全文获取类型
收费全文 | 153篇 |
免费 | 3篇 |
国内免费 | 1篇 |
专业分类
化学 | 95篇 |
晶体学 | 3篇 |
力学 | 1篇 |
数学 | 2篇 |
物理学 | 56篇 |
出版年
2023年 | 1篇 |
2022年 | 2篇 |
2021年 | 3篇 |
2019年 | 2篇 |
2018年 | 2篇 |
2017年 | 3篇 |
2016年 | 3篇 |
2015年 | 2篇 |
2014年 | 3篇 |
2013年 | 10篇 |
2012年 | 6篇 |
2011年 | 8篇 |
2010年 | 8篇 |
2009年 | 6篇 |
2008年 | 11篇 |
2007年 | 8篇 |
2006年 | 8篇 |
2005年 | 9篇 |
2004年 | 6篇 |
2003年 | 2篇 |
2002年 | 3篇 |
2000年 | 1篇 |
1999年 | 2篇 |
1998年 | 1篇 |
1996年 | 3篇 |
1995年 | 4篇 |
1994年 | 4篇 |
1993年 | 4篇 |
1992年 | 4篇 |
1991年 | 1篇 |
1990年 | 2篇 |
1989年 | 1篇 |
1988年 | 2篇 |
1985年 | 1篇 |
1984年 | 4篇 |
1981年 | 2篇 |
1980年 | 4篇 |
1979年 | 1篇 |
1978年 | 2篇 |
1977年 | 1篇 |
1976年 | 2篇 |
1975年 | 1篇 |
1973年 | 3篇 |
1970年 | 1篇 |
排序方式: 共有157条查询结果,搜索用时 15 毫秒
41.
Furukawa T Matsuo Y Hatakeyama A Fukuyama Y Kobayashi T Izumi H Shimoda T 《Physical review letters》2006,96(9):095301
The longitudinal electronic spin relaxation time of Cs atoms optically polarized in superfluid helium (He II, 1.5 K) has been measured with special care to cope with a serious decrease in the number of Cs atoms in the observation region. This decrease, mainly caused by helium convection in introducing the atoms into He II by laser sputtering, was significantly reduced using a new atom implantation method. Combined with a careful correction for the number of atoms, we have determined the relaxation time to be 2.24(19) s or longer, roughly twice as long as that in solid He. 相似文献
42.
Yuki Shimoda 《Journal of solid state chemistry》2010,183(1):33-40
Quadruple perovskites Ba4LnRu3O12 (Ln=La, Nd, Sm-Gd, Dy-Lu) were prepared and their magnetic properties were investigated. They adopt the 12L-perovskite-type structure consisting of Ru3O12 trimers and LnO6 octahedra. All of these compounds show an antiferromagnetic transition at 2.5-30 K. For Ba4NdRu3O12, ferrimagnetic ordering has been observed at 11.5 K. The observed magnetic transition is due to the magnetic behavior of the Ru4.33+3O12 trimer with S=. Magnetic properties of Ba4LnRu3O12 were compared with those of triple perovskites Ba3LnRu2O9 and double perovskites Ba2LnRuO6. 相似文献
43.
Yuki Shimoda 《Journal of solid state chemistry》2010,183(9):1962-1969
Structures and magnetic and electrical properties of quadruple perovskites containing rare earths Ba4LnM3O12 (Ln=rare earths; M=Ru, Ir) were investigated. They crystallize in the 12L-perovskite-type structure. Three MO6 octahedra are connected to each other by face-sharing and form a M3O12 trimer. The M3O12 trimers and LnO6 octahedra are alternately linked by corner-sharing, forming the perovskite-type structure with 12 layers. For Ln=Ce, Pr, and Tb, both the Ln and M ions are in the tetravalent state (Ba4Ln4+M4+3O12), and for other Ln ions, Ln ions are in the trivalent state and the mean oxidation state of M ions is +4.33 (Ba4Ln3+M4.33+3O12). All the Ba4Ln3+Ru4.33+3O12 compounds show magnetic ordering at low temperatures, while any of the corresponding iridium-containing compounds Ba4Ln3+Ir4.33+3O12 is paramagnetic down to 1.8 K. Ba4Ce4+Ir4+3O12 orders antiferromagnetically at 10.5 K, while the corresponding ruthenium-containing compound Ba4Ce4+Ru4+3O12 is paramagnetic. These magnetic results were well understood by the magnetic behavior of M3O12. The effective magnetic moments and the entropy change for the magnetic ordering show that the trimers Ru4.33+3O12 and Ir4+3O12 have the S= ground state, and in other cases there is no magnetic contribution from the trimers Ru4+3O12 or Ir4.33+3O12.Measurements of the electrical resistivity of Ba4LnM3O12 and its analysis show that these compounds demonstrate two-dimensional Mott-variable range hopping behavior. 相似文献
44.
Critchley K Zhang L Fukushima H Ishida M Shimoda T Bushby RJ Evans SD 《The journal of physical chemistry. B》2006,110(34):17167-17174
We report thiol-on-gold self-assembled monolayers (SAMs) that can be photodeprotected using soft UV irradiation (lambda = 365 nm) to yield CO(2)H functionalized surfaces complementing those reported previously, which yielded NH(2) functionalized surfaces. The photolysis of these SAMs were monitored using a combination of surface sensitive techniques. In the SAM environment the photodeprotection yields are lower than those obtained for equivalent reactions in dilute solution. The protected carboxylic acids SAMs are shown to have a low yield approximately 50% due to competing photoreduction reactions of the nitro group. The results from infrared studies show that, as the photolysis progresses, the long chain protected residues reorganize and shield the functional COOH groups, thereby reducing the hydrophilic character of the surface. 相似文献
45.
46.
47.
Xiaoqing Zhang Masahiko Shimoda Akinobu Toyoda 《Journal of Polymer Science.Polymer Physics》1994,32(8):1399-1406
The molecular motion of crosslinked polyepichlorohydrin (PECH) is studied qualitatively by NMR techniques. The results of temperature dependence of 1H T2 and T1 indicate that the crosslinking (crosslink density < 3%) restricts molecular motions of the polymer even far above its Tg. The 1H T1 minimum, corresponding to the large-scale chain-motion of crosslinked PECH, shifts to higher temperatures with increasing crosslink density. 1H T2 data also show that the crosslinking hinders free chain motions of the polymer above its Tg. The 13C T1 relaxation time is sensitive to such motional changes as well. 13C linewidths of crosslinked PECHs vary with the crosslink density in both the swollen state and the solid state. The mechanism of 13C linewidth broadening of crosslinked polymers is discussed in detail. In the case of PECH, the linewidth broadening is caused by changing molecular environment due to crosslinking (such as presence of various chemical shift structures and freezing effects in conformational environment as chain mobility decreases), rather than increasing correlation times, which shorten the relaxation time (T2) of polymer chains. © 1994 John Wiley & Sons, Inc. 相似文献
48.
H. Okuno K. Asahi H. Ueno H. Sato M. Adachi T. Kubo T. Nakamura N. Inabe A. Yoshida Y. Ohkubo T. Ichihara M. Ishihara T. Shimoda H. Miyatake N. Takahashi 《Hyperfine Interactions》1993,78(1-4):97-103
A method to produce beams of polarized unstable nuclei was developed, which fully exploits the advantageous features of the projectile fragmentation reaction. The method was applied tog-factor measurements of several neutron-rich nuclei. We present experimental results so far obtained and discuss capabilities and limitations the present polarization method has. 相似文献
49.
Sulphadimethoxine is metabolized in humans by N1-glucuronidation and by N4-acetylation. Sulphadimethoxine-N1-glucuronide can be measured by the direct high-performance liquid chromatographic analysis and without enzymic deglucuronidation. The N1-glucuronide can be measured by an isocratic as well as by a gradient mobile phase. The group contribution of the N1-glucuronide moiety to the capacity factor is a reduction of 0.24 in the isocratic system and 0.55 in the gradient system. N4-Acetylation increases the capacity factor by a factor 1.4 in the isocratic system and by 1.06 in the gradient system. 相似文献
50.
Okubo T Kawajiri R Mitani T Shimoda T 《Journal of the American Chemical Society》2005,127(50):17598-17599
The first mixed-valence coordination polymer indicating ferroelectric properties, {[CuI4CuII(Et2dtc)2Cl3][CuII(Et2dtc)2]2(FeCl4)}n (Et2dtc- = diethyldithiocarbamate), has been synthesized and crystallographically characterized. This complex has a two-dimensional infinite square lattice structure, including both Cu(I) and Cu(II) ions, which is confirmed by XPS and SQUID measurements. In addition, the ferroelectric behaviors are revealed by the dielectric measurements with a LCR meter and a ferroelectric tester. 相似文献