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Chakrabarti, Satadal,Manna, Buddhadeb Korean Society of Sericultural Science 2008 International Journal of Industrial Entomology Vol.17 No.1
Infection of pathogenic microsporidia, Nosema bombycis and Nosema mylitta (Chakrabarti and Manna, 2006) decreased egg production, fecundity, hatching % and increased sterile eggs in heavily infected mulberry silkmoth, Bombyx mori L. On an average a disease free moth laid upto 442.67 eggs with high hatching % (99.53) and less sterile eggs ($0.47{\sim}2.00%$). While an infected moth laid less number of eggs ($7.00{\sim}412.00$) with low hatching % ($32.437{\sim}98.643$) and high sterile eggs ($2.143{\sim}129.571$). Fecundity of disease free laying was highest (468.714) during season-1 then gradually decreased during season- 2 (414.000) to season- 3 (404.285). But fecundity of an infected laying was highest during season-2 and hatched eggs were lowest during season-2. Higher inoculums concentration of N. mylitta infected to 5th stage larva of mulberry silkworm drastically decreased the fecundity in season - 3 and lower inoculums concentration of N. bombycis decreased the fecundity in season-1 and 3. Season-3 was most effective season to decrease the fecundity and increase sterile eggs when both temperature and humidity were fluctuated from the optimum level.
( Satadal Chakrabarti ),( Buddhadeb Manna ) 한국잠사학회 2008 International Journal of Industrial Entomology Vol.17 No.1
Infection of pathogenic microsporidia, Nosema bombycis and Nosema mylitta (Chakrabarti and Manna, 2006) decreased egg production, fecundity, hatching % and increased sterile eggs in heavily infected mulberry silkmoth, Bombyx mori L. On an average a disease free moth laid upto 442.67 eggs with high hatching % (99.53) and less sterile eggs (0.47~2.00%). While an infected moth laid less number of eggs (7.00~412.00) with low hatching % (32.437~98.643) and high sterile eggs (2.143~129.571). Fecundity of disease free laying was highest (468.714) during season-1 then gradually decreased during season-2 (414.000) to season-3 (404.285). But fecundity of an infected laying was highest during season-2 and hatched eggs were lowest during season-2. Higher inoculums concentration of N. mylitta infected to 5th stage larva of mulberry silkworm drastically decreased the fecundity in season -3 and lower inoculums concentration of N. bombycis decreased the fecundity in season-1 and 3. Season-3 was most effective season to decrease the fecundity and increase sterile eggs when both temperature and humidity were fluctuated from the optimum level.
Chakrabarti, Satadal,Manna, Buddhadeb Korean Society of Sericultural Science 2008 International Journal of Industrial Entomology Vol.17 No.2
The influence of temperature and relative humidity in infection and cross-infection of Nosema bombycis and N. mylitta respectively in mulberry silkworm, Bombyx mori L. on larval mortality, multiplication of pathogens, larval weight and growth rate in three different seasons were studied. Seasons were selected in such condition, when very less fluctuations between minimum and maximum temperature and minimum and maximum relative humidity ($25{\sim}28^{\circ}C$ and $65{\sim}72%$ R.H) was observed i.e., season-1. Fluctuations between minimum and maximum temperature were less ($28.05{\sim}34.50^{\circ}C$) but R.H % was more ($55{\sim}81%$) in season-2. Fluctuations between minimum and maximum temperature and R.H % were more ($20.00{\sim}40.5^{\circ}C$ and $64.00{\sim}90.00%$) in season-3. Growth rate of microsporidian-infected silkworm is directly related to the prevailing temperature and relative humidity in silkworm. Silkworm can tolerate slight variation of temperature but slight variation of relative humidity disfavours the development of silkworm and favours the multiplication of pathogens.
Chakrabarty, Satadal,Saha, A.K.,Manna, B.,Kumar, S. Nirmal Korean Society of Sericultural Science 2013 International Journal of Industrial Entomology Vol.27 No.2
In nature, the population of Nosema bombycis (Microsporidia) causing pebrine disease is small and their development is extremely slow and only few ultimately producing spores. Pebrine infected silkworm, Bombyx mori larvae collected from sericulture field were alive till $3^{rd}$ generation though the concentration of N.bombycis spore was very high ($2.4-3.0{\times}10^8$ spores. $mL^{-1}$). All larvae were died during $4^{th}$ generation with extremely high concentration of pebrine spores ($3.0-4.0{\times}10^9$ spores. $mL^{-1}$) and mostly contain long polar tube (LT). Alternately, all larvae were died immediately (at $3^{rd}$ stage of $1^{st}$ generation) when it was artificially inoculated with same concentration of N.bombycis spores harvested from field ($2.4-3.0{\times}10^8$ spores. $mL^{-1}$) though concentration of spores harvest was very less ($3.0-4.0{\times}10^6$ spores. $mL^{-1}$) and mostly contain short polar tube (ST). Artificially pebrine infected male moth when mated with healthy female moth took six generations to develop pebrine disease and all larvae were died at the $2^{nd}$ stage with very less spore harvest ($3.0-10.0{\times}10^6$ spores. $mL^{-1}$). Survival percentage was increased in all generations (~92.0% at $4^{th}$ generation) when silkworm rearing was conducted under new integrated disease management system.
Large Deflections of a Clamped Circular Plate Pressed by a Hemispherical - Headed Punch
Chakrabarty, J . 대한금속재료학회(대한금속학회) 1998 METALS AND MATERIALS International Vol.4 No.4
A new method of analysis based on the consideration of equilibrium and a physically acceptable displacement field is proposed in this paper to investigate the fully plastic behaviour of a clamped circular plate which is loaded axisymmetrically by a rigid hemispherical-headed punch. The attention is confined to the range of loads for which the central deflection of the plate exceeds the plate thickness, and the effect of the induced membrane forces is duly allowed for in the theoretical framework to obtain a realistic expression for the load-deflection relation in the plastic range. When the central deflection becomes sufficiently large, the deformation of the plate occurs essentially under membrane stresses alone, and the analysis then becomes similar to the one presented earlier by the author for a material that work-hardens isotropically according to the Ludwik power law. Since the considered range of deflections is sufficiently large, the material is assumed to be rigid/plastic, and the work-hardening of the material is disregarded as a necessary first step towards a more general solution. The complete load-deflection relation is presented in a graphical form for the situation where the punch radius is equal to the radius of the plate.
Chakrabarti, Arijit,Chakraborty, Avijit,Sadhu, Pradip Kumar The Korean Institute of Power Electronics 2017 JOURNAL OF POWER ELECTRONICS Vol.17 No.6
The Proportional-Integral-Derivative (PID) controller is still the most widespread control strategy in the industry. PID controllers have gained popularity due to their simplicity, better control performance and excellent robustness to uncertainties. This paper presents the optimal tuning of a PID controller for domestic induction heating systems with a series resonant inverter for controlling the induction heating power. The objective is to design a stable and superior control system by tuning the PID controller with a derivative filter (PIDF) through Fuzzy logic. The paper also compares the performance of the Fuzzy PIDF controller with that of a Ziegler-Nichols PID controller and a fine-tuned PID controller with a derivative filter. The system modeling and controllers are simulated in MATLAB/SIMULINK. The results obtained show the effectiveness and superiority of the proposed Fuzzy PID controller with a derivative filter.