The study analyses the theoretical mechanism through which environmental regulation affects the dairy industry’s technological progress,with a particular focus on how the effect is conditional on farm size.Using the ...The study analyses the theoretical mechanism through which environmental regulation affects the dairy industry’s technological progress,with a particular focus on how the effect is conditional on farm size.Using the input–output data of dairy farms of different sizes from 2009 to 2019 in 10 Chinese provinces/autonomous regions in China and the quantitative measurement index of environmental regulation,the study estimates environmental regulation’s heterogeneous influences on the dairy industry’s technological progress by dynamic panel data models.The empirical results suggest that,first,environmental regulation has a U-type influence on the technological progress of dairy farming.The U-type influence means moving from pollution control’s high cost and low technology progress to the high profit and high innovation input generated by optimizing the breeding structure.Second,the promotion of dairy farming technology depends on farm size.The effect of environmental regulation on technological progress in moderately large-farms showed a U-type relationship.In contrast,the effect in free-range and large-size dairy farms showed a linear and positive relationship.The government should further strengthen environmental regulation based on advancing moderately large-farms in compliance with market mechanisms in the long run.Particular attention should be paid to the forms of environmental regulation so that dairy cattle breeding technology can break through the inflection point of the“U”curve as soon as possible and ensure the significance of the rising stage.Along the way,technical support should be provided for realizing environmental protection and economic growth.展开更多
Based on the DEA-based Malmquist index method,the total factor productivity was calculated for 5 major banana production areas in 2003-2004,and it was further divided into technological progress and technical efficien...Based on the DEA-based Malmquist index method,the total factor productivity was calculated for 5 major banana production areas in 2003-2004,and it was further divided into technological progress and technical efficiency.The results show that the total factor productivity of banana industry in China was 1.3% in the sample period,mainly due to technological progress,the average growth rate was 2.6%,while the pure technical efficiency and scale efficiency was -0.1% and -1.2% respectively.The improvement of total factor productivity in banana industry in China relied mainly on technological progress,cultivation of new banana varieties,management of high quality cultivation,popularization and application of water conservation and fertilizer saving technology,and injury-free picking technologies.The pure technical efficiency and scale efficiency of banana production were negative,indicating that the management level of banana was not high.The effect of scale economy of this industry through agglomeration and consolidation is still to be practiced.Banana growers should promote the improvement of large scale and management level of the banana industry at the same time of promoting the technological progress.展开更多
The enhancement of industrial green total factor productivity is pivotal for achieving high-quality and sustainable economic development.This study assesses China’s performance using the SBM-GML model,employing provi...The enhancement of industrial green total factor productivity is pivotal for achieving high-quality and sustainable economic development.This study assesses China’s performance using the SBM-GML model,employing province-level panel data spanning from 2004 to 2020.Furthermore,we examine the influence of green finance and technological progress on industrial green total factor productivity using a spatial econometric model.The findings uncover that the relationship between the level of green financial development and industrial green total factor productivity follows a U-shaped curve.Initially,low levels of green financial development exert a suppressive effect on industrial green total factor productivity,proving ineffective in the short term.However,with the progression of green finance development,a positive and significant long-term impact on industrial green total factor productivity emerges.Moreover,technological progress demonstrates a noteworthy promotional effect on industrial green total factor productivity.The analysis delves deeper into revealing that industrial structure and environmental regulation intensity exhibit a significant negative relationship with industrial green total factor productivity.In contrast,both energy structure and education level showcase a substantial positive relationship with industrial green total factor productivity.展开更多
The work of quantitative studying the effect of technological progress on economic growth, being of great complexity and far-reaching significance, has become a quite popular research topic in the world. In recent yea...The work of quantitative studying the effect of technological progress on economic growth, being of great complexity and far-reaching significance, has become a quite popular research topic in the world. In recent years there are a large number of scientists who are engaged in this research both at home and abroad.展开更多
A necessary condition for realizing macroeconomics is to rationally upgrade the industrial structure.In this process of upgrading,financial capital deepening and technological progress are important ways to promote th...A necessary condition for realizing macroeconomics is to rationally upgrade the industrial structure.In this process of upgrading,financial capital deepening and technological progress are important ways to promote the upgrading of industrial structure.From an endogenous perspective,this essay explores the internal links between financial capital deepening,technological progress,and industrial structure upgrading.The analysis shows that factors of technological progress have not make a tremendous impact on the upgrading of Chinese industrial structure,nor are they a positive reason for promoting the development of the industry to a higher level.The deepening of financial capital obviously promotes the optimization and upgrading of industrial institutions,which is its main factor.展开更多
With the continuous growth of the global population and the acceleration of urbanization,traditional agriculture faces severe challenges,such as labor shortages,low efficiency in agricultural resource utilization,and ...With the continuous growth of the global population and the acceleration of urbanization,traditional agriculture faces severe challenges,such as labor shortages,low efficiency in agricultural resource utilization,and uncertainties caused by climate change.Unmanned agricultural machinery,as an integral part of smart agriculture,utilizes automation and intelligent technologies to achieve precise control over the entire agricultural production process,improving production efficiency,reducing labor costs,minimizing environmental impacts,and enhancing sustainability.In recent years,with advancements in information technology,artificial intelligence,and the Internet of Things,unmanned agricultural machinery has made significant technological progress and has gradually entered the commercialization stage.This study aims to analyze the technological advancements and development trends of unmanned agricultural machinery and explore its application prospects in practical production.By investigating this emerging technology,the research not only provides a theoretical foundation for agricultural technological innovation but also offers practical references for policymakers,agricultural enterprises,and practitioners.Particularly in the critical period of global agricultural transformation,research on unmanned agricultural machinery holds significant economic,environmental,and social value.展开更多
Mid-deep geothermal reinjection technology is crucial for the sustainable development of geothermal resources,which has garnered significant attention and rapid growth in recent years.Currently,various geothermal rein...Mid-deep geothermal reinjection technology is crucial for the sustainable development of geothermal resources,which has garnered significant attention and rapid growth in recent years.Currently,various geothermal reinjection technologies lag behind,lacking effective integration to address issues like low reinjection rates and thermal breakthrough.This paper reviews the basic principles and development history of mid-deep geothermal reinjection technology,focusing on various technical methods used in the process and analyzing their applicability,advantages,and disadvantages under different geological conditions.It highlights the unique challenges posed by deep geothermal resources,including high temperature,high pressure,high stress,chemical corrosion,and complex geological structures.Additionally,it addresses challenges in equipment selection and durability,system stability and operation safety,environmental impact,and sustainable development.Finally,the paper explores future directions for mid-deep geothermal reinjection technology,highlighting key areas for further research and potential pathways for technological innovation.This comprehensive analysis aims to accelerate the advancement of geothermal reinjection technology,offering essential guidance for the efficient reinjection and sustainable development of geothermal resources.展开更多
The governance of state-owned enterprises(SOEs)has long been central to political and institutional economic debates.Critics often associate SOEs with ine"ciency,rent-seeking and dogma,treating them as relics of ...The governance of state-owned enterprises(SOEs)has long been central to political and institutional economic debates.Critics often associate SOEs with ine"ciency,rent-seeking and dogma,treating them as relics of command economies.Yet in many developmental states,they have been engines of industrialisation,technological progress and national resilience.China provides perhaps the most striking example.Its SOEs have survived and evolved,some becoming globally competitive multinationals in energy,infrastructure and telecommunications.展开更多
SELECTED REMARKS OF CHINESE PRESIDENT XI JINPING On 28 March,Chinese President Xi Jinping met with representatives of the international business community in Beijing.He welcomed them to China,and commended them for th...SELECTED REMARKS OF CHINESE PRESIDENT XI JINPING On 28 March,Chinese President Xi Jinping met with representatives of the international business community in Beijing.He welcomed them to China,and commended them for their long-standing commitment to cooperation with China.President Xi Jinping noted that foreign businesses and investment in China have driven economic growth and employment,boosted technological and managerial progress,and facilitated reform and opening up.展开更多
Economic globalization is a process of forming a global market under the conditions of technological progress and national opening-up.Influenced by factors such as national policies,the international environment and g...Economic globalization is a process of forming a global market under the conditions of technological progress and national opening-up.Influenced by factors such as national policies,the international environment and geopolitics,the values,concepts and choices of the participants of globalization will change accordingly,thus affecting the mode,scale and speed of globalization.展开更多
Strong provincial capital is an important initiative for underdeveloped regions to realize rapid regional economic development through leading by point,which is related to the overall situation of China's economic...Strong provincial capital is an important initiative for underdeveloped regions to realize rapid regional economic development through leading by point,which is related to the overall situation of China's economic high-quality development.This paper theoretically analyzes the internal mechanism of strong provincial capitals affecting regional innovation efficiency.The study finds that the policy of strong provincial capitals promotes the formation of the resource aggregation effect in the capital cities,attracts talents,technologies,policies,and capital and other factors,improves the efficiency and quality of innovation,and drives the development of neighboring regions.However,over-implementation of the policy will lead to a large number of big enterprises,"which will lead to rent-seeking,waste of resources,crowding out of government subsidies and congestion effects,inhibit innovation,and lead to the loss of innovation factors in peripheral cities,dragging down the innovation level of the whole province.Therefore,the relationship between strong provincial capitals and innovation is an inverted"U"shape,and this study is of great significance for understanding the double-edged sword effect of strong provincial capitals and formulating scientific regional innovation policies.展开更多
Marx's theory of scientific and technological progress and utilization of natural resources is an indispensable and important part of Marx's economic theory.To realize the harmonious unification of man and nat...Marx's theory of scientific and technological progress and utilization of natural resources is an indispensable and important part of Marx's economic theory.To realize the harmonious unification of man and nature,man must correctly understand the effect of scientific and technological progress on the use of natural resources,fundamentally solve the problem that scientific and technological progress cannot replace the position of natural resources in economic development,and objectively evaluate the relationship between human power and the power of nature.Grasping and comprehending the scientific connotation of Marx's theory of scientific and technological progress and utilization of natural resources has a very important theoretical value and practical significance for saving and effectively using natural resources and building an environment-friendly society.展开更多
Based on the macroanalysis of the unbalanced development of the"demand side"and the"supply side"of clinical medicine in China,this paper elucidates the stakeholders,resources,and ecosystem of the s...Based on the macroanalysis of the unbalanced development of the"demand side"and the"supply side"of clinical medicine in China,this paper elucidates the stakeholders,resources,and ecosystem of the strategic scientific and technological capacity-building and calls for a larger coverage,smoother supply chain,and more sustainable ecosystem to ensure the development of clinical medicine.Furthermore,focusing on the establishment and development of clinical reproductive health in China,the authors introduce the strategic scientific and technological capacity-building of reproductive medicine in Peking University Third Hospital,with an attempt to inform similar efforts in other fields and even the whole clinical medicine in China.展开更多
By reviewing the mechanisms of drilling fluid lost circulation and its control in fractured formations, the applicability and working mechanisms of different kinds of lost circulation materials in plugging fractured f...By reviewing the mechanisms of drilling fluid lost circulation and its control in fractured formations, the applicability and working mechanisms of different kinds of lost circulation materials in plugging fractured formations have been summarized. Meanwhile, based on the types of lost circulation materials, the advantages, disadvantages, and application effects of corresponding plugging technologies have been analyzed to sort out the key problems existing in the current lost circulation control technologies. On this basis, the development direction of plugging technology for severe loss have been pointed out. It is suggested that that the lost circulation control technology should combine different disciplines such as geology, engineering and materials to realize integration, intelligence and systematization in the future. Five research aspects should be focused on:(1) the study on mechanisms of drilling fluid lost circulation and its control to provide basis for scientific selection of lost circulation material formulas, control methods and processes;(2) the research and development of self-adaptive lost circulation materials to improve the matching relationship between lost control materials and fracture scales;(3) the research and development of lost circulation materials with strong retention and strong filling in three-dimensional fracture space, to enhance the retention and filling capacities of materials in fractures and improve the lost circulation control effect;(4) the research and development of lost circulation materials with high temperature tolerance, to ensure the long-term plugging effect of deep high-temperature formations;(5) the study on digital and intelligent lost circulation control technology, to promote the development of lost circulation control technology to digital and intelligent direction.展开更多
Liquid propellant rocket engines for a launch vehicle are an essential aerospace technology, representing the advanced level of hi-tech in a country. In recent years, China’s aerospace industry has made remarkable ac...Liquid propellant rocket engines for a launch vehicle are an essential aerospace technology, representing the advanced level of hi-tech in a country. In recent years, China’s aerospace industry has made remarkable achievements, and liquid rocket engine technology has also been effectively developed. In this article, the development processes of China’s liquid rocket engines are discussed. Then, the performance features of China’s new generation liquid rocket engines as well as the flight tests of the new-generation launch vehicles are introduced. Finally, the development direction and the most recent progress of the next generation large-thrust liquid rocket engine is presented.展开更多
In China, currently there are more than 100 million videos being watched everyday on the Internet. There are three kinds of Internet videos: video sharing, Video on Demand (VoD), and Peer-to-Peer (P2P) streaming media...In China, currently there are more than 100 million videos being watched everyday on the Internet. There are three kinds of Internet videos: video sharing, Video on Demand (VoD), and Peer-to-Peer (P2P) streaming media. Video sharing is based on browser/server mode, severing user generated content. VoD is based on client/server mode and needs to be paid for. P2P streaming media is based on P2P mode service for hot content. To address P2P traffic optimization and content regulation, China National Information Technology Standardization Technical Committee sets up P2P working group to make relevant standards.展开更多
Welding in aviation industry has become one of the dominate processing technologies for manufacturing flying apparatus.The percentage of welded structures in designs of new flying apparatus has been continuously grow...Welding in aviation industry has become one of the dominate processing technologies for manufacturing flying apparatus.The percentage of welded structures in designs of new flying apparatus has been continuously growing up.Welding technology provides a freedom and guarantee to new structure design and new material application. Technical and economic benefits have been obtaining in application of newly developed welding technologies and achievements in research, such as, SPF/DB,electron beam welding, breezing,low stress nondistortion welding etc.展开更多
1 Significance of All Solid State Laser (DPL) Technology in Field of LaserBecause of the advantages of high conversion efficiency, good beam quality, small size and light weight, DPL becomes the hotspot and priority o...1 Significance of All Solid State Laser (DPL) Technology in Field of LaserBecause of the advantages of high conversion efficiency, good beam quality, small size and light weight, DPL becomes the hotspot and priority of development of laser technology. It may be the main body of laser in the future and replace gas laser and liquid laser. It is a great revolution of laser technology.The developed countries vie in developing DPL. China has achieved great success in this field, but there is a wide gap between the developed countries and us. We should attach great importance to it.展开更多
基金supported by the Ministry of Agriculture and Rural Affairs,China(125D0301)。
文摘The study analyses the theoretical mechanism through which environmental regulation affects the dairy industry’s technological progress,with a particular focus on how the effect is conditional on farm size.Using the input–output data of dairy farms of different sizes from 2009 to 2019 in 10 Chinese provinces/autonomous regions in China and the quantitative measurement index of environmental regulation,the study estimates environmental regulation’s heterogeneous influences on the dairy industry’s technological progress by dynamic panel data models.The empirical results suggest that,first,environmental regulation has a U-type influence on the technological progress of dairy farming.The U-type influence means moving from pollution control’s high cost and low technology progress to the high profit and high innovation input generated by optimizing the breeding structure.Second,the promotion of dairy farming technology depends on farm size.The effect of environmental regulation on technological progress in moderately large-farms showed a U-type relationship.In contrast,the effect in free-range and large-size dairy farms showed a linear and positive relationship.The government should further strengthen environmental regulation based on advancing moderately large-farms in compliance with market mechanisms in the long run.Particular attention should be paid to the forms of environmental regulation so that dairy cattle breeding technology can break through the inflection point of the“U”curve as soon as possible and ensure the significance of the rising stage.Along the way,technical support should be provided for realizing environmental protection and economic growth.
基金Supported by Industrial Economic Post of National Banana Industrial Technological System of the Ministry of Agriculture(CARS-32-10)
文摘Based on the DEA-based Malmquist index method,the total factor productivity was calculated for 5 major banana production areas in 2003-2004,and it was further divided into technological progress and technical efficiency.The results show that the total factor productivity of banana industry in China was 1.3% in the sample period,mainly due to technological progress,the average growth rate was 2.6%,while the pure technical efficiency and scale efficiency was -0.1% and -1.2% respectively.The improvement of total factor productivity in banana industry in China relied mainly on technological progress,cultivation of new banana varieties,management of high quality cultivation,popularization and application of water conservation and fertilizer saving technology,and injury-free picking technologies.The pure technical efficiency and scale efficiency of banana production were negative,indicating that the management level of banana was not high.The effect of scale economy of this industry through agglomeration and consolidation is still to be practiced.Banana growers should promote the improvement of large scale and management level of the banana industry at the same time of promoting the technological progress.
基金General Research Fund of Philosophy and Social Sciences in Colleges and Universities of Jiangsu Province in 2020(Grant Number 2020SJA1008)Fundamental Research Funds for the Central Universities(Grant Number 2023SK04)。
文摘The enhancement of industrial green total factor productivity is pivotal for achieving high-quality and sustainable economic development.This study assesses China’s performance using the SBM-GML model,employing province-level panel data spanning from 2004 to 2020.Furthermore,we examine the influence of green finance and technological progress on industrial green total factor productivity using a spatial econometric model.The findings uncover that the relationship between the level of green financial development and industrial green total factor productivity follows a U-shaped curve.Initially,low levels of green financial development exert a suppressive effect on industrial green total factor productivity,proving ineffective in the short term.However,with the progression of green finance development,a positive and significant long-term impact on industrial green total factor productivity emerges.Moreover,technological progress demonstrates a noteworthy promotional effect on industrial green total factor productivity.The analysis delves deeper into revealing that industrial structure and environmental regulation intensity exhibit a significant negative relationship with industrial green total factor productivity.In contrast,both energy structure and education level showcase a substantial positive relationship with industrial green total factor productivity.
文摘The work of quantitative studying the effect of technological progress on economic growth, being of great complexity and far-reaching significance, has become a quite popular research topic in the world. In recent years there are a large number of scientists who are engaged in this research both at home and abroad.
文摘A necessary condition for realizing macroeconomics is to rationally upgrade the industrial structure.In this process of upgrading,financial capital deepening and technological progress are important ways to promote the upgrading of industrial structure.From an endogenous perspective,this essay explores the internal links between financial capital deepening,technological progress,and industrial structure upgrading.The analysis shows that factors of technological progress have not make a tremendous impact on the upgrading of Chinese industrial structure,nor are they a positive reason for promoting the development of the industry to a higher level.The deepening of financial capital obviously promotes the optimization and upgrading of industrial institutions,which is its main factor.
文摘With the continuous growth of the global population and the acceleration of urbanization,traditional agriculture faces severe challenges,such as labor shortages,low efficiency in agricultural resource utilization,and uncertainties caused by climate change.Unmanned agricultural machinery,as an integral part of smart agriculture,utilizes automation and intelligent technologies to achieve precise control over the entire agricultural production process,improving production efficiency,reducing labor costs,minimizing environmental impacts,and enhancing sustainability.In recent years,with advancements in information technology,artificial intelligence,and the Internet of Things,unmanned agricultural machinery has made significant technological progress and has gradually entered the commercialization stage.This study aims to analyze the technological advancements and development trends of unmanned agricultural machinery and explore its application prospects in practical production.By investigating this emerging technology,the research not only provides a theoretical foundation for agricultural technological innovation but also offers practical references for policymakers,agricultural enterprises,and practitioners.Particularly in the critical period of global agricultural transformation,research on unmanned agricultural machinery holds significant economic,environmental,and social value.
基金funded by the National Nature Science Foundation of China(No.42272350)Hunan Provincial Key R&D Program(2022SK 2070)the Foundation of Shanxi Key Laboratory for Exploration and Exploitation of Geothermal Resources(No.SX202202).
文摘Mid-deep geothermal reinjection technology is crucial for the sustainable development of geothermal resources,which has garnered significant attention and rapid growth in recent years.Currently,various geothermal reinjection technologies lag behind,lacking effective integration to address issues like low reinjection rates and thermal breakthrough.This paper reviews the basic principles and development history of mid-deep geothermal reinjection technology,focusing on various technical methods used in the process and analyzing their applicability,advantages,and disadvantages under different geological conditions.It highlights the unique challenges posed by deep geothermal resources,including high temperature,high pressure,high stress,chemical corrosion,and complex geological structures.Additionally,it addresses challenges in equipment selection and durability,system stability and operation safety,environmental impact,and sustainable development.Finally,the paper explores future directions for mid-deep geothermal reinjection technology,highlighting key areas for further research and potential pathways for technological innovation.This comprehensive analysis aims to accelerate the advancement of geothermal reinjection technology,offering essential guidance for the efficient reinjection and sustainable development of geothermal resources.
文摘The governance of state-owned enterprises(SOEs)has long been central to political and institutional economic debates.Critics often associate SOEs with ine"ciency,rent-seeking and dogma,treating them as relics of command economies.Yet in many developmental states,they have been engines of industrialisation,technological progress and national resilience.China provides perhaps the most striking example.Its SOEs have survived and evolved,some becoming globally competitive multinationals in energy,infrastructure and telecommunications.
文摘SELECTED REMARKS OF CHINESE PRESIDENT XI JINPING On 28 March,Chinese President Xi Jinping met with representatives of the international business community in Beijing.He welcomed them to China,and commended them for their long-standing commitment to cooperation with China.President Xi Jinping noted that foreign businesses and investment in China have driven economic growth and employment,boosted technological and managerial progress,and facilitated reform and opening up.
文摘Economic globalization is a process of forming a global market under the conditions of technological progress and national opening-up.Influenced by factors such as national policies,the international environment and geopolitics,the values,concepts and choices of the participants of globalization will change accordingly,thus affecting the mode,scale and speed of globalization.
文摘Strong provincial capital is an important initiative for underdeveloped regions to realize rapid regional economic development through leading by point,which is related to the overall situation of China's economic high-quality development.This paper theoretically analyzes the internal mechanism of strong provincial capitals affecting regional innovation efficiency.The study finds that the policy of strong provincial capitals promotes the formation of the resource aggregation effect in the capital cities,attracts talents,technologies,policies,and capital and other factors,improves the efficiency and quality of innovation,and drives the development of neighboring regions.However,over-implementation of the policy will lead to a large number of big enterprises,"which will lead to rent-seeking,waste of resources,crowding out of government subsidies and congestion effects,inhibit innovation,and lead to the loss of innovation factors in peripheral cities,dragging down the innovation level of the whole province.Therefore,the relationship between strong provincial capitals and innovation is an inverted"U"shape,and this study is of great significance for understanding the double-edged sword effect of strong provincial capitals and formulating scientific regional innovation policies.
文摘Marx's theory of scientific and technological progress and utilization of natural resources is an indispensable and important part of Marx's economic theory.To realize the harmonious unification of man and nature,man must correctly understand the effect of scientific and technological progress on the use of natural resources,fundamentally solve the problem that scientific and technological progress cannot replace the position of natural resources in economic development,and objectively evaluate the relationship between human power and the power of nature.Grasping and comprehending the scientific connotation of Marx's theory of scientific and technological progress and utilization of natural resources has a very important theoretical value and practical significance for saving and effectively using natural resources and building an environment-friendly society.
文摘Based on the macroanalysis of the unbalanced development of the"demand side"and the"supply side"of clinical medicine in China,this paper elucidates the stakeholders,resources,and ecosystem of the strategic scientific and technological capacity-building and calls for a larger coverage,smoother supply chain,and more sustainable ecosystem to ensure the development of clinical medicine.Furthermore,focusing on the establishment and development of clinical reproductive health in China,the authors introduce the strategic scientific and technological capacity-building of reproductive medicine in Peking University Third Hospital,with an attempt to inform similar efforts in other fields and even the whole clinical medicine in China.
基金Supported by National Natural Science Foundation of China(51991361,52074327,U1762212)Major Engineering Technology Field Tes Project of CNPC(2020F-45)。
文摘By reviewing the mechanisms of drilling fluid lost circulation and its control in fractured formations, the applicability and working mechanisms of different kinds of lost circulation materials in plugging fractured formations have been summarized. Meanwhile, based on the types of lost circulation materials, the advantages, disadvantages, and application effects of corresponding plugging technologies have been analyzed to sort out the key problems existing in the current lost circulation control technologies. On this basis, the development direction of plugging technology for severe loss have been pointed out. It is suggested that that the lost circulation control technology should combine different disciplines such as geology, engineering and materials to realize integration, intelligence and systematization in the future. Five research aspects should be focused on:(1) the study on mechanisms of drilling fluid lost circulation and its control to provide basis for scientific selection of lost circulation material formulas, control methods and processes;(2) the research and development of self-adaptive lost circulation materials to improve the matching relationship between lost control materials and fracture scales;(3) the research and development of lost circulation materials with strong retention and strong filling in three-dimensional fracture space, to enhance the retention and filling capacities of materials in fractures and improve the lost circulation control effect;(4) the research and development of lost circulation materials with high temperature tolerance, to ensure the long-term plugging effect of deep high-temperature formations;(5) the study on digital and intelligent lost circulation control technology, to promote the development of lost circulation control technology to digital and intelligent direction.
文摘Liquid propellant rocket engines for a launch vehicle are an essential aerospace technology, representing the advanced level of hi-tech in a country. In recent years, China’s aerospace industry has made remarkable achievements, and liquid rocket engine technology has also been effectively developed. In this article, the development processes of China’s liquid rocket engines are discussed. Then, the performance features of China’s new generation liquid rocket engines as well as the flight tests of the new-generation launch vehicles are introduced. Finally, the development direction and the most recent progress of the next generation large-thrust liquid rocket engine is presented.
文摘In China, currently there are more than 100 million videos being watched everyday on the Internet. There are three kinds of Internet videos: video sharing, Video on Demand (VoD), and Peer-to-Peer (P2P) streaming media. Video sharing is based on browser/server mode, severing user generated content. VoD is based on client/server mode and needs to be paid for. P2P streaming media is based on P2P mode service for hot content. To address P2P traffic optimization and content regulation, China National Information Technology Standardization Technical Committee sets up P2P working group to make relevant standards.
文摘Welding in aviation industry has become one of the dominate processing technologies for manufacturing flying apparatus.The percentage of welded structures in designs of new flying apparatus has been continuously growing up.Welding technology provides a freedom and guarantee to new structure design and new material application. Technical and economic benefits have been obtaining in application of newly developed welding technologies and achievements in research, such as, SPF/DB,electron beam welding, breezing,low stress nondistortion welding etc.
文摘1 Significance of All Solid State Laser (DPL) Technology in Field of LaserBecause of the advantages of high conversion efficiency, good beam quality, small size and light weight, DPL becomes the hotspot and priority of development of laser technology. It may be the main body of laser in the future and replace gas laser and liquid laser. It is a great revolution of laser technology.The developed countries vie in developing DPL. China has achieved great success in this field, but there is a wide gap between the developed countries and us. We should attach great importance to it.
