cometadata/datacite-rtg-text-other-reclassification-records huggingface dataset:
Entrepreneurship in the Periphery and the Role of Social Networks: A Study of Businesses in Iqaluit, Nunavut
Creators: name: McCluskey, Christopher J
Publisher: name: Université d'Ottawa / University of Ottawa
Year: 2011
Subjects: subject: Business Administration, Entrepreneurship.
subject: Business Administration, Management.

description: The notion of Canada as a cultural mosaic is especially vivid when comparing life in Nunavut to that of the rest of the country. Not only is the predominant Inuit culture unique in many ways, but so too are the geographical characteristics that make Nunavut and the Canadian North so different from many other regions in the country. To gain a better understanding of entrepreneurship in Nunavut, the research explores how entrepreneurs build and use their social networks and the role of brokerage and closure in the entrepreneurial process. Using a qualitative approach of observation and interviews in the field to gather the data, the findings describe how networks are used in business in the North, and support the conclusion that networks are important for the coordination of resources.
Nonlinear analysis of axisymmetric shells.
Creators: name: Shin, Haksik.
Publisher: name: Université d'Ottawa / University of Ottawa
Year: 2000
Subjects: subject: Engineering, Industrial.

description: The present study is concerned with nonlinear analysis of toroidal shells and storage tanks. The study serves to demonstrate the usefulness of the differential quadrature method in this area of computational mechanics. The problem of the response of axisymmetric toroidal shells to uniform external pressure forms the first part of this study. Nonlinear thin shell theory, accounting for large displacements, is employed. The new differential quadrature method is used to obtain numerical results. For validation a bifurcation solution is found using the finite element method. The commercial code ADINA is used for this purpose. Finally the two methods are used to provide results for eight cases of toroidal shells. An axisymmetric analysis of a liquid storage tank with a circular base plate resting on an elastic foundation forms the second part of this study. Nonlinear shell theory is used for the tank wall and base plate, while a linear model is used for the foundation. A convergence study is carried out to determine the appropriate analysis parameters for the method. Partial validation is obtained by comparison with previously published results. These results are compared with finite element method results. Additional results are presented covering a wide range of tank geometric parameters.
title: Fatigue in myasthenia gravis
title: risk factors and impact on quality of life
titleType: Subtitle
Creators: name: Hoffmann, Sarah
name: Ramm, Johanna
name: Grittner, Ulrike
name: Kohler, Siegfried;
name: Siedler, Jana
name: Meisel, Andreas
Publisher: name: Charité - Universitätsmedizin Berlin
Year: 2016
Subjects: subject: 600 Technik, Medizin, angewandte Wissenschaften::610 Medizin und Gesundheit

description: Objectives Emerging evidence suggests that fatigue in myasthenia gravis (MG) is a relevant problem that negatively impacts activities of daily living (ADL). The relationship between fatigue and quality of life (QoL) has never been systematically explored in MG patients. The study aimed to assess the prevalence of fatigue and its relation to ADL and QoL as well as to identify factors associated with fatigue in MG. Material and Methods This was a cross- sectional observational study in patients with confirmed diagnosis of MG independent of disease severity. Prevalence of fatigue was assessed using the Chalder Fatigue Scale (CFQ). Impact of fatigue on ADL and QoL was assessed by the MG activities of daily living profile (MG-ADL) and the MG-specific quality-of-life instrument (MG-QoL), respectively. Association of fatigue with sociodemographics, clinical characteristics of MG, and comorbidities including mood and anxiety disorders as well as sleep disorders was investigated using multivariable logistic regression analyses. Results Overall, 200 MG patients were included. The observed rate of fatigue was 56.1%, of those 70.4% fulfilled the criteria of chronic fatigue (CF) with a duration of ≥6 months. Relevant fatigue was strongly associated to ADL and QoL. Factors associated with relevant fatigue were disease severity and depressive state. Furthermore, positive muscle-specific tyrosine kinase (MuSK) antibody status showed a strong association with relevant fatigue. Conclusions MG patients have a high prevalence of fatigue which negatively impacts ADL and QoL. MG-specific clinical characteristics are related to fatigue and might help to identify MG patients at risk for fatigue.
Cannabinoid Receptors and the Endocannabinoid System: Signaling and Function in the Central Nervous System
Creators: name: Zou, Shenglong
name: Kumar, Ujendra
Publisher: name: Multidisciplinary Digital Publishing Institute
Year: 2019

description: The biological effects of cannabinoids, the major constituents of the ancient medicinal plant Cannabis sativa (marijuana) are mediated by two members of the G-protein coupled receptor family, cannabinoid receptors 1 (CB1R) and 2. The CB1R is the prominent subtype in the central nervous system (CNS) and has drawn great attention as a potential therapeutic avenue in several pathological conditions, including neuropsychological disorders and neurodegenerative diseases. Furthermore, cannabinoids also modulate signal transduction pathways and exert profound effects at peripheral sites. Although cannabinoids have therapeutic potential, their psychoactive effects have largely limited their use in clinical practice. In this review, we briefly summarized our knowledge of cannabinoids and the endocannabinoid system, focusing on the CB1R and the CNS, with emphasis on recent breakthroughs in the field. We aim to define several potential roles of cannabinoid receptors in the modulation of signaling pathways and in association with several pathophysiological conditions. We believe that the therapeutic significance of cannabinoids is masked by the adverse effects and here alternative strategies are discussed to take therapeutic advantage of cannabinoids.
Performance evaluation of multimedia communications systems supported by IEEE 802.6 DQDB MAN.
Creators: name: Vallée, Richard.
Publisher: name: Université d'Ottawa / University of Ottawa
Year: 1990
Subjects: subject: Engineering, Electronics and Electrical.

description: The work of this thesis is concerned about the performance evaluation of multimedia communications systems supported by IEEE 802.6 DQDB MAN (Distributed Queue Dual Buses Metropolitan Area Network). The proposed IEEE 802.6 DQDB MAN standard, more commonly called DQDB, defines a high speed network allowing integration of voice and data over circuit and packet switching networks. Such networks may be particularly useful for multimedia applications within medical environments involving the transfer of voice and high resolution images. Another application of DQDB can be a backbone network interconnecting low-speed LANs (local area networks). Simulation results, based on the development of queueing models by using the QNAP2 (Queue Network Analysis Package) simulation software, show that DQDB performs well in the above mentioned applications. However, since DQDB transfers information over short fixed-length slots, congestion problems related to the slot formatting process are observed under certain system configurations for multimedia applications. In order to reduce these congestion problems, two system improvements are proposed. The first is to consider the use of images compressed according to the technique called the reduced-difference pyramid while the second one is to allocate higher access priority to the gateways in the LANs interconnected by DQDB.
Compartmental models and Hawkes processes : equivalence and computational advantages in epidemiological modelling
Creators: name: Masri, Sarah
Publisher: name: University of British Columbia
Year: 2025

description: Epidemiological modelling is crucial for understanding and responding to the spread of infectious diseases, helping public health officials assess the impact of interventions and inform policy decisions. Some prominent models within this field, such as the SIR and SEIR compartmental models, rely on unobserved measurements and can be computationally intensive. This thesis investigates the equivalence between the stochastic SIR and SEIR compartmental models and the Hawkes process, a self-exciting point process, in the epidemiological setting. The research demonstrates that, under specified conditions, the SIR and SEIR models can be interpreted as special cases of the finite population Hawkes process, offering a unified framework for disease modelling that does not rely on latent measurements. This thesis contributes to the growing body of literature on stochastic epidemic models by providing an alternative approach to complement compartmental models, highlighting how inference under the Hawkes process, when fitting the process to data, is consistent with the parameters associated with the SIR and SEIR models. The findings suggest that the Hawkes process can approximate some compartmental models, offering a promising tool for epidemiological modelling.
title: Enfermedad de Creutzfeld-Jacob: importancia de un diagnóstico precoz y multidisciplinar.
Creators: name: Medina Dominguez, Maria Jose
Publisher: name: Sociedad Española de Radiología Médica
Year: 2012
Subjects: subject: Cerebrospinal fluid
subject: Imaging sequences
subject: MR
subject: Neuroradiology brain

description: Objetivo docente
Revisión del tema
Conclusiones
description: Objetivo docente:
Revisar las características clínicas,
analíticas,
radiológicas y funcionales de la Enfermedad de Creutzfeld-Jacob que nos permitan mediante una aproximación multidisciplinar,
llegar a un diagnóstico...
Advances in AI, cyber systems, and data-driven techniques for large-scale flood mapping
Creators: name: Li, Zhouyayan
Publisher: name: University of Iowa
Year: 2024
Subjects: Deep learning
Floods
GIS
Hydro-informatics
Remote Sensing

description: Floods rank among the most devastating natural disasters, challenging humanity for over a millennium. Recent advancements in physical sciences have significantly enhanced our understanding of flood dynamics, leading to better preparedness and mitigation strategies. However, the rapidly evolving human society, coupled with changing climate and Earth surface conditions, has presented new challenges in flood modeling and mapping. Today, there is a growing demand for flood mapping models to be faster, ideally in real-time or near-real-time, to facilitate timely decision-making and adjustments. Additionally, there is an interest in discerning commonalities and differences in flood patterns across various global regions. While these objectives have been long-standing, it's only recently that they have become attainable, thanks to breakthroughs in cyber technologies, data-driven methodologies, and the significant improvement in data availability, particularly in terms of large-scale remote sensing datasets.This research concentrated on three promising areas to enhance flood mapping methods, aiming for speed, precision, and scalability. In the first phase, I explored the effectiveness of a DEM-based flood model, Height Above Nearest Drainage, and refined the algorithm for greater adaptability and enhanced performance in areas with intricate hydrologic and geospatial characteristics. In the second phase, I examined the influence of physical drivers like precipitation and other factors, including soil moisture and land cover, on Earth conditions, employing cutting-edge deep learning techniques. This led to the successful demonstration of predicting Earth Observation (EO) images at the pixel level by understanding the influence of these variables on Earth surface conditions. So far, most advancements are currently producer-centric, necessitating additional efforts to effectively communicate findings to end-users and decision-makers. Thus, the third and final phase of my research was dedicated to developing accessible, web-based, and cloud applications for extensive online data analysis and visualization in flood mapping. The goal was to offer customizable and user-friendly data and analytic products, catering to a diverse audience with varying needs and levels of expertise.
Multiple wavelength diffractive imaging
Creators: name: Chen, B.
name: Dilanian, R. A.
name: Teichmann, S.
name: Abbey, Brian
name: Peele, Andrew G.
name: Williams, Garth J.
name: Hannaford, Peter
name: Dao, Lap
name: Quiney, H. M.
name: Nugent, K. A.
Publisher: name: Swinburne
Year: 2024

description: We demonstrate coherent diffraction imaging using multiple harmonics from a high-harmonic generation source. An algorithm is presented that builds the known incident spectrum into the reconstruction procedure with the result that the useable flux is increased by more than an order of magnitude. Excellent images are obtained with a resolution of (165 +/- 5) nm and compare very well with images from a scanning electron microscope.
title: Utilidad del Angio TC en la patología de aorta más frecuente en urgencias
Creators: name: Garrido Blázquez, Montserrat
Publisher: name: Sociedad Española de Radiología Médica
Year: 2012
Subjects: subject: Dissection
subject: Aneurysms
subject: CT-Angiography
subject: Arteries / Aorta

description: Objetivo docente
Revisión del tema
Conclusiones
description: Objetivo docente:
Exponer las posibilidades diagnósticas de la patología aórtica urgenteen un hospital de segundo nivel. Describir las causas y hallazgos radiológicos de la patología aórtica urgente más...
Moments and zero density of automorphic L-functions for Maass forms and their symmetric squares
Creators: name: Reynolds, W. Tyler
Publisher: name: University of Iowa
Year: 2022
Subjects: Automorphic Forms
L-Functions
Maass Forms
Zero Density
public abstract

description: The Riemann zeta function, defined as ζ(s) = ?n≥1 1/ns for Re(s) > 1 and endowed with analytic continuation to C and a functional equation, plays an important role in number theory. Two conjectured aspects of the Riemann zeta function are especially important: the Lindel ̈of Hypothesis, which says that ζ(1/2 + it) ≪ tε, and the famous Riemann Hypothesis, which says that all nontrivial zeroes for ζ lie on the critical line Re(s) = 1/2. In this thesis we examine these two aspects for L-functions, which can be thought of as generalizations of the Riemann zeta function.
description: In the present work we study L-functions associated to Maass forms, which are eigenfunctions of the non-Euclidean Laplacian and can be thought of as generalizations of waveforms which are eigenfunctions of the Euclidean Laplacian. In particular, given f and g belonging to orthonormal bases of Hecke-Maass eigenforms for the space of all Maass cusp forms and all even Maass cusp forms, respectively, we study L(Sym2 f × g) in this thesis.
description: Our main result consists in nontrivial bounds for double moments of L(1/2, Sym2 f × g) and associated L-functions on the central critical line. On average these bounds improve on the best known convexity or subconvexity bounds. As applications we prove nontrivial average bounds for the number of nontrivial zeroes in the critical strip but not on the central critical line. These two results constitute work towards, or evidence for, the Lindel ̈of Hypothesis and the Riemann Hypothesis, respectively.
description: In Appendix A a sketch of the similar holomorphic case is also provided.
title: Esclerosis mesial temporal : un diagnóstico factible con RM convencional.
Creators: name: Vacas Rodríguez, María
Publisher: name: Sociedad Española de Radiología Médica
Year: 2012
Subjects: subject: Head and neck
subject: Neuroradiology brain
subject: MR
subject: Seizure disorders

description: Objetivo docente
Revisión del tema
Conclusiones
description: Objetivo docente:
Llevar a cabo un correlación anatomo-radiológica de las estructuras hipocámpicas con el fin de reconocer fácilmente alteración en el volumen,
morfología y disposición de las mismas. Un estudio de RM cerebral estándard más secuencias...
Tabulating 2-string tangles with methods to count and generate them
Creators: name: Bryhtan, Zachary C.
Publisher: name: University of Iowa
Year: 2024
Subjects: Knot Theory
Tabulation
Combinatorics
Topology

description: An $n$-tangle is a ball containing $n$ disjoint properly embedded strings with ends attached to the boundary of a ball, and a possibly non-empty set of interior loops. Tangles were originally defined by Conway and used as building blocks to construct unique knots and links. This allowed him to duplicate and extend the enumeration of knots done by C. N. Little, which originally took 6 years, in "just an afternoon.'' The ends of the strings in a tangle may be allowed to move freely along the boundary ball, or remain fixed in place. This dissertation will focus on 2-tangles and consider both the free boundary and fixed boundary case. 2-Tangles may be separated into two large groups; algebraic tangles, and non-algebraic tangles. There are several fully classified types of algebraic tangles, namely the rational, Montesinos, and generalized Montesinos tangles. The classification of these tangles include description of unique canonical diagrams and minimal crossing diagrams.
description: Using these diagrams, we develop a method for generating rational, Montesinos, and generalized Montesinos tangles with $N$ crossings. For each class of tangle, we consider how the total number of crossings are distributed throughout the diagram. We may then use results from number theory involving compositions and the Fibonacci sequence to encode crossing distributions. Combining our generating methods with the combinatorial properties of compositions, we then develop counting formulae for each of these classified tangles which depend only on the total number of crossings $N$.
description: We finally tabulate algebraic tangles with 6 and 7 crossings which are not rational, Montesinos, or generalized Montesinos. This process uses properties of compositions and knowledge of rational, Montesinos, and generalized Montesinos tangles to identify symmetries of these algebraic tangles to create unique minimal crossing diagrams.
title: Neumoperitoneo hallazgos en radiología simple
Creators: name: Basterrechea Iriarte, Francisco
Publisher: name: Sociedad Española de Radiología Médica
Year: 2012
Subjects: subject: Abdomen
subject: Diagnostic procedure

description: Objetivo docente
Revisión del tema
Conclusiones
description: Objetivo docente:
Enumerar y recordar las principales causas de neumoperitoneo Describir la técnica óptima de radiología simple para el diagnóstico en pacientes con sospecha de neumoperitoneo Revisar los hallazgos radiológicos clásicos de neumoperitoneo en...
3909822.pdf
Creators: name: Levy, Miguel
name: Borovkova, Olga
name: Sheidler, Colin
name: Blasiola, Brandon
name: Karki, Dolendra
name: Jomard, François
name: POPOVA, Olena
name: Keller, Niels
name: Kozhaev, Mikhail
name: Belotelov, Vladimir
Publisher: name: Optica Publishing Group
Year: 2025
Subjects: Uncategorized

description: Supplementary Material
Technology policy and R&D cooperation in a global economy
Creators: name: Mu, Jianping
Publisher: name: Université d'Ottawa / University of Ottawa
Year: 2005
Subjects: subject: Economics, General.

description: This thesis uses an international economic framework to analyze the strategic role that R&D cooperation can play in international competitions. There are two firms located in different countries and competing in output. Each firm can invest in cost-reducing R&D. There are R&D spillovers, meaning that a portion of the research results of each firm leaks out to the other firm. Two basic setups are considered. In the first setup, one of the firms benefits from an R&D subsidy from its government. In the second setup, firms collaborate in R&D. Multi-stage game-theoretic models are adopted, and the equilibrium concept used is subgame perfectness1[36]. The two setups are compared in terms of innovation, profits, and welfare. Moreover, the impact of spillovers on firms' and the government's decisions are considered. It is found that the subsidy declines with spillovers, because spillovers reduce the benefit of the innovation to the domestic firm. The subsidy boosts R&D investment by the domestic firm, because it reduces the net cost of R&D. (Abstract shortened by UMI.) 1Subgame perfectness is a requirement that decisions be rational at every stage of the game.
Opportunities and limitations: A comparative analysis of citizen science and expert recordings for bioacoustic research
Creators: name: Jäckel, Denise
name: Mortega, Kim Geraldine
name: Sturm, Ulrike
name: Brockmeyer, Ulrich
name: Khorramshahi, Omid
name: Voigt-Heucke, Silke Luise
Publisher: name: Humboldt-Universität zu Berlin
Year: 2021
Subjects: subject: 001 Wissen

description: Citizen science is an approach that has become increasingly popular in recent years. Despite this growing popularity, there still is widespread scepticism in the academic world about the validity and quality of data from citizen science projects. And although there might be great potential, citizen science is a rarely used approach in the field of bioacoustics. To better understand the possibilities, but also the limitations, we here evaluated data generated in a citizen science project on nightingale song as a case study. We analysed the quantity and quality of song recordings made in a non-standardized way with a smartphone app by citizen scientists and the standardized recordings made with professional equipment by academic researchers. We made comparisons between the recordings of the two approaches and among the user types of the app to gain insights into the temporal recording patterns, the quantity and quality of the data. To compare the deviation of the acoustic parameters in the recordings with smartphones and professional devices from the original song recordings, we conducted a playback test. Our results showed that depending on the user group, citizen scientists produced many to a lot of recordings of valid quality for further bioacoustic research. Differences between the recordings provided by the citizen and the expert group were mainly caused by the technical quality of the devices used—and to a lesser extent by the citizen scientists themselves. Especially when differences in spectral parameters are to be investigated, our results demonstrate that the use of the same high-quality recording devices and calibrated external microphones would most likely improve data quality. We conclude that many bioacoustic research questions may be carried out with the recordings of citizen scientists. We want to encourage academic researchers to get more involved in participatory projects to harness the potential of citizen science—and to share scientific curiosity and discoveries more directly with society.
Recombination dynamics and screening of the internal electric field in ZnO/ Znx Mg1-x O multiple quantum wells
Creators: name: Hall, Christopher
name: Dao, Lap
name: Koike, K.
name: Sasa, S.
name: Tan, H. H.
name: Inoue, M.
name: Yano, M.
name: Hannaford, Peter
name: Jagadish, C.
name: Davis, Jeffrey
Publisher: name: Swinburne
Year: 2024

description: We investigate the recombination dynamics within screened c-axis ZnO/Zn0.7Mg0.3O quantum wells using time-resolved photoluminescence and femtosecond pump-probe spectroscopy. The relaxation of excited carriers restores the strength of the internal electric field, which we follow, via the decay time constant, as it increases from 180 ns to 5.8 mu s. Pump-probe spectroscopy reveals faster, initial decay times of 160-250 ps, which we attribute to additional recombination mechanisms, that become significant for carrier densities greater than 2x10(12) pairs cm(-2). In addition, the time for screening of the internal electric field to be established is measured to be less than 1 ps. These measurements are followed by a self-consistent calculation which solves the Schroumldinger and Poisson equations for pair densities up to 1x10(13) pairs cm(-2), where there is no further substantial blueshifting of the transition energy with increasing pair density because the electron and hole charge distributions cancel. This calculation fits the measured recombination dynamics and can be used to determine the quantum-well properties at any time following excitation, including carrier densities, transition energies, and recombination lifetimes.
Cognitive-behavioural treatment of insomnia secondary to chronic pain.
Creators: name: Currie, Shawn R.
Publisher: name: Université d'Ottawa / University of Ottawa
Year: 1998
Subjects: subject: Psychology, Behavioral.

description: My subjects with insomnia secondary to chronic pain were assigned randomly to either a cognitive-behavioural therapy (n = 25) or a minimal contact symptom-monitoring/waiting-list control group (n = 25). The therapy consisted of a multicomponent seven-week group intervention aimed at promoting good sleep habits, teaching relaxation skills, and changing negative thoughts about sleep. Subjects in the control group monitored their sleep using a sleep diary for seven weeks; they also received weekly supportive phone calls from a therapist. Treated subjects were significantly more improved than control subjects on measures of sleep onset latency, wake time after sleep onset, sleep efficiency, sleep quality, and nocturnal activity levels (obtained from ambulatory monitors). A small, but significant, decrease in pain levels was also found in the treated subjects, but depression and medication use remained unchanged. At a 3 month follow-up, treated subjects showed good maintenance of most therapeutic gains. These results provide the first evidence from a randomized controlled trial that cognitive-behavioural therapy is an effective treatment for insomnia that is secondary to chronically painful medical conditions.
A Novel Hantavirus of the European Mole, Bruges Virus, Is Involved in Frequent Nova Virus Coinfections
Creators: name: Laenen, Lies
name: Vergote, Valentijn
name: Kafetzopoulou, Liana Eleni
name: Wawina, Tony Bokalanga
name: Vassou, Despoina
name: Cook, Joseph A.
name: Hugot, Jean-Pierre
name: Deboutte, Ward
name: Kang, Hae Ji
name: Witkowski, Peter T.
name: Köppen-Rung, Panja
name: Krüger, Detlev H.
Publisher: name: Charité - Universitätsmedizin Berlin
Year: 2017
Subjects: subject: Bruges orthohantavirus
subject: Bunyavirales
subject: coinfection
subject: Talpa europaea
subject: virus–host interaction
subject: zoonosis
subject: 600 Technik, Medizin, angewandte Wissenschaften::610 Medizin und Gesundheit

description: Hantaviruses are zoonotic viruses with a complex evolutionary history of virus–host coevolution and cross-species transmission. Although hantaviruses have a broad reservoir host range, virus–host relationships were previously thought to be strict, with a single virus species infecting a single host species. Here, we describe Bruges virus, a novel hantavirus harbored by the European mole (Talpa europaea), which is the well-known host of Nova virus. Phylogenetic analyses of all three genomic segments showed tree topology inconsistencies, suggesting that Bruges virus has emerged from cross-species transmission and ancient reassortment events. A high number of coinfections with Bruges and Nova viruses was detected, but no evidence was found for reassortment between these two hantaviruses. These findings highlight the complexity of hantavirus evolution and the importance of further investigation of hantavirus–reservoir relationships.
The performance of the generalized RAKE (G-RAKE) receiver in a WCDMA-HSDPA scenario
Creators: name: Murugesapillai, Navamshan
Publisher: name: Université d'Ottawa / University of Ottawa
Year: 2005
Subjects: subject: Engineering, Electronics and Electrical.

description: The High-Speed Downlink Packet Access (HSDPA) is a packet-based data service for increased data speed over WCDMA downlink. At high-speed data rate, advanced receivers are needed to realize a reasonable bit error performance. This thesis studies the link-level performance of the G-RAKE receiver for the HSDPA and ways to reduce the receiver's complexity. Unlike the conventional RAKE receiver, the G-RAKE receiver suppresses interference caused by frequency-selective fading channels by accounting for coloured noise found in the fingers' output. Thus, G-RAKE optimizes the placement of fingers and the weighting coefficients in the Maximum Likelihood formulation. In this thesis, performance of the G-RAKE is evaluated via simulations for both static and realistic multipath fading channels described in the literature. According to simulations, G-RAKE receiver compensates for the performance loss experienced by RAKE receivers when the user equipment becomes interference limited. In G-RAKE receiver, calculating the weighting coefficients, which involves inverting the channel impairment matrix, is an expensive operation. It is shown that the complexity and processing time of this operation and, hence, of the overall receiver can be reduced with the Conjugate Gradient or Preconditioned Conjugate Gradient methods.
Durotaxis and antidurotaxis droplet motion onto gradient gel-substrates
Creators: name: Kajouri, R.
name: Theodorakis, P. E.
name: Milchev, A.
Publisher: name: arXiv
Year: 2024
Subjects: subject: Fluid Dynamics (physics.flu-dyn)
subject: FOS: Physical sciences

description: The self-sustained motion of fluids on gradient substrates is a spectacular phenomenon, which can be employed and controlled in applications by carefully engineering the substrate properties. Here, we report on a design of a gel substrate with stiffness gradient, which can cause the spontaneous motion of a droplet along (durotaxis) or to the opposite (antidurotaxis) direction of the gradient, depending on the droplet affinity to the substrate. By using extensive molecular dynamics simulations of a coarse-grained model, we find that the mechanisms of the durotaxis and antidurotaxis droplet motion are distinct, require the minimization of the interfacial energy between the droplet and the substrate, and share similarities with those mechanisms previously observed for brush substrates with stiffness gradient. Moreover, durotaxis motion takes place over a wider range of affinities and is generally more efficient (faster motion) than antidurotaxis. Thus, our study points to further possibilities and guidelines for realizing both antidurotaxis and durotaxis motion on the same gradient substrate for applications in microfluidics, energy conservation, and biology.
description: 22 pages, 6 figures
CCHSA accreditation: A catalyst for change and a building block for social capital Case study of a health authority in New Brunswick
Creators: name: Pichoir Drew, Madeleine
Publisher: name: Université d'Ottawa / University of Ottawa
Year: 2005
Subjects: subject: Health Sciences, Health Care Management.

description: As part of a multiple-case study, the objective of this single-case study is to examine the impact of the accreditation process offered by the Canadian Council on Health Services Accreditation (CCHSA) on one health care organization. The main hospital of the organisation selected has been accredited for a little over 50 years. Quantitative and qualitative data was collected for methodological triangulation. Two questionnaires were distributed; interviews and focus groups were conducted on site. A previously developed conceptual framework on the dimensions of change was used for the analysis. Some changes within the organization were traced back to the accreditation process and they were mainly at the organizational level, affecting processes and organizational structures. In addition, the accreditation self-assessment phase offers an opportunity to increase social capital, but the quantity and type acquired depends on the composition of the self-assessment team and the follow-up done after the accreditation survey.
What we do and do not know about women and kidney diseases; questions unanswered and answers unquestioned: reflection on World Kidney Day and International Woman’s Day
Creators: name: Piccoli, Giorgina
name: Alrukhaimi, Mona
name: Liu, Zhi-Hong
name: Zakharova, Elena
name: Levin, A. (Adeera)
Publisher: name: BioMed Central
Year: 2018

description: Chronic Kidney Disease affects approximately 10% of the world’s adult population: it is within the top 20 causes of death worldwide, and its impact on patients and their families can be devastating. World Kidney Day and International Women’s Day in 2018 coincide, thus offering an opportunity to reflect on the importance of women’s health and specifically their kidney health, on the community, and the next generations, as well as to strive to be more curious about the unique aspects of kidney disease in women so that we may apply those learnings more broadly. Girls and women, who make up approximately 50% of the world’s population, are important contributors to society and their families. Gender differences continue to exist around the world in access to education, medical care, and participation in clinical studies. Pregnancy is a unique state for women, offering an opportunity for diagnosis of kidney disease, but also a state where acute and chronic kidney diseases may manifest, and which may impact future generations with respect to kidney health. There are various autoimmune and other conditions that are more likely to impact women with profound consequences for child bearing, and on the fetus. Women have different complications on dialysis than men, and are more likely to be donors than recipients of kidney transplants. In this editorial, we focus on what we do and do not know about women, kidney health, and kidney disease, and what we might learn in the future to improve outcomes worldwide.
Diamond at 800 GPa
Creators: name: Bradley, D. K.
name: Eggert, J. H.
name: Smith, R. F.
name: Prisbrey, S. T.
name: Hicks, Damien
name: Braun, D. G.
name: Biener, J.
name: Hamza, A. V.
name: Rudd, R. E.
name: Collins, G. W.
Publisher: name: Swinburne
Year: 2024

description: A new compression technique, which enables the study of solids into the TPa regime, is described and used to ramp (or quasi-isentropically) compress diamond to a peak pressure of 1400 GPa. Diamond stress versus density data are reported to 800 GPa and suggest that the diamond phase is stable and has significant material strength up to at least this stress level. Data presented here are the highest ramp compression pressures by more than a factor of 5 and the highest-pressure solid equation-of-state data ever reported.
An approach to the stereospecific total synthesis of 5,6-dideoxy-5-amino-hexonic acids and related compounds.
Creators: name: Au-Young, Yum-Kin.
Publisher: name: Université d'Ottawa / University of Ottawa
Year: 1961
Subjects: subject: Chemistry, Organic.

description: An approach to the stereospecific synthesis of polyhydroxy-5-aminohexanoic acids was designed. It was found that 1-chloro-1-nitrosocyclohexane undergoes a Diels-Alder reaction with of methyl sorbate to give one stereoisomer of 3-methyl 3,6-dihydro-1,2-oxazine-6-carboxylic acid methyl ester. A number of derivatives of this latter compound are described. Catalytic hydrogenation afforded one isomer only of 2-hydroxy-5-aminohexanoic acid, a novel amino acid, Hydroxylation of the Diels-Alder adduct (as the N-benzoyl derivative) with osmium tetroxide followed and by hydrolysis and hydrogenation afforded what is tentatively regarded as 5,6-dideoxy-5-aminotalonic acid. Epoxidation of the adduct peroxytrifluoroacetic acid gave a 50:50 mixture of crystalline epoxides which were separated. The configuration of these epoxides was deduced from a study of their reaction with hydriodic acid. Pure stereoisomeric iodohydrins were obtained which were assigned configurations on the basis of their behavior under conditions of methanolysis. Similarly, chlorohydrins were obtained and assigned configurations by analogy with the course of iodohydrin formation. Reaction of the oxides with formic acid followed by methanolysis afforded a single mixture of trans-diols (3,4,5,6-tetrahydro-3-methyl-4,5-dihydroxy-1,2-oxazine-6-carboxylic acid methyl ester), which are useful potential precursors of additional aminosugar-like compounds. Spectroscopic (IR and NMR) properties of several of the compounds are reported. Mechanistic considerations lead to the conclusion that the formation of the starting adduct probably proceeds by way of a two-step process, a course of reaction which is without precedent.
Efficient three-dimensional multi-resolution modeling, segmentation, and segmentation-based mesh compression
Creators: name: Chen, Lijun
Publisher: name: Université d'Ottawa / University of Ottawa
Year: 2005
Subjects: subject: Engineering, Electronics and Electrical.
subject: Computer Science.

description: 3D polygonal models are increasingly being deployed in a wide range of Virtual Reality (VR) applications, including scientific visualization, collaborative design, entertainment, e-commerce, and remote education, etc. These models, produced by the 3D laser scanning systems, are often represented as complex polyhedral meshes with hundreds of thousands or millions of vertices and triangles. Although this representation can achieve high level of realism, these models usually demand a huge amount of storage space and/or transmission bandwidth in the raw data format. Also, a polygonal mesh does not capture a high-level structure, which is useful for managing data in applications, such as object registration, object retrieval and indexing, feature modeling, etc. One way to impose such a high-level description is through mesh segmentation. Therefore, mesh simplification, segmentation and compression have recently been the main areas in 3D mesh processing. In this dissertation, we present an efficient 3D mesh multi-resolution modeling algorithm, which can output arbitrary resolutions of an input model. This algorithm considers edge curvature and neighborhood face area change as the error metrics for the edge collapse operation. Compared with most of the existing simplification algorithms, the proposed method is simple and effective. We also present an efficient and robust neighborhood based algorithm for 3D mesh segmentation. This approach uses discrete Gaussian curvature and concaveness estimation to detect the boundary vertices between the distinct regions of a given mesh. To capture more accurate and relevant geometric information of a vertex on the mesh surface, we enlarge the 1-ring neighborhood to an eXtended Multiple-Ring (XMR) neighborhood. After feature detection, a fast marching watershed method is deployed, followed by an efficient region merging scheme. Simulation results show that this algorithm is efficient and robust to high-resolution models. Finally, we propose a segmentation based mesh compression scheme. Most of the existing 3D mesh coding algorithms compress the model as a whole. Our algorithm separately compresses the partitioned regions that are obtained by the segmentation method described above. The compressed data are put into one stream part by part. Each part is independent of the others. The boundary strips between the different regions are also encoded and appended to the end of the stream. In an inactive or selective application, the users can get the interested parts or the whole object after all the parts and the boundary strips that can connect all the parts together have been received.
Effects of the alkali-silica reaction on unloaded, statically loaded and dynamically loaded reinforced concrete beams.
Creators: name: Monette, Luc Jean-Guy.
Publisher: name: Université d'Ottawa / University of Ottawa
Year: 1998
Subjects: subject: Engineering, Civil.

description: The Alkali-Silica Reaction (ASR) affects many concrete structures throughout the world. Small scale, simply supported, singly reinforced concrete beams made of both reactive and non-reactive aggregate have been tested. Reactive and non-reactive concrete cylinders, resonant frequency prisms and CSA expansion prisms were tested with the beams. The reactive and non-reactive specimens, except for the CSA prisms, were tested for the same duration, submerged in a 1N NaOH solution at a temperature of 38 degrees Celsius to accelerate the ASR. The CSA prisms were stored at 38 degrees Celsius at 100% relative humidity. Both the reactive and non-reactive beams were tested under the following loading regimes for the duration of the experiment: unloaded, statically loaded and dynamically loaded to unfactored service load. The experiment was conducted until an amount expansion had occurred in the reactive specimens. Three general aspects of the experiment were of interest: (a) The effect of loading condition on expansions due to the Alkali-Silica Reaction; (b) The effects ASR on the structural behaviour of the beams various beams; (c) The damage rating indices of the beams and of plain concrete. (Abstract shortened by UMI.)
Facilitating intelligent media space collaboration via RASCAL: The reflectively adaptive synchronous coordination architectural framework.
Creators: name: Robbins, Robert Wayne.
Publisher: name: Université d'Ottawa / University of Ottawa
Year: 2001
Subjects: subject: Computer Science.

description: The increasing connectivity across domestic, commercial and recreational domains has lead to convergence not only in terms of technology, but also in terms of utility and expectation: people wish to work, play and interact together regardless of technological differences and without the need to continuously adapt to the idiosyncrasies of their collaborative tools. This desire to work together across diversity in location, technology, focus and intent creates the need to facilitate systems that are inherently malleable and that not only emphasize system function, but also how the system behaves. Combined with the proliferation and integration of multimedia technologies, these aspects have provided the impetus to realize collaborative multimedia systems that can meet the diverse and abstract needs of the collaborative process as its participants, scenarios and technologies change and evolve. To do so, this work proposes a reflectively adaptive software engineering framework and support architecture to facilitate the construction of collaborative media spaces. Known as RASCAL, the Reflectively Adaptive Synchronous Coordination Architectural framework explicitly separates behaviour from functionality through the use of a meta-level architecture. Such an approach enables the potential development of intelligent, self-adaptive collaborative systems that can modify their internal construction to meet varying user expectations, behavioural patterns and physical resource constraints. The general framework and supporting communication topology are presented along with an overview of a conceptual prototype called MSpace. Potential usage media-based scenarios ranging from business to artistic venues are explored along with a general evaluation of the system in terms of its reflective nature as well as its potential as a collaborative environment. Future work and additional research opportunities conclude with the observation that RASCAL's underlying essence of reflective adaptivity offers the most potential to meet the evolving needs, expectations and complexity that will someday make such an approach to system sign not a luxury but a necessity.
3916237.pdf
Creators: name: Newman, Zachary
name: Maurice, Vincent
name: Drake, Tara
name: Stone, Jordan
name: Briles, Travis
name: Spencer, Daryl
name: Fredrick, Connor
name: Li, Qing
name: Westly, Daron
name: Ilic, Robert
Publisher: name: Optica Publishing Group
Year: 2025
Subjects: Uncategorized

description: Supplementary Text
Essays on local political economy
Creators: name: Ricca, Federico
Publisher: name: University of British Columbia
Year: 2025

description: Chapter 2 investigates how the racial and ethnic demographic composition of U.S. municipalities is priced in the municipal bonds market. Using high-frequency data on municipal bonds issued between 2004 and 2019, I find that cities with higher non-White population shares face higher borrowing costs. This diversity premium holds controlling for maturity structure, credit ratings, income, population trends, and city finances. Causal estimates are obtained using shift-share instruments for Black and Latino population shares. The findings are consistent with discrimination in the primary market for municipal bonds, independent of credit ratings or underwriter influence. Chapter 3 examines the underrepresentation of minority voters in U.S. city councils. Disproportionality in the representation of Minority groups is widespread, but stronger when racial or ethnic minorities are electorally pivotal, a phenomenon we define strategic underrepresentation. For the period 1981-2020, levels of strategic underrepresentation of African American, Asian, and Latino voters in U.S. city politics are substantial and tied to the strategic choice of institutional features like electoral rules, council size, and form of government. We provide causal evidence of the effects of these practices using the U.S. Supreme Court's narrow decision of Shelby County v. Holder (2013). The ruling invalidated Section 4(b) of the Voting Rights Act, which had required preclearance for electoral changes in a specific subset of U.S. jurisdictions, enabling systematic disenfranchisement. Chapter 4 explores voter registration as a potential mechanism behind the underregistration results. We use proprietary data on the universe of registered voters to show evidence of underregistration—the gap between the population share of Minority voters and their share of registered voters—in U.S. cities. This pattern closely matches that of underrepresentation of minorities in city-councils, suggesting that underregistration is a key channel. We then show that the removal of voting rights protection following Shelby County v. Holder (2013) had negative effects on the registration of Minority voters relative to White voters, especially in jurisdictions with above-median population shares of minorities, highlighting the strategic nature of the disenfranchisement efforts.