Results 21 to 30 of about 9,953 (194)
Ultrasound in Obstetrics &Gynecology, Volume 66, Issue 5, Page 582-588, November 2025.ABSTRACT Objective The corpus callosum (CC) is an interhemispheric structure that facilitates communication between the two cerebral hemispheres. Anomalies of the CC are frequent and associated with a wide spectrum of altered neurodevelopmental outcomes.
R. Corroenne +55 more
wiley +1 more source
Analytical Model of Eddy-current Coil Impedance Based on Second Order Vector Potential [PDF]
, 2016 涡流线圈作为电磁换能器的重要组成，在各类电磁无损检测中均有广泛应用。涡流线圈的阻抗解析建模，可以为换能器的设计、及涡流检测的正、逆问题求解提供理论指导与参考。 国内外学者针对该问题的研究主要集中在解析模型的改进与创新、缺陷的反演以及解析模型适用性的扩展，包括被测导电体的特性、涡流线圈与被测导电体的相对位置关系及涡流线圈的类型、参数等。 目前，对任意形状涡流线圈的解析建模工作，主要通过忽略线宽降低求解问题的维度，或对具有一定截面的简单线圈进行叠加，并忽略线圈相互叠加时的细节问题 ...
黄一民
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Ultrasound in Obstetrics &Gynecology, Volume 66, Issue 5, Page 621-630, November 2025.ABSTRACT Objectives To compare the maternal hemodynamics of Chinese women at low and at high risk for preterm pre‐eclampsia (PE) and assess the differences in hemodynamic parameters between high‐risk women with or without prophylactic aspirin. Methods This was a prospective longitudinal case–control study of 857 Chinese women with a singleton pregnancy
X. Wang +11 more
wiley +1 more source
Investigation of Piezoelectric Ultrasonic Technology Based on MEMS [PDF]
, 2009 本文主要研究基于MEMS的压电超声技术，包括超声检测、超声微流体驱动技术和ZnO压电薄膜材料及器件的研究，研究课题属于当前微机电系统中较为前沿和创新的学科领域，如下所述： 1、超声共振谱技术(ResonantUltrasoundSpectrum,简称RUS)是上个世纪九十年代发展起来的一种表征材料特性的方法，该方法成为现代超声检测的较为常用的技术手段，其测量的范围广泛，在MEMS领域内，可用于微型器件的检测。在RUS测量过程中，试件样品通常被夹在两片压电换能器之间 ...
孙宏明
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Impact of race‐based customization on detection of fetal growth restriction
Ultrasound in Obstetrics &Gynecology, Volume 66, Issue 4, Page 480-485, October 2025.ABSTRACT Objective Fetal growth standards determine which fetuses are diagnosed with fetal growth restriction (FGR) and become candidates for enhanced fetal monitoring. Given the existence of race‐based differences in fetal and neonatal weights, we sought to determine the impact of race‐based customization of fetal growth curves on the antenatal ...
P. Ramesh, L. Lemon, J. C. Larkin
wiley +1 more source
Spectral Analysis and Application in Weak and High-frequency Signal of Optical Fiber Sensors [PDF]
, 2014 在光纤传感系统中，微弱传感信号和高频传感信号的精确检测一直是研究的热点。微弱的光纤传感信号易受到检测仪器的本底噪声或者外界环境的干扰，经常淹没在噪声中，此时无法对微小传感变量进行精确判断。现今提高光纤传感器系统检测精度的方法大都为对光纤传感器的结构进行改进或对传感信号进行时域的降噪处理。在结构改进方面可以采用低噪声高放大倍数的光电转换电路或在解调系统中引入干涉仪等，但这些方式都会增加的传感系统的成本及复杂度，特别是干涉仪的引用还会降低系统的抗干扰性。对传感信号进行降噪处理如采用小波变换 ...
陈熙
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Ultrasound in Obstetrics &Gynecology, Volume 66, Issue 2, Page 200-209, August 2025.Abstract Objectives Neonates with critical congenital heart disease (CCHD) are at risk for adverse early brain development and long‐term neurodevelopmental sequelae. Insulin‐like growth factor‐1 (IGF‐1) and insulin‐like growth factor binding protein‐3 (IGFBP‐3) are essential contributors to brain growth and maturation.
M. Nijman +33 more
wiley +1 more source
The Role of SRC-1 in myocardial infarction [PDF]
, 2016 类固醇激素受体辅激活子（steroidreceptorcoactivator，SRC）作为一类转录协同因子，能够与多种转录因子相互作用并增强其转录活性。SRC-1是SRC家族（SRC-1/NCoA-1、SRC-2/GRIP/TIF2、SRC-3/AIB1/ACTR/pCTP/RAC3/TRAM-1）的一员。已有的研究表明SRC-1在体内具有多种生物学功能，SRC-1可参与乳腺癌、前列腺癌、肝癌等多种癌症的增殖与入侵。SRC-1在脑内突触的可塑性、神经干细胞分化等生理过程具有重要调控作用。此外，SRC ...
占少鹏
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Ultrasound in Obstetrics &Gynecology, Volume 66, Issue 1, Page 41-50, July 2025.ABSTRACT Objectives Monochorionic diamniotic (MCDA) twins with selective fetal growth restriction (sFGR) and either continuous (cAREDF) or intermittent (iAREDF) absent or reversed end‐diastolic flow in the umbilical artery face significant fetal and neonatal risks.
A. T. R. Noll +19 more
wiley +1 more source
Construction and Investigation of the Bone Quantitative Ultrasonic Detection System [PDF]
, 2003 骨作为一种主要的器官，对人体起着支撑作用，同时起到对重要脏器的保护、造血、保护脑和神经通路、承受冲击、贮存矿物质等多种重要功能。因此，保证骨的健康是维护身体健康的基础。另一方面，骨质疏松作为一种多发性公共卫生问题，正日益得到人们的广泛重视。目前，定量骨超声检测作为一种价廉、便携、操作简单、无辐射、精确度高，预测骨折具有高灵敏度的无损检测手段，在发达国家已被广泛应用于临床。 从上世纪90年代后期开始，定量骨超声检测在国内开始进入临床应用，虽然以其为基础的临床研究颇为活跃 ...
江洋
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