火焰喷涂塑料粉末

介绍了塑料粉末火焰喷涂的原理、装置及工艺,聚乙烯、EVA树脂、尼龙、聚苯硫醚、氯化聚醚等涂层材料,以及这些涂层材料的耐腐蚀性能。     

聚乙烯粉末涂层钢管

主要介绍聚乙烯树脂的物理性能、聚乙烯粉末涂层钢管(含异形管、油罐、接头)的制造、检查方法及制造的范围、涂层钢管的特性和用途等。     

氟树脂防腐蚀涂层涂装工艺的研究进展

综述了氟树脂涂料的种类和基本性能、氟树脂改性的方法；氟树脂防腐蚀涂层涂装工艺中的金属表面预处理、涂层配方设计及涂装方法等方面的研究进展；着重阐述了梯度涂层共混改性技术。     

改性聚乙烯在活塞式隔膜泵中的应用

系统地研究了聚乙烯的性能特征和成膜工艺，研制了改性PE涂膜，讨论了交联剂、助剂、颜填料对涂层性能的影响。应用结果表明改性后的聚乙烯完全符合防腐涂层的要求。     

回收聚乙烯对海底管道防腐涂层性能的影响

回收聚乙烯的应用领域越来越广泛,但不适用于海底管道防腐涂层。介绍了回收聚乙烯对管道三层聚乙烯涂层系统的危害,通过大量的实验以及涂层腐蚀评估,分析了其对管道防腐涂层性能的影响,提出在海底管道防腐涂层中应限制回收聚乙烯的使用。     

高密度聚乙烯树脂HD5010的开发

在引进装置上，使用Ｍ１１催化剂，采用ＢＰ气相流化床工艺开发出单丝级高密度聚乙烯树脂ＨＤ５０１０。阐述了反应机理、工艺设计、产品质量等技术问题，同时对产品用途、应用效果等做了介绍。     

双峰高密度聚乙烯树脂的开发前景

HDPE装置采用淤浆法生产高密度聚乙烯,描述了双峰高密度聚乙烯树脂的特点,介绍了双峰HDPE产品物性参数、聚合工艺和质量指标,概括了影响双峰高密度聚乙烯树脂物理性质的三个主要因素(聚合方式、所用共聚单体、所用稳定剂),阐述了双峰高密度聚乙烯树脂的研制开发前景。     

涂覆级LDPE专用树脂18G-10的工业开发

对比分析了三种涂覆级地低密度聚乙烯(LDPE)树脂(燕山石化公司1C7A、大庆石化公司18G以及卡塔尔石化公司LA-0710)的结构和性能.在此基础上,调整了18G的聚合工艺条件,并以丁烯作为分子量调整剂,生产了新型涂层树脂18G-10.结果表明:18G-10的熔体质量流动速率为6.54g/10min,密度为0.918g/cm3,口模膨胀系数为1.6,熔体强度为0.07N;新的聚合工艺有效地解决了大庆石化公司LDPE涂层树脂专用料加工温度低、缩幅大的问题.     

160kt／a聚乙烯树脂颗粒的气力输送国产化设计

本文介绍抚顺石化总公司乙烯化工厂年产１６万吨聚乙烯装置的聚乙烯树脂颗粒成品气力输送系统改造工程设计，设计选用的设备，管道，电气仪表全部国产化，投产后输送能力达到设计要求，而且运行正常。     

基体表面状态对聚乙烯涂层结合强度的影响

利用砂纸打磨、酸冼、磷化、喷砂、KH-560硅烷处理等不同表面预处理工艺对Q235钢基体进行预处理。并在不同表面状态的钢基体上制备聚乙烯涂层，研究了不同预处理工艺对聚乙烯涂层结合强度的影响。结果表明：传统表面处理工艺提高涂层结合强度有限，而KH-560硅烷处理可以显著提高涂层结合强度，较用传统的砂纸打磨（60^#）、酸冼、磷化、喷砂处理工艺分别提高了40．3％、46％、17．6％和13．2％，而涂层的破断形式也有别于传统的处理方法，为内聚断裂；“喷砂＋KH-560”预处理法可以获得最大的涂层结合强度。     

佛山市顺德新城区降水中污染物的监测和分析

为掌握佛山市顺德新城区降水中污染物的情况,2015年7月至8月,文章作者分别在雨天进行了降水取样,对降水中的pH、电导率、常见阴离子(F-、Cl~-、NO_3~(2-)、SO_4~(2-))及部分重金属(铅和镉)进行监测分析。选择有相关数据的珠江三角洲和石家庄、厦门等地的降水中污染物的情况进行对比。结果表明,顺德新城区降水中的p H和部分阴离子浓度优于珠江三角洲平均值,酸雨类型属于硫酸和硝酸混合型;其水体洁净程度略差于石家庄;铅和镉的浓度也高于厦门,甚至部分超出了人体能直接接触的安全范围。     

Metabolism of trideuterated iso-lignoceric acid in rats in Vivo and in human fibroblasts in culture

Saturated very long chain fatty acids (fatty acids with greater than 22 carbon atoms; VLCFA) accumulate in peroxisomal disorders, but there is little information on their turnover in patients. To determine the suitability of using stable isotope-labeled VLCFA in patients with these disorders, the metabolism of 22-methyl[23,23,23-²H₃]tricosanoic (iso-lignoceric) acid was studied in rats in vivo and in human skin fibroblasts in culture. The deuterated iso-VLCFA was degraded to the corresponding 16- and 18-carbon iso-fatty acids by rats in vivo and by normal human skin fibroblasts in culture, but there was little or no degradation in peroxisome-deficient (Zellweger’s syndrome) fibroblasts, indicating that its oxidation was peroxisomal. Neither the 14-, 20-, and 22-carbon iso-fatty acids nor the corresponding odd-chain metabolites could be detected. In the rat, the organ containing most of the iso-lignoceric acid, and its breakdown products, was the liver, whereas negligible amounts were detected in the brain, suggesting that little of the fatty acid crossed the blood-brain barrier. Our data indicate that VLCFA labeled with deuterium at the ω-position of the carbon chain are suitable derivatives for the in vivo investigation of patients with defects in peroxisomal β-oxidation because they are metabolized by the same pathways as the corresponding n-VLCFA. Moreover, as iso-VLCFA and their β-oxidation products are readily separated from the corresponding n-fatty acids by normal chromatographic procedures, the turnover of VLCFA can be more precisely measured. A preliminary report of part of this work (Reference 18) was presented at the 5th International Symposium on the Synthesis and Applications of Isotopes and Isotopically Labelled Compounds, Strasbourg, France, June 20–24, 1994.     

高效液相色谱法分析化妆品中微量成分的研究进展

综述了高效液相色谱法在化妆品中防腐剂、防晒剂中紫外线吸收剂以及性激素的检测等几个方面的应用;同时,介绍了分析所用的色谱柱、流动相、使用的检测手段以及样品的提取方法;最后针对目前存在的问题,提出了高效液相色谱用于化妆品中微量成分分析的研究方向和发展前景。     

Denitrification in shallow groundwater in a coastal agricultural area in Japan

In a coastal agricultural area in the central part of Japan (Shizuoka), we found decreasing nitrate concentration with depth in a shallow groundwater, where the depth to water table varied between 0.6 and 1.2 m below ground surface. High nitrate concentrations (5–29 mg N L^–1) were often observed in the upper layer (0–2 m) of the groundwater, but the concentration decreased to less than 1 mg N L^–1 in the deeper layer. Ammonium was scarcely detected, and the concentration of dissolved oxygen was usually low (< 1 mgO₂ L^–1) in the groundwater. Nitrate in the groundwater often had very heavy nitrogen stable isotope ratios (>20{}). There was a negative relationship between nitrogen stable isotope ratio of nitrate and its concentration. When nitrate was injected into the groundwater with acetylene and bromide (a conservative tracer), nitrate concentration decreased to 20% of the initial level within 5 days, accompanied by the increase in nitrite and nitrous oxide concentration and a little change in bromide concentration. These results indicate that microbial denitrification plays a potential role in the decrease of nitrate in shallow groundwater at the study site.     

我国硝酸工业生产技术新进展

系统叙述了我国硝酸工业2000-2007年生产现状及主要技术成果,尤其指出了国产"四合一"机组的成功投运,使我国硝酸国产化装置取得较大的进步,表现在吨酸的铂耗、氨耗和能耗等方面接近国外引进装置水平,同时介绍了国外双加压法硝酸生产技术的进展.我国已成为硝酸生产大国,仍需以先进的技术改造和发展我国硝酸工业,确保我国硝酸工业健康有序地发展,加快从硝酸生产大国向强国迈进的步伐.