首页 | 本学科首页   官方微博 | 高级检索  
文章检索
  按 检索   检索词:      
出版年份:   被引次数:   他引次数: 提示:输入*表示无穷大
  收费全文   56篇
  物理学   56篇
  2013年   1篇
  2012年   1篇
  2011年   1篇
  2010年   1篇
  2009年   6篇
  2008年   7篇
  2007年   7篇
  2006年   7篇
  2005年   2篇
  2002年   3篇
  1999年   2篇
  1996年   3篇
  1995年   3篇
  1992年   1篇
  1991年   1篇
  1990年   1篇
  1988年   4篇
  1987年   3篇
  1979年   1篇
  1976年   1篇
排序方式: 共有56条查询结果,搜索用时 203 毫秒
1.
The nuclear spin-lattice relaxation rate, 1/T1, has been measured in weak itinerant ferromagnets Y(Co1−xAlx)2. The temperature and magnetic field dependence of 1/T1T has been found to be well described by the self-consistent renormalization (SCR) theory of spin fluctuations. The parameters characterizing spin fluctuations in this system were estimated from NMR and magnetic measurements. The temperature dependence of susceptibility calculated from these parameters well reproduces the experimental results.  相似文献
2.
The elastic scattering of 1 GeV protons from 4He is analysed, by taking into account the effects of nuclear correlation and the Wallace correction to the eikonal expansion. The value lc = 0.75 frmfm of the nuclear correlation length is obtained.  相似文献
3.
The frequency dependence of the reflectivity spectra of doped La2–x Sr x CuO4 in a high frequency region is analyzed based on a picture of correlated hole hopping within a lower Hubbard subband. It is shown that experimental trends are fairly well accounted for by this model, suggesting that the normal state of this compound is quite different from the metallic state.  相似文献
4.
The energy of a pair of holes in a half-filled 2—d Hubbard model is studied assuming an antiferromagnetic spin configuration. By comparing with the energy of a single hole, we discuss the possibility of pairing of holes in connection with the recently discovered highT c superconductivity.  相似文献
5.
We have developed a novel optical fiber ring laser using a semiconductor optical amplifier (SOA) as the gain medium, and taking advantage of polarization anisotropy of its gain. The laser can control the oscillation frequency difference between two counterpropagating lights by incorporating a birefringent medium into the ring resonator. Since the frequency difference is proportional to the birefringence, it can be measured to detect the beat frequency generated by combining two counterpropagating lights and the laser can be applied to an optical fiber sensor whose detecting signal is in frequency domain. Electric field sensor was demonstrated with a lithium niobate crystal as a sensing probe.  相似文献
6.
7.
8.
9.
The embedded Si structure formed by pattern-dependent oxidation (PADOX) in single-electron device (SED) is analyzed by novel microscopic methods using scanning electron microscopy (SEM) and atomic force microscopy (AFM). The surface charge imaging SEM reveals the outline of the embedded Si nanowire of the electrically-measured SED. The size of the wire in the device is small enough to make a potential barrier caused by the quantum mechanical size effect. The result of the Si height in the oxidized structure estimated by AFM indicates that the huge stress induced by oxidation is applied to the narrow Si wire. The experimental results support the theoretical model of the SED fabricated by PADOX that the potential profile responsible for the SED operation is produced by two effects, the quantum mechanical size effect and the strain-induced bandgap reduction.  相似文献
10.
Dynamics of a filament discharge in a discharge-excited XeCl excimer laser medium has been simulated for a sequence of discharge pulses (shots). In the present model a filament discharge is triggered at a microprotrusion on a cathode surface. After the first discharge initiation, a hot spot is created near the cathode, then filament develops toward the anode in the second shot. Images of the filament discharge development and its properties in a XeCl excimer laser are presented  相似文献
设为首页 | 免责声明 | 关于勤云 | 加入收藏

Copyright©北京勤云科技发展有限公司  京ICP备09084417号