International Journal of Scientific Research and Technology aims at publishing the finest peer-reviewed reserch in all fields of science and technology on the basis of its originality,importance,interdisciplinary interest,timelines, accessability and elegance. The Journal intends to serve for the advancement and dissemination of knowledge in all fields of Science & Technology.

International Journal

  1. Modeling Simulation and Harmonic Analysis of a Ser
  2. Series Resonant Inverter (SRI) is a source of very high frequency energy and is used for high frequency applications, such as Induction heating, Metal and thin film plastic surface treatment, communication and AC power flow areas (HVDC and HVAC) etc. SRIs are linked with the load through high frequency transformers to improve the current gain. Inclusion of transformers and RL load leads to higher frequency harmonic components in the load voltage. The present papers includes the harmonic analysis of a basic SRIs (Class – A), feeding RL load with the consideration of transformer parameters. System is modeled first in continuous time domain and then harmonic analysis is carried out using MATLAB/SIMULINK which is extended to the filtering out the higher frequency harmonic components using Butterworth IIR filter.
  4. : In this work the rainfall in Marathawada is studied, and possible source of rainfall erraticism is analyzed. Based on the historical data, prediction of rain in the year 2015 is made. Since the rain amount varies widely from year to year, it would be advisable for the farmers to have an alternative for irrigation or have alternate sources of income. Since the prediction is being made well in advance on December 2, 2014 i.e. the date of completion of the manuscript, , it gives sufficient time to farmers to select future course of action if the technique demonstrated here is followed subsequently.
  5. Implementation of Fast Fourier Transform using Ver
  6. The Discrete Fourier Transform (DFT) can be implemented very fast using Fast Fourier Transform (FFT). It is one of the finest operations in the area of digital signal and image processing. FFT is a luxurious operation in terms of MAC. To achieve FFT calculation with a many points and with maximum number of samples the MACs requirement could not be matched by efficient hardware’s like DSP. So a fine solution is to use dedicated hardware processor to perform efficient FFT working out at high sample rate, while the DSP could perform the less concentrated parts of the processing. Verilog implementation of floating point FFT with reduced generation logic is the proposed architecture, where the two inputs and two outputs of any butterfly can be exchanged hence all data and addresses in FFT dispensation can be reordered.
  8. Concrete is an inherently porous material. Pores have been classified in terms of pore size distribution parameters. Mean radius or equivalent radius has also been used in the assessment of porous material like concrete and it has been related to other parameters like water-cement ratio, degree of hydration, age etc. Different methods are used to estimate such a radius and overall radii distribution, Mercury Intrusion Porosimetry being the most common. The method has yielded appreciable results within its limitations and they have been extensively studied. But it is quite cumbersome to carry out and becomes increasingly costly for higher pressure applications. Other methods like water retention curves and imaging of individual pores require a lot of effort to generate statistically significant results. This paper presents the result of an effort to carry out pore radius estimation in essentially cement paste samples using the phenomenon of capillary absorption of water. Capillarity in porous materials is governed by the Lucas-Washburn equation to an appreciable extent. Five water-cement ratios(0.2,0.3,0.4,0.5,0.6) and five curing ages(1,3,7,28,90 days) have been used to widen the scope and observe the trends. Results have been compared with the MIP results from an earlier study in the same laboratory. The magnitude found for the effective pore sizes through Lucas Washburn Equation are two to three orders smaller than the corresponding mean pore radius as obtained in MIP studies. But the comparison trends between w/c ratios and curing ages are seen to be largely similar. It is believed that this parameter might be used for the purpose of comparative evaluation of materials based on actual rates of absorption.
  10. We determine the intrinsic shapes of the light distribution of elliptical galaxies NGC 5638 and NGC 5813 by combining the profiles of photometric data from the literature with triaxial models. We use ensembles of models so that the shape estimates are largely model independent. We follow the methodology as described in Statler (1994) which is modified to suit our requirements. We find that short to long axial ratios at very small radii and at very large radii, and the absolute value of the triaxiality difference are the best constrained shape parameters. We use a modified prior as obtained from the shape estimates of a large sample of elliptical galaxies to determine the intrinsic shapes of the elliptical galaxies NGC 5638 and NGC 5813. Shape estimates using modified prior should be more reliable. These results are compared with the previous estimates which are determined by using flat prior reported by Chakraborty et al (2008) and Singh and Chakraborty (2009). The plot shows the intrinsic shapes of the NGC 5638 and NGC 5813 as a function of (q0,q∞) for two dimensional shapes and (q0,q∞,|Td|) for three dimensional shapes, where q0 and q∞(=q) are the short to long axial ratios at small and at large radii and |Td| is the absolute values of the triaxiality difference, defined as |Td|= |T∞ - T0|. The probability is shown in the dark grey region: darker is the region higher is the probability. We find that both the galaxies NGC 5638 and NGC 5813 are rounder inside and flatter outside.
  11. Structural and Optical Properties of Multilayered
  12. Li Doped multilayer ZnO thin films were deposited using sol-gel spin coating technique. Structural properties of films using XRD showed as the number of layers of the coating increases the crystallite size increases with maximum value > 50nm. Microstrain of films showed lower values for thicker films. Envelop method is used to determine optical properties of film using transmission spectra. Urban energy values of the films were calculated.
  13. Detection of Distributed denial of service using h
  14. Honeypots is a resource which pretends to be a real target, so that we can protect the real resource or service from the malicious users/hackers and know their intentions and attack patterns. In this paper, we present a security solution whereby we deploy three fake services on three ports on the server. These act as bait to the hacker and whenever one tries to access, we close the connection and know the IP address and the ports from which it is establishing the connection, and store it in a database. On a large number of connection attempts on these fake services, the IP addresses are deemed as malicious users and they are denied connection on the main service and their report is given to the admin, so that we can manually block or unblock the IP addresses and can identify the location and take requisite action.
  15. Estimation of Ground Water Reserves Without Drilli
  16. In this work, estimate of water reserves without drilling operations are carried out. The method used is using field voltage measurements and three dimensional finite element analysis and optimization calculations. . The method is explained by considering three cases where unknowns solved are ( a) voltage distribution due to applied voltage in the current carrying poles , (b ) conductivities of various layers , and ( c ) conductivities and depth of layers given the voltages measured at different points on the ground.
  17. Realization of RF Transceiver for Wireless sensor
  18. This paper presents the system level design and simulation of a 1-Mb/s 2.4 GHz transceiver. The RF transmitter consists of a QPSK modulator, an up conversion mixer, a power amplifier and a 2.4 GHz Band pass filter. At the receiver RF front end, the low noise amplifier with down conversion to zero-IF, a low pass filter and a QPSK demodulator is used. This design is focused on the determination of optimum performance of 2.4GHz wireless transceiver where the expected results would be achieved as two independent phase signals represented as I signal and Q signal. These two independent signals are generated by the help of a signal generator to be processed in transmitter and receiver. The various block parameters of the transmit/receive RF front end like noise figure, gain , 1dB compression point and IIP3 are simulated and optimized to meet the low power and low cost transceiver specifications.
  20. : The goal of this paper is to wireless control of induction motor using PLC .The PLC is the emerging technology in the electrical and electronics world because the it have the various component such as memory input and output system, this function allows a PLC to read the status of its input terminals and energize or de-energize its output terminals. This paper investigates the communication between PLC and PC through wireless connection for controlling the speed of induction motor. In wired network system the communication between PLC and motor, I get the RPM of induction motor through manually using tachometer and manually change the speed reference through VFD. So I get the approx straight line output between speed reference and manually RPM. But in case of wireless system the connection between PLC and PC is very interesting and useful for future work. In this method the speed reference input is given in PC through a RS logix 5000 software and is running in both mode forward and reverse direction manually. The VFD is much important role play for record the data of voltages, currents, RPM, (in forward or reverse mode) also DC bus voltage etc, in loading or without loading in motor respectively. So the output waveform between speed reference and RPM in wireless system is also a straight line when we record the RPM using tachometer but in PLC the indicated reading is recorded with slip. So in this paper I got a conclusion between speed reference and RPM with both connections wired or wireless the changing of output waveform is not vary. So the wireless system is very useful for large and future scope.
  21. Design and Analysis of Minkowski Square Loop Fract
  22. With the rapid evolution in wireless communication systems and increasing importance next generation wireless applications, wideband and low profile antennas are in great demand for both commercial and military applications. Applying fractals to antenna elements allows for smaller, resonant antennas that are multiband/broadband and may be optimized for gain. In this paper, Minkowski fractal antenna for Bluetooth application has been designed. Apart from this, it can be used for various other applications as well because of its multiband feature. The antenna is fed by Microstrip feeding technique. The proposed patch antenna is designed and simulated on IE3D simulation software and it is designed to operate in 2.45GHz band. In this analysis, we have compared the antenna parameters such as gain, impedance, antenna efficiency, radiation efficiency, radiation pattern, polar plots, VSWR and Q-factor. Reduction in patch antenna size is achieved when performing fractalization of the main patch.
  23. Quality of Service (QoS) for improvement of Channe
  24. The wireless mesh network is an emerging technology for the next generation wireless Internet. It works as a backhaul for other wireless network. There are number of issues which need to be considering in wireless mesh network. As in other networks like MANET, ADHOC, SENSOR power is the major constrained. But it is not so in WMN. So, Power can be optimally utilised. It can be used to increase throughput and channel utilization of the network so that to improve QoS. Here we will discuss some major issues which need to be considered in WMN. Wireless mesh network operates similar as the network of fixed routers only difference is that they are connected with the wireless links. This paper gives the brief overview of the issues exist in WMN and the existing channel assignment schemes in multicast WMN.
  26. In this paper, automated method of manufacturing in remote and rural areas are discussed. These areas many times lack supply of electrical energy. This is overcome by introducing efficient method of solar energy conversion into electricity using photo- voltaic solar panels. Next, to introduce better productivity and quality control, x-y robots are used which use micro-processor control. The end-effector of this robot carries an embroidery frame which is given motion in two dimensions. The two-dimensional motion is co-ordinated with sewing machine needle’s motion.
  27. Microscopic Study of Different Compositions of Bra
  28. Brass is one of the most important domestic, industrial and ornamental alloys of Cu and Zn. Different compositions of brass ranging from Cu wt% 60 to 80 are used wide over. In present study, brass in four compositions has been prepared by sand casting and optical micrography has been done to compare the effect of composition on microstructure. The superheat temperature has also been varied in two steps viz. 980 oC and 1100oC and the effect on microstructure has been reported.
  29. Short Time Fourier Transform based Dominant Freque
  30. In this paper authors propose a novel method of dominant frequency detection, based on the short time Fourier transforms (STFT), to quantify and visualize the information as feature contains in the specific frequency bands defined in the analysis of electroencephalogram (EEG) signal for brain computer interface (BCI). The raw EEG subjected to band pass filter. The filtered signal subjected to the proposed algorithm for calculating the variance of relative power spectral intensity. The dominant frequency components are easily identified by analyzing the variance of relative power spectral intensity using proposed method. The effectiveness of proposed method of EEG signal processing is validated by self-generated artificial sine wave signal, Steady State Visual Evoked Potential (SSVEP) data set and single subject Movement Imagery (MI) BCI competition data set.