This study focuses on a new technology of Subsurface Tension Leg Platform （STLP）, which utilizes the shallow- water rated well completion equipment and technology for the development of large oil and gas fields in u...This study focuses on a new technology of Subsurface Tension Leg Platform （STLP）, which utilizes the shallow- water rated well completion equipment and technology for the development of large oil and gas fields in ultra-deep water （UDW）. Thus, the STLP concept offers attractive advantages over conventional field development concepts. STLP is basically a pre-installed Subsurface Sea-star Platform （SSP）, which supports rigid risers and shallow-water rated well completion equipment. The paper details the results of the parametric study on the behavior of STLP at a water depth of 3000 m. At first, a general description of the STLP configuration and working principle is introduced. Then, the numerical models for the global analysis of the STLP in waves and current are presented. After that, extensive parametric studies are carried out with regarding to SSP/tethers system analysis, global dynamic analysis and riser interference analysis. Critical points are addressed on the mooring pattern and riser arrangement under the influence of ocean current, to ensure that the requirements on SSP stability and riser interference are well satisfied. Finally, conclusions and discussions are made. The results indicate that STLP is a competitive well and riser solution in up to 3000 m water depth for offshore petroleum production.展开更多
To take advantage of the abundance of both fishery and wave energy resources in offshore sea areas,a novel floating platform with a heaving buoy-based wave energy converter(WEC)assembled with a set of net cages is pre...To take advantage of the abundance of both fishery and wave energy resources in offshore sea areas,a novel floating platform with a heaving buoy-based wave energy converter(WEC)assembled with a set of net cages is presented in this work.The floating WEC system provides a power supply,while the net cages are used for aquaculture.It is designed to have an independent and self-operation breeding function.An experimental study is carried out to investigate the hydrodynamic performance of the device in a wave tank considering the factors of net cages,draft depth,and power take-off,and results show that these variables have significant effects on wave energy capture.Incident waves with short periods cause intense interactions that allow the device to undergo large relative motion.The draft depth could be determined according to wave period rather than wave height.This study also explores the response amplitude operator of the device and determines its resonance scope.The experimental results could provide reliable information for future studies on phase differences and the design of two-body WECs.展开更多
Cancer stem cells(CSCs)are a relatively rare subpopulation of tumor cell with self-renewal and tumorigenesis capabilities.CSCs are associated with cancer recurrence,progression,and chemoradiotherapy resistance.Establi...Cancer stem cells(CSCs)are a relatively rare subpopulation of tumor cell with self-renewal and tumorigenesis capabilities.CSCs are associated with cancer recurrence,progression,and chemoradiotherapy resistance.Establishing a reliable platform for CSC enrichment and study is a prerequisite for understanding the characteristics of CSCs and discovering CSC-related therapeutic strategies.Certain strategies for CSC enrichment have been used in laboratory,particularly fluorescence-activated cell sorting(FACS)and mammosphere culture.However,these methods fail to recapitulate the in vivo chemical and physical conditions in tumors,thus potentially decreasing the malignancy of CSCs in culture and yielding unreliable research results.Accumulating research suggests the promise of a biomaterial-based three-dimensional(3 D)strategy for CSC enrichment and study.This strategy has an advantage over conventional methods in simulating the tumor microenvironment,thus providing a more effective and predictive model for CSC laboratory research.In this review,we first briefly discuss the conventional methods for CSC enrichment and study.We then summarize the latest advances and challenges in biomaterial-based 3 D CSC platforms.Design strategies for materials,morphology,and chemical and physical cues are highlighted to provide direction for the future construction of platforms for CSC enrichment and study.展开更多
On the basis of Miner's linear cumulative damage theorem, random variables are introduced to evaluate objectively the fatigue damage of a semi-submerged platform structure and a method is presented to analyze the ...On the basis of Miner's linear cumulative damage theorem, random variables are introduced to evaluate objectively the fatigue damage of a semi-submerged platform structure and a method is presented to analyze the fatigue reliability of the structure in its design life. The reliability of the method is verified through numerical examples and some conclusions are drawn, which have certain guiding and reference value for design and inspection.展开更多
Integrating various data sets to provide one optimal subsurface image is a major goal of geophysicst. In this paper, there is a synergetic approach used to delineate the tectonic-structural framework with analyzing th...Integrating various data sets to provide one optimal subsurface image is a major goal of geophysicst. In this paper, there is a synergetic approach used to delineate the tectonic-structural framework with analyzing the hydrocarbon reservoir in the Lower Indus Platform basin of Pakistan. The reflected seismic profiles and potential field map constitute the data base of this study. Our study in the line of the previous research is resulted from important oil and gas discoveries contained in the Early Cretaceous and Upper Jurassic formations of the Lower Indus Platform basin area. The result shows trapping mechanism in the Lower Indus Platform basin involves of the fault blocks and stratigraphic traps are present in the area. The more refined images are interpreted to provide greater insight into detailed integrated geophysical study of area.展开更多
This article discusses the security of the NGN service platform in terms of the open service interface and service deployment.It thinks that security of the open service interface can be solved by adding the service a...This article discusses the security of the NGN service platform in terms of the open service interface and service deployment.It thinks that security of the open service interface can be solved by adding the service access gateway and service management platform.The service access gateway provides security features to the open service interface concerning ID authentication,authorization,audit,encryption and integrity protection.For service deployment,its security can be solved by issuing related user digital certificates,deploying a firewall or an intrusion detection system,implementing load control,managing users'home location and displaying users'real-time IP addresses.展开更多
Taking“Friendly Shandong”official account as an example,the relevant data of the account on the four platforms of Tiktok,Kwai,Bilibili and Little Red Book were comparatively analyzed to study the influence of short ...Taking“Friendly Shandong”official account as an example,the relevant data of the account on the four platforms of Tiktok,Kwai,Bilibili and Little Red Book were comparatively analyzed to study the influence of short video on the communication of Shandong tourism image.The research mainly included two aspects:fan persona features and interactive effects.Through comparative study,it will provide a reference for the operation team of“Friendly Shandong”official account to spread the tourism image of Shandong with different platforms.展开更多
In the course of Japanese talent cultivation in GUT,there has carried out multivariate collaborative education platform construction of“Joint Training Platform with Japanese Universities”,“Internship Platform for J...In the course of Japanese talent cultivation in GUT,there has carried out multivariate collaborative education platform construction of“Joint Training Platform with Japanese Universities”,“Internship Platform for Japanese Enterprises”and“Cross-border E-commerce Talent Cultivation for Colleges-Enterprise Platform”.The study finds that it has played a great role in promoting students’learning motivation,students’Japanese practical application ability,students’employment competitive capacity,enrollment scale expansion and enrollment level promotion,and also played a more obvious role in the improvement of Japanese talent cultivation.展开更多
The development of information technology, especially the rise of online teaching platforms, has changed the way people read and the methods they use. Under this influence, primary school students’ independent readin...The development of information technology, especially the rise of online teaching platforms, has changed the way people read and the methods they use. Under this influence, primary school students’ independent reading has also been changed. However, due to limited self-control and understanding, primary school students face certain difficulties when using online teaching platforms for independent reading. Advantages and disadvantages of distance learning based on the network teaching platform were summarized in this paper. A one-year experiment study was carried out on our school fifth-grade students in independent reading using WeChat campus platform considering their current situation and existing problems of independent reading. In experiment study an independent reading mode was introduced. The results show that this reading mode can significantly improve students’ independent reading ability.展开更多
Background Over the last few years,the rapid advancement of technology has led to the development of many approaches to digitalization.In this respect,metaverse provides 3D persistent virtual environments that can be ...Background Over the last few years,the rapid advancement of technology has led to the development of many approaches to digitalization.In this respect,metaverse provides 3D persistent virtual environments that can be used to access digital content,meet virtually,and perform several professional and leisure tasks.Among the numerous technologies supporting the metaverse,immersive Virtual Reality(VR)plays a primary role and offers highly interactive social experiences.Despite growing interest in this area,there are no clear design guidelines for creating environments tailored to the metaverse.Methods This study seeks to advance research in this area by moving from state-of-the-art studies on the design of immersive virtual environments in the context of metaverse and proposing how to integrate cutting-edge technologies within this context.Specifically,the best practices were identified by i)analyzing literature studies focused on human behavior in immersive virtual environments,ii)extracting common features of existing social VR platforms,and iii)conducting interviews with experts in a specific application domain.Specifically,this study considered the creation of a new virtual environment for MetaLibrary,a VR-based social platform aimed at integrating public libraries into metaverse.Several implementation challenges and additional requirements have been identified for the development of virtual environments(VEs).These elements were considered in the selection of specific cutting-edge technologies and their integration into the development process.A user study was also conducted to investigate some design aspects(namely lighting conditions and richness of the scene layout)for which deriving clear indications from the above analysis was not possible because different alternative configurations could be chosen.Results The work reported in this paper seeks to bridge the gap between existing VR platforms and related literature in the field,on the one hand,and requirements regarding immersive virtual environments for the metaverse,on the other hand,by reporting a set of best practices which were used to build a social virtual environment that meets users'expectations and needs.Conclusions Results suggest that carefully designed virtual environments can positively affect user experience and interaction within metaverse.The insights gained from this study offer valuable cues for developing immersive virtual environments for the metaverse to deliver more effective and engaging experiences.展开更多
A template offshore platform, located in the Bohai Bay of China, has exhibited excessive, unexpected vibration under mildly hostile sea conditions, which has affected the normal operation of the platform. Since the st...A template offshore platform, located in the Bohai Bay of China, has exhibited excessive, unexpected vibration under mildly hostile sea conditions, which has affected the normal operation of the platform. Since the structure was designed to sustain more severe wave climate, the cause of the excessive vibration has been suspected to originate from other sources. The main objectives of this study are to investigate the causes of the excessive vibration, and to explore possible remedies to solve the problem. In this paper, the vibration behavior of the offshore platform is analyzed by means of finite element (FE) modeling, field measurements and laboratory test. Results of analysis suggest that relative movement and impact between the piles and the jacket legs exist, i.e. the piles and the jacket are not perfectly connected. The disconnection of the piles and jacket weakens the overall stiffness of the platform, and therefore produces unexpected excessive vibration. In this study, measures for reducing the excessive vibration are proposed to control the response of the platform.展开更多
Loal flexibility of tubular joints has important effect on the static and dynamic behaviour of offshore platforms, therefore, the determination of it becomes an important research subject in the field of offshore engi...Loal flexibility of tubular joints has important effect on the static and dynamic behaviour of offshore platforms, therefore, the determination of it becomes an important research subject in the field of offshore engineering. In this paper, the local flexibility of TY-type tubular joints, which are widely used in offshore platforms, is calculated by using semi- analytical method. Based on the calculated results, parametric formulae for evaluating element in the local joint flexibility matrix of TY- type tubular joints are derived by regression. A test on PVC models of TY-type tubular joints to measure the local joint flexibility is also reported. A comparison of the results calculated from the parametric formulae presented in this paper with those measured from the model test shows that the parametric formulae are reliable. It is recommended that these formulae be used in the global structural analysis of offshore platforms.展开更多
In the era of the Internet,various network platforms have evolved into new hubs for information dissemination.Currently,China has established a platform-centered content regulation framework,wherein platforms proactiv...In the era of the Internet,various network platforms have evolved into new hubs for information dissemination.Currently,China has established a platform-centered content regulation framework,wherein platforms proactively enforce content regulations in accordance with legal censorship obligations.Additionally,platform policies and user agreements augment their authority in content regulation.The platforms can achieve cost-effective and highly efficient content regulation by leveraging their strategic advantages enabled by their own technical capabilities and extensive coverage.The platform self-regulation model,however,still faces challenges.First,accurately evaluating content remains a formidable task;second,ensuring effective platform publicity through self-regulation poses difficulties;third,users may potentially face disadvantages due to the platform’s right of self-regulation;and fourth,digital copyright owners face challenges when defending digital copyright disputes under the safe harbor rule.Therefore,it is imperative to establish,review,and revise the legal framework for content regulation of network platforms in order to enhance the efficiency of their governance systems.The formulation of the legal framework for content regulation of network platforms may encompass the following aspects:rationalizing obligations pertaining to platform content regulations,enhancing supervision over platform self-regulation,and establishing a dual-track responsibility system for digital copyright content regulation.This will ensure a harmonious balance among public interests,users’personal rights and interests,and commercial benefits through regulating the content on network platforms.展开更多
基金financially supported by the National Natural Science Foundation of China(Grant No.51709041)
文摘This study focuses on a new technology of Subsurface Tension Leg Platform （STLP）, which utilizes the shallow- water rated well completion equipment and technology for the development of large oil and gas fields in ultra-deep water （UDW）. Thus, the STLP concept offers attractive advantages over conventional field development concepts. STLP is basically a pre-installed Subsurface Sea-star Platform （SSP）, which supports rigid risers and shallow-water rated well completion equipment. The paper details the results of the parametric study on the behavior of STLP at a water depth of 3000 m. At first, a general description of the STLP configuration and working principle is introduced. Then, the numerical models for the global analysis of the STLP in waves and current are presented. After that, extensive parametric studies are carried out with regarding to SSP/tethers system analysis, global dynamic analysis and riser interference analysis. Critical points are addressed on the mooring pattern and riser arrangement under the influence of ocean current, to ensure that the requirements on SSP stability and riser interference are well satisfied. Finally, conclusions and discussions are made. The results indicate that STLP is a competitive well and riser solution in up to 3000 m water depth for offshore petroleum production.
基金financially supported by the Special Project for Marine Renewable Energy (No. GHME2016YY02)the National Key R&D Program of China (No. 2018YFB 1501900)+1 种基金the Shandong Provincial Natural Science Key Basic Program (No. ZR2017ZA0202)the Qingdao Municipal Science & Technology Program (No. 15-8-3-7jch)
文摘To take advantage of the abundance of both fishery and wave energy resources in offshore sea areas,a novel floating platform with a heaving buoy-based wave energy converter(WEC)assembled with a set of net cages is presented in this work.The floating WEC system provides a power supply,while the net cages are used for aquaculture.It is designed to have an independent and self-operation breeding function.An experimental study is carried out to investigate the hydrodynamic performance of the device in a wave tank considering the factors of net cages,draft depth,and power take-off,and results show that these variables have significant effects on wave energy capture.Incident waves with short periods cause intense interactions that allow the device to undergo large relative motion.The draft depth could be determined according to wave period rather than wave height.This study also explores the response amplitude operator of the device and determines its resonance scope.The experimental results could provide reliable information for future studies on phase differences and the design of two-body WECs.
基金supported by grants from the National Natural Science Foundation of China(Grant Nos.11832008 and 81703012)the Program of the Postgraduate Tutor Team of Chongqing Education Commission(2018)+1 种基金the Fundamental Research Funds for the Central Universities(Grant No.2019CDXYSG0004)the Visiting Scholar Foundation of the Key Laboratory of Biorheological Science and Technology(Chongqing University),Ministry of Education(Grant No.CQKLBST-2017-005)。
文摘Cancer stem cells(CSCs)are a relatively rare subpopulation of tumor cell with self-renewal and tumorigenesis capabilities.CSCs are associated with cancer recurrence,progression,and chemoradiotherapy resistance.Establishing a reliable platform for CSC enrichment and study is a prerequisite for understanding the characteristics of CSCs and discovering CSC-related therapeutic strategies.Certain strategies for CSC enrichment have been used in laboratory,particularly fluorescence-activated cell sorting(FACS)and mammosphere culture.However,these methods fail to recapitulate the in vivo chemical and physical conditions in tumors,thus potentially decreasing the malignancy of CSCs in culture and yielding unreliable research results.Accumulating research suggests the promise of a biomaterial-based three-dimensional(3 D)strategy for CSC enrichment and study.This strategy has an advantage over conventional methods in simulating the tumor microenvironment,thus providing a more effective and predictive model for CSC laboratory research.In this review,we first briefly discuss the conventional methods for CSC enrichment and study.We then summarize the latest advances and challenges in biomaterial-based 3 D CSC platforms.Design strategies for materials,morphology,and chemical and physical cues are highlighted to provide direction for the future construction of platforms for CSC enrichment and study.
基金A part of the project supported financially by the National Natural Science Foundation of China
文摘On the basis of Miner's linear cumulative damage theorem, random variables are introduced to evaluate objectively the fatigue damage of a semi-submerged platform structure and a method is presented to analyze the fatigue reliability of the structure in its design life. The reliability of the method is verified through numerical examples and some conclusions are drawn, which have certain guiding and reference value for design and inspection.
文摘Integrating various data sets to provide one optimal subsurface image is a major goal of geophysicst. In this paper, there is a synergetic approach used to delineate the tectonic-structural framework with analyzing the hydrocarbon reservoir in the Lower Indus Platform basin of Pakistan. The reflected seismic profiles and potential field map constitute the data base of this study. Our study in the line of the previous research is resulted from important oil and gas discoveries contained in the Early Cretaceous and Upper Jurassic formations of the Lower Indus Platform basin area. The result shows trapping mechanism in the Lower Indus Platform basin involves of the fault blocks and stratigraphic traps are present in the area. The more refined images are interpreted to provide greater insight into detailed integrated geophysical study of area.
文摘This article discusses the security of the NGN service platform in terms of the open service interface and service deployment.It thinks that security of the open service interface can be solved by adding the service access gateway and service management platform.The service access gateway provides security features to the open service interface concerning ID authentication,authorization,audit,encryption and integrity protection.For service deployment,its security can be solved by issuing related user digital certificates,deploying a firewall or an intrusion detection system,implementing load control,managing users'home location and displaying users'real-time IP addresses.
基金Social Science Planning Research Project of Shandong Province(22CLYJ34)Key Project of Shandong Art Science(23QR03280040)+1 种基金Social Science Project of Tai’an City(23YB061)First-class Undergraduate Courses of Tourism Markeing of Taishan University.
文摘Taking“Friendly Shandong”official account as an example,the relevant data of the account on the four platforms of Tiktok,Kwai,Bilibili and Little Red Book were comparatively analyzed to study the influence of short video on the communication of Shandong tourism image.The research mainly included two aspects:fan persona features and interactive effects.Through comparative study,it will provide a reference for the operation team of“Friendly Shandong”official account to spread the tourism image of Shandong with different platforms.
基金2017 Guangxi Higher Education Undergraduate Teaching Reform Project in China(2017JGB251)。
文摘In the course of Japanese talent cultivation in GUT,there has carried out multivariate collaborative education platform construction of“Joint Training Platform with Japanese Universities”,“Internship Platform for Japanese Enterprises”and“Cross-border E-commerce Talent Cultivation for Colleges-Enterprise Platform”.The study finds that it has played a great role in promoting students’learning motivation,students’Japanese practical application ability,students’employment competitive capacity,enrollment scale expansion and enrollment level promotion,and also played a more obvious role in the improvement of Japanese talent cultivation.
文摘The development of information technology, especially the rise of online teaching platforms, has changed the way people read and the methods they use. Under this influence, primary school students’ independent reading has also been changed. However, due to limited self-control and understanding, primary school students face certain difficulties when using online teaching platforms for independent reading. Advantages and disadvantages of distance learning based on the network teaching platform were summarized in this paper. A one-year experiment study was carried out on our school fifth-grade students in independent reading using WeChat campus platform considering their current situation and existing problems of independent reading. In experiment study an independent reading mode was introduced. The results show that this reading mode can significantly improve students’ independent reading ability.
基金Supported by Fondazione TIM in the context of the “Facciamola Facile” initiativeby Programma Operativo Nazionale (PON)“Ricerca e Innovazione” 2014-2020-DM 1062/2021 funds
文摘Background Over the last few years,the rapid advancement of technology has led to the development of many approaches to digitalization.In this respect,metaverse provides 3D persistent virtual environments that can be used to access digital content,meet virtually,and perform several professional and leisure tasks.Among the numerous technologies supporting the metaverse,immersive Virtual Reality(VR)plays a primary role and offers highly interactive social experiences.Despite growing interest in this area,there are no clear design guidelines for creating environments tailored to the metaverse.Methods This study seeks to advance research in this area by moving from state-of-the-art studies on the design of immersive virtual environments in the context of metaverse and proposing how to integrate cutting-edge technologies within this context.Specifically,the best practices were identified by i)analyzing literature studies focused on human behavior in immersive virtual environments,ii)extracting common features of existing social VR platforms,and iii)conducting interviews with experts in a specific application domain.Specifically,this study considered the creation of a new virtual environment for MetaLibrary,a VR-based social platform aimed at integrating public libraries into metaverse.Several implementation challenges and additional requirements have been identified for the development of virtual environments(VEs).These elements were considered in the selection of specific cutting-edge technologies and their integration into the development process.A user study was also conducted to investigate some design aspects(namely lighting conditions and richness of the scene layout)for which deriving clear indications from the above analysis was not possible because different alternative configurations could be chosen.Results The work reported in this paper seeks to bridge the gap between existing VR platforms and related literature in the field,on the one hand,and requirements regarding immersive virtual environments for the metaverse,on the other hand,by reporting a set of best practices which were used to build a social virtual environment that meets users'expectations and needs.Conclusions Results suggest that carefully designed virtual environments can positively affect user experience and interaction within metaverse.The insights gained from this study offer valuable cues for developing immersive virtual environments for the metaverse to deliver more effective and engaging experiences.
基金This work was financially supported by the National Natural Science Foundation of China(Grant No.50179014)
文摘A template offshore platform, located in the Bohai Bay of China, has exhibited excessive, unexpected vibration under mildly hostile sea conditions, which has affected the normal operation of the platform. Since the structure was designed to sustain more severe wave climate, the cause of the excessive vibration has been suspected to originate from other sources. The main objectives of this study are to investigate the causes of the excessive vibration, and to explore possible remedies to solve the problem. In this paper, the vibration behavior of the offshore platform is analyzed by means of finite element (FE) modeling, field measurements and laboratory test. Results of analysis suggest that relative movement and impact between the piles and the jacket legs exist, i.e. the piles and the jacket are not perfectly connected. The disconnection of the piles and jacket weakens the overall stiffness of the platform, and therefore produces unexpected excessive vibration. In this study, measures for reducing the excessive vibration are proposed to control the response of the platform.
文摘Loal flexibility of tubular joints has important effect on the static and dynamic behaviour of offshore platforms, therefore, the determination of it becomes an important research subject in the field of offshore engineering. In this paper, the local flexibility of TY-type tubular joints, which are widely used in offshore platforms, is calculated by using semi- analytical method. Based on the calculated results, parametric formulae for evaluating element in the local joint flexibility matrix of TY- type tubular joints are derived by regression. A test on PVC models of TY-type tubular joints to measure the local joint flexibility is also reported. A comparison of the results calculated from the parametric formulae presented in this paper with those measured from the model test shows that the parametric formulae are reliable. It is recommended that these formulae be used in the global structural analysis of offshore platforms.
基金This paper is a phased achievement of the key project of the Chongqing Municipal Education Commission entitled“Research on Establishment of Regional Legal Framework for Rural Revitalization”(Project No.23SKJD033)the university-level project of Southwest University of Political Science&Law entitled“A Comparative Study on Legislation for Agricultural and Rural Modernization”(Project No.DFLF2020Y12).
文摘In the era of the Internet,various network platforms have evolved into new hubs for information dissemination.Currently,China has established a platform-centered content regulation framework,wherein platforms proactively enforce content regulations in accordance with legal censorship obligations.Additionally,platform policies and user agreements augment their authority in content regulation.The platforms can achieve cost-effective and highly efficient content regulation by leveraging their strategic advantages enabled by their own technical capabilities and extensive coverage.The platform self-regulation model,however,still faces challenges.First,accurately evaluating content remains a formidable task;second,ensuring effective platform publicity through self-regulation poses difficulties;third,users may potentially face disadvantages due to the platform’s right of self-regulation;and fourth,digital copyright owners face challenges when defending digital copyright disputes under the safe harbor rule.Therefore,it is imperative to establish,review,and revise the legal framework for content regulation of network platforms in order to enhance the efficiency of their governance systems.The formulation of the legal framework for content regulation of network platforms may encompass the following aspects:rationalizing obligations pertaining to platform content regulations,enhancing supervision over platform self-regulation,and establishing a dual-track responsibility system for digital copyright content regulation.This will ensure a harmonious balance among public interests,users’personal rights and interests,and commercial benefits through regulating the content on network platforms.
