http://chineseinput.net/에서 pinyin(병음)방식으로 중국어를 변환할 수 있습니다.
변환된 중국어를 복사하여 사용하시면 됩니다.
Screening of botanicals against the adults of rice weevil, Sitophilus oryzae L.
S. Rajashekara,R. Kiran,V. Bhavya,C. Chithrashree,V. Chaitra,Deepti Ravi Joshi,M. G. Venkatesha 한국잠사학회 2023 International Journal of Industrial Entomology Vol.47 No.1
Sitophilus oryzae L. (Rice Weevil) is a stored pest of rice that causes extensive loss throughout the world. We tested the leaf powders of 12 plant species viz., Chrysanthemum sp., Cinnamomum zeylanicum, Citrus grandis, Citrus limon, Gliricidia sepium, Gymnema sylvestre, Hemigraphis colorata, Michelia champaca, Moringa oleifera, Murraya koenigii, Polyalthia longifolia, and Sauropus androgynus at dosages of 1.00, 1.50, 2.00 and 3.00g against the adult rice weevil and mortality was recorded at 1, 2, 3, 5, 7, 12 and 2l days after treatment (DAT) by direct contact toxicity for their adulticidal effect. We observed 100 percent adult mortality in C. zevlanicum and M. koenigii among the tested leaf powders. In addition, the first-time tested H. colorata and S. androgynus also caused high mortality compared to other plants. All the plant powders caused moderate to high adult mortality. Hence, these plants could be effective botanical insecticides against S. oryzae as they comprise a potential source of bioactive chemicals and are generally free from toxicants. Applications of these natural derivatives in S. oryzae control could reduce the cost of control methods and storage of rice contamination. Therefore, the present study indicates that some plant extracts can be used as an alternative to toxic synthetic chemicals in the management of rice weevils.
Venkatesha M. G. Korean Society of Applied Entomology 2006 Journal of Asia-Pacific Entomology Vol.9 No.3
The outbreak of Henosepilachna vigintioctopunctata (F.) was noticed on a medicinal plant, Withania somnifera Dunal during 2004-05. The population level of the pest was reached its peak in August. The parasitoid Pediobius foveolatus caused $51.94%{\pm}12.20%$ parasitism. The pest completed its life cycle in $20.15{\pm}1.50$ days on W. somnifera. The longevity of the male and female adults of the pest was $22.07{\pm}3.71\;and\;31.07{\pm}4.38$ days, respectively. The gravid females of H. vigintioctopunctata laid an average of $287.64{\pm}33.38$ eggs during their oviposition period of $10.40{\pm}2.80$ days.
M. G. Venkatesha 한국응용곤충학회 2006 Journal of Asia-Pacific Entomology Vol.9 No.3
The outbreak of Henosepilachna vigintioctopunctata (F.) was noticed on a medicinal plant, Withania somnifera Dunal during 2004-05.The population level of the pest was reached its peak in August. The parasitoid Pediobius foveolatus caused 51.94%±12.20% parasitism. The pest completed its life cycle in 20.15±1.50 days on W. somnifera. The longevity of the male and female adults of the pest was 22.07±3.71 and 31.07±4.38 days, respectively. The gravid females of H. vigintioctopunctata laid an average of 287.64±33.38 eggs during their oviposition period of 10.40±2.80 days.
Design modification and structural behavior study of a CFRP star sensor baffle
Vinyas, M.,Vishwas, M.,Venkatesha, C.S.,Rao, G. Srinivasa Techno-Press 2016 Advances in aircraft and spacecraft science Vol.3 No.4
Star sensors are the attitude estimation sensors of the satellite orbiting in its path. It gives information to the control station on the earth about where the satellite is heading towards. It captures the images of a predetermined reference star. By comparing this image with that of the one captured from the earth, exact position of the satellite is determined. In the process of imaging, stray lights are eliminated from reaching the optic lens by the mechanical enclosures of the star sensors called Baffles. Research in space domain in the last few years is mainly focused on increased payload capacity and reduction in launch cost. In this paper, a star sensor baffle made of Aluminium is considered for the study. In order to minimize the component weight, material wastage and to improve the structural performance, an alternate material to Aluminium is investigated. Carbon Fiber Reinforced Polymer is found to be a better substitute in this regard. Design optimisation studies are carried out by adopting suitable design modifications like implementing an additional L-shaped flange, Upward flange projections, downward flange projections etc. A better configuration of the baffle, satisfying the design requirements and achieving manufacturing feasibility is attained. Geometrical modeling of the baffle is done by using UNIGRAPHICS-Nx7.5(R). Structural behavior of the baffle is analysed by FE analysis such as normal mode analysis, linear static analysis, and linear buckling analysis using MSC/PATRAN(R), MSC-NASTRAN(R) as the solver to validate the stiffness, strength and stability requirements respectively. Effect of the layup sequence and the fiber orientation angle of the composite layup on the stiffness are also studied.