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Bhunia A. K.,Kamilya T.,Saha S. 나노기술연구협의회 2017 Nano Convergence Vol.4 No.28
In this paper, we have used spectroscopic and electron microscopic analysis to monitor the time evolution of the silver nanoparticles (Ag NP)–human hemoglobin (Hb) corona formation and to characterize the interaction of the Ag NPs with Hb. The time constants for surface plasmon resonance binding and reorganization are found to be 9.51 and 118.48 min, respectively. The drop of surface charge and the increase of the hydrodynamic diameter indicated the corona of Hb on the Ag NP surface. The auto correlation function is found to broaden with the increasing time of the corona formation. Surface zeta potential revealed that positively charged Hb interact electrostatically with negatively charged Ag NP surfaces. The change in α helix and β sheet depends on the corona formation time. The visualization of the Hb corona from HRTEM showed large number of Hb domains aggregate containing essentially Ag NPs and without Ag NPs. Emission study showed the tertiary deformation, energy transfer, nature of interaction and quenching under three different temperatures.
Kinetic Studies of Alkaline Protease from Bacillus Licheniformis NCIM-2042
( Bhunia Biswanath ),( Bikram Basak ),( Pinaki Bhattacharya ),( Apurba Dey ) 한국미생물 · 생명공학회 2012 Journal of microbiology and biotechnology Vol.22 No.12
An extensive investigation was carried out to describe the kinetics of cell growth, substrate consumption, and product formation in the batch fermentation using starch as substrate. Evaluation of intrinsic kinetic parameters was carried out using a best-fit unstructured model. A nonlinear regression technique was applied for computational purpose. The Andrew`s model showed a comparatively better R2 value among all tested models. The values of specific growth rate (?max), saturation constant (KS), inhibition constant (KI), and YX/S were found to be 0.109 h-1, 11.1 g/l, 0.012 g/l, and 1.003, respectively. The Leudeking- Piret model was used to study the product formation kinetics and the process was found to be growth-associated. The growth-associated constant (α) for protease production was sensitive to substrate concentration. Its value was fairly constant up to a substrate concentration of 30.8 g/l, and then decreased.
Bhunia, Prasenjit,Hwang, Eunhee,Min, Misook,Lee, Junghyun,Seo, Sohyeon,Some, Surajit,Lee, Hyoyoung The Royal Society of Chemistry 2012 Chemical communications Vol.48 No.6
<p>We introduce non-volatile resistive crossbar memory based on ionic liquid covalently functionalized on a partially reduced graphene oxide (PrGO). The write–read–erase–read (WRER) cycles were very stable after several hundred cycles and the retention time of both the ON and OFF states was stable for over 1000 s, indicating that the device we developed can function as a non-volatile memory device.</p> <P>Graphic Abstract</P><P>We introduce non-volatile resistive crossbar memory based on ionic liquid covalently functionalized on a partially reduced graphene oxide. The WRER cycles were stable after several hundred cycles and the retention time of both the ON and OFF states was stable for over 1000 s, which is suitable for non-volatile memory device. <img src='http://pubs.rsc.org/ej/CC/2011/c1cc16225j/c1cc16225j-ga.gif'> </P>
A study on the behaviour of coupled shear walls
Bhunia, Dipendu,Prakash, Vipul,Pandey, Ashok D. Techno-Press 2012 Structural Engineering and Mechanics, An Int'l Jou Vol.42 No.5
An effective design technique for symmetrical coupled shear walls is presented. Proposed formulation including assumptions and steps with mathematical formulation has been elaborated to make the design technique. An example has been considered to validate the technique with the DRAIN-3DX (1993) and SAP V 10.0.5 (2000) nonlinear programs. Parametric study has also been considered to find out the limitations along with remedial action of this technique. On the other hand, nonlinear static analysis is considered to determine the response reduction factor of coupled shear walls. Finally, it has been concluded in this paper that the proposed design technique can be considered to design the coupled shear walls under seismic motion.
Spatio-temporal analysis of COVID-19 in India – a geostatistical approach
Bhunia Gouri Sankar,Roy Santanu,Shit Pravat Kumar 대한공간정보학회 2021 Spatial Information Research Vol.29 No.5
Coronavirus (Covid) is a severe acute respiratory syndrome infectious disease, spreads primarily between human beings during close contact, most often through the coughing, sneezing, and speaking small droplets. A retrospective surveillance research is conducted in India during 30th January–21st March 2020 to gain insight into Covid’s epidemiology and spatial distribution. Voronoi statistics is used to draw attention of the affected states from a series of polygons. Spatial patterns of disease clustering are analyzed using global spatial autocorrelation techniques. Local spatial autocorrelation has also been observed using statistical methods from Getis-Ord Gi *. The findings showed that disease clusters existed in the area of research. Most of the clusters are concentrated in the central and western states of India, while the north-eastern countries are still predominantly low-rate of clusters. This simulation technique helps public health professionals to identify risk areas for disease and take decisions in real time to control this viral disease.
Estimations of Zeros of a Polynomial Using Numerical Radius Inequalities
Bhunia, Pintu,Bag, Santanu,Nayak, Raj Kumar,Paul, Kallol Department of Mathematics 2021 Kyungpook mathematical journal Vol.61 No.4
We present new bounds for the numerical radius of bounded linear operators and 2 × 2 operator matrices. We apply upper bounds for the numerical radius to the Frobenius companion matrix of a complex monic polynomial to obtain new estimations for the zeros of that polynomial. We also show with numerical examples that our new estimations improve on the existing estimations.
A study on the behaviour of coupled shear walls
Dipendu Bhunia,Vipul Prakash,Ashok D. Pandey 국제구조공학회 2012 Structural Engineering and Mechanics, An Int'l Jou Vol.42 No.5
An effective design technique for symmetrical coupled shear walls is presented. Proposed formulation including assumptions and steps with mathematical formulation has been elaborated to make the design technique. An example has been considered to validate the technique with the DRAIN-3DX (1993) and SAP V 10.0.5 (2000) nonlinear programs. Parametric study has also been considered to find out the limitations along with remedial action of this technique. On the other hand, nonlinear static analysis is considered to determine the response reduction factor of coupled shear walls. Finally, it has been concluded in this paper that the proposed design technique can be considered to design the coupled shear walls under seismic motion.
Soil organic carbon stock explored by geo-spatial modeling at Sagar Island, India
Gouri Sankar Bhunia,Pravat Kumar Shit,Ramkrishna Maiti 대한공간정보학회 2016 Spatial Information Research Vol.24 No.5
Soil organic carbon (SOC) and organic carbon density (OCD) is an active indicator of soil fertility and productivity, and it fluctuates spatially and temporally. The main objective of the present study is to evaluate the spa- tial variability of SOC and OCD using geostatistics model as well as field methods at Sagar Island (Sundarban), India. Soil samples at the depths of 0–20 cm were collected from twenty plots at different season to estimate organic carbon concentrations and carbon density in the laboratory. Spatial distributions of SOC and OCD concentrations were esti- mated using ordinary kriging method. Remote sensing imagery and ground truth helped in identifying different features as well as land use/land cover correctly. Landuse are characterized by coastal water, sand, coastal wetland, salt marsh, agricultural fallow land, sparse vegetation, crop/paddy field, and mixed settlement area. The average value SOC were recorded as 2.80, 1.83, and 2.069 % in post-monsoon, pre-monsoon and monsoon season respec- tively. Semivariograms models of SOC and OCD in all seasons illustrated strong positive nugget values indicated short scale variability and sampling error. The coefficient of determination (R2 ) of the SOC model denoted as 0.71, 0.68 and 0.74 and for OCD calculated as 0.78, 0.67 and 0.83 at pre-monsoon, monsoon and post-monsoon season respectively. The results illustrated that mangrove forest portrayed highest amount of SOC concentration in both the pre-monsoon (1.05 kg/m2 ) and post-monsoon (0.94 kg/m2 ) season.