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   10篇
  免费   3篇
  国内免费   1篇
化学   1篇
物理学   13篇
  2017年   1篇
  2014年   1篇
  2013年   1篇
  2012年   2篇
  2011年   2篇
  2010年   2篇
  2009年   3篇
  2007年   1篇
  2006年   1篇
排序方式: 共有14条查询结果,搜索用时 15 毫秒
1.
LED封装材料在封装的过程中由于热膨胀的缘故会产生应力,将对LED的发光效率产生较大影响。改装的迈克尔逊干涉仪用于测量二氧化钛/有机硅复合的LED封装材料在不同温度范围内的热膨胀系数,具有测量准确,分辨率高等优点。  相似文献   
2.
3.
用Excel研究单摆测重力加速度实验中的随机误差分布规律   总被引:1,自引:0,他引:1  
在单摆法测重力加速度实验中,为了能够快速且正确地得到摆球运动周期的随机误差分布规律,本文提出了一种应用Excel软件给出随机误差统计直方图的方法。该方法简单直观,能够加深同学对随机误差统计规律的认识。  相似文献   
4.
The correct calibration of coefficients in the inversion model for aerosol mass concentration is the precondition of obtaining highly precise results. The concept of the fractal dimension of scattering equivalent section is presented, and the calibration mechanism of the fractal dimension is discussed. Based on the calibration mechanism, the stability of the fractal dimension is analyzed. Theoretical analysis and experimental results indicate that the fractal dimension obtained by the intersection point calibration method is stable, while that calibrated by the Gauss-Newton method is instable, which only describes the shape characteristic of a small sample. The study of the calibration mechanism for the fractal dimension markedly enhances the present model for aerosol mass concentration.  相似文献   
5.
顾斌  李传起  陈玉林 《中国物理 B》2009,18(6):2137-2142
We present a scheme for multiparty quantum remote secret conference (MQRSC) with pure entangled states, not maximally entangled multipartite quantum systems. The conferees first share a private quantum key,a sequence of pure entangled states and then use them to encode and decode the secret messages. The conferees exploit the decoy-photon technique to ensure the security of the transmission of qubits. This MQRSC scheme is more feasible and effcient than others.  相似文献   
6.
在共沉淀法的基础上,通过双施主不同浓度的Nd3+和Sm3+,Er3+(4.0%~5.0%)掺杂,研究了BaTiO3基表面型陶瓷电容器的电性能,结果表明,Sm3+和Er3+的掺杂可以提高居里温度,但使介电常数降低,其含量为25%时可获得绝缘电阻500 MΩ左右,C/S为0.5895μf·cm-2电性能参数.  相似文献   
7.
介绍了超声波时差法风速测量的基本原理,以及基于MSP430微控制器和MAG3110的风速风向测量系统的实现方法。给出了以MSP430芯片为核心的硬件设计的总体框架图。详细地阐述了各个外围接口电路的设计,以及超声波风速风向测量的软件设计。系统具有结构简单、精度高、功耗低和扩展方便等特点,能够满足大学物理实验教学的风况信息测量。  相似文献   
8.
马龙  陈玉林 《物理实验》2011,31(3):41-46
介绍了利用超声波对多个物体进行定位的装置及方法,利用2个超声波收发传感器接收每个物体的反射波,并通过一定的算法计算出每个物体的位置.该装置可对二维空间内多个物体进行定位,并可对其测速、跟踪,甚至测出物体轮廓.  相似文献   
9.
The protocol using spatial entanglement to purify polarization entanglement by entanglement transformation between different degrees of freedom in a realistic environment is elaborated. Our analyses show that the bit-flip error can be completely purified, but the pure maximally entangled state can not be obtained ultimately if the spatial entanglement is impure. The fidelity of the purified state is decided by the spatial entanglement. Furthermore, this protocol can also be extended to purify the multi-particle Greenberg—Horne—Zeilinger (GHZ) state. It is presented that the spatial entanglement can be served as another source to improve the quality of entanglement.  相似文献   
10.
顾斌  李传起  徐飞  陈玉林 《中国物理 B》2009,18(11):4690-4694
This paper presents a scheme for high-capacity three-party quantum secret sharing with quantum superdense coding,following some ideas in the work by Liu et al (2002 Phys.Rev.A 65 022304) and the quantum secret sharing scheme by Deng et al (2008 Phys.Lett.A 372 1957).Instead of using two sets of nonorthogonal states,the boss Alice needs only to prepare a sequence of Einstein–Podolsky–Rosen pairs in d-dimension.The two agents Bob and Charlie encode their information with dense coding unitary operations,and security is checked by inserting decoy photons.The scheme has a high capacity and intrinsic efficiency as each pair can carry 2lbd bits of information,and almost all the pairs can be used for carrying useful information.  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