite element algorithm.
Findings
The simulated results showed great shearing strength between the chipset and the printed circuit board. The position of chip exerts great influence on the distribution of temperature field and thermal stress field of circuit board. The reasonable distribution of chip will effectively reduce the temperature extremum and stress extremum of circuit board.
Originality/value
The paper analyzes and presents a discussion of the problems relating to the density of electronic packaging. The analysis process and the method of the paper provide essential help in resolving electronic device heat problems.
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Chang Yuan, Xinyu Wu, Donghai Zeng and Baoren Li
To solve the problem that the underwater vehicles is difficult to turn and exit in a small range in the face of complex marine environment such as concave and ring under the…
Abstract
Purpose
To solve the problem that the underwater vehicles is difficult to turn and exit in a small range in the face of complex marine environment such as concave and ring under the limitation of its limitation of its shape and maximum steering angle, this paper aims to propose an improved ant colony algorithm based on trap filling strategy and energy consumption constraint strategy.
Design/methodology/approach
Firstly, on the basis of searching the global path, the disturbed terrain was pre-filled in the complex marine environments. Based on the energy constraint strategy, the ant colony algorithm was improved to make the search path of the underwater vehicle meet the requirements of the lowest energy consumption and the shortest path in the complex obstacle environment.
Findings
The simulation results showed that the modified grid environment diagram effectively reduced the redundancy search and improved the optimization efficiency. Aiming at the problem of “the shortest distance is not the lowest energy consumption” in the traditional path optimization algorithm, the energy consumption level was reduced by 26.41% after increasing the energy consumption constraint, although the path length and the number of inflection points were slightly higher than the shortest path constraint, which was more conducive to the navigation of underwater vehicles.
Originality/value
The method proposed in this paper is not only suitable for trajectory planning of underwater robots but also suitable for trajectory planning of land robots.
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Raminderpreet Kaur and Gurpreet Randhawa
The purpose of this paper is to investigate the role of employee engagement and work–life balance in perceived supervisor support and turnover intentions relationship.
Abstract
Purpose
The purpose of this paper is to investigate the role of employee engagement and work–life balance in perceived supervisor support and turnover intentions relationship.
Design/methodology/approach
The perception of teachers on the constructs considered has been assessed by a survey using a structured questionnaire. Data were collected from the teachers of private schools of Punjab, India, and 375 were valid number of responses. Parallel multiple mediated regression was used to estimate the direct and indirect effects of perceived supervisor support on turnover intentions mediated through employee engagement and work–life balance.
Findings
The results reveal that the effect of perceived supervisor support on turnover intentions is indirect rather than direct. On the comparison of specific indirect effects, the results demonstrate that employee engagement and two dimensions of work–life balance (work interference with personal life and work–personal life enhancement) act as mediators in the perceived supervisor support and turnover intentions relationship.
Practical implications
School principals need to draft teacher-friendly policies for enhancing work–life balance and employee engagement so that teachers can feel satisfied with their work and can handle work and family demands. In this way, positive perceptions associated with high engagement and work–family balance can take place, which in turn can curtail the turnover intentions of teachers.
Originality/value
The use of employee engagement and work-life balance in the relationship of perceived supervisor support and turnover intentions is unprecedented. The study also considered three different dimensions of work–life balance and tested the model in an integrative manner. Since the study is based on an Indian sample, it also adds to growing literature on turnover intentions in nonwestern countries. The results are of great value to school managements, HR managers and policymakers who are seeking to develop practices that reduce employee turnover at workplaces.
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