Soritia leptalina endangers mainly Quercus aquifolioides, and it became particularly rampant on Q. aquifolioides in Linzhi area, Tibet. By applying field investigation and lab analysis, this study explored the spatial...Soritia leptalina endangers mainly Quercus aquifolioides, and it became particularly rampant on Q. aquifolioides in Linzhi area, Tibet. By applying field investigation and lab analysis, this study explored the spatial distribution type and sampling technology of S. leptalina larvae on Q. aquifolioides. The results showed that insect density in the upper layer of tree canopy is higher than that in the middle and lower layer,that in the upper, middle and lower layer of different levels varies greatly, and insect density in different directions follows the sequence: east > north > west > south; spatial distribution of S. leptalina on Q.aquifolioides belongs to aggregation type, larvae show mutual repulsion; aggregation of S. leptalina is the result of biological characteristics of its larvae and the habitat environment; taking Iwa regression model as the basis, the optimal sampling quantity is determined. The study disclosed the spatial distribution rules of S.leptalina on Q. aquifolioides, and on the basis of which could provide the theoretical basis for preventing Q.aquifolioides from the damage of S. leptalina, and also scientific support for studying the spatial distribution pattern of this insect and its natural enemies on other hosts.展开更多
Pattern design and technology play a very important role in the garment industry. In order to improve the level of pattern making and design of the garment industry, a survey was conducted to investigate the industria...Pattern design and technology play a very important role in the garment industry. In order to improve the level of pattern making and design of the garment industry, a survey was conducted to investigate the industrial needs in pattern design and technology in China's Mainland. The data were collected from the employers and employees from the garment industry and students in the major of fashion and clothing studies. It indicated that there was a gap between the employer and employee, especially the requirements of the industrial needs and the course contents covered by the tertiary schools. The employers expected to recruit more experienced pattern designers, at the same time, they were not reluctant to hire fresh graduates and spent more resources on the training of employees. The students knew little about their employment situation of the garment industry, spent too little time on the course study and learned too little practical skills in pattern design. They could not make use of the knowledge which prevented them from being employed by the garment industry. Efforts should be taken by both the tertiary schools and the garment industry. The students should be aspirated towards the profession of pattern cutters and the syllabuses of pattern making should be more practical and industrial orientated. The solution might benefit the garment industry a lot in a long run.展开更多
The preparation of red,green,and blue quantum dot(QD)pixelated arrays with high precision,resolution,and brightness poses a significant challenge on the development of advanced micro-displays for virtual,augmented,and...The preparation of red,green,and blue quantum dot(QD)pixelated arrays with high precision,resolution,and brightness poses a significant challenge on the development of advanced micro-displays for virtual,augmented,and mixed reality applications.Alongside the controlled synthesis of high-performance QDs,a reliable QD patterning technology is crucial in overcoming this challenge.Among the various methods available,photolithography-based patterning technologies show great potentials in producing ultra-fine QD patterns at micron scale.This review article presents the recent advancements in the field of QD patterning using photolithography techniques and explores their applications in micro-display technology.Firstly,we discuss QD patterning through photolithography techniques employing photoresist(PR),which falls into two categories:PRassisted photolithography and photolithography of QDPR.Subsequently,direct photolithography techniques based on photo-induced crosslinking of photosensitive groups and photo-induced ligand cleavage mechanisms are thoroughly reviewed.Meanwhile,we assess the performance of QD arrays fabricated using these photolithography techniques and their integration into QD light emitting diode display devices as well as color conversionbased micro light emitting diode display devices.Lastly,we summarize the most recent developments in this field and outline future prospects.展开更多
The development of modern science and technology in China involved three transformations: from a traditional mindset to a modern one through the enlightenment of scientific thought, from the Anglo-Saxon pattern to the...The development of modern science and technology in China involved three transformations: from a traditional mindset to a modern one through the enlightenment of scientific thought, from the Anglo-Saxon pattern to the Soviet pattern in the process of instituting the Chinese system of science and technology, and from national defence to economics due to an awakening of technical economics after the ‘Cultural Revolution'. This paper surveys the political background of the second transformation. The idea of‘doing science for science's sake' never had a footing in China because the Chinese began to learn about modern science and technology only under the threat of colonists' gunboats. Developing science and technology has always been one of the means for China to cast off national humiliation and regain its status as a major country in the world. Compared with science and technology in other countries, Chinese science and technology were more susceptible to the international political environment and domestic political situation. It took about two decades, between the establishment of the Academia Sinica in 1928 and the inauguration of the Chinese Academy of Sciences in 1949, for China to form its system of science and technology. The system had three successive configurations because of the international competition among Japan, the US and the Soviet Union over China, and the domestic political contest between the Chinese Nationalist Party or Kuomintang(founded by Sun Yat-sen in 1912) and the Communist Party of China. China's science and technology system started by modelling itself on its counterparts in Europe and America. After undergoing a series of unconventional developments during the War of Resistance against Japanese Aggression(1931–1945) and the War of Liberation(1946–1949), the system transformed to the Soviet pattern after the establishment of the People's Republic of China.展开更多
Metal-organic frameworks(MOFs)are versatile materials with tunable pore structures,high surface areas,and diverse chemical functionalities,making them ideal for applications in catalysis,sensing,gas separation,and dru...Metal-organic frameworks(MOFs)are versatile materials with tunable pore structures,high surface areas,and diverse chemical functionalities,making them ideal for applications in catalysis,sensing,gas separation,and drug delivery.However,their bulk or powdered forms often limit performance due to poor dispersion and low functional integration.This challenge has driven the rapid development of MOF patterning techniques.This review explores various patterning methods,including template-induced growth method,printing techniques,conventional lithography and emerging direct photolithographic strategies,highlighting their principles,advantages,and limitations.We also discuss the broad applications of MOF patterning in energy devices,biosensors,and biomedical fields,emphasizing its potential in advancing performance.In addition,we address the challenge of balancing the quality of patterning resolution with the performance of MOF materials.By offering insights into both methodologies and applications,this review provides valuable guidance for researchers,fostering innovation in MOF-based multifunctional devices across diverse scientific fields.展开更多
A leading position in the areas of testing,instrumentation and machine control has been established by members of the British Textile Machinery Association(BTMA)and a number of new developments in these fields will be...A leading position in the areas of testing,instrumentation and machine control has been established by members of the British Textile Machinery Association(BTMA)and a number of new developments in these fields will be showcased at this year’s ITMA Asia+CITME exhibition,which takes place in Singapore from October 28-31.“Many of our members are currently developing new technologies,either in-house or increasingly through joint projects,and there will be much to reveal by the time of ITMA Asia in Singapore,”says BTMA CEO Jason Kent.“Some of the most recent developments are really going beyond what has previously been possible.”展开更多
Through discussing effective utilization of regional natural resources under the background of globalization,combining with Richard Rogers' typical architectural and urban design works,this study analyzes his desi...Through discussing effective utilization of regional natural resources under the background of globalization,combining with Richard Rogers' typical architectural and urban design works,this study analyzes his design concepts of using regional natural resources from the perspectives of overall balance between architecture and natural environment,architectural function and detail control,application of proper technologies and new materials,then proposes a modern design pattern to create a better urban living environment by integrating regional natural resources and modern architectural technology.展开更多
As a result of the fierceness of business competition, companies, to remaincompetitive, have to charm their customers by anticipating their needs and being able to rapidlydevelop exciting new products for them. To ove...As a result of the fierceness of business competition, companies, to remaincompetitive, have to charm their customers by anticipating their needs and being able to rapidlydevelop exciting new products for them. To overcome this challenge, technology forecasting isconsidered as a powerful tool in today's business environment, while there are as many successstories as there are failures, a good application of this method will give a good result. Amethodology of integration of patterns or lines of technology evolution in TRIZ parlance ispresented, which is also known as TRIZ technology forecasting, as input to the QFD process to designa new product. For this purpose, TRIZ technology forecasting, one of the TRIZ major tools, isdiscussed and some benefits compared to the traditional forecasting techniques are highlighted. Thena methodology to integrate TRIZ technology forecasting and QFD process is highlighted.展开更多
Three dimensional（3D） displacements, which can be translated further into 3D strain, are key parameters tor design, manufacturing and quality control. Using different optical setups, phase-shift methods, and algorit...Three dimensional（3D） displacements, which can be translated further into 3D strain, are key parameters tor design, manufacturing and quality control. Using different optical setups, phase-shift methods, and algorithms, several different 3D electronic speckle pattern interferometry（ESPl） systems for displacement and strain measurements have been achieved and commercialized. This paper provides a review of the recent developments in ESPI systems for 3D displacement and strain measurement. After an overview of the fundamentals of ESP! theory, temporal phase-shift, and spatial phase-shift techniques, 3D deformation measurements by the temporal phase-shift ESPI system, which is suited well for static measurement, and by the spatial phase-shift ESPI system, which is particularly useful for dynamic measurement, are discussed. For each method, the basic theory, a brief derivation and different optical layouts are presented. The state of art application, potential and limitation of the ESPI systems are shown and demonstrated.展开更多
In order to recognize the jamming pattern in anti-jamming, a novel fuzzy jamming recognition method based on statistic parameters of received signal’s power spectral density (PSD) is proposed. It exploits PSD’s shap...In order to recognize the jamming pattern in anti-jamming, a novel fuzzy jamming recognition method based on statistic parameters of received signal’s power spectral density (PSD) is proposed. It exploits PSD’s shape factor and skewness of received signal as classified characters of jamming pattern. After the mean center and variance of each jamming pattern are calculated by using some jamming samples, an exponential fuzzy membership function is used to calculate the membership value of the recognized sample. Finally, the jamming pattern of received signal is recognized by the maximum membership principle. The simulation results show that the proposed algorithm can recognize common eight jamming patterns accurately.展开更多
In this paper, a photoelectric signal obtained scheme via equator triangle pattern engraved on rotor is discussed and the mathematic model is deduced in the case which is deflexion between rotor axis and the coordinat...In this paper, a photoelectric signal obtained scheme via equator triangle pattern engraved on rotor is discussed and the mathematic model is deduced in the case which is deflexion between rotor axis and the coordinate frame of case. The deflexion error and coupling error under the situation are analyzed. Finally, three methods of engraving based on the spherical triangle pattern are presented. The error models of various methods are built up and the simulation curves are provided respectively. We have done the primary experiments on the surface of rotor using this method. It can be seen from the enlarged figures that the rim of the pattern is smooth and the demand of sensor resolution is satisfied by and large. The results of study supply reference for signal obtaining.展开更多
A low cost of die area and power consumption CMOS image sensor readout circuit with fixed pattern noise(FPN) cancellation is proposed.By using only one coupling capacitor and switch in the double FPN cancelling correl...A low cost of die area and power consumption CMOS image sensor readout circuit with fixed pattern noise(FPN) cancellation is proposed.By using only one coupling capacitor and switch in the double FPN cancelling correlative double sampling(CDS),pixel FPN is cancelled and column FPN is stored and eliminated by the sampleand-hold operation of digitally programmable gain amplifier(DPGA).The bandwidth balance technology based on operational amplifier(op-amp) sharing is also introduced to decrease the power dissi...展开更多
Economic and technological development zone and high-tech industrial zone are important types of development zone in China,and there are differences in their connotation and goal setting.In this paper,basic data of na...Economic and technological development zone and high-tech industrial zone are important types of development zone in China,and there are differences in their connotation and goal setting.In this paper,basic data of national and provincial economic and technological development zones and high-tech industrial zones in China were collected and arranged.Kernel density analysis and other GIS spatial analysis techniques were used to analyze the evolution laws of spatial patterns of economic and technological development zones and high-tech industrial zones in cities from 2006 to 2018.First,the agglomeration intensity was compared by measuring the degree of regional agglomeration and dispersion on the two time nodes.Next,kernel density method was used to explore the evolution of the two in the spatial layout and location,and analyze development commonness and difference of economic and technological development zones and high-tech industrial zones.Finally,the trend and reason of spatial evolution of development zones with different leading industries were explored.Research results show that:①the agglomeration degree of layout of high-tech industrial zones is stronger than that of economic and technological development zones,and there are similarities and differences in distribution trend of spatial patterns of the two types of development zones;②the distribution of labor-intensive,capital-intensive and technology-intensive development zones is concentrated at smaller scales and dispersed at larger ones;③although there are differences between the economic and technological development zones and the high-tech industrial zones in the goal,support,structure and function,management system and so on,their spatial development presents a trend of convergence.In the future,when enhancing urban-rural planning and public administration,governments should combine the trend of industrial transformation and upgrading,and optimize spatial layout of development zones by adjusting industrial structure,layout,transportation and land use.展开更多
The key to realize the commercial production of natural gas hydrate(NGH)is to increase theNGH productivity significantly in the scale of magnitude.Whether NGH production can be commercialized depends on two aspects.Th...The key to realize the commercial production of natural gas hydrate(NGH)is to increase theNGH productivity significantly in the scale of magnitude.Whether NGH production can be commercialized depends on two aspects.The first is whether the in-situ recoverable reserves are large enough to support the basic production period for commercial production.The second is whether the average productivity can reach the standard for commercial production.In this paper,we will analyze mainly about the potential stimulation technologies for NGH development,and discuss about the basic principles,the evaluation methods,and the technical bottlenecks for NGH production and stimulation.The results indicate that the main mechanisms for increasing theNGH productivity are in three respects,namely enlarging the drainage area,increasing the NGH dissociation efficiency,and improving the seepage conditions.With complex-structure wells and multiple-well patterns,combined with novel production methods and/or reservoir stimulation technologies,the NGH productivity can be increased greatly.Particularly,the complexstructure wells and well patterns are very important for increasing NGH productivity.With complex-structure wells and well patterns,combined with heat injection and/or reservoir stimulation,NGH productivity can be increased on a magnitude scale.Currently,in fundamental researches,there are some technical bottlenecks for the studies of NGH production,mainly in sample preparation,simulated reservoir monitoring,and mechanical coupling technologies.Therefore,it is suggested that the study focuses should be on the above technical bottlenecks during the basic research on how to increase the NGH productivity.It is concluded that the combined application of complex-structure wells(horizontal wells and multi-lateral wells),well-pattern production models(with multi-cluster/group well production),the novel production methods(mainly thermal stimulation,together with depressurization),and reservoir stimulation technologies(hydraulic fracturing)are the keys to increase NGH productivity in the scale of magnitude.展开更多
基金Sponsored by National Natural Science Foundation of China(31460200)Natural Science Foundation of Tibet(2014-2015)
文摘Soritia leptalina endangers mainly Quercus aquifolioides, and it became particularly rampant on Q. aquifolioides in Linzhi area, Tibet. By applying field investigation and lab analysis, this study explored the spatial distribution type and sampling technology of S. leptalina larvae on Q. aquifolioides. The results showed that insect density in the upper layer of tree canopy is higher than that in the middle and lower layer,that in the upper, middle and lower layer of different levels varies greatly, and insect density in different directions follows the sequence: east > north > west > south; spatial distribution of S. leptalina on Q.aquifolioides belongs to aggregation type, larvae show mutual repulsion; aggregation of S. leptalina is the result of biological characteristics of its larvae and the habitat environment; taking Iwa regression model as the basis, the optimal sampling quantity is determined. The study disclosed the spatial distribution rules of S.leptalina on Q. aquifolioides, and on the basis of which could provide the theoretical basis for preventing Q.aquifolioides from the damage of S. leptalina, and also scientific support for studying the spatial distribution pattern of this insect and its natural enemies on other hosts.
文摘Pattern design and technology play a very important role in the garment industry. In order to improve the level of pattern making and design of the garment industry, a survey was conducted to investigate the industrial needs in pattern design and technology in China's Mainland. The data were collected from the employers and employees from the garment industry and students in the major of fashion and clothing studies. It indicated that there was a gap between the employer and employee, especially the requirements of the industrial needs and the course contents covered by the tertiary schools. The employers expected to recruit more experienced pattern designers, at the same time, they were not reluctant to hire fresh graduates and spent more resources on the training of employees. The students knew little about their employment situation of the garment industry, spent too little time on the course study and learned too little practical skills in pattern design. They could not make use of the knowledge which prevented them from being employed by the garment industry. Efforts should be taken by both the tertiary schools and the garment industry. The students should be aspirated towards the profession of pattern cutters and the syllabuses of pattern making should be more practical and industrial orientated. The solution might benefit the garment industry a lot in a long run.
基金supported by the National Natural Science Foundation of China(62374142,12175189 and 11904302)External Cooperation Program of Fujian(2022I0004)+1 种基金Fundamental Research Funds for the Central Universities(20720190005 and 20720220085)Major Science and Technology Project of Xiamen in China(3502Z20191015).
文摘The preparation of red,green,and blue quantum dot(QD)pixelated arrays with high precision,resolution,and brightness poses a significant challenge on the development of advanced micro-displays for virtual,augmented,and mixed reality applications.Alongside the controlled synthesis of high-performance QDs,a reliable QD patterning technology is crucial in overcoming this challenge.Among the various methods available,photolithography-based patterning technologies show great potentials in producing ultra-fine QD patterns at micron scale.This review article presents the recent advancements in the field of QD patterning using photolithography techniques and explores their applications in micro-display technology.Firstly,we discuss QD patterning through photolithography techniques employing photoresist(PR),which falls into two categories:PRassisted photolithography and photolithography of QDPR.Subsequently,direct photolithography techniques based on photo-induced crosslinking of photosensitive groups and photo-induced ligand cleavage mechanisms are thoroughly reviewed.Meanwhile,we assess the performance of QD arrays fabricated using these photolithography techniques and their integration into QD light emitting diode display devices as well as color conversionbased micro light emitting diode display devices.Lastly,we summarize the most recent developments in this field and outline future prospects.
文摘The development of modern science and technology in China involved three transformations: from a traditional mindset to a modern one through the enlightenment of scientific thought, from the Anglo-Saxon pattern to the Soviet pattern in the process of instituting the Chinese system of science and technology, and from national defence to economics due to an awakening of technical economics after the ‘Cultural Revolution'. This paper surveys the political background of the second transformation. The idea of‘doing science for science's sake' never had a footing in China because the Chinese began to learn about modern science and technology only under the threat of colonists' gunboats. Developing science and technology has always been one of the means for China to cast off national humiliation and regain its status as a major country in the world. Compared with science and technology in other countries, Chinese science and technology were more susceptible to the international political environment and domestic political situation. It took about two decades, between the establishment of the Academia Sinica in 1928 and the inauguration of the Chinese Academy of Sciences in 1949, for China to form its system of science and technology. The system had three successive configurations because of the international competition among Japan, the US and the Soviet Union over China, and the domestic political contest between the Chinese Nationalist Party or Kuomintang(founded by Sun Yat-sen in 1912) and the Communist Party of China. China's science and technology system started by modelling itself on its counterparts in Europe and America. After undergoing a series of unconventional developments during the War of Resistance against Japanese Aggression(1931–1945) and the War of Liberation(1946–1949), the system transformed to the Soviet pattern after the establishment of the People's Republic of China.
基金supported by the Science and Technology Program in Jiangsu Province(No.BK20232041)the National Key Research and Development Program of China(No.2022YFB3607000)the National Natural Science Foundation of China(Nos.22171132 and 52472165).
文摘Metal-organic frameworks(MOFs)are versatile materials with tunable pore structures,high surface areas,and diverse chemical functionalities,making them ideal for applications in catalysis,sensing,gas separation,and drug delivery.However,their bulk or powdered forms often limit performance due to poor dispersion and low functional integration.This challenge has driven the rapid development of MOF patterning techniques.This review explores various patterning methods,including template-induced growth method,printing techniques,conventional lithography and emerging direct photolithographic strategies,highlighting their principles,advantages,and limitations.We also discuss the broad applications of MOF patterning in energy devices,biosensors,and biomedical fields,emphasizing its potential in advancing performance.In addition,we address the challenge of balancing the quality of patterning resolution with the performance of MOF materials.By offering insights into both methodologies and applications,this review provides valuable guidance for researchers,fostering innovation in MOF-based multifunctional devices across diverse scientific fields.
文摘A leading position in the areas of testing,instrumentation and machine control has been established by members of the British Textile Machinery Association(BTMA)and a number of new developments in these fields will be showcased at this year’s ITMA Asia+CITME exhibition,which takes place in Singapore from October 28-31.“Many of our members are currently developing new technologies,either in-house or increasingly through joint projects,and there will be much to reveal by the time of ITMA Asia in Singapore,”says BTMA CEO Jason Kent.“Some of the most recent developments are really going beyond what has previously been possible.”
基金Supported by Programs of Humanities and Social Sciences,the Ministry of Education (10YJCZH132)Henan Provincial Program for Tackling Key Scientific and Technological Problems (102102310414)Decision Research Program of Henan Provincial Government (2011B795)~~
文摘Through discussing effective utilization of regional natural resources under the background of globalization,combining with Richard Rogers' typical architectural and urban design works,this study analyzes his design concepts of using regional natural resources from the perspectives of overall balance between architecture and natural environment,architectural function and detail control,application of proper technologies and new materials,then proposes a modern design pattern to create a better urban living environment by integrating regional natural resources and modern architectural technology.
基金This project is supported by National Natural Science Foundation of China(No.20172041) and Provincial Science Foundation of Anhui, China (No.03042308).
文摘As a result of the fierceness of business competition, companies, to remaincompetitive, have to charm their customers by anticipating their needs and being able to rapidlydevelop exciting new products for them. To overcome this challenge, technology forecasting isconsidered as a powerful tool in today's business environment, while there are as many successstories as there are failures, a good application of this method will give a good result. Amethodology of integration of patterns or lines of technology evolution in TRIZ parlance ispresented, which is also known as TRIZ technology forecasting, as input to the QFD process to designa new product. For this purpose, TRIZ technology forecasting, one of the TRIZ major tools, isdiscussed and some benefits compared to the traditional forecasting techniques are highlighted. Thena methodology to integrate TRIZ technology forecasting and QFD process is highlighted.
基金supported by National Natural Science Foundation of China(Grant Nos.51275054,51075116)
文摘Three dimensional（3D） displacements, which can be translated further into 3D strain, are key parameters tor design, manufacturing and quality control. Using different optical setups, phase-shift methods, and algorithms, several different 3D electronic speckle pattern interferometry（ESPl） systems for displacement and strain measurements have been achieved and commercialized. This paper provides a review of the recent developments in ESPI systems for 3D displacement and strain measurement. After an overview of the fundamentals of ESP! theory, temporal phase-shift, and spatial phase-shift techniques, 3D deformation measurements by the temporal phase-shift ESPI system, which is suited well for static measurement, and by the spatial phase-shift ESPI system, which is particularly useful for dynamic measurement, are discussed. For each method, the basic theory, a brief derivation and different optical layouts are presented. The state of art application, potential and limitation of the ESPI systems are shown and demonstrated.
基金Sponsored by National Nature Science Foundation of China ( 61072078)China Postdoctoral Science Foundation Funded Project ( 20090461426)Jiangsu Planned Projects for Postdoctoral Research Funds ( 0902039C)
文摘In order to recognize the jamming pattern in anti-jamming, a novel fuzzy jamming recognition method based on statistic parameters of received signal’s power spectral density (PSD) is proposed. It exploits PSD’s shape factor and skewness of received signal as classified characters of jamming pattern. After the mean center and variance of each jamming pattern are calculated by using some jamming samples, an exponential fuzzy membership function is used to calculate the membership value of the recognized sample. Finally, the jamming pattern of received signal is recognized by the maximum membership principle. The simulation results show that the proposed algorithm can recognize common eight jamming patterns accurately.
文摘In this paper, a photoelectric signal obtained scheme via equator triangle pattern engraved on rotor is discussed and the mathematic model is deduced in the case which is deflexion between rotor axis and the coordinate frame of case. The deflexion error and coupling error under the situation are analyzed. Finally, three methods of engraving based on the spherical triangle pattern are presented. The error models of various methods are built up and the simulation curves are provided respectively. We have done the primary experiments on the surface of rotor using this method. It can be seen from the enlarged figures that the rim of the pattern is smooth and the demand of sensor resolution is satisfied by and large. The results of study supply reference for signal obtaining.
基金Supported by National Natural Science Foundation of China (No.60806010,No.60976030)Tianjin Innovation Special Funds for Science and Technology (No.05FZZDGX00200)
文摘A low cost of die area and power consumption CMOS image sensor readout circuit with fixed pattern noise(FPN) cancellation is proposed.By using only one coupling capacitor and switch in the double FPN cancelling correlative double sampling(CDS),pixel FPN is cancelled and column FPN is stored and eliminated by the sampleand-hold operation of digitally programmable gain amplifier(DPGA).The bandwidth balance technology based on operational amplifier(op-amp) sharing is also introduced to decrease the power dissi...
基金Sponsored by Peking University (Shenzhen) Future City Lab Tiehan Research Fund。
文摘Economic and technological development zone and high-tech industrial zone are important types of development zone in China,and there are differences in their connotation and goal setting.In this paper,basic data of national and provincial economic and technological development zones and high-tech industrial zones in China were collected and arranged.Kernel density analysis and other GIS spatial analysis techniques were used to analyze the evolution laws of spatial patterns of economic and technological development zones and high-tech industrial zones in cities from 2006 to 2018.First,the agglomeration intensity was compared by measuring the degree of regional agglomeration and dispersion on the two time nodes.Next,kernel density method was used to explore the evolution of the two in the spatial layout and location,and analyze development commonness and difference of economic and technological development zones and high-tech industrial zones.Finally,the trend and reason of spatial evolution of development zones with different leading industries were explored.Research results show that:①the agglomeration degree of layout of high-tech industrial zones is stronger than that of economic and technological development zones,and there are similarities and differences in distribution trend of spatial patterns of the two types of development zones;②the distribution of labor-intensive,capital-intensive and technology-intensive development zones is concentrated at smaller scales and dispersed at larger ones;③although there are differences between the economic and technological development zones and the high-tech industrial zones in the goal,support,structure and function,management system and so on,their spatial development presents a trend of convergence.In the future,when enhancing urban-rural planning and public administration,governments should combine the trend of industrial transformation and upgrading,and optimize spatial layout of development zones by adjusting industrial structure,layout,transportation and land use.
基金Project supported by the National Key R&D Project“Application Demonstration of Trial Production,Environmental Monitoring and Comprehensive Evaluation of Hydrate”(No.:2017YFC0307600)Shandong Provincial Taishan Scholars Special Expert Project(No.ts201712079)Shandong Provincial Natural Science Foundation Project“Numerical Simulation of the Influence of Hydraulic Cutting on the Productivity of Depressurization Production of Silty Hydrate in the South China Sea”(No.ZR2019BD058).
文摘The key to realize the commercial production of natural gas hydrate(NGH)is to increase theNGH productivity significantly in the scale of magnitude.Whether NGH production can be commercialized depends on two aspects.The first is whether the in-situ recoverable reserves are large enough to support the basic production period for commercial production.The second is whether the average productivity can reach the standard for commercial production.In this paper,we will analyze mainly about the potential stimulation technologies for NGH development,and discuss about the basic principles,the evaluation methods,and the technical bottlenecks for NGH production and stimulation.The results indicate that the main mechanisms for increasing theNGH productivity are in three respects,namely enlarging the drainage area,increasing the NGH dissociation efficiency,and improving the seepage conditions.With complex-structure wells and multiple-well patterns,combined with novel production methods and/or reservoir stimulation technologies,the NGH productivity can be increased greatly.Particularly,the complexstructure wells and well patterns are very important for increasing NGH productivity.With complex-structure wells and well patterns,combined with heat injection and/or reservoir stimulation,NGH productivity can be increased on a magnitude scale.Currently,in fundamental researches,there are some technical bottlenecks for the studies of NGH production,mainly in sample preparation,simulated reservoir monitoring,and mechanical coupling technologies.Therefore,it is suggested that the study focuses should be on the above technical bottlenecks during the basic research on how to increase the NGH productivity.It is concluded that the combined application of complex-structure wells(horizontal wells and multi-lateral wells),well-pattern production models(with multi-cluster/group well production),the novel production methods(mainly thermal stimulation,together with depressurization),and reservoir stimulation technologies(hydraulic fracturing)are the keys to increase NGH productivity in the scale of magnitude.
