High Efficiency Electrochemiluminescence for Copper(II) and Cadmium(II) Pyrazolate Polymers

Journal of Inorganic and Organometallic Polymers and Materials - Two new coordination polymers, namely, [Cu2(L)2(4,4′-bpy)]n (1) and [Cd(HL)Cl(1,10′-phen)]n (2)...     

氟硅酸钾滴定法测定粗制氟化钠中二氧化硅

采用硝酸-氢氟酸混合酸为消解溶剂,通过微波消解技术对粗制氟化钠进行快速消解,并用氟硅酸钾滴定法测定其二氧化硅含量。选择饱和氯化钾溶液替代固体氯化钾作为沉淀剂,考察了消解酸体系、饱和氯化钾溶液用量、沉淀温度、沉淀放置时间、共存元素干扰及指示剂选择等条件对测定结果的影响并进行优化。确定了最优测试条件：以8 mL硝酸+2 mL氢氟酸为消解溶剂,以8 mL饱和氯化钾溶液为沉淀剂,控制沉淀温度为20~25 ℃、沉淀放置时间为15 min,选择50 g/L氯化钾-50%乙醇溶液洗涤沉淀,采用溴麝香草酚蓝-酚红指示剂。该方法应用于回收粗制氟化钠中二氧化硅含量的测定可大幅度缩短分解试样的时间,有效降低检测成本,回收率为99.15%~100.63%,相对标准偏差（RSD,n=8）小于1%,与传统高温碱熔法测定结果相符,方法的准确度和精密度较好。     

AutoCAD系统中实现电子图档模糊查寻的方法

本文讨论了在AutoCAD2000系统中通过图纸标题栏和明细表的少数信息模糊查寻电子图档文件的方法及VBA编程思路，介绍了图档标题栏和明细表数据库的结构，给出了标题栏和明细表信息与图档的路径及文件名之间的查寻关系。     

Characterization of ultrafine La x Sr1−x MnO3 powder prepared by spray pyrolysis

The characterization of La _x Sr_1−x MnO₃ powders produced by spray pyrolysis using scanning electron microscopy (SEM) and transmission electron microscopy (TEM) observation, specific surface area (Brunauer-Emett-Teller), and particle size distribution measurements shows that the resultant large particles are loose agglomerates consisting of many small particles. However, the sintered tiny particles can form hard agglomerates, and the particle size increases remarkably. The structures of the powders before and after sintering were identified by x-ray diffraction (XRD). The study of the electrical property of the powder shows that the powder is a metallic conductor. In a reducing atmosphere, the powder can be decomposed. When the powder is cofired with yttria-stabilized zirconia 5% (YSZ) powder at 1200 °C for 5 h, no new phase is produced, and the powder remains a single provskite hexagonal-rhombohedral structure.     

皮江法炼镁工艺在清洁生产上的进展

1941年，皮江先生（Lloyd M.Pidgeon）研究开发了炼镁工艺（一种硅热还原法），从此开始了金属镁的工业化生产。皮江法炼镁工艺具有设备简单、技术要求不高、投资小、规模可大可小、成本较低的特点，因此在我国发展很快。但是，目前皮江法炼镁工艺的缺点是能源高，污染严重，劳动强度高。随着人们对环境保护的进一步重视，皮江法炼镁将受到严峻的挑战。本文将着重探讨皮江炼镁技术的提升途径，使之符合清洁生产的要求。[编者按]     

Pd／Ag纤维复合材料的制备工艺

用包套拉伸法和挤压法制备Ｐｄ／Ａｇ纤维复合材料，并通过金相和电子显微镜分别观察其微镜分别观察其微观结构，测试其性能，如电阻率，硬度，强度及接触电阻等。通过对比其工艺性及所得材料的微观结构和性能，认为挤压法优于包套拉伸法。此种Ｐｄ／Ａｇ纤维复合材料适合Ｐｄ／Ａｇ型复合铆钉和生产复铜铆钉。     

深冷处理与工模具的耐磨性

热处理后的金属材料再经低落曙处理，其力学能明显提高，尤其是高碳高合金工模具钢的耐磨性提高特别显著。本文着重研究了应用面较广的Ｗ６Ｍｏ５Ｃｒ４Ｖ２钢的处理工艺制度，组织性能及其磨损机理。     

FORMATION OF MANGANESE SILICIDE THIN FILMS BY SOLID PHASE REACTION

1. IntroductionThe transition metal silicides have attraeted much attention because of their potentialapplicatiOIl in very large scale integration (VLSI) de.ice[1]. Near-noble metal silicides canbe used as Schottky al1d ohn1ic col1tacts in silicon-based d…     

Effect of laser fluences on the structure of carbon nitride films deposited by direct current plasma assisted pulsed laser ablation

Carbon nitride films were deposited by direct current plasma assisted pulsed laser ablation of a graphite target under a nitrogen atmosphere at room temperature. The surface morphology, composition and bonding structure of the deposited films were characterized by atomic force microscopy (AFM), Fourier transform infrared (FTIR) spectroscopy, Raman, and X-ray photoelectron spectroscopy (XPS). The effect of laser fluences in the range 0.5–3 J/cm² on the surface morphology, composition and bonding structure of the carbon nitride films were systematically studied. As laser fluence is increased, AFM results show a great decrease in the surface roughness of carbon nitride films. FTIR and XPS results indicate an increase in the N/C ratio and the content of N atoms bonded to sp³ C, as well as a decrease in the content of H atoms and the content of N atoms boned to sp² C in the deposited films, and Raman spectra indicate an increase in the content of disordered sp² C atoms and the sp² cluster size. The increase in the film density and the decrease in the particle fraction contribute to the decrease of surface roughness with increasing laser fluence.