This paper describes a novel solution to a mobile climbing robot on magnetic wheels, designed for inspecting the interior surfaces in gas tanks made out of thin metal sheets. These surfaces were inaccessible by previous climbing robots due to the following restrictions: 1. Ridges, where the magnetic force decreases to almost zero 2. Angular transitions between the surfaces (135°) 3. Thin metal ...

this study aimedat investigating the difference between male and female iranian upper-intermediate efl learners in terms of critical thinking, meta-cognitive awareness listening strategies, and selection of meta- cognitive listening strategies. to this end, one hundred and fifty language learners (including males and females with average age of 26.5) were selected through homogenised process to...

There is increasing interest in childhood maltreatment as a potent stimulus that may alter trajectories of brain development, induce epigenetic modifications and enhance risk for medical and psychiatric disorders. Although a number of useful scales exist for retrospective assessment of abuse and neglect they have significant limitations. Moreover, they fail to provide detailed information on ti...

The star-critical Ramsey number r∗(H1,H2) is the smallest integer k such that every red/blue coloring of the edges of Kn −K1,n−k−1 contains either a red copy of H1 or a blue copy of H2, where n is the graph Ramsey number R(H1,H2). We study the cases of r∗(C4, Cn) and R(C4,Wn). In particular, we prove that r∗(C4, Cn) = 5 for all n > 4, obtain a general characterization of Ramsey-critical (C4,Wn)...

This research introduces a research effort at the Peter Kiewit Institute in Omaha, Nebraska by investigating the performances of current wireless real-time localization technologies. Futhermore, the research shows how localization technologies can be applied to sensoraided intelligent mobile robots for high-level navigation functions for indoor construction security and material delivery. Senso...

The metal-insulator transition (MIT) caused purely by alloy disorder in a Zno 3Cdo 7Se semiconductor alloy has been probed by using persistent photoconductivity. Key parameters that describe the MIT, including the critical electron concentration n, and the energy tail states distribution parameter Eo, have been determined experimentally. Our results, together with those obtained for impurity-do...

Verification of the serviceability limit state of vibrations due to traffic live loads can be neglected in conventional types of concrete road bridges but becomes critical in the design of slender structures like Under-Deck CableStayed bridges. The novelty of the work presented in this article is that an innovative vehicle-bridge interaction model is employed, in which realistic wheel dimension...

This paper describes the analysis of Pull-Based Asynchronous Rekeying Framework (ARF), a recently proposed solution to the scalable group key management problem in secure multicast. A model of this protocol is constructed in Alloy, a lightweight relational modeling language, and analyzed using the Alloy Analyzer, a fully automatic simulation and checking tool for Alloy models. In this analysis,...

In operation of high-speed wheeled robots on rough terrain, it is significantly important to predict or measure the interaction between wheel and ground in order to maintain optimal maneuverability. Therefore, this paper proposes an easy way to estimate wheel lift and suspension force of a highspeed wheeled robot on uneven surfaces. First of all, a high-speed robot which has six wheels with ind...