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Search for B_c (ns) via the B_c (ns) → B_c (ms) π^+ π^- transition at LHCb and Z^0 factory

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Science china(Physics,Mechanics & Astronomy) 2010年第11期53卷 2019-2024页

作者： KE HongWei 1 & LI XueQian 2.1 school of Science,tianjin {2.,tianjin 300072.china 2.school of Physics,nankai {2.,tianjin 3.0071,china school of Science Tianjin University Tianjin China school of Physics Nankai University Tianjin China

It is interesting to study the characteristics of the whole family of B c which contains two different heavy *** and the proposed Z 0 factory provide an opportunity because a large database of the B c family will be achieved.B c and its excited states can be identified via their decay *** suggested by experimentalists,B-c (ns) → B c +γ is not easy to be clearly measured,instead,the trajectories of π + and π- occurring in the decay of B c (ns) → B c (ms) + π + π( n > m ) can be unambiguously identified,thus the measurement seems easier and more reliable;therefore this mode is more favorable at the early running stage of LHCb and the proposed Z 0 *** this work,we calculate the rate of B c (ns) → B c (ms) + π + π-in terms of the QCD multipole-expansion and the numerical results indicate that the experimental measurements with the luminosity of LHC and Z 0 factory are feasible.

关键词： meson hadronic decay QCD multipole-expansion

On isometric extension problem between two unit spheres

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Science china Mathematics 2009年第10期52卷 2069-2083页

作者： Ding GuangGui school of mathematical Sciences and LPMC,{2., tianjin 3.0071, china school of mathematical Sciences and LPMC Nankai University Tianjin China

In this paper we introduce the isometric extension problem of isometric mappings between two unit spheres. Some important results of the related problems are outlined and the recent progress is mentioned.

关键词： normed space isometric extension isometric mapping 1-Lipschitz mapping 46A2. 46B02 46B04 46B2. 46B2.

Split-plot designs with general minimum lower-order confounding

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Science china Mathematics 2010年第4期53卷 939-952页

作者： WEI JiaLin 1,4,YANG JianFeng 1,LI Peng 3 & ZHANG RunChu 1,2.1 school of mathematical Sciences and LPMC,{2. university,tianjin 3.0071,china 2.KLAS and school of Mathematics and Statistics,Northeast Normal university,Changchun 13002.,china 3.school of mathematical Sciences,Capital Normal university,Beijing 100037,china 4 school of Sciences,tianjin university of Commerce,tianjin 300134,china school of mathematical Sciences and LPMC Nankai University Tianjin China school of Sciences Tianjin University of Commerce Tianjin China school of mathematical Sciences Capital Normal University Beijing China KLAS and school of Mathematics and Statistics Northeast Normal University Changchun China

Split-plot designs have been widely used in industrial *** to now,most methods for choosing this kind of designs are based on the minimum aberration (MA) ***,by introducing a new pattern,called aliased effect-number pattern (AENP),Zhang et *** a general minimum lowerorder confounding (denoted by GMC for short) criterion and established a general minimum confounding (also denoted by GMC for saving notations) *** is proved that,the GMC criterion selects optimal designs in a more elaborate manner than the existing ones,and when an experimenter has a prior about the importance ordering of factors in experiments the GMC designs are better than other optimal *** this paper we extend the GMC criterion to the split-plot design case and give a GMC-FFSP criterion for ranking split-plot *** comparisons of the new criterion with the MA-MSA-FFSP criterion are given,and the optimal 32.run split-plot designs up to 14 factors under the two criteria are tabulated for comparison and application.

关键词： fractional factorial design GMC criterion minimum aberration split-plot

Brake subharmonic solutions of first order Hamiltonian systems

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Science china Mathematics 2010年第10期53卷 2719-2732页

作者： LI Chong & LIU ChunGen school of mathematical Sciences and LPMC,{2. university,tianjin 3.0071,china school of mathematical Sciences and LPMC Nankai University Tianjin China

In this paper,we mainly use the Galerkin approximation method and the iteration inequalities of the L-Maslov type index theory to study the properties of brake subharmonic solutions for the first order non-autonomous Hamiltonian *** prove that when the positive integers j and k satisfy the certain conditions,there exists a jT-periodic nonconstant brake solution zj such that zj and zkj are distinct.

关键词： brake subharmonic solution L-Maslov type index Hamiltonian systems

A theorem of Fong's type for graded algebras

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Science china Mathematics 2005年第5期48卷 577-582页

作者： FAN Yun & ZHU Ping school of Mathematics and Statistics, Central china Normal {2., Wuhan 430079, china school of mathematical Science, nankai university, tianjin 3.0071, china school of Mathematics and Statistics Central China Normal University Wuhan China school of mathematical Science Nankai University Tianjin China

Let G be a finite p-solvable group and k be an algebraic closed field of characteristic p. It is proved that any projective indecomposable module of a G-graded k-algebra is an induced module of a module of the subalgebra graded by a Hall p′-subgroup. A necessary and sufficient condition for the indecomposability of an induced module from a Hall p′-subgroup is obtained.

关键词： group graded algebra indecomposable induced module primitive idempotent.

The mechanism of breakdown in laminar-turbulent transition of a supersonic boundary layer on a flat plate-temporal mode

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Science china(Physics,Mechanics & Astronomy) 2005年第5期48卷 614-625页

作者： HUANG Zhangfeng 1, CAO Wei 1,2.& ZHOU Heng 1,2.1. Department of Mechanics, tianjin university, tianjin 300072. china 2. Liu-Hui Center of Applied Mathematics, nankai university and tianjin university, tianjin 300072. china Department of Mechanics Tianjin University Tianjin China Liu-Hui Center of Applied Mathematics Nankai University and Tianjin University Tianjin China

Temporal mode direction numerical simulation has been done for the transition of a supersonic boundary layer on a flat plate with Mach number 4.5. Analysis of the result showed that during the breakdown process in laminar-turbulent transition, the mechanism causing the mean flow profile to evolve swiftly from laminar to turbulent was that the modification of mean flow profile by the disturbances,when they became larger,led to a remarkable change of its stability characteristics. Though the most unstable T-S wave was of second mode for laminar flow, the first mode waves played the key role in the breakdown process in laminar-turbulent transition.

关键词： supersonic boundary layer, transition, breakdown.

Weak minimum aberration and maximum number of clear two-factor interactions in 2.(IV)^(m-p)designs

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Science china Mathematics 2005年第11期48卷 1479-1487页

作者： YANG Guijun,LIU Minqian & ZHANG Runchu Department of Statistics, tianjin university of Finance and Economics, tianjin 3002.2. china Department of Statistics, school of mathematical Sciences and LPMC, nankai university, tianjin 3.0071, china Department of Statistics Tianjin University of Finance and Economics Tianjin China Department of Statistics School of Mathematical Sciences and LPMC Nankai University Tianjin China

Both the clear effects and minimum aberration criteria are the important rules for the design selection. In this paper, it is proved that some 2.Vm-p designs have weak minimum aberration, by considering the number of clear two-factor interactions in the designs. And some conditions are provided, under which a 2.Vm-p design can have the maximum number of clear two-factor interactions and weak minimum aberration at the same time. Some weak minimum aberration 2.Vm-p designs are provided for illustrations and two non-isomorphic weak minimum aberration 2.V13-6 designs are constructed at the end of this paper.

关键词： clear weak minimum aberration resolution wordlength pattern.

Detection and analysis of bovine foamy virus infection by an indicator cell line

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Acta Pharmacologica Sinica 2007年第7期28卷 994-1000页

作者： Zhe MA~(2.4),Wen-tao QIAO~(2.3,4),Cheng-hao XUAN~2.Jin-hui XIE~3,Qi-min CHEN~(2.3),Yun-qi GENG~(2.3,5)~2.Laboratory of Molecular Virology,College of Life Sciences,nankai university,{2. 3.0071,china ~3{2. Key Laboratory of MicrobialFunctional Genomics,nankai university,{2. 3.0071,china Laboratory of Molecular Virology College of Life Sciences Nankai University Tianjin China tianjin Key Laboratory of Microbial Functional Genomics Nankai University Tianjin China

Aim:To determine the infectivity and replication strategy of bovine foamy virus(BFV) in different cultured cells using the BFV indicator cell line (BICL) ***:BFV infection was induced by the co-culture method or the transienttransfection of the infectious BFV plasmid [pCMV (cytomegalovirus)-BFV] *** infectivity of BFV was monitored by the percentage of green fluorescentprotein-positive cells in the *** effect of reverse transcriptase inhibitorzidovudine (AZT) on BFV replication was also evaluated in the ***:The titer of BFV in fetal bovine lung cells was 4-5-folds more than that in either2.3T or HeLa (Cells from Henrietta lacks) cells using the co-culture method,and inthe meantime was significantly higher than that produced by the infectious clonepCMV-BFV in the same *** had only a minor effect on viral titers whenadded to cells prior to the virus *** contrast,viral titers reduced sharplyto the level of the negative control when the virus was produced from cells in thepresence of ***:BICL can be used for the titration of the BFV viralinfection in non-cytopathic *** addition,we proyide important evi-dence to show that reverse transcription is essential for BFV replication at a latestep of viral infection.

关键词： bovine foamy virus indicator cell line AZT co-culture green fluorescent protein

A Four-filtrated May Spectral Sequence and Its Applications

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Acta Mathematica Sinica,English Series 2008年第9期24卷 1507-1524页

作者： Xiu Gui LIU Xiang Jun WANG school of mathematical Sciences and LPMC,{2. university,tianjin 3.0071,P.R.china school of mathematical Sciences and LPMC Nankai University Tianjin P. R. China

In this paper, we introduce a four-filtrated version of the May spectral sequence (MSS), from which we study the general properties of the spectral sequence and give a collapse theorem. We also give an efficient method to detect generators of May E 1-term E 1 s,t,b,* for a given (s, t, b, *). As an application, we give a method to prove the non-triviality of some compositions of the known homotopy elements in the classical Adams spectral sequence (ASS).

关键词： stable homotopy groups of spheres Adams spectral sequence May spectral sequence