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RISS 인기검색어
- 검색키워드
- 저자 : G.Majumdar (검색결과 5 건)
- 무료
- 기관 내 무료
- 유료
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Tuning the Frictional Properties of Carbon Fabrics Using Boron Carbide Particles
Selim Gürgen,Abhijit Majumdar 한국섬유공학회 2019 Fibers and polymers Vol.20 No.4
In recent years, researches have made many efforts to improve the frictional properties of high performance fabricsby using different methods such as applying natural rubber latex, developing metal oxide nano-rods and treating with shearthickening fluids. Even though these methods have provided beneficial results for enhanced frictional behavior, they exhibitsome drawbacks in terms of flexibility, stability and ease of application. For this reason, an attempt has been made in thisresearch to tune the frictional properties of carbon fabric through a simple process such as coating the fabric with boroncarbide particles in polyethylene glycol medium. The surface friction as well as yarn-to-yarn friction were evaluated and itwas found that the presence of only polyethylene glycol (PEG) or the mixture of PEG/boron carbide enhances the surfacefriction and yarn-to-yarn friction in the fabric. In addition, the role of boron carbide concentration used in the treatmentprocess was investigated. It was found that the friction in carbon fabric can be controlled by altering the amount of boroncarbide particles used in the treatment process.
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A Versatile IC Design & Current-Sense IGBT Match For Smart Modules
G.Majumdar,T.Nakajima,H.Iwamoto 전력전자학회 1989 ICPE(ISPE)논문집 Vol.- No.-
An integrated circuit and a new series of currrent sensing IGBT chips have been developed to meet the growing trend toward Power ICs. The new IC will directly drive and protect an n-channel current-sense type power MOSFET or IGBT under the direction of input. The IC is designed particularly for inverter circuit application where the power bridge is constituted by the above mentioned MOSPOWER devices of 10 to 50A and up to 600V class. This paper describes the details of the internal circuit design, the switching and protection performances of the new IC and the new IGBTs. The paper will also describe application and functionality of these devices in configuring typical inverter bridges on board or within modular housings where the IC is paired togetherwith the newly developed current-sense n-channel IGBT of 10 20A, 500V class.
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Sharma, G.T.,Majumdar, A.C.,Gupta, L.K. Asian Australasian Association of Animal Productio 1999 Animal Bioscience Vol.12 No.7
Circulating lymphocytes collected from control and heat-stressed buffaloes were subjected to in vitro culture with glucocorticoids, epinephrine or serotonin and their effect, if any, on the release of intracellular prolactin (PRL) was studied using ELISA and C-ELISA techniques. It was noted from the study that PRL level was higher in lymphocytes than in plasma of the control and heat-stressed animals, and that the PRL levels increased in the plasma of heat-stressed animals compared to that of non stressed animals with a significant decrease in lymphocytic PRL content by heat stress. Epinephrine and serotonin significantly increased the release of intracellular PRL from the lymphocytes of both in the control and the heat-stressed buffaloes but release of PRL from lymphocyte was not significantly changed by cortisol treatment in both control and heat-stressed buffaloes as compared to epinephrine and serotonin in vitro. When lympocytes were incubated with serotonin, it caused drastic lysis of the lymphocytes but epinephirine and cortisol did not show any lysis. It may be concluded from this study that hormones like epinephrine or serotonin known to increase during stress, release intracellular PRL from lymphocytes, the satellite PRL storage/synthesizing organ of blood, although the mechanism of the release is different.
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Sharma, G. Taru,Teotia, Alok,Majumdar, A.C. Asian Australasian Association of Animal Productio 2001 Animal Bioscience Vol.14 No.6
Evaluation of the granulosa cell (GC) monolayers developed from small (<5 mm) and large (>5 mm) follicles on the meiotic competence of caprine oocytes during in vitro maturation was done in this study in comparison to the granulosa cell coculture. Ovaries were collected from the local abattoir and follicular contents were aspirated for the monolayer culture. For IVM the oocytes were collected by puncturing the nonatretic follicles (>4 mm). Results revealed that at the same seeding rate, small follicular granulosa cell monolayer achieved confluence 24-48 h earlier than large follicular granulosa cell monolayer. GC monolayers significantly p (<0.05) improved the rate of meiotic resumption and nuclear maturation (84.76% vs 74.74%) after 27 h of culture in comparison to GC coculture. Statistically there was no significant difference in the maturation rate between the caprine oocytes matured over small or large follicular GC monolayers. It is concluded from the present study that GC monolayers support better nuclear and cytoplasmic maturation of growing caprine oocytes which is evident by better maturation rate over GC monolayer as compared to the oocytes matured with GC coculture. Granulosa cells from small and large follicles can be used for IVM with more or less in the same efficiency after conditioning them with maturation media in 18-24 h before the onset of culture.
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