Heritage Institute of Technology

About: Heritage Institute of Technology is a based out in . It is known for research contribution in the topics: Support vector machine & Transconductance. The organization has 581 authors who have published 1045 publications receiving 8345 citations.

Numerical analysis of non-isothermal viscous jet with peripheral heat transfer

Abstract: A fluid jet ejected from micron size nozzle is a commonly occurring phenomenon in biomedical engineering, printing technology and micro-fluidic applications. Disintegration of a jet into drops occurs due to disturbances induced by external sources. This work explores the various sources of perturbation and their effect on jet disintegration through numerical simulation of a two-dimensional non-isothermal model. The mathematical approach uses a novel technique to combine analytical solutions for the energy balance equation in the radial direction to solve the complete two dimensional problem. The two dimensional energy balance equation is simultaneously solved together with the axi-symmetric Navier–Stokes equations using the slender-jet approximation to predict jet velocity. The energy balance takes into account of peripheral heat transfer to the environment through analytical expressions derived from radial approximations. The model helps in understanding the factors in dynamic temperature variations that eventually render the jet unstable. The distinguishing aspect of this work is the analysis of the effect of a periodic thermal perturbation applied at any point in the domain of a progressive jet, a situation typically encountered in thermal inkjet printers and not considered previously. Results presented for non-isothermal jets which are both stationary and moving illustrate the effect of jet velocity in propagation of perturbation and subsequent drop formation. The major contribution of this numerical study is that it provides an insight on novel ways of controlling droplet formation in bubble jet printers. This study demonstrates that thermal disturbance propagating from periodic heating can be manipulated to shape the droplets and control their breakage point along the jet.

Development of a Simplified Model for Completely Mixed Biofilm Reactor.

Abstract: A simplified model for the completely mixed biofilm process formulated correlations between entering and exiting substrate concentrations, average substrate flux in the biofilm and effective biofilm thickness. The model essentially considered the substrate mass transport into the biofilm as per Fick's second law and steady state substrate as well as biomass balance for biofilm. The numerical solution of the biofilm model involved evaluation of the average flux along with exiting substrate concentration and application of the Runge-Kutta method for determining the effective biofilm thickness. Accordingly, two computer programs were developed for the sake of quick solution. The solution model was successfully applied in several cases with varying range of representative input variables. The model performance was compared with available existing methods and validated with the experimental results. It was found as an easy, accurate and fast method that can be used for process design.

Analysis of a Dynamic Queuing Model for Secondary Users in Cognitive Radio Networks

Abstract: In recent years, the increased demand for wireless multimedia services has led to huge bandwidth crisis. The concept of Cognitive Radio Networks (CRN) has been proposed as a solution. In CRN, higher Primary User Activity leads to an increased number of Pre-empted Secondary Users (PSU). Since the PSUs are given priority over New Secondary Users (NSU), the NSUs might get starved. Due to this priority of PSUs less number low priority users can be served. The advent of the Internet of Things, the traffic pattern has become unpredictable. All this reasons required a Dynamic Cognitive Channel Allocation (DCCA) algorithm which has been proposed in this work which balances the service among the PSUs and NSUs as per priority of SU as well as avoiding starvation. Analysis of the proposed algorithm using Continuous Time Markov Chain Model shows an improvement over existing literature of 44.44% in NSU dropping probability and 22.8% improvement in NSU blocking probability with respect to arrival of PUs. Varying the arrival of SUs has resulted in an improvement of 58% and 45.75% in the dropping and blocking probabilities of NSUs respectively. The starvation of SUs has lowered by 32.52% with varying arrival rate of PU and 41.38% with varying arrival rate of SUs

Conceptual Framework for designing a Rural Distribution Model for FMCG products in India: A Situational Guide

Abstract: This paper reviews the challenges faced by FMCG companies in India in Rural Distribution and provides a concrete conceptual framework for rural distribution in India. Literature available on rural distribution models is sparse and this paper aims to advance that body of knowledge from a practitioner's point of view since the first author is also a practicing General Manager for Sales in a prominent multinational FMCG. Rural markets are very important for FMCG companies today owing to the increasing development of consumerism in the bottom of the pyramid. Rural markets are characterized by the 4 challenges (4A's) of rural marketing which correspond to the 4P's of marketing. This paper deals with the rural marketing challenge of Availability with special focus on a major rural marketing FMCG. The challenge of Availability corresponds to the fourth P of "Place". Qualitative as well as quantitative techniques have been used in building the framework.

Cooperative Sharing Based Inter and Intra Cellular Cognitive Radio Network and Architecture

Abstract: Cognitive radio networks utilize the available spectrum resource by spectrum sensing mechanisms and coordinate other users to perform spectrum access efficiently. These are the important functions of the medium access control (MAC) protocols. However, several challenges are associated with cognitive MAC protocols. Hence it is very difficult to support seamless communications, especially in CR cellular networks by CR MAC protocols. This paper has proposed cooperative sharing based inter and intra cellular network architecture. To support seamless communication, a modified MAC protocol has been proposed. A mathematical model has developed to justify the proposed scheme. A comparative study with conventional protocols has been analyzed graphically in terms of throughput and overall system efficiency.