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Search Results: 1 - 10 of 1176 matches for " Satya Narayana Padhi "
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High Efficiency SiC Terahertz Source in Mixed Tunnelling Avalanche Transit Time Mode  [PDF]
Pranati Panda, Satya Narayana Padhi, Gana Nath Dash
World Journal of Nano Science and Engineering (WJNSE) , 2014, DOI: 10.4236/wjnse.2014.44018
Abstract: High frequency properties of 4H-SiC double drift region (DDR) Mixed Tunnelling Avalanche Transit Time (MITATT) diodes are studied through computer simulation method. It is interesting to observe that the efficiency of SiC (flat) DDR MITATT diode (16%) is more than 4 times that of Si (flat) DDR MITATT diode (3.59%). In addition, a power output of more than 15 times from the SiC MITATT diode compared to the Si MITATT diode is commendable. A reduced noise measure of 17.71 dB from a low-high-low (lo-hi-lo) structure compared to that of 21.5 dB from a flat structure of SiC is indicative of the favourable effect of tunnelling current on the MITATT diode performance.
Nimushakavi Satya narayana Murthy sharma
International Journal of Advances in Engineering Sciences , 2011,
Abstract: This paper presents the Novel design of 8-TAP FIR digital filters. Processing of a signal in digitized form is better than in its analog form ,the folding transformation is used to systematically determine the control circuits in DSP architectures where multiple algorithm operations are time multiplexed to a single functional unit. By executing multiple algorithm operations on a single functional unit, the number of functional units in the implementation is reduced, resulting in a integrated circuit with low silicon area. The FIR filter is fabricated using SMIC 0.13um CMOS technology, and operates at 1.3GHz under the condition of 1.2Vsupply voltage. Area savings are achieved even when conversion overhead is taken into consideration, and the FIR filter requires 26.8% smaller area in the same condition.
Review on Fragment Allocation by using Clustering Technique in Distributed Database System
Priyanka Dash,Ranjita Rout,Satya Bhusan Pratihari,Sanjay Kumar Padhi
Computer Science , 2013,
Abstract: Considerable Progress has been made in the last few years in improving the performance of the distributed database systems. The development of Fragment allocation models in Distributed database is becoming difficult due to the complexity of huge number of sites and their communication considerations. Under such conditions, simulation of clustering and data allocation is adequate tools for understanding and evaluating the performance of data allocation in Distributed databases. Clustering sites and fragment allocation are key challenges in Distributed database performance, and are considered to be efficient methods that have a major role in reducing transferred and accessed data during the execution of applications. In this paper a review on Fragment allocation by using Clustering technique is given in Distributed Database System.
Identification of Faults in HVDC System using Wavelet Analysis
Satya Narayana,Bonigala Ramesh,Saheb Hussain
International Journal of Electrical and Computer Engineering , 2012, DOI: 10.11591/ijece.v2i2.179
Abstract: In present days high voltage direct current (HVDC) Transmission is most essential for bulk power transfer and large scale demands. Due to heavy power demand, maintenance of power quality has become very difficult. Most common disturbances are faults on the system which can be classified as symmetrical and non-symmetrical faults. The other disturbance like internal faults in converter and equipments also produce same effect. Some are very severe while some have less impact. Hence the identification and classification of faults is important for safe and optimal operation of power systems. For secure operation of a system a feasible approach is to monitor signals so that accurate and rapid classification of fault is possible for making correct protection control.To identify HVDC faults by using pure frequency or pure time domain based method is difficult. The pure frequency domain based methods are not suitable for time varying transients and the pure time domain based methods are very easily influenced by noise.Wavelet analysis is one of the methods used for providing discriminative features with small dimensions to classify different disturbances in HVDC transmission system. This paper explores the application of wavelet based Multi-Resolution Analysis (MRA) for signal decomposition to monitor some faults in HVDC system. The faults in HVDC system can be classified by monitoring the signals both on AC and DC sides of the HVDC system. The fault classifier can be developed from these monitored signals which show promising features to classify different disturbances in the HVDC system. The simulations are carried out in MATLAB as computational engine. The results show that wavelet technique leads to a new way for fault detection and protection in HVDC system.
Influence of Variable Permeability and Radiation Absorption on Heat and Mass Transfer in MHD Micropolar Flow over a Vertical Moving Porous Plate
D. Harish Babu,P. V. Satya Narayana
ISRN Thermodynamics , 2013, DOI: 10.1155/2013/953536
Air Object Height Estimation with 2-D Radars using Fuzzy Logic
SGK Murthy,MV Ramana Murthy,D Satya Narayana
Lecture Notes in Engineering and Computer Science , 2011,
P.V. Satya Narayana,G. Ramireddy,S. Venkataramana
International Journal of Automotive and Mechanical Engineering , 2011,
Abstract: Heat and mass transfer along a vertical porous plate under the combined buoyancy force effects of thermal and species diffusion is investigated in the presence of a transversely applied uniform magnetic field and the Hall currents are taken into account. The governing fundamental equations on the assumption of a small magnetic Reynolds number are approximated by a system of non-linear ordinary differential equations, which are integrated by fourth-order Runge–Kutta method. Velocity, temperature and concentration are shown on graphs. The numerical values of the local shear stress, the local Nusselt number Nu and the local Sherwood number Sh are entered in tables. The effects of the magnetic parameter, Hall parameter and the relative buoyancy force effect between species and thermal diffusion on the velocity, temperature and concentration are discussed. The results are compared with those known from the literature.
Room temperature soft ferromagnetism in the nanocrystalline form of YCo2 - a well-known bulk Pauli paramagnet
S. Narayana Jammalamadaka,E. V. Sampathkumaran,V. Satya Narayana Murthy,G. Markandeyulu
Physics , 2008, DOI: 10.1063/1.2929380
Abstract: The Laves phase compound, YCo2, is a well-known exchange-enahnced Pauli paramagnet. We report here that, in the nanocrystalline form, this compound interestingly is an itinerant ferromagnet at room temperature with a low coercive-field. The magnitude of the saturation moment (about 1 Bohr-magneton per formula unit) is large enough to infer that the ferromagnetism is not a surface phenomenon in these nanocrystallites. Since these ferromagnetic nanocrystallines are easy to synthesize with a stable form in air, one can explore applications, particularly where hysteresis is a disadvantage.
Implementation of SOBEL Edge Detection on FPGA
G. Anusha, Dr.T. JayaChandra Prasad, Dr.D. Satya Narayana
International Journal of Computer Trends and Technology , 2012,
Abstract: The image processing algorithms has been limited to software implementation which is slower due to the limited processor speed. So a dedicated processor for edge detection is required which was not possible until advancements in VLSI technology. The proposed work presents FPGA based architecture for Edge Detection using Sobel operator. Sobel operator is chosen due to its property of less deterioration in high levels of noise.
Asymptotic behaviour of solutions to $n$-order functional differential equations
Seshadev Padhi
Electronic Journal of Differential Equations , 2005,
Abstract: We establish conditions for the linear differential equation $$ y^{(n)}(t)+p(t)y(g(t))=0 $$ to have property A. Explicit sufficient conditions for the oscillation of the the equation is obtained while dealing with the property A of the equations. A comparison theorem is obtained for the oscillation of the equation with the oscillation of a third order ordinary differential equation.
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