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Panigrahi A.,Central Institute of Technology Kokrajhar | Parhi A.,Bineswar Brahma Engineering College
Proceedings - 2016 IEEE International Symposium on Nanoelectronic and Information Systems, iNIS 2016 | Year: 2016

A gain enhacement technique for a pseudo-differential OTA based on Voltage Combiner, suitable for Sub-1V applications is presented in this work. The proposed technique uses a Gm boosted Voltage combiner. Unlike the typical voltage combiner which has an approximated gain of 2, this Voltage combiner can produce gain more than 5, so helping us to get more than 50dB of DC gain for the OTA at 0.5V supply. The designed OTA achieves DC gain of nearly 60dB with UGB of 250 kHz at a capacitive load of 10pF at a very low power of 716 nWatts. So as to facilitate maximum swing at 0.5V supply and lower the power consumption, MOS transistors are biased in weak/moderate inversion. The OTA is designed in standard 65nm CMOS Process. The 2 stage OTA uses MCNR approach to emulate first order Phase response before UGB, giving a Phase Margin ofmore than 50 degree for typical load of 10pF. The input referred noise is 150μV/√(Hz) at 10Hz and Slew Rate 0.02V/μSec for load of 10pF. © 2016 IEEE.

Baudron P.,Ecole Polytechnique de Montréal | Baudron P.,IRD Montpellier | Baudron P.,General Electric | Sprenger C.,Kompetenzzentrum Wasser Berlin | And 3 more authors.
Environmental Earth Sciences | Year: 2016

This study aimed at characterizing the groundwater flow pattern in a semi-arid agricultural area in northern India crossed by an intermittent monsoon-controlled watercourse, the Najafgarh drain. More specifically, it focused on studying the impact of groundwater recharge from the riverbed to the regional aquifer using hydrogeochemical and isotopic data. Significant hydrogeochemical zonation was observed between the northern, central and southern sides of the drain, linked to different mineralization processes and mixings. Northward from the drain, groundwater was mainly brackish (4.1–23.4 mS/cm), due to dissolution of evaporites (halite and anhydrite). Southward from the drain, mostly fresh groundwater was found (from 0.5 to 2.3 mS/cm), revealing notable cation exchange processes. In the vicinity of the drain (central area), mineralization was intermediate (0.7–4 mS/cm) and groundwater showed low geochemical evolution, supposing a distinct origin. Stable isotopes of water (δ18O, δ2H) confirmed that central groundwater was not a simple mixing between northern and southern groundwater masses, but had a significant component of infiltrated surface water from the drain. Potentiometric data supported these findings and confirmed the contribution of the drain to the recharge of the aquifer, setting up a hydraulic barrier between north and south, despite surface water availability limited to the monsoon season and low hydraulic conductivity of the riverbed. This study demonstrates the value of the geochemical and isotopic analysis of groundwater to characterize groundwater flow pattern in peri-urban agricultural areas, especially surface water–groundwater interactions. © 2016, Springer-Verlag Berlin Heidelberg.

Borah P.,Tezpur University | Borah P.,Bineswar Brahma Engineering College | Singh M.K.,University of Liège | Mahapatra S.,Tezpur University
Sustainable Cities and Society | Year: 2015

Efficient use of energy in buildings has become a necessity due to increasing heating and cooling energydemand. Degree-days are a versatile climatic indicator that can be used to estimate the heating andcooling energy requirement for a building. In this study, heating degree-days (HDD) and cooling degree-days (CDD) are estimated for warm and humid, cool and humid and cold and cloudy climatic zonesof North-East India. The daily maximum and minimum temperature data are collected from RegionalMeteorological Centre, Guwahati. The degree-days are calculated by using three different methods, i.e.ASHRAE formula, UKMO equations and Schoenau-Kehrig method for different base temperatures. It hasbeen found that there is a variation in degree-days obtained from the above methods in the respectiveclimatic zone and also varies from zone to zone. The degree-days are also estimated on hourly basis basedon Typical Meteorological Year (TMY) data for validation. Generalized equations are developed by usingmultiple linear regression technique to estimate the degree-days and those satisfied the statistical testsare proposed. The developed equations can be used to obtain degree-days of locations in same climaticzone for which daily temperature data are not available, with a fair accuracy. © 2014 Elsevier Ltd.

Basumatary S.,Bineswar Brahma Engineering College | Deka D.C.,Gauhati University
International Journal of ChemTech Research | Year: 2014

Transesterification of yellow oleander (Thevetia peruviana) seed oil to its fatty acid methyl esters (FAME, biodiesel) was carried out in methanol by batch reaction using a heterogeneous catalyst derived from the rhizome of Musa balbisiana Colla (one variety of banana plant). The yield of biodiesel obtained is 95 wt.% at room temperature (32 °C) in 3 h. The catalyst is thermally stable and better catalytic activity is observed when it is activated.

Sarmah P.,Gauhati University | Sarmah P.,Bineswar Brahma Engineering College | Das B.K.,Gauhati University
Indian Journal of Chemistry - Section A Inorganic, Physical, Theoretical and Analytical Chemistry | Year: 2014

The supported catalyst produced by immobilising the cobalt(III)-oxo cluster Co4O4(O2CMe)4(py)4 on chemically modified mesoporous silica shows very good activity in the tert-butyl hydroperoxide oxidation of styrene and diphenylmethane. While complete conversion of styrene takes place to yield styrene epoxide at moderate selectivity, diphenylmethane is completely converted to obtain benzophenone at excellent selectivity.

Basumatary S.,Bineswar Brahma Engineering College | Barua P.,Gauhati University | Deka D.C.,Gauhati University
International Journal of ChemTech Research | Year: 2014

Gmelina arborea and Tabernaemontana divaricata seed oils were extracted and transesterified using methanol as the solvent in presence of a catalyst to produce biodiesel. Predictions of four important chemical properties of biodiesel viz. iodine value, saponification number, cetane index and gross heat of combustion were performed following theoretical calculation based upon fatty acid profiles of G. arborea and T. divaricata biodiesels and found to meet the necessary biodiesel standards of ASTM D6751 and EN 14214.

Bora P.,Bineswar Brahma Engineering College | Bora P.,Tezpur University | Konwar L.J.,Tezpur University | Deka D.,Tezpur University
Energy Conversion and Management | Year: 2016

The present investigation aims to highlighten the effect of monoglyceride surfactant (GMO) on structure and dynamic behavior and other fuel characteristics of microemulsion based hybrid biofuels (MHBFs). Fuel quality of MHBFs formulated using purified GMO (>90%), which was prepared by esterification of glycerol, was investigated in the study. Phase behaviors, droplet size distribution, number of droplets present in the system, average droplet size and average length of surface active agents were studied as a part of structural investigations of the GMO based MHBFs. Diffusion coefficient, energy barrier to droplet coalescence and rate of coalescence of droplets were also investigated for the formulated MHBFs. The number of droplets, length of surface active agent and the diffusion co-efficient were in the ranges of 1.87 × 1021-5.66 × 1021/m3, 0.92-1.07 nm and 1.00 × 10-11-1.79 × 10-11 m2/s, respectively. The rate of droplet coalescence was obtained in the range 2.77 × 10-4-8.78 × 10-4 times the collision factor. MHBFs incorporating the glycerol derived bio-based nonionic surfactant GMO exhibited viscosity of 4.12 mm2/s (at 40 °C), gross calorific value (GCV) of 39.17 MJ/kg and pour point of -7 °C. © 2016 Elsevier Ltd. All rights reserved.

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