Results 21 to 30 of about 602,464 (152)
, 2022 本发明属于光学流场诊断领域，针对视线非均匀吸收光谱测量中的关键中间变量积分吸光度，提供了一种积分吸光度测量误差估计方法，对视线非均匀流场下TDLAS方法测量结果的质量评估提供了输入参数。该方法包括如下步骤：第一步，基于测量所用吸收线型与线型参数范围计算非均匀性误差分布表；第二步，计算所用吸收线在非均匀流场的线型参数分布；第三步，根据测量流场线型参数分布查找非均匀性误差R1；第四步，计算非均匀流场下由吸收线重叠导致的积分吸光度误差R2；第五步，将误差R1与R2叠加得到积分吸光度估计误差R ...
李仁杰, 余西龙, 林鑫, 李飞
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, 2017 数字水准仪属于水准仪的重要组成部分，虽然在测量中具有读数客观、速度较快、精度较高、效率较高等特点，但是仍会受到诸多因素的影响导致测量的结果存在误差。为了有效降低数字水准仪在测量过程中产生误差，现有必要对误差来源进行分析。论文在明确数字水准仪的工作原理以及测量中的误差后，具体分析了影响其测量过程中出现误差的几点因素。
培效 林
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Rare Metals, Volume 45, Issue 9, September 2026.ABSTRACT Rationally selection of precursor additives during perovskite crystallization is essential for obtaining high‐quality films and achieving high‐performance perovskite solar cells (PSCs). However, the discovery and optimization of effective additives still rely heavily on time‐consuming and costly trial‐and‐error experiments.
Zhimin Feng +12 more
wiley +1 more source
Uncovering correlates of decline and critical refuges for a threatened terrestrial mammal
Conservation Biology, Volume 40, Issue 4, August 2026.Abstract Globally, the geographic ranges of numerous species are contracting. Identifying spatiotemporal patterns of threat impact can illuminate why species decline in some parts of their range but persist in others. We developed a correlative approach to identify species’ response thresholds and locate ecological refuge areas associated with ...
Natalya M. Maitz +5 more
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The Photogrammetric Record, Volume 41, Issue 195, July‐September 2026.Tri‐stereoscopic PeruSat‐1 imagery enables the simultaneous generation of 0.70 m‐resolution topography and spatially distributed Manning roughness maps, achieving 0.434 m vertical accuracy. Integrated into HEC‐RAS, these products provide consistent, high‐resolution inputs that improve hydraulic modelling and flood risk assessment in data‐scarce river ...
Jorge L. Miranda‐Pita +3 more
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Journal of Critical Infrastructure Policy, Volume 7, Issue 1, Spring/Summer 2026.ABSTRACT The National Quality Infrastructure (NQI) in a given country provides the essential framework for quality assurance integrating standardization, metrology, accreditation, and conformity assessment to create the technical backbone for industry and trade. Hence, building a resilient NQI is fundamental to securing medicine quality, enabling local
Addisu Afrassa Tegegne +3 more
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Ultrasound in Obstetrics &Gynecology, Volume 66, Issue 6, Page 747-753, December 2025.ABSTRACT Objective Ultrasound‐based fetal growth assessment is an essential part of clinical decision‐making in modern obstetric care. This study aimed to evaluate the impact of maternal and fetal characteristics on the accuracy and precision of sonographic fetal weight estimation.
M. Granfors +4 more
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New Phytologist, Volume 247, Issue 2, Page 504-517, July 2025.Summary Repetitive DNA is a feature of all organisms, ranging from archaea and plants to humans. DNA repeats can be seen both in coding and in noncoding regions of the genome. Due to the recurring nature of the sequences, simple DNA repeats tend to be more prone to errors during replication and repair, resulting in variability in their unit length ...
Sridevi Sureshkumar +3 more
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Ultrasound in Obstetrics &Gynecology, Volume 65, Issue 5, Page 624-632, May 2025.ABSTRACT Objectives Placental insufficiency contributes to many obstetric pathologies, but there is no bedside clinical tool to evaluate placental perfusion. We have developed a method to acquire multiple three‐dimensional (3D) power Doppler (PD) ultrasound (US) volumes of placental vasculature, with infrared camera tracking of the precise spatial ...
A. Xue +5 more
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Landscape‐scale predictions of future grassland conversion to cropland or development
Conservation Biology, Volume 39, Issue 1, February 2025.Abstract Grassland conservation planning often focuses on high‐risk landscapes, but many grassland conversion models are not designed to optimize conservation planning because they lack multidimensional risk assessments and are misaligned with ecological and conservation delivery scales.
Kevin W. Barnes +2 more
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