Results 101 to 110 of about 89,101 (151)

[Challenges and clinical strategies for endodontic microsurgery in the posterior maxillary region]. [PDF]

Hua Xi Kou Qiang Yi Xue Za Zhi
Zhang C, Huang X, Hou B.
europepmc   +1 more source

[Development of a nomogram prediction model for re-tear after arthroscopic repair of massive rotator cuff tears]. [PDF]

Zhongguo Xiu Fu Chong Jian Wai Ke Za Zhi
Yang Z, Ruan W, Pan W, Li D, Yu Y, Zhao L.   +5 more
europepmc   +1 more source

[Construction and validation of a nomogram-based prediction model for the risk of intractable recurrence in patients with episodic vestibular syndrome: a study based on clinical characteristics]. [PDF]

Lin Chuang Er Bi Yan Hou Tou Jing Wai Ke Za Zhi
Dai Q, Chen Q, Huang L, Shi F, Liu S, Zheng H.   +5 more
europepmc   +1 more source

[Development and validation of an explainable machine learning-based model for predicting mortality risk in polytrauma patients]. [PDF]

Sheng Wu Yi Xue Gong Cheng Xue Za Zhi
Jiang Y, Mao J, Li L, Liang C, Kang H, Jia Z, Liu X, Zhang Z.   +7 more
europepmc   +1 more source

流沙地砾级沙粒胶结体基本特征及抗风蚀效益的风洞模拟

, 2015
在塔克拉玛干沙漠腹地的部分垄间平沙地中，天然分布有一种特殊物质——砾石级沙粒胶结体（gravel-size sand cemented bodies，缩写为GSSCD）。本文以GSSCD为材料，进行了实验研究，主要结论如下： （1）其与地表的粗砂和极粗砂呈复区分布，共同构成了覆盖沙面的大颗粒层。实地调查和取样分析表明，砂粒胶结体直径大小不一，能达到粗砂级、极粗砂级和砾石级（细粒和中砾），最大可达23.5 mm；颗粒形状不规则，质地较硬，手捏不碎；比重为2.51g/cm3，略小于砾石和当地沙丘砂 ...
孙娜
core  

[Detection Status and Cost Analysis of Community Pulmonary Nodule Screening 
with Mobile LDCT Combined with AI]. [PDF]

Zhongguo Fei Ai Za Zhi
Wang J, Tao J, Zhou M, Wang X, Wu G, Zhang Z, Lu Z, Lin Q, Wang T, Zhang H, Zheng Z, Li Y.   +11 more
europepmc   +1 more source

35 kV线路单相间歇接地故障引发线路跳闸的原因分析

Dianci bileiqi
针对35 kV线路的单相接地故障扩大为同杆塔两相或三相接地故障问题，分析了35 kV线路单相间歇接地故障的发生、影响及绝缘子串最大风偏摇摆角的安全漏洞。结果表明，当35 kV线路单相绝缘子串间歇接地故障的接地分布电容电流续流不能自熄时，线路将发生单相持续间歇接地故障及非故障两相持续间歇过电压。其中，持续间歇接地故障电流电弧作为电弧源，将对故障点导线或故障绝缘子串及同杆塔非故障相绝缘子串产生影响，甚至有可能导致非故障相绝缘子串闪络线路跳闸；持续间歇过电压将对各种电气设备（包括绝缘子串 ...
郑江, 林苗
doaj  

[Environmental relative humidity, frailty, and risk of incident stroke among middle-aged and older adults in China: A prospective cohort study]. [PDF]

Zhong Nan Da Xue Xue Bao Yi Xue Ban
Zhou Y, Zhang M, Ding H, Zheng J, Yang Y, Cui Y.   +5 more
europepmc   +1 more source

黄河三角洲城市景观生态风险测度及影响因素

Shuitu Baochi Xuebao
目的黄河三角洲作为典型生态脆弱区，其景观生态风险受多重因素影响，表现尤为突出。系统认知景观风险不仅是优化景观格局的基础，更是有效应对生态风险的关键。方法以黄河三角洲典型城市东营市为研究区，构建生态系统服务价值和“胁迫度-脆弱度-韧性”的景观生态受损概率评估框架。采用ESDA和地理探测器模型，从网格尺度探究城市景观生态风险的空间异质性及影响因素。结果1) 东营市景观生态风险平均值为0.15，呈北部东部高、中偏西南低的空间格局。生态系统服务价值约为3 175.99亿元，低于当年GDP ...
李建春, 周晓雨, 李慧琳, 王玉婷, 袁文华   +4 more
doaj  

[Association between umbilical cord blood proteome and early infant neurodevelopmental risk]. [PDF]

Beijing Da Xue Xue Bao Yi Xue Ban
Mo J, Wang H, Liu J, Li Q, Su T, Ji Y.
europepmc   +1 more source