Results 31 to 40 of about 512,540 (143)
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
doaj
Rare Metals, Volume 45, Issue 6, June 2026.ABSTRACT Lung cancer is one of the most common and deadly malignancies worldwide. Although immune checkpoint inhibitors, including PD‐1/PD‐L1 blockers, have benefited a subset of patients, response rates remain limited, and recurrence is frequent because of the immunosuppressive tumor microenvironment (TME), characterized by hypoxia and dysregulated ...
Yi Ma +6 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
doaj
Ultrasound in Obstetrics &Gynecology, Volume 67, Issue 6, Page 806-814, June 2026.ABSTRACT Objective To investigate the incidence of pre‐eclampsia (PE) and the predictive performance of the Fetal Medicine Foundation (FMF) first‐trimester PE screening algorithm across pregnancies conceived using assisted reproductive technology (ART), after ovulation induction (OI) and through spontaneous conception (SC).
A. S. L. Kjaer +23 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
doaj
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
doaj
Rare Metals, Volume 45, Issue 5, May 2026.ABSTRACT Environmental pollution across water, air, and soil systems poses escalating threats to human health and ecosystem stability, driven by heavy metals, persistent organic pollutants, particulate matter (PM), bioaerosols, and toxic gases. Conventional remediation technologies often suffer from limited selectivity, insufficient efficiency, and the
Junjie Qi +6 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
doaj
Aspect Ratio‐Controlled Chiral Nanostructures for Dual‐Mode Breast Cancer Theranostics
Rare Metals, Volume 45, Issue 5, May 2026.ABSTRACT Chiral CdSe/CdS quantum dots (QDs) have emerged as promising platforms for precise cancer diagnosis and therapy due to their unique optical properties and biological interactions. In this study, we systematically investigated the role of aspect ratio (AR) modulation in ultrathin‐shelled chiral CdSe/CdS dot‐in‐rods (DRs) on their performance in
Linxuan Wu +9 more
wiley +1 more source
, 1995 对细长翼摇滚的一组典型的滚转角随时间变化的实验数据进行参数辨识，并用改进的单自由度数学模型，计算其非线性滚转阻尼特性后表明，当机翼摇滚由小振幅逐渐发展为大振幅的平衡状态时，其阻尼导数始于某一正值，且随振幅的增加而减小，最后便趋于零。而非线性阻尼力矩的变化幅值，则是正比于角振幅的变化率 ...
姜俊成, 何龙德
core +2 more sources