Results 81 to 90 of about 4,542,550 (227)

Plant protection in post-Soviet Kazakhstan: the loss of an ecological perspective [PDF]

, 2009
This thesis examines why and how plant protection issues are embedded in political, economic and social contexts. It analyses the domain of plant protection in Kazakhstan under two different socio-economic and political formations, namely the Soviet ...
Toleubayev, K.
core  

Design and Development of a Side Spray Device for UAVs to Improve Spray Coverage in Obstacle Neighborhoods

Agronomy
Electric multirotor plant protection unmanned aerial vehicles (UAVs) are widely used in China for efficient and precise plant protection at low altitude for low volumes.
Fanrui Kong, Baijing Qiu, Xiaoya Dong, Kechuan Yi, Qingqing Wang, Chunxia Jiang, Xinwei Zhang, Xin Huang   +7 more
doaj   +1 more source

Mapping Scytonemin Pigment Content and Biocrust Functional Indicators Using High‐Resolution Multispectral Imagery

Remote Sensing in Ecology and Conservation, EarlyView.
We demonstrate that high‐resolution multispectral imagery combined with machine learning can accurately predict key biocrust functional indicators, particularly the UV‐protective pigment scytonemin, across dryland ecosystems. Using fine‐scale imagery acquired in the Chihuahuan Desert and Colorado Plateau, we identified spectral bands strongly ...
Raúl Román, Tong Qiu, Fernando T. Maestre, Elizabeth A. La Rue, Sergio Vargas Zesati, Anthony Schaefer, Ryan V. Trexler, Nicole Pietrasiak, Estelle Couradeau   +8 more
wiley   +1 more source

A Path Planning Algorithm for Plant Protection UAV for Avoiding Multiple Obstruction Areas

IFAC-PapersOnLine, 2018
China's farmland environment is complex. The planting area often contains some irregular obstacles. It is hard for plant protection UAV (Unmanned Aerial Vehicle) to get good planning results to avoid obstacles automatically in the autonomous mode or only through sensors. In order to improve the application scope for plant UAVs with autonomous operation
Liu Yunling, Xu Zili, Li Na, Xu Shuxiang, Yuan Gang   +4 more
openaire   +1 more source

Improved Cerrado Wetland Mapping Through Seasonal Moisture Metrics, Terrain Information and Semantic Segmentation

Remote Sensing in Ecology and Conservation, EarlyView.
Brazil's Cerrado valley wetlands—swamp savanna and gallery forest—are highly important for the biome's water cycle and carbon storage and are susceptible to degradation from the impacts of land use expansion and the climate crisis. In support of their detailed monitoring and assessment, we developed and tested a transferable mapping approach that ...
Felix Beer, Hugo do Nascimento Bendini, Mateus de Souza Miranda, Vu‐Dong Pham, Leila Maria Garcia Fonseca, Cássia Beatriz Rodrigues Munhoz, Sebastian van der Linden   +6 more
wiley   +1 more source

Report on “13th Arab Congress of Plant Protection”, Hammamet, Tunisia, 16-21 October 2022

, 2023
13th Arab Congress of Plant Protection (13th ACPP), organized by the Arab Society of Plant Protection (ASPP) in collaboration with the Ministry of Agriculture, Water Resources and Fisheries of Tunisia, represented by the National Institute of Agronomic ...
Kumari, Safaa
core  

Time-varying dynamic modeling and trajectory tracking control for variable-load unmanned aerial vehicle [PDF]

Frontiers of Agricultural Science and Engineering
The dynamic variation issues of variable-load unmanned aerial vehicle (UAV) used in agricultural plant protection activities was addressed by a disturbance-resistant control system based on PD (proportional-derivative) sliding mode control. First, a time-
Xin ZHANG, Shuting XU, Wenjie CHANG, Feng KANG   +3 more
doaj   +1 more source

Paradigms and Principles for Integrating Nature Technology Data: Challenges, Opportunities, and Next Steps in Real‐World Biodiversity Monitoring

Remote Sensing in Ecology and Conservation, EarlyView.
We propose a set of paradigms (survey design, tip and cue, validation, consilience, interpolation and extrapolation, and data fusion) and prioritize a set of principles (metadata standards, use rights and licensing, scientific rigor, and utility) as the foundations of an actionable framework for nature technology data integration. We then analyze seven
Seamus Lombardo, Amy Rosenthal, Christopher Anderson, Ken Bagstad, Carly Batist, Christopher Beirne, Paul Bunje, Marconi Campos‐Cerqueira, Jeremy Cusack, Elsa Carla De Grandi, Rachel King, Trond Larsen, David Luther, Jennifer McGowan, Adrien Pajot, Xavier Raick, Vijay Ramesh, Chelsea Smith, Ali Swanson, Tom Walker   +19 more
wiley   +1 more source

Exploring the operation mode of spraying cotton defoliation agent by plant protection UAV

International Journal of Precision Agricultural Aviation, 2018
Abstract: The method for UAV spraying of cotton defoliating agent in theYellowRiver basin was investigated in this study through comparison of a one-time pesticide application experiment and a two-time pesticide application experiment.  The experiment was carried out using a Jifei P30 multi-rotor electric UAV.  The experiment was divided into five ...
Hui Kong, Lili Yi, Yubin Lan, Fanxia Kong, Xin Han   +4 more
openaire   +1 more source

Directive Antenna Clutter Loss in Slant Paths

International Journal of Satellite Communications and Networking, EarlyView.
ABSTRACT This paper investigates the development of a clutter loss model specifically for slant paths involving directive antennas. Conventionally, clutter loss is characterized by using isotropic antennas to facilitate standard link budget calculations via single antenna gain values.
Fernando Pérez Fontán, Vicente Pastoriza‐Santos, Fernando Machado Domı́nguez, Thomas Prechtl, Pavel Pechac   +4 more
wiley   +1 more source