The provision mode of the telecommunication service has experienced an evolving process, and showing the developing trend from distributed to centralized, from integrated to separated, and from closed to open. To suit...The provision mode of the telecommunication service has experienced an evolving process, and showing the developing trend from distributed to centralized, from integrated to separated, and from closed to open. To suit this trend, there will be three provision modes as Session Initiation Protocol (SIP) server, Open Service Access (OSA) application server and intelligent network(IN) in Next Generation Network (NGN), provides all kinds of services and applications to the subscribers. With the popularity of broadband access and Internet, the NGN will provide single telecommunication service and act as the important national infrastructure to offer various information services to the subscribers. The service provision mode will be more open, diversified, and individualized.展开更多
How to conserve and develop the intangible cultural heritage is one of the hot topics in both tourism industry and academic research area. In the past, argument of conflict relationship between tourism and intangible ...How to conserve and develop the intangible cultural heritage is one of the hot topics in both tourism industry and academic research area. In the past, argument of conflict relationship between tourism and intangible cultural heritage has prevailed, however, more and more researches now question it. Based on the analysis of values and characteristics of intangible cultural heritage, this paper considers that the relationship can be beneficial to both with the appropriate and modest development, meanwhile, this paper summarizes seven tourism development modes, and at last it gives some advice on integrative adoption of those development modes after the thorough comparison of the seven modes.展开更多
Indigenous innovation focused on the development of technical standards has become the core of China's innovation policy,since China released the "Outline of the National Program for Longand Medium-Term Scien...Indigenous innovation focused on the development of technical standards has become the core of China's innovation policy,since China released the "Outline of the National Program for Longand Medium-Term Scientific and Technological Development (2006-2020)" in 2006.Meanwhile,standardization issues are greatly emphasized by high-tech zones which serve as the major carriers of national economic growth as well as innovation clusters in the context of fast-growing international standardization.By means of the effective guide of the government,the standardization of high-tech zones in China now presents a wide range of operating modes.Specifically,they can be divided predominantly into the government promotion mode,the alliance collaboration mode,the research-standard-industry linkage mode,and the talent training mode,in terms of the main body of work and influence factors.展开更多
Aesthetic education not only exists in the classroom,but also in the urban living environment.The development of this environmental aesthetic education function is often accompanied by the development and change of ur...Aesthetic education not only exists in the classroom,but also in the urban living environment.The development of this environmental aesthetic education function is often accompanied by the development and change of urban landscape.Urban agricultural landscape is an organic part of modern urban landscape.It is different from machines or buildings in general urban production and life.Its local aesthetic value should be fully recognized and excavated.This is mainly reflected in the beauty of traditional agricultural skills,agricultural landscapes,and agricultural activities.At the same time,according to the different ways of interaction between people and the environment(ways of receiving aesthetic education),the development mode of vernacular aesthetic education of urban agricultural landscape can be divided into three:viewing mode,short-time contact,and long-time immersion.展开更多
Under the background of urban renewal, this paper re-explores the tourism development modeof Nanluoguxiang historical and cultural block based on online review data, and puts forward correspondingdevelopment strategie...Under the background of urban renewal, this paper re-explores the tourism development modeof Nanluoguxiang historical and cultural block based on online review data, and puts forward correspondingdevelopment strategies. As a cultural label of a city, historical and cultural blocks should be updated first inorder to achieve sustainable development. By using multi-source big data review and qualitative researchmethods, the perception evaluation of tourists in Nanluoguxiang is obtained, and the shortcomings ofcurrent tourism development mode are analyzed. Furthermore, corresponding improvement strategies andsuggestions are put forward, in order to provide some effective ideas for the sustainable development ofhistorical and cultural blocks in the future.展开更多
Based on the requirements that Hainan has unique natural conditions and humanistic environment, using Google Sketchup as the development tool, a conceptual park of modern tropical recreational agriculture was prelimin...Based on the requirements that Hainan has unique natural conditions and humanistic environment, using Google Sketchup as the development tool, a conceptual park of modern tropical recreational agriculture was preliminarily designed. The development mode of featured and recreational agriculture in Hainan was discussed, in order to search for a better and more humanistic development mode of recreational agriculture in Hainan.展开更多
Tight sandstone gas serves as an important unconventional hydrocarbon resource, and outstanding results have been obtained through its discovery both in China and abroad given its great resource potential. However, he...Tight sandstone gas serves as an important unconventional hydrocarbon resource, and outstanding results have been obtained through its discovery both in China and abroad given its great resource potential. However, heated debates and gaps still remain regarding classification standards of tight sandstone gas, and critical controlling factors, accumulation mechanisms, and devel- opment modes of tight sandstone reservoirs are not deter- mined. Tight sandstone gas reservoirs in China are generally characterized by tight strata, widespread distri- bution areas, coal strata supplying gas, complex gas-water relations, and abnormally low gas reservoir pressure. Water and gas reversal patterns have been detected via glass tube and quartz sand modeling, and the presence of critical geological conditions without buoyancy-driven mecha- nisms can thus be assumed. According to the timing of gas charging and reservoir tightening phases, the following three tight sandstone gas reservoir types have been identified: (a) "accumulation-densification" (AD), or the conventional tight type, (b) "densification-accumulation" (DA), or the deep tight type, and (c) the composite tight type. For the AD type, gas charging occurs prior to reser- voir densification, accumulating in higher positions under buoyancy-controlled mechanisms with critical controlling factors such as source kitchens (S), regional overlaying cap rocks (C), gas reservoirs, (D) and low fluid potential areas (P). For the DA type, reservoir densification prior to the gas charging period (GCP) leads to accumulation in depres- sions and slopes largely due to hydrocarbon expansive forces without buoyancy, and critical controlling factors are effective source rocks (S), widely distributed reservoirs (D), stable tectonic settings (W) and universal densification of reservoirs (L). The composite type includes features of the AD type and DA type, and before and after reservoir densification period (RDP), gas charging and accumulation is controlled by early buoyancy and later molecular expansive force respectively. It is widely distributed in anticlinal zones, deep sag areas and slopes, and is con- trolled by source kitchens (S), reservoirs (D), cap rocks (C), stable tectonic settings (W), low fluid potential areas (P), and universal reservoir densification (L). Tight gas resources with great resource potential are widely dis- tributed worldwide, and tight gas in China that presents advantageous reservoir-forming conditions is primarily found in the Ordos, Sichuan, Tarim, Junggar, and Turpan- Hami basins of central-western China. Tight gas has served as the primary impetus for global unconventional natural gas exploration and production under existing technical conditions.展开更多
Based on the oil,gas and water distribution characteristics of Khasib reservoir in Halfaya oilfield,Iraq,a core displacement experiment is designed to evaluate the influence of different displacement methods and displ...Based on the oil,gas and water distribution characteristics of Khasib reservoir in Halfaya oilfield,Iraq,a core displacement experiment is designed to evaluate the influence of different displacement methods and displacement parameters on oil displacement efficiency.The research shows that,in the displacement method with water injected from the edge of the reservoir,early depletion production is conducive to the elastic expansion of the gas cap,forming the three-dimensional displacement of"upper pressure and lower pushing",and the oil displacement effect is good.When gas injection at the top and water injection at the edge are used for synergistic displacement,the injection timing has different influences on the oil displacement effects of high and low parts.Considering the overall oil displacement efficiency,the injection pressure should be greater than the bubble point pressure of crude oil.Two displacement methods are recommended with the reasonable injection time at 20–25 MPa.The injection speed has the same influence on different injection media.Appropriately reducing the injection speed is conducive to the stability of the displacement front,delaying the breakthrough of injection media and improving the oil displacement effect.The reasonable injection rate of water flooding is 0.075 mL/min,the reasonable injection rates of water and gas are 0.15 mL/min and 0.10 mL/min,respectively in gas-water synergistic displacement.Gas-water synergistic displacement is conducive to the production of crude oil at high position,and has crude oil recovery 5.0%–14.8%higher than water flooding from the edge,so it is recommended as the development mode of Khasib reservoir at the middle and late stages.展开更多
The development mode of mid-small cities in northern Jiangsu is analyzed on the Growth Pole theory.Depending on scales,endowment of resources,geographical positions,and industrial advantages of mil-small cities,we can...The development mode of mid-small cities in northern Jiangsu is analyzed on the Growth Pole theory.Depending on scales,endowment of resources,geographical positions,and industrial advantages of mil-small cities,we can divide the development mode of those mid-small cities within this context into five types:development through integration into big cities;independent development;resource-dependent development;single industry development;and mixed industry development.展开更多
The development mode of industrial civilization has created huge material wealth for human society,but at the same time the severe ecological problems that have arisen from it have made human civilization fall into th...The development mode of industrial civilization has created huge material wealth for human society,but at the same time the severe ecological problems that have arisen from it have made human civilization fall into the dispersion of unsustainable development.The industrialized development mode has obvious non-ecological economic qualities,which are specifically manifested in the destruction of the ecological economy relationship between nature and mankind,the emergence of cracks of metabolism between nature and mankind,the unbalanced development of the social productive forces and the natural productive forces,and the functioning of one-way linear non-circular economy.Under the trend of ecological evolution of human civilization,the industrial civilization will be replaced by the ecological civilization,and then the industrial economic development mode will be transformed into the ecological economic development mode.As a result,the predicament of once unsustainable development has been gradually dispersed and human civilization enters a beautiful new era of coordinated development of economic society and natural ecology.展开更多
If urban sprawl is to be avoided in China in the next ten years, it is not only crucial to understand the overall history, current status, and future trends of urban expansion there, but also these differences, and th...If urban sprawl is to be avoided in China in the next ten years, it is not only crucial to understand the overall history, current status, and future trends of urban expansion there, but also these differences, and this is presently lacking. In this study, remotely sensed images with approximately 30 m spatial resolution were used to quantitatively assess the spatial and temporal patterns of urban expansion of 60 Chinese cities(1973–2013). Urban-expansion-process curves of the cities studied were drawn using annual expansion area as an indicator. Curve similarity analysis generated four basic process modes of urban expansion in China. These included cities that: 1) peaked around 2004 and then decelerated; 2) peaked around 2010 and then decelerated; 3) showed sustained acceleration, and 4) showed continued deceleration. Four basic process modes represented cities under different levels of development stage. Geographic location was found to be the most related characteristic to urban expansion process. Regional development policies at the national level in each region also showed highly temporal consistency with fluctuation characteristics of urban expansion process. Urban characteristic such as population size and administrative level were not found to be significantly related to urban expansion-process modes. Understanding the basic process-mode categories well is extremely important for future regional-balance planning and development of macroeconomic policies.展开更多
China’s wind power has gone through an exploring course of 20 years. At present, it is on the fast track under the support of the state’s preferential policies concerned. The various wind power development areas in ...China’s wind power has gone through an exploring course of 20 years. At present, it is on the fast track under the support of the state’s preferential policies concerned. The various wind power development areas in China have made rapid progress and put forward their own thinking of developing wind energy.展开更多
The paper tries to explore circular economy from the viewpoint of the system theory. Circular economy is a kind of complicated economic activity, and it is a wholly new ecotype economy proposed by Western countries af...The paper tries to explore circular economy from the viewpoint of the system theory. Circular economy is a kind of complicated economic activity, and it is a wholly new ecotype economy proposed by Western countries after they had summed up many experiences and lessons from traditional economy. It is an entirety and has many layers. It keeps an open and dynamic balance. Because the system theory is the theoretical foundation of circular economy, we should systemically analyze and study circular economy from the macroscopic view, correctly grasp its operational laws, improve its service functions, and realize human beings' sustainable development. The paper introduces the content and general characteristics of the system theory and the idea of circular economy. Then it analyzes circular economy based on the system theory. The paper concludes that the integration of circular economy and the system theory can promote the functions of circular economy.展开更多
Based on the background and development of the pastoral complex,it is believed that the pastoral complex is an inevitable trend of the development of modern agriculture and it is the product of agriculture developing ...Based on the background and development of the pastoral complex,it is believed that the pastoral complex is an inevitable trend of the development of modern agriculture and it is the product of agriculture developing to a higher stage following agricultural industrial park,beautiful countryside,characteristic town,and whole area tourism. Combined with many years of planning and design practice of Wuhan Modern Urban Agriculture Planning and Design Institute,this paper summarized ideas of construction and operation of the pastoral complex,and discussed the construction of pastoral complex planning system,in the hope of providing certain reference for planning of pastoral complex in the whole country in the new period. Finally,through the overview of development history and highlight of urban agriculture in Wuhan,it came up with measures and recommendations for development of pastoral complex in Wuhan City.展开更多
From strengthening the construction of an innovation system,adhering to the green development model of the industry,advancing the rural revitalization strategy,strengthening the protection and inheritance of cultural ...From strengthening the construction of an innovation system,adhering to the green development model of the industry,advancing the rural revitalization strategy,strengthening the protection and inheritance of cultural heritage,accelerating the development of social undertakings,and expanding the space for regional cooperation,this paper discusses the strategies for the construction of sustainable development experimental zone in Fumian District,Yulin City.It is intended to build Fumian District into a vibrant,economically prosperous,urban and rural integrated,characteristic cultural,safe and harmonious,inclusive and open district.展开更多
The world today is facing a new round of scientific, technological and industrial revolution, and all countries are seeking new development models that have a major role in driving and leading the economy and society....The world today is facing a new round of scientific, technological and industrial revolution, and all countries are seeking new development models that have a major role in driving and leading the economy and society. China is also addressing the imbalance between economic development and ecological environmental protection through innovation development of green technology and continuously strives for high-quality economic development. Exploring the integrated development mode of green technology innovation has great theoretical significance and practical value for enhancing the competitiveness of enterprises, promoting the transformation and transfer of green technologies, spurring the development of green “One Belt and One Road”, and driving the economic development and reform in quality, efficiency, and forces. This article sorts out the core elements and influencing factors of constructing a green technology innovation and integration development model, expounds the innovation ecological framework that supports the development of green industries from the four dimensions of industrialization, marketization, informatization, and internationalization, and builds an intermediary that promotes integrated development. The functional architecture proposes an informatization infrastructure that promotes the industrial ecology, and designs a model for the integration and development of international green technology innovation, is of momentous theoretical significance and practical value to improve the quality of the global green development.展开更多
Daren Village in Ningbo has deeply explored the connotation of farming culture,and built an agricultural tourism health care industrial park integrating leisure agriculture,eco-tourism and healthy pastoral using the n...Daren Village in Ningbo has deeply explored the connotation of farming culture,and built an agricultural tourism health care industrial park integrating leisure agriculture,eco-tourism and healthy pastoral using the natural pastoral resources of the park.This pastoral complex achieves the goals of increasing agricultural efficiency and farmers'income and improving rural greening by strengthening industrial revitalization,integrating the"sixth industry"and building an urban-rural integrated development hub.However,in the process of development,there are also some problems,such as single development model,insufficient innovation,lack of brand effect,single financing mode and standardization of services.In view of these problems,this paper provides some scientific and objective guidance for the construction of domestic pastoral complex.展开更多
<span><span><b><span style="font-family:"">Purpose:</span></b></span></span><span><span><span><span style="font-family:"&qu...<span><span><b><span style="font-family:"">Purpose:</span></b></span></span><span><span><span><span style="font-family:""> Linac quality assurance (QA) can be time consuming involving set up, execution, analysis and subject to user variability. The purpose of this study i</span></span></span></span><span><span><span><span style="font-family:"">s to develop qualitative automation tools for mechanical and imaging QA to improve efficiency, consistency, and accuracy. <b>Methods and Materials: </b>Traditionally QA ha</span></span></span></span><span><span><span><span style="font-family:"">s</span></span></span></span><span><span><span><span style="font-family:""> been performed with graph paper, film, and multiple phantoms. Analysis consists of ruler and vendor provided software. We have developed a single four-phantom<b> </b>method for QA procedures including light-radiation coincidence, imaging quality, table motion and Isocentricity an</span></span></span></span><span><span><span><span style="font-family:"">d separately cone beam computed tomography. XML scripts were developed to execute a series of tasks using Varian’s Truebeam Developer Mode. Non-phantom QA procedures have also been developed including field size, dose rate, MLC position, MLC and gantry speed, star shot, Winston-Lutz and Half Beam Block. All analysis is performed using inhouse MATLAB codes. <b>Results: </b>Overall time savings were 2.2 hours per Linac per month. Consistency improvements (standard deviation, STD) were observed for some tests. For example: field size improved from 0.11</span></span></span></span><span><span><span><span style="font-family:""> </span></span></span></span><span><span><span><span style="font-family:"">mm to 0.04</span></span></span></span><span><span><span><span style="font-family:""> </span></span></span></span><span><span><span><span style="font-family:"">mm and table motion improved from 0.17</span></span></span></span><span><span><span><span style="font-family:""> </span></span></span></span><span><span><span><span style="font-family:"">mm to 0.12</span></span></span></span><span><span><span><span style="font-family:""> </span></span></span></span><span><span><span><span style="font-family:"">mm. CBCT STD improved from 0.99</span></span></span></span><span><span><span><span style="font-family:""> </span></span></span></span><span><span><span><span style="font-family:"">mm to 0.61</span></span></span></span><span><span><span><span style="font-family:""> </span></span></span></span><span><span><span><span style="font-family:"">mm for slice thickness. No STD change was observed for Isocentricity test. We noticed an increase in STD from 0.33</span></span></span></span><span><span><span><span style="font-family:""> </span></span></span></span><span><span><span><span style="font-family:"">mm to 0.41</span></span></span></span><span><span><span><span style="font-family:""> </span></span></span></span><span><span><span><span style="font-family:"">mm for light-radiation coincidence test. There was a small drop in field size accuracy. Isocentricity showed an increase in measurement accuracy from 0.47</span></span></span></span><span><span><span><span style="font-family:""> </span></span></span></span><span><span><span><span style="font-family:"">mm to 0.15</span></span></span></span><span><span><span><span style="font-family:""> </span></span></span></span><span><span><span><span style="font-family:"">mm. Table motion increased in accuracy from 0.20</span></span></span></span><span><span><span><span style="font-family:""> </span></span></span></span><span><span><span><span style="font-family:"">mm to 0.16</span></span></span></span><span><span><span><span style="font-family:""> </span></span></span></span><span><span><span><span style="font-family:"">mm. <b>Conclusion: </b>Automation is a viable, accurate and efficient option for monthly and annual QA.展开更多
The purpose of this paper is to study the issues on keeping the continuous development of Tibetan economy and the relative stability of its ecosystem. Hence, in order to achieve the object, the study analyzes the stat...The purpose of this paper is to study the issues on keeping the continuous development of Tibetan economy and the relative stability of its ecosystem. Hence, in order to achieve the object, the study analyzes the status quo of economic development in Tibet and the problems of resource exploitation. It especially discusses frailty of Tibetan eco-environment, and evaluates the contradictions between the traditional economic developing mode and the safety of plateau's ecosystem. It concludes that there is an inevitable clash between the development of Tibetan economy and the safety of plateau's eco-system; this problem cannot be avoided by any decision maker, Therefore, the character of Tibetan econvironment and the requirement of its economic development strategy determine that ecological economy developing mode is the only choice for Tibet. This paper suggests that it should be compensated by the national government to assure that Tibetan economy can keep a higher developing speed. In accordance with the feature of plateau eco-economy system and demand of Tibetan economic development, this paper also suggests several methods to apply the ecoeconomy developing strategy of Tibet.展开更多
Since the 18 th Party Congress, green and low carbon industry-oriented industrialization road became a new main industry development direction. Through analyzing four kinds of region industry development modes and cur...Since the 18 th Party Congress, green and low carbon industry-oriented industrialization road became a new main industry development direction. Through analyzing four kinds of region industry development modes and current situation of the industrial development of the western region, this paper uses DEA method to evaluate 11 western provinces industry green degree and resource utilization degree between 2008 and 2014, and gets the evolution process of the industrial development pattern during 7 years. The results indicate that: industrial development models are not the same in the western China and green degree are generally low. On this basis, it is concluded that the evolution of green development patterns for reference are 4 kinds of industrial development models. Finally, on the basis of green development pattern evolution path this paper provides advice to improve green degree and the degree of resource utilization.展开更多
文摘The provision mode of the telecommunication service has experienced an evolving process, and showing the developing trend from distributed to centralized, from integrated to separated, and from closed to open. To suit this trend, there will be three provision modes as Session Initiation Protocol (SIP) server, Open Service Access (OSA) application server and intelligent network(IN) in Next Generation Network (NGN), provides all kinds of services and applications to the subscribers. With the popularity of broadband access and Internet, the NGN will provide single telecommunication service and act as the important national infrastructure to offer various information services to the subscribers. The service provision mode will be more open, diversified, and individualized.
文摘How to conserve and develop the intangible cultural heritage is one of the hot topics in both tourism industry and academic research area. In the past, argument of conflict relationship between tourism and intangible cultural heritage has prevailed, however, more and more researches now question it. Based on the analysis of values and characteristics of intangible cultural heritage, this paper considers that the relationship can be beneficial to both with the appropriate and modest development, meanwhile, this paper summarizes seven tourism development modes, and at last it gives some advice on integrative adoption of those development modes after the thorough comparison of the seven modes.
文摘Indigenous innovation focused on the development of technical standards has become the core of China's innovation policy,since China released the "Outline of the National Program for Longand Medium-Term Scientific and Technological Development (2006-2020)" in 2006.Meanwhile,standardization issues are greatly emphasized by high-tech zones which serve as the major carriers of national economic growth as well as innovation clusters in the context of fast-growing international standardization.By means of the effective guide of the government,the standardization of high-tech zones in China now presents a wide range of operating modes.Specifically,they can be divided predominantly into the government promotion mode,the alliance collaboration mode,the research-standard-industry linkage mode,and the talent training mode,in terms of the main body of work and influence factors.
基金The 2021 Project of Aesthetics and Aesthetic Education Research Center of Sichuan Key Research Base of Social Sciences,“Study on the Development of Urban Agricultural Landscape Resources from the Perspective of Vernacular Aesthetic Education”(Project Number:21C032).
文摘Aesthetic education not only exists in the classroom,but also in the urban living environment.The development of this environmental aesthetic education function is often accompanied by the development and change of urban landscape.Urban agricultural landscape is an organic part of modern urban landscape.It is different from machines or buildings in general urban production and life.Its local aesthetic value should be fully recognized and excavated.This is mainly reflected in the beauty of traditional agricultural skills,agricultural landscapes,and agricultural activities.At the same time,according to the different ways of interaction between people and the environment(ways of receiving aesthetic education),the development mode of vernacular aesthetic education of urban agricultural landscape can be divided into three:viewing mode,short-time contact,and long-time immersion.
基金National Social Science Foundation Project of China(21FYSB048)Humanities and Social Sciences Research Project of the Ministry of Education(20YJAZH1010).
文摘Under the background of urban renewal, this paper re-explores the tourism development modeof Nanluoguxiang historical and cultural block based on online review data, and puts forward correspondingdevelopment strategies. As a cultural label of a city, historical and cultural blocks should be updated first inorder to achieve sustainable development. By using multi-source big data review and qualitative researchmethods, the perception evaluation of tourists in Nanluoguxiang is obtained, and the shortcomings ofcurrent tourism development mode are analyzed. Furthermore, corresponding improvement strategies andsuggestions are put forward, in order to provide some effective ideas for the sustainable development ofhistorical and cultural blocks in the future.
基金Supported by Sub-task of National Key Technology R & D Program (2009BADA1B03)~~
文摘Based on the requirements that Hainan has unique natural conditions and humanistic environment, using Google Sketchup as the development tool, a conceptual park of modern tropical recreational agriculture was preliminarily designed. The development mode of featured and recreational agriculture in Hainan was discussed, in order to search for a better and more humanistic development mode of recreational agriculture in Hainan.
基金supported by the National Natural Science Foundation of China (No. 41472112)the National Major Projects (No. 2011ZX05018002)
文摘Tight sandstone gas serves as an important unconventional hydrocarbon resource, and outstanding results have been obtained through its discovery both in China and abroad given its great resource potential. However, heated debates and gaps still remain regarding classification standards of tight sandstone gas, and critical controlling factors, accumulation mechanisms, and devel- opment modes of tight sandstone reservoirs are not deter- mined. Tight sandstone gas reservoirs in China are generally characterized by tight strata, widespread distri- bution areas, coal strata supplying gas, complex gas-water relations, and abnormally low gas reservoir pressure. Water and gas reversal patterns have been detected via glass tube and quartz sand modeling, and the presence of critical geological conditions without buoyancy-driven mecha- nisms can thus be assumed. According to the timing of gas charging and reservoir tightening phases, the following three tight sandstone gas reservoir types have been identified: (a) "accumulation-densification" (AD), or the conventional tight type, (b) "densification-accumulation" (DA), or the deep tight type, and (c) the composite tight type. For the AD type, gas charging occurs prior to reser- voir densification, accumulating in higher positions under buoyancy-controlled mechanisms with critical controlling factors such as source kitchens (S), regional overlaying cap rocks (C), gas reservoirs, (D) and low fluid potential areas (P). For the DA type, reservoir densification prior to the gas charging period (GCP) leads to accumulation in depres- sions and slopes largely due to hydrocarbon expansive forces without buoyancy, and critical controlling factors are effective source rocks (S), widely distributed reservoirs (D), stable tectonic settings (W) and universal densification of reservoirs (L). The composite type includes features of the AD type and DA type, and before and after reservoir densification period (RDP), gas charging and accumulation is controlled by early buoyancy and later molecular expansive force respectively. It is widely distributed in anticlinal zones, deep sag areas and slopes, and is con- trolled by source kitchens (S), reservoirs (D), cap rocks (C), stable tectonic settings (W), low fluid potential areas (P), and universal reservoir densification (L). Tight gas resources with great resource potential are widely dis- tributed worldwide, and tight gas in China that presents advantageous reservoir-forming conditions is primarily found in the Ordos, Sichuan, Tarim, Junggar, and Turpan- Hami basins of central-western China. Tight gas has served as the primary impetus for global unconventional natural gas exploration and production under existing technical conditions.
基金Supported by the Scientific Research and Technology Development Project of CNPC(2019D-4410)。
文摘Based on the oil,gas and water distribution characteristics of Khasib reservoir in Halfaya oilfield,Iraq,a core displacement experiment is designed to evaluate the influence of different displacement methods and displacement parameters on oil displacement efficiency.The research shows that,in the displacement method with water injected from the edge of the reservoir,early depletion production is conducive to the elastic expansion of the gas cap,forming the three-dimensional displacement of"upper pressure and lower pushing",and the oil displacement effect is good.When gas injection at the top and water injection at the edge are used for synergistic displacement,the injection timing has different influences on the oil displacement effects of high and low parts.Considering the overall oil displacement efficiency,the injection pressure should be greater than the bubble point pressure of crude oil.Two displacement methods are recommended with the reasonable injection time at 20–25 MPa.The injection speed has the same influence on different injection media.Appropriately reducing the injection speed is conducive to the stability of the displacement front,delaying the breakthrough of injection media and improving the oil displacement effect.The reasonable injection rate of water flooding is 0.075 mL/min,the reasonable injection rates of water and gas are 0.15 mL/min and 0.10 mL/min,respectively in gas-water synergistic displacement.Gas-water synergistic displacement is conducive to the production of crude oil at high position,and has crude oil recovery 5.0%–14.8%higher than water flooding from the edge,so it is recommended as the development mode of Khasib reservoir at the middle and late stages.
基金Philosophical and Social Science Research Project in Colleges and Universities of Jiangsu Province in 2010 (2010SJD790005)
文摘The development mode of mid-small cities in northern Jiangsu is analyzed on the Growth Pole theory.Depending on scales,endowment of resources,geographical positions,and industrial advantages of mil-small cities,we can divide the development mode of those mid-small cities within this context into five types:development through integration into big cities;independent development;resource-dependent development;single industry development;and mixed industry development.
基金Supported by the Key Research Projects of Shanxi Federation of Social Sciences from 2020 to 2021(SSKLZDKT2020001)Later Funded Project of Philosophy and Social Sciences in Shanxi Province in 2019(2019D008)+1 种基金Research Project Supported by Shanxi Scholarship Council of China(HGKY2019074)the Humanities and Social Sciences Research Foundation Project of North University of China in 2019(ZYMY201903).
文摘The development mode of industrial civilization has created huge material wealth for human society,but at the same time the severe ecological problems that have arisen from it have made human civilization fall into the dispersion of unsustainable development.The industrialized development mode has obvious non-ecological economic qualities,which are specifically manifested in the destruction of the ecological economy relationship between nature and mankind,the emergence of cracks of metabolism between nature and mankind,the unbalanced development of the social productive forces and the natural productive forces,and the functioning of one-way linear non-circular economy.Under the trend of ecological evolution of human civilization,the industrial civilization will be replaced by the ecological civilization,and then the industrial economic development mode will be transformed into the ecological economic development mode.As a result,the predicament of once unsustainable development has been gradually dispersed and human civilization enters a beautiful new era of coordinated development of economic society and natural ecology.
基金Under the auspices of National Natural Science Foundation of China(No.41201443,41101148)Strategic Planning Program in the Thirteenth Five-Year Plan of Institute of Remote Sensing and Digital Earth,Chinese Academy of Sciences(No.Y4SG0100CX)
文摘If urban sprawl is to be avoided in China in the next ten years, it is not only crucial to understand the overall history, current status, and future trends of urban expansion there, but also these differences, and this is presently lacking. In this study, remotely sensed images with approximately 30 m spatial resolution were used to quantitatively assess the spatial and temporal patterns of urban expansion of 60 Chinese cities(1973–2013). Urban-expansion-process curves of the cities studied were drawn using annual expansion area as an indicator. Curve similarity analysis generated four basic process modes of urban expansion in China. These included cities that: 1) peaked around 2004 and then decelerated; 2) peaked around 2010 and then decelerated; 3) showed sustained acceleration, and 4) showed continued deceleration. Four basic process modes represented cities under different levels of development stage. Geographic location was found to be the most related characteristic to urban expansion process. Regional development policies at the national level in each region also showed highly temporal consistency with fluctuation characteristics of urban expansion process. Urban characteristic such as population size and administrative level were not found to be significantly related to urban expansion-process modes. Understanding the basic process-mode categories well is extremely important for future regional-balance planning and development of macroeconomic policies.
文摘China’s wind power has gone through an exploring course of 20 years. At present, it is on the fast track under the support of the state’s preferential policies concerned. The various wind power development areas in China have made rapid progress and put forward their own thinking of developing wind energy.
基金supported by national soft science item of sciencetechnology department in China (Grant No: 2005DGQ4D130).
文摘The paper tries to explore circular economy from the viewpoint of the system theory. Circular economy is a kind of complicated economic activity, and it is a wholly new ecotype economy proposed by Western countries after they had summed up many experiences and lessons from traditional economy. It is an entirety and has many layers. It keeps an open and dynamic balance. Because the system theory is the theoretical foundation of circular economy, we should systemically analyze and study circular economy from the macroscopic view, correctly grasp its operational laws, improve its service functions, and realize human beings' sustainable development. The paper introduces the content and general characteristics of the system theory and the idea of circular economy. Then it analyzes circular economy based on the system theory. The paper concludes that the integration of circular economy and the system theory can promote the functions of circular economy.
文摘Based on the background and development of the pastoral complex,it is believed that the pastoral complex is an inevitable trend of the development of modern agriculture and it is the product of agriculture developing to a higher stage following agricultural industrial park,beautiful countryside,characteristic town,and whole area tourism. Combined with many years of planning and design practice of Wuhan Modern Urban Agriculture Planning and Design Institute,this paper summarized ideas of construction and operation of the pastoral complex,and discussed the construction of pastoral complex planning system,in the hope of providing certain reference for planning of pastoral complex in the whole country in the new period. Finally,through the overview of development history and highlight of urban agriculture in Wuhan,it came up with measures and recommendations for development of pastoral complex in Wuhan City.
基金Supported by Yulin Science and Technology Development Plan Project(YuShiKe 20204038,2019Cxpt00A4,YuShiKe 20202001).
文摘From strengthening the construction of an innovation system,adhering to the green development model of the industry,advancing the rural revitalization strategy,strengthening the protection and inheritance of cultural heritage,accelerating the development of social undertakings,and expanding the space for regional cooperation,this paper discusses the strategies for the construction of sustainable development experimental zone in Fumian District,Yulin City.It is intended to build Fumian District into a vibrant,economically prosperous,urban and rural integrated,characteristic cultural,safe and harmonious,inclusive and open district.
文摘The world today is facing a new round of scientific, technological and industrial revolution, and all countries are seeking new development models that have a major role in driving and leading the economy and society. China is also addressing the imbalance between economic development and ecological environmental protection through innovation development of green technology and continuously strives for high-quality economic development. Exploring the integrated development mode of green technology innovation has great theoretical significance and practical value for enhancing the competitiveness of enterprises, promoting the transformation and transfer of green technologies, spurring the development of green “One Belt and One Road”, and driving the economic development and reform in quality, efficiency, and forces. This article sorts out the core elements and influencing factors of constructing a green technology innovation and integration development model, expounds the innovation ecological framework that supports the development of green industries from the four dimensions of industrialization, marketization, informatization, and internationalization, and builds an intermediary that promotes integrated development. The functional architecture proposes an informatization infrastructure that promotes the industrial ecology, and designs a model for the integration and development of international green technology innovation, is of momentous theoretical significance and practical value to improve the quality of the global green development.
基金the Soft Science Fund Project of Ningbo Science and Technology Bureau,China(2021R009).
文摘Daren Village in Ningbo has deeply explored the connotation of farming culture,and built an agricultural tourism health care industrial park integrating leisure agriculture,eco-tourism and healthy pastoral using the natural pastoral resources of the park.This pastoral complex achieves the goals of increasing agricultural efficiency and farmers'income and improving rural greening by strengthening industrial revitalization,integrating the"sixth industry"and building an urban-rural integrated development hub.However,in the process of development,there are also some problems,such as single development model,insufficient innovation,lack of brand effect,single financing mode and standardization of services.In view of these problems,this paper provides some scientific and objective guidance for the construction of domestic pastoral complex.
文摘<span><span><b><span style="font-family:"">Purpose:</span></b></span></span><span><span><span><span style="font-family:""> Linac quality assurance (QA) can be time consuming involving set up, execution, analysis and subject to user variability. The purpose of this study i</span></span></span></span><span><span><span><span style="font-family:"">s to develop qualitative automation tools for mechanical and imaging QA to improve efficiency, consistency, and accuracy. <b>Methods and Materials: </b>Traditionally QA ha</span></span></span></span><span><span><span><span style="font-family:"">s</span></span></span></span><span><span><span><span style="font-family:""> been performed with graph paper, film, and multiple phantoms. Analysis consists of ruler and vendor provided software. We have developed a single four-phantom<b> </b>method for QA procedures including light-radiation coincidence, imaging quality, table motion and Isocentricity an</span></span></span></span><span><span><span><span style="font-family:"">d separately cone beam computed tomography. XML scripts were developed to execute a series of tasks using Varian’s Truebeam Developer Mode. Non-phantom QA procedures have also been developed including field size, dose rate, MLC position, MLC and gantry speed, star shot, Winston-Lutz and Half Beam Block. All analysis is performed using inhouse MATLAB codes. <b>Results: </b>Overall time savings were 2.2 hours per Linac per month. Consistency improvements (standard deviation, STD) were observed for some tests. For example: field size improved from 0.11</span></span></span></span><span><span><span><span style="font-family:""> </span></span></span></span><span><span><span><span style="font-family:"">mm to 0.04</span></span></span></span><span><span><span><span style="font-family:""> </span></span></span></span><span><span><span><span style="font-family:"">mm and table motion improved from 0.17</span></span></span></span><span><span><span><span style="font-family:""> </span></span></span></span><span><span><span><span style="font-family:"">mm to 0.12</span></span></span></span><span><span><span><span style="font-family:""> </span></span></span></span><span><span><span><span style="font-family:"">mm. CBCT STD improved from 0.99</span></span></span></span><span><span><span><span style="font-family:""> </span></span></span></span><span><span><span><span style="font-family:"">mm to 0.61</span></span></span></span><span><span><span><span style="font-family:""> </span></span></span></span><span><span><span><span style="font-family:"">mm for slice thickness. No STD change was observed for Isocentricity test. We noticed an increase in STD from 0.33</span></span></span></span><span><span><span><span style="font-family:""> </span></span></span></span><span><span><span><span style="font-family:"">mm to 0.41</span></span></span></span><span><span><span><span style="font-family:""> </span></span></span></span><span><span><span><span style="font-family:"">mm for light-radiation coincidence test. There was a small drop in field size accuracy. Isocentricity showed an increase in measurement accuracy from 0.47</span></span></span></span><span><span><span><span style="font-family:""> </span></span></span></span><span><span><span><span style="font-family:"">mm to 0.15</span></span></span></span><span><span><span><span style="font-family:""> </span></span></span></span><span><span><span><span style="font-family:"">mm. Table motion increased in accuracy from 0.20</span></span></span></span><span><span><span><span style="font-family:""> </span></span></span></span><span><span><span><span style="font-family:"">mm to 0.16</span></span></span></span><span><span><span><span style="font-family:""> </span></span></span></span><span><span><span><span style="font-family:"">mm. <b>Conclusion: </b>Automation is a viable, accurate and efficient option for monthly and annual QA.
文摘The purpose of this paper is to study the issues on keeping the continuous development of Tibetan economy and the relative stability of its ecosystem. Hence, in order to achieve the object, the study analyzes the status quo of economic development in Tibet and the problems of resource exploitation. It especially discusses frailty of Tibetan eco-environment, and evaluates the contradictions between the traditional economic developing mode and the safety of plateau's ecosystem. It concludes that there is an inevitable clash between the development of Tibetan economy and the safety of plateau's eco-system; this problem cannot be avoided by any decision maker, Therefore, the character of Tibetan econvironment and the requirement of its economic development strategy determine that ecological economy developing mode is the only choice for Tibet. This paper suggests that it should be compensated by the national government to assure that Tibetan economy can keep a higher developing speed. In accordance with the feature of plateau eco-economy system and demand of Tibetan economic development, this paper also suggests several methods to apply the ecoeconomy developing strategy of Tibet.
文摘Since the 18 th Party Congress, green and low carbon industry-oriented industrialization road became a new main industry development direction. Through analyzing four kinds of region industry development modes and current situation of the industrial development of the western region, this paper uses DEA method to evaluate 11 western provinces industry green degree and resource utilization degree between 2008 and 2014, and gets the evolution process of the industrial development pattern during 7 years. The results indicate that: industrial development models are not the same in the western China and green degree are generally low. On this basis, it is concluded that the evolution of green development patterns for reference are 4 kinds of industrial development models. Finally, on the basis of green development pattern evolution path this paper provides advice to improve green degree and the degree of resource utilization.