Z-Source Inverter Based Motor Drives for Industrial Medium Voltage Application

This paper presents an application of z-source inverter for industrial medium voltage drives. Z-source inverter based drive has advantages like boosting the output voltage during voltage sag, reducing harmonic distortion and improving the input power factor. Adjustable speed drives (ASD’s) are interrupted due to voltage sag, reducing the manufacturing and financial losses. The medium voltage ac drives are limited to low value of switching frequency because of dynamic losses of the power devices. Using the proposed technique, it can remove those limitations. In this paper, the performance of traditional voltage source inverter is compared to that of z-source inverter for medium voltage drives under different operating conditions. Simulation results show the dynamic performance of z-source inverter based 225KW, 3.3KV induction motor drives during input supply fluctuation. The proposed closed loop control method provides nearly zero steady state speed error at any operating frequency

Bouncing cosmology from warped extra dimensional scenario

From the perspective of four dimensional effective theory on a two brane warped geometry model, we examine the possibility of "bouncing phenomena"on our visible brane. Our results reveal that the presence of warped extra dimension lead to a non-singular bounce on the brane scale factor and hence can remove the "big-bang singularity". We also examine the possible parametric regions for which this bouncing is possible.Comment: 7 pages, 3 figure

A New Blind DOA Estimation Using Two Uniform Linear Array for Low Side Lobe Adaptive Array

312-314Suitably designed Adaptive algorithm can collect the main signals’ multipath and add them constructively with main signal with very low side lobe level in all other directions, hence eliminating the jamming signal from other directions. A new technique for DOA estimation of signals impinging on Two Uniform Linear Array (ULA) offset with each other by a known angle also has been proposed for further analysis and discussions

Advance Intelligent Video Surveillance System (AIVSS): A Future Aspect

Over the last few decades, remarkable infrastructure growths have been noticed in security-related issues throughout the world. So, with increased demand for Security, Video-based Surveillance has become an important area for the research. An Intelligent Video Surveillance system basically censored the performance, happenings, or changing information usually in terms of human beings, vehicles or any other objects from a distance by means of some electronic equipment (usually digital camera). The scopes like prevention, detection, and intervention which have led to the development of real and consistent video surveillance systems are capable of intelligent video processing competencies. In broad terms, advanced video-based surveillance could be described as an intelligent video processing technique designed to assist security personnel’s by providing reliable real-time alerts and to support efficient video analysis for forensic investigations. This chapter deals with the various requirements for designing a robust and reliable video surveillance system. Also, it is discussed the different types of cameras required in different environmental conditions such as indoor and outdoor surveillance. Different modeling schemes are required for designing of efficient surveillance system under various illumination conditions

A New Blind DOA Estimation Using Two Uniform Linear Array for Low Side Lobe Adaptive Array

Suitably designed Adaptive algorithm can collect the main signals’ multipath and add them constructively with main signal with very low side lobe level in all other directions, hence eliminating the jamming signal from other directions. A new technique for DOA estimation of signals impinging on Two Uniform Linear Array (ULA) offset with each other by a known angle also has been proposed for further analysis and discussions

SYNTHESIS, CHARACTERIZATION AND EVALUATION OF ANTICANCER ACTIVITY OF SOME NEW SCHIFF BASES OF 1, 3, 4-THIADIAZOLE DERIVATIVES

Objective: N-benzylidene-5-phenyl-1, 3, 4-thiadiazol-2-amine derivatives: Synthesis and anticancer activity.Methods: In the present study five new derivatives of N-benzylidene-5-phenyl-1, 3, 4-thiadiazol-2-amine (Schiff bases containing 1, 3, 4-thiadiazole) were synthesized according to the literature methods and were characterized by FT-IR, 1H NMR spectroscopy and C, H, N analysis. Anticancer activity was evaluated in Male Swiss albino mice using Ehrlich's Ascites carcinoma cells. Compounds were administered at a dose of 25 mg/kg, body weight intraperitoneally.Results: The compounds were found to reduce tumor volume, viable cell count and increase the tumor weight (%) inhibition, ascites cells (%) inhibition, non-viable cell count and increase in life span (%ILS). All the compounds exhibited significant (P< 0.01) anticancer activity compared to control and the compound 2d & 4d was found to be most potent.Conclusion: It is concluded that synthesized Schiff bases of 2-amino-5-aryl-1, 3, 4-thiadiazoles derivatives are biologically active and developed into useful anticancer agents.Â

Modeling and reliability analysis of three phase z-source AC-AC converter

This paper presents the small signal modeling using the state space averaging technique and reliability analysis of a three-phase z-source ac-ac converter. By controlling the shoot-through duty ratio, it can operate in buck-boost mode and maintain desired output voltage during voltage sag and surge condition. It has faster dynamic response and higher efficiency as compared to the traditional voltage regulator. Small signal analysis derives different control transfer functions and this leads to design a suitable controller for a closed loop system during supply voltage variation. The closed loop system of the converter with a PID controller eliminates the transients in output voltage and provides steady state regulated output. The proposed model designed in the RT-LAB and executed in a field programming gate array (FPGA)-based real-time digital simulator at a fixedtime step of 10 μs and a constant switching frequency of 10 kHz. The simulator was developed using very high speed integrated circuit hardware description language (VHDL), making it versatile and moveable. Hardware-in-the-loop (HIL) simulation results are presented to justify the MATLAB simulation results during supply voltage variation of the three phase z-source ac-ac converter. The reliability analysis has been applied to the converter to find out the failure rate of its different components