Results 31 to 40 of about 5,513 (121)
Ultrasound in Obstetrics &Gynecology, Volume 66, Issue 2, Page 135-146, August 2025.ABSTRACT Objective To derive pooled estimates of maternal, fetal and pediatric outcomes up to the age of 30 months in patients undergoing pre‐ or postnatal surgery for open spina bifida (OSB). Methods A systematic search was conducted in MEDLINE, PubMed (non‐MEDLINE records), Embase, Web of Science, ClinicalTrials.gov, Cochrane Central Register of ...
Y. Kunpalin +10 more
wiley +1 more source
Dianci bileiqi, 2018 采用刚体直杆模型,计算绝缘子串风偏角,分别研究了水平档距、垂直档距、风速、风向、风压不均匀系数、地形以及加重锤等主要因素对绝缘子风偏特性的影响程度。研究结果表明:水平档距与绝缘子串风偏角呈正相关,垂直档距与绝缘子风偏角呈负相关;在风速一定的情况下,风向的主要影响区间在垂直于线路约±60°区间内。
唐子峰, 廖志雄, 袁翔
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Wildlife Letters, Volume 3, Issue 2, Page 73-83, June 2025.Blue sheep in Dhorpatan Hunting Reserve prefer alpine grasslands at 3800–4200 m on south‐facing slopes near water resources, favoring areas with low tree cover and dense ground cover, particularly rhododendrons, junipers, and Cyperaceae grasses. Their habitat significantly overlaps with livestock.
Amit Adhikari +4 more
wiley +1 more source
Gaoya dianqi, 2019 为研究特高压输电线路的风偏机理,文中以1 000kV南荆Ⅰ线风偏闪络事故为基础,开展故障点的风偏分析。采用规范给定的刚性直棒法进行验算,在风压不均匀系数取0.61和0.75的情况下,计算结果均小于发生事故的阈值。在已有研究基础上确定了分裂导线的阻力系数取值;同时进行了风洞试验,确定了绝缘子串的阻力系数。在Ansys建立导线—绝缘子有限元模型,通过谐波叠加法模拟得到风速时程,在此基础上,进行事故线路导线风偏的动态计算,得到了设计风速下的风偏角大小。结果表明,脉动效应对计算结果的放大作用不可忽略 ...
吕中宾, 白航, 杨晓辉, 楼文娟
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Politics &Policy, Volume 53, Issue 3, June 2025.ABSTRACT Climate change is increasing pressure on policymakers and the public to face perceived trade‐offs between economic growth and environmental sustainability, but is it possible to fulfill human needs within the ecological limits of the planet? This article investigates how the public prioritizes this trade‐off. We analyze the drivers of citizens'
Soomin Oh, David Hudson, Jennifer Hudson
wiley +1 more source
Dianci bileiqi, 2022 针对近期某省内发生的一起在复杂山地地形下的220 kV输电线路闪络放电故障，结合现场实际数据对故障的情况进行分析。首先依据现场实际地形、杆塔和气象数据，采用未考虑地形风速影响的传统设计计算方法得到线路故障段风偏位移，所得风偏后的放电间距满足导线设计安全距离要求；而后利用自主研发的Transpert输电线路专家系统中的高程数据建立现场实际复杂山地地形的三维模型，通过ANSYS有限元风场仿真得到故障点风速分布，并计算得到地形风速加速影响后的输电线路风偏角，发现考虑山地风速加速后的风偏放电间距小于安全距离 ...
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Ultrasound in Obstetrics &Gynecology, Volume 65, Issue 5, Page 552-559, May 2025.ABSTRACT Objective To critically review the literature and synthesize evidence on the incremental yield of prenatal exome sequencing (PES) in fetuses with an apparently normal phenotype with a normal G‐banded karyotype or chromosomal microarray (CMA).
A. Sotiriadis +5 more
wiley +1 more source
±1100 kV昌吉换流站与±800 kV天山换流站共同作用的直流偏磁问题研究
Gaoya dianqi, 2020 针对±800 kV天山—中洲特高压直流输电工程和±1 100 kV昌吉—古泉特高压直流输电工程同时以单极大地方式运行时,新疆电网内厂站面临的变压器直流偏磁风险,提出了研究方法和应对策略:首先,利用电磁测深对两接地极周边土壤进行了冬夏两季实测,在实测的土壤电阻率基础上构建了两接地极同时作用下的电网直流电流分布模型;其次,对新疆电网直流偏磁风险进行仿真计算分析,发现不同季节土壤电阻率不同,且冬季直流偏磁风险较大,两双接地极同时注入直流时,原本没有直流偏磁风险的厂站也会存在风险;最后 ...
孙冰 +5 more
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Ultrasound in Obstetrics &Gynecology, Volume 65, Issue 3, Page 295-302, March 2025.ABSTRACT Objective Although artificial intelligence (AI) is increasingly being applied to ultrasound imaging in gynecology, efforts to synthesize the available evidence have been inadequate. The aim of this systematic review was to summarize and evaluate the literature on the role of AI applied to ultrasound imaging in benign gynecological disorders ...
F. Moro +8 more
wiley +1 more source
Zhejiang Daxue xuebao. Lixue ban, 2005 通过分析太阳黑子、赤道平流层纬向风与西北太平洋上热带气旋的关系发现，赤道平流层纬向风的准两年振荡与西北太平洋上热带气旋确实具有很好的关系，这种关系受到太阳活动的调控.当太阳黑子为小年时，在赤道纬向风的西风年，西北太平洋上生成的热带气旋较多，强度偏弱；东风年，气旋较少，强度较强.在太阳黑子大年，与小年的情况相反，东风年时热带气旋较多，强度较弱；西风年，气旋较少，强度较强.
TIANRong-xiang(田荣湘)
doaj +1 more source