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Guchhait, Sujit Kumar,Paul, Subir The Korean Electrochemical Society 2016 Journal of electrochemical science and technology Vol.7 No.3
Application of fuel cell to produce renewable energy for commercial purpose is limited by the high cost of Pt based electrode materials. Development of inexpensive, high energetic electrode is the need of the hour to produce pollution free energy using bio-fuel through a fuel cell. Ni-Cu and Ni-CeO<sub>2</sub>-Cu electrode materials, electro synthesized by pulse current have been developed. The surface morphology of the electrode materials is controlled by different deposition parameters in order to produce a high current from the electro-oxidation of the fuel, the ethanol. The developed materials are electrochemically characterized by Cyclic Voltammetry (CV), Chronoamperometry (CA) and Potentiodynamic polarization tests. The results confirm that the high current is due to their enhanced catalytic properties viz. high exchange current density (i<sub>0</sub>), low polarization resistance (R<sub>p</sub>) and low impedance. It is worthwhile to mention here that the addition of CeO<sub>2</sub> to Ni-Cu has outperformed Pt as far as the high electro catalytic properties are concerned; the exchange current density is about eight times higher than the same on Pt surface. The morphology of the electrode surface examined by SEM and FESEM exhibits that the grains are narrow and sub spherical with 3D surface, containing vacancies in between the elongated grains. The fact has enhanced more surface area for electro oxidation of the fuel, giving rise to an increase in current. Presence of Ni, CeO<sub>2</sub>, and Cu is confirmed by the XRD and EDXS. Fuel cell fabricated with Ni-CeO<sub>2</sub>-Cu material electrode is expected to produce clean electrical energy at cheaper rates than conventional one, using bio fuel the derived from biomass.
Manufacturing quality improvement and setup cost reduction in a vendor-buyer supply chain model
Majumder, Arunava,Guchhait, Rekha,Sarkar, Biswajit Inderscience Enterprises Ltd. 2017 European journal of industrial engineering Vol.11 No.5
<P>Quality improvement and setup cost reduction of any production system are endless procedure. Customer's demand is always intended to have the best quality product and the industries always try to improve the quality of products. This paper develops a two-echelon supply chain model with quality improvement of products and setup cost reduction under controllable lead time. The lead time demand follows a normal distribution and in the second case, it does not consider any specific distribution except a mean and standard deviation. Both models are solved analytically to obtain global solution. Two improved iterative algorithms are developed in order to obtain the optimal results of decision variables numerically to minimise the total system cost. The expected value of additional information is calculated to show the financial effect for collecting the information about lead time demand distribution. Some numerical examples and sensitivity analysis are given to illustrate the model.</P>
Molecular Insights into Toluene Sensing in the TodS/TodT Signal Transduction System
Koh, Serry,Hwang, Jungwon,Guchhait, Koushik,Lee, Eun-Gyeong,Kim, Sang-Yoon,Kim, Sujin,Lee, Sangmin,Chung, Jeong Min,Jung, Hyun Suk,Lee, Sang Jun,Ryu, Choong-Min,Lee, Seung-Goo,Oh, Tae-Kwang,Kwon, Ohsu American Society for Biochemistry and Molecular Bi 2016 The Journal of biological chemistry Vol.291 No.16
<P>TodS is a sensor kinase that responds to various monoaromatic compounds, which either cause an agonistic or antagonistic effect on phosphorylation of its cognate response regulator TodT, and controls <I>tod</I> operon expression in <I>Pseudomonas putida</I> strains. We describe a molecular sensing mechanism of TodS that is activated in response to toluene. The crystal structures of the TodS Per-Arnt-Sim (PAS) 1 sensor domain (residues 43–164) and its complex with toluene (agonist) or 1,2,4-trimethylbenzene (antagonist) show a typical β2α3β3 PAS fold structure (residues 45–149), forming a hydrophobic ligand-binding site. A signal transfer region (residues 150–163) located immediately after the canonical PAS fold may be intrinsically flexible and disordered in both apo-PAS1 and antagonist-bound forms and dramatically adapt an α-helix upon toluene binding. This structural change in the signal transfer region is proposed to result in signal transmission to activate the TodS/TodT two-component signal transduction system. Site-directed mutagenesis and β-galactosidase assays using a <I>P. putida</I> reporter strain system verified the essential residues involved in ligand sensing and signal transfer and suggest that the Phe<SUP>46</SUP> residue acts as a ligand-specific switch.</P>
Corporate social responsibility and revenue sharing policy for a dual-channel buyback contract
Biswajit Sarkar,Rekha Guchhait 대한산업공학회 2021 대한산업공학회 춘계학술대회논문집 Vol.2021 No.6
Industries nowadays are participating in social development to improve the standard of living. There are several criteria to balance economic growth and social development. Besides, the pattern of business is changing every day based on the circumstance. The use of online channels among people is increasing gradually. A manufacturer opens both possibilities of the traditional channel as well as the online channel. In the traditional channel, the manufacturer is in a buyback contract with the retailer. The manufacturer is in direct contact with customers through the online channel. The manufacturer uses returned products from the retailer for social welfare through corporate social responsibility. For the coordination business, the manufacturer shares revenue with the retailer. Stackelberg’s game strategy is used to find the leader and follower of the supply chain in the non-coordination case. The classical optimization technique finds optimal solutions. An example is given to validate the mathematical model numerically.
Shyamal Dutta,Mehebub Sahana,Sanat Kumar Guchhait 대한공간정보학회 2017 Spatial Information Research Vol.25 No.3
With the increasing degradation and encroachment of natural landscape environmentalists are now highly concerned with declining forest cover as well as increasing forest fragmentation at different scales across the world for last several decades. Considering the major fourfold effect of forest fragmentation i.e., reduction in habitat area, increased number of fragmented habitats, decrease in area coverage of habitat patch and increased number of isolated patches forest fragmentation is recognized as a major threat to forest ecosystems. Indicators of forest fragmentation are thereby gaining gradual importance at national and international environmental programs. But Spatio-temporal change of forest cover using forest fragmentation along with incorporation of population growth and associated anthropogenic intervention, at a micro-spatial scale has become the major thrust area in the present study. Kanksa is one of the few forest dominated block in Barddhaman District mostly affected by the rapid population growth, land use change in terms of increase in irrigated area as well as agricultural land, rapid urbanization in the last three decades. Present study focuses on forest fragmentation and spatio-temporal dynamics of forest cover from the beginning of 1990s up to present using geospatial techniques.
Singh, Rupashree Balia,Mahanta, Subrata,Bagchi, Arnab,Guchhait, Nikhil Korean Society of Photoscience 2009 Photochemical & photobiological sciences Vol.8 No.1
The charge transfer (CT) probe ethyl ester of N,N-dimethylamino naphthyl acrylic acid (EDMANA) bound to Human Serum Albumin (HSA) serves as an efficient reporter of the polarity and conformational changes of protein in aqueous buffer (Tris-HCl buffer, pH = 7.03) and in presence of denaturant, quencher and reverse micelles. The change in fluorescence intensity and the position of emission maxima of EDMANA in presence of HSA well reflect the nature of binding and location of the probe inside the proteinous environment. The increase in steady state anisotropy values with increase of protein concentration indicate restriction imposed on the mobility of the probe molecules in the proteinous medium. The results of fluorescence quenching of EDMANA by acrylamide, Fluorescence Resonance Energy Transfer (FRET) and Red Edge Excitation Shift (REES) studies throw light on the accessibility to the probe bound to HSA and hence indicate the probable location of the probe within the hydrophobic cavity of HSA. The complicated nature of protein unfolding in presence of urea is well studied by change in the fluorescence properties of EDMANA bound to HSA protein.