基于OpenFIow协议的MSE设备实现方法研究

基于OpenFlow协议与MSE设备的技术原理研究,重点分析OpenFlow 与MSE 实现的关键技术,在对二者进行分析比较的基础上,提出了MSE设备基于OpenFlow协议向SDN架构演进的可行思路。     

Transport properties of a ladder with two random dimer chains

We investigate the transport properties of a ladder with two random dimer (RD) chains. It is found that there are two extended states in the ladder with identical RD chains and a critical state regarded as an extended state in the ladder with pairing RD chains. Such a critical state is caused by the chiral symmetry. The ladder with identical RD chains can be decoupled into two isolated RD chains and the ladder with pairing RD chains can not. The analytic expressions of the extended states are presented for the ladder with identical RD chains.     

ZnO nanorod arrays with tunable size and field emission properties on an ITO substrate achieved by an electrodeposition method

In the present work,vertically aligned ZnO nanorod arrays with tunable size are successfully synthesized on nonseeded ITO glass substrates by a simple electrodeposition method.The effect of growth conditions on the phase,morphology,and orientation of the products are studied in detail by X-ray diffraction(XRD),scanning electron microscopy(SEM),and transmission electron microscopy(TEM).It is observed that the as-prepared nanostructures exhibit a preferred orientation along c axis,and the size and density of the ZnO nanorod can be controlled by changing the concentration of ZnCl2.Field emission properties of the as-synthesized samples with different diameters are also studied,and the results show that the nanorod arrays with a smaller diameter and appropriate rod density exhibit better emission properties.The ZnO nanorod arrays show a potential application in field emitters.     

Wigner function and the entanglement of quantized Bessel—Gaussian vortex state of quantized radiation field

A new kind of quantum non-Gaussian state with vortex structure, termed Bessel-Gaussian vortex state, is constructed, which is an eigenstate of sum of squared annihilation operators a² + b². The Wigner function of the quantum vortex state is derived and exhibits negativity which is an indication of nonclassicality. It is also found that quantized vortex state is always in entanglement. And a scheme for generating such quantized vortex states is proposed.     

基于OpenGL与3DS Max的三维场景建模

介绍了如何利用OpenGL技术与3DS Max软件快速地构建三维场景,并对3DS模型在OpenGL程序中的应用作了介绍。通过降低OpenGL建立复杂三维模型的难度,减少建模的工作量。通过利用专业建模软件3DS Max的优点,较快地建立复杂的模型,并利用OpenGL的编程接口对建立的模型进行实时绘制和交互控制,降低建模时间,加快系统开发进程。     

关于“世界力学家大会”和“国际理论与应用力学联合会”

第23届世界力学家大会（International Congress of Theoretical andApplied Mechanics简称ICTAM）将于2012年8月19—24日在北京召开,这是四年一届的世界力学家的盛会．今年夏天来自世界各地的著名力学家将汇聚北京,宣读和交流他们在力学理论和应用的各个领域所取得的最新研究成果．作为力学界的“奥林匹克大会”首次在中国举行,表明中国力学研究的成果已经在国际上引起广泛关注和认可．     

低密度脆性微流星体撞击航天器防护结构损伤效应研究

采用硅酸盐质弹丸模拟低密度脆性微流星体,开展了航天器典型Whipple 防护结构撞击实验研究,获得了低密度微流星体弹丸损伤模式和损伤规律,实验表明,当弹丸撞击速度在1.1~1.4 km/s,前板损伤模式从花瓣式开裂转变为穿孔,当速度为1.4 km/s 时后板鼓包头上出现裂纹;随着弹丸速度的进一步增加,后板出现剥落现象,并形成花瓣撕裂,当弹丸撞击速度达到1.95 km/s 时后板被击穿,导致防护结构受到破坏.     

新媒体视域下的广播电视新闻采编技巧

新媒体的出现,给传统广播电视新闻行业带来巨大的冲击,传统新闻媒体与新式新闻媒体的竞争日趋白热化。这对新闻采编工作提出了更高的要求。基于此,分析部分广播电视新闻机构新闻采编工作开展状况,阐述新媒体对广播电视新闻采编的影响和新型新闻采编工作模式特点,提出一些采编工作优化策略,以推动新闻采编转型升级。     

pH值对金刚石表面化学镀镍的影响

本文以金刚石颗粒表面化学镀的方法镀覆镍金属层为背景,通过X射线衍射(XRD)、扫描电镜(SEN)等测试手段研究了pH值对镀层的组织、形貌及镀速的影响.结果表明:当镀液的pH值低于10.5时,镀速几乎为零,反应不能发生;pH值在10.5 ～ 12时,镀速随pH值的增加而增大,且镀速增加较快,XRD图谱中有镍峰存在,镍峰随pH值的增加而增强,基体有裸露现象;当pH值在13左右时,镀速较为稳定,镍衍射峰较强,镀层较为均匀,无裸露现象;pH值接近14时,镀层较为粗糙,且有脱落现象.在pH值等于13的条件下二次化学镀,基体表面得到的镀层厚度大约为1.5 μm,镀层致密度较好,且包覆严实.     

基于TDLAS-bLS方法的夏玉米农田氨挥发研究

采用开放光程可调谐二极管激光吸收光谱技术和反向拉格朗日随机扩散模型,通过田间试验,开展基于高时间分辨率数据的农田氨挥发研究,旨在为揭示农田氨挥发的动态变化规律提供新技术新方法。结果表明,TDLAS-bLS法能有效监测农田氨挥发动态,尤其是日内变化规律。豫北平原潮土农田夏玉米追肥后日内氨挥发有两个挥发峰值,分别在9:00和14:00左右,第一个高峰是由于夜晚溶解在露水中的氨气随露水蒸发而再次挥发,第二个高峰受地温和光照影响所致。追肥后氨挥发速率迅速升高,但挥发高峰期持续时间较短,集中于前四天,整个监测期内氨挥发损失约25.3%。TDLAS-bLS法与通气法相比,测定结果有一定差异。