全文获取类型
收费全文 | 109篇 |
免费 | 4篇 |
国内免费 | 4篇 |
专业分类
化学 | 57篇 |
力学 | 5篇 |
数学 | 33篇 |
物理学 | 22篇 |
出版年
2022年 | 2篇 |
2021年 | 1篇 |
2020年 | 5篇 |
2019年 | 2篇 |
2018年 | 2篇 |
2017年 | 1篇 |
2016年 | 6篇 |
2015年 | 5篇 |
2014年 | 7篇 |
2013年 | 10篇 |
2012年 | 11篇 |
2011年 | 6篇 |
2010年 | 4篇 |
2009年 | 7篇 |
2008年 | 8篇 |
2007年 | 5篇 |
2006年 | 4篇 |
2005年 | 8篇 |
2004年 | 4篇 |
2003年 | 2篇 |
2002年 | 4篇 |
2001年 | 2篇 |
2000年 | 1篇 |
1999年 | 1篇 |
1998年 | 1篇 |
1997年 | 1篇 |
1996年 | 1篇 |
1995年 | 1篇 |
1990年 | 1篇 |
1989年 | 1篇 |
1985年 | 1篇 |
1983年 | 1篇 |
1979年 | 1篇 |
排序方式: 共有117条查询结果,搜索用时 218 毫秒
41.
Theodoros Vlachos 《manuscripta mathematica》2003,110(1):77-91
We show that minimal surfaces in space forms are determined, up to ambient isometries, by the induced metric and certain
invariants which are defined in terms of the higher fundamental forms and the complex structure.
Received: 6 May 2002 / Revised version: 5 July 2002
Current address: Institut für Mathematik, Universit?t Augsburg, Universit?tsstrasse 12, D-86135 Augsburg, Germany. e-mail: Theodoros.Vlachos@Math.Uni-Augsburg.De
The author was supported by the Alexander von Humboldt Foundation
Mathematics Subject Classification (2000): 53A10, 53C42
Acknowledgements. This work was written during the author's stay at the University of Augsburg as a research fellow of the Alexander von Humboldt
Foundation. I wish to express my gratitude to the Alexander von Humboldt Foundation for its generous support. Moreover, I
wish to thank Professor J.H. Eschenburg for many fruitful and stimulating conversations. 相似文献
42.
Manuel Mönnich Dr. Steffen Eller Theodoros Karagiannis Lukas Perkams Thomas Luber Dr. Dimitri Ott Dr. Mathäus Niemietz Dr. Joanna Hoffman Janika Walcher Lukas Berger Dr. Matthias Pischl Markus Weishaupt Cathrin Wirkner Prof. Rachel G. Lichtenstein Prof. Carlo Unverzagt 《Angewandte Chemie (International ed. in English)》2016,55(35):10487-10492
The occurrence of N‐glycans with a bisecting GlcNAc modification on glycoproteins has many implications in developmental and immune biology. However, these particular N‐glycans are difficult to obtain either from nature or through synthesis. We have developed a flexible and general method for synthesizing bisected N‐glycans of the complex type by employing modular TFAc‐protected donors for all antennae. The TFAc‐protected N‐glycans are suitable for the late introduction of a bisecting GlcNAc. This integrated strategy permits for the first time the use of a single approach for multiantennary N‐glycans as well as their bisected derivatives via imidates, with unprecedented yields even in a one‐pot double glycosylation. With this new method, rare N‐glycans of the bisected type can be obtained readily, thereby providing defined tools to decipher the biological roles of bisecting GlcNAc modifications. 相似文献
43.
Theodoros Vlachos 《manuscripta mathematica》2016,150(1-2):73-98
44.
Tsoufis T Colomer JF Maccallini E Jankovič L Rudolf P Gournis D 《Chemistry (Weinheim an der Bergstrasse, Germany)》2012,18(30):9305-9311
Rhomboidal and spherical metallic-copper nanostructures were encapsulated within well-formed graphitic shells by using a simple chemical method that involved the catalytic decomposition of acetylene over a copper catalyst that was supported on different smectite clays surfaces by ion-exchange. These metallic-copper nanostructures could be separated from the inorganic support and remained stable for months. The choice of the clay support influenced both the shape and the size of the synthesized Cu nanostructures. The synthesized materials and the supported catalysts from which they were produced were studied in detail by TEM and SEM, powder X-ray diffraction, thermal analysis, as well as by Raman and X-ray photoelectron spectroscopy. 相似文献
45.
Andreas Sofetis Fotini Fotopoulou Catherine P. Raptopoulou Theodoros F. Zafiropoulos Spyros P. Perlepes Nikolaos Klouras 《Polyhedron》2009
The reaction of [TiIV(Cp)2Cl2] (Cp− = η5-C5H5−) and 2,6-bis(3,5-dimethylpyrazolyl-1-yl)pyridine (bdmpp) in Me2CO has afforded complex [TiIVCl2(O2)(bdmpp)] (1). The complex can also be prepared from the 1:1:1 [Ti(Cp)2Cl2]/bdmpp/H2O2 reaction mixture in various solvents. Single-crystal, X-ray crystallography has revealed that the TiIV center is in a distorted pentagonal bipyramidal environment in both of the two, crystallographically independent molecules that are present in the asymmetric unit; the equatorial positions are occupied by the two O atoms of the side-on (η2) O22− group and the three N-atoms of the tridentate chelate, while the two chloro ligands are on the axial positions. IR, Raman, electronic and 1H NMR data are discussed in terms of the known structure and the coordination modes of the peroxo and bdmpp ligands. 相似文献
46.
Gemma M. Rodríguez-Muiz Theodoros Mikroulis Anna Pantelia Georgios Rotas Maria-Consuelo Cuquerella Georgios C. Vougioukalakis Miguel A. Miranda 《Molecules (Basel, Switzerland)》2022,27(4)
Mitochondria-targeting drugs and diagnostics are used in the monitoring and treatment of mitochondrial pathologies. In this respect, a great number of functional compounds have been made mitotropic by covalently attaching the active moiety onto a triphenylphosphonium (TPP) cation. Among these compounds, a number of molecular detectors for reactive oxygen species (ROS) are based on fluorescent and chemiluminescent probes. In this regard, luminol (probably the most widely known chemiluminescent molecule) has been employed for a number of biological applications, including ROS detection. Its oxidation under specific conditions triggers a cascade of reactions, ultimately leading to the excited 3-aminophthalate (3AP *), which emits light upon deactivation. Hence, the photophysical interaction between the light-emitting species 3AP * and TPP cations needs to be evaluated, as it can add valuable information on the design of novel emission-based mitotropic systems. We herein investigate the quenching effect of ethyltriphenylphosphonium cation onto substituted 3-aminophthalates. These were prepared in situ upon hydrolysis of the corresponding anhydrides, which were synthesized from 3-aminophthalimides. Steady-state fluorescence and time-resolved experiments were employed for the evaluation of a possible electron transfer quenching by phosphonium ions. Our experimental results confirmed such quenching, suggesting it is mainly dynamic in nature. A minor contribution of static quenching that was also detected is attributed to complex formation in the ground state. Accordingly, the chemiluminescence of luminol was indeed strongly reduced in the presence of phosphonium ions. Our results have to be taken into account during the design of new chemiluminescent mitotropic drugs or diagnostic agents of the luminol family. 相似文献
47.
48.
Elias A. Couladouros Zoi F. Plyta Theodoros Iliadis Vassilios Roussis Vassilios P. Papageorgiou 《Journal of heterocyclic chemistry》1996,33(3):709-714
Heterocyclic derivatives of naphthoquinones were synthesized via their 2-bromo-2,3-dehydro-intermediates. This new route may lead to the formation of benzo[a]phenothiazin-5-ones, benzo[f]quinoxalin-6-ones as well as their 1,4 (or 7,10) dihydroxy-derivatives in high yields. The possible mechanisms involved in the formation of these compounds are discussed. 相似文献
49.
Spyros P. Perlepes Theodoros F. Zafiropoulos Dimitris Raptis Andreas G. Galinos 《Monatshefte für Chemie / Chemical Monthly》1983,114(12):1355-1358
New complexes of the general types HCo(NCS)3 ·nL, HCoX 2(NCS) ·nL and HCo(NCS)2I ·nL (whereX=Cl, Br, I;L=diethyl ether, pyridine, aniline;n=1.5, 2, 3, 3.5) have been prepared and characterized. The magnetic and spectroscopic data indicate that pseudotetrahedral [Co(NCS)3 L]?, [CoX 2(NCS)L]? and [Co(NCS)2IL]? anions are present in the solid pyridine and aniline compounds. 相似文献
50.
Nikolaos D. Atreas Manos Papadakis Theodoros Stavropoulos 《Journal of Fourier Analysis and Applications》2016,22(4):854-877
In this work we prove that any pair of homogeneous dual multiwavelet frames of \(L_2(\mathbb {R}^s)\) constructed from a pair of refinable function vectors gives rise to a pair of nonhomogeneous dual multiwavelet frames and vice versa. We also prove that the Mixed Oblique Extension Principle characterizes dual multiwavelet frames. Our results extend recent characterizations of affine dual frames derived from scalar refinable functions obtained in [3]. 相似文献