全文获取类型
收费全文 | 282篇 |
免费 | 8篇 |
国内免费 | 1篇 |
专业分类
化学 | 190篇 |
晶体学 | 3篇 |
力学 | 6篇 |
数学 | 31篇 |
物理学 | 61篇 |
出版年
2023年 | 2篇 |
2021年 | 5篇 |
2020年 | 4篇 |
2019年 | 10篇 |
2018年 | 5篇 |
2017年 | 6篇 |
2016年 | 8篇 |
2015年 | 6篇 |
2014年 | 2篇 |
2013年 | 14篇 |
2012年 | 14篇 |
2011年 | 24篇 |
2010年 | 2篇 |
2009年 | 12篇 |
2008年 | 17篇 |
2007年 | 10篇 |
2006年 | 17篇 |
2005年 | 5篇 |
2004年 | 9篇 |
2003年 | 9篇 |
2002年 | 6篇 |
2001年 | 11篇 |
2000年 | 6篇 |
1999年 | 2篇 |
1998年 | 3篇 |
1997年 | 2篇 |
1996年 | 5篇 |
1995年 | 5篇 |
1994年 | 2篇 |
1993年 | 3篇 |
1992年 | 2篇 |
1990年 | 6篇 |
1989年 | 3篇 |
1988年 | 4篇 |
1987年 | 3篇 |
1984年 | 4篇 |
1983年 | 2篇 |
1982年 | 2篇 |
1981年 | 6篇 |
1976年 | 3篇 |
1973年 | 2篇 |
1969年 | 2篇 |
1968年 | 3篇 |
1967年 | 2篇 |
1937年 | 1篇 |
1932年 | 2篇 |
1914年 | 1篇 |
1905年 | 1篇 |
1903年 | 2篇 |
1894年 | 1篇 |
排序方式: 共有291条查询结果,搜索用时 15 毫秒
21.
Režnar Tomáš Martinovič Jan Slaninová Kateřina Grakova Ekaterina Vondrák Vít 《Central European Journal of Operations Research》2017,25(3):545-560
Central European Journal of Operations Research - The probabilistic time-dependent vehicle routing problem is presented in this paper. It is a novel variant of the vehicle routing problem. The... 相似文献
22.
23.
24.
25.
Zorica Marinković Stanojević Z. Branković Z. Jagličić M. Jagodič L. Mančić S. Bernik A. Rečnik G. Branković 《Journal of nanoparticle research》2011,13(8):3431-3439
We have studied the formation of BiMnO3 (BMO) nanocrystalline perovskite powder produced by high-energy milling of the constituent
oxides. The crystal structure and the amount of crystalline and amorphous phases in the powder as a function of the milling
time were determined with XRPD using Rietveld refinement. BMO perovskite formed directly from highly activated nano-sized
constituent oxides after 240 min of milling and subsequently grew during prolonged milling. The morphology, structure, and
chemical composition of the powder were investigated by SEM and TEM. A clear ferromagnetic transition was observed at T
C ~66 K for a sample milled for 240 min and increased with milling time. The magnetic hysteresis behavior is similar to that
of a soft ferromagnet. The magnetic properties of the obtained BMO powders were found to change as a function of milling time
in a manner consistent with variations in the nanocomposite microstructure. 相似文献
26.
Alessandro Lo Giudice Paolo Olivero Claudio Manfredotti Marco Marinelli Enrico Milani Federico Picollo Giuseppe Prestopino Alessandro Re Valentino Rigato Claudio Verona Gianluca Verona‐Rinati Ettore Vittone 《固体物理学:研究快报》2011,5(2):80-82
In order to evaluate the charge collection efficiency (CCE) profile of single‐crystal diamond devices based on a p‐type/intrinsic/metal configuration, a lateral Ion Beam Induced Charge (IBIC) analysis was performed over their cleaved cross sections using a 2 MeV proton microbeam. CCE profiles in the depth direction were extracted from the cross‐sectional maps at variable bias voltage. IBIC spectra relevant to the depletion region extending beneath the frontal Schottky electrode show a 100% CCE, with a spectral resolution of about 1.5%. The dependence of the width of the high efficiency region from applied bias voltage allows the constant residual doping concentration of the active region to be evaluated. The region where the electric field is absent shows an exponentially decreasing CCE profile, from which it is possible to estimate the diffusion length of the minority carriers by means of a drift–diffusion model. (© 2011 WILEY‐VCH Verlag GmbH & Co. KGaA, Weinheim) 相似文献
27.
28.
Harun Re?it Yazar 《Annals of Physics》2006,321(11):2638-2646
In this work, we analyse the positive parity of states of odd-mass nucleus within the framework of interacting boson fermion model. The result of an IBFM-1 multilevel calculation with the lg9/2, 2d5/2, 2d3/2, 3s1/2 and one level, 1h11/2 with negative parity, single particle orbits is reported for the positive parity states of the odd mass nucleus 123-125Te. Also, an IBM-1 calculation is presented for the low-lying states in the even-even 124-126Te core nucleus. The energy levels and B (E2) transition probabilities were calculated and compared with the experimental data. It was found that the calculated positive parity low spin state energy spectra of the odd-mass 123-125Te isotopes agree quite well with the experimental data. 相似文献
29.
The modular software MOLSIM for all‐atom molecular and coarse‐grained simulations is presented with focus on the underlying concepts used. The software possesses four unique features: (1) it is an integrated software for molecular dynamic, Monte Carlo, and Brownian dynamics simulations; (2) simulated objects are constructed in a hierarchical fashion representing atoms, rigid molecules and colloids, flexible chains, hierarchical polymers, and cross‐linked networks; (3) long‐range interactions involving charges, dipoles and/or anisotropic dipole polarizabilities are handled either with the standard Ewald sum, the smooth particle mesh Ewald sum, or the reaction‐field technique; (4) statistical uncertainties are provided for all calculated observables. In addition, MOLSIM supports various statistical ensembles, and several types of simulation cells and boundary conditions are available. Intermolecular interactions comprise tabulated pairwise potentials for speed and uniformity and many‐body interactions involve anisotropic polarizabilities. Intramolecular interactions include bond, angle, and crosslink potentials. A very large set of analyses of static and dynamic properties is provided. The capability of MOLSIM can be extended by user‐providing routines controlling, for example, start conditions, intermolecular potentials, and analyses. An extensive set of case studies in the field of soft matter is presented covering colloids, polymers, and crosslinked networks. © 2015 The Authors. Journal of Computational Chemistry Published by Wiley Periodicals, Inc. 相似文献
30.
Cover Picture: Synthesis of Migrastatin Analogues as Inhibitors of Tumour Cell Migration: Exploring Structural Change in and on the Macrocyclic Ring (Chem. Eur. J. 50/2015)
下载免费PDF全文
![点击此处可从《Chemistry (Weinheim an der Bergstrasse, Germany)》网站下载免费的PDF全文](/ch/ext_images/free.gif)