Dissimilar metal welds (DMWs) are commonly used when a high strength steel is overlaid with corrosion resistant alloy (CRA) for petrochemical applications. There have been reported failures of these DMWs during subsea service while under cathodic protection (CP). These caused by local hydrogen embrittlement susceptible microstructures that form at the weld fusion boundary. Hydrogen-assisted cra...

Q-slope is one of the most recent empirical geomechanical classification systems and least studied in South America. This study aims to expand knowledge base regarding method demonstrate its applicability reliability rock slopes Andean countries, such as Ecuador. To this end, thirty rocky have been characterized considering (1) physical visual approach—geographic location, climate, lithology, a...

This paper presents the results of a comprehensive study on the efficiency of planar parallel mechanisms, considering their kinetostatic performance and also, their workspace. This aim is approached upon proceeding single- and multi-objective optimization procedures. Kinetostatic performances of ten different planar parallel mechanisms are analyzed by resorting to a recent index, kinematic sens...

Background: Aim of this study is to evaluate the accuracy of the gated volumetric modulated arc therapy (VMAT/RapidArc) using 2D planar dosimetry, DynaLog files and COMPASS 3D dosimetry system. Materials and Methods: Pre-treatment quality assurance of 10 gated VMAT plans was verified using 2D array and COMPASS 3D dosimetry system. Advantage of COMPASS over 2D planar is that it provides the clin...

We investigate the question of which graphs have planar emulators (a locally-surjective homomorphism from some finite planar graph)—a problem raised already in Fellows’ thesis (1985) and conceptually related to the better known planar cover conjecture by Negami (1986). For over two decades, the planar emulator problem lived poorly in a shadow of Negami’s conjecture—which is still open—as the tw...

This paper addresses a new approach to the problem of selecting contact locations for grasping in the presence of shape and contact location uncertainty. Focusing on twodimensional planar objects and two-finger grasps for simplicity, we present a principled approach for selecting contact points by minimizing the risk of force-closure failure. The key contribution of the paper is the risk measur...

I n previous work, the authors developed a novel f ramework for ‘hyper-redundant’ robot kinematic analysis and algorithm development. In order t o validate and denioiistrate that work, a 30 degree-of-freedom planar hyper-redundant manipulator was constructed. This paper reviews the implementation of this robot and su1))iiiari:es experimental work in hyper-redundant manipulrilion, obstacle avoid...

Non-Hermitian systems host unconventional physical effects that be used to design new optical devices. We study a non-Hermitian system consisting of 1D planar optical waveguides with suitable amount of simultaneous gain and loss. The parameter space contains an exceptional point, which can be accessed by varying the transverse gain and loss profile. When light propagates through the waveguide s...

The bondage number of a graph G is the cardinality of a smallest set of edges whose removal results in a graph with domination number larger than that of G. The bondage number measures to some extent the robustness of a network with respect to link failure. This note mainly considers some conjectures on the bondage number of a planar graph, and shows limitations of known methods and presents so...