全文获取类型
收费全文 | 898篇 |
免费 | 34篇 |
国内免费 | 6篇 |
专业分类
化学 | 523篇 |
晶体学 | 12篇 |
力学 | 19篇 |
数学 | 152篇 |
物理学 | 232篇 |
出版年
2022年 | 8篇 |
2021年 | 14篇 |
2020年 | 12篇 |
2019年 | 8篇 |
2018年 | 10篇 |
2017年 | 23篇 |
2016年 | 22篇 |
2015年 | 21篇 |
2014年 | 23篇 |
2013年 | 37篇 |
2012年 | 43篇 |
2011年 | 38篇 |
2010年 | 25篇 |
2009年 | 28篇 |
2008年 | 34篇 |
2007年 | 36篇 |
2006年 | 38篇 |
2005年 | 28篇 |
2004年 | 20篇 |
2003年 | 33篇 |
2002年 | 24篇 |
2001年 | 21篇 |
2000年 | 19篇 |
1999年 | 16篇 |
1998年 | 8篇 |
1997年 | 13篇 |
1994年 | 9篇 |
1993年 | 12篇 |
1992年 | 11篇 |
1990年 | 8篇 |
1989年 | 8篇 |
1988年 | 9篇 |
1986年 | 10篇 |
1984年 | 11篇 |
1983年 | 9篇 |
1982年 | 11篇 |
1981年 | 10篇 |
1978年 | 8篇 |
1971年 | 6篇 |
1968年 | 6篇 |
1966年 | 6篇 |
1965年 | 6篇 |
1933年 | 6篇 |
1932年 | 6篇 |
1930年 | 7篇 |
1929年 | 6篇 |
1927年 | 8篇 |
1925年 | 7篇 |
1924年 | 10篇 |
1923年 | 8篇 |
排序方式: 共有938条查询结果,搜索用时 15 毫秒
1.
Dr. James Moser 《Monatshefte für Chemie / Chemical Monthly》1886,7(1):273-279
Ohne Zusammenfassung 相似文献
2.
Reaction diffusion systems on cylindrical domains with terms that vary rapidly and periodically in the unbounded direction can be analyzed by averaging techniques. Here, using iterated normal form transformations and Gevrey regularity of bounded solutions, we prove a result on exponential averaging for such systems, i.e., we show that traveling wave solutions can be described by a spatially homogenous equation and exponentially small remainders. (© 2007 WILEY‐VCH Verlag GmbH & Co. KGaA, Weinheim) 相似文献
3.
W. Potzel J. Moser Ulrike Potzel F. J. Litterst G. M. Kalvius J. Gal M. Boge J. Chappert J. Spirlet 《Hyperfine Interactions》1987,34(1-4):391-405
Due to the wider radial extent of 5f electrons when compared to their 4f counterparts, intermetallics of the light actinides show a broad spectrum of magnetic properties ranging from the localized magnetism of the lanthanides to the itinerant magnetism often found in transition metal compounds. One parameter which strongly influences the magnetic character of the compound is the actinide-actinide separation which can experimentally be varied by the application of high pressure. The question of 5f electron delocalization will be reviewed with respect to Moesshauer high pressure data on NpCo2si2, NpAl2, NpOs2 and new results will be presented of NpAs. The connection of hyperfine parameters with results of X-ray diffraction studies will be discussed.Work supported by the Bundesministerium für Forschung und Technologie, Federal Republic of Germany 相似文献
4.
Ohne ZusammenfassungDie vorliegende Untersuchung wurde im Laboratorium für allgemeine Experimentalchemie und in jenem für analytische Chemie an der technischen Hochschule in Wien durchgeführt. Es ist uns eine angenehme Pflicht, den Vorständen dieser Institute, den Herren Professoren Dr. M. Bamberger und Dr. G. Vortmann für ihr stetes Entgegenkommen unseren wärmsten Dank zu sagen. 相似文献
5.
Ludwig Moser und Wilhelm Reif 《Mikrochimica acta》1930,8(1):215-218
Ohne Zusammenfassung 相似文献
6.
Summary The detachment of a rubber matrix from a rigid inclusion under monotonic loading and at subsequent relaxation is investigated within two dimensional analysis. Examined are stress–strain experimental data acquired with the help of a test bed equipped with a digital image-acquisition device. The influence of the interfacial bonding strength and the particle size on the detachment process is analyzed. The influence of the interfacial bonding strength is visible in the stress–strain diagram of loading and in the recorded images. The relaxation test reveals no influence of the bonding strength on the stress-relaxation. However, the image analysis indicates a secondary transient creep of the contour of detachment, which depends on the interfacial bonding. 相似文献
7.
8.
The Lombardo–Imbihl–Fink (LFI) ODE model of the NO+NH3 reaction on a Pt(1 0 0) surface shows stable relaxation oscillations with very sharp transitions for temperatures T between 404 and 433 K. Here we study numerically the effect of linear diffusive coupling of these oscillators in one spatial dimension. Depending on the parameters and initial conditions we find a rich variety of spatio-temporal patterns which we group into four main regimes: bulk oscillations (BOs), standing waves (SW), phase clusters (PC), and phase waves (PW). Two key ingredients for SW and PC are identified, namely the relaxation type of the ODE oscillations and a nonlocal (and nonglobal) coupling due to relatively fast diffusion of the kinetically slaved variables NH3 and H. In particular, the latter replaces the global coupling through the gas phase used to obtain SW and PC in models of related surface reactions. The PW exist only under the assumption of (relatively) slow diffusion of NH3 and H. 相似文献
9.
10.
Nusbaumer H Zakeeruddin SM Moser JE Grätzel M 《Chemistry (Weinheim an der Bergstrasse, Germany)》2003,9(16):3756-3763
A series of new cobalt complexes [Co(LLL)(2)X(2)] were synthesized and evaluated as redox mediators for dye-sensitized nanocrystalline TiO(2) solar cells. The structure of the ligand and the nature of the counterions were found to influence the photovoltaic performance. The one-electron-transfer redox mediator [Co(dbbip)(2)](ClO(4))(2) (dbbip = 2,6-bis(1'-butylbenzimidazol-2'-yl)pyridine) performed best among the compounds investigated. Photovoltaic cells incorporating this redox mediator yielded incident photon-to-current conversion efficiencies (IPCE) of up to 80%. The overall yield of light-to-electric power conversion reached 8 % under simulated AM1.5 sunlight at 100 W m(-2) intensity and more than 4% at 1000 W m(-2). Photoelectrodes coated with a 2 microm thick nanoporous layer and a 4 microm thick light-scattering layer, sensitized with a hydrophobic ruthenium dye, gave the best results. 相似文献