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排序方式: 共有198条查询结果,搜索用时 93 毫秒
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Acardiac anomaly is a rare condition affecting monochorionic multiple pregnancies. We review this condition with emphasis on its prenatal diagnostic features and treatment options. Due to the parasitic hemodynamic dependence of the acardiac twin on the pump twin, it is important to monitor the pump twin for signs of decompensation and, if indicated, intervene by interrupting vascular supply to the acardiac twin. The goal of treatment is to maximize the pump-twin's chance of survival. To assist with the decision of when to treat, we suggest a new classification system based on prognostic factors, specifically the size and growth of the acardiac twin and the cardiovascular condition of the pump twin. When the acardiac twin is small and no signs of cardiovascular impairment in the pump twin are present, we suggest serial ultrasound surveillance to detect any worsening of the condition. In cases with a large acardiac twin or rapid growth of the acardiac mass, we recommend prompt intervention. Once treatment is indicated, the intrafetal approach to interrupt the vascular supply to the acardiac twin appears to be superior to cord occlusion techniques as it is simpler, safer and more effective. The first line of treatment, if available, should be ultrasound-guided laser coagulation or radiofrequency ablation of the intrafetal vessels. Copyright © 2005 John Wiley & Sons, Ltd. 相似文献
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An approach for delineating high anomaly density areas within a mixture of two or more spatial Poisson fields based on limited sample data collected along strip transects was developed. All sampled anomalies were transformed to anomaly count data and indicator kriging was used to estimate the probability of exceeding a threshold value derived from the cdf of the background homogeneous Poisson field. The threshold value was determined so that the delineation of high-density areas was optimized. Additionally, a low-pass filter was applied to the transect data to enhance such segmentation. Example calculations were completed using a controlled military model site, in which accurate delineation of clusters of unexploded ordnance (UXO) was required for site cleanup. 相似文献
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Zhang Jiahua 《中国减灾(英文版)》1997,(1)
Atpresent,theworldclimaticandenvironmentalchangesfromregionstoglobalextentatvarioustimescaleswillallbeinfluencedbyphysical,chemicalandbiologicalinteraction,someofthesechangesarerecordedinmarine,terrestrial,glacialandbiologicalenvironment,thereby,recon-structtemporallyandspatiallysignificanteventspastenvironmentalandecologicalconditions.In198o'sglobalclimatechangehasbeenwidelypaidattentiontointernationalization,aseriesofresearchplansincludingIGBPhasbeensetupandPAGES,BHAC,GCTEareimportantc… 相似文献
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使用滇黔地区钻孔应变观测台站的资料,对2012年9月7日彝良Ms5.7地震前异常现象进行分析,结果表明,震前昭通、贵阳台钻孔应变出现长趋势等异常,其他台站在震前几小时到5天出现曲线异常波动、固体潮变形等异常现象。 相似文献
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利用矢量曲线、γ因子等方法识别苍山MS5.2地震前泰安石英倾斜仪的前兆异常。分析认为:SQ—70石英倾斜仪反映出一定的地形变异常信息。 相似文献
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Russian Journal of Ecology - 相似文献
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许贵明 《防灾减灾工程学报》1995,(3)
在总结井孔水位异常的中长期、短期(临震)、后效不同阶段特征的基础上,提出三项异常指标:1、水位反向,速率(?)≥-20mm/月,V_(max)≥-40mm/月;2、异常幅度,H≥130mm;3、异常时间,T≥3月。井孔的5次水位趋势异常中,与3次江苏省5~6级中强震和1次南京地区3.1级地方震的对应关系较好,映震能力达0.8,不失为单井预测预报中强地震的一种有效方法而具推广价值。 相似文献