试样长度对 13CrMo44钢管力学性能的影响

研究了试样长度对13CrMo44珠光体耐热钢管力学性能的影响，研究结果表明，随着L0升高，该钢管的伸长率下降并满足δ=16.9% 68.2%√F/L0关系，L0较短时，其对钢管的抗拉强度（σb)和屈服强度（σs)没有什么影响；L0较长时，钢管的σb和σs都稍有下降，解释了产生上述现象的原因。     

DSS2205轧制与爆炸复合板复层组织与性能分析

采用实验室化学浸泡、电化学腐蚀试验及维氏硬度测量技术研究了DSS2205爆炸及热轧复合板复层性能,利用金相显微镜、透射电镜分析了复层组织,并与复合前的DSS2205进行了对比分析.结果表明:相比复合前的DSS2205不锈钢,轧制和爆炸复合板复层腐蚀性能略有下降,硬度增加,但轧制复合板复层腐蚀性能优于爆炸复合板复层;轧制...     

Separation of cadmium and nickel from waste Ni—Cd batteries

To separate the cadmium and nickel resources in waste Ni-Cd batteries,a self-designed vacuum distillation recycling system was studied under laboratory conditions.The effects of system temperature,operating pressure,and time on the separation of Ni and Cd were studied respectively.The mechanism of vacuum thermal recycling was also discussed.Results show that vacuum distillation is a very effective separation method for waste Ni-Cd batteries.At a Constant pressure,the increase of temperature can improve the separating efficiency of Cd.When the temperature is 1173K,Cadmium can evaporate completely from the samples during 3h at 10Pa,The reduction of pressure in a certain range is effective to the separating of Cd from Ni-Cd batteries by vacuum distillation.     

枧田瓷石化学与矿物组成及其工艺性能研究

本文研究了枧田瓷石的化学与矿物组成及其工艺性能。利用XRF、XRD和FT—IR测试手段确定了瓷石的化学与矿物组成,结果表明：枧田瓷石由石英、高岭土、白云母和钠长石组成,其含量分别为56wt％、24wt％、13wt％和7wt％。采用DTA—TG和XRD分析瓷石的热分解过程,结果发现,白云母和高岭土发生了热分解,石英出现了晶型转变。1300℃煅烧后只存在石英和莫来石晶相,并且工艺实验表明其白度高达51,烧成收缩为4．9％,吸水率为0．14％,显气孔率为0.18％。     

V型滤池常用滤砂在给水处理中各参数的对比试验

文章通过对V型滤池常用的6种粒径滤砂进行过滤效果的对比试验研究,确定一种适合处理我国南方地区水质的均质滤料,使滤后水浊度达到小于0.1 NTU的处理效果。经过对不同滤砂的进出水浊度、水头损失以及过滤周期的一系列对比试验,6种滤料中粒径为1.0 mm的滤砂处理效果最好,达到所要求的处理效果。     

Comparison of the fixation of heavy metals in raw material, clinker and mortar using a BCR sequential extraction procedure and NEN7341 test

The release potential and leaching behavior of five heavy metals (As, Cd, Cr, Cu and Pb) in raw material, clinker and mortar were studied by the three-step sequential extraction procedure proposed by the commission of the European Communities Bureau of Reference (BCR) and NEN7341 leaching test. The results of two experimental methods were compared to show the fixation difference of heavy metals among three kinds of samples. The results of NEN7341 leaching test show that the maximum leached concentration of cement products is low and the leached fraction of five heavy metals represents less than 15% of the total heavy metal content of the cement product. To refer to the bulk content as a criterion of environmental impact is not appropriate. The results of sequential extraction procedures show that the bonding forms of heavy metals change a lot in three samples. The contamination factor (Cf) and the leached fraction of each element in three samples indicate that all the elements are better fixed in cement products than in raw material due to calcination and hydration. To most elements, the relative metal retention is higher in mortar than in clinker. Compared within the five analyzed elements, Cd is better retained and Cu is worse retained in the same kind of sample.     

短周期螺柱焊在线分析系统

短周期电弧螺柱焊生产效率高,易于实现自动化,广泛应用于汽车工业。开发了由信号采集单元和分析软件构成的短周期螺柱焊在线分析系统。信号采集单元包含PIC18F4580单片机、电源、信号调理、外部存储器和RS485通信等电路,通过焊接状态判断、AD采样、数据存储和通信等程序,实现焊接电流和电压采集、存储和传输。分析软件采用Microsoft Visual Studio C#编写,操作界面由主窗口、焊接过程分析窗口、熔深阈值设置窗口和报警窗口等构成。DP600镀锌钢板焊接试验表明,开发的短周期螺柱焊分析系统能实时显示焊接电流和电压波形,提取焊接参数特征值,判断电弧的稳定性,熔深计算值与实测值相吻合,在线检测结论与外观目检、宏观检测和扭矩测试的结论一致。系统收集的原始数据可用于分析引起质量问题的具体原因。     

超声波探伤仪的线性误差测试方法分析

介绍了超声波探伤仪的工作原理,得出水平线性和垂直线性对缺陷定位和定量的影响.对超声检定装置(含脉冲信号发生器和标准衰减器)和参考试块这两种测量器具进行探讨,同时用两种测试方法分别进行试验,得出这两种测试结果的优劣,分析影响因素,并给出相应的使用建议.     

海洋平台管道自动焊接工艺研究

针对海洋平台运维工程管线厚壁管道对接接头的机器人自动焊接生产线要求,分别采用K-TIG、高频TIG焊及直流TIG焊等打底焊工艺,以及混氩保护气体条件下的脉冲MAG填充盖面焊工艺,对生产线的焊接工艺进行了工艺适应性研究,并按照美标ASME BPVC相关要求对焊接试验中的焊件进行了焊缝力学性能和X射线探伤,制定出一套可用于实际焊接生产焊接生产工艺参数,为管线管道的自动化焊接生产奠定了工艺基础。     

基于背景和前景交互传播的图像显著性检测

为了更精确地提取图像中的显著性区域,提出一种新的基于背景和前景交互传播的图像显著性检测计算模型。通过建立一个新的模型来寻找图像中的显著性元素,用一种交互式特征传播方法来扩散显著性特征。采用不同参数对图像进行分割,得到多个尺度下的超像素;在单一尺度下通过背景和前景交互传播获得超像素的显著值;对多个显著值进行加权平均融合,并采用平滑机制进行优化得到最终显著图。在公开图像数据库进行的试验结果表明,该模型提高了对图像显著目标大小的适应性,不仅较好地抑制了噪声,还使得显著目标更均匀地凸显出来,结果优于同类的算法。