森林经营对三峡库区生态环境的影响研究

三峡库区的山地生态系统具有先天脆弱性,人类活动对生态环境的影响强烈,农业生态系统抗逆力差,森林景观破碎化。作为陆地生态系统的主体,持续经营的森林成为维持区域生态平衡的关键因素。开展森林经营对库区生态环境的影响研究,必须从持续发展思想出发,以景观生态学理论为指导原则,采用生态规划的方法,借助遥感（ＲＳ）、全球定位系统（ＧＰＳ）、地理信息系统（ＧＩＳ）技术。在研究内容的选择上,应集中于森林经营的指导原     

碳酸盐岩Sr同位素比值的选择性溶解及测定技术

传统的碳酸盐岩的Sr同位素比值测定由于采用盐酸溶样 ,虽然具有溶解迅速的优点 ,但同时也使非碳酸盐组分被溶解而往往导致测定值偏高 ,同时也增加了Sr分离与纯化的难度。因此 ,我们考虑用弱酸来溶解碳酸盐岩矿样 ,以改进传统方法的不足。实验中采用醋酸作为溶解介质 ,对比了不同浓度的醋酸的溶解效果 ,对较难溶解的白云岩样品作了弱酸溶解实验 ,同时比较了 2 .5mol/L盐酸和 4mol/L醋酸溶样后的测定结果和测定精度。实验结果表明碳酸盐岩Sr同位素的选择性测定技术可以使溶解对象局限于样品中的目标组分———碳酸盐岩 ,防止样品中的非碳酸盐岩组分的溶解 ,避免过多的杂质进入溶解液 ,使碳酸盐岩中的微量元素———Sr(通常含量在 10 4 — 10 5范围内 )的同位素比值测定趋于准确和可靠 ,同时也减少了杂质元素的干扰 ,便于Sr的分离与纯化。     

污泥超声处理研究的进展

阐述了污泥的超声脱水及降解机理，强调了絮凝剂对污泥脱水的重要作用，重点介绍了超声技术在污泥脱水中的研究现状及影响因素包括：频率、声强、功率、反应器的设计与换能器类型、污泥自身因素等进行分析，最后提出了发展方向。     

Coulometric determination of sulfur speciation in natural waters

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True trisomy 15 mosaicism,detected by amniocentesis at 12 weeks of gestation and fetal echocardiography

A case of mosaicism of trisomy 15, with two-thirds of the cells trisomic, was detected at 12 weeks of gestation in amniotic fluid cell cultures obtained with the filtration technique. Ultrasound examination at 13 weeks showed a nodule protruding into the amniotic cavity which was speculated to be remnants of a co-twin, causing the trisomic cell line. At 20 weeks of gestation, a malformation scan (level III) was normal, but supplementary fetal echocardiography revealed a severe cardiac defect (mitral atresia and a ventricular septal defect). Fetal lymphocytes obtained by cordocentesis showed trisomy 15 mosaicism, but only in 5 per cent of the mitoses. After termination, the same percentage of trisomy 15 mosaicism was found in cells from skin and tendon as in the original early amniocentesis. No sign of earlier twinning was found in the placenta or membranes. We conclude that mosaicism in early amniotic fluid obtained by the filter technique in this case reflected the true karyotype accurately and that supplementary echocardiography added significantly to the interpretation of the clinical implications.     

A culture vessel for amniotic fluid cells allowing faster preparation of chromosome slides

A new culture vessel for amniotic fluid culture is presented (flaskette). It consists of a microscope slide, on top of which a culture chamber is mounted. Amniotic fluid cell cultures using in situ technique in the flaskette were compared to subcultured samples in ordinary (Falcon) tissue culture bottles. Working time was reduced by using this new culture vessel because of a very simple harvest procedure allowing simultaneous harvest of 15 samples. The interval between amniocentesis and harvest was shorter for the in situ technique than for the subcultivation technique. The frequency of aneuploidy in individual metaphases was higher with the subcultivation technique. while there was no difference in the frequency of structural anomalies.     

皂市导流洞洞口段上层开挖施工安全技术措施

本文根据皂市电站导流洞洞身上层的地质地形条件，为保证工程开挖安全，就洞口预加固、超前支护、工程爆破和开挖施工方案进行了详细分析和设计，并进行了现场监测监控，结果表明，本导流洞的支护和开挖结构体系是安全的，达到了导流洞开挖和围护工程的安全与稳定要求，对类似工程具有指导和借鉴意义。     

江西水泥工业环境问题及防治对策

采用调查研究的方法，对江西省水泥工业问题进行分析研究，调查表明，江西省与全国相比，技术装备落后，规模小，水泥大中型企业少，旋窑特别是窑外分解窑少，江西省回转窑水泥产量仅占总产量的１６．８％，低于全国平均２０％的水平，粉尘排放量大，居全国各行业第一位，二经硫占全省第二位，对大气污染严重。作者还对江西大、中、小型水泥厂从产业政策及生产过程中的主要污染环节提出了相应的防治对策。     

试论将渤海指定为特殊区域的现实意义

介绍了渤海的污染现状，分析了船舶排放对渤海污染的重要影响，在此基础上，通过对《MMRPOL 73／78》中特殊海域与一般海域不同排放要求的对比，阐述了将渤海划定为《MARPOL 73／78》特殊区域的重要现实意义和必要性。     

离子色谱技术在环境监测中的应用及预处理技术

离子色谱法(IC)作为离子和离子型化合物的精密分析方法,其分析的准确性受样品预处理方法影响较大.本文根据作者的经验,论述了离子色谱法在环境监测中水质、大气、土壤和生态方面的应用,总结了常用的离子色谱法样品预处理方法,对正确选择离子色谱样品预处理方法,提高离子色谱法在环境监测中的分析准确性具有较大的指导意义.