Engineering surveying is an important course for road and bridge engineering technology majors in higher vocational colleges.With the advancement of science and technology,engineering surveying technology is also cons...Engineering surveying is an important course for road and bridge engineering technology majors in higher vocational colleges.With the advancement of science and technology,engineering surveying technology is also constantly developing,so the theoretical knowledge and professional skills that students need to master are also becoming increasingly complicated.To stimulate the students’interest in learning the course,it is necessary to continuously introduce innovative teaching methods into the course.In this paper,the importance of teaching innovation in engineering surveying courses of road and bridge engineering technology majors in higher vocational colleges and the knowledge system that students need to master are analyzed.Subsequently,innovative strategies are proposed to help improve the students’mastery of engineering surveying.展开更多
In this paper we will discuss the software engineering technology for the 21 st century. First we review development over the last half century, overview application requirement and environment, accept a challenge. Th...In this paper we will discuss the software engineering technology for the 21 st century. First we review development over the last half century, overview application requirement and environment, accept a challenge. Then we outline following software engineering techniques: 1) Process;2) Analysis;3) Design;4) UML;5) Component;6) Java +XML;7) Integrated;8) Quality(ISO9000&CMM).展开更多
This paper summarizes the important progress in the field of oil and gas production engineering during the"Thirteenth Five-Year Plan"period of China,analyzes the challenges faced by the current oil and gas p...This paper summarizes the important progress in the field of oil and gas production engineering during the"Thirteenth Five-Year Plan"period of China,analyzes the challenges faced by the current oil and gas production engineering in terms of technological adaptability,digital construction,energy-saving and emission reduction,and points out the future development direction.During the"Thirteenth Five-Year Plan"period,series of important progresses have been made in five major technologies,including separated-layer injection,artificial lift,reservoir stimulation,gas well de-watering,and workover,which provide key technical support for continuous potential tapping of mature oilfields and profitable production of new oilfields.Under the current complex international political and economic situation,oil and gas production engineering is facing severe challenges in three aspects:technical difficulty increases in oil and gas production,insignificant improvements in digital transformation,and lack of core technical support for energy-saving and emission reduction.This paper establishes three major strategic directions and implementation paths,including oil stabilization and gas enhancement,digital transformation,and green and low-carbon development.Five key research areas are listed including fine separated-layer injection technology,high efficiency artificial lift technology,fine reservoir stimulation technology,long term gas well de-watering technology and intelligent workover technology,so as to provide engineering technical support for the transformation,upgrading and high-quality development of China’s oil and gas industry.展开更多
This paper presented a model of integrated reverse engineering system and set up its various data output flowchart, which is easy to be associated with other systems. The idea of integrated reverse engineer is introdu...This paper presented a model of integrated reverse engineering system and set up its various data output flowchart, which is easy to be associated with other systems. The idea of integrated reverse engineer is introduced to the system of forming sheet metal with complex surface and using IDEF0 method sets up the function model of the system. The freeform surface reconstruction and CAD modeling of the system are described and decomposed. This paper discussed some problems, such as the feature expression, feature modeling and feature translation of the sheet parts and dies.展开更多
Chinas offshore areas abound in oil & gas resources, but both the intensity of prospecting and the produced outputs are low, as a result, there exists a lot of development potential. Our pursuit to develop offsh...Chinas offshore areas abound in oil & gas resources, but both the intensity of prospecting and the produced outputs are low, as a result, there exists a lot of development potential. Our pursuit to develop offshore marginal oilfields relies on up to date scientific and technological progress as well as modern development management and innovative technologies. China has developed domestically the designed technologies for beach and shallow water areas oil field operations. These technical and engineering systems have been adapted to meet Chinas characteristic, operational features and requirements. Despite of our ongoing efforts, it has not yet met the top international quality standards with regard to the demand for special oil gas bearings and project developments in the middle deep sea areas. The author will analyze the technical shortcomings of beach and shallow water areas exploration engineering, attempts to improve the recovery efficiency, offshore surface engineering technologies, production safeguards etc. A prognosis for the direction and innovate approach used in future management planning and project designs will be given.展开更多
Northeast China Electric PowerCombustion Research Center (NPCC) is ahigh-tech enterprise which deals with"science, industry, trade, education" togetherand is mainly engaged in the research anddevelopment in ...Northeast China Electric PowerCombustion Research Center (NPCC) is ahigh-tech enterprise which deals with"science, industry, trade, education" togetherand is mainly engaged in the research anddevelopment in the aspects of the combustiontechnology, energy conservation. safety-environmental protection, automatic controland so on. NPCC has the semi-industrial testlab, large-scale test equipment and advancedmeasurement apparatus and equipment, aswell as the equipment and workshop neededfor trans forming the results to industryapplication.NPCC has provided several sets oftechnology and equipment for the nationalimportant project of technology improvementand the project of domesticazation ofcombustion system of imported power plant.NPCC has comprehensive ability forproductions, engineering and correspondingtechnical equipment. In the aspect ofinternational joint-project, NPCC has alsoachieved the profit. NPCC is not only acomprehensive base of test research whichgets industry application, semi-industry testand industry test together. but also anengineering research center of applying theachievements in scientific research to high-tech products in batch process.展开更多
In the field of global oil and gas engineering science and technology, innovative progress has been made in deep sea exploration, unconventional oil and gas exploration, deep exploration in mature areas, and improveme...In the field of global oil and gas engineering science and technology, innovative progress has been made in deep sea exploration, unconventional oil and gas exploration, deep exploration in mature areas, and improvements in recovery efficiency and supporting technologies. The oil and gas industry in China has entered the stage of "simultaneous development of both shallow and deep sea areas, conventional and unconventional oil and gas, and onshore and offshore exploration", withonshore deep areas,deep sea areas,and unconventional oil and gas as important exploration priorities. Oil and gas engineering science and technology in China has seen 14 breakthroughs made in key areas and 6 key tasks to be completed in the fields of "onshore deep exploration, deep sea exploration, unconventional oil and gas exploration, recovery efficiency improvement and supporting engineering technologies". These developments will effectively promote the orderly succession of oil and gas exploration and the efficient use of oil and gas resources to achieve a sustained and healthy development of the oil and gas industry in China and boost the development and utilization of overseas resources.展开更多
Since the 1970's, frozen ground has been developing near the Tokyo Bay area around liquefied natural gas(LNG) inground storage tanks. For disaster prevention purposes, the tanks are constructed below the ground su...Since the 1970's, frozen ground has been developing near the Tokyo Bay area around liquefied natural gas(LNG) inground storage tanks. For disaster prevention purposes, the tanks are constructed below the ground surface. Since the temperature of the liquid stored in the tanks is -162℃ the soil surrounding the tanks freezes. Since this frozen ground has existed for almost half a century, we have permafrost near Tokyo. The development of artificial frozen ground may cause frost heaving, resulting in frost heave forces that may cause structural damage of adjacent LNG in-ground storage tanks.Therefore, the demand for frozen ground engineering increased and consequently we now have advanced technology in this area. Fortunately, we use this engineering technology and artificial ground freezing for civil engineering, especially in big and crowded cities like Tokyo. This paper provides a summary of the testing apparatus, test methods, and assessment methods for frost heaving.展开更多
To comply with the new requirements of increasingly stringent environmental regulations on petroleum products standards, petroleum refining enterprises along with revamping of production units must speed up technical ...To comply with the new requirements of increasingly stringent environmental regulations on petroleum products standards, petroleum refining enterprises along with revamping of production units must speed up technical progress in manufacturing clean gasoline/diesel to meet the environmental requirements and reduce production cost. After many years of unremitting efforts in this area SINOPEC has developed new diversified processes, catalysts and engineering techniques covering all domains of petroleum processing, resulting in an acce lerated pace for producing clean gasoline/diesel. This article based on the progress in fuel cleaning in China in recent years refers to the characteristics and application of major engineering techniques while offering suggestions on future technology development aimed at future progress in fuel cleaning inside SINOPEC.展开更多
In this paper, a wild boar head was taken as the bionic research object for the development of new ridgers, a kind of plough. The reverse engineering technology was adopted to obtain the surface geometrical informatio...In this paper, a wild boar head was taken as the bionic research object for the development of new ridgers, a kind of plough. The reverse engineering technology was adopted to obtain the surface geometrical information of the head. Several three-dimensional (3D) point clouds of the head were captured first using a non-touch laser scanner, and an integrated point cloud was generated by aligning these point clouds using UG/Imageware. Then, the digital surface model of the head was rebuilt by means of CATIA. The characteristic curves of the surface model were analyzed. The results show that the average error between the rebuilt surface and the point cloud is ?0.431 mm. The max curvature of the ridge on the neb of the head is 0.187 mm?1, and the max and min Gauss curvatures on the surface are 0.008 mm?2 and ?0.002 mm?2. These geometrical information are the essential parameters for biomimetics study of the ridger.展开更多
[Objective] The disulfide-rich conotoxin MrVIB was produced by simple and fast genetic engineering method,to find new efficient ways for the synthesis of natural active conotoxins.[Method] Primers of conotoxin gene Mr...[Objective] The disulfide-rich conotoxin MrVIB was produced by simple and fast genetic engineering method,to find new efficient ways for the synthesis of natural active conotoxins.[Method] Primers of conotoxin gene MrVIB were synthesized to construct expression vectors pET22b(+)/His-Xa-MrVIB and pE T32a/Trx-EK-MrVIB,which were transformed into BL21(DE3)pLysS and expressed under induction by IPTG.Recombinant proteins were purified by affinity chromatography using Ni-NTA agarose column,and the expression of the recombinant proteins was analyzed by Tricine-SDS-PAGE electrophoresis.[Result] The recombinant conotoxins His-Xa-MrVIB and Trx-EK-MrVIB were effectively expressed in E.coli,and purified by one-step affinity chromatography,and the purity of the recombinant conotoxins was greater than 90%.[Conclusion] The conotoxin MrVIB was effectively secreted and expressed by genetic engineering method,which could solve the problems in chemical synthesis of conotoxins including low yield,high cost and difficult purification.展开更多
Graphite tailings produced by natural graphite is usually regarded as garbage to be buried underground,which would result in a certain waste of resources.Here,in order to explore the utilization of natural graphite ta...Graphite tailings produced by natural graphite is usually regarded as garbage to be buried underground,which would result in a certain waste of resources.Here,in order to explore the utilization of natural graphite tailings(NGT),a liquid-polyacrylonitrile(LPAN)is used to modify the NGT fragments and aggregate them together to form secondary graphite particles with low surface area and high tap density.Moreover,the modified NGT show much better electrochemical performances than those of original one.When tested in full cells coupled with NMC532 cathode,the material achieves a high rate capability and cycle stability at the cutoff voltage of 4.25 V as well as 4.45 V,which maintains 84.32%capacity retention after 500 cycles at 1 C rate(4.25 V),higher than that of the pristine one(73.65%).The enhanced performances can be attributed to the use of LPAN to create a unique carbon layer upon graphite tailings to reconstruct surface and repair defects,and also to granulate an isotropic structure of secondary graphite particles,which can help to weaken the anisotropy of Li^(+)diffusion pathway and form a uniform,complete and stable solid-electrolyte-interface(SEI)on the surface of primary NGT fragments to promote a fast Li+diffusion and suppress lithium metal dendrites upon charge and discharge.展开更多
The surrounding geological conditions and supporting structures of underground engineering are often updated during construction,and these updates require repeated numerical modeling.To improve the numerical modeling ...The surrounding geological conditions and supporting structures of underground engineering are often updated during construction,and these updates require repeated numerical modeling.To improve the numerical modeling efficiency of underground engineering,a modularized and parametric modeling cloud server is developed by using Python codes.The basic framework of the cloud server is as follows:input the modeling parameters into the web platform,implement Rhino software and FLAC3D software to model and run simulations in the cloud server,and return the simulation results to the web platform.The modeling program can automatically generate instructions that can run the modeling process in Rhino based on the input modeling parameters.The main modules of the modeling program include modeling the 3D geological structures,the underground engineering structures,and the supporting structures as well as meshing the geometric models.In particular,various cross-sections of underground caverns are crafted as parametricmodules in themodeling program.Themodularized and parametric modeling program is used for a finite element simulation of the underground powerhouse of the Shuangjiangkou Hydropower Station.This complicatedmodel is rapidly generated for the simulation,and the simulation results are reasonable.Thus,this modularized and parametric modeling program is applicable for three-dimensional finite element simulations and analyses.展开更多
In recent years,China has made significant progress in the construction of highways,resulting in an improved highway network that has provided robust support for economic and social development.However,the rapid expan...In recent years,China has made significant progress in the construction of highways,resulting in an improved highway network that has provided robust support for economic and social development.However,the rapid expansion of highway construction,power supply,and distribution has led to several challenges in mechanical and electrical engineering technology.Ensuring the safe,stable,and cost-effective operation of the power supply and distribution system to meet the diverse requirements of highway operations has become a pressing issue.This article takes an example of a highway electromechanical engineering power supply and distribution construction project to provide insight into the construction process of highway electromechanical engineering power supply and distribution technology.展开更多
With the introduction of“new engineering,new medical science,new agricultural science,and new liberal arts”construction,the reform of college English teaching is also imperative.Scholars nationwide have conducted at...With the introduction of“new engineering,new medical science,new agricultural science,and new liberal arts”construction,the reform of college English teaching is also imperative.Scholars nationwide have conducted attempts in different aspects of college English teaching and produced fruitful results.Yet,more efforts should be made.This paper discusses the reforms made by Wuhan University of Technology,focusing on the reformation of curriculum.展开更多
To better improve the electrical safety of buildings and fulfill the role of lightning protection and grounding,this article combines cases and discusses seven aspects of lightning protection devices’construction tec...To better improve the electrical safety of buildings and fulfill the role of lightning protection and grounding,this article combines cases and discusses seven aspects of lightning protection devices’construction technology.These aspects include the lightning protection classification of buildings,air terminals,down conductors,grounding devices,division of lightning protection zones,and lightning electromagnetic pulse shielding.Through the introduction of this article,readers can gain a comprehensive understanding of the application and value of lightning protection grounding construction technology in building electrical installation projects.展开更多
With the rapid development of information technology,the demand for talents in the field of software engineering is growing.In order to cultivate high-quality software engineering talents who meet the market demand,un...With the rapid development of information technology,the demand for talents in the field of software engineering is growing.In order to cultivate high-quality software engineering talents who meet the market demand,universities have continuously carried out the construction of software engineering majors.Accreditation Board for Engineering and Technology(ABET)certification,as an internationally recognized higher education quality assurance system,provides important reference and guidance for the construction of software engineering majors.Guided by student learning outcomes and core competencies,combined with the characteristics of software engineering talent cultivation,the innovation of talent cultivation mode takes industry-education integration and school-enterprise cooperation as the main development paths and explores comprehensive reform of the major in terms of professional positioning and goals,curriculum system,teaching conditions,and teachers.This comprehensive reform model has effectively promoted the development of major construction and improved the quality of talent cultivation.展开更多
This article analyzes the application strategies of shotcrete anchor support technology using a highway bridge-tunnel construction project as an example.The article covers various strategies,including support plan for...This article analyzes the application strategies of shotcrete anchor support technology using a highway bridge-tunnel construction project as an example.The article covers various strategies,including support plan formulation,mortar shotcrete anchor construction,grid steel frame construction,steel mesh construction,and concrete support construction.This analysis aims to provide a guideline for those interested in applying this technology and improving the quality and safety of highway bridges and tunnels construction.展开更多
文摘Engineering surveying is an important course for road and bridge engineering technology majors in higher vocational colleges.With the advancement of science and technology,engineering surveying technology is also constantly developing,so the theoretical knowledge and professional skills that students need to master are also becoming increasingly complicated.To stimulate the students’interest in learning the course,it is necessary to continuously introduce innovative teaching methods into the course.In this paper,the importance of teaching innovation in engineering surveying courses of road and bridge engineering technology majors in higher vocational colleges and the knowledge system that students need to master are analyzed.Subsequently,innovative strategies are proposed to help improve the students’mastery of engineering surveying.
文摘In this paper we will discuss the software engineering technology for the 21 st century. First we review development over the last half century, overview application requirement and environment, accept a challenge. Then we outline following software engineering techniques: 1) Process;2) Analysis;3) Design;4) UML;5) Component;6) Java +XML;7) Integrated;8) Quality(ISO9000&CMM).
基金Supported by the Basic Science Center Project of National Natural Science Foundation of China(72088101)National Natural Science Funded Project(52074345)CNPC Scientific Research and Technology Development Project(2020D-5001-21)。
文摘This paper summarizes the important progress in the field of oil and gas production engineering during the"Thirteenth Five-Year Plan"period of China,analyzes the challenges faced by the current oil and gas production engineering in terms of technological adaptability,digital construction,energy-saving and emission reduction,and points out the future development direction.During the"Thirteenth Five-Year Plan"period,series of important progresses have been made in five major technologies,including separated-layer injection,artificial lift,reservoir stimulation,gas well de-watering,and workover,which provide key technical support for continuous potential tapping of mature oilfields and profitable production of new oilfields.Under the current complex international political and economic situation,oil and gas production engineering is facing severe challenges in three aspects:technical difficulty increases in oil and gas production,insignificant improvements in digital transformation,and lack of core technical support for energy-saving and emission reduction.This paper establishes three major strategic directions and implementation paths,including oil stabilization and gas enhancement,digital transformation,and green and low-carbon development.Five key research areas are listed including fine separated-layer injection technology,high efficiency artificial lift technology,fine reservoir stimulation technology,long term gas well de-watering technology and intelligent workover technology,so as to provide engineering technical support for the transformation,upgrading and high-quality development of China’s oil and gas industry.
基金The Research Fund for the Doctoral Pro- gram of Higher Education( 2 0 0 0 0 2 4838)
文摘This paper presented a model of integrated reverse engineering system and set up its various data output flowchart, which is easy to be associated with other systems. The idea of integrated reverse engineer is introduced to the system of forming sheet metal with complex surface and using IDEF0 method sets up the function model of the system. The freeform surface reconstruction and CAD modeling of the system are described and decomposed. This paper discussed some problems, such as the feature expression, feature modeling and feature translation of the sheet parts and dies.
文摘Chinas offshore areas abound in oil & gas resources, but both the intensity of prospecting and the produced outputs are low, as a result, there exists a lot of development potential. Our pursuit to develop offshore marginal oilfields relies on up to date scientific and technological progress as well as modern development management and innovative technologies. China has developed domestically the designed technologies for beach and shallow water areas oil field operations. These technical and engineering systems have been adapted to meet Chinas characteristic, operational features and requirements. Despite of our ongoing efforts, it has not yet met the top international quality standards with regard to the demand for special oil gas bearings and project developments in the middle deep sea areas. The author will analyze the technical shortcomings of beach and shallow water areas exploration engineering, attempts to improve the recovery efficiency, offshore surface engineering technologies, production safeguards etc. A prognosis for the direction and innovate approach used in future management planning and project designs will be given.
文摘Northeast China Electric PowerCombustion Research Center (NPCC) is ahigh-tech enterprise which deals with"science, industry, trade, education" togetherand is mainly engaged in the research anddevelopment in the aspects of the combustiontechnology, energy conservation. safety-environmental protection, automatic controland so on. NPCC has the semi-industrial testlab, large-scale test equipment and advancedmeasurement apparatus and equipment, aswell as the equipment and workshop neededfor trans forming the results to industryapplication.NPCC has provided several sets oftechnology and equipment for the nationalimportant project of technology improvementand the project of domesticazation ofcombustion system of imported power plant.NPCC has comprehensive ability forproductions, engineering and correspondingtechnical equipment. In the aspect ofinternational joint-project, NPCC has alsoachieved the profit. NPCC is not only acomprehensive base of test research whichgets industry application, semi-industry testand industry test together. but also anengineering research center of applying theachievements in scientific research to high-tech products in batch process.
文摘In the field of global oil and gas engineering science and technology, innovative progress has been made in deep sea exploration, unconventional oil and gas exploration, deep exploration in mature areas, and improvements in recovery efficiency and supporting technologies. The oil and gas industry in China has entered the stage of "simultaneous development of both shallow and deep sea areas, conventional and unconventional oil and gas, and onshore and offshore exploration", withonshore deep areas,deep sea areas,and unconventional oil and gas as important exploration priorities. Oil and gas engineering science and technology in China has seen 14 breakthroughs made in key areas and 6 key tasks to be completed in the fields of "onshore deep exploration, deep sea exploration, unconventional oil and gas exploration, recovery efficiency improvement and supporting engineering technologies". These developments will effectively promote the orderly succession of oil and gas exploration and the efficient use of oil and gas resources to achieve a sustained and healthy development of the oil and gas industry in China and boost the development and utilization of overseas resources.
文摘Since the 1970's, frozen ground has been developing near the Tokyo Bay area around liquefied natural gas(LNG) inground storage tanks. For disaster prevention purposes, the tanks are constructed below the ground surface. Since the temperature of the liquid stored in the tanks is -162℃ the soil surrounding the tanks freezes. Since this frozen ground has existed for almost half a century, we have permafrost near Tokyo. The development of artificial frozen ground may cause frost heaving, resulting in frost heave forces that may cause structural damage of adjacent LNG in-ground storage tanks.Therefore, the demand for frozen ground engineering increased and consequently we now have advanced technology in this area. Fortunately, we use this engineering technology and artificial ground freezing for civil engineering, especially in big and crowded cities like Tokyo. This paper provides a summary of the testing apparatus, test methods, and assessment methods for frost heaving.
文摘To comply with the new requirements of increasingly stringent environmental regulations on petroleum products standards, petroleum refining enterprises along with revamping of production units must speed up technical progress in manufacturing clean gasoline/diesel to meet the environmental requirements and reduce production cost. After many years of unremitting efforts in this area SINOPEC has developed new diversified processes, catalysts and engineering techniques covering all domains of petroleum processing, resulting in an acce lerated pace for producing clean gasoline/diesel. This article based on the progress in fuel cleaning in China in recent years refers to the characteristics and application of major engineering techniques while offering suggestions on future technology development aimed at future progress in fuel cleaning inside SINOPEC.
基金The authors are grateful for the financial support by the National Natural Science Foundation of China(Grant No.50635030)the Scientific and Technological Development Project of Jilin Province(Grant No.20050539)the"985 Project"of Jilin University.
文摘In this paper, a wild boar head was taken as the bionic research object for the development of new ridgers, a kind of plough. The reverse engineering technology was adopted to obtain the surface geometrical information of the head. Several three-dimensional (3D) point clouds of the head were captured first using a non-touch laser scanner, and an integrated point cloud was generated by aligning these point clouds using UG/Imageware. Then, the digital surface model of the head was rebuilt by means of CATIA. The characteristic curves of the surface model were analyzed. The results show that the average error between the rebuilt surface and the point cloud is ?0.431 mm. The max curvature of the ridge on the neb of the head is 0.187 mm?1, and the max and min Gauss curvatures on the surface are 0.008 mm?2 and ?0.002 mm?2. These geometrical information are the essential parameters for biomimetics study of the ridger.
基金Supported by Natural Science Foundation of China(81560611)Natural Science Foundation of Hainan Province(No.317170)
文摘[Objective] The disulfide-rich conotoxin MrVIB was produced by simple and fast genetic engineering method,to find new efficient ways for the synthesis of natural active conotoxins.[Method] Primers of conotoxin gene MrVIB were synthesized to construct expression vectors pET22b(+)/His-Xa-MrVIB and pE T32a/Trx-EK-MrVIB,which were transformed into BL21(DE3)pLysS and expressed under induction by IPTG.Recombinant proteins were purified by affinity chromatography using Ni-NTA agarose column,and the expression of the recombinant proteins was analyzed by Tricine-SDS-PAGE electrophoresis.[Result] The recombinant conotoxins His-Xa-MrVIB and Trx-EK-MrVIB were effectively expressed in E.coli,and purified by one-step affinity chromatography,and the purity of the recombinant conotoxins was greater than 90%.[Conclusion] The conotoxin MrVIB was effectively secreted and expressed by genetic engineering method,which could solve the problems in chemical synthesis of conotoxins including low yield,high cost and difficult purification.
基金the financial support of National Key Research and Development Program of China(No.2020YFC1909604)National Natural Science Foundation(NNSF)of China(Nos.52202269,52002248)+1 种基金Shenzhen Key Projects of Technological Research(No.JSGG20200925145800001)and Shenzhen Basic Research Project(Nos.JCYJ20190808145203535,JCYJ20190808163005631)for providing financial support for this work.We are also grateful to the Instrumental Analysis Center of Shenzhen University(Xili Campus)for providing the facilities for our material analyzes。
文摘Graphite tailings produced by natural graphite is usually regarded as garbage to be buried underground,which would result in a certain waste of resources.Here,in order to explore the utilization of natural graphite tailings(NGT),a liquid-polyacrylonitrile(LPAN)is used to modify the NGT fragments and aggregate them together to form secondary graphite particles with low surface area and high tap density.Moreover,the modified NGT show much better electrochemical performances than those of original one.When tested in full cells coupled with NMC532 cathode,the material achieves a high rate capability and cycle stability at the cutoff voltage of 4.25 V as well as 4.45 V,which maintains 84.32%capacity retention after 500 cycles at 1 C rate(4.25 V),higher than that of the pristine one(73.65%).The enhanced performances can be attributed to the use of LPAN to create a unique carbon layer upon graphite tailings to reconstruct surface and repair defects,and also to granulate an isotropic structure of secondary graphite particles,which can help to weaken the anisotropy of Li^(+)diffusion pathway and form a uniform,complete and stable solid-electrolyte-interface(SEI)on the surface of primary NGT fragments to promote a fast Li+diffusion and suppress lithium metal dendrites upon charge and discharge.
基金The Construction S&T Project of the Department of Transportation of Sichuan Province(Grant No.2023A02)the National Natural Science Foundation of China(No.52109135).
文摘The surrounding geological conditions and supporting structures of underground engineering are often updated during construction,and these updates require repeated numerical modeling.To improve the numerical modeling efficiency of underground engineering,a modularized and parametric modeling cloud server is developed by using Python codes.The basic framework of the cloud server is as follows:input the modeling parameters into the web platform,implement Rhino software and FLAC3D software to model and run simulations in the cloud server,and return the simulation results to the web platform.The modeling program can automatically generate instructions that can run the modeling process in Rhino based on the input modeling parameters.The main modules of the modeling program include modeling the 3D geological structures,the underground engineering structures,and the supporting structures as well as meshing the geometric models.In particular,various cross-sections of underground caverns are crafted as parametricmodules in themodeling program.Themodularized and parametric modeling program is used for a finite element simulation of the underground powerhouse of the Shuangjiangkou Hydropower Station.This complicatedmodel is rapidly generated for the simulation,and the simulation results are reasonable.Thus,this modularized and parametric modeling program is applicable for three-dimensional finite element simulations and analyses.
文摘In recent years,China has made significant progress in the construction of highways,resulting in an improved highway network that has provided robust support for economic and social development.However,the rapid expansion of highway construction,power supply,and distribution has led to several challenges in mechanical and electrical engineering technology.Ensuring the safe,stable,and cost-effective operation of the power supply and distribution system to meet the diverse requirements of highway operations has become a pressing issue.This article takes an example of a highway electromechanical engineering power supply and distribution construction project to provide insight into the construction process of highway electromechanical engineering power supply and distribution technology.
文摘With the introduction of“new engineering,new medical science,new agricultural science,and new liberal arts”construction,the reform of college English teaching is also imperative.Scholars nationwide have conducted attempts in different aspects of college English teaching and produced fruitful results.Yet,more efforts should be made.This paper discusses the reforms made by Wuhan University of Technology,focusing on the reformation of curriculum.
文摘To better improve the electrical safety of buildings and fulfill the role of lightning protection and grounding,this article combines cases and discusses seven aspects of lightning protection devices’construction technology.These aspects include the lightning protection classification of buildings,air terminals,down conductors,grounding devices,division of lightning protection zones,and lightning electromagnetic pulse shielding.Through the introduction of this article,readers can gain a comprehensive understanding of the application and value of lightning protection grounding construction technology in building electrical installation projects.
基金Digital Twin and Acoustic Perception Research Team(2021XJTD06)。
文摘With the rapid development of information technology,the demand for talents in the field of software engineering is growing.In order to cultivate high-quality software engineering talents who meet the market demand,universities have continuously carried out the construction of software engineering majors.Accreditation Board for Engineering and Technology(ABET)certification,as an internationally recognized higher education quality assurance system,provides important reference and guidance for the construction of software engineering majors.Guided by student learning outcomes and core competencies,combined with the characteristics of software engineering talent cultivation,the innovation of talent cultivation mode takes industry-education integration and school-enterprise cooperation as the main development paths and explores comprehensive reform of the major in terms of professional positioning and goals,curriculum system,teaching conditions,and teachers.This comprehensive reform model has effectively promoted the development of major construction and improved the quality of talent cultivation.
文摘This article analyzes the application strategies of shotcrete anchor support technology using a highway bridge-tunnel construction project as an example.The article covers various strategies,including support plan formulation,mortar shotcrete anchor construction,grid steel frame construction,steel mesh construction,and concrete support construction.This analysis aims to provide a guideline for those interested in applying this technology and improving the quality and safety of highway bridges and tunnels construction.
