全文获取类型
收费全文 | 2125篇 |
免费 | 262篇 |
国内免费 | 116篇 |
专业分类
化学 | 312篇 |
晶体学 | 6篇 |
力学 | 665篇 |
综合类 | 8篇 |
数学 | 113篇 |
物理学 | 740篇 |
综合类 | 659篇 |
出版年
2024年 | 5篇 |
2023年 | 22篇 |
2022年 | 43篇 |
2021年 | 48篇 |
2020年 | 65篇 |
2019年 | 56篇 |
2018年 | 67篇 |
2017年 | 67篇 |
2016年 | 72篇 |
2015年 | 66篇 |
2014年 | 100篇 |
2013年 | 146篇 |
2012年 | 128篇 |
2011年 | 147篇 |
2010年 | 94篇 |
2009年 | 115篇 |
2008年 | 106篇 |
2007年 | 111篇 |
2006年 | 114篇 |
2005年 | 99篇 |
2004年 | 89篇 |
2003年 | 90篇 |
2002年 | 105篇 |
2001年 | 70篇 |
2000年 | 59篇 |
1999年 | 51篇 |
1998年 | 48篇 |
1997年 | 44篇 |
1996年 | 27篇 |
1995年 | 37篇 |
1994年 | 43篇 |
1993年 | 30篇 |
1992年 | 29篇 |
1991年 | 20篇 |
1990年 | 28篇 |
1989年 | 16篇 |
1988年 | 16篇 |
1987年 | 10篇 |
1986年 | 2篇 |
1985年 | 6篇 |
1984年 | 4篇 |
1982年 | 3篇 |
1981年 | 1篇 |
1980年 | 3篇 |
1957年 | 1篇 |
排序方式: 共有2503条查询结果,搜索用时 15 毫秒
1.
L油田B区块开展"二三结合"实验区,"二三结合"开发模式渗流特征对区块的合理高效开发具有重要意义。为了明确其渗流特征,利用油藏数值模拟软件Eclipse建立代表意义的油藏数值模型,研究区块"二三结合"开发模式下原射孔层和补孔层的渗流特征,分析了"二三结合"开发模式下,不同开发阶段综合含水率、采出程度、井底压力、地层压力及含水饱和度的变化特征。研究表明,"二三结合"开发模式先通过水驱开发挖潜原射孔层剩余油,提高厚油层顶部剩余油的采出程度,再通过聚合物驱进一步提高开发效果,通过水驱与聚驱的综合作用,最终得到较好的开发效果。 相似文献
2.
赵志伟 《光谱学与光谱分析》2002,22(6):895-897
在化学发光分析中,常常要用到碱性条件下鲁米诺与过氧化氢的反应系统,通过催化剂辣根过氧化物酶使反应顺利进行。如果再加入适当的增强剂,则灵敏度提高且发光时间延长,可改善测定的重现性。实验证明,对位酚类衍生物,如:对叔丁基苯酚,对甲苯酚的发光增强作用明显,其发光效率可上升几十倍,发光时间也获得有效延长。 相似文献
3.
水轮机水力稳定性的分析 总被引:2,自引:0,他引:2
根据收集国内外水轮机水力稳定性资料 ,分析了引起水轮机水力不稳定性的因素 ,并结合实例分析可能引起的危害 ,最后提出了解决问题的方法和建议 相似文献
4.
轴流风扇叶片端导叶作用的研究 总被引:2,自引:0,他引:2
本文采用数值方法研究了叶片端导叶对轴流风扇性能的影响。通过与普通开式轴流风扇比较,分析了叶片端导叶对内部流动作用的机理.数值计算结果表明:叶片端导叶的安装位置将影响轴流风扇气动效率,安装叶片端导叶不能提高风扇静压升,但是在压力面安装时能有效地减小风扇叶顶泄漏流与主流的掺混损失;在设计流量下,压力面安装叶片端导叶使泄漏涡的作用范围较小,涡核更靠近吸力面;吸力面安装叶片端导叶弱化了泄漏涡的强度但没有减小泄漏涡的作用范围。 相似文献
5.
V. V. Kozlov 《Functional Analysis and Its Applications》2005,39(4):271-283
We discuss the symplectic geometry of linear Hamiltonian systems with nondegenerate Hamiltonians. These systems can be reduced to linear second-order differential equations characteristic of linear oscillation theory. This reduction is related to the problem on the signatures of restrictions of quadratic forms to Lagrangian planes. We study vortex symplectic planes invariant with respect to linear Hamiltonian systems. These planes are determined by the solutions of quadratic matrix equations of a special form. New conditions for gyroscopic stabilization are found. 相似文献
6.
7.
Yan Youping 《东华大学学报(英文版)》1995,(2)
A special tip of vortex twisting nozzle is designed and fastened at the exit out of the drafted reed space or shed. Compressed air is supplied by the tube near the last subnozzle, weft yarn is retwisted and twistloss can be totally compensated with slight excess of 0.74%. 相似文献
8.
We consider the isothermal flow through a cylindrical flat chamber, a model of some particular heat exchanger, for which LDV measurements and a numerical simulation have been performed. Experimental results show the establishment of an important vortex zone, the secondary flow extending all along the chamber radius. This observation leads to an expected significant increase of the fluid mixing. Results issued from the numerical simulation appear to be in close agreement with experimental data. Nevertheless, the k–ε model used here must be improved to obtain a better approach near the vortex centre. To cite this article: S. Petitot et al., C. R. Mecanique 330 (2002) 593–599. 相似文献
9.
S. S. Banerjee S. Goldberg Y. Myasoedov M. Rappaport E. Zeldov A. Soibel F. de la Cruz J. van der Beek M. Konczykowski T. Tamegai V. Vinokur 《Pramana》2006,66(1):43-54
Disorder and porosity are parameters that strongly influence the physical behavior of materials, including their mechanical,
electrical, magnetic and optical properties. Vortices in superconductors can provide important insight into the effects of
disorder because their size is comparable to characteristic sizes of nanofabricated structures. Here we present experimental
evidence for a novel form of vortex matter that consists of inter-connected nanodroplets of vortex liquid caged in the pores
of a solid vortex structure, like a liquid permeated into a nanoporous solid skeleton. Our nanoporous skeleton is formed by
vortices pinned by correlated disorder created by high-energy heavy ion irradiation. By sweeping the applied magnetic field,
the number of vortices in the nanodroplets is varied continuously from a few to several hundred. Upon cooling, the caged nanodroplets
freeze into ordered nanocrystals through either a first-order or a continuous transition, whereas at high temperatures a uniform
liquid phase is formed upon delocalization-induced melting of the solid skeleton. This new vortex nanoliquid displays unique
properties and symmetries that are distinct from both solid and liquid phases. 相似文献
10.
An algorithm for a time accurate incompressible Navier–Stokes solver on an unstructured grid is presented. The algorithm uses a second order, three‐point, backward difference formula for the physical time marching. For each time step, a divergence free flow field is obtained based on an artificial compressibility method. An implicit method with a local time step is used to accelerate the convergence for the pseudotime iteration. To validate the code, an unsteady laminar flow over a circular cylinder at a Reynolds number of 200 is calculated. The results are compared with available experimental and numerical data and good agreements are achieved. Using the developed unsteady code, an interaction of a Karman vortex street with an elliptical leading edge is simulated. The incident Karman vortex street is generated by a circular cylinder located upstream. A clustering to the path of the vortices is achieved easily due to flexibility of an unstructured grid. Details of the interaction mechanism are analysed by investigating evolutions of vortices. Characteristics of the interactions are compared for large‐ and small‐scale vortex streets. Different patterns of the interaction are observed for those two vortex streets and the observation is in agreement with experiment. Copyright © 2004 John Wiley & Sons, Ltd. 相似文献