The most serious potential hazard of cowpea product is the pesticide residue for controlling such pests as thrips and cowpea pod borer. To explore a safe and efficient mode of cowpea production that is fit for climati...The most serious potential hazard of cowpea product is the pesticide residue for controlling such pests as thrips and cowpea pod borer. To explore a safe and efficient mode of cowpea production that is fit for climatic characteristics of Hainan, ensure the safety of cowpea supply, minimize the use of pesticides, and control pests in physical means, insect-proof nets are applied in cowpea cultivation. We set 5-mm, 2.5-mm and 1.67-ram insect-proof nets as three treatments and open filed cultivation as CK to explore efficiency of insect-preof net in cowpoa production in terms of insect-proof efficiency, biological characters and commodity properties and yield of cowpea. The results showed that insect-proof cultivation was efficient in controlling pests, especially the 2.5-mm net showed the optimal effect for cowpea production.展开更多
The experiment was mainly used to study the effect of insect-proof net mulching cultivation technology on the temperature and humidity of the greenhouse and the spring shoot growth of citrus Shatangju. The results sho...The experiment was mainly used to study the effect of insect-proof net mulching cultivation technology on the temperature and humidity of the greenhouse and the spring shoot growth of citrus Shatangju. The results showed that the 40-mesh translucent insect-proof net had a positive effect on the spring shoot growth of Shatangju in the spring from January to April. In the meantime,according to the change of the temperature and humidity inside and outside the insect-proof net and the change of quantity of Aleyrodidae,Tetranychidae and Phyllocnisidae,it was found that the role of insect-proof net in enhancing the spring shoot growth of Shatangju was possibly achieved by the regulation of citrus pests and the temperature and humidity inside the net.展开更多
Many dwellings in warm-humid climates attain a comfortable environment by natural ventilation.The opening of exterior windows for ventilation allows the entry of insects along with the breeze.As a remedy,occupants ins...Many dwellings in warm-humid climates attain a comfortable environment by natural ventilation.The opening of exterior windows for ventilation allows the entry of insects along with the breeze.As a remedy,occupants install insect-proof screens on windows resulting in reduced airflow into the interior.This study attempts to evaluate the air change effectiveness and thermal comfort in a residential kitchen with insect-proof screens.A kitchen with insect-proof screens on the windows is compared with a case without insect-proof screens.Numerical simulation was conducted using ANSYS Fluent 2019 R2.The insect-proof screen is modelled as a porous media.The air velocity and temperature measurements were validated by measurements in a real scenario.The presence of insect-proof screens reduced the air velocity inside the space by 82%.However,the airflow pattern in the case with screens was more uniformly distributed.The mean age of the air was considerably higher in the case with insect-proof screens,which in turn resulted in a reduced ACE.The presence of an insect-proof screen resulted in a Predicted Mean Vote(PMV)of 2.79 indicating a‘hot’sensation,whereas in the other case,the comfort vote is only 1.93 indicating a‘warm’sensation.The presence of insect-proof screens on windows reduced the air velocity and ventilation efficiency,contributing to increased thermal discomfort in the kitchen.展开更多
文摘The most serious potential hazard of cowpea product is the pesticide residue for controlling such pests as thrips and cowpea pod borer. To explore a safe and efficient mode of cowpea production that is fit for climatic characteristics of Hainan, ensure the safety of cowpea supply, minimize the use of pesticides, and control pests in physical means, insect-proof nets are applied in cowpea cultivation. We set 5-mm, 2.5-mm and 1.67-ram insect-proof nets as three treatments and open filed cultivation as CK to explore efficiency of insect-preof net in cowpoa production in terms of insect-proof efficiency, biological characters and commodity properties and yield of cowpea. The results showed that insect-proof cultivation was efficient in controlling pests, especially the 2.5-mm net showed the optimal effect for cowpea production.
基金Supported by Special Construction Project of Modern Agriculture(Citrus)Industry Technology System(cars-27)
文摘The experiment was mainly used to study the effect of insect-proof net mulching cultivation technology on the temperature and humidity of the greenhouse and the spring shoot growth of citrus Shatangju. The results showed that the 40-mesh translucent insect-proof net had a positive effect on the spring shoot growth of Shatangju in the spring from January to April. In the meantime,according to the change of the temperature and humidity inside and outside the insect-proof net and the change of quantity of Aleyrodidae,Tetranychidae and Phyllocnisidae,it was found that the role of insect-proof net in enhancing the spring shoot growth of Shatangju was possibly achieved by the regulation of citrus pests and the temperature and humidity inside the net.
基金supported in part by the Department of Science and Technology,Ministry of Science and Technology,Government of India through the project-Community-Scale Energy Demand Reduction in India(CEDRI)under Grant DST/TMD/UK-BEE/2017/20.
文摘Many dwellings in warm-humid climates attain a comfortable environment by natural ventilation.The opening of exterior windows for ventilation allows the entry of insects along with the breeze.As a remedy,occupants install insect-proof screens on windows resulting in reduced airflow into the interior.This study attempts to evaluate the air change effectiveness and thermal comfort in a residential kitchen with insect-proof screens.A kitchen with insect-proof screens on the windows is compared with a case without insect-proof screens.Numerical simulation was conducted using ANSYS Fluent 2019 R2.The insect-proof screen is modelled as a porous media.The air velocity and temperature measurements were validated by measurements in a real scenario.The presence of insect-proof screens reduced the air velocity inside the space by 82%.However,the airflow pattern in the case with screens was more uniformly distributed.The mean age of the air was considerably higher in the case with insect-proof screens,which in turn resulted in a reduced ACE.The presence of an insect-proof screen resulted in a Predicted Mean Vote(PMV)of 2.79 indicating a‘hot’sensation,whereas in the other case,the comfort vote is only 1.93 indicating a‘warm’sensation.The presence of insect-proof screens on windows reduced the air velocity and ventilation efficiency,contributing to increased thermal discomfort in the kitchen.
