排序方式: 共有194条查询结果,搜索用时 15 毫秒
101.
Zhan-Ping Feng Gao-Ren Li Jin-Hui Zhong Zi-Long Wang Yan-Nan Ou Ye-Xiang Tong 《Electrochemistry communications》2009,11(3):706-710
MnO2 multilayer nanosheet clusters were prepared via electrochemical deposition route, which shows simpleness and high efficiency. The growth process of MnO2 multilayer nanosheet clusters was investigated in this paper. The deposited MnO2 films were characterized by XRD, SEM, TEM, and XPS. In addition, it was also electrochemically characterized by cyclic voltammetry in 1.0 M Na2SO4 electrolyte. The MnO2 multilayer nanosheet clusters show a big specific capacitance, and it can be achieved about 521.5 F g?1 at 5 mV s?1. These materials also have a high electrochemical stability. 相似文献
102.
Yun-Fei FanHai-Hua Wang Xiao-Gang Wei Ai-Jun LiZhi-Hui Kang Jin-Hui WuHan-Zhuang Zhang Huai-Liang XuJin-Yue Gao 《Physics letters. A》2012,376(5):785-787
We experimentally demonstrate a light storage via slow-light four-wave mixing in a solid-state medium with a four-level double lambda scheme. Using slow light based on electromagnetically induced transparency, we obtain a slowed four-wave mixing signal pulse together with the slowed probe pulse. During the propagation of light pulses, the storage and retrieval of both the slowed four-wave mixing pulse and the slowed probe pulse are studied by manipulating the intensities of the control fields. 相似文献
103.
Production and properties of φ-meson under the extreme hot dense matter which is formed in Au + Au collisions at RHIC energy have been briefly reviewed.The issues are focused on transverse momentum (p T ) spectra of φ,elliptic flow of φ,nuclear modification factor of φ,the ratio of Ω(p T )/φ(p T ) versus p T,the ratio of Ω(p T /3)/φ(p T /2) versus p T /n q,spin alignment of φ and the enhancement of φ etc.These observables give the significant information of the strange quark dynamics in hot dense matter under the extreme condition. 相似文献
104.
北京正负电子对撞机重大改造工程(BEPCⅡ)采用的是新型冲击磁铁Slotted Pipe Kicker, 其结构上要求双极性供电. 平衡变压器是实现双极性的关键部件, 是解决脉冲源闸流管阴极可直接接地的绝好技术途径. 平衡变压器是一种具有特殊用途的高压快脉冲变压器, 因此其设计除了要解决高压快脉冲变压器的一般性技术问题外, 还必须着重考虑电流平衡度指标. 通过理论分析、模拟计算和测试实验证明不平衡电流主要由变压器的励磁电流和磁芯涡流损耗等效电流两部分组成. 平衡变压器磁芯材料和几何尺寸选取, 以及原副边导体结构设计是
实现设计指标的关键所在. 样机测试结果与设计计算结果相符, 验证了平衡变压器设计理论的正确性, 且平衡度D<1%达到预定指标. 相似文献
105.
Investigation on the deformation of Ne and Mg isotope chains within relativistic mean-field model 下载免费PDF全文
Ne and Mg isotope chains are investigated based on constrained calculations in the framework of a deformed relativistic mean-field (RMF) model with the NL075 parameter set. The calculated quadrupole deformation and binding energy are compared with other theoretical results as well as the available experimental data. It shows that the calculated deformations of Ne and Mg with the NL075 are more accurate than those obtained with the NL-SH. It is predicted that ^19,29,32Ne and ^20,31Mg maybe have a triaxial deformation and ^25-28Ne and ^27-30Mg exhibit a shape coexistence probably. The closure effect of neutron number N=8 for ^20Mg is predicted to be very weak. 相似文献
106.
107.
将VC等量加入Eu-PMo12O40溶液中,PMo12O403-被还原由浅黄色变为蓝色,同时Eu3+的荧光淬灭。利用UV-Vis、PL光谱法分别测定不同VC浓度下Eu-PMo12O40的紫外可见光谱、荧光光谱,以700 nm处的吸光度对VC浓度作图,得到VC的线性检测范围为0~0.40 mmol·L-1、检出限为0.0258μmol·L-1;以591 nm处的荧光强度对VC浓度作图,获得VC的线性检测范围为0~0.64 mmol·L-1、检出限为0.0361μmol·L-1。最后,在VC还原和H2O2氧化下,研究了Eu-PMo12O40变色/荧光开关性质的可逆性以及对VC检测的可重复使用性。 相似文献
108.
以6-甲氧基-7-羟基香豆素的核磁共振氢谱为例,介绍了MestReNova软件在有机化合物波谱解析教学中的具体应用。通过学生对该核磁软件的熟悉和应用,更深理解核磁光谱中所涉及的参数,如化学位移、偶合常数的由来、积分比例与质子数目的关系等,进而提高学生的学习兴趣和学习积极性,在独立处理图谱基础上解析图谱,更好地将理论知识应用到解析实例中,理论知识和实际应用有机融合,有利于培养学生探索能力、解决实际问题的能力,为将来进入科研领域培养思维能力和独立思考能力。 相似文献
109.
侧链型磺化聚芳醚酮质子交换膜材料的制备 总被引:1,自引:0,他引:1
本文通过对聚合物的结构设计, 采用均聚的途径将柔顺的大侧基(甲氧基苯基)引入聚芳醚酮侧链, 然后通过室温后磺化的方法成功制备出侧链型磺化聚芳醚酮材料. 此类材料表现出较好的热稳定性; 力学性能优异; 聚合物的质子传导率比报道过的类似材料有较大程度的提高; 于80 ℃时的质子传导率在0.190 S/cm以上, 超过了Nafion 117 薄膜的传导率(0.175 S/cm). 因此这类材料有望在质子交换膜领域得到应用. 相似文献
110.
Polarization-dependent efficient Cherenkov radiation at visible wavelengths in hollow-core photonic crystal fiber cladding 下载免费PDF全文
Efficient Cherenkov radiation (CR) is experimentally generated by a soliton self-frequency shift (SSFS) in a knot of hollow-core photonic crystal fiber (HC-PCF). When the angle of the half-wave plate is rotated from 0° to 45° , the Raman soliton shifts from 2227 to 2300 nm, the output power of the CR increases 8.15 times, and the maximum output power ratio of the CR at 556 nm to the residual pump is estimated to be 20:1. The width of the output optical spectrum at visible wavelengths broadens from 25 to 45 nm, and the conversion efficiency of the CR can be above 28%. Moreover, the influences of the pump polarization and wavelength on the CR are studied, and the corresponding nonlinear processes are discussed. 相似文献