Ghulam Ishaq Khan Institute of Engineering Sciences and Technology

About: Ghulam Ishaq Khan Institute of Engineering Sciences and Technology is a education organization based out in Topi, Pakistan. It is known for research contribution in the topics: Thin film & Quantum efficiency. The organization has 618 authors who have published 940 publications receiving 10674 citations.

Numerical and Experimental Analysis of a Spiral Horizontal Axis Wind Turbine

Abstract: This paper presents results of design, analysis, manufacturing and testing of a spiral horizontal axis wind turbine. In first step, modeling and computational fluid dynamic (CFD) analysis was performed. Helix blades angle for spiral rotors of outer and inner diameter of 0.85 and 0.45m, respectively was optimized. In the second step, as per optimized spiral rotor dimensions, a prototype was manufactured. Experiments were carried out for torque and power calculations; obtained results are discussed.

Evaluation of a Redox-Active Cu-MOF and Co-MOF as Electrode Materials for Battery–Supercapacitor-Type Hybrid Energy Storage Devices

Abstract: The emerging supercapattery imparts optimum electrochemical performance by synchronizing the admirable power density and cyclic stability of supercapacitors with the high energy density characteristic of batteries. The strong bonds of a metal center with an organic linker give rise to a unique group of porous materials known as metal–organic frameworks (MOFs). Here, we state the synthesis and electrochemical analyzation of a copper-MOF and cobalt-MOF. The initial specific capacity revealed in the three-electrode assembly for the Cu-MOF and Co-MOF is 451 and 103 C g–1 at 3 mV s–1, respectively. Owing to the favorable characteristics of the Cu-MOF, a supercapattery device is fabricated as Cu-MOF//activated carbon. The device exhibits energy and power densities of 41 Wh g–1 and 2400 W kg–1, respectively, with a reversible capacity retention of 92% and coulombic efficiency of 99%. Moreover, to elucidate the capacitive and diffusive contributions of the battery–supercapacitor, Dunn’s model is adapted. The favorable properties of the Cu-MOF electrode as a battery-grade material may be adapted for future energy storage applications.

Orange Dye Thin Film Electrochemical Hygrometers

Abstract: Electrochemical hygrometers have been fabricated using orange dye (OD) C 17 H 17 N 5 O 2 thin films, deposited from aqueous solution under normal conditions. The films were deposited on zinc substrates from 10 wt.% solution of OD in distilled water. These films were than used to make samples of Zn/OD-TP/Cu, Zn/OD/Cu and Zn/OD/Graphite (TP stands for tissue paper); copper electrode was used in the form of a mesh and the graphite in the form of a porous solid. Properties of the samples were investigated in a range of 46-78% humidity. Output voltage and current of the sensors were monitored in electrochemical mode of operation, showing a rise of 8 and 100 times, respectively, with an increase in humidity. These electrochemical hygrometers may be potentially useful for developing humidity meters.

Architectural power macromodeling technique for DSP architectures

Abstract: A key challenge in the design of low power digital systems is the fast and accurate estimation of power dissipation. In this paper, we present a look-up-table (LUT) based power macromodeling technique for digital signal processing (DSP) architecture in terms of the statistical knowledge of their primary inputs/ouputs. During the power estimation procedure, the sequence of an input stream is generated by a genetic algorithm (GA) using input metrics. Then, a Monte Carlo zero-delay simulation is performed and a power dissipation macromodel function is built from power dissipation results. From then on, this macromodel function can be used to estimate power dissipation of the system just by using the statistics of the macro-block's primary inputs/outputs. The most important contribution of the method is that it allows fast power estimation of intellectual property (IP) based design by a simple addition of individual power consumptions. This makes the power modelling of SoCs an easy task that permits evaluation of power features at the architectural level. In order to evaluate our model, we have constructed IP-based DSP system using different IP macro-blocks. In experiments with individual IP macro-blocks, the results are effective and highly correlated, with an average error of just 1–3%.