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Impact of Lead Market on Transition Towards New Energy Technology in Automobile Industry in China
GAO Jian, TONG Xin, HE Canfei
Acta Scientiarum Naturalium Universitatis Pekinensis    2023, 59 (4): 671-680.   DOI: 10.13209/j.0479-8023.2023.037
Abstract167)   HTML    PDF(pc) (770KB)(93)       Save
This paper takes Chinese automobile industry as an example, and analyzes the technological transition towards new energy under the combined effects of market, policy and local cluster. The aim is to study the influencing factors of enterprises’ green technology adoption with a framework based on lead market theory. The results show that target market is an important driving force for enterprises to adopt new energy technology. But unlike the electronics and other export-oriented products, the enterprises of the automobile supply chain is mainly driven by the domestic market. The demand-side incentive policies through subsidies to new energy vehicle buyers are not sustainable, while the supply-side policies, such as the policy targeting close-loop supply chains for circular economy, have long-term effects on the adoption of new energy technology of enterprises. The enterprises are highly dependent on the technology diffusion of local traditional automobile industry clusters, while collaborative innovation among local new energy automobile enterprises needs to be further strengthened. In conclusion, the synergy of circular economy and low carbon development can be achieved through local collaboration within the industrial cluster in building the sustainable competitiveness for Chinese new energy automobile industry.
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Treatment and Reuse of Highly Concentrated Cutting Fluid Wastewater by Decompression-Dehydration-Drying System
FAN Yi, ZOU Zhendong, LI Ruili, WU Xiaofang, QIU Guoyu, NAKAMURA Kazuhiko, GAO Jian
Acta Scientiarum Naturalium Universitatis Pekinensis    2018, 54 (6): 1267-1275.   DOI: 10.13209/j.0479-8023.2018.069
Abstract912)   HTML    PDF(pc) (2456KB)(178)       Save

A decompression-dehydration-drying system was designed and improved to deal with cutting fluid wastewater produced during metal processing. The results show that the removal rate of total suspended solids is more than 99.38%, and the average removal rates of n-HEX, BOD5, CODMn, total nitrogen, total phosphorus, copper and zinc are 99.07%, 96.67%, 98.64%, 81.28%, 99.33%, 98.69% and 99.79% respectively. Combined with ozone treatment it can further improve the removal rate of organic pollutants. Compared with other treatment methods, during the process of sewage treatment, the proposed system produces very little smell and noises, and do not need a large number of chemical agents, and has a small footprint and low cost. It is especially fit for the treatment of highly concentrated cutting fluid wastewater.

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A Study on the Long-Term Correlation of Cloud Amount
GAO Jianhua,XUE Huiwen
Acta Scientiarum Naturalium Universitatis Pekinensis   
Abstract823)            Save
The authors use the detrended fluctuations analysis (DFA) to analyze the ISCCP cloud amount data at four locations: Beijing, Shanghai, Western Pacific, and Eastern Pacific. It is found that cloud amount indeed has power-law correlation in large time scales, which indicates that the cloud amount has strong long-term correlation in the locations studied. The crossover over the ocean appears later than that over the continent.The long-term correlation of the the cloud amount over the Western Pacific is stronger than the Eastern Pacific’s.
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Accounting and Analyzing Eco-economic SystemUsing a Modified Emergy-Based Ecological Footprint Model : A Case Studyin Guangdong Province (1978-2006)
ZHAO Zhiqiang,GAO Jiangbo,LI Shuangcheng,WANG Yanglin
Acta Scientiarum Naturalium Universitatis Pekinensis   
Abstract590)            Save
By using a modified emergy-based ecological footprint model, the authors accounted and analyzed the changing processes of the per capita consumption ecological footprint and local output ecological carrying capacity in Guangdong Province from 1978 to 2006. Growth trend was found in both processes, and the growth rate of the output carrying capacity was higher than consumption ecological footprint. The authors researched the structural characteristics and trends of consumption ecological footprint and local output ecological carrying capacity accordingto the different accounts of biological resources, energy resources, industry, human resource and trade respectively. The growth of the non-biological resources consumption footprint was the most important part of the growth of total consumption, while the growth of product output carrying capacity also benefited from the second major industrial development. Extensive trade and the continuous improvement of human resources since reform and opening up policy were the major reasons for continuous improvement of carrying capacity in Guangdong Province.
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Evaluating the Ecological Service Function of Soil Conservation Based on RUSLE and GIS
GAO Jiangbo,ZHOU Qiaofu,CHANG Qing,LI Shuangcheng
Acta Scientiarum Naturalium Universitatis Pekinensis   
Abstract578)            Save
Under the support of GIS technique, the authors evaluated the capital stocks of the ecosystem's soil conservation with a case study in Beijing, Tianjin and Hebei Province. On the basis of the data of daily rainfall, NDVI, DEM, LUCC, and soil types of the study area, according to the Revised Universal Soil Loss Equation, the maximum amount of potential soil erosion and its actual quantities were calculated. The deviation between them was the conserved amount, which was converted into capital stocks with the methods of Shadow Price and Market Price. The result show that the value of the soil conservation in the study area was about 176.832 billion RMB yuan, which approximately equaled to the 21.41 percent of the total GDP in 2000, of which the preserved nutrient was about 167.797 billion RMB yuan and the alluvial bedload was 9.035 billion RMB yuan respectively. The contributing percent of individual ecosystems was as follows: the forest occupies 44.34%, cropland 44.91%, grassland and water 10.75%.
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