National Defence University, Pakistan

About: National Defence University, Pakistan is a education organization based out in Islamabad, Pakistan. It is known for research contribution in the topics: Context (language use) & Decision support system. The organization has 802 authors who have published 816 publications receiving 3701 citations. The organization is also known as: National Defence University of Pakistan & National Defence University Islamabad.

Complex Dynamic Method of Web Applications Verification by the Criterion of Time Minimization

Abstract: This article presents the complex dynamic method of Web application verification according to the criterion of minimum time with a further review of related tools.Dynamic verification methods use the results of real work, tested by the software system or its prototypes, to verify the compliance of these results with the requirements and design decisions. The review includes methods of dynamic verification - testing and verification monitoring. Software verification support tools - jUnit (testing) and AppDynamics (monitoring) are analyzed. The classification of methods is based on the list of important features, such as functionality, performance, reliability, and ease of use. Dynamic verification can be real or simulated, depending on whether it is used in its course, the software, its prototype or executable model.The experimental part presented as results of monitoring and test running on pre-prepared software, which is based on the following technology stack: programming language (PL) – Java, Database Management System (DBMS) – PostgreSQL, monitoring service (MS) – AppDynamics, test framework (TF) – JUnit and operating system (OS) Ubuntu 15.4 – a closed system that will act as a testing ground, which in turn will host the software package.

The changing political trends in erstwhile FATA: a study of the last three elections:

Abstract: This study investigates the changing political trends in erstwhile Federally Administered Tribal Areas of Pakistan. Analysis of the last three elections (2008, 2013, 2018) shows a substantial chang...

The impedance characterization of Carbon Nanotubes - Fumed Silica Poly (vinyl alcohol) Composites

Abstract: Carbon Nanotube (CNT) was grown on the surface of fumed silica via chemical vapor deposition (CVD) method. In this work, silica acted as a site that holds CNT together, which prevents further agglomeration during composite processing. Iron catalyst at different loading (7.5 wt. % up to 25 wt. %) was introduced via impregnation method to synthesize CNT at 1000°C, under methane flow. Floating catalyst method was used where ferrocene (2.5 wt. % and 5 wt. %) was used as starting reactants together with toluene at 760°C. The reaction time was set at 1 hour for both methods. It was later confirmed via SEM images that the floating catalyst method is more suitable to produce a large amount of CNTs. The sample synthesized via floating catalyst method at both 2.5 wt.% and 5 wt. % ferrocene was later used to prepare composites. Composite films of the particles in poly (vinyl alcohol) (PVOH) were cast and their TEM images show that the dispersion is indeed uniform. From impedance measurement, it was found that the particles synthesized via floating catalyst method were found to form an electrically-conductive percolated network with percolation threshold of 1 wt. %, obtained via percolation equation.

Methods for Computing the Radiation Characteristics of Airborne Aperture Antennas Placed under Radomes of Various Shapes

Abstract: We present and discuss a numerical method for the computation of radiation characteristics of the aperture antennas protected with various dielectric radomes. This method enables one to calculate the field, radiated from an aperture in a perfectly absorbing screen in the presence of a radome or some other scattering object. Using this method, we obtain the far-field radiation patterns for sample antennas with dielectric radomes of several shapes. The method allows selecting the thickness of radome that is optimal for minimizing the signal distortions caused by the protective radome. It can also be applied in the numerical design of two-layer radomes.

Reduction behaviour of tungsten dioxide by various concentration of carbon monoxide

Abstract: The reduction behaviour of tungsten dioxide (WO2) under both non-isothermal and isothermal conditions in various concentrations of carbon monoxide (CO) were investigated by using temperature-programmed reduction (TPR) and X-ray diffractometry (XRD) techniques. The influences of carbon monoxide concentration (20 and 40% v/v CO in N2) on the reducibility of WO2 to tungsten metal W have been investigated in the temperature range 40 – 900 oC. The TPR profile shows that reduction using 40% CO produce higher thermal conductivity detector (TCD) signal in comparison by using 20 % CO. XRD results show that, by increasing the concentration of CO, the intensity of WO2 decreases and tungsten carbide (WC) peak appeared. Moreover, holding the reduction time for 30 min in 20 and 40% of CO resulted in the formation of new peak of tungsten hemi carbide (W2C) and WC, respectively. It can be concluded that by using CO, reduction steps comprise of WO2 → W → W2C → WC. The reduction behaviour of WO2 is strongly dependent on the concentration of CO and hold time of reaction. Furthermore, excess of CO by isothermal reduction results in the formation of WC.