流化床技术在提高尿素产品质量中的应用

应用尿素流化床装置有效解决了因造粒塔能力不足而造成的成品尿素温度偏高、粉尘含量较高、平均粒径偏小、存放易结块等问题，并且具有良好的经济效益。     

Mn2+、Nb5+共掺BaTiO3陶瓷的制备及压电性能的研究

本文采用改进的固相反应法,制备了施主杂质Nb5 和受主杂质Mn2 共掺的BaTiO3陶瓷。按不同Nb5 、Mn2 的掺杂量,分别在1180℃、1210℃、1250℃、1280℃温度下煅烧。实验结果表明:当烧结温度为1250℃、掺杂量为0.05mol%时,制得的试样性能较好。     

疏水性蛋白荧光探针Bis-ANS的合成

疏水蛋白荧光探针8,8’-二苯胺基-5,5’-二磺酸联萘(bis-ANS)是研究蛋白质结构及观察其行为的重要工具。以8-苯胺基-1-萘磺酸铵(ANS)为原料:氧化偶联合成了bis-ANS,通过摸索寻找到一种优良的分离方法,并研究了溶剂、温度对收率的影响,目标产物结构经过核磁共振(1H NMR)1、3CNMR和质谱(MS)确证。     

Syntheses and biological activities of polymers containing methacryloyl‐2‐oxy‐1,2,3‐propanetricarboxylic acid or 5‐fluorouracil

A series of novel copolymers, poly(methacryloyl‐2‐oxy‐1,2,3‐propanetricarboxylic acid‐co‐exo‐3,6‐epoxy‐1,2,3,6‐tetrahydrophthalic acid) [poly(MTCA‐co‐ETAc)], poly(methacryloyl‐2‐oxy‐1,2,3‐propanetricarboxylic acid‐co‐hydrogenethyl‐exo‐3,6‐epoxy‐1,2,3,6‐tetrahydrophthalate) [poly(MTCA‐co‐HEET)], and poly(methacryloyl‐2‐oxy‐1,2,3‐propanetricarboxylic acid‐co‐α‐ethoxy‐exo‐3,6‐epoxy‐1,2,3,6‐tetrahydrophthaloyl‐5‐fluorouracil) [poly(MTCA‐co‐EETFU)], were prepared from corresponding monomers by photopolymerizations at 25°C for 48 h. The polymers were identified by FTIR, ¹H‐NMR, and ¹³C‐NMR spectroscopies. The number‐average molecular weights of the fractionated polymers determined by GPC were in the range from 9400 to 14,900 and polydispersity indices were 1.2–1.4. The in vitro IC₅₀ values of polymers against mouse mammary carcinoma (FM3A), mouse leukemia (P388), and human histiocytic lymphoma (U937) as cancer cell lines and mouse liver cells (AC2F) as a normal cell line were much higher compared to that of 5‐fluorouracil (5‐FU). The in vivo antitumor activities of monomers and polymers against mice bearing sarcoma 180 tumor cell line were better than those of 5‐FU. The inhibition of DNA replication and antiangiogenesis activities of MTCA and copolymers were better compared to those of 5‐FU. © 2004 Wiley Periodicals, Inc. J Appl Polym Sci 94: 57–64, 2004     

Emission inventory of VOCs from mobile sources in a metropolitan region

Based on methodologies developed by US EPA, European EMEP/CORINAIR, and Australian NPI, and the former emission inventory in Korea, two methods were applied to 151 villages in northeastern Seoul, Korea to estimate emission of VOCs from line and area vehicle sources depending on vehicle types with different fuel types. A discharge coefficient method for the line source on the Eastern main road was calculated by multiplying the emission amounts per unit of mileage, and a fuel exhaust coefficient method for the area vehicle sources on other roads was determined as multiplying the emission rates by the actual consumption of excess fuel. Results indicated the methods could be adequate for estimating the amounts of mobile emissions when limited information on mobile emission is available. The methods can be used to develop the emission model for all VOCs emission sources (point and non-point sources), which provides input data of atmospheric models.     

多功能污水处理剂的合成和应用

以含1～4个羟基的有机醇、环氧氯丙烷和有机胺为原材料，在催化剂作用下聚合而成的聚醚型有机胺盐（KL-1），具有浮选净化、杀菌、脱色、缓蚀的功能，通过室内和现场试验表明，KL-1不仅有良好的污油、固体悬浮物去除效果，而且有较好的杀菌和缓蚀性能，是一种具有广泛应用前景和良好经济效益的多功能污水处理剂.     

神木煤的主要性质对其水煤浆特性的影响

研究我国大型优质神木煤田12个煤样的主要性质,对其水煤浆特性的影响。实验表明,煤中水分和含氧官能团是主要因素,水分中以最高内在水分与水煤浆浓度呈线性相关,提出以最高内在水分作为评价指标。并研究了煤浆的改性方法,一是加热方法使水分和官能团脱除,煤表面亲水性降低,使煤浆浓度大幅度提高,二是除去煤中可溶无机离子,可使煤浆粘度降低,并添加某些电解质有可能提高稳定性。     

乙烯装置急冷系统能量回收工艺特点分析

乙烯装置急冷系统接收来自炉区的高温裂解气，为降低乙烯装置能耗，必须尽可能回收裂解气中的热量。文中针对KBR乙烯流程，介绍了乙烯装置急冷系统能量逐步回收的过程及其工艺特点。     

水化放热曲线在研究铝酸钙水泥和浇注料中的应用

为了预测水泥或浇注料的凝结性和强度发展趋势,取1500g按一定程序搅拌好的水泥胶砂或浇注料,迅速倒入模具中,振动10s后置入j-型热电偶,由计算机绘制出其水化放热曲线。浇注料的水化放热曲线形貌不仅能反映水泥的矿物组成和反应活性,而且能反映浇注料中其他原材料(如骨料、氧化铝或二氧化硅微粉和外加剂等)和作业环境对水泥及浇注料的影响,为此可用于水泥与浇注料流变特性的研究和控制,同时也为浇注料用原材料的甄选提供了一种有用的工具。     

俄罗斯石油工业改革的现状和问题

近年来作为俄罗斯经济支柱产业的石油工业，在自身发展过程中，其体制改革和生产等方面都取得一些进步，但目前仍存在着许多急待解决的重要问题，因此对俄罗斯石油工业进行一些概括性的分析和梳理对深刻认识俄罗斯石油工业未来的发展趋势是有益的。