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
Theory and technology of network security is the core course of information security major,however,it still faces many challenges in the education of foreign graduate students studying in China.This paper analyzes the...Theory and technology of network security is the core course of information security major,however,it still faces many challenges in the education of foreign graduate students studying in China.This paper analyzes the status quo and existing problems in the course of theory and technology of network security for foreign graduate students studying in China,the most fundamental of which is that the existing teaching materials are difficult to meet the needs of foreign graduate students.In view of the problem,this paper discusses how to improve the existing teaching materials to adapt to the teaching needs for foreign students and puts forward some new ideas and reform measures.展开更多
Turbulent market conditions,well-publicized advantages,and potential individual,social,and environmental risks make blockchain-based cryptocurrencies a popular focus of the public and scientific communities.This paper...Turbulent market conditions,well-publicized advantages,and potential individual,social,and environmental risks make blockchain-based cryptocurrencies a popular focus of the public and scientific communities.This paper contributes to the literature on the future of crypto markets by analyzing a promising cryptocurrency innovation from a customer-centric point of view;it explores the factors influencing user acceptance of a hypothetical social network-backed cryptocurrency in Central Europe.The research model adapts an internationally comparative framework and extends the well-established unified theory of acceptance and use of the technology model with the concept of perceived risk and trust.We explore user attitudes with a survey on a large Hungarian sample and analyze the database with consistent partial least square structural equation modeling methodology.The results show that users would be primarily influenced by the expected usefulness of the new technology assuming it is easy to use.Furthermore,our analysis also highlights that while social influence does not seem to sway user opinions,consumers are susceptible to technological risks,and trust is an important determinant of their openness toward innovations in financial services.We contribute to the cryptocurrency literature with a future-centric technological focus and provide new evidence from an under-researched geographic region.The results also have practical implications for business decision-makers and policymakers.展开更多
Theoretical analyses and experimental studies of the mechanisms of melting film formation are performed. The results show that frictional heating is the dominant mechanism because temperature behaves in the manner pr...Theoretical analyses and experimental studies of the mechanisms of melting film formation are performed. The results show that frictional heating is the dominant mechanism because temperature behaves in the manner predicted by the theory of frictional heating. A study of the active technology for anti-skid is also made. Conclusions indicate that adjusting tire pneumatic pressure can improve the control stability and the travelling safety of an ice-automobile.展开更多
Governments are implementing E-Government systems to match the other services due to the rapid worldwide development. Therefore, public sectors interact with many individuals;utilizing this technology lowers costs, en...Governments are implementing E-Government systems to match the other services due to the rapid worldwide development. Therefore, public sectors interact with many individuals;utilizing this technology lowers costs, enhances services, boosts efficiency, and saves time. The Government of Saudi Arabia has had various obstacles in serving its populace. Poor service delivery and excessive Government operating costs resulted from this manual service delivery. As a result, the Government launched the E-Government systems, which provide services more quickly. As a result, the report covered Saudi Arabia’s efforts to adopt E-Government, its difficulties, and its objectives to advance the 2030 vision. This study examined the adoption of E-Government systems using the Unified Theory of Acceptance and Use of Technology (UTAUT) in Saudi Arabia. A sample size of 200 was estimated using the Convenience approach and received 58% of the response from employees and end-users of the E-Government systems. Data were analyzed using MS-Excel and SMART PLS for testing the hypothesis and applying the Partial Least Square approach. The results of the hypothesis testing reveal several meaningful relationships, including relative benefits, compatibility, security, management support, performance expectations, perceived Usefulness of E-Government, ease of use by reducing uncertainty to E-Government, and IT infrastructure by reducing language on E-Government adoption.展开更多
This paper discusses the methodological specialty of the theoretical investigation in the nanotechnology. In the nanotechnoscience, on the one hand, similar with the classical natural science are created explanatory s...This paper discusses the methodological specialty of the theoretical investigation in the nanotechnology. In the nanotechnoscience, on the one hand, similar with the classical natural science are created explanatory schemes of the natural phenomena and formulated predictions of the course of the definite natural events on the basis of mathematics and experimental data, and on the other, as in the engineering sciences are constructed not only the projects of the new experimental situations but also structural schemes of the new nanosystem unknown in nature and technology. The operation of nanotheory is realized by the iteration method. At first a special engineering problem is formulated. Then it is represented in the form of the structural scheme of the nanosystem which is transformed into the idea about the natural process reflecting its performance. To calculate and mathematically model this process a functional scheme is constructed. Consequently, the engineering problem is reformulated into a scientific one and then into a mathematical problem solved by the deductive method. This path from the bottom to the top represents the analysis of schemes （the bottom up approach）. The way in the opposite direction--the synthesis of schemes （the top down approach）--makes it possible to synthesize the ideal model of a new nanosystem from idealized structural elements, according to the appropriate rules of deductive transformation, to calculate basic parameters of the nanosystem and simulate its function. Nanotechnology is at the same time a field of scientific knowledge and a sphere of engineering activity, in other words--nanotechnoscience--similar with systems engineering as the analysis and design of large-scale, complex, man-machine systems, but now as micro- and nanosystems. Scanning tunneling microscope in the nanoexperiment is not only an arrangement of scientific investigation but also at the same time a facility to fabricate the electrically conducting bridges between an electrode and the selected nanotubes and computer modeling and the design of different artifacts.展开更多
The Zhaotong national shale gas demonstration area in Yunnan(hereinafter referred to as demonstration area)is China's third largest national shale gas production base after ChangningeWeiyuan in Sichuan and Fuling ...The Zhaotong national shale gas demonstration area in Yunnan(hereinafter referred to as demonstration area)is China's third largest national shale gas production base after ChangningeWeiyuan in Sichuan and Fuling in Chongqing.And after more than ten years of deep and careful cultivation,a series of important achievements have been obtained in the exploration and development.From the perspective of exploration and development history,theory and technology,this paper systematically summarizes the exploration discovery process and productivity construction progress of shale gas in the demonstration area,expounds the geological exploration theories and key technologies of mountain shale gas,and predicts their development prospect and direction.And the following research results are obtained.First,the exploration and development in the demonstration area has gone through five development stages,and so far,three major productivity construction zones have been formed,including Huangjinba and Zijinba middleedeep shale gas zones and Taiyang shallow shale gas zone,with cumulative proved geological reserves more than 3100×10^(8) m^(3) and cumulative gas production more than 72×10^(8) m^(3).It has been constructed into the third largest green shale gas demonstration base in China.Second,the“multi-field coordination and multi-element coupling”mountain shale gas enrichment,accumulation and occurrence theory of“sedimentary background controlling source rock and reservoir,reworking intensity controlling preservation,and three-dimensional sealing controlling enrichment”is put forward innovatively,and the“three-dimensional sealing system”accumulation model of extrabasinal shallow shale gas is established.Third,a series of zone selection and evaluation technologies for mountain shale gas in strongly reworked complex structural areas have been developed,and the concept of geologyeengineering integration has first been adopted to create transparent shale gas reservoirs and cultivate high-yield wells.A major exploration breakthrough has been achieved from marginal basin medium deep shale gas layers to extrabasin ultra shallow to medium shallow ones,and domestic first large-scale monoblock shallow shale gas field with reserves over 2570×10^(8) m^(3) has been discovered.Fourth,a landmark technological achievement and efficient development model with geologyeengineering integration and shale geomechanical evaluation as the core has been formed,which leads the clean,green and efficient exploration and development of mountain shale gas.In conclusion,it is necessary to implement the exploration strategic idea of“two outgoing”in the demonstration area,i.e.,“walking out of the stable area of the basin and marching into the complex structure areas in the Dianqianbei Depression”and“walking out of the WufengeLongmaxi Formation and exploring other layers for breakthrough”.What's more,it is recommended to carry out the double-layer stereoscopic horizontal well pattern deployment of“Leping Formation CBM(coal measure gas)þLongmaxi Formation shale gas”appropriately in a large scale,so as to establish a new integrated development model for the three-dimensional efficient development of mountain shale gas and CBM.展开更多
Purpose： This study aims to explore factors affecting continuance intention of mobile reading. Design/methodology/approach： Drawing on the unified theory of acceptance and use of technology （UTAUT）, and integratin...Purpose： This study aims to explore factors affecting continuance intention of mobile reading. Design/methodology/approach： Drawing on the unified theory of acceptance and use of technology （UTAUT）, and integrating perceived enjoyment, we put forward a theoretical research model of factors affecting continuance intention of mobile reading. Using 186 valid data collected through a questionnaire survey, we conducted data analysis with the partial least squares structural equation modeling （PLS-SEM）. Findings： The results show that performance expectancy, effort expectancy, social influence and perceived enjoyment all have positive impacts on continuance intention. Among them, perceived enjoyment has the most significant effect on continuance intention, followed by performance expectancy. In addition, effort expectancy significantly influences perceived enjoyment. Contrary to our expectation, facilitating conditions have no impact on continuance intention. Practical implications： This study could help mobile data service providers to foster users＇ continuous usage of mobile reading. Research limitations： This study focused only on the effect of perceived enjoyment as an internal motivation on continuance intention of mobile reading, and other possible factors were not considered. Also, continuance intention may be different from the actual behavior. Furthermore, data of student users was collected from one university in China, and was cross-sectional, while working samples were not considered. Originality value： This study considers the effects of both external and internal motivation on continuance intention of mobile reading. The results highlight the role of perceived enjoyment in building users＇ continuance intention of mobile reading.展开更多
There exist serious problems in the trustworthiness (security, reliability, controllability and manageability) of the Internet. In order to solve these problems, a new-generation network architecture model, based on t...There exist serious problems in the trustworthiness (security, reliability, controllability and manageability) of the Internet. In order to solve these problems, a new-generation network architecture model, based on the research of the basic theories of new-generation Internet system, is proposed. The solution creates a switching routing model and theory for the new-generation Internet system, and defines the access identifier, generalized switching routing identifier and their mapping principles. It also establishes a pervasive service system architecture and theory, defines the service identifier, connection identifier and their mapping principles. This paper discusses key technologies for the new-generation Internet system, such as access control and management, trusted routing and Quality of Service (QoS), multi-streaming, and network monitoring and management.展开更多
Community-supported agriculture(CSA)has emerged as a viable solution for addressing the agricultural challenges faced by countries like Indonesia.This study uses the wellestablished unified theory of acceptance and us...Community-supported agriculture(CSA)has emerged as a viable solution for addressing the agricultural challenges faced by countries like Indonesia.This study uses the wellestablished unified theory of acceptance and use of technology(UTAUT2)model to examine the interest in CSA of potential customers in Indonesia.A standardized questionnaire was distributed to 1200 respondents,and the data were analyzed using structural equation model-partial least square(SEM-PLS)in SmartPLS 4.0 software.The results capture potential CSA consumer interest and will help to improve CSA development strategies in Indonesia.The model explains 44.4%of customers’intentions,and identifies performance expectancy as the decisive factor in customers’willingness to participate in CSA.Performance expectancy(0.292),hedonic motivation(0.262),social influence(0.259),and facilitating conditions(0.086)positively influence customers’interest in participating in a CSA program.The adoption of CSA programs by both farmers and customers could be increased by implementing regulations that provide tax incentives and subsidies,offering training on sustainable farming practices,facilitating the establishment of distribution channels,and establishing guidelines for fair price and quality standards.This study shows the high potential for the implementation of CSA in Indonesia.It could also be used as a foundation for the development of new policies regarding sustainable agriculture markets in Indonesia.展开更多
Many domestic and international scholars have done a wide range of researches on electromagnetic and technology and have made some achievements. Electromagnetic technology has been used in forest pests control as a c...Many domestic and international scholars have done a wide range of researches on electromagnetic and technology and have made some achievements. Electromagnetic technology has been used in forest pests control as a convenient and high-efficient physics means. This article summaries the current study of the electromagnetic biological effect and introduces the appfication of microwave, pulsed electromagnetic field and electrostatic field to forest pests control. The research direction and prospect of the application of electromagnetic theory and technology to forest pests control arc also discussed.展开更多
E-commerce present opportunities and challenges for businesses, especially for micro-enterprises. This paper proposed a theoretical framework that in line with the unique characteristics of E-commerce acceptance in mi...E-commerce present opportunities and challenges for businesses, especially for micro-enterprises. This paper proposed a theoretical framework that in line with the unique characteristics of E-commerce acceptance in micro-enterprises in Chengdu, which is based on the unified theory of acceptance and use of technology （UTAUT） model. The extending UTAUT model includes key constructs of performance expectation, perceived behavioral control and the characteristics of owner-managers.展开更多
The Systematic Literature Review(SLR)presented in the document focuses on the acceptance of social media(SM)platforms,particularly through the lens of the Unified Theory of Acceptance and Use of Technology(UTAUT),Tech...The Systematic Literature Review(SLR)presented in the document focuses on the acceptance of social media(SM)platforms,particularly through the lens of the Unified Theory of Acceptance and Use of Technology(UTAUT),Technology Acceptance Model(TAM),Theory of Planned Behavior(TPB)and other relevant theories.The review involves a comprehensive analysis of the most used theories of acceptance models,the methods for selecting studies,and the results and findings from the reviewed studies.The study also discusses the accomplishment of research goals and creates a research framework to guide future research.The geographic scope of the studies is also examined,providing insights into the distribution of studies across different countries.The review adheres to the PRISMA(Preferred Reporting Items for Systematic Reviews and meta-Analyses)guidelines for reporting systematic reviews and employs a theory-based approach,categorizing selected articles based on their theoretical foundations.The review’s methodology involves the use of empirical evidence that meets predetermined inclusion criteria and addresses specific research questions.The document provides a detailed account of the steps involved in the systematic review,including the identification,screening,eligibility determination,and selection of studies.The review also offers implications for theory and practice,addresses limitations,and suggests areas for future research.展开更多
General It mainly publishes academic papers,research reports,surveys,research briefings,and degree theses in the field of communications&information systems,signal&information processing,computer software and ...General It mainly publishes academic papers,research reports,surveys,research briefings,and degree theses in the field of communications&information systems,signal&information processing,computer software and computer theory,computer application technology,electromagnetismµwave technology,microelectronics&solid electronics,control theory and control engineering,management science&engineering,and other related basic theories and technologies.展开更多
General It mainly publishes academic papers,research reports,surveys,research briefings,and degree theses in the field of communications&information systems,signal&information processing,computer software and ...General It mainly publishes academic papers,research reports,surveys,research briefings,and degree theses in the field of communications&information systems,signal&information processing,computer software and computer theory,computer application technology,electromagnetismµwave technology,microelectronics&solid electronics,control theory and control engineering,management science&engineering,and other related basic theories and technologies.展开更多
General It mainly publishes academic papers, research reports,surveys, research briefings, and degree theses in the field of communications & information systems, signal & information processing, computer soft...General It mainly publishes academic papers, research reports,surveys, research briefings, and degree theses in the field of communications & information systems, signal & information processing, computer software and computer theory, computer application technology,electromagnetismμwave technology,microelectronics & solid electronics, control theory and control engineering, management science & engineering, and other related basic theories and technologies.展开更多
User acceptance is one of the key fundamentals for development and success of mobile commerce （m-commerce）. Based on the revised unified theory of acceptance and use of technology （UTAUT） model, we described a the...User acceptance is one of the key fundamentals for development and success of mobile commerce （m-commerce）. Based on the revised unified theory of acceptance and use of technology （UTAUT） model, we described a theoretical framework that incorporates the unique characteristics of m-commerce to enhance our understanding of m-commerce acceptance and usage in China. The revised UTAUT includes the characteristics of m-commerce, inclusion and consideration of information system user satisfaction theory, and Chinese culture and context.展开更多
The mobile search, a combination of a web search engine and a mobile communication system, is viewed as the most influential application in the 3G era. Therefore, mobile search service providers are eager to know whic...The mobile search, a combination of a web search engine and a mobile communication system, is viewed as the most influential application in the 3G era. Therefore, mobile search service providers are eager to know which factors most influence user acceptance of mobile searches. Based on the characteristics of mobile searches and a review of previous information technology acceptance research, this study integrates the task technology fit model and the unified theory of acceptance and use of technology model to develop a mobile search acceptance model and empirically tests this model. This study finds that, for mobile searches, the performance expectancy, social influence, and perceived cost all significantly influence use intention and the performance expectancy increases with the increasing user＇s experience and higher tasktechnology fit degree. The effort expectancy is found to not affect the use intention of mobile searches and the users＇ gender does not have a significant moderating effect on the use intention. The results are then used to develop suggestions for mobile search providers to promote their application and development.展开更多
The digital transformation of traditional manufacturing industry is an inevitable trend and inherent development requirement of China’s digital economy.This paper systematically researches the digital transformation ...The digital transformation of traditional manufacturing industry is an inevitable trend and inherent development requirement of China’s digital economy.This paper systematically researches the digital transformation mechanism of traditional manufacturing industry enabled by digital economy from the social,technical,innovative environmental and organizational sub-systems based on the system dynamics(SD)and the social shaping of technology theory(SST).The simulated experiments predicate the different digital transformation paths of the labor-intensive,capital-intensive and technology-intensive traditional manufacturing enterprises under the guidance of Industry 4.0 or"Industry of the future"policy by constructing the system dynamics model of causality,stock flow process,which has vital significance for China’s manufacturing industry to transform from a giant towards a manufacturing power.展开更多
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.
文摘Theory and technology of network security is the core course of information security major,however,it still faces many challenges in the education of foreign graduate students studying in China.This paper analyzes the status quo and existing problems in the course of theory and technology of network security for foreign graduate students studying in China,the most fundamental of which is that the existing teaching materials are difficult to meet the needs of foreign graduate students.In view of the problem,this paper discusses how to improve the existing teaching materials to adapt to the teaching needs for foreign students and puts forward some new ideas and reform measures.
文摘Turbulent market conditions,well-publicized advantages,and potential individual,social,and environmental risks make blockchain-based cryptocurrencies a popular focus of the public and scientific communities.This paper contributes to the literature on the future of crypto markets by analyzing a promising cryptocurrency innovation from a customer-centric point of view;it explores the factors influencing user acceptance of a hypothetical social network-backed cryptocurrency in Central Europe.The research model adapts an internationally comparative framework and extends the well-established unified theory of acceptance and use of the technology model with the concept of perceived risk and trust.We explore user attitudes with a survey on a large Hungarian sample and analyze the database with consistent partial least square structural equation modeling methodology.The results show that users would be primarily influenced by the expected usefulness of the new technology assuming it is easy to use.Furthermore,our analysis also highlights that while social influence does not seem to sway user opinions,consumers are susceptible to technological risks,and trust is an important determinant of their openness toward innovations in financial services.We contribute to the cryptocurrency literature with a future-centric technological focus and provide new evidence from an under-researched geographic region.The results also have practical implications for business decision-makers and policymakers.
基金1This project is supported by National Natural Science Foundation of China ( No.59475033)
文摘Theoretical analyses and experimental studies of the mechanisms of melting film formation are performed. The results show that frictional heating is the dominant mechanism because temperature behaves in the manner predicted by the theory of frictional heating. A study of the active technology for anti-skid is also made. Conclusions indicate that adjusting tire pneumatic pressure can improve the control stability and the travelling safety of an ice-automobile.
文摘Governments are implementing E-Government systems to match the other services due to the rapid worldwide development. Therefore, public sectors interact with many individuals;utilizing this technology lowers costs, enhances services, boosts efficiency, and saves time. The Government of Saudi Arabia has had various obstacles in serving its populace. Poor service delivery and excessive Government operating costs resulted from this manual service delivery. As a result, the Government launched the E-Government systems, which provide services more quickly. As a result, the report covered Saudi Arabia’s efforts to adopt E-Government, its difficulties, and its objectives to advance the 2030 vision. This study examined the adoption of E-Government systems using the Unified Theory of Acceptance and Use of Technology (UTAUT) in Saudi Arabia. A sample size of 200 was estimated using the Convenience approach and received 58% of the response from employees and end-users of the E-Government systems. Data were analyzed using MS-Excel and SMART PLS for testing the hypothesis and applying the Partial Least Square approach. The results of the hypothesis testing reveal several meaningful relationships, including relative benefits, compatibility, security, management support, performance expectations, perceived Usefulness of E-Government, ease of use by reducing uncertainty to E-Government, and IT infrastructure by reducing language on E-Government adoption.
文摘This paper discusses the methodological specialty of the theoretical investigation in the nanotechnology. In the nanotechnoscience, on the one hand, similar with the classical natural science are created explanatory schemes of the natural phenomena and formulated predictions of the course of the definite natural events on the basis of mathematics and experimental data, and on the other, as in the engineering sciences are constructed not only the projects of the new experimental situations but also structural schemes of the new nanosystem unknown in nature and technology. The operation of nanotheory is realized by the iteration method. At first a special engineering problem is formulated. Then it is represented in the form of the structural scheme of the nanosystem which is transformed into the idea about the natural process reflecting its performance. To calculate and mathematically model this process a functional scheme is constructed. Consequently, the engineering problem is reformulated into a scientific one and then into a mathematical problem solved by the deductive method. This path from the bottom to the top represents the analysis of schemes （the bottom up approach）. The way in the opposite direction--the synthesis of schemes （the top down approach）--makes it possible to synthesize the ideal model of a new nanosystem from idealized structural elements, according to the appropriate rules of deductive transformation, to calculate basic parameters of the nanosystem and simulate its function. Nanotechnology is at the same time a field of scientific knowledge and a sphere of engineering activity, in other words--nanotechnoscience--similar with systems engineering as the analysis and design of large-scale, complex, man-machine systems, but now as micro- and nanosystems. Scanning tunneling microscope in the nanoexperiment is not only an arrangement of scientific investigation but also at the same time a facility to fabricate the electrically conducting bridges between an electrode and the selected nanotubes and computer modeling and the design of different artifacts.
基金Project supported by the Scientific Research and Technology Development Project PetroChina Company Limited“Research on microscopic characteristics and enrichment mechanism of shallow shale gas reservoirs in Zhaotong”(No.2021DJ1903)“Field test of downhole fiber intelligent monitoring technology”(No.2020F-44).
文摘The Zhaotong national shale gas demonstration area in Yunnan(hereinafter referred to as demonstration area)is China's third largest national shale gas production base after ChangningeWeiyuan in Sichuan and Fuling in Chongqing.And after more than ten years of deep and careful cultivation,a series of important achievements have been obtained in the exploration and development.From the perspective of exploration and development history,theory and technology,this paper systematically summarizes the exploration discovery process and productivity construction progress of shale gas in the demonstration area,expounds the geological exploration theories and key technologies of mountain shale gas,and predicts their development prospect and direction.And the following research results are obtained.First,the exploration and development in the demonstration area has gone through five development stages,and so far,three major productivity construction zones have been formed,including Huangjinba and Zijinba middleedeep shale gas zones and Taiyang shallow shale gas zone,with cumulative proved geological reserves more than 3100×10^(8) m^(3) and cumulative gas production more than 72×10^(8) m^(3).It has been constructed into the third largest green shale gas demonstration base in China.Second,the“multi-field coordination and multi-element coupling”mountain shale gas enrichment,accumulation and occurrence theory of“sedimentary background controlling source rock and reservoir,reworking intensity controlling preservation,and three-dimensional sealing controlling enrichment”is put forward innovatively,and the“three-dimensional sealing system”accumulation model of extrabasinal shallow shale gas is established.Third,a series of zone selection and evaluation technologies for mountain shale gas in strongly reworked complex structural areas have been developed,and the concept of geologyeengineering integration has first been adopted to create transparent shale gas reservoirs and cultivate high-yield wells.A major exploration breakthrough has been achieved from marginal basin medium deep shale gas layers to extrabasin ultra shallow to medium shallow ones,and domestic first large-scale monoblock shallow shale gas field with reserves over 2570×10^(8) m^(3) has been discovered.Fourth,a landmark technological achievement and efficient development model with geologyeengineering integration and shale geomechanical evaluation as the core has been formed,which leads the clean,green and efficient exploration and development of mountain shale gas.In conclusion,it is necessary to implement the exploration strategic idea of“two outgoing”in the demonstration area,i.e.,“walking out of the stable area of the basin and marching into the complex structure areas in the Dianqianbei Depression”and“walking out of the WufengeLongmaxi Formation and exploring other layers for breakthrough”.What's more,it is recommended to carry out the double-layer stereoscopic horizontal well pattern deployment of“Leping Formation CBM(coal measure gas)þLongmaxi Formation shale gas”appropriately in a large scale,so as to establish a new integrated development model for the three-dimensional efficient development of mountain shale gas and CBM.
基金supported by the National Natural Science Foundation of China(Grant No.:71403301)
文摘Purpose： This study aims to explore factors affecting continuance intention of mobile reading. Design/methodology/approach： Drawing on the unified theory of acceptance and use of technology （UTAUT）, and integrating perceived enjoyment, we put forward a theoretical research model of factors affecting continuance intention of mobile reading. Using 186 valid data collected through a questionnaire survey, we conducted data analysis with the partial least squares structural equation modeling （PLS-SEM）. Findings： The results show that performance expectancy, effort expectancy, social influence and perceived enjoyment all have positive impacts on continuance intention. Among them, perceived enjoyment has the most significant effect on continuance intention, followed by performance expectancy. In addition, effort expectancy significantly influences perceived enjoyment. Contrary to our expectation, facilitating conditions have no impact on continuance intention. Practical implications： This study could help mobile data service providers to foster users＇ continuous usage of mobile reading. Research limitations： This study focused only on the effect of perceived enjoyment as an internal motivation on continuance intention of mobile reading, and other possible factors were not considered. Also, continuance intention may be different from the actual behavior. Furthermore, data of student users was collected from one university in China, and was cross-sectional, while working samples were not considered. Originality value： This study considers the effects of both external and internal motivation on continuance intention of mobile reading. The results highlight the role of perceived enjoyment in building users＇ continuance intention of mobile reading.
基金the National BasicResearch Program of China ("973" Program)under Grant 2007CB307101the CultivationFinances of Ministry of Education for HigherEducation Institutes’Major Programs in Scienceand Technology Innovation Engineering underGrant 706005the Discipline Innovation andTalent Introduction Plan for Higher EducationInstitutes of China under Grant B08002.
文摘There exist serious problems in the trustworthiness (security, reliability, controllability and manageability) of the Internet. In order to solve these problems, a new-generation network architecture model, based on the research of the basic theories of new-generation Internet system, is proposed. The solution creates a switching routing model and theory for the new-generation Internet system, and defines the access identifier, generalized switching routing identifier and their mapping principles. It also establishes a pervasive service system architecture and theory, defines the service identifier, connection identifier and their mapping principles. This paper discusses key technologies for the new-generation Internet system, such as access control and management, trusted routing and Quality of Service (QoS), multi-streaming, and network monitoring and management.
文摘Community-supported agriculture(CSA)has emerged as a viable solution for addressing the agricultural challenges faced by countries like Indonesia.This study uses the wellestablished unified theory of acceptance and use of technology(UTAUT2)model to examine the interest in CSA of potential customers in Indonesia.A standardized questionnaire was distributed to 1200 respondents,and the data were analyzed using structural equation model-partial least square(SEM-PLS)in SmartPLS 4.0 software.The results capture potential CSA consumer interest and will help to improve CSA development strategies in Indonesia.The model explains 44.4%of customers’intentions,and identifies performance expectancy as the decisive factor in customers’willingness to participate in CSA.Performance expectancy(0.292),hedonic motivation(0.262),social influence(0.259),and facilitating conditions(0.086)positively influence customers’interest in participating in a CSA program.The adoption of CSA programs by both farmers and customers could be increased by implementing regulations that provide tax incentives and subsidies,offering training on sustainable farming practices,facilitating the establishment of distribution channels,and establishing guidelines for fair price and quality standards.This study shows the high potential for the implementation of CSA in Indonesia.It could also be used as a foundation for the development of new policies regarding sustainable agriculture markets in Indonesia.
基金Supported by the National Nature Science Foundation of China (grant No. 30471384 )
文摘Many domestic and international scholars have done a wide range of researches on electromagnetic and technology and have made some achievements. Electromagnetic technology has been used in forest pests control as a convenient and high-efficient physics means. This article summaries the current study of the electromagnetic biological effect and introduces the appfication of microwave, pulsed electromagnetic field and electrostatic field to forest pests control. The research direction and prospect of the application of electromagnetic theory and technology to forest pests control arc also discussed.
文摘E-commerce present opportunities and challenges for businesses, especially for micro-enterprises. This paper proposed a theoretical framework that in line with the unique characteristics of E-commerce acceptance in micro-enterprises in Chengdu, which is based on the unified theory of acceptance and use of technology （UTAUT） model. The extending UTAUT model includes key constructs of performance expectation, perceived behavioral control and the characteristics of owner-managers.
文摘The Systematic Literature Review(SLR)presented in the document focuses on the acceptance of social media(SM)platforms,particularly through the lens of the Unified Theory of Acceptance and Use of Technology(UTAUT),Technology Acceptance Model(TAM),Theory of Planned Behavior(TPB)and other relevant theories.The review involves a comprehensive analysis of the most used theories of acceptance models,the methods for selecting studies,and the results and findings from the reviewed studies.The study also discusses the accomplishment of research goals and creates a research framework to guide future research.The geographic scope of the studies is also examined,providing insights into the distribution of studies across different countries.The review adheres to the PRISMA(Preferred Reporting Items for Systematic Reviews and meta-Analyses)guidelines for reporting systematic reviews and employs a theory-based approach,categorizing selected articles based on their theoretical foundations.The review’s methodology involves the use of empirical evidence that meets predetermined inclusion criteria and addresses specific research questions.The document provides a detailed account of the steps involved in the systematic review,including the identification,screening,eligibility determination,and selection of studies.The review also offers implications for theory and practice,addresses limitations,and suggests areas for future research.
文摘General It mainly publishes academic papers,research reports,surveys,research briefings,and degree theses in the field of communications&information systems,signal&information processing,computer software and computer theory,computer application technology,electromagnetismµwave technology,microelectronics&solid electronics,control theory and control engineering,management science&engineering,and other related basic theories and technologies.
文摘General It mainly publishes academic papers,research reports,surveys,research briefings,and degree theses in the field of communications&information systems,signal&information processing,computer software and computer theory,computer application technology,electromagnetismµwave technology,microelectronics&solid electronics,control theory and control engineering,management science&engineering,and other related basic theories and technologies.
文摘General It mainly publishes academic papers, research reports,surveys, research briefings, and degree theses in the field of communications & information systems, signal & information processing, computer software and computer theory, computer application technology,electromagnetismμwave technology,microelectronics & solid electronics, control theory and control engineering, management science & engineering, and other related basic theories and technologies.
基金the National Natural Science Foundation of China (No. 70602032)
文摘User acceptance is one of the key fundamentals for development and success of mobile commerce （m-commerce）. Based on the revised unified theory of acceptance and use of technology （UTAUT） model, we described a theoretical framework that incorporates the unique characteristics of m-commerce to enhance our understanding of m-commerce acceptance and usage in China. The revised UTAUT includes the characteristics of m-commerce, inclusion and consideration of information system user satisfaction theory, and Chinese culture and context.
基金Supported by the National Natural Science Foundation of China(Nos. 70831003, 70890081, and 70772022the MOE Project of Key Research Institute of Humanity and Social Sciences at Universities (06JJD630014)
文摘The mobile search, a combination of a web search engine and a mobile communication system, is viewed as the most influential application in the 3G era. Therefore, mobile search service providers are eager to know which factors most influence user acceptance of mobile searches. Based on the characteristics of mobile searches and a review of previous information technology acceptance research, this study integrates the task technology fit model and the unified theory of acceptance and use of technology model to develop a mobile search acceptance model and empirically tests this model. This study finds that, for mobile searches, the performance expectancy, social influence, and perceived cost all significantly influence use intention and the performance expectancy increases with the increasing user＇s experience and higher tasktechnology fit degree. The effort expectancy is found to not affect the use intention of mobile searches and the users＇ gender does not have a significant moderating effect on the use intention. The results are then used to develop suggestions for mobile search providers to promote their application and development.
基金the major research achievements of NSSF project"Research on deep fusion mechanism,spillover effect and realization path of digital economy and traditional manufacturing industry"supported by the National Social Science Foundation of China(Grant No.20BJY092)
文摘The digital transformation of traditional manufacturing industry is an inevitable trend and inherent development requirement of China’s digital economy.This paper systematically researches the digital transformation mechanism of traditional manufacturing industry enabled by digital economy from the social,technical,innovative environmental and organizational sub-systems based on the system dynamics(SD)and the social shaping of technology theory(SST).The simulated experiments predicate the different digital transformation paths of the labor-intensive,capital-intensive and technology-intensive traditional manufacturing enterprises under the guidance of Industry 4.0 or"Industry of the future"policy by constructing the system dynamics model of causality,stock flow process,which has vital significance for China’s manufacturing industry to transform from a giant towards a manufacturing power.
