Normal development in two six-year-old boys born after prenatal diagnosis of trisomy 20 mosaicism

Prenatal diagnosis of trisomy 20 mosaicism was made in two pregnancies by chromosome analysis of cultured amniotic fluid cells. In both cases, the pregnancy continued to term and a healthy male infant was delivered. Regular assessments up to the age of 6-5 years revealed normal physical and intellectual development in both children.     

Methods of Assessing and Achieving Normality Applied to Environmental Data

2 and particle concentrations. Results show that the analyzed transformations work well and are very useful to achieve normal distributions.     

采用消声障板控制通风管路送、回风口声辐射的研究

根据扁矩形消声通道二维消声理论替代一维理论导出的消声系数Φ（α），研究了障板消声结构的Φ（α）计算机程序和消声量与障板几何尺寸的关系     

黑龙江省平水期地表水总磷构成的研究

通过对黑龙江省平水期地表水总磷监测结果分析,探讨地表水总磷的构成、成因;提出了从源头治理地表水总磷污染建议。     

新一代大气扩散模型(ADMS)应用研究

应用一般的高斯模型与新一代大气扩散模型 (ADMS) ,分别计算了朝阳市区在不同的气象条件下的SO2 日均浓度 ,并与实测浓度进行了对比分析。结果表明 :应用ADMS模型可以得到与实测浓度较一致的结果     

Estimation of Normal Variance Based on Balanced and Unbalanced Ranked Set Samples

In this paper we address the problem of estimation of the variance of a normal population based on a balanced as well as an unbalanced ranked set sample (RSS), which is a modification of the original RSS of McIntyre (1952).We have proposed several methods of estimation of variance by combining different unbiased between and within estimators, and compared their performances     

Interstitial deletions without phenotypic effect: Prenatal diagnosis of a new family and brief review

A 39-year-old woman (G4P1SAB2) was referred for amniocentesis for advanced maternal age. An interstitial deletion of the G-dark band 11 pi 2 was found in the fetus. Blood from the mother and her previous son was cultured and the same deletion was found in both. The absence of phenotypic effect in this family further confirms that G-dark euchromatic deletions are compatible with a normal phenotype, and underlines the importance of checking familial karyotypes even when apparently unbalanced structural rearrangements are found at prenatal diagnosis.     

Normal second-trimester amniotic fluid alphafetoprotein and acetylcholinesterase associated with fetal sacrococcygeal teratoma

Amniocentesis was performed at 19 weeks' gestation on a patient with two sequential serum alphafetoprotein values above 2 times median. Ultrasound examination suggested a possible sacrococcygeal teratoma. However, both amniotic fluid alphafetoprotein and acetylchol-inesterase were normal, and the patient elected to continue her pregnancy. At 24 weeks fetal demise was confirmed, and prostaglandin induction of labour produced a macerated female fetus with a large sacrococcygeal teratoma.     

Data classification and performance evaluation for the most commonly-used univariate alarm systems

Alarm systems are critically important for safe and efficient operations of industrial plants, but many industrial alarm systems are suffering from too many nuisance alarms. This paper proposes a method to classify normal and abnormal data segments and evaluate performance indices for the most commonly used univariate alarm systems. The proposed method consists of three steps. First, piece-wise linear representations are exploited in separating historical data samples of an analog process variable configured with alarms into data segments with same qualitative trends. Second, data segments are classified into normal, abnormal and unclassified conditions via a mean hypothesis test; a required assumption is that data segments in normal and abnormal conditions have different mean values being distinguishable from alarm thresholds. Third, based on the normal and abnormal data, performance indices of univariate alarm systems are calculated, including two newly formulated ones as the false alarm duration ratio and the missed alarm duration ratio. The effectiveness of the proposed method is illustrated by numerical and industrial examples.     

煤矿安全系统的计算机统计控制方法

煤矿安全系统在稳定状态，安全监测设备的数据符合正态分布。无事故发生时，控制图表示监测数据样本均值和极差的数据应以９９．７％的概率落在控制区内。运用统计学理论和方法分析、控制均值和极差点的位置及点间关系，可以达到预测和控制安全系统事故的发生和发展的目的。