坚持改革创新,开创电子实习新局面

电子工艺实习如何适应信息时代技术发展的要求？如何满足新时代人才需求？如何改变电子实习就是电烙铁加螺丝刀的旧面孔？本文介绍了电子工艺实习教学改革中引入高新技术，正确处理基础与提高、设计与制造、教学与研发等关系的实践与体会，重点介绍了在电子工艺实习中进行表面贴装技术、EDA实践方面的最新教学改革成果，提出了实习教学发展的新设想，为电子工艺实习的进一步发展作了有益的探索。     

结构素描教学与学生智力开发

结构素描,是素描表现形式中的一种表现方法,其特征是以研究和表现形体的结构为宗旨,依靠透视的原理,尽可能地排除或减少明暗、肌理等表面因素,以简练的结构线条,表现出物体的穿插及构成关系,来达到形体自身结构的纯粹实体效果.     

Regression-Based Artificial Neural Network Methodology In Response Surface Methodology

Response surface methodology (RSM) is an important tool for process parameter optimization, robust design and other quality improvement efforts. When the relationship between influential input variables and output response is very complex, it‘ s hard to find the real response surface using RSM. In recent years artificial neural network (ANN) has been used in RSM. But the classical ANN does not work well under the constraints of real applications. An algorithm of regression-based ANN(R-ANN) is proposed in this paper, which is a supplement to the classical ANN methodology. It makes network closer to the response surface, so that training time is reduced and robustness is strengthened. The procedure of improving ANN by regressions is described and the comparisons among R-ANN, RSM and classical ANN are computed graphically in three examples. Our research shows that the R-ANN methodology is a good supplement to the RSM and classical ANN methodology, which can yield lower standard error of prediction under conditions that the scope of experiment is rigidly restricted.     

环氧乙烷的生产现状及其应用

本文就我国环氧乙烷的生产现状及其应用作一介绍。在此基础上,对茂名地区环氧乙烷衍生物产品的开发提出一些建议。     

衬底表面预处理增强金刚石薄膜成核的研究进展

近年来与金刚石成核有关的技术研究取得了较大的进展。本综述了衬底表面的预处理对增强利用化学气机沉积生长金刚石薄膜成核的作用，并进行了分析和讨论。     

简单易行的静电屏蔽实验

实验器材 感应起电机一台，验电羽两个，金属网罩一个，导线三根． 实验方法将一个验电羽放在金属网罩中间，另一个验电羽放在金属网罩外面，用导线将验电羽和金属网罩连接，金属网罩与感应起电机连接．转动感应起电机使金属网罩带电，此时可以看到金属网罩外面的验电羽散开，而金属网罩里面的验电羽完全没有反应．该现象说明电荷只分布在金属网罩的外表面，内表面不带电，金属网罩起到了屏蔽作用．     

混合表面活性剂体系中丰富形貌的介孔氧化硅合成探究

在非离子表面活性剂F127(EO_(106)PO_(70)EO_(106))和阳离子表面活性剂CTAB复配体系中,通过酸性介质中正硅酸乙酯(TEOS)的水解,得到了形貌均一、孔道规则的介孔氧化硅。通过对反应物F127、CTAB、HCl和TEOS浓度效应和温度效应的单因素探究,发现反应物浓度和温度的改变对产物的形貌都有很大的影响,只有在一个很窄的浓度区间且室温条件下才可以得到形貌规整的螺旋结构。在该混合表面活性剂复配体系中,CTAB起到了致孔剂的作用;而F127则起到了调控产物形貌的作用,且F127的浓度需要控制在临界胶束浓度以下一个合适的浓度范围内。对非离子型表面活性剂和阳离子型表面活性剂(两者均为非手性试剂)复配体系中得到了螺旋状介孔SiO_2的反应机理进行了探讨。     

Modeling of contact surface morphology and dust particles by using finite element method

The effect of dust particles on electric contacts and a hazardous size range of hard dust particles using a rigid model were discussed before. As further research, elastic-plastic model of finite element analysis was established in this work, which is closer to real condition. In this work, the behavior of large size and small size particles, and the influence of particles hardness were investigated. The calculating result of small-size particles presents a general hazardous size coefficient for different contact surface morphology; for large-size particles, it presents a hazardous size coefficient for complicated composition of the dust. And the effect of the dust shape is also discussed.     

多轴载荷作用下表面裂纹的疲劳扩展

通过对圆柱体直前缘表面裂纹在循环拉伸与循环扭转载荷共同作用下的扩展规律进行实验研究,分析了不同载荷曲线相位差、以及拉扭应力幅度对表面裂纹扩展路径、疲劳寿命和裂纹扩展速率的影响。结果表明:不同的相位差对裂纹扩展行为有着非常重要的影响。初始阶段的裂纹扩展主要受到剪应力幅度的影响,后继扩展则依赖于轴向应力幅度。拉应力和剪应力的增加均会增加裂纹扩展速率,但轴向应力幅度变化的影响大于剪切应力幅度。     

非离子表面活性剂在纳米药物制备中的应用

章介绍了非离子表面活性剂在纳米粒、脂质体、脂肪乳等纳米药物制备中的应用，概述其应用原理和最新进展，对于开发研制纳米药物新剂型、新品种具有指导意义。