Results 51 to 60 of about 1,549 (163)
Fault diagnosis method based on modified random forests [PDF]
, 2009 为解决不可识别故障诊断中无法有效定位的问题,提出一种基于改进随机森林的故障诊断方法。该方法通过改进决策树的bAggIng方式,采用条件概率指数进行决策树的无偏节点分裂,并以权重投票法综合决策树的分类结果。在此基础上,利用变量重要性测量来获取辅助故障定位的故障原型指数,从而较好地弥补了随机森林和传统机器学习在故障诊断中的不足和局限性。最后在一个标准数据集和田纳西-伊斯曼故障诊断的问题上进行验证,结果证明了该方法的有效性与可行性。To solve the problem of inefficient ...
吴长庆 +4 more
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Functional Ecology, Volume 39, Issue 2, Page 621-634, February 2025.Read the free Plain Language Summary for this article on the Journal blog. Abstract Tropical forests are generally characterized by high species diversity and low soil phosphorus (P) availability. Although tropical plants have evolved adaptations to low soil P availability, we know relatively little about the strategies of different groups of species ...
Yingxu Fan +11 more
wiley +1 more source
Study on rapid determination method of ash content in wheat flour based on stochastic forest regression model [PDF]
ObjectiveTo achieve rapid and accurate determination of ash content in wheat flour.MethodsBy preprocessing wheat raw materials and analyzing key influencing factors such as milling time and conductivity in depth, these factors were introduced as ...
CHEN Caihong, LIU Yanqun, XIAO Fugang
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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
wiley +1 more source
Shuitu Baochi Xuebao, 2023 可溶性碳组分是土壤有机碳库中最活跃的部分,作为土壤碳周转初期变化的敏感指标,其含量受到凋落叶等植物残体输入、森林类型及季节性水热变化的共同调节。采用土壤原位培养法,以亚热带米槠(Castanopsis carlesii)人工林与杉木(Cunninghamia lanceolata)人工林为对象,分析生长季内土壤可溶性碳(DOC)与热水溶性碳(HWSC)含量动态变化及其对凋落叶输入的响应趋势。结果表明,凋落叶输入、森林类型和培养月份均极显著影响土壤可溶性碳组分含量(p＜0.001 ...
张可欣 +5 more
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Ultrasound in Obstetrics &Gynecology, Volume 64, Issue 6, Page 768-775, December 2024.Abstract Objective Lower urinary tract obstruction (LUTO) is a chronic condition with a spectrum of outcomes. It is usually suspected prenatally based on ultrasound features (USFs). Given the unknown postnatal trajectory and the potential for significant morbidity and mortality, many families choose termination of pregnancy (TOP), often based on USFs ...
J. Richter +10 more
wiley +1 more source
Shuitu Baochi Xuebao, 2018 采用土壤颗粒分级方法，以湘中丘陵区地域相邻、环境条件基本一致的4种林地：檵木—南烛—满山红灌草丛（LVR）、檵木—杉木—白栎灌木林（LCQ）、马尾松—石栎—檵木针阔混交林（PLL）和石栎－红淡比－青冈常绿阔叶林（LAG）为对象，研究土壤有机碳（SOC）及不同粒径土壤颗粒有机碳含量随着林地退化的变化特征，剖析林地退化对中亚热带森林SOC库的影响机制。结果表明：随着林地退化，>2 μm砂粉粒百分含量增高 ...
王娜 +4 more
doaj
Applications of nuclear magnetic resonance spectroscopy and Raman spectroscopy in the studies of hepatic cancer and nasopharyngeal carcinoma [PDF]
, 2016 癌症是全人类共同面临的健康问题。在我国东南沿海地区，肝细胞性肝癌（hepatocellularcarcinoma，HCC）和鼻咽癌（nasopharyngealcarcinoma，NPC）形势尤为紧迫。当前针对HCC和NPC的诊疗手段因受各种因素影响而作用十分有限。针对区域性重要恶性肿瘤疾病的实验研究和临床需求出发，本文利用核磁共振波谱、拉曼光谱和表面增强拉曼光谱等技术分别研究HCC和NPC的血液、细胞株以及亚细胞组分等生化样本的谱学特征，结合多种统计学方法从诊、疗两个层面探索相关的生物标记物 ...
陈阳
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Does (dis)agreement reflect beliefs? An analysis of advocacy coalitions in Swiss pesticide policy
European Policy Analysis, Volume 10, Issue 4, Page 488-514, Fall 2024.Abstract Agricultural pesticide use is a wicked sustainability challenge: Trade‐offs exist between health, environmental, agro‐economic, and socio‐political objectives. Various actors involved have diverse beliefs regarding these trade‐offs and policies to address the challenge.
Milena Wiget
wiley +1 more source
Zhongguo youzhi为准确识别法庭科学领域中微量油脂物证，给涉及微量植物油物证鉴定的相关案件提供技术支持，以遗留在不同载体上并在4、25、38 ℃下分别放置1、3、7、14、30、45、60 d的8种微量植物油（亚麻籽油、油茶籽油、菜籽油、玉米油、花生油、芝麻油、大豆油、葵花籽油）为研究对象，利用气相色谱技术测定其脂肪酸组成，以 5种主要脂肪酸（十六烷酸、硬脂酸、油酸、亚油酸、亚麻酸）作为识别指标，结合化学计量学方法构建Fisher判别分析、卷积神经网络和随机森林3种植物油识别模型。结果表明：Fisher判别分析 ...
胡昆，张成龙，杨瑞琴 HU Kun, ZHANG Chenglong, YANG Ruiqin
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