2,274 research outputs found
R.C. Farrell Store
No full textPhotograph - People standing in front of R.C. Farrell, General Merchant store, Athabasca, Alberta. Left to right: Lance Smith, Louis Menard, Romeo Farrell, Athela LaRue Farrell, and Ray Vari
A Review of: Biobloc Therapy, by John R.C. Mew
No full textThis text, written and published by its British author, John R.C. Mew, details an integrated orthodontic and orofacial myofunctional treatment approach entitled Biobloc Therapy [...
Footwall rotation in an oceanic core complex quantified using reoriented Integrated Ocean Drilling Program core samples
No full textOceanic core complexes expose lower crustal and upper mantle rocks on the seafloor by tectonic unroofing in the footwalls of large-slip detachment faults. The common occurrence of these structures in slow and ultra-slow spread oceanic crust suggests that they accommodate a significant component of plate divergence. However, the subsurface geometry of detachment faults in oceanic core complexes remains unclear. Competing models involve either: (a) displacement on planar, low-angle faults with little tectonic rotation; or (b) progressive shallowing by rotation of initially steeply dipping faults as a result of flexural unloading (the “rolling-hinge” model). We address this debate using palaeomagnetic remanences as markers for tectonic rotation within a unique 1.4 km long footwall section of gabbroic rocks recovered by Integrated Ocean Drilling Program (IODP) sampling at Atlantis Massif oceanic core complex on the Mid-Atlantic Ridge (MAR). These rocks contain a complex record of multipolarity magnetizations that are unrelated to alteration and igneous stratigraphy in the sampled section and are inferred to result from progressive cooling of the footwall section over geomagnetic polarity chrons C1r.2r, C1r.1n (Jaramillo) and C1r.1r. For the first time we have independently reoriented drill-core samples of lower crustal gabbros, that were initially azimuthally unconstrained, to a true geographic reference frame by correlating structures in individual core pieces with those identified from oriented imagery of the borehole wall. This allows reorientation of the palaeomagnetic data, placing far more rigorous constraints on the tectonic history than those possible using only palaeomagnetic inclination data. Analysis of the reoriented high temperature reversed component of magnetization indicates a 46° ± 6° anticlockwise rotation of the footwall around a MAR-parallel horizontal axis trending 011° ± 6°. Reoriented lower temperature components of normal and reversed polarity suggest that much of this rotation occurred after the end of the Jaramillo chron (0.99 Ma). The data provide unequivocal confirmation of the key prediction of flexural, rolling-hinge models for oceanic core complexes, whereby oceanic detachment faults initiate at higher dips and rotate to their present day low-angle geometries as displacement increases.<br/
Experimental Research and Numerical Analysis on the Law of Deteriorated Performance for R.C. Frame Structure with Seismic Damages under Elevated Temperature (part II)
No full textThe cracks were pre-settled to the R.C. frame structure caused by earthquake which was defined as the damage index ω during the modeling process with analysis software-ANASYS. The temperature field contour curve were calculated for the column and beam, the law of deteriorated bearing capacity with time for the R.C. frame structure under elevated temperature were brought forward，which can adapt to R.C. frame structure with different damage index ω caused by earthquake.The relationship between ω and deteriorated bearing capacity for R.C. frame structure was also given, which was proved to be effective and correct according to comparison with the data recorded from the elevated temperature experiment designed by author.</jats:p
Internal Friction in The Region of The Grain Boundary Peaks in Pure Zirconium and Dilute Zirconium Alloys
No full textTitle: Internal Friction in The Region of The Grain Boundary Peaks in Pure Zirconium and Dilute Zirconium Alloys, Author: R.C. Robinson, Location: ThodeInternal friction, in the region of the
grain boundary peaks, has been examined in nominally
pure zirconium and dilute zirconium alloys. Experimental
observations were made using both torsion and
reed internal friction pendulums. The effect of various
heat treatments on the peaks were investigated. Strain
amplitude dependent damping in the region of the Low
Temperature Peak was observed. A qualitative model
is presented to explain the experimental observations.ThesisMaster of Engineering (ME
De Fast-Fourier Transform: Het gebruik van de routine van R.C. Singleton
No full textDoel van dit rapport is de lezer inzicht te verschaffen in het gebruik van de FFT-routine van R.C. Singleton zoals die in het rekencentrum van de T.H. - Delft in gebruik is. Voor een beschrijving van de werking van deze routine wordt verwezen naar het in de literatuurlijst vermelde artikel van Singleton (Lit. 1). Met nadruk wordt erop gewezen dat er meerdere FFT-routines in omloop zijn die alle anders werken en daarom in gebruik kunnen verschillen. Het onderhavige rapport beschrijft uitsluitend het gebruik van de routine van Singleton. Als laatste punt in deze inleiding wordt speciaal het boek van Brigham genoemd (Lit. 2) waarin zeer veel informatie te vinden is over het gebruik van de FFT-methodeHydraulic EngineeringCivil Engineering and Geoscience
The Challenge of Reversing Theories to Hybridize Structures with Fiber Metal Laminate Design Concepts
No full textTo further optimize aeronautical structures, an increased level of material hybridization is required. Optimization efforts aim to identify optimal design solutions that satisfy prescribed requirements. However, this demands reversal of currently available knowledge on hybrid structural technologies, which are often formulated as theories predicting performance based on known load cases and selected material configurations. After briefly reviewing the available fundamental theories for strength, fatigue, and damage tolerance of hybrid structures, this paper discusses the challenges in reversing these theories. Solutions are proposed in which theories can be approximated to significantly reduce the computational time while maintaining the required level of accuracy.Green Open Access added to TU Delft Institutional Repository ‘You share, we take care!’ – Taverne project https://www.openaccess.nl/en/you-share-we-take-care Otherwise as indicated in the copyright section: the publisher is the copyright holder of this work and the author uses the Dutch legislation to make this work public.Structural Integrity & Composite
Strength and ductility of R.C. columns strengthened with steel angles and battens
No full textIn this paper the behaviour of R.C. members externally strengthened with steel angles and battens subjected to axial force and bending moment is analysed. A fibre model was utilised to predict the moment–curvature diagrams of the strengthened members on the basis of stress–strain curves of the constituent materials (confined concrete, steel bars and angles) recently derived by the author. The stress–strain curves utilised for compressed concrete were able to take into account the confinement effects induced by longitudinal (bars and steel angles) and transverse (stirrups and battens) steel reinforcements. Constitutive laws in compression for confined concrete and steel bars and angles were utilised for a preliminary calibration of the compressive response of axially loaded columns strengthened with steel cages. Therefore axial force and bending moment diagrams and moment curvature diagrams were derived and verified against experimental data available in the literature. Finally, a parametric analysis showing the influence of the main parameters governing the problems (angle and strip geometry and mechanical properties of constituent material) was carried out, mainly referring to moment axial force domains, moment curvature diagrams. The analysis showed the effectiveness of this reinforcing technique in improving both the strength and the ductility of R.C. columns
Experimental performance evaluation of line-focus sun trackers
No full textTwo sun trackers have been tested for tracking accuracy on an sun tracker. Both performed well during the entire test period. Their tracking performance as a function of insolation level was established, and their overall tracking accuracy (rms tracking error) was calculated. Both the flux-line and the shadowband tracker were found to have an effective rms error of about 1 milliradian. This information was used to determine the impact that the two trackers have on the annual energy performance of typical parabolic trough concentrating collectors. One milliradian rms tracking errors were found to result in negligibly small annual performance losses
R.C. Knowlton - Jeweller
No full textPhotograph - Roy Knowlton and a dog standing in the doorway of his store, Athabasca, Alberta. There are goods visible in the windo
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