Results 51 to 60 of about 1,026,443 (246)
, 1989 本文研究卡尔曼滤波在电位滴定分析法中的应用。介绍了滴定分析模型、卡尔曼滤波算法及程序框图。卡尔曼滤波对于提高那些反应较慢或电极响应迟缓的滴定体系的分析准确度有很大帮援。考察了采样间隔、滴定速度及系统误差等参数对结果准确度的影响。将本法应用于HAc/NaOH、KI/AgNO_3及CaCl_2/EDTA三种下同的滴定体系 ...
钱锋, 潘忠孝, 李志良, 石乐明
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Estimating the total mortality of seabirds following a marine heat wave
Conservation Biology, EarlyView.Abstract Marine heat waves detrimentally affect a range of marine species, including seabirds, and are increasing in frequency and severity. When thousands of dead seabirds wash up on beaches, the public becomes concerned. However, the number of dead birds recorded on beaches is only a fraction of the total mortality; most birds perish at sea.
Jennifer L. Lavers +3 more
wiley +1 more source
Conservation Biology, EarlyView.Abstract Procedural, distributional, recognitional, and epistemic justice aspects of conservation interventions are well documented in contexts where pastoralism is a key livelihood and way of life. Geospatial analyses and representations of wildlife conservation and restoration that are increasingly applied in pastoralist rangeland socioecological ...
Ryan R. Unks
wiley +1 more source
Assessing differences among elasmobranch nurseries to aid conservation based on a genomics framework
Conservation Biology, EarlyView.Abstract Elasmobranch nurseries often differ in environmental conditions, demographics, and use patterns. These differences affect the distribution of genetic variation among nurseries. However, conservation and management strategies often fail to account for such differences because they are difficult to characterize.
Dominic G. Swift +8 more
wiley +1 more source
Zhongguo shiyan zhenduanxue, 2008 目的分析现有工作流程下实验室常规生化检验结果回报时间（TAT）的阈外值,探讨分析前、分析中、分析后三个阶段导致TAT延迟的因素,为优化工作流程,提高效率提供客观依据。方法选择结果回报时间超过十小时的常规生化检验记录为阈外值,分析从采集样本至检验报告返回临床医生过程中的一些时间点、时间点之间的间隔及分析前、分析中、分析后阶段的时间和总的TAT。结果收集的生化检验记录594例中,总的TAT其中位数为629分钟,第90百分位数为650分钟,分析前、分析中、分析后三个阶段时间段各自的中位数 ...
邓德耀 +7 more
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全球变局下我国大豆产业安全研究Research on the security of soybean industry under global changes in China
Zhongguo youzhi旨在深入把握我国大豆产业发展态势，助力国家粮食安全战略目标的稳步推进，围绕生产安全、市场安全、科技安全、生态安全4个量化维度，构建了基于13个指标的大豆产业安全指数评估模型。借助大豆产业的相关统计数据，分析了2013—2023年我国大豆产业的安全状况，并结合我国大豆产业振兴战略，从生产、市场、科技、生态4个方面给出大豆产业安全发展的建议。结果表明：2013—2023年，我国大豆产业整体安全程度呈现出阶段性波动态势，仅有4年处于基本安全区间，总体安全水平仍有较大上升空间；生产安全指数受自给率 ...
高峰1，王剑2，魏同洋2，武婕2，宋正阳2GAO Feng1, WANG Jian2, WEI Tongyang2, WU Jie2, SONG Zhengyang2
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, 2015 采用宏观观察、金相观察、扫描电子显微分析、能谱分析、电子背散射衍射分析等方法,对换热器制造时,液压胀管工艺导致2205不锈钢管破裂的原因进行了分析研究。结果表明:双相不锈钢管的裂纹源处于钢管外表面单相奥氏体带状组织区域,且该区域内部晶粒粗大并存在局部的成分偏析,于胀管前已存在微裂纹。胀管时由于裂纹尖端应力集中,导致裂纹向管壁内侧扩展 ...
陈惠锋 +4 more
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Emerging applications of large language models in ecology and conservation science
Conservation Biology, EarlyView.Abstract Large language models (LLMs) mark a major development in artificial intelligence, with potentially transformative implications for ecology and conservation science. Built on advanced deep‐learning architectures, these models can support a wide range of tasks. We reviewed emerging applications of LLMs, drawing on the wider scientific literature
Christos Mammides +5 more
wiley +1 more source
Gaoya dianqi, 2017 通过试验研究了频率响应分析法检测变压器绕组变形。首先分析了频率响应分析法检测变压器绕组变形的基本原理。建立了频率响应分析法试验平台,分析了影响频率响应分析法检测绕组变形结果的主要因素。结合相关系数法对两个典型算例变压器绕组进行了变形诊断分析。通过对变压器的频率响应测试数据比较分析,结果表明了用频率响应分析法判断变压器绕组变形仍存在一定的局限性。
张海军, 王曙鸿, 刘艳琴
doaj
Spatial overlay analysis of land use vector data based on Spark(基于Spark的土地利用矢量数据空间叠加分析方法)
Zhejiang Daxue xuebao. Lixue ban, 2016 针对海量土地利用矢量数据空间叠加分析的效率问题，提出了基于Spark的土地利用矢量数据空间叠加分析方法，通过弹性分布式数据集实现索引过滤与叠加计算，为解决空间叠加分析的瓶颈问题做了新的尝试.实验结果表明，相较基于Oracle数据管理的叠加分析方法，该方法显著提高了空间叠加分析效率，更适合面向海量土地利用矢量数据的叠加分析.
JINFengying(靳凤营) +4 more
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