Natural fractures are critical for shale oil and gas enrichment and development. Due to the extremely high heterogeneity of shale, the factors controlling the formation of internal fractures, especially horizontal fra...Natural fractures are critical for shale oil and gas enrichment and development. Due to the extremely high heterogeneity of shale, the factors controlling the formation of internal fractures, especially horizontal fractures, remain controversial. In this study, we integrate thin section analysis and microcomputed tomography(CT) data from several lacustrine shale samples from the third member(Es3) of the Shahejie Formation, Qikou Sag, Bohai Bay Basin, to assess the fractures in detail. The goal is to reveal the development characteristics, controlling factors, and geological significance for evaluating sweet spots in a shale oil play. The fractures in the Es3contain high-angle structural and horizontal bed-parallel fractures that are mostly shear and extensional. Various factors influence fracture development,including lithofacies, mineral composition, organic matter content, and the number of laminae. Structural fractures occur predominantly in siltstone, whereas bed-parallel fractures are abundant in laminated shale and layered mudstone. A higher quartz content results in higher shale brittleness, causing fractures, whereas the transformation between clay minerals contributes to the development of bedparallel fractures. Excess pore pressure due to hydrocarbon generation and expulsion during thermal advance can cause the formation of bed-parallel fractures. The density of the bed-parallel and structural fractures increases with the lamina density, and the bed-parallel fractures are more sensitive to the number of laminae. The fractures are critical storage spaces and flow conduits and are indicative of sweet spots. The laminated shale in the Es3with a high organic matter content contains natural fractures and is an organic-rich, liquid-rich, self-sourced shale play. Conversely, the siltstone, massive mudstone, and argillaceous carbonate lithofacies contain lower amounts of organic matter and do not have bed-parallel fractures. However, good reservoirs can form in these areas when structural fractures are present and the source, and storage spaces are separated.展开更多
The green development of socialism with Chinese characteristics is a scientific and rational choice based on the development theory of Marxism,reflecting on historical practice and practicing the value pursuit of Comm...The green development of socialism with Chinese characteristics is a scientific and rational choice based on the development theory of Marxism,reflecting on historical practice and practicing the value pursuit of Communists.Comprehensive understanding and mastering the internal logic and value pursuit of the green development of socialism with Chinese characteristics for a new era is in favor of upholding and improving the system of socialism with Chinese characteristics in the new situation,implementing the strictest ecological and environmental protection system,and unswervingly taking the path of innovation,coordination,green development,openness and sharing,and providing ideological powers and operational guidance for the construction of a Beautiful China and the modernization of harmonious coexistence between mankind and nature.展开更多
As China entered into a new era of development, the primary contradiction facing Chinese society has also evolved. It is important for both scholars and policymakers to review the characteristics of China's econom...As China entered into a new era of development, the primary contradiction facing Chinese society has also evolved. It is important for both scholars and policymakers to review the characteristics of China's economy in its present stage in accordance with economic principles-principles that reflect every aspect of economic and social life and macroeconomic regulation. In this paper, we attempt to unravel the characteristics of China's new era from three perspectives-historical materialism, dialectic materialism and epistemology, and in light of economic principles at the three levels of resource factors, modes of production and regulation of resource allocation. Based on these perspectives, this paper further identifies the characteristics of China's new era from nine aspects, including globalization, modernization, the primary stage of socialism, new development concepts, supply-side reforms, the guideline of seeking steady progress, the mentality of scope, bottomline mindset and strategic composure. From the three different levels, this paper summarizes and applies economic principles to propose solutions to the problems and challenges facing China in the new era. The findings of the paper are also relevant to implementation of the guidelines CPC Central Committee General Secretary Xi Jinping noted in his report to the 19 th CPC National Congress.展开更多
Like most countries in the world, China supports the ideal of human rights de- picted and advocated in the Universal Declaration of Human Rights and other international docu- ments and agrees with the idea that human ...Like most countries in the world, China supports the ideal of human rights de- picted and advocated in the Universal Declaration of Human Rights and other international docu- ments and agrees with the idea that human rights should be universal. However, China also holds that to better realize the common goals of human rights requires that each coun- try explore and find the best and most efficient way in accordance with its own conditions. One of the reasons for the fast development of human rights in China since its reform and opening-up is that China has chosen a development path for human rights according to its own conditions. The path fits the conditions of China and therefore efficiently promotes the realization of universal human rights.展开更多
Recycling of junks is positive for the environmental protection.Along with the proposal of three-child policy,purchase volume of milk powder surely will experience a drastic growth,and the milk powder spoon as an affi...Recycling of junks is positive for the environmental protection.Along with the proposal of three-child policy,purchase volume of milk powder surely will experience a drastic growth,and the milk powder spoon as an affiliated product will win the attention of parents.Against the background of consumption upgrading,consumers have had higher requirements on the humanization and safety design of products.Most of milk powder spoons on the market are plastic,and the disposal of waste milk powder spoon has gradually become a burden for the environment.Based on the environment-friendly and developmental concept,and also the characteristics of infant development,this paper proposed the“in-one”design,applied color and tactile designs into the milk powder design,chose food grade silicone to make the milk powder spoon not only a spoon but also a baby teether toy,so as to expand the service life and functions of the product,meet the requirements of saving energy,protecting environment and developing circular economy,which also to some extent reduces the burden on environment brought by plastics,improves the efficiency of junk recycling,and meet the individualized needs of consumers.展开更多
The current world trend of electric power industry reform is to establish electric power market and introduce competition mechanism. China is no exception. This paper reviewed the recent industry reform of China’s el...The current world trend of electric power industry reform is to establish electric power market and introduce competition mechanism. China is no exception. This paper reviewed the recent industry reform of China’s electric power sector and elaborated the necessity of establishing electric power markets first. Then it discussed the electric power market models in China. Certain important problems and observations relevant to the electric power market design were further pointed out, based on the practice experiences in Sichuan Province.展开更多
Driving the development of human rights in China and participating in global human rights governance are the inherent requirements for the development of human rights with Chinese characteristics.To explore a path for...Driving the development of human rights in China and participating in global human rights governance are the inherent requirements for the development of human rights with Chinese characteristics.To explore a path for the development human rights with Chinese characteristics,the fundamental requirement is to push forward the development of the Party’s leadership in multiple dimensions while adhering to the Party’s leadership.Among them,the Party’s political leadership is the fundamental guarantee for the path of human rights development with Chinese characteristics to move in the right direction.The Party’s ideological leadership provides advanced guidance for the path of human rights development with Chinese characteristics.The Party’s strategic decision-making capability determines the effectiveness of the path of human rights development with Chinese characteristics.The Party’s capability of mobilizing and leading the whole of society and integrating political and social resources is a necessity for a sustainable power supply for the path of human rights development with Chinese characteristics.Establishing a path of human rights development with Chinese characteristics and further promoting respect for and protection of human rights are important actions to advance the Party’s leadership development in the New Era.展开更多
China Volunteer Service Federation is a nationalfederated social organization composed ofvoluntary service organizations and volunteers.Since its founding in more than two years ago,by strengthening cooperation with d...China Volunteer Service Federation is a nationalfederated social organization composed ofvoluntary service organizations and volunteers.Since its founding in more than two years ago,by strengthening cooperation with diversifiedvoluntary service organizations at all levels,promoting the working methods innovationof voluntary service in all sectors and regions,展开更多
This paper analyzes the differences in geological and development characteristics between continental shale oil in China and marine shale oil in North America, reviews the evaluation methods and technological progress...This paper analyzes the differences in geological and development characteristics between continental shale oil in China and marine shale oil in North America, reviews the evaluation methods and technological progress of the continental shale oil development in China, and points out the existing problems and development directions of the continental shale oil development. The research progress of development evaluation technologies such as favorable lithofacies identification, reservoir characterization, mobility evaluation, fracability evaluation, productivity evaluation and geological-mathematical modeling integration are introduced. The efficient exploration and development of continental shale oil in China are faced with many problems, such as weak basic theoretical research, imperfect exploration and development technology system, big gap in engineering technology between China and other countries, and high development cost. Three key research issues must be studied in the future:(1) forming differentiated development technologies of continental shale oil through geological and engineering integrated research;(2) strengthening the application of big data and artificial intelligence to improve the accuracy of development evaluation;(3) tackling enhanced shale oil recovery technology and research effective development method, so as to improve the development effect and benefit.展开更多
Based on the theory of structural analysis,the characteristics and structural patterns of subtle faults are studied using 3D seismic data of the Bohai Sea to analyze the development process and origin of the subtle fa...Based on the theory of structural analysis,the characteristics and structural patterns of subtle faults are studied using 3D seismic data of the Bohai Sea to analyze the development process and origin of the subtle faults.A method of identifying subtle faults is proposed,forming a complete system for analyzing origins of subtle faults in the Bohai Sea.The complex strike-slip fault patterns under the strike-slip and extension stress background,diverse formation rocks,and strong neotectonic movement are the reasons for the development of subtle faults.According to the tectonic origin and development location,the subtle faults in Bohai Sea can be divided into 12 types in the three categories of strike slip dominant,extension dominant and strike slip and extension composite,and the different types of subtle faults occur in different regions of the Bohai Sea.Unreasonable variation of sedimentary stratum thickness,inherited distortion or even abrupt change of stratum occurrence,zonation of plane fault combination and the variation of oil-water system in the same structure with no-lithologic change are the important signs for identifying subtle faults in Bohai Sea.The subtle faults greatly enlarge the size of the structural trap groups,and areas with dense subtle faults are often active area of hydrocarbon migration and accumulation and favorable exploration zones,which have strong control on the hydrocarbon accumulation.The identification method for subtle faults has guided the exploration in the mature areas of Bohai Sea effectively,with a number of large and medium oil and gas fields discovered,such as Bozhong 29-6 and Penglai 20-2.展开更多
The cultural ecology of university classroom has been influenced by postmodernism and has shown complex and variable characteristics.Specifically speaking,it tends to be both conflicting and interactive in terms of su...The cultural ecology of university classroom has been influenced by postmodernism and has shown complex and variable characteristics.Specifically speaking,it tends to be both conflicting and interactive in terms of subject relations in the classroom,fragmented and diversified in terms of classroom teaching,and redundant and dynamic in terms of classroom assessment.In order to further harmonize and develop the cultural ecology of university classrooms,it is necessary to expand the space for communication and interaction between teachers and students,improve the overall professional quality of faculty members,and perfect the management and assessment system for university teachers and students.展开更多
This study employs similar simulation testing and discrete element simulation coupling to analyze the failure and deformation processes of a model coal seam's roof.The caving area of the overburden rock is divided...This study employs similar simulation testing and discrete element simulation coupling to analyze the failure and deformation processes of a model coal seam's roof.The caving area of the overburden rock is divided into three zones:the delamination fracture zone,broken fracture zone,and compaction zone.The caving and fracture zones'heights are approximately 110 m above the coal seam,with a maximum subsidence of 11 m.The delamination fracture zone's porosity range is between 0.2 and 0.3,while the remainder of the roof predominantly exhibits a porosity of less than 0.1.In addition,the numerical model's stress analysis revealed that the overburden rock's displacement zone forms an'arch-beam'structure starting from 160 m,with the maximum and minimum stress values decreasing as the distance of advancement increases.In the stress beam interval of the overburden rock,the maximum value changes periodically as the advancement distance increases.Based on a comparative analysis between observable data from on-site work and numerical simulation results,the stress data from the numerical simulation are essentially consistent with the actual results detected on-site,indicating the validity of the numerical simulation results.展开更多
The seventh Chinese international machine tool exhibition is hold in Peking. This exhibition has such characteristic that the machine tools are mainly numerical controlled ones, and that it is the general trend, that ...The seventh Chinese international machine tool exhibition is hold in Peking. This exhibition has such characteristic that the machine tools are mainly numerical controlled ones, and that it is the general trend, that the machine tools have some functions of the personal computers, and that the exhibition of the five axle joint movement machine tools show that we have made a great break-through on the field, and that the nanometer machine tools draw so much attention on it and that the cutting speed are becoming higher and higher. The developing direction of our machine tool industry depends on strengthening to adjust the calling and that the enterprise must complete the reformation to itself and carrying forward enterprise informationizing and strenthening scientific research.展开更多
With the e-commerce economy spreading to rural areas,Taobao villages in Jiangsu Province present a rapid development trend.This paper firstly summarizes the general development situation of Taobao villages in Jiangsu ...With the e-commerce economy spreading to rural areas,Taobao villages in Jiangsu Province present a rapid development trend.This paper firstly summarizes the general development situation of Taobao villages in Jiangsu Province from the three aspects of quantity,product types,and spatial distribution.Then it analyzes the specific development characteristics of different product-based Taobao villages.Finally,from the four angles of industry bases,ecommerce platforms,e-commerce businessmen groups,and logistics support,it explores the driving mechanism of Taobao villages in Jiangsu Province and points out that more and more villages will be involved in the Internet revolution along with the further development of Internet and e-commerce.展开更多
The phenological phase, plant height, filler number, nutritional composition, yield and stem/leaf ratio of three oat (Arena sativa) varieties (lines) in winter dry land of Hunan were studied. The result shows that...The phenological phase, plant height, filler number, nutritional composition, yield and stem/leaf ratio of three oat (Arena sativa) varieties (lines) in winter dry land of Hunan were studied. The result shows that the three oat varieties were greatly different in plant height, nutritional composition, yield and stem/leaf ratio. Baiyan 7 had the best performance, with the plant height, tiller number and fresh yield of 101.67cm, 7.6 tiller/plant and 70.15 t/hm2 respectively ; the crude protein content of dry matter of Baiyan 7 was 32.63% ; the leaf weight per tiller of Baiyan 7 accounted for 31.6% of single tiller weight, while those of Baiyan 8 and Baiyan 2 accounted for 31.3% and 29.2%, respectively. The single tiller weight of oat could be estimated/calculated by the model/formula Y = 0.043 7X - 2.89 ( R2 = 0.913 4, P 〈 0.01 ), where Y is the single tiller weight ( g ) and X is the plant height (cm). Comprehensive analysis showed that Baiyan 7 had higher yields and stem/leaf ratio. Thus, Baiyan 7 is more suitable for planting as a winter-spring forage in the winter dry land of Hunan.展开更多
In China, the Beautiful Countryside Development is a prototype of New Countryside Construction whose development mechanism is closely related to the urbanization level of the region. Regarding the consumption space pr...In China, the Beautiful Countryside Development is a prototype of New Countryside Construction whose development mechanism is closely related to the urbanization level of the region. Regarding the consumption space production of the metropolis amid the accelerating process of urbanization since the 1990 s, the declination of traditional villages is just inevitable. Thus, under the circumstances of new urbanization, the development of traditional villages is more and more related to the expansion of urban consumption space and the modernization of agriculture, as proved by the formation of a concentric-radial pattern of rings of consumption spaces in the rural area surrounding Hangzhou. Taking three villages around Hangzhou as a typical example of the Beautiful Countryside Development, this paper puts forward a Beauty Index System to evaluate their development characteristics and analyzes their development mechanisms respectively. It proves that the three villages are all characterized by the integrity of both production space and consumption space, yet with different attributes in terms of human settlement, society and culture, and industrial structure. It concludes that this is the result of various driving forces which also result in the formation of a concentric-radial pattern of rings in rural areas amid urbanization.展开更多
This paper makes a comprehensive analysis of the building of public library service brands in China since the initiation of the reform and opening up in 1978 and anticipate their future development in five aspects,i.e...This paper makes a comprehensive analysis of the building of public library service brands in China since the initiation of the reform and opening up in 1978 and anticipate their future development in five aspects,i.e.,critical interpretation of its established culture and analysis of its characteristics,logic of the time,vivid practice,virtuous approaches,as well as future development.展开更多
Chinese language teachers grow with certain characteristics in their professional development.Knowing these characteristics can reveal a teacher’s developmental needs which can inform the teachers and the teacher dev...Chinese language teachers grow with certain characteristics in their professional development.Knowing these characteristics can reveal a teacher’s developmental needs which can inform the teachers and the teacher development facilitators.This case study examines the professional development of one Chinese language teacher that works in a high school in the United States.The Five-Stage Theory is employed to direct the examination of the teacher’s growing path.Findings cover the challenges,efforts to cope with the changes,successes,and failures.展开更多
Urban forestry, which rose in the west in the latter half of the 20th century, is a type of forestry serving for city. Its important characteristic is that it makes through its narrow sense, or "urban afforestati...Urban forestry, which rose in the west in the latter half of the 20th century, is a type of forestry serving for city. Its important characteristic is that it makes through its narrow sense, or "urban afforestation", whose objective is to make city green and beautiful, and develops into a forestry system serving for the urban system. The consequence of rapid modern civilization is that skyscrapers concentrate in urban district and green space become narrower, resulting that展开更多
基金financially supported by the CNPC Prospective Basic Science and Technology Special Project(2023ZZ08)the Science and Technology Cooperation Project of the CNPC-SWPU Innovation Alliance(2020CX050103)。
文摘Natural fractures are critical for shale oil and gas enrichment and development. Due to the extremely high heterogeneity of shale, the factors controlling the formation of internal fractures, especially horizontal fractures, remain controversial. In this study, we integrate thin section analysis and microcomputed tomography(CT) data from several lacustrine shale samples from the third member(Es3) of the Shahejie Formation, Qikou Sag, Bohai Bay Basin, to assess the fractures in detail. The goal is to reveal the development characteristics, controlling factors, and geological significance for evaluating sweet spots in a shale oil play. The fractures in the Es3contain high-angle structural and horizontal bed-parallel fractures that are mostly shear and extensional. Various factors influence fracture development,including lithofacies, mineral composition, organic matter content, and the number of laminae. Structural fractures occur predominantly in siltstone, whereas bed-parallel fractures are abundant in laminated shale and layered mudstone. A higher quartz content results in higher shale brittleness, causing fractures, whereas the transformation between clay minerals contributes to the development of bedparallel fractures. Excess pore pressure due to hydrocarbon generation and expulsion during thermal advance can cause the formation of bed-parallel fractures. The density of the bed-parallel and structural fractures increases with the lamina density, and the bed-parallel fractures are more sensitive to the number of laminae. The fractures are critical storage spaces and flow conduits and are indicative of sweet spots. The laminated shale in the Es3with a high organic matter content contains natural fractures and is an organic-rich, liquid-rich, self-sourced shale play. Conversely, the siltstone, massive mudstone, and argillaceous carbonate lithofacies contain lower amounts of organic matter and do not have bed-parallel fractures. However, good reservoirs can form in these areas when structural fractures are present and the source, and storage spaces are separated.
文摘The green development of socialism with Chinese characteristics is a scientific and rational choice based on the development theory of Marxism,reflecting on historical practice and practicing the value pursuit of Communists.Comprehensive understanding and mastering the internal logic and value pursuit of the green development of socialism with Chinese characteristics for a new era is in favor of upholding and improving the system of socialism with Chinese characteristics in the new situation,implementing the strictest ecological and environmental protection system,and unswervingly taking the path of innovation,coordination,green development,openness and sharing,and providing ideological powers and operational guidance for the construction of a Beautiful China and the modernization of harmonious coexistence between mankind and nature.
文摘As China entered into a new era of development, the primary contradiction facing Chinese society has also evolved. It is important for both scholars and policymakers to review the characteristics of China's economy in its present stage in accordance with economic principles-principles that reflect every aspect of economic and social life and macroeconomic regulation. In this paper, we attempt to unravel the characteristics of China's new era from three perspectives-historical materialism, dialectic materialism and epistemology, and in light of economic principles at the three levels of resource factors, modes of production and regulation of resource allocation. Based on these perspectives, this paper further identifies the characteristics of China's new era from nine aspects, including globalization, modernization, the primary stage of socialism, new development concepts, supply-side reforms, the guideline of seeking steady progress, the mentality of scope, bottomline mindset and strategic composure. From the three different levels, this paper summarizes and applies economic principles to propose solutions to the problems and challenges facing China in the new era. The findings of the paper are also relevant to implementation of the guidelines CPC Central Committee General Secretary Xi Jinping noted in his report to the 19 th CPC National Congress.
文摘Like most countries in the world, China supports the ideal of human rights de- picted and advocated in the Universal Declaration of Human Rights and other international docu- ments and agrees with the idea that human rights should be universal. However, China also holds that to better realize the common goals of human rights requires that each coun- try explore and find the best and most efficient way in accordance with its own conditions. One of the reasons for the fast development of human rights in China since its reform and opening-up is that China has chosen a development path for human rights according to its own conditions. The path fits the conditions of China and therefore efficiently promotes the realization of universal human rights.
基金Sponsored by 2022 Teaching Reform Project of Lingnan Normal University(000302201830)2022 Model Course of Lingnan Normal University(LingShiJiaoWu(2014)No.125)2023 Undergraduate Students’Innovation and entrepreneurship Planning of Lingnan Normal University(X202310579049X).
文摘Recycling of junks is positive for the environmental protection.Along with the proposal of three-child policy,purchase volume of milk powder surely will experience a drastic growth,and the milk powder spoon as an affiliated product will win the attention of parents.Against the background of consumption upgrading,consumers have had higher requirements on the humanization and safety design of products.Most of milk powder spoons on the market are plastic,and the disposal of waste milk powder spoon has gradually become a burden for the environment.Based on the environment-friendly and developmental concept,and also the characteristics of infant development,this paper proposed the“in-one”design,applied color and tactile designs into the milk powder design,chose food grade silicone to make the milk powder spoon not only a spoon but also a baby teether toy,so as to expand the service life and functions of the product,meet the requirements of saving energy,protecting environment and developing circular economy,which also to some extent reduces the burden on environment brought by plastics,improves the efficiency of junk recycling,and meet the individualized needs of consumers.
文摘The current world trend of electric power industry reform is to establish electric power market and introduce competition mechanism. China is no exception. This paper reviewed the recent industry reform of China’s electric power sector and elaborated the necessity of establishing electric power markets first. Then it discussed the electric power market models in China. Certain important problems and observations relevant to the electric power market design were further pointed out, based on the practice experiences in Sichuan Province.
文摘Driving the development of human rights in China and participating in global human rights governance are the inherent requirements for the development of human rights with Chinese characteristics.To explore a path for the development human rights with Chinese characteristics,the fundamental requirement is to push forward the development of the Party’s leadership in multiple dimensions while adhering to the Party’s leadership.Among them,the Party’s political leadership is the fundamental guarantee for the path of human rights development with Chinese characteristics to move in the right direction.The Party’s ideological leadership provides advanced guidance for the path of human rights development with Chinese characteristics.The Party’s strategic decision-making capability determines the effectiveness of the path of human rights development with Chinese characteristics.The Party’s capability of mobilizing and leading the whole of society and integrating political and social resources is a necessity for a sustainable power supply for the path of human rights development with Chinese characteristics.Establishing a path of human rights development with Chinese characteristics and further promoting respect for and protection of human rights are important actions to advance the Party’s leadership development in the New Era.
文摘China Volunteer Service Federation is a nationalfederated social organization composed ofvoluntary service organizations and volunteers.Since its founding in more than two years ago,by strengthening cooperation with diversifiedvoluntary service organizations at all levels,promoting the working methods innovationof voluntary service in all sectors and regions,
基金National Science and Technology Major Project(2017ZX05049)。
文摘This paper analyzes the differences in geological and development characteristics between continental shale oil in China and marine shale oil in North America, reviews the evaluation methods and technological progress of the continental shale oil development in China, and points out the existing problems and development directions of the continental shale oil development. The research progress of development evaluation technologies such as favorable lithofacies identification, reservoir characterization, mobility evaluation, fracability evaluation, productivity evaluation and geological-mathematical modeling integration are introduced. The efficient exploration and development of continental shale oil in China are faced with many problems, such as weak basic theoretical research, imperfect exploration and development technology system, big gap in engineering technology between China and other countries, and high development cost. Three key research issues must be studied in the future:(1) forming differentiated development technologies of continental shale oil through geological and engineering integrated research;(2) strengthening the application of big data and artificial intelligence to improve the accuracy of development evaluation;(3) tackling enhanced shale oil recovery technology and research effective development method, so as to improve the development effect and benefit.
基金Supported by the China National Science and Technology Major Project(2016ZX05024-003)CNOOC Science and Technology Major Project(CNOOC-KJ135ZDXM36TJ08TJ)。
文摘Based on the theory of structural analysis,the characteristics and structural patterns of subtle faults are studied using 3D seismic data of the Bohai Sea to analyze the development process and origin of the subtle faults.A method of identifying subtle faults is proposed,forming a complete system for analyzing origins of subtle faults in the Bohai Sea.The complex strike-slip fault patterns under the strike-slip and extension stress background,diverse formation rocks,and strong neotectonic movement are the reasons for the development of subtle faults.According to the tectonic origin and development location,the subtle faults in Bohai Sea can be divided into 12 types in the three categories of strike slip dominant,extension dominant and strike slip and extension composite,and the different types of subtle faults occur in different regions of the Bohai Sea.Unreasonable variation of sedimentary stratum thickness,inherited distortion or even abrupt change of stratum occurrence,zonation of plane fault combination and the variation of oil-water system in the same structure with no-lithologic change are the important signs for identifying subtle faults in Bohai Sea.The subtle faults greatly enlarge the size of the structural trap groups,and areas with dense subtle faults are often active area of hydrocarbon migration and accumulation and favorable exploration zones,which have strong control on the hydrocarbon accumulation.The identification method for subtle faults has guided the exploration in the mature areas of Bohai Sea effectively,with a number of large and medium oil and gas fields discovered,such as Bozhong 29-6 and Penglai 20-2.
文摘The cultural ecology of university classroom has been influenced by postmodernism and has shown complex and variable characteristics.Specifically speaking,it tends to be both conflicting and interactive in terms of subject relations in the classroom,fragmented and diversified in terms of classroom teaching,and redundant and dynamic in terms of classroom assessment.In order to further harmonize and develop the cultural ecology of university classrooms,it is necessary to expand the space for communication and interaction between teachers and students,improve the overall professional quality of faculty members,and perfect the management and assessment system for university teachers and students.
基金National Key R&D Program of China(2023YFC3009100,2023YFC3009102)National Natural Science Foundation of China(52304198)Open Fund of the National and Local Joint Engineering Research Center for Safe and Accurate Coal Mining(EC2021016).
文摘This study employs similar simulation testing and discrete element simulation coupling to analyze the failure and deformation processes of a model coal seam's roof.The caving area of the overburden rock is divided into three zones:the delamination fracture zone,broken fracture zone,and compaction zone.The caving and fracture zones'heights are approximately 110 m above the coal seam,with a maximum subsidence of 11 m.The delamination fracture zone's porosity range is between 0.2 and 0.3,while the remainder of the roof predominantly exhibits a porosity of less than 0.1.In addition,the numerical model's stress analysis revealed that the overburden rock's displacement zone forms an'arch-beam'structure starting from 160 m,with the maximum and minimum stress values decreasing as the distance of advancement increases.In the stress beam interval of the overburden rock,the maximum value changes periodically as the advancement distance increases.Based on a comparative analysis between observable data from on-site work and numerical simulation results,the stress data from the numerical simulation are essentially consistent with the actual results detected on-site,indicating the validity of the numerical simulation results.
文摘The seventh Chinese international machine tool exhibition is hold in Peking. This exhibition has such characteristic that the machine tools are mainly numerical controlled ones, and that it is the general trend, that the machine tools have some functions of the personal computers, and that the exhibition of the five axle joint movement machine tools show that we have made a great break-through on the field, and that the nanometer machine tools draw so much attention on it and that the cutting speed are becoming higher and higher. The developing direction of our machine tool industry depends on strengthening to adjust the calling and that the enterprise must complete the reformation to itself and carrying forward enterprise informationizing and strenthening scientific research.
基金Supported by the National Natural Science Foundation entitled by The Impact of E-Commerce on Rural Social Network and Its Mechanism:A Case Study of Taobao Villages in Jiangsu Province(No.:51508365)the General Project of Natural Science Research in Jiangsu Province(No.:15KJB560012)Top-Notch Academic Programs Project of Jiangsu Higher Education Institutions(TAPP)
文摘With the e-commerce economy spreading to rural areas,Taobao villages in Jiangsu Province present a rapid development trend.This paper firstly summarizes the general development situation of Taobao villages in Jiangsu Province from the three aspects of quantity,product types,and spatial distribution.Then it analyzes the specific development characteristics of different product-based Taobao villages.Finally,from the four angles of industry bases,ecommerce platforms,e-commerce businessmen groups,and logistics support,it explores the driving mechanism of Taobao villages in Jiangsu Province and points out that more and more villages will be involved in the Internet revolution along with the further development of Internet and e-commerce.
基金Key Technology Research for Development and Efficient Cultivation and Utilization of Forage Mulberry(2013SZ03)
文摘The phenological phase, plant height, filler number, nutritional composition, yield and stem/leaf ratio of three oat (Arena sativa) varieties (lines) in winter dry land of Hunan were studied. The result shows that the three oat varieties were greatly different in plant height, nutritional composition, yield and stem/leaf ratio. Baiyan 7 had the best performance, with the plant height, tiller number and fresh yield of 101.67cm, 7.6 tiller/plant and 70.15 t/hm2 respectively ; the crude protein content of dry matter of Baiyan 7 was 32.63% ; the leaf weight per tiller of Baiyan 7 accounted for 31.6% of single tiller weight, while those of Baiyan 8 and Baiyan 2 accounted for 31.3% and 29.2%, respectively. The single tiller weight of oat could be estimated/calculated by the model/formula Y = 0.043 7X - 2.89 ( R2 = 0.913 4, P 〈 0.01 ), where Y is the single tiller weight ( g ) and X is the plant height (cm). Comprehensive analysis showed that Baiyan 7 had higher yields and stem/leaf ratio. Thus, Baiyan 7 is more suitable for planting as a winter-spring forage in the winter dry land of Hunan.
基金supported by Planning Project Fund of Ministry of Education on Humanities and Social Sciences (16YJAZH063)Zhejiang Provincial Natural Science Foundation (LY16D010008, LY15D010004)Zhejiang Provincial Philosophy and Social Science Planning Research (16NDJC211YB)
文摘In China, the Beautiful Countryside Development is a prototype of New Countryside Construction whose development mechanism is closely related to the urbanization level of the region. Regarding the consumption space production of the metropolis amid the accelerating process of urbanization since the 1990 s, the declination of traditional villages is just inevitable. Thus, under the circumstances of new urbanization, the development of traditional villages is more and more related to the expansion of urban consumption space and the modernization of agriculture, as proved by the formation of a concentric-radial pattern of rings of consumption spaces in the rural area surrounding Hangzhou. Taking three villages around Hangzhou as a typical example of the Beautiful Countryside Development, this paper puts forward a Beauty Index System to evaluate their development characteristics and analyzes their development mechanisms respectively. It proves that the three villages are all characterized by the integrity of both production space and consumption space, yet with different attributes in terms of human settlement, society and culture, and industrial structure. It concludes that this is the result of various driving forces which also result in the formation of a concentric-radial pattern of rings in rural areas amid urbanization.
文摘This paper makes a comprehensive analysis of the building of public library service brands in China since the initiation of the reform and opening up in 1978 and anticipate their future development in five aspects,i.e.,critical interpretation of its established culture and analysis of its characteristics,logic of the time,vivid practice,virtuous approaches,as well as future development.
文摘Chinese language teachers grow with certain characteristics in their professional development.Knowing these characteristics can reveal a teacher’s developmental needs which can inform the teachers and the teacher development facilitators.This case study examines the professional development of one Chinese language teacher that works in a high school in the United States.The Five-Stage Theory is employed to direct the examination of the teacher’s growing path.Findings cover the challenges,efforts to cope with the changes,successes,and failures.
文摘Urban forestry, which rose in the west in the latter half of the 20th century, is a type of forestry serving for city. Its important characteristic is that it makes through its narrow sense, or "urban afforestation", whose objective is to make city green and beautiful, and develops into a forestry system serving for the urban system. The consequence of rapid modern civilization is that skyscrapers concentrate in urban district and green space become narrower, resulting that