Results 11 to 20 of about 4,615 (118)

低温环境对支柱绝缘子视频图像识别影响分析

open access: yesDianci bileiqi, 2023
低温环境易造成绝缘子运行故障且低温风雪给人工运维带来巨大困难,图像识别正在成为低温环境绝缘子监测关键辅助手段,但低温环境对绝缘子视频图像识别影响研究缺乏。笔者以低温风雪环境支柱绝缘子为研究对象,分析了低温风雪环境对绝缘子图像识别的影响因素,主要包括:1)低温风雪环境是典型高椒盐噪声,需要对支柱绝缘子图像进行滤波降噪,提升图像质量;2)应充分采用考虑保留支柱绝缘子细节的滤波算法来进行图像识别分析;3)视频传感器建议选择CMOS传感器的低温系列,配套低温电池并配备低温环境除雾设备 ...
周文   +5 more
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广东罗坑自然保护区鳄蜥生理体温调节能力研究

open access: yes野生动物学报, 2022
为进一步探讨鳄蜥(Shinisaurus crocodilurus)的生理性体温调节能力,2018年8月,以广东省罗坑自然保护区鳄蜥研究中心成体饲养池内的鳄蜥为研究对象,探讨鳄蜥在20.0~30.0 ℃时,调节体温(Tb)与环境温度(Te)的关系。结果表明:以2.5 ℃梯度变温时,鳄蜥的调节体温与环境温度呈正相关,升温时,Tb=0.533Te+13.084(F1,48=327.65,R2=0.872 ...
何南 1 张小丽 2   +4 more
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东北林蛙和黑龙江林蛙越冬前期体温调节差异

open access: yes野生动物学报, 2022
为了解环境温度对东北林蛙(Rana dybowskii)和黑龙江林蛙(R.amurensis)体温调节能力的影响,研究了2种林蛙在不同时间(07:00、10:00、13:00、16:00、19:00)、室温及梯度变温(10、12、14、16、18、20 ℃)等条件时的体温变化规律。结果表明:2种林蛙体温调节均无显著的性别差异,林蛙体温与环境温度的变化趋势一致。环境温度最高时,2种林蛙的体温也达到最高,体温与环境温度显著正相关;体温的变化幅度 ...
李殿伟刘佳慧彭婷单洪佳张博妍孟繁星姚旭
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液压弹簧操动机构低温特性研究

open access: yesGaoya dianqi, 2022
环境温度变化对液压操动机构的机械特性(含缓冲特性)影响较大,特别是温度较低的运行环境,甚至会影响到产品的可靠运行。文中通过液压弹簧操动机构仿真建模,对其机械特性进行了仿真分析,研究了液压弹簧操动机构在不同温度下的机械特性(含缓冲特性),重点对低温工况下的低温特性进行了分析和试验研究,为液压弹簧操动机构的优化设计以及运维提供了依据。
梁传涛, 贾丽丽
doaj  

Scaling from microsite to landscape to resolve litter decomposition dynamics in globally extensive drylands

open access: yesFunctional Ecology, EarlyView.
Read the free Plain Language Summary for this article on the Journal blog. Abstract Decomposition is the transformation of dead organic matter into its inorganic constituents. In most biomes, decomposition rates can be accurately predicted with simple mathematical models, but these models have long under‐predicted decomposition in globally extensive ...
Heather L. Throop   +8 more
wiley   +1 more source

Uncovering correlates of decline and critical refuges for a threatened terrestrial mammal

open access: yesConservation Biology, EarlyView.
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
wiley   +1 more source

低压预制母线温升特性的建模仿真研究

open access: yesGaoya dianqi, 2022
低压预制母线用于10 kV柱上变压器的二次侧,是一体化改造的重要举措,而研究其温升特性具有重要意义。论文主要选取额定电流为630 A的低压预制母线作为研究对象,首先建立了其三维几何模型,采用电磁场—温度场以及电磁场—气流场—温度场耦合的多物理场模型,对其展开了仿真研究,并与型式试验结果进行了对比,验证了仿真结果的正确性。处于自然对流条件下的预制母线采用电磁场-温度场耦合模型,处于强制对流条件下的预制母线采用电磁场—气流场—温度场耦合模型。同时,文中仿真分析了不同负载情况下的预制母线温升分布情况 ...
古海良   +10 more
doaj  

Seasonal Spatial Population Density Distribution Dynamics of Lynx and Ungulate Prey in Cold‐Temperate Coniferous Forests 寒温带针叶林猞猁和有蹄类猎物种群密度空间分布的季节性动态研究

open access: yesIntegrative Conservation, Volume 5, Issue 2, Page 225-235, June 2026.
This study used camera trap data from 6 years between 2016 and 2021 and generalized linear mixed models to explore the factors that influence the spatial density distribution of lynx and its prey populations in warm and cold seasons in Inner Mongolia Hanma National Nature Reserve, China.
Wentao Zhang   +11 more
wiley   +1 more source

Synergistic Enhancement of Toluene Catalytic Oxidation via Pt‐Induced Oxygen Vacancies and Heterojunction Built‐In Electric Field

open access: yesRare Metals, Volume 45, Issue 6, June 2026.
ABSTRACT Improving catalytic activity for volatile organic compounds (VOCs) oxidation and enhancing water‐tolerance stability remain challenging in practical applications. Herein, a composite catalyst integrating Pt/CoOx‐NiOx mesoporous nanorods (MNRs) with a phenyltriethoxysilane (PhTES)‐modified surface was fabricated via a facile route for toluene ...
Jiaqin He   +13 more
wiley   +1 more source

北方低温仿自然湿地脱氮除磷强化净化技术应用

open access: yesGongye shui chuli, 2023
为强化湿地系统的脱氮除磷效果,构建具有“预处理区+主处理区+后处理区”的多生境仿自然湿地系统,辅以底质调节缓释除磷措施,形成良好的厌氧/缺氧/好氧微生环境,同时为提升湿地系统的冬季运行效果,项目对湿地系统的填料床结构、菌群/植物配置以及低温运行模式进行了优化。结果表明,多生境仿自然系统湿地系统内部能够形成良好的厌氧/缺氧/好氧交替的微生环境,通过辅助添加土壤/生石灰缓释除磷填料,可进一步提高系统的除磷效果;通过采取填料床表层保温材料覆盖、低温冰下低水位运行技术措施,能够将冰下温度控制在2~3 ...
王文冬   +7 more
doaj  

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