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Showing 2 results for hamrahi
Volume 11, Issue 2 (7-2022)
Abstract
The black bean aphid, Aphis fabae Scopoli, is a critical pest feeding on various host plants. This study was conducted to investigate the effect of kaolin on A. fabae and one of its natural enemies, Hippodamia variegata (Goeze). The investigation was carried out in Barkat broad bean cultivar during 2017-2019 in field and greenhouse conditions in Karaj, Iran. The experiment was conducted as a factorial randomized complete block design with four replications. Kaolin (Sepidan® WP %95) was tested at 3, 6, and 9%, and the sampling was carried out one day before application and three, six, nine, twelve, and fifteen days after application. As soon as the insects settled, kaolin foliar application began. The laboratory tests on black bean aphid showed the highest efficiency of kaolin 9% at 12 days after application, while the least was three days after application with kaolin 3%. Field trials indicated the highest efficiency of kaolin 9%, 9 days after application. Kaolin 9% caused the highest detrimental impact on H. variegata 15 days after foliar application.
Shahab Eldin hamrahi, Koorosh Goudarzi, Mahmood Yaghoubi, Mehrorang Ghaedi,
Volume 17, Issue 11 (1-2018)
Abstract
The goal of this research is to design and build a solar adsorption chiller operated by activated carbon / methanol. Continuous refrigeration systems are able to produce cooling continuously. This paper examines the effect of activated carbon particles on the performance of a continuous adsorption chiller device. The source of this chiller is through sunlight and supplied by a parabolic collector that does not need to track sunlight. The system operates with two adsorbent beds that, when one is adsorbed, the other is desorbed. The experiments were carried out in Yasuj during three different days in the month of Bahman for three hot water input to the chiller 38℃, 34℃ and 30℃. The average ambient temperature during the experiment is 18℃. Experimental results shows that for the total energy input, 13MJm-2, the average performance factor of the chiller is when the inlet temperature of the hot water of the chiller is 38℃, 34℃ and 30℃, respectively, of 0.123, 0.103 and 0.10. For Previous temperatures the average specific cooling power of the device was obtained at 88Wkg-1, 65Wkg-1 and 50Wkg-1 respectively.
