Instead of studying the impact of media on society,the traditional"top down"orientation of most communication studies scholars,this keynote presentation adopted the opposite perspective,exploring the"bo...Instead of studying the impact of media on society,the traditional"top down"orientation of most communication studies scholars,this keynote presentation adopted the opposite perspective,exploring the"bottom-up"impact of"society"on"media".Unlike conventional"agenda-setting theory",which suggests that nationally prominent news media set issue"agendas"for other news media and public opinion,and also unlike the"guard dog"view that media essentially protect the interests of political and economic elites,the"community structure theory"explores links between different community(typically city or nation-state)demographics and variations in reporting on critical health concerns.Summarizing his scholarship on health communication presented and published over decades,the speaker outlined community structure theory's illumination of two overall patterns in US and cross-national coverage of health communication issues.In US coverage,broad measures of economically"buffered"privilege(educational,income,or occupational advantage)are linked to"favorable"or"government responsibility"coverage of health issues,and specific measures of"health"privilege(physicians,hospitals)are connected to"favorable"or"government responsibility"coverage promoting selected health issues.In cross-national coverage,specific measures of national"health vulnerability"(such as percent without improved water access,infant mortality rate)are linked to"government"responsibility coverage for selected health issues(human trafficking,water handling/contamination).In addition,broad measures of"macro"vulnerability conditions(agricultural dependence,political instability)are associated with"government"responsibility coverage for a wide range of health issues(genetically modified foods,drug trafficking,condom promotion,and food security).Overall,community structure theory's"bottom up"perspective reveals how the vulnerable are empowered by their demographic alignment with variations in health communication.展开更多
Based on behavior science and direct causes analysis of serious accidents in Chinese coal mines in recent 5 years, a conclusion that unsafe behaviors of coal mine staff were the direct causes of these serious accident...Based on behavior science and direct causes analysis of serious accidents in Chinese coal mines in recent 5 years, a conclusion that unsafe behaviors of coal mine staff were the direct causes of these serious accidents was drawn, accounting for 91.3%. If staff was divided into executor and manager, percentages of the executor's and manager's unsafe behaviors in direct causes of the accidents were 69% and 54%, respectively, with executor's unsafe behavior as direct causes and manager's unsafe behavior as essential reasons after thorough analysis of these accidents. Further, on the basis of dual structure theory analysis, three new understandings, including transformation, hierarchy classification and representativeness of behavior factors were il- lustrated. Behavior factors of executors and managers in Chinese coal mines were summarized and classified by new recogni- tion. Then, dual structure theory was applied in a coal mine in Hebei Province of China; weakening unsafe behaviors and strengthening safe factors can attain the purpose of motivating safer behaviors in the coal mine.展开更多
Construction of forestry socialized service systems is the important content for reform of collective forestry tenure systems.Based on the necessity,possibility and problem of construction of forestry socialized servi...Construction of forestry socialized service systems is the important content for reform of collective forestry tenure systems.Based on the necessity,possibility and problem of construction of forestry socialized service system,according to Barnard's Organizational Structure theory,the path and countermeasure of forestry socialized service system in China are discussed.展开更多
The rural revitalization strategy is a macro-strategic guide to solve the problem of"weak links"in the coordinated development of rural and urban regions.Geography responded positively to the national strate...The rural revitalization strategy is a macro-strategic guide to solve the problem of"weak links"in the coordinated development of rural and urban regions.Geography responded positively to the national strategy and made a preliminary discussion on the scientific theoretical basis and research direction of rural revitalization strategy.The paper integrated application of the spatial structure theory of geography and the time-space research scientific thinking,respectively discussed the core edge theory,growth pole and point axis theory,theory of stage of industrialization and urbanization,rural settlement type,infrastructure construction patterns,such as the theoretical guidance and application of strategy of rejuvenating rural to rural revitalization of the full implementation of the strategy to provide theoretical support and practical guidance.展开更多
Enterprise capital structure means the various resources, combination and relationships of enterprise raising capital as well as means the short or long debts, shareholders' rights and interest, and the proportional ...Enterprise capital structure means the various resources, combination and relationships of enterprise raising capital as well as means the short or long debts, shareholders' rights and interest, and the proportional relationships among constituting items. Capitals raised by enterprise from different ways constitute the capital sum. Because of changing enterprise operation, the capital structure is also various and it cannot be in a fixed proportion. Therefore, we need to optimize the capital structure of state-owned enterprises so as to reach the rational resources allocation and make the national economy develop soundly and rapidly. How to optimize it? This is a big problem that we have to face. Debt-to-equity swap at the moment is only the transition for correcting capital structure of state-owned enterprises. Decreasing stocks owned by state is the inevitable choice for optimizing enterprise stock right.展开更多
This work explores the axiology of consciousness in Mocombe’s consciousness field in the material world.The paper critically assesses Mocombe’s consciousness field theory(CFT)within the larger body of contemporary o...This work explores the axiology of consciousness in Mocombe’s consciousness field in the material world.The paper critically assesses Mocombe’s consciousness field theory(CFT)within the larger body of contemporary ontological debates regarding the nature,origin,and constitution of consciousness in the universe.The work goes on to highlight the manifestation of Mocombe’s consciousness field in the material resource framework that is the earth,and the nature and origins of ethics and values.展开更多
The anomalous dimensions of the quantum fields are the Hausdorff dimensiongrad. The present candidate of the renormalization constant is the generalized Cantor discontinuum. The Hausdorff dimensiongrad of the Minkowsk...The anomalous dimensions of the quantum fields are the Hausdorff dimensiongrad. The present candidate of the renormalization constant is the generalized Cantor discontinuum. The Hausdorff dimensiongrad of the Minkowski space time is based upon the point set with σ-length on light cone.展开更多
The geometric theory of quasicrystal structure is an important subject in quasicrystal research. The authors deduce the quasicrystal plane geometric lattices from the stereograms of quasicrystal space geometric lattic...The geometric theory of quasicrystal structure is an important subject in quasicrystal research. The authors deduce the quasicrystal plane geometric lattices from the stereograms of quasicrystal space geometric lattice , and put them together to form the geometric lattices of quasicrystal structures . The general characteristics of quasicrystal geometric lattices , the relation between structural models and geometric lattices , and the relation formula (k=0 , 2 , 4 , 6 , 8, 10,12) of the symmetric axis between quasicrystal and crystal are discussed based on the quasicrystal space geometric lattices. This is of significant in quasicrystal research .展开更多
The geometries, stabilities, and electronic properties of FSin (n=1~12) clusters are systematically investigated by using first-principles calculations based on the hybrid density-functional theory at the B3LYP/6-3...The geometries, stabilities, and electronic properties of FSin (n=1~12) clusters are systematically investigated by using first-principles calculations based on the hybrid density-functional theory at the B3LYP/6-311G level. The geometries are found to undergo a structural change from two-dimensional to three-dimensional structure when the cluster size n equals 3. On the basis of the obtained lowest-energy geometries, the size dependencies of cluster properties, such as averaged binding energy, fragmentation energy, second-order energy difference, HOMO–LUMO (highest occupied molecular orbital–lowest unoccupied molecular orbital) gap and chemical hardness, are discussed. In addition, natural population analysis indicates that the F atom in the most stable FSin cluster is recorded as being negative and the charges always transfer from Si atoms to the F atom in the FSin clusters.展开更多
By studying the relationship between physical structure and function in physical chemistry, the author breaks through the limitation of the western narrow social and cultural structure and function theory, and further...By studying the relationship between physical structure and function in physical chemistry, the author breaks through the limitation of the western narrow social and cultural structure and function theory, and further derives and founds the Confucian cultural structure and function theory, thus creating a new research methodology and broadening the research horizon. Through the research, it is found that the Confucian culture structure consists of the hard structure "ritual" and the soft structure "benevolence", and based on this constructs three-outline, five- principal, four-moral, eight- virtul, five cardinal principals and other Confucian culture, so that these have a social management function, resulting in a 2000-year stable Chinese social order, which also provides reference for the social management of Chinese government today.展开更多
In this paper, a kind of rationalism theory of shell is established which is of different mechanic characters in tension and in compression, and the finite element numerical analysis method is also described.
Against behaviorism,humanism,and cognitive psychology,this work explores Mocombe’s antihuman psychology as a product of his consciousness field theory.The paper critically assesses Mocombe’s consciousness field theo...Against behaviorism,humanism,and cognitive psychology,this work explores Mocombe’s antihuman psychology as a product of his consciousness field theory.The paper critically assesses Mocombe’s consciousness field theory within the larger body of contemporary ontological debates regarding the nature,origin,and constitution of consciousness,especially human consciousness,vis-à-vis their relations to the psychological theories of behaviorism,humanism,and cognitivism,concluding that consciousness field theory posits an alternative psychological theory of the mind,i.e.,antihuman psychology,to behaviorist,humanist,and cognitivist conceptions of the mind.展开更多
The genetic based Dual Instinct Theory is determined by evolutionary history. Aggression is required for survival and sex for propagation of species. Aggressive and sexual drive derivatives with their corresponding de...The genetic based Dual Instinct Theory is determined by evolutionary history. Aggression is required for survival and sex for propagation of species. Aggressive and sexual drive derivatives with their corresponding defence mechanisms are combined with biologically based stages of infant/child development and the functional entity of Structural Theory. This model of human nature is the applied to the diagnostic categories of DSM-5-TR. Objectives: To follow the innate Dual Instinct Theory from life to death and through Artificial Intelligence;connect it with biological stages of development of the Structural Theory and illustrate its manifestations in DSM-5-TR classifications. Method: Review of selected published literature. Applying the principle of focus and cognition of informed clinical observation of innate drive derivatives in conjunction with The Structural Theory. Both theories are functional entities with no structures involved. Sigmund Freud’s biologically based stages of development;oral, anal, genital pubic, adult, and geriatric along with a variety of unconscious, automatic, and persistent defense mechanisms are selectively folded into diagnosis listed in the manual.展开更多
During the underground mining of coal resources,overlying rocks on the roof of excavated tunnels will be destroyed due to ground pressure,and as a result,part of them will break and fall into the tunnels.How to determ...During the underground mining of coal resources,overlying rocks on the roof of excavated tunnels will be destroyed due to ground pressure,and as a result,part of them will break and fall into the tunnels.How to determine the distribution of fractured areas and fissures presents a major problem for preserving the overlying aquifer.展开更多
The structure and magnetic properties of Osn (n=11~22) clusters are systematically studied by using density functional theory (DFT). For each size, the average binding energy per atom, the second-order difference...The structure and magnetic properties of Osn (n=11~22) clusters are systematically studied by using density functional theory (DFT). For each size, the average binding energy per atom, the second-order differences of total energies and the highest occupied molecular orbital (HOMO)–the lowest unoccupied molecular orbital (LUMO) gaps are calculated to analyze the stability of the cluster. The structures of Os14 and Os18 clusters are based on a close-packed hexagonal structure, and they have maximum stabilities, so n=14, 18 are the magic numbers. The 5d electrons play a dominant role in the chemical reaction of Osn clusters. The magnetic moments of Osn clusters are quenched around n=12, and when n=18~22 the value approximates to zero, due to the difference of electron transfer.展开更多
The atomic geometry, structure stability, electronic and magnetic properties of VSe2 were systematically investigated based on the density functional theory(DFT). Varying from 3D to 2D four VSe2 structures, bulk 2H-...The atomic geometry, structure stability, electronic and magnetic properties of VSe2 were systematically investigated based on the density functional theory(DFT). Varying from 3D to 2D four VSe2 structures, bulk 2H-VSe2 and 1T-VSe2, monolayer H-VSe2 and T-VSe2 are all demonstrated as thermodynamically stable by lattice dynamic calculations. More interestingly, the phase transition temperature is dramatically different due to the lattice size. Finally, owing to different crystal structures, H-VSe2 is semimetallic whereas T-VSe2 is totally metallic and also they have different magnetic moments. Our main argument is that being exfoliated from bulk to monolayer, 2H-VSe2 transforms to T-VSe2, accompanied by both semimetallic-metallic transition and dramatic magnetic moment variation. Our calculations provide a novel structure phase transition and an efficient way to modulate the electronic structure and magnetic moment of layered VSe2, which suggests potential applications as high-performance functional nanomaterial.展开更多
An integration of organization culture in the conceptualization and development of Enterprise Resource Planning Systems (ERPs) is critical for an organization to reap potential benefits of the system. In this paper,...An integration of organization culture in the conceptualization and development of Enterprise Resource Planning Systems (ERPs) is critical for an organization to reap potential benefits of the system. In this paper, the authors present an analytical approach through the Structuration Theory: How a university can assess its culture for the purposes of design and development of the ERPs. The authors extend the Structuration Theory by integrating it with the Activity Theory to provide the means of evaluating the activities that the system is to perform. The modified Orlikowski model is applied to depict the relationship between institutional properties, human agents, and technology in the university setup and how this offers a more inclusive approach to ERP systems development and implementation.展开更多
This paper investigates the effectiveness of various factors upon the capital structure decisions of Chinese firms by conducting an empirical analysis of Chinese-listed retail companies.An unbalanced panel dataset was...This paper investigates the effectiveness of various factors upon the capital structure decisions of Chinese firms by conducting an empirical analysis of Chinese-listed retail companies.An unbalanced panel dataset was formed with a sample of 110 companies observed for 12 years(2010~2021).Each observation is measured quarterly.Traditional explanatory variables are adopted in the study,including profitability,company size,tangibility of assets,internal financing ability,tax ratio,growth opportunities,and volatility.By employing the Fama-Macbeth approach,the regression results are interpreted to determine the impact of independent variables upon the leverage a company takes on.To solve the reverse causality problem,we include the lag term(last quarter’s data)of the debt-to-equity ratio as control variables.Consistent with previous theoretical and empirical studies,firms’leverage ratio is positively related to size,tangibility,tax ratio,and last quarter’s debt level.Companies’profitability and internal financing ability are negatively correlated with their debt-to-equity ratio.Firms’earning volatility and growth opportunities do not show significant relationship with the debt-to-equity ratio.The study has provided more empirical evidence on capital structure theories regarding emerging financial markets.展开更多
A theoretical study on oligopeptide chains of glycine-alanine by density functional theory(DFT) is given in this paper. Raman spectra of the oligopeptide chains are examined. The geometric structures, frontier orbit...A theoretical study on oligopeptide chains of glycine-alanine by density functional theory(DFT) is given in this paper. Raman spectra of the oligopeptide chains are examined. The geometric structures, frontier orbital, energy gap, atomic charge distribution, density of states and chemical activity of the side chain are studied at the B3LYP/6-31G(d) level. Results show that, with the number of residues increasing, vibrations of typical functional groups present Raman frequency shift, and the energy gap is gradually reduced. The HOMO and LUMO focus on the amino and carboxyl at the ends of oligopeptides. It is helpful for oligopeptides to self-assemble into chains. In addition, different residues(glycine or alanine) at the ends of chains result in the even-odd effect of orbital energy in the growth process. The size effects of physical and chemical properties only exist when the oligopeptides are shorter, and the phenomenon disappeared as the chain continues to grow.展开更多
文摘Instead of studying the impact of media on society,the traditional"top down"orientation of most communication studies scholars,this keynote presentation adopted the opposite perspective,exploring the"bottom-up"impact of"society"on"media".Unlike conventional"agenda-setting theory",which suggests that nationally prominent news media set issue"agendas"for other news media and public opinion,and also unlike the"guard dog"view that media essentially protect the interests of political and economic elites,the"community structure theory"explores links between different community(typically city or nation-state)demographics and variations in reporting on critical health concerns.Summarizing his scholarship on health communication presented and published over decades,the speaker outlined community structure theory's illumination of two overall patterns in US and cross-national coverage of health communication issues.In US coverage,broad measures of economically"buffered"privilege(educational,income,or occupational advantage)are linked to"favorable"or"government responsibility"coverage of health issues,and specific measures of"health"privilege(physicians,hospitals)are connected to"favorable"or"government responsibility"coverage promoting selected health issues.In cross-national coverage,specific measures of national"health vulnerability"(such as percent without improved water access,infant mortality rate)are linked to"government"responsibility coverage for selected health issues(human trafficking,water handling/contamination).In addition,broad measures of"macro"vulnerability conditions(agricultural dependence,political instability)are associated with"government"responsibility coverage for a wide range of health issues(genetically modified foods,drug trafficking,condom promotion,and food security).Overall,community structure theory's"bottom up"perspective reveals how the vulnerable are empowered by their demographic alignment with variations in health communication.
文摘Based on behavior science and direct causes analysis of serious accidents in Chinese coal mines in recent 5 years, a conclusion that unsafe behaviors of coal mine staff were the direct causes of these serious accidents was drawn, accounting for 91.3%. If staff was divided into executor and manager, percentages of the executor's and manager's unsafe behaviors in direct causes of the accidents were 69% and 54%, respectively, with executor's unsafe behavior as direct causes and manager's unsafe behavior as essential reasons after thorough analysis of these accidents. Further, on the basis of dual structure theory analysis, three new understandings, including transformation, hierarchy classification and representativeness of behavior factors were il- lustrated. Behavior factors of executors and managers in Chinese coal mines were summarized and classified by new recogni- tion. Then, dual structure theory was applied in a coal mine in Hebei Province of China; weakening unsafe behaviors and strengthening safe factors can attain the purpose of motivating safer behaviors in the coal mine.
文摘Construction of forestry socialized service systems is the important content for reform of collective forestry tenure systems.Based on the necessity,possibility and problem of construction of forestry socialized service system,according to Barnard's Organizational Structure theory,the path and countermeasure of forestry socialized service system in China are discussed.
基金Supported by Henan Social Science Planning Project(2021BJJ119)Henan Provincial University Science and Technology Innovation Talent Support Plan(2021-CX-013)+2 种基金Henan Science and Technology Think Tank Project(HNKJZK-2022-12B)Independent Innovation Application Research Project of Zhongyuan University of Technology(K2020YY022)Science and Technology Research Project of Henan Provincial Science and Technology Department(182102310748).
文摘The rural revitalization strategy is a macro-strategic guide to solve the problem of"weak links"in the coordinated development of rural and urban regions.Geography responded positively to the national strategy and made a preliminary discussion on the scientific theoretical basis and research direction of rural revitalization strategy.The paper integrated application of the spatial structure theory of geography and the time-space research scientific thinking,respectively discussed the core edge theory,growth pole and point axis theory,theory of stage of industrialization and urbanization,rural settlement type,infrastructure construction patterns,such as the theoretical guidance and application of strategy of rejuvenating rural to rural revitalization of the full implementation of the strategy to provide theoretical support and practical guidance.
文摘Enterprise capital structure means the various resources, combination and relationships of enterprise raising capital as well as means the short or long debts, shareholders' rights and interest, and the proportional relationships among constituting items. Capitals raised by enterprise from different ways constitute the capital sum. Because of changing enterprise operation, the capital structure is also various and it cannot be in a fixed proportion. Therefore, we need to optimize the capital structure of state-owned enterprises so as to reach the rational resources allocation and make the national economy develop soundly and rapidly. How to optimize it? This is a big problem that we have to face. Debt-to-equity swap at the moment is only the transition for correcting capital structure of state-owned enterprises. Decreasing stocks owned by state is the inevitable choice for optimizing enterprise stock right.
文摘This work explores the axiology of consciousness in Mocombe’s consciousness field in the material world.The paper critically assesses Mocombe’s consciousness field theory(CFT)within the larger body of contemporary ontological debates regarding the nature,origin,and constitution of consciousness in the universe.The work goes on to highlight the manifestation of Mocombe’s consciousness field in the material resource framework that is the earth,and the nature and origins of ethics and values.
文摘The anomalous dimensions of the quantum fields are the Hausdorff dimensiongrad. The present candidate of the renormalization constant is the generalized Cantor discontinuum. The Hausdorff dimensiongrad of the Minkowski space time is based upon the point set with σ-length on light cone.
文摘The geometric theory of quasicrystal structure is an important subject in quasicrystal research. The authors deduce the quasicrystal plane geometric lattices from the stereograms of quasicrystal space geometric lattice , and put them together to form the geometric lattices of quasicrystal structures . The general characteristics of quasicrystal geometric lattices , the relation between structural models and geometric lattices , and the relation formula (k=0 , 2 , 4 , 6 , 8, 10,12) of the symmetric axis between quasicrystal and crystal are discussed based on the quasicrystal space geometric lattices. This is of significant in quasicrystal research .
基金Project supported by the National Natural Science Foundation of China(Grant Nos.11304167 and 51374132)the Postdoctoral Science Foundation of China(Grant No.20110491317)+1 种基金the Young Core Instructor Foundation of Henan Province,China(Grant No.2012GGJS-152)the Natural Science Foundation of Henan Province,China(Grant Nos.132300410209 and 132300410290)
文摘The geometries, stabilities, and electronic properties of FSin (n=1~12) clusters are systematically investigated by using first-principles calculations based on the hybrid density-functional theory at the B3LYP/6-311G level. The geometries are found to undergo a structural change from two-dimensional to three-dimensional structure when the cluster size n equals 3. On the basis of the obtained lowest-energy geometries, the size dependencies of cluster properties, such as averaged binding energy, fragmentation energy, second-order energy difference, HOMO–LUMO (highest occupied molecular orbital–lowest unoccupied molecular orbital) gap and chemical hardness, are discussed. In addition, natural population analysis indicates that the F atom in the most stable FSin cluster is recorded as being negative and the charges always transfer from Si atoms to the F atom in the FSin clusters.
文摘By studying the relationship between physical structure and function in physical chemistry, the author breaks through the limitation of the western narrow social and cultural structure and function theory, and further derives and founds the Confucian cultural structure and function theory, thus creating a new research methodology and broadening the research horizon. Through the research, it is found that the Confucian culture structure consists of the hard structure "ritual" and the soft structure "benevolence", and based on this constructs three-outline, five- principal, four-moral, eight- virtul, five cardinal principals and other Confucian culture, so that these have a social management function, resulting in a 2000-year stable Chinese social order, which also provides reference for the social management of Chinese government today.
文摘In this paper, a kind of rationalism theory of shell is established which is of different mechanic characters in tension and in compression, and the finite element numerical analysis method is also described.
文摘Against behaviorism,humanism,and cognitive psychology,this work explores Mocombe’s antihuman psychology as a product of his consciousness field theory.The paper critically assesses Mocombe’s consciousness field theory within the larger body of contemporary ontological debates regarding the nature,origin,and constitution of consciousness,especially human consciousness,vis-à-vis their relations to the psychological theories of behaviorism,humanism,and cognitivism,concluding that consciousness field theory posits an alternative psychological theory of the mind,i.e.,antihuman psychology,to behaviorist,humanist,and cognitivist conceptions of the mind.
文摘The genetic based Dual Instinct Theory is determined by evolutionary history. Aggression is required for survival and sex for propagation of species. Aggressive and sexual drive derivatives with their corresponding defence mechanisms are combined with biologically based stages of infant/child development and the functional entity of Structural Theory. This model of human nature is the applied to the diagnostic categories of DSM-5-TR. Objectives: To follow the innate Dual Instinct Theory from life to death and through Artificial Intelligence;connect it with biological stages of development of the Structural Theory and illustrate its manifestations in DSM-5-TR classifications. Method: Review of selected published literature. Applying the principle of focus and cognition of informed clinical observation of innate drive derivatives in conjunction with The Structural Theory. Both theories are functional entities with no structures involved. Sigmund Freud’s biologically based stages of development;oral, anal, genital pubic, adult, and geriatric along with a variety of unconscious, automatic, and persistent defense mechanisms are selectively folded into diagnosis listed in the manual.
基金supported by the State Key Program of National Natural Science of China(Grant No.41130637)
文摘During the underground mining of coal resources,overlying rocks on the roof of excavated tunnels will be destroyed due to ground pressure,and as a result,part of them will break and fall into the tunnels.How to determine the distribution of fractured areas and fissures presents a major problem for preserving the overlying aquifer.
基金Project supported by the National Natural Science Foundation of China(Grant No.51072072)
文摘The structure and magnetic properties of Osn (n=11~22) clusters are systematically studied by using density functional theory (DFT). For each size, the average binding energy per atom, the second-order differences of total energies and the highest occupied molecular orbital (HOMO)–the lowest unoccupied molecular orbital (LUMO) gaps are calculated to analyze the stability of the cluster. The structures of Os14 and Os18 clusters are based on a close-packed hexagonal structure, and they have maximum stabilities, so n=14, 18 are the magic numbers. The 5d electrons play a dominant role in the chemical reaction of Osn clusters. The magnetic moments of Osn clusters are quenched around n=12, and when n=18~22 the value approximates to zero, due to the difference of electron transfer.
基金Funded by the National Natural Science Foundation of China(No.11547115)the Science Research Foundation for Ph D of Liaoning Province(No.201501091)
文摘The atomic geometry, structure stability, electronic and magnetic properties of VSe2 were systematically investigated based on the density functional theory(DFT). Varying from 3D to 2D four VSe2 structures, bulk 2H-VSe2 and 1T-VSe2, monolayer H-VSe2 and T-VSe2 are all demonstrated as thermodynamically stable by lattice dynamic calculations. More interestingly, the phase transition temperature is dramatically different due to the lattice size. Finally, owing to different crystal structures, H-VSe2 is semimetallic whereas T-VSe2 is totally metallic and also they have different magnetic moments. Our main argument is that being exfoliated from bulk to monolayer, 2H-VSe2 transforms to T-VSe2, accompanied by both semimetallic-metallic transition and dramatic magnetic moment variation. Our calculations provide a novel structure phase transition and an efficient way to modulate the electronic structure and magnetic moment of layered VSe2, which suggests potential applications as high-performance functional nanomaterial.
文摘An integration of organization culture in the conceptualization and development of Enterprise Resource Planning Systems (ERPs) is critical for an organization to reap potential benefits of the system. In this paper, the authors present an analytical approach through the Structuration Theory: How a university can assess its culture for the purposes of design and development of the ERPs. The authors extend the Structuration Theory by integrating it with the Activity Theory to provide the means of evaluating the activities that the system is to perform. The modified Orlikowski model is applied to depict the relationship between institutional properties, human agents, and technology in the university setup and how this offers a more inclusive approach to ERP systems development and implementation.
文摘This paper investigates the effectiveness of various factors upon the capital structure decisions of Chinese firms by conducting an empirical analysis of Chinese-listed retail companies.An unbalanced panel dataset was formed with a sample of 110 companies observed for 12 years(2010~2021).Each observation is measured quarterly.Traditional explanatory variables are adopted in the study,including profitability,company size,tangibility of assets,internal financing ability,tax ratio,growth opportunities,and volatility.By employing the Fama-Macbeth approach,the regression results are interpreted to determine the impact of independent variables upon the leverage a company takes on.To solve the reverse causality problem,we include the lag term(last quarter’s data)of the debt-to-equity ratio as control variables.Consistent with previous theoretical and empirical studies,firms’leverage ratio is positively related to size,tangibility,tax ratio,and last quarter’s debt level.Companies’profitability and internal financing ability are negatively correlated with their debt-to-equity ratio.Firms’earning volatility and growth opportunities do not show significant relationship with the debt-to-equity ratio.The study has provided more empirical evidence on capital structure theories regarding emerging financial markets.
基金Supported by the National Natural Science Foundation of China(No.60878063)the Program from Traditional Chinese Medicine Bureau of Guangdong Province(No.2008233)
文摘A theoretical study on oligopeptide chains of glycine-alanine by density functional theory(DFT) is given in this paper. Raman spectra of the oligopeptide chains are examined. The geometric structures, frontier orbital, energy gap, atomic charge distribution, density of states and chemical activity of the side chain are studied at the B3LYP/6-31G(d) level. Results show that, with the number of residues increasing, vibrations of typical functional groups present Raman frequency shift, and the energy gap is gradually reduced. The HOMO and LUMO focus on the amino and carboxyl at the ends of oligopeptides. It is helpful for oligopeptides to self-assemble into chains. In addition, different residues(glycine or alanine) at the ends of chains result in the even-odd effect of orbital energy in the growth process. The size effects of physical and chemical properties only exist when the oligopeptides are shorter, and the phenomenon disappeared as the chain continues to grow.