全文获取类型
收费全文 | 103篇 |
免费 | 17篇 |
国内免费 | 20篇 |
专业分类
化学 | 50篇 |
晶体学 | 1篇 |
力学 | 2篇 |
数学 | 10篇 |
物理学 | 77篇 |
出版年
2022年 | 1篇 |
2021年 | 1篇 |
2020年 | 3篇 |
2019年 | 2篇 |
2018年 | 5篇 |
2017年 | 4篇 |
2016年 | 6篇 |
2015年 | 1篇 |
2014年 | 2篇 |
2013年 | 4篇 |
2012年 | 7篇 |
2011年 | 7篇 |
2010年 | 6篇 |
2009年 | 7篇 |
2008年 | 4篇 |
2007年 | 4篇 |
2006年 | 4篇 |
2005年 | 1篇 |
2004年 | 8篇 |
2003年 | 9篇 |
2002年 | 12篇 |
2001年 | 10篇 |
2000年 | 10篇 |
1999年 | 2篇 |
1998年 | 1篇 |
1997年 | 3篇 |
1993年 | 1篇 |
1991年 | 3篇 |
1990年 | 2篇 |
1989年 | 4篇 |
1988年 | 2篇 |
1986年 | 1篇 |
1982年 | 3篇 |
排序方式: 共有140条查询结果,搜索用时 15 毫秒
1.
S. G. Yunusova S. D. Gusakova A. I. Glushenkova U. K. Nadzhimov Sh. Turabekov SA. Musaev 《Chemistry of Natural Compounds》1991,27(2):147-150
A comparative analysis has been made of the amounts of lipids and their fatty-acid compositions in the seeds of the lines of agenetic collection of cotton plants of the speciesGossypium hirsutum and their hybrids and the variety Tashkent-1. The results obtained on the fatty-acid compositions of some hybrids make it possible to recommend the use of individual lines of cotton plants as donors for improving the food-value indices of cottonseed oil.Institute of Chemsitry of Plant Substances, Academy of Sciences of the Uzbek SSR, Tashkent. V. I. Lenin Tashkent State University. Translated from Khimiya Prirodnykh Soedinenii, No. 2, pp. 173–176, March–April, 1991. 相似文献
2.
Komolov A. S. Lazneva E. F. Gerasimova N. B. Sobolev V. S. Panina Yu. A. Pshenichnyuk S. A. Asfandiarov N. L. Handke B. 《Physics of the Solid State》2020,62(7):1245-1250
Physics of the Solid State - The formation of unoccupied electronic states and the boundary potential barrier during thermal deposition of tetracyanoquinodimethane (TCNQ) films to 7 nm in thickness... 相似文献
3.
A model is proposed for superplastic deformation of materials, based on the concept of cooperative grain-boundary slip. The
conditions for superplastic deformation are obtained as conditions for coherent shear bands. Analysis of the temperature dependence
of the limits of the stress interval for superplastic flow is used as a basis for the introduction of two types of threshold
stress that elucidate the cause of the ambiguity in the interpretation of exisiting experimental results.
Fiz. Tverd. Tela (St. Petersburg) 39, 2179–2185 (December 1997) 相似文献
4.
用强子–弦级联模型JPCIAE及相应的Monte Carlo事例产生器研究相对论性核–核碰撞中带电粒子多重数的赝快度密度对能量和中心度的依赖关系.无需另调任何模型参数的条件下,此模型可以同时较好地描述相对论性pp实验数据及PHOBOS和PHENIX实验组的Au+Au实验数据.本文指出:因〈Npart〉并非严格定义的物理量,致使实验上和理论上确定〈Npart〉有一定任意性,从而使得每参加者核子对的带电粒子赝快度密度随着〈Npart〉的增加可能逐渐增大,也可能逐渐减小,因此用它来区分粒子产生机制是欠妥的. 相似文献
5.
S. V. Dmitriev A. A. Nazarov A. I. Potekaev A. I. Pshenichnyuk L. Z. Khadeeva 《Russian Physics Journal》2009,52(2):132-137
Using a biatomic chain of atoms as an example, whose interaction was represented by the Morse potential, we revealed a possibility
for a long-lived, dynamic, long-period, nanosized state to persist in the lattice structure. This nanosized structure (in
the case in question, the length of the spatial period of energy localization was found to be 16–20 nm) is generated under
excitation of a vibrational short-wave mode, with the atoms of the light component only participating. The resulting dynamic
nanostructures are principally different in their nature and characteristics from those described earlier and developed via
a mechanism of modulation instability of short-wave vibrational modes.
Translated from Izvestiya Vysshikh Uchebnykh Zavedenii, Fizika, No. 2, pp. 21–26, February, 2009. 相似文献
6.
W.?Barszczewska J.?Kopyra J.?Wnorowska I.?SzamrejEmail author N. L.?Asfandiarov S. A.?Pshenichnyuk S. A.?Fal’ko 《The European Physical Journal D - Atomic, Molecular, Optical and Plasma Physics》2005,35(2):323-326
Thermal electron attachment rate constants for CH2ClCHBrCH3 and
CH2ClCH2CH2Br have been measured using electron swarm method.
Corresponding rate constants are equal to 3.5×10-10 and
2.5×10-10 cm3 molec-1 s-1, respectively. Parallely,
negative ion mass spectra of these compounds as well as CH2FCH2Br,
CH2ClCH2Br, CH2BrCH2Br and CF3CHClBr has been
measured with negative ion mass spectrometry method. The rate constants have
been compared with the negative ion mass spectra. 相似文献
7.
Exploration for Degradation of Λ Polarization Produced in Relativistic Nucleus Nucleus Collisions 下载免费PDF全文
YE YunXiu CHEN Zhi RUAN TuNan SHEN Ji LV HaiJiang DONG WeiJiang SA BenHao TAI An 《中国物理C(英文版)》2000,24(2):125-130
The degradation of Λ transverse polarization produced in S+Pb central collisions at energy 200 GeV per nucleon has been studied in detail. The S+Pb central collision events have been generated using Monte-Carlo generator——LUCIAE at 200 GeV per nucleon. The various factors degrading Λ transverse polarization have been analysed quantitatively. The ratios of Λ′s produced from rescattering, secondary production and decays of Σ, Ξ hyperons to the total measurable Λ′s in experiment have been investigeted and the degradation effect of these Λ on the total polarization has been determined. The simulation and calculation show that above three factors decrease the Λ transverse polarization strongly, however, can not eliminate the polarization completely when the Λ′s are assumed to be produced from hadronic gas in the final state. To explan the experimental data of vanished Λ polarization, it probably needs to consider new mechanisms of Λ production, including a weak effect of QGP formation. 相似文献
8.
利用溶液聚合和成酰胺反应合成了多功能梳状两亲性共聚物,聚(甲基丙烯酸-co-甲基丙烯酸十八酯)-(乙醇胺-乙二胺叶酸)(PSM-EE-FA).用红外光谱(FTIR),核磁共振(1H-NMR)及凝胶渗透色谱(GPC)表征了该聚合物的结构及分子量分布.实验结果证明合成了该聚合物,其数均分子量(Mn)为28600,多分散性为1.375.用该两亲梳状聚合物包覆油溶性CdSe/ZnS量子点,通过相转移作用,得到水溶性靶向量子点(PSM-EE-FA-QDs).该水溶性量子点溶液具有较好的稳定性.通过紫外-可见(UV-Vis)及荧光发射光谱分析对该量子点的光学性质进行研究.结果表明,PSM-EE-FA-QDs的紫外-可见光谱及荧光发射光谱峰形与原量子点基本一致.由于量子点表面聚合物层的形成,峰位发生少量红移.该量子点水溶液的荧光强度是原量子点氯仿溶液的98%,荧光产率是原量子点氯仿溶液的95%.动态光散射(DLS)及透射电镜(TEM)测试结果表明水溶性量子点分布均匀.合成的水溶性量子点不但光学性能稳定,而且聚合物及水溶性量子点的合成方法较为简便. 相似文献
9.
THE EVIDENCE OF DECONFINEMENT PHASE TRANSITION OF SU(2) LATTICE GAUGE MODEL BY MONTE CARLO METHOD 下载免费PDF全文
In this paper,we have calculated the SU(2) lattice gauge by the Monte Carlo method.For the finite temperature problem 83×4 lattice is used and for the zero temperature problem 84 lattice.From the calculations of the energy density,heat capacity and entropy density,the results indicate that there is a deconfinement phase transition when T/ΛL=40—50. 相似文献
10.