Distributions and correlations of constituent quarks in jets

In the frame of the quark recombination model, we study the momentum distributions and cor- relations of constituent quarks in jets by analyzing the final state hadrons generated by PYTHIA for the hard parton fragmentation processes in vacuum. Parameterizations for the distributions are tabulated.     

2011 年软物质力学高级讲习班简介

由国家自然科学基金委员会数理科学部主办,中国力学学会、北京国际力学中心(BICTAM)协办, 浙江大学承办的软物质力学高级讲习班于2011 年12 月21 27 日在杭州浙江大学举办.      

多层开管毛细管酶反应器的制备及在蛋白质酶切中的应用

以石英毛细管作为酶固定化的载体, 在毛细管内壁上逐步合成树枝形大分子聚酰胺-胺(PAMAM), 再通过交联剂戊二醛将胰蛋白酶直接键合到该大分子的末端氨基上, 并对酶固定化条件进行了优化, 制备了多层酶反应器. 利用该酶反应器对马心细胞色素C等蛋白质进行了酶切, 并对酶切的条件进行了优化. 实验结果表明, 该固定化酶反应器具有较高的酶切效率、良好的重现性和稳定性, 可用于蛋白质组学的研究.     

柔性透明石墨烯膜制备及导电性能研究

本文通过液相化学还原和热还原联合作用制备了柔性透明导电石墨烯膜.阳极氧化铝(AAO)模板在制备过程中既作为抽滤的滤网,又作为热还原处理时支撑石墨烯膜的衬底,制成的柔性透明石墨烯膜对波长为540—840 nm的可见光透光率为80%,面电阻为850 Ω/平方,这与化学气相沉积法制备的石墨烯膜(280—770 Ω/平方)相近,而低于溶液法制备的石墨烯膜(通常是10³—10⁴ Ω/平方).     

基于动态特征融合的粒子滤波目标跟踪算法

提出一种基于动态特征融合的粒子滤波目标跟踪算法。选择具有互补性的灰度直方图和梯度直方图特征共同描述目标模型,然后在目标跟踪过程中,根据特征对目标和背景的区分程度动态地调整每个特征的置信度,对目标模型进行在线动态建模和更新,从而提高目标模型描述的准确度,并进一步提高粒子滤波算法的跟踪精度。实验结果表明:在对典型场景下的目标跟踪过程中,提出的算法比单独使用一种特征的粒子滤波算法具有更高的跟踪精度和更稳定可靠的跟踪性能。     

Evolution of Cooperation in Evolutionary Games for Heterogeneous Interactions

When a population structure is modelled as a square lattice,the cooperation may be improved for an evolutionary prisoner dilemma game or be inhibited for an evolutionary snowdrift game.In this work,we investigate cooperation in a population on a square lattice where the interaction among players contains both prisoner dilemma game and snowdrift game.The heterogeneity in interaction is introduced to the population in two different ways:the heterogenous character of interaction assigned to every player(HCP) or the heterogenous character of interaction assigned to every link between any two players(HCL).The resonant enhancement of cooperation in the case of HCP is observed while the resonant inhibition of cooperation in the case of HCL is prominent.The explanations on the enhancement or inhibition of cooperation are presented for these two cases.     

Knotted Pictures of Hadamard Gate and CNOT Gate

This paper obtains the knotted pictures of Hadamard gate and CNOT gate in terms of surgical operations described in knot theory.     

Thermal Entanglement of a Two-Qubit XXZ Heisenberg Chain with Dzialoshinski-Moriya Interaction

The effect of DziaJoshinski-Moriya （DM） interaction on thermal entanglement of a two-qubit XXZ spin chain in a homogenous magnetic field is investigated. It is found that the DM interaction can enhance thermal entanglement. When D is large enough, the entanglement can exist for larger temperatures and strong magnetic field.     

J/ψ→μ^＋μ^- reconstruction in the CMS experiment

In this paper the J/ψ→μ^＋μ^- reconstruction performance in the CMS experiment at the LHC is studied in detail by using B8→J/ψφ→μμKK events. The reconstruction efficiencies of J/ψ mesons and their decay muons are obtained as a function of the transverse momentum PT and the pseudo-rapidity η. We also study the muon trigger efficiency for this channel with the planned Level-1 trigger and High Level Trigger selection criteria. It was observed that the muon reconstruction efficiency decreases when the two decay muons have a small or large 3D angular separation, which further affects the overall J/ψ reconstruction efficiency.     

Study of the RPC-Gd as thermal neutron detector

The BESⅢ ·RPC with Gd coating as thermal neutron detector was designed and constructed. Three prototypes were built with different techniques of producing the gadolinium converter. The performance of the cosmic ray test, the signal and the radiation spectrum were discussed in this paper. Lastly, the efficiency of one prototype with the best performance for detecting the thermal neutron was tested as 8.7%.