基于特征和知识的车身点焊智能CAPP方法研究

建立了车身零部件面向装配的特征模型,提出了装配过程中“特征演化”的概念,以简化零部件特征的定义;研究了点焊工艺知识结构,包括知识的总体结构、工艺事实和工艺条件表达,并面向知识匹配过程对知识结构进行了优化;分析了基于零部件特征和工艺知识的推理技术,包括规则匹配的算法、冲突消解的策略和产生式推理方法,采用线性模型和神经网络模型对工艺方法与工艺条件之间的映射关系进行了模拟。模拟结果表明,采用提出的方法能取得与实际相符的效果。     

生态农业大气环境检测评价分析

本文对生态农业大气环境检测对象、检测方法和检测仪器作了初步研究和探讨,并以杭州市为例,分析了杭州农业大气环境中的主要污染物以及相关检测标准,最后结合生态农业实际情况,对生态农业大气环境的评价因子、评价方法、评价标准作了初步研究分析,得出杭州市生态农业大气环境可用单项污染指数结合上海大气环境指数来评价.此外通过本课题的研究初步建立生态农业检测评价整个流程.     

陶瓷刀具硬车削GCr15钢的试验研究

通过改变GCr15钢硬态数控车削的切削用量,对切削力、加工表面质量的变化等进行了研究。结果表明:合理选择切削用量、采用陶瓷刀具高速硬车削GCr15钢可显著提高生产率及加工表面质量,并在一定程度上可取代磨削加工。     

薄膜式锰铜传感器——一种新型的超高压力传感器

文中综述了动态高压锰铜传感器最近十多年来的研究现状,着重介绍了一类新型的锰铜传感器———薄膜式锰铜传感器的研发进展。该类传感器的研制旨在提高传感器高压测试极限和缩短响应时间。目前已进行了直到80GPa以下的初步标定,响应时间最快达32ns     

The intrinsic thermal decomposition kinetics of SrCO3 by a nonisothermal technique

The kinetics of the decomposition of SrCO₃ in argon to SrO and CO₂ were studied in the temperature range 1000 to 1350 K. The thermal decomposition was followed simultaneously by thermogravimetric analysis (TGA) and differential thermal analysis (DTA) during linear heating. By using a nonisothermal method, the complete rate expression was determined from a relatively small number of experimental runs. Shallow beds of fine synthetic powder as well as thin flakes of pressed powder were employed to obtain the kinetics of decomposition in the absence of heat- and mass-transfer effects. The thermal decomposition started at about 1000 K. The recommended rate expression for the SrCO₃ decomposition is

CaC2-CaF2还原脱磷的实验研究

分析了不锈钢还脱磷的热力学条件，计算了脱磷率，并在真空感应炉中用CaC2-CaF2熔剂对2Cr13重熔钢液脱磷进行了实验研究。实验结果表明，这种渣有很强的脱氧和脱硫能力。当CaF2和CaC2的质量比接近1：4时，脱磷效果最好，最大脱磷率可达75．3％，并可使最终wp降至0．01％左右。     

Reduction kinetics of Fe<Subscript>2</Subscript>MoO<Subscript>4</Subscript> fine powder by hydrogen in a fluidized bed

Iron molybdate (Fe₂MoO₄) powders with an average particle size of 100 μm were reduced by hydrogen using a fluidized-bed batch reactor in the temperature range of 923 to 1173 K. The extent of the reaction was followed as a function of time by gas chromatography. The fluidizing-gas velocity was set at about 1.5 times the minimum fluidization velocity. The ratio of the height of the static bed to its diameter is about 1. Under the prevailing experimental conditions, it was found that the chemical reaction was the rate-controlling factor. The activation energy for this process was 158±17 kJ/mol. The crystal size of the Fe₂Mo powder produced at lower temperatures was in the nanometer range, indicating the possibility of mass production of alloys and intermetallics in the nanorange, using a fluidized bed.     

Development of an Analytical Technique to Determine the Fractions of Vanadium Cations with Different Valences in Slag

The current work aimed to develop a reliable method to analyze the amounts of different vanadium cations in metallurgical slag. The application of the technique to the samples of supercooled slag showed its applicability and reliability.     

攀钢4~#高炉配加冷固球团工业试验

攀钢4#高炉上配加2%冷固球团试验和冷固球团性能相关研究表明,高炉配加冷固球团取代块矿,高炉炉况稳定顺行,铁产量增加41 t/d,取得了良好的技术经济指标,对缓解块矿资源具有重要意义。     

Effects of Indium Doping on the Properties of Cd1-xMnxTe Crystals

通过近红外和红外透过谱表征,确定出掺铟后碲锰镉晶体透过率迅速下降,这是晶格吸收和自由载流子吸收共同作用的结果;而光致发光谱的分析结果表明,掺杂后施主-受主对峰增加,受主束缚激子峰减弱,且随着In含量的增加,受主束缚激子峰消失,只剩下施主-受主对峰。这一系列变化是因为替代的In原子作为施主补偿了Cd空位的缘故。拉曼光谱的测量显示,In掺杂导致"类CdTe"的纵向光学声子峰减弱;而磁学的测试结果则说明In的引入几乎不引起碲锰镉晶体磁化强度的变化。