乙烯裂解炉炉管失效原因分析

利用金相显微镜、X射线衍射仪、光谱分析仪等测试仪器,通过对炉管的材质、外观形貌、金相组织、组分组成等方面进行检测,分析了乙烯裂解炉炉管失效的原因.结果表明,材质为Incoloy 800 H合金的裂解炉管可满足乙烯裂解工况的工艺要求,炉管失效主要是由于高温过热引起的氧化腐蚀破坏所致,另外管内介质对腐蚀也有促进作用.     

聚酯厂钛复合钢板制氧化反应器的检验和鉴定

叙述了聚脂厂的氧化反应器在爆炸事故中由于高温高压对器壁复层（钛）造成的损伤和采取的相应修复措施及鉴定意见。     

组合式熔凝石英微透镜阵列-线列Yba_2Cu_3O_(7-δ)高温超导薄膜红外探测器的研究

采用准分子激光扫描消融法淀积YB32C23O7-δ高温超导薄膜,利用常规光刻工艺制备线列高温超导薄膜器件,采用离子束刻蚀制备与高温超导薄膜器件匹配的熔凝石英微透镜阵列,测试了微透镜／高温超导薄膜器件所构成的混合结构在1～5μm红外波段的几项重要的光响应特性．     

基于支持向量机的心律失常诊断研究

运用计算机技术辅助激光治疗心律失常疾病,通过非线性动力学分析心电信号,采用模式识别工具实现心律失常疾病的初步诊断。首先提出一种基于经验模式分解（EMD）的时间尺度滤波法,从而有效的抑制心电信号噪声。然后提取预处理后数据的排列熵（Permutatior Entropy,PE）特征值。最后利用支持向量机（SVM）分类器验证特征值的分类。实验结果表明该算法能有效的实现正常和异常心电信号的自动分类,从而简便快速的初步诊断心律失常疾病。     

Euro PM2007 congress and exhibition

Abstract

Threatened with bureaucratic over-regulation under the EU's newly enacted REACH legislation, and other competitive challenges, the large tonnage section of the European PM industry did not seem to be facing a rosy future as it met in the Ville Rose city of Toulouse. Nevertheless, the EPMA was seen as having a key role in moving the industry forward and resisting the pressures from the large end users, low cost (Asian) producers, and competing technologies. Europe still leads the world in the manufacture of hard materials, but China is expected to overtake Europe in tungsten carbide and diamond tools production within the next 3–5 years. European sales of metal injection moulded parts continue to grow strongly, doubling in value to E140 million between 1997 and 2003. PM research in Europe is very active, with 40 universities and institutes and over 500 researchers involved. These provided the large majority of the European presentations at PM2007.     

用双参数模型估算复合氧化物的标准熵

 提出了估算二元复合氧化物标准熵的双参数模型。用此模型可估算由CaO、SiO2、TiO2等38个简单氧化物之间形成的二元复合氧化物的标准熵,其涉及到硅酸盐、铝酸盐、钛酸盐、硼酸盐、磷酸盐、碳酸盐、硝酸盐、硫酸盐、亚硫酸盐、铁酸盐、铬酸盐、钒酸盐、钨酸盐、钼酸盐、锆酸盐、亚硒酸盐、铪酸盐、铀酸盐等多个体系。在估算已知的251个二元复合氧化物标准熵时,平均误差为435 J·mol-1·K-1,标准差为555 J·mol-1·K-1。用此双参数模型还可估算三元复合氧化物的标准熵,在估算已知的19个三元复合氧化物标准熵时,其平均误差为713 J·mol-1·K-1,标准差为1012 J·mol-1·K-1。     

The thermochemical behavior of some binary shape memory alloys by high temperature direct synthesis calorimetry

The standard enthalpies of formation of some shape memory alloys have been measured by high temperature direct synthesis calorimetry at 1373 K. The following results (in kJ/mol of atoms) are reported: CoCr (−0.3 ± 2.9); CuMn (−3.7 ± 3.2); Cu₃Sn (−10.4 ± 3.1); Fe₂Tb (−5.5 ± 2.4); Fe₂Dy (−1.6 ± 2.9); Fe₁₇Tb₂ (−2.1 ± 3.1); Fe₁₇Dy₂ (−5.3 ± 1.7); FePd₃ (−16.0 ± 2.7); FePt (−23.0 ± 1.9); FePt₃ (−20.7 ± 2.3); NiMn (−24.9 ± 2.6); TiNi (−32.7 ± 1.0); TiPd (−60.3 ± 2.5). The results are compared with some earlier experimental values obtained by calorimetry and by EMF technique. They are also compared with predicted values on the basis of the semi empirical model of Miedema and co-workers and with ab initio calculations when available. We will also assess the available information regarding the structures of these alloys.     

Martensitic transformation of Ti50Ni30Cu20 alloy prepared by powder metallurgy

Phase transformation behavior of Ti50Ni30Cu20 shape memory alloys prepared by powder metallurgy is analyzed with respect to the duration of mechanical alloying. The processed blends were studied by differential scanning calorimetry and room temperature X-ray diffraction. The martensitic transformations evidenced by thermal scans are discussed in correlation with the relative phase content obtained from the refinement of the X-ray diffraction patterns.     

Experimental investigation and thermodynamic calculation of the phase equilibria in the Co-Nb-Ta ternary system

The isothermal sections of the Co-Nb-Ta ternary system at 900 °C, 1000 °C, 1100 °C, 1200 °C, 1300 °C have been experimentally determined by electron probe microanalysis (EPMA) and X-ray diffraction (XRD) techniques on the equilibrated alloys. On the basis of the experimental data investigated in the present work, the phase equilibria in the Co-Nb-Ta system has been thermodynamically assessed by using CALPHAD (CALculation of PHAse Diagrams) method, and a consistent set of the thermodynamic parameters leading to reasonable agreement between the calculated results and experimental data was obtained.