Results 21 to 30 of about 19,769 (116)
Jianzhu Gangjiegou Jinzhan单轴对称截面轴压构件弯扭失稳的换算长细比是计算其极限荷载的重要参数。基于单轴对称截面轴压构件弯扭失稳的平衡微分方程，采用Galerkin法推导了4种边界约束条件弯扭失稳临界荷载的一元二次方程，并进一步得到了基于荷载比、双长细比的弯扭失稳换算长细比理论式。基于理论式，分别对比了我国现行标准GB 50017—2017中双角钢组合T形截面轴压构件扭转失稳、弯扭失稳的换算长细比，揭示了其中存在的问题；提出了新的双角钢组合T形截面轴压构件扭转失稳、弯扭失稳换算长细比的计算式，并与理论式的计算结果进行对比。结果表明，
刘占科 +4 more
doaj +2 more sources
The Inclusion Trade‐Off: Comparing the Design and Functionality of Collaborative Governance Forums
Policy Studies Journal, Volume 54, Issue 2, May 2026.ABSTRACT Environmental challenges require collaboration across jurisdictions, often through forums or intermediary spaces for repeated interaction. A persistent forum design question concerns inclusion criteria, or which actors should be included.
Adam Wiechman +3 more
wiley +1 more source
Jianzhu Gangjiegou Jinzhan, 2017 针对单肢C形和U形截面及由其拼合而成的双肢和四肢截面冷弯薄壁型钢柱轴压承载力,进行了66根(共6种截面,5种长度)两端铰接的多肢拼合截面冷弯薄壁型钢柱轴压试验,研究了长细比、肢数及拼合形式对冷弯薄壁型钢多肢拼合柱轴压受力性能的影响。试验结果表明:长细比小于70的开口截面易发生畸变屈曲,闭口截面则发生局部屈曲;长细比大于70的试件则以整体屈曲破坏为主;随着试件的长度增加,其轴压承载力逐渐降低。相对于单肢截面,相同高度的拼合截面长细比减小,试件破坏形式随着长细比减小而从整体屈曲控制变为畸变屈曲和局部屈曲控制,
崔瑶, 牛牧春, 杨璐
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Ultrasound in Obstetrics &Gynecology, Volume 67, Issue 4, Page 492-499, April 2026.ABSTRACT Objectives To assess the value of placental insufficiency markers for estimating the risk of genetic anomalies in fetuses with isolated early‐onset fetal growth restriction (FGR), defined as an estimated fetal weight ≤ 3rd percentile diagnosed ≤ 28 + 6 weeks' gestation.
M. Armengol‐Alsina +17 more
wiley +1 more source
Shuitu Baochi Xuebao, 2017 基于室内人工模拟降雨试验方法，选取细沟密度、细沟割裂度和细沟宽深比3个细沟形态指标，对晋西黄绵土坡面细沟形态演变特征进行分析，并探讨了降雨条件下不同坡长坡面细沟形态对产流产沙规律的影响。结果表明，晋西黄绵土坡面细沟形态演变过程为先形成跌坎，跌坎贯穿发育为细沟，再形成细沟网，最后发生细沟崩塌。细沟密度与割裂度均随坡长和雨强的增大而增大，细沟宽深比随二者的增大而减小；坡长对细沟密度和细沟宽深比的影响较雨强敏感，而降雨强度对细沟割裂度的影响更加敏感。坡面平均产流率随坡长的变化可用线性函数描述（R2＞0.95），
裴冠博, 龚冬琴, 付兴涛
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Rare Metals, Volume 45, Issue 3, March 2026.ABSTRACT Reliable operation of high‐performance magnetostrictive devices, composed of the giant magnetostrictive material (GMM), that is, the TbDyFe alloy, critically depends on an optimally tailored bias magnetic field. Sufficient intensity and uniformity are essential to induce the ideal initial strain in the GMM, enabling peak reciprocating output ...
Jinan Yu +12 more
wiley +1 more source
Zhongguo shiyan zhenduanxue, 2014 目的探讨血清对U937细胞分化成熟及细胞周期的影响。方法应用乙酸肉豆蔻佛波醇（PMA）诱导U937细胞分化,血清作为调节因素,通过倒置显微镜观察细胞的形态与贴壁情况并计算细胞贴壁率并依此作为细胞分化成熟的标志,采用流式细胞仪测定细胞周期的变化。结果 FCS+PMA组细胞贴壁生长;其他3组细胞悬浮生长;细胞周期测定结果显示,与FCS组相比,NOFCS、NOFCS+PMA和FCS+PMA组的G1期细胞明显增多,S期细胞明显减少 ...
曹林林 +3 more
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Zhongguo shiyan zhenduanxue, 2020 目的采用体外培养宫颈腺癌Hela细胞,观察莪术联合放疗对宫颈腺癌Hela细胞增殖、凋亡的影响。方法采用CCK-8法检测不同浓度莪术油注射液对Hela细胞生长的抑制作用。设立空白对照组、单药组、6Gy照射组、10Gy照射组、药物+6Gy照射组、药物+10Gy照射组,CCK-8法检测莪术油联合放疗对Hela细胞的抑制作用,流式细胞术检测莪术油联合放疗对Hela细胞凋亡的影响。结果莪术油作用后,Hela细胞生长受到抑制,且细胞抑制率与药物浓度显著相关 ...
赵悦辰 +6 more
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Rare Metals, Volume 45, Issue 3, March 2026.ABSTRACT Aqueous zinc‐ion batteries (AZIBs) hold great promise for safe and sustainable energy storage, but their commercialization is impeded by severe Zn dendrite growth and interfacial instability. To address these challenges, we propose a defect engineering strategy employing ultrafine ZnAl2O4 (ZAO) nanoparticles (∼5 nm) with oxygen vacancy defects
Yilun Ren +9 more
wiley +1 more source
野生动物学报, 2014 以麋鹿、獐、马鹿、梅花鹿、白唇鹿和狍6种鹿科动物的冬季上毛为研究对象,通过对背中部上毛长度、细度、髓质指数、鳞片长宽比、横向单位长度(200 μm)的鳞片数量等性状指标的比较结果表明:这6种鹿科动物的冬季上毛细度在300～800 μm之间,上毛长度在37～65 mm之间,髓质指数在96.2%～97.5%之间,横向单位长度(200 μm)的鳞片数量在2.5～3.8个之间,鳞片长宽比在0.2～0.6之间。其中白唇鹿的上毛细度在600 μm以上,高于其他5种动物; 马鹿的鳞片长宽比为0.5以上 ...
陈 辰 张 伟
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