Xiongfeng Zhu, Zheng Guo, Zhongxi Hou, Xianzhong Gao and Juntao Zhang
The purpose of this study is to present a methodology for parameters’ sensitivity analysis of solar-powered airplanes.
Abstract
Purpose
The purpose of this study is to present a methodology for parameters’ sensitivity analysis of solar-powered airplanes.
Design/methodology/approach
The study focuses on a preliminary design and parameters’ relations of a heavier-than-air, solar-powered, high-altitude long-endurance unmanned aerial vehicle. The methodology is founded on the balance of energy production and requirement. An analytic expression with four generalized parameters is derived to determine the airplane flying on the specific altitude. The four generalized parameters’ sensitivities on altitude are then analyzed. Finally, to demonstrate the methodology, a case study is given on the parameters’ sensitivity analysis of a prototype solar-powered airplane.
Findings
When using the presented methodology, the nighttime duration and the energy density of batteries are more sensitive on flight altitude of the prototype airplane.
Practical implications
It is not easy to design a solar-powered airplane to realize high-attitude and long-endurance flight. For the current state-of-art, it is a way to figure out the most critical parameters which need prior consideration and immediate development.
Originality/value
This paper provides an analytical methodology for analyzing the parameters’ sensitivities of solar-powered airplanes, which can benefit the preliminary design of a solar-powered airplane.
Details
Keywords
Jun Hu, Wenbin Long, Xianzhong Song and Taijie Tang
Due to environmental externalities, micro-enterprises with profit-seeking features do not develop sufficient motivation for environmental governance. In a fiscally decentralized…
Abstract
Purpose
Due to environmental externalities, micro-enterprises with profit-seeking features do not develop sufficient motivation for environmental governance. In a fiscally decentralized system, local environmental protection authorities perform environmental supervision, and the intensity of the regulations that they implement has an important influence on corporate environmental governance. Based on the promotion tournament framework, this paper aims to discuss the driving mechanism of corporate environmental governance using turnover of environmental protection department directors (EPDDs) as an indicator.
Design/methodology/approach
Using samples of A-share companies listed on the Shanghai and Shenzhen exchanges from 2007 to 2014, this paper examines the impact of EPDD turnover on corporate environmental governance and its underlying mechanism.
Findings
The results show that corporate environmental governance exhibits a political periodicity that changes with the turnover of the EPDD, and the periodicity remains after controlling for the influence of changes in provincial party secretary and governor. Internal mechanisms analysis indicates that, without financial independence, local environmental protection departments rely on increasing sewage charges, not environmental protection subsidies, to promote corporate environmental governance. Further, considering heterogeneity among officials, it finds that the younger a new EPDD is, the more pronounced the periodicity of corporate environmental governance. However, there is no significant difference between in-system and out-system turnover.
Originality/value
In general, this paper describes the mechanisms of corporate environmental governance from the perspective of political economics, and the results have implications for the potential improvement of the government’s environmental supervision functions and the development of ecological civilization in China.
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Keywords
Zhao Duan, Yajuan He and Yuan Zhong
Based on the text mining tools, this paper aims to propose a new method to evaluate the subjectivity and objectivity of corporate social responsibility information disclosure.
Abstract
Purpose
Based on the text mining tools, this paper aims to propose a new method to evaluate the subjectivity and objectivity of corporate social responsibility information disclosure.
Design/methodology/approach
The authors build up a text subjectivity evaluation model of corporate social responsibility reports through meta-analysis; a text mining is conducted to all sample CSR reports released by Chinese listed companies untill March 2016[1]. Furthermore, the authors made an overall and quantitative analysis of the situation which contained changing state, characteristics and abnormal value on the subjectivity and objectivity of information disclosure.
Findings
The results show that the subjectivity scores of social responsibility reports of Chinese listed companies are generally in a normal distribution. The diagram turns out to be a rising trend over the years and increases linearly from 2011 to 2013. Also, the industry heterogeneity and policy control are the main reasons for the formation of the differences, which are significant between different industries and different years.
Originality/value
This paper provides not only an important empirical basis for the research of corporate social responsibility but also a new idea for the non-financial information disclosure as well as objective evaluation of normative text.
Details
Keywords
Xin Feng, Xu Wang and Mengxia Qi
In the era of the digital economy, higher demands are placed on versatile talents, and the cultivation of students with innovative and entrepreneurial abilities has become an…
Abstract
Purpose
In the era of the digital economy, higher demands are placed on versatile talents, and the cultivation of students with innovative and entrepreneurial abilities has become an important issue for the further development of higher education, thus leading to extensive and in-depth research by many scholars. The study summarizes the characteristics and patterns of dual-innovation education at different stages of development, hoping to provide a systematic model for the development of dual-innovation education in China and make up for the shortcomings.
Design/methodology/approach
This paper uses Citespace software to visualize and analyze the relevant literature in CNKI and Web of Science databases from a bibliometric perspective, focusing on quantitative analysis in terms of article trends, topic clustering, keyword co-linear networks and topic time evolution, etc., to summarize and sort out the development of innovation and entrepreneurship education research at home and abroad.
Findings
The study found that the external characteristics of the literature published in the field of bi-innovation education in China and abroad are slightly different, mainly in that foreign publishers are more closely connected and have formed a more stable ecosystem. In terms of research hotspots, China is still in a critical period of reforming its curriculum and teaching model, and research on the integration of specialization and creative education is in full swing, while foreign countries focus more on the cultivation of students' entrepreneurial awareness and the enhancement of individual effectiveness. In terms of cutting-edge analysis, the main research directions in China are “creative education”, “new engineering”, “integration of industry and education” and “rural revitalization”.
Originality/value
Innovation and entrepreneurship education in China is still in its infancy, and most of the studies lack an overall overview and comparison of foreign studies. Based on the econometric analysis of domestic and foreign literature, this paper proposes a path for domestic innovation and entrepreneurship education reform that can make China's future education reform more effective.