Results 21 to 30 of about 8,954 (113)
Routine 36‐week scan: diagnosis and outcome of abnormal fetal presentation
Ultrasound in Obstetrics &Gynecology, Volume 65, Issue 2, Page 154-162, February 2025.ABSTRACT Objectives First, to report the incidence of non‐cephalic presentation at a routine 36‐week ultrasound scan, the uptake and success of external cephalic version (ECV) and the incidence of spontaneous rotation from non‐cephalic to cephalic presentation.
M. Fitiri +5 more
wiley +1 more source
Zhongguo shiyan zhenduanxue, 2015 目的选择舒芬太尼和曲马多为研究药物,采用响应曲面分析法探讨阿片类一非阿片类镇痛药对术后伤口疼痛性刺激的药效学相互作用。方法选择ASAI-II级、年龄20-60岁手术患者70例,随机设定舒芬太尼浓度(0-1.8μg/ml,梯度间隔为0.2μg/ml),同时分别联合不同浓度曲马多(0-6.4mg/ml,梯度间隔为0.8mg/ml)。术终患者清醒后,以5ml/h持续泵注不同浓度镇痛药,1h后观察患者静息下及体动下视觉模拟评分(visual analogue scale,VAS ...
刘鹏飞, 关雷
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Jianzhu Gangjiegou Jinzhan, 2023 拼合式带翼缘冷弯薄壁型钢十字形构件在轴心压力作用下的主要破坏形式是扭转失稳，其扭转失稳承载力取决于抗扭刚度，而拼合效应对于构件抗扭刚度的影响没有明确的计算方法。为研究拼合式带翼缘十字形构件的抗扭性能及拼合效应对抗扭刚度的影响，对十根不同截面尺寸和拼合螺栓分布的带翼缘十字形冷弯薄壁构件进行了扭转试验，得到扭转全过程下的扭矩-转角曲线和扭矩-应变曲线。设计了专用加载装置使构件在加载初期先发生自由扭转，据此得到该拼合构件的自由扭转刚度。试验结果表明：减小螺栓间距能增强拼合效应，对于单列螺栓构件 ...
白清夫, 宋振森, 缪其亮
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Prediction of pre‐eclampsia using maternal hemodynamic parameters at 12 + 0 to 15 + 6 weeks
Ultrasound in Obstetrics &Gynecology, Volume 65, Issue 2, Page 173-182, February 2025.ABSTRACT Objectives To compare the maternal hemodynamic profile at 12 + 0 to 15 + 6 weeks' gestation in women who subsequently developed pre‐eclampsia (PE) and those who did not, and to assess the screening performance of maternal hemodynamic parameters for PE in combination with the Fetal Medicine Foundation (FMF) triple test, including maternal ...
X. Wang +9 more
wiley +1 more source
People and Nature, Volume 6, Issue 6, Page 2431-2448, December 2024.Abstract How humans connect with nature impacts the well‐being of both people and ecosystems. Being disconnected from nature can lead to attitudes and behaviours that ultimately damage our physical and mental health and cause irreparable harm to the planet.
Xuanyi Wang, Shulin Chen
wiley +1 more source
Jianzhu Gangjiegou Jinzhan, 2010 畸变屈曲是冷弯薄壁卷边槽钢截面的一种主要屈曲模式,分析时应考虑截面板组间的相关作用,腹板提供给翼缘的约束作用是影响构件畸变屈曲性能的主要因素。腹板开孔后将导致应力的重分布,影响板件间的相关作用。本文在分析的过程中,以无孔构件的畸变屈曲理论为基础,应用ANSYS有限元软件对腹板开孔的冷弯薄壁卷边槽钢构件在轴心受压情况下的畸变屈曲性能进行了分析研究。讨论了孔洞横向间距、纵向间距、孔宽、孔型等参数对畸变屈曲性能的影响。除此之外,还分析了截面板件尺寸大小对截面畸变屈曲性能的影响。最后,根据有限元参数分析结果 ...
郑敦, 余绍锋
doaj
Ultrasound in Obstetrics &Gynecology, Volume 64, Issue 1, Page 36-43, July 2024.ABSTRACT Objective Although remarkable strides have been made in fetal medicine and the prenatal diagnosis of congenital heart disease, around 60% of newborns with isolated coarctation of the aorta (CoA) are not identified prior to birth. The prenatal detection of CoA has been shown to have a notable impact on survival rates of affected infants.
C. A. Taksøe‐Vester +8 more
wiley +1 more source
Gongye shui chuli, 2018 基于微生物固定化技术制备SRB固定化颗粒，用其处理煤矿酸性废水。在单因素实验基础上，采用响应曲面法优化了SRB固定化颗粒基质中的铁屑种类和配比。结果表明，固定化颗粒的最佳铁屑种类为生铁屑，在PVA、海藻酸钠、麦饭石、玉米芯质量分别为0.9、0.05、0.3、0.5 g的条件下，最佳铁屑投加量为0.6 g，铁屑粒径为0.05~0.075 mm。在此条件下制备的固定化颗粒对废水的实际SO42-去除率为82.17%（预测值为83.414%）。响应曲面方差分析结果表明，所得回归模型拟合效果较好 ...
安文博 +4 more
doaj +2 more sources
Zhongguo shiyan zhenduanxue, 2015 目的应用响应曲面分析法建立最佳的舒芬太尼复合氟比洛芬酯静脉术后镇痛模型,获得满意的镇痛效果,降低副作用的发生。方法选择ASAI-II级的肿瘤患者,年龄18-70岁,行胸腹部手术70例,随机分为对照组和实验组。对照组术后给予静脉镇痛泵舒芬太尼200μg+氟比洛芬酯150mg+生理盐水到250ml,实验组通过建立舒芬太尼与氟比洛芬酯相互作用响应曲面模型,获得理想的药物配置浓度,与常规配比方案进行效果和副作用发生率的比较。结果通过应用响应曲面分析法获得的舒芬太尼复合凯纷镇痛浓度方案 ...
刘文涛, 关雷
doaj
Jianzhu Gangjiegou Jinzhan, 2023 为研究考虑型钢初应力的活性粉末混凝土（RPC）包钢组合柱的轴压性能，完成了4根H形截面柱和1根方形截面柱的轴压静载试验。讨论了各参数对组合柱破坏形态、荷载-应变曲线、荷载-位移曲线、承载力和延性的影响。试验结果表明：所有试件RPC应变滞后均消除，RPC和型钢具有良好的共同工作性能。H形截面柱失效模式表现为RPC横向受拉断裂，而方形截面柱表现为腹板RPC剪压破坏。型钢翼缘增厚3 mm后，试件开裂位移提升了8.55%，承载力增大了3.54%，延性增大了1.8%。初应力比增大对试件承载力的影响不大 ...
卜良桃, 刘娟
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