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Articles by A.K. Saha
Total Records ( 4 ) for A.K. Saha
  N.B. Sparks and A.K. Saha
  This study presents a review of the IEC 61850 substation protocol and its implications for communication in both modern and legacy-based protection schemes. The intelligent substation devices of today have the ability to communicate, interface and interoperate using ethernet-based protocols like the IEC 61850 standard. This has promoted an industry shift from the outdated serial and legacy protection schemes which rely on binary and analog hardwire connections between device to an ethernet-based architecture. Therefore, the IEC 61850 protocol affects the way substations are designed how IEDs are interfaced, the manner in which devices communicate and the overall effectiveness and efficiency of a substation. However, this new standard also presents a fresh set rules to engineers and utilities alike. These define the manner in which IEDs are configuration as well as how they communicate with other devices using a newly established peer to peer message system. Thus, the continued collaboration of the International Electrotechnical Commission has resulted in the development of a communication standard that allows IEDs of different manufacturers to interact within the local substation environment and transfer data and signals quickly over a ‘virtual’ ethernet-based network.
  A.B.M. Shahinuzzaman , A.K. Saha , A.C. Mazumder , S. Das , M.A. Sufian , M.A. Baki and M.M. Hossain
  The research work was conducted to study the sequential pathological changes of Pullorum Disease (PD) and immunohistochemical detection of its causal agent (Salmonella pullorum) in various tissues of experimentally infected chicks. Total 40 day old (D0) chicks were divided into experimental and control groups. The chicks were infected at day 15 (D15) of age by oral route with 1 ml of 2 x 108 CFU of S. pullorum. Chicks were sacrificed at day 1 (D1), day 3 (D3), day 5 (D5), day 7 (D7) and day 9 (D9) of Post Infection (PI) and observed the remarkable gross lesions in liver, lung, heart and cecum. Grossly, liver found fragile (40%) at D7 and D9. Cheesy materials in cecum (20%) showed at D9. The highest reisolation of S. pullorum demonstrated in cecum (68%). Histopathologically, nodular lesion in liver developed at D7 (20%) and D9 (40%). Hepatitis from D1 (20%) and continued upto D9 (60%). Pneumonia and bronchopneumonia along with inflammatory cells in lung were observed at D1 (20%) that continued upto D9 (80%). Spleen showed depletion of lymphocytes at D7 (40%) and D9 (60%). Typhlitis in cecum noticed at D5 (20%) and remained up to at D9 (40%). Congestion and hemorrhage was common in organs at early times and gradually reduced both in grossly and histopathologically thereafter. Immunohistochemistry revealed S. pullorum bacteria in the cytoplasm of hepatocytes of liver, in the cytoplasm of epithelia of cecum (D3, D7) and in the cytoplasm of epithelia of crop (D3).
  Satadal Chakrabarty , B. Manna , A.K. Saha and B.B. Bindroo
  The spore production of Nosema sp. in mulberry silkworm, Bombyx mori and non-mulberry silkworms, tasar, Antheraea mylitta D.; Eri, Philosamia ricini B. and muga, Antheraea assama Ww. were examined and found that spore multiplication in the host followed a logistic pattern of development. Inoculum concentrations of Nosema sp. during various seasons is the most important factor for the development of pebrine disease in mulberry and non-mulberry silkworms. Mean larval mortality in mulberry silkworm was high (90.00%) when larvae inoculated with low concentration (1.52x106 spores mL-1) of N. bombycis and it was low (66.48%) during March-April and gradually decreased during December-January (28.85%) and May-June (25.21%), respectively. The spore multiplication reaches its peak maximally in moth stage (2.67x108 spores mL-1). However, the rate of multiplication of pathogen decreased (2.0x108 and 1.4x108 spores mL-1) with the higher inoculum concentrations of pathogen (1.52x108 and 1.52x107 spores mL-1) respectively. The high larval mortality (85.00%) was recorded in A. mylitta during cross-infection with high dose (1.52x108 spores mL-1) of N. assamensis as compared to same dose of N. bombycis and N. mylitta and mean seasonal mortality was high during August-September (73.95%) followed by October-November (63.55%). Generally, larval mortality in A.mylitta was recorded high (61.44-85.00%) irrespective of variation in pathogen, inoculum concentrations and seasons. Maximum larval mortality was recorded in 3rd instar (39.44%) and 4th instar (20.55%), respectively. Multiplication of N. mylitta in moth stage was high (4.0x109 spores mL-1) in comparison to any stage of larva or pupa, when inoculation was done at 1st instar. Mortality in eri larvae with the infection of N. ricini and cross-infection with N. bombycis, N. mylitta, N. assamensis were not observed even after 3rd successive inoculation with high doses (1.52x108 spores mL-1) of above pathogens. Mortality percentage was found always high (52.00-100%) in muga larvae infected by N. bombycis, N. mylitta, N. ricini and N. assamensis during August-September in comparison to October-November.
  A.K. Saha , M. Khan , G. Nahar and F. Yesmin
  Experiments were conducted to evaluate the impact of different natural hosts and artificial adult diets on the pupal quality, adult emergence, ovariole number and longevity of the melon fly, Bactrocera cucurbitae (Coquillett) for two generations under laboratory condition. Pupal quality and percentage adult emergence was slightly higher in F2 generation than F1 generation from all tested hosts. B. cucurbitae fed on proteose-peptone sugar (1:4) produced twice as many as eggs when fed on yeast:sugar (1:3). The differences in fecundity can be explained by the higher number of ovarioles and source of protein ingested. Highly significant interaction between adult diets and natural hosts was observed in terms of ovariole number of B. cucurbitae. Experimental results indicated the importance of understanding the genetic traits in the variation of ovariole number among natural populations of the fly spp.
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