妊娠中期联合检测母血清AFP、β－HCG和uE_3筛查胎儿异常的可能性

用放射免疫法对妊娠１６～２８周１７９例孕妇血清、羊水及胎血进行甲胎蛋白（ａｌｐｈａｆｅｔｏｐｒｏｔｅｉｎ，ＡＦＰ）、人绒毛膜促性腺激素β亚基（ｆｒｅｅｂｅｔａｓｕｂｕｎｉｔｏｆｈｕｍａｎｃｈｏｒｉｏｎｉｃｇｏｎａｄｏｔｒｏｐｉｎ，β－ＨＣＧ）及游离雌三醇（ｕｎｃｏｎｊｕｇａｔｅｄｏｅｓｔｒｉｏｌ，ｕＥ３）的联合检测发现：正常孕妇血清和羊水、胎儿血清中ＡＦＰ、β－ＨＣＧ和ｕＥ３均呈正相关。无脑儿、羊水过少及胎死宫内母血清ＡＦＰ升高，分别为５．２０ＭＯＭ、５．７７ＭＯＭ和１４．０３ＭＯＭ，β－ＨＣＧ和μＥ３为低值；胎儿染色体异常──２１三体、１４三体嵌合体，β－ＨＣＧ值在羊水、母血清和胎儿血清中明显升高，分别为３．８４ＭＯＭ、２．６５ＭＯＭ和１．７５ＭＯＭ，而ＡＦＰ和ｕＥ３水平降低，提示联合检测妊娠中期母血清中的ＡＦＰ、β－ＨＣＧ和ｕＥ３值，不仅可作为产前筛查胎儿染色体异常、神经管缺陷的指标，同时可预示胎儿高危状态和围产儿死亡。     

硒对小鼠亚急性阿霉素心肌损害的保护作用

本文以1次剂量阿霉素(ADR 17.5mg/kg ip)引起小鼠亚急性心肌早期病变,探讨硒的保护作用。预先给硒(Se 80μg/kg×10 ip)可防止ADR所致心肌早期损害(D—PAS染色物质显示的细胞膜通透性增加)。这种保护可能与心肌硒水平和谷胱甘肽过氧化物酶活性增高从而降低脂质过氧化产物水平有部分关系。     

西堠门大桥基准索股架设监控与分析

在西堠门大桥基准索股的施工监控中,采用参数公式法来表达基准索股线形与相关参数的关系,以方便施工控制应用;阐述了公式中各参数的监控方法及应用;分析了基往索股的调整结果与稳定观测结果。实践表明监控工作富有成效、监控方法正确、监控参数取值合理;基准索股达到了调整及稳定观测的要求。本方法可供其它悬索桥施工参考。     

金塘大桥墩座湿接头裂纹控制

金塘大桥是舟山大陆连岛工程的第5座跨海大桥,针对跨海大桥大量应用的墩座湿接头展开裂纹控制研究.金塘大桥墩座湿接头在设计、混凝土配合比、施工工艺、养护等方面采取了裂纹控制措施,取得了显著效果.     

舰船进水过程中沉没判据研究

目前,国内外对于破损舰船沉没判据的研究,主要以舰船破损进水后的最终状态为判断依据,没有考虑进水过程中可能出现的危险状态,有一定的局限性。本文在分析美海军沉没判据不足的基础上,给出新的沉没判据表达式,用以判断舰船在进水过程中是否发生沉没,并通过某船计算验证该沉没判据的准确性。     

Preparation and Characterization of the Covalent-Integrated Poly（lactic acid） and Scrap Leather Fiber Composites

Scrap leather fibers (SLFs) modified with active silane containing epoxide groups were incorporated into poly(lactic acid) (PLA) modified by vinyl trimethoxysilane, i.e., the PLA/SLF composites were prepared for bio-composites by solvent compounding technology in this article. The effects of silane coupling agents on the structures of PLA and SLF molecules were examined, and the mechanical properties and thermal stability of PLA/SLF composites were also measured. The results of Fourier-transform infrared spectroscopy (FTIR) had proved that silane had been incorporated successfully to PLA and SLF molecules by means of the solvent technology. Scanning electric microscopy (SEM) was used to investigate both the changes in shapes between the pristine SLFs and the treated SLFs and the microscopic structures of composites. According to SEM results, it was shown that there were some significant differences between the untreated and treated SLFs, and a double continuous phase structure had occurred in PLA/SLF composites due to the excellent dispersion of SLFs in matrix. The addition of the treated SLFs into PLA resulted in a distinct improvement of the impact and tensile strengths. When the mass fraction of the treated SLFs was 15%, the notched impact strength and tensile strength of PLA/SLF bio-composites were improved by 34.4% and 21.2% compared with the pristine PLA, respectively. Additionally, with the increase of the modified SLFs content, the thermal stability of PLA/SLF bi-composites was apparently improved. The macroscopic properties of bio-composites were found to be strongly dependent on their components, concentration, dispersion and resulted morphological structures.     

南京城市发展与秦淮河整治回顾与展望

该文介绍了六朝时期至上世纪80年代南京城与秦淮河的历史变迁,分析了2000年前后河道整治前的状况,详细阐述了秦淮河整治的内容和方案,并介绍了整治成果及后续治理工程,提出了现存问题及不足。     

英国向ADtranz公司订购Electrostar

ADtranz公司接到订单为c2c铁路(从前的LTS铁路公司)提供28列Electrostar，包括维修合同在内总金额达1.6亿欧元。列车上装有空调、空气弹簧、残疾人用设备和旅客通讯系统，列车运行速度为160 km/h。 预计2002年开始交货，届时将与其他46列Electrostar车组一起运行在c2c线上。列车的维修将由ADtranz公司负责。 刘晓艳译自《LE RAIL》2000， №81，47 魏晓东校