Professionalization of Chinese peasantry is now facing such problems as generally low quality of peasants as a result of talents outflow fragmentation of agricultural production and lack of normal and unified social s...Professionalization of Chinese peasantry is now facing such problems as generally low quality of peasants as a result of talents outflow fragmentation of agricultural production and lack of normal and unified social security system.A series of effective measures should be taken to ensure the achievement of professionalization of the peasantry and agricultural modernization.展开更多
Platinum catalyst gauzes have been in use since the moment of development of the process of catalyst oxidation of ammonia for production of nitric acid or hydrocyanic acid.Catalyst gauzes are usually made of platinum ...Platinum catalyst gauzes have been in use since the moment of development of the process of catalyst oxidation of ammonia for production of nitric acid or hydrocyanic acid.Catalyst gauzes are usually made of platinum or its alloys with rhodium and palladium.These precious metals have remarkable properties that make them ideal catalysts for acceleration of the ammonia/oxygen reaction.In 2008,OJSC "SIC 'Supermetal'" and Umicore AG&Co.KG launched a production line for Pt-alloy-based catalyst systems to be used for ammonia oxidation in the production of weak nitric acid.Catalyst systems consist of a pack of catalyst gauzes and a pack of catchment gauzes,which are made using flat-bed knitting machines and wire-cloth looms.Today,up-to-date catalyst systems MKSprecise TM are being manufactured,the basic advantages of which are an individual structure of gauzes and composition of the material,which allows to define precisely the position of each gauze in the catalyst pack,a high activity of the catalyst pack,direct catching of platinum and rhodium in the catalyst system,and a reasonable combination of single-and multilayer types of gauzes.This makes it possible to vary the configuration of the catalyst and select an optimum composition of the system to ensure the maximum efficiency of the ammonia oxidation process.We also produce the catchment systems that allow to find the best decision from the economic point view for each individual case.展开更多
自联合国粮农组织(FAO)启动“全球重要农业文化遗产(GIAHS)”保护项目以来,学术界对农业文化遗产研究的关注度不断提高。为系统考察和直观反映中国农业文化遗产研究的现状、热点和前沿,以“农业文化遗产”为主题,基于中国知网(CNKI)和We...自联合国粮农组织(FAO)启动“全球重要农业文化遗产(GIAHS)”保护项目以来,学术界对农业文化遗产研究的关注度不断提高。为系统考察和直观反映中国农业文化遗产研究的现状、热点和前沿,以“农业文化遗产”为主题,基于中国知网(CNKI)和Web of Science数据库,筛选出2006—2019年相关文献共240篇进行文献计量和知识图谱分析。结果表明:2006—2019年,中国农业文化遗产研究大体经历了初步探索、快速增长和平稳发展3个阶段。在刊文载体上,已形成由《中国农史》《中国农业大学学报》《资源科学》《中国生态农业学报》《Journal of Resources and Ecology》等8种期刊组成的核心期刊群;在研究机构上,以中国科学院地理科学与资源研究所、南京农业大学等为代表的科研院所占据重要地位;在发文作者上,以闵庆文、王思明及其团队为引领而取得的成果最为丰硕;在研究内容上,多侧重于农业文化遗产的保护利用、旅游开发、价值评价等方面;在研究案例选择上,主要集中于拥有全球及中国重要农业文化遗产的云南、浙江、江苏、贵州、广西等省;在研究方法上,仍以个案分析、定性分析居多。今后应继续深化农业文化遗产概念、分类、保护机制与模式等基础理论研究;拓展农业文化遗产时空动态演变、监测预警机制构建、经济—社会—文化—生态环境效应评估等新领域研究;主动对接国家重大战略需求,加强“一带一路”、大运河、黄河流域、长江经济带等重点区域农业文化遗产研究;不断拓宽研究视野,推进多学科理论、方法、技术集成和综合应用,打造农业文化遗产研究多元融合共同体。展开更多
This paper studies the industrialization of China, a key problem of Chinese economic development with self-organization theory in system science. The dual economic structure of modern industry and traditional agricult...This paper studies the industrialization of China, a key problem of Chinese economic development with self-organization theory in system science. The dual economic structure of modern industry and traditional agriculture existing simultaneously is the typical economic structure for most developing countries. How can we break the dual economic structure? After China has carried out the peasant family output-related system of contracted responsibilities, the rural enterprises which develop swiftly and violently are setting up a bridge between traditional agriculture and modern industry. This paper models the triple economic structure formed by traditional agriculture, rural enterprises and modern industry. From the study of structure evolution, we obtain the important relationship between economic growth rate, the rate of technological progress, the growth rate of capital and the growth rate of population, deduce three critical points of population growth, and find out the conditions under which the national economic system forms a stable and orderly self-organized structure. On the basis of quantitative analysis, we propose an approach to the strategies of industrialization of China, especially to the problem of rural enterprise development and rural labor transfer, and give three conclusions and four developmental strategies about national economic system.展开更多
The paper describes the development of mobile communication first and then points out that it is necessary for China to develop satellite mobile communication after comparing the cellular mobile communication with the...The paper describes the development of mobile communication first and then points out that it is necessary for China to develop satellite mobile communication after comparing the cellular mobile communication with the satellite mobile communication. After comparing the geostationary satellite system with the low earth orbit satellite mobile communication system, as well as the single-beam system with the multibeams system, both used in satellite mobile communication, we suggest that China, according to its economic status and level of satellite technology, should develop a geostationary multibeam satellite for its domestic mobile communication.展开更多
Islanding detection is a mandatory component in grid-connected photovoltaic （PV） inverters. It is also a key issue in the photovoltaic agriculture. In this work, an overview on the islanding effect in grid-connected...Islanding detection is a mandatory component in grid-connected photovoltaic （PV） inverters. It is also a key issue in the photovoltaic agriculture. In this work, an overview on the islanding effect in grid-connected PV power systems was provided. Various islanding detection methods were introduced and their strength and weakness were dicussed. An improved islanding detection method was proposed based on active frequency drift （AFD）. The new method tolerated capacitive and inductive loads, because its perturbation signal was not offset by the non-resistive load. The new method through simulation in MATLAB/Simulink was evaluated and the advantages of the new method were demonstrated.展开更多
In order to establish modern agriculture and reduce harmful effects of natural disasters to agriculture, developing agricultural insurance and improving agricultural management system are essential. This paper firstly...In order to establish modern agriculture and reduce harmful effects of natural disasters to agriculture, developing agricultural insurance and improving agricultural management system are essential. This paper firstly elaborated the feasibility and importance of improving agricultural economy, and analyzed some reasons which restricted China agricultural insurance developing speed, and then gave some improving suggestions in the end.展开更多
It is a social system engineering to solve problems of city agricultural laborers, inevitably concerning series of social phenomenon and the social issues of the city and countryside relations, the government function...It is a social system engineering to solve problems of city agricultural laborers, inevitably concerning series of social phenomenon and the social issues of the city and countryside relations, the government function, the city management, the fair efficiency, the population flows, the labor employment, the social security, and so on. Furthermore, it also involves the profoundly political and economic system reforms, the transformation of government functions, the system perfection, legal administration, the social stability in China. The city government, as the direct superintendent of the agricultural laborers, should adopt the conception of the system engineering to construct a new mechanism of the city agricultural laborers socialization standard management, which has a profound theoretical and practical significance.展开更多
基金the phased achievement of national natural science fund project"The Influence of Professionalization of the Peasantry on Implementation Path of Scale Operation of High-Value Agro-Products"(71403208)research project of humanities and social sciences of Northwest A & F University"Study on Scale Operation of High-Value Agro-Products from the Perspective of the Professionalization of the Peasantry"(2014RWYB04)
文摘Professionalization of Chinese peasantry is now facing such problems as generally low quality of peasants as a result of talents outflow fragmentation of agricultural production and lack of normal and unified social security system.A series of effective measures should be taken to ensure the achievement of professionalization of the peasantry and agricultural modernization.
文摘Platinum catalyst gauzes have been in use since the moment of development of the process of catalyst oxidation of ammonia for production of nitric acid or hydrocyanic acid.Catalyst gauzes are usually made of platinum or its alloys with rhodium and palladium.These precious metals have remarkable properties that make them ideal catalysts for acceleration of the ammonia/oxygen reaction.In 2008,OJSC "SIC 'Supermetal'" and Umicore AG&Co.KG launched a production line for Pt-alloy-based catalyst systems to be used for ammonia oxidation in the production of weak nitric acid.Catalyst systems consist of a pack of catalyst gauzes and a pack of catchment gauzes,which are made using flat-bed knitting machines and wire-cloth looms.Today,up-to-date catalyst systems MKSprecise TM are being manufactured,the basic advantages of which are an individual structure of gauzes and composition of the material,which allows to define precisely the position of each gauze in the catalyst pack,a high activity of the catalyst pack,direct catching of platinum and rhodium in the catalyst system,and a reasonable combination of single-and multilayer types of gauzes.This makes it possible to vary the configuration of the catalyst and select an optimum composition of the system to ensure the maximum efficiency of the ammonia oxidation process.We also produce the catchment systems that allow to find the best decision from the economic point view for each individual case.
文摘自联合国粮农组织(FAO)启动“全球重要农业文化遗产(GIAHS)”保护项目以来,学术界对农业文化遗产研究的关注度不断提高。为系统考察和直观反映中国农业文化遗产研究的现状、热点和前沿,以“农业文化遗产”为主题,基于中国知网(CNKI)和Web of Science数据库,筛选出2006—2019年相关文献共240篇进行文献计量和知识图谱分析。结果表明:2006—2019年,中国农业文化遗产研究大体经历了初步探索、快速增长和平稳发展3个阶段。在刊文载体上,已形成由《中国农史》《中国农业大学学报》《资源科学》《中国生态农业学报》《Journal of Resources and Ecology》等8种期刊组成的核心期刊群;在研究机构上,以中国科学院地理科学与资源研究所、南京农业大学等为代表的科研院所占据重要地位;在发文作者上,以闵庆文、王思明及其团队为引领而取得的成果最为丰硕;在研究内容上,多侧重于农业文化遗产的保护利用、旅游开发、价值评价等方面;在研究案例选择上,主要集中于拥有全球及中国重要农业文化遗产的云南、浙江、江苏、贵州、广西等省;在研究方法上,仍以个案分析、定性分析居多。今后应继续深化农业文化遗产概念、分类、保护机制与模式等基础理论研究;拓展农业文化遗产时空动态演变、监测预警机制构建、经济—社会—文化—生态环境效应评估等新领域研究;主动对接国家重大战略需求,加强“一带一路”、大运河、黄河流域、长江经济带等重点区域农业文化遗产研究;不断拓宽研究视野,推进多学科理论、方法、技术集成和综合应用,打造农业文化遗产研究多元融合共同体。
文摘This paper studies the industrialization of China, a key problem of Chinese economic development with self-organization theory in system science. The dual economic structure of modern industry and traditional agriculture existing simultaneously is the typical economic structure for most developing countries. How can we break the dual economic structure? After China has carried out the peasant family output-related system of contracted responsibilities, the rural enterprises which develop swiftly and violently are setting up a bridge between traditional agriculture and modern industry. This paper models the triple economic structure formed by traditional agriculture, rural enterprises and modern industry. From the study of structure evolution, we obtain the important relationship between economic growth rate, the rate of technological progress, the growth rate of capital and the growth rate of population, deduce three critical points of population growth, and find out the conditions under which the national economic system forms a stable and orderly self-organized structure. On the basis of quantitative analysis, we propose an approach to the strategies of industrialization of China, especially to the problem of rural enterprise development and rural labor transfer, and give three conclusions and four developmental strategies about national economic system.
文摘The paper describes the development of mobile communication first and then points out that it is necessary for China to develop satellite mobile communication after comparing the cellular mobile communication with the satellite mobile communication. After comparing the geostationary satellite system with the low earth orbit satellite mobile communication system, as well as the single-beam system with the multibeams system, both used in satellite mobile communication, we suggest that China, according to its economic status and level of satellite technology, should develop a geostationary multibeam satellite for its domestic mobile communication.
基金Supported by the National Science and Technology Support Program(2014BAD06B04-1-09)China Postdoctoral Fund(2016M601406)Heilongjiang Postdoctoral Fund(LBHZ15024)
文摘Islanding detection is a mandatory component in grid-connected photovoltaic （PV） inverters. It is also a key issue in the photovoltaic agriculture. In this work, an overview on the islanding effect in grid-connected PV power systems was provided. Various islanding detection methods were introduced and their strength and weakness were dicussed. An improved islanding detection method was proposed based on active frequency drift （AFD）. The new method tolerated capacitive and inductive loads, because its perturbation signal was not offset by the non-resistive load. The new method through simulation in MATLAB/Simulink was evaluated and the advantages of the new method were demonstrated.
文摘In order to establish modern agriculture and reduce harmful effects of natural disasters to agriculture, developing agricultural insurance and improving agricultural management system are essential. This paper firstly elaborated the feasibility and importance of improving agricultural economy, and analyzed some reasons which restricted China agricultural insurance developing speed, and then gave some improving suggestions in the end.
基金Supported by Social Sciences Fund of Heilongjiang Province (06B002)
文摘It is a social system engineering to solve problems of city agricultural laborers, inevitably concerning series of social phenomenon and the social issues of the city and countryside relations, the government function, the city management, the fair efficiency, the population flows, the labor employment, the social security, and so on. Furthermore, it also involves the profoundly political and economic system reforms, the transformation of government functions, the system perfection, legal administration, the social stability in China. The city government, as the direct superintendent of the agricultural laborers, should adopt the conception of the system engineering to construct a new mechanism of the city agricultural laborers socialization standard management, which has a profound theoretical and practical significance.
