cometadata/datacite-rtg-text-other-reclassification-records huggingface dataset:
Information processing of bimanual reaching movements
Creators: name: Blinch, Jarrod Paul George
Publisher: name: University of British Columbia
Year: 2015

description: The information processing of bimanual reaching movements was investigated in this thesis. All of the studies tested symmetric and asymmetric bimanual reaching movements that were made to targets as quickly and accurately as possible. The duration of movement preparation was measured by reaction time (RT). Study one found that bimanual asymmetric movements had longer preparation than bimanual symmetric movements. Donders’ subtraction method was used to isolate this bimanual asymmetric cost to a stage, or stages, of movement preparation that are unique to choice RT tasks; these included target discrimination, response selection, and response programming. Many different movement parameters could cause bimanual asymmetric costs. The results from study two suggested that the relative contribution of three parameters to the asymmetric cost, from most to least important, was movement amplitudes, target locations, and then startling locations. The relationship between unimanual and bimanual movements was tested in the third study by precuing the target for the left arm of a bimanual movement. RT and the start-react effect were used to determine how movement preparation changed. These measures suggested: 1) that the precued movement was not fully programmed but partially programmed before the imperative stimulus, and 2) that the asymmetric cost was caused by increased processing demands on response programming. Overall, the results supported that bimanual movements are not the sum of two unimanual movements; instead; the two arms of a bimanual movement are unified into a functional unit. When one target is precued, this critical unification likely occurs during response programming. Study four used the additive factors method to determine which stages of movement preparation contributed to the asymmetric cost when both targets were cued by the imperative stimulus. The results supported that the asymmetric cost was caused by increased processing demands on response selection. Target discrimination and response programming – contrary to previous hypotheses – did not contribute to the asymmetric cost. The critical process of bimanual unification likely depends on how the task is presented and conceptualised. It occurs during response selection when both targets are cued by the imperative stimulus, and it is deferred to response programming when one target is precued.
Majorana representation of symmetric multiqubit states
Creators: name: Devi, A. R. Usha
name: Sudha
name: Rajagopal, A. K.
Publisher: name: arXiv
Year: 2011
Subjects: subject: Quantum Physics (quant-ph)
subject: FOS: Physical sciences

description: As early as 1932, Majorana had proposed that a pure permutation symmetric state of N spin- 1 2 particles can be represented by N spinors, which correspond geometrically to N points on the Bloch sphere. Several decades after its conception, the Majorana representation has recently attracted a great deal of attention in connection with multiparticle entanglement. A novel use of this represen- tation led to the classification of entanglement families of permutation symmetric qubits - based on the number of distinct spinors and their arrangement in constituting the multiqubit state. An elegant approach to explore how correlation information of the whole pure symmetric state gets imprinted in its parts is developed for specific entanglement classes of symmetric states. More- over, an elegant and simplified method to evaluate geometric measure of entanglement in N-qubit states obeying exchange symmetry has been developed based on the distribution of the constituent Majorana spionors over the unit sphere. Multiparticle entanglement being a key resource in sev- eral quantum information processing tasks, its deeper understanding is essential. In this review, we present a detailed description of the Majorana representation of pure symmetric states and its applicability in investigating various aspects of multiparticle entanglement.
description: 17 pages, No figures
The role of the central limit theorem in discovering sharp rates of convergence to equilibrium for the solution of the Kac equation
Creators: name: Dolera, Emanuele
name: Regazzini, Eugenio
Publisher: name: arXiv
Year: 2010
Subjects: subject: Probability (math.PR)
subject: FOS: Mathematics

description: In Dolera, Gabetta and Regazzini [Ann. Appl. Probab. 19 (2009) 186-201] it is proved that the total variation distance between the solution $f(\cdot,t)$ of Kac's equation and the Gaussian density $(0,σ^2)$ has an upper bound which goes to zero with an exponential rate equal to -1/4 as $t\to+\infty$. In the present paper, we determine a lower bound which decreases exponentially to zero with this same rate, provided that a suitable symmetrized form of $f_0$ has nonzero fourth cumulant $κ_4$. Moreover, we show that upper bounds like $\bar{C}_δe^{-({1/4})t}ρ_δ(t)$ are valid for some $ρ_δ$ vanishing at infinity when $\int_{\mathbb{R}}|v|^{4+δ}f_0(v)\,dv
description: Published in at http://dx.doi.org/10.1214/09-AAP623 the Annals of Applied Probability (http://www.imstat.org/aap/) by the Institute of Mathematical Statistics (http://www.imstat.org)
QCD evolution of naive-time-reversal-odd fragmentation functions
Creators: name: Kang, Zhong-Bo
Publisher: name: arXiv
Year: 2010
Subjects: subject: High Energy Physics - Phenomenology (hep-ph)
subject: FOS: Physical sciences

description: We study QCD evolution equations of the first transverse-momentum-moment of the naive-time-reversal-odd fragmentation functions - the Collins function and the polarizing fragmentation function. We find for the Collins function case that the evolution kernel has a diagonal piece same as that for the transversity fragmentation function, while for the polarizing fragmentation function case this piece is the same as that for the unpolarized fragmentation function. Our results might have important implications in the current global analysis of spin asymmetries.
description: 8 pages,4 figures
Regulation of macrophage migration inhibitory factor expression and its role in stroke and Alzheimer’s disease.
Creators: name: Zhang, Si
Publisher: name: University of British Columbia
Year: 2015

description: As a pleiotropic protein, macrophage migration inhibitory factor (MIF) participates in many cellular activities including inflammatory response, energy metabolism, and apoptosis. Dysregulation of MIF has been associated with chronic inflammatory conditions, and inhibition of its activity has been proposed as a therapeutic strategy. However, MIF gene knockout shows detrimental effects under stress-induced acute conditions such as infection and ischemia/reperfusion (I/R). Compared to a large body of research regarding the role of MIF outside of the central nervous system, limited studies have been carried out to address its role in neurological conditions. Previous studies showed that MIF protects cardiomyocytes from I/R induced detrimental effects. Since strokes are detrimental to neurons in a similar way that heart attacks are to cardiomyocytes, MIF may exert similar effects to protect neurons. Therefore, we aimed to study the regulation of MIF expression and its potential role in strokes. We identified two functional cis-acting NFκB binding elements on the MIF gene promoter and demonstrated that NFκB regulates MIF expression by transcriptional activation of the MIF gene promoter via these two sites. Under hypoxic conditions, MIF gene transcription is reduced by activation of NFκB signaling, which contributes to the down-regulation of MIF expression in the ischemic territory during strokes. We further demonstrated that MIF reduces caspase-3 activation and protects neurons from oxidative stress-induced and I/R-induced apoptosis in vitro. Using a stroke model, we showed that MIF gene knockout results in elevated caspase-3 activation, exacerbates neuronal death, and accelerates infarct development. These results suggest that MIF exhibits neuroprotective effects following a stroke. As stroke increases the risk of developing Alzheimer’s disease (AD), we further evaluated whether MIF could serve as a molecular link between stroke and AD by exploring the expression profile of MIF and its role in AD. We have provided first-hand evidence suggesting that elevation of MIF expression is induced by a pathological increase of Aβ deposits at the late stage of AD, but this effect does not recover its role in mediating normal behavioral functions in AD, because it is sequestered on the Aβ deposits in a loss-of-function fashion.
Single File Diffusion of particles with long ranged interactions: damping and finite size effects
Creators: name: Delfau, Jean-Baptiste
name: Coste, Christophe
name: Saint-Jean, Michel
Publisher: name: arXiv
Year: 2011
Subjects: subject: Statistical Mechanics (cond-mat.stat-mech)
subject: FOS: Physical sciences

description: We study the Single File Diffusion (SFD) of a cyclic chain of particles that cannot cross each other, in a thermal bath, with long ranged interactions, and arbitrary damping. We present simulations that exhibit new behaviors specifically associated to systems of small number of particles and to small damping. In order to understand those results, we present an original analysis based on the decomposition of the particles motion in the normal modes of the chain. Our model explains all dynamic regimes observed in our simulations, and provides convincing estimates of the crossover times between those regimes.
description: 30 pages, 9 figures
title: Die Dynamik des durchhängenden Seiles
title: Dynamics of a sagging cable
titleType: AlternativeTitle
Creators: name: Starossek, Uwe
Publisher: name: TUHH Universitätsbibliothek
Year: 1990
Subjects: subject: 620: Ingenieurwissenschaften
subject: 620

description: Die vorliegende Arbeit gibt einen Überblick über die analytischen Möglichkeiten zur Beurteilung des dynamischen Verhaltens von horizontal oder schräg gespannten Einzelseilen mit gravitationsbedingtem großen oder kleinen Durchhang. Der Schwerpunkt liegt auf der linearen Theorie der freien Schwingungen und, hierauf aufbauend, auf der Berechnung des Antwortverhaltens bei dynamischer Querbelastung oder Schwingungsanregung durch die Aufhängepunkte. Nach einem Exkurs in die nichtlineare Dynamik werden die praktisch relevanten Erregungskräfte behandelt und Beispielrechnungen durchgeführt.
Bio-inspired calcium phosphate/biopolymer nanocomposite fibrous scaffolds for hard tissue regeneration
Creators: name: Chae, Taesik
Publisher: name: University of British Columbia
Year: 2015

description: This study discloses an original process for making calcium phosphate (CaP)/biopolymer nanocomposite fibrous scaffolds by biomimetic in-situ synthesis and electrospinning. Electrospinning (ES) produces non-woven nanofibrous mesh structure with 3D interconnected pores and a high surface area by applying electrostatic force to polymer-based solution. The resulting topography of the scaffolds mimics the natural extracellular matrix of human tissues, with the potential application in tissue engineering, drug delivery, and wound dressing. We have demonstrated that the possibility of inclusion of CaP into biopolymer nanofibers, inspired by mineralized collagen fibrils in bone tissue, makes ES an attractive processing route for preparation of the nanocomposites for bone tissue regeneration. Two different nanocomposite fibers were explored; i) poly(lactic acid) (PLA) with dicalcium phosphate anhydrate (DCPA) and ii) alginate with hydroxyapatite (HAp). In-situ synthesized DCPA in non-aqueous PLA solution were electrospun into self-fused and intra-nano porous networks. Homogeneous dispersion of DCPA nanocrystallites in the PLA nanofibers was induced by controlling the interaction of Ca²+ ions and the carbonyl groups in PLA, providing nucleation sites for DCPA during the in-situ synthesis. It is shown that the nucleation and growth of HAp on electrospun alginate nanofibers was generated at the [–COO‾]–Ca²+–[–COO‾] linkage sites on electrospun alginate nanofibers impregnated with PO₄³‾ ions during cross-linking treatment of alginate. This novel in-situ synthesis developed in this work resulted in the uniform distribution of the CaP nanophases and avoided agglomeration of the inorganic nanoparticles fabricated by the conventional mechanical blending method. Rat calvarial osteoblasts were stably attached and proliferated faster on the CaP/biopolymer nanocomposites fibrous scaffolds than the pure polymer scaffolds, respectively. Mineralized bone-like nodules deposited after 6 weeks of seeding on DCPA/PLA scaffolds. The unique nanofibrous architectures combined with the CaP nanophases were engineered using ES and the novel biomimetic in-situ synthesis. It is anticipated that the nanocomposite systems mimicking the mineralized collagen fibrils in bone tissue could be advantageous in bone tissue regenerative medicine applications.
Surface-plasmon-polariton wave propagation guided by a metal slab in a sculptured nematic thin film
Creators: name: Faryad, Muhammad
name: Lakhtakia, Akhlesh
Publisher: name: arXiv
Year: 2010
Subjects: subject: Optics (physics.optics)
subject: FOS: Physical sciences

description: Surface-plasmon-polariton~(SPP) wave propagation guided by a metal slab in a periodically nonhomogeneous sculptured nematic thin film~(SNTF) was studied theoretically. The morphologically significant planes of the SNTF on both sides of the metal slab could either be aligned or twisted with respect to each other. The canonical boundary-value problem was formulated, solved for SPP-wave propagation, and examined to determine the effect of slab thickness on the multiplicity and the spatial profiles of SPP waves. Decrease in slab thickness was found to result in more intense coupling of two metal/SNTF interfaces. But when the metal slab becomes thicker, the coupling between the two interfaces reduces and SPP waves localize to one of the two interfaces. The greater the coupling between the two metal/SNTF interfaces, the smaller is the phase speed.
description: 17 pages
MENDES, Manuel (Pe.) – Padre Américo: Itinerário Vocacional. Paço de Sousa: Casa do Gaiato, 2014. 366 p. ISBN 978-972-9156-31-1
Creators: name: Araújo, António De Sousa
Publisher: name: Lusitania Sacra
Year: 2014

description: Lusitania Sacra, n. 30 (2014): Catecismo e Liberalismo em Portugal e no México
Decolonizing the Nunavut school system : stories in a river of time
Creators: name: McGregor, Heather Elizabeth
Publisher: name: University of British Columbia
Year: 2015

description: This research explores the recent history of educational change in Nunavut’s public school system, primarily between the years 2000 and 2013. During this time, decision makers mandated that schools deliver programs in accordance with Inuit foundations of knowledge, values and ways of being. I show how new school system initiatives were largely informed by long-term Nunavut educators—Inuit and non-Inuit—as well as Elders and Inuit knowledge holders, whose perspectives reach into the remembered past and towards an imagined future. My inquiry centres in-depth interviews with Cathy McGregor, an educational leader who carries 40 years experience North of 60°, and was responsible for facilitating many recent curriculum, policy, and leadership changes. Cathy is also my mother. Illuminated by her memories and vision, materials developed for the Nunavut school system, and my own research journey, I examine processes of bringing knowledge from and about the past forward in educational change. I describe three sites as demonstrating decolonizing: 1) The role of Inuit Elders in the school system, including full-time Elder Advisors; 2) Processes of curriculum development based on Inuit Qaujimajatuqangit; and, 3) An annual leadership development workshop facilitating history education. Building on these stories of change, I work towards theorizing two concepts, and the relationship between them, in the context of the Nunavut school system: decolonizing and knowing with historical consciousness. I find the sustainability of change in this context is elusive and challenging. Educators are unlikely to reach a stable moment of fulfillment wherein they hold sufficient knowledge of the context, or where the institution of schooling is decolonized. Using the metaphor of a river melting in spring throughout the dissertation, I find it is unsettling to acknowledge that time constantly slips away; that what was done before may no longer be relevant or possible now. However, knowledge from and about the past may serve educators by illustrating that knowing is always conditioned by place, time, identity, and relationships; therefore, knowledge can, and must, be remade. I argue that this warrants practices of continuously and recursively revisiting what is called for in Nunavut schools, to support educational change towards decolonizing.
Gauge Invariance and Lattice Monopoles
Creators: name: Di Giacomo, Adriano
Publisher: name: arXiv
Year: 2010
Subjects: subject: High Energy Physics - Lattice (hep-lat)
subject: FOS: Physical sciences

description: The number and the location of monopoles in Lattice configurations depend on the choice of the gauge, in contrast to the obvious requirement that monopoles, as physical objects, have a gauge-invariant status. It is proved, starting from non-abelian Bianchi identities, that monopoles are indeed gauge-invariant: the technique used to detect them has instead an efficiency which depends on the choice of the abelian projection, in a known and well understood way.
description: Presented at the Conference QCD@WORK10, Martina Franca (Italy) 20-23 June 2010 to appear in the proceedings
Strong stability preserving two-step Runge-Kutta methods
Creators: name: Ketcheson, David I.
name: Gottlieb, Sigal
name: Macdonald, Colin B.
Publisher: name: arXiv
Year: 2011
Subjects: subject: Numerical Analysis (math.NA)
subject: FOS: Mathematics

description: We investigate the strong stability preserving (SSP) property of two-step Runge-Kutta (TSRK) methods. We prove that all SSP TSRK methods belong to a particularly simple subclass of TSRK methods, in which stages from the previous step are not used. We derive simple order conditions for this subclass. Whereas explicit SSP Runge-Kutta methods have order at most four, we prove that explicit SSP TSRK methods have order at most eight. We present TSRK methods of up to eighth order that were found by numerical search. These methods have larger SSP coefficients than any known methods of the same order of accuracy, and may be implemented in a form with relatively modest storage requirements. The usefulness of the TSRK methods is demonstrated through numerical examples, including integration of very high order WENO discretizations.
CytoF data analysis with Bioconductor packages
Creators: name: Anne-Maud Ferreira
name: McKechnie, Julia
name: Beltran, Davis
name: López-Vergès, Sandra
name: Blish, Catherine
name: Holmes, Susan
Publisher: name: F1000 Research Limited
Year: 2020

description: Mass cytometry or Cytometry by Time Of Flight (CyTOF) is used to study cell population variation between different experimental conditions. This technology measures the expression of more than 50 proteins at single cell resolution by using heavy metal isotope labelled antibodies. Although the technology is well established, the CyTOF data analysis field is still expanding. Bioconductor provides a panel of methods and tools designed to analyze this high-throughput data. Using a selection of Bioconductor packages, we have studied the impact of the dengue virus (DENV) on Natural Killers (NK) cells during pediatric and adult infections. The FlowCore package allows importing the data in R. The SingleCellExperiment package provides a core data structure and framework for downstream analysis. Integrated into the CATALYST package, the combination of the flowSOM and ConsensusClusterPlus algorithms allow clustering the cells for cell phenotyping. Using this workflow, we identified different subsets within the NK cells population. With the help of the diffcyt package, we performed differential abundance tests between healthy and DENV positive patients within the pediatric and adult populations. We found that pediatric DENV infection leads to changes in the total NK cell frequency within two NK cells subsets. Next, we used a custom-made package CytoGLMM to identify different proteins within adult and pediatric samples that are predictive of the DENV infection. The results of these analysis suggest that the disease severity in pediatric may be partially explained by a diminution in the NK cell activation.
Sense of place, places of vulnerability : exploring home and resettlement of river-fronting informal settlers using narratives and images
Creators: name: Esser, Gabrielle Rose
Publisher: name: University of British Columbia
Year: 2015

description: Informality of housing, micro economies, and social networks have emerged over the last century as the dominant morphology in large cities and urbanizing rural municipalities. In the Philippines, this phenomenon has been exacerbated by colonial influences on urban design and declining rural agricultural livelihoods. Informality has historically been addressed as a planning problem to be solved with social housing and zoning. This research attempts to capture the subjective, human side of informality using images and narratives to examine place-making processes and place attachment of persons living informally along the Angat River in the peri-urban municipality of Plaridel in Central Luzon, Philippines as well as local service providers and a sample of persons who have been successfully relocated to social housing within Plaridel. This study uses Photovoice and ethnography to characterize how informal settlers, relocated informal settlers and service providers make sense of informal spaces and places and Jubilee Homes social housing site in Plaridel in the context of vulnerability and place-making. Through historical and current policy analysis paired with Photovoice images and personal narratives, this research asserts that decentralizing shifts in policy, such as the Local Shelter Plan, create a window of opportunity for transition into a new policy paradigm of meaningful consultation and planning with informality and informal settlers. Informality has been, and will continue to be a part of reality in Plaridel and other peri-urban satellite municipalities to Metro Manila.
Scattering Lens Resolves sub-100 nm Structures with Visible Light
Creators: name: van Putten, E. G.
name: Akbulut, D.
name: Bertolotti, J.
name: Vos, W. L.
name: Lagendijk, A.
name: Mosk, A. P.
Publisher: name: arXiv
Year: 2011
Subjects: subject: Optics (physics.optics)
subject: FOS: Physical sciences

description: The smallest structures that conventional lenses are able to optically resolve are of the order of 200 nm. We introduce a new type of lens that exploits multiple scattering of light to generate a scanning nano-sized optical focus. With an experimental realization of this lens in gallium phosphide we have succeeded to image gold nanoparticles at 97 nm optical resolution. Our work is the first lens that provides a resolution in the nanometer regime at visible wavelengths.
description: 4 pages, 3 figures
SIMPSON, Duncan – A Igreja Católica e o Estado Novo Salazarista. Lisboa: Edições 70, 2014. 307 p. ISBN 978-972-44-1774-5
Creators: name: Revez, Jorge
Publisher: name: Lusitania Sacra
Year: 2014

description: Lusitania Sacra, n. 30 (2014): Catecismo e Liberalismo em Portugal e no México
Barnes multiple zeta-functions, Ramanujan's formula, and relevant series involving hyperbolic functions
Creators: name: Komori, Yasushi
name: Matsumoto, Kohji
name: Tsumura, Hirofumi
Publisher: name: arXiv
Year: 2010
Subjects: subject: Number Theory (math.NT)
subject: FOS: Mathematics
subject: 11M41, 11B68

description: In the former part of this paper, we give functional equations for Barnes multiple zeta-functions and consider some relevant results. In particular, we show that Ramanujan's classical formula for the Riemann zeta values can be derived from functional equations for Barnes zeta-functions. In the latter half part, we generalize some evaluation formulas of certain series involving hyperbolic functions in terms of Bernoulli polynomials. The original formulas were classically given by Cauchy, Mellin, Ramanujan, and later recovered and formulated by Berndt. From our consideration, we give multiple versions of these known formulas.
description: 16 pages
Ventral hippocampal lesion volume does not predict working memory deficits in the neonatal ventral hippocampal lesion model of schizophrenia
Creators: name: Badiudeen, Mohamed Thariq
Publisher: name: University of British Columbia
Year: 2015

description: The neonatal ventral hippocampal lesion (NVHL) is the most well-characterized neurodevelopmental animal model of schizophrenia. NVHL animals are known to display marked deficits in cognitive flexibility and working memory (WM), which are largely reminiscent of cognitive deficits seen in human patients. Though WM deficits are a well-characterized feature of the NVHL model, our study was the first to use magnetic resonance imaging (MRI), on live rats, to determine the relationship between lesion extent and the WM deficit in a variable delayed non-match to sample (vDNMS) task. Similar to the existing literature, NVHL animals showed a significant deficit in performance when compared to sham operated animals. Interestingly, however, the magnitude of deficit in WM performance in NVHL animals was stable, regardless of delay length. We suggest that this delay-independent WM deficit reflects inefficiency during the encoding stage of WM processes in NVHL animals. Additionally, we found no evidence of a relationship between ventral hippocampal (VH) lesion volume and the magnitude of WM deficit, suggesting that there may be a threshold level of VH damage, beyond which no further WM impairment is produced.
ZEKRI, Mostafa – Antropologia espiritual: a espiritualidade islâmica através da biografia de um mestre sufi. Portimão: ISMAT, 2013. 199 p. ISBN 978-989-97766-4-7
Creators: name: Rosa, Rolando Melo Da
Publisher: name: Lusitania Sacra
Year: 2014

description: Lusitania Sacra, n. 30 (2014): Catecismo e Liberalismo em Portugal e no México
Independently Axiomatizable L_{omega_1,omega} Theories
Creators: name: Hjorth, Greg
name: Souldatos, Ioannis
Publisher: name: arXiv
Year: 2010
Subjects: subject: Logic (math.LO)
subject: FOS: Mathematics
subject: 03C75, 03E15

description: In partial answer to a question posed by Arnie Miller (http://www.math.wisc.edu/~miller/res/problem.pdf) and X. Caicedo, we obtain sufficient conditions for an L_{omega_1,omega} theory to have an independent axiomatization. As a consequence we obtain two corollaries: The first, assuming Vaught's Conjecture, every L_{omega_1,omega} theory in a countable language has an independent axiomatization. The second, this time outright in ZFC, every intersection of a family of Borel sets can be formed as the intersection of a family of independent Borel sets.
description: 16 pages, no figures
Use of compound microlens arrays as a magnifier in near-eye head-up displays
Creators: name: Park, Hongbae Sam
Publisher: name: University of British Columbia
Year: 2015

description: This thesis reports a new approach for making a very compact near-eye display (NED) using two microlens array (MLA) layers. The two MLAs will work in conjunction as a magnifying lens (MLA magnifier). The purpose of the MLA magnifier is to aid the eye accommodate on a display that is positioned within several centimeters from the eye, by generating a virtual image of the display at optical infinity. While there are recently developed techniques for similar purposes such as waveguides [17, 18], and retinal scanning methods [21], using a magnifying lens has been the most exploited avenue for generating a virtual image due to its rather simple, tried-and-true optical properties; near-eye display systems that incorporate a magnifying lens, whether it is a single piece or a compound, has been well-studied since the dawn of head-up displays. However, magnifying lens-based optics is inherently hard to make compact, because as the focal length becomes smaller, the thickness of the lens becomes larger. This thesis presents in detail the method for making a MLA magnifier that retains a thin profile of about 2 mm in thickness with a system focal length of about 6 mm. Thus the total thickness of the MLA magnifier system is around 8 mm (excluding the thickness of the display) in non-folded optics configuration, which is much more compact in comparison to other popular near-eye displays such as Google Glass or Recon Instrument’s Snow HUD goggles having folded optics.
Spatial and temporal patterns of sediment mobility and storage in a small mountain stream
Creators: name: Klinghoffer, Ilana
Publisher: name: University of British Columbia
Year: 2015

description: The study was conducted in East Creek, a headwater gravel-bed channel in the Fraser Valley foothills of the Coastal Mountains of British Columbia. Sediment transport was measured at three spatial scales using two measurement techniques in a study reach containing three unique morphological reaches: rapids, riffle pool, and step pool. At the largest spatial scale, the channel scale, channel stability was assessed between 2003 and 2009 using longitudinal profiles of channel elevation obtained from digital elevation mapping. The longitudinal profiles suggest that East Creek was in a relatively stable state over the six year analysis period, with the majority of erosion and deposition limited to localized fluctuations that varied in magnitude and direction. At the intermediate spatial scale, the reach scale, sediment transport estimates obtained from pit trap and digital elevation mapping data were used to create a sediment budget for the rapids reach and riffle pool sub-reaches of the channel. Using both measurement techniques, erosion and deposition fluctuated and could not be linked to flow regime or sediment supply alone. It is hypothesized that in-stream sediment supply and bed conditioning are important controls on sediment storage, and were used to explain observed fluctuations in erosion and deposition. The magnitude and direction of reach scale sediment storage fluctuations were not consistent across the two measurement techniques; however, elevation mapping estimates were nearly always higher than pit trap estimates. This is likely a result of overpassing of fine material and pit trap inefficiency. At the smallest spatial scale, the unit scale, spatial patterns of sediment transport were assessed across riffles and pools using digital elevation and morphological mapping data. There was increased sediment mobility in pools compared to riffles, which is likely a result of pools containing finer more loosely interacting particles compared to those in riffles. The high resolution unit scale sediment storage data demonstrated conservation of mass and a tight coupling of erosion and deposition in East Creek.
Multi-multifractality and dynamic scaling in stochastic porous lattice
Creators: name: Mitra, Tushar
name: Hassan, Md. Kamrul
Publisher: name: arXiv
Year: 2022
Subjects: subject: Statistical Mechanics (cond-mat.stat-mech)
subject: FOS: Physical sciences

description: In this article, we extend the idea of stochastic dyadic Cantor set to weighted planar stochastic lattice that leads to a stochastic porous lattice. The process starts with an initiator which we choose to be a square of unit area for convenience. We then define a generator that divides the initiator or one of the blocks, picked preferentially with respect to their areas, to divide it either horizontally or vertically into two rectangles of which one of them is removed with probability $q=1-p$. We find that the remaining number of blocks and their mass varies with time as $t^{p}$ and $t^{-q}$ respectively. Analytical solution shows that the dynamics of this process is governed by infinitely many hidden conserved quantities each of which is a multifractal measure with porous structure as it contains missing blocks of various different sizes. The support where these measures are distributed is fractal with fractal dimension $2p$ provided $0
description: 10 pages, 7 captioned figures
Unveiling a two-dimensional electron gas with universal subbands at the surface of SrTiO3
Creators: name: Santander-Syro, A. F.
name: Copie, O.
name: Kondo, T.
name: Fortuna, F.
name: Pailhes, S.
name: Weht, R.
name: Qiu, X. G.
name: Bertran, F.
name: Nicolaou, A.
name: Taleb-Ibrahimi, A.
name: Fevre, P. Le
name: Herranz, G.
name: Bibes, M.
name: Apertet, Y.
name: Lecoeur, P.
name: Rozenberg, M. J.
name: Barthelemy, A.
Publisher: name: arXiv
Year: 2010
Subjects: subject: Materials Science (cond-mat.mtrl-sci)
subject: Quantum Gases (cond-mat.quant-gas)
subject: Strongly Correlated Electrons (cond-mat.str-el)
subject: FOS: Physical sciences

description: Similar to silicon that is the basis of conventional electronics, strontium titanate (SrTiO3) is the bedrock of the emerging field of oxide electronics. SrTiO3 is the preferred template to create exotic two-dimensional (2D) phases of electron matter at oxide interfaces, exhibiting metal-insulator transitions, superconductivity, or large negative magnetoresistance. However, the physical nature of the electronic structure underlying these 2D electron gases (2DEGs) remains elusive, although its determination is crucial to understand their remarkable properties. Here we show, using angle-resolved photoemission spectroscopy (ARPES), that there is a highly metallic universal 2DEG at the vacuum-cleaved surface of SrTiO3, independent of bulk carrier densities over more than seven decades, including the undoped insulating material. This 2DEG is confined within a region of ~5 unit cells with a sheet carrier density of ~0.35 electrons per a^2 (a is the cubic lattice parameter). We unveil a remarkable electronic structure consisting on multiple subbands of heavy and light electrons. The similarity of this 2DEG with those reported in SrTiO3-based heterostructures and field-effect transistors suggests that different forms of electron confinement at the surface of SrTiO3 lead to essentially the same 2DEG. Our discovery provides a model system for the study of the electronic structure of 2DEGs in SrTiO3-based devices, and a novel route to generate 2DEGs at surfaces of transition-metal oxides.
description: 28 pages, 9 figures
RUSSO, Mariagrazia; TRIGUEIROS, António Júlio Limpo (sj) – I Gesuiti dell’Assistenza Lusitana esiliati in Italia (1759-1831). Padova: Libraria Editrice Università di Padova, 2013. 790 p. ISBN 9788867870752
Creators: name: Braga, Isabel Drumond
Publisher: name: Lusitania Sacra
Year: 2014

description: Lusitania Sacra, n. 30 (2014): Catecismo e Liberalismo em Portugal e no México
Contextual momentary assessment of speech-in-noise listening situations among hearing aid users : validity and reliability
Creators: name: Gillen, Lise
Publisher: name: University of British Columbia
Year: 2015

description: Currently, all hearing aid benefit outcome measures rely on retrospective self-report, which can often be inaccurate due to memory decay, recollection biases, and the use of cognitive heuristics. Contextual momentary assessment (CMA) involves repeated collection of real-time data on an individual’s experience in their natural environment; CMAs circumvent the error and bias related to retrospective assessments, making them more ecologically valid for capturing day-to-day variations in experiences. The purpose of the present paper was to answer three research questions: (a) Is CMA capable of facilitating valid and reliable evaluations of subjective listening experiences in lab-controlled acoustic conditions?; (b) Is CMA validity and reliability altered significantly by the timing of the CMA relative to the listening event (Experiment I)?; (c) Is CMA validity and reliability altered by the presence of, or focus on a secondary task (Experiment II)? To address these research questions, this study employed a block-randomized, within-subject design where 12 participants with sensorineural hearing loss were fitted with hearing aid(s), and completed CMA ratings based on listening situations where they performed a sentence repetition task. The study was comprised of two experiments involving three independent variables: (a) speech level; (b) signal-to-noise ratio (SNR); (c) CMA timing (Experiment I), or task focus (Experiment II). CMAs were composed of four rating dimensions: intelligibility, noisiness, listening effort, and loudness. For the listening situations employed in this lab study, the reliability, construct validity, and criterion validity results were as follows: (a) intelligibility ratings were reliable, demonstrated construct validity, and had the strongest correlation with intelligibility scores when the CMA was completed after listening situations where there was no secondary task; (b) noisiness ratings were reliable, demonstrated construct validity, and correlated the strongest with measured background noise intensities when rated while experiencing the listening situation; (c) listening effort ratings were unreliable and had questionable construct validity; (d) loudness ratings were reliable, demonstrated construct validity, and correlated the strongest with measured speech intensities when rated while experiencing the listening situation. Based on these results, CMA ratings of intelligibility, loudness, and noisiness, but not listening effort, show potential to be useful for measuring hearing aid benefit.
Atomistic and coarse-grained simulations of DNA electrostatics
Creators: name: Ghanbarian Alavijeh, Shahzad
Publisher: name: University of British Columbia
Year: 2015

description: This thesis aims to understand the nanoscale effects of water as a structured solvent on the phenomenon of counterion-induced DNA condensation. We present results of molecular dynamics simulations of the electrostatic interaction between two DNA molecules in the presence of divalent counterions in different solvation models. We also develop a coarse-grained implicit solvent model for investigating the dynamics on long time and length scales. In the first project, we investigate the role of the solvation effects on the interaction between like-charged cylindrical rods as simplified model for DNA molecules. We obtain the average force between two parallel charged rods in simulations that differ only by their representation of water as a implicit or explicit solvent, but have otherwise identical parameters. We find that the presence of water molecules changes the structure of the counterions and results in both qualitative and quantitative changes of the force between highly charged polyelectrolytes. In the second project, we explore the importance of the DNA geometry on the electrostatic forces by considering two rigid helical models. The simulation results indicate that the DNA shape is an essential contributor to the interaction. A regime of attractive interaction, which disappeared in the cylindrical model, is recovered in the explicit solvent model in both types of helical models. The results also confirm that the behaviour of the interactions between two DNA molecules in the explicit solvent model are different from the implicit solvent models. In the third project, we develop a coarse-grained (CG) representation of these solvation effects. This CG model is constructed from explicit simulations and significantly reduces the computational expense. Short-ranged corrections are added to the pair-wise interaction potentials in the implicit solvent model such that the structure of counterions in the system is consistent with the results from the explicit solvent simulations. This CG model succeeds in reproducing the like-charge attraction effect between DNA molecules in explicit simulations. In a final project, we apply the CG model developed previously to study three DNA strands in the presence of divalent counterions as a starting point for investigating many-body effects in the mechanism of DNA bundling.
LUÍS, Maria dos Anjos Fernandes – Vivências religiosas e comportamentos sociais: Visitas Pastorais ao concelho da Lourinhã nos séculos XVII e XVIII. Lourinhã: Câmara Municipal, 2014. 229 p. ISBN 978-989-95787-6-0
Creators: name: Martins, João
Publisher: name: Lusitania Sacra
Year: 2014

description: Lusitania Sacra, n. 30 (2014): Catecismo e Liberalismo em Portugal e no México
Higgs production cross-section in a Standard Model with four generations at the LHC
Creators: name: Anastasiou, Charalampos
name: Buehler, Stephan
name: Furlan, Elisabetta
name: Herzog, Franz
name: Lazopoulos, Achilleas
Publisher: name: arXiv
Year: 2011
Subjects: subject: High Energy Physics - Phenomenology (hep-ph)
subject: High Energy Physics - Experiment (hep-ex)
subject: FOS: Physical sciences

description: We present theoretical predictions for the Higgs boson production cross-section via gluon fusion at the LHC in a Standard Model with four generations. We include QCD corrections through NLO retaining the full dependence on the quark masses, and the NNLO corrections in the heavy quark effective theory approximation. We also include electroweak corrections through three loops. Electroweak and bottom-quark contributions are suppressed in comparison to the Standard Model with three generations.
description: 6 pages, 2 Tables, to appear in the proceedings of the XLVIth Rencontres de Moriond session devoted to Electroweak Interactions and Unified Theories
Generalized modelling of flexible machining system with arbitrary tool geometry
Creators: name: Kilic, Zekai Murat
Publisher: name: University of British Columbia
Year: 2015

description: The final shape of mechanical parts is mainly determined through turning, boring, drilling and milling operations. The prediction of the cutting forces, torque, and power of the machining process, and surface errors and vibration marks left on the parts is required to plan the machining operations and achieve shorter production cycle times while avoiding damage on the part, tool and machine. Past research has focused on developing dedicated mathematical models for each machining operation and tool type. However, the tool geometry and configuration of the machining set-up varies widely depending on the part geometry and application. This thesis presents a generalized mathematical model of machining operations carried out using geometrically defined cutting edges. The mechanics of cutting between the tool edge and the work material are modelled to predict the friction and normal forces on the rake face of a single cutting edge. The combined static and dynamic chip thickness is modelled as a function of tool geometry, the kinematics of machining operation and the relative regenerative vibrations between the tool and workpiece. The cutting forces are transformed to process coordinates by considering the orientation of cutting edge and the kinematics of the machining operation, and are applied on the structural dynamics of the machine tool and workpiece by distribution along the cutting tool–workpiece contact zone. The cutting forces, vibrations, chatter stability and surface errors are simultaneously predicted in a semi-discrete time domain. The geometry and force transformation models are unified in a parametric, mathematical model which covers all cutting operations. The application of the proposed model is demonstrated on turning, drilling and milling operations; multifunctional tools that combine drilling-boring and chamfering in one operation; and two parallel face-milling cutters machining a plate from both sides. The proposed mathematical models are experimentally validated by comparing the measured forces, surface errors, vibrations and chatter stability charts against simulations. The thesis shows the first unified, generalized mathematical modelling of metal cutting operations in the literature. The proposed model is expected to widen the application of science-based machining process simulation, planning and optimization methods in the virtual production of parts.
FRANCO, José Eduardo; ABREU, Luís Machado de (coord.) – Para a História das Ordens e Congregações Religiosas em Portugal, na Europa e no Mundo. Prior Velho: Paulinas, 2014. 2 vols. (944+1040 p.) + CD. ISBN 978-989-673-334-6
Creators: name: Romo, Eduardo Javier Alonso
Publisher: name: Lusitania Sacra
Year: 2014

description: Lusitania Sacra, n. 30 (2014): Catecismo e Liberalismo em Portugal e no México
FERNANDES, Isabel Cristina F. (coord.) – As Ordens Militares. Freires, Guerreiros, Cavaleiros. Actas do VI Encontro sobre Ordens Militares. Palmela: Gabinete de Estudos sobre a Ordem de Santiago, 2012. 2 vols. 1119 p. ISBN 978-972-8497-56-9
Creators: name: Jana, Ernesto
Publisher: name: Lusitania Sacra
Year: 2014

description: Lusitania Sacra, n. 30 (2014): Catecismo e Liberalismo em Portugal e no México
LEMOS, Ana – Os Livros de Horas Iluminados do Palácio Nacional de Mafra. Lisboa: Instituto de Estudos Medievais da Univ. Nova; Mafra: Palácio Nacional, 2013. 152 p. ISBN 978-989-97066-7-5
Creators: name: Alves, Herculano
Publisher: name: Lusitania Sacra
Year: 2014

description: Lusitania Sacra, n. 30 (2014): Catecismo e Liberalismo em Portugal e no México
The substance of self-determination : language, culture, archives and sovereignty
Creators: name: Shepard, Michael Andrew Alvarez
Publisher: name: University of British Columbia
Year: 2015

description: Everyday communication in minority languages continues to experience decline around the world, even given efforts to reverse these processes. As language shift progresses the products of language documentation, including the oral histories and the unique cultural information they contain, become increasingly important. Archives are commonly used to store these resources, but the design and functionality of archives often fails to address language community interests in protecting their capacity for self-determination and other core cultural beliefs. I find that most existing language archives examples lack sufficient controls to maintain culturally based sharing protocols, enable contextualization of resources, provide opportunities for local collaboration and support educational dissemination. Lack of capacity to manage use of and access to language resources in an archive can contribute to an erosion of sovereignty for the language community. Partially in response to the cultural incongruence of existing archive options, community-based and participatory archives are on the rise. In this dissertation I critically evaluate the capacity of endangered language archives to operate in concert cultural beliefs, including the maintenance of sovereignty and demonstration of indigeneity. The identification of language ideologies is a useful lens to determine the cultural compatibility of archives and their practices. I present research with people from Indigenous communities in Washington State, Alaska and California. In addition, I describe interviews with managers and directors from international language archives and small community based ones. My research makes use of the Mukurtu CMS archive platform to both test this tool and its applicability for language preservation. Control of language resources enables tribes to reassert their capacity for cultural resource management as part of their self-determination.