全文获取类型
收费全文 | 47篇 |
免费 | 0篇 |
国内免费 | 1篇 |
专业分类
化学 | 16篇 |
数学 | 29篇 |
物理学 | 3篇 |
出版年
2021年 | 1篇 |
2018年 | 1篇 |
2016年 | 1篇 |
2015年 | 1篇 |
2013年 | 2篇 |
2012年 | 6篇 |
2010年 | 3篇 |
2009年 | 1篇 |
2007年 | 2篇 |
2003年 | 1篇 |
2002年 | 1篇 |
2000年 | 3篇 |
1997年 | 2篇 |
1994年 | 1篇 |
1993年 | 1篇 |
1990年 | 1篇 |
1989年 | 1篇 |
1987年 | 2篇 |
1986年 | 1篇 |
1984年 | 1篇 |
1981年 | 1篇 |
1980年 | 1篇 |
1979年 | 4篇 |
1978年 | 5篇 |
1977年 | 2篇 |
1975年 | 1篇 |
1973年 | 1篇 |
排序方式: 共有48条查询结果,搜索用时 140 毫秒
1.
Nada Majkić-Singh Milan Konjović Marina Stojanov Slavisa Spasić Ivan Berkeš 《Analytica chimica acta》1981,130(2):419-423
Hydrogen peroxide, the product of diamine oxidase-catalyzed putrescine or cadaverine oxidation, formed in proportion to the enzyme activity, is measured spectrophotometrically by using the above sulfonate (ABTS) and peroxidase. Only one reagent solution containing 3 mmol of putrescine or 10 mmol of cadaverine, 4 mmol of ABTS and 3000 U of peroxidase per litre of 0.2 mol l-1 Tris—0.1 mol l-1 HCl buffer pH 7.5 is needed. Absorbance changes are measured at 410 nm over the first 3 min of the reaction. This initial oxidation rate of the chromogen enables diamine oxidase activity up to 230 U l-1 to be determined. 相似文献
2.
L. Futekov H. Specker und S. Stojanov 《Fresenius' Journal of Analytical Chemistry》1977,285(5):353-355
Zusammenfassung Anhand von Literaturrecherchen aus den Chemical Abstracts der Jahre 1970–1975, ausgewertet nach dem Stichwort Analyse von Selen und Tellur der CID, Berlin, wird die Entwicklung der Analyse der genannten Elemente nach methodischen und nationalen Gesichtspunkten statistisch ausgewertet. Es zeigt sich eine Zunahme der Atomabsorptionsspektroskopie (AAS) und der Röntgenfluorescenzanalyse (RFA), dagegen eine Abnahme photometrischer und fluorimetrischer Methoden. Die jährliche Gesamtzahl der Publikationen auf diesem Gebiet bleibt in dem untersuchten Zeitraum konstant.Wir danken herzlich der Alexander von Humboldt-Stiftung für die Gewährung eines Stipendiums (L. F.). Unser Dank gilt ferner Frau Mischevsska für ihre technische Unterstützung. 相似文献
3.
4.
5.
M. Wanke M. Franz M. Vetterlein G. Pruskil B. Hpfner C. Prohl I. Engelhardt P. Stojanov E. Huwald J.D. Riley M. Dhne 《Surface science》2009,603(17):2808-2814
We report on angle-resolved photoelectron spectroscopy results of thin dysprosium-silicide layers formed on Si(1 1 1), taken with a toroidal analyzer allowing to image the energy surfaces in k||-space. At monolayer dysprosium coverages, where hexagonal DySi2 grows with a 1×1 superstructure, electron pockets are observed at the points with highly anisotropic effective masses, and around a hole pocket at the point also an anisotropic dispersion is found. The band filling of these two bands amounts to one, indicating an even number of electrons assigned to the surface unit cell. Similar features are found for multilayer coverages, where hexagonal Dy3Si5 layers are formed with a superstructure. Here, the influence of zone folding effects due to the reconstructed layers in the bulk silicide is only weak because of the high surface sensitivity of the experiments. 相似文献
6.
JV Georgieva RP Brinkhuis K Stojanov CA Weijers H Zuilhof FP Rutjes D Hoekstra JC van Hest IS Zuhorn 《Angewandte Chemie (International ed. in English)》2012,51(33):8339-8342
A polymeric nanocarrier: Polymersomes tagged with a dodecamer peptide that recognizes gangliosides GM1 and GT1b are shown to cross the blood-brain barrier, both in an in?vitro model and in?vivo. The combination of polymeric vesicles with a small GM1-binding peptide and GM1/GT1b gangliosides as targeting sites for blood-brain barrier transport is unprecedented. 相似文献
7.
Luchezar?L.?Avramov Melvin?Hochster Srikanth?B.?IyengarEmail author Yongwei?Yao 《Mathematische Annalen》2012,353(2):275-291
It is proved that when R is a local ring of positive characteristic, \({\phi\colon R{\to} R}\) is its Frobenius endomorphism, and some non-zero finite R-module has finite flat dimension or finite injective dimension for the R-module structure induced through \({\phi}\) , then R is regular. This broad generalization of Kunz’s characterization of regularity in positive characteristic is deduced from a theorem concerning a local ring R with residue field of k of arbitrary characteristic: If \({\phi}\) is a contracting endomorphism of R, then the Betti numbers and the Bass numbers over \({\phi}\) of any non-zero finitely generated R-module grow at the same rate, on an exponential scale, as the Betti numbers of k over R. 相似文献
8.
We prove converses of the Hochschild-Kostant-Rosenberg Theorem, in particular: If a commutative algebra S is flat and essentially of finite type over a noetherian ring , and the Hochschild homology HH
*
(S|) is a finitely generated S-algebra for shuffle products, then S is smooth over .
Oblatum 27-V-1999 & 27-IX-1999 / Published online: 24 January 2000 相似文献
9.
Luchezar Stoyanov 《Archiv der Mathematik》2018,110(4):391-402
We prove that if two non-trapping obstacles in \(\mathbb {R}^n\) satisfy some rather weak non-degeneracy conditions and the scattering rays in their exteriors have (almost) the same travelling times or (almost) the same scattering length spectrum, then they coincide. 相似文献
10.
We study functors underlying derived Hochschild cohomology, also called Shukla cohomology, of a commutative algebra S essentially of finite type and of finite flat dimension over a commutative noetherian ring K. We construct a complex of S-modules D, and natural reduction isomorphisms for all complexes of S-modules N and all complexes M of finite flat dimension over K whose homology H(M) is finitely generated over S; such isomorphisms determine D up to derived isomorphism. Using Grothendieck duality theory we establish analogous isomorphisms for any essentially finite-type flat map of noetherian schemes, with f!OY in place of D. 相似文献