Measurement of the isospin-filtering dd → 4He K+K- reaction at Q = 39 MeV

The total cross-section for the dd → 4HeK+K− reaction has been measured at a beam momentum of 3.7GeV/c, corresponding to an excess energy of 39MeV, which is the maximum possible atthe Cooler Synchrotron COSY-Jülich. A deuterium cluster-jet target and the ANKE forward magnetic spectrometer, placed inside the storage ring, have been employed in this investigation. We find a total cross-section of σtot < 14 pb, which brings into question the viability of investigating the dd → 4He a0(980)reaction as a means of studying isospin violation

Research on the Nonlinear Relation of City Scale and Economic Growth under the Constraint of Urban Household Registration

利用2000年~2010年31个省市城市规模与经济增长的相关数据,构建门槛回归模型,探讨户籍管制下城市规模与经济增长的动态发展过程。研究发现:户籍管制的确构成了城市规模的发展瓶颈,过高的户籍管制导致城市规模与经济增长的负相关,而过低的户籍管制则影响城市规模对经济增长的带动作用;进一步结合样本分布的时空特征,指出户籍约束而非过度城市化导致了现阶段城市规模的低效率集聚。城市规模与经济增长的非线性关系,应该通过户籍改革加快城市化进程,并制定合理的户籍管制政策,防止户籍管制过低或过高对经济增长造成不利影响。Using 31 provinces' relevant data of city scale and economic growth from 2000 to 2010,this paper builds a threshold regression model to investigate the dynamic development process of urban household size and economic growth.It finds that: household control does constitute a bottleneck for the development of city scale,and too-high household control leads to the negative correlation of city size with economic growth,while too-low household control cannot maximize the driving role of city size in economic growth.The further integration of spatial and temporal characteristics of the sample distribution shows that it is the household constraint rather than the excessive urbanization that has led to the low efficiency of urban-scale gathering stage.The nonlinear relation between city size and economic growth should accelerate the process of urbanization through household registration reforms,and reasonable household regulatory policies should be developed to prevent the adverse effect of too-low or too-high household control on economic growth.国家社会科学基金项目(12BJL021

Luminosity determination for the dd→αK+K-experiment atANKE/COSY

High resolution studies of a0/f0(980) decays into channels involving open strangeness are currently being performed at COSY-Jülich. As a “filter” for isospin-zero intermediate states, i.e. to selectively produce the f0(980) resonance, the dd→αK+K− reaction was measured with the magnetic ANKE spectrometer. In order to determine the luminosity of this experiment, the elastically and quasi-elastically scattered deuterons were recorded simultaneously with the αK+K− events. Here we report about the luminosity determination via investigating the (quasi-) elastic deuterons at ANKE

深度学习在流程工业过程数据建模中的应用

深度学习是近年来发展的人工智能技术。相比于传统浅层学习模型，深度学习具有强大的特征表示和函数拟合能力。深度学习能够从海量数据中提取层次特征，其在流程工业过程数据驱动建模中具有较大的潜力和应用前景。首先简单介绍了深度学习的发展历程；然后，介绍了4类广泛使用的深度学习模型以及它们在流程工业过程数据建模中的应用；最后，在流程工业过程数据建模领域对深度学习进行了简要总结

甲醇制烯烃（MTO）流化床反应器的CFD-DEM模拟：一种积炭分布理论模型的验证

CFD-DEM Simulation of MTO Fluidized Bed Reactor: Validation of a Theoretical Model for Coke Distributio

一个用于MTO流化床反应器放大的机理反应动力学模型

A Mechanistic Kinetic Model for Scaling up MTO Fluidized bed reacto

SAPO-34 催化剂上流化床 MTO 反应失活行为研究

Deactivation Behavior of Methanol-to-Olefins Reaction over SAPO-34 Catalyst in Fluidized Bed Reacto

基于嵌入式系统的PCE硬件设计及实现

介绍一个基于嵌入式Linux的PCE（路径计算单元）硬件系统设计及实现实例,其主要目的是用于光网络中"PCE+网管"架构的测试,也可用于多域多层异构光网络设备间的互联互通及路径计算。考虑到PCE开发需求及嵌入式系统的特点,为硬件系统的使用者预先载入板级支持包,完成硬件的启动引导。文中首先根据该PCE架构的需求比较了主流嵌入式Linux操作系统的异同及优缺点,然后就硬件系统的设计、实现和初始化做了详细的阐述,最后给出了一个可以成功运行的PCE测试实例及部分实验成果

单分散中空聚苯乙烯微球制备

采用搅拌乳化方法制备水包油（W1／O）型乳状液，经膜乳化法制得单分散的复乳（W1／O／W2）型乳状液，再通过液中干燥法制得单分散中空聚苯乙烯（PS）微球。考察了shirasu porous glass（SPG）膜孔径对乳状液液滴粒径及粒径分布、表面活性剂浓度对PS微球中空率和单分散性的影响。由激光粒度分析仪结果及PS微球的SEM照片证实，制得的PS微球，粒径呈单分散，是SPG膜孔径的2．0～2．4倍且具有中空结构

膜乳化技术及其应用

膜乳化作为一种新型的乳状液制备技术,可以制备各种类型粒径的单分散乳状液.膜乳化过程所需能耗较低、条件温和,在食品乳状液、药物控释系统、单分散微球（囊）的制备等诸多领域有着广泛的应用前景.本文对膜乳化技术的原理及应用研究进展作了综述