Results 61 to 70 of about 31,418 (134)
Zhongguo shiyan zhenduanxue, 2005 目的探讨胆总管囊状扩张诊断方面的特点,深入对本病的认识。方法对65例胆总管囊状扩张患者临床表现和超声影像资料的总结分析。结果在65例病例中,腹痛、黄疽、呕吐出现率最高。具有“三联征”的患者比例为20%（未成年组）和40%（成年组）。出现“二联征”患者比例约为1/3。超声表现分为5种类型:A、B二型胆总管扩张程度较轻,占56.9%;C、D二型胆总管扩张程度较重,占43.1%;E型合并肝内胆管囊状扩张,占15.4%;在成年组中,C、D二型的比例较高。C、D二型中,出现黄疸的比例较高 ...
杨松青, 周敏颖, 赵丽荣
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Gaoya dianqi, 2022 输变电设备运行状态评估是电网企业技术管理的重要内容，针对目前电力变压器健康状态评估模型中存在的对状态量单一赋权不合理、实现步骤较为繁琐、算法性能不稳定等问题，文中采用加权秩和比WRSR(weighted rank sum ratio)模型对电力变压器健康状态进行评估，该模型原理简单，易于实现。通过选取电力变压器运行中典型状态量，采用组合赋权的理论对各状态量赋予权值大小，进而计算评估对象的加权秩和比。利用加权秩和比确定待评估对象的概率单位，并将概率单位作为自变量代入回归方程中得到状态评估结果 ...
咸日常 +5 more
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Rare Metals, Volume 45, Issue 7, July 2026.ABSTRACT Bimodal grain structure (BGS) demonstrates significant potential in synergistically optimizing the strength and plasticity of magnesium alloys. Acquiring the desired BGS consequently became a critical challenge. This study took the Mg‐9Gd‐1Zn‐0.5Zr (wt%, VZ91K) alloy as its subject. From the perspective of BGS formation mechanisms, it suggests
Shuai Yuan +5 more
wiley +1 more source
Gongye shui chuli, 2010 介绍了钢铁企业废水水质的特性,主要对邯钢外排水的现状及处理工艺进行了分析。并针对邯钢目前外排水的处理现状提出了工艺的改进建议及措施。
张振海, 常静, 黎蓓
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Rare Metals, Volume 45, Issue 7, July 2026.ABSTRACT Fe‐Cr‐Ni‐Cu alloy has been extensively utilized over the past few decades due to its low cost yet high strength. Nevertheless, the poor ductility of this alloy limits its real application in industrial fields. In this study, a soft Fe‐Cr‐Ni alloy was combined with a Fe‐Cr‐Ni‐Cu alloy by laser‐directed energy deposition (LDED) to fabricate the ...
Jiuxing Tang +9 more
wiley +1 more source
Zhongguo shiyan zhenduanxue, 2015 有报道高达30%的纵隔占位为囊性肿物,其中40%为支气管源性或食道源性囊肿[1]。纵隔囊肿患者多数无明显症状,仅在体检时发现,但仍有一部分表现为胸痛、气促、发热、咯血、心律失常等症状。如出现上述症状则需及时诊治。现将2例超声支气管镜引导下经支气管针吸活检（EBUSTBNA）诊断纵隔囊肿合并感染的病例报道如下。1临床资料病例1:患者女性,59岁 ...
赵尔为, 谭平, 黄海东
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Rare Metals, Volume 45, Issue 7, July 2026.ABSTRACT Laser powder bed fusion (LPBF) of Inconel 718 alloy inevitably introduces pronounced microstructural anisotropy, typified by columnar grains and robust crystallographic texture. This results in direction‐dependent fatigue behavior, raising critical reliability concerns for high‐stakes aerospace applications.
Zhifang Shi +9 more
wiley +1 more source
Gaoya dianqi, 2011 介绍了750 kV CVT中间变压器现场介损试验的现场测试情况,分析了试验数据超标的原因及按照规程中规定的介损标准进行设备绝缘状态判定的难度,并提出了下一步如何在现场进行交接试验判断CVT电磁单元绝缘状况的建议。
毛琛琳, 张四江, 谭彦民
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Rare Metals, Volume 45, Issue 7, July 2026.ABSTRACT High‐strength aluminum (Al) alloys are usually unprintable by laser powder bed fusion (LPBF) due to the severe hot cracking along the columnar grains. Doping elements scandium (Sc) and/or zirconium (Zr) is an effective way to eliminate hot cracks by refining the grain size to nearly nanoscale levels.
Zehuan Zhang +15 more
wiley +1 more source
Zhongguo shiyan zhenduanxue, 2018 1病例资料男,61岁,因渐进性咳嗽、气短5年,加重半个月入院。患者于入院前5年间断出现咳嗽、咳痰,活动后气短,未规律诊治,上述症状时逐渐加重。半个月前患者着凉后出现上述症状加重,咳嗽、咳痰较前频繁,轻微活动后出现呼吸困难,于外院行胸部CT发现双肺间质性改变 ...
张曦月 +4 more
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