Prenatal diagnosis of tuberous sclerosis. Use of magnetic resonance imaging and its implications for prognosis

Tuberous sclerosis (TS) is an autosomal dominant disorder with a high rate of de novo mutation. The real difficulty is to ascertain the diagnosis and to give the neurological prognosis in each case. Prenatal diagnosis of TS is generally based on ultrasonographic signs of multiple cardiac tumours, i.e. rhabdomyomas. Recent progress in magnetic resonance imaging (MRI) enables the diagnosis in a large proportion of cases based on typical brain lesions. It may have a role in the prenatal management of TS, although MRI images seem to underestimate the anatomical findings. Two cases in which TS was diagnosed prenatally are presented with reference to the value of MRI in the prenatal management and comparison with anatomical findings.     

静态混合器在污水处理装置上的应用

介绍了螺旋式管道静态混合器的结构和原理．在PTA污水处理装置上，采用三级静态混合器进行得水混合，代替了均质池加搅拌机的传统混合方法．收到了良好的效果．实现了投资省、耗能低、维修容易、混合效果好的目的．为污水处理领域进行污水混合提供了新的行之有效的方法．     

从粉煤灰中提取有用元素的研究

本文就采用选矿方法从粉煤灰中提取铁和碳作了系统的研究，同时提出了进一步利用粉煤灰的途径。     

Effects of cracks and some key factors on emissions of nitrous oxide in paddy fields

IntroductionNitrousoxide,N2Oisofenvironmentalimportancebecauseitcontributestoglobalwarmingandthedepletionofthestratosphericozonelayer(Smith,1982).Itsatmosphericconcentrationisstillincreasingatarateof025%—031%peryear(Rodhe,1990).SignificantsourcesofN2Oarefoundinterrestrialecosystemsasaresultofnitrificationanddenitrificationprocessinsoils(Bouwman,1993).Globally,anthropogenicactivityaccountsfor64%oftotalN2Oemissions,towhichagriculturecontributes92%(Duxbury,1982).Therearesomedifferencesbetwe…     

长三角湖州市土壤磁化率与铜、锌有效量和全量分布规律

通过对84个地表土样、17个剖面土样和11个基岩样的磁参数与化学分析测试,对湖州市土壤磁化率与重金属元素Cu、Zn有效量和全量分布规律、成因及两者的相关性进行了研究。研究发现:①表层土壤磁化率高值异常区总体上与土壤重金属元素Cu、Zn有效量和全量高值分布区吻合程度非常高;剖面土壤磁化率值与Cu、Zn有效量和全量含量总体上均呈现出向下递减的相同特点。②表层土壤磁化率与Cu、Zn有效量和全量高值异常均系人类经济工程活动影响所致,主要与当地城镇生活垃圾随意堆放、垃圾施肥、工业“三废”排放、农药和化肥的过量使用等有关。③表层土壤磁化率值与重金属元素Cu、Zn有效量和全量含量之间在不同环境条件下相关性存在明显差异。     

"磁种-高梯度磁分离"污水除磷技术的研究

通过添加磁种和混凝剂,用高梯度磁分离方法去除污水中正磷酸盐污染物,并对工艺参数进行了探讨.     

磁流体处理印染废水初探

探讨了Fe3O4磁流体在不同条件下对降低印染废水的COD和色度两个方面的影响，实验表明，当pH=11，十二烷基叔胺的量是亚铁量的0．16倍时，COD降低最多，脱色效果最好，且磁场强度在160mT左右时，磁流体沉降最快。     

Hierarchical modeling of count data with application to nuclear fall-out

We propose a method for a Bayesian hierarchical analysis of count data that are observed at irregular locations in a bounded domain of R². We model the data as having been observed on a fine regular lattice, where we do not have observations at all the sites. The counts are assumed to be independent Poisson random variables whose means are given by a log Gaussian process. In this article, the Gaussian process is assumed to be either a Markov random field (MRF) or a geostatistical model, and we compare the two models on an environmental data set. To make the comparison, we calibrate priors for the parameters in the geostatistical model to priors for the parameters in the MRF. The calibration is obtained empirically. The main goal is to predict the hidden Poisson-mean process at all sites on the lattice, given the spatially irregular count data; to do this we use an efficient MCMC. The spatial Bayesian methods are illustrated on radioactivity counts analyzed by Diggle et al. (1998).     

油气田噪声对环境的影响

噪声对人体在生理及心理上的危害和影响是相当严重的。随着油气田开发建设的进展，油气田环境噪声污染日益引起人们的关注。弄清油气田噪声污染及治理现状，正确预测噪声污染的发展趋势，将有利于噪声污染的控制和治理。通过对1986年以来油气田噪声监测数据的统计，详细阐述了区域环境、功能区及道路交通三方面的噪声污染现状，指出交通、工业、施工和生活等噪声源是我国城市目前主要的噪声污染源，预测了我国噪声污染将继续增大的发展趋势并提出了相应的控制和治理措施以及改革建议。     

磁性生物炭的制备、表征及对磷的吸附特性

处理成本高、分离难度大是当前湖库等相对封闭水体磷治理工程中的主要问题。为此,以廉价农林废弃物花生壳为主要前驱物与Fe_3O_4纳米颗粒复合制备一种低成本、可磁分离的磁性生物炭吸附剂,研究了热解温度(400℃、500℃、600℃)、溶液pH值、阴离子(Cl~-和SO_4~(2-))共存等因素对复合材料吸附性能的影响。结果表明,复合后的磁性生物炭最大吸附量相比复合前提升了3~5倍。动力学数据拟合结果表明,拟二级动力学方程能较好地拟合吸附过程。磁性生物炭的零电荷点(均7.5)与前驱物的热解终温在试验范围内呈现明显的正相关,表明引入Fe_3O_4后可明显增加磁性生物炭表面电荷,进而有效提升吸附性能。此外,阴离子共存试验表明,磁性生物炭对磷具有较好的选择性。