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( Kunal Sarkar ),( Manmatha Mandal ),( Shanmugam Manthira Moorthy ) 한국잠사학회 2009 International Journal of Industrial Entomology Vol.19 No.2
The effect of mating duration and multiple use of male on fecundity and fertility was investigated in the hybrids of Silkworm, Bombyx mori L. One hour to five hours of mating duration did not affect egg laying (fecundity) significantly, while fertilization affected significantly. Below 50% fertility was noticed when mating duration was reduced to below two hours. Similarly multiple use of male caused significant reduction in fertility but not fecundity. Till fourth mating no significant reduction in fertility was observed, thereafter fertility reduced considerably.
Sarkar, Kunal,Mandal, Manmatha,Moorthy, Shanmugam Manthira Korean Society of Sericultural Science 2009 International Journal of Industrial Entomology Vol.19 No.2
The effect of mating duration and multiple use of male on fecundity and fertility was investigated in the hybrids of Silkworm, Bombyx mori L. One hour to five hours of mating duration did not affect egg laying (fecundity) significantly, while fertilization affected significantly. Below 50% fertility was noticed when mating duration was reduced to below two hours. Similarly multiple use of male caused significant reduction in fertility but not fecundity. Till fourth mating no significant reduction in fertility was observed, thereafter fertility reduced considerably.
( Vinod B. Mathur ),( Kunal Sarkar ) 한국잠사학회 2008 International Journal of Industrial Entomology Vol.16 No.1
The present study was carried out with the aim to evaluate the viability of layings (delivery of fertilized and unfertilized eggs) with egg laying duration of elite bivoltine races. The temporal aspect of mating in terms of egg layings duration may also have impact on the number of eggs laid, pattern of egg laying and their viability. After different interval of egg laying duration, moth of Bombyx mori are removed from oviposition site after they have completed egg laying. Present investigation confirmed that there are no significant difference in relation to the occurrence of viable (fertilized) and non viable (unfertilized) eggs and duration of oviposition. Percentage of unfertilized eggs varied from 2.41 to 3.42% in case of CSR-3, 2.59 to 3.62% in case of CSR-6, 2.82 to 3.66% in case of CSR-16 and 2.58 to 3.40% in case of CSR-17 in different treatments. The occurrence of unfertilized eggs are also not significant in the different treatments specially in those eggs which were laid 24 hours after oviposition and kept for 4 months hibernation schedule.
Hitensinh Vaghela,Vikas Lakhera,Kunal Bhatt,Biswanath Sarkar 한국초전도저온공학회 2021 초전도와 저온공학 Vol.23 No.4
The Cable in Conduit Conductor (CICC) configurations are designed, tested and realized to make high field superconducting (SC) magnets. The evolution of CICC design makes it challenging to forecast thermo-hydraulic behavior. A common objective of thermo-hydraulic studies is to obtain the most reliable predictive correlation for friction factor in CICC geometries and to reduce the dependency on the experiment. So far, only the void fraction and Reynolds number have been considered in the predictive correlations in an explicit way. In the present paper, the CICC twisting pattern dependency, called tortuosity (), on the pressure drop prediction, has been assessed through a numerical simulation approach. The CICC twisting pattern with 6+1 petals (solid conductor in the present study) with different twisting pitches is mimicked in the numerical simulation for the range 100 ≤ Re ≤10000 and 1 < < 1.08 and a correlation for friction factor, f, has been proposed as a function of Re and .
Mathur, Vinod B.,Sarkar, Kunal Korean Society of Sericultural Science 2008 International Journal of Industrial Entomology Vol.16 No.1
The present study was carried out with the aim to evaluate the viability of layings (delivery of fertilized and unfertilized eggs) with egg laying duration of elite bivoltine races. The temporal aspect of mating in terms of egg layings duration may also have impact on the number of eggs laid, pattern of egg laying and their viability. After different interval of egg laying duration, moth of Bombyx mori are removed from oviposition site after they have completed egg laying. Present investigation confirmed that there are no significant difference in relation to the occurrence of viable (fertilized) and non viable (unfertilized) eggs and duration of oviposition. Percentage of unfertilized eggs varied from 2.41 to 3.42% in case of CSR-3, 2.59 to 3.62% in case of CSR-6, 2.82 to 3.66% in case of CSR-16 and 2.58 to 3.40% in case of CSR-17 in different treatments. The occurrence of unfertilized eggs are also not significant in the different treatments specially in those eggs which were laid 24 hours after oviposition and kept for 4 months hibernation schedule.
Impact of Mating Duration on the Fecundity of the Newly Evolved Races
Mathur Vinod B.,Sarkar Kunal Korean Society of Sericultural Science 2006 International Journal of Industrial Entomology Vol.12 No.2
Of all factors that govern productivity in sericulture, the role of silkworm egg is of prime importance. The production of silkworm seed involves a long chain of interdependent and highly specialized conditions. Female moths of Bombyx mori L. commence egg deposition immediately when the moths were decoupled. More than 60% of eggs are deposited within 4 hrs after decoupling i.e. 62.33% in CSR-3, 61.67% in CSR-6, 62.50% in CSR-16 and 63.28% in CSR-17. Almost 90% of eggs were laid in the first 12 hrs (93.13% in CSR-3, 90.81% in CSR-6, 89.71% in CSR-16 and 93.17% eggs in CSR-17) after decoupling. Almost 8 to 10% of more eggs were laid when oviposition period was prolonged upto 48 hrs instead of 24 hrs. The present investigation showed that a significant increase of 45 (8.34%), 50 (9.98%), 41 (8.26%) and 45 (8.30%) (P < 0.01) numbers of more eggs were found between 24 to 48 hrs (T6 to T9) in CSR-3, CSR-6, CSR-16 and CSR-17 races respectively. The findings of present investigation is very important for sericulture industry while producing layings to keep for different hibernation schedule especially for autumn/late autumn crop, female may be allowed for prolonged oviposition to get 8 -10% more eggs and farmer may fetch 8 -10 kg. more cocoon yield/l00 dfls with more income.
Hitensinh Vaghela,Vikas Lakhera,Kunal Bhatt,Biswanath Sarkar 한국초전도저온학회 2021 한국초전도저온공학회논문지 Vol.23 No.4
The Cable in Conduit Conductor (CICC) configurations are designed, tested and realized to make high field superconducting(SC) magnets. The evolution of CICC design makes it challenging to forecast thermo-hydraulic behavior. A common objective ofthermo-hydraulic studies is to obtain the most reliable predictive correlation for friction factor in CICC geometries and to reducethe dependency on the experiment. So far, only the void fraction and Reynolds number have been considered in the predictivecorrelations in an explicit way. In the present paper, the CICC twisting pattern dependency, called tortuosity ( ), on the pressuredrop prediction, has been assessed through a numerical simulation approach. The CICC twisting pattern with 6+1 petals (solidconductor in the present study) with different twisting pitches is mimicked in the numerical simulation for the range 100 ≤ Re≤10000 and 1 < < 1.08 and a correlation for friction factor, f, has been proposed as a function of Re and .