http://chineseinput.net/에서 pinyin(병음)방식으로 중국어를 변환할 수 있습니다.
변환된 중국어를 복사하여 사용하시면 됩니다.
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.
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.
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.
Aniket Chakrabarty,Pritam Chakraborty,Roopam Jain,Vivek Kr. Sahu,N. P. Gurao,H. N. Bar,Niloy Khutia 대한금속·재료학회 2023 METALS AND MATERIALS International Vol.29 No.10
A novel computational framework has been presented in this work for understanding the mechanical deformation behaviorin additively manufactured parts. AlSi10Mg parts were additively manufactured and investigated for effects on microstructuredue to changes in process parameters. The morphological characteristics of the printed parts were assessed, and 2Dstatistically equivalent representative volume elements (SERVEs) were created and analyzed for deformation under tensioncomputationally with crystal plasticity finite element method (CPFEM) with a combined MATLAB and ABAQUS interactiveframework. For assessing the CPFEM parameters, an interactive ABAQUS and MATLAB environment was implementedusing MATLAB’s genetic algorithm (GA) toolbox. Various results like von Mises stress distribution, maximum in-planestress distribution, and L2-norm of Green Lagrange’s strain were compared, and it was found that the vulnerability of thestructures is related to the change in process or build parameters. CPFEM analyses on 3D microstructures generated throughDREAM. 3D further confirmed the validity of results for CPFEM in 2D. The developed 2D framework also predicted thetexture that correlated well with the tension test findings. Parallely, a finite element framework was developed to study thelocalization effects on AM specimens due to the presence of pores. This work has reported two separate viewpoints in termsof porosity and microstructure.
Aniket Chakrabarty,Vivek Kumar Sahu,Anindya Das,Shreya Mukherjee,Nilesh Prakash Gurao,Pritam Chakraborty,Himadri Nandan Bar,Niloy Khutia 대한금속·재료학회 2022 METALS AND MATERIALS International Vol.28 No.1
The scanning strategy has a measurable impact on the grain size and growth direction of the produced parts in powder bedfusion. Tilting of the laser scan lines by 67° is a default procedure applicable to PBF machines for obtaining maximumvariability in the direction of melt pools. In this work, AlSi10Mg parts were produced through direct metal laser sinteringwith two diferent scanning strategies. In the frst strategy, the scanning lines were not tilted in between layers while in thesecond strategy, the scanning lines were tilted by 67°. The microstructures of the as-deposited alloys for the two strategieswere evaluated by state-of-art characterization methods like scanning electron microscopy, electron backscatter difraction(EBSD), X-ray computed tomography (X-ray CT), and X-ray difraction. Monotonic tensile tests were hence conducted inboth categories. Greater tensile strength was demonstrated by the specimens with no tilting of the scan lines while the specimens produced with a 67° tilt manifested greater elongation. Grain morphology characterized by EBSD studies suggestedan inhomogeneity in grain size for the specimens with no tilting of the scan lines. This had primarily attributed to the earlyfailure of the same. It was also found out that the preferred growth direction of grains in AlSi10Mg was hindered by tiltingthe scan lines by 67°. X-Ray CT studies and Kocks–Mecking Analysis explained the deformation and hardening behaviorof both the types in the view of porosity and structural defects.