Browsing by Author "Kumar, Arun"

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    Alloyed monolayers of Cu, Ag, Au and Pt in hexagonal phase: A comprehensive first principles study
    (Elsevier Ltd, 2018) Kapoor, Pooja; Kumar, Arun; Sharma, Munish; Kumar, Jagdish; Kumar, Ashok; Ahluwalia, P. K.
    We present density functional theory (DFT) based comprehensive study of two-dimensional (2D) alloyed monolayers of noble metals (AgCu, AgPt, AgAu, AuCu, AuPt and CuPt) in hexagonal phase within numerical atomic orbitals and plane wave basis sets methods. The monolayers considered exhibit positive phonon frequencies suggesting them to be dynamically stable. The Pt containing alloyed monolayers have superior structural stability (binding energy and tensile strength) and exhibit metallic and ferromagnetic character amongst all the alloyed monolayers. Interestingly, alloying of Au monolayer with Cu and Ag show semiconducting behavior whereas alloyed AgCu monolayer posseses Dirac-cone like features at high symmetry points. These distinct features in electronic structures of alloyed 2D monolayers have been captured in STM like set up. An anisotropic behavior has been observed in dielectric spectra for all the considered structures. Tunneling characteristics show NDR region for Pt containing alloyed monolayers. The considered alloyed monolayers may potentially be useful as a building blocks for the applications in nano- and opto-electronics. ? 2017 Elsevier B.V.
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    CUSTOMER RELATIONSHIP MANAGEMENT (CRM) IN THE PUBLIC AND PRIVATE SECTOR BANKS IN BIHAR: A COMPARATIVE STUDY
    (Conscientia Beam, 2021-12-27T00:00:00) Kumar, Indrajit; Shome, Mihir Kumar; Verma, Jainendra Kumar; Kumar, Arun
    Customer relationship management (CRM) plays a crucial role in any organization because success or failure depends on a company�s relationship with its customers. The objective of this study is to see how CRM can play an important role in the public and private sector banks in Bihar, India. The sample for the study consists of 250 bank managers from both public and private sector banks in Bihar. A CRM questionnaire developed by the researchers was used to measure CRM in the banking sector. Data were analyzed using SPSS software. Inferential statistics including t-test and analysis of variance (ANOVA) were used to analyze the data. The t-test results show that both the public and private sector banks differ significantly in the variables of customer contact by phone/e-mail, customer care, and innovation and quality. The ANOVA results showed that the four groups (public sector males, public sector females, private sector males, and private sector females) differed significantly in the eight variables (commitment; citizenship behavior; customer contact by phone/e-mail; planning; improved retention & better targeting of new customers; top management support; innovation and quality; and technological readiness. � 2021 Conscientia Beam. All Rights Reserved.
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    Electronic, Mechanical, and Dielectric Properties of Two-Dimensional Atomic Layers of Noble Metals
    (Springer New York LLC, 2017) Kapoor, Pooja; Kumar, Jagdish; Kumar, Arun; Kumar, Ashok; Ahluwalia, P. K.
    We present density functional theory-based electronic, mechanical, and dielectric properties of monolayers and bilayers of noble metals (Au, Ag, Cu, and Pt) taken with graphene-like hexagonal structure. The Au, Ag, and Pt bilayers stabilize in AA-stacked configuration, while the Cu bilayer favors the AB stacking pattern. The quantum ballistic conductance of the noble-metal mono- and bilayers is remarkably increased compared with their bulk counterparts. Among the studied systems, the tensile strength is found to be highest for the Pt monolayer and bilayer. The noble metals in mono- and bilayer form show distinctly different electron energy loss spectra and reflectance spectra due to the quantum confinement effect on going from bulk to the monolayer limit. Such tunability of the electronic and dielectric properties of noble metals by reducing the degrees of freedom of electrons offers promise for their use in nanoelectronics and optoelectronics applications. ? 2016, The Minerals, Metals & Materials Society.
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    A New Approach to Punjabi Text Steganography using Naveen Toli
    (Department of Computer Science & engineering, NITTTR,, 2017) Kumar, Arun; Kaur, Amandeep
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    A Novel Approach for Information Hiding in Punjabi Language
    (Central University of Punjab, 2016) Kumar, Arun; Kaur, Amandeep
    The Internet is global in scope and rapidly growing. With this growth, internet security threats are also increasing. The Internet is the global information exchange media, which is open and insecure, needs more and better security provision. In the era of computer network virtually all business, government and academic organizations interconnect their local area network with a collection of interconnected networks. Data transmission in a public communication system is not secure because of interception and improper manipulation by an opponent Therefore, the attractive solution for this problem is steganography, which is the art and science of writing concealed messages in such a way that no one, apart from the sender and intend recipient, can notice the existence of the message. Thus, confidentiality and integrity principle of security can be achieved. There have been wide ranges of algorithms introduced using a text file as cover media. This thesis explains a two layered hiding technique that provides high security than other techniques. The use of local language ensures more security to the information exchange as the awareness of the local language is limited. The proposed approach uses the local language Punjabi as cover text. In proposed approach, the cover media is pre-existing media, not system generated media. Therefore, a user will be free to use the cover media taken from any Punjabi newspaper, magazine or book and the syntax of a sentence and sequence of sentence both will be true grammatically. Even though the opponent has a very good command on the Punjabi language, they will not found any suspicious.
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    Recent advances in microwave-assisted nanocarrier based drug delivery system: Trends and technologies
    (Editions de Sante, 2023-08-09T00:00:00) Virlley, Shachi; Shukla, Shipra; Arora, Sanchit; Shukla, Deeksha; Nagdiya, Deepak; Bajaj, Tania; Kujur, Sima; Garima; Kumar, Arun; Bhatti, Jasvinder Singh; Singh, Arti; Singh, Charan
    Microwave irradiation technology has a lot of applications in the field of food processing, organic synthesis, pharmaceuticals, and biomedical therapy. The basic mechanisms observed in microwave-assisted syntheses are dipolar polarization and conduction. Of late, it has gained tremendous attention in the synthesis of drug delivery systems for enhanced solubility, dissolution rate, and biopharmaceutical attributes. Considering the myriads of advantages over conventional heating such as high percentage yield, lesser reaction time, deep penetration of heat, and improved product quality; microwave-assisted technology holds potential in the development of nano- and microparticle-based drug delivery systems with improved physicochemical characteristics and thereby, bioavailability. In this review, we have discussed the formulation of drug delivery systems which includes lipidic, polymeric, metallic, and micellar nanoparticles. We have also summarized solid dispersion, dendrimers, and carbon nanotubes in this manuscript. However, it is possible to expedite the extraction process, save expenses, and increase the effectiveness, reliability, and simplicity of responses. Therefore, microwave technology provides a new avenue for the development of drug delivery systems in various biomedical applications. � 2023 Elsevier B.V.