Results 21 to 30 of about 18,001 (167)

Research on Methods of Modeling and Fault Diagnosis for Micro Direct-Current Motors [PDF]

open access: yes, 2015
直流微电机以体积小、重量轻、便于控制等优点被广泛应用于生产消费领域,在微型精密仪器中尤为重要。为了保证产品出厂品质,生产过程必须对直流微电机进行100%检测。目前检测主要依靠人工的经验来判断电机的好坏,其工作量大,生产效率低,漏检现象严重,导致电机出厂质量不稳定。因此有必要寻找一种简便和可靠的直流微电机在生产线上的故障检测技术。该技术即可以对出厂前的直流微电机进行自动在线检测,以保证直流微电机的出厂合格率;又可以推广应用于其他永磁直流电机的故障检测与诊断。 通过分析空载下直流电机的动态数学模型 ...
谢志平
core  

Study on accurate detection of grain moisture in granary based on radio frequency principle [PDF]

open access: yes, 2019
Based on the linear correlation between grain moisture content and radio frequency(RF) signal,a new granary detection device was developed.A new RF detection circuit was designed to redesign the detection structure.Through the special detection circuit ...
CHEN Zhong-xu   +3 more
core   +1 more source

Deep Learning–Driven Surface‐Enhanced Raman Scattering–Lateral Flow Immunoassay With Au Nanostars for High‐Accuracy Respiratory Virus Detection

open access: yesRare Metals, Volume 45, Issue 2, February 2026.
ABSTRACT The high accuracy in surface‐enhanced Raman scattering‐lateral flow immunoassays (SERS–LFIAs) is critical for reliable point‐of‐care testing (POCT) in clinical diagnostics. Conventional approaches are often affected by sampling variability and uneven distribution of immunoprobes, leading to unreliable signal fluctuations.
Shuai Zhao   +9 more
wiley   +1 more source

移动式在线监测与负荷监测相结合在GIS故障检测中的应用

open access: yesGaoya dianqi, 2015
主要介绍一起移动式在线监测及局放定位在GIS故障检测中的成功应用案例。针对佛山局某220 k V变电站110 k V GIS常规红外检测出现异常的情况,采用移动式局放在线监测系统,结合GIS母线负荷监测技术发现GIS内部缺陷。解体发现该GIS 2号气室第2个连接触头等位线断线,此处支柱绝缘子螺丝松动,支柱绝缘子存在放电痕迹。说明了移动式在线监测方法结合母线负荷监测技术在GIS故障检测中的可行性,值得推广使用。
邱太洪   +5 more
doaj  

Explore the Raman instruments and methods for high sensitivity, on-line detection and miniaturization [PDF]

open access: yes, 2015
仪器是自然科学研究的重要工具,是科学研究的基础条件。科学技术的飞 速发展对仪器提出了越来越高的要求,不断的有新技术,新材料被用于科学仪 器的研发。反过来,科学仪器的发展水平也决定了科学研究的水平。“工欲善其 事,必先利其器”,仪器方法的研究本身也是一个重要的科学门类。它的特点和 难点在于要用多学科的技术来解决某一学科的尖端难题。目前,我们国家大部 分高档科学仪器依赖进口,而某些研究需要对仪器进行改装或自主搭建则困难 重重,一方面仪器厂商定制仪器价格十分高昂,而且定制仪器需要反复修改, 一般企业很难做到 ...
汪安
core  

Comparison of ultrasound with computed tomography and whole‐body diffusion‐weighted MRI in prediction of surgical outcome using ESMO‐ESGO criteria in patients with tubo‐ovarian carcinoma: prospective ISAAC study

open access: yesUltrasound in Obstetrics &Gynecology, Volume 67, Issue 2, Page 207-219, February 2026.
ABSTRACT Objective To test the non‐inferiority of extended abdominopelvic ultrasound examination compared with contrast‐enhanced computed tomography (CT) and whole‐body diffusion‐weighted magnetic resonance imaging (WB‐DWI/MRI) in discriminating preoperatively between resectable and non‐resectable disease based on the European Society for Medical ...
D. Fischerova   +26 more
wiley   +1 more source

绝缘子检测方法的现状与发展

open access: yesDianci bileiqi, 2006
经济、准确地检测绝缘子的方法对于保证输电线路的安全运行具有重要的意义。介绍了目前检测绝缘子几种常用检测方法,综合评价了电场测量法、泄漏电流法、超声波检测法、红外测温法等优缺点。随着对输电线路安全的日益重视,综合输电线路实时在线检测系统是绝缘子检测技术的主流发展趋势。现有在线检测系统能否普遍应用的主要障碍是线路杆塔的数量巨大。指出要实现真正意义上的绝缘子在线检测,应统一规范接口,严格制定免维护质量标准,选取合适的特征量,降低装置的复杂度,选择合理的信号远程传输方式。
朱虎, 李卫国, 林冶
doaj  

Study on the On-line Photochemical Derivatization-Fluorescence Determination in HPLC and the Mechanism Investigation [PDF]

open access: yes, 2010
光化学衍生(photochemicalderivatization,PCD)分析法是基于光化学反应而建立的一类分析方法。它以其独特的衍生方式与传统的荧光、化学发光、紫外-可见、电化学等检测方法相结合,提高了原有方法的灵敏度与选择性,极大地拓展了传统检测方法的应用范围,在药物、复杂生物样品、环境样品分析测定等方面得到广泛应用。然而,已报道的光化学衍生方法中的光化学衍生装置比较简易,难于满足液相色谱柱后在线衍生对多种组分同时测定的需要;另一方面,大多分析工作者主要是从“表面”去优化光化学衍生的条件 ...
温裕云
core  

Contribution of microcosm experiments to conservation science

open access: yesConservation Biology, Volume 40, Issue 1, February 2026.
Abstract Microcosms, or miniature experimental systems, have been used to develop models and theories in ecology. However, their contribution to conservation science is unclear. We explored the application, design, and impact of microcosms in conservation science from 469 systematically identified articles published from 1986 to 2023.
Eleanor R. Stern   +3 more
wiley   +1 more source

Numerical Simulation And Experiment Study On Magnetoacoustic Emission with Magnetic Induction [PDF]

open access: yes, 2015
铝合金板材具有高强度、低密度、强耐腐蚀、高断裂韧性和良好的高低温特性等优点,是制造宇宙飞船、运载火箭、飞机、舰船、坦克、装甲车和高速列车的主要材料。然而,由于加工工艺限制,铝合金板材在生产过程中不可避免地存在分层、夹杂、裂纹和氧化膜等缺陷。无损检测技术是一种在不破坏待测物材质与性能前提下实现构件质量检测的技术,目前已在许多领域成为确保产品质量和可靠性的强制性措施。 本文研究的感应式磁声发射无损检测方法是利用线圈在导体感应出的涡流在静态磁场的作用下会受到洛仑兹力的作用使导体发生机械振动,进而产生磁声信号 ...
李超
core  

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