广钢金石分公司石灰竖窑尾气除尘探讨

回顾了广钢金石分公司竖窑石灰生产的尾气除尘方法，分析了其优缺点，同时分析了双膛窑尾气除尘的成功经验，提出了解决竖窑尾气除尘的措施。     

安全工程技术领域数字孪生应用研究综述

为系统了解安全工程技术领域数字孪生应用现状并预测其发展趋势,综述国内外安全工程领域数字孪生应用进展,主要包括数字孪生在动态仿真、安全监控、故障诊断、运维控制、预测性维护等方面的应用,展望未来数字孪生在安全工程技术领域的研究方向.研究结果表明:数字孪生技术在机械工业、航天航空、石油化工、矿山、电气、船舶运输、建筑施工、城...     

The vanishing twin: An explanation for discordance between chorionic villus karyotype and fetal phenotype

One ‘erroneous’ diagnosis occurred in 200 first-trimester chorionic villus samples (CVS) analysed. In direct preparations following 24 h incubation as well as in long-term cultures, a 46.XX karyotype was observed in the villi (28 and 25 cells, respectively). At 20 weeks of gestation, labour was induced because of fetal death in utero. An autopsy performed on the fetus revealed a male phenotype. Placenta and fetal tissues were not submitted for cytogenetic studies. The discordant CVS karyotype (46,XX), in view of the male fetal phenotype, prompted further cytogenetic and molecular studies. Chromosome marker studies on the parents' blood and chorionic villi confirmed both maternal and paternal inheritance of chromosomes in the CVS. DNA studies on formalin-fixed skin using a Y-specific probe, DYZ1, confirmed the presence of a Y chromosome in the fetus. The most likely cause of the discrepant CVS karyotype is the presence of an undetected degenerating dizygotic twin.     

Twin–twin transfusion syndrome—possible roles for doppler ultrasound and amniocentesis

A 29-year-old woman was referred for suspicion of twin-twin transfusion syndrome (TTTS). Several ultrasonographic and neonatal criteria of TTTS were encountered in this twin pregnancy. The peculiar observations in this case were, firstly, the demonstration of superficial anastomosis by Doppler ultrasound and, secondly, that one single therapeutic amniocentesis could have been sufficient to partially correct the progression of the syndrome, as after amniocentesis it was no longer possible to demonstrate the vascular communication. This observation suggests that superficial anastomoses could also have a role in the genesis of TTTS. Their effect could be monitored by Doppler ultrasound and could be more easily corrected by therapeutic amniocentesis.     

Central nervous system damage and other anomalies in surviving fetus following second trimester antenatal death of co-twin. Report of four cases and literature review

Four cases of multiple gestation with second trimester death of one fetus and subsequent damage to a survivor are reported. Monochorionic placentation was documented in three of the cases. Central nervous system lesions occurred in all cases, and bowel injury was noted in two of the damaged fetuses. Although rare maternal clotting problems have been reported in similar situations, none was noted in any of these four cases. Prior reports have indicated that losses in the first half of gestation were of no consequence to the surviving fetuses. These four cases contradict this suggestion, and indicate that close sonographic observation of the survivors is important in any multiple gestation where one fetus has died.