Results 31 to 40 of about 7,695 (169)
Zhongguo shiyan zhenduanxue, 2016 目的探讨超声联合超敏反应C蛋白（hs-CRP）、前列腺抗原（PSA）检测对前列腺增生的诊断价值。方法选取2012年1月-2014年12月间我院临床确诊的78例前列腺增生患者作为观察组,选取同时期于我院行男性健康体检人群71例作为对照组,比较两组的Hs-CRP、PSA、IPSS评分、前列腺体积、残余尿、Qmax,比较前列腺增生患者不同hs-CRP的各参数情况,比较联合检测与单一检测检出率。结果观察组患者的Hs-CRP、PSA、IPSS评分、前列腺体积、残余尿均明显大于对照组,Qmax明显小于对照组,Hs ...
尤志新
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基于多频超声波技术和GWO-BP算法的变压器油电气性能检测方法研究
Gaoya dianqi, 2020 为了实现对变压器油电气性能快速准确地检测,提出了基于多频超声波（MFU）技术和灰狼优化BP神经网络（GWO-BP）的检测方法,利用不同频率超声波在变压器油中传播速度和衰减系数不同、对不同尺寸颗粒物检测效果不同的特点,综合了超声波在无损检测上的优势以及灰狼算法全局寻优能力强、预测精度高的优点。首先利用超声波在非均匀介质中的传播特性,准确地获取超声波在变压器油中的传播速度、衰减系数等特性参数;再利用灰狼算法对传统BP神经网络进行优化。然后利用灰狼优化的神经网络对样本进行训练 ...
王旭, 生西奎, 慕锟, 王昕
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Study on a Micro-fabricated Ultrasonic knife and Its Piezoelectric Driving Power [PDF]
, 2011 超声手术刀是20世纪90年代后在生物医学领域新兴的一种手术器械，而MEMS技术在超声手术刀制造中的引入，又促使其向高精度、微体积、多功能、低成本的方向进一步发展。本文以国家863计划所支持的“基于MEMS技术的微型超声手术刀”项目课题为背景，对其薄片变幅杆刀体进行了理论推导与分析，并构建了其整体等效网络模型，最后完成了其压电驱动电源的设计与实现。论文的主要贡献与具体创新点主要如下： 1．首次对三角型与指数型复合薄片变幅杆进行了理论推导，得出了表征其特性的各种重要函数与方程 ...
武敬
core
Ultrasound in Obstetrics &Gynecology, Volume 65, Issue 3, Page 295-302, March 2025.ABSTRACT Objective Although artificial intelligence (AI) is increasingly being applied to ultrasound imaging in gynecology, efforts to synthesize the available evidence have been inadequate. The aim of this systematic review was to summarize and evaluate the literature on the role of AI applied to ultrasound imaging in benign gynecological disorders ...
F. Moro +8 more
wiley +1 more source
The Research on Neural-fuzzy Controller and it's Application in VVVF System [PDF]
, 2002 针对变频调速系统的控制问题 ,提出了神经模糊控制策略 ,并将其应用到了交流变频调速系统的实验中。结果表明 ,神经模糊控制器不仅具有令人满意的静、动态性能 ,而且具有很强的鲁棒性和自适应性。This paper presents the neural fuzzy controlling algorithm to resolve the problem in VVVF system and applies it in the test for VVVF system.Results of the ...
丁科, 李绍滋, 梁文林
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Routine 36‐week scan: diagnosis and outcome of abnormal fetal presentation
Ultrasound in Obstetrics &Gynecology, Volume 65, Issue 2, Page 154-162, February 2025.ABSTRACT Objectives First, to report the incidence of non‐cephalic presentation at a routine 36‐week ultrasound scan, the uptake and success of external cephalic version (ECV) and the incidence of spontaneous rotation from non‐cephalic to cephalic presentation.
M. Fitiri +5 more
wiley +1 more source
Research of New MFL Testing Technology Based on the Condition of Variable Excitation [PDF]
, 2016 储罐和管道是石化工业中石油和天然气的主要载体，储罐和管道的腐蚀不可避免的造成石油和燃气的泄漏，并进而引发爆炸等事故。因此，对储罐和管道的安全检测，对于保障人民生命、财产以及防止环境污染等具有重要的意义。漏磁检测技术属于无损检测范畴，是储罐和管道检测中最常用的检测手段之一。内、外表面缺陷的区分问题一直是漏磁检测技术的一个技术难题，本文提出了变励磁条件下的新型漏磁检测技术，可有效检测缺陷并实现内外表面缺陷的区分。 本文首先分析了漏磁检测技术以及无损检测技术的研究背景和现状 ...
李雪松
core
Ultrasonic velocity and acoustic emission properties of concrete eroded by sulfate and its damage mechanism [PDF]
, 2016 Simulation experiment was performed on the performance of concrete exposed to sulfate attack and dry-wet cycles. Changes in ultrasonic velocity and acoustic emission activities for concrete at different erosion periods were tested by uniaxial compression
JI Hong-guang +3 more
core +1 more source
Prediction of pre‐eclampsia using maternal hemodynamic parameters at 12 + 0 to 15 + 6 weeks
Ultrasound in Obstetrics &Gynecology, Volume 65, Issue 2, Page 173-182, February 2025.ABSTRACT Objectives To compare the maternal hemodynamic profile at 12 + 0 to 15 + 6 weeks' gestation in women who subsequently developed pre‐eclampsia (PE) and those who did not, and to assess the screening performance of maternal hemodynamic parameters for PE in combination with the Fetal Medicine Foundation (FMF) triple test, including maternal ...
X. Wang +9 more
wiley +1 more source
Gaoya dianqi, 2017 运行中局部放电测试是检测GIL设备内部是否存在缺陷的最有效手段之一。文中对GIL设备运行中超声波局部放电测试发现的异常进行了分析。依据超声波局放测试、超声波/地电波/高频电流声电联合诊断测试、现场解体检查及返厂解体检查结果进行了综合分析判断,确定了局放异常产生的原因并提出运行建议。
黄和燕 +5 more
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