Gypsum rocks are highly susceptible to mechanical deterioration under the coupled effects of wet-dry(W-D)cycles and flow rates,which significantly influence the stability of underground excavations.Despite extensive r...Gypsum rocks are highly susceptible to mechanical deterioration under the coupled effects of wet-dry(W-D)cycles and flow rates,which significantly influence the stability of underground excavations.Despite extensive research on the effects of W-D cycles,the coupling influence of flow rates and W-D cycles on gypsum rocks remains poorly understood.This study investigates the mechanical behavior and deterioration mechanisms of gypsum rocks subjected to varying W-D cycles and flow rate conditions.Axial compression tests,along with nuclear magnetic resonance(NMR)techniques,were employed to analyze the stress-strain response and microstructural changes.Based on the disturbed state concept(DSC)theory,a W-D deterioration model and a DSC-based constitutive model were developed to describe the degradation trends and mechanical responses of gypsum rocks under different conditions.The results demonstrate that key mechanical indices,elastic modulus,cohesion,uniaxial compressive strength(UCS),and internal friction angle,exhibit logarithmic declines with increasing W-D cycles,with higher flow rates accelerating the deterioration process.The theoretical models accurately capture the nonlinear compaction behavior,peak stress,and post-peak response of gypsum specimens.This study provides valuable insights for predicting the mechanical behavior of gypsum rocks and improving the stability assessments of underground structures under complex environmental conditions.展开更多
分析了描述逻辑循环术语集的研究现状和存在的问题,在F.Baader工作的基础上进一步研究了描述逻辑εL混合循环术语集的LCS(least common subsumer)和MSC(most specific concept)推理问题.给出了εL混合循环术语集的语法和语义.针对εL混...分析了描述逻辑循环术语集的研究现状和存在的问题,在F.Baader工作的基础上进一步研究了描述逻辑εL混合循环术语集的LCS(least common subsumer)和MSC(most specific concept)推理问题.给出了εL混合循环术语集的语法和语义.针对εL混合循环术语集LCS和MSC推理的需要,提出了TBox-完全的概念,并重新定义了描述图.使用描述图和TBox-完全给出了最大不动点语义下εL混合循环术语集LCS和MSC的推理算法,证明了推理算法的正确性,并证明了推理算法是多项式时间复杂的.该推理算法为εL混合循环术语集的LCS和MSC推理提供了理论基础.展开更多
Manuel C.Molles Jr.所著的Ecology:Concepts and Applications(《生态学:概念与应用》)在教材与网络资源的建设方面进行了有益的尝试,其主教材及辅助教学资源的设计理念值得借鉴。主教材从1999年到2008年出版了4版,主教材内容及版本更...Manuel C.Molles Jr.所著的Ecology:Concepts and Applications(《生态学:概念与应用》)在教材与网络资源的建设方面进行了有益的尝试,其主教材及辅助教学资源的设计理念值得借鉴。主教材从1999年到2008年出版了4版,主教材内容及版本更新快,力求及时反映学科前沿水平的新技术、新知识;正文内容和版式编排设计以读者为本,注重为学生服务;网上辅助教学资源围绕主教材的系列产品进行整体设计,体现利教利学的建设理念,既为教师教学提供帮助和指导,也重视给予学生自我发挥的空间,网站展示条理清晰,内容布局规范,内容介绍注重以读者为中心,满足不同客户的需求。展开更多
The existing studies of geological relics have formed a classification system,which is based on geological relic cause factors.According to the geological relics of the tourist conception and perspective of tourism ev...The existing studies of geological relics have formed a classification system,which is based on geological relic cause factors.According to the geological relics of the tourist conception and perspective of tourism evaluation examples from Hunan Province,the author proposed the展开更多
In the subtropical monsoon karst regions uplifted in the Quaternary, the cone karst coexists with many kind of topography, such as plains, valleys, depressions, poljes, bank slopes and terraces. This is the major diff...In the subtropical monsoon karst regions uplifted in the Quaternary, the cone karst coexists with many kind of topography, such as plains, valleys, depressions, poljes, bank slopes and terraces. This is the major difference between the distribution of the cone karst and the tower karst. The latter is observed only on plains or basins. This situation brings about the idea that there are different origins for cone karst and tower karst. Moreover, the main aspects of cone karst morphology is illustrated in this paper, through which an overall conception of the cone karst may be figured out.展开更多
Marxist theory is an im portant so urce of socialism core value theory,and building so cialism core values under the guidance of Marxist theory is a major proposition that must be considered in the ideological and pol...Marxist theory is an im portant so urce of socialism core value theory,and building so cialism core values under the guidance of Marxist theory is a major proposition that must be considered in the ideological and political education of the new era.Based on the Marxist materialist conception of history,this paper analyzed,from the Marxist perspective,the dialectical relationship between the free and full developm ent of people,the value of peo ple and social development,pointed out the existing problems in ideological and political education and the necessity of targeted education of the core values for teenagers,and proposed to develop and innovate the ways and methods of ideological and political education as well as carry out extensive education on the Marxism,socialism patriotism and Chinese traditional culture under the guidance of Marxist theory,for the purpose of helping teenagers build socialism core values and strengthen their faith in the socialist road with Chinese characteristics and the ideals and beliefs of communism.展开更多
Role based access control is one of the widely used access control models.There are investigations in the literature that use knowledge representation mechanisms such as formal concept analysis(FCA),description logics...Role based access control is one of the widely used access control models.There are investigations in the literature that use knowledge representation mechanisms such as formal concept analysis(FCA),description logics,and Ontology for representing access control mechanism.However,while using FCA,investigations reported in the literature so far work on the logic that transforms the three dimensional access control matrix into dyadic formal contexts.This transformation is mainly to derive the formal concepts,lattice structure and implications to represent role hierarchy and constraints of RBAC.In this work,we propose a methodology that models RBAC using triadic FCA without transforming the triadic access control matrix into dyadic formal contexts.Our discussion is on two lines of inquiry.We present how triadic FCA can provide a suitable representation of RBAC policy and we demonstrate how this representation follows role hierarchy and constraints of RBAC on sample healthcare network available in the literature.展开更多
A hybrid conceptual design approach was introduced in this study to develop a conceptual design of oil palm polymer composite automotive crash box(ACB). A combination of theory of inventive problem solving(TRIZ), morp...A hybrid conceptual design approach was introduced in this study to develop a conceptual design of oil palm polymer composite automotive crash box(ACB). A combination of theory of inventive problem solving(TRIZ), morphological charts and biomimetics was applied where the foremost requirements in terms of the material characteristics, function specifications, force identification, root cause analysis, geometry profile and design selection criteria were considered. The strategy was to use creations of nature to inspire five innovative conceptual designs of the ACB structure and the AHP method was applied to perform the pairwise analysis of selecting the best ACB conceptual design. A new conceptual design for a composite ACB was conceived bearing in mind the properties of natural fibre, unlike those of conventional materials such as steel alloys and aluminium alloys. The design with the highest ranking(26.6 %) was chosen as the final conceptual design, which was the one with a honeycomb structure for the outermost profile, reinforced with a spider web structure inside the part, supported by fibre foam structure extracted from the woodpecker sponge tissue at the centre to maximize the energy absorption capability. The new design could solve the problem of bending collapse which is a major cause of failure to absorb maximum impact energy for ACB during collision. However, the final conceptual design will still need several modifications for production and assembly purposes, which will be completed in a further study.展开更多
The theoretical formulations of Coulomb and Rankine still remain as the fundamental approaches to the analysis of most gravity-type retaining wall,with the assumption that sufficient lateral yield will occur to mobili...The theoretical formulations of Coulomb and Rankine still remain as the fundamental approaches to the analysis of most gravity-type retaining wall,with the assumption that sufficient lateral yield will occur to mobilize fully limited conditions behind the wall.The effects of the magnitude of wall movements and different wall-movement modes are not taken into consideration.The disturbance of backfill is considered to be related to the wall movement under translation mode.On the basis of disturbed state concept(DSC),a general disturbance function was proposed which ranged from-1 to 1.The disturbance variables could be determined from the measured wall movements.A novel approach that related to disturbed degree and the mobilized internal frictional angle of the backfill was also derived.A calculation method benefited from Rankine's theory and the proposed approach was established to predict the magnitude and distribution of earth pressure from the cohesionless backfill under translation mode.The predicted results,including the magnitude and distribution of earth pressure,show good agreement with those of the model test and the finite element method.In addition,the disturbance parameter b was also discussed.展开更多
Chemical concepts such as structure,bonding,reactivity,etc.have been widely used in the literature and text books to appreciate molecular properties and chemical transformations.Even though modern theoretical and comp...Chemical concepts such as structure,bonding,reactivity,etc.have been widely used in the literature and text books to appreciate molecular properties and chemical transformations.Even though modern theoretical and computational chemistry is well established from the perspective of accuracy and complexity,how to quantify these concepts is a still unresolved task.Conceptual density functional theory and its related recent developments provide unique opportunities to tackle this problem.In this Special Issue,27 contributions from top investigators over the world are collected to highlight the state-of-art research on this topic,which not only showcases the status of where we are now but also unveils a number to possible future directions to be pursued.展开更多
Role mining and setup affect the usage of role-based access control(RBAC).Traditionally,user's role and permission assigning are manipulated by security administrator of system.However,the cost is expensive and th...Role mining and setup affect the usage of role-based access control(RBAC).Traditionally,user's role and permission assigning are manipulated by security administrator of system.However,the cost is expensive and the operating process is complex.A new role analyzing method was proposed by generating mappings and using them to provide recommendation for systems.The relation among sets of permissions,roles and users was explored by generating mappings,and the relation between sets of users and attributes was analyzed by means of the concept lattice model,generating a critical mapping between the attribute and permission sets,and making the meaning of the role natural and operational.Thus,a role is determined by permission set and user's attributes.The generated mappings were used to automatically assign permissions and roles to new users.Experimental results show that the proposed algorithm is effective and efficient.展开更多
Three floating liquefaction concepts aiming at offshore natural gas recovery,Liquefied Natural Gas(LNG),Heavy Liquefied Gas(HLG)or another similar concept Pressurized Liquid Natural Gas(PLNG)and Liquefied Unprocessed ...Three floating liquefaction concepts aiming at offshore natural gas recovery,Liquefied Natural Gas(LNG),Heavy Liquefied Gas(HLG)or another similar concept Pressurized Liquid Natural Gas(PLNG)and Liquefied Unprocessed Well Stream(LUWS)have gained interest in the past decade,control or prevention of solid formation is crucial for all these processes.In this work,the solubility of carbon dioxide and heavy hydrocarbons in the gas mixture at low temperature is simulated and compared with literature data.Using Soave-Redlich-Kwong(SRK)equation of state(EOS)for the fluid phase and a fugacity model for the solid phase,the simulation of carbon dioxide solid behavior agrees with experimental data.The phenomenon of carbon dioxide and benzene solids existing together in gas mixture is analyzed,the result shows the difference in dealing with the potential solid formation components in the offshore liquefaction concepts.展开更多
To study the problem of knowledge translation in fuzzy approximation spaces, the concept of rough communication of crisp set in fuzzy approximation spaces is proposed. In a rough communication of crisp set in fuzzy ap...To study the problem of knowledge translation in fuzzy approximation spaces, the concept of rough communication of crisp set in fuzzy approximation spaces is proposed. In a rough communication of crisp set in fuzzy approximation spaces, the problem of uncertainty exists, for each agent has a different language and cannot provide precise communication to each other. By means of some concepts, such as CF rough communication cut, which is a bridge between fuzzy concept and crisp concept, cut analysis of CF rough communication is made, and the relation theorem between CF rough communication and rough communication of crisp concept is obtained. Finally, in order to give an intuitive analysis of the relation between CF rough communication and rough communication of crisp concept, an example is given.展开更多
基金Projects(52378392,52478390)supported by the National Natural Science Foundation of ChinaProject(2024J08213)supported by the Natural Science Foundation of Fujian Province,China+1 种基金Project(00387088)supported by the“Foal Eagle Program”Youth Top-notch Talent Project of Fujian Province,ChinaProject(GY-Z23072)supported by the Scientific Research Foundation of Fujian University of Technology,China。
文摘Gypsum rocks are highly susceptible to mechanical deterioration under the coupled effects of wet-dry(W-D)cycles and flow rates,which significantly influence the stability of underground excavations.Despite extensive research on the effects of W-D cycles,the coupling influence of flow rates and W-D cycles on gypsum rocks remains poorly understood.This study investigates the mechanical behavior and deterioration mechanisms of gypsum rocks subjected to varying W-D cycles and flow rate conditions.Axial compression tests,along with nuclear magnetic resonance(NMR)techniques,were employed to analyze the stress-strain response and microstructural changes.Based on the disturbed state concept(DSC)theory,a W-D deterioration model and a DSC-based constitutive model were developed to describe the degradation trends and mechanical responses of gypsum rocks under different conditions.The results demonstrate that key mechanical indices,elastic modulus,cohesion,uniaxial compressive strength(UCS),and internal friction angle,exhibit logarithmic declines with increasing W-D cycles,with higher flow rates accelerating the deterioration process.The theoretical models accurately capture the nonlinear compaction behavior,peak stress,and post-peak response of gypsum specimens.This study provides valuable insights for predicting the mechanical behavior of gypsum rocks and improving the stability assessments of underground structures under complex environmental conditions.
文摘分析了描述逻辑循环术语集的研究现状和存在的问题,在F.Baader工作的基础上进一步研究了描述逻辑εL混合循环术语集的LCS(least common subsumer)和MSC(most specific concept)推理问题.给出了εL混合循环术语集的语法和语义.针对εL混合循环术语集LCS和MSC推理的需要,提出了TBox-完全的概念,并重新定义了描述图.使用描述图和TBox-完全给出了最大不动点语义下εL混合循环术语集LCS和MSC的推理算法,证明了推理算法的正确性,并证明了推理算法是多项式时间复杂的.该推理算法为εL混合循环术语集的LCS和MSC推理提供了理论基础.
文摘Manuel C.Molles Jr.所著的Ecology:Concepts and Applications(《生态学:概念与应用》)在教材与网络资源的建设方面进行了有益的尝试,其主教材及辅助教学资源的设计理念值得借鉴。主教材从1999年到2008年出版了4版,主教材内容及版本更新快,力求及时反映学科前沿水平的新技术、新知识;正文内容和版式编排设计以读者为本,注重为学生服务;网上辅助教学资源围绕主教材的系列产品进行整体设计,体现利教利学的建设理念,既为教师教学提供帮助和指导,也重视给予学生自我发挥的空间,网站展示条理清晰,内容布局规范,内容介绍注重以读者为中心,满足不同客户的需求。
文摘The existing studies of geological relics have formed a classification system,which is based on geological relic cause factors.According to the geological relics of the tourist conception and perspective of tourism evaluation examples from Hunan Province,the author proposed the
文摘In the subtropical monsoon karst regions uplifted in the Quaternary, the cone karst coexists with many kind of topography, such as plains, valleys, depressions, poljes, bank slopes and terraces. This is the major difference between the distribution of the cone karst and the tower karst. The latter is observed only on plains or basins. This situation brings about the idea that there are different origins for cone karst and tower karst. Moreover, the main aspects of cone karst morphology is illustrated in this paper, through which an overall conception of the cone karst may be figured out.
基金the periodic research result of the project“Research on the Construction of Marxist Popular Carrier”(Project No.15SQWT16)commissioned by the Central Bureau of Compiler。
文摘Marxist theory is an im portant so urce of socialism core value theory,and building so cialism core values under the guidance of Marxist theory is a major proposition that must be considered in the ideological and political education of the new era.Based on the Marxist materialist conception of history,this paper analyzed,from the Marxist perspective,the dialectical relationship between the free and full developm ent of people,the value of peo ple and social development,pointed out the existing problems in ideological and political education and the necessity of targeted education of the core values for teenagers,and proposed to develop and innovate the ways and methods of ideological and political education as well as carry out extensive education on the Marxism,socialism patriotism and Chinese traditional culture under the guidance of Marxist theory,for the purpose of helping teenagers build socialism core values and strengthen their faith in the socialist road with Chinese characteristics and the ideals and beliefs of communism.
基金the financial support from Department of Science and Technology,Government of India under the grant:SR/CSRI/118/2014
文摘Role based access control is one of the widely used access control models.There are investigations in the literature that use knowledge representation mechanisms such as formal concept analysis(FCA),description logics,and Ontology for representing access control mechanism.However,while using FCA,investigations reported in the literature so far work on the logic that transforms the three dimensional access control matrix into dyadic formal contexts.This transformation is mainly to derive the formal concepts,lattice structure and implications to represent role hierarchy and constraints of RBAC.In this work,we propose a methodology that models RBAC using triadic FCA without transforming the triadic access control matrix into dyadic formal contexts.Our discussion is on two lines of inquiry.We present how triadic FCA can provide a suitable representation of RBAC policy and we demonstrate how this representation follows role hierarchy and constraints of RBAC on sample healthcare network available in the literature.
基金Project(6369107)supported by the Ministry of Higher Education,Malaysia
文摘A hybrid conceptual design approach was introduced in this study to develop a conceptual design of oil palm polymer composite automotive crash box(ACB). A combination of theory of inventive problem solving(TRIZ), morphological charts and biomimetics was applied where the foremost requirements in terms of the material characteristics, function specifications, force identification, root cause analysis, geometry profile and design selection criteria were considered. The strategy was to use creations of nature to inspire five innovative conceptual designs of the ACB structure and the AHP method was applied to perform the pairwise analysis of selecting the best ACB conceptual design. A new conceptual design for a composite ACB was conceived bearing in mind the properties of natural fibre, unlike those of conventional materials such as steel alloys and aluminium alloys. The design with the highest ranking(26.6 %) was chosen as the final conceptual design, which was the one with a honeycomb structure for the outermost profile, reinforced with a spider web structure inside the part, supported by fibre foam structure extracted from the woodpecker sponge tissue at the centre to maximize the energy absorption capability. The new design could solve the problem of bending collapse which is a major cause of failure to absorb maximum impact energy for ACB during collision. However, the final conceptual design will still need several modifications for production and assembly purposes, which will be completed in a further study.
基金Project(50678158) supported by the National Natural Science Foundation of China
文摘The theoretical formulations of Coulomb and Rankine still remain as the fundamental approaches to the analysis of most gravity-type retaining wall,with the assumption that sufficient lateral yield will occur to mobilize fully limited conditions behind the wall.The effects of the magnitude of wall movements and different wall-movement modes are not taken into consideration.The disturbance of backfill is considered to be related to the wall movement under translation mode.On the basis of disturbed state concept(DSC),a general disturbance function was proposed which ranged from-1 to 1.The disturbance variables could be determined from the measured wall movements.A novel approach that related to disturbed degree and the mobilized internal frictional angle of the backfill was also derived.A calculation method benefited from Rankine's theory and the proposed approach was established to predict the magnitude and distribution of earth pressure from the cohesionless backfill under translation mode.The predicted results,including the magnitude and distribution of earth pressure,show good agreement with those of the model test and the finite element method.In addition,the disturbance parameter b was also discussed.
基金We are immensely indebted to the Editor-in-Chief as well as the entire crew of the Editorial Office of Acta Physico-Chimica Sinica for making the Special Issue possible. I am in particular grateful to Dr. Xiaojuan Zhang, the Managing Editor, and Dr. Ying
文摘Chemical concepts such as structure,bonding,reactivity,etc.have been widely used in the literature and text books to appreciate molecular properties and chemical transformations.Even though modern theoretical and computational chemistry is well established from the perspective of accuracy and complexity,how to quantify these concepts is a still unresolved task.Conceptual density functional theory and its related recent developments provide unique opportunities to tackle this problem.In this Special Issue,27 contributions from top investigators over the world are collected to highlight the state-of-art research on this topic,which not only showcases the status of where we are now but also unveils a number to possible future directions to be pursued.
基金Project(61003140) supported by the National Natural Science Foundation of ChinaProject(013/2010/A) supported by Macao Science and Technology Development FundProject(10YJC630236) supported by Social Science Foundation for the Youth Scholars of Ministry of Education of China
文摘Role mining and setup affect the usage of role-based access control(RBAC).Traditionally,user's role and permission assigning are manipulated by security administrator of system.However,the cost is expensive and the operating process is complex.A new role analyzing method was proposed by generating mappings and using them to provide recommendation for systems.The relation among sets of permissions,roles and users was explored by generating mappings,and the relation between sets of users and attributes was analyzed by means of the concept lattice model,generating a critical mapping between the attribute and permission sets,and making the meaning of the role natural and operational.Thus,a role is determined by permission set and user's attributes.The generated mappings were used to automatically assign permissions and roles to new users.Experimental results show that the proposed algorithm is effective and efficient.
基金sponsored by the Research Council of Norway 2007-2009 National Strategic Research Programme[Institusjonsforankret strategisk prosjekt(ISP)]
文摘Three floating liquefaction concepts aiming at offshore natural gas recovery,Liquefied Natural Gas(LNG),Heavy Liquefied Gas(HLG)or another similar concept Pressurized Liquid Natural Gas(PLNG)and Liquefied Unprocessed Well Stream(LUWS)have gained interest in the past decade,control or prevention of solid formation is crucial for all these processes.In this work,the solubility of carbon dioxide and heavy hydrocarbons in the gas mixture at low temperature is simulated and compared with literature data.Using Soave-Redlich-Kwong(SRK)equation of state(EOS)for the fluid phase and a fugacity model for the solid phase,the simulation of carbon dioxide solid behavior agrees with experimental data.The phenomenon of carbon dioxide and benzene solids existing together in gas mixture is analyzed,the result shows the difference in dealing with the potential solid formation components in the offshore liquefaction concepts.
基金supported by the Natural Science Foundation of Shandong Province (Y2006A12)the Scientific Research Development Project of Shandong Provincial Education Department (J06P01)+2 种基金the Science and Technology Foundation of Universityof Jinan (XKY0808 XKY0703)the Doctoral Foundation of University of Jinan (B0633).
文摘To study the problem of knowledge translation in fuzzy approximation spaces, the concept of rough communication of crisp set in fuzzy approximation spaces is proposed. In a rough communication of crisp set in fuzzy approximation spaces, the problem of uncertainty exists, for each agent has a different language and cannot provide precise communication to each other. By means of some concepts, such as CF rough communication cut, which is a bridge between fuzzy concept and crisp concept, cut analysis of CF rough communication is made, and the relation theorem between CF rough communication and rough communication of crisp concept is obtained. Finally, in order to give an intuitive analysis of the relation between CF rough communication and rough communication of crisp concept, an example is given.
