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Non-Abelian Topological Excitations in Spinor Condensates

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Chinese Physics Letters 2005年第3期22卷 536-538页

作者：张云波 HarriMaekelae Kalle-AnttiSuominen DepartmentofPhysicsandInstituteofTheoreticalPhysics ShanxiUniversityTaiyuan03006//DepartmentofPhysicsUniversityofTurkuFIN-20014TurunYliopistoFinland DepartmentofPhysics UniversityofTurkuFIN-20014TurunYliopistoFinland

We investigate the topological defects in atomic spin-1 and spin-2 Bose-Einstein condensates by applying the homotopy group theory. With this rigorous approach we clarify the previously controversial identification of symmetry groups and order parameter spaces for the spin-1 case, and show that the spin-2 case provides a rare example of a physical system with non-Abelian line defects, and the possibility to have winding numbers of 1/3 and its multiples.

关键词： BOSE-EINSTEIN CONDENSATE MEDIA DEFECTS multiples SYMMETRY GROUPS Algebraic group theory crystal dislocations Bose-Einstein condensates

Unfolded protein response in myelin disorders

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Neural Regeneration Research 2020年第4期15卷 636-645页

作者： Wensheng Lin Sarrabeth Stone Department of Neuroscience University of MinnesotaMinneapolisMNUSA Institute for Translational Neuroscience University of MinnesotaMinneapolisMNUSA

Activation of the unfolded protein response in response to endoplasmic reticulum stress preserves cell viability and function under stressful ***,persistent,unresolvable activation of the unfolded protein response can trigger apoptosis to eliminate stressed *** studies show that the unfolded protein response plays an important role in the pathogenesis of various disorders of myelin,including multiples sclerosis,Charcot-Marie-Tooth disease,Pelizaeus-Merzbacher disease,vanishing white matter disease,spinal cord injury,tuberous sclerosis complex,and hypoxia-induced perinatal white matter *** this review we summarize the current literature on the unfolded protein response and the evidence for its role in the pathogenesis of myelin disorders.

关键词： axon ER multiples sclerosis myelin oligodendrocyte Schwann cell spinal cord injury UPR

Three—Wave Resonant Interactions in Self—Defocusing Optical Media

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Chinese Physics Letters 2003年第8期20卷 1279-1282页

作者：崔维娜黄国翔孙春柳 DepartmentofPhysicsandKeyLaboratoryforOpticalandMagneticResonanceSpectroscopy EastChinaNormalUniversityShanghai200062

A three-wave resonant interaction for nonlinear excitations created from a continuous-wave background is shown to be possible in an isotropic optical medium with a self-defocusing cubic nonlinearity. Under suitable phase-matching conditions the nonlinear envelope equations for the resonant interaction are derived by using a method of multiple-scales. Some explicit three-wave solitary wave and lump solutions are discussed.

关键词： optical media Resonant interactions multiples nonlinearity Continuous wave Localized Masses

EMPIRICAL BAYES TEST OF REGRESSION COEFFICIENT IN A MULTIPLE LINEAR REGRESSION MODEL

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Acta Mathematicae Applicatae Sinica 1990年第3期6卷 251-262页

作者： WEI Laisheng University of Science&Technology of China

Recently R. S. Singh has studied the empirical Bayes (EB) estimation in a multiple linearregression model. In this paper we consider the EB test of regression coefficient β for this model. Wework out the EB test decision rule by using kernel estimation of multivariate density function and itsfirst order partial derivatives. We obtain its asymptotically optimal (a. o.) property under thecondition E||β||_1 0

关键词： simple regression (model) regression coefficients multiples decision rule regression dimensions Bayes multiple regression model Linear Regression Density functions

Multiple attenuation using λ-f domain high-order and high-resolution Radon transform based on SL0 norm

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Applied Geophysics 2019年第4期16卷 473-482,560,561页

作者： Sun Wen-Zhi Li Zhen-Chun Qu Ying-Ming Li Zhi-Na School of Geosciences China University of PetroleumQingdao 266580China.

Radon transform is to use the speed difference between primary wave and multiple wave to focus the difference on different"points"or"lines"in Radon domain,so as to suppress multiple ***,the limited migration aperture,discrete sampling,and AVO characteristics of seismic data all will weaken the focusing characteristics of Radon *** addition,the traditional Radon transform does not take into account the AVO characteristics of seismic data,and uses L1 Norm,the approximate form of L0 Norm,to improve the focusing characteristics of Radon domain,which requires a lot of *** this paper,we combine orthogonal polynomials with the parabolic Radon transform(PRT)and find that the AVO characteristics of seismic data can be fitted with orthogonal polynomial *** allows the problem to be transformed into the frequency domain by Fourier transform and introduces a new variable,lambda,combining frequency and *** overall sampling of lambda,the PRT operator only needs to be calculated once for each frequency,yielding higher computational *** sparse solution of PRT under the constraints of the smoothed L0 Norm(SL0)obtained by the steepest descent method and the gradient projection *** and real examples are given to demonstrate that the proposed method has This method has advantages in improving the Radon focusing characteristics than does the PRT based on L1 norm.

关键词： SL0 norm orthogonal polynomial multiples AVO high-resolution

A predictive deconvolution method for non-white-noise refl ectivity

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Applied Geophysics 2019年第1期16卷 101-115页

作者： Wang De-Ying Kong Xue Dong Lie-Qian Chen Li-Hua Wang Yong-Jun Wang Xiao-Chen College of Earth Science and Engineering Shandong University of Science and TechnologyQingdao 266590China China University of Petroleum Shengli College Dongying 257061China BGP CNPCZhuozhou 072751China Network and Information Center Shandong University of Science and TechnologyQingdao 266590China

Conventional predictive deconvolution assumes that the reflection coefficients of the earth conform to an uncorrelated white noise sequence. The Wiener-Hopf (WH) equation is constructed to solve the filter and eliminate the correlated components of the seismic records, attenuate multiples, and improve seismic resolution. However, in practice, the primary refl ectivity series of fi eld data rarely satisfy the white noise sequence assumption, with the result that the correlated components of the primary reflectivity series are also eliminated by traditional deconvolution. This results in signal distortion. To solve this problem, we have proposed an improved method for deconvolution. First, we estimated the wavelet correlation from seismic records using the spectrum-modeling method. Second, this wavelet autocorrelation was used to construct a new autocorrelation function which contains the correlated components caused by the existence of multiples and avoids the correlated components of the primary reflectivity series. Finally, the new autocorrelation function was brought into the WH equation, and the predictive fi lter operator was calculated for deconvolution. In this paper, we have applied this new method to simulated and field data processing, and we have compared its performance with that of traditional predictive deconvolution. Our results show that the new method can adapt to non-white refl ectivity series without changing the statistical characteristics of the primary reflection coefficient series. Compared with traditional predictive deconvolution, the new method reduces processing noise and improves fidelity, all while maintaining the ability to attenuate multiples and enhance seismic resolution.

关键词： Non-white reflectivity series predictive deconvolution spectrum-modeling multiples resolution autocorrelation

Effects of Financial Market Variables on Stock Prices:A Review of the Literature

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Journal of Modern Accounting and Auditing 2018年第11期14卷 597-610页

作者： Fatima Ruhani Md.Aminul Islam Tunku Salha Tunku Ahmad Muhammad Ruhul Quddus University Malaysia Perlis PerlisMalaysia Saad Musa Industrial Group ChittagongBangladesh

Stock market plays a pivotal role in firms’expansion and turns economic *** the literature,because of the importance of stock markets to the real economy,the smooth and risk-free operation of the stock market has attracted significant *** finance literature contains a large number of studies that examine the stock price behaviour with some emphasis on the determinants of the relationship between the equity prices and the financial market *** present study reviews the previous works of the effect of financial market variables and stock *** selected financial market variables,market capitalization,earnings per share,price earnings multiples,dividend yield,and trading volume are reviewed in this *** the past literature,there are the opinions of the positive significant relationship between market capitalization and stock *** find the relationship between dividend yield and stock price,there are two broad schools of *** of the relevance and irrelevance theory of Gordon and Modigliani have the strong evidence in the current literature that keeps on the dilemma and provides the scopes for future ***-earnings multiples are analyzed in the past literature by using different *** on that,it is evidenced that price-earnings multiples have a negative significant effect on stock *** reviewed studies state the cointegrating relationship between the stock price and the trading volume as the trading volume is a source of risk.

关键词： market capitalization dividend yield Gordon model Modigliani and Miller model earnings per share price earnings multiples trading volume and stock price