Grewal J.S.,GNDEC |
Kaur S.,GNDU RC
Materials Today: Proceedings | Year: 2017
A textile mill provides one of the hardest and rigorous environments to a ring and a traveler of a spinning machine. Generation of high contact pressure between the ring and the traveler during winding led to degradation of the internal surface of the ring, thus its working life. This study elucidated towards enhancing the working life of the ring as well as decreasing the time required to reinstate the rings on the spindle periodically during spinning. The objective was carried out by comparing four different detonation gun (D-Gun) thermal sprayed coatings on bearing alloy steel (E52100) ring in a laboratory test using pin-on-disc apparatus. The microstructure and mechanical properties of the WC-Co-Cr, Cr3C2NiCr, Al2O3+TiO2 (Alumina-Titania) and Stellite-6 coatings were comparatively studied with those of uncoated E52100. The coated E52100 showed significantly less wear loss as compared to bare E52100. The investigations revealed that the cumulative volume loss for detonation sprayed coatings increased with increase in load. The WC-Co-Cr coating underwent minimum wear and the WC-Co-Cr-E52100 coating-substrate combination exhibited highest abrasive wear resistance. The results obtained during pin-on-disc laboratory test may be used for comparison of wear resistance of different coatings deposited on E52100 alloy steel rings in the textile mill. © 2017 Elsevier Ltd. All rights reserved.
Gupta A.,GNDU RC |
Malhotra J.,GNDU RC
International Journal of Future Generation Communication and Networking | Year: 2016
Orthogonal frequency division multiplexing (OFDM) can accomplish high use effectiveness. Various system impairments affect the performance of system. So mechanisms should be adopted to improve the performance of the system. In this paper, a 40 Gbps optical OFDM system is designed. Comparative analysis of the designed system is done using different fiber standards and dispersion compensating mechanisms on the basis of transmission distance and SNR. From the present research, it is clear that pre dispersion compensating mechanisms perform better than post ones. The fiber standards considered in present research are SMF, ALCATEL, ITU G.652, ITU G.654, and ITU G.655. Of all the fibers, ALCATEL (D=8 ps/nm/km) is able to cover maximum distance i.e. 660km with SNR 30.08 dB. For rest of fibers, the performance was remarkable for few hundreds of kilometres and then degraded. ITU G.655 (D=3.78ps/nm/km) gives the best SNR i.e. 32.08 dB upto 418km then degrades due to less DCF fiber length to compensate for dispersion. © 2016 SERSC.
Kaur S.,GNDU RC |
Malhotra J.,GNDU RC
International Journal of Future Generation Communication and Networking | Year: 2015
Wireless body area networks (WBAN) are expected to be a breakthrough technology in healthcare areas, telemedicine, and physical rehabilitation. The nature of the propagation of electromagnetic signals in complex shaped human body in the case of WBAN is expected to be very much different from that found in other environments, e.g. home, offices, streets, etc. So in order to design a high quality WBAN it is very important to examine and improve the propagation characteristics of channel models of WBAN. The aim of this paper is to provide an overview of different channel models of WBANs. The effect of channel behavior due to dynamics has been surveyed and challenges in channel modeling have been extracted. © 2015 SERSC.
Kaur A.,GNDU RC |
Singh H.,GNDU RC |
Malhotra J.,GNDU RC
Transactions on Electrical and Electronic Materials | Year: 2016
In this paper, two configurations (T-type and Y-type) of dual band Wilkinson Power Divider based upon Hilbert curves are presented. Formerly, the concept of Hilbert Curves was implemented in only designing microstrip antennas. In power dividers, this is the very first attempt of incorporating them for size reduction. In addition to this, an effect of inculcation of high-dielectric constant layer (Hafnium-oxide, HfO2, εr= 25) between a substrate and top metallization in both configurations was investigated. The proposed configurations are designed on a high resistive silicon substrate (HRS) for L and S bands with resonating frequencies of 1.575 and 3.4 GHz. Both configurations have return loss that is better than 20 dB and an insertion loss of around 6 dB; isolation better than 30 dB was achieved for both models. © 2016 KIEEME. All rights reserved.