Results 41 to 50 of about 1,535,241 (163)

Evading Strength–Ductility Trade‐Off in Titanium Matrix Composites via High‐Critical Resolved Shear Stress Dislocation Promotion and Grain Subdivision

open access: yesRare Metals, Volume 45, Issue 6, June 2026.
ABSTRACT The strength and ductility trade‐off in titanium matrix composites (TMCs) is a critical factor limiting their widespread application. In this study, a (TiB + TiC)/Ti–6Al–4V composite with an optimal balance between strength and ductility was engineered via multi‐directional forging.
Chunyu Shen   +8 more
wiley   +1 more source

光轴平行性标定系统及标定方法

open access: yes, 2012
本发明涉及一种光轴平行性标定系统及标定方法,光轴平行性标定系统包括自准直经纬仪、数据处理计算机以及用于对自准直经纬仪进行自准的平面反射镜;待测光学系统设置在自准直经纬仪的出射光路上并与数据处理计算机电性相连。本发明提供了一种测试精度高 ...
周艳   +5 more
core  

Predictive performance of Fetal Medicine Foundation first‐trimester screening algorithm for pre‐eclampsia according to conception mode

open access: yesUltrasound in Obstetrics &Gynecology, Volume 67, Issue 6, Page 806-814, June 2026.
ABSTRACT Objective To investigate the incidence of pre‐eclampsia (PE) and the predictive performance of the Fetal Medicine Foundation (FMF) first‐trimester PE screening algorithm across pregnancies conceived using assisted reproductive technology (ART), after ovulation induction (OI) and through spontaneous conception (SC).
A. S. L. Kjaer   +23 more
wiley   +1 more source

一种基于模拟驾驶平台的心理和行为监测系统

open access: yes, 2008
本发明公开了一种基于模拟驾驶平台的心理和行为监测系统,包括模拟驾驶子系统,次要任务实验子系统以及驾驶员生理数据采集子系统;其中,模拟驾驶子系统包括模拟驾驶设备和情景模拟与数据采集平台,情景模拟与数据采集平台还包括驾驶情景模拟模块和实验数据记录模块;次要任务实验子系统用于使驾驶员完成次要任务,并对驾驶员的次要任务绩效数据进行记录和分析;驾驶员生理数据采集子系统用于采集驾驶员的生理数据,它包括心电数据采集模块、体动数据采集模块和呼吸数据采集模块。本发明有利于对驾驶员的驾驶状态进行监控 ...
杨荣, 张侃, 孙向红, 郝学芹
core  

人附睾蛋白4(HE4)在泌尿系统移行细胞癌中的表达

open access: yesZhongguo shiyan zhenduanxue, 2012
目的检测人附睾蛋白4(HE4)在移行细胞癌中的水平,推测其与移行细胞癌肿瘤学特征的关联性。方法我们选择45例移行细胞癌患者,20例良性泌尿系统疾病患者,10例健康者。观察病人的年龄、性别、体重指数及肿瘤的分级、分期等基本临床资料,分析泌尿系统移行细胞癌病人手术前、后血清人附睾蛋白4的水平变化。结果移行细胞癌的HE4水平明显高于良性肿瘤组及健康对照组,差异有统计学意义 ...
时春雷, 朱强, 韩莎莎, 张海峰
doaj  

When Public Health Becomes the Weapon: Current and Prospective Consequences of the Genocide in Gaza

open access: yesWorld Medical &Health Policy, Volume 18, Issue 2, June 2026.
ABSTRACT Catastrophic humanitarian conditions during the 2023–2025 genocide in Gaza have caused a public health crisis of exceptional magnitude. This article summarizes key short‐ and long‐term health consequences for Gaza's civilian population and outlines priorities for recovery.
Therese Alexandra Evald   +19 more
wiley   +1 more source

飞行器助降系统

open access: yes, 2011
本发明提供了一种飞行器助降系统,以解决现有技术难以客观准确地控制飞机着陆的技术问题。该飞行器助降系统,包括拍摄视角连续可调的摄像装置、通信控制设备和总控制台,所述通信控制设备建立起摄像装置与总控制台的数据通信和控制通信连接;在预定下滑道的中线位置设置有用以安装所述摄像装置的坑室,所述控制台包括管理计算机和用以合成模拟视频和偏移量计算的视频处理单元。本发明采用的飞行器助降系统,可使飞行员获取实时飞行路线与理想下滑道的情况 ...
张建   +6 more
core  

Rapid construction of insect–plant interaction networks via multiplexed long‐fragment DNA metabarcoding and NGS

open access: yesMethods in Ecology and Evolution, Volume 17, Issue 6, Page 1896-1909, June 2026.
Abstract Molecular identification of insect food webs can accurately reveal complex trophic interactions and serve as a foundation for understanding ecosystem functioning and advancing biodiversity conservation. This process typically involves DNA library construction, high‐throughput sequencing and subsequent steps, including data assembly, annotation,
Xiao‐man Zhang   +9 more
wiley   +1 more source

基于QNX实时系统的行为辅助机器人控制系统

open access: yes, 2009
论文设计研制了行为辅助机器人验证平台,以此平台为基础可以针对行为辅助机器人进行力控制研究。针对机器人力控制的实际要求,设计了行为辅助机器人柔性关节结构,辨识了系统参数。基于QNX实时操作系统设计了控制系统软件。机器人控制系统软件主要包括传感器数据采集和控制算法两部分 ...
赵新刚   +4 more
core  

大口径长焦距平行光管光学系统设计

open access: yes, 2009
随着科学技术的进步,加工能力的增强,空间光学得到了很大的发展,越来越多的空间相机、太空望远镜被送入宇宙为人类服务。宽光谱、大口径、长焦距、高分辩率是其主流发展方向。研发与其配套的检测设备就成为当务之急。作为光学检测的必备仪器,平行光管与空间相机的发展同趋并进,得到了很大的发展:波段涵盖极紫外到远红外;通光口径从几十厘米到数米,焦距也增加到了近百米。 本文首先对国内外大口径长焦距平行光管发展状况进行调研,并详细叙述了美国航空技术有限公司的的UCA系统和洛克希德马丁公司LOTIS系统 ...
吕保斌
core  

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