cometadata/datacite-rtg-text-other-reclassification-records huggingface dataset:
The relationship between maternal serum and breast milk vitamin B12 concentrations in a primarly supplemented versus an unsupplemented group : assesed at eight weeks postpartum
Creators: name: Chebaya, Philip
Publisher: name: University of British Columbia
Year: 2015

description: BACKGROUND: Vitamin B12 is an essential nutrient for adequate infant growth and development and breast milk is the only dietary source of vitamin B12 to the exclusively breast-fed infant. Little is known on the relationship between maternal serum vitamin B12 and breast milk vitamin B12. A better understanding of this relationship will provide insight into the determinants of milk vitamin B12 concentrations, including maternal vitamin B12 supplementation, for optimal infant vitamin B12 status. OBJECTIVE: To determine the association between maternal serum and breast milk vitamin B12 concentrations at eight weeks postpartum in both a supplemented and unsupplemented population and to explore these associations with infant serum vitamin B12 concentrations in the supplemented group. METHODS: Vitamin B12 concentrations were measured in infant serum, maternal serum and breast milk samples (n=186) collected from two previous studies; in Canada (supplemented) and New Zealand (unsupplemented). Supplemented participants were provided with a prenatal supplement containing 12µg of vitamin B12 during pregnancy to eight weeks postpartum. Breast milk and maternal blood were available from both studies, with infant blood only available from the supplemented group. Serum samples were measured using an Elecsys immunoassay analyzer, while an IMMULITE chemiluminescence machine measured breast milk vitamin B12 concentrations. RESULTS: The supplemented group had significantly higher serum vitamin B12 concentrations (Geometric mean: 665pmol/l; 95%CI: 601,685) compared to the unsupplemented group (403pmol/l, 365, 445). Maternal serum vitamin B12 was associated with breast milk vitamin B12 in the supplemented and unsupplemented groups (r=0.577, p<0.0001; r=0.414 p=0.01, respectively). Infant serum vitamin B12 concentrations were associated with both maternal serum vitamin B12 (r=0.299 p=0.001) and breast milk B12 (r=337 p<0.0001) concentrations. CONCLUSION: Supplement use during pregnancy and lactation may lead to higher vitamin B12 concentrations in maternal serum and breast milk. Infant serum vitamin B12 concentrations appear to be related to maternal status and this may be mediated by enhanced breast milk vitamin B12. Further RCT are needed to investigate the effects of maternal vitamin B12 supplementation on infant vitamin B12 status.
An update of the on-sky performance of the Layer-Oriented wave-front sensor for MAD
Creators: name: Arcidiacono, Carmelo
name: Lombini, Matteo
name: Moretti, Alessia
name: Ragazzoni, Roberto
name: Farinato, Jacopo
name: Falomo, Renato
name: Gullieuszik, Marco
name: Piotto, Giampaolo
Publisher: name: arXiv
Year: 2010
Subjects: subject: Instrumentation and Methods for Astrophysics (astro-ph.IM)
subject: FOS: Physical sciences

description: The Multi-conjugate Adaptive optics Demonstrator, MAD, successfully demonstrated on sky the MCAO technique both in Layer Oriented and Star Oriented modes. As results of the Guaranteed Time Observations in Layer Oriented mode quality astronomy papers have been published. In this paper we concentrate on the instrumentation issues and technical aspects which stay behind this success.
description: 12 pages, 10 figures, Proceedings of the SPIE conference "Adaptive Optics Systems II", 27 June 2010, San Diego, California, USA
Supplementary Materials from Human fertility after a disaster: a systematic literature review
Creators: name: Lee, D. Susie
name: Batyra, Ewa
name: Castro, Andres
name: Wilde, Joshua
Publisher: name: The Royal Society
Year: 2023
Subjects: subject: Environmental Science
subject: 60801 Animal Behaviour
subject: FOS: Biological sciences

description: Fertility is a key demographic parameter influenced by disaster. With the growing risk of disasters, interest in the fertility response to a disaster is increasing among the public, policy makers and researchers alike. However, a systematic literature review on how disaster affects live birth counts does not yet exist. We reviewed 50 studies retrieved from a systematic search based on a pre-registered protocol. We found an overall negative impact of disasters on fertility. If any, increases in fertility were mostly linked with weather-related physical disasters. We also identified 13 distinct mechanisms which researchers have considered as underlying the fertility effects of disaster. By contrast to the common belief that disasters are more likely to increase fertility in contexts with already high fertility, we found little evidence to suggest that the total fertility rate of the studied populations was an important predictor of the direction, timing or size of fertility impacts. While this may be because no relationship exists, it may also be due to biases we observed in the literature towards studying high-income countries or high-cost disasters. We summarize the methodological limitations identified from the reviewed studies into six practical recommendations for future research. Our findings inform both the theories behind the fertility effects of disasters and the methods for studying them.
SILVA, Maria João Oliveira e – A escrita na catedral. A Chancelaria episcopal do Porto na Idade Média. Lisboa: Centro de Estudos de História Religiosa, 2013. 398 p. ISBN 978-972-8361-54-9
Creators: name: Vilar, Hermínia Vasconcelos
Publisher: name: Lusitania Sacra
Year: 2015

description: Lusitania Sacra, n. 31 (2015): Vivências Religiosas Femininas Medievais
A Panchromatic View OF NGC 602: Time-Resolved Star Formation with the Hubble and Spitzer Space Telescopes
Creators: name: Carlson, Lynn Redding
name: Sewilo, Marta
name: Meixner, Margaret
name: Romita, Krista A.
name: Whitney, Barbara
name: Hora, Joseph L.
name: Cignoni, M.
name: Sabbi, E.
name: Nota, A.
name: Sirianni, M.
name: Smith, L. J.
name: Gordon, K.
name: Babler, B.
name: Bracker, S.
name: Gallagher, J. S.
name: Meade, M.
name: Misselt, K.
name: Pasquali, A.
name: Shiao, B.
Publisher: name: arXiv
Year: 2010
Subjects: subject: Solar and Stellar Astrophysics (astro-ph.SR)
subject: FOS: Physical sciences

description: We present the photometric catalogs for the star-forming cluster NGC 602 in the wing of the Small Magellanic Cloud covering a range of wavelengths from optical HST/ACS (F555W, F814W) and SMARTS/ANDICAM (V, I) to infrared (Spitzer/IRAC 3.6, 4.5, 5.8, and 8 micron and MIPS 24 micron). Combining this with IRSF (InfraRed Survey Facility) near-infrared photometry (J, H, Ks), we compare the young main sequence (MS) and pre-main sequence (PMS) populations prominent in the optical with the current young stellar object (YSO) populations revealed by the infrared (IR). We analyze the MS and PMS population with isochrones in color-magnitude diagrams to derive ages and masses. The optical data reveal ~565 PMS candidates, low mass Stage III YSOs. We characterize ~40 YSOs by fitting their spectral energy distributions (SEDs) to a grid of models (Robitaille et al. 2007) to derive luminosities, masses and evolutionary phase (Stage I-III). The higher resolution HST images reveal that ~70% of the YSO candidates are either multiples or protoclusters. For YSOs and PMS sources found in common, we find a consistency in the masses derived. We use the YSO mass function to derive a present-day star-formation rate of ~0.2-1.0 Msun/yr/kpc^2, similar to the rate derived from the optical star formation history suggesting a constant star formation rate for this region. We demonstrate a progression of star formation from the optical star cluster center to the edge of the star forming dust cloud. We derive lifetimes of a few 10^5 years for the YSO Stages I and II.
description: 55 pages, 18 Figures; High resolution images available form author Accepted to ApJ
The mask of stoicism : intersections of masculinities and storytelling in trauma work with Veterans
Creators: name: Shields, Duncan MacArthur
Publisher: name: University of British Columbia
Year: 2015

description: An estimated 15 to 30 percent of Canada’s approximately 811,000 Veterans and serving military personnel are expected to experience posttraumatic stress injuries either immediately or even years after their deployment (VAC, 2013; DND, 2013). When Veterans’ traumatic stress injuries are not addressed through well-integrated interventions, stress reactions can contribute to the emergence of Posttraumatic Stress Disorder and associated difficulties such as substance abuse, increased aggression, relationship problems, depression, and suicide (Herman, 1997; Westwood et al., 2012). Males, who make up 88% of the Veteran population, experience these difficulties at proportionally higher rates than their female compatriots, and also have significantly lower usage rates for trauma therapies, and higher relapse rates and drop-out rates when they do access treatment (Brooks, 2010; van der Kolk, 2007; Westwood et al., 2012). While the key role of gender socialization in women’s experience and recovery from trauma has been extensively studied, there has been little attention paid to male social norms and expectations in Veterans’ psychological and physiological experience of trauma and the process of treatment and recovery (Brooks, 2010; Fox & Pease, 2012). The objective of this research was to “cast the net wide” to gain greater understanding of Veterans’ trauma experiences without reducing their uniqueness, their complexity, and their “embeddedness” and interaction with their contexts. By examining case examples from a cohort of male Veteran participants in a group trauma program, the UBC/Legion Veterans Transition Program (VTP), using interview, focus group and personal writings, and examples of cultural “master narratives”, it was hoped that a more coherent clinical picture would emerge of the relevance and impact of gender socialization on men’s trauma experience and their recovery and re-engagement in community. This research suggests that a gender informed approach to Veterans’ trauma work could contribute to more accessible, relevant and effective trauma treatment that respects male Veterans’ existing courageous and agentic helping and healing efforts.
Extraction of Electron Self-Energy and Gap Function in the Superconducting State of Bi_2Sr_2CaCu_2O_8 Superconductor via Laser-Based Angle-Resolved Photoemission
Creators: name: Zhang, Wentao
name: Bok, Jin Mo
name: Yun, Jae Hyun
name: He, Junfeng
name: Liu, Guodong
name: Zhao, Lin
name: Liu, Haiyun
name: Meng, Jianqiao
name: Jia, Xiaowen
name: Peng, Yingying
name: Mou, Daixiang
name: Liu, Shanyu
name: Yu, Li
name: He, Shaolong
name: Dong, Xiaoli
name: Zhang, Jun
name: Wen, J. S.
name: Xu, Z. J.
name: Gu, G. D.
name: Wang, Guiling
name: Zhu, Yong
name: Wang, Xiaoyang
name: Peng, Qinjun
name: Wang, Zhimin
name: Zhang, Shenjin
name: Yang, Feng
name: Chen, Chuangtian
name: Xu, Zuyan
name: Choi, H. -Y.
name: Varma, C. M.
name: Zhou, X. J.
Publisher: name: arXiv
Year: 2011
Subjects: subject: Superconductivity (cond-mat.supr-con)
subject: Strongly Correlated Electrons (cond-mat.str-el)
subject: FOS: Physical sciences

description: Super-high resolution laser-based angle-resolved photoemission measurements have been performed on a high temperature superconductor Bi_2Sr_2CaCu_2O_8. The band back-bending characteristic of the Bogoliubov-like quasiparticle dispersion is clearly revealed at low temperature in the superconducting state. This makes it possible for the first time to experimentally extract the complex electron self-energy and the complex gap function in the superconducting state. The resultant electron self-energy and gap function exhibit features at ~54 meV and ~40 meV, in addition to the superconducting gap-induced structure at lower binding energy and a broad featureless structure at higher binding energy. These information will provide key insight and constraints on the origin of electron pairing in high temperature superconductors.
description: 4 pages, 4 figures
FERREIRO, Alberto – The Visigoths in Gaul and Ibéria (Update). A Supplemental Bibliography, 2010-2012 Leiden/Boston: Brill, 2014. 365 p. ISBN 978-90-0421222-0
Creators: name: Jorge, Ana Maria C. M.
Publisher: name: Lusitania Sacra
Year: 2015

description: Lusitania Sacra, n. 31 (2015): Vivências Religiosas Femininas Medievais
Coordinated activities of chromatin modifying complexes in DNA regulation in Saccharomyces cerevisiae
Creators: name: Lu, Ya Ting Phoebe
Publisher: name: University of British Columbia
Year: 2015

description: As the sole carrier of genetic information, DNA does not exist as a naked template in the eukaryotic genome; instead DNA exists as a nucleoprotein complex. Wrapped around specialized histone proteins, DNA and histones are assembled into the organized chromatin structure. The chromatin structure is regulated by a wide assortment of factors to facilitate access to the genetic material while at the same time compacting the genome. Perhaps it is not surprising that the coordinated activities of multiple chromatin-modifying complexes are necessary to regulate the many biological process occurring on DNA. We are beginning to understand how chromatin-modifying mechanisms cooperate to regulate gene promoters and define unique chromatin neighbourhoods. In this dissertation, I explore the functional connections between chromatin remodeling complexes, histone chaperones and histone variants in various aspects of chromatin biology. Focusing on the synthetic genetic interaction between ASF1 and YAF9, I uncovered the cooperative activities of histone chaperone and the SWR1-C H2A.Z exchange complex in maintaining heterochromatin boundaries. Furthermore, I also identified that H2A.Z occupancy at gene promoters is partially dependent on Asf1-mediated H3K56 acetylation. I specifically studied the functional relationship between H3K56 acetylation and H2A.Z occupancy. I determined that acetylation of H3K56 was required for maintaining H2A.Z levels at gene promoters. Furthermore, I discovered that H3K56 acetylation was also important in positioning H2A.Z containing nucleosomes at promoters. Lastly, I explored the specific features required for NuA4 structure and histone acetylation function. I uncovered a novel regulatory relationship between the Eaf1 scaffold protein and the Epl1 C-terminus that anchors the catalytic module to the NuA4 complex. In addition, I demonstrated that the Epl1 C-terminus and the Eaf1 HSA domain are the two key domains regulating the cellular equilibrium of NuA4 and picNuA4. Collectively, the work presented in the dissertation adds to our understanding of the interface between chromatin remodeling complexes, histone chaperones and histone variants in the regulation of chromatin biology and highlights the important role chromatin structure plays in basic cellular processes.
The quark-antiquark spectrum from upside down
Creators: name: van Beveren, Eef
name: Rupp, George
Publisher: name: arXiv
Year: 2010
Subjects: subject: High Energy Physics - Phenomenology (hep-ph)
subject: High Energy Physics - Experiment (hep-ex)
subject: Nuclear Theory (nucl-th)
subject: FOS: Physical sciences

description: We argue that the spectra of quark-antiquark systems should better be studied from higher radial excitations and, in particular, from configurations with well-defined quantum numbers, rather than from ground states and lower radial excitations, the most suitable system being charmonium.
description: 4 pages, plain LaTeX, 1 figure
Apresentação oficial do Projeto PAPIR – Plataforma de Arquivos Pessoais e de Instituições Religiosas: Porto, 29 de junho de 2015
Creators: name: Leal, Luís
Publisher: name: Lusitania Sacra
Year: 2015

description: Lusitania Sacra, n. 31 (2015): Vivências Religiosas Femininas Medievais
Conferência Anglicana/Velho-Católica em torno do 50.º Aniversário da Concordata de Plena Comunhão entre a Igreja Lusitana, a Igreja Espanhola Reformada Episcopal e a União de Utreque (Igrejas Velho-Católicas): Lisboa, 26 e 27 de junho de 2015
Creators: name: Leite, Rita Mendonça
Publisher: name: Lusitania Sacra
Year: 2015

description: Lusitania Sacra, n. 31 (2015): Vivências Religiosas Femininas Medievais
A giant planet imaged in the disk of the young star Beta Pictoris
Creators: name: Lagrange, A. -M.
name: Bonnefoy, M.
name: Chauvin, G.
name: Apai, D.
name: Ehrenreich, D.
name: Boccaletti, A.
name: Gratadour, D.
name: Rouan, D.
name: Mouillet, D.
name: Lacour, S.
name: Kasper, M.
Publisher: name: arXiv
Year: 2010
Subjects: subject: Earth and Planetary Astrophysics (astro-ph.EP)
subject: FOS: Physical sciences

description: Here we show that the ~10 Myr Beta Pictoris system hosts a massive giant planet, Beta Pictoris b, located 8 to 15 AU from the star. This result confirms that gas giant planets form rapidly within disks and validates the use of disk structures as fingerprints of embedded planets. Among the few planets already imaged, Beta Pictoris b is the closest to its parent star. Its short period could allow recording the full orbit within 17 years.
description: 4 pages, 2 figures. Published online 10 June 2010; 10.1126/science.1187187. To appear in Science
Jornadas de Estudo “Identidade Social, Religião e Aparelhos de Estado na Grande Lisboa”: Lisboa, 26 de junho de 2015
Creators: name: Ferreira, António Matos
name: Tuna, Cátia
name: Matos, Luís Salgado De
Publisher: name: Lusitania Sacra
Year: 2015

description: Lusitania Sacra, n. 31 (2015): Vivências Religiosas Femininas Medievais
Erbsen in der Schweinemast
Creators: name: Wochner, Sarah
name: Heid, Astrid
Publisher: name: Zenodo
Year: 2021
Subjects: Schweinefütterung
Schweine
Erbsen

description: Heimische Körnerleguminosen werden in der Schweinemast immer seltener eingesetzt. Grund hierfür ist die überwiegende Proteinversorgung über Soja und Sojaprodukte, deren Inhaltsstoffe gut zum Bedarf der Schweine passen. Es kann aber dennoch sinnvoll sein, andere Leguminosen wie Erbsen oder Ackerbohnen in die Ration aufzunehmen. Diese Practice Note stellt den Betrieb von Michael Strecker vor, der selbst angebaute Erbsen für die Fütterung seiner Schweine nutzt.
Sliding displacements in reinforced masonry walls subjected to in-plane lateral loads
Creators: name: Centeno, Jose
Publisher: name: University of British Columbia
Year: 2015

description: Seismic design provisions in the Canadian Masonry Code often lead to indications that the governing yield mechanism for a reinforced masonry wall with a height/length (H/L) ratio below 1.0 and under low axial loads will not achieve the design objective of a flexural yield mechanism and instead, will develop a sliding shear mechanism. In addition to this, results of previous experimental research studies indicate that even for squat walls that yield in flexure, the displacements at the top are the result of both flexure and sliding shear mechanisms. Currently, there is a limited understanding on how sliding shear displacements develop and how they affect the response of a building. The following work sets out to study the sliding shear mechanism and to develop tools for determining the corresponding displacements for seismic design. This study proposes to modify the current definition for a sliding shear mechanism, re-classifying yield mechanisms of Reinforced Masonry (RM) walls with sliding displacements into three separate mechanisms: sliding shear (SS) mechanism, dowel-constrained failure (DCF) mechanism and combined flexural-sliding shear (CFSS) mechanism. In addition, a 2D analytical model is developed and calibrated in this study using the experimental test results of wall specimens with recorded sliding shear displacements. This calibrated model simulates sliding in RM walls based on the effects of frictional resistance, dowel action and flexural hinging, which will be the basis for a procedure that can estimate sliding displacements in an RM wall design.
Optimizing Tandem Speaker Verification and Anti-Spoofing Systems
Creators: name: Kanervisto, Anssi
name: Hautamäki, Ville
name: Kinnunen, Tomi
name: Yamagishi, Junichi
Publisher: name: arXiv
Year: 2022
Subjects: subject: Sound (cs.SD)
subject: Cryptography and Security (cs.CR)
subject: Machine Learning (cs.LG)
subject: Audio and Speech Processing (eess.AS)
subject: FOS: Computer and information sciences
subject: FOS: Electrical engineering, electronic engineering, information engineering

description: As automatic speaker verification (ASV) systems are vulnerable to spoofing attacks, they are typically used in conjunction with spoofing countermeasure (CM) systems to improve security. For example, the CM can first determine whether the input is human speech, then the ASV can determine whether this speech matches the speaker's identity. The performance of such a tandem system can be measured with a tandem detection cost function (t-DCF). However, ASV and CM systems are usually trained separately, using different metrics and data, which does not optimize their combined performance. In this work, we propose to optimize the tandem system directly by creating a differentiable version of t-DCF and employing techniques from reinforcement learning. The results indicate that these approaches offer better outcomes than finetuning, with our method providing a 20% relative improvement in the t-DCF in the ASVSpoof19 dataset in a constrained setting.
description: Published in IEEE/ACM Transactions on Audio, Speech, and Language Processing. Published version available at: https://ieeexplore.ieee.org/document/9664367
QURILISH IQTISODIYOTIDA INNOVATSION YONDASHUVLARNING SAMARADORLIGI
Creators: name: Abdullaev, Axror
Publisher: name: Zenodo
Year: 2025

description: Ушбу мақолада қурилиш иқтисодиётида инновацион ёндашувларнинг самарадорлиги таҳлил қилинади. Технологик инновациялар, рақамли моделлаштириш ва устувор ривожланиш концепциялари асосида янги ёндашувлар таклиф этилган
La hibridez genérica en dos obras de Manlio Argueta Un día en la vida (1980) y Cuzcatlán donde bate la mar del sur (1986)
Creators: name: Robles Penate, Ana Esmeralda
Publisher: name: University of British Columbia
Year: 2015

description: The primary objective of this project is to problematize the literary genres used by the Salvadorian author Manlio Argueta (El Salvador, 1935) in two of his texts. The primary texts used are Un día en la vida (1980) and Cuzcatlán donde bate la mar del sur (1986). In both these works the historical, social, political and cultural experiences of El Salvador are novelized through the voice of testimony. Through a review of the testimonial theory and an analysis of the text we observe that these life narratives experience a hybridization of genres, because through an aesthetic and poetic language the author merges both a literary genre the novel and a genre with a social commitment the testimonio. Through this fusion the author is not only able to expose his own life experience but he is also able to give voice to the voiceless, and create a more impactful narrative.
Electrode level Monte Carlo model of radiation damage effects on astronomical CCDs
Creators: name: Prod'homme, T.
name: Brown, A. G. A.
name: Lindegren, L.
name: Short, A. D. T.
name: Brown, S. W.
Publisher: name: arXiv
Year: 2011
Subjects: subject: Instrumentation and Methods for Astrophysics (astro-ph.IM)
subject: FOS: Physical sciences

description: Current optical space telescopes rely upon silicon Charge Coupled Devices (CCDs) to detect and image the incoming photons. The performance of a CCD detector depends on its ability to transfer electrons through the silicon efficiently, so that the signal from every pixel may be read out through a single amplifier. This process of electron transfer is highly susceptible to the effects of solar proton damage (or non-ionizing radiation damage). This is because charged particles passing through the CCD displace silicon atoms, introducing energy levels into the semi-conductor bandgap which act as localized electron traps. The reduction in Charge Transfer Efficiency (CTE) leads to signal loss and image smearing. The European Space Agency's astrometric Gaia mission will make extensive use of CCDs to create the most complete and accurate stereoscopic map to date of the Milky Way. In the context of the Gaia mission CTE is referred to with the complementary quantity Charge Transfer Inefficiency (CTI = 1-CTE). CTI is an extremely important issue that threatens Gaia's performances. We present here a detailed Monte Carlo model which has been developed to simulate the operation of a damaged CCD at the pixel electrode level. This model implements a new approach to both the charge density distribution within a pixel and the charge capture and release probabilities, which allows the reproduction of CTI effects on a variety of measurements for a large signal level range in particular for signals of the order of a few electrons. A running version of the model as well as a brief documentation and a few examples are readily available at http://www.strw.leidenuniv.nl/~prodhomme/cemga.php as part of the CEMGA java package (CTI Effects Models for Gaia).
description: Accepted by MNRAS on 13 February 2011. 15 pages, 7 figures and 5 tables
Oxygen budgets and productivity estimates in the Strait of Georgia from a continuous ferry-based monitoring system
Creators: name: Wang, Chuning
Publisher: name: University of British Columbia
Year: 2015

description: The oxygen budget in the top 50 m of lower Strait of Georgia, British Columbia is investigated using high resolution measurements of dissolved oxygen concentration and other oceanographic and meteorological properties from an instrumented ferry. An budget equation is established to describe the oxygen balance in the surface Strait of Georgia. The budget equation consists of 4 parts, which includes (1) the storage rate term, which is calculated with the ferry oxygen measurements using a 2-point differential scheme; (2) advective and vertical transport, which is estimated using a box model; (3) air-sea gas transfer, which is estimated using a bulk parametrization of air-sea gas flux; and (4) net community productivity, which is estimated by taking the residual of the budget equation. To further investigate the productivity level in the Strait of Georgia, daily community respiration rate is estimated by extracting the diurnal variation signal of oxygen, and gross productivity is estimated by combining net community productivity with the community respiration rate. Results suggest that gross productivity in the lower Strait of Georgia varies from 1.4 to 11.8 gC.m-²day-¹ and averages at 4.4 gC.m-²day-¹, slightly higher than historical measurements.
Evolution from BCS to BEC superfluidity in the presence of spin-orbit coupling
Creators: name: Han, Li
name: de Melo, C. A. R. Sá
Publisher: name: arXiv
Year: 2011
Subjects: subject: Quantum Gases (cond-mat.quant-gas)
subject: FOS: Physical sciences

description: We discuss the evolution from BCS to BEC superfluids in the presence of spin-orbit coupling, and show that this evolution is just a crossover in the balanced case. The dependence of several thermodynamic properties, such as the chemical potential, order parameter, pressure, entropy, isothermal compressibility and spin susceptibility tensor on the spin-orbit coupling and interaction parameter at low temperatures are analyzed. We studied both the case of equal Rashba and Dresselhaus (ERD) and the Rashba-only (RO) spin-orbit coupling. Comparisons between the two cases reveal several striking differences in the corresponding thermodynamic quantities. Finally we propose measuring the spin susceptibility as a means to detect the spin-orbit coupling effect.
Rapid Oscillations in Cataclysmic Variables. XVII. 1RXS J070407+262501
Creators: name: Patterson, J.
name: Thorstensen, J. R.
name: Sheets, H. A.
name: Kemp, J.
name: Vican, L.
name: Uthas, H.
name: Boyd, D.
name: Potter, M.
name: Krajci, T.
name: Campbell, T.
name: Roberts, G.
name: Starkey, D.
name: Goff, B.
Publisher: name: arXiv
Year: 2010
Subjects: subject: Solar and Stellar Astrophysics (astro-ph.SR)
subject: FOS: Physical sciences

description: We present a study of the recently discovered intermediate polar 1RXS J070407+262501, distinctive for its large-amplitude pulsed signal at P = 480 s. Radial velocities indicate an orbital period of 0.1821(2) d, and the light curves suggest 0.18208(6) d. Time-series photometry shows a precise spin period of 480.6700(4) s, decreasing at a rate of 0.096(9) ms/yr, i.e. on a time scale P/P-dot =2.5 x 10^6 yr. The light curves also appear to show a mysterious signal at P = 0.263 d, which could possibly signify the presence of a "superhump" in this magnetic cataclysmic variable.
description: Publications of the Astronomical Society of the Pacific, in press
Prospects for KLOE-2
Creators: name: Moskal, P.
Publisher: name: arXiv
Year: 2010
Subjects: subject: High Energy Physics - Experiment (hep-ex)
subject: FOS: Physical sciences

description: The basic motivation of the KLOE-2 experiment is the test of fundamental symmetries and Quantum Mechanics coherence of the neutral kaon system, and the search for phenomena beyond the Standard Model in the hadronic and leptonic decays of ground-state mesons. Perspectives for experimentation by means of the KLOE-2 apparatus equipped with the inner tracker, new scintillation calorimeters, and the gamma-gamma taggers at the DA\$Phi$NE electron-positron collider upgraded in luminosity and energy are presented.
description: Invited talk at the MESON2010 conference in Krakow, June 2010
Laser cooling of a nanomechanical oscillator into its quantum ground state
Creators: name: Chan, Jasper
name: Alegre, T. P. Mayer
name: Safavi-Naeini, Amir H.
name: Hill, Jeff T.
name: Krause, Alex
name: Groeblacher, Simon
name: Aspelmeyer, Markus
name: Painter, Oskar
Publisher: name: arXiv
Year: 2011
Subjects: subject: Quantum Physics (quant-ph)
subject: FOS: Physical sciences

description: A patterned Si nanobeam is formed which supports co-localized acoustic and optical resonances that are coupled via radiation pressure. Starting from a bath temperature of T=20K, the 3.68GHz nanomechanical mode is cooled into its quantum mechanical ground state utilizing optical radiation pressure. The mechanical mode displacement fluctuations, imprinted on the transmitted cooling laser beam, indicate that a final phonon mode occupancy of 0.85 +-0.04 is obtained.
description: 18 pages, 10 figures
Merging black hole and cosmological horizons
Creators: name: Prat, Alain
Publisher: name: University of British Columbia
Year: 2015

description: This thesis investigates the merging of horizons which occurs when a black hole crosses a cosmological horizon. We study the simplest spacetime which has both a black hole and cosmological horizon, namely Schwarzschild-deSitter (SdS) spacetime. First we develop a new coordinate system for SdS spacetime, which allows us to properly illustrate and analyze the merging of horizons. We then use a combination of numerical and analytical methods to study the structure of the merging horizons, including the null generators which make up the horizon, as well as the presence of caustic points on the horizon. We find an analytical formula for the location in spacetime where the black hole and cosmological horizon first touch. Next we study the area of the horizons. Using numerical methods, we find several intriguing results regarding the behavior of horizon area on time, and in the limit of small black hole mass. The first result is that the time at which the black hole first touches the cosmological horizon is also the time at which the rate of horizon area increase is maximal. The second and third results concern the horizon area in the limit of small black hole mass. The second result is that in this limit, all of the increase in horizon area occurs prior to horizon merger. The third and final result is that in the limit of small black hole mass, the increase in horizon area can be thought of as being due in equal parts to two effects: to the joining of new generators not previously on the horizon, and the expansion of generators on the horizon for all times. The first and third results just mentioned are both corroborated using analytical techniques. Finally, we conclude by discussing how the study of merging horizons in this thesis is a valuable first step to undertaking a similar study of the horizons which occur in merging black hole binaries.
Jornadas de estudo "Coptas e do Oriente Cristão": Lisboa, 18 a 20 de junho de 2015
Creators: name: Thomaz, Luís Filipe
Publisher: name: Lusitania Sacra
Year: 2015

description: Lusitania Sacra, n. 31 (2015): Vivências Religiosas Femininas Medievais
II Simposio Internacional de Estudios Inquisitoriales “Nuevas Fronteras”. Alcalá de Henares, 10 a 12 de junho de 2015
Creators: name: Martins, João Furtado
Publisher: name: Lusitania Sacra
Year: 2015

description: Lusitania Sacra, n. 31 (2015): Vivências Religiosas Femininas Medievais
Stochastic multi-objective optimization problem of electrical interconnection within an floating offshore wind farm
Creators: name: Rapha, Jose Ignacio
name: Domínguez-García, Jose Luis
name: Kallinger, Magnus D.
name: Tsarknias, Nikos
Publisher: name: Zenodo
Year: 2023
Subjects: Floating Wind
Layout optimization
Micrositting
Cost reduction

description: This deliverable will report the results obtained by the optimization algorithm as well as the methodology developed to enhance the electrical layout minimizing costs, loads and other decision aspects as the amount of Dynamic and static cable required
Speciation of the sulfuric acid-ferric sulfate-ferrous sulfate-water system and its application to chalcopyrite leaching kinetics up to 150 ºC
Creators: name: Yue, Guikuan
Publisher: name: University of British Columbia
Year: 2015

description: Hydrometallurgical oxidation methods are increasingly being considered for the extraction of Cu from chalcopyrite. However, the kinetics of cathodic ferric ion reduction are poorly understood. This thesis investigates the kinetics of cathodic ferric ion reduction on chalcopyrite and its influence on the leaching process in acidic iron sulfate solution, with an emphasis first placed on the development of a speciation model for the H₂SO₄-Fe₂(SO₄)₃-FeSO₄-H₂O system from 25°C-150°C. Speciation results show that most Fe(III) is distributed as complexes or precipitates and the free Fe³+ accounts for only a minor percentage (up to 5.2% of total ferric) whereas a large amount of Fe(II) exists in the form of free Fe²+. The Nernst equation was used to study the redox potential of Fe³+/Fe²+ couple. The speciation model explains the change of redox potential with temperature for all nominal Fe³+/Fe²+ ratios. This model was validated by reliable prediction of measured redox potential, comparison of previously published results of ferric solubility, together with an analysis of the calculated pH and ionic strength. A novel expression was also developed to predict the redox potential of the ferric/ferrous couple. It seems that the redox potential can be easily and accurately determined only based on the variables of temperature and nominal Fe³+/Fe²+ ratio. The calculated free Fe³+ concentration allowed for a detailed investigation of the reduction kinetics of ferric ion on chalcopyrite by cathodic potentiodynamic polarization. The exchange current densities of the Fe³+/Fe²+ couple are on the order of 10-⁷–10-⁵ A/cm² in the range of 25–150°C, substantially less than that on platinum. Calculated rate constants can be well described by the Arrhenius equation. The transfer coefficient increases linearly with temperature (rather than being constant). The importance of the cathodic ferric ion reduction reaction on the overall leaching process is progressively increased when increasing the nominal Fe³+/Fe²+ ratio and temperature. Leaching is under anodic control when the nominal Fe³+/Fe²+ ratio is around 1:1, whereas at higher nominal Fe³+/Fe²+ ratios and temperatures it is under mixed control. These findings provide the basis for mechanistic analyses and attendant optimization studies of industrial leaching processes of chalcopyrite and other sulfide minerals.
International Workshop “Narratives of Suffering, Persecution and Disappointment in the Early Modern Period. Giving Birth to New Martyrs”. Lisbon, 9th and 10th of April 2015
Creators: name: Russell, Camila
Publisher: name: Lusitania Sacra
Year: 2015

description: Lusitania Sacra, n. 31 (2015): Vivências Religiosas Femininas Medievais
Dynamic Solidification in Nanoconfined Water Films
Creators: name: Khan, Shah H.
name: Matei, George
name: Patil, Shivprasad
name: Hoffmann, Peter M.
Publisher: name: arXiv
Year: 2010
Subjects: subject: Soft Condensed Matter (cond-mat.soft)
subject: Mesoscale and Nanoscale Physics (cond-mat.mes-hall)
subject: Materials Science (cond-mat.mtrl-sci)
subject: FOS: Physical sciences

description: The mechanical properties of nanoconfined water layers are still poorly understood and continue to create considerable controversy, despite their importance for biology and nanotechnology. Here, we report on dynamic nanomechanical measurements of water films compressed down to a few single molecular layers. We show that the mechanical properties of nanoconfined water layers change dramatically with their dynamic state. In particular, we observed a sharp transition from viscous to elastic response even at extremely slow compression rates, indicating that mechanical relaxation times increase dramatically once water is compressed to less than 3-4 molecular layers.
Linguistic and cultural continuity through the symbolic representation of the naj 'house' in contemporary Mayan poetry
Creators: name: Wubbold, Manya
Publisher: name: University of British Columbia
Year: 2015

description: This interdisciplinary study (linguistic and literary) is based on a corpus of contemporary Mayan poetry that has been written in Peninsular (Yucatec) Maya and translated into Spanish by the authors. These particular poets were selected for this investigation because they have all participated in, or were influenced by the Resurgence in Mayan contemporary literature. And as writer/activists they write to promote and disseminate Mayan language and culture through poetry. All of the poems were selected for this corpus due to their rich depiction of Mayan cultural beliefs and symbolism and because they all feature the concept of naj ‘house’ as an essential and unifying theme. As the naj embodies (physically and metaphorically) the heart and/or center of Mayan Creation and re-Creation and is a recurrent conception in both pre-Colombian and contemporary Mayan literature, it is a key symbol utilized by these poets in reference to Mayan linguistic and cultural continuity. In addition to the naj, there are two other essential symbols―the three-stone hearth and the Ceiba or Mayan sacred tree―that unite these poems into a cohesive narrative. Like the naj, the three-stone hearth and the Ceiba are important icons in Mayan symbology representing the process of cultural generation and regeneration. By combining a linguistic (semantic) and literary analysis of the Mayan version of each poem, this investigation reveals information on how cultural symbolism is conceptualized and communicated through language and poetic expression unique to Mayan culture. In particular, this study focuses on the poets’ utilization of polysemous terminology and the poetic devices of difrasismo and parallelism to express complex networks of symbolic meaning. As this linguistic and poetic expression reflects structural aspects of the language as well as literary tropes recurrent in ancient (glyphic and pictorial) and contemporary works, it demonstrates a conceptual, linguistic, and literary continuity spanning millennia. The combined linguistic and literary analysis of this corpus was then utilized as the basis for a pedagogical proposal to be used in the training of bilingual teachers (Spanish/English) working in schools in Portland, Oregon serving a large community of Yucatec Maya living in diaspora.
Workshop “Entre o destino e a liberdade: o percurso histórico do problema da predestinação”. Lisboa, 26 a 28 de março de 2015
Creators: name: Silva, André De Campos
name: Tuna, Cátia
name: Leite, Rita Mendonça
Publisher: name: Lusitania Sacra
Year: 2015

description: Lusitania Sacra, n. 31 (2015): Vivências Religiosas Femininas Medievais
Workshop luso-brasileiro “A Igreja Católica em Portugal e no Atlântico Português (sécs. XVI-XVIII): uma historiografia em renovação?”. Lisboa, 9 e 10 de fevereiro de 2015
Creators: name: Silva, Hugo Ribeiro Da
Publisher: name: Lusitania Sacra
Year: 2015

description: Lusitania Sacra, n. 31 (2015): Vivências Religiosas Femininas Medievais
Giant current fluctuations in an overheated single electron transistor
Creators: name: Laakso, M. A.
name: Heikkilä, T. T.
name: Nazarov, Yuli V.
Publisher: name: arXiv
Year: 2010
Subjects: subject: Mesoscale and Nanoscale Physics (cond-mat.mes-hall)
subject: FOS: Physical sciences

description: Interplay of cotunneling and single-electron tunneling in a thermally isolated single-electron transistor (SET) leads to peculiar overheating effects. In particular, there is an interesting crossover interval where the competition between cotunneling and single-electron tunneling changes to the dominance of the latter. In this interval, the current exhibits anomalous sensitivity to the effective electron temperature of the transistor island and its fluctuations. We present a detailed study of the current and temperature fluctuations at this interesting point. The methods implemented allow for a complete characterization of the distribution of the fluctuating quantities, well beyond the Gaussian approximation. We reveal and explore the parameter range where, for sufficiently small transistor islands, the current fluctuations become gigantic. In this regime, the optimal value of the current, its expectation value, and its standard deviation differ from each other by parametrically large factors. This situation is unique for transport in nanostructures and for electron transport in general. The origin of this spectacular effect is the exponential sensitivity of the current to the fluctuating effective temperature.
description: 10 pages, 11 figures
Emergence of pygmy dipole resonances: Magic numbers and neutron skins
Creators: name: Inakura, Tsunenori
name: Nakatsukasa, Takashi
name: Yabana, Kazuhiro
Publisher: name: arXiv
Year: 2011
Subjects: subject: Nuclear Theory (nucl-th)
subject: FOS: Physical sciences

description: The pygmy dipole resonances (PDR) for even-even nuclei in 8=
description: 4 pages, 3 figures
Nonlocal mechanism for cluster synchronization in neural circuits
Creators: name: Kanter, I.
name: Kopelowitz, E.
name: Vardi, R.
name: Zigzag, M.
name: Kinzel, W.
name: Abeles, M.
name: Cohen, D.
Publisher: name: arXiv
Year: 2011
Subjects: subject: Chaotic Dynamics (nlin.CD)
subject: Neurons and Cognition (q-bio.NC)
subject: FOS: Physical sciences
subject: FOS: Biological sciences

description: The interplay between the topology of cortical circuits and synchronized activity modes in distinct cortical areas is a key enigma in neuroscience. We present a new nonlocal mechanism governing the periodic activity mode: the greatest common divisor (GCD) of network loops. For a stimulus to one node, the network splits into GCD-clusters in which cluster neurons are in zero-lag synchronization. For complex external stimuli, the number of clusters can be any common divisor. The synchronized mode and the transients to synchronization pinpoint the type of external stimuli. The findings, supported by an information mixing argument and simulations of Hodgkin Huxley population dynamic networks with unidirectional connectivity and synaptic noise, call for reexamining sources of correlated activity in cortex and shorter information processing time scales.
description: 8 pges, 6 figures
Disrupting the norms : towards new understandings of persistence and success in postsecondary education
Creators: name: Graydon Kelsall, Susan Beverley
Publisher: name: University of British Columbia
Year: 2015

description: The purpose of this research study was to explore longitudinally the academic outcomes and academic pathways of one cohort of students (N=790) in four general business diploma programs within one Ontario college. Informed by a life course perspective and utilizing the visual methodology of sequence analysis with optimal matching and cluster analysis, and discrepancy analysis, using R, the study maps individual student enrolment and achievement patterns beyond the expected time frame for graduation; presents diverse academic achievement measures including total courses enrolled, total courses passed, and course completion rate; and explores relationships between academic achievement measures and academic pathways, and student demographic, prior secondary school academic, and behavioural and academic characteristics related to the student-institution interaction at the time of entry. The study contributes to the research on postsecondary education student success in three ways. First, findings suggest the historical student success frameworks of Tinto (1975, 1993) and Metzner and Bean (1987) do not adequately represent the diverse academic pathways and outcomes for many students today. Second, the research supports Finnie, Childs, and Qui (2012) that reliance on student group level identification as a predictor of pathway or persistence is of limited use and therefore student success initiatives should be directed at individual students. Third, research findings suggest institutional and system structures and policies such as differentiation of enrolment status and curriculum and tuition fee structure may impede student success, particularly for those students whose lives do not align with the traditional and expected postsecondary education pathway. Although significant relationships were found between some of the student characteristics and individual academic outcomes and pathways, the effect size of these relationships is too small to be helpful from either a practical or a policy perspective to differentiate in advance students who will be successful under traditional measures and those who will not. Results suggest that early educational trajectories do not determine later ones and the transition into postsecondary education has the potential to alter prior pathways. The study also highlights the usefulness and challenges of utilizing historical institutional administrative student-level data.
Excitonic effects in twisted bilayer graphene
Creators: name: Apinyan, V.
name: Kopeć, T. K.
Publisher: name: arXiv
Year: 2022
Subjects: subject: Mesoscale and Nanoscale Physics (cond-mat.mes-hall)
subject: Strongly Correlated Electrons (cond-mat.str-el)
subject: FOS: Physical sciences

description: In the present work, we consider the excitonic effects in the twisted bilayer graphene (tBLG) within the rotated bilayer Hubbard model. Both, intralayer and interlayer Coulomb interactions have been considered and the half-filling condition is imposed for the electronic densities is both layers of the bilayer. We calculate the excitonic pairing gap parameter and the chemical potential for different twist angles and different values of the interlayer Coulomb interaction parameter. Furthermore, we show the appearance of the electronic flat bands in the electronic band structure, mediated by the excitonic effects. We show that there is a doubling effect of the Dirac's $K$-point at the low interaction limit and one of Dirac's nodes is stable and the other one changes its position as a function of rotation angle. At the large twist angle limit, there appear two additional Dirac-like nodes at the $M$-point in the Brillouin zone. We show the excitonic red-shift effect of the principal Dirac's point $K$, in the low interaction limit, while, at the strong interactions, we get also the blue-shift effect at the $M$-point. Apart from the mentioned effects, the theory evaluated here predicts a metal-semiconductor transition in the tBLG system when augmenting the interlayer Coulomb interaction parameter.
description: 16 pages, 12 Figures