According to the orthotropy of Ti sheet anisotropy and the character that a extreme value of some mechanical properties forTi sheet appears at angles between 0°and 90° with rolling direction,a mathematical m...According to the orthotropy of Ti sheet anisotropy and the character that a extreme value of some mechanical properties forTi sheet appears at angles between 0°and 90° with rolling direction,a mathematical model describing the anisotropy of me-chanical properties for Ti sheet under simple tension has been proposed in this paper.A comparison between the calculated valueand the experimental data for several kinds of Ti sheets shows that deviations are less than 3%.展开更多
The similarity and difference between the bond orientational order and pair analysis methods have been first identified with the help of molecular dynamics simulation and the steepest descent minimization of potential...The similarity and difference between the bond orientational order and pair analysis methods have been first identified with the help of molecular dynamics simulation and the steepest descent minimization of potentials techniques. The binary liquid K-Rb alloys are chosen as an example.Results show that the bond orientational order parameters may be a relevant direct measurement on the perfection of an icosahedron. The PA formula (1551 bonded pairs) is, however, responsible for the total number of various icosahedra. In addition, it is found that pair analysis approach is more sensible to local structure than that for bond orientational order.展开更多
Instructions:Use the letters after the clues(information that helps you to find the answers)below to make words used to describe people.Then use the letters in the yellow boxes to make another word that describes some...Instructions:Use the letters after the clues(information that helps you to find the answers)below to make words used to describe people.Then use the letters in the yellow boxes to make another word that describes someone.展开更多
Both, the dilemma to find a quantum field theory consistent with Einstein’s law of relativity and the problem to describe existing particles as bound states of matter has been solved by calculating bound state matrix...Both, the dilemma to find a quantum field theory consistent with Einstein’s law of relativity and the problem to describe existing particles as bound states of matter has been solved by calculating bound state matrix elements from a dual fermion-boson Lagrangian. In this formalism, the fermion binding energies are compensated by boson energies, indicating that particles can be generated out of the vacuum. This yields quantitative solutions for various mesons ω (0.78 GeV) - Υ (9.46 GeV) and all leptons e, μ and τ, with uncertainties in the extracted properties of less than 1‰. For transparency, a Web-page with the address htpps://h2909473.stratoserver.net has been constructed, where all calculations can be run on line and also the underlying fortran source code can be inspected.展开更多
The COVID-19 pandemic has posed a serious threat to global mental health.Multiple lines of evidence suggest that there is a varying yet considerable increase in mental health issues among the general population and vu...The COVID-19 pandemic has posed a serious threat to global mental health.Multiple lines of evidence suggest that there is a varying yet considerable increase in mental health issues among the general population and vulnerable groups.12 The aftermath is obscure and speculative from a social,economic,individual and public mental health perspective.Recently published studies support the existence of an emotional epidemic curve,describing a high probability of an increase in the burden of mental health issues in the post-pandemic era.34 Furthermore,previous major public health emergencies showed that more than half of the population devel-oped mental health problems and required mental health intervention.45 There is,therefore,an urgent need to reorganise existing mental health services to address the current unmet needs for mental health and to prepare for future challenges in the postpandemic era in terms of prevention and management.展开更多
A review concerning the methods of studying and describing wave groups is presented in this paper. After analysing 78 field records collected in the Shijiu Port, China, the measured parameters of wave groups and some ...A review concerning the methods of studying and describing wave groups is presented in this paper. After analysing 78 field records collected in the Shijiu Port, China, the measured parameters of wave groups and some factors describing wave groupness and their variations are given. Moreover, these results are compared with those of theory.展开更多
According to the observation in experiment of stability of the oil film, the assumption of velocity distribution for both the water flow and the oil film is introduced. On the basis of the assumption, Orr-Sommerfeld s...According to the observation in experiment of stability of the oil film, the assumption of velocity distribution for both the water flow and the oil film is introduced. On the basis of the assumption, Orr-Sommerfeld stability equation is applied to develop the method of determining the critical velocity of the oil film, and the criterion for stability of the oil film is obtained. Meanwhile, a formula describing the relation between the thickness of the oil film and the velocity of the water flow is also given and examined by the laboratory experiment.展开更多
In this paper, on the basis of the heat conduction equation without consideration of the advection and turbulence effects, one-dimensional model for describing surface sea temperature ( T1), bottom sea temperature ( T...In this paper, on the basis of the heat conduction equation without consideration of the advection and turbulence effects, one-dimensional model for describing surface sea temperature ( T1), bottom sea temperature ( Tt ) and the thickness of the upper homogeneous layer ( h ) is developed in terms of the dimensionless temperature θT and depth η and self-simulation function θT - f(η) of vertical temperature profile by means of historical temperature data.The results of trial prediction with our one-dimensional model on T, Th, h , the thickness and gradient of thermocline are satisfactory to some extent.展开更多
A robust controller method for flexible joint robot considering the effect caused by nonlinear friction was presented.The nonlinear friction was denoted as inverse additive output uncertainty relative to the nominal m...A robust controller method for flexible joint robot considering the effect caused by nonlinear friction was presented.The nonlinear friction was denoted as inverse additive output uncertainty relative to the nominal model in our work,based on which the describing function was analyzed in frequency domain,and the weighting function of nonlinear friction was further calculated as well. By combining the friction uncertainty,the mixed sensitivity H∞optimization was proposed as the benchmark for controller design, which also leaded to good performance of robustness. Furthermore,unstructured perturbation to the system was analyzed so that the stability was guaranteed. Simulation results show that the proposed controller can provide excellent tracking and regulation performance.展开更多
Based on the phase diagram of the Fe-Pr system available,the thermodynamic optimization and calcula-tion of the system have been carried out by the least square method.The lattice stabilities of Fe and Pr aredescribed...Based on the phase diagram of the Fe-Pr system available,the thermodynamic optimization and calcula-tion of the system have been carried out by the least square method.The lattice stabilities of Fe and Pr aredescribed by the expression recommended by SGTE organization.The liquid phase is described by thesubregular solution model.The intermetallic compounds,Fe<sub>17</sub>Pr<sub>2</sub> and Fe<sub>2</sub>Pr,are treated as stoichiometriccompounds.The optimized parameters describing phases in the system are presented.The comparision be-tween the calculated and experimentally determined phase diagram shows that the agreement is generally verygood except for the liquid+δ-Fe equilibrium.It is suggested to measure this part of phase diagram again.展开更多
This paper mainly deals with the point groups and single forms of octagonal quasicrystals and the description of one-dimensional quasilattice. The authors present a new sequence for describing the arrangement of quasi...This paper mainly deals with the point groups and single forms of octagonal quasicrystals and the description of one-dimensional quasilattice. The authors present a new sequence for describing the arrangement of quasiperiods in one-dimensional quasilattice. The first ten numbers of quasiperiods of this sequence are 1, 1, 2, 5, 12, 29, 70, 169, 408 and 985. The arrangement of quasiperiods in the first five steps are a, b, ab. babab and babababbabab. Seven p(?)nt groups and nine single forms for the octagonal system have been deduced, They are as follows: Point groups: 8.8m, 82, 8/m, 8/mmm, 8 and 82m; single forms: octagonal prism, dioctagonal prism. octagonal pyramid. dioctagonal pyramid. octagonal dipyramid, dioctagonal dipyramid, octagonal scalenohedron, dioctagonal scalenohedron and octagonal trapezohedron. Besides seven point groups and nine single forms for the dodecahegonal system have also been deduced.展开更多
A one-dimentional three-layer model for the thermal structure in the Huanghai Sea is presented in this study, me model consists of the upper mixed layer caused by heating and wind mixing, the lower mixed layer driven ...A one-dimentional three-layer model for the thermal structure in the Huanghai Sea is presented in this study, me model consists of the upper mixed layer caused by heating and wind mixing, the lower mixed layer driven by tidal mixing, and the thermocline with certain thickness. The entrainment velocities of the upper and lower layers are obtained respectively. The results show that the model is capable of describing the development and decline processes of the seasonal thermocline in the Huanghai Sea, simulating successfully the Huanghai Sea Cold Water Mass, the nearshore front and surface cold water off North Jiangsu and explaining reasonably their formation mechanisms as well as the strong thermocline off Qingdao. It is suggested that the tidal mixing plays key role in the formation of the nearshore front off North Jiangsu and the strong thermocline off Qingdao. The wind mixing and the tidal mixing make the lower layer water with high nutrients go up to the upper layer. This physical process may be展开更多
In this paper, both direct method and its application to wave-wave striking interaction are introduced by illustrating Schrodinger equation describing the amplitude evalution of some mesoscale systems.
Biomedical and Environmental Sciences. an international journal with special emphasis on scientific findings in China.publishes articles dealing with biologic and toxic effects of environmental pollutants on man and o...Biomedical and Environmental Sciences. an international journal with special emphasis on scientific findings in China.publishes articles dealing with biologic and toxic effects of environmental pollutants on man and other forms of life. The effects may be measured with pharmacological, biochemical, pathological, and immunological techniques. The journal also publishes reports dealing with the entry. transport. and fate of natural and anthropogenic chemicals in the biosphere, and their impact on human health and well-being. Papers describing biochemical, pharmacological. pathological, and immunological studies of Pharmaceuticals that might facilitate the interpretation of toxic effects of environmental pollutants are also welcome.展开更多
Biomedical and Environmental Sciences,an international journal with emphasis on scientific findings in China,publishes articles dealing with biologic and toxic effects of environmental pollutants on man and other form...Biomedical and Environmental Sciences,an international journal with emphasis on scientific findings in China,publishes articles dealing with biologic and toxic effects of environmental pollutants on man and other forms of life. The effects may be measured with展开更多
INFORMATION FOR AUTHORS Biomedical and Environmental Sciences, an international journal with special emphasis on scientific findings in China, publishes articles dealing with biologic and toxic effects of environmenta...INFORMATION FOR AUTHORS Biomedical and Environmental Sciences, an international journal with special emphasis on scientific findings in China, publishes articles dealing with biologic and toxic effects of environmental pollutants on man and other forms oflife. The effects may be measured with pharmacological, biochemical. pathological, and immunological techniques. The journal also publishes reports dealing with the entry, transport, and fate of natural and anthropogenic chemicals in the biosphere, and their impact on human health and well-being. Papers describing biochemical, pharmacological, pathological, and immunological studies展开更多
Biomedical and Environmental Sciences, an international journal with special emphasis on scientific findings in China, publishes articles dealing with biologic and toxic effects of environmental pollutants on man and ...Biomedical and Environmental Sciences, an international journal with special emphasis on scientific findings in China, publishes articles dealing with biologic and toxic effects of environmental pollutants on man and other forms of life. The effects may be measured with pharmacological, biochemical. pathological, and immunological techniques. The journal also publishes reports dealing with the entry, transport. and fate of natural and anthropogenic chemicals in the biosphere, and their impact on human health and well-being. Papers describing biochemical, pharmacological, pathological, and immunological studies展开更多
Biomedical and Environmental Sciences,an international journal with special emphasis on scientificfindings in China,publishes articles dealing with biologic and toxic effects of environmental pollutants onman and othe...Biomedical and Environmental Sciences,an international journal with special emphasis on scientificfindings in China,publishes articles dealing with biologic and toxic effects of environmental pollutants onman and other forms of life.The effects may be measured with pharmacological,biochemical,pathological,and immunological techniques.The journal also publishes reports dealing with the entry,transport,andfate of natural and anthropogenic chemicals in the biosphere,and their impact on human health andwell-being.Papers describing biochemical,pharmacological,pathological,and immunological studies ofpharmaceuticals that might facilitate the interpretation of toxic effects of environmental pollutants are alsowelcome.展开更多
At present, the myopia illness of the students (including the students of university, middle schools andprimary schools) is a serious problem. For preventing and curing it, we must search for the developing lowsof myo...At present, the myopia illness of the students (including the students of university, middle schools andprimary schools) is a serious problem. For preventing and curing it, we must search for the developing lowsof myopia illness to provide the theory foundation for researches on and preventions from myopia illness.We provide the mathematial model on describing the poor eyesight of the students after analysing thedeveloping lows of the poor eyesight of the students as follows:where p(r,t) is the student’s myopia falling ill rate function at time t and age r, u(r) denotes the initial stagemyopia falling ill rate function and v(t), the baby myopia falling ill rate function. It is a first order quasi-展开更多
文摘According to the orthotropy of Ti sheet anisotropy and the character that a extreme value of some mechanical properties forTi sheet appears at angles between 0°and 90° with rolling direction,a mathematical model describing the anisotropy of me-chanical properties for Ti sheet under simple tension has been proposed in this paper.A comparison between the calculated valueand the experimental data for several kinds of Ti sheets shows that deviations are less than 3%.
文摘The similarity and difference between the bond orientational order and pair analysis methods have been first identified with the help of molecular dynamics simulation and the steepest descent minimization of potentials techniques. The binary liquid K-Rb alloys are chosen as an example.Results show that the bond orientational order parameters may be a relevant direct measurement on the perfection of an icosahedron. The PA formula (1551 bonded pairs) is, however, responsible for the total number of various icosahedra. In addition, it is found that pair analysis approach is more sensible to local structure than that for bond orientational order.
文摘Instructions:Use the letters after the clues(information that helps you to find the answers)below to make words used to describe people.Then use the letters in the yellow boxes to make another word that describes someone.
文摘Both, the dilemma to find a quantum field theory consistent with Einstein’s law of relativity and the problem to describe existing particles as bound states of matter has been solved by calculating bound state matrix elements from a dual fermion-boson Lagrangian. In this formalism, the fermion binding energies are compensated by boson energies, indicating that particles can be generated out of the vacuum. This yields quantitative solutions for various mesons ω (0.78 GeV) - Υ (9.46 GeV) and all leptons e, μ and τ, with uncertainties in the extracted properties of less than 1‰. For transparency, a Web-page with the address htpps://h2909473.stratoserver.net has been constructed, where all calculations can be run on line and also the underlying fortran source code can be inspected.
文摘The COVID-19 pandemic has posed a serious threat to global mental health.Multiple lines of evidence suggest that there is a varying yet considerable increase in mental health issues among the general population and vulnerable groups.12 The aftermath is obscure and speculative from a social,economic,individual and public mental health perspective.Recently published studies support the existence of an emotional epidemic curve,describing a high probability of an increase in the burden of mental health issues in the post-pandemic era.34 Furthermore,previous major public health emergencies showed that more than half of the population devel-oped mental health problems and required mental health intervention.45 There is,therefore,an urgent need to reorganise existing mental health services to address the current unmet needs for mental health and to prepare for future challenges in the postpandemic era in terms of prevention and management.
文摘A review concerning the methods of studying and describing wave groups is presented in this paper. After analysing 78 field records collected in the Shijiu Port, China, the measured parameters of wave groups and some factors describing wave groupness and their variations are given. Moreover, these results are compared with those of theory.
文摘According to the observation in experiment of stability of the oil film, the assumption of velocity distribution for both the water flow and the oil film is introduced. On the basis of the assumption, Orr-Sommerfeld stability equation is applied to develop the method of determining the critical velocity of the oil film, and the criterion for stability of the oil film is obtained. Meanwhile, a formula describing the relation between the thickness of the oil film and the velocity of the water flow is also given and examined by the laboratory experiment.
文摘In this paper, on the basis of the heat conduction equation without consideration of the advection and turbulence effects, one-dimensional model for describing surface sea temperature ( T1), bottom sea temperature ( Tt ) and the thickness of the upper homogeneous layer ( h ) is developed in terms of the dimensionless temperature θT and depth η and self-simulation function θT - f(η) of vertical temperature profile by means of historical temperature data.The results of trial prediction with our one-dimensional model on T, Th, h , the thickness and gradient of thermocline are satisfactory to some extent.
基金National Natural Science Foundation of China(No.61273339)
文摘A robust controller method for flexible joint robot considering the effect caused by nonlinear friction was presented.The nonlinear friction was denoted as inverse additive output uncertainty relative to the nominal model in our work,based on which the describing function was analyzed in frequency domain,and the weighting function of nonlinear friction was further calculated as well. By combining the friction uncertainty,the mixed sensitivity H∞optimization was proposed as the benchmark for controller design, which also leaded to good performance of robustness. Furthermore,unstructured perturbation to the system was analyzed so that the stability was guaranteed. Simulation results show that the proposed controller can provide excellent tracking and regulation performance.
文摘Based on the phase diagram of the Fe-Pr system available,the thermodynamic optimization and calcula-tion of the system have been carried out by the least square method.The lattice stabilities of Fe and Pr aredescribed by the expression recommended by SGTE organization.The liquid phase is described by thesubregular solution model.The intermetallic compounds,Fe<sub>17</sub>Pr<sub>2</sub> and Fe<sub>2</sub>Pr,are treated as stoichiometriccompounds.The optimized parameters describing phases in the system are presented.The comparision be-tween the calculated and experimentally determined phase diagram shows that the agreement is generally verygood except for the liquid+δ-Fe equilibrium.It is suggested to measure this part of phase diagram again.
文摘This paper mainly deals with the point groups and single forms of octagonal quasicrystals and the description of one-dimensional quasilattice. The authors present a new sequence for describing the arrangement of quasiperiods in one-dimensional quasilattice. The first ten numbers of quasiperiods of this sequence are 1, 1, 2, 5, 12, 29, 70, 169, 408 and 985. The arrangement of quasiperiods in the first five steps are a, b, ab. babab and babababbabab. Seven p(?)nt groups and nine single forms for the octagonal system have been deduced, They are as follows: Point groups: 8.8m, 82, 8/m, 8/mmm, 8 and 82m; single forms: octagonal prism, dioctagonal prism. octagonal pyramid. dioctagonal pyramid. octagonal dipyramid, dioctagonal dipyramid, octagonal scalenohedron, dioctagonal scalenohedron and octagonal trapezohedron. Besides seven point groups and nine single forms for the dodecahegonal system have also been deduced.
文摘A one-dimentional three-layer model for the thermal structure in the Huanghai Sea is presented in this study, me model consists of the upper mixed layer caused by heating and wind mixing, the lower mixed layer driven by tidal mixing, and the thermocline with certain thickness. The entrainment velocities of the upper and lower layers are obtained respectively. The results show that the model is capable of describing the development and decline processes of the seasonal thermocline in the Huanghai Sea, simulating successfully the Huanghai Sea Cold Water Mass, the nearshore front and surface cold water off North Jiangsu and explaining reasonably their formation mechanisms as well as the strong thermocline off Qingdao. It is suggested that the tidal mixing plays key role in the formation of the nearshore front off North Jiangsu and the strong thermocline off Qingdao. The wind mixing and the tidal mixing make the lower layer water with high nutrients go up to the upper layer. This physical process may be
文摘In this paper, both direct method and its application to wave-wave striking interaction are introduced by illustrating Schrodinger equation describing the amplitude evalution of some mesoscale systems.
文摘Biomedical and Environmental Sciences. an international journal with special emphasis on scientific findings in China.publishes articles dealing with biologic and toxic effects of environmental pollutants on man and other forms of life. The effects may be measured with pharmacological, biochemical, pathological, and immunological techniques. The journal also publishes reports dealing with the entry. transport. and fate of natural and anthropogenic chemicals in the biosphere, and their impact on human health and well-being. Papers describing biochemical, pharmacological. pathological, and immunological studies of Pharmaceuticals that might facilitate the interpretation of toxic effects of environmental pollutants are also welcome.
文摘Biomedical and Environmental Sciences,an international journal with emphasis on scientific findings in China,publishes articles dealing with biologic and toxic effects of environmental pollutants on man and other forms of life. The effects may be measured with
文摘INFORMATION FOR AUTHORS Biomedical and Environmental Sciences, an international journal with special emphasis on scientific findings in China, publishes articles dealing with biologic and toxic effects of environmental pollutants on man and other forms oflife. The effects may be measured with pharmacological, biochemical. pathological, and immunological techniques. The journal also publishes reports dealing with the entry, transport, and fate of natural and anthropogenic chemicals in the biosphere, and their impact on human health and well-being. Papers describing biochemical, pharmacological, pathological, and immunological studies
文摘Biomedical and Environmental Sciences, an international journal with special emphasis on scientific findings in China, publishes articles dealing with biologic and toxic effects of environmental pollutants on man and other forms of life. The effects may be measured with pharmacological, biochemical. pathological, and immunological techniques. The journal also publishes reports dealing with the entry, transport. and fate of natural and anthropogenic chemicals in the biosphere, and their impact on human health and well-being. Papers describing biochemical, pharmacological, pathological, and immunological studies
文摘Biomedical and Environmental Sciences,an international journal with special emphasis on scientificfindings in China,publishes articles dealing with biologic and toxic effects of environmental pollutants onman and other forms of life.The effects may be measured with pharmacological,biochemical,pathological,and immunological techniques.The journal also publishes reports dealing with the entry,transport,andfate of natural and anthropogenic chemicals in the biosphere,and their impact on human health andwell-being.Papers describing biochemical,pharmacological,pathological,and immunological studies ofpharmaceuticals that might facilitate the interpretation of toxic effects of environmental pollutants are alsowelcome.
文摘At present, the myopia illness of the students (including the students of university, middle schools andprimary schools) is a serious problem. For preventing and curing it, we must search for the developing lowsof myopia illness to provide the theory foundation for researches on and preventions from myopia illness.We provide the mathematial model on describing the poor eyesight of the students after analysing thedeveloping lows of the poor eyesight of the students as follows:where p(r,t) is the student’s myopia falling ill rate function at time t and age r, u(r) denotes the initial stagemyopia falling ill rate function and v(t), the baby myopia falling ill rate function. It is a first order quasi-
