GPIB激光自动测径系统及逻辑分析仪的应用

激光测径仪可以对被测的直径进行精确地测量，但被测物所处的环境条件如灰尘、蒸汽等都会影响测量的精确性。本文介绍了一种基于GHB接口的激光测径自动测试系统，用于采集激光测径仪在各种干扰条件下的测量信号，并利用计算机对获得的数据进行处理，从而消除环境对测量结果精确性的影响，另外重点介绍了系统中逻辑分析仪的使用。     

Air oxidation behavior of nitrogen ion implanted zircaloy-4 at 500 °C

Journal of Materials Science -     

Bridgman growth of bismuth tellurite crystals

The photorefractive crystal, Bi₂TeO₅, was grown by the modified Bridgman method for the first time. High purity Bi₂O₃ and TeO₂ were used as starting materials and were mixed thoroughly with molar ratio of Bi₂O₃/TeO₂ = 1 ∶ 1. Platinum crucible was fabricated with a seed well of 10 mm in diameter and several folds were pressed so that the spontaneous nuclei could be eliminated through competition. The crucible was sealed during the growth so that the evaporation of TeO₂ was controlled effectively. By optimizing growth parameters, transparent and crack-free Bi₂TeO₅ crystal up to 25 mm in diameter and 40 mm in length was grown successfully.     

One-step and rapid synthesis of high quality alloyed quantum dots (CdSe-CdS) in aqueous phase by microwave irradiation with controllable temperature

In this paper, we presented a seed-mediated approach for rapid synthesis of high quality alloyed quantum dots (CdSe-CdS) in aqueous phase by microwave irradiation with controllable temperature in 1 h. In the synthesis, CdSe seeds were first formed by the reaction of NaHSe and Cd²⁺, and then alloyed quantum dots (CdSe-CdS) were rapidly produced by releasing of sulfide ions from 3-mercaptopropionic acid as sulfide source with microwave irradiation. The alloyed quantum dots synthesized had good optical properties, the quantum yield was up to 25%, and the full width at half maximum of the emission spectrum peak was about 28 nm. The as-prepared alloyed CdSe-CdS QDs were characterized by XRD, XPS and ICP-AES in order to explore the structure and component of the alloyed nanocrystals and the reaction mechanism. We speculate that the alloyed CdSe-CdS quantum dots may exist a gradient internal structure according to our preliminary results.     

磁调制器的建模与仿真研究

基于MATLAB软件中的SIMULINK仿真环境建立了磁调制器的仿真模型,它可以精确模拟坡莫合金磁化曲线的饱和段,有效克服传统作图法的不足,能够快速分析包括激励线圈、直流偏磁线圈、检测线圈等的内阻在内的各种参数对调制性能的影响,有利于了解磁调制器工作机理,对于快速设计具有合理特性的磁调制器有指导意义。     

在艺术设计学科中的素描问题新探

纯美术教育和艺术设计教育分属不同的教育体系，而目前艺术设计教育中有许多直接从纯美术承接的结构内容，这或许会影响艺术设计教育的良性发展。作为基础课程的传统的素描教学不能适应艺术设计的培养目标，如何调整教学目标和教学方式的问题突显出来。参照艺术设计的三大构成基础进行改革，将是一种有效的方式。     

高新技术产业化的风险分析与防范对策

高新技术产业化过程中的风险因素严重影响了高新技术产业化的顺利实施．通过分析高新技术产业化的基本特征和风险的主要类型及其成因，提出了防范风险的对策。     

基于"终端开口波导法"相对介电常数的CAT

针对电介质介电常数的传统测量方法对试样形状要求严格和对有生命物质不易实现等方面的弊端 ,本文研究了终端开口波导法确定电介质相对介电常数εr 的测量原理和方法 ,给出了计算εr 的拟合解 ,并在自行设计的微波CAT (ComputerAidedTest)系统上实现了自动测量 .实验结果表明 ,该方法原理清晰、测试简捷、精度较高 ,尤其适合对有生命物质相对介电常数的测量     

锆合金的碘致应力腐蚀开裂研究(英文)

研究了不同热处理状态的Zr-2和Zr-4合金在不同浓度的碘介质及实验温度下的应力腐蚀开裂(SCC)行为。并对不同织构取向的试样在350℃下进行了蠕变实验,蠕变实验的载荷值选择与SCC实验相对应的一系列典型载荷。用扫描电子显微镜观察了断口特征,用透射电子显微镜和光学显微镜检查了材料的显微组织,用X-光衍射仪测定了锆合金的织构,分析讨论了材料状态、实验温度、碘浓度以及蠕变对锆合金碘致应力腐蚀行为的影响。     

焚烧炉烟气中铅、锌、苯并(a)芘的测定

建立了用电感耦合等离子体光谱法(ICP-AES)和高效液相色谱法(HPLC)分别测定焚烧炉烟气中铅(Pb)、锌(Zn)和苯并(a)芘(BaP)的分析方法。研究了烟尘及玻璃纤维滤筒的预处理，测定Pb、Zn、BaP时基体的干扰与消除，并给出Pb、Zn的干扰校正系数。实验测得Pb、Zn和BaP的回收率超过84％，相对标准偏差Pb为3．51％，Zn为7．28%，BaP为4．30％。实验结果表明，该分析方法可以满足焚烧炉运行中的监测需要．