Results 41 to 50 of about 37,131 (190)

变压器局部放电超声定位的现场应用

Gaoya dianqi, 2005
简述了超声波定位的工作原理,通过实例分析了中性点绝缘放电故障超声定位、围屏爬电故障超声定位、套管引线放电故障超声定位、分接引线放电故障超声定位和线圈绝缘压板及端部绝缘放电超声定位,并得出超声波定位的经验和体会。
葛为民
doaj  

Research on Key Issues in Eddy Current Nondestructive Evaluation of Residual Stress in Aluminum Alloy [PDF]

, 2015
铝合金作为制造业发展的基础材料，在航空航天、高速铁路、建筑工程、船舶制造、汽车工业等支柱产业中有着重要地位。残余应力往往是造成铝合金结构破坏的重要因素。有效的评价应力状态，特别是导致损伤出现的临界应力状态是评价设备结构强度、可靠性的重要依据。传统的无损检测方法已广泛应用于工程实际中，但大部分局限于对已成型的缺陷进行检测。对于可能导致损伤出现的隐性、不规律变化的残余应力状态的评价则较为困难。 目前，应用较多的残余应力检测法主要有盲孔法、X射线法、超声波法以及磁测法。这些方法在使用上都存在很大的局限性 ...
汪涛
core  

Transvaginal ultrasound for detecting parametrial involvement in suspected deep pelvic endometriosis: updated meta‐analysis

Ultrasound in Obstetrics &Gynecology, Volume 67, Issue 1, Page 7-14, January 2026.
ABSTRACT Objective To perform an updated meta‐analysis evaluating the diagnostic performance of transvaginal ultrasound (TVS) for detecting lateral parametrial involvement in women with suspected deep pelvic endometriosis. Methods A literature search was performed in the Web of Science, PubMed and Scopus databases from January 2021 to May 2024 for ...
J. L. Alcázar, C. Montoya, C. Candau, C. Catalan, R. Orozco, M. Á. Pascual, S. Ajossa, S. Guerriero   +7 more
wiley   +1 more source

Numerical Simulation and Performance Analysis of a Scramjet Based on Three Dimensional Design [PDF]

, 2015
本文以超燃冲压发动机为研究对象，将其中的各部件置于整个发动机的大环境下进行了设计与性能分析。 以流线追踪三维Busemann型面作为进气道，研究了其不启动时的流场特征以及非设计点下的性能。随后将该进气道与隔离段模型相结合进行了数值模拟，结果表明增加隔离段长度可提升极限反压，但长度越长，反压比提升的幅度越小；进气道来流的影响使隔离段在反压作用下的流场呈现不均匀性，反压越高，不均匀性越强，进气道所受的压阻也越大。 在燃烧室设计过程中，以均匀来流为条件分别考察了边界层厚度、狭缝抽吸 ...
方骁远
core  

Endometrial assessment in abnormal uterine bleeding: transvaginal ultrasound alone may not be good enough

Ultrasound in Obstetrics &Gynecology, Volume 67, Issue 1, Page 79-88, January 2026.
ABSTRACT Objective To evaluate the proportion of optimal assessments of endometrial thickness (ET) achieved by transvaginal ultrasound (TVS) compared with a multimodal (MM) sonographic approach in women with abnormal uterine bleeding (AUB). Methods This prospective observational study was a subset of the EPI‐SURE study conducted between June and ...
S. Nijjar, S. Kastora, A. Bajrami, S. Solangon, M. Widschwendter, D. Jurkovic   +5 more
wiley   +1 more source

超声内镜和经腹超声造影对壶腹周围占位性病变的诊断价值比较

Zhongshan Daxue xuebao. Yixue kexue ban, 2018
【目的】为了比较超声内镜和经腹超声造影对壶腹周围占位性病变的诊断价值。【方法】回顾性分 析40例从2016年1月至2018年4月于我院行超声内镜和经腹超声造影检查，并手术或活检确诊为壶腹周围病 变的患者。比较超声内镜和经腹超声造影对壶腹周围占位性病变的检出率和诊断符合率。【结果】共入组患者 40例，其中壶腹部恶性病变有27例，良性病变13例。超声内镜对壶腹周围病变的检出率高于经腹超声造影检 查，分别为95.0%（38/40）和77.5%（31/40），差异有统计学意义（P=0.048 ...
陈瑜君, 梁美娟, 蓝文通, 梁瑾瑜, 谢晓燕   +4 more
doaj  

Undetected cases after implementation of first‐trimester anomaly scan in low‐risk population: insights from the IMITAS study

Ultrasound in Obstetrics &Gynecology, Volume 67, Issue 1, Page 27-33, January 2026.
ABSTRACT Objective To assess the effectiveness of the first‐trimester anomaly scan (FTAS) performed as part of a centrally steered national screening program in The Netherlands by investigating false‐negative cases with a fetal structural anomaly that was not detected at the FTAS.
K. Bronsgeest, E. E. R. Lust, S. C. E. Zaaijer, L. Henneman, N. Crombag, C. M. Bilardo, R.‐J. H. Galjaard, E. Sikkel, A. K. K. Teunissen, M. N. Bekker, M. C. Haak, Collaborators, A. B. C. Coumans, A. Elvan‐Taşpınar, S. Galjaard, A. T. J. I. Go, E. van Leeuwen, G. T. R. Manten, E. Pajkrt   +18 more
wiley   +1 more source

浅谈妇产科超声实践教学

Zhongguo shiyan zhenduanxue, 2018
超声检查技术以其无创性,操作方便、简单而又适时的特点一直是妇产科疾病检查方法的首选。随着妇产科超声检查在临床工作中的广泛应用以及妇产科超声新诊疗技术的深入开展,不仅对妇产科超声医师有了更高的要求,而且未来的其他系统的超声科医师也需要掌握一定的妇产科超声影像知识。因此,妇产科超声的教学工作显得尤其重要。但是现在超声诊断学本身课时设置就少,理论课上基本涉及不到妇产科相关的超声内容 ...
曹璐, 冷维春, 刘俊宝, 秦瑞
doaj  

Performance of non‐invasive prenatal testing in vanishing‐twin and multiple pregnancies: results of TRIDENT‐2 study

Ultrasound in Obstetrics &Gynecology, Volume 66, Issue 6, Page 738-746, December 2025.
ABSTRACT Objective To evaluate the performance of non‐invasive prenatal testing (NIPT) in vanishing‐twin and multiple pregnancies. Methods This study was conducted as part of the TRIDENT‐2 study, in which NIPT was offered as a first‐tier screening test to women with a multiple pregnancy or vanishing‐twin pregnancy between 1 June 2020 and 31 March 2023 ...
J. C. A. van Eekhout, C. J. Bax, L. van Prooyen Schuurman, E. C. Becking, A. J. E. M. van der Ven, D. Van Opstal, E. M. J. Boon, M. V. E. Macville, M. N. Bekker, R. J. H. Galjaard, on behalf of the Dutch NIPT Consortium, E.A. Sistermans, L. Henneman, A. Polstra, E. Voorhoeve, S.L. Zelderen‐Bhola, E.M.J. Boon, M.P.R. Lombardi, M.C. Bakker, E.J. Bradley, E.M.J. Boon, C. Louwerens‐Zintel, M. Smit, M.C. van Maarle, M.B. Tan‐Sindhunata, K. van der Meij, H. Meij, C.J. Bax, E. Pajkrt, I.H. Linskens, L. Martin, J.T. Gitsels‐van der Wal, R. J. H. Galjaard, D. van Opstal, M.I. Srebniak, F.M. Sarquis Jehee, I.H.I.M. Hollink, F. Sleutels, W. de Valk, W.H. Deelen, A.M.S. Joosten, K.E.M. Diderich, M.E. Redeker, A.T.J.I. Go, M.F.C.M. Knapen, S. Galjaard, A.K.E. Prinsen, A.P.G. Braat, M.J.V. Hoffer, N.S. den Hollander, E.J.T. Verweij, M.C. Haak, M.V.E. Macville, S.J.C. Stevens, A. van der Wijngaard, L.H. Houben, M.A.A. van Esch‐Lennarts, L. Hamers, A.G.P. Jetten, S.A.I. Ghesquiere, B. de Koning, M. Zamani Esteki, C.J. Heesterbeek, C.E.M. de Die‐Smulders, H. Brunner, M.J. Pieters, A.B.C. Coumans, D.F.C.M. Smeets, B.H.W. Faas, D. Westra, M.M. Weiss, I. Derks‐Prinsen, I. Feenstra, M. van Rij, E. Sikkel, R.F. Suijkerbuijk, B. Sikkema‐Raddatz, I.M. van Langen, K. Bouman, L.K. Duin, G.H. Schuring‐Blom, K.D. Lichtenbelt, M.N. Bekker, E. van Vliet‐Lachotzki, J. Pot, A. J. E. M. van der Ven, S van 't Padje   +86 more
wiley   +1 more source

经直肠高频彩色多普勒超声诊断直肠肛管周围脓肿的研究

Zhongguo shiyan zhenduanxue, 2010
目的探讨经直肠高频彩色多普勒超声诊断直肠肛管周围脓肿的声像图特点及术前定位的临床应用价值。方法应用7-10 MHz的高频双平面探头,对88例直肠肛周脓肿患者进行经直肠彩色多普勒超声（简称腔内超声）检查,并应用常规腹部3.5 MHz探头在体表肛门周围超声（简称肛周超声）,观察声像图特征,分析对比这两种超声方法对肛周脓肿的诊断、内口判断的准确性。结果本组病人腔内超声与肛周超声对脓肿是否形成及脓肿内口的判定均有显著性差异 ...
辛明志, 刘海丽, 王钟焰
doaj