Software as a bridge between theory and practice in life cycle assessment

Three mutually dependent elements are required for the application of life cycle assessment: methodology, data and software. Obviously, the design of software is determined by the methodology and the type of data available. Conversely, the development of software dictates the way in which data should be collected and recorded, and improves the theoretical framework, as it forces one to state the principles clearly and unambiguously. The influence of the development of software on both data and methodology is addressed and illustrated by examples, with reference to two key terms: transparency and explicitness. Three types of influence are distinguished: the design of a protocol, the formulation in terms of recipes, and the presentation of data.     

莫桑比克的海洋生物学研究:过去、现在及未来

本文概述了莫桑比克包括渔业在内的海洋生物学研究的发展情况.莫桑比克的海岸线约为3000km,海洋的生物资源在莫桑比克的社会中起着重要的作用,主要是作为人们的蛋白质来源以及收入和出口创汇的来源.     

精密模锻模具设计

先从三种角度 :锻造设备和工作条件 ,钢材的加热温度和凹模结构形式对精密模锻模具进行分类 ;然后从六个方面讨论精密模锻模具设计要点模膛设计 ,凹模尺寸设计和强度计算 ,凸模尺寸和强度计算 ,模具的导向装置 ,顶出装置及飞边槽尺寸的设计     

精密模锻件的设计要点

讨论了精密模锻件的分类密集形状的锻件、盘形锻件和长杆形锻件 ,以及精密模锻件的设计要点精密模锻件的机械加工余量、尺寸精度和表面粗糙度、分模面的选择、模锻斜度、圆角半径、肋的设计和腹板厚度的设计     

城市污水处理厂污泥沉降影响因素研究

研究总结了目前城市污水处理厂污泥沉降影响的因素，概括总结了pH值、溶解氧、温度、盐度等环境因素以及磁场等外部环境因素对不同性状污泥的沉降影响。为污泥沉降脱水最佳条件提供了研究思路，也为污泥后续机械脱水提供了基础。     

First-trimester free beta (hCG) screening for Down syndrome

Maternal serum free beta (hCG) levels are elevated (median 2·20 MOM) in the first trimester of pregnancy in 38 Down syndrome cases as compared with appropriate controls. This observation may form the basis for its use as a marker in screening for Down syndrome in the first trimester. Altered levels of the free beta analyte are observed in pregnancy conditions or complications other than Down syndrome.     

铁尾矿地砖的制备及其机理分析

简要介绍了唐山地区铁矿尾矿制备铁尾矿砖的试验研究，并设计制备铁尾矿砖生产工艺流程和最佳配比。研究结果表明，以铁尾矿为主要材料，通过掺加适量的水泥、粉煤灰、粗骨料和一定的外加剂，经常温常压养护28天后，抗压强度可达到28．30MPa，抗折强度为5．63MPa，同时长期性能研究也表明可以制备出合格的铁尾矿地砖。为铁尾矿大量资源化利用辊供了一条新的徐径．同时还对铁尾砖的微观机理作了初步研究。     

Prenatal application of fluorescent in situ hybridization (FISH) for identification of a mosaic Y-chromosome marker,IDIC(Yp)

An amniocentesis was performed at 13.3 weeks' gestation for advanced maternal age. A mosaic sex chromosome pattern was found: of 50 cells examined, 34 had a 45,X karyotype. In 14 cells with a modal number of 46, a recognizable Y was substituted by a small non-fluorescent marker. C-banding identified the marker as an isodicentric in 12 cells. In two cells, the non-fluorescent marker appeared to be monocentric and looked like a non-fluorescent del (Yq), but could have been an isodicentric Y with inactivation of one of the centromeres. Two cells with a modal number of 47 showed two copies of the monocentric marker. Fluorescent in situ hybridization with an alpha satellite Y-specific centromeric probe confirmed the Y-chromosome origin of the markers and allowed for more accurate prenatal diagnostic information.     

辽宁省环境区划方法和分区系统

根据全省自然环境和社会环境结构特征、分异规律、所存在的主要环境问题,依据区内相似性与区间差异性的基本原则,进行了三个层次的三级环境区划。研究各环境区的环境结构、环境特征与环境灾害、环境污染等问题之间的内在联系;揭示生态环境失调与人类生产活动之间的相互关系;探讨各环境区经济发展的环境负荷以及今后发展方向与途径;提出各环境区主要环境问题及其相应的防治、管理对策。