Heat Transfer Problems Induced By Multi-shocks Interaction

Numerical simulations of the multi-shock interactions observable around hypersonic vehicles were carried out by solving Navier-Stokes equations with the AUSMPW scheme and the new type of the IV interaction created by two incident shock waves was investigated in detail. Numerical results show that the intersection point of the second incident shock with the bow shock plays important role on the flow pattern, peak pressures and heat fluxes. In the case of two incident shocks interacting with the bow shock at the same position, the much higher peak pressure and more severe heat transfer rate are induced than the classical IV interaction. The phenomenon is referred to as the multi-shock interaction and higher requirements will be imposed on thermal protection systems.

P-选择素CR结构域功能的模拟预测

<正>选择素(selectin)与其配体间相互作用介导的细胞粘附在炎症级联反应、肿瘤转移和淋巴细胞归巢等病理、生理过程中起重要作用。其结构组成从远离细胞表面的N-末端到胞内C-末端,依次为:钙型凝集素功能区(Calcium-type lectin domain,Lec),类上皮生长因子功能区(Epidermal Growth Factor-like module,EGF),具有粘附补体蛋白作用的多个重复序列(Consensus Repeats,CRs),跨膜区(Transmembrane,TM)和胞内区

整合素-ICAM-1相互作用的二维反应动力学研究

<正>_2整合素(LFA-1和Mac-1)与其配体细胞间粘附分子-1(ICAM-1)的相互作用在诸如肿瘤转移、炎症反应等许多病理生理过程中起着重要的作用。研究表明,中性粒细胞(PMN)在特定环境下可通过_2整合素与ICAM-1的相互作用而增强黑色素瘤细胞的转移能力,但是其动力学调控机制还不清楚。受体-配体键结合和解离的二维反应动力学定量描述了分子结合的快慢和强弱,是回答_2整合素与ICAM-1相互作用如何调

ECR离子源高电荷态金属离子产生的MIVOC法实验研究

为满足兰州重离子加速器的实验要求,先后在中国科学院近代物理研究所14.5GHz(LECR2)及10GHz+14.5GHz(LECR3)高电荷态ECR离子源上使用MIVOC(Metallic ion fromvolatile compounds)方法进行了高电荷态金属离子产生的实验研究。主要研究了铁和镍的各种高电荷态离子的产生,具有代表性的是210eμA的Fe11+、175eμA的Fe12+、142eμA的Fe13+、25eμA的Fe16+、64eμA的Ni10+、57eμA的Ni13+、31eμA的Ni15+和15eμA的Ni16+。本文将分别给出两种金属离子产生的多电荷态束流谱图,并对实验装置的安排、实验现象及结果进行讨论与总结。

敦煌莫高窟室内外空气质量的初步研究

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纯金属Bi中高能重离子辐照效应

利用高能重离子（Ｋｒ， Ｘｅ， Ｓｎ和Ｐb ）辐照处于 １６或 １００ Ｋ的低熔点纯金属 Ｂｉ，通过测量分析辐照引起的样品电阻率增量及其变化速率随辐照剂量的变化，研究了入射离子在Ｂｉ中引起的辐照损伤效应如辐照损伤效率及复杂缺陷的产生等．结果表明，强的电子能损可在纯金属Ｂｉ中引起附加缺陷的产生，从而使得辐照损伤效率＞１．电子能损值大时，入射离子在Ｂi中引起的辐照效应主要是电子能损效应．辐照温度和入射离子速度对辐照效应的强弱有一定的影响．

Preparation and characterization of CdS nanotubes and nanowires by electrochemical synthesis in ion-track templates

CdS nanotubes and nanowires have been synthesized with controlled dimensions by means of template-electrodeposition method in etched ion-track membranes. The diameters of nanotubes and nanowires are between 20 and I 10 nm, and the lengths are up to tens of micrometers. X-ray diffraction (XRD) and selected area electron diffraction (SAED) pattern investigations demonstrate that CdS nanotubes and nanowires are polycrystalline in nature. The UV-vis absorption spectra of CdS nanotubes and nanowires embedded in polycarbonate (PC) membranes show that the absorption edges of PC films shift towards the shorter wavelength, with decreasing diameters of the deposited nanostructures. The results indicate that nanowires are formed from nanotubes by nanotube-stuffing-growth mechanism.

Design of a 7 T Superconducting Magnet for Lanzhou Penning Trap

A penning trap system called LPT (LANZHOU PENNING TRAP) is now being developed for precise mass measurements in IMP (Institute of Modern Physics). The most key component of LPT is a superconducting magnet. A Phi 156 mm warm bore and two cylinder good field regions with a distance of 220 mm are required for trapping ions and measurements. As the required homogeneity is better than 0.5 ppm, several complicated coaxial coils are used to produce such a magnetic field. The size and position of these coils are optimized by using a method combining linear program with multiobjective optimization. Superconducting shim coils and passive shim pieces are used to eliminate inevitable winding tolerances and environmental influence. The fringe field is decreased to 5 Gs at 2 m line from the center of the magnet by active shielding coils. The designs of the mechanical structure, the quench protection system are also introduced in this paper.

《中国沙地森林生态系统》评介

沙地森林是分布我国草原地区沙地上的大（中）高位芽植物为建群种形成的森林群落．由于其独特的生态条件、丰富的生物多样性和重要的生态系统功能，对我国北方防风固沙、控制土地沙漠化，改善当地农牧区人民生活环境以及三北防护林体系建设发挥巨大的生态效益、经济效益和...