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121.
In this paper, we consider an adaptive meshing scheme for solution of the steady incompressible Navier–Stokes equations by finite element discretization. The mesh refinement and optimization are performed based on an algorithm that combines the so‐called conforming centroidal Voronoi Delaunay triangulations (CfCVDTs) and residual‐type local a posteriori error estimators. Numerical experiments in the two‐dimensional space for various examples are presented with quadratic finite elements used for the velocity field and linear finite elements for the pressure. The results show that our meshing scheme can equally distribute the errors over all elements in some optimal way and keep the triangles very well shaped as well at all levels of refinement. In addition, the convergence rates achieved are close to the best obtainable. Extension of this approach to three‐dimensional cases is also discussed and the main challenge is the efficient implementation of three‐dimensional CfCVDT generation that is still under development. Copyright © 2007 John Wiley & Sons, Ltd. 相似文献
122.
研制半自动定容试液,半自动定位恒速注入KBK4,整个氢化过程不串空气,可用压力全方位喷射冲洗反应室。该装置定容定位准确,操作简便快速,适用于大批量样品分析。通过对8个GSD标准参考物质的分析,分析结果与参考值基本一致,RSD<6%。 相似文献
123.
Solvothermal synthesis of CdS nanowires using L-cysteine as sulfur source and their characterization
Hongde Gai Youshi Wu Lili Wu Zhigang Wang Yuanchang Shi Min Jing Ke Zou 《Applied Physics A: Materials Science & Processing》2008,91(1):69-72
An effective solvothermal reaction route has been developed for large-scale synthesis of CdS nanowires. L-cysteine was used
as both sulfur source and capping reagent. The nanowires obtained were characterized by XRD, SEM, TEM, HRTEM, UV-Vis and PL.
On the basis of time-resolved experiments, a possible growth mechanism was proposed. FTIR analysis confirmed the formation
of Cd-cysteine complex and peptide during the reaction. The mechanism was further supported by comparative experiments with
other sulfur sources.
Electronic supplementary material The online version of this article (doi: ) contains supplementary material, which is available to authorized users.
PACS 81.05.Bx; 81.07.-b; 81.07.BC; 81.07.Vb; 81.10.Dn 相似文献
124.
Hongtao Sun Liyan Zhang Shilong Zhao Junjie Zhang Dongbing He Zhongchao Duan Lili Hu 《Solid State Communications》2005,133(6):357-361
Structural and infrared-to-visible upconversion fluorescence properties of Er3+/Yb3+-codoped oxychloride lead-germanium-bismuth glass have been studied. The Raman spectrum investigation indicates that PbCl2 plays an important role in the formation of glass network, and has an important influence on the upconversion luminescence owing to lower phonon energy. Intense green and red emissions centered at 525, 546, and 657 nm, corresponding to the transitions 2H11/2→4I15/2, 4S3/2→4I15/2, and 4F9/2→4I15/2, respectively, were observed at room temperature. The quadratic dependence of the 525, 546, and 657 nm emissions on excitation power indicates that a two-photon absorption process occurs under 975 nm excitation. 相似文献
125.
126.
In this paper the numerical approximations of the Ginzburg- Landau model for a superconducting hollow spheres are constructed using a gauge invariant discretization on spherical centroidal Voronoi tessellations. A reduced model equation is used on the surface of the sphere which is valid in the thin spherical shell limit. We present the numerical algorithms and their theoretical convergence as well as interesting numerical results on the vortex configurations. Properties of the spherical centroidal Voronoi tessellations are also utilized to provide a high resolution scheme for computing the supercurrent and the induced magnetic field.
127.
Xiaogang Yang Dongsheng Li Feng Fu Long Tang Jiyuan Yang Lili Wang Yaoyu Wang 《无机化学与普通化学杂志》2008,634(14):2634-2638
The reaction of ZnII nitrate with maleic acid (H2mal) / fumaric acid (H2fum) and 4,4′‐dipyridyl disulfide (4‐pds) resulted under same conditions in two distinct interpenetrated compounds, namely [Zn(4‐dps)2(H2O)2]·2Hmal ( 1 ) and [Zn(4‐dps)(fum)] ( 2 ). In 1 , Hmal anion adopts bridging mode based on hydrogen bonding, affording a 2‐fold parallel interpenetrated 3D→3D α‐Po net hydrogen‐bonded framework, in which 1D double‐stranded chains are formed, and then extended to a 3D supramolecular architecture combining second‐sphere hydrogen‐bonded interactions. For 2 , fum dianion takes on bis‐dentate bridging coordination fashion, furnishing a 2‐fold interpenetrated 2D→2D (4,4) layered coordination network, in which the tetrahedral ZnII atoms are interlinked by 4‐dps and fum. Additionally, the compound 2 shows strong fluorescence in the solid state at room temperature. 相似文献
128.
Junrui Duan Jie Ji Lili Ye Yitong Zhai Lidong Zhang 《Proceedings of the Combustion Institute》2021,38(1):681-689
The low-temperature oxidation mechanism of n?butyl radicals (n-C4H9) has been investigated by high level quantum chemical calculations coupled with the Rice–Ramsperger–Kassel–Marcus/Master Equation (RRKM/ME) theory. The potential energy surfaces (PES) were explored at the QCISD(T)/CBS//B3LYP/6-311++G(d,p) level. The temperature- and pressure-dependent rate constants were computed and fitted in modified Arrhenius parameters. The major reaction channels were discussed to more deeply understand the competing relationships between chain branching, chain propagation and termination reactions. The results show that the 1,5 H-shift reaction is more competitive than the 1,6 H-shift and 1,4 H-shift for isomerization reactions of n?butyl peroxy radicals, and the concerted HO2 elimination channel to form butene becomes more important at high temperatures. Furthermore, based on our calculations, a revised kinetic model was developed to describe n-butane oxidation. Good consistency between model predictions and experimental data was shown. This study enhances our understanding of the combustion mechanism of n-butane and can be used as a reliable reference for mechanistic understanding of larger alkanes. 相似文献
129.
130.
Lili Zhu Xiaodan Chen Qihua Zhao Zhongshu Li Xiangyang Zhang Baiwang Sun Prof. Dr. 《无机化学与普通化学杂志》2010,636(8):1441-1443
The novel heterospin complex [Ni2(PhCOO)4(NITpPy)2]·2CH3CN ( 1 ) was synthesized by the reaction of nickel benzoate and 2‐(4‐pyridyl)‐4,4,5,5‐tetramethylimidazoline‐1‐oxyl‐3‐oxide (NITpPy) in acetonitrile and dichloromethane solutions. The X‐ray structure determination shows that complex 1 consists of a symmetrical dimeric NiII benzoate paddle‐wheel core and pyridyl nitrogen atoms of radical ligands at the apical position, in addition, the temperature (2–300K) dependent magnetic susceptibility measurements indicate that 1 has antiferromagnetic behavior. 相似文献