首页 | 本学科首页   官方微博 | 高级检索  
文章检索
  按 检索   检索词:      
出版年份:   被引次数:   他引次数: 提示:输入*表示无穷大
  收费全文   10502篇
  免费   1313篇
  国内免费   947篇
化学   4058篇
晶体学   55篇
力学   1114篇
综合类   167篇
数学   3970篇
物理学   3398篇
  2024年   16篇
  2023年   101篇
  2022年   155篇
  2021年   237篇
  2020年   309篇
  2019年   312篇
  2018年   313篇
  2017年   381篇
  2016年   385篇
  2015年   331篇
  2014年   498篇
  2013年   1004篇
  2012年   579篇
  2011年   588篇
  2010年   497篇
  2009年   614篇
  2008年   631篇
  2007年   596篇
  2006年   556篇
  2005年   527篇
  2004年   481篇
  2003年   482篇
  2002年   399篇
  2001年   345篇
  2000年   319篇
  1999年   274篇
  1998年   281篇
  1997年   226篇
  1996年   194篇
  1995年   152篇
  1994年   128篇
  1993年   106篇
  1992年   97篇
  1991年   83篇
  1990年   89篇
  1989年   68篇
  1988年   43篇
  1987年   46篇
  1986年   44篇
  1985年   52篇
  1984年   32篇
  1983年   15篇
  1982年   39篇
  1981年   16篇
  1980年   23篇
  1979年   21篇
  1978年   14篇
  1977年   16篇
  1976年   16篇
  1972年   10篇
排序方式: 共有10000条查询结果,搜索用时 15 毫秒
1.
2.
In this paper we consider minimizers of the functionalmin{λ1(Ω)++λk(Ω)+Λ|Ω|,:ΩD open} where DRd is a bounded open set and where 0<λ1(Ω)λk(Ω) are the first k eigenvalues on Ω of an operator in divergence form with Dirichlet boundary condition and with Hölder continuous coefficients. We prove that the optimal sets Ω have finite perimeter and that their free boundary ΩD is composed of a regular part, which is locally the graph of a C1,α-regular function, and a singular part, which is empty if d<d, discrete if d=d and of Hausdorff dimension at most dd if d>d, for some d{5,6,7}.  相似文献   
3.
《Discrete Mathematics》2020,343(2):111679
A path in an edge-colored graph G is called monochromatic if any two edges on the path have the same color. For k2, an edge-colored graph G is said to be monochromatic k-edge-connected if every two distinct vertices of G are connected by at least k edge-disjoint monochromatic paths, and G is said to be uniformly monochromatic k-edge-connected if every two distinct vertices are connected by at least k edge-disjoint monochromatic paths such that all edges of these k paths are colored with a same color. We use mck(G) and umck(G) to denote the maximum number of colors that ensures G to be monochromatic k-edge-connected and, respectively, G to be uniformly monochromatic k-edge-connected. In this paper, we first conjecture that for any k-edge-connected graph G, mck(G)=e(G)e(H)+k2, where H is a minimum k-edge-connected spanning subgraph of G. We verify the conjecture for k=2. We also prove the conjecture for G=Kk+1 and G=Kk,n with nk3. When G is a minimal k-edge-connected graph, we give an upper bound of mck(G), i.e., mck(G)k1. For the uniformly monochromatic k-edge-connectivity, we prove that for all k, umck(G)=e(G)e(H)+1, where H is a minimum k-edge-connected spanning subgraph of G.  相似文献   
4.
Doxorubicin (DOX), a recognized anticancer drug, forms stable associations with carbon nanotubes (CNTs). CNTs when properly functionalized have the ability to anchor directly in cancerous tumors where the release of the drug occurs thanks to the tumor slightly acidic pH. Herein, we study the armchair and zigzag CNTs with Stone–Wales (SW) defects to rank their ability to encapsulate DOX by determining the DOX-CNT binding free energies using the MM/PBSA and MM/GBSA methods implemented in AMBER16. We investigate also the chiral CNTs with haeckelite defects. Each haeckelite defect consists of a pair of square and octagonal rings. The armchair and zigzag CNT with SW defects and chiral nanotubes with haeckelite defects predict DOX-CNT interactions that depend on the length of the nanotube, the number of present defects and nitrogen doping. Chiral nanotubes having two haeckelite defects reveal a clear dependence on the nitrogen content with DOX-CNT interaction forces decreasing in the order 0N > 4N > 8N. These results contribute to a further understanding of drug-nanotube interactions and to the design of new drug delivery systems based on CNTs.  相似文献   
5.
The current work utilizes three separate techniques to study the physical aging process in amorphous poly(ethylene furanoate) (PEF), which is a recently introduced engineering thermoplastic with enhanced properties compared to petroleum‐sourced poly(ethylene terephthalate). Differential scanning calorimetry aging experiments were conducted at multiple aging temperatures and times, and the resultant enthalpic recovery values compared to the theoretical maximum enthalpy loss evaluated from calculations involving extrapolation of the equilibrium liquid line. Density measurements reveal densification of the matrix for the aged versus unaged samples, and provide an estimate for the reduction in free volume for the aged samples. Complementary oxygen permeation and pressure‐decay sorption experiments provide independent verification of the free volume reduction mechanism for physical aging in glassy polymers. The current work provides the first detailed aging study for PEF. © 2014 Wiley Periodicals, Inc. J. Polym. Sci., Part B: Polym. Phys. 2015 , 53, 389–399  相似文献   
6.
In this work, we suggest a novel quadratic programming‐based algorithm to generate an arbitrage‐free call option surface. The empirical performance of the proposed method is evaluated using S&P 500 Index call options. Our results indicate that the proposed method provides a more precise fit to observed option prices than other alternative methodologies. Copyright © 2014 John Wiley & Sons, Ltd.  相似文献   
7.
Results from 5D induced-matter and membrane theory with null paths are extended to show that a particle obeys the 4D Klein-Gordon equation but with a variable mass. The Dirac equation also follows, but raises concerns about 4D quantization in the two natural 5D gauges, and reopens the question of a Regge-like trajectory for the spin angular momenta and squared masses of gravitationally-dominated systems.  相似文献   
8.
In this paper we study constant mean curvature compact surfaces with two Jordan curves in parallel planes as boundary and we investigate the point at which the surface inherits the symmetries of its boundary.  相似文献   
9.
The NMR properties of nuclei linked to long linear polymer molecules are sensitive to the influence of hard walls. In this context, the residual energy of tensorial spin-spin interactions is calculated using a path integral approach. Several thermodynamic quantities of the polymer system (free energy, equation of state,...) are also expressed, taking chain stiffness effects and the presence of two repulsive walls into consideration.  相似文献   
10.
水斗非定常自由水膜流三维贴体数值模拟   总被引:9,自引:2,他引:7  
本研究采用水斗三维非正交贴体坐标系进行了非定常自由水膜流动的数值解析。对不规则水斗内表面采用三维非正交贴体坐标系下离散点进行拟合,推导了曲面离散点的法向矢量和曲面微元面高斯曲率、平均曲率等几何特征量的计算公式,进而导出流体粒子在运动方向上曲率计算式。在水斗三维贴体坐标系中,还推导了流体粒子在水斗曲面上的运动控制方程。最后对某水轮机水斗内表面非定常自由水膜流进行了数值模拟,得到其非定常水膜流态分布。  相似文献   
设为首页 | 免责声明 | 关于勤云 | 加入收藏

Copyright©北京勤云科技发展有限公司  京ICP备09084417号