Dibrugarh, India
Dibrugarh, India

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Mohan U.,Dhsk College | Gogoi P.,Tinsukia College | Baruah S.K.,Dibrugarh University
Oriental Journal of Chemistry | Year: 2016

Solid charge transfer complex of n-donor 3, 5-dimethylpyridine (3, 5-Lutidine) with s acceptor iodine was prepared and characterised by using elemental analysis, UV-Vis, FTIR,1 H NMR spectroscopy and powder XRD techniques. The electrical parameters of the prepared complex in the pellet form were studied at various temperatures and at wide frequency range by employing AC complex impedance spectroscopic technique. The Nyquist (cole-cole) plots have been successfully explained by employing (RC)(RC)(RC) equivalent circuit corresponding to grain , grain boundary and electrode contributions. The radii of the semicircular arc decrease with increase in temperature which suggests that the material exhibits negative temperature coefficient of resistance (NTCR) behaviour like semiconductors. Dielectric constant, e' and dielectric loss, e'' seems to decrease sharply with increase in frequency. The ac conductivity obeys the power law of frequency.


Changmai R.,Dhsk College
Asian Journal of Spectroscopy | Year: 2012

Laser induced fluorescence in polyvinyl type of polymers has been excited with the help of Ar + laser (5145Å). The quenching of a part of positive band of molecular nitrogen in the region 6068.5̊ and 6545A has been observed. For comparison the first positive band of N 2 excited in discharge tube observed in the polymer samples. This indicates that these lines are not subjected to quenching.


Ahmed N.,Dhsk College | Das S.,Dibrugarh University | Purusotham S.,Svj College
OPSEARCH | Year: 2012

The paper aims at obtaining an optimal route of a fleet of oildelivery tankers from a source to a number of service stations. The distance between any two stations and demand(s) for each station are given. The objective is to find an optimal route undertaken by tankers such that the requirements of stations are met, the total distance travelled by the Tankers and the backload of the Tankers is to be minimized under the considerations. Also, the Tanker should visit a pair of stations exactly once. Further, a tanker does not supply the requirements of the stations partially. Here the tanker carries back the residue to the depot the available amount of oil will be considered as Backload or undelivered oil when the Tanker returns to depot (source station) or the maximum utilization of the capacity of Tankers in a trip schedule. Dantzig and Ramser-[4] investigated the problem of "The Truck Dispatching Problem" without the minimum backload and obtained a near optimal solution with the dynamic programming approach. For obtaining the optimal solution of the same problem with minimum backload, we proposed the Lexicographic Search approach. The algorithm is tested using C-language and the computational details are also reported, observed that it takes less computational time for higher size of problems. © Operational Research Society of India 2012.


Ahmed N.,Dhsk College | Das S.,Dibrugarh University | Purusotham S.,Vellore Institute of Technology
OPSEARCH | Year: 2013

The routing problems pertain to the search for a shortest route (minimum cost or minimum distance or maximum flow, etc.) connecting two specified stations or nodes described as 'source' and 'sink'. The paper aims at obtaining an optimal route of a more realistic situation as to scheduling maximum flows at a minimum cost from a source to a destination. The distance (cost) and arc capacity between any two stations are given. The objective is to find the maximum flow with the minimum cost from the source to the destination in a network. The problem has many applications in the field of network flow theories. Several special cases of the problem were intensively studied in the literature and proposed various techniques to solve. Here we solved the present problem by the lexicographic search technique, which gives the exact solution to the problem. The solution procedure is illustrated with a suitable example. The algorithm is also tested in C-language and the computational details are also reported. © 2012 Operational Research Society of India.


Canonical correlation analysis seeks to identify and quantify the associations between two sets of variables. Harold Hotelling, who initially develo ed the technique, rovided the exam le of relating arithmetic s eed and arithmetic ower to reading s eed and reading ower. Relating governmental olicy variables with economic goal variables and relating college erformance variables with recollege variables are other exam les of thistye. Canonical correlation analysis focuses on the correlation between a linear combination of the variables in one set and a linear combination of the variables in another set. The idea is first to determine the air of linear combinations having the largest correlation. Next, we determine the air of linear combinations having the largest correlation among all airs uncorrelated with the initially selected air. The rocess continues. The airs of linear combinations are called the canonical variables, and their correlations are called canonical correlations. The canonical correlations measure the strength of association between the two sets of variables. The maximization as ect of the technique re resents an attem t to concentrate a high-dimensional relationshi between two sets of variables into a few airs of canonical variables. An attem t has been made here to analyse the jointly roduced goods crude oil and etroleum roducts using linear and log-linear estimation based on Harold Hotelling canonical correlation a roach and to com are these two estimation rocedures among themselves. The analysis suggests that loglinear estimation is su erior to the linear estimation for such ty e of study. © 2012 Operational Research Society of India.


Changes in botanical names of flowering plants are an issue which comes up from time to time. While there are valid scientific reasons for such changes, it also creates some difficulties to the floristic workers in the preparation of a new flora. Further, all the important monumental floras of the world have most of the plants included in their old names, which are now regarded as synonyms. In north east India, "Flora of Assam" is an important flora as it includes result of pioneering floristic work on Angiosperms & Gymnosperms in the region. But, in the study of this flora, the same problems of name changes appear before the new researchers. Therefore, an attempt is made here to prepare an updated account of the new names against their old counterpts of the plants included in the first two volumes of the flora, on the basis of recent standard taxonomic literatures. In this, the unresolved & controversial names are not touched & only the confirmed ones are taken into account. In the process new names of 470 (four hundred & seventy) dicotyledonous plant species included in the concerned flora are found out.


All the major monumental floras of the world have most of the plants included in their old names, which are now regarded as synonyms. In north east India, "Flora of Assam" is an important flora as it includes result of pioneering floristic work on Angiosperms & Gymnosperms in the region. But, in this flora, the same problems of name changes appear before the new researchers. Therefore, an attempt is made here to prepare an updated account of the new names against their old counterparts of the plants included in the 3rd & 4th volumes of the flora, on the basis of recent standard taxonomic literatures. Earlier, the name changes of the plants included in the 1st & 2nd volumes are already published & this is the second part of the work. In this, the unresolved names are not touched & only the confirmed ones are taken into account. In the process new names of 531 dicotyledonous plant species included in the concerned flora are compiled out. © 2014, Plant Archives. All rights reserved.

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