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Amritsar, India

Guru Nanak Dev University was established at Amritsar, India on November 24, 1969 to commemorate Guru Nanak Dev's birth quincentenary celebrations. Guru Nanak Dev University campus is spread over 500 acres near village of Kot Khalsa, nearly 8 km west of the Amritsar City on Amritsar - Lahore highway, next to Khalsa College, Amritsar. Recently, Guru Nanak Dev University has attained the highest status of University with Potential for Excellence by the University Grants Commission . G.N.D.U. is both a residential and an affiliating University. In conceiving the future course of the University, the objectives enshrined in the Act 1969, emphasized that the new university would make provision for imparting education and promoting research in the humanities, learned professions, science, especially of applied nature and technology. Studies and research on the life and teachings of Guru Nanak, in addition to working towards the promotion of Punjabi language and spreading education among educationally backward classes and communities were the other commitments. Wikipedia.

Singh H.,Guru Nanak Dev University
International Journal of Heat and Mass Transfer | Year: 2012

Electrical discharge machining (EDM) has steadily gained importance over the years because of its ability to cut and shape a wide variety of materials and complicated shapes with high accuracy. The effectiveness of the EDM process is evaluated in terms of the material removal rate, relative wear ratio and the surface roughness of the work piece. The input discharge energy during this process is distributed to various components of the process, which further influences the material removal rate and other machining characteristics like surface roughness. Since during this process the electrical energy is converted into heat energy, hence the theoretical modeling of this process is based upon the heat transfer equations and in all existing thermal models the fraction of the energy transferred to the workpiece, is one of the important parameters. The accurate prediction of the fraction of energy effectively transferred to the workpiece will help to reduce the errors of the thermal models. In this study experiments have been performed to study the percentage fraction of energy transferred to the workpiece utilizing heat transfer equations, at different EDM parameters. This study also relates the optimum parameters with the optimum utilization of input discharge energy and hence will help to improve the technological performance of this process. © 2012 Elsevier Ltd. All rights reserved.

Kaur N.,Panjab University | Kumar S.,Guru Nanak Dev University
Tetrahedron | Year: 2011

Colorimetric sensors allow on site, real time qualitative, and semi-quantitative detection without complicated analytical instruments. Various aspects, such as different color changes, metal induced absorptions shifts, are reviewed. © 2011 Elsevier Ltd.

Kumar R.,Korea University | Kumar R.,Korea University | Lee Y.O.,Korea University | Bhalla V.,Guru Nanak Dev University | And 2 more authors.
Chemical Society Reviews | Year: 2014

Thiacalixarenes, a subclass of "third generation" calixarenes, exhibit many interesting features such as enlarged ring size, facile chemical modification, and metal complexation due to the presence of bridging sulfur atoms. The thiacalixarene scaffold is a unique host with vast possibilities for functionalization not only at the upper and lower rim but also at the bridging sulfide groups. Modified thiacalixarenes have been used for many applications such as the detection and separation of biologically important cations, anions, and bio-analytes, mimicking molecular logic gates and devices, and synthesis of self-assembled coordination cages, multinuclear complexes, magnetic materials and luminescent materials. This review article summarizes recent developments in the derivatization methods of thiacalixarenes and their utilization in various applications. © 2014 The Royal Society of Chemistry.

Singh K.,Guru Nanak Dev University | Arora S.,Guru Nanak Dev University
Critical Reviews in Environmental Science and Technology | Year: 2011

Azo dyes represent the largest class of industrial colorants. These are no longer used only for the coloration of textiles, plastics, paints, inks, and lacquers, but rather serve as key components in high-tech applications such as optical data storage, reprographics, display devices, dye-sensitized solar cells, energy transfer cascades, light-emitting diodes, laser welding processes, or heat management systems. Azo dyes are also of growing importance in the medical and biomedical fields. In most of these applications, the color is largely irrelevant and it is the ability of the colorants to absorb visible electromagnetic radiation with high efficiency, or other functional property, that is exploited. With the growing awareness and environmental concerns, it is imperative that the hierarchy of reduce, reuse, and degrade be adopted and measures be taken to remove color from the industrial discharge. The present review (a) embodies a comparison of the present decolorization/degradation techniques for water-soluble and insoluble dyes, (b) describes their advantages and limitations, (c) discusses various mechanisms, and (d) focuses on the present literature on microbial decolorization of textile dyes specifically by using bacteria, fungus, yeast, and algae. Also, for the first time an attempt has been made to comprehensively compile chemical and biological decolorization/degradation of disperse dyes. The research on the decolorization of textile dyes has mainly been focused on water-soluble dyes, while decolorization of disperse dyes that are water insoluble have received only scant attention and constitutes a topical area of concern as these dyes persist for a longer duration in textile effluents. Given the limitations (vide infra) of the chemical treatment methods, decolorization using biological means is an interesting option. © 2011 Taylor and Francis Group, LLC.

Chauhan P.,Guru Nanak Dev University | Chimni S.S.,Guru Nanak Dev University
Tetrahedron Asymmetry | Year: 2013

3-Amino-2-oxindoles bearing tetra-substituted stereocenter are very important constituents of many bioactive and pharmaceutical agents. In the last few years, asymmetric organocatalysis emerged as an excellent approach for the synthesis of optically active 3-substituted-3-amino-2-oxindoles. This review describes the various organocatalytic enantioselective strategies for the synthesis of 3-substituted 3-amino-2-oxindole frameworks. © 2013 Elsevier Ltd. All rights reserved.

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