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Singh H.,Guru Nanak Dev University | Khosla H.,Guru Nanak Dev University | Walia G.S.,Guru Nanak Dev University | Sidhu T.S.,S.B.S.C.E.T | And 2 more authors.
Surface Engineering | Year: 2017

The surface properties of metals and alloys are usually altered by spray coating techniques for better performance in extreme conditions such as: erosive-corrosive and wear applications. In this study a wear and corrosion resistant coating composition of 75% Cr3C2-25% (Ni-20%Cr) was selected for cold spraying on N06601superalloy which can sustain in high-temperature applications. Microstructure properties of cold sprayed coating depend upon the composition and mechanical–physical properties of both coating and substrate materials, and cold spraying of brittle carbide-based materials is still a challenge for researchers. Various spray parameters were adjusted in this study to produce a 289 µm thick, smooth and dense (porosity less than 1) cold sprayed coating on 601-alloy with high hardness of 866 HV. For mitigating the erosion–corrosion phenomenon the coating microstructure is as important as its composition. This coating structure is suitable for further testing in high temperature and extreme corrosive conditions. © 2017 Institute of Materials, Minerals and Mining. Published by Taylor & Francis on behalf of the Institute


Goyal T.,Punjab Technical University | Walia R.S.,PEC University of Technology | Sidhu T.S.,SBSCET
International Journal of Advanced Manufacturing Technology | Year: 2012

In this paper, Taguchi L 18 orthogonal array have been employed for depositing the electro-conductive coatings by varying various process parameters, i.e., substrate material, type of powder feeding arrangement, stagnation gas temperature, stagnation gas pressure, and stand-off distance. The response parameter of the coatings so produced is measured in terms of surface roughness. The optimum process parameters are predicted on the basis of analyses (ANOVA) of the raw data and signal to noise ratio. The significant process parameters in order of their decreasing percentage contribution are: stagnation pressure, stand-off distance, substrate material, stagnation temperature of the carrier gas, and feed arrangement of the powder particles, respectively. © 2011 Springer-Verlag.


Goyal T.,Punjab Technical University | Sidhu T.S.,SBSCET | Walia R.S.,PEC University of Technology | Sidhu H.P.S.,Shaheed Udham Singh Women Engineering College
Materials Science and Technology Conference and Exhibition 2011, MS and T'11 | Year: 2011

The cold Spray coating process accelerates powder particles by using a stream of compressed supersonic gas jet to a temperature which is always lower than the melting point of the powder particles to be sprayed, thereby forming a coating in the solid state. This process uses the kinetic energy of the impacting particles to produce the necessary plastic deformation to form the coating. This study reveals the successful low pressure cold spray deposition of near-uniform, defect free and dense copper coatings approximately 700-1900 μm thick, on Al (ASTM B221) alloy for electro-technical applications. The micro structural characteristics of the deposits have been studied using the combined techniques of X-ray diffraction (XRD), scanning electron microscopy (SEM), and energy dispersive X-ray spectroscopy (EDS) and electron-probe micro analysis (EPMA). The coatings exhibited characteristic splat-like, layered morphologies due to the deposition of solid powder particles which appeared to have been plastically deformed on impact to the substrate. The coatings have been made by varying the input process parameters such as feed type, air stagnation temperature, air stagnation pressure and stand-off distance. The developed coatings have a dense and nearly uniform microstructure, with almost uniform hardness values in the range of 120-140 Hv, and electrical conductivity in the range of 23-30 MS/m. EDAX, XRD and EPMA results revealed that the main constituent in the coating is Cu. A very small fraction of phases of other elements has formed in the coating structure in the form of either inter-splat lamellae or globules. Copyright © 2011 MS&T'11®.


Goyal T.,Punjab Technical University | Walia R.S.,PEC University of Technology | Sidhu T.S.,SBSCET
Materials and Manufacturing Processes | Year: 2012

In this research article, Taguchi L 18 orthogonal array has been employed for depositing electro-conductive coatings by varying process and material parameters, i.e., type of powder feeding arrangement, substrate material, stagnation gas temperature, stagnation gas pressure, and standoff distance. The response parameter of the low-pressure cold spray coatings produced is measured in terms of coating density. The analyses of the raw data and signal-to-noise (S/N) ratio of the response parameters have been performed using analysis of variance (ANOVA). The optimum parameters are predicted on the basis of analyses of the raw data and S/N ratio. It was found that the experimental conditions that provide better coating density are expected to also show a strong S/N ratio. The percentage contribution of the various parameters in regard to coating density as response parameter has also been predicted. The significant parameters in order of their decreasing percentage contribution are: substrate material, standoff distance, stagnation temperature, stagnation pressure of the carrier gas, and feed arrangement of powder particles, respectively. © 2012 Copyright Taylor and Francis Group, LLC.


Kaur K.,MIMIT | Mehra R.,National Institute of Technology Jalandhar | Tyagi A.K.,S.B.S.C.E.T
International Journal of Applied Engineering Research | Year: 2013

This review presents a theoretical comprenhensive report on the microstructural and synthesis of nanomaterial barium titanate.The fundamental of barium titanate are discussed followed by the application of nanomaterials.Different method for the synthesis, characterization of barium titanate are presented and discussed.The article attempt to provide a comprehensive review of the current state of art of physical and microstructural properties of nanomaterials.


Bhandari A.,National Institute of Technology Jalandhar | Sangal A.L.,National Institute of Technology Jalandhar | Saluja K.K.,SBSCET
Lecture Notes in Computer Science (including subseries Lecture Notes in Artificial Intelligence and Lecture Notes in Bioinformatics) | Year: 2012

Distributed Denial of Service (DDoS) attack is one of the biggest threats now days. This paper aims at providing the simulation results of buffer size and attack intensities effects on various queuing algorithms such as Drop Tail, Fair Queuing (FQ), Stochastic Fair Queuing (SFQ), Deficit Round Robin (DRR) and Random Early Detection (RED) using ns-2 as a simulation environment. The results in this paper indicate that Stochastic Fair Queuing is the best algorithms in terms of providing maximum bandwidth to legitimate users against various attack intensities. It is also cleared from simulation results that there is no effect of variation in buffer size on queuing algorithms such as Fair Queuing, Stochastic Fair Queuing and Deficit Round Robin while DropTail and Random Early Detection algorithms are giving the best performance on buffer size 60 against various attack intensities. © 2012 Springer-Verlag.


Kaur M.,SBSCET | Rajni,SBSCET | Singh P.,CGC
Advances in Intelligent Systems and Computing | Year: 2012

Adhoc networks are the networks, deployed in the areas where the needed infrastructure is not feasible to install. Mobile Adhoc Networks (MANETs) use wireless medium in which each node acts as both data terminal and router without the need of any centralized control. Vehicular Adhoc Networks (VANETs) are subset of MANETs. The successful deployment of vehicular communication requires Vehicle-to-Vehicle (V2V) & Vehicle-to-Infrastructure (V2I) communication with security which requires confidentiality, integrity, availability and authenticity to improve road safety and optimize road traffic. The technique used for secure communication in the presence of unauthorized parties (adversaries) is known as cryptography. Cryptography refers to encryption in which a plaintext message is converted into a ciphertext. Encryption can be done with private-key or public-key. In this paper, an algorithm based on private key encryption is used to make communication possible between two people with QualNet simulator. © 2012 Springer-Verlag.


Sikri G.,LLRIET | Rajni,SBSCET
Advances in Intelligent Systems and Computing | Year: 2012

Peak to Average Power Ratio (PAPR or PAR) is major problem of Orthogonal Frequency Division Multiplexing. The Classical Clipping method is used in this paper for reduction of PAPR using 4-PAM, 4-QAM and QPSK. Through the Analysis, it is shown that Clipping on 4-PAM is better than QPSK and 4-QAM with 64 subcarriers. © 2012 Springer-Verlag.


Singh B.,SBSCET | Kumar K.,SBSCET | Bhandari A.,Punjabi University
Proceedings of the 2015 International Conference on Green Computing and Internet of Things, ICGCIoT 2015 | Year: 2015

In this digital era, Internet has become the most widely used media of communication. Numerous critical services like e-commerce, social media, online banking are based on the Internet, so non-availability of Internet may lead of financial, social and legal implications. DDoS attacks are the most serious attack that hampers the availability of Internet. Their major aim is to deny the services of the legitimate users. The current solutions of DDoS defence are not able to handle these types of sophisticated attacks. Application Layer DDoS(AL-DDoS) attack in-turn makes this problem even more challenging. Because in AL-DDoS attacks, a genuine connection is established with the server by the legitimate clients that make it difficult to differentiate the attacker and the normal client. This paper aims to study the impact of the application layer DDoS attacks against web services using web cache model available in NS2 simulator. The attack is launched on the server requests handling capacity so that legitimate users wont get the required services. Various performance metrics like transaction throughput, legitimate transactions drop, server queue utilization by legitimate, successful HTTP transactions, Transaction survival ratio etc. are calculated to measure the impact of the attack. © 2015 IEEE.


Goyal T.,Punjab Technical University | Walia R.S.,University of Punjab | Sidhu T.S.,SBSCET
Materials and Manufacturing Processes | Year: 2012

In this article, Taguchi design of experiments L 18 orthogonal array have been adopted for making the electro-conductive coatings. Process parameters selected for this study are: substrate material, type of powder feeding arrangement, stagnation gas temperature, stagnation gas pressure, and standoff distance. The response parameter of cold spray coatings produced is measured in terms of coating thickness. The analyses of the raw data and Signal-to-Noise (S/N) ratio of the response parameters have been performed using analysis of variance (ANOVA). The optimum process parameters are predicted on the basis of analyses of the raw data and S/N ratio. The percentage contribution of the various process parameters with reference to coating thickness as response has been predicted. The significant process parameters in decreasing order of their contribution are: standoff distance, stagnation gas temperature, substrate material, stagnation pressure of the carrier gas, and feed arrangement of the powder particles. © 2012 Copyright Taylor and Francis Group, LLC.

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