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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.
Chakrabarty, D.,Datta, S.K. The Korean Society of Plant Biotechnology 2010 Plant biotechnology reports Vol.4 No.3
Six parent and their 12 gamma ray-induced somatic flower colour mutants of garden rose were characterized to discriminate the mutants from their respective parents and understanding the genetic diversity using Random amplification of polymorphic DNA (RAPD) markers. Out of 20 primers screened, 14 primers yielded completely identical fragments patterns. The other 7 primers gave highly polymorphic banding patterns among the radiomutants. All the cultivars were identified by using only 7 primers. Moreover, individual mutants were also distinguished by unique RAPD marker bands. Based on the presence or absence of the 48 polymorphic bands, the genetic variations within and among the 18 cultivars were measured. Genetic distance between all 18 cultivars varied from 0.40 to 0.91, as revealed by Jaccard's coefficient matrix. A dendrogram was constructed based on the similarity matrix using the Neighbor Joining Tree method showed three main clusters. The present RAPD analysis can be used not only for estimating genetic diversity present in gamma ray-induced mutants but also for correct identification of mutant/new varieties for their legal protection under plant variety rights.
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.
Assessment of the Potential of Watermelon Rind Powder for the Value Addition of Noodles
Chakrabarty Nayan,Mourin Mehrin Mamun,Islam Nawsheen,Haque Ahmed Redwan,Akter Sorifa,Siddique Abu Ayub,Sarker Manobendro 한국농업기계학회 2020 바이오시스템공학 Vol.45 No.4
Purpose This study was conducted to investigate the potential of watermelon rind as a source of nutrients for the value addition of noodles. Methods Three different varieties of watermelon with yellow, dark green, and pale green rind were separately dried to produce rind powder and studied for their proximate composition, phenol content, and antioxidant activity. The effect of the substitution of wheat flour with different levels ofwatermelon rind powder (WRP) (10–20%) on the cooking and sensory attributes of noodles was investigated. Results The results showed that the rind powder of the pale green rind watermelon (PGRW) contained the maximum amount of protein (19.74%), whereas the highest amount of fiber (13.35%) was present in that of the dark green rind watermelon (DGRW). In contrast, the rind powder of the yellow rind watermelon (YRW) had a higher amount of fat (13.00%) thanDGRW(8.37%) and PGRW(5.83%). However, the total phenol content in terms of gallic acid equivalent (GAE) was the maximumin PGRW(166.88 GAE/g), which resulted in greater antioxidant activity (13.28%). Furthermore, the incorporation of WRP affected the cooking yield of the noodles. Both the cooking yield and cooking loss were at maximum with the incorporation of 15% rind powder. Sensory evaluation indicated that the control sample was the most acceptable, followed by the noodles with 10% WRP, among the value-added noodles. Conclusion Considering the nutritional potential, 10% WRP can be incorporated with wheat flour for the large-scale production of noodles.
Metal Surface Treatment Effects on Screen Printed Silicon Solar Cells
Chakrabarty K.,Mangalaraj D.,Kim K. H.,Dhungel S. K.,Park J. H.,Singh S. N. The Korean Institute of Electrical and Electronic 2003 Transactions on Electrical and Electronic Material Vol.4 No.4
High series resistance due to the presence of glass frit is one of the major problems for screen printed silicon solar cells. Cells having electrical parameters below the prescribed values are usually rejected during solar module fabrication. Therefore, it is highly desirable to improve the electrical parameters of the silicon solar cells and thereby to increase the overall production yield. It was observed that, the performance of low quality mono-crystalline silicon solar cells made by standard screen printing technology could be improved remarkably by novel surface treatment. We have chemically treated the surface using sodium hydroxide (NaOH) and silver nitrate ($AgNO_3$) solutions. NaOH treatment helps to reduce the series resistance by decreasing the presence of excess glass frit on the top silver grid contact. The $AgNO_3$ treatment is used to reduce the series resistance comes from the deposition of silver on the grids by filling the holes present (if any) within the grid pattern.
Metal Surface Treatment Effects on Screen Printed Silicon Solar Cells
K.Chakrabarty,D.Mangalaraj,김경해,S.K.Dhungel,J.H.Park,이준신,S.N.Singh 한국전기전자재료학회 2003 Transactions on Electrical and Electronic Material Vol.4 No.4
High series resistance due to the presence of glass frit is one of the major problems for screen printed silicon solar cells. Cells having electrical parameters below the prescribed values are usually rejected during solar module fabrication. Therefore, it is highly desirable to improve the electrical parameters of the silicon solar cells and thereby to increase the overall production yield. It was observed that, the performance of low quality mono-crystalline silicon solar cells made by standard screen printing technology could be improved remarkably by novel surface treatment. We have chemically treated the surface using sodium hydroxide (NaOH) and silver nitrate (AgNO3) solutions. NaOH treatment helps to reduce the series resistance by decreasing the presence of excess glass frit on the top silver grid contact. The AgNO3 treatment is used to reduce the series resistance comes from the deposition of silver on the grids by filling the holes present (if any) within the grid pattern.