全文获取类型
收费全文 | 214篇 |
免费 | 84篇 |
国内免费 | 26篇 |
专业分类
化学 | 27篇 |
晶体学 | 1篇 |
力学 | 107篇 |
综合类 | 2篇 |
数学 | 11篇 |
物理学 | 176篇 |
出版年
2024年 | 3篇 |
2023年 | 8篇 |
2022年 | 6篇 |
2021年 | 9篇 |
2020年 | 4篇 |
2019年 | 7篇 |
2018年 | 3篇 |
2017年 | 2篇 |
2016年 | 3篇 |
2015年 | 4篇 |
2014年 | 11篇 |
2013年 | 6篇 |
2012年 | 11篇 |
2011年 | 14篇 |
2010年 | 7篇 |
2009年 | 18篇 |
2008年 | 24篇 |
2007年 | 27篇 |
2006年 | 15篇 |
2005年 | 16篇 |
2004年 | 16篇 |
2003年 | 9篇 |
2002年 | 4篇 |
2001年 | 14篇 |
2000年 | 11篇 |
1999年 | 11篇 |
1998年 | 9篇 |
1997年 | 7篇 |
1996年 | 5篇 |
1995年 | 4篇 |
1994年 | 2篇 |
1993年 | 1篇 |
1992年 | 7篇 |
1991年 | 2篇 |
1990年 | 8篇 |
1989年 | 8篇 |
1988年 | 2篇 |
1987年 | 2篇 |
1985年 | 1篇 |
1984年 | 2篇 |
1982年 | 1篇 |
排序方式: 共有324条查询结果,搜索用时 125 毫秒
91.
1 同轴柱形电容器的优化,设计两个同轴柱形导体构成了同轴柱形电容器.设电容器的内、外导体壳半径分别为r和R,长度为L(L≥R—r),两导体壳层之间所填充电介质的介电常量为ε,其击穿场强为Emax(图1).在外半径R一定的情况下,如何选择内圆筒导体半径r,使得设计出的电容器可以承受的电压最大? 相似文献
92.
A scheme is presented for the cavities. In the scheme, each a coherent state with a small generation of entangled states for two atomic ensembles trapped in two distant atomic sample is initially in a Bloch state and the cavity mode is initially in amplitude. The dispersive dependent phase shift on the atomic system. The detection atomic samples collapse to an entangled Bloch state. atom-cavity interaction leads to a photon-number of a photon leaking from the cavities makes the two 相似文献
93.
94.
Enhanced Field Emission of Composite Au Nanostructured Network on Si Nanoporous Pillar Array 总被引:1,自引:0,他引:1 下载免费PDF全文
Nanocrystallites Au particles are deposited on a well-aligned silicon nanoporous pillar array (Si-NPA) surface through immersion plating to form an Au/Si-NPA composite system. It is found that a large number of Au nanoparticles are accumulated on the bottom of Si pillars to form a regular network structure. By studying the field emission properties of such an Au/Si-NPA composite system, we find that the Au/Si-NPA exhibits good field emission properties, with staring field about 2 V/μm and emission current density 67μA/cm^2 at 7.59 V/μm. The enhanced field emission can be deduced from the unique morphology and structure of Au/Si-NPA. 相似文献
95.
An experimentally realizable physical scheme for preparing multiqubit cluster states from a large detuned atomcavity interaction is proposed. The scheme is free of any type of measurement and insensitive to the cavity decay, and the cavity field is only virtually excited so that there is no information exchanging between atom and cavity. The time required for the gate operations is very short, which is important for decoherence. We also discuss the experimental feasibility of our scheme. 相似文献
96.
Energy—Momentum Pseudo—tensor of Cylindrical Gravitational Waves of Both the Polarized States 总被引:1,自引:0,他引:1 下载免费PDF全文
According to the Einstein-Tolman expression of the energy-momentum pseudo-tensor(EMPT),we calculate the EMPT of cylindrical gravitational waves (CGW) of both the polarized states (BPS) in cylindrical polar coordinates and Cartesian coordinates.We find that Cartesian coordinates are the more suitable coordinates to describe the CGW of BPS. 相似文献
97.
《中国光学快报(英文版)》2008,(10):743-747
Single-mode, long-wavelength vertical-cavity surface-emitting lasers (VCSELs) in the near- to mid-infrared covering the wavelength range from 1.3 to 2.3 μm are presented. This wide spectral emission range opens applications in gas sensing and optical interconnects. All these lasers are monolithically grown in the InGaAlAs-InP material system utilizing a buried tunnel junction (BTJ) as current aperture. Fabricated with a novel high-speed design with reduced parasitics, bandwidths in excess of 10 GHz at 1.3 and 1.55 μm have been achieved. Therefore, the coarse wavelength division multiplexing (CWDM) wavelength range of 1.3 to 1.6 μm at 10 Gb/s can be accomplished with one technology. Error-free data-transmission at 10 Gb/s over a fiber link of 20 km is demonstrated. One-dimensional arrays have been fabricated with emission wavelengths addressable by current tuning. Micro-electro-mechanical system (MEMS) tunable devices provide an extended tuning range in excess of 50 nm with high spectral purity. All these devices feature continuous-wave (CW) operation with typical single-mode output powers exceeding 1 mW. The operation voltage is around 1 - 1.5 V and power consumption is as low as 10 - 20 mW. Furthermore, we have also developed VCSELs based on GaSb, targeting functionality of tunable diode laser spectroscopy (TDLS) applying a 1.84-μm VCSEL. at the wavelength range from 2.3 to 3.0 μm. The systems is shown by presenting a laser hygrometer 相似文献
98.
99.
100.