Monitoring and Evaluating Carbon Sink Capacity for Comprehensive Management of Soil and Water Conservation in Small Watersheds [PDF]
, 2023 [Objective] The carbon sinks of soil and vegetation were monitored and evaluated in order to provide technology and methodology for implementing dynamic monitoring and evaluation of carbon sinks for soil and water conservation projects, and to provide ...
Cheng Hui +6 more
core +1 more source
Spatial-temporal Changes and Driving Factors of Cultivated Land Intensive Use in Inner Mongolia Autonomous Region from 1985 to 2018 [PDF]
, 2022 [Objective] The spatial and temporal changes in the intensive use of arable land in Inner Mongolia Autonomous Region were studied in order to improve the intensive and sustainable use of arable land resources.
Hao Zhaohui +6 more
core +1 more source
Shuitu Baochi Xuebao, 2021 土壤保持是黄土高原首要的生态系统服务功能，对于黄土高原地区生态经济可持续发展至关重要，开展该区域的土壤保持变化和影响因素研究十分必要。基于退耕还林还草背景，综合使用InVEST泥沙输移比模块、空间自相关、地理探测器等方法模型对2000—2017年子午岭地区土壤保持服务时空变化及影响因素进行了分析。结果表明：2000—2017年，子午岭地区大量耕地转为林地和草地，土壤保持服务有所增强，其中林地的单位面积土壤保持量最高；土壤保持随海拔呈先增后减趋势，随坡度的增大而增大，区内西坡和东坡处土壤保持量最高 ...
燕玲玲 +6 more
doaj
Optimization of SCS-CN Model in a Mountainous Area on West Bank of Dianchi Lake [PDF]
, 2023 [Objective] The mountain flood runoff on the west bank of Dianchi Lake was simulated and calculated in order to provide a scientific basis for constructing flood interception facilities, reducing mountain flood disasters, and protecting the water ...
Li Jinmei, Wang Jinliang, Zhou Jingchun
core +1 more source
Dianci bileiqi, 2019 在利用电磁感应法探测变电站接地网拓扑结构的工程实际中,复杂强干扰的变电站电磁环境给微弱电磁信号的提取带来困难。针对这一问题,提出一种抗干扰措施,首先利用谐振放大技术和可编程窄带滤波器构成选频放大电路,其次采用陷波器抑制工频干扰,然后基于虚拟锁相放大技术进行信号频谱搬移,以避开干扰的主要频段,所提取的信号为地表感应磁场的矢量。基于此,设计并开发了一套变电站接地网拓扑结构无损探测系统,并在搭建的物理模型和实际小型接地网中进行了测试,验证了系统的可行性和可靠性。
李志忠 +7 more
doaj
Dianci bileiqi, 2009 工频放电电压是反映电气设备质量的重要参数之一。采用阀式避雷器试验的常规方法测量有串联间隙氧化锌避雷器的工频放电电压,将导致测量结果偏高。从工频放电试验机理入手,结合设备结构,探索出一种简便有效的测量方法。通过观察操作箱上电流数字的变化,可以有效判别间隙放电时刻,准确地测量到工频放电电压。该测量方法对三相组合式过电压保护器同样有效。
付海涛, 蔡立新, 彭兵
doaj
Study on Urban Landscape Ecological Risk Measurement and the Influencing Factors in the Yellow River Delta [PDF]
[Objective] The Yellow River Delta, a typical ecological fragile area, faces prominent landscape ecological risk (LER) due to multiple factors. Systematic understanding of landscape risk is crucial for optimizing landscape patterns and effectively ...
LI Huilin +4 more
core +1 more source
Kramers-Kronig接收机的技术问题和实用性探究（特邀）
Guangtongxin yanjiu, 2019 Kramers-Kronig（KK）接收机能从光信号的强度信息中重建相位信息,突破了单个光探测器只能检测和处理光信号强度信息的局限,是近年来光通信系统的一个研究热点。该接收机可以补偿光纤色散带来的损伤,降低系统对载波功率比的要求,能显著地提高接收机灵敏度,大大增加了系统容限和传输距离。在接收端仅用单个光探测器,极大地降低了同时检测光信号强度和相位的成本,在成本敏感的数据中心之间的光互联网络中有着光明的应用前景。然而,该接收机也存在着一定的技术问题,这可能会阻碍其在实际系统中的应用 ...
薄天外, Hoon Kim
doaj
Study on the Spatial and Temporal Changes of the Vegetation Cover and the Driving Factors in Panzhihua City from 1990 to 2020 [PDF]
[Objective] To investigate the spatial and temporal variations and the driving factors of the vegetation cover in Panzhihua City, and to provide a theoretical basis for Panzhihua City to formulate regional ecological environmental protection programs and
HE Shuqin +3 more
core +1 more source
Spatiotemporal evolution and driving forces of the externality value in rice production: a study of 30 provinces in China from 2000—2021 [PDF]
Research on the indirect value of rice production has primarily focused on ecosystem service functions, with less emphasis on externalities. This article conducts an innovative evaluation of the externality value of rice production and its significant ...
Luo, Lizhuang, Wu, Sibin, Zhou, Rongji
core +2 more sources