Results 11 to 20 of about 4,187 (295)

Detection of Plastic Greenhouses Using High Resolution Rgb Remote Sensing Data and Convolutional Neural Network [PDF]

Journal of Environmental Geography, 2021
Agricultural production in greenhouses shows a rapid growth in many parts of the world. This form of intensive farming requires a large amount of water and fertilizers, and can have a severe impact on the environment.
Jakab Balázs, van Leeuwen Boudewijn, Tobak Zalán   +2 more
doaj   +2 more sources

Analysis of Wind Pressure Coefficients for Single-Span Arched Plastic Greenhouses Located in a Valley Region Using CFD

Agronomy, 2023
The wind pressure coefficient is essential for calculating the wind loads on greenhouses. The wind pressure on single-span arched greenhouses built in valleys differs from those in plain regions.
Zongmin Liang, Guifeng He, Yanfeng Li, Zixuan Gao, Xiaoying Ren, Qinan Wu, Shumei Zhao, Jing Xu   +7 more
doaj   +2 more sources

Effects of Uplift Resistance on Continuous-Pipe-Foundation of Single-Span Plastic Greenhouse by Steel Plate Pipe Connector

Agriculture, 2022
The single-span plastic greenhouses are affected by strong winds which generate uplift resistance causing the bending of members, damage to protective films, and damage to crops.
Myeonghwan Kim
doaj   +2 more sources

Study on the Cooling Effect of Double-Layer Spray Greenhouse

Agriculture, 2023
Greenhouses provide suitable environmental conditions for plant growth. Double-layer plastic greenhouses are often used in many regions to ensure normal crop growth during winter since single-layer plastic greenhouses have poor insulation.
Jihang Xu, Weitao Bai, Jian Wang, Zhihui Mu, Weizhen Sun, Boda Dong, Kai Song, Yalan Yang, Shirong Guo, Sheng Shu, Yu Wang   +10 more
doaj   +2 more sources

Estimation of Thermal Performance and Heat Loss in Plastic Greenhouses with and without Thermal Curtains

Energies, 2018
Greenhouses are important for stable food production, but require large amounts of energy to maintain their microclimate in regions with harsh climates. This study assessed the internal thermal insulation performance of thermal curtains in double-layered
Hyung-Kweon Kim, Geum-Choon Kang, Jong-Pil Moon, Tae-Seok Lee, Sung-Sik Oh   +4 more
doaj   +2 more sources

Predicting Minimum Temperatures of Plastic Greenhouse During Strawberry Growing in Changfeng, China: A Comparison of Machine Learning Algorithms and Multiple Linear Regression

Agronomy
Scientific management and environmental regulation of facility strawberries depends on the level of accurate prediction and forecasting of low temperature freezes in plastic greenhouses during winter and spring strawberry cultivation.
Xuelin Wang, Qinqin Huang, Dong Wu, Jinhua Xie, Ming Cao, Jun Liu   +5 more
doaj   +2 more sources

Wind Loads on Single-span Plastic Greenhouses and Solar Greenhouses [PDF]

HortTechnology, 2013
Wind tunnel tests were conducted in an NH-2-type wind tunnel to investigate the wind pressure coefficients and their distribution on the surfaces of a single-span plastic greenhouse and a solar greenhouse. Wind pressures at numerous points on the surfaces of the greenhouse models were simultaneously measured for various wind ...
Zai Q. Yang, Yong X. Li, Xiao P. Xue, Chuan R. Huang, Bo Zhang   +4 more
openaire   +2 more sources

Evaluating the Ventilation Performance of Single-Span Plastic Greenhouses with Continuous Screened Side Openings

Agronomy
Natural ventilation is the most cost-effective environmental control method for protected horticulture. To overcome the issues associated with high temperatures in greenhouses, analyzing their ventilation characteristics and maximizing their natural ...
Hyung-Kweon Kim
doaj   +2 more sources

Optimization of Structural Configuration and Ridge Height for Large-Span Insulated Plastic Greenhouse Based on Finite Element Analysis

Agriculture
The large-span insulated plastic greenhouse is a highly promising horticultural facility. The design parameters and configuration of structural components significantly impact their safety and load-bearing performance.
Xiaoxing Dong, Fengzhi Piao, Nanshan Du, Han Dong, Tao Zhang, Yanping Qin, Yaling Li, Zhixin Guo   +7 more
doaj   +2 more sources

Solar radiation model and optimization of asymmetric large-span externally insulated plastic greenhouses. [PDF]

PLoS One
To improve the light environment of asymmetric large-span externally insulated plastic greenhouses, a solar radiation model that considers the projection path equations of the insulation quilts and validated the model was established.
Wang C, Liu K, Ma H, Li T, Wang S, Zhang D, Wei M.   +6 more
europepmc   +2 more sources