Development Tendency of the Refractories for Iron ＆ Steel Industry in China

This paper introduces the developing tendency of refractories for iron and steel industry combined with the new metallurgical techniques applied in iron and steel industry in China. Refractories for blast furnace long service life, smelting reduction iron-making process, secondary refining metallurgies and clean steel making, near net shape continuous casting are described respectively. To meet the requirement of iron and steel industry, the high quality, multi-functions and environment-friendly refractories with long service llfe will be focused and developed in the future. In addition, high grade refractories in China have great developing space and potential market.     

从霞石的结构特征探析其在陶瓷中的应用

霞石主要生成于富含Na2O而贫SiO2的碱性火成岩及伟晶岩中，晶体呈六方短柱状、厚板状、等粒状集合体或致密块状产出。Na2O、K2O合量为14％～20％，高于长石类。在陶瓷生产中用其取代部分长石，具有较强的熔剂效应，能显著的降低产品     

Side-Surface Structure of a Commercial β-Silicon Carbide Whisker

The side surfaces of a commercial β-SiC whisker were analyzed by calculating the surface energy and observing the microstructure of the whiskers. The results indicated that the side surfaces displayed a type of zigzag structure and were composed of {111}, {110}, and {100} crystal planes.     

α-Fe2O3/煤矸石复合光催化剂的制备及其降解五氯酚性能的研究

以Fe（NO₃）₃、煤矸石和NaOH为原料,采用沸腾回流法制得了一系列不同质量比的α-Fe₂O₃/煤矸石复合光催化剂。采用场发射扫描电子显微镜（FESEM）、X射线衍射仪（XRD）及紫外-可见漫反射光谱（UV-Vis DRS）等多种手段对产物做了表征。以五氯酚为目标降解物,考察了模拟太阳光照下样品的光催化效果。结果表明,将球形α-Fe₂O₃负载于改性煤矸石表面可有效提高其光催化活性,且α-Fe₂O₃/煤矸石复合光催化剂的性能与α-Fe₂O₃的含量有关,当α-Fe₂O₃与煤矸石的质量比为30∶100时,样品的光催化效果最佳,180 min内即可将五氯酚降解完全。此外,α-Fe₂O₃/煤矸石复合光催化剂还具有可重复使用的特点。     

Comments on “Exact and approximate feedback linearization without the linear controllability assumption [Automatica 48 (2012) 2221–2228]”

The conditions for state feedback linearization suggested in the aforementioned article are shown, by means of counterexamples, not to be sufficient. In view of this, modified results are proposed for ensuring the sufficiency.     

Humidity sensitivity of polypyrrole and polypyrrole/SBA‐15 host–guest composite materials

Polypyrrole (PPY) and PPY/SBA‐15 host–guest composite materials have been prepared using chemical synthesis route and characterized by XRD, IR, N₂ adsorption–desorption isotherms, and SEM. The humidity sensitive properties (HSP) of this kind of materials have been studied by analyzing the variation curve of impedance as a function of relative humidity. It was found that the PPY/SBA‐15 host–guest composites materials exhibit better HSP than that of the corresponding pure PPY. © 2006 Wiley Periodicals, Inc. J Appl Polym Sci 102: 3301–3305, 2006     

单扫描极谱法快速测定胱氨酸的研究及应用

在pH 9.6的H3BO3-NaOH介质中,胱氨酸于-0.56 V(vs.SCE)处产生一灵敏的吸附还原波。用于胱氨酸的测定,波高与0.8~10μmol/L的胱氨酸有线性关系,检测限为0.4μmol/L。许多氨基酸在较高浓度共存情况下不干扰胱氨酸的测定。应用该法测定了人发及胱氨酸片剂中胱氨酸的含量。     

大孔树脂法精制甘草酸

介绍了用大孔树脂从甘草中分离精制甘草酸的方法。大孔树脂是目前广泛采用的分离天然产物的方法。用大孔树脂精制甘草酸,使甘草酸和其他杂质得到很好的分离,明显改善了甘草酸的质量。在纯度测定时,采用香草醛-硫酸比色法能准确测定甘草酸纯度。另外,实验使用草酸还原Fe3+的方法改善产品颜色,并在进样前先用活性炭脱色,这两种方法同时使用有效地改善了产品的颜色。     

聚丙烯发泡材料的研究进展

简要阐述了聚丙烯发泡材料的性能,分别从直接使用高熔体强度PP、化学交联/接枝改性、共混/填充改性这三种提高PP发泡性能的途径上对目前聚丙烯发泡材料的研究进展进行了介绍。     

坦克装甲车辆用橡胶履带板的研究开发

探讨了坦克装甲车辆用橡胶履带板（ＴＴＲＰ）的损坏摸式及其机理，从胶料配合，性能测试等方面评 ＴＴＲＰ的研究开发进展，并对我国ＴＴＲＰ的研究提出了建议。