ePortfolio has become ubiquitous in higher education over the course of the last decade, with faculty and institutions devoting both time and monetary resources to its use. Given this trend, the purpose of this study was to investigate the landscape of ePortfolio research to determine what evidence exists for ePortfolio’s impact on student outcomes. We identified four trends in the research: ar...

This paper presents an attitude control algorithm for a Reusable Launch Vehicle (RLV) with a low lift/drag ratio (L/D < 0.5), in the presence of external disturbances, model uncertainties, control output constraints and the thruster model. The main novelty of proposed control strategy is a new combination of the attitude control methods included backstepping, dynamic inversion and adaptive cont...

Accurate maintenance of a geometric configuration between multiple autonomous vehicles can often accomplish objectives impossible for a single vehicle. Much work on formation control in the current literature relies on the leader-follower approach, where some vehicles are designated as leaders while others are designated as followers. The leaders track predefined trajectories, and the followers...

the aim of this manuscript is to study the implication of aluminium-oxide nanofluid for an amphibious vehicle engine (viable on land and under water) cooling system both analytically and experimentally. to achieve this, a one-dimensional model of the engine cooling system (radiator) is considered through a computational fluid code in which the mass flow rate for a range of the coolant temperatu...

Comparative analysis of two algorithms for underwater vehicle positioning using measurements range to a drifting buoy and radial velocity is carried out. The based on building location contours polynomial filtering are considered. Invalid data rate RMS position error analyzed compare the algorithms. Based made, algorithm accepted as preferable.

customer service level is of prime importance in today competitive world and has various dimensions with delivery quality being one of the most important ones. delivery quality has several parameters such as deliver time window options, time window size, etc. in this paper we focus on one of these parameters, namely time window setting. it has a direct impact upon customer satisfaction and busi...