Higher College of Technology

About: Higher College of Technology is a based out in . It is known for research contribution in the topics: Computer science & Higher education. The organization has 369 authors who have published 379 publications receiving 729 citations.

Radius dependence of the electrical conductivity of zigzgag carbon nanotubes

Abstract: The radius dependence of the electrical conductivity of metallic and semiconducting zigzag carbon nanotubes (CNTs) is theoretically studied. The investigation was done semiclassically by solving the Boltzmann transport equation to derive current density as a function of a homogenous axial dc field and radius of the tube. The analysis was numerically carried out by varying the radius of the materials at a constant temperature. Plots of the normalized current density versus dc field applied along the axis of both materials are presented. We observed that in the case of the metallic zigzag CNTs as the radius increases, the electrical conductivity decreases. On the other hand, in the semiconducting zigzag CNT there was an increase as radius increases. This research shows that thinner metallic zigzag CNTs and thicker semiconducting zigzag CNTs are better conductors of electricity. This investigation therefore offers way of obtaining higher electrical conductivity in both materials without doping. This study therefore shows applications in the development of current conducting nano-devices for scientific systems.

Viral Marketing: A New Horizon and Emerging Challenges

Abstract: While companies have long been using electronic processes, the Internet and other digital technologies are packed with new and innovative ways to give customers more value. This challenge not only illustrates the basic concepts of traditional marketing but also modern marketing practices. It is important that businesses connect with customers more likely to gain their attention. It is also important for an advertisement campaign to be effective in being able to engage, surprise and enjoy users in promoting a brand or products spontaneously and induce word of mouth. For this reason, companies use a variety of communication methods, in particular online communication and digital marketing. Presently, marketing environment was revolutionised by the introduction of the internet and modern technology. In a new age of communication technology, the emphasis is evolving on marketing and consumer behaviour. One of the many marketing concepts is the era of interruption marketing, defined by all ads that capture the attention of the consumer as he does something else that comes to an end when new trends appear. Viral marketing can be one of the most popular breakdown marketing. Viral marketing is a marketing form that contacts users, in particular, through word of mouth on the Internet. Viral marketing has become more and more relevant in recent decades as social media networks such as Facebook, YouTube and Twitter are growing. The nature of this study is theoretical and covers related theories and literature. In this respect, the aim of the paper is to discuss the opportunities and challenges for marketers faced in a current environment presented by viral marketing. In a new age of communication technology, the emphasis is evolving on marketing and consumer behaviour. Diverse factors that directly or indirectly influence viral marketing are also discussed. Following the principles of viral marketing and how people communicate, a comprehensive analysis of key issues in the nature of viral marketing strategies will be introduced. This will be followed by an evaluation of the relevant subjects and possible risks. Finally, there will be a brief answer to the question of whether viral marketing is a critical new dimension to current century marketing.

A novel current controller design for grid-integrated PV inverter system

Abstract: Distributed generators are playing a vital role in supporting the grid in ever-increasing energy demands. Grid code regulation must be followed when integrating the photovoltaic inverter system to the grid. The paper investigates and analyzes a controller model for grid-connected PV inverters to inject sinusoidal current to the grid with minimum distortion. To achieve better tracking and disturbance rejection, a DSP-based current controller is designed with LCL filter. The controller gets the current feedback from the grid, compares it with reference current, and calculates duty cycle to generate PWM pulses to trigger H-bridge converters. The grid voltage is loaded to the initial value in proposed PR controller to ensure the initial inverter voltage to match the grid voltage. The paper presents a novel current controller algorithm for grid-connected inverter system, and simulation is done. A detailed analysis has been carried out to validate the proposed design algorithm. Experimental implementation of the current controller in the DC/AC converter circuits with an LCL filter is done for 5.4 kW to validate and match the simulation model.

In situ synthesis of mesostructured iron oxide nanoparticles embedded in L. camara: adsorption insights and modeling studies

Abstract: The current study involves the synthesis of Lantana camara (LC)–incorporated mesostructured iron nanoparticles for the removal of nickel ions from aqueous solution. By systematically varying the operational parameters such as metal ion concentration, pH, adsorbent dosage, contact time, and temperature, the desirable conditions of adsorption were determined. The favorable adsorption at higher temperatures implies that the system is exhibiting endothermic reactions and the Van’t Hoff plot suggested the spontaneous and feasible nature of the adsorption process. Another key point is the fast kinetics of the sorption process that occurred in the first 10 min of sorption processes. Among the kinetic models investigated, the sorption is better explained by pseudo-second-order model favoring chemical adsorption. Furthermore, the complexation of nickel ions with –COOH groups of the LC nanoparticles are confirmed in the FTIR studies and the mesoporous (162.1 A°) nature of nanoparticles are confirmed in the BET analysis. From the VSM analysis, the superparamagnetic nature of the mesoporous nanoparticles were revealed. Another important finding from the VSM results is the high saturation magnetization (66.9 emu/g) of the nanoparticles. Equally important is desorption studies where a maximum efficiency of 81% is obtained using 05 N HCl. With the help of the Langmuir modeling studies, the possible mechanism of sorption are explained and more importantly the monolayer adsorption capacity from the model was found to be 133 mg/g.

Ultra-Low Power 8-Transistor Modified Gate Diffusion Input Carbon Nano-Tube Field Effect Transistor Full Adder

Abstract: An ultra-low power 8-Transistor Modified Gate Diffusion Input (MGDI) Carbon Nano Tube Field Effect Transistor (CNTFET) Full Adder (FA) has been presented in this paper. The proposed 8-T MGDI CNTFET...