Results 61 to 70 of about 20,582 (174)
Detecting mass mortality events in wildlife populations
Conservation Biology, Volume 40, Issue 1, February 2026.Abstract Reports in the literature of mass mortality events (MMEs) involving diverse animal taxa are increasing. Yet, many likely go unobserved due to imperfect detection and infrequent sampling. MMEs involving small, cryptic species, for instance, can be difficult to detect even during the event, and degradation and scavenging of carcasses can make ...
Jesse L. Brunner, Justin M. Calabrese
wiley +1 more source
高电压测量不确定度的评定与表示——在避雷器绝缘子高电压测量中的应用
Dianci bileiqi, 2012 介绍了有关测量不确定度的基本术语及其概念,包括:测量不确定度、实验标准偏差、标准不确定度、合成标准不确定度、扩展不确定度、包含因子、不确定度的A类评定、不确定度的B类评定、测量误差等。从定义、计算方式、分类、符号、与测量结果的关系、与测量条件的关系等方面分析了测量不确定度与测量误差之间的区别,并简要介绍了测量不确定度和测量误差之间的联系,即测量不确定度是由测量误差引起的,两者都是由随机效应和系统效应造成的。给出了高电压测量不确定度评定的6个基本步骤。在高电压测量不确定度评定示例中 ...
张益民, 庞瑾
doaj
3D Measurement Technology Based on Shape From Silhouette [PDF]
, 2009 摘要 三维测量技术已成为现代测试技术中一个重要的研究领域。SFS(ShapeFromSilhouette)是被动式3D测量方法，即为视觉测量技术，具有非接触式测量的优点：测量速度快，软工件、薄工件、不可接触的高精密工件可直接测量等。近些年来，越来越受到人们的重视。 本文以SFS三维测量技术为主线，提出了一种将SFS技术应用在三坐标机上的新方法，构建了一套自动的视觉测量硬件系统；采用MATLAB和VC混合编程，完成了视觉测量软件系统;采用所搭建的视觉测量系统对物体进行三维测量，通过采集图像、提取轮廓 ...
谢路生
core
Mitigating light pollution impacts on arthropods based on light‐emitting diode properties
Conservation Biology, Volume 40, Issue 1, February 2026.Abstract Light pollution from artificial light at night (ALAN) is a significant environmental problem with far‐reaching consequences for ecological systems. Recent innovations in light‐emitting diode (LED) technology may offer sustainable outdoor lighting solutions, but scientific evidence is lacking. We investigated the effects of various LED lighting
Nicola van Koppenhagen +3 more
wiley +1 more source
Gaoya dianqi, 2008 笔者组建了一套直流下局部放电试验与测量系统,由放电脉冲波形超宽带测量系统和超高频信号测量系统组成。设计了6种油纸绝缘局放模型以模拟换流变压器的典型缺陷。直流下试验结果表明:缺陷模型放电稳定,相同条件下放电重复性好;测量系统可以准确检测到放电脉冲波形和超高频信号。为研究直流下局部放电脉冲单个波形、脉冲序列以及超高频信号在线监测等提供了试验研究平台。
司文荣 +5 more
doaj
, 2018 采用动态热电偶法测量齿轮啮合区的齿面闪温特性的的方法,选用STM32F103x芯片作为齿轮闪温信号的采集和转换控制器,提出一种异步采集传输方法,编写上位机软件对采集到的信号进行滤波和处理后绘制曲线图。测试结果显示本系统采集到的齿轮齿面闪温曲线与理论图形吻合度较高 ...
郭向, 陈伟
core
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
Shiyou jixie, 2015 为解决当前随钻测量仪器中基于地磁定姿方案易受干扰，惯性导航方案成本高、不易小型化等问题，提出了利用微惯组和磁强计进行组合随钻测量的新方法，设计了低成本微惯组/磁强计组合随钻测量系统。根据系统的总体要求，确定了系统组成、测姿方案以及联邦滤波器的架构，完成了硬件和软件算法的设计，并搭建出原理样机。通过试验得出系统的方位角精度为±1°；通过仿真分析得出系统的误差跟踪和隔离效果明显，干扰状态下仍能使方位角误差保持在±1.5°内，倾斜角和工具面角误差保持在0.5°以内，基本满足随钻测量的精度要求。微惯组 ...
张春熹, 徐美宝, 林铁, 程世超
doaj
The Development of Microwave Automeasurement System Based on Virtual Instrument Technology [PDF]
, 2007 为了满足现代微波实验教学的需要,根据手动测量系统的实验原理,我们在常规测量系统的基础上配置计算机、步进电机、硬件电路和相应软件实现了自动微波测量系统。该系统可实现微波多参数的测量，方便地测出点频状态下的波导波长、频率、驻波比、复反射系数、负载阻抗、扫频状态下的谐振腔Ｑ值、中心频率及带宽等。系统既可以手动又可以自动测量，在自动测量时以微机为主体，微机按照预定编制的程序，模拟手动测量线的方法和步骤进行采集、运算、误差分析与处理等测量，除了实现手动状态下的测量功能，自动状态下还能进行普通衰减器的定标 ...
王陈宁
core
SWEET1‐mediated glucose transport is crucial for energy availability in Arabidopsis
New Phytologist, Volume 249, Issue 4, Page 1816-1830, February 2026.Summary The stress‐responsive hormone abscisic acid (ABA) is known for its inhibitory effects on various physiological processes, including seed germination, often resulting in energy deprivation. Interestingly, ABA‐induced germination inhibition can be alleviated by exogenous glucose (Glc), mimicking a functional interplay between ABA and sugar ...
Xueyi Xue +3 more
wiley +1 more source