cometadata/datacite-rtg-text-other-reclassification-records huggingface dataset:
Who Do You Think You Are?: Reflections on direct-to-consumer genetic testing
Creators: name: Willmott, Chris
name: Macip, Salvador
Publisher: name: University of Leicester
Year: 2020
Subjects: subject: 60408 Genomics
subject: FOS: Biological sciences

description: This is an introduction to the ethical issues arising from the rise in "Direct to Consumer" genetic testing. It is provided in the format of a discussion (telephone call and email exchange) between a research scientist and his clinician friend.
This is a sample chapter from 'What Future Will Our Children Have? Conversations about how science is changing our lives'. [ ISBN - 13: 978-8497666923]
Mg impurity in helium droplets
Creators: name: Navarro, J.
name: Mateo, D.
name: Barranco, M.
name: Sarsa, A.
Publisher: name: arXiv
Year: 2011
Subjects: subject: Other Condensed Matter (cond-mat.other)
subject: Atomic and Molecular Clusters (physics.atm-clus)
subject: FOS: Physical sciences

description: Within the diffusion Monte Carlo approach, we have determined the structure of isotopically pure and mixed helium droplets doped with one magnesium atom. For pure 4He clusters, our results confirm those of M. Mella et al. [J. Chem. Phys. 123, 054328 (2005)] that the impurity experiences a transition from a surface to a bulk location as the number of helium atoms in the droplet increases. Contrarily, for pure 3He clusters Mg resides in the bulk of the droplet due to the smaller surface tension of this isotope. Results for mixed droplets are presented. We have also obtained the absorption spectrum of Mg around the 3s3p 1P_1
description: 30 pages, 11 figures, 5 tables
Simulation of protected area and forestry cutblock design in the boreal plain ecoregion
Creators: name: Fauvelle, Catherine
Publisher: name: Environmental Design
Year: 2017
Subjects: subject: Landscape Architecture
subject: Urban and Regional Planning
subject: FOS: Social and economic geography
subject: Forestry and Wildlife
subject: Ecology
subject: FOS: Biological sciences
subject: conservation planning and management
subject: forestry harvest
subject: boreal plain ecoregion

description: Spatial and statistical analyses are becoming more commonplace in planning for conservation and land-use programs. I used specific spatial and statistical analyses to examine their potential for answering questions posed by stakeholders in the boreal plain ecoregion regarding the strategic placement of protected areas and forestry cutblocks on the retention of ecological integrity. I found that neither strategic placement nor size significantly affect the retention of ecological integrity within protected areas. Additionally, I found that clustering new forestry cutblocks near existing disturbances did not significantly affect the loss of connectivity, though doubling the expected area of harvest did increase the loss of certain connectivity metrics. The conclusions drawn from this thesis are relevant to landscape planners and conservation managers, but should be paired with the results of biological studies to better represent the reality of complex ecosystems.
Effect of Solar Pv Plants on the Dispatchability of Power in the ZESCO System
Creators: name: Evans Njalamimba Musonda*
name: Mabvuto Mwanza
Publisher: name: Zenodo
Year: 2025
Subjects: variable renewable energy; power plant dispatchability; generation costs; battery energy storage system (BESS), intermittent, solar photo voltaic, DigSilent Power factory.

description: Abstract: This paper examines the impact of integrating solar photovoltaic (PV) plants into Zambia's national grid, with a particular focus on dispatchability within the ZESCO grid. The energy crisis due to climate change has forced Zambia to diversify its energy mix, which is currently dominated by hydropower at 86%. Variability in dispatchability, due in part to the integration of solar PV, presents a challenge to energy systems. Using DIgSILENT Power Factory software, this study performs both steady-state and transient stability analyses to determine transmission adequacy, voltage-frequency stability, and reserve requirements under increased penetration levels of solar photovoltaic (PV) energy. In fact, the results show that integrating solar PV near load centers reduces transmission line loading from hydropower stations, line losses, and improves voltage profiles along the network. However, ZESCO currently faces a shortfall in operating reserve, requiring an additional 82 MW for system regulation. With proper planning, the integration of solar PV will provide economic benefits that outweigh the costs; hence, it makes Zambia's energy system more resilient and diversified.
Comunicação e Autoridade nas Empresas
Creators: name: Gomes, Orlando
Publisher: name: SOPCOM: Associação Portuguesa de Ciências da Comunicação
Year: 2005

description: Quem detém, na prática, o poder numa empresa? Em que sentido uma comunicação eficiente entre níveis hierárquicos é importante para o exercício da autoridade? De que modo comunicação e delegação de poderes podem ser encarados como substitutos na gestão da actividade produtiva? A estas três questões genéricas responde-se neste texto de dois modos: primeiro, através de uma revisão da literatura recente associada à teoria da empresa, onde se revela o desencontro que poderá existir entre propriedade e exercício da autoridade, e onde também se destaca a relação entre grau de eficiência na comunicação entre níveis hierárquicos e a extensão da delegação de autoridade; segundo, através da construção de uma estrutura analítica simples onde o resultado óptimo no que concerne aos objectivos da empresa está dependente do conjunto de factores que determinam decisões sobre maior ou menor delegação de poderes.
description: SOPCOM: Associação Portuguesa de Ciências da Comunicação, 2005: 4º SOPCOM: “Repensar os Media: Novos Contextos da Comunicação e da Informação”
Vortex-type elastic structured media and dynamic shielding
Creators: name: Brun, Michele
name: Jones, Ian S.
name: Movchan, Alexander B.
Publisher: name: arXiv
Year: 2012
Subjects: subject: Mathematical Physics (math-ph)
subject: Classical Physics (physics.class-ph)
subject: FOS: Physical sciences

description: The paper addresses a novel model of metamaterial structure. A system of spinners has been embedded into a two-dimensional periodic lattice system. The equations of motion of spinners are used to derive the expression for the chiral term in the equations describing the dynamics of the lattice. Dispersion of elastic waves is shown to possess innovative filtering and polarization properties induced by the vortextype nature of the structured media. The related homogenised effective behavior is obtained analytically and it has been implemented to build a shielding cloak around an obstacle. Analytical work is accompanied by numerical illustrations.
description: 24 pages, 13 figures
AtlantisBPnet: um projecto em busca das boas práticas da Sociedade da Informação e da Comunicação nos países do espaço atlântico
Creators: name: Campos, Sónia
name: Silva, Lídia Oliveira
name: Duarte, A. Manuel De Oliveira
Publisher: name: SOPCOM: Associação Portuguesa de Ciências da Comunicação
Year: 2005

description: Nos dias que correm a evolução económica e social está dependente do desenvolvimento, implementação e uso das tecnologias da informação e comunicação (TIC). Fruto desse desenvolvimento, implementação e uso sentem-se, hoje, efeitos marcantes em várias áreas de actividade, como por exemplo: trabalho, educação, saúde, ambiente, entretenimento, governo, economia, etc.. Outros efeitos ainda mais intensos parecem avizinhar-se. Importa, assim, que cada país ou região desenvolva estratégias e projectos que consigam responder aos desafios impostos por esta Sociedade emergente. No entanto, umas estratégias e projectos darão melhores resultados que outros, podendo, por isso, ser consideradas boas práticas. Mas o que é e como identificar uma boa prática na Sociedade da Informação? O projecto AtlantisBPnet está a desenvolver uma metodologia de identificação e análise de boas práticas da Sociedade da Informação, pelo que poderá contribuir para uma reflexão sobre a problemática anteriormente referida. O propósito deste artigo é, então, o de dar conta do trabalho em curso neste projecto relativo à problemática da identificação das boas práticas da Sociedade da Informação e sua disseminação.
description: SOPCOM: Associação Portuguesa de Ciências da Comunicação, 2005: 4º SOPCOM: “Repensar os Media: Novos Contextos da Comunicação e da Informação”
Impacts of individual transferable quotas in Canadian sablefish fisheries : an economic analysis
Creators: name: Soliman, Adam
Publisher: name: University of British Columbia
Year: 2010

description: In 1990, the Department of Fisheries and Oceans implemented the Individual Transferable Quotas (ITQ) system to achieve its management goals. The purpose of this study is to investigate the effectiveness of this system. It aims to determine whether and how the ITQ system creates an economically viable industry; what problems the ITQ system has generated and what factors should be considered in addressing them; and what the risk of holding these quotas is to the fisher. To this end, I will focus on efficiency as a critical dimension of economic viability and the fisher’s competitiveness. I will begin by comparing the ITQ to the Limited Entry system which preceded it and explore claims regarding the impact of ITQs on the sustainability and viability of fishing firms and the sablefish fishery. Next, I will conduct a detailed and comprehensive analysis of the industry’s cost structure that highlights the value/purchase price of the quota, which is widely considered to be a crude measure of industry profitability. This analysis will examine Barichello’s (1996) model in order to calculate the risk associated with holding sablefish quotes and Monk and Pearson’s (1989) Policy Analysis Matrix (PAM) in order to determine whether the sablefish industry is efficient. I will then source industry information to compute the costs of fishing by conducting a financial analysis of firms that are representative of the sablefish fishery. The cost structure presented in the financial analysis will be utilized to apply the PAM to the sablefish fishery, which will determine whether it is efficient and if the ITQ system has created a highly subsidized industry. My analyses will demonstrate that the industry is economically viable under the ITQ system and that if the ITQ system was meant to correct market failures in the sablefish industry, it has partially succeeded in doing so. Key findings will be related to criticisms of ITQs and the implications of these findings will be considered. Lastly, I will detail the questions that the research has raised and make recommendations for future research.
A nova regulação dos Media
Creators: name: Silva, Manuel José Lopes Da
Publisher: name: SOPCOM: Associação Portuguesa de Ciências da Comunicação
Year: 2005

description: Os complexos problemas suscitados pelos actuais sistemas baseados nas NTIC, que se caracterizam por ter uma expressão Global são analisados nos domínios económico, sociológico e político. Uma vez que o sistema de Regulação ainda vigente se revelou incapaz de assegurar o cumprimento pelos Media de regras que respeitem os interesses e os valores da Sociedade, há que procurar novos processos de responsabilização. A Governança dos Media é o novo conceito surgido na área do Poder que estabelece um novo relacionamento entre a Sociedade e os Media que a devem servir. (...)
description: SOPCOM: Associação Portuguesa de Ciências da Comunicação, 2005: 4º SOPCOM: “Repensar os Media: Novos Contextos da Comunicação e da Informação”
Investigation of Polymeric Composites with High Aspect Ratio Nanoparticulates for Coatings
Creators: name: TabkhPaz Sarabi, Majid
Publisher: name: Graduate Studies
Year: 2016
Subjects: subject: Engineering--Mechanical
subject: Polymer
subject: Coating
subject: Nanomaterials
subject: Composites
subject: Mixing
subject: Modeling
subject: Random walk
subject: Pipeline
subject: Corrosion
subject: Carbon nanotubes
subject: Graphene

description: To overcome some of the challenges associated with existing pipeline coatings, the use of polymeric nanocomposites as coating materials are proposed in this research. By employing novel inclusions such as hexagonal boron nitride (hBN) nanoplatelets, carbon nanotubes (CNTs), graphene nanoplatelets (GNPs), and zinc particulates within a conventional polymer coating, high-performance polymeric nanocomposites can be created for the purposes of pipeline protection. The excellent performances of the proposed polymer-based composites are due to unique mechanical, electrical, thermal, and anti-corrosive properties of the additives. The addition of 2D nanoplatelets such as hBN and GNP to the pure polymers may result in the fabrication of nanocomposites with lower coefficient of thermal expansion (CTE), high gas barrier, high mechanical stability, and anti-corrosive performances. Application of CNTs and zinc particles as hybrid compositions can also improve corrosion protection of the composite coatings due to the synergistic effects of zinc particles as sacrificial material and CNTs as connectors of an electrically conductive network. This research is aimed at investigating the feasibility of using these nanocomposites as coating materials. Initially, the effects of dispersion and geometry of CNTs on the final properties of nanocomposites were examined. Then, two random walk models were developed to study the effects of the addition of inclusions on the electrical and thermal conductivities of nanocomposites. Finally, the selected nanoparticulates were added to polymers, and the coating capabilities of composites were evaluated. From the tests and investigations conducted on the developed composite coatings, it was observed that thermal expansion, gas barrier, mechanical strength, adhesion, and corrosion protection performances were improved compared to the pure polymeric coatings. The corroded area on the cathodic disbondment test specimens reduced down up to 90% for the composite with zinc (20 wt.%), MWCNTs (2 wt.%), and GNPs (2 wt.%), compared to a specimen coated with a pure polymer. It is seen that the presence of nanoparticulates decreased gas penetration and thermal expansion of the matrix by 75% and 65%, respectively.
Library Show and Tell: Digital Tuesdays Workshops Autumn 2020
Creators: name: Groves, Antony
name: Corble, Alice
name: Heavey, Nicholas
Publisher: name: University of Sussex
Year: 2020
Subjects: subject: Library and Information Studies
subject: FOS: Media and communications

description: The Digital Tuesdays workshops run each week throughout term and are delivered by colleagues in the Library, Technology Enhanced Learning, IT Services and beyond. The workshops are open to the whole academic community at Sussex and provide digital skills training for students, researchers and staff.
The programme takes inspiration from Jisc’s ‘Building digital capability’ service, designed to help staff and students thrive in a digital world (https://www.jisc.ac.uk/building-digital-capability).
Starting during the final week of 2020’s extended induction, the Autumn programme was delivered entirely online through a combination of synchronous and asynchronous training. This included Zoom webinars, LinkedIn Learning pathways and more.
The aim is to be responsive and to make sessions as timely, relevant and helpful to students as possible. In Autumn 2020 this included Library staff delivering training about ‘Browsing the regular web anonymously using Tor’ (to address the concerns of some staff and students working overseas); ‘Social media data collection for researchers’ (where we see student projects at all levels); and ‘Creating posters with Canva’ (posters being a mode of assessment in some departments).
These workshops are also scheduled to tie-in with wider academic events at Sussex (e.g. Academic Skills Week in Oct and Digital Discovery Week in Nov), and broader global initiatives (e.g. Open Access Week in Oct and Computer Science Education Week in Dec).
To provide continuing guidance and support on these topics beyond the week that training is delivered; past presentations, videos and resources remain available on the Digital Tuesdays section of the Skills Hub.
Economia e Políticas da Comunicação
Creators: name: Braumann, Pedro Jorge
name: Sousa, Helena
Publisher: name: SOPCOM: Associação Portuguesa de Ciências da Comunicação
Year: 2005

description: Este texto introdutório à Sessão Paralela de Economia e Políticas da Comunicação pretende dar conta da importância desta área científica. Será feita uma breve apresentação sobre o seu estado actual, em Portugal, incluindo o papel – que entendemos ser de relevo da SOPCOM no seu desenvolvimento. Por fim, serão esboçadas as principais ideias das comunicações que serão apresentadas e discutidas no IV Congresso da associação.
description: SOPCOM: Associação Portuguesa de Ciências da Comunicação, 2005: 4º SOPCOM: “Repensar os Media: Novos Contextos da Comunicação e da Informação”
Constraining Type Ia supernova models: SN 2011fe as a test case
Creators: name: Roepke, F. K.
name: Kromer, M.
name: Seitenzahl, I. R.
name: Pakmor, R.
name: Sim, S. A.
name: Taubenberger, S.
name: Ciaraldi-Schoolmann, F.
name: Hillebrandt, W.
name: Aldering, G.
name: Antilogus, P.
name: Baltay, C.
name: Benitez-Herrera, S.
name: Bongard, S.
name: Buton, C.
name: Canto, A.
name: Cellier-Holzem, F.
name: Childress, M.
name: Chotard, N.
name: Copin, Y.
name: Fakhouri, H. K.
name: Fink, M.
name: Fouchez, D.
name: Gangler, E.
name: Guy, J.
name: Hachinger, S.
name: Hsiao, E. Y.
name: Juncheng, C.
name: Kerschhaggl, M.
name: Kowalski, M.
name: Nugent, P.
name: Paech, K.
name: Pain, R.
name: Pecontal, E.
name: Pereira, R.
name: Perlmutter, S.
name: Rabinowitz, D.
name: Rigault, M.
name: Runge, K.
name: Saunders, C.
name: Smadja, G.
name: Suzuki, N.
name: Tao, C.
name: Thomas, R. C.
name: Tilquin, A.
name: Wu, C.
Publisher: name: arXiv
Year: 2012
Subjects: subject: Solar and Stellar Astrophysics (astro-ph.SR)
subject: FOS: Physical sciences

description: The nearby supernova SN 2011fe can be observed in unprecedented detail. Therefore, it is an important test case for Type Ia supernova (SN Ia) models, which may bring us closer to understanding the physical nature of these objects. Here, we explore how available and expected future observations of SN 2011fe can be used to constrain SN Ia explosion scenarios. We base our discussion on three-dimensional simulations of a delayed detonation in a Chandrasekhar-mass white dwarf and of a violent merger of two white dwarfs-realizations of explosion models appropriate for two of the most widely-discussed progenitor channels that may give rise to SNe Ia. Although both models have their shortcomings in reproducing details of the early and near-maximum spectra of SN 2011fe obtained by the Nearby Supernova Factory (SNfactory), the overall match with the observations is reasonable. The level of agreement is slightly better for the merger, in particular around maximum, but a clear preference for one model over the other is still not justified. Observations at late epochs, however, hold promise for discriminating the explosion scenarios in a straightforward way, as a nucleosynthesis effect leads to differences in the 55Co production. SN 2011fe is close enough to be followed sufficiently long to study this effect.
description: Accepted for publication in The Astrophysical Journal Letters
A relação eu/tu: a universalidade do agir
Creators: name: Gama, Maria Gabriela
Publisher: name: SOPCOM: Associação Portuguesa de Ciências da Comunicação
Year: 2005

description: As novas tecnologias desenvolveram condições práticas de existência tão vertiginosas que o homem nunca equacionou. Simultaneamente, anuncia-se o nascimento de uma nova sociedade onde a questão da interacção social também é afectada, uma vez que esses sistemas são eles próprios lugares de interacção do indivíduo. Procurámos mostrar que existem razões que nos levam a relativizar o optimismo generalizado que todos hoje aparentam: hoje, vivemos num mundo em que coexistem uma prosperidade como jamais a espécie humana alcançou, ao lado da miséria e da privação mais extrema. O que significa que as possibilidades tecnológicas de aceder ao desenvolvimento são absolutamente desproporcionadas. Aldeia global? Sim, mas onde? Tentámos, ainda que de modo resumido, responder a três questões: a sociedade da comunicação coaduna-se com a construção de uma sociedade mais humana? Mais justa? A urgência de uma ética da responsabilidade constitui um ponto fundamentador da nossa reflexão, mostrando que esta ultrapassa a dimensão da reflexão filosófica estrita, para se colocar num âmbito mais lato. A questão ética seria talvez menos pertinente, se fossemos habitantes solitários do planeta; mas a realidade é que vivemos homens entre os homens, uns com os outros e, neste contexto, a escolha do que nos convém e do que nos propicia uma vida colectiva mais harmoniosa torna-se uma questão mais complexa e delicada. (...)
description: SOPCOM: Associação Portuguesa de Ciências da Comunicação, 2005: 4º SOPCOM: “Repensar os Media: Novos Contextos da Comunicação e da Informação”
A single-dish survey of the HCO+, HCN, and CN emission toward the T Tauri disk population in Taurus
Creators: name: Salter, D. M.
name: Hogerheijde, M. R.
name: van der Burg, R. F. J.
name: Kristensen, L. E.
name: Brinch, C.
Publisher: name: arXiv
Year: 2011
Subjects: subject: Astrophysics of Galaxies (astro-ph.GA)
subject: FOS: Physical sciences

description: (Abridged) As the stellar X-ray and UV light penetration of a protoplanetary disk depends sensitively on the dust properties, trace molecular species like HCO+, HCN, and CN are expected to show marked differences from photoprocessing effects as the dust content in the disk evolves. We investigate the evolution of the UV irradiation of the molecular gas in a sample of classical T Tauri stars in Taurus that exhibit a wide range in grain growth and dust settling properties. We obtained HCO+ (J=3-2), HCN (J=3-2), and CN (J=2-1) observations of 13 sources with the JCMT. Our sample has 1.3mm fluxes in excess of 75mJy, indicating the presence of significant dust reservoirs; a range of dust settling as traced through their spectral slopes between 6, 13, and 25 microns; and varying degrees of grain growth as extrapolated from the strength of their 10-micron silicate emission features. We compare the emission line strengths with the sources' continuum flux and infrared features, and use detailed modeling based on two different model prescriptions to compare typical disk abundances for HCO+, HCN, and CN with the gas-line observations for our sample. We detected HCO+ (3-2) toward 6 disks, HCN (3-2) from 0 disks, and CN (2-1) toward 4 disks. For the complete sample, there is no correlation between the gas-line strengths or their ratios and either the sources' dust continuum flux or infrared slopes.
description: Accepted for publication in A&A, 19 pages, 13 figures
Band gap control via tuning of inversion degree in CdIn$_2$S$_4$ spinel
Creators: name: Seminóvski, Yohanna
name: Palacios, Pablo
name: Wahnón, Perla
name: Grau-Crespo, Ricardo
Publisher: name: arXiv
Year: 2012
Subjects: subject: Materials Science (cond-mat.mtrl-sci)
subject: Statistical Mechanics (cond-mat.stat-mech)
subject: Chemical Physics (physics.chem-ph)
subject: Computational Physics (physics.comp-ph)
subject: FOS: Physical sciences

description: Based on theoretical arguments we propose a possible route for controlling the band-gap in the promising photovoltaic material CdIn$_2$S$_4$. Our \textit{ab initio} calculations show that the experimental degree of inversion in this spinel (fraction of tetrahedral sites occupied by In) corresponds approximately to the equilibrium value given by the minimum of the theoretical inversion free energy at a typical synthesis temperature. Modification of this temperature, or of the cooling rate after synthesis, is then expected to change the inversion degree, which in turn sensitively tunes the electronic band-gap of the solid, as shown here by accurate screened hybrid functional calculations.
description: In press in Applied Physics Letters (2012); 4 pages, 2 figures, 1 table
La Publicidad en el siglo XXI: una referencia a la Ética Empresarial
Creators: name: Galán–Ladero, Mª De Las Mercedes
name: Sánchez–Hernández, Mª Isabel
Publisher: name: SOPCOM: Associação Portuguesa de Ciências da Comunicação
Year: 2005

description: El mundo de la publicidad presenta rasgos comunes en todas las economías occidentales. Los modelos de negocio que prevalecen en España son similares, en su esencia, a los de otros países de su entorno y, consecuentemente, podríamos decir que, en general, las campañas publicitarias no difieren mucho de unas naciones a otras. (...)
description: SOPCOM: Associação Portuguesa de Ciências da Comunicação, 2005: 4º SOPCOM: “Repensar os Media: Novos Contextos da Comunicação e da Informação”
Robust Temperature-Based Optimization for Global Routing
Creators: name: Samimi, Bardia
Publisher: name: Graduate Studies
Year: 2012
Subjects: subject: Engineering--Electronics and Electrical
subject: VLSI
subject: Robust Optimization
subject: Global Routing
subject: Temperature-Based
subject: Overflow

description: Global routing is one of the significant steps in designing Very Large-Scaled Integrated (VLSI) circuits. It determines the geometric locations of the connections between elements of a circuit. In this thesis, a new method is proposed to consider the temperature factor in finding a routing solution in the global routing stage. Hot regions can affect the performance of a circuit. It can cause malfunctioning or failure. The proposed temperature based model reduces the temperature in the hot regions by spreading the heat over cooler regions, resulting in a cooler circuit. For a circuit, the temperature does not remain constant over time. A robust method is proposed to take into account the changes in the temperature of the circuits. In addition, runtime for global routing is initially high due to the nature of the problem. A method is introduced to reduce the overall runtime of the proposed global routing methods.
Binary-induced magnetic activity? Time-series echelle spectroscopy and photometry of HD123351 = CZ CVn
Creators: name: Strassmeier, K. G.
name: Carroll, T. A.
name: Weber, M.
name: Granzer, T.
name: Bartus, J.
name: Olah, K.
name: Rice, J. B.
Publisher: name: arXiv
Year: 2011
Subjects: subject: Solar and Stellar Astrophysics (astro-ph.SR)
subject: FOS: Physical sciences

description: We present a first and detailed study of the bright and active K0IV-III star HD 123351. The star is found to be a single-lined spectroscopic binary with a period of 147.8919+-0.0003 days and a large eccentricity of e=0.8086+-0.0001. The rms of the orbital solution is just 47 m/s, making it the most precise orbit ever obtained for an active binary system. The rotation period is constrained from long-term photometry to be 58.32+-0.01 days. It shows that HD 123351 is a very asynchronous rotator, rotating five times slower than the expected pseudo-synchronous value. Two spotted regions persisted throughout the 12 years of our observations. Four years of Halpha, CaII H&K and HeI D3 monitoring identifies the same main periodicity as the photometry but dynamic spectra also indicate that there is an intermittent dependence on the orbital period, in particular for Ca ii H&K in 2008. Line-profile inversions of a pair of Zeeman sensitive/insensitive iron lines yield an average surface magnetic-flux density of 542+-72 G. The time series for 2008 is modulated by the stellar rotation as well as the orbital motion, such that the magnetic flux is generally weaker during times of periastron and that the chromospheric emissions vary in anti-phase with the magnetic flux. We also identify a broad and asymmetric lithium line profile and measure an abundance of log n(Li) = 1.70+-0.05. The star's position in the H-R diagram indicates a mass of 1.2+-0.1 Msun and an age of 6-7 Gyr. We interpret the anti-phase relation of the magnetic flux with the chromospheric emissions as evidence that there are two magnetic fields present at the same time, a localized surface magnetic field associated with spots and a global field that is oriented towards the (low-mass) secondary component.
title: The Human Efficiency Evaluator
title: A tool to predict and explore monitoring behaviour
titleType: AlternativeTitle
Creators: name: Feuerstack, Sebastian
name: Wortelen, Bertram
Publisher: name: DuEPublico: Duisburg-Essen Publications Online, University of Duisburg-Essen, Germany
Year: 2017
Subjects: Visual Attention
Human Factors
Supervisory Control
Software-supported method
Cognitive Modeling
Safety

description: With more and more systems and machines operating autonomously, the role of the operator is changing from “being actively in control” to “monitor and intervene”. Human Machine Interfaces (HMI) therefore need to be optimized so that they can efficiently be monitored by a human. We propose the Human Efficiency Evaluator (HEE), a software tool for (1) evaluating the impact of HMI design changes on the visual monitoring behavior of the operator and (2) to explore differences in understandings between a group of collaborating HMI designers or between HMI designers and their targeted audience: the operators. We describe the tool and highlight the model exploration capabilities of the HEE by reporting about two use cases: one in the maritime domain, in which the tool supported an HMI designer to get insights into human operators’ monitoring behavior, and one in the automotive domain, in which the tool was used to reveal differences in understanding between six Human Factor Experts about the impact of three HMI design variants of an Urban ACC.
Contributions to a Context-Aware High Sensitivity GNSS Software Receiver
Creators: name: Lin, Tao
Publisher: name: Graduate Studies
Year: 2013
Subjects: subject: General
subject: GNSS
subject: high-sensitivity
subject: receiver

description: GNSS have established themselves as the dominant positioning technology to provide location and navigation solutions with high reliability and accuracy with low-cost portable user devices. However, receiver performance can be significantly affected by operational environments. High attenuation and severe multipath fading degrade the signal tracking performance and limit the use of GNSS in indoor and urban environments. Therefore, this thesis focuses on enhancements of a context-aware high sensitivity software GNSS receiver. To improve the GNSS signal tracking sensitivity, three levels of effort have been made. Firstly, four signal integrators, namely bit aiding coherent integrator, bit extracting coherent integrator, magnitude non-coherent integrator and squaring non-coherent integrator are developed and tested in the high sensitivity GNSS software receiver GSNRx-hsTM to increase the processing gain. While bit aiding coherent integrator utilizes time-tagged external data bit aiding, others do not require external data bit aiding. Secondly, three multi-correlator based frequency estimators, namely the FFT-based maximum-likelihood frequency estimator, the fast-slow frequency discriminator and the power-based frequency discriminator, are developed to improve the weak carrier tracking. Simulations show that these frequency estimators can provide about 4 to 5 dB gain compared to the traditional phase-different discriminators. The third effort is the development of the centralized vector-based tracking loops, the decentralized vector-based tracking loop, and the navigation-domain tracking loop. Using a GPS only constellation, it is shown that vector tracking can provide 2 to 6 dB improvements over scalar tracking. From tests with hardware simulated data, even without data bit aiding, the developed centralized and decentralized vector-based tracking loops with the multi-correlator frequency discriminator and the navigation-domain tracking loops can track signals as low as 8 dB-Hz. Field test conducted in a typical North American house shown that the centralized vector-based tracking loop and the scalar-based tracking loop can successfully track signals in a basement and provide metre-level position. As the high sensitivity tracking techniques developed herein are different from conventional tracking methods, metrics that can be used to indicate the environment change and allow the receiver to have context-awareness are proposed and explored. From experiments conducted in residential homes, it is found that the sole use of C/N0 values to detect the transition between outdoors and indoors is optimistic; in contrast, it is found that the Ricean K-factor, can detect outdoor-to-indoor transitions by capturing the C/N0 variation due to multipath fading and allow the receiver to adjust the processing strategy before the transition happen.
Direito e Ética da Comunicação
Creators: name: Carvalho, Alberto Arons De
Publisher: name: SOPCOM: Associação Portuguesa de Ciências da Comunicação
Year: 2005

description: A revolução tecnológica verificada nos últimos anos no sector da comunicação social tem obrigado os Estados e as organizações internacionais a produzirem abundante legislação, visando dar resposta aos complexos problemas que se suscitam. Ao mesmo tempo, o poder adquirido pelos media na sociedade contemporânea conduziu-a uma acrescida protecção dos direitos da personalidade, centrada em bens jurídicos autonomizados como a imagem, a palavra ou a reserva da vida privada e familiar. (...)
description: SOPCOM: Associação Portuguesa de Ciências da Comunicação, 2005: 4º SOPCOM: “Repensar os Media: Novos Contextos da Comunicação e da Informação”
Thermal width and gluo-dissociation of quarkonium in pNRQCD
Creators: name: Brambilla, Nora
name: Escobedo, Miguel Angel
name: Ghiglieri, Jacopo
name: Vairo, Antonio
Publisher: name: arXiv
Year: 2011
Subjects: subject: High Energy Physics - Phenomenology (hep-ph)
subject: High Energy Physics - Lattice (hep-lat)
subject: Nuclear Theory (nucl-th)
subject: FOS: Physical sciences

description: The thermal width of heavy-quarkonium bound states in a quark-gluon plasma has been recently derived in an effective field theory approach. Two phenomena contribute to the width: the Landau damping phenomenon and the break-up of a colour-singlet bound state into a colour-octet heavy quark-antiquark pair by absorption of a thermal gluon. In the paper, we investigate the relation between the singlet-to-octet thermal break-up and the so-called gluo-dissociation, a mechanism for quarkonium dissociation widely used in phenomenological approaches. The gluo-dissociation thermal width is obtained by convoluting the gluon thermal distribution with the cross section of a gluon and a 1S quarkonium state to a colour octet quark-antiquark state in vacuum, a cross section that at leading order, but neglecting colour-octet effects, was computed long ago by Bhanot and Peskin. We will, first, show that the effective field theory framework provides a natural derivation of the gluo-dissociation factorization formula at leading order, which is, indeed, the singlet-to-octet thermal break-up expression. Second, the singlet-to-octet thermal break-up expression will allow us to improve the Bhanot--Peskin cross section by including the contribution of the octet potential, which amounts to include final-state interactions between the heavy quark and antiquark. Finally, we will quantify the effects due to final-state interactions on the gluo-dissociation cross section and on the quarkonium thermal width.
description: 17 pages, 6 figures
Uma abordagem exploratória à receptividade da opinião publicada em Portugal
Creators: name: Barriga, Antónia Anjinho
Publisher: name: SOPCOM: Associação Portuguesa de Ciências da Comunicação
Year: 2005

description: Esta comunicação pretende dar conta de alguns resultados preliminares apurados no âmbito de uma investigação em curso 1 que pretende abordar sociologicamente a opinião publicada na imprensa de referência portuguesa e que se propõe perceber: 1-qual é o papel dos artigos de opinião na construção das representações sobre a política nacional;2-como é percepcionada a opinião por quem a emite; 3-qual a receptividade que opinião obtém por parte dos leitores. É sobre este último ponto que aqui nos propomos reflectir. Para tal, traremos a debate alguns pressupostos e contributos que passam pelos modelos actuais de explicação dos efeitos da comunicação de massas; e apresentaremos alguns resultados obtidos na pesquisa empírica.
description: SOPCOM: Associação Portuguesa de Ciências da Comunicação, 2005: 4º SOPCOM: “Repensar os Media: Novos Contextos da Comunicação e da Informação”
Externally-driven transformations of vortex textures in flat submicrometer magnets
Creators: name: Janutka, Andrzej
Publisher: name: arXiv
Year: 2012
Subjects: subject: Mesoscale and Nanoscale Physics (cond-mat.mes-hall)
subject: FOS: Physical sciences

description: Two effects of oscillatory transformations of vortex textures in flat nanomagnets due to the application of an external field or a spin-polarized electric current are analytically described with relevance to soft-magnetic structures of submicrometer sizes (whose thickness is significantly bigger than the magnetostatic exchange length). These are changes of a domain wall (DW) structure in a long magnetic stripe (oscillations between a transverse DW, a vortex DW, and an antivortex DW) and periodic vortex-core reversals in a circular magnetic dot which are accompanied by oscillatory displacements of the vortex from the dot center. In nanostructures of smaller thicknesses (comparable to the exchange length), where nonlocal magnetostatic effects are very strong because of fast spatial variation of the magnetization, similar phenomena have been widely studied previously. Here, the dynamics is investigated within a local approach including magnetostatic field via boundary conditions on solutions to the Landau-Lifshitz-Gilbert equation only. Both the DWs in stripes and vortex states of the dot are treated as fragments of a cross-tie DW. Despite similarity of the cyclic transformations of the ordering to the dynamics of more strongly confined nanomagnets, details of motion (trajectories) of the vortices and antivortices (Bloch lines) of the textures under study are different, which is related to prohibition of rapid jumps of the polarization of Bloch lines. In addition to the magnetization rotation about the direction of magnetic field or current polarization, the evolution of textures is shown to relate to oscillatory changes of the direction of a cross-tie DW with respect to any arbitrary axis in the magnet plane accompanied by oscillations of the DW width.
Activity of and resistance to cationic antimicrobial agents in Pseudomonas aeruginosa
Creators: name: Kindrachuk, Kristen Nicole
Publisher: name: University of British Columbia
Year: 2010

description: This thesis investigates mechanisms of adaptive resistance to the cationic antimicrobial agents tobramycin and polymyxin B in the opportunistic pathogen Pseudomonas aeruginosa. Using a comprehensive mutant library of P. aeruginosa to screen for genes capable of affecting tobramycin susceptibility, 135 genes were identified that caused increased resistance when insertionally inactivated. Transcriptional profiling studies demonstrated downregulation of 53 of these genes in response to tobramycin and significant up-regulation of a number of heat shock genes including an alternative lon protease, AsrA. Induced expression of asrA in trans demonstrated its ability to induce heat shock genes in the absence of tobramycin and also provided protection against tobramycin in the first hour after exposure to a lethal dose of 4 μg/ml. Upregulation of the known efflux pump MexXY was observed after prolonged exposure to sub-inhibitory concentrations of tobramycin but induction of this operon was not observed as part of the immediate response to lethal concentrations of tobramycin. When investigating susceptibility testing methods for polymyxins, 24 P. aeruginosa clinical isolates were observed to have a distinct, reproducible phenotype in which skipped wells were observed during microbroth dilution testing for polymyxin B. Possible mechanisms underlying this phenotype were investigated in two of these isolates and one isolate demonstrating a constitutive resistance phenotype. The effects of varying concentrations of polymyxin B on growth, on expression of the resistance genes phoQ, arnB and PA4773 (pmrAB operon), and on outer membrane permeability were assessed. The isolates presenting the skipped well phenotype demonstrated adaptations in growth, gene expression and membrane permeabilization in response to specific concentrations of polymyxin B consistent with the involvement of Lipid A modifications in the adaptive resistance phenotype. The results of this thesis highlight the complexity of the bacterial response to cationic antimicrobial agents, as we have demonstrated that adaptation conferring immediate protection (induction of heat shock) differs from that providing long term protection (induction of efflux and Lipid A modifications). Furthermore, the regulatory systems involved in conferring resistance through Lipid A modifications, PhoPQ and PmrAB, are complex and may vary between strains as they adapt further to the pressures imposed by antimicrobial treatment.
Oceanic storm surges in the outer Mackenzie Delta, NWT Canada: Remote Sensing of tundra disturbance and restoration from saline intrusion
Creators: name: LAPKA, STEPHANIE
Publisher: name: Graduate Studies
Year: 2013
Subjects: subject: Physical Geography
subject: Remote Sensing
subject: Mackenzie Delta
subject: Storm surge
subject: saline intrusion

description: As the Circumpolar Arctic continues to undergo strong environmental change - such as increased annual temperatures and decreased sea ice cover - natural disturbances are occurring at frequencies and magnitudes never before recorded (Chapin et al. 2000; Manson and Solomon 2007; Shaver and Kummerow 1992). Coastlines and low-lying terrain have been predicted to be among the environments most susceptible to disturbance events, especially within the western Canadian Arctic (Forbes 2011; Lantuit et al. 2011). In September 1999, an oceanic storm surge occurred over the alluvial islands of the outer Mackenzie Delta, NWT Canada. The salt water incursion killed more than 250 km2 of freshwater tundra. Over a decade later, dead vegetation remains the dominant land cover for more than one quarter of the impacted region. Dynamic retrospective studies such as the one conducted here are important tools for properly monitoring current processes and forecasting future impacts within Arctic landscapes (Hilbert 2006). Landsat imagery has provided the data needed to perform an ecological assessment distinctive from almost all vegetation-based studies conducted within the Circumpolar Arctic to date. Completed within this thesis is a land cover map time series with close to annual coverage between 1972 and 2010 of the alluvial islands in the outer Mackenzie Delta, as well as the first landscape-level vegetation recovery assessment of the area from the largest oceanic storm surge event to have occurred there in the past 1,000 years.
Percolation and Schramm-Loewner evolution in the 2D random-field Ising model
Creators: name: Stevenson, Jacob D.
name: Weigel, Martin
Publisher: name: arXiv
Year: 2011
Subjects: subject: Statistical Mechanics (cond-mat.stat-mech)
subject: Disordered Systems and Neural Networks (cond-mat.dis-nn)
subject: FOS: Physical sciences

description: The presence of random fields is well known to destroy ferromagnetic order in Ising systems in two dimensions. When the system is placed in a sufficiently strong external field, however, the size of clusters of like spins diverges. There is evidence that this percolation transition is in the universality class of standard site percolation. It has been claimed that, for small disorder, a similar percolation phenomenon also occurs in zero external field. Using exact algorithms, we study ground states of large samples and find little evidence for a transition at zero external field. Nevertheless, for sufficiently small random field strengths, there is an extended region of the phase diagram, where finite samples are indistinguishable from a critical percolating system. In this regime we examine ground-state domain walls, finding strong evidence that they are conformally invariant and satisfy Schramm-Loewner evolution ($SLE_κ$) with parameter $κ= 6$. These results add support to the hope that at least some aspects of systems with quenched disorder might be ultimately studied with the techniques of SLE and conformal field theory.
title: Brain Responses During Robot-Error Observation
Creators: name: Welke, Dominik
name: Behncke, Joos
name: Hader, Marina
name: Schirrmeister, Robin Tibor
name: Schönau, Andreas
name: Eßmann, Boris
name: Müller, Oliver
name: Burgard, Wolfram
name: Ball, Tonio
Publisher: name: DuEPublico: Duisburg-Essen Publications Online, University of Duisburg-Essen, Germany
Year: 2017
Subjects: human-robot interaction
autonomous robots
brain-computer interfaces (BCI)
brain-machine interfaces (BMI)
neurorobotics
electroencephalography (EEG)
error observation
error-related negativity (ERN)

description: Brain-controlled robots are a promising new type of assistive device for severely impaired

persons. Little is however known about how to optimize the interaction of humans and brain-controlled

robots. Information about the human’s perceived correctness of robot performance might provide a useful

teaching signal for adaptive control algorithms and thus help enhancing robot control. Here, we studied

whether watching robots perform erroneous vs. correct action elicits differential brain responses that can

be decoded from single trials of electroencephalographic (EEG) recordings, and whether brain activity

during human-robot interaction is modulated by the robot’s visual similarity to a human.

To address these topics, we designed two experiments. In experiment I, participants watched a robot arm

pour liquid into a cup. The robot performed the action either erroneously or correctly, i.e. it either spilled

some liquid or not. In experiment II, participants observed two different types of robots, humanoid and

non-humanoid, grabbing a ball. The robots either managed to grab the ball or not.

We recorded high-resolution EEG during the observation tasks in both experiments to train a Filter Bank

Common Spatial Pattern (FBCSP) pipeline on the multivariate EEG signal and decode for the correctness

of the observed action, and for the type of the observed robot. Our findings show that it was possible to

decode both correctness and robot type for the majority of participants significantly, although often just

slightly, above chance level. Our findings suggest that non-invasive recordings of brain responses elicited

when observing robots indeed contain decodable information about the correctness of the robot’s action

and the type of observed robot. Our study also indicates that, given the, so far, relatively low decoding

accuracies, either further improvements in non-invasive recording and analysis techniques or the

utilization of intracranial measurements of neuronal activity will be necessary for practical applications.
Subsídios para uma Teoria das Crises Políticas
Creators: name: Mendes, António Mira Marques
Publisher: name: SOPCOM: Associação Portuguesa de Ciências da Comunicação
Year: 2005

description: A utilização da expressão “crise política” tem vindo a vulgarizar-se no nosso quotidiano na expressão de analistas e comentadores, que não estritamente políticos. A ela se faz apelo continuamente no discurso mediático. Todavia, e com a excepção de algumas incursões sociológicas (Dobry, 1992; Thompson, 2000) a sistematização teórica surge a custo, devido, cremos nós, à volatilidade do objecto e à possibilidade multidisciplinar da abordagem. É nossa intenção contribuir para um aprofundamento do conceito e para um alargamento do debate. (...)
description: SOPCOM: Associação Portuguesa de Ciências da Comunicação, 2005: 4º SOPCOM: “Repensar os Media: Novos Contextos da Comunicação e da Informação”