全文获取类型
收费全文 | 299篇 |
免费 | 52篇 |
国内免费 | 17篇 |
专业分类
化学 | 20篇 |
晶体学 | 1篇 |
力学 | 76篇 |
综合类 | 6篇 |
数学 | 38篇 |
物理学 | 227篇 |
出版年
2024年 | 1篇 |
2023年 | 1篇 |
2022年 | 5篇 |
2021年 | 7篇 |
2020年 | 3篇 |
2019年 | 3篇 |
2018年 | 8篇 |
2017年 | 25篇 |
2016年 | 19篇 |
2015年 | 8篇 |
2014年 | 28篇 |
2013年 | 19篇 |
2012年 | 12篇 |
2011年 | 23篇 |
2010年 | 18篇 |
2009年 | 29篇 |
2008年 | 18篇 |
2007年 | 15篇 |
2006年 | 22篇 |
2005年 | 11篇 |
2004年 | 14篇 |
2003年 | 12篇 |
2002年 | 10篇 |
2001年 | 9篇 |
2000年 | 4篇 |
1999年 | 1篇 |
1998年 | 4篇 |
1997年 | 2篇 |
1996年 | 7篇 |
1995年 | 1篇 |
1993年 | 7篇 |
1992年 | 6篇 |
1991年 | 4篇 |
1989年 | 4篇 |
1988年 | 1篇 |
1986年 | 3篇 |
1982年 | 2篇 |
1971年 | 1篇 |
1957年 | 1篇 |
排序方式: 共有368条查询结果,搜索用时 171 毫秒
71.
Uhrmacher M. Kulinska A. Baldokhin Yu. V. Tcherdyntsev V. V. Kaloshkin S. D. Maddalena A. Principi G. 《Hyperfine Interactions》2001,136(3-8):327-332
Hyperfine Interactions - High-energy ball milling of Fe–Mn elemental powder mixtures has been carried out for different Mn concentrations, ranging from 0 to 90%. Mössbauer spectroscopy... 相似文献
72.
73.
74.
In this review paper, we first introduce the basic concept of quantum computer-resistant cryptography, which is the cornerstone of security technology for the network of a new era. Then, we will describe the positioning of mathematical cryptography and quantum cryptography, that are currently being researched and developed. Quantum cryptography includes QKD and quantum stream cipher, but we point out that the latter is expected as the core technology of next-generation communication systems. Various ideas have been proposed for QKD quantum cryptography, but most of them use a single-photon or similar signal. Then, although such technologies are applicable to special situations, these methods still have several difficulties to provide functions that surpass conventional technologies for social systems in the real environment. Thus, the quantum stream cipher has come to be expected as one promising countermeasure, which artificially creates quantum properties using special modulation techniques based on the macroscopic coherent state. In addition, it has the possibility to provide superior security performance than one-time pad cipher. Finally, we introduce detailed research activity aimed at putting the quantum stream cipher into practical use in social network technology. 相似文献
75.
76.
F. Mercier C. Alliot L. Bion N. Thromat P. Toulhoat 《Journal of Electron Spectroscopy and Related Phenomena》2006
Literature is relatively sparse on XPS studies of europium compounds: it is essentially restricted to metallic compounds (EuM5, in which M is a transition metal) or to simple oxides. While particular interest have been devoted to understanding physical phenomenon in the beginning of “shake-down” and “shake-up” satellites evidenced on core-level regions of the lanthanides, few information on absolute binding energies (BE) was available. This paper reports an XPS binding energy data base for europium(III) compounds, in which Eu cation have various chemical environments: simple oxide Eu2O3, Eu mixed oxides with organic oxalate, acetylacetonate or inorganic sulfate, nitrate, carbonate ligands. The values of core-level BE (O1s, Eu3d and Eu4d) and the characteristics of shake-down satellites of Eu3d are reported, and their variations are attributed to ionicity/covalency changes. Such interpretation was already published for Group A mixed oxides and zeolites. These data are needed for determining Eu(III) species sorbed onto minerals in the presence of various ligands in the framework of retention studies for assessing the safety of future nuclear waste disposals. 相似文献
77.
78.
本文叙述在HL-1M装置上用弯晶谱仪获取Fe的类He离子谱,用谱线的多谱勒加宽测量等离子体的离子温度,得到的等离子体HL-1M装置离子温度为500—800eV。 相似文献
79.
80.
A large class of one-generated factorable foliated formations including composition, bicanonical, and other formations is described. V. A. Vedernikov suggested to study foliated formations with directions such that , where and are also some directions, from a unified point of view. We study one-generated factorable foliated formations with directions from the interval [,], where and are the directions of the bicanonical and composition formations, respectively. In particular, all irreducible factorizations of one-generated composition formations are studied. 相似文献