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582 results on '"Liu, Pingsheng"'

11. Apolipoprotein A-IV and its derived peptide, T55−121, improve glycemic control and increase energy expenditure

Author

Cao, Zhen, primary, Lei, Lei, additional, Zhou, Ziyun, additional, Xu, Shimeng, additional, Wang, Linlin, additional, Gong, Weikang, additional, Zhang, Qi, additional, Pan, Bin, additional, Zhang, Gaoxin, additional, Yuan, Quan, additional, Cui, Liujuan, additional, Zheng, Min, additional, Xu, Tao, additional, Wang, You, additional, Zhang, Shuyan, additional, and Liu, Pingsheng, additional

Published
2024
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15. The cause and the evolution of "lens" structure for terahertz signals in hypersonic plasma sheaths.

Author

Peng, Kunpeng, Yuan, Kai, Mao, Mingyang, Zhao, Ziyang, Liu, Pingsheng, Cheng, Yuxin, and Mao, Ruiting

Subjects
REFRACTIVE index, ANTENNAS (Electronics), SPACE vehicles, ELECTRONS
Abstract

Reentry vehicles in near space used to suffer from communication blackout, which is led by the plasma sheath enveloping the whole reentry vehicle. Terahertz (THz) communication is believed to be a potential solution to mitigate the communication blackout effectively. Previous studies have investigated the attenuation characteristics of THz signals in plasma sheaths. However, the offset of THz signal transmission direction by the plasma sheath has rarely been a concern. In this study, the auto-evolution of the plasma sheath is taken into account. The consequent evolution of the refraction index distribution of the plasma sheath is investigated. It is found that the plasma sheath acts as a gradient index lens to the propagating THz signals. The lens structure keeps evolving due to the evolution of the plasma sheath itself. The main mechanism that dominates the evolution of the lens structure is the convection of electrons. By analyzing the offset of the transmission direction yielded by the lens structure, it is suggested that the onboard THz antenna could be installed close to the bottom of the vehicle in order to stabilize the transmission direction of THz signals in an evolving plasma sheath. [ABSTRACT FROM AUTHOR]

Published
2024
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16. "Equal Emphasis on Agriculture and Commerce," "Overseas Trade," and "Smithian Growth": The Economic Characteristics and Historic Significance of the Southern Song Development Path.

Author

LIU Pingsheng and GE Jinfang

Abstract

The "Southern Song development path" is the economic model formed during the flourishing development of industry and commerce civilization in the South of the lower reaches of the Yangtze River during the Southern Song Dynasty. It has three characteristics: "equal emphasis on agriculture and commerce," "overseas trade," and "Smithian Growth." This economic model was formed with the support of several historical conditions, such as the strong industrial foundation, convenient transportation, remarkable technological progress, and rich human resource in that time. This model indicates that the operating mechanism of ancient China's economy had undergone significant changes, especially from relying mainly on agriculture to both agriculture and handicrafts and commerce, since then, market mechanisms played an increasingly important role. It also shows the primary path and ideal direction of China's economy in the Yuan, Ming, and Qing dynasties. Therefore, it is of great historic significance. [ABSTRACT FROM AUTHOR]

Published
2024
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37. Analysis on the Propagation Characteristics of Terahertz Signals in Blunt-Coned and Sharp-Coned Vehicle in Different Sizes

Author

Liu, Pingsheng, Zhao, Ziyang, Yuan, Kai, Chu, Zhikang, and Tang, Rongxin

Abstract

In the recent decade, Terahertz (THz) communication has been recognized as one of the possible paths to solve the communication blackout for reentry vehicles. Previous studies have mainly focused on the plasma structure and Terahertz signal propagation mechanisms of vehicle of the same model. However, actual vehicle comes in various sizes, necessitating further research into the relationship between different-sized vehicle and Terahertz signal transmission characteristics. This study takes typical RAM-C blunt-coned and pointed-coned vehicles as objects to analyze the impact of vehicle size changes on plasma sheath parameters. The propagation characteristics of Terahertz signals in plasma sheaths of different sizes were studied using the scattering matrix method (SMM) method. The analysis conclusion indicates that as the size of blunt-coned and sharp-coned vehicles increases, the thickness of the plasma sheath layer also increases, resulting in more severe attenuation of Terahertz signals. Increasing the size of the vehicle enhances electron collision frequency, while the fluctuation in maximum electron density increases with the size of blunt-coned vehicle and decreases with the size of sharp-coned vehicle. In the Terahertz signal transmission characteristics, blunt-coned vehicles are mainly affected by signal absorption, while sharp-coned cone vehicles are affected by both reflection and absorption. Reducing the size of the vehicle and the thickness of the plasma sheath layer can mitigate Terahertz signal attenuation.

Published
2024
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47. Regional differential decomposition and the formation mechanism of the dynamic carbon emissions efficiency of industrial energy in China

Author

Li, Xiaoye, Tang, Yixuan, Liu, Pingsheng, and Cheng, Zhengrong

Subjects
General Environmental Science
Abstract

Industrial carbon emissions efficiency requires a balance between economic development and carbon reduction to be achieved through structural adjustment and technological change, which is the key to low-carbon economic development and the essence of China’s carbon reduction commitment. Existing research has focused more on static carbon emission efficiency and provides insufficient analysis of the internal causes of inter-regional differences in carbon emission efficiency. This paper aims to fill this gap in the existing research. The data of 30 provinces in China, obtained from the Chinese Official Statistical Yearbook, were taken as the sample. We accurately measured the dynamic carbon emission efficiency of industrial energy (DCEEIE) in China by combining the three-stage slacks-based measure data envelopment analysis (SBM-DEA) model and the Malmquist-Luenberger model. This study further uses Dagum’s Gini coefficient decomposition and the panel vector auto regression (PVAR) model to empirically estimate regional differences in DCEEIE and the effects of its internal structure. The results show, first, that DCEEIE in China is increasing, and that overall energy efficiency is at a high level. Although both efficiency change and technological change are fundamental to efficiency, an attenuation of efficiency and a diffusion of technology are evident. Second, the total Gini coefficients of dynamic efficiency, efficiency change (EC), and technological change (TC) are all decreasing; regional differences and transvariation intensity are the main reasons for long-term gaps. Third, TC improves dynamic efficiency in the initial stages, but the main driving force in the long run is EC. The limitation of this paper is that we do not fully discuss the external factors which might impact TC and EC, nor do we continue the discussion on how to transform the energy mix by improving carbon efficiency, which is the future direction for green development. These issues represent avenues for future research.

Published
2022

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