Thermodynamics of Phase Transitions of a Kerr Nonlinear Blackbody

We study the thermodynamics of phase transitions of a blackbody whose interior is filled by a Kerr nonlinear crystal. There is a transition temperature To, above which the Kerr nonlinear blackbody is in the normal thermal radiation state, and below which it is in the squeezed thermal radiation state. At To, the Gibbs free energy of the two phases is continuous but the entropy density of the two phases is discontinuous. Hence, there is a jump in the entropy density and this leads to a latent heat density. The photon system undergoes a first-order phase transition from the normal to the squeezed thermal radiation state.     

Precision Higgs physics at the CEPC

The discovery of the Higgs boson with its mass around 125 GeV by the ATLAS and CMS Collaborations marked the beginning of a new era in high energy physics.The Higgs boson will be the subject of extensive studies of the ongoing LHC program.At the same time,lepton collider based Higgs factories have been proposed as a possible next step beyond the LHC,with its main goal to precisely measure the properties of the Higgs boson and probe potential new physics associated with the Higgs boson.The Circular Electron Positron Collider(CEPC)is one of such proposed Higgs factories.The CEPC is an e~+e~- circular collider proposed by and to be hosted in China.Located in a tunnel of approximately 100 km in circumference,it will operate at a center-of-mass energy of 240 GeV as the Higgs factory.In this paper,we present the first estimates on the precision of the Higgs boson property measurements achievable at the CEPC and discuss implications of these measurements.     

供给侧改革视角下的宁夏经济增长动力因素实证研究

通过引入柯布—道格拉斯生产函数模型,对供给侧改革下的宁夏经济增长动力因素进行实证研究.研究结果表明,宁夏整体经济发展的资本拉动作用明显,资本投入对经济的贡献度高于劳动投入,全要素生产率贡献率不高,年均贡献率仅为8.25%.建议可通过促进供给侧要素转变,优化"供给侧"和"需求侧"要素结构及经济结构等方面出发,优化供给侧动力机制,促进宁夏经济增长.     

Cooper Molecules: Second Pairing of Cooper Pairs in Gapless Superconductor CeCoIn_5

We establish a quantum field theory of phase transitions in gapless superconductor CeCoIn5.It is found that uniform Cooper pair gases with pure gradient interactions with negative coefficient can undergo a BardeenCooper-Schrieffer (BCS) condensation below a critical temperature.In the BCS condensation state,bare Cooper pairs with opposite wave vectors are bound into Cooper molecules,and uncoupled bare Cooper pairs are transformed into a new kind of quasiparticle,i.e.,the dressed particles.The Cooper molecule s.ystem is a condensate or a superfluid,and the dressed particle s.ystem is a normal fluid.The critical temperature is derived anal.yticall.y.The critical temperature of the superconductor CeCoIn5 is obtained to be T_c = 2.289 K,which approaches the experimental data.The transition from the BCS condensation state to the normal state is a first-order phase transition.     

大面积闪烁计数器飞行时间在线测量系统

本文描述了由两个大面积闪烁计数器构成TOF测量系统, 选择β>0.98μ子作为单能带电粒子对此系统在200cm飞行距离下进行在线测量, 得到飞行时间t=6.791±0.644ns.     

穿孔翅片的强化传热和流动阻力研究

穿孔翅片是一种高效换热表面.它对于提高空气冷凝器、回热器等的性能具有实际意义。但在发表的文献中,通常把穿孔翅片的传热过程简化成单纯的对流系统,并未注重它的传热实为传导-对流系统这一基本事实,即没有研究穿孔翅片效率的变化及其影响。本文在传导-对流系统下进一步研究穿孔翅片的强化传热及流动阻力并分析比较     

180°连续折转流道的强化传热和阻力特性研究

一、前言 180°连续折转且沿流动方向具有不同截面几何的流道是高温透平叶片中腔典型的冷却结构,在高效换热器及其它高温部件冷却中均有类似的设计。目前,这种复杂流道传热和流动阻力的研究还为数不多,尤其扰流柱在弯曲、变截面流道中强化传热的研究更为少见。本文对扰流柱在180°连续折转、气流依次流经扩展流道、梯形截面     

海平面宇宙线重粒子的质量谱及通量的测量

本文介绍了一个由飞行时间测量系统构成的实验装置, 描述了这个实验装置的各个组成部分和它的性能, 并给出了海平面宇宙射线重粒子的质量谱及通量的测量结果.     

检测LCD阵列用自动探测器

菲利浦研究实验室拟定了几项涉及彩色电视和类似应用的LCD技术及评价计划。该显示从可接通或断开每一象素的薄膜晶体管(TFTs)有源矩阵或阵列为基础。液晶电视(LCTV)需大量器件(一个对角线为6英寸显示器的半分辨率约需135000象素);这是制作无故障阵列的主要问题。阵列器件的一致性显然非常重要;本文论述可对这种一致性做出评价的自动探测器。该探测器也可测试列线、行线的连续性,这是一种比较简单快速的测量。     

多丝正比室正电子照相机系统

本文描述了一个多丝正比室正电子照相机系统.它包括高密度多丝室γ射线探测器,电子学读出系统和计算机数据处理系统.获得了三维空间断层象,象素点阵64×64×16.