The Experts below are selected from a list of 360 Experts worldwide ranked by ideXlab platform
R Z Wang - One of the best experts on this subject based on the ideXlab platform.
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low temperature Grain Storage with a solar powered adsorption chiller a case study
International Journal of Green Energy, 2014Co-Authors: R Z Wang, Jiamin ShenAbstract:Solar energy refrigeration is very attractive for low-temperature Grain Storage because the cooling load of low-temperature Grain Storage is roughly in phase with solar energy availability. In this study, a solar-powered adsorption chiller was developed with aim of developing an alternative refrigeration device for low-temperature Grain Storage. The solar-powered adsorption chiller was put into experimental operation during summer and autumn. Test results show that the solar-powered adsorption chiller can produce a cooling capacity about 66–90 W per m2 collector area. Its daily solar-cooling COP (coefficient of performance) is about 0.1–0.13 under the climatic conditions of daily solar radiation being about 16–21 MJ/m2·day. With appropriate ventilation appliance, this kind of solar-powered adsorption chiller could be considered as an alternative for low-temperature Grain Storage in most areas of China.
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an efficient solar powered adsorption chiller and its application in low temperature Grain Storage
Solar Energy, 2007Co-Authors: R Z Wang, J Y Wu, J. M. Shen, B. B. ZhangAbstract:Abstract A novel solar-powered adsorption cooling system for low-temperature Grain Storage has been built, which consists of a solar-powered water heating system, a silica gel–water adsorption chiller, a cooling tower and a fan coil unit. The adsorption chiller is composed of two identical adsorption units, each of them containing an adsorber, a condenser, and an evaporator/receiver. The two water evaporators have been incorporated into one methanol evaporator by the use of the concept of a gravity heat pipe. In order to improve the system efficiency and achieve continuous cooling production, the adsorbers are operated out-of-phase, and heat and mass recovery processes have been used. During the period from July to September of 2004, the system was put into experimental operation to cool the headspace (i.e., the air volume above the Grain) of a Grain bin. Three months of operation showed promising performance. The chiller had a cooling power between 66 and 90 W per m2 of collector surface, with a daily solar cooling coefficient of performance (COPsolar) ranging from 0.096 to 0.13. The electric cooling COP was between 2.6 and 3.4.
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study of a solar powered solid adsorption desiccant cooling system used for Grain Storage
Renewable Energy, 2002Co-Authors: Yanjun Dai, R Z WangAbstract:A hybrid solar cooling system, which combines the technologies of rotary desiccant dehumidification and solid adsorption refrigeration, has been proposed for cooling Grain. The key components of the system are a rotary desiccant wheel and a solar adsorption collector. The former is used for dehumidification and the later acts as both an adsorption unit and a solar collector. The heating load from sunshine can thus be reduced to a greater extent since the solar adsorption collector is placed on the roof of the Grain depot. Compared with the solid adsorption refrigeration system alone, the new hybrid system performs better. Under typical conditions, the coefficient of performance of the system is >0.4 and the outlet temperature is <20°C. It is believed that the system can be used widely in the regions with abundant solar resources due to such advantages as environmental protection, energy saving and low operation costs. Additionally, some parameters, for example, ambient conditions, the effectiveness of the heat exchanger and evaporative cooler, mass air-flow rate, etc., which affect system performance, are also analyzed.
Michelle A. Rafter - One of the best experts on this subject based on the ideXlab platform.
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Behaviour in the presence of resource excess—flight of Tribolium castaneum around heavily-infested Grain Storage facilities
Journal of Pest Science, 2019Co-Authors: Michelle A. Rafter, V. Muralitharan, Gregory J. Daglish, Saisrinivasan Mohankumar, Mayura Loganathan, S. Chandrasekaran, G. H. WalterAbstract:The flight of Tribolium castaneum (Herbst) in leaving infestations and establishing new infestations, independent of human mediation, has received little experimental attention. This study focuses on the patterns of flight of T. castaneum beetles in the nearby vicinity of an environment that provides all requirements—that is, an environment from which the beetles are not likely to be driven by density-related pressures. Four separate sampling strategies were implemented, with each one focused on particular sites in and around Storage structures (godowns) in southern India. Additional beetles were sampled from each focus area of a Storage facility at dusk to ascertain the allelic frequencies of resident and flying beetles at the rph 2 gene which is partially responsible for resistance to the fumigant phosphine (PH_3). Results show that T. castaneum beetles clearly have a crepuscular flight pattern, with most flight occurring at dusk. Movement into and out of the facilities sampled evidently balanced one another, indicating that those beetles that initiated flight must eventually have returned to the same resource. Most beetles sampled from the bag stack surface during this crepuscular flight period were homozygous phosphine resistant at the rph 2 locus (83.3%, n = 30). Conversely, most beetles caught in flight during the same period had at least one phosphine susceptible allele (86.7% above the back stack, 63.3% outside the godown n = 30 at each site). Explanations for the patterns observed are discussed, including resource abundance overriding dispersal flight, and the possible pleiotropic effects on flight propensity of phosphine resistance.
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behaviour in the presence of resource excess flight of tribolium castaneum around heavily infested Grain Storage facilities
Journal of Pest Science, 2019Co-Authors: V. Muralitharan, Michelle A. Rafter, Gregory J. Daglish, Saisrinivasan Mohankumar, Mayura Loganathan, S. Chandrasekaran, G. H. WalterAbstract:The flight of Tribolium castaneum (Herbst) in leaving infestations and establishing new infestations, independent of human mediation, has received little experimental attention. This study focuses on the patterns of flight of T. castaneum beetles in the nearby vicinity of an environment that provides all requirements—that is, an environment from which the beetles are not likely to be driven by density-related pressures. Four separate sampling strategies were implemented, with each one focused on particular sites in and around Storage structures (godowns) in southern India. Additional beetles were sampled from each focus area of a Storage facility at dusk to ascertain the allelic frequencies of resident and flying beetles at the rph2 gene which is partially responsible for resistance to the fumigant phosphine (PH3). Results show that T. castaneum beetles clearly have a crepuscular flight pattern, with most flight occurring at dusk. Movement into and out of the facilities sampled evidently balanced one another, indicating that those beetles that initiated flight must eventually have returned to the same resource. Most beetles sampled from the bag stack surface during this crepuscular flight period were homozygous phosphine resistant at the rph2 locus (83.3%, n = 30). Conversely, most beetles caught in flight during the same period had at least one phosphine susceptible allele (86.7% above the back stack, 63.3% outside the godown n = 30 at each site). Explanations for the patterns observed are discussed, including resource abundance overriding dispersal flight, and the possible pleiotropic effects on flight propensity of phosphine resistance.
G. H. Walter - One of the best experts on this subject based on the ideXlab platform.
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Behaviour in the presence of resource excess—flight of Tribolium castaneum around heavily-infested Grain Storage facilities
Journal of Pest Science, 2019Co-Authors: Michelle A. Rafter, V. Muralitharan, Gregory J. Daglish, Saisrinivasan Mohankumar, Mayura Loganathan, S. Chandrasekaran, G. H. WalterAbstract:The flight of Tribolium castaneum (Herbst) in leaving infestations and establishing new infestations, independent of human mediation, has received little experimental attention. This study focuses on the patterns of flight of T. castaneum beetles in the nearby vicinity of an environment that provides all requirements—that is, an environment from which the beetles are not likely to be driven by density-related pressures. Four separate sampling strategies were implemented, with each one focused on particular sites in and around Storage structures (godowns) in southern India. Additional beetles were sampled from each focus area of a Storage facility at dusk to ascertain the allelic frequencies of resident and flying beetles at the rph 2 gene which is partially responsible for resistance to the fumigant phosphine (PH_3). Results show that T. castaneum beetles clearly have a crepuscular flight pattern, with most flight occurring at dusk. Movement into and out of the facilities sampled evidently balanced one another, indicating that those beetles that initiated flight must eventually have returned to the same resource. Most beetles sampled from the bag stack surface during this crepuscular flight period were homozygous phosphine resistant at the rph 2 locus (83.3%, n = 30). Conversely, most beetles caught in flight during the same period had at least one phosphine susceptible allele (86.7% above the back stack, 63.3% outside the godown n = 30 at each site). Explanations for the patterns observed are discussed, including resource abundance overriding dispersal flight, and the possible pleiotropic effects on flight propensity of phosphine resistance.
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behaviour in the presence of resource excess flight of tribolium castaneum around heavily infested Grain Storage facilities
Journal of Pest Science, 2019Co-Authors: V. Muralitharan, Michelle A. Rafter, Gregory J. Daglish, Saisrinivasan Mohankumar, Mayura Loganathan, S. Chandrasekaran, G. H. WalterAbstract:The flight of Tribolium castaneum (Herbst) in leaving infestations and establishing new infestations, independent of human mediation, has received little experimental attention. This study focuses on the patterns of flight of T. castaneum beetles in the nearby vicinity of an environment that provides all requirements—that is, an environment from which the beetles are not likely to be driven by density-related pressures. Four separate sampling strategies were implemented, with each one focused on particular sites in and around Storage structures (godowns) in southern India. Additional beetles were sampled from each focus area of a Storage facility at dusk to ascertain the allelic frequencies of resident and flying beetles at the rph2 gene which is partially responsible for resistance to the fumigant phosphine (PH3). Results show that T. castaneum beetles clearly have a crepuscular flight pattern, with most flight occurring at dusk. Movement into and out of the facilities sampled evidently balanced one another, indicating that those beetles that initiated flight must eventually have returned to the same resource. Most beetles sampled from the bag stack surface during this crepuscular flight period were homozygous phosphine resistant at the rph2 locus (83.3%, n = 30). Conversely, most beetles caught in flight during the same period had at least one phosphine susceptible allele (86.7% above the back stack, 63.3% outside the godown n = 30 at each site). Explanations for the patterns observed are discussed, including resource abundance overriding dispersal flight, and the possible pleiotropic effects on flight propensity of phosphine resistance.
Zhi Wei Deng - One of the best experts on this subject based on the ideXlab platform.
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insecticidal activity of essential oil of carum carvi fruits from china and its main components against two Grain Storage insects
Molecules, 2010Co-Authors: Rui Fang, Cai Hong Jiang, Xiu Yi Wang, Hai Ming Zhang, Zhi Long Liu, Ligang Zhou, Zhi Wei DengAbstract:During our screening program for agrochemicals from Chinese medicinal herbs and wild plants, the essential oil of Carum carvi fruits was found to possess strong contact toxicity against Sitophilus zeamais and Tribolium castaneum adults, with LD50 values of 3.07 and 3.29 mg/adult, respectively, and also showed strong fumigant toxicity against the two Grain Storage insects with LC50 values of 3.37 and 2.53 mg/L, respectively. The essential oil obtained by hydrodistillation was investigated by GC and GC-MS. The main components of the essential oil were identified to be (R)-carvone (37.98%) and D-limonene (26.55%) followed by α-pinene (5.21), cis-carveol (5.01%) and b-myrcene (4.67%). (R)-Carvone and D-limonene were separated and purified by silica gel column chromatography and preparative thin layer chromatography, and further identified by means of physicochemical and spectrometric analysis. (R)-Carvone and D-limonene showed strong contact toxicity against S. zeamais (LD50 = 2.79 and 29.86 mg/adult) and T. castaneum (LD50 = 2.64 and 20.14 mg/adult). (R)-Carvone and D-limonene also possessed strong fumigant toxicity against S. zeamais (LC50 = 2.76 and 48.18 mg/L) and T. castaneum adults (LC50 = 1.96 and 19.10 mg/L).
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insecticidal activity of essential oil of carum carvi fruits from china and its main components against two Grain Storage insects
Molecules, 2010Co-Authors: Rui Fang, Cai Hong Jiang, Xiu Yi Wang, Hai Ming Zhang, Zhi Long Liu, Ligang Zhou, Zhi Wei DengAbstract:Abstract: During our screening program for agrochemicals from Chinese medicinal herbs and wild plants, the essential oil of Carum carvi fruits was found to possess strong contact toxicity against Sitophilus zeamais and Tribolium castaneum adults, with LD 50 values of 3.07 and 3.29 g/adult, respectively, and also showed strong fumigant toxicity against the two Grain Storage insects with LC 50 values of 3.37 and 2.53 mg/L, respectively. The essential oil obtained by hydrodistillation was investigated by GC and GC-MS. The main components of the essential oil were identified to be ( R )-carvone (37.98%) and D- limonene (26.55%) followed by α-pinene (5.21), cis -carveol (5.01%) and -myrcene (4.67%). ( R )-Carvone and D- limonene were separated and purified by silica gel column chromatography and preparative thin layer chromatography, and further identified by means of physicochemical and spectrometric analysis. ( R )-Carvone and D- limonene showed strong contact toxicity against S. zeamais
B. B. Zhang - One of the best experts on this subject based on the ideXlab platform.
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an efficient solar powered adsorption chiller and its application in low temperature Grain Storage
Solar Energy, 2007Co-Authors: R Z Wang, J Y Wu, J. M. Shen, B. B. ZhangAbstract:Abstract A novel solar-powered adsorption cooling system for low-temperature Grain Storage has been built, which consists of a solar-powered water heating system, a silica gel–water adsorption chiller, a cooling tower and a fan coil unit. The adsorption chiller is composed of two identical adsorption units, each of them containing an adsorber, a condenser, and an evaporator/receiver. The two water evaporators have been incorporated into one methanol evaporator by the use of the concept of a gravity heat pipe. In order to improve the system efficiency and achieve continuous cooling production, the adsorbers are operated out-of-phase, and heat and mass recovery processes have been used. During the period from July to September of 2004, the system was put into experimental operation to cool the headspace (i.e., the air volume above the Grain) of a Grain bin. Three months of operation showed promising performance. The chiller had a cooling power between 66 and 90 W per m2 of collector surface, with a daily solar cooling coefficient of performance (COPsolar) ranging from 0.096 to 0.13. The electric cooling COP was between 2.6 and 3.4.
