热声制冷机及其改进实验研究

热声制冷作为一种很有前途的制冷方法，在国内外相关领域引起了极大兴趣。热声制冷机由声发生器、共振管、板叠及高、低温换热器等部分组成。对声驱动器的振动膜及其冷却系统、气体弹簧系统、高、低温换热器进行了初步改进，使制冷机冷端温降从原来的12℃提高到27℃左右，这是目前国内报道的最大温降。     

基于径向矢量的不变性形状分类方法

介绍一种利用径向矢量提取形状特征的方法，着重于分析二维图形的不变性，提出一种带有方向因子的径向矢量描述，该矢量以图形边界弧长为自变量，完整地刻画了图形特点，克服了非凸图形识别中存在的多义性，以归一化的特征矢量的输入，采用三层神经网络为分类器，在字符及军事目标不变性识别中取得了令人满意的结果。     

±800kV直流输电线路重冰区导、地线脱冰冲击敏感因素浅析.

结合±800 k V直流输电线路重冰区的实际工程数据,基于脱冰数值计算理论,通过数值方法模拟了六分裂导线在不同档数、档距、高差等复合因素影响下导线的脱冰动力响应过程,分析不同参数条件下导线和地线脱冰对悬垂绝缘子串和耐张绝缘串的冲击效应,得到最不利脱冰冲击效应的控制因素。研究表明:不同档距和高差组合下,档距和高差均最大时脱冰后的冲击效应最强;对于连续档,不同档脱冰时,对其相邻档导地线串的冲击效应最大;脱冰水平冲击效应主要受水平档距的影响,垂直冲击效应主要受高差的影响。     

HIGH TEMPERATURE OXIDATION AND STRUCTURE OF SCALE AND WHISKERS FOR Fe-Ni-Cr SEALING ALLOYS

The oxidation rate,the growth,morphology and structure of oxide scale and whiskers forFe-Ni-Cr sealing alloys in H_2-H_2O atmosphere at high temperatures have been studied.The growth rate of scale is controlled by diffusion.The scale is composed of Cr_2O_3 andspinel(Fe,Mn)O·Cr_2O_3 and the oxide whisker,are spinel(Fe,Mn)O·Cr_2O_3.     

Electronic struture of titanium silicides

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Electrode–Ceramic Inter-Diffusion of Ba(Ti,Zr)O3-Based Y5V MLCCs with Ni Electrodes

The Ba(Ti,Zr)O₃-based multilayer ceramic capacitors (MLCCs) with Ni electrodes, which meet the Electronic Industry Association Y5V standard (from −30° to 85°C, at a temperature capacitance coefficient between −82% and 22%), have been studied in view of the electrode-ceramic inter-diffusion by several microstructual techniques (scanning electron microscopy/transmission electron microscopy/high-resolution transmission electron microscopy (HRTEM)) with an energy-dispersive X-ray spectrometer (EDS). The EDS analysis shows that the elements' inter-diffusion took place along the metal–dielectric interface and the migration of Ni toward the dielectric layers dominated this process. The incorporation of Ni did not transform the crystal structure but introduced lattice distortions, which were characterized by HRTEM, X-ray diffraction, and EDS. The degree of Ni diffusion in the sample with the thinner dielectric layer was more severe. It was concluded from the results that the Ni diffusion is related to the formation of oxygen vacancies after the annealing process, which should be a noticeable factor in the degradation behavior and reliability of base metal electrode MLCCs. The factors influencing the inter-diffusion are also discussed.     

海洋非黏结柔性管道接头密封结构分析

介绍海洋非黏结柔性管道接头的常见密封结构,用Abaqus对接头的密封特性进行数值分析,研究密封圈的密封性能对不同密封结构参数的灵敏度,得到密封结构参数变化对接头密封结构的密封性能和力学性能影响的一般规律.结果表明密封结构的主要设计参数为密封圈的锥角和曲率半径以及加载位移等.     

废蜜生产焦糖的工艺研究

介绍一种利用废蜜生产焦糖的新工艺。对影响焦糖色率的添加剂，熬制温度、时间等因素进行了研究。     

PTC型BaTiO3陶瓷的孪晶和孪晶界

用透射电镜和高分辨电镜观察研究了PTC型BaTiO_3陶瓷的孪晶和孪晶界结构,并提出了可能的{111}孪晶及孪晶界的原子结构模型。结果表明,{111}孪晶形成氧八面体共面的共格倾斜孪晶界,在孪晶界处可能存在一定量的A空位且原子密度要低于孪晶体内。同时还发现两种其它特征的孪晶现象。     

CS2 extraction and FTIR & GC/MS analysis of a Chinese brown coal

The abundance of low-rank coals in China, such as bituminous and brown coals, makes studies of their composition and structure of great significance to both coal chemistry research and for efficient utilization of the coal. We describe how a Chinese brown coal was ultrasonically extracted with carbon disulfide (CS2) and the raw and extracted coals were characterized by Fourier Transform Infrared Spectroscopy (FTIR). The corresponding extract was analyzed with a coupled gas chromatograph mass spectrometer (GC/MS). The FTIR analysis shows a great abundance of amidocyanogen, carbonyl, aromatic and hetero aromatic rings and single carbon-heteroatom bonds. This suggests the possible occurrence of compounds like alcohols, phenols, amines, esters, carboxylic acids, ethers, aromatics or heteroaromatics. The GC/MS analysis of the CS2 extract detected 62 compounds, among which the non-polar ones were of lower abundance while the polar ones were in higher abundance and were structurally diverse. This demonstrates the compositional and structural complexity of Shengli coal.