全文获取类型
收费全文 | 105篇 |
免费 | 1篇 |
专业分类
化学 | 49篇 |
晶体学 | 1篇 |
数学 | 2篇 |
物理学 | 54篇 |
出版年
2018年 | 1篇 |
2016年 | 1篇 |
2015年 | 1篇 |
2013年 | 4篇 |
2012年 | 3篇 |
2011年 | 1篇 |
2010年 | 1篇 |
2009年 | 2篇 |
2008年 | 6篇 |
2007年 | 1篇 |
2006年 | 6篇 |
2005年 | 5篇 |
2004年 | 2篇 |
2003年 | 1篇 |
2002年 | 4篇 |
2001年 | 1篇 |
2000年 | 4篇 |
1998年 | 2篇 |
1997年 | 2篇 |
1996年 | 3篇 |
1995年 | 3篇 |
1994年 | 3篇 |
1992年 | 3篇 |
1991年 | 2篇 |
1989年 | 1篇 |
1987年 | 2篇 |
1985年 | 3篇 |
1984年 | 3篇 |
1982年 | 4篇 |
1981年 | 3篇 |
1980年 | 4篇 |
1979年 | 3篇 |
1978年 | 3篇 |
1974年 | 1篇 |
1973年 | 1篇 |
1972年 | 1篇 |
1971年 | 2篇 |
1970年 | 1篇 |
1968年 | 2篇 |
1966年 | 1篇 |
1956年 | 2篇 |
1931年 | 1篇 |
1922年 | 2篇 |
1913年 | 2篇 |
1888年 | 2篇 |
排序方式: 共有106条查询结果,搜索用时 15 毫秒
91.
92.
Axel Kleemann 《Nachrichten aus der Chemie》1996,44(6):632-634
93.
94.
L. Zhang W. Kleemann J. Dec R. Wang M. Itoh 《The European Physical Journal B - Condensed Matter and Complex Systems》2002,28(2):163-171
The dielectric permittivity ε′ - i
of SrTi 18O 3 (STO18) is studied under a dc electric field E as a function of the temperature, T. In ε′
vs.
T, a double-peak is found when 0 < E < 30 KV/m. While the peak at high-T is attributed to the smeared ferroelectric phase transition, the low-T one is induced by domain wall motion. The transverse Ising model including an external homogeneous and quenched random-fields
is successfully used to describe both the smeared phase transition and the domain wall response in the low-T domain state. The calculations are in good agreement with the experimental results.
Received 4 January 2002 / Received in final form 25 March 2002 Published online 19 July 2002 相似文献
95.
Two weakly discontinuous structural phase transitions have been observed on single domains of KCdF3 at Tc1 = 487.5 K and at Tc2 = 472.7 K in the temperature dependence of the linear birefringence (LB). Beginning with the cubic high temperature phase the crystal becomes successively uniaxial and biaxial birefringent. Within the classical Landau approximation the LB has proved to be proportional to the square of the respective order parameter of the transformations. A relation which describes the coupling between both order parameters is discussed. In disagreement with Hidaka et al. [7] we do not observe a third phase transition near 240 K by the LB technique. 相似文献
96.
The preparations of CH2SF4 and CH3CHSF4 are presented and the structures are discussed. Addition reactions of polar species give a wide range of new compounds, like Hg(CH2SF5)2, F4AsCH2SF5, cisBrSF4CH3, cisF5SeOSF4CH2Br, a.o. While CH2SF4 decomposes at room temperature slowly to CH2CH2 and SF4, at high temperatures HF and CSF2 are formed. CH3CHSF4 gives mainly CH3CHF2 at room temperature. The “saturated” compounds CH3SF5 and C2H5SF5 have been prepared. They react with SbF5 in SO2 at low temperatures to form the cations CH3SF4+ and C2H5SF4+. The CH3SF4+ ion has been investigated in detail by nmr methods at low temperatures. It decomposes to CH3 and SF4, which react further in the SO2/SbF5 system to CH3OSO+ and SF3+. 相似文献
97.
98.
99.
Shvartsman VV Bedanta S Borisov P Kleemann W Tkach A Vilarinho PM 《Physical review letters》2008,101(16):165704
By close analogy with multiferroic materials with coexisting long-range electric and magnetic orders a "multiglass" scenario of two different glassy states is observed in Sr(0.98)Mn(0.02)TiO(3) ceramics. Sr-site substituted Mn2+ ions are at the origin of both a polar and a spin glass with glass temperatures T(g) approximately equal to 38 K and < or =34 K, respectively. The structural freezing triggers that of the spins, and both glassy systems show individual memory effects. Thanks to strong spin-phonon interaction within the incipient ferroelectric host crystal SrTiO3, large higher order magnetoelectric coupling occurs between both glass systems. 相似文献
100.