Results 1 to 10 of about 42,563 (310)

Evaluation of collector spacing, positioning, and nozzle selection methods on water distribution uniformity in center pivots. [PDF]

PLoS ONE
Proper design and periodic evaluation of center pivot irrigation systems are essential for ensuring uniform water distribution and improving water use efficiency in irrigated agriculture.
Lucas Maltoni Andrade, Rubens Alves de Oliveira, Fernando França da Cunha, Luis César Dias Drumond, Paulo Roberto Cecon, Job Teixeira de Oliveira, Catariny Cabral Aleman   +6 more
doaj   +2 more sources

Improving agricultural spraying with multi-rotor drones: a technical study on operational parameter optimization [PDF]

Frontiers in Nutrition
Drones play a key role in enhancing nutrient management efficiency under climate change scenarios by enabling precise and adaptable spray applications.
D. Yallappa, R. Kavitha, A. Surendrakumar, B. Suthakar, A. P. Mohan Kumar, Balaji Kannan, M. K. Kalarani   +6 more
doaj   +2 more sources

Modeling and Optimization of Structural Parameters for High-Efficiency Multi-Jet Polishing of Optical Glass [PDF]

Micromachines
Multi-jet polishing (MJP) is a promising method for enhanced polishing efficiency by integrating multiple nozzles, allowing for the high-efficiency polishing of large-scale surfaces.
Zhongchen Cao, Yiwei Miao, Ming Wang, Zhenfeng Zhu   +3 more
doaj   +2 more sources

Effects of nozzle orientation and spacing on flow characteristics of twin rectangular jets

Nihon Kikai Gakkai ronbunshu, 2023
The effect of the nozzle orientation and the nozzle spacing on the flow characteristics of twin rectangular jets were studied experimentally. The nozzle spacing ratio S/de of a rectangular nozzle with an aspect ratio of 2 was varied from 2.75 to 6.875 ...
Koichi HAYASHIDA, Takahiro KIWATA
doaj   +1 more source

Flow characteristics of multiple round jets with square arrangement

Nihon Kikai Gakkai ronbunshu, 2022
The present paper describes the flow characteristics of multiple round air jets with square arrangement at a relatively low-Reynolds number (Re = 4.1×103). The diameter of a round nozzle was d = 6 mm.
Hiroshi TERAMOTO, Takahiro KIWATA
doaj   +1 more source

Research on suppression and extinguishment of belt conveyor fire by water mist based on FDS

Meikuang Anquan, 2023
For exploring the influence mechanism of fine water mist system parameters on extinguishing mine belt fires, FDS was used to study the cooling characteristics and the fire extinguishing effect of fine water mist under different parameters.
He LI, Xianhua SHEN, Li TIAN, Jiexin LU, Yi LU, Gang ZENG   +5 more
doaj   +1 more source

Flow field characteristic of water jet with air ring protective layer under submerged environment and the orthogonal optimization of nozzle structure

Energy Science & Engineering, 2023
A water jet with an air ring protective layer is a promising rock‐breaking and cutting rate improvement method in submerged environment, such as oil–gas drilling. The jet flow field characteristic determines the jet impinge performance and is affected by
Liang Zhang, Qingjie Qi, Tianfang Ma, Lifeng Sun, Yue Wang, Jiamei Chai   +5 more
doaj   +1 more source

Performance of a Prototype Boom Sprayer for Bed-Grown Carrots Based on Canopy Deposition Optimization, Ground Losses and Spray Drift Potential Mitigation in Semi-Field Conditions

Applied Sciences, 2022
The H2020-project OPTIMA concept of smart sprayer relies on several functionalities, including variable nozzle spacing for bed-grown carrots, based on an air-assisted boom sprayer.
Aude Lamare, Ingrid Zwertvaegher, David Nuyttens, Paolo Balsari, Paolo Marucco, Marco Grella, Amedeo Caffini, Nikos Mylonas, Spyros Fountas, Jean-Paul Douzals   +9 more
doaj   +1 more source

Research on the Fire Extinguishing Efficiency of Low-Pressure Water Mist in Urban Underground Utility Tunnel Cable Fires

Fire, 2023
Low-pressure water mist fire extinguishing systems are a cost-effective and highly reliable option for fire protection. However, they have not yet seen widespread use in urban underground utility tunnels.
Boyan Jia, Yanwei Xia, Zhaoyu Ning, Bin Li, Guowei Zhang, Zhiwei Zhang   +5 more
doaj   +1 more source

Numerical Study of the Ejection Cooling Mechanism of Ventilation for a Marine Gas Turbine Enclosure

Polish Maritime Research, 2022
A marine gas turbine enclosure must be designed to prevent overheating of the electrical and engine control components as well as diluting potential fuel leaks.
Shi Hong, Zhang Qianwei, Liu Meinan, Yang Kaijie, Yuan Jie   +4 more
doaj   +1 more source