Results 41 to 50 of about 18,919 (167)
Ultrasound 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
Gaoya dianqi, 2002 现代晶闸管阀的高额定容量使其难以在试验室用背靠背试验回路进行试验,用合成试验回路对晶闸管阀的设计进行验证是一种替代方法。设计合成试验回路的核心在于,如何正确地再现作用在晶闸管阀上的负荷。为此,重点描述了换流阀在4种运行状态下的电压和电流负荷。ABBPowerSystems开发了一种新的合成试验回路,正确地再现了运行中施加在HVDC晶闸管阀上的电压和电流负荷。验证试验表明,该回路的设计是成功的。
盛宝良 +4 more
doaj
Improving the wall thinning of the transition shoulder with anti-wedge upset rolling in cross wedge rolling hollow parts [PDF]
, 2016 Wall thinning occurs at transition shoulders in cross wedge rolling (CWR) hollow parts without a mandrel, which will reduce the mechanical strength of the parts, so improving the wall thickness of the shoulder must be resolved.
HU Zheng-huan +2 more
core +1 more source
Contribution of microcosm experiments to conservation science
Conservation 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
Gaoya dianqi, 2011 飞机雷击附着点试验是确定飞机雷击区域和飞机试验鉴定的主要方法,能够为飞机防雷设计提供依据,并能对雷击防护特性进行试验验证。依据航标HB 6129—1987《飞机雷电防护要求及试验方法》,对飞机的缩比模型进行雷击附着点试验。确定了飞机的雷击区域,结果与F-4的真实雷击情况基本吻合,为飞机的防雷设计提供了依据,通过对试验相关技术问题,包括试验方法、模型比例范围、放电间隙的尺寸、雷击方位和雷电放电理论等相关内容进行详细的分析和讨论,说明所采用的试验方法可行,验证了雷电放电理论 ...
温浩, 王宏
doaj
Analytical Method and Experimental Verification of Aerostatic Spindle Design Based on the Coupling Effect of Ultra-precision Grinding [PDF]
摘要:超精密内圆磨床工件轴采用空气静压支承，其在超精密内圆磨削过程中与砂轮轴间的耦合效应往往会改变空气静压主 轴的回转精度并引入新的误差，对加工过程和工件精度有重要影响。提出了一种新的建模方法来研究空气静压主轴回转的耦 合效应及对超精密磨削过程的影响。将工件轴-砂轮轴组成的磨削系统作为一个整体加工闭环系统来进行设计分析。为了科学 地解析这一过程，以开发的超精密内圆磨床为研究对象，建立空气静压主轴双转子耦合模型，评估了空气静压轴承参数和超 精密内圆磨削过程对主轴动态响应的影响。并进一步分析耦合效应在亚微米-
Bai, Q +5 more
core +1 more source
International Journal of Applied Linguistics, Volume 36, Issue 1, Page 393-408, February 2026.ABSTRACT Acknowledging the limitations of existing measurement instruments in adequately capturing the distinct cognitive processes (e.g., form‐focused vs. meaning‐focused) involved in informal digital learning of English (IDLE), this paper asserts a pressing need to develop and validate robust instruments that measure form‐focused and meaning‐focused ...
Minlin Zou +3 more
wiley +1 more source
Gaoya dianqi, 2018 断续电流试验是高压直流输电用晶闸管换流阀的一项重要的型式试验,该试验模拟换流阀在两种不同电压下电流产生断续情况,换流阀能够正常、多次可靠触发的能力。文中讨论了在合成试验回路基础上采用电流源双六脉动桥串并联运行、增加辅助取能装置或调节电压源时序的方法进行断续电流试验,并对上述几种方法进行了比较分析。经过试验验证的晶闸管换流阀在实际直流输电工程中的良好运行证明了合成试验回路断续电流试验方法上的等效性。
黄熹东, 胡治龙, 刘朴, 张长春
doaj
Adaptive zero velocity correction method for fiber optic inertial navigation system in coal mining roadheader [PDF]
The fusion positioning of high-precision fiber-optic inertial navigation and high-precision position sensor is an effective method to realize the accurate positioning of coal mine roadway roadheader.
Jianquan CHAI +5 more
core +1 more source
Yttrium Addition Co‐Enhances the Plasticity and Corrosion Resistance of TiB2‐Refined Al‐Mg‐Zn Alloys
Rare Metals, Volume 45, Issue 1, January 2026.ABSTRACT To address the degradation of corrosion resistance induced by Al‐5Ti‐B grain refiner during the strengthening of Al‐Mg‐Zn alloys, this study innovatively employed a rare earth element yttrium (Y) alloying strategy to achieve synergistic enhancement of mechanical strength and corrosion resistance.
Wen‐Tao Qin +9 more
wiley +1 more source