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Spectrum for heavy quarkonia and mixture of the relevant wave functions within the framework of Bethe-Salpeter equation

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Science China(Physics,Mechanics & Astronomy) 2010年第11期53卷 2005-2018页

作者： chang ChaoHsi Department of Physics Harbin Institute of Technology CCAST (world Laboratory) Institute of Theoretical Physics Chinese Academy of Sciences Department of Physics Chongqing University

Considering the fact that some excited states of the heavy quarkonia (charmonium and bottomonium) are still missing in experimental observations and potential applications of the relevant wave functions of the bound states,we re-analyze the spectrum and the relevant wave functions of the heavy quarkonia within the framework of Bethe-Salpeter (B.S.) equation with a proper QCDinspired *** a kernel for the heavy quarkonia,relating to potential of the non-relativistic quark model,is instantaneous,so we call the corresponding *** as BS-In equation throughout the ***,a new way to solve the ***,which is different from the traditional ones,is proposed here,and with it not only the known spectrum for the heavy quarkonia is re-generated,but also an important issue is brought in,i.e.,the obtained solutions of the equation ‘automatically’ include the ‘fine’,‘hyperfine’ splittings and the wave function mixture,such as S-D wave mixing in J PC = 1-states,P-F wave mixing in J PC = 2 ++ states for charmonium,bottomonium *** is pointed out that the best place to test the wave mixture probably is at Z-factory (e + e-collider running at Z-boson pole with extremely high luminosity).

关键词： Bethe-Salpeter equation heavy quarkonium spectrum bound state wave-mixing

THE ADAPTIVE IMMERSED INTERFACE FINITE ELEMENT METHOD FOR ELASTICITY INTERFACE PROBLEMS

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Journal of Computational Mathematics 2012年第6期30卷 629-642页

作者： Yanzhen chang Department of Mathematics Beijing University of Chemical Technology Beijing 100029 China

In this paper, we propose adaptive finite element methods with error control for solving elasticity problems with discontinuous coefficients. The meshes in the methods do not need to fit the interfaces. we establish a residual-based a posteriori error estimate which is λ- independent multiplicative constants; the Lame constant λ steers the incompressibility. The error estimators are then implemented and tested with promising numerical results which will show the competitive behavior of the adaptive algorithm.

关键词： Adaptive finite element method Elasticity interface problems.

Biogenic Amines as Biomarkers for Neurotoxicity

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Biomedical and Environmental Sciences 1991年第1期4卷 207-216页

作者： SYED F.ALI LOUIS w.chang wILLIAM SLIKKER JR Division of Reproductive and Developmental Toxicology National Center for Toxicological Research JeffersonDepartment of Pharmacology and Toxicology Department of Biochemistry and Molecular BiologyDivision of Reproductive and Developmental Toxicology National Center for Toxicological Research JeffersonDivision of Reproductive and Developmental Toxicology National Center for Toxicological Research Jefferson Arkansas 72079-9502 Department of Pharmacology and Toxicology Department of Biochemistry and Molecular BiologyDepartment of Pharmacology University of Arkansas for Medical Sciences Little Rock Arkansas 72205Arkansas 72079-9502 Department of Pharmacology and Toxicology Department of Pediatrics Universtiy of Arkansas for Medical Sciences and Arkansas Children's Hospital Little Rock Arkansas 72205 Arkansas 72079-9502 Department of Pharmacology and Toxicology Department of Pediatrics Universtiy of Arkansas for Medical Sciences and Arkansas Children's Hospital Little Rock Arkansas 72205

There has been a surge of interest over the past several years in the use of neurochemical endpoints to contribute to our understanding of the mechanism of action of neurotoxicants. In our present presentation, two biogenic amine systems were selected as examples of biomarkers for neurotoxicity. To investigate these neurochemical endpoints, two prototype neurotoxicants were evaluated in experimental animals. One agent, reserpine, was used to assess developmental neurotoxicity and administered prenatally, while the other, MDMA, was used in the adult animal. The neurochemical biomarkers measured were dopamine, serotonin, and their metabolite (DOPAC and 5-HIAA) concentrations by HPLC/EC and dopamine receptor binding by radioligand receptor techniques. A review of the background, experimental design, and results are presented in this article. Our findings indicate that components of the biogenic amine systems can be used as sensitive neurochemical biomarkers of neurotoxicity. These neurochemical biomarkers can be correlated with neuropathological and behavioral biomarkers to aid in the understanding of mechanisms of neurotoxicity.

关键词： MDMA Biogenic Amines as Biomarkers for Neurotoxicity oral DOPAC

The magnetic dipole transitions in the (c) binding system

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Science China(Physics,Mechanics & Astronomy) 2010年第11期53卷 2025-2030页

作者： chang ChaoHsi CCAST (world Laboratory) Institute of Theoretical Physics Chinese Academy of Sciences

The magnetic dipole transitions between the vector mesons B-c and their relevant pseudoscalar mesons B c (B c ,B-c ,B c (2S ),B-c (2S ),B c (3S ),B-c (3S ) etc.,the binding states of (c) system) of the B c family are *** ‘hyperfine’ splitting due to spin-spin interaction is an important topic for understanding the spin-spin interaction and the spectrum of the the (c) binding *** knowledge about the magnetic dipole transitions is also very useful for identifying the vector boson B-c mesons experimentally,whose masses are just slightly above the masses of their relevant pseudoscalar mesons B c .Considering the possibility to observe the vector mesons via the transitions at Z 0 factory and the potential use of the theoretical estimate on the transitions,we fucus our efforts on calculating the magnetic dipole transitions,i.e.a precise calculation of the rates for the transitions such as decays B-c → B c γ and B-c → B c e + e-,and particularly work in the Bethe-Salpeter *** a typical example,we carefully investigate the dependence of the rate Γ(B-c → B c γ) on the mass difference ΔM = M B-c-M B c .

关键词： magnetic dipole transitions Bethe-Salpeter

EFFECT OF HEAD SHAPE ON THE ADHESION CAPABILITY OF MUSHROOM-LIKE BIOLOgICAL ADHESIVE STRUCTURES

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Acta Mechanica Solida Sinica 2011年第4期24卷 318-325页

作者： Tienchong chang Shanghai Institute of Applied Mathematics and Mechanics

Theoretical studies have been extensively performed to reveal the mechanism of the biological adhesive structure with a flat ***,most biological adhesive structures have a big *** we investigate the effect of the head shape on the adhesion capability of a mushroomlike adhesion structure based on a finite element *** show that a mushroom-like head produces significant adhesion *** investigate also the effect of the elastic modulus of the adhesive structure on the *** results are consistent with existing experimental results.

关键词： biological adhesion effect of head shape fracture mechanics FEM

genitourinary small-cell carcinoma： 11-year treatment experience

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Asian Journal of Andrology 2014年第5期16卷 705-709,I0007页

作者： Kun chang Department of Urology Fudan University Shanghai Cancer Center Shanghai China Department of Oncology Fudan University Shanghai Cancer Center Shanghai China Department of Pathology Fudan University Shanghai Cancer Center Shanghai China

The predictive factors of prognosis and treatment strategies for small-cell carcinoma （SCC） of the urinary tract are controversial. This study was aimed to investigate the clinical experience and management of patients with SCC of the urinary tract. we collected data of patients who were diagnosed with genitourinary SCC （gSCC） between 2002 and 2013 and were treated in the Fudan University Shanghai Cancer Center. A total of 18 patients were diagnosed with gSCC of which 10 originated from the prostate, seven from the bladder and one from the adrenal gland. The mean follow-up time was 15.5 months and progression-free survival （PFS） was 9.3 months. Primary tumor resection was attempted in 13 of 18 patients （72.2%） in whom radical surgery was performed in six of 14 （42.9%） limited disease patients. Most of the patients （13, 72.2%） received cisplatin-based chemotherapy. Patients who had normal lactic dehydrogenase （LDH） levels showed a significantly higher median PFS and overall survival （OS） compared with patients with high LDH levels （P = 0,030, P = 0.010）. Patients with limited disease treated with a radical operation experienced a non-significant （P = 0,211） longer PFS compared with patients who were not treated, but this reached statistical significance after analyzing OS （P = 0.211, P = 0.039）. Our patients showed a poor prognosis as reported previously. Serum LDH levels beyond the normal range indicate a poor prognosis. For gSCC patients who are diagnosed with limited disease, radical surgery is strongly recommended along.w.th cisplatin-based chemotherapy,

关键词： bladder cancer diagnosis genitourinary small-cell carcinoma prognosis prostate cancer

Sensitive study of the long and short surface wave-induced vertical mixing in a wave-circulation coupled model

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Acta Oceanologica Sinica 2012年第4期31卷 1-10页

作者： ZHAO chang College of Physical and Environmental Oceanography Ocean University of China Qingdao 266100 China Key Laboratory of Marine Science and Numerical Modeling State Oceanic Administration Qingdao 266061 China First Institute of Oceanography State Oceanic Administration Qingdao 266061 China

The previous studies by the MASNUM research team have shown the effectiveness of the wave- induced mixing （By） in improving the simulation of upper-ocean thermal structure. The mech- anisms of Bv are further investigated by incorporating different Bv products into the MASNUM wave-circulation coupled model. First, experiments were designed to explore the effects of By, which contain the contributions at different wave lengths （l）. The results of three experiments, the non-By case, the short-wave case （l 〈300 m）, and the long.w.ve case （l 〉300 m） are compared, and it is found that the long.w.ves are the most important component for By to generate mixing in the upper ocean. As the swell plays dominant role in mixing, the parameterization of Bv into wind may be not a proper way. Second, Bv effects at different time-scales, including daily and monthly, were examined. The results show that the monthly averaged By has larger impact than the daily averaged Bv, especially in summer.

关键词： wave-induced mixing wave-circulation coupled model long surface wave-inducedmixing daily mean wave-induced mixing monthly mean wave-induced mixing

Augmentation Quotients for Complex Representation Rings of generalized Quaternion groups

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Chinese Annals of Mathematics,Series B 2016年第4期37卷 571-584页

作者： Shan chang School of Mathematics Hefei University of Technology

Abstract Denote by Qm the generalized quaternion group of order 4m. Let R（Qm） be its complex representation ring, and △（Qm） its augmentation ideal. In this paper, the author gives an explicit Z-basis for the △n... 详细信息

关键词： generalized quaternion groups Representation ring Augmentation quotients

A Note on the Rank of a Restricted Lie Algebra

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Algebra Colloquium 2018年第4期25卷 653-660页

作者： Hao chang School of Mathematics and Statistics Central China Normal University Wuhan 430079China

In this short note,we study the rank of a restricted Lie algebra(g,[p]),and give some applications which concern the dimensions of non-trivial irreducible *** also compute the rank of the restricted contact algebra.

关键词： restricted Lie algebra rank contact algebra