耐高压自密封旋转补偿器的选型及应用

介绍耐高压自密封旋转补偿器的原理、优点及选型,列举该补偿器在煤制乙二醇装置中的应用,指出安装注意事项.经实际应用证明该补偿器每年可节约资金400多万元,减排效果明显.     

旋转补偿器在蒸汽管道中的应用

通过在技改项目外管0.8MPaG过热蒸汽管道设计中应用旋转补偿器,运用CAESARⅡ软件对选用补偿器前后管系受力情况进行对比分析,对管道、支架设计等问题进行了探讨。     

π形补偿器的设计和应用

文章主要介绍了π形补偿器的的设计和应用。通过对配管设计等原则进行了分析和探讨,以便于更好地掌握π形补偿器的技术。     

浅谈GSJ-V型旋转补偿器在热力管网中的应用

GSJ-V旋转补偿器是一种新型无推力的管道补偿器，在热力管网的应用中具有极大的优越性和灵活性，无论是架空管道或埋地管道都能发挥其优良的补偿性能。     

动力管道热补偿器的使用

工业生产中动力管道多种多样,部分管道实际生产运行中会出现热胀冷缩,该现象会使管道承受巨大的应力,不合理的管道布置严重情况下容易导致管道变形、破裂,甚至发生安全事故。满足设计规范要求、合理的管道热补偿能避免事故的发生。管道热补偿形式可分为:自然补偿器、方形补偿器、波纹管补偿器等,补偿器的选用原则应依据现场条件、介质参数、经济合理性等综合考虑,补偿器的安装应符合规范及使用要求。     

大型硫酸装置设计中波纹补偿器的选型分析

大型硫酸装置转化工段的设备大、管道直径大、布置紧凑，介质温度高，管道的热膨胀补偿常采用不锈钢波纹补偿器。结合工程实例，以计算机辅助设计软件为手段，分析不锈钢波纹补偿器选型时应考虑的问题，并指出选型原则。     

无推力免维护旋转补偿器在热网系统中的设计及应用

概述了无推力免维护旋转补偿器在32万t／a离子膜法烧碱及配套项目热网系统中的设计、安装及应用方式。     

自然补偿器的设计和应用

文章主要介绍了自然补偿器的设计和应用。通过对配管设计等原则进行了分析和探讨,便于更好地掌握自然补偿的技术。     

套筒式无推力补偿器

<正> 河南开封柳园水暖器材厂生产的套筒式无推力补偿器是利用流体力学平衡原理,综合套管式补偿器、球型补偿器的特点,利用双头填料室的同时作用,加之介质分流,使热力管道由介质压力产生的轴向推力互相抵消。在设计时仅考虑补偿器的摩擦力,在对固定支架的推力计算中,不再计算由介质压力而引起的轴向推力。     

球补替代方补 节能效果显著

介绍了球形补偿器在中温中压管道中的应用，阐述了减少温降、压降及热损失的设计措施，对提高球形补偿器的节能效果有实际意义。     

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.     

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。     

中国粉末涂料行业发展现状之2014

根据国家统计局以及国内外相关机构的数据统计资料,按照自2004年以来的相同数据统计口径,以原材料消耗为基础,编制出我国粉末涂料行业年度数据统计报告,以期为政府制定相关产业政策,企业制定发展规划提供翔实的数据支撑。     

Phospholipid metabolism in cells in culture

The proportions of the different lecithin fractions have been determined in HeLa and KB tissue culture cells and Ehrlich Ascites tumor. 82.8% of the total phosphatidyl choline phosphorus is found in fraction 3 of HeLa cells. The major phosphatidyl cholines found in KB cells and Ehrlich Ascites tumor are in fractions 3 and 4 and representing 66.6% and 88.7% of the total phosphatidyl choline P, respectively. The incorporation of 1,2-¹⁴C-choline and 1,2-¹⁴C-ethanolamine into the various phosphatidyl choline fractions has been assayed to determine their biosynthesis in Ehrlich Ascites tumor. The incorporation of 1,2-¹⁴C-choline into fractions 3 and 4 is 100 times the 1,2-¹⁴C-ethanolamine. This evidence indicates that the methylation pathway of phosphatidyl choline synthesis is very low in HeLa, KB and Ehrlich Ascites cells. One of 13 papers presented at the symposium “Lipid Metabolism in Cells in Culture,” AOCS Meeting, Houston, May 1971. Part of a thesis submitted to the Graduate School of the University of North Dakota in partial fulfillment of the Degree of Master of Science.