scholarly journals Ecological efficiency evaluation and spatial evolution in Bohai Rim region

2019 ◽  
Vol 34 (1) ◽  
pp. 104
Author(s):  
Mei GAI ◽  
Chen NIE
Keyword(s):  
Efficiency Evaluation ◽  
Spatial Evolution ◽  
Ecological Efficiency ◽  
Bohai Rim

scholarly journals Emergy Based Ecological Efficiency Evaluation and Optimization Method for Logistics Park

2021 ◽  
Author(s):  
Cui Wang ◽  
Cuixia Zhang ◽  
Fagang Hu ◽  
Yuan Wang ◽  
Li’e Yu ◽  
...  
Keyword(s):  
Sustainable Development ◽  
Evaluation Model ◽  
Rapid Development ◽  
Correlation Coefficients ◽  
Optimization Method ◽  
Fuel Oil ◽  
Efficiency Evaluation ◽  
Ecological Efficiency ◽  
Logistics Park ◽  
Waste Gas

Abstract The rapid development of the economy and the change in transaction mode has promoted the development of logistics parks. How to evaluate and optimize the ecological efficiency of logistics park to achieve its sustainable development has been considered a challenge. Therefore, this paper puts forward an emergy based ecological efficiency evaluation and optimization method for Logistics Park. By constructing the ecological efficiency evaluation model of logistics park, it quantitatively evaluates the ecological efficiency and sustainable development of logistics park, and analyzes the correlation between various factors and ecological efficiency. The application results of H Logistics Park show that fuel oil, information technology, net profit, and waste gas are closely related to the ecological efficiency of logistics park, and the correlation coefficients are 0.8248, − 0.6949, 0.8544 and 0.7661 respectively. On this basis, the paper puts forward some suggestions to improve the ecological efficiency of the logistics park. This paper provides theoretical and methodological support for the evaluation and optimization of the ecological efficiency of the logistics park.

scholarly journals Emergy-based ecological efficiency evaluation and optimization method for logistics park

2021 ◽  
Author(s):  
Cui Wang ◽  
Cuixia Zhang ◽  
Fagang Hu ◽  
Yuan Wang ◽  
Li’e Yu ◽  
...  
Keyword(s):  
Optimization Method ◽  
Efficiency Evaluation ◽  
Ecological Efficiency ◽  
Logistics Park

Space and Time Distribution of Hard X-Ray Emission in a Loop at the Beginning of a Flare

1994 ◽  
Vol 144 ◽  
pp. 275-277
Author(s):  
M. Karlický ◽  
J. C. Hénoux
Keyword(s):  
Time Distribution ◽  
Electron Bombardment ◽  
Spatial Evolution ◽  
Superthermal Electrons ◽  
Flare Loop ◽  
X Ray ◽  
Superthermal Electron ◽  
Flare Loops ◽  
Chromospheric Evaporation ◽  
Temporal And Spatial

AbstractUsing a new ID hybrid model of the electron bombardment in flare loops, we study not only the evolution of densities, plasma velocities and temperatures in the loop, but also the temporal and spatial evolution of hard X-ray emission. In the present paper a continuous bombardment by electrons isotropically accelerated at the top of flare loop with a power-law injection distribution function is considered. The computations include the effects of the return-current that reduces significantly the depth of the chromospheric layer which is evaporated. The present modelling is made with superthermal electron parameters corresponding to the classical resistivity regime for an input energy flux of superthermal electrons of 109erg cm−2s−1. It was found that due to the electron bombardment the two chromospheric evaporation waves are generated at both feet of the loop and they propagate up to the top, where they collide and cause temporary density and hard X-ray enhancements.

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