cometadata/datacite-rtg-text-other-reclassification-records huggingface dataset:
On a system of equations arising in viscoelasticity theory of fractional type
Creators: name: Atanackovic, Teodor M.
name: Pilipovic, Stevan
name: Zorica, Dusan
Publisher: name: arXiv
Year: 2012
Subjects: subject: Mathematical Physics (math-ph)
subject: FOS: Physical sciences

description: We study a system of partial differential equations with integer and fractional derivatives arising in the study of forced oscillatory motion of a viscoelastic rod. We propose a new approach considering a quotient of relations appearing in the constitutive equation instead the constitutive equation itself. Both, a rod and a body are assumed to have finite mass. The motion of a body is assumed to be translatory. Existence and uniqueness for the corresponding initial-boundary value problem is proved within the spaces of functions and distributions.
On the Thermodynamics of 5D Black Holes on ALF Gravitational Instantons
Creators: name: Nedkova, Petya
name: Yazadjiev, Stoytcho S.
Publisher: name: arXiv
Year: 2011
Subjects: subject: High Energy Physics - Theory (hep-th)
subject: General Relativity and Quantum Cosmology (gr-qc)
subject: FOS: Physical sciences

description: We investigate the thermodynamical properties of solutions to the 5D Einstein and Einstein-Maxwell-dilaton equations describing static black holes on ALF gravitational instantons. Some general expressions regarding the nut charge and potential are derived, as well as Smarr-like relations. The thermodynamics of two particular solutions representing a static black hole on Taub-Nut and Taub-Bolt instantons are examined in detail. Two dierent approaches for computation of the mass and the tension - the Komar and counterterm method, are applied and compared. A new charged black hole on Taub-Bolt instanton is constructed and investigated.
description: 31 pages, 1 figure; v2: typos corrected, references added
Neutralino-Sbottom Coannihilation in SU(5)
Creators: name: Gogoladze, Ilia
name: Raza, Shabbar
name: Shafi, Qaisar
Publisher: name: arXiv
Year: 2011
Subjects: subject: High Energy Physics - Phenomenology (hep-ph)
subject: FOS: Physical sciences

description: We identify within the SU(5) framework the minimum number of soft supersymmetry breaking parameters which can yield a bottom squrak (sbottom) as the next to lightest supersymmetric particle. We focus in particular on the neutralino-sbottom coannihilation scenario which gives rise to the desired neutralino dark matter relic density. We find solutions in which the sbottom mass is greater than or of order 210 GeV, while the gluino and the first two family squarks are heavier than 1 TeV. Some benchmark points which can be tested at the LHC are presented.
description: 15 pages, 4 figures and 1 table
A Novel Combinatorial Strategy Targeting the EGFR and JAK2/STAT3 Pathways in GBM Brain Tumour Initiating Cells
Creators: name: Jensen, Katharine
Publisher: name: Graduate Studies
Year: 2017
Subjects: subject: Neuroscience
subject: Glioblastoma multiforme
subject: Cancer
subject: Brain Tumour Initiating Cells
subject: EGFR
subject: JAK2/STAT3
subject: Combinatorial Strategy
subject: Molecular Therapeutics

description: Glioblastoma multiforme (GBM) is the most prevalent and aggressive primary adult brain tumour with a median survival of only 15 months. Despite aggressive treatment, long-lasting tumour control cannot be achieved and disease recurrence is inevitable. Brain tumour initiating cells (BTICs) are postulated to be at the root of disease initiation and recurrence, suggesting that BTIC targeting therapies are crucial to establishing tumour control. Resistance of cancer cells to targeted therapies can occur through the activation of compensating signalling pathways. Using a BTIC model of GBM, we identified the activation of signal transducer and activator of transcription (STAT)3 as a compensation mechanism in response to epidermal growth factor receptor (EGFR) inhibition. We showed that concurrent inhibition of EGFR and STAT3 was highly effective in vitro, as it dramatically decreased BTIC viability and neurosphere formation. Combined inhibition of EGFR and STAT3 resulted in the attenuation of both oncogenic signalling pathways. In vivo, systemic administration of the EGFR inhibitor, afatinib, and the JAK2 inhibitor, pacritinib, demonstrated favourable pharmacokinetic and pharmacodynamic properties, displaying blood-brain barrier penetration and on-target activity in orthotopic BTIC xenografts. Overall, these data provide a promising strategy to overcome EGFR inhibitor resistance by targeting two oncogenic pathways in combination.
High cadence measurement of neutral sodium and potassium absorption during the 2009-2011 eclipse of epsilon Aurigae
Creators: name: Leadbeater, R.
name: Buil, C.
name: Garrel, T.
name: Gorodenski, S.
name: Hansen, T.
name: Schanne, L.
name: Stencel, R.
name: Stober, B.
name: Thizy, O.
Publisher: name: arXiv
Year: 2012
Subjects: subject: Solar and Stellar Astrophysics (astro-ph.SR)
subject: FOS: Physical sciences

description: The results of a spectroscopic survey of epsilon Aurigae during eclipse using a network of small telescopes are presented. The spectra have a resolution of 0.35 to 0.65Å and cover the period 2008 to 2012 with a typical interval of 4 days during eclipse. This paper specifically covers variations in the K I 7699Å, Na D and Mg II 4481Å lines. Absorption started increasing in the KI 7699Å line 3 months before the eclipse began photometrically and had not returned to pre eclipse levels by the end of the survey March 2012, 7 months after the brightness had returned to normal outside eclipse levels. The contribution of the eclipsing object to the KI 7699Å line has been isolated and the data show the excess absorption increasing and decreasing in a series of steps during ingress and egress. This is interpreted as an indication of structure within the eclipsing object. The F star is totally obscured by the eclipsing object at the Na D wavelength during eclipse. The radial velocity of the F star and the mean and maximum radial velocity of the eclipsing material in front of the F star at any given time have been isolated and tracked throughout the eclipse. The quasi-periodic variations seen in the F star RV outside eclipse continued during the eclipse. It is hoped that these results can be used to constrain proposed models of the system and its components.
description: 20 pages including 2 tables and 11 figures. Submitted to The Journal of the American Association of Variable Star Observers 14th May 2012
Hypoconcha arcuata Stimpson 1858
Creators: name: Almeida, Alexandre Oliveira De
name: Guerrazzi, Maria Cec Lia
name: Coelho, Petr Ȏ Nio Alves
Publisher: name: Zenodo
Year: 2007
Subjects: Biodiversity
Taxonomy
Animalia
Arthropoda
Malacostraca
Decapoda
Dromiidae
Hypoconcha
Hypoconcha arcuata

description: Hypoconcha arcuata Stimpson, 1858
Material examined (N=2). 1m, 06–07/VI/2000 (MZUESC #636); 1m, 30/X/2004, St. 0 4 (MZUESC #674). Distribution. Western Atlantic – from North Carolina to Florida, Gulf of Mexico, Antilles, Guyanas, and Brazil (from Amapá to São Paulo) (Melo 1996).
Ecological notes. On sand and shell bottoms, from shallow waters to 80 m (Melo 1996). Previous records in Bahia. Joly et al. (1969), Gomes Corrêa (1972), Barreto et al. (1993).
description: Published as part of Almeida, Alexandre Oliveira De, Guerrazzi, Maria Cec Lia & Coelho, Petr Ȏ Nio Alves, 2007, Stomatopod and decapod crustaceans from Camamu Bay, state of Bahia, Brazil, pp. 1-45 in Zootaxa 1553 on page 24, DOI: 10.5281/zenodo.178168
Environmental determinants of threespine stickleback species pair evolution and persistence
Creators: name: Ormond, Chad Indar
Publisher: name: University of British Columbia
Year: 2010

description: Southwestern British Columbia is unique in that it is apparently the only place on Earth with sympatric species pairs of threespine stickleback (Gasterosteus aculeatus). As such, these species pairs are listed as endangered and are protected under Canada’s Species at Risk Act. Historically these species pairs inhabited seven known lakes but their distribution is currently limited to five lakes in three watersheds. Within these lakes stickleback are found in two forms: benthic and limnetic. These species pairs are thought to have originated through a double-invasion process followed by character displacement. While this hypothesis is supported by morphology and genetics it does not take into account the environmental factors needed to support threespine stickleback in two separate microhabitats, which may be essential for their continued persistence. It is conceivable that the divergence and persistence of the threespine stickleback species pairs may be due in part to unique environmental characteristics of the lakes they inhabit, including physical lake characteristics, water chemistry, or biological productivity. Alternatively, divergence and persistence could be due to specific attributes of fish community structure or random colonization events unrelated to lake attributes. To establish this, I measured a number of abiotic (water chemistry, physical lake parameters) and biotic (food resources, macrophyte abundance) variables from both species pair and non-species pair threespine stickleback lakes in order to identify any factors that may discriminate species pair lakes from non-species pair lakes, thereby leading to a clearer understanding of their critical habitat. While I did not find any clear environmental differences between species pair and non-species pair lakes, my study suggests that a major determinant of the existence of stickleback species pairs is the community of fish present in the lakes and that nesting habitat heterogeneity and its influence on pre-mating reproductive barriers may be important to the persistence of these species pairs. My study provides a baseline to monitor the environments for all known species pair lakes and suggests that the fish assemblage in stickleback lakes may affect resource availability as strongly as the limnological attributes of the lakes themselves although predation may also be an important factor in the evolution of these species pairs.
Rural Community Exceptionality: Analyzing Discursive Cultural Identity Formation in the Qualitative Interview
Creators: name: Arntsen, Burke
Publisher: name: Graduate Studies
Year: 2013
Subjects: subject: Canadian Studies
subject: Discursive rural Canadian cultural identity studies

description: Using interview data collected from the case study community of Dinsmore, Saskatchewan, I examine how rural community members, in the context of significant socio-economic change, construct cultural identity within the qualitative interview. Sociological concepts of community and rurality are ultimately culturally evocative and embedded interpretive repertoires, which are discursively employed to achieve multiple personal and cultural identity projects. Therefore, I employ a critical discourse analysis, which analyzes how participants are concurrently being made into particular subjects by discursive practices, while also creating and re-constructing their own meanings of reality via everyday talk. I find participants privilege a very specific construction of ‘smallness’, as in small numbers of people, and ‘small town’, to make selves exceptional when compared to an increasingly urban social context. I argue by solely privileging a demographic construction of community, of vulnerable populations, gives participants the opportunity to construct sympathetic identities positioned as survivors of loss.
Development of a New Parallel Thermal Reservoir Simulator
Creators: name: Zhong, He
Publisher: name: Graduate Studies
Year: 2016
Subjects: subject: Engineering--Petroleum
subject: Thermal simulation
subject: Parallel Computing
subject: Domain decomposition method

description: Thermal reservoir simulation is the most complex of all reservoir simulators and thus the most computationally intensive. With the advent of computer science, today's commodity PC clusters consist of a large number of discrete computer processors distributed across a network. Improving robustness and performance of parallel reservoir simulators on new high performance computing architectures remains a key issue to address. New numerical difficulties and performance problems appear because computing architecture is very sensible to memory distribution and load balance. This project proposes a new domain partition algorithm based on a fully-distributed graph framework. A reservoir is divided into multiple subregions, where connections, defined by geometry and well perforation information, are weighted by transmissibility and well indices. The continuity of fluxes and better load balance are guaranteed. Different strategies with different message passing frequency and accuracy are proposed for high performance computation. The subregion coupling effects are released or distracted into a linear system according to the physical principles. Subregions are coupled dramatically at flooding fronts and high frequency phase-changing regions, which enhances messages passing through processors. An analytical Jacobian calculation method and a variable alignment scheme are developed in this thesis. They have the ability to simulate three-dimensional multi-component three-phase thermal processes, and are capable of determining different property estimation approaches, such as correlations or table interpolations. An automatic time step algorithm, different variable-ordering algorithms and a Gauss elimination technique are implemented to reduce the intensive computation of linear iterations and to speedup the simulation process. The simulator is validated by analytical and numerical experiments, which include the Buckley-Leverett problem and the fourth SPE comparative solution project. The capability of this simulator is demonstrated through cyclic steam stimulation, steam flooding and steam-assisted gravity drainage processes. Three different parallelism strategies are tested in this thesis. A highly scalability implementation is achieved. This efficient, accurate, and parallel thermal simulator is applicable to highly complex reservoir systems.
title: Experiential Learning – подход обучения через опыт
title: Experiential Learning: Learning Approach Through Experience
Creators: name: Иванова, Ольга Алексеевна
Publisher: name: Издательский центр СурГУ
Year: 2019

description: Актуальность исследования обусловлена тем, что большинство людей все еще понимают под обучением формальное обучение в школе, университете и т. п. Однако существует много других возможностей для приобретения знаний и развития навыков в течение жизни. Обучение происходит неизбежно и постоянно, оно больше не может быть разделено на место и время для приобретения знаний, а также место и время для применения приобретенных знаний (рабочее место). Вместо этого обучение можно рассматривать как постоянное и повседневное взаимодействие с другими людьми и с окружающим миром. Пристальное внимание в статье уделено такому подходу в обучении как обучение через опыт (experiential learning), которое необходимо распространять в образовании, особенно корпоративном. Автором приводится систематизация технологий обучения через опыт, даются показатели оценки эффективности данного обучения. Создание систем обучения experiential learning позволяет существенно усовершенствовать экосистемы обучения.
description: The study is relevant since most people still interpret formal education at school, university, etc. as learning. However, there are many other opportunities for acquiring knowledge and developing skills throughout life. Learning is inevitable and constant. Learning can no longer be divided into place and time for acquiring knowledge, and also place and time for applying acquired knowledge (workplace). Instead, learning can be seen as constant and everyday interaction with other people and the world. The article focuses on learning through experience (experiential learning) which must be disseminated in education, especially in a corporate one. The author provides a systematization of learning technologies through experience and its effectiveness indicators. Creating experiential learning systems can significantly improve learning ecosystems.
Floral Anthesis Rate and Pollen Limitation in Delphinium glaucum and their Consequences for Female Fitness
Creators: name: Cameron-Inglis, Hazel
Publisher: name: Graduate Studies
Year: 2016
Subjects: subject: Biostatistics
subject: Botany
subject: Ecology
subject: FOS: Biological sciences
subject: Genetics
subject: Biology--Molecular
subject: Delphinium glaucum
subject: anthesis rate
subject: pollen quantity
subject: pollen quality
subject: pollen limitation
subject: Phenology
subject: outcrossing
subject: microsatellite
subject: display size
subject: autogamy
subject: geitonogamy
subject: Bombus
subject: selfing
subject: plant mating
subject: flower opening
subject: reproductive assurance
subject: COLONY
subject: inflorescence
subject: phenological mismatch

description: Phenological mismatch between plants and their pollinators and/or interspecific competition for pollination can cause insufficient pollen quantity and/or inadequate pollen quality to limit seed production and siring. Inflorescence display size, a dynamic part of pollinator attraction, influences pollinator behaviour and movement. Thus, a rapid increase in display size as plants begin flowering caused by initially rapid flower anthesis should promote recruitment of pollinators to newly flowering individuals and species. Tests of two assumptions of this hypothesis for Delphinium glaucum revealed: 1) declining anthesis rate during a plant’s flowering period is an intrinsic characteristic of inflorescence architecture, rather than a response to internal resource economy; and 2) pollinator limitation early during the flowering period reduced ovule fertilization and elevated autogamous self-mating. These results suggest that rapidly increasing initial display size largely contributed to the quality, rather than the quantity of female mating. Consequences for male outcross success remain to be assessed.
Selective solvation in aqueous mixtures: Interface deformations and instability
Creators: name: Onuki, Akira
name: Araki, Takeaki
Publisher: name: arXiv
Year: 2012
Subjects: subject: Soft Condensed Matter (cond-mat.soft)
subject: Statistical Mechanics (cond-mat.stat-mech)
subject: FOS: Physical sciences

description: We briefly review the effects of selective solvation of ions in aqueous mixtures, where the ion densities and the composition fluctuations are strongly coupled. We then examine the surface tension γof a liquid-liquid interface in the presence of ions. We show that γcan be decreased drastically due to the electrostatic and solvation interactions near the interface. We calculate how the free energy is changed due to small surface undulations in the presence of an electric double layer. A surface instability occurs for negative γ, which can easily be realized for antagonistic ion pairs near the solvent criticality. Three-dimensional simulation shows how the surface instability is induced.
description: 16 pages, 4 figures
Identifying relationships between galactic magnetic fields and the interstellar medium
Creators: name: Van Eck, Cameron Lee
Publisher: name: Graduate Studies
Year: 2012
Subjects: subject: Astronomy and Astrophysics
subject: Magnetic
subject: Galaxy
subject: Interstellar Medium
subject: Dynamo

description: Magnetic fields are present throughout galaxies, permeating the interstellar medium (ISM). However, there is much that is not known about the relationships between these magnetic fields and the other components of the ISM, such as atomic and molecular gas. The goal of my work was to identify relationships between parameters that characterize the magnetic fields in galaxies and parameters that characterize the ISM. For a sample of 20 spiral galaxies, I collected data for these parameters from the published literature. With these data, I was able to identify 5 correlations between magnetic field parameters and ISM parameters, one of which had been previously observed and 4 that have not yet been reported. I was also able to test the predictions of dynamo theory models with the observed magnetic field parameters; I found that only the magnetic helicity balance model was able to predict the observed behaviour.
Thermal rectification in thickness-asymmetric graphene nanoribbons
Creators: name: Zhong, Wei-Rong
name: Huang, Wei-Hao
name: Deng, Xi-Rong
name: Ai, Bao-Quan
Publisher: name: arXiv
Year: 2011
Subjects: subject: Mesoscale and Nanoscale Physics (cond-mat.mes-hall)
subject: FOS: Physical sciences

description: Thermal rectification in thickness asymmetric graphene nanoribbons connecting single-layer with multi-layer graphene is investigated by using classical nonequilibrium molecular dynamics. It is reported that the graphene nanoribbons with thickness-asymmetry have a good thermal rectification. The thermal rectification factor depends on temperature as well as the thickness-ratio of the two-segment. Our results provide a direct evidence that the thermal rectifier can be achieved in a nanostructure crossing two- and three-dimension.
description: 5figures, Accepted by Appl.Phys.Lett
Examining the Effectiveness of Social Intervention in Relation to Resiliency, Social Skills, and Mental Health in Young Adults with High Functioning Autism Spectrum Disorder
Creators: name: Coret, Marian
Publisher: name: Graduate Studies
Year: 2016
Subjects: subject: Psychology--Developmental
subject: Adults
subject: HFASD
subject: Mental Health
subject: Social Skills
subject: Resiliency

description: The present study examined resiliency, mental health, and social skill outcomes in young adults with High Functioning Autism Spectrum Disorder (HFASD) following completion of the Program for the Education and Enrichment of Relational Skills for Young Adults (PEERS-YA; Laugeson & Frankel, 2015). PEERS-YA is a 16-week manualized, evidence based, and caregiver-assisted social skills intervention designed to help young adults with HFASD to develop and maintain relationships. Measures of anxiety, depression, and social skills were examined 16 weeks prior to beginning of the program (T1), one week prior (T2), and one week after completion of PEERS-YA (T3). Additionally, measures of resiliency were examined at T2 and T3. The results indicated significant improvements in parent-reported social skills; however there were no significant improvements in anxiety, depression, resiliency, or self-reported social skills following completion of PEERS-YA.
Emulsion Layer Growth in Asphaltene/Solids-Stabilized Water-in-Oil Emulsions
Creators: name: McGurn, Michaela
Publisher: name: Graduate Studies
Year: 2017
Subjects: subject: Engineering--Chemical
subject: rag layer
subject: emulsion stability
subject: coalescence
subject: asphaltenes
subject: solids

description: The effect of inorganic, coarse solids on emulsion layer stability and growth was investigated. Factors including solids type (kaolin and silica), size, concentration, and wettability were considered. Model asphaltene-stabilized water-in-oil emulsions were prepared from water and organic phase consisting of solids, asphaltenes, heptane, and toluene. In batch experiments, coalescence rates were determined from the change in emulsion height over time as the emulsion coalesced. In continuous experiments, emulsion layer growth was measured for emulsions in a continuous separator. A material balance/coalescence rate based model was developed and fit to the data. Coarse solids at low concentrations destabilized emulsions in batch separations but, above a threshold concentration, solids increased emulsion stability. In continuous separations, even at feed concentrations below the threshold, solids accumulated in the emulsion until the threshold was reached and stable emulsions were formed. The performance of continuous separations cannot be predicted from batch tests.
Challenges and Recommendations for a Research Data Ecosystem to Support Innovations in the FCT Domain
Creators: name: Akhgar, Babak
name: Bayerl, Petra Saskia
Publisher: name: Zenodo
Year: 2023

description: Conducting reliable, innovative, and impact-driven research in the FCT domain paves the way for better national and European security capabilities, thus supporting improved prevention, detection, and investigation of crime and terrorism.
A significant barrier to FCT research is its highly fragmented nature, as well as a distrust amongst stakeholders about the utilisation or provision of data for research. This fragmentation and propensity for lacking trust have detrimental effects on the efficiency of collaborations amongst stakeholders conducting vital FCT research and innovation activities.
There is an urgent need, therefore, to establish a trusted infrastructure to support robust collaborations and high-quality results. A European FCT Research Data Ecosystem (RDE) is one of the proposals to improve current collaborative practices and opportunities.
The aim of an FCT-specific RDE is to enhance specifically large-scale, cross-border research that leads to new innovations as well as mature tools, solutions, and capabilities for Law Enforcement Agencies (LEAs) to tackle known but also emerging threats in terrorism and crime.
This green paper offers initial findings about the core challenges that may hamper the creation and/or uptake of an FTC-specific RDE, as well as suggestions by subject-matter experts on how to overcome such challenges.
Common ground and the city : assumed community in Vancouver fiction and theatre
Creators: name: Banting, Sarah Lynn
Publisher: name: University of British Columbia
Year: 2010

description: This dissertation offers a new approach to an enduring question in literary studies: how do certain genres mediate an experience of “imagined community”? In studies of Canadian literature, texts are frequently analyzed for how they represent place—and how they evoke national, regional, local, or transnational communities by depicting characters’ lives in place. This project shares that interest in place, but rather than asking how place is represented, it asks what audiences are addressed when fiction and theatre performances refer to specific places. Shifting focus onto these works’ address to particular imagined audiences allows me to consider how they mediate their actual audiences’ relationships to specific places and to other local and non-local populations. Taking novels, short stories, and plays set in metropolitan Vancouver as a case study, I analyze narrative address using the tools of linguistic pragmatics, in particular theories of audience design, relevance, and common ground. I then adapt these ideas to the analysis of live performance in conventional theatres. I find a variety of different modes of address implicit in how these works style their references to the city and its landmarks. All of the plays and some of the narratives address audiences who share their knowledge of certain parts of the city. They offer insight into what parts of a city residents imagine sharing with their anonymous fellow city-dwellers, on what social basis they share these extended neighbourhoods, and what are the limits of this “common ground.” Other narrators address audiences for whom the city is unfamiliar territory. Their narratives illuminate the social contexts that connect people across spatial divides and the various interests that, in the narrators’ opinion, distant audiences might have in being introduced to Vancouver. While the written narratives address audiences who have a specific amount of knowledge of Vancouver but might themselves be anywhere, the plays potentially produce a “strong” form of common ground by bringing their audience together at a particular site. I argue that this experience constructs what Arjun Appadurai calls “locality,” thus offering insight into what locality might feel like in a modern Canadian city.
Sounding of the Ionosphere Using the CanX-2 Nano-Satellite and Single-Frequency Radio Occultation Techniques
Creators: name: Swab, Michael
Publisher: name: Graduate Studies
Year: 2015
Subjects: subject: Atmospheric Sciences
subject: FOS: Earth and related environmental sciences
subject: Atmospheric Science
subject: Engineering--Aerospace
subject: occultation
subject: Radio
subject: Ionosphere
subject: electron
subject: Density
subject: CanX-2
subject: nano-satellite
subject: geodetic-grade
subject: COTS

description: The objective of the research presented in this thesis is to show that single-frequency ionospheric electron density profiles can be obtained using GPS radio occultation techniques with commercial, off-the-shelf hardware. The platform used in support of this objective is the CanX-2 nanosatellite. Limitations with respect to the antenna’s field of view and poor signal quality are overcome with the use of the code-minus-carrier observable, TEC calibration and a various smoothing techniques. All techniques are validated through comparison of the corresponding vertical electron density profiles to optimized data assumed to be the best possible representations of the true ionospheric signal. This assumption is substantiated through application of the optimization procedure to raw COSMIC data and comparison to COSMIC published post-processed product. Smoothing of raw CanX-2 code-minus-carrier data was conducted via polynomial fit and a moving-average filter. Both methods fared very well when compared to the optimized data. The radio occultation research performed with CanX-2 represents 2 orders of magnitude decrease in cost over similar work conducted by larger-budget and larger-scope programs.
Automatic stellar spectra parameterisation in the IR CaII triplet region
Creators: name: Kordopatis, G.
name: Recio-Blanco, A.
name: de Laverny, P.
name: Bijaoui, A.
name: Hill, V.
name: Gilmore, G.
name: Wyse, R. F. G.
name: Ordenovic, C.
Publisher: name: arXiv
Year: 2011
Subjects: subject: Instrumentation and Methods for Astrophysics (astro-ph.IM)
subject: FOS: Physical sciences

description: (Abridged) Galactic archaeology aims to determine the evolution of the Galaxy from the chemical and kinematical properties of its stars. The analysis of current large spectroscopic surveys (thousands of stars) and future ones (millions of stars) require automated analysis techniques to obtain robust estimates of the stellar parameters. Several on-going and planned spectroscopic surveys have selected their wavelength region to contain the IR CaII triplet and this paper focuses on the automatic analysis of such spectra. We investigated two algorithms, MATISSE and DEGAS, both of which compare the observed spectrum to a grid of synthetic spectra, but each uses a different mathematical approach for finding the optimum match and hence the best stellar parameters. We identified degeneracies in different regions of the HR diagram: hot dwarfs and giants share the same spectral signatures. Furthermore, the surface gravity of cooler dwarfs is difficult to determine accurately. These effects are intensified when the information decreases (e.g. metal-poor stars or low SNR spectra). Our results show that the local projection method MATISSE is preferred for high SNR spectra, whereas the decision-tree method DEGAS is preferred for noisier spectra. We therefore propose a hybrid approach of both methods and show that sufficiently accurate results for the purposes of galactic archaeology are retrieved down to SNR~20 for typical thin or thick disc stars, and down to SNR~50 for the more metal-poor halo giants. If unappreciated, degeneracies in stellar parameters can introduce biases in derived quantities for target stars such as distances and full space motions. These biases can be minimised using the knowledge gained by thorough testing of the proposed algorithm, which in turn lead to robust automated methods for the coming extensive stellar spectroscopic surveys in the Local Group.
description: 17 pages, 11 figures, accepted for publication in A&A
Evaluación de la producción científica de la Escuela Andaluza de Salud Pública: 2000-2008
Creators: name: Alba-Ruiz, Rubén
Publisher: name: Zenodo
Year: 2010
Subjects: Evaluación Científica
Producción Científica
Indicadores Bibliométricos
Investigación
Salud Pública
Redes de Colaboración
Bases de datos
Software Libre

description: La Evaluación científica tiene como propósito apoyar y orientar la toma de decisiones, tiene por finalidad determinar, de forma sistemática y objetiva, la relevancia, eficiencia, eficacia, pertinencia, progreso y efectos de una actividad en función de los objetivos que pretenden alcanzarse con su realización, incluyendo el análisis de la gestión administrativa y de la ejecución de esa actividad.

El principal objetivo es evaluar la producción científica de la Escuela Andaluza de Salud Pública (EASP) gracias a herramientas de software libre, que puedan ser aplicadas en un proceso de análisis de información, de manera que, al ser integradas en un procedimiento, logren cubrir todas las etapas del proceso de evaluación.

La metodología empleada es la de identificar herramientas de software libre o gratuitas, que puedan ser aplicadas para el análisis de información y evaluación de la producción científica de la institución, y que permiten: automatizar la recuperación de la información, realizar diversos tipos de análisis bibliométricos, visualizar el comportamiento de las variables estudiadas y sus interrelaciones mediante gráficos, mapas y redes, entre otros.

Se concluye con la identificación de un grupo de herramientas de software libre que han sido integradas en un procedimiento de evaluación mediante indicadores bibliométricos para: la captura, el análisis de información y la visualización del  comportamiento de diferentes variables, que son de gran utilidad para generar un nuevo conocimiento para la toma de decisiones de la Escuela Andaluza de Salud Pública.
High pressure structures of disilane and their superconducting properties
Creators: name: Amsler, Maximilian
name: Flores-Livas, José A.
name: Lenosky, Thomas J.
name: Lehtovaara, Lauri
name: Botti, Silvana
name: Marques, Miguel A. L.
name: Goedecker, Stefan
Publisher: name: arXiv
Year: 2011
Subjects: subject: Superconductivity (cond-mat.supr-con)
subject: FOS: Physical sciences

description: A systematic ab initio search for low enthalpy phases of disilane (Si_2H_6) at high pressures was performed based on the minima hopping method. We found a novel metallic phase of disilane with Cmcm symmetry, which is enthalpically more favorable than the recently proposed structures of disilane up to 280 GPa, but revealing compositional instability below 190 GPa. The Cmcm phase has a moderate electron-phonon coupling yielding a superconducting transition temperature T_c of around 20 K at 100 GPa, decreasing to 13 K at 220 GPa. These values are an order of magnitude smaller than previously predicted T_c for disilane, and cast strong doubts on the possibility of high-T_c superconductivity in these systems as well as in other hydrogen-rich compounds under moderate pressure.
Subsynchronous Resonance
Creators: name: Sadeghi, Roozbeh
Publisher: name: Graduate Studies
Year: 2017
Subjects: subject: Engineering--Electronics and Electrical
subject: SSR
subject: oscillations
subject: subsynchronous oscillation
subject: subsynchronous resonance

description: Series capacitors have been extensively used as an effective means of increasing power transfer capability of transmission systems. However, series capacitors may excite the sub-synchronous resonance and tend to amplify the shaft stress during major network transient event. A power system model is successfully designed and simulated to emulate subsynchronous oscillation. This modeling includes hardware and software implementation in the power system lab. In this thesis, a part of the larger effort is to identify, characterize and mitigate low frequency oscillations in power systems.
Processing and Interpretation of Time-Lapse Seismic Data from a Heavy Oil Field, Alberta, Canada
Creators: name: Kelly, Byron Matthew
Publisher: name: Graduate Studies
Year: 2013
Subjects: subject: Geology
subject: FOS: Earth and related environmental sciences
subject: Geophysics
subject: Geophysic
subject: Time-lapse Seismic
subject: Steam Assisted Gravity Drainage

description: The monitoring of a SAGD heavy oil reservoir is commonly executed through time-lapse 3D seismic surveying, focused on identifying areas of steam stimulation by tracking the movement of a steam front, and identifying areas of bypassed reserves. In this thesis, we processed and interpreted a 4D - 3C seismic dataset, identified time-lapse amplitude anomalies and isochron time-delays associated with the injection of high volumes of steam into a McMurray Formation reservoir. Through processing, and the application of a novel calibration procedure, non-production related differences between the baseline and monitor seismic surveys were minimized. Production-related differences were analyzed through a variety of geophysical techniques, and were projected into a map display to delineate the spatial position of the reservoir steam zones. It was interpreted that the observed amplitude anomalies corresponded to steam injection, while concurrent time-delays represent reservoir heating above pre-injection ambient temperatures.
Automatic Inspection of Radio Astronomical Surveys (AIRAS)
Creators: name: Said, Dina Adel
Publisher: name: Graduate Studies
Year: 2016
Subjects: subject: Astronomy and Astrophysics
subject: Computer Science
subject: Pattern Query
subject: Astroinformatics
subject: GALFACTS
subject: Image Segmentation
subject: Pattern Recognition
subject: Graph Mining
subject: Astronomy Graph
subject: Image Thresholding

description: This research investigates the problem of analyzing radio astronomical surveys (RAS) to automatically identify groups of objects forming patterns that astronomers are interested to find. The visual inspection of RAS to find these interesting patterns requires a lot of time and effort to go through thousands of images in RAS. Moreover, the visual process can be infeasible in very crowded and noisy images. To tackle this problem, this research presents AIRAS: the first reported system for the automatic inspection of RAS. AIRAS consists of two main stages; (i) STAGE 1: Object finding where all objects in RAS are found and presented in a graph-based representation called the astronomy graph (AG), and (ii) STAGE 2: Pattern querying and retrieval where astronomers specify the characteristics of interesting patterns in a query form. Afterwards, AIRAS finds patterns matching these characteristics in the AG and presents them to astronomers for further investigation. Astronomers can use AIRAS to detect patterns known to be suspicious (i.e. they consist of false astronomical objects or artifacts). Among these patterns are the hexagonal pattern (HP) and the zigzag pattern (ZP). In the HP, objects form a hexagon shape with an object in the middle, similar to the shape of the front end of the Arecibo telescope horn. In the ZP, objects are aligned in an orientation with the horizontal axis similar to the scanning line of the radio telescope. These two patterns are used as case studies to evaluate AIRAS performance using images from the GALFACTS project; a project carried out at the University of Calgary in cooperation with several research institutes worldwide. The experimental studies show that AIRAS is a promising system that finds patterns in RAS in response to astronomers’ queries with an acceptable accuracy. Additionally, AIRAS can be extended to connect the patterns found with their physical signals to provide more insights about the nature of these patterns.
Environmental Concentrations of Contaminants Affect Morphological and Neuroendocrine Development in Zebrafish
Creators: name: Kinch, Cassandra
Publisher: name: Graduate Studies
Year: 2015
Subjects: subject: Physiology
subject: FOS: Biological sciences
subject: Bisphenol A
subject: Bisphenol S
subject: brain development
subject: neurogenesis
subject: aromatase
subject: androgen receptor
subject: zebrafish
subject: morphology

description: Exposure to environmental contaminants has been linked to developmental and reproductive abnormalities leading to infertility, spontaneous abortion, reduced number of offspring, and metabolic disorders. In addition, there is evidence linking environmental contaminants with endocrine disruptive abilities, resulting in abnormal developmental rate, heart and eye morphology, and behavior that could not be explained by interaction with single hormone receptor pathways. To begin my thesis, I use a whole-organism approach to investigate morphological changes caused by exposure to the environmental contaminants, Bisphenol A (BPA), DEHP, nonylphenol, and fucosterol at concentrations measured in a local water body (Oldman River, AB), individually and in mixture. Here I report that exposure to nanomolar contaminant concentrations results in global developmental changes, abnormal pericardial development, and abnormal head development. These results support the hypothesis that adverse effects of contaminants were not mediated by single hormone receptor signaling. Furthermore, here I show that contaminant effects in mixture can not be consistently predicted by contaminant effects individually, based on an additive model. These findings provide a framework for better understanding of developmental toxicity of environmental contaminants in zebrafish and other vertebrate species. Given the well-established linkage between developmental BPA exposure and endocrine-related physiologies including obesity, cancers and neurodevelopmental disorders such as hyperactivity, in the second part of my thesis, I study the effects of BPA on neuroendocrine development. To start, I evaluate BPA effects on neuronal birth, or neurogenesis, within the hypothalamus, a small but powerful region of the brain linked to hyperactivity. Interestingly, exposure of embryonic zebrafish with the same environmental concentration of BPA and Bisphenol S (BPS), the primary analogue used in BPA-free products, resulted in 180% and 240% increases, respectively, in neurogenesis. Furthermore, restricted BPA and BPS exposure during the neurogenic window caused hyperactive behaviors later in life. Unexpectedly, BPA-mediated precocious neurogenesis was not dependent on predicted estrogen receptors, but relies on androgen receptor-mediated upregulation of aromatase. Given the emerging link between contaminant exposure and effects on early development, these studies open new avenues of research into how environmental contaminants may perturb neurodevelopment and reinforces that effects of environmental contaminants are complex and warrants further study.
Detailed compositional analysis of the heavily polluted DBZ white dwarf SDSS J073842.56+183509.06: A window on planet formation?
Creators: name: Dufour, P.
name: Kilic, M.
name: Fontaine, G.
name: Bergeron, P.
name: Melis, C.
name: Bochanski, J.
Publisher: name: arXiv
Year: 2012
Subjects: subject: Solar and Stellar Astrophysics (astro-ph.SR)
subject: Earth and Planetary Astrophysics (astro-ph.EP)
subject: FOS: Physical sciences

description: We present a new model atmosphere analysis of the most metal contaminated white dwarf known, the DBZ SDSS J073842.56+183509.06. Using new high resolution spectroscopic observations taken with Keck and Magellan, we determine precise atmospheric parameters and measure abundances of 14 elements heavier than helium. We also report new Spitzer mid-infrared photometric data that are used to better constrain the properties of the debris disk orbiting this star. Our detailed analysis, which combines data taken from 7 different observational facilities (GALEX, Gemini, Keck, Magellan, MMT, SDSS and Spitzer) clearly demonstrate that J0738+1835 is accreting large amounts of rocky terrestrial-like material that has been tidally disrupted into a debris disk. We estimate that the body responsible for the photospheric metal contamination was at least as large Ceres, but was much drier, with less than 1% of the mass contained in the form of water ice, indicating that it formed interior to the snow line around its parent star. We also find a correlation between the abundances (relative to Mg and bulk Earth) and the condensation temperature; refractory species are clearly depleted while the more volatile elements are possibly enhanced. This could be the signature of a body that formed in a lower temperature environment than where Earth formed. Alternatively, we could be witnessing the remains of a differentiated body that lost a large part of its outer layers.
description: 16 pages, 17 figures, accepted for publication in The Astrophysical Journal
Cooperative Sensing Algorithm and Machine Learning Technique in Cognitive Radio Network
Creators: name: Lu, Yingqi
Publisher: name: Graduate Studies
Year: 2016
Subjects: subject: Engineering--Electronics and Electrical
subject: Cognitive Radio Network
subject: Machine Learning

description: This thesis investigates spectrum sensing for Cognitive Radio. First, we deal with the hidden node problem and the selection of sensing frequency in a P2P CR system. Different from existing models where TSU executes sensing and transmitting periodically, a novel detecting model is proposed to consider simultaneous sensing and transmitting. At RSU, BER estimation is applied to detect whether a PU is active or not. Simulation results show that i) simultaneous sensing improves spectrum utilization compared with periodical sensing; ii) The BER estimation improves the probability of detection and spectrum utilization. The second challenge related to decision fusion in cooperative sensing. We propose novel schemes based on machine learning and introduced probability vector to improve system performance. Simulation results demonstrate that the new schemes are better than the traditional ones. The probability vector can shorten the training duration and the classification delay compared with energy vector.
Strong Coupling Problem with Time-Varying Sound Speed
Creators: name: Joyce, Austin
name: Khoury, Justin
Publisher: name: arXiv
Year: 2011
Subjects: subject: High Energy Physics - Theory (hep-th)
subject: FOS: Physical sciences

description: For a single scalar field with unit sound speed minimally coupled to Einstein gravity, there are exactly three distinct cosmological solutions which produce a scale invariant spectrum of curvature perturbations in a dynamical attractor background, assuming vacuum initial conditions: slow-roll inflation; a slowly contracting adiabatic ekpyrotic phase, described by a rapidly-varying equation of state; and an adiabatic ekpyrotic phase on a slowly expanding background. Of these three, only inflation remains weakly coupled over a wide range of modes, the other scenarios can produce at most 12 e-folds of scale invariant and gaussian modes. In this paper, we investigate how allowing the speed of sound of fluctuations to evolve in time affects this classification. While in the presence of a variable sound speed there are many more scenarios which are scale invariant at the level of the two-point function, they generically suffer from strong coupling problems similar to those in the canonical case. There is, however, an exceptional case with superluminal sound speed, which suppresses non-gaussianities and somewhat alleviates strong coupling issues. We focus on a particular realization of this limit and show these scenarios are constrained and only able to produce at most 28 e-folds of scale invariant and gaussian perturbations. A similar bound should hold more generally --- the condition results from the combined requirements of matching the observed amplitude of curvature perturbations, demanding that the Hubble parameter remain sub-Planckian and keeping non-gaussianities under control. We therefore conclude that inflation remains the unique scenario, assuming a single degree of freedom on an attractor background, capable of producing arbitrarily many scale invariant modes while remaining weakly coupled. Alternative mechanisms must inevitably be unstable or rely on multiple degrees of freedom.
description: 23 pages, 1 figure, v2: minor edits, version to appear in PRD