全文获取类型
收费全文 | 97篇 |
免费 | 4篇 |
专业分类
化学 | 35篇 |
晶体学 | 6篇 |
力学 | 4篇 |
数学 | 23篇 |
物理学 | 33篇 |
出版年
2023年 | 1篇 |
2022年 | 2篇 |
2019年 | 3篇 |
2018年 | 2篇 |
2016年 | 3篇 |
2015年 | 1篇 |
2014年 | 4篇 |
2013年 | 2篇 |
2012年 | 3篇 |
2011年 | 2篇 |
2010年 | 4篇 |
2009年 | 2篇 |
2008年 | 3篇 |
2007年 | 2篇 |
2005年 | 2篇 |
2004年 | 4篇 |
2003年 | 3篇 |
2002年 | 1篇 |
2000年 | 5篇 |
1999年 | 1篇 |
1998年 | 1篇 |
1996年 | 1篇 |
1994年 | 2篇 |
1992年 | 2篇 |
1991年 | 3篇 |
1990年 | 4篇 |
1988年 | 1篇 |
1986年 | 3篇 |
1985年 | 1篇 |
1983年 | 2篇 |
1982年 | 3篇 |
1981年 | 2篇 |
1980年 | 3篇 |
1979年 | 1篇 |
1977年 | 1篇 |
1976年 | 3篇 |
1975年 | 2篇 |
1973年 | 3篇 |
1968年 | 1篇 |
1966年 | 1篇 |
1962年 | 1篇 |
1950年 | 1篇 |
1946年 | 1篇 |
1943年 | 1篇 |
1942年 | 1篇 |
1941年 | 1篇 |
1940年 | 1篇 |
1923年 | 1篇 |
1885年 | 2篇 |
1884年 | 1篇 |
排序方式: 共有101条查询结果,搜索用时 15 毫秒
1.
2.
A pair of coupled classical oscillators with a general potential and general form of coupling is investigated. For general
potentials, the single-frequency solution is shown to be stable for small excitations. For special potentials, such system
remains stable for an arbitrary excitation. In both cases, the stability does not depend on the form of coupling. Transition
to the instability regime follows from the way how nonlinear potential entrains the energy transfer between the oscillators.
Relation between the existence of multi-frequency quasi-periodic or periodic solutions and the instability of single-frequency
ones is discussed. 相似文献
3.
Jochen Alber Jií Fiala 《Journal of Algorithms in Cognition, Informatics and Logic》2004,52(2):134-151
We consider the parameterized problem, whether for a given set
of n disks (of bounded radius ratio) in the Euclidean plane there exists a set of k non-intersecting disks. For this problem, we expose an algorithm running in time
that is—to our knowledge—the first algorithm with running time bounded by an exponential with a sublinear exponent. For λ-precision disk graphs of bounded radius ratio, we show that the problem is fixed parameter tractable with a running time
. The results are based on problem kernelization and a new “geometric (
-separator) theorem” which holds for all disk graphs of bounded radius ratio. The presented algorithm then performs, in a first step, a “geometric problem kernelization” and, in a second step, uses divide-and-conquer based on our new “geometric separator theorem.” 相似文献
4.
Tetsuo Hiramoto Masanobu Nishii Vladimir Fiala Hitoshi Yamaoka 《Journal of polymer science. Part A, Polymer chemistry》1973,11(9):2257-2263
Radiation-induced solid-state polymerization of cyclohexene sulfide has been investigated. Differential thermal analysis shows that this compound has a phase transition point at ?74°C and behaves as a plastic crystal in the temperature range from ?74 to ?20°C (melting point). By rapid cooling, this plastic crystal was easily supercooled, and below ?166°C a glassy crystal, i.e., a supercooled nonequilibrium state of plastic crystal, was obtained. In-source polymerization proceeded in the plastic crystalline state. Postpolymerization of glassy crystalline monomer irradiated at ?196°C occurred above ?166°C (glass transition point) during subsequent heating. 相似文献
5.
6.
Peter Roschger Werner Fiala Wolfgang Stadlbauer 《Journal of heterocyclic chemistry》1992,29(1):225-231
4-Chloro-3-nitro-2-quinolones 3 obtained from the 4-hydroxy quinolones 1 by nitration and chlorination, reacted with sodium azide to the 4-azido derivatives 4 which cyclized on thermolysis to yield the furoxanes 5 . Nucleophilic substitution reactions of 3 led to the 4-amino-, 4-fluoro- and 4-alkoxy-3-nitroquinolones 7, 8 and 9 , respectively. With thiols either 4-thio-3-nitro- 10 or 3,4-dithioquinolones 11 were obtained depending on the basic catalyst. 相似文献
7.
Let X = {x1, x2,…} be a finite set and associate to every xi a real number αi. Let f(n) [g (n)] be the least value such that given any family of subsets of X having maximum degree n [cardinality n], one can find integers αi, i=1,2,… so that αi ? αi|<1 and for all . We prove . 相似文献
8.
9.
The separation of 1,2-dimethylhydrazine, azomethane, azoxymethane, methylazoxymethanol, methylazoxymethanol acetate, formaldehyde and methanol by high-pressure liquid chromatography on columns of C18/Corasil, muBondapak C18 and Aminex A-27 is described. The separations are highly reproducible and rapid and may be used for kinetic studies. An example of an application of these methods to the analysis of metabolites in rat urine derived from (14C)-1,2-dimethylhydrazine is reported. 相似文献
10.
Present article is devoted to the pursuit of excitation spectra and of thermal dependencies of emission spectra of photoluminescence of pure samples of AgCl during the preparation and/or annealing in argon, air, oxygen or HG1. Differences of luminescence properties of different samples are explained by the existence of different surface luminescence centres created during the preparation of samples. 相似文献