全文获取类型
收费全文 | 136篇 |
免费 | 13篇 |
国内免费 | 2篇 |
专业分类
化学 | 109篇 |
力学 | 2篇 |
数学 | 12篇 |
物理学 | 28篇 |
出版年
2021年 | 2篇 |
2019年 | 2篇 |
2017年 | 1篇 |
2016年 | 2篇 |
2015年 | 10篇 |
2014年 | 8篇 |
2013年 | 10篇 |
2012年 | 8篇 |
2011年 | 9篇 |
2010年 | 1篇 |
2009年 | 2篇 |
2008年 | 6篇 |
2007年 | 7篇 |
2006年 | 5篇 |
2005年 | 7篇 |
2004年 | 3篇 |
2003年 | 5篇 |
2002年 | 4篇 |
2001年 | 3篇 |
2000年 | 3篇 |
1999年 | 3篇 |
1998年 | 2篇 |
1997年 | 4篇 |
1996年 | 1篇 |
1994年 | 2篇 |
1993年 | 1篇 |
1992年 | 3篇 |
1990年 | 1篇 |
1989年 | 3篇 |
1988年 | 1篇 |
1987年 | 2篇 |
1985年 | 1篇 |
1984年 | 1篇 |
1983年 | 1篇 |
1981年 | 1篇 |
1979年 | 1篇 |
1978年 | 1篇 |
1977年 | 3篇 |
1976年 | 4篇 |
1975年 | 1篇 |
1974年 | 2篇 |
1973年 | 1篇 |
1968年 | 1篇 |
1962年 | 2篇 |
1961年 | 3篇 |
1959年 | 1篇 |
1956年 | 1篇 |
1935年 | 2篇 |
1920年 | 1篇 |
1909年 | 1篇 |
排序方式: 共有151条查询结果,搜索用时 31 毫秒
1.
We characterize cardinalsκ such that 2λ = 2κ wheneverκ ≦λ < 2κ using ideals in small algebras of sets satisfying certain completeness and saturation conditions.
Research of this author was supported by an NSF Grant. 相似文献
2.
The synthesis, characterisation and polymerisation studies of a homologous series of α,ω-bis(pyrrolyl)alkanes are described. These α,ω-bis(pyrrolyl)alkanes were produced using Friedel-Crafts acylation followed by reduction of the carbonyl group using Red-Al®. Chemical polymerisation of the resultant dimers using FeCl3 produced poly(α,ω-bis(pyrrolyl)alkane) films, which were characterised by SEM, FTIR and tested for conductivity. 相似文献
3.
Berger A Djukic JP Pfeffer M de Cian A Kyritsakas-Gruber N Lacour J Vial L 《Chemical communications (Cambridge, England)》2003,(5):658-659
In the presence of large amounts of [Me4N]Cl, the reaction of ortho-chloromercurated 2-[(eta6-phenyl)tricarbonylchromium]pyridine with mu-chloro cyclopalladated aromatic compounds yields a series of new heteroleptic heterodinuclear cis-(C--N)2Pd(II) complexes, which are valuable precursors of planar chiral cyclopalladated (eta6-arene)Cr(CO)3 complexes. 相似文献
4.
Carbon disulfide reacts with the α-anions of carboxylate salts and esters to form intermediate salts, provides a new pathway to two classes of compounds: dithioesters and ketene mercaptals. The reaction produced the first carboxylated derivatives of dithioesters and ketene mercaptals. Examples of 2-carboxylated dithioesters and ketene mercaptals as well as their decarboxylated derivatives have been prepared and characterized. 相似文献
5.
Cover Picture: Monitoring Conformational Changes in the NDM‐1 Metallo‐β‐lactamase by 19F NMR Spectroscopy (Angew. Chem. Int. Ed. 12/2014) 下载免费PDF全文
6.
7.
de Cian A Djukic JP Fischer J Pfeffer M Dötz KH 《Chemical communications (Cambridge, England)》2002,(6):638-639
The reactions of bis-cyclomanganated 2,3-diphenylquinoxaline with diazodiphenylmethane and 9-diazofluorene allowed the formation of a new oligomeric and dinuclear manganospiralene and the ready preparation of a pentacyclic helix comprising two (eta 5-fluorenyl)Mn(CO)3 fragments, whose helicity can be locked upon one-dimensional linear coordination to silver cation. 相似文献
8.
Otto M Schirmer A Claussnitzer U Pfeffer M 《Analytical and bioanalytical chemistry》2002,372(2):341-346
Optimisation of the separation of a synthetic drug mixture by HPLC is performed by changing both continuous variables, i.e. mobile phase composition and temperature, and categorical variables, here the stationary phase. The retention of solutes is described on the basis of a general linear model in which the different columns are modelled by indicator variables. From the solute-specific retention models the global separation optimum is evaluated on the basis of multidimensional window diagrams using relative retentions of all peak pairs as the figure-of-merit. 相似文献
9.
Jean-Pierre Djukic Michel Pfeffer Nathalie Gruber-Kyritsakas André de Cian 《Journal of organometallic chemistry》2011,696(20):3268-3273
A Mn(I) tricarbonyl complex of a 1,3-diferrocenyl-1-oxopentadienyl ligand was synthesised adventitiously by what seems to be an in-situ aldol-like condensation of two acetylferrocene units promoted by benzyl-Mn(CO)5. X-ray structural analysis of this unexpected product confirms the η5 coordination of the 1,3-diferrocenyl-1-oxopentadienyl ligand to the Mn(CO)3 moiety. The nature of the metal-ligand bonding relationship was studied by theoretical calculations; it outlines the charge unbalance (polarisation) at the oxopentadienyl moiety as well as the lack of ketone character of the latter Mn-bound ligand. 相似文献
10.
Washek F. Pfeffer 《Rendiconti del Circolo Matematico di Palermo》1987,36(3):482-506
In a self-contained presentation aimed to non-specialists, we discuss the recent development of a new, well behaved, Riemann type integral on differentiable manifolds with respect to which the exterior derivative of any differentiable form is integrable and the Stokes formula holds. 相似文献