全文获取类型
收费全文 | 47篇 |
免费 | 29篇 |
国内免费 | 7篇 |
专业分类
化学 | 16篇 |
晶体学 | 1篇 |
力学 | 2篇 |
综合类 | 5篇 |
数学 | 2篇 |
物理学 | 57篇 |
出版年
2024年 | 1篇 |
2022年 | 2篇 |
2021年 | 1篇 |
2020年 | 1篇 |
2019年 | 2篇 |
2018年 | 2篇 |
2017年 | 4篇 |
2016年 | 3篇 |
2014年 | 4篇 |
2013年 | 4篇 |
2012年 | 10篇 |
2011年 | 11篇 |
2010年 | 3篇 |
2009年 | 8篇 |
2008年 | 7篇 |
2007年 | 3篇 |
2006年 | 1篇 |
2005年 | 1篇 |
2004年 | 2篇 |
2003年 | 2篇 |
2002年 | 1篇 |
1999年 | 1篇 |
1998年 | 1篇 |
1997年 | 1篇 |
1994年 | 4篇 |
1991年 | 1篇 |
1990年 | 1篇 |
1989年 | 1篇 |
排序方式: 共有83条查询结果,搜索用时 15 毫秒
51.
52.
53.
54.
We investigate nonlinear interaction of nitrogen molecules with a two-color laser field composed by an intense800 nm laser pulse and a weak 400 nm laser pulse.It is demonstrated that the spectrum of 400 nm pulses is dramatically broadened when the two beams temporally overlap.In comparison,the spectral broadening in argon is less pronounced,although argon atoms and nitrogen molecules have comparable ionization potentials.We reveal that the dramatic spectral broadening originates from the greatly enhanced nonlinear optical effects in the near-resonant condition of interaction between the 400 nm pulses and the nitrogen molecular ions. 相似文献
55.
Transport properties of doped Bi_2Se_3 and Bi_2Te_3 topological insulators and heterostructures 下载免费PDF全文
In this review article, the recent experimental and theoretical research progress in Bi_2Se_3-and Bi_2Te_3-based topological insulators is presented, with a focus on the transport properties and modulation of the transport properties by doping with nonmagnetic and magnetic elements. The electrical transport properties are discussed for a few different types of topological insulator heterostructures, such as heterostructures formed by Bi_2Se_3-and Bi_2Te_3-based binary/ternary/quaternary compounds and superconductors, nonmagnetic and magnetic metals, or semiconductors. 相似文献
56.
带缓冲层的导模共振滤光片反射光谱特性 总被引:3,自引:2,他引:1
将均质多层膜系设计中的缓冲层概念引入到反射导模共振滤光片的设计中,以研究缓冲层的增加对导模共振滤光片反射光谱特性的影响.设计并通过严格的耦合波理论计算了一、二、三、四通道导模共振反射滤光片光谱特性.在膜系设计中增加缓冲层后.随着其厚度的逐渐增加.反射光谱中依次出现二、三、四个窄带反射峰;缓冲层厚度为796.35 nm时.当滤光片光栅层占空比在0.2~O.9范围内、光栅深度在100~200 nm变化时,共振峰的位置、反射率峰值高度几乎不变,保持了很好的多通道滤光片特性. 相似文献
57.
中心波长121.6nm的真空紫外窄带滤光片设计和制备 总被引:3,自引:1,他引:2
采用双半波法布里-珀罗(F-P)干涉滤光片结构设计了中心波长在121.6 am的窄带滤光片,其峰值透射率为6.78%,通带半宽度为10.7 nm.通过设计、制备和测量峰值波长在217 nm的滤光片验证了设计用到的光学常数和膜厚定标都比较精确.在此基础上制备了121.6 nm的窄带滤光片,到合肥同步辐射实验室测量的结果是中心波长在120.74 nm,峰值透射率为5.94%,通带半宽度为12 nm.可以看出实际制备的滤光片和预先设计的基本吻合但还是有一定的偏差,最后对实际测量的和理论设计的偏差进行了分析. 相似文献
58.
Normalized Mandel Parameter (Q) is introduced as a new measurement oi photon statistics. Dependences of Mandel parameter Q and corresponding normalized Mandel parameter (Q) on photon-counting time interval are experimentally investigated for pseudo-thermal light. We demonstrate that (Q) is more appropriate than Q, to measure the statistical deviation from Poisson distribution, because (Q) presents clearly both the intrinsic statistical properties and measuring effects. The advantages of (Q) in charactering nonclassical emissions are also discussed. 相似文献
59.
Preparation and Size Characterization of Silver Nanoparticles Produced by Femtosecond Laser Ablation in Water 下载免费PDF全文
Femtosecond laser ablation of silver plate placed in water is used to produce nanoparticle suspension. The method is easy to operate and the suspension is relatively stable. The optical properties and the size distribution of the suspension are studied with UV-vis absorption spectroscopy and dynamic light scattering, respectively. The shape of the nanoparticles is investigated by an atomic force microscope, which is near spherical. There are two kinds of nanoparticles, small particles with diameter about 35 nm, and large particles with diameter about 120 nm. 相似文献
60.
介绍了天体角度射电信标电磁波辐射特性和射电测量装置的组成,研究并选择了射电信标跟踪测量模式,进行了圆锥扫描天线系统设计,完成了接收机系统设计及灵敏度计算.在此基础上,进行了测天试验,实测结果表明:天体角度测量装置的最高测角精度达到了5.2",最差测角精度不超过29.7". 相似文献