摘要：
The hadronization effects induced by different colour connections of c (c) over barq (q) over bar system in e(+)e(-) annihilation are investigated by a toy model where diquark fragmentation is employed based on Pythia. It is found that the correlations between the charm baryons and charm antibaryons produced via diquark pair fragmentation are much stronger, and their momentum spectra are harder than those from the standard colour connection in Pythia. (c) 2006 Elsevier B.V. All rights reserved.
摘要：
We report on an entropy analysis using Ma's coincidence method on pi(+)p and K(+)p collisions at root s = 22 GeV. A scaling law and additivity properties of Renyi entropies and their charged-particle multiplicity dependence are investigated. The results are compared with those from the PYTHIA Monte Carlo model.
摘要：
<正> 牛顿第二定律的验证是大学物理实验中的一个基础性实验.它是一个验证性实验,涉及到检验一个物理定律或规律的基本途径和方法.因此对于其实验精度往往有特殊的要求.本文先简要地分析一下现行高校中牛顿第二定律验证实验的方法,然后对其做了一些改进,改进后的实验精简了实验器材,提高了实验精度.1 原实验方法的分析目前许多高校在安排牛顿第二定律验证实验时都采用整体法.如图1所示,水平气垫导轨上一质量为 M 的滑块,用一质量可以不计的细线通过轻滑轮与质量为 m 的砝码相连,根据牛顿第二定律有
摘要：
Assuming that the single-event transverse momentum distribution fluctuates event by event according to a distribution functional, we derive analytical expressions for both the variance of event-wise mean transverse momentum and the two-particle transverse momentum correlation. The relation between these two is discussed. An evaluation of statistical fluctuation is given. An exponential form for the single-event transverse momentum distribution is taken as an example to demonstrate our method for extracting event-by-event dynamical fluctuation of single-event transverse momentum distribution from experimental data.
作者机构：
[Cai, X] Cent China Normal Univ, Coll Phys Sci & Technol, Wuhan 430079, Hubei, Peoples R China.;China W Normal Univ, Inst Theoret Phys, Nanchong 637002, Sichuan, Peoples R China.;Cent China Normal Univ, Inst Particle Phys, Wuhan 430079, Hubei, Peoples R China.
通讯机构：
[Cai, X] C;Cent China Normal Univ, Coll Phys Sci & Technol, Wuhan 430079, Hubei, Peoples R China.
摘要：
Recent work, which treats the Hawking radiation as a semiclassical tunneling process at the horizon of the Schwarzschild and Reissner-Nordström spacetimes, indicates that the exact radiant spectrum is no longer pure thermal after considering the black hole background as dynamical and the conservation of energy. In this paper, we extend the method to investigate Hawking radiation as massless particles tunneling across the event horizon of the Kerr black hole and that of charged particles from the Kerr-Newman black hole by taking into account the energy conservation, the angular momentum conservation, and the electric charge conservation. Our results show that when self-gravitation is considered, the tunneling rate is related to the change of Bekenstein-Hawking entropy and the derived emission spectrum deviates from the pure thermal spectrum, but is consistent with an underlying unitary theory.
期刊：
Proceedings of the 2006 International Conference on Image Processing, Computer Vision, and Pattern Recognition, IPCV'06,2006年2:547-550
通讯作者：
Liu, S.
作者机构：
[Liu, Shijin; Yuan, Jing] Electronic Department, College of Physics, Huazhong Normal University, Wuhan, Hubei, 430079, China
摘要：
Threshold segmentation and Complementary Similarity Measure plays an important role in the Optical Character Reader (OCR). Generally, threshold segmentation and matching are separated. One of some methods such as iterative method, ENT, OSTU and so on is applied to threshold segmentation. But in practice, these methods are adaptive to a restricted condition. When character is distorted by random noise, these methods of threshold segmentation are not available. In this paper, we will propose a new algorithmic of integrating Dynamic Threshold segmentation and Complementary Similarity Measure to robust above defection. And this algorithmic can use similarity relationship to make the measure robust against noise and improve rate of character recognition greatly.
作者机构：
Institute of Nano-science and Technology,Central China Normal University,Wuhan 430079,China
摘要：
Uniform crystalline CdSnO_3 centre dot H_2O nanocubes with a 28-35 nm edge length have been obtained via the ion-exchange reaction of Na_2Sn(OH)_6 in a CdSO_4 aqueous solution,assisted by ultrasonic treatment.Precursor Na_2-Sn(OH)_6 crystals were prepared via hydrothermal treatment in an ethanol/water solution.The formation of CdSnO_3 centre dot 3H_2O nanocubes resulted from the strain during the ion-exchange process.The influences of reaction conditions,such as ion-exchange (ultrasonic treatment) duration,solvent constitutes,surfactant,and pH on the formation of CdSnO_3 centre dot 3H_2O crystals were described.Crystalline CdSnO_3 and Cd_2SnO_4 have been obtained by thermal treatment at 300 and 500 deg C,respectively,for 5 h under an inert-gas protecting condition using CdSnO_3 centre dot 3H_2O nanocubes as the precursor.The cube shape of CdSnO_3 centre dot 3H_2O was sustained after thermal decomposition to CdSnO_3.
