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Kalita, H.
- Oscillatory Mhd Free Convective Flow through a Porous Medium with Mass Transfer, Soret Effect and Chemical Reaction
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1 Dept. of Mathematics, Gauhati University, Guwahati 781014, Assam, IN
1 Dept. of Mathematics, Gauhati University, Guwahati 781014, Assam, IN
Source
Indian Journal of Science and Technology, Vol 3, No 8 (2010), Pagination: 919-924Abstract
An attempt is made to investigate the problem of an oscillatory MHD free convective flow through a porous medium with mass transfer, Soret effect and chemical reaction when the temperature as well as concentration at the plate varies periodically with time about a steady mean. Analytical solutions to the coupled non-linear equations governing the flow and heat and mass transfer are obtained by using regular perturbation technique. The influence of the different parameters entering in to the problem viz. the Hartmann number M, the Grashof number for heat transfer Gr , the Grashof number for mass transfer Gm , Soret number S0 , the plate velocity U , chemical reaction Ch etc. on temperature distribution, species concentration, velocity distribution, skin-friction and the rates of heat and mass transfer at the plate are discussed graphically.Keywords
Free Convection, MHD, Thermal Diffusion, Chemical ReactionReferences
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- Ahmed N and Kalita H (2009b) Soret and magnetic field effects on a transient free convection flow through a porous medium bounded by a uniformly moving infinite vertical porous plate in presence of a heat source. Int. J. Appl. Math. Sci. in press.
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- Tea Mosquito Bug (Helopeltis theivora) and Mealy Bug (Paraputo theaecola)-New Threats to Large Cardamom
Abstract Views :347 |
PDF Views:89
Authors
Affiliations
1 ICAR-Research Complex for NEH Region, Sikkim Centre, Tadong 737 102, IN
1 ICAR-Research Complex for NEH Region, Sikkim Centre, Tadong 737 102, IN
Source
Current Science, Vol 110, No 8 (2016), Pagination: 1390-1391Abstract
Large cardamom (Amomum subulatum), a member of the family Zingiberaceae under order Scitaminae, is the most important cash crop in the eastern Himalayan region including Sikkim and the Darjeeling hills in India, the eastern part of Nepal and southern Bhutan.- Does Pestalotiopsis royenae Cause Leaf Streak of Large Cardamom?
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PDF Views:102
Authors
Affiliations
1 ICAR-National Organic Farming Research Institute, (Formerly ICAR Research Complex for NEH Region, Sikkim Centre), Tadong, Gangtok 737 102, IN
1 ICAR-National Organic Farming Research Institute, (Formerly ICAR Research Complex for NEH Region, Sikkim Centre), Tadong, Gangtok 737 102, IN
Source
Current Science, Vol 114, No 10 (2018), Pagination: 2155-2160Abstract
Leaf streak caused by Pestalotiopsis royenae (Guba) Steyaert has been reported as a new disease of large cardamom (Amomum subulatum). It is characterized by rectangular spots running parallel to the veins. P. royenae was isolated onto potato dextrose agar from the infected portion of the plant. In the pathogenicity test, disease symptoms were not present on inoculated plant and on detached leaf in vitro after 20 days. During 2014–2016, a survey in various large cardamom plantations of Sikkim revealed the presence of tea mosquito bugs on the infected parts of A. subulatum. The spots did not show any growth. Different sized spots have been noticed on the infected leaf produced by different instars. At the initial stage, these symptoms appear on the young and tender leaves of large cardamom. Tea mosquito bugs were collected from the infested leaves and allowed to feed under controlled conditions, which produced similar type of leaf streak symptoms in large cardamom and also in other non-host crops like maize and turmeric. The results reveal that the cause of leaf streak is due to feeding injury of tea mosquito bugs and rule out P. royenae as a pathogen causing leaf streak disease symptoms. Pestalotiopsis sp. was also isolated as endophyte from large cardamom.Keywords
Helopeltis theivora, Large Cardamom, Leaf Streak, Pestalotiopsis royenae.References
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