cometadata/datacite-rtg-text-other-reclassification-records huggingface dataset:
Do Argumento à Cena: Cinema em processo colaborativo no Ciberespaço
Creators: name: Lobo, Juliana Campos
name: Valente, José António Costa
Publisher: name: SOPCOM: Associação Portuguesa de Ciências da Comunicação
Year: 2013

description: A presente comunicação se debruça sobre a produção cinematográfica colaborativa, com a utilização do espaço online como suporte deste processo, e sua comparação com o que é concebido como cinema tradicional/convencional. É analisado o resultado estético que o processo colaborativo oferece ao produto final, que é o próprio filme. De acordo com alguns parâmetros estabelecidos, descrevem-se e analisam-se dois projetos cinematográficos, realizados de acordo com as noções do que seria considerado um processo colaborativo: Life in a Day e No amor, sendo este último o primeiro projeto de filme colaborativo desenvolvido no Brasil.
description: SOPCOM: Associação Portuguesa de Ciências da Comunicação, 2013: 8º SOPCOM: "Comunicação Global, Cultura e Tecnologia"
Implicações profissionais da utilização de Redes Sociais Online
Creators: name: Silva, Catarina Melo E
name: Antunes, Maria João
Publisher: name: SOPCOM: Associação Portuguesa de Ciências da Comunicação
Year: 2013

description: A crescente popularização das redes sociais online, muito particularmente do Facebook, extravasa hoje largamente a comunidade estudantil, que começou originalmente por atrair, sendo possível encontrar pessoas com os mais variados perfis e literacia informacional a partilhar diversos tipos de informação online. A exposição dos sujeitos nestes sites, onde os “amigos” são muitas vezes colegas de trabalho ou chefias, suscita, cada vez mais, diversas preocupações relacionadas com as implicações profissionais, resultantes de um comportamento menos adequado nestas redes. Neste contexto, o presente artigo tem como principal objetivo compreender que utilização é feita das redes sociais online em Portugal, em particular do Facebook, por um universo de 64 indivíduos trabalhadores ativos e quais as implicações que poderá ter o comportamento online destes sujeitos na sua vida profissional. A compreensão resultará não só da análise das suas atitudes face à utilização da rede, mas também averiguando, do ponto de vista jurídico, até que ponto o seu comportamento, visível através da informação partilhada, pode ser legalmente usado em seu prejuízo.
description: SOPCOM: Associação Portuguesa de Ciências da Comunicação, 2013: 8º SOPCOM: "Comunicação Global, Cultura e Tecnologia"
Model Predictive Control of DFIG-Based Wind Power Generation Systems
Creators: name: Soliman, Mostafa
Publisher: name: Graduate Studies
Year: 2013
Subjects: subject: Engineering--Electronics and Electrical
subject: Model Predictive Control
subject: Wind power generation

description: Novel control strategies that improve the cost effectiveness of wind energy conversion systems are proposed in this thesis. The main focus is on grid-connected variable-speed variable-pitch wind turbines equipped with doubly fed induction generators (DFIGs). At the wind turbine control level, a multivariable control strategy based on model predictive control techniques is proposed. The proposed strategy is formulated for the whole operating region of the wind turbine, i.e., both partial and full load regimes. The pitch angle and generator torque are controlled simultaneously to maximize energy capture, mitigate drive train dynamic loads, and smooth the power generated while reducing the pitch actuator activity. This has the effect of improving the efficiency and the power quality of the electrical power generated, and increasing the life expectancy of the installation. Extensive simulation studies show that the proposed control strategy provides superior performance when compared to classical control strategies commonly used in the litterature. For applications having fault tolerant control requirements, such as offshore wind farms, a new wind turbine control strategy based on adaptive subspace predictive control is proposed. In contrast with subspace predictive control algorithms previously proposed in the literature, the proposed strategy ensures offset-free tracking. The effectiveness of the proposed strategy is illustrated by simulating a wind turbine under normal operation and a fault in the hydraulic pitch system. Another control problem considered in this thesis is the design of the generator control system to ensure fault ride through for DFIG-based wind turbines. This requirement is dictated by recent grid codes, and it necessitates that the DFIG should be connected to the grid and capable of providing reactive power support during large voltage dips. This is challenging for DFIG-based wind turbines due to their partially rated power converters. In this thesis, a novel control strategy, based on using model predictive control and a dynamic series resistance protection scheme, is proposed to ensure fault ride through requirement.
Magnetism in nanometer-thick magnetite
Creators: name: Monti, Matteo
name: Santos, Benito
name: Mascaraque, Arantzazu
name: de la Fuente, Oscar Rodríguez
name: Niño, Miguel Angel
name: Menteş, Tevik Onur
name: Locatelli, Andrea
name: McCarty, Kevin F.
name: Marco, Jose F.
name: de la Figuera, Juan
Publisher: name: arXiv
Year: 2011
Subjects: subject: Mesoscale and Nanoscale Physics (cond-mat.mes-hall)
subject: Materials Science (cond-mat.mtrl-sci)
subject: FOS: Physical sciences

description: The oldest known magnetic material, magnetite, is of current interest for use in spintronics as a thin film. An open question is how thin can magnetite films be and still retain the robust ferrimagnetism required for many applications. We have grown one-nanometer-thick magnetite crystals and characterized them in situ by electron and photoelectron microscopies including selected-area x-ray circular dichroism. Well-defined magnetic patterns are observed in individual nano-crystals up to at least 520 K, establishing the retention of ferrimagnetism in magnetite two-unit-cells thick.
description: 5 pages, 4 figures
Adequação de Plataformas Digitais à construção de narrativas Online: o caso prático da comunidade sénior
Creators: name: Soares, Célia
Publisher: name: SOPCOM: Associação Portuguesa de Ciências da Comunicação
Year: 2013

description: Com o envelhecimento demográfico e o crescimento da utilização da Internet por parte dos seniores, os modelos de partilha de informação podem ser explorados para dar resposta a necessidades emergentes. Neste sentido, esta comunicação apresenta o processo de definição de um modelo, desenhado de forma participativa, capaz de suportar a construção de narrativas digitais, a integrar no módulo de partilha do projeto SEDUCE1. O objetivo passa por estruturar um modelo utilizado na construção de narrativas que satisfaça as necessidades dos utilizadores possibilitando a partilha de informação entre os membros de uma comunidade online. A aplicabilidade do modelo é testada na forma de protótipo que se encontra em fase de validação em contexto de trabalho colaborativo com um conjunto de seniores que frequentam a universidade sénior de Ermesinde.
description: SOPCOM: Associação Portuguesa de Ciências da Comunicação, 2013: 8º SOPCOM: "Comunicação Global, Cultura e Tecnologia"
The pro-survival effects of glucose-dependent insulinotropic polypeptide receptor signalling on beta cells
Creators: name: Widenmaier, Scott B
Publisher: name: University of British Columbia
Year: 2010

description: Gastrointestinal incretin hormones glucose-dependent insulinotropic polypeptide (GIP) and glucagon-like peptide-1 (GLP-1) have been targeted for the treatment of diabetes due, in large part, to their physiological actions on pancreatic β-cells in potentiating glucose-stimulated insulin secretion and increasing insulin biosynthesis. In recent years, incretins have also been revealed to exert potent actions on β-cell proliferation and survival. However, most studies have focused on GLP-1, and so there is a relative paucity of evidence regarding GIP. In the current thesis, it was hypothesized that GIP receptor (GIPR) activation in β-cells enhances critical anti-apoptotic signalling networks and promotes β-cell survival, which in rodent models of type 2 diabetes mellitus results in an elevation in β-cell mass and improvement in glycaemic control. This hypothesis was initially tested by examining the effects of GIPR activation on the protein-serine/threonine kinase Akt, which is known to exert potent pro-survival actions in β-cells. It was revealed that GIPR stimulation activates Akt signalling through both canonical and non-canonical mechanisms. Next, the effects of GIPR activation on pro- and anti-apoptotic Bcl-2 family proteins were examined on β-cells under pro-apoptotic stress. GIPR activation was found to suppress the onset of stress-induced apoptosis by preventing mitochondrial translocation of pro-apoptotic proteins Bad and Bim as well as activation of the key pro-apoptotic protein Bax, and this effect was due to Akt-mediated inhibition of the apoptosis signal regulating kinase-1. Lastly, the effects of GIPR activation on β-cell survival were examined in vivo by administering a long acting GIP analogue to multiple rodent models of diabetes that exhibit elevated β-cell apoptosis. In all models the GIP analogue promoted β-cell survival and improved glycaemic control. Overall, these studies supported the hypothesis proposed. In conclusion, similar to the signalling actions of the GLP-1 receptor, GIPR signalling exerts potent actions on β-cell survival, and therefore, therapeutics that enhance GIPR signalling in β-cells merit consideration for the treatment of type 2 diabetes mellitus.
INCORPORATING PROJECT-BASED LEARNING IN IT EDUCATION, ENHANCING PRACTICAL SKILLS AND PROBLEM-SOLVING ABILITIES
Creators: name: Mukhtarov, Farrukh
Publisher: name: Zenodo
Year: 2023

description: Project-based learning (PBL) has emerged as an effective pedagogical approach in various educational settings, including IT education. PBL provides a structured framework for students to engage in authentic learning experiences, fostering the development of practical skills, problem-solving abilities, and critical thinking. This article delves into the integration of PBL in IT education, highlighting its benefits and exploring strategies for successful implementation.
Mаtеrialü IV. mеzsdunarodnogo magyarszkogo szimpoziuma. Kazany‒Bolgar. 15‒19. oktjabrja 2018. G. Arheologija evrazijszkih sztepej 6 (2018)
Creators: name: Erdélyi, István
Publisher: name: Kőrösi Csoma Társaság
Year: 2019

description: Keletkutatás, 2019. tavasz ISSN 0133-4778
Adiabatic Heating of Contracting Turbulent Fluids
Creators: name: Robertson, Brant
name: Goldreich, Peter
Publisher: name: arXiv
Year: 2012
Subjects: subject: Astrophysics of Galaxies (astro-ph.GA)
subject: FOS: Physical sciences

description: Turbulence influences the behavior of many astrophysical systems, frequently by providing non-thermal pressure support through random bulk motions. Although turbulence is commonly studied in systems with constant volume and mean density, turbulent astrophysical gases often expand or contract under the influence of pressure or gravity. Here, we examine the behavior of turbulence in contracting volumes using idealized models of compressed gases. Employing numerical simulations and an analytical model, we identify a simple mechanism by which the turbulent motions of contracting gases "adiabatically heat", experiencing an increase in their random bulk velocities until the largest eddies in the gas circulate over a "Hubble" time of the contraction. Adiabatic heating provides a mechanism for sustaining turbulence in gases where no large-scale driving exists. We describe this mechanism in detail and discuss some potential applications to turbulence in astrophysical settings.
description: 5 pages, 2 figures. Accepted by the Astrophysical Journal Letters
Using 9.4T MRI To Investigate Parenchymal And Vascular Changes In An Animal Model Of Pediatric Mild Traumatic Brain Injury
Creators: name: Imhof, Elizabeth
Publisher: name: Graduate Studies
Year: 2015
Subjects: subject: Neuroscience
subject: traumatic
subject: brain
subject: injury

description: Mild traumatic brain injury (mTBI) is the most common form of brain injury in Canada. No standard CT or MRI methods can identify or monitor mTBI. It is necessary to develop methods to identify patients at risk of long term problems and monitor treatment. Evidence exists for abnormal blood flow post-mTBI, therefore we hypothesized that 24 hr after injury there would be abnormal vascular regulation with no parenchymal changes. Juvenile rats bred in house and ordered from a supplier sustained a mTBI or a sham injury using a weight drop model. Animals were imaged 24hr later using a 9.4T MRI. No structural changes were evident using standard MRI sequences, supporting the model as being consistent with clinical case of mTBI. mTBI bred rats had a larger sagittal sinus size. The larger sinus size in mTBI compared to control rats potentially suggests cerebrovenous dysregulation which could relate to mTBI symptomology.
Os rastros digitais e a memória dos jovens no Facebook
Creators: name: Henriques, Rosali
name: Dodebei, Vera
Publisher: name: SOPCOM: Associação Portuguesa de Ciências da Comunicação
Year: 2013

description: A internet tem revolucionado a forma como as pessoas veem o mundo. Como em qualquer campo das Ciências Humanas, o campo da memória também está sendo afetado por esta nova mídia. Este texto discute como a internet, mas principalmente as redes sociais, com especial atenção ao Facebook, tem mudado a forma como os jovens lidam com os processos da memória. Destacamos nesta comunicação as relações entre memória e internet, analisando o surgimento do Facebook e como as ações de postar, curtir e compartilhar são parte do processo de memória e esquecimento entre os jovens nativos digitais.
description: SOPCOM: Associação Portuguesa de Ciências da Comunicação, 2013: 8º SOPCOM: "Comunicação Global, Cultura e Tecnologia"
A Konstantinápolyi Magyar Tudományos Intézet megalapítása: titkos tárgyalások, tervek és kultúrdiplomácia
Creators: name: Fodor, Gábor
Publisher: name: Kőrösi Csoma Társaság
Year: 2019

description: Keletkutatás, 2019. tavasz ISSN 0133-4778
Quantum Chemical Predictions of the Stable Isotope Distribution of Copper in Blood Serum
Creators: name: Tennant, Alexander
Publisher: name: Graduate Studies
Year: 2017
Subjects: subject: Physics
subject: Density Functional Theory
subject: Stable isotope
subject: Copper
subject: Hepatocyte
subject: Reduced partition function
subject: CTR1
subject: Ceruloplasmin
subject: ATP7B
subject: ATOX1
subject: Blood serum
subject: Isotopic mass balance

description: Changes in the stable isotope composition of copper in blood serum as a result of biological processes in the liver were quantified. The model calculated reduced partition function ratios corresponding to interactions involving individual proteins using Density Functional Theory. This quantified the effect that each process had on the redistribution of copper isotopes in the liver. It was not possible to calculate the reduced partition function of CTR1 and an optimization process was used to constrainthe possible isotopic fractionation associated withinteractions involving CTR1. The exchange of copper between ceruloplasmin and ATP7B has the most significant impact on the copper isotopic composition of blood serum. In the absence of values for reduced partition functions and protein concentrations for other processes in the liver, the possible distribution of copper isotopes in the liver was estimated. It was found that there may be large intracellular copper isotope abundance variations in hepatocytes.
The microscopic meaning of grand potential resulting from combinatorial approach to a general system of particles
Creators: name: Fronczak, Agata
Publisher: name: arXiv
Year: 2012
Subjects: subject: General Physics (physics.gen-ph)
subject: FOS: Physical sciences

description: We present a completely new approach to the problem of interacting fluids, which we believe may provide important insights into microscopic mechanisms that lead to the occurrence of phase transitions. The approach exploits enumerative properties and combinatorial meaning of Bell polynomials. We derive the exact formula for probability of a general system of N particles at temperature T to consist of k weakly coupled clusters of various sizes. We also show that the grand potential of the system may be considered as the exponential generating function for the number of internal states (thermodynamic probability) of these clusters. The microscopic interpretation of the grand potential is novel and surprising, especially if one recalls that until now the only thermodynamic meaning of this free energy was known. We also derive an approximated expression for the density of states.
Stability for a GNS inequality and the Log-HLS inequality, with application to the critical mass Keller-Segel equation
Creators: name: Carlen, Eric A.
name: Figalli, Alessio
Publisher: name: arXiv
Year: 2011
Subjects: subject: Analysis of PDEs (math.AP)
subject: FOS: Mathematics
subject: 35A23, 93D05

description: Starting from the quantitative stability result of Bianchi and Egnell for the 2-Sobolev inequality, we deduce several different stability results for a Gagliardo-Nirenberg-Sobolev inequality in the plane. Then, exploiting the connection between this inequality and a fast diffusion equation, we get a quantitative stability for the Log-HLS inequality. Finally, using all these estimates, we prove a quantitative convergence result for the critical mass Keller-Segel system.
Visibilidade Mediática: por uma reconfiguração do imaginário no Ciberespaço
Creators: name: Junior, Ariovaldo Folino
Publisher: name: SOPCOM: Associação Portuguesa de Ciências da Comunicação
Year: 2013

description: O cyberspace é um ambiente que propicia a desconfiguração da relação primária entre a realidade e o imaginário, propondo, de maneira não passível de escolha, outro ordenamento do imaginário social (CASTORIARDIS, 1982) que altera a partir deste, uma nova posição do indivíduo dentro da sociedade multicultural. Neste ambiente, ser cibermediático tem suas exigências e tal condição exige estar em constante estado de alerta, hiperconectado, disponível, atualizado; deve-se transpor e propor uma nova realidade diante do imaginário resignificado. Assim, a situação “do fenômeno glocal” unida, concomitantemente à experiência do tempo real, faz fecundar a visibilidade mediática dentro da cibercultura (aqui tomada como categoria de época, sinônima de civilização mediática avançada, organização sociotecnológica contemporânea do capitalismo tardio) (TRIVINHO, 2007). A suspensão da realidade por um dado tempo em prol da invenção de um real mais real do que o real, em conformidade com a noção de hiper-real (BAUDRILLARD, 1991) faz com que haja uma profusão de perfis e ações identitárias subjetivas. As subjetividades que colonizam o espaço das redes sociais digitais estão, antes e ao mesmo tempo, colonizadas pelo imaginário de sucesso, fama e realização alardeados pelas indústrias cultural e cibercultural. A subjetividade contemporânea é fruto da confluência das culturas mediática, narcisista e pós-moderna. Tais questões requerem que se pense sobre a experiência da constituição dos sujeitos nos espaços e tempos virtuais a partir dos arranjamentos de identificações possíveis pelas plataformas de apresentação e presentificação do eu – redes socias. Este trabalho é parte de minha pesquisa de doutoramento realizada no Programa de Comunicação e Semiótica (COS) da Pontifícia Universidade Católica de São Paulo (PUCSP) - Brasil, que investiga a temática da comunicação virtual, identidade e imaginário infantil na cibercultura, e propõe apresentar neste recorte, uma incursão diante do conceito de “glocal” e visibilidade mediática, buscando, a partir destes, refletir sobre as reconfigurações do imaginário.
description: SOPCOM: Associação Portuguesa de Ciências da Comunicação, 2013: 8º SOPCOM: "Comunicação Global, Cultura e Tecnologia"
The Ionization State of the Halo Planetary Nebula NGC 2438
Creators: name: Dalnodar, Silvia
Publisher: name: arXiv
Year: 2011
Subjects: subject: Astrophysics of Galaxies (astro-ph.GA)
subject: Solar and Stellar Astrophysics (astro-ph.SR)
subject: FOS: Physical sciences

description: NGC 2438 is a classical multiple shell or halo planetary nebula (PN). Its central star and the main nebula are well studied. Also it was target of various hydrodynamic simulations (Corradi et al. 2000). This initiated a discussion whether the haloes are mainly containing recombined gas (Schoenberner et al. 2002), or if they are still ionized (Armsdorfer et al. 2003). An analysis of narrow-band images and long slit spectra at multiple slit positions was done to obtain a deeper look on morphological details and the properties of the outer shell and halo. For this work there was data available from ESO (direct imaging and long slit spectroscopy) and from SAAO (spectroscopic observations using a small slit - scanning over the whole nebula). Using temperature measurements from emission lines resulted in an electron temperature which clearly indicates a fully ionized stage. Additionally measurements of the electron density suggest a variation of the filling factor.
description: 3 pages, 1 figure, to appear in proceedings of the IAU Symposium 283: "Planetary Nebulae: An Eye to the Future", Eds.: A. Manchado, L. Stanghellini and D. Schoenberner
Instruct-ULTRA D5.4 Long-Term Strategic Outreach Plan for both academic and industry users, including a training plan
Creators: name: Owens, Ray
name: Daenke, Susan
name: Chapman, Stephanie
name: Gray, Naomi
name: Morelli, Francesca
Publisher: name: Zenodo
Year: 2020

description: The Strategic Outreach Plan outlines key aims for Instruct to maintain and strengthen its position in the European Research Infrastructure (RI) landscape. Looking to the long-term sustainability of Instruct, the Plan sets out objectives in core areas of RI activity, for the delivery of technical innovations, training and collaborations with both academia and industry, supporting the goals of the European Research Area. The Plan will form part of a five-yearly review process within Instruct-ERIC.
MPEC 2023-X54 : 2023 XS
Creators: name: Minor Planet Center Staff
Publisher: name: The Minor Planet Center
Year: 2023
Subjects: subject: Small Solar System bodies
valueUri: http://astrothesaurus.org/uat/1469
subject: 2023 XS

description: The Minor Planet Electronic Circulars contain information on unusual minor planets, routine data on comets and natural satellites, and occasional editorial announcements.  They are published on behalf of Division F of the International Astronomical Union by the Minor Planet Center, Smithsonian Astrophysical Observatory, Cambridge, MA 02138, U.S.A.
Neutralizing antibodies and the biological response to interferon-beta therapy
Creators: name: Lam, Sin Man
Publisher: name: University of British Columbia
Year: 2010

description: Interferon-beta (IFN-beta) was the first disease modifying drug to be approved for the treatment of multiple sclerosis (MS). IFN-beta reduces relapse rates, relapse severity as well as slows the progression of disease burden. However, neutralizing antibodies (NAbs) occur in a proportion of patients receiving IFN-beta treatment. NAbs bind to IFN-beta, reduce drug bioavailability and high levels of NAbs reduce drug efficiency. Our first objective was to develop and validate a sensitive and rapid method to measure NAbs. Existing methods to measure NAbs include the cytopathic effect assay (CPE) method and the myxovirus protein A (MxA) assay. However, these assays are time consuming and may be arduous to perform. We describe the optimization of a luciferase reporter gene assay to measure NAbs. To validate the assay, we assayed sera from IFN-beta treated MS patients with the optimized luciferase method and compared the results to those obtained with the reference CPE method. NAb status measured by the luciferase and the CPE method did not yield a significant difference. NAb titres obtained from the two methods correlated very well. The luciferase assay is reliable, appropriately sensitive and requires less time than the currently available NAb methods. In addition to measuring NAbs, the biological activity of IFN-beta can be measured by monitoring IFN-inducible biomarkers, specifically MxA mRNA. Bioavailability measurements become especially valuable in patients with low to moderate NAb titres, “the grey zone”, and have been identified as a possible alternative for NAb measurements. Nonetheless, there is still controversy about how long should one wait after an IFN injection to draw blood for MxA mRNA measurements. Our objective was to identify the optimal time for blood draws to measure MxA mRNA. MxA mRNA was the most robust at 4-12 hours after IFN-beta injection and peaked at 8h post IFN injection. NAbs were evidently associated with an attenuation of IFN-beta bioactivity. In conclusion, we characterized a technique to assess NAbs associated with IFN-beta therapy and a method to assess IFN-beta biological activity in treated patients. Altogether, this will help measure the effects of IFN-beta treatment and assist clinicians in tailoring therapy to the individual patient.
O Livro na passagem de “Átomos” a “Bits”: as Tecnologias Digitais no contexto do Livro Eletrónico
Creators: name: Rodrigues, Ricardo Pereira
Publisher: name: SOPCOM: Associação Portuguesa de Ciências da Comunicação
Year: 2013

description: As Tecnologias de Informação e Comunicação colocam em debate o modo de pensar e olhar o livro tradicional e originam novas materialidades para o texto e novas formas, espaços e géneros de leitura. A revolução originada por Gutenberg democratizou o acesso ao livro tradicional, alterando os processos de acesso ao conhecimento. As tecnologias eletrónicas trouxeram consigo uma nova revolução, virtualizando o acesso aos textos que alteraram a paisagem da cultura clássica do livro. Recorrendo à ideia original do investigador Nicholas Negroponte, pretende-se realizar uma análise das alterações que o livro sofreu, enquanto objeto de suporte ao texto, na sua passagem para contextos digitais ou na passagem de “átomos” para “bits”.
description: SOPCOM: Associação Portuguesa de Ciências da Comunicação, 2013: 8º SOPCOM: "Comunicação Global, Cultura e Tecnologia"
Use of de novo Formation of Testis Tissue to Study Cell Interactions in the Neonatal Porcine Testis
Creators: name: Dores, Camila
Publisher: name: Graduate Studies
Year: 2015
Subjects: subject: Animal Physiology
subject: Biology--Cell
subject: Biology--Molecular
subject: Veterinary Science
subject: Spermatogonial stem cell
subject: Niche
subject: De novo morphogenesis of the testis
subject: Primary Cilia
subject: VEGFA

description: The work presented in this dissertation employs the use of de novo formation of seminiferous tubules in vivo and in vitro to study the testicular microenvironment, with a focus on the role of Vascular Endothelial Growth Factor A (VEGFA) and the primary cilium organelle. First, we optimized the de novo morphogenesis assay by testing different methods to improve the spermatogenic efficiency of the bioassay. We showed that addition of Matrigel to the cell pellet prior to grafting results in a better efficiency than enrichment of germ cells, and when cells are grafted under the same conditions, the number of cells transplanted directly relates to the number of seminiferous tubules formed. Second, we evaluated the role of VEGFA on the reestablishment of the testicular microenvironment. We showed that de novo formed tubules developed from cell pellets treated with VEGFA contained higher number of proliferating cells per tubule and higher spermatogenic efficiency. These findings suggest that VEGFA has a protective role during the grafting process. Another study explored the stirred suspension bioreactor (SSB) as a novel method to enrich for germ cells on a large scale. We used the optimized de novo morphogenesis assay to functionally assess the physiological abilities of cells cultured under shear force stress in the SSB. Results of these experiments indicate that SSB is a practical alternative to attain enriched populations of germ cells on a large scale, which maintains the functional spermatogenic potential of the cells. Finally, the last chapter focused on the role of the primary cilium in the testicular microenvironment. This set of experiments used the small molecule inhibitor, Ciliobrevin D, to disturb the organelle. We demonstrated that lack of primary cilia blocks Hedgehog signaling and impairs tubule formation in vitro. Overall, the work presented in this dissertation contributes to the improvement of available models to study male reproductive biology and to our understanding of the role of VEGFA and primary cilia in the testicular microenvironment.
Far-Ultraviolet and Far-Infrared Bivariate Luminosity Function of Galaxies: Complex Relation between Stellar and Dust Emission
Creators: name: Takeuchi, Tsutomu T.
name: Sakurai, Akane
name: Yuan, Fang-Ting
name: Buat, Veronique
name: Burgarella, Denis
Publisher: name: arXiv
Year: 2012
Subjects: subject: Cosmology and Nongalactic Astrophysics (astro-ph.CO)
subject: FOS: Physical sciences

description: Far-ultraviolet (FUV) and far-infrared (FIR) luminosity functions (LFs) of galaxies show a strong evolution from $z = 0$ to $z = 1$, but the FIR LF evolves much stronger than the FUV one. The FUV is dominantly radiated from newly formed short-lived OB stars, while the FIR is emitted by dust grains heated by the FUV radiation field. It is known that dust is always associated with star formation activity. Thus, both FUV and FIR are tightly related to the star formation in galaxies, but in a very complicated manner. In order to disentangle the relation between FUV and FIR emissions, we estimate the UV-IR bivariate LF (BLF) of galaxies with {\sl GALEX} and {\sl AKARI} All-Sky Survey datasets. Recently we invented a new mathematical method to construct the BLF with given marginals and prescribed correlation coefficient. This method makes use of a tool from mathematical statistics, so called "copula". The copula enables us to construct a bivariate distribution function from given marginal distributions with prescribed correlation and/or dependence structure. With this new formulation and FUV and FIR univariate LFs, we analyze various FUV and FIR data with {\sl GALEX}, {\sl Spitzer}, and {\sl AKARI} to estimate the UV-IR BLF. The obtained BLFs naturally explain the nonlinear complicated relation between FUV and FIR emission from star-forming galaxies. Though the faint-end of the BLF was not well constrained for high-$z$ samples, the estimated linear correlation coefficient $ρ$ was found to be very high, and is remarkably stable with redshifts (from 0.95 at $z = 0$ to 0.85 at $z = 1.0$). This implies the evolution of the UV-IR BLF is mainly due to the different evolution of the univariate LFs, and may not be controlled by the dependence structure.
description: 10 pages, 7 figures, Earth, Planets and Space, in press
Personalidade da Marca Territorial: o caso da cidade do Porto
Creators: name: Cardoso, Paulo Ribeiro
name: Diniz, Alberto Ortiz
Publisher: name: SOPCOM: Associação Portuguesa de Ciências da Comunicação
Year: 2013

description: Nas últimas décadas as cidades têm vindo a desenvolver a sua marca territorial aplicando ferramentas de gestão, de marketing e de comunicação no seu desenvolvimento e promoção junto dos seus diversos públicos: residentes, visitantes e investidores. A marca territorial tem sido uma área de trabalho no âmbito institucional e empresarial mas também objeto de investigação científica no contexto académico. Neste domínio o conceito de “personalidade da marca” tem sido utilizado enquanto instrumento que permite compreender a perceção dos públicos em relação ao território (Hosany et al., 2007, Bartikowski et al. 2009, Kiliç e Sop, 2012). O modelo de personalidade da marca, desenvolvido por Jennifer Aaker (1997), é, nesta área, um dos constructos teóricos mais difundidos. A sua estrutura contempla cinco dimensões da personalidade – sinceridade, competência, excitação, sofisticação e rudeza – que descrevem a marca “enquanto pessoa”. Além da sua aplicação no contexto académico, esta ferramenta pode ter aplicações práticas importantes, nomeadamente na estruturação de um mapa de valores e na estratégia de comunicação da marca. O presente estudo aplica este modelo à cidade do Porto procurando perceber de que forma os seus visitantes percecionam esse território. A investigação envolveu a administração de um questionário a uma amostra de cerca de duzentos indivíduos de nacionalidade portuguesa, visitantes da cidade do Porto. Os resultados permitem dar um contributo para a configuração de um retrato da personalidade desta cidade.
description: SOPCOM: Associação Portuguesa de Ciências da Comunicação, 2013: 8º SOPCOM: "Comunicação Global, Cultura e Tecnologia"
Intermittent GNSS Signal Tracking for Improved Receiver Power Performance
Creators: name: Bellad, Vijaykumar
Publisher: name: Graduate Studies
Year: 2015
Subjects: subject: Engineering--Electronics and Electrical
subject: Geotechnology
subject: GNSS receivers
subject: Power saving
subject: Intermittent tracking

description: Power consumption is critical in battery-operated devices using GNSS receivers. Modern day receivers track satellite signals from multiple constellations to achieve a better position performance making power conservation critical. Receivers in battery-operated devices employ intermittent signal tracking (or cyclic tracking) to conserve power. This research investigates various aspects of intermittent tracking and analyze the positioning and tracking performance with different duty cycles and solution update intervals in stationary and kinematic cases. Although power conservation is important it is preferable to achieve position accuracy equivalent to that of a continuously tracking receiver when operating in intermittent tracking mode, known as “feasibility” in this research. However, pseudorange accuracy and in turn position accuracy depend on the ability of signal tracking loops to converge during the receiver active period. Predicting code phase and Doppler values over the receiver sleep period can help to achieve this. The first part of this research identifies code phase and Doppler parameters as the factors influencing intermittent tracking operation, proposes a vector-based approach to improve their estimates at the end of sleep periods and provides a theoretical framework to determine the feasibility of intermittent tracking. The signal parameter errors at the end of sleep periods, length of the receiver active periods and the tracking loop transient response determine the feasibility. The amount of power saving can be as high as 60% to 70% in typical open sky kinematic cases with a longer solution update interval of 5 s. The second part of the research investigates intermittent tracking in weak signal environments. Doppler uncertainty during the receiver sleep period is identified as the limiting factor when longer coherent integration is used and a method is proposed to overcome this challenge. The last part of the research explores the use of inertial sensor aiding for improving intermittent tracking performance. A MEMS IMU (representative of very low power modern day IMUs) is used to assist tracking and improve power performance through GPS/INS integration. The inertial aiding does not improve the code phase estimation accuracy during the sleep period significantly; however improved Doppler estimation makes shorter duty cycles feasible.
title: Schulbücher im Sachunterricht - welche Themenauswahl bieten sie? Eine inhaltsanalytische Studie zu ausgesuchten Lehrwerken
Creators: name: Ahlgrim, Tobias
Publisher: name: UVH - Universitätsverlag Hildesheim
Year: 2017

description: Hildesheimer Beiträge zur Fachdidaktischen Forschung
Brane orbits
Creators: name: Bergshoeff, Eric A.
name: Marrani, Alessio
name: Riccioni, Fabio
Publisher: name: arXiv
Year: 2012
Subjects: subject: High Energy Physics - Theory (hep-th)
subject: FOS: Physical sciences

description: We complete the classification of half-supersymmetric branes in toroidally compactified IIA/IIB string theory in terms of representations of the T-duality group. As a by-product we derive a last wrapping rule for the space-filling branes. We find examples of T-duality representations of branes in lower dimensions, suggested by supergravity, of which none of the component branes follow from the reduction of any brane in ten-dimensional IIA/IIB string theory. We discuss the constraints on the charges of half-supersymmetric branes, determining the corresponding T-duality and U-duality orbits.
description: 34 pages, 3 figures
SYNTHESIS MAGNETIC FLUID BASED ON NANOPARTICLES CONTAINING IRON AND COBALT
Creators: name: Kayumov, Khafiz
Publisher: name: Zenodo
Year: 2023

description: In this work the magnetic fluids based on the FeFe2O4, CoFe2O4 nanoparticles have been synthesized by the chemical co-precipitation method. Morphological analysis of the FeFe2O4, CoFe2O4 nanoparticles were studied by transmission electron microscope (TEM). The comparative analysis of the experimentally measured diameter of nanoparticles FeFe2O4, CoFe2O4 in the magnetic fluid was carried out with semi-empirical calculations within the Langevin theory.
Marketing Digital no setor hoteleiro: o que as Páginas Web dizem dos hotéis portuensesD
Creators: name: Teixeira, Andreia
name: Branco, Mª João
name: Ferreira, Ivone
name: Azevedo, José Nuno
Publisher: name: SOPCOM: Associação Portuguesa de Ciências da Comunicação
Year: 2013

description: O objetivo deste estudo é teorizar sobre a importância do marketing digital no setor hoteleiro, aferindo o contributo da Internet e das suas ferramentas, nomeadamente, sites, e-mail, redes sociais e blogs na promoção e dinamização de um hotel. De forma a medir os efeitos práticos, as vantagens e a aplicabilidade destas ferramentas, foram analisados os sites dos hotéis de duas a cinco estrelas do centro histórico da cidade do Porto. Nesta análise são incluídos aspetos como a navegabilidade, comunicação, conteúdos e oferta de serviços online. Concluiu-se que há já um forte esforço de implementação desta forma emergente de marketing, por parte dos hotéis em análise. A maioria das unidades de alojamento possibilita a compra online dos seus produtos, aposta na comunicação integrada de marketing através da apresentação da missão e valores no site, comunica as suas facilidades de forma completa, tem o site traduzido para diversos idiomas, incluíndo os correspondentes aos mercados de procura emergentes, possuem uma galeria fotográfica e conteúdos de índole externa. Como principais parâmetros a serem melhorados, salienta-se a inexistência de campos para pesquisa, lacunas na explicitação de políticas de reserva e cancelamento e ausência de vídeos e blogs. Constatou-se ainda, que pouco mais de metade dos hotéis analisados estão inseridos nas redes sociais, com maior incidência no Facebook.
description: SOPCOM: Associação Portuguesa de Ciências da Comunicação, 2013: 8º SOPCOM: "Comunicação Global, Cultura e Tecnologia"
An Alternative View of the Dynamical Origin of the P11 Nucleon Resonances: Results from the Excited Baryon Analysis Center
Creators: name: Kamano, Hiroyuki
Publisher: name: arXiv
Year: 2011
Subjects: subject: Nuclear Theory (nucl-th)
subject: High Energy Physics - Phenomenology (hep-ph)
subject: Nuclear Experiment (nucl-ex)
subject: FOS: Physical sciences

description: We present an alternative interpretation for the dynamical origin of the P11 nucleon resonances, which results from the dynamical coupled-channels analysis at Excited Baryon Analysis Center of Jefferson Lab. The results indicate the crucial role of the multichannel reaction dynamics in determining the N^* spectrum.
description: 3 pages, 1 figure. Contribution to the proceedings of the 19th Particles and Nuclei International Conference (PANIC11), Cambridge, MA, USA, July 24-29, 2011
The Influence of National Culture on Differences in Organizational Culture Values
Creators: name: Chapin, Michelle
Publisher: name: Graduate Studies
Year: 2015
Subjects: subject: Psychology--Industrial
subject: organizational culture
subject: organizational values
subject: acculturation

description: Recent research suggests that certain life-altering events, such as relocation, may cause an individual‘s personal values to adapt to match those of the new situation or local culture. This thesis was designed to provide a theoretical argument and empirical support for the hypothesis that following relocation, the values an individual considers most attractive in an organization will match those values common in the expatriate‘s host country, rather than home country. A secondary goal of this thesis was to provide cross-cultural validation of the LOCS. Several of the shortened LOCS dimensions were found to be replicable across cultures, though others produced inconsistent factor loadings. As a whole, the shortened LOCS predicted job satisfaction and subjective fit, but not active job search behaviors. No pattern of significant differences was found between expatriates‘ ideal, current, host, and home country values, though moderation analyses suggest this effect may not be as direct as hypothesized.
A „hitharc oroszlánja”: Jahjapasa-oglu Báli bég (?–1527). Terjeszkedés és tartományi elit az Oszmán Birodalom európai határvidékén a 16. század elején
Creators: name: Fodor, Pál
Publisher: name: Kőrösi Csoma Társaság
Year: 2019

description: Keletkutatás, 2019. tavasz ISSN 0133-4778
Spatial variability of soil hydrophysical properties in Canadian Sphagnum dominated peatlands
Creators: name: Branham, Jordanna
Publisher: name: Graduate Studies
Year: 2013
Subjects: subject: Ecology
subject: FOS: Biological sciences
subject: Hydrology
subject: Physical Geography
subject: peat
subject: Hydrology
subject: Sphagnum
subject: hydraulic conductivity
subject: Peatland
subject: microform

description: Patterned peatlands develop through eco-hydrological feedback loops, resulting in a microtopography of hummocks and hollows. Physical and hydrologic properties were compared between climate zones, peatland types, microform types and depth in relation to elevation and the water table, to determine if the ecologic definition of microforms holds true for their hydrologic properties. Study sites were located near St. Charles-de-Bellechasse, Quebec, and Wandering River, Alberta, and consisted of a bog and fen in each location. Cores were extracted from the field and soil physical properties (bulk density, decomposition, and porosity) and hydrologic properties (saturated and unsaturated hydraulic conductivity, water retention and anisotropy), were measured. Climate may play a potential role in the anisotropy of saturated hydraulic conductivity, while peatland type influences the degree of difference between hummocks and hollows. Saturated hydraulic conductivity is dependent on depth, and supports current model assumptions of higher flow in hollows than in hummocks. Finally, unsaturated hydraulic conductivity is dependent on the physical properties of pore size distribution, inactive to active pore ratio and decomposition status. Implications of the results suggest that model assumptions for saturated K should be based on the presence of macropores or mesopores within the peat matrix, and not bulk density alone. Models that currently use only one hydraulic conductivity value for a peatland apply to only the saturated zone, as microforms significantly impact the unsaturated conditions.
Using Artificial Bee Colony Algorithm for MLP Training on Earthquake Time Series Data Prediction
Creators: name: Shah, Habib
name: Ghazali, Rozaida
name: Nawi, Nazri Mohd
Publisher: name: arXiv
Year: 2011
Subjects: subject: Neural and Evolutionary Computing (cs.NE)
subject: Artificial Intelligence (cs.AI)
subject: Machine Learning (cs.LG)
subject: FOS: Computer and information sciences

description: Nowadays, computer scientists have shown the interest in the study of social insect's behaviour in neural networks area for solving different combinatorial and statistical problems. Chief among these is the Artificial Bee Colony (ABC) algorithm. This paper investigates the use of ABC algorithm that simulates the intelligent foraging behaviour of a honey bee swarm. Multilayer Perceptron (MLP) trained with the standard back propagation algorithm normally utilises computationally intensive training algorithms. One of the crucial problems with the backpropagation (BP) algorithm is that it can sometimes yield the networks with suboptimal weights because of the presence of many local optima in the solution space. To overcome ABC algorithm used in this work to train MLP learning the complex behaviour of earthquake time series data trained by BP, the performance of MLP-ABC is benchmarked against MLP training with the standard BP. The experimental result shows that MLP-ABC performance is better than MLP-BP for time series data.
description: 8 pages,8 figures; http://www.journalofcomputing.org/volume-3-issue-6-june-2011
YouTube como palco virtual: estudo de caso da banda Boyce Avenue
Creators: name: Santos, Bárbara Marina Almeida Dos
Publisher: name: SOPCOM: Associação Portuguesa de Ciências da Comunicação
Year: 2013

description: Desde o início da década de 90 o mundo vem se familiarizando mais com a internet. Com ela não apenas governos e grandes redes de comunicação obtiveram grandes avanços, mas também o público/receptor/consumidor, que também passou a ser estudado e analisado com maior peculiaridade. Com a internet a globalização ganhou um novo conceito juntamente com a evolução da comunicação e do acesso ao conhecimento. Em um período de vivência da web 2.0 a internet ganhou novas proporções principalmente se tratando do ponto de vista do internauta/consumidor, porque através dessa nova fase a rede ganha plataformas que aumentam a interação entre os homens. Dos anos 90 para os anos 2000, como era de se esperar, as redes de relacionamento/interação também evoluíram através dos recursos tecnológicos, tentando se aproximar ao máximo de uma comunicação face a face. O YouTube é uma (das muitas) forte ferramenta de propagação/divulgação, utilizada densamente por “anônimos”, artistas iniciante, mas não deixando de ser uma aliada das grandes indústrias devido a sua popularidade. Tamanha popularidade é vista pela velocidade de propagação de uma mensagem, pelo número de “curtidas”, comentários, compartilhamento e etc. O internauta passou a assumir uma postura ativa frente à rede. Hoje o consumidor/internauta é considerado como Consumer-Generated Media (CGM). Ou seja, ele gera conteúdo para os meios e plataformas e também os consome. Os sites se aliam as redes sociais, infundem ferramentas em suas estruturas que permitem uma participação maior do público e acabam agregando assim um sentimento de participação e empatia. Através de autores como Jenkins, Barbero e Gallego são embasados assuntos relacionados à convergência midiática, cultura participativa, consumo, cultura de massa e meios de comunicação e sobre a indústria fonográfica. Baseado nisso o presente trabalho pretende analisar o site como palco virtual para bandas iniciais, no caso específico a banda Boyce Avenue, e a que se deve tamanha popularidade em suas visualizações e de que forma a publicidade dos artistas é realizada nessa plataforma.
description: SOPCOM: Associação Portuguesa de Ciências da Comunicação, 2013: 8º SOPCOM: "Comunicação Global, Cultura e Tecnologia"