National Institute of Technology Srinagar

www.nitsri.net
Srinagar, India

The National Institute of Technology, Srinagar is a national engineering institute located in Hazratbal, Srinagar, Jammu and Kashmir, India and an engineering institute of Northern India, along with other NITs and IITs of India. It is one of the 30 NITs in India, and as such is directly under the control of the Ministry of Human Resource Development . It is the 7th in the chain of 17 NITs established as a part of the Second Five Year Plan by the Government of India. Refer History of RECs for more information on the Regional Engineering College established during the 2nd five year plan . The institute has recognition as an Institute of National Importance under NIT act of Parliament and has produced more than 8000 graduates. Wikipedia.

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Dar M.A.,National Institute of Technology Srinagar
Proceedings - 2016 IEEE International Conference on Technological Innovations in ICT for Agriculture and Rural Development, TIAR 2016 | Year: 2016

Smart phones are changing the lives of millions of users worldwide because of their innovative, often free apps pertaining to different fields of life. As they are cheap and have almost all the functionalities of a desktop Pc, they can be used for the development of rural India. The success of the projects like e-Governance and digital India are possible with the help of theses smart phones as it can be afforded by the common citizen of India. Smart phones are making inroads in people's lives for one major reason-The astonishing growth in cheap, often free, software applications, or apps as they have come to be known. A Smartphone is almost like having a small computer right in the palm of your hand. It provides access to information and opportunities for collaboration. Activities that work well on smart phones are often audiovisual, things that incorporate pictures and video. As more applications become available, the more useful smart phones will become. A Smartphone can be a productivity tool in almost every field of life potentially to Kashmir valley where underdevelopment and unfavorable conditions are unavoidable. This paper identifies how mobile technology is poised to revolutionize business opportunities, deploy efficient healthcare, imparting employment oriented education, efficient deployment of resources and manpower even in the unfavorable conditions in Kashmir Valley. Technologies like Android, Aakash Tablets which drastically changed the mechanism of teaching, manner in which students are using them and are used in cost-effective and efficient manner in Kashmir Valley, are also discussed in this paper. © 2016 IEEE.


Khurshid B.,National Institute of Technology Srinagar
Journal of Circuits, Systems and Computers | Year: 2017

Generalized parallel counters (GPCs) are frequently used to construct high speed compressor trees on field programmable gate arrays (FPGAs). The introduction of fast carry-chain in FPGAs has greatly improved the performance of these elements. Evidently, a large number of GPCs have been proposed in literature that use a combination of look-up tables (LUTs) and carry-chains. In this paper, we take an alternate approach and try to eliminate the carry-chain from the GPC structure. We present a heuristic that aims at synthesizing GPCs on FPGAS using only the general LUT fabric. The resultant GPCs are then easily pipelined by placing registers at the output node of each LUT. We have used our heuristic on various GPCs reported in prior work. Our heuristic successfully eliminates the carry-chain from the GPC structure with an increase in LUT count in some GPCs. Experimentation using Xilinx FPGAs shows that filter systems constructed using our GPCs show an improvement in speed and power performance and a comparable area performance. © 2018 World Scientific Publishing Company


Khurshid B.,National Institute of Technology Srinagar
Electronics | Year: 2017

Generalized Parallel Counters (GPCs) are frequently used in constructing high speed compressor trees. Previous work has focused on achieving efficient mapping of GPCs on FPGAs by using a combination of general Look-up table (LUT) fabric and specialized fast carry chains. The resulting structures are purely combinational and cannot be efficiently pipelined to achieve the potential FPGA performance. In this paper, we take an alternate approach and try to eliminate the fast carry chain from the GPC structure. We present a heuristic that maps GPCs on FPGAS using only general LUT fabric. The resultant GPCs are then easily re-timed by placing registers at the fan-out nodes of each LUT. We have used our heuristic on various GPCs reported in prior work. Our heuristic successfully eliminates the carry chain from the GPC structure with the same LUT count in most of the cases. Experimental results using Xilinx Kintex-7 FPGAs show a considerable reduction in critical path and dynamic power dissipation with same area utilization in most of the cases.


Harmain G.A.,National Institute of Technology Srinagar
Theoretical and Applied Fracture Mechanics | Year: 2010

Many engineering components are subjected to variable amplitude loading history. It is well known that retardation in fatigue crack growth occurs due to application of single overloads in a constant amplitude loading block. Many models have been proposed to capture this counter intuitive phenomenon which has resulted in improved understanding of retardation effect following tensile overloads and consequently resulting in better life prediction models. The proposed study is focused on to evaluation of retardation in fatigue life due to application of a single overload. A model for prediction of crack growth and crack growth rate following single overloads is presented. Several modifications to Wheeler's growth idea are proposed, which incorporate a consideration for effective stress intensity factor, based on Elber's concept of crack closure, relationship between overload ratio and the Wheeler's exponent, and fatigue growth rate calculations. The results presented here show that plastic zone interaction following overload and the consideration of crack closure explain retardation effect following a single overload. Correlation between analysis and experimental data obtained from several sources in literature show that the scheme, is robust and provides an insight into the nonlinear aspect of crack growth results. The model has been tested for 2024-T3 aluminum alloy and 6061-T6 aluminum alloy and thorough calibrations performed, established the fidelity of the program. © 2009 Elsevier Ltd. All rights reserved.


Wani M.F.,National Institute of Technology Srinagar
International Journal of Applied Ceramic Technology | Year: 2010

The mechanical and tribological properties of a nano-Si3N 4/nano-BN composite were studied. The composite was prepared via high-energy mechanical milling and subsequent spark plasma sintering. Y 2O3 and Al2O3 were used as sintering additives. After sintering, the average crystalline size of Si 3N4 and BN was 50 nm. Hardness (Vicker and Knoop) was evaluated under a high load of 0.05-2.0 kg for the nano/nano- and the micro/micro-Si3N4/BN composite with the same composition. The indentation fracture toughness values of both composites were also evaluated. Tribological studies were conducted to study the friction and wear behavior of both composites. A friction coefficient of 0.4-0.7 was obtained for the nano-S3N4/nano-BN composite under a normal load of 20-22 N, whereas, a friction coefficient of 0.37 was obtained for the micro-Si3N4/micro-BN composite. Specific wear coefficients of 0.418 × 10-4 and 0.625 × 10-4 mm 3/N/m were obtained for nano-sized and micro-sized Si 3N4/BN composites, respectively. Higher hardness, higher fracture toughness, and lower wear were observed in the nano-sized composite, as compared with the micro-sized composite. © 2009 The American Ceramic Society.


Nissar A.,National Institute of Technology Srinagar | Mir A.H.,National Institute of Technology Srinagar
Digital Signal Processing: A Review Journal | Year: 2010

Steganography is the art of secret communication and steganalysis is the art of detecting the hidden messages embedded in digital media using steganography. Both steganography and steganalysis have received a great deal of attention from law enforcement and the media. In the past years many powerful and robust methods of steganography and steganalysis have been reported in the literature. In this paper, we classify and give an account of the various approaches that have been proposed for steganalysis. Some promising methods for statistical steganalysis have also been identified. © 2010 Elsevier Inc. All rights reserved.


Bhat A.H.,National Institute of Technology Srinagar | Langer N.,National Institute of Technology Srinagar
IEEE Transactions on Power Electronics | Year: 2014

This paper presents a control strategy using optimized switching sequences which results in capacitor voltage balancing of a three-phase neutral-point-clamped rectifier. In front end rectifiers, magnitude and lag angle of reference current vector (w.r.t supply voltage vector) varies depending upon amount of reactive power compensation and load current. Accordingly, the effectiveness of small and medium vectors (using SVPWM) for same switching state varies in each sector and its regions. This observation along with detailed analysis of current pattern for both the capacitors and their effect on neutral point voltage forms the basis of the proposed approach, which is to modify the reference vector for changing the number of sampling periods within each sector and its regions. The rectifier exhibits excellent performance in terms of other critical parameters like unity input power factor, low input current THD, minimum possible switching losses, reduced-rippled, and well-regulated dc-bus voltage, particularly, the capacitor voltage balancing. The proposed control algorithm is tested through exhaustive simulations and validated through experimental results obtained from a laboratory prototype of the rectifier. © 1986-2012 IEEE.


Najar M.H.,National Institute of Technology Srinagar | Majid K.,National Institute of Technology Srinagar
Journal of Materials Science: Materials in Electronics | Year: 2013

Materials having high thermal stability and electrical conductivity form potential candidates for electronics. In this study, a thermally stable nanocomposite of nanophotoadduct of pentaamminechlorocobalt(III) chloride with hexamine and polythiophene (PTh) was prepared by oxidative chemical polymerization in the presence of FeCl3 as oxidant and thiophene monomer. Photoadduct was obtained by photoirradiation followed by substitution with hexamine ligand which was then milled in G5 planetary ball mill to obtain nanophotoadduct which is confirmed by X-ray powder diffraction. The formation of nanophotoadduct and its incorporation in PTh structure was endorsed by fourier transform infrared analysis. Empirical formula of the nanophotoadduct was found to be [Co(NH3)2(OH)3C6H 12N4]·2H2O. SEM analysis revealed uniform distribution of nanophotoadduct in PTh matrix. Crystallite size and strain analysis revealed further decrease in size from 34 (nanophotoadduct) to 15 nm (nanocomposite) using different methods of analysis which were well correlated. This size reduction was attributed to the microstrain in the nanocomposite. TG revealed that the nanocomposite and PTh underwent 62 and 80 % weight loss at 1,000 C respectively which clearly indicated the higher thermal stability of nanocomposite compared to pure PTh. Little change in the glass transition temperatures of PTh (170 C) and nanocomposite (167 C) is observed from DSC which indicated smaller plasticizing effect of nanophotoadduct. I-V curves of nanophotoadduct showed its diode like behavior while as nanocomposite depict nearly ohmic behavior. These results illustrate that the nanophotoadduct play two important roles, one that it acts as a Schottky diode material and second that it increases the conductance and thermal stability of PTh. Nanocomposite thus obtained can operate at relatively high temperatures in electrical appliances. © 2013 Springer Science+Business Media New York.


Khan G.R.,National Institute of Technology Srinagar
Optical Fiber Technology | Year: 2012

Analytical solutions to rate and propagation equations describing gain in terms of photon intensities, transition rates, and absorption and emission cross-sections is determined in radially symmetric and longitudinally uniform monomode erbium doped silica fiber in presence of pump excited-state absorption effect for a pumping wavelength of 514.5 nm under the steady-state conditions with the help of a homogenous four-band transition scheme. © 2012 Elsevier Inc. All rights reserved.


Bhat A.H.,National Institute of Technology Srinagar | Langer N.,National Institute of Technology Srinagar
International Journal of Electrical Power and Energy Systems | Year: 2014

In this paper, an improved performance three-phase neutral-point clamped bidirectional rectifier with modified control scheme is proposed. The proposed control strategy takes into consideration the amount/degree of deviation of source voltage from desired rated value during supply perturbation and accordingly modifies the reference current template for each phase individually which is termed as compensated reference current. In other words, magnitude, shape and phase of compensated reference current waveform for each phase are different depending on amount of deviation of that phase. A complete mathematical model of rectifier using PWM technique is developed. The performance of the converter is evaluated in terms of near unity input power factor, low input current THD, reduced ripple factor of the regulated DC output voltage and particularly the neutral point voltage balance under different load conditions both for rectification and inversion modes of operation. It is shown that the three-level ac to dc converter with proposed control scheme displays better performance under source voltage perturbations such as voltage sag, swell, unbalance, harmonics, frequency variations as well as phase angle deviations which are regularly encountered in practical environment. © 2013 Elsevier Ltd. All rights reserved.

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