Pandu College

Guwāhāti, India

Pandu College

Guwāhāti, India
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Bora S.J.,Pandu College | Paul R.,Pandu College | Nandi M.,Gauhati University | Bhattacharyya P.K.,Arya Vidyapeeth College
Journal of Solid State Chemistry | Year: 2017

This work describes the synthesis of a new 2-D coordination polymer (CP), [Co3(btc)2(dmp)8]n (btc = 1,3,5-benzenetricarboxylate and dmp = 3,5-dimethylpyrazole) and its catalytic activity towards the oxidation reaction of 1-hexene to form oxygenated compounds under solvent free condition. Structural analysis reveals that Co(II) cations in this polymeric compound are linked by btc3- anions with alternate tetrahedral/octahedral coordination forming a two-fold interpenetrated 3-connected hcb underlying net. Electronic spectrum of the cobaltous polymer has been calculated using TDDFT/B3LYP method for making the appropriate assignments of electronic transitions. Catalytic results show good conversions of the starting material to oxygenated products with high selectivities for 1,2-epoxyhexane and 1-hexanal. © 2017


Paul R.,Pandu College | Guha A.K.,Assam University | Saikia L.,North East Institute of Science and Technology | Bora S.J.,Pandu College
Journal of Solid State Chemistry | Year: 2017

Four new nitrito-bridged coordination polymers of formulation [Zn(NO2)2(H2O)2]n (1) and [M(bipy)(NO2)2]n [M = Zn (2), Co (3), Mn (4)] were synthesized under solvothermal condition using N,N-dimethylformamide (DMF) as a reducing solvent. Theoretical calculation suggests in situ reduction of nitrate to nitrite with high spontaneity and without any thermodynamic barrier (ΔG = −20.4 kcal/mol). All the complexes were characterized by elemental analysis, FT-IR spectroscopy, UV–vis spectroscopy, Raman Spectroscopy, TG analysis as well as by single crystal X-ray diffraction methods. TD-DFT approach has been employed to assign the electronic transitions occurring in the cobalt(II) complex (3) and were compared with those observed experimentally. This work also describes the preliminary studies on heterogeneous oxidation of cyclohexene by 2&3 in acetonitrile medium using TBHP. © 2017


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.


Kalita M.C.,Pandu College | Saikia H.K.,Gauhati University
Journal of Intelligent and Fuzzy Systems | Year: 2016

Notion of singular fuzzy ideals of commutative rings is introduced in this paper. These singular fuzzy ideals are defined via essential fuzzy ideals. Various characteristic features of such ideals to establish relationship between fuzzy non singularity and fuzzy semiprime character of commutative rings are presented. © 2016 - IOS Press and the authors. All rights reserved.


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..


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.


Sarmah R.,Pandu College
Transactions of the Institute of Indian Geographers | Year: 2016

This study attempts to estimate rate of sediment yield in a small size floodplain catchment with little physiographic and high climatic variations. Sediment yield rates are estimated adopting a field based conventional methodfor the period 2009-14. It has been estimated that rate ofsediment yield in the study area is 618 t/km2/y. The average rate ofsediment yield is estimated to be 4l7t/km2/y at gully-1, 451 t/km2/y at gully-2, 865 t/km2/y at gully-3, and 742 t/km2/y at gully-4 with an average of 618 t/km2/y for all gullies during 2009-14. Rate ofsediment yield is increasing downstream in the order of8t/km2/y/km primarily because of downstream fining of soil texture and increasing saturation level of the ground. It is found that rainfall of ground saturated period (July to October) has increased by 318mm (49%) during 2009-10 which yielded increase insediment yield of 127 t/km2/y (23%). This relation in 2010-11 became 266mm (27%) to 85 t/km2/y (12%) and in 2011-2014 36mm (3%) to 32 t/km2/y (5%). Thus, sediment yield rate is strongly determined by variation in rainfall of ground saturated period. It id also found that high rate of sediment yield in the stuy area is basically because of floodplain character ofthe basin with high anthropogenic interventions by tillaging the agricultural lands during the high runoff period. Study area is intensively cultivated, and thuspersistency ofthis high sediment yield rate will invitehazardslike drainage congestion, channel shifting, flood, etcajfecting agricultural practicesin recent future.


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.


Bora S.J.,Gauhati University | Bora S.J.,Pandu College | Das B.K.,Gauhati University
Journal of Solid State Chemistry | Year: 2012

Metal fumarates are often studied in the context of metal organic framework solids. Preparation, structure and properties of three cobalt(II) fumarates, viz. [Co(fum)(H 2O) 4]·H 2O 1, [Co(fum)(py) 2(H 2O) 2] 2, and [Co(fum)(4-CNpy) 2(H 2O) 2] 3 (fum=fumarate, py=pyridine, 4-CNpy=4-cyanopyridine) are described. All three are chain polymers involving bridging fumarato ligands between each pair of octahedral Co(II) centres, but while the first one is zigzag in structure, the latter two are linear. Indexed powder X-ray diffraction patterns, solid state electronic spectra and magnetic properties of the species are reported. Thermal decomposition behaviour of the compounds suggests that they may be suitable as precursors to make Co 3O 4 via pyrolysis below 600 °C. © 2012 Elsevier Inc. All rights reserved.


Sharma M.,Pandu College | Ganguly M.,Cotton College
Research Journal of Chemistry and Environment | Year: 2010

A new non-edible low cost feedstock for the production of biodiesel is reported. The study shows that the seeds of shaddock which have high oil content, can be used as a potential feedstock for the production of biodiesel. The study reveals that the methyl ester obtained from shaddock oil fulfils most of the requirements of a biodiesel fuel. The physicchemical parameters of the oil and the methyl esters are presented.

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