海洋钻机管汇设计与计算

海洋钻机管汇与海洋钻机安全和海洋环境保护密切相关,是海洋钻机重要的组成部分.为改进管汇的设计质量、提高管汇设计与相关标准的符合度,对海洋钻机管汇常用的标准、规范作了分析,提出了管汇设计的一般要求和注意事项.利用管汇应力分析软件对海洋钻机管汇进行了应力计算与模态分析,得到了管汇系统的规范应力和阀门组固有频率,进而分析得出不同用途管汇的设计关注点,以及钢架对管汇阀门组的固有频率影响.通过标准、规范分析和应力计算,使海洋钻机管汇满足了标准及规范要求,提高了设计质量,也为陆地钻机管汇设计、计算和使用提供了借鉴     

更高起点规划建设城市排水设施

上海依托＂世博＂机遇,城市的基础设施得到大幅度提升,但在城市排水安全方面,随着全球气候变暖、温室效应的显现、超标准的暴雨频率不断加大等,使排水系统面临诸多困难和问题。据此,从研究＂十二五＂规划着手,提出了规划方向和改进措施,其目的是能更高起点规划上海的排水设施,使之达到安全、生态、低碳、节能、综合利用的效果。     

浅析标准厂房的开发与设计

改革开放以来,中国的经济社会发展突飞猛进,中小企业在市场中寻找到商机之后,需要在最短的时间内以投资最省的方式使产品批量生产,投放市场,以在市场的竞争中立于不败之地。基于此,标准厂房的诞生有了它的市场基础。20世纪80年代末期,全国掀起了工业园区开发的第一次浪潮,标准厂房的建设和土地批租一起成为工业区招商引资的重要手段。文章基于作者多年从事标准厂房设计的工作经验,介绍标准厂房的一种开发设计思路,供同行参考借鉴。     

城市污水处理升级改造中化学除磷原理及费用

就城市污水处理升级改造中化学除磷原理及费用进行了分析和介绍，指出化学药剂与污水中的磷通过化学反应形成不溶性磷酸盐以沉淀、过滤等方式得以去除。污水中磷浓度越高，化学药剂的利用率也越高，反之亦然；出水磷浓度要求越低，则去除单位磷的化学药剂量越大。     

Microbiological Quality of Raw Milk and Effect on Quality by Implementing Good Management Practices

Raw milk is a complete food which contains protein, fat, sugars, vitamins and minerals. Even though, raw milk is sterile at secretion, contamination of milk by microorganisms can take place during milk handling, storage and other pre-processing activities. The objectives of this study were to assess the initial microbial load and to determine correlation between Methylene blue dye reduction test with standard plate count method and find possible methods to improve the quality and reduce the wastage of raw milk. As per the records obtain from the chilling centers, about twenty per cent (per month) of raw milk collected to the centers in each district has to be discarded due to spoilage. Out of 13 chilling centers in Kurunagala district, five chilling centers namely Badalgama, Elabadagama, Kuliyapitiya, Dambadeniya and Minuwangoda chilling centers were randomly selected and the initial microbial loads of milk from chilling tanks were tested using Standard Plate Count and Methylene blue dye reduction test. Further, Self- filled questionnaire was used to gather data related to practices in milk supply chain and swab samples were taken from the containers used for milk collection process. Though the microbial population should be below log 6.00 according to the factory standards in Sri Lanka to accept milk for further processing, standard plate count of chilling centers were log 7.08, 6.76, 6.56, 6.70, and 6.88 (CFU/ml) respectively. Good management practices were introduced to rectify the main cause for high microbial counts. After the improvements low microbial counts of above chilling centers were achieved as log 5.91, 5.85, 5.85, 5.86 and 5.94 CFU/ml respectively. Standard Plate Count showed significant difference (p < 0.05) after practicing good management practices. Strong correlation (r² 0.91) was observed between Methylene blue dye reduction test and Standard Plate Counts (log CFU/ml). Therefore, Methylene blue dye reduction test can be used effectively, economically and efficiently, to detect the quality of raw milk and can use as an alternative method for costly and tedious microbiological analysis methods.     

静压桩爆桩的原因分析与对策

根据多年的施工经验和现场调查，参考了管桩部分的规范标准，对静压桩爆桩的原因进行了分析，提出了在管桩生产和静压桩施工中应注意的问题和预防控制措施，从而确保静压桩工程的顺利进行。     

关于主成份分析方法中的若干理论问题

针对目前一些介绍主成份分析法应用的文章中暴露出来的问题，对主成份分析方法的实质和特点予以揭示。     

电气专业施工图审查中常见的若干问题

结合多年来施工图审查经验,列举了电气专业施工图审查中经常发现的某些问题,并进行了分析讨论,提出电气设计时应注意的某些问题,从而提高电气设计质量。     

浅释现代可靠性理论在建筑结构设计新规范中的应用

本文对现代可靠性理论在建筑结构设计新规范中的应用进行了简要的阐述,主要包括新旧规范的本质区别,可靠指标β的意义及选取,可靠度在实用设计表达式中的具体体现等,以帮助有关人员认识新规范的科学性、先进性和统一性,正确理解、运用新规范。     

交流接触器和电动机起动器的新国标GB14048.4

简要介绍有关接触器和起动器新国家标准的基本内容,并对GB14048.4的编制及与国内老标准JB2455等、与IEC947-4-1等的主要差异作出说明,就国内现有产品及正在开发的新产品如何达标提出建议.