cometadata/datacite-rtg-text-other-reclassification-records huggingface dataset:
Probabilistic Random Forest improves bioactivity predictions close to the classification threshold by taking into account experimental uncertainty.
Creators: name: Mervin, Lewis H
name: Trapotsi, Maria-Anna
name: Afzal, Avid M
name: Barrett, Ian P
name: Bender, Andreas
name: Engkvist, Ola
Publisher: name: Apollo - University of Cambridge Repository
Year: 2021
Subjects: Uncertainty Estimation
Target Prediction
Applicability Domain
Experimental Error
Probabilistic Random Forest

description: Measurements of protein-ligand interactions have reproducibility limits due to experimental errors. Any model based on such assays will consequentially have such unavoidable errors influencing their performance which should ideally be factored into modelling and output predictions, such as the actual standard deviation of experimental measurements (σ) or the associated comparability of activity values between the aggregated heterogenous activity units (i.e., Ki versus IC50 values) during dataset assimilation. However, experimental errors are usually a neglected aspect of model generation. In order to improve upon the current state-of-the-art, we herein present a novel approach toward predicting protein-ligand interactions using a Probabilistic Random Forest (PRF) classifier. The PRF algorithm was applied toward in silico protein target prediction across ~ 550 tasks from ChEMBL and PubChem. Predictions were evaluated by taking into account various scenarios of experimental standard deviations in both training and test sets and performance was assessed using fivefold stratified shuffled splits for validation. The largest benefit in incorporating the experimental deviation in PRF was observed for data points close to the binary threshold boundary, when such information was not considered in any way in the original RF algorithm. For example, in cases when σ ranged between 0.4-0.6 log units and when ideal probability estimates between 0.4-0.6, the PRF outperformed RF with a median absolute error margin of ~ 17%. In comparison, the baseline RF outperformed PRF for cases with high confidence to belong to the active class (far from the binary decision threshold), although the RF models gave errors smaller than the experimental uncertainty, which could indicate that they were overtrained and/or over-confident. Finally, the PRF models trained with putative inactives decreased the performance compared to PRF models without putative inactives and this could be because putative inactives were not assigned an experimental pXC50 value, and therefore they were considered inactives with a low uncertainty (which in practice might not be true). In conclusion, PRF can be useful for target prediction models in particular for data where class boundaries overlap with the measurement uncertainty, and where a substantial part of the training data is located close to the classification threshold.
Risk minimization in Rts, with application to FFTT timber construction
Creators: name: Larsen, Alfred
Publisher: name: University of British Columbia
Year: 2015

description: The risk posed to a structure from an earthquake may be minimized by changing the design characteristics of the structure to determine the optimal design. A risk measure, the mean value of the cost functions in this thesis, can be determined using reliability methods to construct a loss curve. This formulation includes the effect of uncertainty in all aspects of the cost, including construction and repair given an event. This risk model also requires no prior information to determine the mean cost and does not define a discrete “failure,” instead using a continuum of possible outcomes in determining the mean of the cost functions. The optimization model allows for different search directions and step sizes in the search for the minimum cost, with steepest descent and BFGS search directions currently implemented. These analyses are performed using the Rts software, which has the capability of performing the optimization, risk, and reliability analyses on input structural models. The functionality of risk minimization is demonstrated with two example structures, with the framework provided for a third. The first is an example previously solved in Rt, which confirms functionality of the implementations in Rts. The second model uses an analytical model of a single-storey timber-steel hybrid frame, which utilizes the novel structural “Finding the Forest Through the Trees” (FFTT) design concept that has been proposed in Vancouver and studied at UBC. The minimum mean cost of this structure, subject to the cost functions and structural simplification, was determined by optimizing two decision variables that represent the fundamental geometry of the frame. Optimization of this frame converged to one point throughout many analyses, utilizing both the steepest descent and BFGS search methods. Finally, the framework for a future 6-storey FFTT example was developed. This example is inspired from modern tall timber design concepts, which are discussed in a literature review and demonstrates unique features within Rts, including the deep parameterization and nested model structure.
Etica ed estetica: somaestetica e l'arte di vivere
Creators: name: Shusterman, Richard
Publisher: name: Lebenswelt. Aesthetics and philosophy of experience.
Year: 2013

description: Ethics and aesthetics tend to be sharply distinguished and frequently opposed as rival realms of value. The apparent conflict between them is discomforting for artists and theorists who seek to combine aesthetic values and ethical aims in their work. My article strives to ease this theoretical tension in two ways. First, through a genealogical analysis of the complexity of our concepts of ethics and aesthetics, I argue that, in some of their historical conceptions, they display considerable convergence. Here I appeal both to classical Western and Asian theories of ethics and aesthetics. Second, I show how these notions converge in the pragmatist, somaesthetic notion of an embodied art of living.
description: Lebenswelt. Aesthetics and philosophy of experience., No 3 (2013)
«L’araldo del nuovo Dio». La rimitizzazione di Hölderlin nel circolo di George e le sue conseguenze heideggeriane
Creators: name: Jamme, Christoph
Publisher: name: Lebenswelt. Aesthetics and philosophy of experience.
Year: 2013

description: The article deals with the reception of Hölderlin in the George-circle, especially the editorial and scientific work of Norbert von Hellingrath. At the end the consequences of this approach until our days are discussed especially with Martin Heidegger.
description: Lebenswelt. Aesthetics and philosophy of experience., No 3 (2013)
Sub-nanosecond Electro-optic Modulation of Triggered Single Photons from a Quantum Dot
Creators: name: Rakher, Matthew T.
name: Srinivasan, Kartik
Publisher: name: arXiv
Year: 2011
Subjects: subject: Quantum Physics (quant-ph)
subject: Mesoscale and Nanoscale Physics (cond-mat.mes-hall)
subject: FOS: Physical sciences

description: Control of single photon wave-packets is an important resource for developing hybrid quantum systems which are composed of different physical systems interacting via photons. Here we extend this control to triggered photons emitted by a quantum dot, temporally shaping single photon wave-packets on timescales fast compared to their radiative decay by electro-optic modulation. In particular, telecommunications-band single photons resulting from the recombination of an exciton in a quantum dot with exponentially decaying wave-packets are synchronously modulated to create Gaussian-shaped single photon wave-packets. We explore other pulse-shapes and investigate the feasibility of this technique for increasing the indistinguishability of quantum dot generated single photons.
From Infection to Immunity: Understanding the Response to SARS-CoV2 Through In-Silico Modeling
Creators: name: Castiglione, Filippo
name: Deb, Debashrito
name: Srivastava, Anurag P.
name: Liò, Pietro
name: Liso, Arcangelo
Publisher: name: Apollo - University of Cambridge Repository
Year: 2021
Subjects: subject: Immunology
subject: FOS: Clinical medicine
subject: COVID-19
subject: in-silico modeling
subject: virtual cohort
subject: SARS-CoV-2
subject: immunosenescence

description: Background: Immune system conditions of the patient is a key factor in COVID-19 infection survival. A growing number of studies have focused on immunological determinants to develop better biomarkers for therapies. Aim: Studies of the insurgence of immunity is at the core of both SARS-CoV-2 vaccine development and therapies. This paper attempts to describe the insurgence (and the span) of immunity in COVID-19 at the population level by developing an in-silico model. We simulate the immune response to SARS-CoV-2 and analyze the impact of infecting viral load, affinity to the ACE2 receptor, and age in an artificially infected population on the course of the disease. Methods: We use a stochastic agent-based immune simulation platform to construct a virtual cohort of infected individuals with age-dependent varying degrees of immune competence. We use a parameter set to reproduce known inter-patient variability and general epidemiological statistics. Results: By assuming the viremia at day 30 of the infection to be the proxy for lethality, we reproduce in-silico several clinical observations and identify critical factors in the statistical evolution of the infection. In particular, we evidence the importance of the humoral response over the cytotoxic response and find that the antibody titers measured after day 25 from the infection are a prognostic factor for determining the clinical outcome of the infection. Our modeling framework uses COVID-19 infection to demonstrate the actionable effectiveness of modeling the immune response at individual and population levels. The model developed can explain and interpret observed patterns of infection and makes verifiable temporal predictions. Within the limitations imposed by the simulated environment, this work proposes quantitatively that the great variability observed in the patient outcomes in real life can be the mere result of subtle variability in the infecting viral load and immune competence in the population. In this work, we exemplify how computational modeling of immune response provides an important view to discuss hypothesis and design new experiments, in particular paving the way to further investigations about the duration of vaccine-elicited immunity especially in the view of the blundering effect of immunosenescence.
New AdS solitons and brane worlds with compact extra-dimensions
Creators: name: Kleihaus, Burkhard
name: Kunz, Jutta
name: Radu, Eugen
Publisher: name: arXiv
Year: 2010
Subjects: subject: High Energy Physics - Theory (hep-th)
subject: General Relativity and Quantum Cosmology (gr-qc)
subject: FOS: Physical sciences

description: We construct new static, asymptotically AdS solutions where the conformal infinity is the product of Minkowski spacetime $M_n$ and a sphere $S^m$. Both globally regular, soliton-type solutions and black hole solutions are considered. The black holes can be viewed as natural AdS generalizations of the Schwarzschild black branes in Kaluza-Klein theory. The solitons provide new brane-world models with compact extra-dimensions. Different from the Randall-Sundrum single-brane scenario, a Schwarzschild black hole on the Ricci flat part of these branes does not lead to a naked singularity in the bulk.
description: 28 pages, 4 figures
Due osservazioni sulla metafisica della prescienza
Creators: name: Guardo, Andrea
Publisher: name: Lebenswelt. Aesthetics and philosophy of experience.
Year: 2013

description: The paper discusses two problems concerning the metaphysics of foreknowledge. In the first section I focus on an argument that purports to show that there is no such a thing. In the second one I discuss the relation between the foreknowledge of our own behaviour, or ‘autoforeknowledge’, and what we may call ‘the phenomenology of freedom’. As for the first issue, I employ David Lewis’ discussion of the Grandfather Paradox to argue that the argument in question overlooks a key feature of the semantics of ‘can’. As for the second issue, I develop some remarks by Paul Horwich to show that, contrary appearances notwithstanding, autoforeknowledge is not necessarily incompatible with the phenomenology of freedom.
description: Lebenswelt. Aesthetics and philosophy of experience., No 3 (2013)
Dare il tono ai territori
Creators: name: Thibaud, Jean-Paul
Publisher: name: Lebenswelt. Aesthetics and philosophy of experience.
Year: 2013

description: How are we to conceptualize the changes in contemporary cities on the basis of their ambiances? What about the sensory production of urban territories? What happens when our aim is no longer just to design space but also to install an atmosphere? This paper proposes a hypothesis: we are currently witnessing the ‘setting of ambiance’ in urban spaces. Several ambiance operating modes are identified in order to implement this argument.How are we to conceptualize the changes cities on the basis of their ambiances? What about the sensory production of urban territories? What happens when our aim is no longer just to design space but also to install an atmosphere? This paper proposes a hypothesis: we are currently witnessing the ‘setting of ambiance’ in urban spaces. Several ambiance operating modes are identifying in order to implement this argument.
description: Lebenswelt. Aesthetics and philosophy of experience., No 3 (2013)
Causal inference approaches for dealing with time-dependent confounding in longitudinal studies, with applications to multiple sclerosis research
Creators: name: Karim, Mohammad Ehsanul
Publisher: name: University of British Columbia
Year: 2015

description: Marginal structural Cox models (MSCMs) have gained popularity in analyzing longitudinal data in the presence of 'time-dependent confounding', primarily in the context of HIV/AIDS and related conditions. This thesis is motivated by issues arising in connection with dealing with time-dependent confounding while assessing the effects of beta-interferon drug exposure on disease progression in relapsing-remitting multiple sclerosis (MS) patients in the real-world clinical practice setting. In the context of this chronic, yet fluctuating disease, MSCMs were used to adjust for the time-varying confounders, such as MS relapses, as well as baseline characteristics, through the use of inverse probability weighting (IPW). Using a large cohort of 1,697 relapsing-remitting MS patients in British Columbia, Canada (1995-2008), no strong association between beta-interferon exposure and the hazard of disability progression was found (hazard ratio 1.36, 95% confidence interval 0.95, 1.94). We also investigated whether it is possible to improve the MSCM weight estimation techniques by using statistical learning methods, such as bagging, boosting and support vector machines. Statistical learning methods require fewer assumptions and have been found to estimate propensity scores with better covariate balance. As propensity scores and IPWs in MSCM are functionally related, we also studied the usefulness of statistical learning methods via a series of simulation studies. The IPWs estimated from the boosting approach were associated with less bias and better coverage compared to the IPWs estimated from the conventional logistic regression approach. Additionally, two alternative approaches, prescription time-distribution matching (PTDM) and the sequential Cox approach, proposed in the literature to deal with immortal time bias and time-dependent confounding respectively, were compared via a series of simulations. The PTDM approach was found to be not as effective as the Cox model (with treatment considered as a time-dependent exposure) in minimizing immortal time bias. The sequential Cox approach was, however, found to be an effective method to minimize immortal time bias, but not as effective as a MSCM, in the presence of time-dependent confounding. These methods were used to re-analyze the MS dataset to show their applicability. The findings from the simulation studies were also used to guide the data analyses.
On the importance of the 1-loop finite corrections to seesaw neutrino masses
Creators: name: Sierra, D. Aristizabal
name: Yaguna, Carlos E.
Publisher: name: arXiv
Year: 2011
Subjects: subject: High Energy Physics - Phenomenology (hep-ph)
subject: FOS: Physical sciences

description: In the standard seesaw mechanism, finite corrections to the neutrino mass matrix arise from 1-loop self-energy diagrams mediated by a heavy neutrino. We study in detail these corrections and demonstrate that they can be very significant, exceeding in several cases the tree-level result. We consider the normal and inverted hierarchy spectra for light neutrinos and compute the finite corrections to the different elements of the neutrino mass matrix. Special attention is paid to their dependence with the parameters of the seesaw model. Among the cases in which the corrections can be large, we identify the fine-tuned models considered previously in the literature, where a strong cancellation between the different parameters is required to achieve compatibility with the experimental data. As a particular example, we also analyze how these corrections modify the tribimaximal mixing pattern and find that the deviations may be sizable, in particular for $θ_{13}$. Finally, we emphasize that due to their large size, the finite corrections to neutrino masses have to be taken into account if one wants to properly scan the parameter space of seesaw models.
description: 24 pages, 11 figures
Incorporation policies, identity, and relationships between host societies and immigrants
Creators: name: Breton, Charles
Publisher: name: University of British Columbia
Year: 2015

description: Immigration and the diversity it creates are at the heart of numerous debates in most Western liberal democracies. In order to manage this influx of newcomers, countries have chosen different strategies with different consequences. This dissertation considers the role of these strategies, specifically incorporation policies---policies whose goal is to incorporate immigrants in their new society---in the development of intergroup attitudes. It differs from past research by looking at the relationships between these policies on both hosts' and immigrants' attitudes. In doing so, it also argues for the inclusion of context when studying immigration attitudes and their causes. The central question addressed here is whether some institutional arrangements are more likely to foster relationships between host societies and immigrants where both groups do not feel threatened by the other. This question is answered in three distinct studies each addressing different aspects of it, thus providing a more integrated view of these relationships. The first paper compares immigrant's identification and acculturation orientations among ten immigration countries while the second considers the relationship between incorporation policies and cultural threat among host societies in 17 countries. The third paper focuses on a particular case, Canada, and tests whether diversity and ways of managing it can serve as building blocks for a transformed national identity. Using observational and experimental data from three different datasets, the following studies establish a series of important findings including : (1) there is no difference across policy regimes in ethnic identification, immigrants in every policy regimes tend to identify more with their ethnic group than with the majority; (2) only countries with open incorporation policies are able to foster integrationist attitudes among ethnic identifiers; (3) among host societies, open citizenship policies are associated with less cultural threat but multiculturalism policies are not; (4) citizenship policies also mitigate the effect of threat on anti-immigration attitudes, while more comprehensive multiculturalism policies have the opposite effect; (5) contrary to past research on priming of national identity, raising the salience of Canadian identity does not make Canadian respondents more opposed to immigration, in some instance it even makes them more acceptant of it.
On the speed of biased random walk in translation invariant percolation
Creators: name: Deijfen, Maria
name: Häggström, Olle
Publisher: name: arXiv
Year: 2010
Subjects: subject: Probability (math.PR)
subject: FOS: Mathematics

description: For biased random walk on the infinite cluster in supercritical i.i.d.\ percolation on $\Z^2$, where the bias of the walk is quantified by a parameter $β>1$, it has been conjectured (and partly proved) that there exists a critical value $β_c>1$ such that the walk has positive speed when $ββ_c$. In this paper, biased random walk on the infinite cluster of a certain translation invariant percolation process on $\Z^2$ is considered. The example is shown to exhibit the opposite behavior to what is expected for i.i.d.\ percolation, in the sense that it has a critical value $β_c$ such that, for $ββ_c$, the speed is positive. Hence the monotonicity in $β$ that is part of the conjecture for i.i.d.\ percolation cannot be extended to general translation invariant percolation processes.
MIT bag model inspired partonic transverse momentum distribution for prompt photon production in pp collisions
Creators: name: Diakonos, F. K.
name: Kaplis, N. K.
name: Maintas, X. N.
Publisher: name: arXiv
Year: 2010
Subjects: subject: High Energy Physics - Phenomenology (hep-ph)
subject: FOS: Physical sciences

description: We consider the prompt photon production in pp collisions using, within the framework of perturbative QCD, a non-Gaussian distribution for the transverse momentum distribution of the partons inside the proton. Our description adopts the widely used in the literature factorization of the partonic momentum distribution into longitudinal and transverse components. It is argued that the non-Gaussian distribution of the intrinsic transverse momenta of the partons is dictated by the asymptotic freedom as well as the 3D confinement of the partons in the proton. To make this association more transparent we use the MIT bag model, which plainly incorporates both properties (asymptotic freedom, confinement), in order to determine in a simplified way the partonic transverse momentum distribution. A large set of data from six different experiments have been fitted with this simple description using as a single free parameter the mean partonic transverse momentum . Surprisingly enough, a perfect fit of the experimental data turns out to require values which are compatible with Heisenberg's uncertainty relation for the proton and decrease almost smoothly as a function of the scaled variable z=pT/\sqrt{s}, where pT is the transverse momentum of the final photon and \sqrt{s} is the beam energy in the center of mass frame. Our analysis indicates that asymptotic freedom and 3D confinement may influence significantly the form of the partonic transverse momentum distribution leaving an imprint on the pp\toγ+X cross section.
description: 5 pages, 3 figures
Three essays in health economics : determinants of individual health, medical care use, and treatment
Creators: name: Timmins, Lori L.
Publisher: name: University of British Columbia
Year: 2015

description: This dissertation studies and identifies determinants of individual health. The first chapter analyzes how the supply of medical care affects patient treatment and health outcomes, focusing on how hospitals respond to the loss of a profitable service line. This chapter provides strong evidence that hospital spillovers across service lines are empirically important and that hospitals differentiate treatment by patient payer type. Hospitals practice both revenue augmenting and cost-cutting behavior in other lines of care, targeting specific procedures and payers according to their profitability. Specifically, they increase the number of surgical procedures and perform more marginal surgeries. The effects are concentrated in medical specialties where there are more discretionary surgeries and higher profit margins. Furthermore, hospitals cut back on unprofitable treatment by reducing non-elective admissions and uninsured elective care. Hospitals also increase the intensity of treatment among private payers. The second chapter of this dissertation investigates the demand side of health care, analyzing the role that health insurance plays on primary medical care usage by young American adults. I find office-based physician visits and prescription drugs are not affected by insurance, but dental visits are. There is a small increase in out-of-pocket expenditures caused by insurance loss, concentrated heavily at the top of the distribution. No change in health status or ability to afford care is found. The findings shed light on the expected welfare benefits of recent US health care policies targeting young adults. The final chapter of this dissertation analyzes the extent to which the early childhood environment shapes child health and development outcomes and, specifically, whether universal childcare levels the playing field across children. I analyze the introduction of a universal childcare program in Quebec in 1997, testing its impact on the distribution of child health and development outcomes. I find that there is little heterogeneity in the response to the policy across the distributions of child motor skills and cognitive outcomes. I do, however, find evidence that it led to a reduction in child body weight at the upper end of the distribution.
Generation of hybrid polarization-orbital angular momentum entangled states
Creators: name: Nagali, Eleonora
name: Sciarrino, Fabio
Publisher: name: arXiv
Year: 2011
Subjects: subject: Quantum Physics (quant-ph)
subject: FOS: Physical sciences

description: Hybrid entangled states exhibit entanglement between different degrees of freedom of a particle pair and thus could be useful for asymmetric optical quantum network where the communication channels are characterized by different properties. We report the first experimental realization of hybrid polarization-orbital angular momentum (OAM) entangled states by adopting a spontaneous parametric down conversion source of polarization entangled states and a polarization-OAM transferrer. The generated quantum states have been characterized through quantum state tomography. Finally, the violation of Bell's inequalities with the hybrid two photon system has been observed.
description: 6 pages, 3 figures
MOIRCS Deep Survey. VII: NIR Morphologies of Star-forming Galaxies at Redshift z~1
Creators: name: Konishi, Masahiro
name: Akiyama, Masayuki
name: Kajisawa, Masaru
name: Ichikawa, Takashi
name: Suzuki, Ryuji
name: Tokoku, Chihiro
name: Uchimoto, Yuka Katsuno
name: Yoshikawa, Tomohiro
name: Tanaka, Ichi
name: Onodera, Masato
name: Ouchi, Masami
name: Omata, Koji
name: Nishimura, Tetsuo
name: Yamada, Toru
Publisher: name: arXiv
Year: 2010
Subjects: subject: Cosmology and Nongalactic Astrophysics (astro-ph.CO)
subject: FOS: Physical sciences

description: We investigate rest-frame near-infrared (NIR) morphologies of a sample of 139 galaxies with M_{s} >= 1 x 10^{10} M_{sun} at z=0.8-1.2 in the GOODS-North field using our deep NIR imaging data (MOIRCS Deep Survey, MODS). We focus on Luminous Infrared Galaxies (LIRGs), which dominate high star formation rate (SFR) density at z~1, in the sample identified by cross-correlating with the Spitzer/MIPS 24um source catalog. We perform two-dimensional light profile fitting of the z~1 galaxies in the Ks-band (rest-frame J-band) with a single component Sersic model. We find that at z~1, ~90% of LIRGs have low Sersic indices (n<2.5, similar to disk-like galaxies) in the Ks-band, and those disk-like LIRGs consist of ~60% of the whole disk-like sample above M_{s} >= 3 x 10^{10} M_{sun}. The z~1 disk-like LIRGs are comparable or ~20% small at a maximum in size compared to local disk-like galaxies in the same stellar mass range. If we examine rest-frame UV-optical morphologies using the HST/ACS images, the rest-frame B-band sizes of the z~1 disk-like galaxies are comparable to those of the local disk-like galaxies as reported by previous studies on size evolution of disk-like galaxies in the rest-frame optical band. Measuring color gradients (galaxy sizes as a function of wavelength) of the z~1 and local disk-like galaxies, we find that the z~1 disk-like galaxies have 3-5 times steeper color gradient than the local ones. Our results indicate that (i) more than a half of relatively massive disk-like galaxies at z~1 are in violent star formation epochs observed as LIRGs, and also (ii) most of those LIRGs are constructing their fundamental disk structure vigorously. The high SFR density in the universe at z~1 may be dominated by such star formation in disk region in massive galaxies.
description: 16 pages, 15 figures, accepted for publication in PASJ. Catalog data will be available at http://astr.tohoku.ac.jp/MODS/wiki/index.php soon
Colóquio Internacional “Um poder entre poderes. Nos 900 anos da restauração da Diocese do Porto e da construção do Cabido Portucalense”. Porto, 17 e 18 de outubro de 2014
Creators: name: Silva, Maria João Oliveira E
Publisher: name: Lusitania Sacra
Year: 2016

description: Lusitania Sacra, n. 31 (2015): Vivências Religiosas Femininas Medievais
MARQUES, Tiago Pires (coord.) – Experiências à Deriva. Paixões Religiosas e Psiquiatria na Europa – Séculos XV a XXI. [S.l.]: Cavalo de Ferro, 2013. 403 p. ISBN 978-989-623-167-5
Creators: name: Fernandes, Maria
Publisher: name: Lusitania Sacra
Year: 2016

description: Lusitania Sacra, n. 33 (2016): Mobilidades Medievais: Carreiras, Projetos, Realizações
REDOL, Pedro – Batalha: Viagem a um Mosteiro desaparecido com James Murphy e William Beckford. [S.l.]: CEPAE, [2011], 146 p. ISBN 978-989-8158-93-2
Creators: name: Jana, Ernesto Alves
Publisher: name: Lusitania Sacra
Year: 2016

description: Lusitania Sacra, n. 33 (2016): Mobilidades Medievais: Carreiras, Projetos, Realizações
Comparison of adherence of self-cured adhesive resin cement to lithium disilicate ceramics and ceramic resin composites using fracture mechanics
Creators: name: Mesmar, Samer
Publisher: name: University of British Columbia
Year: 2015

description: Objective : The goal of this study was to apply fracture mechanics methodology to assess the effect of surface preconditioning on the short and long term adherence between a widely used adhesive resin cement (RelyX Ultimate, 3M ESPE) and recently introduced CAD/CAM materials : two ceramic resin composites (Lava Ultimate – 3M ESPE and Enamic – Vita-Zahnfabrik) and a ceramic (IPS e.max – Ivoclar-Vivadent). Materials and Methods : Sixty specimens were prepared from each e.max and Enamic, and 120 specimens were prepared for Lava Ultimate. Ceramic resin composite blocks samples were prepared by wet cutting and grinding. Ceramic samples were prepared using the lost wax procedure and pressing. Enamic and e.max bonding surfaces were treated with hydrofluoric acid. Lava Ultimate received two surface treatments : sandblasting and Rocatec soft. All samples were bonded using an adhesive and resin cement and stored in water at 37°C. After 24h storage, half of the specimens from each group were tested to determine the interfacial KIC using an Instron universal testing machine; the remaining specimens were tested after 60d storage. Scanning electron microscopy fractographic analysis was performed on representative fractured samples from each group to determine the mode of failure. To determine the adhesive resin cement KIC, twenty specimens were prepared using a mold. Half of the specimens were tested after 24h storage in water at 37°C and the other half were tested after 60d storage. The KIC results were analyzed using two-way ANOVA followed by Scheffé multiple means comparisons. Results : Lava Ultimate had a significantly higher interfacial KIC at 24h when compared to Enamic and e.max. For Lava Ultimate, crack propagation occurred cohesively through the adhesive resin cement. In Enamic and e.max samples, crack propagation occurred cohesively within the adhesive layer. Only Enamic showed a significantly higher interfacial KIC at 60d, compared to the other groups. Lava Ultimate and e.max interfacial KIC, and cement KIC showed lower values at 60d. Conclusion : For Lava Ultimate, surface silicatisation seems to be a more effective surface treatment compared to only sandblasting. For Enamic and e.max, the application of silane coupling agent and adhesive contained in one solution does not seem to be effective.
Radiative properties of highly magnetized isolated neutron star surfaces and approximate treatment of absorption features in their spectra
Creators: name: Suleimanov, V.
name: Hambaryan, V. V.
name: Potekhin, A. Y.
name: van Adelsberg, M.
name: Neuhaeuser, R.
name: Werner, K.
Publisher: name: arXiv
Year: 2010
Subjects: subject: High Energy Astrophysical Phenomena (astro-ph.HE)
subject: FOS: Physical sciences

description: In the X-ray spectra of most X-ray dim isolated neutron stars (XDINSs) absorption features with equivalent widths (EWs) of 50 -- 200 eV are observed. We theoretically investigate different models to explain absorption features and compare their properties with the observations. We consider various theoretical models for the magnetized neutron star surface: naked condensed iron surfaces and partially ionized hydrogen model atmospheres, including semi-infinite and thin atmospheres above a condensed surface. The properties of the absorption features (especially equivalent widths) and the angular distributions of the emergent radiation are described for all models. A code for computing light curves and integral emergent spectra of magnetized neutron stars is developed. We assume a dipole surface magnetic field distribution with a possible toroidal component and corresponding temperature distribution. A model with two uniform hot spots at the magnetic poles can also be employed. Light curves and spectra of highly magnetized neutron stars with parameters typical for XDINSs are computed using different surface temperature distributions and various local surface models. Spectra of magnetized model atmospheres are approximated by diluted blackbody spectra with one or two Gaussian lines having parameters, which allow us to describe the model absorption features. To explain the prominent absorption features in the soft X-ray spectra of XDINSs a thin atmosphere above the condensed surface can be invoked, whereas a strong toroidal magnetic field component on the XDINS surfaces can be excluded.
description: 54 pages, 17 figures, accepted for publication in A&A
Study of the interplay between magnetic shear and resonances using Hamiltonian models for the magnetic field lines
Creators: name: Firpo, Marie-Christine
name: Constantinescu, Dana
Publisher: name: arXiv
Year: 2011
Subjects: subject: Plasma Physics (physics.plasm-ph)
subject: FOS: Physical sciences

description: The issue of magnetic confinement in magnetic fusion devices is addressed within a purely magnetic approach. Using some Hamiltonian models for the magnetic field lines, the dual impact of low magnetic shear is shown in a unified way. Away from resonances, it induces a drastic enhancement of magnetic confinement that favors robust internal transport barriers (ITBs) and stochastic transport reduction. When low-shear occurs for values of the winding of the magnetic field lines close to low-order rationals, the amplitude thresholds of the resonant modes that break internal transport barriers by allowing a radial stochastic transport of the magnetic field lines may be quite low. The approach can be applied to assess the robustness versus magnetic perturbations of general (almost) integrable magnetic steady states, including non-axisymmetric ones such as the important single helicity steady states. This analysis puts a constraint on the tolerable mode amplitudes compatible with ITBs and may be proposed as a possible explanation of diverse experimental and numerical signatures of their collapses.
Testing a causal model of the relationship between physical exercise and cognition during childhood: A longitudinal study.
Creators: name: Muros, José Joaquín
name: Román-Caballero, Rafael
name: Villodres, Cristina
name: Sanabria, Daniel
name: Perez, Luis Ciria
Publisher: name: Open Science Framework
Year: 2023
Subjects: subject: Social and Behavioral Sciences
subject: Cognitive Psychology
subject: Health Psychology
subject: Child Psychology
subject: Developmental Psychology
subject: School Psychology
subject: Psychology
subject: FOS: Psychology
subject: Sports Studies
subject: longitudinal study
subject: physical activity
subject: cognition
subject: physical exercise
subject: academic performance
subject: causal model

description: The causal relationship between regular physical exercise and cognition during childhood seems unquestionable, based on the systematic reviews and meta-analyses published to date. However, there are also studies that question these claims, showing that the evidence is not as strong as it would seem. A recent study carried out by our research group has shown that, once corrected for relevant moderators and publication bias, the effect of exercise on cognition (in healthy people of all ages) provided by randomized controlled intervention studies is practically 0. A Bayesian analysis reveals that the data available to date from intervention studies do not provide evidence either for or against the existence of the effect. The present project is based on the rationale that intervention studies may not be adequate to capture such a causal relationship, if it exists, and proposes instead to test a causal model to be evaluated by means of a longitudinal study. This causal model takes into account both variables that could mediate the relationship between physical exercise and cognition during childhood, moderating variables, as well as confounding variables and colliders. We hope therefore to contribute to the knowledge about whether regular physical exercise during childhood really provides benefits beyond physical health.
Topology of Vibro-Impact Systems in the Neighborhood of Grazing
Creators: name: Kryzhevich, Sergey
name: Wiercigroch, Marian
Publisher: name: arXiv
Year: 2011
Subjects: subject: Dynamical Systems (math.DS)
subject: FOS: Mathematics
subject: 37G30 (Primary), 37N05 (Secondary)

description: The grazing bifurcation is considered for the Newtonian model of vibro-impact systems. A brief review on the conditions, sufficient for existence of a grazing family of periodic solutions, is given. The properties of these periodic solutions are discussed. A plenty of results on the topological structure of attractors of vibro-impact systems is known. However, since the considered system is strongly nonlinear, these attractors may be invisible or, at least, very sensitive to changes of parameters of the system. On the other hand, they are observed in experiments and numerical simulations. We offer (Theorem 2) an approach which allows to explain this contradiction and give a new robust mathematical model of the non-hyperbolic dynamics in the neighborhood of grazing.
description: Submitted to Physica D
The Connection Between Partner's Jealousy and Attraction
Creators: name: Litinsky, Ronit
name: Rifinski, Noa
name: Vengrover, Elad
Publisher: name: Open Science Framework
Year: 2023
Subjects: subject: Psychology
subject: FOS: Psychology
subject: Social and Behavioral Sciences

description: This is a pre-registration for our research, as part of Experimental Psychology course (Tel-Aviv University).
CARREIRAS, José Albuquerque (dir.) – Mosteiros Cistercienses. História, Arte, Espiritualidade e Património. [S.l.]: Jorlis – Edições e Publicações, 2013. 3 tomos. T. I: 436 p., ISBN 978-989-98209-1-3; T. II: 513 p., ISBN 978-989-98209-2-0; T. III: 479 p.
Creators: name: Jana, Ernesto Alves
Publisher: name: Lusitania Sacra
Year: 2016

description: Lusitania Sacra, n. 33 (2016): Mobilidades Medievais: Carreiras, Projetos, Realizações
Structure of Singular Sets Local to Cylindrical Singularities for Stationary Harmonic Maps and Mean Curvature Flows
Creators: name: Wells-Day, Benjamin Michael
Publisher: name: Apollo - University of Cambridge Repository
Year: 2019
Subjects: harmonic maps
mean curvature flows
brakke flows
singularities
geometric measure theory

description: In this paper we prove structure results for the singular sets of stationary harmonic maps and mean curvature flows local to particular singularities. The original work is contained in Chapter 5 and Chapter 8. Chapters 1-5 are concerned with energy minimising maps and stationary harmonic maps. Chapters 6-8 are concerned with mean curvature flows and Brakke flows. In the case of stationary harmonic maps we consider a singularity at which the spine dimension is maximal, and such that the weak tangent map is homotopically non-trivial, and has minimal density amongst singularities of maximal spine dimen- sion. Local to such a singularity we show the singular set is a bi-Hölder continuous homeomorphism of the unit disk of dimension equal to the maximal spine dimension. A weak tangent map is translation invariant along a subspace, and invariant under dilations, so it completely defined by its values on a sphere. Such a map is said to be homotopically non-trivial if the mapping of a sphere into some target manifold cannot be deformed by a homotopy to a constant map. For an n-dimensional mean curvature flow we consider a singularity at which we can find a shrinking cylinder as a tangent flow, that collapses on an (n−1)-dimensional plane. Local to such a singularity we show that all singularities have such a cylindrical tangent, or else have lower Gaussian density than that of the shrinking cylinder. The subset of cylindrical singularities can be shown to be contained in a finite union of parabolic (n − 1)-dimensional Lipschitz submanifolds. In the case that the mean curvature flow arises from elliptic regularisation we can show that all singularities local to a cylindrical singularity with (n − 1)-dimensional spine are either cylindrical singularities with (n − 1)-dimensional spine, or contained in a parabolic Hausdorff (n − 2)-dimensional set.
FONTES, João Luís; ANDRADE, Maria Filomena; MARQUES, Tiago Pires (coord.) – Vozes da vida religiosa feminina. Experiências, textualidades e silêncios (séculos XV-XXI). Lisboa: Centro de Estudos de História Religiosa – UCP, 2015. 198 p. ISBN 9789728361617
Creators: name: Fernandes, Maria De Lurdes Correia
Publisher: name: Lusitania Sacra
Year: 2016

description: Lusitania Sacra, n. 33 (2016): Mobilidades Medievais: Carreiras, Projetos, Realizações
No arrivals : the cultural politics of mobilities in queer Asian diasporas in Canada
Creators: name: Kojima, Dai
Publisher: name: University of British Columbia
Year: 2015

description: This dissertation project examines the cultural politics of mobilities for the organization of counterpublics and oral histories in and across marginalized communities within a transnational migration frame. I conducted a three-year, interview-based and media-centered ethnography in the Lower Mainland of British Columbia with fourteen queer migrant men and a transgender migrant woman with a wide range of intersectional identifications and residence statuses, who were originally from multiple countries and regions across Pacific Asia. The purpose of this fieldwork was to trace the translocal movements of queer Asian migrants with a critical attention to how their encounters with national discourses, histories and knowledges of race and sexuality shaped the trajectories of their life narratives. Drawing on these embodied accounts, my analyses illustrate how these migrant, racial strangers and sexual others manage to negotiate multiple displacing forces through tactical practices of representation, space-making, and diasporic networks of kinship and care with and through media. This interdisciplinary project significantly contributes to several areas of theorizing. First, this study revises theories of agency in mobilities research by introducing the concept of mobility as problematic to highlight the cultural dynamics between displacement and movement, and foregrounds the everyday, mediated practices of mobility as various forms of survival that often remain invisible to structural analysis and theory. Second, this project advances queer critiques of race by analyzing how queer Asian migrants do and perform racialized identity. This research theorizes how transnational subjects actively participate in global processes of racialization, which departs significantly from traditional scholarship that underscores national frames and histories of race and sexuality. Finally, this project contributes to postcolonial feminist methodologies by introducing a queer historiography method I call enigma as evidence. This innovative framework argues for elusive meanings, identities and silences as a productive site for ethically charged research practices that evidence the experiences of oppression, survival and everyday intimacies of cultural others.
Amendment to existing preregistration: The influence of gaze direction and emotional context on prosocial behavior: Testing the social contagion hypothesis
Creators: name: Böckler, Anne
name: Breil, Christina
name: Micheli, Leticia
Publisher: name: Open Science Framework
Year: 2023
Subjects: subject: Cognition and Perception
subject: Social and Behavioral Sciences
subject: Social Psychology
subject: Psychology
subject: FOS: Psychology

description: During the review process of this project, a reviewer pointed out to us that hypotheses 2a of our existing preregistration named " The influence of gaze direction and emotional context on prosocial behavior: Testing the social contagion hypothesis" had a missing word that could hinder the understanding of the hypothesis. We aim to clarify this hypothesis with this amendment.
Neutron Star Astronomy in the era of the European Extremely Large Telescope
Creators: name: Mignani, Roberto P.
Publisher: name: arXiv
Year: 2010
Subjects: subject: Instrumentation and Methods for Astrophysics (astro-ph.IM)
subject: FOS: Physical sciences

description: About 25 isolated neutron stars (INSs) are now detected in the optical domain, mainly thanks to the HST and to VLT-class telescopes. The European Extremely Large Telescope (E-ELT) will yield ~100 new identifications, many of which from the follow-up of SKA, IXO, and Fermi observations. Moreover, the E-ELT will allow to carry out, on a much larger sample, INS observations which still challenge VLT-class telescopes, enabling studies on the structure and composition of the NS interior, of its atmosphere and magnetosphere, as well as to search for debris discs. In this contribution, I outline future perspectives for NS optical astronomy with the E-ELT.
description: 4 pages, to be published in Proceedings of the Conference "ASTROphysics of Neutron Stars 2010", a conference in honor of M. Ali Alpar, held in Cesme (Izmir) August 2-6 2010
ANTUNES, Vitória Baltazar – S. Gonçalo de Lagos. Torres Vedras: Município de Torres Vedras; Agrupamento de Escolas de S. Gonçalo/Biblioteca Escolar, 2010. 35 p.
Creators: name: Guimarães, Jorge Gonçalves
Publisher: name: Lusitania Sacra
Year: 2016

description: Lusitania Sacra, n. 33 (2016): Mobilidades Medievais: Carreiras, Projetos, Realizações
Measuring the Lifetime of Trapped Sleptons Using the General Purpose LHC Detectors
Creators: name: Pinfold, J. L.
name: Sibley, L.
Publisher: name: arXiv
Year: 2010
Subjects: subject: High Energy Physics - Phenomenology (hep-ph)
subject: FOS: Physical sciences

description: In supergravity where the gravitino is the lightest supersymmetric particle (LSP), the next-to-lightest supersymmetric particle (NLSP) decays to the gravitino with a naturally long lifetime (10^4 - 10^8). However, cosmological constraints favour charged sleptons with lifetimes below a year as the natural NLSP candidate. For this scenario we report a method to accurately determine the slepton lifetime and SUSY cross-section from observation of the decays of sleptons trapped in the material comprising the main detector (ATLAS, CMS). A measurement of the lifetime to 5% is possible after 3 years at nominal luminosity and running conditions. This method is sensitive to the cosmologically preferred stau lifetime of ~37 days and does not require the use of ancillary trapping volumes.