硅基1.55μm共振腔增强型探测器

报道了一种利用硅乳胶作为键合介质的新型键合技术.高反射率的SiO2/Si反射镜预先用PECVD系统生长在硅片上,然后键合到InGaAs有源区上,键合温度为350℃,无需特殊表面处理,反射镜的反射率可以高达99.9%以上,制作工艺简单,价格便宜.并获得硅基峰值响应波长为1.54μm,量子效率达22.6%的窄带响应,峰值半高宽为27nm.本方法有望用于工业生产.     

辐照药用淀粉的毒性研究

为确保人们食用的安全,对用~(60)Co-γ射线辐照5kGy的药用淀粉的毒性进行研究。通过90只Wistar大鼠的90天喂养试验及短期致突试验观察,证明辐照淀粉对大白鼠的生长、发育、食物利用率、血象、肝功能均无明显影响,亦未见骨髓嗜多染红细胞微核率、染色体畸变率及多倍体增加,证明无遗传毒性反应。Ames试验也说明辐照淀粉不诱发DNA中碱基对的置换型和移码型突变。病理改变及脏器系数的变化与对照组无显著性差异,未显示出对脏器的毒性作用。经上述实验证明食用辐照淀粉是安全的。     

激光熔覆镍基和钴基自熔合金的研究

本文采用镍基、钴基自熔合金通过激光熔覆获得性能优良的合金覆层,改善了叶片的耐磨性、耐蚀性,达到了提高使用寿命达10倍以上的目的。     

侧滑转弯反舰导弹末端机动的控制研究

反舰导弹进行末端机动,有利于增大突防概率.本文对反舰导弹的末端机动进行了分类,讨论了几种可能的控制实现方式的优缺点,给出了在几种控制指令下的末端机动实现公式,进行了具体的控制指令设计,并给出了一体化公式的一个例子.     

A neural network model for the free-ranging AGV route-planning problem

This paper describes the development of a prototype neural network model for the free-ranging AGV route-planning problem. The vehicle planner operates in quasi-real time. A small planning horizon is set and all transport requests existing at the beginning of a planning horizon are examined. A neural network model is proposed to perform dispatching and routing tasks for the AGVs. Its goal is to satisfy the transport requests in the shortest time and in a non-conflicting manner, subject to the global manufacturing objective of maximizing throughputs. Based on Kohonen's self-organizing feature maps, we develop three efficient planning algorithms for the single and multiple AGV problems. The simulation results indicate that the proposed neural network approach gives very efficient solutions.     

薄膜全耗尽SOI短沟道MOSFET准二维电流模型

本文在分析薄膜全耗尽SOI器件特殊物理效应的基础上,建立了可细致处理饱和区工作特性的准二维电流模型。该模型包括了场效应载流子迁移率、速度饱和以及短沟道效应等物理效应,可以描述薄膜全耗尽SOI器件所特有的膜厚效应、正背栅耦合(背栅效应)等对器件特性的影响,并且保证了电流、电导及其导数在饱和点的连续性。将模型模拟计算结果与二维器件数值模拟结果进行了对比,在整个工作区域(不考虑载流子碰撞离化的情况下)二者吻合得很好。     

介绍两项小革新

下面介绍的两项小革新,是我们在水厂的生产实践中,针对生产中的难点,经过长时间的摸索、试验得出的成果,并在生产中取得成效。1　硫酸铝投加系统改进我公司长期使用硫酸铝作混凝剂,硫酸铝的优点是对原水的适应性较好,运输方便,但使用中须先配制成溶液才能定量投加。在配制时,必须严格控制溶液浓度,因在浓度小于5%时,容易水解产生沉淀,堵塞计量器及输送管道。为了克服这一弊端,我们根据在输送管道中是否产生沉淀现象,逐步提高浓度。在试验中发现,当浓度提高到15%时,从溶液池到计量装置这一段没有发生沉淀堵塞通道的现象;但通过水射器之后在输…     

激光入射角对光声信号大小的影响

本文分析了高强度激光斜入射时等离子体共振吸收对光声信号的影响，导出了等离子体共振吸收最强时激光入射角的表达式，得出了激光斜入射时，随着激光入射角的增大，光声信号会出现一个极大值，并通过实验进行了验证。     

对新形势下毕业设计管理工作的思考与实践

分析了目前高校毕业设计的状况、毕业生求职应聘活动以及就业形势对毕业设计造成的影响，提出了改革毕业设计管理制度的一些做法及思路，介绍了有关毕业设计教学实践的初步体会。     

Agile manufacturing of a micro-embossed case by a two-step electromagnetic forming process

A very agile method, that relies solely on simple single-sided tooling, to form open-box-like enclosures with surface detail such as highly embossed surface features is demonstrated and analyzed. For example, this method may be used to fabricate personal electronics cases. The technique uses electromagnetic forces in a two-step process. In the first step a newly developed uniform pressure electromagnetic actuator is used to make a micro-embossed pre-form that can contain very fine surface detail in the part by micro-embossing features in the forming die. This blank is then trimmed. In the second major step electromagnetic flanging is used to give greater depth and steeper walls to the case. Both electromagnetic operations use one-sided tooling and very light equipment. In principle the tooling needed for this type of process can be put to use within days or hours of finalizing the component design and precise tooling tolerances or precise alignment are not required. This work shows the essential feasibility of this approach to manufacturing either small or large lots of components.