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   175435篇
  免费   17876篇
  国内免费   10345篇
化学   91626篇
晶体学   1924篇
力学   12923篇
综合类   533篇
数学   42757篇
物理学   53893篇
  2024年   232篇
  2023年   2065篇
  2022年   2545篇
  2021年   3561篇
  2020年   4192篇
  2019年   4051篇
  2018年   12919篇
  2017年   12517篇
  2016年   10577篇
  2015年   5482篇
  2014年   6050篇
  2013年   7824篇
  2012年   12749篇
  2011年   19589篇
  2010年   11677篇
  2009年   11788篇
  2008年   12762篇
  2007年   14287篇
  2006年   5666篇
  2005年   5840篇
  2004年   4841篇
  2003年   4530篇
  2002年   3371篇
  2001年   2211篇
  2000年   2044篇
  1999年   2219篇
  1998年   2032篇
  1997年   1856篇
  1996年   2080篇
  1995年   1614篇
  1994年   1531篇
  1993年   1257篇
  1992年   1121篇
  1991年   1045篇
  1990年   840篇
  1989年   621篇
  1988年   522篇
  1987年   439篇
  1986年   431篇
  1985年   364篇
  1984年   283篇
  1983年   190篇
  1982年   183篇
  1981年   144篇
  1980年   122篇
  1979年   87篇
  1978年   68篇
  1976年   52篇
  1974年   56篇
  1973年   56篇
排序方式: 共有10000条查询结果,搜索用时 15 毫秒
991.
By using probabilistic approaches, Liouville theorems are proved for a class of Riemannian manifolds with Ricci curvatures bounded below by a negative function. Indeed, for these manifolds we prove that all harmonic functions (maps) with certain growth are constant. In particular, the well-known Liouville theorem due to Cheng for sublinear harmonic functions (maps) is generalized. Moreover, our results imply the Brownian coupling property for a class of negatively curved Riemannian manifolds. This leads to a negative answer to a question of Kendall concerning the Brownian coupling property.  相似文献   
992.
多层光子晶体滤波器研究   总被引:34,自引:6,他引:28  
从双层结构出发研究了一种由多块不同的单周期光子晶体组合而成的多层结构的滤波器,论述了这种滤波器的工作原理,研究表明这种结构适于制作带通、窄带通过、带阻、宽带带阻、高通以及其它各种性能的滤波器。实验和理论研究的结果相一致。  相似文献   
993.
This paper presents the simulation of surface acoustic wave (SAW)-induced absorption coefficient and refractive index change in InGaAs-GaAs multiple quantum well (MQW) structures operating near 980 nm. The exciton problem is solved in two dimensional momentum space to include the non-axial effect due to strain induced valance band mixing and nonparabolicity. The optical absorption coefficient and refractive index changes near the band gap in the MQWs are calculated as a function of SAW power.  相似文献   
994.
偏硅酸钙中Pr3+的4f5d态的光谱特性及Pr3+→Gd3+的能量传递   总被引:2,自引:0,他引:2  
合成了高效发射UV光的CaSiO3:Pr^3 新型荧光体,研究了室温下Pr^3 的4f5d态的发射和激发光谱,Pr^3 的4f5d态的最低子能级向4f^2组态的^3H4,^3H6和^1G4能级跃迁产生UV发射,并不伴随有4f-4f能级跃迁的可见光发射。Pr^3 的浓度猝灭是由于辐射和无辐射能量传递造成的,同时,在CaSiO3中,存在Pr^3 →Cd^3 的能量传递,探讨了其能量传递特性。  相似文献   
995.
An intensive care nursery provides health care for critically ill newborn infants. During a typical shift, infants range from those needing only occasional care to those requiring constant attention. At the beginning of each shift, the head nurse groups the patients for assignment to staff nurses. Typically each nurse cares for one group of infants throughout the shift. The large variation in infant conditions along with several complicating side constraints makes it difficult to develop balanced nurse work loads. We develop a mathematical programming approach for achieving better workload balance. We first develop a detailed neonatal acuity system that quantifies the nursing workload of each patient. We then develop an integer linear program that assigns patients to nurses while balancing nurse workloads. Because this model is computationally intractable, we develop a heuristic that exploits the fact that most nurseries are divided into a number of physical zones. We use ten case studies taken from a major university hospital to benchmark the performance of this heuristic. We also perform a designed experiment using randomly generated problems that examines the effect of nursery parameters on heuristic performance.  相似文献   
996.
We study the problem of configuring a fleet, in which vehicles receive information on-line about the demand that they should fulfil while they are on the road. In each district it must be decided the number of vehicles and their capacity. The objective function is to minimise the operational cost subject to constraints for the minimum delivery capacity, the maximum vehicle size and the average waiting time for customers. The last constraint is modelled as a queuing system that is adjusted according to the simulation of the delivery process of a Chilean company that distributes liquefied petroleum gas in portable cylinders. We provide the analytical form of all the components of the model, so it can be solved using a standard non-linear programming package. We show that the fleet may increase its sales by 3% and reduce the waiting time of customers 10% by allowing a set of vehicles to share the buffer of orders rather than having vehicles to exclusively serve smaller sectors.  相似文献   
997.
采用从头算CCSD(T)/6-311 G(2d,2p)//B3LYP/6-311G(d,p)方法,研究了自由基-分子反应F CH2CHCH3的各种不同的反应通道.该反应主要是通过复合物形成机制进行,即F分别加到碳碳双键的两端形成自由基复合物1和2.这两种亚稳态自由基会解离成三种产物:H C3H5F、CH3 C2H3F和HF C3H5.理论计算结果表明,生成CH3 C2H3F是反应的主要通道,而生成H C3H5F和HF C3H5对产物也有一定的贡献.这一结果和实验符合得很好.  相似文献   
998.
高性能ZnO纳米块体材料的制备及其拉曼光谱学特征   总被引:6,自引:0,他引:6       下载免费PDF全文
利用六面顶高压设备制备了高密度、低脆性、纳米级的ZnO块体材料,用MDI/JADE5 X射线衍射仪(Cu靶)和XL30S-FEG场发射扫描电子显微镜对高压样品的相组成、晶粒尺寸及微观形貌进行了表征.利用E55+FRA106/5傅里叶变换激光拉曼光谱仪通过ZnO块体样品位于50—500cm-1之内的拉曼光谱, 研究了极性半导体纳米材料的拉曼光谱学特征.发现在极性半导体ZnO纳米块体材料中,没有出现明显的尺寸限制效应. 关键词: ZnO纳米块体 拉曼光谱 尺寸限制效应  相似文献   
999.
采用低压金属有机化合物气相沉积法(LP-MOCVD)生长并制作了1.6—1.7μm大应变InGaAs/InGaAsP分布反馈激光器.采用应变缓冲层技术,得到质量良好的大应变InGaAs/InP体材料.器件采用了4个大应变的量子阱,加入了载流子阻挡层改善器件的温度特性.1.66μm和1.74μm未镀膜的3μm脊型波导器件阈值电流低(小于15mA),输出功率高(100mA时大于14mW).从10—40℃,1.74μm激光器的特征温度T0=57K,和1.55μm InGaAsP分布反馈激光器的特征温度相当. 关键词: MOCVD InGaAs/InGaAsP 应变量子阱 分布反馈激光器  相似文献   
1000.
The problem of scheduling on a multi-stage parallel-processor architecture in computer centres is addressed with the objective of minimizing average completion time of a set of requests. The problem is modelled as a flexible flowshop problem for which few heuristics exist in the flowshop scheduling literature. A new three-phase heuristic is proposed in this paper. An extensive computational experiment has been conducted to compare the performance of the existing heuristics and the proposed heuristic. The results indicate that the proposed heuristic significantly outperforms the existing ones. More specifically, the overall average error of the best existing heuristic is about five times that of the proposed heuristic while the overall average CPU time of the proposed heuristic is about half of the best existing one. More importantly, as the number of requests increases, the CPU time of the proposed heuristic decreases considerably (compared to the best existing heuristic) while the ratio of the error (of the best existing to the proposed heuristic) of about five times remains almost the same.  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