Informatics Publishing Limited

A. Ramesh Babu ¹

Affiliations
1 Department of Electrical and Electronics Engineering, Sathyabama University, Chennai, IN

Abstract

This paper presents the optimized harmonic elimination stepped waveform technique to improve the output waveform of 7-level Cascaded Multilevel Inverter (CMLI) fed induction motor. The CMLI with separate DC source is used generate a 7-level output with three H-bridge and 12 switch's. The working of 7-level CMLI is analyzed by phase disposition and phase shifting pulse width modulation with bipolar and unipolar modes of operation. The performance of CMLI is examined by various parameters such as THD, power factor, motor current, motor speed and torque. The presented result carried out using MATLAB/simulink. The simulation result for phase disposition and phase shift carrier PWM were compared. The 7-level CMLI hardware with phase shift carrier modulation was developed to validate simulation result.

Keywords

CMLI, Phase Disposition, Phase Shift Carrier, Single Phase Asynchronous Induction Motor, THD, Unipolar And Bipolar.

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M. Surendra ¹, T. Venkateswara Rao ², K. Lokeswara Reddy ², A. Ramesh Babu ²

Affiliations
1 Department of Pharmaceutics, Bapatla College of Pharmacy, Bapatla, Guntur (D.t), Andhra Pradesh-522101, IN
2 Department of Pharmaceutics, Bapatla College of Pharmacy, Bapatla, Guntur (D.t), Andhra Pradesh-522101, IN

Abstract

Microencapsulation by Ionic gelation technique is an approach to achieve controlled release of drug and mucoadhesive microcapsules were designed to improve the absorption and bioavailability of drug. Microcapsules of Aceclofenac were formulated by employing sodium alginate, two natural polymers-gum kondagogu and gum karaya. The prepared microcapsules were free flowing, discrete spherical shape was characterised by scanning electron microscopy (SEM). Microencapsulation efficiency was in the range of 60-80% and they exhibited good mucoadhesive property. Invitro dissolution data revealed that formulations exhibit the zero order kinetics and followed non-fickian diffusion transport mechanism. The GI residence time of microcapsules were studied by X-Ray photographs. In-vitro release profile of formulation (F3) was found similar to that of marketed formulation. Preclinical pharmacological activity i.e. analgesic activity was conducted. This formulation exhibited the significant analgesic activity Mucoadhesive microcapsules prepared with sodium alginate, gum karaya and gum kondagogu found to be suitable for oral controlled release.

Keywords

Aceclofenac, Ionic-Gelation Method, Entrapment Efficiency, in Vitro Release.

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P. S. Shiju Kumar ¹, A. Ramesh Babu ²

Affiliations
1 Department of CSE, Hindustan Institute of Technology and Science, Chennai - 603103, Tamil Nadu, IN
2 School of Science and Humanities, Hindustan Institute of Technology and Science, Chennai - 603103, Tamil Nadu, IN

Abstract

Objectives: Nowadays wireless sensor networks are widely employed to improve business process models of industries, web service applications, defence sector, Internet of things, space exploration, etc. Mobile ad hoc networks and the sensor networks are the two major categories of wireless ad hoc network. In both types, there is no fixed topology and centralized management system. So there is in need of different conditions to design protocols for routing wireless ad hoc networks. Method: ZigBee is one of the renewed standard of wireless personal area network aimed to cost-effective, reliable, low-power consumption as well as products and applications are scalable. Routing among the nodes is one among the most important function in data communication networks. The standard called ZigBee will support a combination of tree routing and on-demand vector routing. Findings: The present study involves various routing techniques in ZigBee wireless networks in contrast with other wireless networks. Various tools were employed to compare and assess the routing protocols. The results of the study reveals shortcut tree routing have advantages of better throughput, best packet delivery ratio and a lower end to end delay. Application: Shortcut tree routing gives best routing path viable for the packets and also decreases tree link associated traffic load in a greater extent. Also provides recommendable routing performance to AODV reactive routing protocol.

Keywords

Mobile Ad Hoc Network, On-Demand Routing, Wireless Sensor Network, Tree Routing, ZigBee

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