Results 41 to 50 of about 6,756 (156)
Spatial-temporal Patterns and Factors of Soil Moisture in the Middle Reaches of the Yellow River under Changing Environments [PDF]
[Objective] To identify the main driving factors of soil moisture in the middle reaches of the Yellow River, to analyze the impact of land cover and climate change on soil moisture changes in the middle reaches of the Yellow River, and to provide a ...
HAN Qinggong +3 more
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Integrative Conservation, Volume 3, Issue 4, Page 398-409, December 2024.Understanding the potential impacts of projected climate change scenarios on critically endangered species is critical to guide effective conservation planning. Species distribution modelling techniques such as MaxEnt are increasingly becoming important tools for predicting habitat shifts in response to projected climate change scenarios.
Mark Zvidzai +4 more
wiley +1 more source
Guangtongxin yanjiu, 2020 针对光纤布拉格光栅（FBG）超声探测传感器测量灵敏度和量程相互制约的问题,文章提出了一种基于法布里珀罗（FP）腔和π相移FBG（π-FBG）的解调方案。文章分析了利用FP腔解调的原理并进行了详细的数值仿真分析。理论分析表明,利用FP腔的两个纵模作为一组解调器同时解调,可将系统灵敏度提高两倍,并且具有很好的线性度。扩展到多个纵模时可构建解调器阵列,从而极大地提高了系统的量程,有效地解决了测量灵敏度和量程相互制约的问题。数值仿真结果表明,该方案在实际可操作参数范围内切实可行,并具有灵敏度高和响应速度快等优势。
高在青 +3 more
doaj
Risk Assessment and Influencing Factors Analysis of Heavy Metals in Soil of Non-Surface Coal Mines in Southern Hebei Province [PDF]
Non-surface coal mining is an important means to obtain coal resources. It is crucial to study the influencing factors and ecological risks of soil heavy metal contents of non-surface coal mines for the protection and management of mine area ecosystems ...
Anbing ZHANG +5 more
core +1 more source
Gaoya dianqi, 2012 为了了解设备表面和内部的工频电场,从而更好地研究设备运行的状态及优化改进设备,笔者介绍了一维球型电场传感器的测量原理,设计了一种基于C8051F410单片机的便携式工频电场测量装置,讨论了不同形状及规格电场探头对测量结果的影响并完成了电场探头的选型。在500 kV交流输电线下方和实验室简化同心圆球电极内使用该装置与国外标准仪器进行了对比测量,现场测试结果表明该装置测量数据与国外仪器相比具有较大的相关度,能准确地测量电力系统工频电场,具有很好的实用性。
刘聪汉, 何为, 汪金刚, 胡泽文
doaj
The Spatio-temporal Evolution of NDVI in the Three Gorges Reservoir Area Driven by the Synergistic Effect of two Factors over the Past 21 Years [PDF]
[Objective] To clarify the spatio-temporal characteristics of vegetation evolution in the Three Gorges Reservoir Area, and to quantitatively analyze the relationships between vegetation and key determinants, including climate, terrain, and human ...
LI Cheng +5 more
core +1 more source
Analysis and risk evaluation of current land subsidence in Ningbo City [PDF]
, 2023 In response to evaluating the current status and assessing the risk assessment requirements of land subsidence in Ningbo City, the characteristics of land subsidence in recent years were analyzed using InSAR remote sensing monitoring data and subsidence ...
Feng GAO +4 more
core +1 more source
低空无人飞行器遥感技术在重庆城口滑坡堰塞湖灾害监测中的应用研究
Shuitu Baochi Xuebao, 2011 应用无人飞行器低空遥感技术对重庆城口滑坡地质灾害进行监测,分析了无人飞行器低空遥感技术在复杂地形及气象条件下数据获取与数据处理的技术流程和方法,并对无人飞行器低空遥感技术在滑坡地质灾害灾情评估和灾损评价中的应用上进行了探索.结果表明,无人飞行器低空遥感技术在困难地区完成遥感数据的获取与处理、三维建模和应用分析具有明显优势;无人飞行器低空遥感技术生成的数字正射影像图和数字高程模型数据可以为地质灾害发生后的抢险救灾、灾情评估和灾后重建提供准确、直观、翔实的基础数据和统计分析数据 ...
马泽忠, 王福海, 刘智华, 刘学
doaj
Zhejiang Daxue xuebao. Lixue ban, 2022 陕甘宁革命老区是黄土高原和黄河中上游的重点生态治理区，作为重要的生态屏障区，其生态治理意义重大。以陕甘宁革命老区为研究区域，基于改进的生态系统服务价值（ecosystem service value，ESV）当量因子法，利用地理探测器及地理加权回归（geographically weighted regression，GWR）模型，分析1995—2018年各县ESV时空变化特征、影响因素及各主导因素作用强度的空间分异特征。结果表明：（1）1995—2018年，陕甘宁革命老区ESV呈先下降后上升的特征 ...
ZHUXiangjun(朱相君), XUELiang(薛亮)
doaj +1 more source
Effects of Landuse Change on Spatial and Temporal Patterns of Carbon Sources/Sinks in Huainan Mining Area from 2000 to 2020 [PDF]
, 2023 [Objective] The spatial and temporal distribution characteristics of land use carbon sources/sinks in the Huainan mining area from 2000 to 2020 were analyzed, in order to provide a basis for Huainan City’s territorial spatial planning and future low ...
Chen Xiaoyang +5 more
core +1 more source