The grain refinement mechanism and texture evolution of electromagnetically formed polycrystalline Cu sheets were investigated using the electron back-scattered diffraction(EBSD) technique. It is found that the averag...The grain refinement mechanism and texture evolution of electromagnetically formed polycrystalline Cu sheets were investigated using the electron back-scattered diffraction(EBSD) technique. It is found that the average grain size decreases from 35.88 μm to 8.77 μm. The grain refinement was mainly attributed to dynamic recrystallization(DRX) at the grain boundary regions of bulged Cu samples where the inhomogeneous dislocation density and the large lattice misorientation were observed. The DRX mechanisms at the grain boundaries were discussed with respect to the strain-induced grain boundary migration nucleation. Moreover, the orientation distribution function(ODF) of the sample with the strain of 50% demonstrated a strong {110}<211> texture and a relatively weak {001}<100> texture. The texture evolution was discussed using the plastic work values of the grains with various orientations, which were calculated according to the Taylor model and the virtual work principle. The experimental results show that the expended plastic work of the grains with {110} orientation is 9.69 MPa, which is distinctly higher than those of the grains with the {001} and {111} orientations. This indicates that the formation of the {110} orientated texture would be preferred with increasing strain in good agreement with the experimental result.展开更多
We report on white organic light-emitting diodes （WOLEDs） based on polyvinylcarbazole （PVK） doped with 1,1-bis（（di-4-tolylamino）phenyl）cyclohexane （TAPC） and perylene, and investigate the luminescence mechan...We report on white organic light-emitting diodes （WOLEDs） based on polyvinylcarbazole （PVK） doped with 1,1-bis（（di-4-tolylamino）phenyl）cyclohexane （TAPC） and perylene, and investigate the luminescence mechanism of the devices. The chromaticity of light emission can be tuned by adjusting the concentration of the dopants. White light with the Commission Internationale de L＇Eclairage （CIE） coordinates of （0.33, 0.34） is achieved by mixing the yellow electromer emission of TAPC and the blue monomer emission of perylene from the device ITO/PVK： TAPC： perylene （100：9：1 in wt.） （100 nm）/tris-（8-hydroxyquinoline aluminum （Alq3） （10 nm）/A1. The device exhibits a maximal luminance of 3727 cd/m2 and a current efficiency of 2 cd/A.展开更多
Objective In order to discuss the effects of hig h-voltage alternative electromagn etic field on stroke.Method126cases of stroke patients were treated by high-volta ge alternative electromagnetic fie ld,combined with ...Objective In order to discuss the effects of hig h-voltage alternative electromagn etic field on stroke.Method126cases of stroke patients were treated by high-volta ge alternative electromagnetic fie ld,combined with kinesiotherapy an d occupational combine therapy.Result66cases showed significant effect,52cases were improved and 8cases showed no improvement.The score of Barthel and FIM assessment after treatment was increased significantly(P <0.001).Conclusion The effect of high-voltage alternat ive electromagnetic field on stroke is sig-nificant.展开更多
A new type ofFB2 electrom agnetic anti-exploding valve w as studied.The valve willbeuseable to solvem uch heavy dam age ofthe hydraulicsystem caused by som e pipes orhydraulicelem entsexplosion. Thetheoreticalanalysis...A new type ofFB2 electrom agnetic anti-exploding valve w as studied.The valve willbeuseable to solvem uch heavy dam age ofthe hydraulicsystem caused by som e pipes orhydraulicelem entsexplosion. Thetheoreticalanalysisand theexperim entalresultsindicated thatthe valve has the advantages ofsim ple construction,convenience and reliability, asw ellas a good response.展开更多
基金Funded by the National Fundamental Research Program of China(No.2011CB012806)
文摘The grain refinement mechanism and texture evolution of electromagnetically formed polycrystalline Cu sheets were investigated using the electron back-scattered diffraction(EBSD) technique. It is found that the average grain size decreases from 35.88 μm to 8.77 μm. The grain refinement was mainly attributed to dynamic recrystallization(DRX) at the grain boundary regions of bulged Cu samples where the inhomogeneous dislocation density and the large lattice misorientation were observed. The DRX mechanisms at the grain boundaries were discussed with respect to the strain-induced grain boundary migration nucleation. Moreover, the orientation distribution function(ODF) of the sample with the strain of 50% demonstrated a strong {110}<211> texture and a relatively weak {001}<100> texture. The texture evolution was discussed using the plastic work values of the grains with various orientations, which were calculated according to the Taylor model and the virtual work principle. The experimental results show that the expended plastic work of the grains with {110} orientation is 9.69 MPa, which is distinctly higher than those of the grains with the {001} and {111} orientations. This indicates that the formation of the {110} orientated texture would be preferred with increasing strain in good agreement with the experimental result.
基金Project supported by the National Natural Science Foundation of China (Grant Nos. 61177017,61125505,60978061,61077022,61036007,and 60877005)the 111 Project (Grant No. B08002)
文摘We report on white organic light-emitting diodes （WOLEDs） based on polyvinylcarbazole （PVK） doped with 1,1-bis（（di-4-tolylamino）phenyl）cyclohexane （TAPC） and perylene, and investigate the luminescence mechanism of the devices. The chromaticity of light emission can be tuned by adjusting the concentration of the dopants. White light with the Commission Internationale de L＇Eclairage （CIE） coordinates of （0.33, 0.34） is achieved by mixing the yellow electromer emission of TAPC and the blue monomer emission of perylene from the device ITO/PVK： TAPC： perylene （100：9：1 in wt.） （100 nm）/tris-（8-hydroxyquinoline aluminum （Alq3） （10 nm）/A1. The device exhibits a maximal luminance of 3727 cd/m2 and a current efficiency of 2 cd/A.
文摘Objective In order to discuss the effects of hig h-voltage alternative electromagn etic field on stroke.Method126cases of stroke patients were treated by high-volta ge alternative electromagnetic fie ld,combined with kinesiotherapy an d occupational combine therapy.Result66cases showed significant effect,52cases were improved and 8cases showed no improvement.The score of Barthel and FIM assessment after treatment was increased significantly(P <0.001).Conclusion The effect of high-voltage alternat ive electromagnetic field on stroke is sig-nificant.
文摘A new type ofFB2 electrom agnetic anti-exploding valve w as studied.The valve willbeuseable to solvem uch heavy dam age ofthe hydraulicsystem caused by som e pipes orhydraulicelem entsexplosion. Thetheoreticalanalysisand theexperim entalresultsindicated thatthe valve has the advantages ofsim ple construction,convenience and reliability, asw ellas a good response.
