cometadata/datacite-rtg-text-other-reclassification-records huggingface dataset:
The faint 2011 outburst of the black hole X-ray binary candidate MAXI J1543-564
Creators: name: Stiele, H.
name: Muñoz-Darias, T.
name: Motta, S.
name: Belloni, T. M.
Publisher: name: arXiv
Year: 2012
Subjects: subject: High Energy Astrophysical Phenomena (astro-ph.HE)
subject: Astrophysics of Galaxies (astro-ph.GA)
subject: FOS: Physical sciences

description: We report on a spectral-timing analysis of the black hole X-ray binary candidate MAXI J1543- 564 during its 2011 outburst. All 99 pointed observations of this outburst obtained with the Rossi X-ray Timing Explorer (RXTE) were included in our study. We computed the fundamental diagrams commonly used to study black hole transients, and fitted power density and energy spectra to study the spectral and timing parameters along the outburst. The determination of timing parameters and hence of exact transitions between different states was hampered by the rather low count rate at which his outburst was observed. We detected two periods of exponential decay, one after the source was brightest, which was interrupted by several flares, and another one during the high/soft state. The detection of these decays allowed us to obtain an estimate for the source distance of at least 8.5 kpc. This leaves two possible explanations for the observed low count rate; either the source has a distance similar to that of other black hole X-ray binary candidates and it is intrinsically faint, or it has a similar luminosity, but is located more than 12 kpc away from us. Furthermore, in the high/soft state the source spectrum appears to be completely disc dominated.
description: 11 pages, 5 figures, accepted for publication in MNRAS
Channel drop filter based on photonic crystal ring resonator
Creators: name: Alipour-Banaei, Hamed
name: Jahanara, Mahsa
name: Mehdizadeh, Farhad
Publisher: name: The Faculty of Fundamental Problems of Technology, Wrocław University of Science and Technology, Poland
Year: 2018
Subjects: photonic crystal, optical filter, ring resonator, quality factor

description: OPTICA APPLICATA; 04/2018; ISSN 1429-7507
Selected topics in homogenization of transport processes in historical masonry structures
Creators: name: Sýkora, Jan
name: Zeman, Jan
name: Šejnoha, Michal
Publisher: name: arXiv
Year: 2012
Subjects: subject: Materials Science (cond-mat.mtrl-sci)
subject: FOS: Physical sciences

description: The paper reviews several topics associated with the homogenization of transport processed in historical masonry structures. Since these often experience an irregular or random pattern, we open the subject by summarizing essential steps in the formulation of a suitable computational model in the form of Statistically Equivalent Periodic Unit Cell (SEPUC). Accepting SEPUC as a reliable representative volume element is supported by application of the Fast Fourier Transform to both the SEPUC and large binary sample of real masonry in search for effective thermal conductivities limited here to a steady state heat conduction problem. Fully coupled non-stationary heat and moisture transport is addressed next in the framework of two-scale first-order homogenization approach with emphases on the application of boundary and initial conditions on the meso-scale.
description: 19 pages, 13 figures, 2 tables
The Implications of Water in Tight Gas – A Case Study on Shell Canada's Groundbirch Position in the Montney
Creators: name: Langille, David Lindsay Alexander
Publisher: name: University of Calgary
Year: 2015
Subjects: subject: Energy
subject: Engineering--Chemical
subject: Engineering--Petroleum
subject: water chemistry
subject: tight gas
subject: hydraulic fracturing
subject: fracturing fluid
subject: unconventional gas

description: Slickwater hydraulic fracturing has become commonplace in tight gas developments as with Shell Canada's Groundbirch position in the Montney play. Water is a technical and non-technical issue for both surface and subsurface disciplines. Critical concerns pertaining to water at Groundbirch included sourcing water to stimulate wells, ensuring that the water used in hydraulic fracturing was not detrimental to the production of natural gas, and predicting the flows and potential storage volumes of water throughout the field such that water handling facilities could be appropriately designed enabling water to be optimally recycled. This thesis presents the author's work at Groundbirch as a pragmatic basis for developing a hydraulic fracturing water chemistry specification, water forecasts and balances for design considerations, and special analyses used to better quantify the mobility of water or aqueous phase trapping potential in tight gas sands, while emphasizing the importance of acquiring quality water rate and chemistry data.
Measuring Expansion Velocities in Type II-P Supernovae
Creators: name: Takats, K.
name: Vinko, J.
Publisher: name: arXiv
Year: 2011
Subjects: subject: Solar and Stellar Astrophysics (astro-ph.SR)
subject: FOS: Physical sciences

description: We estimate photospheric velocities of Type II-P supernovae using model spectra created with SYNOW, and compare the results with those obtained by more conventional techniques, such as cross-correlation, or measuring the absorption minimum of P Cygni features. Based on a sample of 81 observed spectra of 5 SNe, we show that SYNOW provides velocities that are similar to ones obtained by more sophisticated NLTE modeling codes, but they can be derived in a less computation-intensive way. The estimated photospheric velocities (v_model) are compared to ones measured from Doppler-shifts of the absorption minima of the Hbeta and the FeII \lambda5169 features. Our results confirm that the FeII velocities (v_Fe) have tighter and more homogeneous correlation with the estimated photospheric velocities than the ones measured from Hbeta, but both suffer from phase-dependent systematic deviations from those. The same is true for comparison with the cross-correlation velocities. We verify and improve the relations between v_Fe, v_Hbeta and v_model in order to provide useful formulae for interpolating/extrapolating the velocity curves of Type II-P SNe to phases not covered by observations. We also discuss the implications of our results for the distance measurements of Type II-P SNe, and show that the application of the model velocities is preferred in the Expanding Photosphere Method.
description: 19 pages, 10 figures, accepted in MNRAS
Subgroups of Genus-2 Quasi-Fuchsian groups and Cocompact Kleinian Groups
Creators: name: Rao, Zhenghao
Publisher: name: arXiv
Year: 2023
Subjects: subject: Geometric Topology (math.GT)
subject: Dynamical Systems (math.DS)
subject: FOS: Mathematics

description: In this paper, we want to control the geometry of some surface subgroups of a cocompact Kleinian group. More precisely, provided any genus-2 quasi-Fuchsian group $Γ$ and cocompact Kleinian group $G$, then for any $K>1$, we will find a surface subgroup $H$ of $G$ that is $K$-quasiconformally conjugate to a finite index subgroup $F<Γ$.
description: 46 pages, 6 figures
On the boundary of the attainable set of the Dirichlet spectrum
Creators: name: Brasco, Lorenzo
name: Nitsch, Carlo
name: Pratelli, Aldo
Publisher: name: arXiv
Year: 2011
Subjects: subject: Optimization and Control (math.OC)
subject: FOS: Mathematics
subject: 35P15, 49R05, 47A75, 35J25

description: Denoting by $\mathcal{E}\subseteq \R^2$ the set of the pairs $(λ_1(Ω),λ_2(Ω))$ for all the open sets $Ω\subseteq\R^N$ with unit measure, and by $Θ\subseteq\R^N$ the union of two disjoint balls of half measure, we give an elementary proof of the fact that $\partial\E$ has horizontal tangent at its lowest point $(λ_1(Θ),λ_2(Θ))$.
description: 7 pages, 3 figures
Pharmacological neuroprotection in cervical spinal cord injury
Creators: name: Lee, Jae Ho
Publisher: name: University of British Columbia
Year: 2010

description: Spinal cord injury (SCI) is a devastating condition that causes paralysis below the level of the injury. To date, there is no convincingly effective treatment. An enormous preclinical and clinical effort is underway to find a treatment, and one approach is to search for pharmacological agents that are already in clinical use (albeit for different indications), but that may also have neuroprotective properties. Examples of such drugs are magnesium, Riluzole (sodium channel blocker), minocycline and statins. While the majority of human SCI occur in the cervical spinal cord, the vast majority of laboratory SCI research employs animal models of thoracic SCI. An important step, therefore, in the preclinical evaluation of novel treatments is to assess their efficacy in a model of cervical SCI. First, I describe the development of a novel unilateral contusive model of cervical SCI with refined biomechanical, functional, and histological parameters using the Infinite Horizon spinal cord injury device. I conducted a series of experiments in which the spinal cord was injured using various impact forces, impact trajectories, and impact locations off the midline. Behavioral deficits were assessed using a variety of forelimb function tests, after which the cords were evaluated histologically. From these series of experiments, I established a new cervical unilateral spinal cord injury contusion model. Next, I evaluated the neuroprotective effects of minocycline and simvastatin in the clinically relevant unilateral cervical contusion model. Minocycline is a commonly prescribed tetracycline antibiotic that is prescribed for acne. Simvastatin is one of many hydroxymethylglutaryl-coenzyme-A reductase inhibitors that lower cholesterol. As both drugs have translational potential and have been reported to have neuroprotective properties in various neurological diseases, I assessed the neuroprotective effects of these drugs using a host of functional and histological assessments. In the end, there were no neurological improvements with minocycline or simvastatin treatment after a cervical contusion injury.
The Association Between Serum COMP Expression and Intra-articular Knee Injury Sustained 3-10 Years Previously in Youth Sport.
Creators: name: Laudon, Jordan
Publisher: name: Graduate Studies
Year: 2016
Subjects: subject: Anthropology--Medical and Forensic
subject: Biostatistics
subject: Microbiology
subject: FOS: Biological sciences
subject: Epidemiology
subject: Osteoarthritis
subject: Post-traumatic Osteoarthritis
subject: Cartilage Oligomeric Matrix Protein
subject: sport
subject: injury

description: Purpose: This research investigates the relationship between knee injury and cartilage oligomeric matrix protein (COMP), a known indicator of joint deterioration in osteoarthritis (OA). Methods: 170 participants were recruited aged 16-26 years (85 with a sport-related intra-articular knee injury 3-10 years ago and 85 age, sex, and sport-matched controls). Serum samples were collected to evaluate COMP levels before and after physical activity. Results: Male participants averaged 15% greater (219.5 ng/ml, 95% CI 11.0–428.0, p = 0.04 serum COMP levels than uninjured controls. Female participants showed no significant elevation (9.8 ng/ml, 95% CI -208.4-227.9, p = 0.93). There were no differences between injured and uninjured participants in change in COMP pre to post exercise. Conclusions: This research demonstrated differences in baseline COMP values between participants based on history of knee injury in males only. Future research into specific knee injuries may yield insights in COMP’s value identifying risk of OA.
The Surgery Unknotting Number of Legendrian Links
Creators: name: Boranda, A. Bianca
name: Traynor, Lisa
name: Yan, Shuning
Publisher: name: arXiv
Year: 2012
Subjects: subject: Symplectic Geometry (math.SG)
subject: Geometric Topology (math.GT)
subject: FOS: Mathematics
subject: 57R17, 57M25, 53D35

description: The surgery unknotting number of a Legendrian link is defined as the minimal number of particular oriented surgeries that are required to convert the link into a Legendrian unknot. Lower bounds for the surgery unknotting number are given in terms of classical invariants of the Legendrian link. The surgery unknotting number is calculated for every Legendrian link that is topologically a twist knot or a torus link and for every positive, Legendrian rational link. In addition, the surgery unknotting number is calculated for every Legendrian knot in the Legendrian knot atlas of Chongchitmate and Ng whose underlying smooth knot has crossing number 7 or less. In all these calculations, as long as the Legendrian link of $j$ components is not topologically a slice knot, its surgery unknotting number is equal to the sum of $(j-1)$ and twice the smooth 4-ball genus of the underlying smooth link.
description: 26 pages, 27 figures