炼油装置运行周期评估技术及应用

炼油装置运行周期评估技术通过统计、分析装置故障数据,计算特定时间段装置的可靠性,进而获得装置可靠性随时间的变化规律和装置可靠性最差设备排序。介绍了该技术在某常减压装置的应用,应用结果表明,该评估技术为科学确定炼油装置运行周期提供了决策依据。     

Prenatal cytogenetic diagnosis after transabdominal chorionic villus sampling in the first trimester

First trimester prenatal cytogenetic diagnosis was attempted in 350 pregnancies after trans-abdominal chorionic villus sampling. The cytogenetic investigation was performed using both a short-term method (24 h incubation) and cell culture. Adequate samples were obtained in 99·1 per cent and in all these cases the fetal karyotype was established. A chromosome abnormality was found in 2·0 per cent of cases. A discrepancy between the karyotype obtained after 24 h incubation and the karyotype in cell culture was observed in 2·3 per cent. Maternal cell contamination in the cultures was confirmed in 13 of 181 cases where the 24 h incubation revealed a male karyotype. Studies of culture morphology showed that colonies of convoluted cells may serve as a marker for contamination with maternal cells in culture. For the present, we recommend using a short-term method as well as cell culture for cytogenetic investigation until the problems with karyotype discrepancy and maternal cell contamination have been further clarified.     

Maternal sex chromosome mosaicism diagnosed by amniocentesis and percutaneous umbilical cord sampling

We present a remarkable chain of events in which percutaneous umbilical cord sampling was performed in an attempt to clarify a situation of possible fetal sex chromosome mosaicism in an amniotic fluid culture and led to the discovery that the mother herself had a 45,X/46,XX/ 47.XXX chromosome constitution. This may have simply represented the chance concurrence of pseudo-mosaicism in the amniotic fluid culture of a woman with an abnormal sex chromosome constitution, but it is also possible that the 45,X colony was maternal in origin. Although clearly a most unusual circumstance, the possibility should be kept in mind when termination of a pregnancy is being considered because of apparent mosaicism in a prenatal diagnostic study.     

射流曝气SBR技术在屠宰废水治理中的应用

介绍了应用射流曝气和序列间歇式活性污泥（ＳＢＲ）治理屠宰废水的工程实例。半年多的运行情况表明，该系统具有很好操作性和稳定性，当系统污水排放量或有机负荷发生较大波动时，有较好的缓冲适应能力，并能保证整个系统稳定达标。     

国内外环境监测分析的现状和发展

从实验室分析仪器和技术、与污染物总量控制有关的自动监测系统和技术，与应急事故监测有关的现场简易监测分析仪器和技术等方面概括介绍了环境监测分析仪器和技术的现状与发展，并概要介绍了日美及中国环境监测分析产业的现状与发展。     

Reproductive behaviour and prenatal diagnosis following genetic termination of pregnancy in women of advanced maternal age

One hundred and fifty-one women of advanced maternal age who underwent genetic termination of pregnancy (TOP) were studied for their reproductive behaviour and the type of procedure for prenatal diagnosis in a subsequent pregnancy. A total of 59 women (39 per cent) had a further pregnancy. In all continuing pregnancies prenatal diagnosis was performed, of which 75 per cent consisted of chorionic villus sampling (CVS). Reproductive behaviour following a genetic termination was negatively correlated with maternal age and parity. Both reproductive behaviour and the choice to undergo a diagnostic procedure in the next pregnancy were independent of the type of diagnostic procedure in the previous affected pregnancy.     

物理化学预处理与膜分离技术的应用

将物理化学预处理与膜分离技术深度处理结合应用于工业废水处理，可使其中的Ｃｒ６＋＜０．５ｍｇ／ｌ，Ｚｎ２＋＜２０ｍｇ／ｌ，ｐＨ６～９。用膜分离技术处理造纸废水可回收其中的木质素和糖份，回收率均为６０％左右。     

网上职业安全教育培训刍议

通过对网上培训的介绍及网上教育系统的分析，提出了网上安全培训系统的发展方向，对网上职业安全教育培训系统建立和实现形式提出了看法。     

依靠安全科技搞好安全生产

对搞好安全生产必须依靠安全科技进行了论述.提出了在安全工作中必须运用科技手段的必要性和必须正视的几个现实问题.     

实施总量控制与环境技术市场发展

实施总量控制为环境技术市场的发展创造了条件，对环保产业提出了更高的要求，也将推动环境技术市场竞争正常化。