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Hazarika B.J.,Pandu College | Choudhury D.K.,Gauhati University
Pramana - Journal of Physics | Year: 2010

We used variationally improved perturbation theory (VIPT) in calculating the slope and curvature of Isgur-Wise (I-W) function with the Cornell potential-4α s/3r + br + c instead of the usual stationary state perturbation theory as done earlier. We used-(4α s/3r), i.e. the Coulombic potential, as the parent and the linear one, i.e. br + c as the perturbed potential in the theory and calculated the slope and curvature of Isgur-Wise function including three states in the summation involved in the first-order correction to wave function in the method. © Indian Academy of Sciences. Source


Sarma A.,Pandu College | Sarma H.,Nn Saima College
Journal of Environmental Science and Technology | Year: 2013

The aim of the study was to determine the herbage yield and oil content of Mentha citrata Ehrh. an important medicinal and aromatic herb in the Brahmaputra valley agro-climatic zone (northeastern India) using different spacing (density) with or without irrigation. The cultivation trials were done using vegetative sucker for two consecutive years. The size of the experimental beds was 7.2×3.6 m and these were raised (10 cm from land surface) to prevent water logging during the rainy season. Suckers were planted in them with different spacings and accommodated 285, 247, 209, 190 and 181 numbers of suckers in five different plant densities, namely, 40×25, 40×30, 40×35, 40×40 and 40×45 cm respectively with three replications. While the herbage yield varied with irrigation and without irrigation treatment respectively, no variation in oil content was, however, recorded. Herbage and oil yield in M. citrata were enhanced when the crop was planted in 40×35 cm spacing with irrigation in comparison to other trials. The present study shows that the herb yield percent was highest in 40×35 cm spacing during both years (21.84±0.03-21.68±0.21) and the mean oil yield percent ranged from 0.61-0.63% with or without irrigation. © 2014 Asian Network for Scientific Information. Source


Hazarika B.J.,Pandu College | Pathak K.K.,Arya Vidyapeeth College | Choudhury D.K.,Gauhati University
Modern Physics Letters A | Year: 2011

We study heavy light mesons in a QCD inspired quark model with the Cornell potential 4S 3r. Here we consider the linear term br as the parent and i.e. the Coloumbic part as the perturbation. The linear parent leads to Airy function as the unperturbed wave function. We then use the Dalgarno method of perturbation theory to obtain the total wave function corrected up to first order with Coulombic piece as the perturbation. With these wave functions, we study the IsgurWise function and calculate its slope and curvature. © 2011 World Scientific Publishing Company. Source


Sarmah R.,Pandu College
Geomorphology | Year: 2012

This study aims at estimating the rate of bed aggradation of the Jia Dhansiri River in Assam, India. It is carried out using two methods: (1) measurement of channel cross section in the field, and (2) measurement of variously dated maps for the period 1995-2006. Following these two methods, data on parameters pertaining to bed aggradation are generated and authenticated by comparison. Data on total bed aggradation during 1995-2006 are extrapolated from cross section graphs and again verified with a model proposed in this paper based on average water level of base year and current year and total bed aggradation. The rates of bed aggradations are 5.27. cm/y at Dhansiri Khuti village, 5.09. cm/y at Barigain village, 5.27. cm/y at Bagishakash village, and 2.64. cm/y at Thalthali village. No degradation zones are found in between during the study period except in minor magnitude and localized cases. If these rates of bed aggradation are continued and no significant changes in the channel morphology occur, then the river bed may merge with the low river bank after 11. years at Dhansiri Khuti village, 17. years at Barigaon village, 6. years at Bagishakash village, and 7. years at Thalthali village. The average channel aggradation during 11-years of period in the 16-km reach has estimated to be 3.65. cm/y. Again, if this rate is continued then the river bed will overtop low banks of the 16-km reach after 16. years. At this situation the river may attain a state of geomorphic threshold which may be channel shift following vulnerable slope(s). © 2011 Elsevier B.V.. Source


Hazarika B.J.,Pandu College | Choudhury D.K.,Gauhati University
Pramana - Journal of Physics | Year: 2012

We have recently reported the calculation of slope and curvature of Isgur-Wise function based on variationally improved perturbation theory (VIPT) in a quantum chromodynamics (QCD)- inspired potential model. In that work, Coulombic potential was taken as the parent while the linear one as the perturbation. In this work, we choose the linear one as the parent with Coulombic one as the perturbation and see the consequences. © Indian Academy of Sciences. Source

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