Search scope:
排序： Display mode:
The Impact of Cropland Spatial Pattern Change on Grain Production in China
Li Yuanyuan, Tan Minghong, Zhang Hongqi
Strategic Study of CAE 2018, Volume 20, Issue 5, Pages 90-95 doi: 10.15302/J-SSCAE-2018.05.014
Cropland is the basis of grain production. In recent decades, the spatial pattern of cropland in China has changed significantly, which has caused some impact on grain production. Based on land cover data of 1990, 2000, and 2010, this study explored changes in the spatial pattern of cropland, and constructed a database with a spatial resolution of 1 km based on county-level agricultural statistics and soil organic matter data, which is the representative of crop productivity. The results show that: during the period from 1990 to 2010, drastic reclamation happened in Northeast and Northwest China while the cropland acreage decreased in Huang-Huai-Hai Plain; the main source of new cropland during the study period was grassland (46.9%), and the lost cropland was mainly converted to forest land (36.6%) in the first ten years and then to construction land (53.0%) in the following ten years; the changes in the spatial pattern of cropland have caused a decrease of 2.0% in the average crop productivity, and during this period, the construction land mostly occupied high-quality cropland, while the newly reclaimed cropland had lower crop productivity.
Keywords： 耕地是粮食生产的基础，近几十年来中国耕地空间格局变化显著，对粮食生产造成一定影响。本研究以1990 年土地覆被数据为基础，探究耕地空间格局变化，并基于县级农业统计数据和土壤有机质数据得到空间分辨率为1 ，在此期间建设用地多占用优质耕地，而新开垦的耕地粮食生产力普遍较低。
Rangeland Productivity in China
Hou Fujiang,Wang Chunmei,Lou Shanning,Hou Xiangyang and Hu Tianming
Strategic Study of CAE 2016, Volume 18, Issue 1, Pages 80-93 doi: 10.15302/J-SSCAE-2016.01.011
Through analyzing the plant production and animal production of grassland in China and comparing the grassland productivity at home and abroad, the author finds that, in the past over 30 years, the grass production of grassland declined slightly in some regions of China. Among the global animal products, 40.08% came from the world's grassland and 67.35% was from middle income countries. 24.1% of the global beef production and 31.9% of the global mutton production were supported by grassland. The grazing capacity of the grassland of low income countries was 87.4% higher than that of high income countries and 66.4% higher than that of middle income countries. However, their output of animal products respectively accounts for 37.3% and 71.9% of that of high and middle income countries. With appropriate grazing utilization, the productivity of grassland in China can reach 6.35×109 APU. The meat production from animal grazing grassland can reach 2.959×106 t, accounting for 3.5% of the national meat production and 27.4% of the national beef and mutton production. After the transformation of modernization of grassland animal husbandry, China's grassland productivity will be close to that of high income countries with a potential increase of about 50%–200%.
Keywords： grassland productivity grass production grazing grazing capacity animal product unit (APU)
Theory and practice of turning R & D results into productive force in major equipment
Zhang Xiaolu
Strategic Study of CAE 2011, Volume 13, Issue 8, Pages 50-54
Starting with the characteristics of technological R & D and project application in power generating companies, this paper expounds on the theoretical analysis and organizational methods of turning R & D results into productive force in major equipment. Faced with the widespread problem that putting R & D results into application is both lengthy and difficult, the author proposes the mechanism of "joint work among industry, college, research institute and user under the users' leadership"; puts forth the thought for major equipment R & D management that features "oriented by commercialization of demonstration project, premised on the responsibility system for project management, unite advantageous parties nationwide to make joint efforts with enterprises taking the overall responsibility and research institutes providing support," and explores the mode to promote R & D results with "R & D and promotion in parallel". In this paper, two case studies are used to illustrate the effects of such a management mode of scientific researches. "Ultra super-critical coal-fired power generation technology" is widely applied to power development, and has become the priority choice in newly built large coal-fired power plants in China.The project named "R & D and project demonstration of air-cooling system in thermal units" solves the water-saving issue of power plants in northern China. The problems in the ownership of research results, reward application and result ratification were analyzed, and some corresponding suggestions were put forward.
Keywords： R & D major equipment joint work of industry， college and research institute transformation of results managemen
Water Resource Effectiveness of Vegetation Conservation and Restoration in North China
Sun Siqi,Chen Yongzhe,Wang Cong,Hu Qingfang,Lyu Yihe
Strategic Study of CAE 2022, Volume 24, Issue 5, Pages 97-106 doi: 10.15302/J-SSCAE-2022.05.012
In recent years, a series of ecological protection and restoration projects has been implemented in North China, and the vegetation conditions have changed significantly. Exploring the impact of regional vegetation restoration on the water circulation process and the balance of water supply and demand is important for improving ecological restoration strategies and realizing the sustainable utilization of regional water resources. This study conducted a comprehensive analysis using the Pearson correlation coefficient and Moran’s I index and based on multi-source water covariate data. The spatial and temporal variation of vegetation and different water covariates is analyzed, the water resource effects of vegetation conservation and restoration are identified, and the tradeoff between water resources and vegetation restoration is discussed. The results show that the effects of ecological protection and restoration projects are remarkable, with the net primary productivity increasing at a rate of approximately 2.3 times faster than that outside the project area; the vegetation expansion and evapotranspiration show strong spatial and temporal correlations; and the increase in evapotranspiration owing to vegetation restoration is the main reason for the deficit or significant reduction in water storage. Therefore, it is necessary to improve the implementation strategy of ecological restoration while considering the restriction of water resources on vegetation conservation and restoration, strengthen the dominant position of the ecosystem’s own resilience, and promote the sustainability of vegetation restoration and the sustainable use of regional water esources.
Keywords： North China ecological restoration projects evapotranspiration water storage net primary productivity atural restoration
Reconstructing Human‒Coal Space Relationship Through Coalmine Intellectualization
Fan Jingdao, Jin Zhixin, Wang Guofa, Li Chuan, Liu Wei, Yan Zhenguo
Strategic Study of CAE 2023, Volume 25, Issue 2, Pages 243-253 doi: 10.15302/J-SSCAE-2023.07.014
The human‒coal space relationship is significant for the safe and efficient production of coalmines. Reconstructing the human‒coal space order using intelligent technologies in coalmines will provide a core technical support for the high-quality development of the coal industry. This study examines the evolution and research progress of the human‒coal space relationship and proposes a human‒physical‒information (HPC) space form to break constraints from the traditional human‒physical space structure of coalmines. We find that coalmine intellectualization can change the physical locations and relative motions of coalmine production factors; it can reconstruct the three major factors of production, establish an integrated intelligent production management mode, and improve the development space of miners’ social values, thereby achieving an interconnection-of-everything production scene and liberating human from underground mining. Moreover, the study analyzes intelligent coal-mining and intelligent well-construction cases and reveals the practical values of coal mine intellectualization for the change of the human‒coal space relationship. We suggest that a development mode integrating new-generation technologies and modern coalmines should be established based on the intelligent HPC space theory of coalmines and by targeting human liberation and comprehensive development. This will promote the safe, efficient, intelligent, and green development and thus the overall upgrading of the coal industry.
Keywords： coalmine intellectualization spatial relationship human‒physical‒information space virtual‒real fusion production factors
Current Situation and Future Security of Agricultural Water Resources in North China
Huang Feng, Du Taisheng, Wang Sufen, Mei Xurong, Gong Daozhi, Chen Yuanquan, Kang Shaozhong
Strategic Study of CAE 2019, Volume 21, Issue 5, Pages 28-37 doi: 10.15302/J-SSCAE-2019.05.024
North China is one of the major breadbaskets in China and is critical in ensuring food security of the nation. It sustained 18% of national total arable land, and 23% of national total grain crop output using only 6% of national total water resources. However, such impressive accomplishments were achieved at huge costs incurred in resources, environment, and ecosystem. We first presented accomplishments, current situations, and main challenges facing agriculture and water use in North China. Then, using an integrated framework in agricultural water management widely adopted by international water research communities, we reviewed the trajectory of agricultural development and its associated water withdrawal, water use efficiencies, and productivities in North China from 1998 to 2015, from which some major experiences and lessons were derived. We then tentatively proposed policy and strategy pathways to ensure food security in North China in the future.
Keywords： food security agricultural water use water use efficiency crop water productivity
The Skyscraper Crop Factory: A Potential Crop-Production System to Meet Rising Urban Food Demand Perspective
Li Zhang, Lan Huang, Tao Li, Tao Wang, Xiao Yang, Qichang Yang
Engineering 2023, Volume 31, Issue 12, Pages 70-75 doi: 10.1016/j.eng.2023.08.014
Vertical farming systems, such as sky farms, are a potential type of agricultural system for stable and effective food production. Here, we highlight the potential of the sky farm, denoted as the “skyscraper crop factory” (SCF), for cereal crop production and discuss some nascent technologies that would be applied in this production system. SCFs are ideal crop-production systems for increasing the effective arable area for crops and ensuring food security in times of crises that cause a shock in global trade. They can also provide food in urban areas to meet producers’ and consumers’ demands for the increased nutrition, taste, and safe production of cereal crops. Moreover, as their use can reduce greenhouse gas emissions, SCFs could be a sustainable addition to conventional agricultural crop production.
Keywords： Vertical farming system Cereal crop production Plant factory technology Skyscraper crop factory
Strategies for Soil Fertility Improvement of Arable Land in China
Yingjie Hu, Xiangbin Kong, Yuzhen Zhang
Strategic Study of CAE 2018, Volume 20, Issue 5, Pages 84-89 doi: 10.15302/J-SSCAE-2018.05.013
This paper systematically reviews the trends of soil fertility of arable land in China and puts forwards that the soil fertility improvement of arable land in China should realize the strategic change from single application of chemical fertilizer to the combined application of organic and inorganic fertilizers, combine cultivation with preservation to maintain soil fertility, and implement spatial differentiation control. Moreover, this paper summarizes the ways to improve the soil fertility of arable land in China, including increasing the application of organic fertilizer, promoting straw returning to the field, resuming and promoting green manure cultivation, improving the farming conditions, and optimizing the layout of agroforestry networks. At last, this paper proposes policy suggestions of implementing high-standard farmland construction projects, soil improvement and restoration projects, grass-crop rotation projects, straw returning projects, and livestock and poultry manure application projects.
Keywords： 保持土壤肥力，应实行空间差异化管控的战略思路，总结出增施有机肥、推广秸秆还田、恢复推广绿肥种植以及提升农田耕作条件和优化农田林网布局等耕地土壤肥力提升实现途径，提出了国家继续实施高标准农田建设工程、土壤改良修复工程 本文系统梳理了中国耕地土壤肥力变化态势，提出我国耕地土壤肥力提升应实现从单一施用化肥向有机无机肥相结合的战略转变，应
Coal to gas single cell protein-contribute to resolving the food crisis of China in future
Cao Chen,Yu Bo and Gu Weidong
Strategic Study of CAE 2015, Volume 17, Issue 3, Pages 107-112
It is predicted that the population of China will be growing to 1.45 billion， the urbanization rate will be 70 % by 2030， the total urban population will be exploded to 1 billion comparing with 0.7 billion urban population of 2013. As the continuously growing of population of China and urban population， China will face severe food crisis， especially the protein shortage problem in future. This paper presents a new theoretical model that by combining non-grid-connected wind power and coal to gas with bioengineering to produce single cell protein to contribute to resolving the food crisis. By combining non-grid-connected wind power and coal to gas with bioengineering to produce single cell protein can not only use the coal resource more efficiently， environmental friendly， but also produce nutrient rich protein for forage and human food.
Keywords： urbanization； food crisis； non-grid wind power； coal-to-gas； single cell protein
Development Strategy for Standardization System of Producer Services
Jin Zongzhen,Zhuang Lijian,Xiang Ning
Strategic Study of CAE 2021, Volume 23, Issue 3, Pages 25-31 doi: 10.15302/J-SSCAE-2021.03.012
A standardization system is important for the high-quality and integrated development of producer services. However, the standardization system of producer services in China still requires improvement regarding standards coverage, effective supply, and internationalization. Therefore, establishing a standardization system that is scientifically regulated, technologically advanced, and forward-looking becomes urgent for the producer services. In this article, we study the development trend of producer services standardization, analyze the development status of producer services standardization in China and abroad, and summarizes the problems faced by the construction of a producer services standardization system in the new era. Moreover, the development goals, key directions, and implementation paths of the producer services standardization system for 2025 and 2035 are proposed. To provide technical support for standardizing the economic system of China, the standardization system of producer services should be improved to satisfy the demand for high-quality development, standards for new service formats should be timely formulated, connection of standards systems between producer services and other industries should be promoted, standardization personnel should be cultivated, and standards internationalization should be encouraged.
Keywords： producer services standardization system standards internationalization
Research on the Strategy for Improving Cultivated Land Quality in China
Hongqi Zhang, Minghong Tan, Xiangbin Kong, Yongmei Xu, Erqi Xu, Erping Shang
Strategic Study of CAE 2018, Volume 20, Issue 5, Pages 16-22 doi: 10.15302/J-SSCAE-2018.05.003
Based on a systematic analysis of changes in quantity and quality of cultivated land in China, this paper put forward an overall strategic thinking of realizing three strategic transformations in the cultivated land management from the aspects of quantity, quality, and ecology of the cultivated land. Five important measures, including enhancing the cultivated land quantity in China, curbing undisciplined growth of construction land, improving the fertility of cultivated soil, preventing and controlling heavy metal pollution of soil, and preventing and controlling agricultural film pollution, were proposed. It was also recommended that four major projects, namely middle- and low-yield farmland reforms, comprehensive improvement of rural land, comprehensive reparation of heavy metal pollution of soil, and soil and water conservation, sand prevention, and saline soil improvement, should be implemented as soon as possible.
Keywords： cultivated land quality temporal and spatial change strategy major projects
Prediction of Food Consumption and Grain Demand in Chinese Mainland
Liangjie Xin
Strategic Study of CAE 2018, Volume 20, Issue 5, Pages 135-141 doi: 10.15302/J-SSCAE-2018.05.020
Now consumption of main food in Taiwan of China has been stable. It is most likely that Chinese Mainland will follow the progressive path of food consumption in Taiwan of China. The total dietary consumption of Chinese Mainland residents will reach the summit around 2026, so will the consumption of food with high added values, such as fruit, meat, egg, aquatic products, dairy products, and oil. Total dietary consumption will be 563 kg per capita, and grain consumption will be 456 kg per capita. The structure of dietary consumption will reach a table state by 2035, and total dietary consumption and grain consumption will be 499 kg per capita and 412 kg per capita, respectively. Dietary consumption of Chinese Mainland residents has great potentials for promotion, which will exert long and continuous pressure on China’s limited land and water resources.
Probing the Interfacial Forces and Surface Interaction Mechanisms in Petroleum Production Processes Review
Diling Yang,Xuwen Peng,Qiongyao Peng,Tao Wang,Chenyu Qiao,Ziqian Zhao,Lu Gong,Yueliang Liu,Hao Zhang,Hongbo Zeng,
Engineering 2022, Volume 18, Issue 11, Pages 49-61 doi: 10.1016/j.eng.2022.06.012
Despite the advances that have been made in renewable energy over the past decade, crude oil or petroleum remains one of the most important energy resources to the world. Petroleum production presents many challenging issues, such as the destabilization of complex oil–water emulsions, fouling phenomena on pipelines and other facilities, and water treatment. These problems are influenced by the molecular forces at the oil/water/solid/gas interfaces involved in relevant processes. Herein, we present an overview of recent advances on probing the interfacial forces in several petroleum production processes (e.g., bitumen extraction, emulsion stabilization and destabilization, fouling and antifouling phenomena, and water treatment) by applying nanomechanical measurement technologies such as a surface forces apparatus (SFA) and an atomic force microscope (AFM). The interaction forces between bitumen and mineral solids or air bubbles in the surrounding fluid media determine the bitumen liberation and flotation efficiency in oil sands production. The stability of complex oil/water emulsions is governed by the forces between emulsion drops and particularly between interface-active species (e.g., asphaltenes). Various oil components (e.g., asphaltenes) and emulsion drops interact with different substrate surfaces (e.g., pipelines or membranes), influencing fouling phenomena, oil–water separation, and wastewater treatment. Quantifying these intermolecular and interfacial forces has advanced the mechanistic understanding of these interfacial interactions, facilitating the development of advanced materials and technologies to solve relevant challenging issues and improve petroleum production processes. Remaining challenges and suggestions on future research directions in the field are also presented.
Keywords： Intermolecular and surface forces Interface Emulsion Colloids Fouling and antifouling Water treatment
Research and Development of CAD/CAPP/CAM Integrated System
Wei Erwei,Liang Muyang,Yang Ping
Strategic Study of CAE 2000, Volume 2, Issue 4, Pages 59-63
In this paper a practical CAD/CAPP/CAM integrated system is introduced. This system has been developed by mechanical designers, process planners and NC progragmmers on the basis of a commercial CAD/CAM software named Pro/ENGINEER. It consists of three subsystems： Feature Recognition Subsystem, CAPP Subsystem and Automatical CAM Subsystem. In Feature Recognition Subsystem, machining features information of a part is obtained from a three dimensional part. In CAPP Subsystem, machining features information is analyzed, sets and sequences of the process planning are created automatically, tool and cutting parameters for each sequence are selected from tools library, the order of sequences is arranged. In Automatical CAM Subsystem, NC sequences for machining the part are created automatically according to the CAPP result. After the NC sequences in the machining process being simulated, the file of cutter location data is generated. Finally through a post processor, the NC code file is output and transmitted to a NC machine to machine the part.
Keywords： CAD CAPP CAM feature recognition
A New Way to Evaluate Extensive Marketing Power
Xu Lijuan
Strategic Study of CAE 2006, Volume 8, Issue 6, Pages 100-102
The extensive marketing power is the ability of obtaining the consumers' approval during the course of market competition. This kind of approval may directly bring the sales volume, the profit, or just cause the consumer's interest to the enterprise or the product, the brand, but certainly will be able to build the good foundation for the enterprise's future. This paper puts forward a new method to evaluate this important power, so as to make a relatively scientific way to help raising enterprise's influencing power in market.
Keywords： marketing power extensive marketing power influencing power in market index of extensive marketing power
Title Author Date Type Operation
The Impact of Cropland Spatial Pattern Change on Grain Production in China
Li Yuanyuan, Tan Minghong, Zhang Hongqi
Journal Article
Rangeland Productivity in China
Hou Fujiang,Wang Chunmei,Lou Shanning,Hou Xiangyang and Hu Tianming
Journal Article
Theory and practice of turning R & D results into productive force in major equipment
Zhang Xiaolu
Journal Article
Water Resource Effectiveness of Vegetation Conservation and Restoration in North China
Sun Siqi,Chen Yongzhe,Wang Cong,Hu Qingfang,Lyu Yihe
Journal Article
Reconstructing Human‒Coal Space Relationship Through Coalmine Intellectualization
Fan Jingdao, Jin Zhixin, Wang Guofa, Li Chuan, Liu Wei, Yan Zhenguo
Journal Article
Current Situation and Future Security of Agricultural Water Resources in North China
Huang Feng, Du Taisheng, Wang Sufen, Mei Xurong, Gong Daozhi, Chen Yuanquan, Kang Shaozhong
Journal Article
The Skyscraper Crop Factory: A Potential Crop-Production System to Meet Rising Urban Food Demand
Li Zhang, Lan Huang, Tao Li, Tao Wang, Xiao Yang, Qichang Yang
Journal Article
Strategies for Soil Fertility Improvement of Arable Land in China
Yingjie Hu, Xiangbin Kong, Yuzhen Zhang
Journal Article
Coal to gas single cell protein-contribute to resolving the food crisis of China in future
Cao Chen,Yu Bo and Gu Weidong
Journal Article
Development Strategy for Standardization System of Producer Services
Jin Zongzhen,Zhuang Lijian,Xiang Ning
Journal Article
Research on the Strategy for Improving Cultivated Land Quality in China
Hongqi Zhang, Minghong Tan, Xiangbin Kong, Yongmei Xu, Erqi Xu, Erping Shang
Journal Article
Probing the Interfacial Forces and Surface Interaction Mechanisms in Petroleum Production Processes
Diling Yang,Xuwen Peng,Qiongyao Peng,Tao Wang,Chenyu Qiao,Ziqian Zhao,Lu Gong,Yueliang Liu,Hao Zhang,Hongbo Zeng,
Journal Article
Research and Development of CAD/CAPP/CAM Integrated System
Wei Erwei,Liang Muyang,Yang Ping
Journal Article
京公网安备 11010502051620号
