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Wyświetlanie 1-10 z 95
Tytuł:
Rock strength anisotropy in high stress conditions: a case study for application to shaft stability assessments
Autorzy:
Watson, J. M.
Vakili, M.
Jakubowski, M.
Tematy:
anisotropy
high stress
numerical modeling
constitutive model
Pokaż więcej
Wydawca:
Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
Powiązania:
https://bibliotekanauki.pl/articles/178168.pdf  Link otwiera się w nowym oknie
Opis:
Although rock strength anisotropy is a well-known phenomenon in rock mechanics, its impact on geotechnical design is often ignored or underestimated. This paper explores the concept of anisotropy in a high stress environment using an improved unified constitutive model (IUCM), which can account for more complex failure mechanisms. The IUCM is used to better understand the typical responses of anisotropic rocks to underground mining. This study applies the IUCM to a proposed rock shaft located in high stress/anisotropic conditions. Results suggest that the effect of rock strength anisotropy must be taken into consideration when assessing the rock mass response to mining in high stress and anisotropic rock conditions.
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Reliability and validity of a novel Isokinetic Knee Dynamometer System
Autorzy:
Riemann, Bryan M.
Watson, Matthew D.
Davies, George J.
Tematy:
peak moment
strength assessment
lower extremity
peak torque
moment szczytowy
ocena wytrzymałości
kończyna dolna
moment obrotowy
Pokaż więcej
Wydawca:
Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
Powiązania:
https://bibliotekanauki.pl/articles/55622101.pdf  Link otwiera się w nowym oknie
Opis:
Purpose: The aim of this work was to determine the intersession reliability and validity of a recently developed prototype Isokinetic Knee Dynamometer to assess isokinetic knee extension and flexion peak moments compared to a Biodex System 4 dynamometer. Methods: Thirty--five healthy participants performed two sessions (48-h separation) of bilateral concentric isokinetic knee extension and flexion on both isokinetic devices at 60 °/s (6 repetitions), 180 °/s (10 repetitions) and 240 °/s (15 repetitions). Dynamometer and limb order were randomized among participants while peak moment of each set was used for data analysis. Results: The Isokinetic Knee Dynamometer had excellent relative reliability, comparable to the System 4, and both systems displayed acceptable absolute reliability. Proportional biases were observed favoring the System 4 during knee extension of both limbs at 60 °/s and the dominant limb at 180 °/s, and fixed biases favoring the Isokinetic Knee Dynamometer in seven conditions. Relative agreement between systems was good across all test conditions with the majority demonstrating excellent agreement. Conclusions: These data support the Isokinetic Knee Dynamometer as a reliable and valid knee isokinetic testing system. Due to its reduced system complexity, space requirements, and production cost, the Isokinetic Knee Dynamometer may increase the clinical utilization of isokinetic knee assessments. Finally, these data fill an existing isokinetics literature void with the results supporting similar and acceptable measurement properties jointly for dominant and non-dominant limbs and at the higher testing velocities considered.
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Observations of the pulsating subdwarf B star Feige 48 : constraints on evolution and companions
Autorzy:
Krzesiński, Jerzy
Kurtz, D. W.
Kawaler, S. D.
Watson, T. K.
Good, S.
Pakstiene, E.
Carlton, R. F.
Koen, C.
Schuh, S. L.
Riddle, R.
Deetjen, J. L.
Vuckovic, M.
Grauer, A.
Jiang, X. J.
Handler, G.
Moskalik, P.
Mukadam, A.
González Pérez, J. M.
Meištas, E.
Østensen, R.
Baran, A.
Kilkenny, D.
Vauclair, G.
Reed, M. D.
Bromage, G.
Chevreton, M.
Bradley, P. A.
Hürkal, Ö
Kalytis, R.
Ališauskas, D.
Anderson, R.
Kilic, M.
Ulla, A.
Burleigh, M.
Dreizler, S.
Cunha, M. S.
Janulis, R.
Wood, M. A.
Solheim, J. E.
Zoła, Stanisław
Stachowski, Grzegorz
Ogłoza, W.
Klumpe, E. W.
Dolez, N.
Opis:
Since pulsating subdwarf B (sdBV or EC14026) stars were first discovered, observational efforts have tried to realize their potential for constraining the interior physics of extreme horizontal branch stars. Difficulties encountered along the way include uncertain mode identifications and a lack of stable pulsation mode properties. Here we report on Feige 48, an sdBV star for which follow-up observations have been obtained spanning more than four years. These observations show some stable pulsation modes. We resolve the temporal spectrum into five stable pulsation periods in the range 340–380 s with amplitudes less than 1 per cent, and two additional periods that appear in one data set each. The three largest amplitude periodicities are nearly equally spaced, and we explore the consequences of identifying them as a rotationally split ℓ= 1 triplet by consulting a representative stellar model. The general stability of the pulsation amplitudes and phases allows us to use the pulsation phases to constrain the time-scale of evolution for this sdBV star. Additionally, we are able to place interesting limits on any stellar or planetary companion to Feige 48.
Dostawca treści:
Repozytorium Uniwersytetu Jagiellońskiego
Artykuł
Tytuł:
The optical two- and three-dimensional fundamental plane correlations for nearly 180 gamma-ray burst afterglows with Swift/UVOT, RATIR, and the Subaru Telescope
Autorzy:
Dainotti, Maria
Li, L.
Ramirez-Ruiz, E.
Sánchez-Vázquez, E. G.
Kann, D. A.
Zambrano-Tapia, A.
Oates, S. R.
Becerra, R. L.
Fraija, N.
Kutyrev, A. S.
Tran, B.
Fuentes, M.
Zoła, Stanisław
Prochaska, J. X.
Lee, W. H.
Richer, M. G.
Kalinowski, K. K.
Zambrano-Tapia, L.
Levine, D.
Butler, N. R.
Young, S.
Cenko, S. B.
González, J. J.
Watson, A. M.
Opis:
Gamma-ray bursts (GRBs) are fascinating events due to their panchromatic nature. We study optical plateaus in GRB afterglows via an extended search into archival data. We comprehensively analyze all published GRBs with known redshifts and optical plateaus observed by many ground-based telescopes (e.g., Subaru Telescope, RATIR) around the world and several space-based observatories such as the Neil Gehrels Swift Observatory. We fit 500 optical light curves, showing the existence of the plateau in 179 cases. This sample is 75% larger than the previous one, and it is the largest compilation so far of optical plateaus. We discover the 3D fundamental plane relation at optical wavelengths using this sample. This correlation is between the rest-frame time at the end of the plateau emission, $T_{opt}^{*}$, its optical luminosity, $L_{opt}$, and the peak in the optical prompt emission, $L_{peak,opt}$, thus resembling the three-dimensional (3D) X-ray fundamental plane (the so-called 3D Dainotti relation). We correct our sample for redshift evolution and selection effects, discovering that this correlation is indeed intrinsic to GRB physics. We investigate the rest-frame end-time distributions in X-rays and optical ($T_{opt}^{*}$, $T_{X}^{*}$), and conclude that the plateau is achromatic only when selection biases are not considered. We also investigate if the 3D optical correlation may be a new discriminant between optical GRB classes and find that there is no significant separation between the classes compared to the Gold sample plane after correcting for evolution.
Dostawca treści:
Repozytorium Uniwersytetu Jagiellońskiego
Artykuł
Wyświetlanie 1-10 z 95

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