子母战斗部系统仿真平台设计与实现

采用模块化软件设计思想,利用Visual C++基于windows系统开发了子母战斗部多种模型算法模块、数据库模块、可视化界面模块,建立了一种具有通用性和易扩展性的子母战斗部系统仿真平台。在该平台上对某子母战斗部系统进行了仿真研究,仿真结果表明该仿真平台性能可靠、结果可信度较高。子母战斗部系统仿真平台的建立,为子母战斗部系统的研制、开发提供了数字化平台,具有广泛的应用前景。     

Ballistic transport in nanoscale self-switching devices

Using the Monte Carlo method, a type of semiconductor nano-device called self-switching device (SSD), which has diode-like I–V characteristics, was simulated. After analyzing the microscopic transport behavior of the carriers, we show that the ballistic effects exist in the SSDs when the channel length of the device is extremely short (∼120 nm). Furthermore, we show that the ballistic effect doubles the average drift velocity of the carriers (to ∼6.0×10⁷ cm/s) in short-channel SSDs, which decreases the transit time. This implies that when the dimensions are decreased to nanoscale length, the SSD can operate much faster because the ballistic effect increases the operation speed of the device. Moreover, because of the ballistic transport, the energy efficiency may also be improved.     

Physical Characteristics of Knitted Polyester Vascular Prostheses： Can the Wall Be Considered as a Scaffold for Tissue Regeneration？

Recent developments in endovascular surgery (EVAR) have opened new avenues to successfully treat aneurysms with percutaneous deployment of stent-grafts.Manufacturers have preferred to use woven fabrics or micro-porous tubes which are supported by metallic frames or stents.Woven fabrics are much thinner than knits and this permits the use of a smaller delivery catheter.However,since woven constructions are stiffer and have little porosity,the tissue ingrowth is poor or absent.On the other hand,knitted constructions can be considered as a scaffold for tissue ingrowth,and hence they represent an attractive alternative because of their open structure and better conformability in the case of balloon deployment.The present study was undertaken to analyze the properties of two knitted and crimped polyester arterial prototype prostheses,one with and the other without a gelatin coating as sealant.Two commercial controls were also included in the study,namely the uncoated knitted polyester vascular prosthesis VP1200K,and its sealed version,the gelatin coated polyester knitted Gelsoft device,manufactured by Vascutek Ltd.,Scotland,UK.In vitro testing consisted of analyzing the geometry and morphology of the yarn and fabric structures,and measuring the physical and mechanical properties of the grafts,including the water permeability,the longitudinal and radial compliance,and the suture retention strength.In order to compare the different properties of the four samples,tests were also performed on the gelatin coated or sealed devices before and after gelatin removal.The results provided a useful comparison between the prototypes and the commercial control devices.The latter used ten times the amount of gelatin which had been applied as a coating in order to achieve the same low level of impermeability to water.The different amounts of gelatin also explained the different mechanical performance,such as compliance,for these prototype and control prostheses.     

蒿甲醚的纳米包装

为克服蒿甲醚水溶性差,体内代谢快,生物利用度低的缺点,将其进行纳米包装.利用初生态微晶法,选用生物相容性好,可降解的明胶作为壁材,制备出了蒿甲醚纳米胶囊.电镜结果表明：纳米胶囊为分散均匀的球形纳米粒子.纳米胶囊的制备增强了蒿甲醚的水溶性.一定程度上拓展蒿甲醚临床应用的范围.     

交联聚合物动态成胶及运移的室内模拟研究

室内采用长岩芯填砂装置模拟了交联聚合物注入、成胶封堵和运移过程。室内模拟结果表明,注入的调剖体系能够达到设计的封堵位置,在注入过程中体系受稀释、剪切和吸附等因素影响,其浓度和成胶前的初始黏度沿程呈下降趋势。在实验所用的浓度(0.2%HPAM)条件下,孔隙介质中的堵剂体系形成有效堵塞的时间显著延长,是静态条件下的6倍;从不同部位堵剂取样成胶后黏度和岩芯封堵前后注水压力变化情况看,有效封堵距离r小于设计封堵距离r′,0.67r′相似文献   

弹道模拟装置的理论与实验研究

报道近期研究的弹道模拟装置及相应的内弹道准两相流数学物理模型。对几种高能硝胺发射药进行了实验，给出了部分理论计算与实测的压力曲线。结果表明，该装置具有小巧、装填条件灵活、单发实验费用低等特点。理论模型及其计算软件可较准确地预估模拟装置内火药的动态燃烧。     

近程地地战术导弹的被动段制导技术

本文阐述了近程地地战术弹道导弹在现代战争中的重要作用,在说明被动段制导理由的基础上,介绍了被动段制导方法与发展前景,最后讨论了提高制导精度应采取的措施。     

超临界流体干燥法制备纳米级α-Fe2O3粉

以廉价的无机盐为原料，采用溶胶－凝胶法（Sol-Gel)结合超临界流体干燥（SCFD）技术制备纳米级Fe2O3粉，并通过XRD，TEM测试技术对所得样品进行分析。研究结果表明，采用该法，可制得分散性好的红色纳米级α-Fe2O3粉，且制备成本低，工艺简单。     

金属点接触中的量子化电导

用三维－一维－三维（３Ｄ－１Ｄ－３Ｄ）模型，研究了介观尺寸的弹道电子输运．利用单电子近似和模匹配技术求解三维自由电子气中的单电子薛定谔方程，得出了以２ｅ２／ｈ为单位的量子化电导．与２Ｄ－１Ｄ－２Ｄ模型体系中的结果不同，该模型体系出现了基于方位角简并的、以２×２ｅ２／ｈ为单位的电导量子化现象     

6自由度修正弹道脉冲推力仿真研究

建立了基于SIMULINK的六自由度弹道修正弹仿真模型，并在此基础上研究了脉冲推力作用下的弹道修正特性。针对非质心作用推力的情况，讨论了附加攻角振荡幅度、脉冲推力大小、作用时间间隔等因素对于修正距离的影响。根据讨论结果发现，修正弹在预设固定时间点附近存在有利触发脉冲时机。如果能够在预设时间点附近的一个短时间范围内选择有利触发时机，就可以大大减少修正弹附加攻角的振荡，从而接近达到脉冲推力作用于质心时的预期修正效果．