针对一类广泛存在的生产装配问题,建立人机共同作业的资源约束U形装配线平衡问题(ResourceconstraintU-shaped assembly line balancing problem with man-robot cooperation,RCUALBP_MRC)模型。该模型中机器人与助理均为有限资源,机器...针对一类广泛存在的生产装配问题,建立人机共同作业的资源约束U形装配线平衡问题(ResourceconstraintU-shaped assembly line balancing problem with man-robot cooperation,RCUALBP_MRC)模型。该模型中机器人与助理均为有限资源,机器人可替代人工操作,助理可协助工人操作,优化目标为同时最小化总成本指标和最大化线效率以及负载标准差综合指标。一种用于求解RCUALBP_MRC的基于交叉熵(Cross-entropy,CE)方法与遗传算法(Geneticalgorithm,GA)的协同进化算法(CE-GACo-evolutionaryalgorithm,CE-GACEA)被提出。首先,根据问题特点,对解中工序子序列设计了一种基于工序选择因子的编码(Task selection factor based code,TSFBC)。其次,在算法的全局搜索阶段对解中工序子序列和机器人及助理子序列所确定的子空间,分别利用GA和CE的操作进行协同搜索,可丰富搜索方向并发现优质解区域;局部搜索阶段加入种群分裂-合并机制,可有效平衡算法的全局与局部搜索,改善算法性能。最后,通过在不同规模问题上的仿真试验和算法对比,验证所提CE-GACEA的有效性。展开更多
The uplift of the Qinghai-Tibet Plateau(TP)strongly influences climate change,both regionally and globally.Surface observation data from this region have limited coverage and are difficult to obtain.Consequently,the v...The uplift of the Qinghai-Tibet Plateau(TP)strongly influences climate change,both regionally and globally.Surface observation data from this region have limited coverage and are difficult to obtain.Consequently,the vertical crustal deformation velocity(VCDV)distribution of the TP is poorly constrained.In this study,the VCDV from the TP was inverted by using data from the gravity recovery and climate experiment(GRACE).We were able to obtain the vertical crustal movement by deducting the hydrological factors,based on the assumption that the gravity signal detected by GRACE is mainly composed of hydrological factors and vertical crustal movement.From the vertical crustal movement,we inverted the distribution of the VCDV across the TP.The results showed that the VCDV of the southern,eastern,and northern TP is~1.1 mm/a,~0.5 mm/a,and−0.1 mm/a,respectively,whereas that of the region between the Qilian Haiyuan Fault and the Kunlun Fault is~0.0 mm/a.These results are consistent with the distribution of crustal deformation,thrust earthquakes and faults,and regional lithospheric activity.The hydrology,crustal thickness,and topographic factors did not change the overall distribution of the VCDV across the TP.The influence of hydrological factors is marked,with the maximum differences being approximately−0.4 mm/a in the northwest and 1.0 mm/a in the central area.The results of this study are significant for understanding the kinematics of the TP.展开更多
The increasing demand for new energy sources has promoted the improvement of the energy storage capacity of lithium-ion batteries(LIBs)that urged the development of higher energy density cathode materials.The enhancem...The increasing demand for new energy sources has promoted the improvement of the energy storage capacity of lithium-ion batteries(LIBs)that urged the development of higher energy density cathode materials.The enhancement of the classical cathode in the last 30 years has reached a bottleneck,and then the discovery of the lithium-excess disordered materials has greatly expanded the research space of the cathode materials.Compared with the conventional layered oxides,the lithium-excess disordered rock-salt oxides(LEDRXs)with a more stable structure has higher extractable Li^(+)content,even though the inactive high-valent transition metals(TMs)were needed to compensate for the excess Li,which would reduce the total TM redox content.In addition,oxygen redox provides additional electron capacity for the materials,which also causes O loss and results in the subsequent poor cycle performance.Herein,a series of studies about LEDRXs and their targeted modification measures are summarized,including the prospect of the materials,in order to provide ideas for the design of highperformance LEDRXs.Finally,the new discoveries and outlook on future research directions of LEDRX cathode materials for LIBs with higher energy density are given.展开更多
A great deal of stabilized retained austenite can be obtained by means of austempering immediately after intercritical annealing in the low-carbon plain steel sheets which only contain alloying elements of silicon and...A great deal of stabilized retained austenite can be obtained by means of austempering immediately after intercritical annealing in the low-carbon plain steel sheets which only contain alloying elements of silicon and manganese. Transformation from retained austenite to martensite may be induced by strain at a temperature ranging from 50 ℃ to 400 ℃ during tension testing. Transformation-induced plasticity (TRIP) may occur. Alloying of silicon improves the stability of retained austenite. Mechanical properties of the present TRIP steels containing manganese increase with increasing silicon amount when the amount of silicon is less than two percent.展开更多
The molecular mechanism of Gastric cancer (GC) is gaining ground rapidly. Cytological study has identified the multiple changes of gene, to isolate GC associated genes, optimized arbitrarily primed polymerase chain re...The molecular mechanism of Gastric cancer (GC) is gaining ground rapidly. Cytological study has identified the multiple changes of gene, to isolate GC associated genes, optimized arbitrarily primed polymerase chain reaction (AP-PCR) is used in present study matching GC tissues and non-cancerous gastric tissues. The present study includes three parts: the first step is acquirement of the differential bands. The DNA is isolated from matched GC tissues and non-cancerous gastric tissues. DNA fingerprinting generated by using optimized APPCR. The second step is identification of the DNA. The DNA extracted from the differential bands are amplified and identified by dot blot hybridization,展开更多
The weak pre-edge features in the Mn K-edge X-ray absorption near-edge structure (XANES) spectrumof manganese monoxide (MnO) were investigated by comparing experimental data with dipolar and quadrupolarcross-section c...The weak pre-edge features in the Mn K-edge X-ray absorption near-edge structure (XANES) spectrumof manganese monoxide (MnO) were investigated by comparing experimental data with dipolar and quadrupolarcross-section calculations in the framework of multiple-scattering theory. We assign the first pre-edge feature to a di-rect quadrupolar transition from Is core state to 3d molecular orbitals of the central atom, e.g., the lowest in energy,due to the more effective attraction of the core hole. The second peak in this region arises unambiguously from thehybridization between p-orbitals of the central atom with higher-shell metal octahedral orbitals.展开更多
At present, gravity field and steady-state ocean circulation explorer（GOCE） gravity data are always used to compute regional gravity anomaly and geoid height. In this study, the latest GOCE gravity field model data...At present, gravity field and steady-state ocean circulation explorer（GOCE） gravity data are always used to compute regional gravity anomaly and geoid height. In this study, the latest GOCE gravity field model data（from Oct. 2009 to Jul. 2010） are used to compute the gravity gradient of China's Mainland according to a rigorous recursion formula（in all the six directions）. The results show that the numerical values of the gravity gradients are larger in the T rr direction than those in the other directions. They reflect the terrain characteristics in detail and correlate with the regional tectonics; however, in the T ql and T r l directions,the numerical values are relatively smaller and the gravity gradients in the T r l direction do not reflect the terrain characteristics in detail.展开更多
文摘针对一类广泛存在的生产装配问题,建立人机共同作业的资源约束U形装配线平衡问题(ResourceconstraintU-shaped assembly line balancing problem with man-robot cooperation,RCUALBP_MRC)模型。该模型中机器人与助理均为有限资源,机器人可替代人工操作,助理可协助工人操作,优化目标为同时最小化总成本指标和最大化线效率以及负载标准差综合指标。一种用于求解RCUALBP_MRC的基于交叉熵(Cross-entropy,CE)方法与遗传算法(Geneticalgorithm,GA)的协同进化算法(CE-GACo-evolutionaryalgorithm,CE-GACEA)被提出。首先,根据问题特点,对解中工序子序列设计了一种基于工序选择因子的编码(Task selection factor based code,TSFBC)。其次,在算法的全局搜索阶段对解中工序子序列和机器人及助理子序列所确定的子空间,分别利用GA和CE的操作进行协同搜索,可丰富搜索方向并发现优质解区域;局部搜索阶段加入种群分裂-合并机制,可有效平衡算法的全局与局部搜索,改善算法性能。最后,通过在不同规模问题上的仿真试验和算法对比,验证所提CE-GACEA的有效性。
基金This research was financially supported by the State Key Laboratory of Geodesy and Earth’s Dynamics(Grant No.SKLGED2022-5-2)the Innovation Academy for Precision Measurement Science and Technology,the National Natural Science Foundation of China(Grant Nos.41304013,41967038)+1 种基金the Natural Science Foundation of Guangdong Province(Grant No.2021A1515011487)the Guangdong University of Petrochemical Technology Talent Recruitment(No.520130).
文摘The uplift of the Qinghai-Tibet Plateau(TP)strongly influences climate change,both regionally and globally.Surface observation data from this region have limited coverage and are difficult to obtain.Consequently,the vertical crustal deformation velocity(VCDV)distribution of the TP is poorly constrained.In this study,the VCDV from the TP was inverted by using data from the gravity recovery and climate experiment(GRACE).We were able to obtain the vertical crustal movement by deducting the hydrological factors,based on the assumption that the gravity signal detected by GRACE is mainly composed of hydrological factors and vertical crustal movement.From the vertical crustal movement,we inverted the distribution of the VCDV across the TP.The results showed that the VCDV of the southern,eastern,and northern TP is~1.1 mm/a,~0.5 mm/a,and−0.1 mm/a,respectively,whereas that of the region between the Qilian Haiyuan Fault and the Kunlun Fault is~0.0 mm/a.These results are consistent with the distribution of crustal deformation,thrust earthquakes and faults,and regional lithospheric activity.The hydrology,crustal thickness,and topographic factors did not change the overall distribution of the VCDV across the TP.The influence of hydrological factors is marked,with the maximum differences being approximately−0.4 mm/a in the northwest and 1.0 mm/a in the central area.The results of this study are significant for understanding the kinematics of the TP.
基金financially supported by the National Natural Science Foundation of China(Nos.22179022,22109023 and 22179021)the Industry-University-Research Joint Innovation Project of Fujian Province(No.2021H6006)+3 种基金the Award Program for Fujian Minjiang Scholar Professorshipthe Talent Fund Program of Fujian Normal Universitythe support from the NSERC Discovery Grant(NSERC RGPIN-2020-04463)McGill Start-Up Grant.
文摘The increasing demand for new energy sources has promoted the improvement of the energy storage capacity of lithium-ion batteries(LIBs)that urged the development of higher energy density cathode materials.The enhancement of the classical cathode in the last 30 years has reached a bottleneck,and then the discovery of the lithium-excess disordered materials has greatly expanded the research space of the cathode materials.Compared with the conventional layered oxides,the lithium-excess disordered rock-salt oxides(LEDRXs)with a more stable structure has higher extractable Li^(+)content,even though the inactive high-valent transition metals(TMs)were needed to compensate for the excess Li,which would reduce the total TM redox content.In addition,oxygen redox provides additional electron capacity for the materials,which also causes O loss and results in the subsequent poor cycle performance.Herein,a series of studies about LEDRXs and their targeted modification measures are summarized,including the prospect of the materials,in order to provide ideas for the design of highperformance LEDRXs.Finally,the new discoveries and outlook on future research directions of LEDRX cathode materials for LIBs with higher energy density are given.
文摘A great deal of stabilized retained austenite can be obtained by means of austempering immediately after intercritical annealing in the low-carbon plain steel sheets which only contain alloying elements of silicon and manganese. Transformation from retained austenite to martensite may be induced by strain at a temperature ranging from 50 ℃ to 400 ℃ during tension testing. Transformation-induced plasticity (TRIP) may occur. Alloying of silicon improves the stability of retained austenite. Mechanical properties of the present TRIP steels containing manganese increase with increasing silicon amount when the amount of silicon is less than two percent.
文摘The molecular mechanism of Gastric cancer (GC) is gaining ground rapidly. Cytological study has identified the multiple changes of gene, to isolate GC associated genes, optimized arbitrarily primed polymerase chain reaction (AP-PCR) is used in present study matching GC tissues and non-cancerous gastric tissues. The present study includes three parts: the first step is acquirement of the differential bands. The DNA is isolated from matched GC tissues and non-cancerous gastric tissues. DNA fingerprinting generated by using optimized APPCR. The second step is identification of the DNA. The DNA extracted from the differential bands are amplified and identified by dot blot hybridization,
基金One of the authors(WU Zi-Yu)acknowledges the financial support of the 100-Talent Research Program of the Chinese Academy of Sciences and of the Outstanding Youth Fund(10125523)the Key Important Nano-Research Project(90206032)of the National Natural Science Founda tion of China.
文摘The weak pre-edge features in the Mn K-edge X-ray absorption near-edge structure (XANES) spectrumof manganese monoxide (MnO) were investigated by comparing experimental data with dipolar and quadrupolarcross-section calculations in the framework of multiple-scattering theory. We assign the first pre-edge feature to a di-rect quadrupolar transition from Is core state to 3d molecular orbitals of the central atom, e.g., the lowest in energy,due to the more effective attraction of the core hole. The second peak in this region arises unambiguously from thehybridization between p-orbitals of the central atom with higher-shell metal octahedral orbitals.
基金supported by Key Projects of Henan Province Department of Education Science and Technology(14B420001)
文摘At present, gravity field and steady-state ocean circulation explorer（GOCE） gravity data are always used to compute regional gravity anomaly and geoid height. In this study, the latest GOCE gravity field model data（from Oct. 2009 to Jul. 2010） are used to compute the gravity gradient of China's Mainland according to a rigorous recursion formula（in all the six directions）. The results show that the numerical values of the gravity gradients are larger in the T rr direction than those in the other directions. They reflect the terrain characteristics in detail and correlate with the regional tectonics; however, in the T ql and T r l directions,the numerical values are relatively smaller and the gravity gradients in the T r l direction do not reflect the terrain characteristics in detail.
