无人机发展应用及反无手段研究

近年来无人机及蜂群作战方式如火如荼,如何对抗无人机也成为近程防空重点.本文对无人机特点及分类,无人机作战方式及发展进行研究,深入分析了反无体系构成和手段,最后就反无系统中雷达的发展方向和任务提出建议.     

市售商品补钙制剂的补钙效果观察

本文以大鼠为模型，研究不同化学形式钙以及市售数种钙剂的补钙效果。１．不同化学形式钙的补钙效果：选用三周龄断乳Ｗｉｓｔａｒ大鼠５６只，雌雄各半，喂饲３周缺钙饲料后，按体重随机把大鼠分成４组，即缺钙饲料、补充碳酸钙、活性钙或乳酸钙饲料（３０００ｍｇＣａ／ｋｇ），实验期为１２周。２．市售补钙制剂的补钙效果：选用动物及实验期同实验１，动物数为８４只，按体重随机把大鼠分成７组，即缺钙饲料组，其它６组为补充碳酸钙、钙尔奇－Ｄ、盖天力、活性钙、壮骨宝、巨人补钙饲料（３０００ｍｇＣａ／ｋｇ）。补钙各组大鼠终体重和身长均非常显著高于对照组。补充不同化学形式钙或商品钙制剂组的血浆、红细胞和肝脏中钙含量均显著高于缺钙对照组，补钙各组间无显著差异。多数钙制剂对雄性肾脏钙存留的影响不显著，只有盖天力显著增加雄性肾脏钙存留；补钙对雌性肾脏钙存留的影响非常显著。补充的三种化学形式钙和商品钙剂均显著增加骨矿物质含量，但是碳酸钙和乳酸钙的效果优于活性钙，巨人补钙和活性钙的效果似不如其它钙制剂。按效果价格比，目前碳酸钙仍是最好的钙源。     

无人水下航行器发展与应用

无人水下航行器作为无人运载平台的一个重要分支,在民用领域和军用领域都发挥着极其重要的作用。首先介绍了几个发达国家UUV的发展现状及其未来发展计划,强调了UUV的应用领域,如海洋探测与开发、水雷对抗、潜艇对抗等等,在此基础上分析了UUV发展必须突破的几项关键技术,如能源问题、自主导航、协同使用等等。     

基于最小二乘法标定寻北仪基座倾角测量系统的测量当量

为得到准确的基座倾斜量,提出一种基于最小二乘法标定寻北仪基座倾角测量系统的测量当量方法。阐述基于电解质型倾角传感器的寻北仪基座倾角测量系统的工作原理,对基座倾斜的大小和方向进行准确测量,利用基座倾斜与寻北精度影响量之间的数学模型,进行误差补偿,根据最小二乘法建立数据模型,进行数据拟合,当标定的当量与理论设计值相差较大时,可调整电路放大倍数,进行重新标定;当测量当量调整到与设计值基本一致,将最后测量当量标定值记录下来,写入单片机相应flash单元即可。结果表明:该测量方法可以快速简洁地确定测量当量,保证寻北精度。     

300 mm直径硅外延片均匀性控制方法

随着摩尔定律的逐步实现,大直径硅片的应用规模逐渐扩大,然而,大直径硅外延片的片内均匀性成为了外延的主要问题之一.使用具有五路进气结构的单片外延炉生长300 mm直径硅外延片.相对于传统的三路进气结构,五路进气可以分别对硅片表面的5个区域的气流进行调节,实现单独分区调控,从而提升了外延层厚度均匀性的可调性.实验中,采用两步外延方法,进一步提升了片内电阻率均匀性.通过对工艺参数进行优化,300 mm硅外延片的外延层厚度不均匀性达到0.8％,电阻率不均匀性为1.62％(边缘排除5 mm),成功提升了300 mm直径硅外延片的外延层厚度和电阻率均匀性控制水平.     

Regulation and Reconstruction of Cell Phenotype Gradients Along the Tendon-Bone Interface

Tendon–bone interface is prevalent in the human body. It is divided into four zones: tendon (soft tissue), unmineralized fibrocartilage, mineralized fibrocartilage, and bone (hard tissue). Tendon–bone interface is characterized by a cell phenotype gradient that appears in the different zones. The cell phenotype gradients at the tendon–bone interface are orchestrated by specific intracellular molecular mechanisms, extracellular factors, immune signals, and neurovascular factors. These features have inspired scientists to design systems that mimic natural cell phenotype gradients. These biomimetic systems include the construction of cell sheets, regulation of cellular microenvironments, and the design of gradient functional scaffolds. Exploration of methods to mimic cell phenotype gradients is instructional for future clinical applications in reconstituting the tendon–bone interface. The present review elucidates the gradient composition of the tendon–bone interface. The associated regulatory mechanisms and applications are discussed, with the anticipation of creating a mise en scène for future research in interface tissue engineering.     

Site‐Selectively Coated,Densely‐Packed Microprojection Array Patches for Targeted Delivery of Vaccines to Skin

Densely packed dry‐coated microprojections are shown to deliver vaccines to targeted locations within the skin that are rich in immune cells, thus inducing protective immune responses against a lethal virus challenge. Selectively limiting the antigen coating to the tips of the projections, which penetrate the skin, would significantly reduce the amount of vaccine required in immunization. In this paper a simple technique, dip‐coating the microprojections, is introduced to meet this goal. By increasing the coating solution viscosity, an otherwise strong capillary action is mitigated and the desired controlled coating length on projections is achieved. Following application to the skin, most of the coated vaccine material is rapidly released from the projections (82.6% in mass within 2 min) to the target locations within the skin strata and a potent immune response is induced when a conventional influenza vaccine (Fluvax) is tested in a mouse model. The utility of this coating approach to a variety of molecules representative of vaccines (e.g., chicken egg ovalbumin (OVA) protein, DNA, and fluorescent dyes) is demonstrated. These collective attributes, together with the simplicity of the approach, position the dip‐coating method for practical utility in large vaccination campaigns.     

探索电工电子课程多元化的过程性考核方式

考试是高校实现人才培养目标的落脚点,探索基于实践项目制作、基于信息化手段、基于非标考题等多元化的过程性考核方式改革,加大过程性考核的分值比重,增加过程性考核方式的趣味性和创新性,优化电类课程考核模式,进而达到全面提升电工电子课程的高阶性、创新性和挑战度的终极目标。