Melaena with Peutz-Jeghers syndrome: a case report

Introduction: Peutz-Jeghers syndrome (PJS) is a rare familial disorder characterised by mucocutaneous pigmentation, gastrointestinal and extragastrointestinal hamartomatous polyps and an increased risk of malignancy. Peutz-Jeghers polyps in the bowel may result in intussusception. This complication usually manifests with abdominal pain and signs of intestinal obstruction. Case Presentation: We report the case of a 24-year-old Caucasian male who presented with melaena. Pigmentation of the buccal mucosa was noted but he was pain-free and examination of the abdomen was unremarkable. Upper gastrointestinal endoscopy revealed multiple polyps. An urgent abdominal computed tomography (CT) scan revealed multiple small bowel intussusceptions. Laparotomy was undertaken on our patient, reducing the intussusceptions and removing the polyps by enterotomies. Bowel resection was not needed. Conclusion: Melaena in PJS needs to be urgently investigated through a CT scan even in the absence of abdominal pain and when clinical examination of the abdomen shows normal findings. Although rare, the underlying cause could be intussusception, which if missed could result in grave consequences

Magneto-optical studies of BaFe12O19 films grown by metallo-organic decomposition

M-type barium hexagonal ferrites BaFe12O19 (BaM) films considered for new devices that operate in the 40-70 GHz range with small or zero applied magnetic fields were characterized by magneto-optical (MO) complex polar “Kerr” effect (PKE) spectroscopy, MO magnetometry, and spectral ellipsometry (SE). The textured polycrystalline films were grown on Pt(111)/TiO2 template on Si wafer using metallo-organic decomposition technique (MOD) followed by rapid thermal annealing. In the films grown in one, two and three MOD iterations, the thickness was evaluated by SE and transmission electron microscopy. The film thickness ranged from 30 nm to 50 nm per MOD iteration. The best films display out-of-plane effective magnetic anisotropy field of 13 kOe, high perpendicular remanent magnetization and ferromagnetic resonance linewidth of 340 Oe at 60 GHz. The coercivity deduced from the MO hysteresis loops ranged between 0.25 kOe and 0.52 kOe. The SE and PKE spectra were taken at photon energies from 0.7 eV to 6.4 eV and from 1.2 eV to 4.8 eV, respectively. The PKE spectra display the structure observed on BaM single crystal natural faces normal to the c-axis. They are consistent with magnetoplumbite structure, with high degree of grain c-axis ordering, absence of foreign phases and Fe valence-exchange mechanism. Single phase nature of the films was further confirmed by grazing incidence X-ray diffraction and 57Fe nuclear magnetic resonance at 4.2 K.Web of Science561330132

Giant magnetic enhancement in Fe/Pd films and its influence on the magnetic interlayer coupling

The magnetic properties of thin Pd fcc(001) films with embedded monolayers of Fe are investigated by means of first principles density functional theory. The induced spin polarization in Pd is calculated and analyzed in terms of quantum interference within the Fe/Pd/Fe bilayer system. An investigation of the magnetic enhancement effects on the spin polarization is carried out and its consequences for the magnetic interlayer coupling are discussed. In contrast to {\it e.g.} the Co/Cu fcc(001) system we find a large effect on the magnetic interlayer coupling due to magnetic enhancement in the spacer material. In the case of a single embedded Fe monolayer we find aninduced Pd magnetization decaying with distance $n$ from the magnetic layer as ~$n^{-\alpha}$ with $\alpha \approx 2.4$. For the bilayer system we find a giant magnetic enhancement (GME) that oscillates strongly due to interference effects. This results in a strongly modified magnetic interlayer coupling, both in phase and magnitude, which may not be described in the pure Ruderman-Kittel-Kasuya-Yoshida (RKKY) picture. No anti-ferromagnetic coupling was found and by comparison with magnetically constrained calculations we show that the overall ferromagnetic coupling can be understood from the strong polarization of the Pd spacer

Políticas de mediatização e memória nos contextos urbanos

The present article explores the rules of acting and living in the urban space, on which the images inspired by sensitivity and competences connected with digital and web change are regularly superimposed. This “digital imagination” is such a prime mover that it becomes the dominant model of perception, being and acting in the world today. Its presence and influence are especially significant for constitution of the contemporary memory, as well as for the conditions and ways of using it. My reflections on the status of memory are situated within the dynamics of digital change occurring in the urban space, because it is there where the achievements of the digital revolution catch on with the pioneering speed and involvement. Cities of postmodern fate decided through in categories as: identity, culture of places and space, and memory.Este artículo explora las normas de interacción y convivencia en los espacios urbanos sobre los que las imágenes inspiradas por la sensibilidad y las competencias conectadas al cambio digital se imponen frecuentemente. Esta “imaginación digital” es una gran fuerza motriz que se torna el modelo de percepción dominante, de cómo ser o actuar en la actualidad. Su presencia e influencia son particularmente importantes para la constitución de la memoria contemporánea, así como para sus condiciones y usos. Mis reflexiones sobre este estado de la memoria se sitúan en las dinámicas del cambio digital que sucede en los espacios urbanos, porque es allí donde los logros de la revolución digital se emparejan con la velocidad pionera y la participación. Ciudades con un destino postmoderno organizadas en categorías tales como: identidad, cultura de lugares y espacios y memoria.Este artigo explora as regras de interação e convivência nos espaços urbanos sobre os quais as imagens inspiradas na sensibilidade e as competências ligadas à mudança digital são frequentemente impostas. Esta “imaginação digital” es uma força tão grande que se torna o modelo de percepção dominante de como ser ou atuar atualmente. A sua  presença e influência são particularmente importantes para a constituição da memoria contemporânea, para suas condições e seus usos. As minhas reflexões sobre este estado da memória se contextualizam nas dinâmicas da mudança digital que acontece nos espaços urbanos, porque é ali onde os logros da revolução digital alcançam à velocidade pioneira e a participação. Cidades com destinos pós-modernos organizadas em categorias tipo: identidade, cultura de lugares e espaços, y memória

Influence of uncorrelated overlayers on the magnetism in thin itinerant-electron films

The influence of uncorrelated (nonmagnetic) overlayers on the magnetic properties of thin itinerant-electron films is investigated within the single-band Hubbard model. The Coulomb correlation between the electrons in the ferromagnetic layers is treated by using the spectral density approach (SDA). It is found that the presence of nonmagnetic layers has a strong effect on the magnetic properties of thin films. The Curie temperatures of very thin films are modified by the uncorrelated overlayers. The quasiparticle density of states is used to analyze the results. In addition, the coupling between the ferromagnetic layers and the nonmagnetic layers is discussed in detail. The coupling depends on the band occupation of the nonmagnetic layers, while it is almost independent of the number of the nonmagnetic layers. The induced polarization in the nonmagnetic layers shows a long-range decreasing oscillatory behavior and it depends on the coupling between ferromagnetic and nonmagnetic layers.Comment: 9 pages, RevTex, 6 figures, for related work see: http://orion.physik.hu-berlin.d

Caracterização de juntas soldadas com aço carbono estrutural em processo GMAW

Orientador : Prof. Dr. Ramón Sigifredo Cortés Paredes.Monografia (especialização) - Universidade Federal do Paraná, Setor de Tecnologia, Curso de Especialização em Engenharia da Soldagem.Inclui referências: p. 36.Resumo : O presente relatório se propõe a demonstrar algumas das diferenças e semelhanças entre juntas soldadas com aços carbono estrutural (A36) e aço estrutural de alta resistência (A572) que são largamente utilizados na construção civil. Existem várias bitolas de perfis e espessuras de chapas no mercado. Os aços de alta resistência têm sido mais utilizados nos últimos anos devido a sua redução de custo (apenas 15% mais caro), muito mais resistente e soldabilidade equivalente. Também foram avaliados os gases de proteção CO2 e mistura Ar-CO2. Foi verificado que a penetração com CO2 puro foi bem superior enquanto que na mistura Ar-CO2 o nível de respingos foi menor e o acabamento foi superior o que torna mais indicado para carregamentos cíclicos.Abstract : This report demonstrate some of the differences and similarities between welds with structural carbon steels (A36) and high strength structural steel (A572) that are widely used in construction. There are several gauges of sheet thicknesses and profiles on the market. The high-strength steels have been used more in recent years due to its cost reduction (only 15% more expensive), much more sturdy and weldability equivalent

Conservatório de música em ruína industrial

Orientador: Key Imaguire JRMonografia (graduação) - Universidade Federal do Paraná, Setor de Tecnologia, Curso de Arquitetura e UrbanismoBibliografia: f. 125-129Resumo : A monografia propõe a implantação da sede definitiva do Conservatório Dramático Musical Maestro Paulino Martins Alves em parte do terreno das extintas Indústrias Wagner, localizado no município de Ponta Grossa – PR. O projeto visa a preservação das ruínas da antiga fábrica, a partir da proposta de reciclagem do edifício. Primeiramente, a fundamentação do trabalho perpassa pelo ensino da música ao longo do tempo. Autores, como Fonterrada, Albet e Schafer tratam da relação entre a música e outras artes. Já que o teatro, a poesia e a dança se apropriam de conceitos musicais, como a harmonia e o ritmo. São exploradas teorias e cartas sobre preservação de edifícios históricos, junto a estudos de caso nacionais e internacionais, como subsídios para o direcionamento do projeto. O patrimônio cultural participa da memória e consciência de um povo. Deste modo, a escolha de intervenção em um edifício industrial propicia o contraste entre música e máquinas. O ambiente se apresenta inspirador aos músicos, pela história que carrega. Por fim, o trabalho relata a realidade do conservatório e das ruínas da indústria. O projeto prioriza as demandas atuais da escola de música, como a ampliação do número de salas e a setorização sonora dos espaço

Oscillatory Exchange Coupling and Positive Magnetoresistance in Epitaxial Oxide Heterostructures

Oscillations in the exchange coupling between ferromagnetic $La_{2/3}Ba_{1/3}MnO_3$ layers with paramagnetic $LaNiO_3$ spacer layer thickness has been observed in epitaxial heterostructures of the two oxides. This behavior is explained within the RKKY model employing an {\it ab initio} calculated band structure of $LaNiO_3$, taking into account strong electron scattering in the spacer. Antiferromagnetically coupled superlattices exhibit a positive current-in-plane magnetoresistance.Comment: 4 pages (RevTeX), 5 figures (EPS