高职机电一体化专业教学模式研究与实践

一、岗位需求概况近年来对本校机电一体化专业02-05年毕业生作了跟踪调查。调查涉及国有企业、外资企业、合资企业、股份制企业、民营企业及事业单位共86家。调查采取问卷、走访、座谈、电话、传真、信函、电子邮件等咨询方式。调查主要包括毕业生上岗速度、岗位表现、专业技能     

三峡地区导线覆冰的特性及雾凇覆冰模型

根据对鄂西及川东地区输电线路因导线覆冰引起事故的调查结果,分析了三峡地区输电线路导线覆冰的基本特征,并从理论上建立了导线的雾凇覆冰模型。     

The effects of microfilament and microtubule inhibitors and periodic electrical impulses on phloem transport in pea seedling

In phloem transport, whether protoplasmic activity participates in assisting sap flow in sieve element-companion cell complcx hils long been in debate. The prcsent investigation assumcd microfilament (MF) and microtubule (MT), the two constituents of the protoplasmic cytoskeleton, as motive force, and employed germinating pea seedling suspended in moist chamber as experinental material: thc seed being the source; the elongating root, the sink.¹⁴C-labeled sucrose was added to the seed as indicator. The amount of sap transported from source to sink was measured by the increase in root elongation. The transport phloem was within the cylinder of the peclcd root in thc middle. The exposed cylinder was treated with MF inhibitor (cytochalasin B), or microtubule inhibitor (amiphosmethyl). Results showed that the sap influx into the elongating root. and the¹⁴C activity as well, was reduced by abut one half in treatrrrent with cytochaliisin B, and much less by amiphos-methyl treatment. Similar effect was shown in clcctrical impulse Ireatnimt, which scems to disrupt the MF and MT configuration.     

I-V andC-V properties of TiO2 thin film by pulsed-laser reactive deposition

TiO-2 thin films have bee deposited on p-Si(111) substrates by pulsed-laser ablation of metallic Ti target in the O-3 ambient. The current-voltage and capacitance-voltage of the Al/TiO-2/Si capacitors are measured. The results show that the dielectric constant of thin film after being annealed at 700℃ is found to be 46, and the border trap density and the interface state density at the TiO-2/p-Si interface are 1.8×10 12 cm -2 and 2×10 12 eV -1·cm -2, respectively. The conduction mechanisms of as-deposited films are also discussed.     

温敏二极管性能的优化研究

从优化设计的需要出发,推导了温敏二极管灵敏度、线性度和串联电阻等电参数的理论公式．采用优化分析法,讨论了影响温敏二极管性能诸多因素的矛盾关系,提出温敏二极管的设计原则及解决相关矛盾的方法．理论分析得到实验结果的有力支持．     

一种用于电容式PT系统的微小电容量检测方法

针对大型工业过程设备（如大型反应器,大型容器及大型分离器）使用电容式ＰＴ技术中存在的微小电容量检测问题,提出了使用高压交流单边激励与磁性Ｃ／Ｖ转换相结合的方法进行测量,该法具有较强的抗杂散电容的能力,实验表明,该法的电容测量分辨率可达０．１ｆＦ数量级。     

石墨嵌入化合物的合成及其性能

概述了石墨嵌入化合物的各种制备方法及各自的物理、化学特性,结合该化合物独特的性能,指出了它们的应用前景及将来研究应着重解决的问题。     

四轴线切割编译程序数据结构的建立

通过对四轴线切割常用柱面、锥面及异形面的加工分析,给出了统一处理的编译程序数据结构。     

单井电阻加热采油技术研究

根据电磁场理论、能量守恒原理和两相流原理,给出了单井电阻加热油藏的数学模型。利用数学模拟方法研究了油藏电导率和油层厚度对电热效率的影响以及电阻加热油藏中的温度分布问题,讨论了输入电功率对原油采收率的影响。数值计算结果表明,输入电功率越高,原油采收率增加的幅度越大,随着无因次油藏电导率的减小,电热效率提高,有效加热半径也增大。在电阻加热油藏工艺中应防止电极处出现温度过高的现象     

微晶CuCr材料的制备及电击穿性能的研究

根据真空断路器大功率、小型化发展趋势对触头材料的要求，探索用高能球磨制粉、热压烧结的方法制备微晶ＣｕＣｒ触头材料．结果表明，高能球磨能够制备出超细晶Ｃｕ－Ｃｒ合金粉．７５０℃热压时材料仍保持合金粉形貌，颗粒内发生部分过饱和固溶Ｃｕ与Ｃｒ的时效析出过程．９２０℃热压时Ｃｕ与Ｃｒ组元重新分布并发生了再结晶过程，晶粒尺寸为２～３μｍ，远远小于常规方法生产的ＣｕＣｒ材料．由于微晶ＣｕＣｒ材料中Ｃｒ相固溶度升高，使材料电击穿机制发生变化，首次击穿相从常规材料中的Ｃｒ相转移到Ｃｕ相上．