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
Malin Song, Xiongfeng Pan, Xianyou Pan and Zhiming Jiao
The purpose of this paper is to add to the existing research about how corporate performance is influenced by their basic research (BR) investment. On this basis, the authors…
Abstract
Purpose
The purpose of this paper is to add to the existing research about how corporate performance is influenced by their basic research (BR) investment. On this basis, the authors examined the moderating effect of human capital structure (HCS) on the relationship between BR investment and corporate performance.
Design/methodology/approach
Hypotheses were tested using static and dynamic models to analyze a large-scale data of Chinese A-share listed companies.
Findings
This study provides empirical evidence that contributes to the research about how private BR investment influences corporate performance in the digital age. In addition, human resource is an important dynamic ability for enterprise development. Based on the dynamic capability theory, further research finds that the human resources practice on the knowledge stock can enhance the company’s dynamic capability, thereby enhancing the company’s core competitiveness.
Research limitations/implications
The results may be affected by the context of the data set. This study considers the influence of private research investment type on corporate performance, further studies considering the influence of specific contextual variables, such as corporate industry differences, could yield richer insights that would help validate the results of this study.
Practical implications
This study provides useful information for managers. As well as increasing the investment in the BR of enterprise and creating the necessary conditions to increase the competitiveness of enterprise, they should strive to adjust the structure and quality of researchers involved in BR projects.
Originality/value
This research contributes to the enterprise’s BR investment and the management of human capital resource. It points that the investment of BR positively influences the corporate performance. In addition, the increasing of high-skilled labor’s proportion positively promotes the promotion of BR investment on corporate performance.
Details
Keywords
Xiongfeng Pan, Xianyou Pan, Changyu Li, Jinbo Song and Jing Zhang
The purpose of this paper is to analyze the effect of environmental policy China’s national program to address climate change on carbon emission efficiency.
Abstract
Purpose
The purpose of this paper is to analyze the effect of environmental policy China’s national program to address climate change on carbon emission efficiency.
Design
Based on the directional distance function, the provincial total factor carbon emission efficiency was measured. Then, the authors analyzed the effect of environmental policy on carbon emission efficiency based on a difference in difference model.
Finding
Carbon emission efficiency has been significantly improved since the environmental policy China’s national program to address climate change was put forwarded, but the positive impact in different periods and regions is different. In addition, the environmental policy improves the carbon emission efficiency through the reduction of energy intensity and adjustment of the industrial structure.
Originality/value
This is the first time to use difference in difference model to use a difference in difference model to quantitatively assess the influence of environmental policy China’s national program to address climate change on carbon emission efficiency.