LBE–DEM simulation of inter-phase heat transfer in gas–solid cross jets

Lattice-Boltzmann equation(LBE)–Discrete element method(DEM)coupled simulation of a twodimensional gas–solid cross jet is performed,focusing on the gas-particle two-way coupling effect on heat transfer characteristics.The Reynolds number is 1000,and particle Stokes numbers are 10,25,and 50 under the same number flow rate of particles.The gas phase temperature field and particle distribution as well as the inter-phase heat transfer characteristics are studied and analyzed.The dominating effects,i.e.the mean temperature difference and mean heat transfer coefficient between the gas–solid phases,for the pre-and post-collision stages of the cross jets are illustrated respectively.The change of dominating roles is related to the dynamical response characteristics of particles.     

自学考试本科论文预申请管理系统设计

对自考生的考籍进行有序管理一直是自学考试工作的重要部分.一些学校自考生在籍考生人数众多,考籍管理工作非常复杂.随着自考生报考数量逐年增加,论文申请、毕业申请人数迅速上升,受理各类申请的工作压力也越来越大.建设网上论文预申请管理系统,充分利用信息化平台,对论文申请资格进行自动预审核,可以减轻工作压力,提高工作效率,同时还可以对考生考籍信息进行数据处理和分析,为自考专业的发展、政策的制定提供数据支持.     

Generation of polarization-entangled photon pairs in a cold atomic ensemble冷原子系综中偏振纠缠光子对的产生

We report an experimental generation of polarization-entangled photon pairs in a cold atomic ensemble. A single Stokes photon and one spin-wave excitation are simultaneously created via spontaneous Raman scattering. The spin-wave excitation is then converted into an anti-Stokes photon via an electromagnetic-induced-transparency reading process. The measured cross-correlation functions between the Stokes and anti-Stokes photons for two orthogonal polarizations are ~75 and 74, respectively, at a generation rate of the photon pair of ~60/s. Based on such correlations, we obtain polarization-entangled photon pairs, whose Bell parameter is S = 2.77 ±0.01, violating Bell-CHSH inequality by ~77 standard deviations. The presented polarization-entangled photon source has high entanglement degree and fast generation rate, which will promise us to apply it in future quantum repeater.     

High Temperature Properties and Microstructures of Si_3N_4 with AZ-Type Non-Toxic, Non-Oxide Additives

A new type of Si3N4 ceramics (ZAN) is developed in our laboratory. Densification of ZAN is promoted by non-toxic, non-oxide AZ-type additives. In this work high temperature (HT) properties and microstructures of ZAN are investigated.     

收益率方程解的存在唯一性及其数值解

本文给出了投资决策中一般形式的收益率方程解的存在性及唯一性的充要条件,同时给出求收益率方程解的几种有效迭代格式。     

350冷连轧机板型最优压下规程研究

本文在分析350mm冷连轧机板型特性的基础上,应用动态规划,为其制定了板型最优的压下规程,并作了较全面的分析。     

x射线照像法测定三方晶系晶体结构的讨论与研究

本文在文献的基础上,对晶体是否属于三方 R 点阵结构的判据,分别从 Laue 方程、结构因子和直观晶面图形三种不同的角度进行了论证,获得了员好的效果。三种方法中,Laue 方程法和直观晶面图形归纳法是文献上所未见过的。     

无毒性非氧化物添加剂的Si_3N_4陶瓷的显微组织

采用ZrN作为添加剂热压烧结的Si_3N_4陶瓷材材料进行了透射电子显微镜观察和能谱EDS分析。观察结果表明:烧结的陶瓷中由于晶界残留的玻璃相数量较少,主要分布在三晶粒间界处,从而显著改善了Si_3N_4材料的高温性能;在这种材料中有许多弥散分布的ZrN相存在,可阻碍裂纹扩展,也起着提高Si_3N_4材料的强度和韧性的作用;用高分辨电子显微术观察到α’-Si_3N_4晶粒中存在不同的超结构。     

金属离子Mg~(2+)和Cd~(2+)对TGS某些性质的影响

本文研究了金属离子Mg~(2+)和Cd~(2+)对TSG和ATGS单晶的介电、热释电和铁电性质的影响。     

试论高等学校图书馆文化建设

从7个方面对搞好图书馆文化建设的有关问题进行了深入的探讨。