Amritsar, India

Guru Nanak Dev University
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.

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The fission fragment mass distribution followed by neutron emission is studied for the Pb208(O18,f) reaction using the asymmetric two centre shell model. The measured mass distribution spectrum reveals new kind of systematics on shell structure and leads to an improved understanding of structure effects in nuclear fission. A detailed investigation of shell effects both in potential and cranking mass parameter has been carried out for explaining the observed fine structure dips (i.e., less probable distributions) corresponding to shell closure (Z=50 and/or N=82) of fission fragments and their complementary partners. The available energy states for the decay process are obtained by solving the Schrödinger equation and found that first-five eigenstates are sufficient in reproducing the observed mass distribution spectrum. An outcome of the asymmetric two centre shell model also completely favours the observed claim that “the total number of emitted neutrons between correlated pairs of fission fragments should not exceed 6”. A complete observed spectrum is obtained by adding the mass distribution yields of all 6-neutron emission channels. This suggests a possible importance of extending these calculations to get new insight into an understanding of the dynamical behaviour of fragment formation in the fission process. © 2017

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.

Sareen D.,Guru Nanak Dev University | Kaur P.,Guru Nanak Dev University | Singh K.,Guru Nanak Dev University
Coordination Chemistry Reviews | Year: 2014

Recent time has witnessed unprecedented activity in the colorimetric sensing because of its low cost, practicability, selectivity as well as sensitivity. In addition to the ease in visual "naked eye" qualitative assessment of the colorimetric sensing events, the quantification can be done by resorting to spectrophotometric analysis. Additionally, a number of smart materials based on nanoparticles, carbon nanotubes, mesoporous materials, synthetic pores, conjugated polymers, etc. have been developed and used for colorimetric detection. Herein, we focus on the recent developments (last five years) in colorimetric sensing using dyes. © 2014 Elsevier B.V.

Singh K.,Guru Nanak Dev University
Advances in Heterocyclic Chemistry | Year: 2012

The realization of therapeutic potential of 3,4-dihydropyrimidin-2(1. H)-ones (DHPMs) and their structural as well as receptor bound conformational similarity with potent cardiovascular 1,4-dihydropyridines created renewal interest in recent years. A plethora of variants of their typical three-component one pot condensation often referred to as Biginelli condensation, as well as structural diversification to harness molecular diversity is now reviewed. © 2012 Elsevier Inc..

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.

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.

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.

Bhalla V.,Guru Nanak Dev University | Gupta A.,Guru Nanak Dev University | Kumar M.,Guru Nanak Dev University
Organic Letters | Year: 2012

Novel pentacenequinone derivative 3 has been synthesized using the Suzuki-Miyaura coupling protocol which forms fluorescent nanoaggregates in aqueous media due to its aggregation-induced emission enhancement attributes and selectively senses picric acid with a detection limit of 500 ppb. © 2012 American Chemical Society.

Chauhan P.,Guru Nanak Dev University | Chimni S.S.,Guru Nanak Dev University
Chemistry - A European Journal | Year: 2010

(Figure Presented) Simple and selective: An efficient organocatalytic enantioselective method for the synthesis of substituted-3-hydroxyoxindole derivatives with a quaternary chiral carbon has been developed. The cinchona alkaloid derived catalyst catalyses the Friedel Crafts-type addition of indole derivatives to the isatin derivatives under mild conditions to provide substituted 3-hydroxyoxindoles in good to excellent yields with high enantioselectivity (see scheme). © 2010 Wiley-VCH Verlag GmbH&Co. KGaA, Weinheim.

Kumar N.,Guru Nanak Dev University | Bhalla V.,Guru Nanak Dev University | Kumar M.,Guru Nanak Dev University
Coordination Chemistry Reviews | Year: 2013

The identification of small gaseous molecules, nitric oxide (NO), carbon monoxide (CO) and hydrogen sulfide (H2S) as signal transmitters in living systems has revealed that these endogenously produced gases perform essential biological functions and are associated with various diseases of human concern. However, for the advancement of our understanding into the physiological and pathological roles played by these signal transductors, it is desirable to develop sensitive and specific techniques for the detection of these biological messengers. The detection method based on fluorescent molecular probes provides a proficient approach for the visualization of these gaseous molecules with respect to their production, function and adverse effects. The aim of this review is to highlight the recent developments in the field of fluorescent probes for the detection of gasotransmitters and to provide a general overview of fluorescent sensors designed for NO, CO and H2S. © 2013 Elsevier B.V.

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