An explanation for deviations from the quark number scaling of elliptic flows in low pT region

We carry out a systematic study of the different contributions to the deviations of the elliptic flows from the quark number scaling in high energy heavy ion collision in a quark combination model.The effects that we considered are:the resonance decay,the flavor dependence of the quark elliptic flow and the combination of quarks/antiquarks with slightly different transverse momenta.Our results show that the deviations observed in experiments can be well reproduced within the combination framework if all the three effects are considered. We make a detailed analysis of the different contributions using a Monte-Carlo program and suggest measuring the quark number scaling in intermediate pT range more precisely.     

高功率二极管激光器失效特性研究

利用统计分析手段,对高功率二极管激光器封装中各工艺环节引起器件失效的原因进行了分析和归类.根据几种失效模式的分析结果,焊接空隙、结短路、腔面退化是引起高功率DL失效的主要模式,针对高功率二极管激光器失效的主要模式,对焊料沉积夹具及焊接工艺参数进行了改进和优化,大大提高了封装工艺水平,使封装的器件成品率由原来的77%提高到了85%以上.     

A New Reagent for the Reduction of N-Arylsulfonylimines

Potassiumselenatedborohydride(KBHZSe3),sodiumselenatedborohydride(NaBHZSe3)werepreparedfirstbyLalancetteetall.However,sincethen,therehavebeenlittlereportabouttheirapplication.Wehaveusedpotassiumselenatedborohydrideinformamidetoreducearomaticnitrocompounds,andsuccessfullyobtainedthecorrespondinganilines2.Inaddition,wehavealsoreportedthereductionofarylsulfonylchloridestothecorrespondingdisulfidesbysodiumselenatedborohydriderefluxinginCH,CN'.Fromourresearchwork,KBHZSe3andNaBHZSe3werefou…     

WA, a new Antifungal Antibiotic from a Soil Fungus Strain 38

Inthecourseofourscreeningnewantifungalandanticancercompoundsusingthebioassaysystembasedonmorphologicaldeformationorgrowthinhibiti0n0fPyriculariaoryzae,anovelactivecomPoundWAwasobtainedfromthemetab0litesofthefungusstrain38isolatedfromasoilsample'.ItSminimalinhibitionc0ncentrationwas288.4pglml.InthispaPer,wedescribethephysic0-chemicalpr0pertiesandstructureelucidationofWA.Comp0undWAwasobtainedaswhitep0wderhavingmeltingpointl2ful28"C.Itsm0lecularformula,Cl1HIo04,wasdeterminedbyCI-MS[Inlz20…     

中国陆相油气的形成和运移(Ⅱ)

本文(Ⅰ)着重研究了中国陆相湖盆沉积物中有机质向油气演化的过程.本文(Ⅱ)阐明了现代青海湖沉积物埋藏初期及早期成岩作用过程中有机质的演化特征.其结果表明陆相有机质大量开始向石油转化的深度随不同地区、不同时代、不同类型的有机质而异.最后,运用特征有机化合物、稀有气体同位素等资料,结合构造发展史阐述我国陆相油气运移的类型、规模和途径.指出近油源短距离是陆相油气运移的基本特征.     

引入反比相关双曲余弦平方势描述超晶格量子阱的电子跃迁

 鉴于“方形”势阱过于简单和理想，引入了反比相关双曲余弦平方势描述超晶格量子阱中的电子运动行为。在量子力学框架内，把电子的Schrodinger方程化为了超几何方程, 并以Ga^1-xAl^xAs-GaAs- Ga^1-xAl^xAs量子阱为例计算了电子的带内跃迁和带间跃迁。结果表明，能级数目和跃迁能量与阱深、阱宽等系统参数有关，只需适当调节这些参数就可望实现对超晶格量子阱光电特征的调节与控制。     

Low-Threshold High-Temperature Operation of ～7.4μm Quantum Cascade Lasers

We report low-threshold high-temperature operation of 7.4#m strain-compensated InGaAs/lnAIAs quantum cascade lasers （QCLs）. For an uncoated 22-μm-wide and 2-mm-long laser, the low-threshold current densities, i.e. 0.33kA/cm^2 at 81 K in pulsed mode and 0.64kA/cm^2 at 84K in cw mode, are realized. High-temperature operation of uncoated devices, with a high value of 223K, is achieved in cw mode.     

fficient Scheme for Implementing a Fredkin Gate via Resonant Interaction with Two-Mode Cavity Quantum Electrodynamics

A scheme for implementing a Fredkin gate with an atom sent through a microwave cavity is proposed. The scheme is based on the resonant atom-cavity interaction so that the gating time is sharply short, which is important in view of decoherence.     

Easy Fabrication of Dense Ceramic Membrane for Oxygen Separation

During the past decade, dense-type oxygen-permeable ceramic membranes have received considerable attention both in the fields of scientific research and industrial application1, 2. Such membranes have mixed oxygen-ionic and electronic conductivity, and they can permeate oxygen at high temperature under an oxygen gradient without the need of outside connecting line and electrodes. Envisioned applications range from small scale oxygen pumps for medical use to large scale integrated gasification …     

Synchronization in a Mutualism Ecosystem Induced by Noise Correlation

Understanding the cause of the synchronization of population evolution is an important issue for ecological improvement. Here we present a Lotka-Volterra-type model driven by two correlated environmental noises and show, via theoretical analysis and direct simulation, that noise correlation can induce a synchronization of the mutualists. The time series of mutual species exhibit a chaotic-like fluctuation, which is independent of the noise correlation, however, the chaotic fluctuation of mutual species ratio decreases with the noise correlation. A quantitative parameter defined for characterizing chaotic fluctuation provides a good approach to measure when the complete synchronization happens.