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Search Results: 1 - 10 of 2539 matches for " Palash Chandra Karmaker "
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Thermal Behavior and Magnetic Properties of Nd-Fe-B Based Exchange Spring Nanocomposites Nd4-xTbxFe83.5Co5Cu0.5Nb1B6 (x = 0, 0.2, 0.4, 0.6, 0.8 and 1) Melt-Spun Ribbons  [PDF]
Palash Chandra Karmaker, Mohammad Obaidur Rahman, Nguyen Huy Dan, Samia Islam Liba, Per Nordblad, Dilip Kumar Saha, Sheikh Manjura Hoque
Advances in Materials Physics and Chemistry (AMPC) , 2017, DOI: 10.4236/ampc.2017.76018
Abstract: Co-rich Nd-Fe-B nanocomposite ribbons with Tb substituted have been fabricated by single roller melt spinning technique of Nd4-xTbxFe83.5Co5Cu0.5Nb1B6 (x = 0, 0.2, 0.4, 0.6, 0.8 and 1) alloys in an argon (Ar) atmosphere at a circumferential speed of 40 m/s. According to the differential scanning calorimeter (DSC) traces the nanocomposite samples have been annealed at different temperatures like 675°C, 687°C, 700°C, 712°C and 725°C for 10 min. Crystallization behavior was studied by X-ray diffraction in which it was found that the XRD patterns are characterized by broad diffused pattern which demonstrate the amorphous state of materials. The ribbon samples were also characterized by vibration sample magnetometer (VSM) and Mössbauer spectroscopy at as-cast and annealed condition. Co-rich and Tb substitution has significantly enhanced the value of coercivity (Hc) and maximum energy product (BH)max. Highest value of Hc and (BH)max has been obtained as 2.36 kOe and 6.11 MGOe for the sample annealed at 700°C for 10 min with higher concentration of Tb. The M-H hysteresis loops show extremely soft natures which do not possess any area. We have found reduced remanent ratio (Mr/Ms) up to 0.49 at optimal annealing temperature 700°C. However, with the annealing of the samples in the above mentioned temperature, evolution of large coercivity was observed due to the formation of exchange couple hard and soft nanocrystal composites. We have investigated the variation of Curie temperature (Tc) with annealing temperature of the melt spun ribbon samples. Mossbauer spectroscopy was carried out to study the hyperfine parameters such as hyperfine field, hyperfine field distribution for full width half maximum (FWHM) and isomer shift of Fe species of these two phases.
Determinants of child malnutrition in Bangladesh - A Multivariate Approach
Ahbab Mohammad Fazle Rabbi, Shamal Chandra Karmaker
Asian Journal of Medical Sciences , 2015, DOI: 10.3126/ajms.v6i2.10404
Abstract: Objective: Malnutrition is referred as the greatest single threat to the world’s public health, especially for the developing countries. Nutritional status is determined anthropometrically and it is outcome of complex interactions between biological, socio-economical variables. This study is conducted to identify the significant determinants of child malnutrition in Bangladesh. Method: Using BDHS-2007 data, Total 5312 cases are included in the present study. Multivariate techniques have been applied in this study to obtain significant determinants of child malnutrition. Results: Factor analysis revealed six factors as covariate of malnutrition; where two factors are socio-economical, others are biological and bio-social. Hence linear discriminant analysis is used to clarify the efficiency of obtained factors in malnutrition scenario; which imply that the obtained factors are accurate for approximately 60 percent observations. Conclusion: The obtained results suggest that, consciousness should be raised to improve socio-economic and maternal health conditions to improve the scenario of child malnutrition. DOI: http://dx.doi.org/10.3126/ajms.v6i2.10404 ? Asian Journal of Medical Sciences Vol.6(2) 2015 85-89
Kinetics, Isotherm and Thermodynamic Studies of the Adsorption of Reactive Red 239 Dye from Aqueous Solution by Chitosan 8B  [PDF]
Subarna Karmaker, Farin Sintaha, Tapan Kumar Saha
Advances in Biological Chemistry (ABC) , 2019, DOI: 10.4236/abc.2019.91001
Abstract: The adsorption of reactive red 239 (RR239) dye onto chitosan 8B was studied in aqueous solution at various pHs, initial dye concentrations, ionic strengths and temperatures, respectively. The adsorption of dye onto chitosan 8B was confirmed by diffuse reflectance electronic absorption spectra. The adsorption of RR239 onto chitosan 8B was greatly influenced by solution pHs, initial dye concentrations, ionic strengths and temperatures. The kinetics and mechanism of dye adsorption process were analyzed by pseudo first-, second-order, Elovich and intraparticle diffusion kinetic models. The adsorption kinetics of RR239 dye followed a pseudo second-order model very well. The surface sorption and intraparticle diffusion mechanisms were involved in the actual sorption process. The equilibrium isotherm data were fitted well with the Langmuir model rather than the Freundlich, Temkin and Dubinin-Radushkevich models. The maximum dye adsorption onto chitosan 8B was estimated to be 163.93 μmol/g at 45°C. The activation energy (Ea) was obtained to be 23.30 kJ/mol. The computed thermodynamic parameters such as ΔG\"\", ΔH\"\", ΔS\"\", ΔG, ΔH and ΔS confirmed that the adsorption of RR239 dye onto chitosan 8B was a spontaneous endothermic physisorption process. Desorption test was carried out in NaOH solution (pH 12.5) and the chitosan flakes could be reused.
Bioelectricity from Anaerobic Co-Digestion of Organic Solid Wastes and Sewage Sludge Using Microbial Fuel Cells (MFCs)  [PDF]
Rasel Sheikh, Sourav Karmaker, Mohammad Solayman, Jebunnahar Mayna
Journal of Sustainable Bioenergy Systems (JSBS) , 2018, DOI: 10.4236/jsbs.2018.83007
Abstract: Recently microbial fuel cells (MFCs) have been considered as an alternative power generation technique by utilizing organic wastes. In this study, an experiment was carried out to generate bioelectricity from co-digestion of organic waste (kitchen waste) and sewage sludge as a waste management option using microbial fuel cell (MFC) in anaerobic process. A total of five samples with different sludge-waste ratio were used with zinc (Zn) and cupper (Cu) as cell electrodes for the test. The trends of voltage generation were different for each sample in cells such as 350 mV, 263 mV, 416 mV maximum voltage were measured from sample I, II and III respectively. It was observed that the MFC with sewage sludge showed the higher values (around 960 mV) of voltages with time whereas 918 mV obtained with organic waste. Precisely comparing cases with varying the organic waste and sewage sludge ratio helps to find the best bioelectricity generation option. Using MFCs can be appeared as the solution of electricity scarcity along the world as an efficient and eco-friendly manner as well as organic solid waste and sewage sludge management.
A Literature Review on Portable / Mobile Homes – Issues & Challenges
Palash Patodi
International Journal of Research in Aeronautical and Mechanical Engineering , 2013,
Abstract: India is known as land of villages with 6, 40,687 in number. According to Census 2011, the population of India was 121 crore with 83.3crore persons living in rural and 37.7 crore living in urban areas. More than 70% of our population lives in rural areas. Even after independence, these rural areas are still under the process of development. After the waves of globalisation, the Indian economy is blooming. The rural markets are insulated from the global meltdown. This has also affected the growth of Indian rural economy. The major attributes to this growth are modernisation of farming, expansion of education, transportation and access to better primary health facilities. The literacy rate in rural area has increased by 10.2% in last 10 years. An amount of Rs.12, 500 crores are submitted by rural India to the national income. It is observed that rural India likes to contribute in the overall growth of economy & is very proactive to adapt the new ways of modernisation and innovation. According to industrialist, “Future drivers of growth are rural India.” At the backdrop of this scenario, the present project of Portable Home / Mobile Home is aimed to put forth aninclusive model for the growth of agriculture and to provide product that can enhance the comfort and status level to reduce stress and anxiety of farmers who are involved in the hard work of farming.
Design of Reversible Counter
Md. Selim Al Mamun,B. K. Karmaker
Computer Science , 2014, DOI: 10.14569/IJACSA.2014.050117
Abstract: This article presents a research work on the design and synthesis of sequential circuits and flip-flops that are available in digital arena; and describes a new synthesis design of reversible counter that is optimized in terms of quantum cost, delay and garbage outputs compared to the existing designs. We proposed a new model of reversible T flip-flop in designing reversible counter
Hardware Architecture and Cost/time/data Trade-off for Generic Inversion of One-Way Function
Mukhopadhyay, Sourav;Sarkar, Palash;
Computación y Sistemas , 2009,
Abstract: in many cases, a cryptographic algorithm can be viewed as a one-way function, which is easy to compute in forward direction but hard to invert. inverting such one-way function amounts to breaking the algorithm. time-memory trade-off (tmto) is a twenty five years old generic technique for inverting one-way functions. the most feasible implementation of tmto is in special purpose hardware. in this paper, we describe a systematic architecture for implementing tmto. we break down the offline and online phases into simpler tasks and identify opportunities for pipelining and parallelism. this results in a detailed top-level architecture. many of our design choices are based on intuition. we develop a cost model for our architecture. analysis of the cost model shows that 128-bit keys seem safe for the present. however, key sizes less than 96 bits do not provide comfortable security assurances.
Representation-independent manipulations with Dirac matrices and spinors
Pal, Palash B.
High Energy Physics - Phenomenology , 2007,
Abstract: Dirac matrices, also known as gamma matrices, are defined only up to a similarity transformation. Usually, some explicit representation of these matrices is assumed in order to deal with them. In this article, we show how it is possible to proceed without any such assumption. Various important identities involving Dirac matrices and spinors have been derived without assuming any representation at any stage.
Gate Leakage Current Reduction With Advancement of Graded Barrier AlGaN/GaN HEMT
Palash Das,Dhrubes Biswas
Journal of Nano- and Electronic Physics , 2011,
Abstract: The gate leakage current reduction solution of AlGaN/GaN HEMT device issue has been addressed in this paper with compositional grading of AlGaN barrier layer. This work is also conjugated with the critical thickness limitation of heterostructure material growth. Hence, critical thickness calculation of AlGaN over GaN has been kept in special view. 1D Schrodinger and Poisson solver was used to calculate the 2DEG concentration and effective location to use it in the ATLAS device simulator for the predictions. The proposed Al0.50Ga0.50N/Al0.35Ga0.65N/Al0.20Ga0.80N/GaN HEMT structure exhibits the leakage current of the order of around 15 nA/mm at gate voltage of 1 V.
Rare K-Decays as Crucial Tests for Unified Models with Gauged Baryon Number:
Palash B. Pal
Physics , 1993, DOI: 10.1016/0370-2693(93)90548-V
Abstract: In the grand-unified models based on SU(15) and SU(16) in which the quarks and leptons are un-unified at the intermediate stages, we show that ${\rm BR}\; (K_L \to \mu e) \leq 10^{-14}$ and ${\rm BR}\; (K^+ \to \pi^+\mu e) \leq 10^{-14}$ despite the presence of leptoquark gauge bosons. Thus, the observation of these processes in the ongoing or upcoming experiments will rule out the models.
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