The aim of this paper is to provide a clear insight about the determinants of female employment rate in the European Union where we have used panel data analyses of 27 countries members of the European Union from 1995...The aim of this paper is to provide a clear insight about the determinants of female employment rate in the European Union where we have used panel data analyses of 27 countries members of the European Union from 1995 till 2009. Applying dynamic modeling, i.e, generalized method of moments (GMM) econometrics findings have driven us to system estimated model where the following institutional variables have been tested: maternity leave, child care facilities, college education, fertility rate, GDP growth, female unemployment rate and part-time employment. We expect these variables to have a positive impact on the female employment rate except for the female unemployment rate and maternity leave展开更多
Group-invariant solutions to certain plane curve motions in Euclidean and centro-affine geometries areobtained. The behavior of some solutions is also presented.
We propose an efficient and robust algorithm to solve the steady Euler equa- tions on unstructured grids.The new algorithm is a Newton-iteration method in which each iteration step is a linear multigrid method using b...We propose an efficient and robust algorithm to solve the steady Euler equa- tions on unstructured grids.The new algorithm is a Newton-iteration method in which each iteration step is a linear multigrid method using block lower-upper symmetric Gauss-Seidel(LU-SGS)iteration as its smoother To regularize the Jacobian matrix of Newton-iteration,we adopted a local residual dependent regularization as the replace- ment of the standard time-stepping relaxation technique based on the local CFL number The proposed method can be extended to high order approximations and three spatial dimensions in a nature way.The solver was tested on a sequence of benchmark prob- lems on both quasi-uniform and local adaptive meshes.The numerical results illustrated the efficiency and robustness of our algorithm.展开更多
The Changbai Mountains and the Appalachian Mountains have similar spatial contexts.The elevation,latitude,and moisture gradients of both mountain ranges offer regional insight for investigating the vegetation dynamics...The Changbai Mountains and the Appalachian Mountains have similar spatial contexts.The elevation,latitude,and moisture gradients of both mountain ranges offer regional insight for investigating the vegetation dynamics in eastern Eurasia and eastern North America.We determined and compared the spatial patterns and temporal trends in the normalized difference vegetation index(NDVI)in the Changbai Mountains and the Appalachian Mountains using time series data from the Global Inventory Modeling and Mapping Studies 3^(rd) generation dataset from 1982 to 2013.The spatial pattern of NDVI in the Changbai Mountains exhibited fragmentation,whereas NDVI in the Appalachian Mountains decreased from south to north.The vegetation dynamics in the Changbai Mountains had an insignificant trend at the regional scale,whereas the dynamics in the Appalachian Mountains had a significant increasing trend.NDVI increased in 55% of the area of the Changbai Mountains and in 95% of the area of the Appalachian Mountains.The peak NDVI occurred one month later in the Changbai Mountains than in the Appalachian Mountains.The results revealed a significant increase in NDVI in autumn in both mountain ranges.The climatic trend in the Changbai Mountains included warming and decreased precipitation,and whereas that in the Appalachian Mountains included significant warming and increased precipitation.Positive and negative correlations existed between NDVI and temperature and precipitation,respectively,in both mountain ranges.Particularly,the spring temperature and NDVI exhibited a significant positive correlation in both mountain ranges.The results of this study suggest that human actives caused the differences in the spatial patterns of NDVI and that various characteristics of climate change and intensity of human actives dominated the differences in the NDVI trends between the Changbai Mountains and the Appalachian Mountains.Additionally,the vegetation dynamics of both mountain ranges were not identical to those in previous broader-scale studies.展开更多
The kinetic theory of granular flow (KTGF) is modified to fit the Einstein′s equation for effective viscosity of dilute flow. A pseudo-fluid approach based on this modified KTGF is used to simulate the dynamic format...The kinetic theory of granular flow (KTGF) is modified to fit the Einstein′s equation for effective viscosity of dilute flow. A pseudo-fluid approach based on this modified KTGF is used to simulate the dynamic formation and dissipation of clusters in a circulating fluidized bed riser. The agglomeration of particles reduces slip velocity within particle clusters, and hence results in two reverse trends: discrete particles are lifted by air while particle clusters fall down along the wall. The dynamic equilibrium of these two types of motion leads to the characteristic sigmoid profile of solid concentration along the longitudinal direction. The predicted solid velocity, lateral and longitudinal profiles of solid volume fraction and annulus thickness are in reasonable agreement with experimental results.展开更多
Following the author's own experiencing in supervising Ph.D. theses in literature, languages, linguistics, and teacher education, the author will focus on new trends of advanced research projects that have been contr...Following the author's own experiencing in supervising Ph.D. theses in literature, languages, linguistics, and teacher education, the author will focus on new trends of advanced research projects that have been contributing to reinforce the importance of research in these areas in a time of crisis in the humanities. The organization and funding of science and scholarship in Europe has been promoting anything else but social sciences research, including educational areas. The author will follow the recent call from the Board of Trustees da Academia Europaea to redirect policies toward the organization of multidisciplinary research projects. Among these so-called "small subjects", we will find original, inspired, and valuable research projects in the humanities, It is worth mentioning that the crisis that has been diminishing this type of scholarship strangely cohabits with several policies promoted by the European Commission and the Council of Europe to develop programs for plurilingual education and linguistic diversity, new framework strategies for multilingualism, and the use of new technologies for language teaching and learning. A strong emphasis on research projects leading to interdisciplinary studies involving literature and pure sciences, plus the development of outreach research projects will be proposed.展开更多
Although industrial processes often perform perfectly under design conditions, they may deviate from the optimal operating point owing to parameters drift, environmental disturbances, etc. Thus, it is necessary to dev...Although industrial processes often perform perfectly under design conditions, they may deviate from the optimal operating point owing to parameters drift, environmental disturbances, etc. Thus, it is necessary to develop efficacious strategies or procedure to assess the process performance online. In this paper, we explore the issue of operating optimality assessment for complex industrial processes based on performance-similarity considering nonlinearities and outliers simultaneously, and a general enforced online performance assessment framework is proposed. In the offline part, a new and modified total robust kernel projection to latent structures algorithm,T-KPRM, is proposed and used to evaluate the complex nonlinear industrial process, which can effectively extract the optimal-index-related process variation information from process data and establish assessment models for each performance grades overcoming the effects of outlier. In the online part, the online assessment results can be obtained by calculating the similarity between the online data from a sliding window and each of the performance grades. Furthermore, in order to improve the accuracy of online assessment, we propose an online assessment strategy taking account of the effects of noise and process uncertainties. The Euclidean distance between the sliding data window and the optimal evaluation level is employed to measure the contribution rates of variables, which indicate the possible reason for the non-optimal operating performance. The proposed framework is tested on a real industrial case: dense medium coal preparation process, and the results shows the efficiency of the proposed method comparing to the existing method.展开更多
This research observed and evaluated the sustainability practices in universities. This study emphasizes the connection between theory and practice in research frame. It is intended by this research using content anal...This research observed and evaluated the sustainability practices in universities. This study emphasizes the connection between theory and practice in research frame. It is intended by this research using content analysis of UI GreenMetric, universities' websites and sustainability annual reports observing universities' practices related to sustainability to answer the research question, which is: How are university managements embedding sustainability-oriented practices in sustainability focused European universities as far as CORE system (Curriculum, Operations, Research, and Engagement) is considered? The employed research methodology mainly relies on content analysis of the studied universities from the UI GreenMetric Sustainable University assessment and ranking index. The UI GreenMetric Sustainable University assessment and ranking index was selected since it considers the Operations, Curriculum, Research, and Engagements (CORE system) of universities with indicators such as Setting and Infrastructure, Energy and Climate Change, Waste, Water, Transportation, and Education. This covers the triple bottom line of sustainability (Environment, Economy, and Society) and other indexes like GASU, AASHE, STARS and others, focused mostly on operational Eco-efficiency. UI GreenMetric index is the first and the only ranking that measures each participating university's commitment in developing an "environmentally friendly" infrastructure. The total sample of the study observed and evaluated in this study are five (5) top European Sustainable Universities according to UI GreenMetric sustainable ranking index. The result shows a significant progress in Operational practices except in the area of Campus Setting and Infrastructure. There was a less significant progress in the Curriculum, Research, and Engagement practices of the CORE system of sustainability-oriented practices which are being integrated into the studied universities. This research provides a state of the art result regarding the embeddedness of sustainable practice in European universities. It has the potential to help any university to better integrate sustainability in their management system.展开更多
The collision and wear caused by inevitable clearance in kinematic pair have an effect on the dynamic characteristics of the mechanism.Therefore,we established the dynamic model of a 3RSR(R is the revolute joint and S...The collision and wear caused by inevitable clearance in kinematic pair have an effect on the dynamic characteristics of the mechanism.Therefore,we established the dynamic model of a 3RSR(R is the revolute joint and S is the spherical joint)parallel mechanism with spherical joint clearance based on the modified Flores contact force model and the modified Coulomb friction model using Newton-Euler method.The standard quaternion was introduced in the constraint equation,and the four-order Runge-Kutta method was adopted to solve the 3RSR dynamic model.The simulation results were compared and analyzed with the numerical results.The geometrical parameters of the worn ball socket were solved based on the Archard wear model,and the geometrical reconstruction of the worn surface was carried out.The geometric reconstruction parameters were substituted into the dynamic model,which was to analyze the dynamic response of the 3RSR parallel mechanism with wear and spherical joint clearance.The simulation results show that the irregular wear occurs in the spherical joint with clearance under the presence of the impact and friction force.The long-term wear will increase the fluctuation of the contact force,thereby decreasing the movement stability of the mechanism.展开更多
It is argued that it has not yet been able to value the historical, philosophical and epistemological travail, represented by the filth and fourth centuries BC of the ancient Greek world, which preceded the highest sc...It is argued that it has not yet been able to value the historical, philosophical and epistemological travail, represented by the filth and fourth centuries BC of the ancient Greek world, which preceded the highest scientific heritage, represented by the so-called golden age of Euclid, Archimedes and Apollonius, Ⅲ-Ⅱ century BC. Well, it is believed that with our complex concept of tradition of thought within which we insert not only epistemological concepts but also philosophical principles, historical and social frameworks, in stasis or in strong movement, processed by us, it is possible better interpret that happy moment of scientific constructions of the third and second century BC, as a result of the valorization of the deep travail and serious battle that preceded it between the fourth and fifth century BC. It is investigated in particular in our paper the development of astronomical thought between the fifth and fourth centuries BC, in the ancient Greek thought, and at last a particular presumed criticism by Archimedes in his Sandreckoner to Aristarchus.展开更多
The paper addresses the formulation of rate equations, via objective time derivatives, within continuum physics. The concept of objectivity is reviewed and distinction is made with material frame-indifference whose me...The paper addresses the formulation of rate equations, via objective time derivatives, within continuum physics. The concept of objectivity is reviewed and distinction is made with material frame-indifference whose meaning is restricted to the invariance of the balance equations relative to Galilean frames. Objective time derivatives are defined to leave the tensor character of the appropriate field invariant within the set of Euclidean frames. Rate equations are required to involve objective time derivatives and to be consistent with the second law of thermodynamics. Here the general structure of objective time derivatives is established and the known derivatives of the physical literature are shown to be particular cases. Next, to fix ideas, a rate equation is considered for the model of heat conduction via a generalization of the Maxwell-Cattaneo equation with higher-order gradients as in the Guyer-Krumhansl equation. The thermodynamic restrictions are investigated and the expected effects, of the selected derivative of the heat flux, on the stress tensor are derived.展开更多
Temporal and spatial patterns of inherent optical properties in the Bohai Sea are very complex. In this paper, we used 77 groups of field data of AOPs (apparent optical properties) and IOPs (inherent optical proper...Temporal and spatial patterns of inherent optical properties in the Bohai Sea are very complex. In this paper, we used 77 groups of field data of AOPs (apparent optical properties) and IOPs (inherent optical properties) collected in June, August, and September of 2005 in the Bohai Sea, to retrieve the spectral total absorption coefficient a(2) with the quasi-analytical algorithm (QAA). For QAA implementation, different bands in the region 680-730 nm (in 5 nm intervals) were selected and compared, to determine the optimal band domain of the reference wavelength. On this basis, we proposed a new algorithm (QAA-Com), a combination of QAA-685 and QAA-715, according to turbidity characterized by a(440). The percentage difference of model retrievals in the visible domain was between 4.5%-45.1%, in average of 18.8% for a(2). The QAA model was then applied to Medium Resolution Imaging Spectrometer (MERIS) radiometric products, which were temporally and spatially matched with in-situ optical measurements. Differences between MERIS retrievals and in-situ values were in the range 9.2%-27.8% for a(2) in the visible domain. Major errors in satellite retrieval are attributable to uncertainties of QAA model parameters and in-situ measurements, as well as imperfect atmospheric correction of MERIS data by the European Space Agency (ESA). During a storm surge in April 2009, time series of MERIS images together with the QAA model were used to analyze spatial and temporal variability of the total absorption coefficient pattern in the Bohai Sea. It is necessary to collect more independent field data to improve this algorithm.展开更多
USA as an ICT (Information and Communication Technology) innovative leader, Europe with its knowledge offensive and Asia as the fastest growing economies share the common fate: ICT projects do under perform. Numero...USA as an ICT (Information and Communication Technology) innovative leader, Europe with its knowledge offensive and Asia as the fastest growing economies share the common fate: ICT projects do under perform. Numerous surveys point at human factor as a source of this malheur. The question emerge to what extent project manager is responsible for improvements there, and which particular skills are demanded to turn the ICT projects course towards more predictable, more efficient and better budget able endeavours. Authors examined and compared the scientific and practitioners views. Twenty-nine journal and conference papers and 46 monographs and standards dedicated to project manager skills have been scrutinized. Further 324 jobs advertisements for the ICT project managers in USA, Switzerland, Poland and Thailand underwent an analysis related to the demanded soft skills of the project manager. The L-Timer~ taxonomy of human factor related processes in project management is applied as comparison vehicle. Methodology extracted main (global) terms and detailed aspects, both weighted appropriately. The practitioners on all continents expect primarily communication skills followed by the team management abilities. Human resource is partially treated, while conflict management is underrepresented. The science seems to be focused on leadership followed by the communication skills, neglecting self management skills of project managers. The last are surprisingly well represented in the US advertisement. The USA job advertisements are the most comprehensive and elaborated one--and, what might be explained by high impact of American science on job definition--close to the scientific details of skill description, self management excluded. In Poland, team management appears to be a problem, while Thailand's companies seek leaders first. The best balanced approach might be found in Swiss job advertisements. The inter-cultural differences point at impact of cultural heritage, which call for differentiated view of science on demanded project manager human factor related skills. Authors pursue this fascinating research.展开更多
Based on my teaching and working experience in Europe, I have made a comparison between the Chinese and European patients in acupuncture treatment, and hope it is of some significance in acupuncture clinical practice.
By the sketch of structure of MVWG,the working laws of this kind of gyroscope we re explained.To the aid of Euler′s Dynamics Equation,a mathematical model of the gyroscope was constructed,and then by the basic workin...By the sketch of structure of MVWG,the working laws of this kind of gyroscope we re explained.To the aid of Euler′s Dynamics Equation,a mathematical model of the gyroscope was constructed,and then by the basic working laws of MVWG the model was simplified.Under the conditions of the three axial direction rotations and general rotation,the mathematical model was resolved.And finally by the solutions, the working laws of the gyroscope, the working disparity among all sorts of gyrations and the influences from the gyrations in the axial directions were analysed.展开更多
A machine-learning(ML)model,the light gradient boosting machine(LightGBM),was constructed to simulate the variation in the summer(June-July-August)heatwave frequency(HWF)over eastern Europe(HWFUR)and to analyze the co...A machine-learning(ML)model,the light gradient boosting machine(LightGBM),was constructed to simulate the variation in the summer(June-July-August)heatwave frequency(HWF)over eastern Europe(HWFUR)and to analyze the contributions of various lower-boundary climate factors to the HWFUR variation.The examined lower-boundary climate factors were those that may contribute to the HWFUR variation—namely,the sea surface temperature,soil moisture,snow-cover extent,and sea-ice concentration from the simultaneous summer,preceding spring,and winter.These selected climate factors were significantly correlated to the summer HWFUR variation and were used to construct the ML model.Both the hindcast simulation of HWF EUR for the period 1981-2020 and its real-time simulation for the period 2011-2020,which used the constructed ML model,were investigated.To evaluate the contributions of the climate factors,various model experiments using different combinations of the climate factors were examined and compared.The results indicated that the LightGBM model had comparatively good performance in simulating the HWFUR variation.The sea surface temperature made more contributions to the ML model simulation than the other climate factors.Further examination showed that the best ML simulation was that which used the climate factors in the preceding winter,suggesting that the lower-boundary conditions in the preceding winter may be critical in forecasting the summer HWFUR variation.展开更多
Data Envelopment Analysis (DEA) is a powerful mathematical optimization method widely used for measuring, evaluating and improving the performance of Decision Making Units (DMUs). These used in the various forms, ...Data Envelopment Analysis (DEA) is a powerful mathematical optimization method widely used for measuring, evaluating and improving the performance of Decision Making Units (DMUs). These used in the various forms, such as hospitals, government agencies, educational institutions, air force, bank branches, business finns, sport teams and even people including the performance of countries, regions, etc. Recently DEA has been extended to examine the performance through the different sport types. In this paper, a Stochastic Input Oriented Data Envelopment Analysis (SIODEA) Model is conducted for measuring and evaluating the relative efficiency scores of football teams selected from different European countries during 2014/2015 season each with some of inputs are stochastic with normally distributed and recent inputs are deterministic and outputs, to shed light on the professional football teams performance.展开更多
文摘The aim of this paper is to provide a clear insight about the determinants of female employment rate in the European Union where we have used panel data analyses of 27 countries members of the European Union from 1995 till 2009. Applying dynamic modeling, i.e, generalized method of moments (GMM) econometrics findings have driven us to system estimated model where the following institutional variables have been tested: maternity leave, child care facilities, college education, fertility rate, GDP growth, female unemployment rate and part-time employment. We expect these variables to have a positive impact on the female employment rate except for the female unemployment rate and maternity leave
文摘Group-invariant solutions to certain plane curve motions in Euclidean and centro-affine geometries areobtained. The behavior of some solutions is also presented.
文摘We propose an efficient and robust algorithm to solve the steady Euler equa- tions on unstructured grids.The new algorithm is a Newton-iteration method in which each iteration step is a linear multigrid method using block lower-upper symmetric Gauss-Seidel(LU-SGS)iteration as its smoother To regularize the Jacobian matrix of Newton-iteration,we adopted a local residual dependent regularization as the replace- ment of the standard time-stepping relaxation technique based on the local CFL number The proposed method can be extended to high order approximations and three spatial dimensions in a nature way.The solver was tested on a sequence of benchmark prob- lems on both quasi-uniform and local adaptive meshes.The numerical results illustrated the efficiency and robustness of our algorithm.
基金supported by the National Natural Science Foundation of China (Grant No. 41601438 and 41571078)the Fundamental Research Funds for the Central Universities (Grant No.2412016KJ026)the Foundation of the Education Department of Jilin Province in the 13~(th) Five-Year project (Grant No. JJKH20170916KJ)
文摘The Changbai Mountains and the Appalachian Mountains have similar spatial contexts.The elevation,latitude,and moisture gradients of both mountain ranges offer regional insight for investigating the vegetation dynamics in eastern Eurasia and eastern North America.We determined and compared the spatial patterns and temporal trends in the normalized difference vegetation index(NDVI)in the Changbai Mountains and the Appalachian Mountains using time series data from the Global Inventory Modeling and Mapping Studies 3^(rd) generation dataset from 1982 to 2013.The spatial pattern of NDVI in the Changbai Mountains exhibited fragmentation,whereas NDVI in the Appalachian Mountains decreased from south to north.The vegetation dynamics in the Changbai Mountains had an insignificant trend at the regional scale,whereas the dynamics in the Appalachian Mountains had a significant increasing trend.NDVI increased in 55% of the area of the Changbai Mountains and in 95% of the area of the Appalachian Mountains.The peak NDVI occurred one month later in the Changbai Mountains than in the Appalachian Mountains.The results revealed a significant increase in NDVI in autumn in both mountain ranges.The climatic trend in the Changbai Mountains included warming and decreased precipitation,and whereas that in the Appalachian Mountains included significant warming and increased precipitation.Positive and negative correlations existed between NDVI and temperature and precipitation,respectively,in both mountain ranges.Particularly,the spring temperature and NDVI exhibited a significant positive correlation in both mountain ranges.The results of this study suggest that human actives caused the differences in the spatial patterns of NDVI and that various characteristics of climate change and intensity of human actives dominated the differences in the NDVI trends between the Changbai Mountains and the Appalachian Mountains.Additionally,the vegetation dynamics of both mountain ranges were not identical to those in previous broader-scale studies.
文摘The kinetic theory of granular flow (KTGF) is modified to fit the Einstein′s equation for effective viscosity of dilute flow. A pseudo-fluid approach based on this modified KTGF is used to simulate the dynamic formation and dissipation of clusters in a circulating fluidized bed riser. The agglomeration of particles reduces slip velocity within particle clusters, and hence results in two reverse trends: discrete particles are lifted by air while particle clusters fall down along the wall. The dynamic equilibrium of these two types of motion leads to the characteristic sigmoid profile of solid concentration along the longitudinal direction. The predicted solid velocity, lateral and longitudinal profiles of solid volume fraction and annulus thickness are in reasonable agreement with experimental results.
文摘Following the author's own experiencing in supervising Ph.D. theses in literature, languages, linguistics, and teacher education, the author will focus on new trends of advanced research projects that have been contributing to reinforce the importance of research in these areas in a time of crisis in the humanities. The organization and funding of science and scholarship in Europe has been promoting anything else but social sciences research, including educational areas. The author will follow the recent call from the Board of Trustees da Academia Europaea to redirect policies toward the organization of multidisciplinary research projects. Among these so-called "small subjects", we will find original, inspired, and valuable research projects in the humanities, It is worth mentioning that the crisis that has been diminishing this type of scholarship strangely cohabits with several policies promoted by the European Commission and the Council of Europe to develop programs for plurilingual education and linguistic diversity, new framework strategies for multilingualism, and the use of new technologies for language teaching and learning. A strong emphasis on research projects leading to interdisciplinary studies involving literature and pure sciences, plus the development of outreach research projects will be proposed.
基金Supported by the National Natural Science Foundation of China(61503384,61603393)Natural Science Foundation of Jiangsu(BK20150199,BK20160275)+1 种基金the Foundation Research Funds for the Central Universities(2015QNA65)the Postdoctoral Foundation of Jiangsu Province(1501081B)
文摘Although industrial processes often perform perfectly under design conditions, they may deviate from the optimal operating point owing to parameters drift, environmental disturbances, etc. Thus, it is necessary to develop efficacious strategies or procedure to assess the process performance online. In this paper, we explore the issue of operating optimality assessment for complex industrial processes based on performance-similarity considering nonlinearities and outliers simultaneously, and a general enforced online performance assessment framework is proposed. In the offline part, a new and modified total robust kernel projection to latent structures algorithm,T-KPRM, is proposed and used to evaluate the complex nonlinear industrial process, which can effectively extract the optimal-index-related process variation information from process data and establish assessment models for each performance grades overcoming the effects of outlier. In the online part, the online assessment results can be obtained by calculating the similarity between the online data from a sliding window and each of the performance grades. Furthermore, in order to improve the accuracy of online assessment, we propose an online assessment strategy taking account of the effects of noise and process uncertainties. The Euclidean distance between the sliding data window and the optimal evaluation level is employed to measure the contribution rates of variables, which indicate the possible reason for the non-optimal operating performance. The proposed framework is tested on a real industrial case: dense medium coal preparation process, and the results shows the efficiency of the proposed method comparing to the existing method.
文摘This research observed and evaluated the sustainability practices in universities. This study emphasizes the connection between theory and practice in research frame. It is intended by this research using content analysis of UI GreenMetric, universities' websites and sustainability annual reports observing universities' practices related to sustainability to answer the research question, which is: How are university managements embedding sustainability-oriented practices in sustainability focused European universities as far as CORE system (Curriculum, Operations, Research, and Engagement) is considered? The employed research methodology mainly relies on content analysis of the studied universities from the UI GreenMetric Sustainable University assessment and ranking index. The UI GreenMetric Sustainable University assessment and ranking index was selected since it considers the Operations, Curriculum, Research, and Engagements (CORE system) of universities with indicators such as Setting and Infrastructure, Energy and Climate Change, Waste, Water, Transportation, and Education. This covers the triple bottom line of sustainability (Environment, Economy, and Society) and other indexes like GASU, AASHE, STARS and others, focused mostly on operational Eco-efficiency. UI GreenMetric index is the first and the only ranking that measures each participating university's commitment in developing an "environmentally friendly" infrastructure. The total sample of the study observed and evaluated in this study are five (5) top European Sustainable Universities according to UI GreenMetric sustainable ranking index. The result shows a significant progress in Operational practices except in the area of Campus Setting and Infrastructure. There was a less significant progress in the Curriculum, Research, and Engagement practices of the CORE system of sustainability-oriented practices which are being integrated into the studied universities. This research provides a state of the art result regarding the embeddedness of sustainable practice in European universities. It has the potential to help any university to better integrate sustainability in their management system.
基金Project(2018YFB1307900)supported by the National Key R&D Program of ChinaProject(51775473)supported by the National Natural Science Foundation of China+3 种基金Projects(E2018203140,E2019203109)supported by the Natural Science Foundation of Hebei Province,ChinaProject(ZD2019020)supported by the Key Research Project in Higher Education Institutions of Hebei Province,ChinaProject(2017KSYS009)supported by the Key Laboratory of Robotics and Intelligent Equipment of Guangdong Regular Institutions of Higher Education,ChinaProject(KCYCXPT2017006)supported by the Innovation Center of Robotics and Intelligent Equipment of Dongguan University of Technology,China。
文摘The collision and wear caused by inevitable clearance in kinematic pair have an effect on the dynamic characteristics of the mechanism.Therefore,we established the dynamic model of a 3RSR(R is the revolute joint and S is the spherical joint)parallel mechanism with spherical joint clearance based on the modified Flores contact force model and the modified Coulomb friction model using Newton-Euler method.The standard quaternion was introduced in the constraint equation,and the four-order Runge-Kutta method was adopted to solve the 3RSR dynamic model.The simulation results were compared and analyzed with the numerical results.The geometrical parameters of the worn ball socket were solved based on the Archard wear model,and the geometrical reconstruction of the worn surface was carried out.The geometric reconstruction parameters were substituted into the dynamic model,which was to analyze the dynamic response of the 3RSR parallel mechanism with wear and spherical joint clearance.The simulation results show that the irregular wear occurs in the spherical joint with clearance under the presence of the impact and friction force.The long-term wear will increase the fluctuation of the contact force,thereby decreasing the movement stability of the mechanism.
文摘It is argued that it has not yet been able to value the historical, philosophical and epistemological travail, represented by the filth and fourth centuries BC of the ancient Greek world, which preceded the highest scientific heritage, represented by the so-called golden age of Euclid, Archimedes and Apollonius, Ⅲ-Ⅱ century BC. Well, it is believed that with our complex concept of tradition of thought within which we insert not only epistemological concepts but also philosophical principles, historical and social frameworks, in stasis or in strong movement, processed by us, it is possible better interpret that happy moment of scientific constructions of the third and second century BC, as a result of the valorization of the deep travail and serious battle that preceded it between the fourth and fifth century BC. It is investigated in particular in our paper the development of astronomical thought between the fifth and fourth centuries BC, in the ancient Greek thought, and at last a particular presumed criticism by Archimedes in his Sandreckoner to Aristarchus.
文摘The paper addresses the formulation of rate equations, via objective time derivatives, within continuum physics. The concept of objectivity is reviewed and distinction is made with material frame-indifference whose meaning is restricted to the invariance of the balance equations relative to Galilean frames. Objective time derivatives are defined to leave the tensor character of the appropriate field invariant within the set of Euclidean frames. Rate equations are required to involve objective time derivatives and to be consistent with the second law of thermodynamics. Here the general structure of objective time derivatives is established and the known derivatives of the physical literature are shown to be particular cases. Next, to fix ideas, a rate equation is considered for the model of heat conduction via a generalization of the Maxwell-Cattaneo equation with higher-order gradients as in the Guyer-Krumhansl equation. The thermodynamic restrictions are investigated and the expected effects, of the selected derivative of the heat flux, on the stress tensor are derived.
基金Supported by the National Natural Science Foundation of China(Nos. 60802089,40801176,40706060)the National High Technology Research and Development Program of China(863 Program)(No. 2007AA092102)
文摘Temporal and spatial patterns of inherent optical properties in the Bohai Sea are very complex. In this paper, we used 77 groups of field data of AOPs (apparent optical properties) and IOPs (inherent optical properties) collected in June, August, and September of 2005 in the Bohai Sea, to retrieve the spectral total absorption coefficient a(2) with the quasi-analytical algorithm (QAA). For QAA implementation, different bands in the region 680-730 nm (in 5 nm intervals) were selected and compared, to determine the optimal band domain of the reference wavelength. On this basis, we proposed a new algorithm (QAA-Com), a combination of QAA-685 and QAA-715, according to turbidity characterized by a(440). The percentage difference of model retrievals in the visible domain was between 4.5%-45.1%, in average of 18.8% for a(2). The QAA model was then applied to Medium Resolution Imaging Spectrometer (MERIS) radiometric products, which were temporally and spatially matched with in-situ optical measurements. Differences between MERIS retrievals and in-situ values were in the range 9.2%-27.8% for a(2) in the visible domain. Major errors in satellite retrieval are attributable to uncertainties of QAA model parameters and in-situ measurements, as well as imperfect atmospheric correction of MERIS data by the European Space Agency (ESA). During a storm surge in April 2009, time series of MERIS images together with the QAA model were used to analyze spatial and temporal variability of the total absorption coefficient pattern in the Bohai Sea. It is necessary to collect more independent field data to improve this algorithm.
文摘USA as an ICT (Information and Communication Technology) innovative leader, Europe with its knowledge offensive and Asia as the fastest growing economies share the common fate: ICT projects do under perform. Numerous surveys point at human factor as a source of this malheur. The question emerge to what extent project manager is responsible for improvements there, and which particular skills are demanded to turn the ICT projects course towards more predictable, more efficient and better budget able endeavours. Authors examined and compared the scientific and practitioners views. Twenty-nine journal and conference papers and 46 monographs and standards dedicated to project manager skills have been scrutinized. Further 324 jobs advertisements for the ICT project managers in USA, Switzerland, Poland and Thailand underwent an analysis related to the demanded soft skills of the project manager. The L-Timer~ taxonomy of human factor related processes in project management is applied as comparison vehicle. Methodology extracted main (global) terms and detailed aspects, both weighted appropriately. The practitioners on all continents expect primarily communication skills followed by the team management abilities. Human resource is partially treated, while conflict management is underrepresented. The science seems to be focused on leadership followed by the communication skills, neglecting self management skills of project managers. The last are surprisingly well represented in the US advertisement. The USA job advertisements are the most comprehensive and elaborated one--and, what might be explained by high impact of American science on job definition--close to the scientific details of skill description, self management excluded. In Poland, team management appears to be a problem, while Thailand's companies seek leaders first. The best balanced approach might be found in Swiss job advertisements. The inter-cultural differences point at impact of cultural heritage, which call for differentiated view of science on demanded project manager human factor related skills. Authors pursue this fascinating research.
文摘Based on my teaching and working experience in Europe, I have made a comparison between the Chinese and European patients in acupuncture treatment, and hope it is of some significance in acupuncture clinical practice.
文摘By the sketch of structure of MVWG,the working laws of this kind of gyroscope we re explained.To the aid of Euler′s Dynamics Equation,a mathematical model of the gyroscope was constructed,and then by the basic working laws of MVWG the model was simplified.Under the conditions of the three axial direction rotations and general rotation,the mathematical model was resolved.And finally by the solutions, the working laws of the gyroscope, the working disparity among all sorts of gyrations and the influences from the gyrations in the axial directions were analysed.
基金supported by the National Natural Science Foundation of China[grant number 42075050]。
文摘A machine-learning(ML)model,the light gradient boosting machine(LightGBM),was constructed to simulate the variation in the summer(June-July-August)heatwave frequency(HWF)over eastern Europe(HWFUR)and to analyze the contributions of various lower-boundary climate factors to the HWFUR variation.The examined lower-boundary climate factors were those that may contribute to the HWFUR variation—namely,the sea surface temperature,soil moisture,snow-cover extent,and sea-ice concentration from the simultaneous summer,preceding spring,and winter.These selected climate factors were significantly correlated to the summer HWFUR variation and were used to construct the ML model.Both the hindcast simulation of HWF EUR for the period 1981-2020 and its real-time simulation for the period 2011-2020,which used the constructed ML model,were investigated.To evaluate the contributions of the climate factors,various model experiments using different combinations of the climate factors were examined and compared.The results indicated that the LightGBM model had comparatively good performance in simulating the HWFUR variation.The sea surface temperature made more contributions to the ML model simulation than the other climate factors.Further examination showed that the best ML simulation was that which used the climate factors in the preceding winter,suggesting that the lower-boundary conditions in the preceding winter may be critical in forecasting the summer HWFUR variation.
文摘Data Envelopment Analysis (DEA) is a powerful mathematical optimization method widely used for measuring, evaluating and improving the performance of Decision Making Units (DMUs). These used in the various forms, such as hospitals, government agencies, educational institutions, air force, bank branches, business finns, sport teams and even people including the performance of countries, regions, etc. Recently DEA has been extended to examine the performance through the different sport types. In this paper, a Stochastic Input Oriented Data Envelopment Analysis (SIODEA) Model is conducted for measuring and evaluating the relative efficiency scores of football teams selected from different European countries during 2014/2015 season each with some of inputs are stochastic with normally distributed and recent inputs are deterministic and outputs, to shed light on the professional football teams performance.