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Numerical investigation for effects of natural light and ventilation on 3D tomato body heat distribution in a Venlo greenhouse

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Information Processing in Agriculture 2023年第4期10卷 535-546页

作者： Guanghui Yu Shanhong Zhang Shuai Li Minshu Zhang Hüseyin Benli Yang Wang National Innovation Center for Digital Fishery China Agricultural UniversityBeijing 100083China Laboratory of Smart Farming Technologies for Aquatic Animal and Livestock Ministry of Agriculture and Rural AffairsChina Agricultural University100083BeijingChina Engineering and Technology Research Center for Internet of Things in Agriculture China Agricultural University100083BeijingChina College of Information and Electrical Engineering China Agricultural UniversityBeijing 100083China Department of Technical and Vocational Education Firat UniversityTR-23119 ElazigTurkey for Huseyin Benli

Maintaining suitable temperature level around tomato in the greenhouse is essential for the high-quality production.However,in summer,the temperature level around the tomato is usually unclear except using a high-precision temperature imager.To solve this problem,thermal performance of 3D(three-dimensional)tomato model built based on SolidWorks was investigated by the computational fluid dynamics(CFD)simulations.To assess the effect of temperature distribution around the tomato,a simplified 3D tomato numerical model was firstly validated by a set of field measurement data.The light intensity and indoor ventilation were regarded as the mainly environment factors in the Venlo greenhouse,thermal stratification around tomatoes at different time of day was further studied.The numerical results illustrated the different temperature distribution around tomato body under different radiation intensity.It was found that ventilation could obviously adjust the temperature gradient around the tomato,and alleviate high temperature effect particularly in summer.Suitable ventilation could create a suitable thermal environment for the tomato growth.This study clearly demonstrated 3D temperature distribution around tomatoes,which is beneficial to provide the reference for accurate detection of 3D tomato temperature and appropriate thermal environment design.

关键词： CFD 3D Tomato body Heat distribution Greenhouse environment growth condition

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Effects of meteorological factors on different grades of winter wheat growth in the Huang-Huai-Hai Plain, China

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Journal of Integrative Agriculture 2016年第11期15卷 2647-2657页

作者： HUANG Qing WANG Li-min CHEN Zhong-xin LIU Hang Institute of Agricultural Resources and Regional Planning Chinese Academy of Agricultural Sciences

The sown area of winter wheat in the Huang-Huai-Hai（HHH） Plain accounts for over 65% of the total sown area of winter wheat in China. Thus, it is important to monitor the winter wheat growth condition and reveal the main factors that influence its dynamics. This study assessed the winter wheat growth condition based on remote sensing data, and investigated the correlations between different grades of winter wheat growth and major meteorological factors corresponding. First, winter wheat growth condition from sowing until maturity stage during 2011–2012 were assessed based on moderate-resolution imaging spectroradiometer（MODIS） normalized difference vegetation index（NDVI） time-series dataset. Next, correlation analysis and geographical information system（GIS） spatial analysis methods were used to analyze the lag correlations between different grades of winter wheat growth in each phenophase and the meteorological factors that corresponded to the phenophases. The results showed that the winter wheat growth conditions varied over time and space in the study area. Irrespective of the grades of winter wheat growth, the correlation coefficients between the winter wheat growth condition and the cumulative precipitation were higher than zero lag（synchronous precipitation） and one lag（pre-phenophase precipitation） based on the average values of seven phenophases. This showed that the cumulative precipitation during the entire growing season had a greater effect on winter wheat growth than the synchronous precipitation and the pre-phenophase precipitation. The effects of temperature on winter wheat growth varied according to different grades of winter wheat growth based on the average values of seven phenophases. Winter wheat with a better-than-average growth condition had a stronger correlation with synchronous temperature, winter wheat with a normal growth condition had a stronger correlation with the cumulative temperature, and winter wheat with a worse-than-average growth condition had a stronger correlation with the p

关键词： growth condition meteorological factors remote sensing spatiotemporal correlation winter wheat HuangHuai-Hai（HHH） Plain region China

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Optimal growth conditions of Microorganisms Isolated from the Buyeo Royal Tomb No. 1 and Their Effects on Painting Layers

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Advances in Microbiology 2022年第9期12卷 525-540页

作者： Hyun Ju Lee Yong Jae Chung Department of Heritage Conservation and Restoration Graduate School of Cultural Heritage Korea National University of Cultural Heritage Buyeo Republic of Korea

The Buyeo Royal Tomb No. 1 is an ancient tomb built in the late 6th and early 7th century. The four walls of the main room have murals of four guardian deities, and the ceiling has murals of lotus and cloud patterns. This study assessed the optimal growth conditions of two fungal (Fusarium oxysporum, Mortierella sp.) and four bacterial (Bacillus cereus, Cupriavidus campinensis, Streptomyces avidinii, Streptomyces cirratus) strains isolated from the Tomb No. 1, along with their effects on the painting layer. The two fungi showed optimal growth at 20°C - 30°C under both nutrient and non-nutrient conditions. These strains did not decompose or discolor the three pigments (cinnabar, hematite, oyster shell white);however, M. sp. showed slight decomposition of the media (starch paste, sea weed). The four bacterial strains showed the most active growth at 20°C - 25°C under nutrient conditions and did not grow under non-nutrient conditions. These bacteria commonly degraded animal glue and sea weed components. In addition, S. cirratus degraded starch. The genus Streptomyces discolored the pigment medium to brown and black, suggesting a possible risk of discoloration of the murals. The current environment in Tomb No. 1 was sufficient for microorganism growth, and the presence of strains such as soil bacteria and actinomycetes on the mural surface may damage the murals. The findings of this study could be helpful for preserving mural tombs against biological damage caused by microorganisms that are already present or may be present in the tombs in the future. These findings also provide guidelines for comprehensive conservation management.

关键词： Ancient Mural Tomb Murals Biodeterioration Buyeo Royal Tombs growth condition Painting Layer

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POSITIVE PERIODIC SOLUTIONS OF NONLINEAR DIFFERENTIAL EQUATIONS

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Applied Mathematics(A Journal of Chinese Universities) 2003年第4期18卷 373-382页

作者： LiuYuji GeWeigao Dept.ofMath. YueyangTeacher‘sUniv.Yueyang414000China Dept.ofAppl.Math. BeijingInstituteofTechnologyBeijing100081China

The nonlinear differential equationx′(t)=-δ(t)x(t)+f(t,x(t))(*)is considered,where δ(t) is a periodic function of periodic T,f(t,x) is continuous and periodic in t.It is showed that (*) has at least two positive T-periodic solutions under certain growth conditions imposed on f.Applications will be presented to illustrate the main results.

关键词： positive periodic solution differential equation fixed-point theorem growth condition

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Effect of Physical and Nutritional Parameters on the growth of Trametes robiniophila Murr. Mycelium

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食用菌学报 2006年第4期 84-86页

作者： LI Cui-cui, GUO Li-zhong *, XU Li-li, NING Li, GONG WeiInstitute of Life Science, Laiyang Agricultural College, Qingdao, Shandong 266109, China

A study of selected physical and nutritional parameters on the growth of Trametes robiniophila Murr. revealed that the optimal temperature and pH values for mycelial growth were 25 ℃ and pH 6.0, respectively and that... 详细信息

关键词： Trametes robiniophila Mycelium growth condition

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