Time filter

Source Type

Mali H.S.,Chitkara Institute of Engineering and Technology | Manna A.,Punjab Engineering College
International Journal of Advanced Manufacturing Technology | Year: 2010

Abrasive flow machining (AFM) is gaining widespread application finishing process on difficult to reach surfaces in aviation, automobile, and tooling industry. Al/SiCp-MMC is a promising material in these industries. Here, AFM has been used to finish conventionally machined cylindrical surface of Al/15 wt% SiCp-MMC workpiece. This paper presents the utilization of robust design-based Taguchi method for optimization of AFM parameters. The influences of AFM process parameters on surface finish and material removal have been analyzed. Taguchi experimental design concept, L18 (6 1∈×∈37) mixed orthogonal array is used to determine the S/N ratio and optimize the AFM process parameters. Analysis of variance and F test values also indicates the significant AFM parameters affecting the finishing performance. The mathematical models for R a, R t, ΔR a, and ΔR t and material removal are established to investigate the influence of AFM parameters. Conformation test results verify the effectiveness of these models and optimal parametric combination within the considered range. Scanning electron micrographs testifies the effectiveness of AFM process in fine finishing of Al/15 wt% SiCp-MMC. © 2010 Springer-Verlag London Limited. Source

Supriya Kinger Er.,Chitkara Institute of Engineering and Technology
Journal of Emerging Technologies in Web Intelligence | Year: 2010

Visual cryptography scheme (VCS) is a secretsharing scheme which allows the encryption of a secret image into n shares that are distributed to n participants. The beauty of such a scheme is that, the decryption of the secret image requires neither the knowledge of cryptography nor complex computation. Colour visual cryptography becomes an interesting research topic after the formal introduction of visual cryptography by Naor and Shamir in 1995. It is a powerful technique which combines the notions of perfect ciphers and secret sharing in cryptography with that of raster graphics. A binary image can be divided into shares which can be stacked together to approximately recover the original image. Unfortunately, it has not been used much primarily because the decryption process entails a severe degradation in image quality in terms of loss of resolution and contrast. Its usage is also hampered by the lack of proper techniques for handling grayscale and color images. In this paper, I have developed a novel technique which enables visual cryptography of color as well as grayscale images. The physical transparency stacking type of decryption allows for the recovery of the traditional visual cryptography quality image. An enhanced stacking technique allows for the decryption into a halftone quality image. And finally, a computation based decryption scheme makes the perfect recovery of the original image possible. Based on this basic scheme, I have then established a progressive mechanism to share color images at multiple resolutions. I extracted shares from each resolution layer to construct a hierarchical structure; the images of different resolutions can then be restored by stacking the different shared images together. I have implemented our technique and present results. © 2010 ACADEMY PUBLISHER. Source

Chandra Boro R.,Chandigarh Institute of Microbial Technology | Kaushal J.,Chitkara Institute of Engineering and Technology | Nangia Y.,Chandigarh Institute of Microbial Technology | Wangoo N.,Chandigarh Institute of Microbial Technology | And 2 more authors.
Analyst | Year: 2011

We present a novel immunoassay format utilizing the catalytic properties of gold nanoparticles in the luminol-silver nitrate-gold nanoparticle based chemiluminescence (CL) system for the detection of widely used herbicide 2,4-dichlorophenoxyacetic acid (2,4-D). Highly sensitive anti-2,4-D antibody was produced and conjugated with gold nanoparticles of various sizes. In the present assay format, employing a competitive inhibition approach, a well-characterized hapten-protein conjugate (2,4-D-BSA) was used to coat the microtiter plates. The analyte (2,4-D) was pre-incubated with anti-2,4-D antibody labeled with gold nanoparticles and added to each well of the microtiter plate. The gold label triggered the reaction between luminol and silver nitrate generating a luminescence signal at 425 nm. Under the optimized conditions, the CL based immunoassay showed the detection limit of 2,4-D in standard water samples around 3 ng mL -1. The CL based immunoassay format, based on gold nanoparticles as a catalyst, could be used as a fast screening methodology (<30 min) for pesticide detection. © 2011 The Royal Society of Chemistry. Source

Gupta D.P.,Chitkara Institute of Engineering and Technology | Kumar S.,Kurukshetra University | Kalsi P.C.,Bhabha Atomic Research Center | Manchanda V.K.,Bhabha Atomic Research Center | Mittal V.K.,Punjabi University
Radiation Effects and Defects in Solids | Year: 2012

Polyvinyl chloride (PVC) films are subjected to high doses of γ-radiation up to 800kGy. The modifications in the optical properties, the structural and chemical changes are investigated by recording the ultraviolet-visible (UV-VIS) and the Fourier transform infrared (FTIR) spectra of unirradiated and irradiated PVC films. The UV-VIS data show an increase in absorbance and shift of the absorption edge towards the visible region from the UV region with the increase in the γ-radiation dose. This may be attributed to the formation of conjugated system of bonds. The direct and the indirect optical energy band gaps are determined as a function of the γ-exposure dose. The results show that both the direct and the indirect energies of transitions decrease with the increasing γ-absorbed dose. Also the direct energy band gap has higher values when compared with the corresponding values of the indirect energy band gap. The intensity of the different infrared bands in the FTIR spectra of irradiated PVC indicates the presence of the hydroxyl group, release of volatile gases and polyene formation. A total destruction of the structure is observed at a very high γ-radiation dose. © 2012 Copyright Taylor and Francis Group, LLC. Source

Kaur J.,Chitkara Institute of Engineering and Technology | Kehar N.,Government Arts and Sports College
Proceedings of the International Conference on Advances in Computing and Artificial Intelligence, ACAI 2011 | Year: 2011

Radio Frequency Identification (RFID) is an emerging technology to enhance the Bar- code technology. This technology enables the electronic and wireless labelling and identification of objects, humans and animals. The technology can be used for many powerful applications including automatic item tracking, smart home appliances etc. The key idea is to attach each and every item with an RFID tag which can be read by RFID readers via radio communication. RFID technology uses wireless communication in radio frequency bands to transmit data from tags to readers. A reader scans the tag for data and sends the information to a database, which stores the data contained on the tag. RFID networks are getting deployed at a rapid pace and have already entered the public space on a massive scale: public transport cards, the biometric passport, office ID tokens, customer loyalty cards, etc. Although RFID technology offers interesting services to customers and retailers, it could also endanger the privacy of the end-users. The lack of protection mechanisms being deployed could potentially result in a privacy leakage of personal data. It is not a new technology and has been in the public domain for at least 10 years. © 2011 ACM. Source

Discover hidden collaborations