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2003-2017 物理学
为您找到包含“”的内容共2851

周秀珍,彭天云

2011-12-20

本文揭示波动本身的相位不变,但波动的检测器相对于波源运动,导致观察者检测到的波动相位发生变化。波动的多普勒效应的是由于观察点所在空间波动的场量的位相变化率(时间变化率)所产生的,实质是由于观察点与波源(或次波源)相对运动,从而导致测量空间场量的位相时间变化率产生变化而引起的。

武夷学院物理系,福建 武夷山 354300,武夷学院物理系

#物理学#

0评论(0 分享(0)

Li Anyong

We assume that quantum mechanics is a general theory to describe any physical system, so the basic mathematical structure for physics is the Hilbert space not the spacetime. A quantum theory of the spacetime was proposed that the physical spacetime is not a prioir objective existence exterior to the matter and not a prior background as the stage of the matter, but an existence form and nature of the matter, an algebraic structure on the Hilbert space. The spacetime of a free particle, having been constructed based on the Hilbert space of the particle, is a four dimensional Lie groups composed of all the unitary transformations produced by the energy and momentum operators of the particle and has a metric with Lorentzian signature.

2011-11-30

School of Chemistry and Chemical Engineering, Southwest University, ChongQing 400715

#Physics#

0评论(0 分享(0)

An Yong Li

Since some experiments have found superluminality, we assume that the particles in the universe are divided into three classes: the subluminal, luminal and superluminal particles by the speed of light, their energy-momenum relations are E2 = m2c4 + c2p2, E2 = c2p2, and E2 + m2c4 = c2p2, respectively. The Einstein's theory of relativity still holds and is consummated by the existence of superluminal particles, and the Lorentz symmetry of the spacetime is also not violated. There should have two sets of inertial reference systems: subluminal and superluminal reference systems. Two inertial reference systems in each set are linked by Lorentz transformations, but superluminal coordinate transformations between the two sets do not exist in the 1+3 dimensional spacetime. So the physical laws have different expressions in the two sets of inertial reference systems, the principle of special relativity should be revised.

2011-12-02

School of Chemistry and Chemical Engineering, Southwest University, 400715, Chongqing, P. R. Chnia

#Physics#

1评论(0 分享(0)

徐山森,赵昆,田璐,尼浩,苗青

2011-12-02

本文利用太赫兹时域光谱技术,对不同种类的日用精细化工产品进行了光谱检测,获得了在0.2-2.0 THz频段下的太赫兹光谱,旨在分析THz-TDS技术对日用精细化工产品进行鉴定识别的可行性。研究发现,在各样品所对应的THz频段内,四种产品对THz脉冲的吸收系数与折射率曲线有明显的分层现象,且其他类产品的细微差别亦可利用THz折射率谱进行有效区分。说明THz-TDS在日用精细化工产品的区分与鉴定领域有广泛的应用前景。此外,日用精细化工产品属于石油产业产物之一,说明THz技术在油气光学领域中的应用也有研究的价值。

中国石油大学(北京),理学院,北京,102249,中国石油大学(北京),理学院,北京,102249,中国石油大学(北京),理学院,北京,102249,中国石油大学(北京),理学院,北京,102249,中国石油大学(北京),理学院,北京,102249

#物理学#

0评论(0 分享(0)

Luo Xiyuan,Tan Guotai,Wang Huanhua,Yuan Mengyao

Zinc nanoplates of two kinds of basal surfaces were grown using a non-catalytic and template-free thermal evaporation. High resolution tunneling electron microscopy and selected area electron diffraction analyses reveal that the nanoplates are connected single crystals with {0001} and {11-20} as their basal planes. The intrinsic growth anisotropy of zinc was verified as the driving force leading to the formation of the nanoplates to minimize the total surface energy. The growth of zinc nanoplates follows the mechanism similar to vapor-solid mechanism.

2011-12-06

National Science Foundation of China (Grant No. 1097905

Grant No. 10875144) and the Specialized Research Fund for the Doctoral Program of Higher Education of China (Grant No. 200800271045)

College of Nuclear Science and Technology, Beijing Normal University, 100875, China,College of Nuclear Science and Technology, Beijing Normal University, 100875, China,Institute of High Energy Physics, Chinese Academy of Sciences, Beijing 100049, China,Institute of High Energy Physics, Chinese Academy of Sciences, Beijing 100049, China

#Physics#

0评论(0 分享(0)

杨晨,赵昆,田璐,尼浩,苗青

2011-12-06

实验利用太赫兹时域光谱(THz-TDS)技术对调味料样品进行检测。经过快速傅里叶变换(FFT),得出淀粉、白糖、红糖、苏打、食盐和味精样品在太赫兹波段的光谱数据。样品的吸收谱在0.2-2.0THz频段内各不相同并且呈现出特征吸收峰。样品的平均折射率在1.83-2.98之间,并且折射率谱在其吸收峰所对应的频率处出现了反常色散。对吸收系数的峰值位置以及折射率进行定标分析,THz-TDS技术可以用于不同种调味料的定性检测。实验数据为调味料的鉴别提供了依据,可以用于建立调味料的太赫兹波谱数据库。

中国石油大学(北京)理学院,北京 102249,中国石油大学(北京)理学院,北京 102249,中国石油大学(北京)理学院,北京 102249,中国石油大学(北京)理学院,北京 102249,中国石油大学(北京)理学院,北京 102249

#物理学#

本文收录在中国科技论文在线精品论文,2012,5(3):208-211.

0评论(0 分享(0)

XING Lili,HE Bin,CHEN Zhaohui,XUE Xinyu

Uniformly loaded Pd-SnO2 nanorods are synthesized via a simple one-step hydrothermal route. The gas sensors fabricated from Pd-SnO2 nanorods exhibit high sensitivity and fast response. The sensitivity at 300 ℃ is up to 9.9, 36.8, 55.6, 89.1 and 168.2 upon exposure to 100, 200, 300, 500 and 1000 ppm ethanol, respectively. And the work temperature can be lowered down to 200 ℃. Such behaviors can be attributed to Schottky barrier at Pd/SnO2 interface and catalytic effect of Pd nanoparticles. Our results open a way for uniform modification of SnO2 nanorods with Pd nanoparticles and enhancing their gas sensing performance.

2011-12-08

the Fundamental Research Funds for the Central Universities (No. N09040517 and No. N100405109

Specialized Research Fund for the Doctoral Program of Higher Education of China (No. 20090042120025

the National Natural Science Foundation of China (No.51102041 and No.11104025

Liaoning Natural Science Foundation (No. 20091027

College of Sciences, Northeastern University, Shenyang 110004, China,College of Sciences, Northeastern University, Shenyang 110004, China,College of Sciences, Northeastern University, Shenyang 110004, China,College of Sciences, Northeastern University, Shenyang 110004, China

#Physics#

0评论(0 分享(0)

钟火平,李公平

2011-12-16

居里温度高于室温的稀磁半导体材料有望用于自旋电子学器件的开发,因此引起各国研究人员的关注。在室温下,能量为80keV,注量为1×10E17 ions.cm-2的钴离子分别注入到两片长、宽均为10x10mm,厚度为0.5mm的单晶二氧化钛样品,在氮气保护下,样品在温度为900oC的条件下退火30分钟。利用新加坡国立大学物理学部超导量子干涉仪测量样品铁磁性,另外应用X射线衍射(XRD)和扩展边X射线吸收精细结构谱(EXAFS)研究钴离子注入后样品的微观结构。在本研究中,钴离子注入后但未退火的样品在室温下其饱和磁化强度约为0.6×10E-4emu,退火后样品的饱和磁化强度约为0.6×10E-5emu。XRD 和EXAFS研究表明Co在退火后的样品中主要以氧合态形式存在,Co在退火前的样品中主要以团簇形式存在。本文将阐述样品微观结构与铁磁性来源之间的关系。

兰州大学核科学与技术学院,兰州市 730000,兰州大学核科学与技术学院

#物理学#

0评论(0 分享(0)

Shi Gangde,Tan Huatang,Li Gaoxiang

In this paper, we investigate the generation of continuous-variable quadripartite square cluster state of optical fields and discuss the enhancement of the multipartite entanglement of the cluster state via quantum feedback. We show that the quadripartite square cluster state can be generated via concurrent OPO processes and the loss of the cavity will degrade the quantum correlations of the cluster state. By introducing appropriate feedback loops, we find that the entanglement and the purity of the cluster state can be improved significantly.

2011-12-09

Project supported by National Natural Science Foundation of China (Grant No. 11074087

the Ministry of Education under project SRFDP(Grant Nos. 200805110002

Department of physics, Huazhong Normal University, WuHan 430079,Department of physics, Huazhong Normal University, Wuhan 430079,Department of physics, Huazhong Normal University, Wuhan 430079

#Physics#

0评论(0 分享(0)

王念川,肖井华

2011-12-16

Kuramoto 模型自从20世纪中页提出以后,由于其包含简单而丰富的动力学现象,人们对该模型的研究从未间断。本论文主要研究在最近邻带周期性边界条件的Kuromoto模型下的同步问题。研究发现,由于振子初始相位的随机性,导致结果中振子频率的多态现象。又利用序参量时序图,来验证结果的正确性。通过剥离态算法,本文得到分叉图中"迟滞现象"。

北京邮电大学理学院,北京 100876,北京邮电大学

#物理学#

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