通过正交对比试验和对结果数据的方差分析,考察了粘合剂组成、化成制度、化成电解液、干燥方式、平整压力、棉纸、保存方式以及激活电解液组成对干荷式锌银蓄电池涂膏锌负极大电流密度180 m A/cm2放电性能的影响。结果表明:激活电解液...通过正交对比试验和对结果数据的方差分析,考察了粘合剂组成、化成制度、化成电解液、干燥方式、平整压力、棉纸、保存方式以及激活电解液组成对干荷式锌银蓄电池涂膏锌负极大电流密度180 m A/cm2放电性能的影响。结果表明:激活电解液组成、干燥方式和粘合剂组成对放电性能有特别显著的影响;化成制度对放电性能有显著影响;而化成电解液、平整压力、棉纸和保存方式对放电性能影响不大。展开更多
Cu/diamond composites have been considered as the next generation of thermal management material for electronic packages and heat sinks applications. Cu/diamond composites with different volume fractions of diamond we...Cu/diamond composites have been considered as the next generation of thermal management material for electronic packages and heat sinks applications. Cu/diamond composites with different volume fractions of diamond were successfully prepared by spark plasma sintering（SPS） method. The sintering temperatures and volume fractions（50%, 60% and 70%） of diamond were changed to investigate their effects on the relative density, homogeneity of the microstructure and thermal conductivity of the composites. The results show that the relative density, homogeneity of the microstructure and thermal conductivity of the composites increase with decreasing the diamond volume fraction; the relative density and thermal conductivity of the composites increase with increasing the sintering temperature. The thermal conductivity of the composites is a result of the combined effect of the volume fraction of diamond, the homogeneity and relative density of the composites.展开更多
NiOOH was prepared by one-step electrolysis of spherical Ni（OH）2 and the effects of electrolysis parameters were examined. The highly pure NiOOH was obtained after electrolysis at a current density of 60mA.g^-1 and...NiOOH was prepared by one-step electrolysis of spherical Ni（OH）2 and the effects of electrolysis parameters were examined. The highly pure NiOOH was obtained after electrolysis at a current density of 60mA.g^-1 and 30℃ with anodic potential controlled in the range of 1.73-1.85V （vs. Zn/ZnO） for 360min. The NiOOH samriles were characterized bv X-ray oowder diffraction （XRD） and scanning electron microscope （SEM） analysis.Resuits indicate that the electrolysis product is spherical NiOOH doped with graphite. Charge and discharge tests show that the prepared NiOOH offers a discharge capacity of over 270mAh·g^-1 at current density of 30mA·g^-1 and can be directly used as cathode material of alkaline Zn/NiOOH batteries. Galvanostatic charge/discharge and cyclic voltammetry （CV） tests reveal good cycling reversibility, of the NiOOH electrode.展开更多
本文采用溶胶-凝胶法制备Ba_xSr_(1-x)Zr_(0.18)Ti_(0.82)O_3(x=0.3,0.4,0.5)陶瓷粉末,通过传统的陶瓷制备方法制备陶瓷样品,研究了不同Ba/Sr比对陶瓷结构及充放电性能的影响。研究结果显示,随着Ba/Sr的增加,陶瓷的介电常数变大,居里温...本文采用溶胶-凝胶法制备Ba_xSr_(1-x)Zr_(0.18)Ti_(0.82)O_3(x=0.3,0.4,0.5)陶瓷粉末,通过传统的陶瓷制备方法制备陶瓷样品,研究了不同Ba/Sr比对陶瓷结构及充放电性能的影响。研究结果显示,随着Ba/Sr的增加,陶瓷的介电常数变大,居里温度向高温方向移动,介电性由线性向非线性演变;室温下,Ba_(0.5)Sr_(0.5)Zr_(0.18)Ti_(0.82)O_3陶瓷有最大的介电常数(~2250,0.004,1 k Hz),最大的饱和极化(~10.8μC/cm^2,110 k V/cm),最大的能量密度(~0.42 J/cm^3,110 k V/cm),其放电效率也达到93%。展开更多
In order to obtain higher emission performance than that of a traditional M-type cathode, we have developed a new type impregnated dispenser cathode. The new cathode is impregnated with a new active substance with mol...In order to obtain higher emission performance than that of a traditional M-type cathode, we have developed a new type impregnated dispenser cathode. The new cathode is impregnated with a new active substance with molar ratio of 26BaO·29SrO·8Sc2O3 ·7CaO·Al2O3 . This paper introduces the emission performance, surface active material, and work function of the new cathode. At 1100℃B , the DC current density and pulse current density are 30.6±1.0 A/cm2 and 171.6±2.8 A/cm2 , respectively, 2.1 and 5.4 times of that of an M-type cathode. The work function of the new cathode is 1.668± 0.002 eV. High concentration O-Al-Sc-Sr-Ba and O-Al-Sc-Ba are found in the pores and at pore edges, respectively. By comparing the emission performances and surface characteristics of as-polished and as-cleaned cathodes, it is proposed that, the emission around pore ends forms the major part of the total emission for the new cathodes.展开更多
A one-dimensional,self-consistent fluid model is developed for a computational investigation on discharge characteristics and dynamics of radio frequency(RF) glow discharges in atmospheric argon,which are demonstrated...A one-dimensional,self-consistent fluid model is developed for a computational investigation on discharge characteristics and dynamics of radio frequency(RF) glow discharges in atmospheric argon,which are demonstrated through the spatial and temporal profiles of plasma species,electric field,and mean electron energy.Furthermore,in the discharge current density range from 7.1 mA/cm2 to 119.5 mA/cm2,different discharge operation modes of α and γ are indicated by changing differential conductivity of voltage-current characteristics and sheath dynamics in terms of sheath voltage and sheath thickness.展开更多
文摘通过正交对比试验和对结果数据的方差分析,考察了粘合剂组成、化成制度、化成电解液、干燥方式、平整压力、棉纸、保存方式以及激活电解液组成对干荷式锌银蓄电池涂膏锌负极大电流密度180 m A/cm2放电性能的影响。结果表明:激活电解液组成、干燥方式和粘合剂组成对放电性能有特别显著的影响;化成制度对放电性能有显著影响;而化成电解液、平整压力、棉纸和保存方式对放电性能影响不大。
文摘Cu/diamond composites have been considered as the next generation of thermal management material for electronic packages and heat sinks applications. Cu/diamond composites with different volume fractions of diamond were successfully prepared by spark plasma sintering（SPS） method. The sintering temperatures and volume fractions（50%, 60% and 70%） of diamond were changed to investigate their effects on the relative density, homogeneity of the microstructure and thermal conductivity of the composites. The results show that the relative density, homogeneity of the microstructure and thermal conductivity of the composites increase with decreasing the diamond volume fraction; the relative density and thermal conductivity of the composites increase with increasing the sintering temperature. The thermal conductivity of the composites is a result of the combined effect of the volume fraction of diamond, the homogeneity and relative density of the composites.
文摘NiOOH was prepared by one-step electrolysis of spherical Ni（OH）2 and the effects of electrolysis parameters were examined. The highly pure NiOOH was obtained after electrolysis at a current density of 60mA.g^-1 and 30℃ with anodic potential controlled in the range of 1.73-1.85V （vs. Zn/ZnO） for 360min. The NiOOH samriles were characterized bv X-ray oowder diffraction （XRD） and scanning electron microscope （SEM） analysis.Resuits indicate that the electrolysis product is spherical NiOOH doped with graphite. Charge and discharge tests show that the prepared NiOOH offers a discharge capacity of over 270mAh·g^-1 at current density of 30mA·g^-1 and can be directly used as cathode material of alkaline Zn/NiOOH batteries. Galvanostatic charge/discharge and cyclic voltammetry （CV） tests reveal good cycling reversibility, of the NiOOH electrode.
文摘本文采用溶胶-凝胶法制备Ba_xSr_(1-x)Zr_(0.18)Ti_(0.82)O_3(x=0.3,0.4,0.5)陶瓷粉末,通过传统的陶瓷制备方法制备陶瓷样品,研究了不同Ba/Sr比对陶瓷结构及充放电性能的影响。研究结果显示,随着Ba/Sr的增加,陶瓷的介电常数变大,居里温度向高温方向移动,介电性由线性向非线性演变;室温下,Ba_(0.5)Sr_(0.5)Zr_(0.18)Ti_(0.82)O_3陶瓷有最大的介电常数(~2250,0.004,1 k Hz),最大的饱和极化(~10.8μC/cm^2,110 k V/cm),最大的能量密度(~0.42 J/cm^3,110 k V/cm),其放电效率也达到93%。
基金Supported by the National Natural Science Foundation of China (No. 60871053)the Major State Basic Research Development Program of China (No. 2013CB328901)
文摘In order to obtain higher emission performance than that of a traditional M-type cathode, we have developed a new type impregnated dispenser cathode. The new cathode is impregnated with a new active substance with molar ratio of 26BaO·29SrO·8Sc2O3 ·7CaO·Al2O3 . This paper introduces the emission performance, surface active material, and work function of the new cathode. At 1100℃B , the DC current density and pulse current density are 30.6±1.0 A/cm2 and 171.6±2.8 A/cm2 , respectively, 2.1 and 5.4 times of that of an M-type cathode. The work function of the new cathode is 1.668± 0.002 eV. High concentration O-Al-Sc-Sr-Ba and O-Al-Sc-Ba are found in the pores and at pore edges, respectively. By comparing the emission performances and surface characteristics of as-polished and as-cleaned cathodes, it is proposed that, the emission around pore ends forms the major part of the total emission for the new cathodes.
基金National Natural Science Foundations of China (No. 10835004,No. 10905010)Shanghai Shuguang Program,China (No.08SG31)
文摘A one-dimensional,self-consistent fluid model is developed for a computational investigation on discharge characteristics and dynamics of radio frequency(RF) glow discharges in atmospheric argon,which are demonstrated through the spatial and temporal profiles of plasma species,electric field,and mean electron energy.Furthermore,in the discharge current density range from 7.1 mA/cm2 to 119.5 mA/cm2,different discharge operation modes of α and γ are indicated by changing differential conductivity of voltage-current characteristics and sheath dynamics in terms of sheath voltage and sheath thickness.
