In this work,we construct two efficient fully decoupled,linear,unconditionally stable numerical algorithms for the thermally coupled incompressible magnetohydrodynamic equations.Firstly,in order to obtain the desired ...In this work,we construct two efficient fully decoupled,linear,unconditionally stable numerical algorithms for the thermally coupled incompressible magnetohydrodynamic equations.Firstly,in order to obtain the desired algorithm,we introduce a scalar auxiliary variable(SAV)to get a new equivalent system.Secondly,by combining the pressure-correction method and the explicit-implicit method,we perform semi-discrete numerical algorithms of first and second order,respectively.Then,we prove that the obtained algorithms follow an unconditionally stable law in energy,and we provide a detailed implementation process,which we only need to solve a series of linear differential equations with constant coefficients at each time step.More importantly,with some powerful analysis,we give the order of convergence of the errors.Finally,to illustrate theoretical results,some numerical experiments are given.展开更多
为了探究我国在禽流感防控研究方面的现状和趋势,挖掘研究热点,基于Web of Science数据库和incoPat数据库,从文献计量视角通过3个分析维度(影响分析、主题分析、知识扩散分析)对我国禽流感病毒防控研究态势及热点进行分析。选取1个国内...为了探究我国在禽流感防控研究方面的现状和趋势,挖掘研究热点,基于Web of Science数据库和incoPat数据库,从文献计量视角通过3个分析维度(影响分析、主题分析、知识扩散分析)对我国禽流感病毒防控研究态势及热点进行分析。选取1个国内OIE禽流感参考实验室以及3个与OIE禽流感参考实验室中类似规模、相似学科的国际顶尖科研团队作为对标团队,通过定标比超分析揭示我国禽流感防控研究态势及热点。结果表明:(1)在影响分析维度,我国的禽流感防控研究整体上已列入国际前列,相关高水平研究内容具备一定领域前沿性。我国高被引论文数量较多,在论文增长率上有优势;专利被引频次表现优异,但专利强度表现不足;(2)在主题分析维度,我国主要研究与研发热点涉及"诊"和"防"两类。研究内容主要围绕结合基因编辑技术、分子流行病学等研究禽流感病毒性状、传播发病机制等研究内容;研发内容主要围绕动物流感制剂制作、疫苗株研发制备、蛋白芯片制备检测等技术有研发;(3)在知识扩散分析维度,我国在禽流感流行病学及传播机制方面的研究对H5和H7相关病原学等有一定引领性。在疫苗研制方面,我国的H7亚型疫苗相关研究有一定引领性。展开更多
A new version of particle swarm optimization(PSO) called discontinuous flying particle swarm optimization(DFPSO) was proposed,where not all of the particles refreshed their positions and velocities during each iterati...A new version of particle swarm optimization(PSO) called discontinuous flying particle swarm optimization(DFPSO) was proposed,where not all of the particles refreshed their positions and velocities during each iteration step and the probability of each particle in refreshing its position and velocity was dependent on its objective function value.The effect of population size on the results was investigated.The results obtained by DFPSO have an average difference of 6% compared with those by PSO,whereas DFPSO consumes much less evaluations of objective function than PSO does.展开更多
In the reliability analysis of slope, the performance functions derived from the most available stability analysis procedures of slopes are usually implicit and cannot be solved by first-order second-moment approach. ...In the reliability analysis of slope, the performance functions derived from the most available stability analysis procedures of slopes are usually implicit and cannot be solved by first-order second-moment approach. A new reliability analysis approach was presented based on three-dimensional Morgenstem-Price method to investigate three-dimensional effect of landslide in stability analyses. To obtain the reliability index, Support Vector Machine （SVM） was applied to approximate the performance function. The time-consuming of this approach is only 0.028% of that using Monte-Carlo method at the same computation accuracy. Also, the influence of time effect of shearing strength parameters of slope soils on the long-term reliability of three-dimensional slopes was investigated by this new approach. It is found that the reliability index of the slope would decrease by 52.54% and the failure probability would increase from 0.000 705% to 1.966%. In the end, the impact of variation coefficients of c andfon reliability index of slopes was taken into discussion and the changing trend was observed.展开更多
基金Supported by Research Project Supported by Shanxi Scholarship Council of China(2021-029)Shanxi Provincial International Cooperation Base and Platform Project(202104041101019)Shanxi Province Natural Science Foundation(202203021211129)。
文摘In this work,we construct two efficient fully decoupled,linear,unconditionally stable numerical algorithms for the thermally coupled incompressible magnetohydrodynamic equations.Firstly,in order to obtain the desired algorithm,we introduce a scalar auxiliary variable(SAV)to get a new equivalent system.Secondly,by combining the pressure-correction method and the explicit-implicit method,we perform semi-discrete numerical algorithms of first and second order,respectively.Then,we prove that the obtained algorithms follow an unconditionally stable law in energy,and we provide a detailed implementation process,which we only need to solve a series of linear differential equations with constant coefficients at each time step.More importantly,with some powerful analysis,we give the order of convergence of the errors.Finally,to illustrate theoretical results,some numerical experiments are given.
文摘为了探究我国在禽流感防控研究方面的现状和趋势,挖掘研究热点,基于Web of Science数据库和incoPat数据库,从文献计量视角通过3个分析维度(影响分析、主题分析、知识扩散分析)对我国禽流感病毒防控研究态势及热点进行分析。选取1个国内OIE禽流感参考实验室以及3个与OIE禽流感参考实验室中类似规模、相似学科的国际顶尖科研团队作为对标团队,通过定标比超分析揭示我国禽流感防控研究态势及热点。结果表明:(1)在影响分析维度,我国的禽流感防控研究整体上已列入国际前列,相关高水平研究内容具备一定领域前沿性。我国高被引论文数量较多,在论文增长率上有优势;专利被引频次表现优异,但专利强度表现不足;(2)在主题分析维度,我国主要研究与研发热点涉及"诊"和"防"两类。研究内容主要围绕结合基因编辑技术、分子流行病学等研究禽流感病毒性状、传播发病机制等研究内容;研发内容主要围绕动物流感制剂制作、疫苗株研发制备、蛋白芯片制备检测等技术有研发;(3)在知识扩散分析维度,我国在禽流感流行病学及传播机制方面的研究对H5和H7相关病原学等有一定引领性。在疫苗研制方面,我国的H7亚型疫苗相关研究有一定引领性。
基金Project(50874064) supported by the National Natural Science Foundation of ChinaKey Project(Z2007F10) supported by the Natural Science Foundation of Shandong Province,China
文摘A new version of particle swarm optimization(PSO) called discontinuous flying particle swarm optimization(DFPSO) was proposed,where not all of the particles refreshed their positions and velocities during each iteration step and the probability of each particle in refreshing its position and velocity was dependent on its objective function value.The effect of population size on the results was investigated.The results obtained by DFPSO have an average difference of 6% compared with those by PSO,whereas DFPSO consumes much less evaluations of objective function than PSO does.
基金Project(50878082) supported by the National Natural Science Foundation of ChinaProject(200631880237) supported by the Science and Technology Program of West Transportation of the Ministry of Transportation of ChinaKey Project(09JJ3104) supported by the Natural Science Foundation of Hunan Province, China
文摘In the reliability analysis of slope, the performance functions derived from the most available stability analysis procedures of slopes are usually implicit and cannot be solved by first-order second-moment approach. A new reliability analysis approach was presented based on three-dimensional Morgenstem-Price method to investigate three-dimensional effect of landslide in stability analyses. To obtain the reliability index, Support Vector Machine （SVM） was applied to approximate the performance function. The time-consuming of this approach is only 0.028% of that using Monte-Carlo method at the same computation accuracy. Also, the influence of time effect of shearing strength parameters of slope soils on the long-term reliability of three-dimensional slopes was investigated by this new approach. It is found that the reliability index of the slope would decrease by 52.54% and the failure probability would increase from 0.000 705% to 1.966%. In the end, the impact of variation coefficients of c andfon reliability index of slopes was taken into discussion and the changing trend was observed.
