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Sample records for radial da retratibilidade

  1. Variação radial da retratibilidade e densidade básica da madeira de Eucalyptus saligna Sm. Radial variation of shrinkage and specific gravity in Eucalyptus saligna Sm. wood

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    José Tarcísio da Silva Oliveira

    2003-06-01

    Full Text Available A ultra-estrutura e a composição química da madeira, bem como suas propriedades físicas e mecânicas, variam significativamente entre espécies, entre árvores de uma mesma espécie e, mesmo, entre diferentes partes de uma mesma árvore. Com este trabalho objetivou-se o estudo dos parâmetros de retratibilidade e de densidade básica da madeira Eucalyptus saligna, com idade de 16 anos, proveniente de talhões experimentais da EMBRAPA Florestas, de Colombo, Paraná. As amostras foram retiradas à altura do DAP de quatro posições eqüidistantes a partir da medula em direção à periferia, correspondendo a 0, 33, 66 e 100%, com dimensões nominais de 1,0 x 2,0 x 3,0 cm, sendo a última dimensão no sentido longitudinal. Elas foram mantidas em câmara fechada com ventilação, próximo de soluções salinas supersaturadas, com o objetivo de proporcionar diferentes condições de umidade relativa. Uma vez atingidas as distintas condições de umidade de equilíbrio, as amostras foram secas em estufa a 105 ºC e obtidos os dados de retratibilidade e densidade básica da madeira nas posições mencionadas. Constataram-se valores de contração volumétrica mais baixos na região medular, apresentando um acréscimo para as demais posições. Comportamento semelhante foi observado para os coeficientes das contrações lineares nas direções tangencial e radial. O fator anisotrópico foi consideravelmente mais elevado na região medular, decrescendo substancialmente em direção ao alburno. A densidade básica não mostrou sinais efetivos de estabilidade, apesar de mostrar tendência de aumento em direção à periferia do tronco.The ultra structure and chemical composition of wood, as well as its physical and mechanical properties vary significantly among species, trees of a given species and even among different parts of a given tree. This work aimed to study the parameters of shrinkage and basic density of 16-year-old Eucalyptus saligna wood

  2. EFICIÊNCIA DE UM RESÍDUO DE ORIGEM PETROLÍFERA SOBRE A ESTABILIDADE DIMENSIONAL DA MADEIRA DE Pinus sp. (pinus E Mimosa scabrella Bentham (bracatinga

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    Alexandre Florian da Costa

    2001-05-01

    Full Text Available Na busca de alternativas de uso para um resíduo de origem petrolífera conhecido como “LCO” (Liquid Cycle Oil, avaliou-se a sua capacidade de aumentar a estabilidade dimensional das madeiras de Pinus sp.(pinus e Mimosa scabrella Bentham (bracatinga. Esse resíduo foi testado na sua composição original e diluído em querosene comercial, em diferentes proporções. Foram avaliados a variação dimensional nos 3 eixos anatômicos, a variação volumétrica, o coeficiente de retratibilidade, anisotropia, e a variação da massa específica básica e a 12% de umidade, em diferentes etapas do estudo. Os resultados mostraram que não houve variação significativa da contração e inchamento máximos entre as amostras tratadas e as amostras não-tratadas (testemunhas, para ambas as espécies, ao nível de 5% de probabilidade. No entanto, observou-se uma redução no coeficiente de retratibilidade, com o aumento da concentração de LCO, para ambas espécies. De um modo geral, dentre as duas espécies estudadas, o pinus foi a que apresentou os menores valores dos índices avaliados. Os coeficientes de retratibilidade e anisotropia da bracatinga foram superiores aos do pinus, apesar da diferença não significativa entre as amostras tratadas e as testemunhas. Esses resultados indicam ter havido uma variação mínima entre as faces tangencial e radial, possivelmente por meioi de uma pobre penetração do LCO na parede celular. Como conseqüência, esse resultado pode estar relacionado ao fraco desempenho do produto químico testado, não conseguindo promover uma boa estabilidade dimensional da madeira de ambas as espécies. O aumento da concentração de LCO possibilitou um aumento na massa específica a 12% de umidade para ambas espécies. Esse resultado pode estar associado à presença de parte do produto remanescente nas paredes do lúmen celular e canais resiníferos. A aparência externa da madeira tratada foi outro fator restritivo ao uso

  3. Radial variation of wood anatomy and basic density of Anadenanthera colubrina (Vell. Brenan. Variação radial da anatomia e densidade básica da madeira de Anadenanthera colubrina (Vell. Brenan.

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    Eduardo Luiz LONGUI

    2014-12-01

    Full Text Available We investigated wood samples of five Anadenanthera colubrina trees, aiming to study radial variation of anatomy and basic density. The trees were cut from “lote 5 do Rodoanel trecho sul” in Embu municipality, State of São Paulo, where vegetation is classified as Montane Ombrophilous Dense Forest and climate is classified as Cwa. We cut discs from the diameter at breast height ‒ DBH, and then cut samples from pith-to-bark to anatomical and basic density analysis. The results suggest that Anadenanthera colubrina has a very common anatomical and basic density radial variation pattern from pith-to-bark between hardwoods with an increase in vessel diameter favoring hydraulic conductivity, fiber wall thickness and length, ray height and width, and basic density. While the negative relationship between vessel diameter and frequency is well reported for many species, it has not been observed in A. colubrina because vessel frequency oscillates radially. This typical radial pattern also occurs in other native species in planting conditions, already demonstrated by our group in other studies, obviously with some changes depending on species. Investigamos amostras de madeira de cinco árvores de Anadenanthera colubrina objetivando estudar a variação radial da anatomia e densidade básica. As árvores foram cortadas no lote 5 do Rodoanel trecho sul, no município de Embu, com a vegetação de Floresta Ombrófila Densa Montana e clima do tipo Cwa. Cortamos discos à altura do peito ‒ DAP e destes obtivemos amostras radiais da medula para a casca, destas preparamos amostras para a determinação anatômica e da densidade básica. Os resultados sugerem que Anadenanthera colubrina apresenta um padrão radial de variação bastante comum no sentido medula-casca para as angiospermas arbóreas, com aumento no diâmetro dos vasos, consequentemente condutividade hidráulica, comprimento e espessura da parede da fibra, altura e largura do raio e densidade b

  4. Valor da oximetria de pulso na avaliação da perfusão da mão para retirada da artéria radial: O teste de Allen é satisfatório?

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    Renato Bauab DAUAR

    1998-07-01

    Full Text Available Com o crescimento da utilização da artéria radial como enxerto em operações de revascularização tornou-se importante a avaliação fidedigna da integridade da arcada palmar em cada paciente a fim de se prevenir complicações vasculares da mão. Classicamente, utiliza-se para esta finalidade o teste de Allen, que é baseado em avaliação subjetiva da coloração da mão ao se comprimir os pulsos radial e ulnar e, portanto, mais sujeitos a erros de interpretação. Com a finalidade de avaliação objetiva, propusemos a realização do teste, analisando-se a perfusão através da oximetria de pulso, método simples e facilmente disponível em centro cirúrgico. Objetivo: Os autores apresentam uma nova proposta para avaliação da perfusão e integridade da arcada palmar com a utilização do oxímetro de pulso e comparam os dados obtidos por este método com os do teste de Allen. Método: Foram estudadas 50 artérias radiais, 50 artérias ulnares de 25 pacientes em decúbito dorsal, com idade igual ou superior a 45 anos, sendo 19 do sexo masculino e 6 do sexo feminino, em condições cardio-respiratórias estáveis e sem alterações vasculares periféricas conhecidas em membros superiores. O oxímetro utilizado foi o da marca Ohmeda, sendo o Doppler portátil de fluxo contínuo da Medical Eletronics. A princípio colocou-se o dedal do oxímetro no dedo indicador de cada mão anotando-se a saturação que chamamos de inicial. Verificou-se ao Doppler os pulsos radial e ulnar. Foi realizado o teste de Allen em cada mão comprimindo-se digitalmente ambas as artérias, com o oxímetro no 2º dedo e observando-se o desaparecimento da onda de pulso. Após isso, descomprimiu-se a artéria ulnar retornando a onda de pulso e medindo-se a saturação final. Houve queda de 0 a 2 pontos, no valor da saturação, em 96% dos casos. O Doppler foi utilizado distalmente à compressão da artéria radial mostrando não haver fluxo nesta artéria. Resultado

  5. Propriedades físico-mecânicas da madeira de canafístula aos 10 anos de idade Physical and mechanical properties of 10 years old wood trees of canafístula

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    Magnos Alan Vivian

    2010-05-01

    Full Text Available A presente pesquisa objetivou caracterizar as propriedades físico-mecânicas da madeira de canafístula (Peltophorum dubium (Spreng. Taub. proveniente de árvores com 10 anos, por meio da determinação da massa específica básica, da retratibilidade, do módulo de elasticidade e do módulo de ruptura em flexão estática, do módulo de elasticidade em compressão perpendicular, da resistência máxima à compressão paralela à grã, da dureza de Janka, da resistência máxima ao cisalhamento e da resistência ao choque. A determinação da massa específica básica e da retratibilidade seguiu as normas COPANT 30:1-004 (1971 e 30:1-005 (1971, respectivamente, e os ensaios mecânicos seguiram as normas ASTM D 143-94 (2000 e NF B 51-009 (1942. A massa específica básica e o coeficiente de anisotropia encontrado para a espécie permitiram classificar sua madeira como leve e medianamente estável, respectivamente; já os valores médios das propriedades mecânicas encontradas definem a madeira como de resistência fraca a média. As características tecnológicas determinadas indicam que sua madeira, quando proveniente de plantios jovens, deve ser utilizada com cautela em situações que exijam elevada estabilidade dimensional e resistência mecânica, sendo, portanto, aconselhável seu corte em idades mais avançadas.This research aimed to characterize the physic-mechanical properties of the canafístula wood (Peltophorum dubium (Spreng. Taub. from 10 years' old trees. There was determined the specific gravity, shrinkage, modulus of elasticity and modulus of rupture in static bending, modulus of elasticity in compression perpendicular to the grain, compression strength parallel to the grain, hardness, shear and impact resistance. Specific gravity and shrinkage determination were conducted according to COPANT 30:1:004 (1971 and 30:1-005 (1971, respectively, and the mechanical tests followed ASTM D 143-94 (2000 and NF B51-009 (1942. The specific

  6. Aneurisma sacular da artéria radial: a propósito de um caso clínico Sacular aneurysm of the radial artery: a case report

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    Nádia Duarte

    2011-06-01

    Full Text Available Os aneurismas da artéria radial são raros e esporádicos, sendo que os pseudoaneurismas são mais frequentes do que os aneurismas verdadeiros e maioritariamente de configuração sacular. A etiologia é variada e diferenciam-se de outros diagnósticos pela pulsação e frémito. Raramente se complicam de ruptura, sendo a trombose e embolização as principais complicações. Dos casos publicados sobre aneurismas verdadeiros da artéria radial, apenas um está descrito como sendo secundário a lesão ocupacional repetitiva, sendo a maioria de causa idiopática. Os autores descrevem um caso de uma mulher de 63 anos, referenciada à consulta de Cirurgia Vascular por crescimento de massa pulsátil na tabaqueira anatómica da mão esquerda. O estudo por eco-doppler e angiografia, confirmaram o diagnóstico de aneurisma sacular da artéria radial, com 20 mm de maior eixo, arcada palmar permeável e sem sinais de embolização distal. Foi submetida a aneurismectomia parcial com laqueação dupla proximal e distal e endoaneurismorrafia. A cirurgia e pós-operatório decorreram sem complicações, nomeadamente complicações isquémicas. A propósito desde caso clínico, discute-se a abordagem diagnóstica e opções terapêuticas.Radial artery aneurysms are sporadic and rare, pseudoaneurysms are more common than true aneurysms, mainly in saccular configuration. The etiology is varied and difference from other diagnostics is done by the presence of pulse and thrill. Thrombosis and embolization are the main complications, while rupture is rare. From the reported cases of true aneurysms of the radial artery, only one is described as being secondary to repetitive occupational injury, the majority being idiopathic. The authors describe the case of a 63 year old woman, referred to a Vascular Surgery consultation because of a growing pulsatile mass in the anatomical snuffbox of the left hand. The Doppler and Angiography studies confirmed the diagnosis of

  7. Enxertos arteriais na cirurgia de revascularização do miocárdio: papel da artéria radial Arterial grafts in CABG: the role of radial artery

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    Armando Bocchi BARLEM

    2001-03-01

    Full Text Available Devido aos baixos índices de permeabilidade dos enxertos de veia safena, a utilização de artérias como enxerto para revascularizar o miocárdio vem sendo muito testada e tem ganho espaço. A revascularização da descendente anterior com a artéria torácica interna esquerda é padrão-ouro neste procedimento e é realizada rotineiramente na maioria dos Serviços do mundo há pelo menos 15 anos. Além disso, existem evidências de que o acréscimo de outro enxerto arterial ao tratamento pode diminuir a morbi-mortalidade tanto intra-hospitalar quanto a longo prazo (10 anos. Na escolha do 2º enxerto, a artéria radial tem se destacado com bons índices de permeabilidade a médio prazo (84-92% comparada com safena: 70-80% em 5 anos. O vasoespasmo, fenômeno inerente aos condutos arteriais, ocorre em 5 a 10% dos enxertos de radial. A nitroglicerina e os nitratos são as drogas mais eficazes no seu controle e os bloqueadores do cálcio não têm benefício clínico comprovado. Na avaliação da circulação do arco palmar para prevenção de isquemia do membro operado, o Teste de Allen tem sido satisfatório. Parece razoável, portanto, sugerir a associação de outro enxerto arterial à artéria torácica esquerda na tentativa de melhorar os resultados da CRM e que este enxerto seja a artéria radial.Because of the low patency rate of saphenous vein grafts, the use of arterial grafts for myocardial revascularization has been increased. The revascularization of the left anterior descending coronary (LAD with the left internal thoracic artery (ITA is the gold standard in almost all centers in the last 15 years. There are also evidences that one additional arterial graft decrease short and long-term (10 years morbi-mortality. Radial artery is an excellent choice for the second arterial graft because of good midterm patency (84-92% vs 70-80% of saphenous vein in 5 years. Spasm, a potential problem in arterial grafts, occurs in 5 to 10% of radial

  8. Segurança da ceratectomia fotorrefrativa com mitomicina-C para o tratamento de hipermetropia após ceratotomia radial Safety of photorefractive keratectomy with mitomycin-C for the treatment of hyperopia after radial keratotomy

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    Ramon Coral Ghanem

    2010-04-01

    Full Text Available OBJETIVO: Analisar a segurança da ceratectomia fotorrefrativa (PRK com mitomicina-C (MMC em olhos com hipermetropia consecutiva à ceratotomia radial. MÉTODOS: Foram avaliados prospectivamente 60 olhos de 36 pacientes consecutivos, submetidos à ceratectomia fotorrefrativa personalizada pela frente de onda corneana com o laser Esiris Schwind. Realizaram-se desepitelização mecânica, seguida da fotoabla ção, e utilização de MMC 0,02% por 20 ou 40 segundos. Em 16 olhos (26,7% a MMC foi aplicada por 40 segundos. Estes foram submetidos a ablações mais profundas do que 100 micra ou apresentavam córneas submetidas a suturas prévias. Os pacientes foram acompanhados por um ano. RESULTADOS: O equivalente esférico (EE médio antes do PRK era +4,27 D ± 2,18 e a acuidade visual corrigida (AVcc média era 0,174 ± 0,139 (logMAR. O EE médio programado no laser foi +4,74 D ± 2,11, resultando em uma profundidade de ablação de 78 ± 28 µm (de 33 a 148. Não foram observadas complicações intraoperatórias. Após um ano observaram-se: EE médio de + 0,04 D ± 1,03 (pPURPOSE: To evaluate the safety of photorefractive keratectomy (PRK with mitomycin-C (MMC in eyes with hyperopia after radial keratotomy. METHODS: Sixty eyes of 36 consecutive patients treated with corneal wavefront-guided PRK using an Esiris-Schwind excimer laser were prospectively evaluated. Corneal epithelium was mechanically removed, followed by photoablation and use of 0.02% MMC for 20 or 40 seconds. In 16 eyes (26.7%, MMC was applied for 40 seconds. These eyes underwent ablations deeper than 100 micron or had previous corneal sutures. Patients were followedup for 12 months. RESULTS: The mean spherical equivalent (SE before PRK was +4.27 D ± 2.18, and the mean bestcorrected visual acuity (BCVA was 0.174 ± 0.139 (logMAR. The planned laser SE correction was +4.74 D ± 2.11, resulting in an ablation depth of 78 ± 28 µm (from 33 to 148. No intraoperative complications were

  9. Ceratectomia fotorrefrativa baseada em topografia para correção da hipermetropia secundária à ceratotomia radial Topographically-guided photorefractive keratectomy for the management of secondary hyperopia following radial keratectomy

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    Vinícius Coral Ghanem

    2007-10-01

    Full Text Available OBJETIVO: Descrever nova técnica de ceratectomia fotorrefrativa baseada em topografia para correção da hipermetropia secundária à ceratotomia radial. MÉTODOS: Estudo retrospectivo realizado em pacientes submetidos a ceratectomia fotorrefrativa baseada em topografia para a correção da hipermetropia secundária à ceratotomia radial. Os pacientes apresentavam, no mínimo, 3 dioptrias de hipermetropia no pré-operatório, e apresentavam acompanhamento mínimo de 3 meses. RESULTADOS: Neste estudo foram avaliados 24 olhos de 21 pacientes com idade entre 36 e 55 anos (média de 45,54 ± 6,03 anos. O período médio de acompanhamento foi de 7,71 ± 4,6 meses (variando de 3 a 17 meses. A média do EE no pré-operatório foi de +3.92 ± 1.57, com variação de +1,25 D a +7,75 D e após a ablação, a média foi -0,29 ± 1,43 variando de 3,75 D a +2,50 D (pPURPOSE: To describe a topographically guided photorefractive keratectomy technique for the management of secon dary hyperopia following radial keratectomy. METHODS: A retrospective study was carried out in patients where a topographically guided photorefractive keratectomy technique was performed for the management of secondary hyperopia following radial keratectomy. The patients had preoperatively at least 3 diopters of hyperopia. The minimum follow-up was 3 months. RESULTS: Twenty-four eyes of 21 patients were evaluated. The mean age was 45.54 ± 6.03 years (range 36 to 55 years. The average follow-up was 7.71 ± 4.6 months (range 3 to 17 months. Preoperatively the average spherical equivalent was +3.92 ± 1.57 (range +1.25 D to +7.75 D, and postoperatively it was -0.29 ± 1.43 (range -3.75 D to +2.50 D (p<0.01. Visual acuity of 20/25 or better was achieved in 45.83% of the eyes, 20/40 or better in 83.33% and 20/60 or better in 100%. All patients were satisfied with the results and stated subjective improvement in visual quality. CONCLUSION: Considering that it is a retreatment procedure

  10. Efeito da idade e da posição radial na densidade básica e dimensões dos traqueídeos da madeira de Pinus taeda L. Effect of age and of the radial position in the basic density and dimensions of the tracheids of the wood of Pinus taeda L.

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    Rita de Cássia SOUSA

    2007-12-01

    Full Text Available O Pinus taeda L. é uma conífera exóticacultivada no Brasil. A madeira dessa espécie éutilizada na construção civil, dormentes, laminação,postes, resina, celulose e serraria. A questão básicaabordada no presente trabalho foi verificar se aidade da árvore influencia na densidade básica enas dimensões dos traqueídeos da madeira eanalisar as possíveis variações dessas propriedades,no sentido medula-casca, ao longo do raio dastoras de P. taeda. As propriedades estudadas foram:densidade básica (DB, comprimento, diâmetro eespessura da parede dos traqueídeos em função daidade em relação à posição radial. As propriedadesem estudo foram determinadas no Laboratório deAnatomia e Qualidade da Madeira do InstitutoFlorestal do Estado de São Paulo. Foram amostradascinco árvores no DAP (diâmetro à altura do peito,1,30 m médio em cada uma das idades de 9, 13e 20 anos de populações comerciais da região deSengés/PR. Os resultados indicaram que a idade daárvore influencia diretamente nessas propriedadesque são diferenciadas na posição radial da madeirade P. taeda. Também foi observado que ocorreuuma correlação positiva alta entre a densidadebásica e o comprimento dos traqueídeos.The Pinus taeda L. is an exotic conifercultivated in Brazil. The wood of that species isused in civil constructions, sleepers, veneer, posts,resin, cellulose and sawmill. The subject approachedin the present work was to verify if the age of thetree influences in the basic density and in thedimensions of the tracheids of the wood and toanalyze the possible variations of those properties,in the sense from pith to bark, along the ray of thelogs of P. taeda. The studied properties were: basicdensity (DB, length, diameter and thickness ofthe wall of the tracheids in function of the agerelated with the radial position. The properties instudy were established in the Laboratory of Anatomyand Quality of the Wood of the Forestry Institute ofSão Paulo

  11. Influência de idade e da posição radial nas dimensões das fibras e dos vasos da madeira de Eucalyptus grandis Hill ex. Maiden Influence of age and radial position on fiber and vessel dimensions of Eucalyptus grandis Hill ex. Maiden wood

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    José de Castro Silva

    2007-12-01

    Full Text Available Objetivou-se neste trabalho avaliar a variação das dimensões das fibras e dos vasos da madeira de Eucalyptus grandis com quatro diferentes idades (10, 14, 20 e 25 anos, proveniente de talhões comerciais. A amostragem do material na árvore foi feita através da coleta de três discos, retirados da base e das extremidades das duas primeiras toras, ambas com o comprimento comercial de 3 m. De cada disco, retiraram-se cinco amostras, de dimensões 1,0 x 1,0 x 1,0 cm, tomadas de pontos eqüidistantes, correspondentes a 0; 25; 50; 75; e 100% da seção, no sentido radial medula-casca, fazendo-se a medição das fibras e dos vasos. Verificou-se, em todos os parâmetros, o efeito da idade e da variação radial, no sentido medula-casca, à exceção da largura e do diâmetro do lume das fibras; todos os demais parâmetros apresentaram correlação positiva.The objective of this work was to evaluate the variability of wood quantitative anatomical characteristics (fibers and vessels of Eucalyptus grandis of four different ages (10, 14, 20 and 25 years, obtained from commercial stands. Tree material sampling was collected from three disks in the bottom and top of the first two logs, both three m long. Five samples were collected from each disc at the pith-to-bark direction at 0, 25, 50, 75 and 100% of the radii. In all cases, age and pith-to-bark direction were observed to have a marked influence on all the assays, except for fiber lumen diameter and width; all the other parameters showed a positive correlation.

  12. Comparação da perviedade entre artéria radial e veia safena em pacientes em pós-operatório de cirurgia de revascularização miocárdica com retorno dos sintomas Comparison of patency between radial artery and saphenous vein in a coronary artery bypass grafting post operative with return of the symptoms

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    Herbert Coelho Hortmann

    2010-06-01

    Full Text Available OBJETIVO: Comparar a perviedade da artéria radial e veia safena em pacientes com retorno dos sintomas após cirurgia de revascularização do miocárdio (CRVM. MÉTODOS: Estudo retrospectivo. No período de janeiro de 1998 a dezembro de 2005, foram realizadas 469 CRVMs com o uso da artéria radial dentre os enxertos, no Hospital Vera Cruz, em Belo Horizonte/MG. Destes, 94 pacientes apresentaram alterações isquêmicas no pós-operatório recente ou tardio e foram reestudados com cineangiocoronariografia. Os enxertos foram divididos em três grupos: artéria torácica interna (ATI, artéria radial (AR e veia safena (VS, e foram estratificados segundo a gravidade das lesões: sem lesão grave (OBJECTIVE: To compare the radial artery and saphenous vein's patency in patients with recurrence of symptoms in a coronary artery bypass grafting (CABG. METHODS: Retrospective study. From January 1998 to December 2005, 469 CABGs were performed using the radial artery as a graft, in Vera Cruz Hospital in Belo Horizonte/ MG. Among the patients who underwent those surgeries, 94 presented ischemic changes in early or late postoperative period, which led them to be re-evaluated by coronary angiography. The grafts were divided in three groups: internal thoracic artery (ITA, radial artery (RA and saphenous vein (SV, and they were stratified according to the severity of injury: uninjured or patent (< 70%, severe obstruction (70 to 99% and occlusion. RESULTS: For the 94 patients in the study, 86 grafts of ITA, 94 of RA and 111 of SV were used. For the 86 ITA grafts, 73 (84.88% were found patent. For the 94 RA grafts, 55 (58.51% were found patent, and for the 111 SV grafts, 73 (65.76% were uninjured. A statistically significant difference (P= 0.001 was found between RA and SV grafts, with a higher patency found for VS graft. For the RA grafts, women presented a worse result concerning the RA patency (65.7% and 40.7%, with P = 0.006. Concerning coronary

  13. 3D simulation of the catalyst density radial distribution in a riser of the FCC unit; Simulacao 3D da distribuicao radial de densidade do catalisador num riser de uma unidade de FCC

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    Apolonio, Adelia M.; Santos, Valdemir A. dos; Finkler, Christine L.L. [Universidade Catolica de Pernambuco (UNICAP), Recife, PE (Brazil); Dantas, Carlos C. [Universidade Federal de Pernambuco (UFPE), Recife, PE (Brazil). Dept. de Energia Nuclear

    2008-07-01

    Local variations in the catalyst/vacuum gas oils mixing can lead to low conversions in some parts of a fluid cracking catalytic riser, while in other parts, high conversions will produce undesirable fuel gas and coke quantities. Knowledge of the apparent solid concentration in a cross-section of the riser is then essential. A computational program to generate tri dimensional graphics and level curves of the radial catalyst density in FCC risers was elaborated. The algorithm is based on determinations of the polynomial coefficients with aid of least square method and was tested with literature data, obtained by applications of nuclear technique of gamma radiation attenuation. The simulation results showed convergence with the experimental data. The precision of the mapping depends on the number of measurements and promote better conditions of diagnostic of the distribution catalyst type in the riser. (author)

  14. Seleção da artéria radial para utilização como enxerto aortocoronário: correlação cirúrgica x avaliação pré-operatória com ecocolor Doppler e fotopletismografia digital Radial artery selection as coronary artery bypass graft: surgical correlation vs preoperative evaluation by using echocolor Doppler and digital photoplethysmography

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    Melchior Luis LIMA

    2002-03-01

    Full Text Available OBJETIVO: Com o crescente uso da artéria radial como enxerto aortocoronário, torna-se necessário reavaliar os critérios utilizados para a seleção desse vaso no pré-operatório da cirurgia de revascularização miocárdica. O objetivo deste estudo foi correlacionar a avaliação da viabilidade do vaso pelo cirurgião cardíaco no per-operatório com o estudo de seleção da artéria radial pelos métodos não invasivos, como o ecocolor Doppler e a fotopletismografia digital. CASUÍSTICA E MÉTODOS: Foram estudadas, entre julho de 1998 e maio de 2000, 78 artérias radiais e 78 artérias ulnares de 39 pacientes selecionados para cirurgia de revascularização miocárdica. O estudo foi realizado bilateralmente, utilizando aparelhos de ultra-sonografia ATL-HDI 5000 e Acuson-Sequóia 512, e o aparelho de fotopletismografia Parks Vascular Mini-Lab Model 1052-C. A artéria radial foi considerada passível de ser utilizada como enxerto aortocoronário, quando preenchia os seguintes critérios: ausência de ateromatose ou oclusão da artéria radial e ulnar ipsilateral, diâmetro interno da artéria radial maior ou igual a 2,5mm, avaliados pelo ecocolor Doppler, e presença de onda de pulso em dois ou mais dígitos durante a compressão radial, avaliada pela fotopletismografia. RESULTADOS: Dentre as 78 artérias radiais estudadas, 64 (82% foram consideradas apropriadas para utilização como enxerto aortocoronário e 12 (18,7% não apropriadas. Dos 39 pacientes selecionados, 24 (61,5% foram submetidos à cirurgia de revascularização miocárdica com utilização da artéria radial e a correlação entre a viabilidade da artéria radial avaliada pelo cirurgião durante o per-operatório com a avaliação pré-operatória pelo ecocolor Doppler e pela fotopletismografia para seleção da artéria radial foi de 100%. A contra-indicação da retirada de 12 (18,7% artérias radiais levou à alteração do planejamento cirúrgico de dois pacientes

  15. Study of the combined radial post-feeding dispersion of the blowflies Chrysomya megacephala (Fabricius and C. albiceps (Wiedemann (Diptera, Calliphoridae Estudo da dispersão radial combinada de Chrysomya megacephala (Fabricius e C. albiceps (Wiedemann (Diptera, Calliphoridae

    Directory of Open Access Journals (Sweden)

    Leonardo Gomes

    2005-09-01

    Full Text Available Blowflies use discrete and ephemeral substrates to feed their larvae. After they run out of food, the larvae begin to disperse in order to find adequate places for pupation or additional food sources, a process named post-feeding larval dispersion. Some important aspects of this process were studied in a circular arena allowing the combined radial post-feeding dispersion from the center of the arena of C. albiceps and C. megacephala larvae. To determine the location of each pupa, the arena was divided in 72 identical sections starting from the center. The distance from the center, the depth and weight of each pupa were evaluated. Statistical tests were done to verify the relation between weight, depth and distance for pupation. From the total an average of 976 larvae released (488 for each species were collected considering both experiments 456 C. megacephala pupae and 488 of C. albiceps. This demonstrates that C. albiceps probably preyed on 32 C. megacephala larvae during post-feeding dispersion. The study of this dispersion process can be used to estimate the postmortem interval (PMI of human cadavers in legal medicine.As moscas- varejeiras utilizam-se de substratos discretos e efêmeros para alimentar suas larvas. Após deixarem o substrato alimentar, as larvas começam a dispersar em busca de locais adequados para pupação e fontes adicionais de alimento, um processo denominado dispersão larval pós-alimentar. Alguns aspectos importantes desse processo foram estudados em uma arena permitindo a dispersão radial combinada de larvas de C. megacephala e C. albiceps. Para determinar a localização de cada pupa, a arena foi dividida em 72 setores iguais começando do centro. A distância a partir do centro, a profundidade e o peso de cada pupa foram determinados. Testes estatísticos foram feitos para verificar a relação entre peso, profundidade e distância para pupação. De um total em média de 976 larvas soltas (488 de cada esp

  16. Radial Artery Aneurysm

    Directory of Open Access Journals (Sweden)

    Ali Fedakar

    2011-04-01

    Full Text Available Upper limb aneurysms are less frequently seen than the other aneurysm. Radial arterial aneurysm is usually associated with the trauma. Interventional procedures can cause pseudoaneurysm at the radial artery puncture sites. Radial artery aneurysm may cause the thromboembolic events at the fingers and the hand. We present a case of isolated radial arterial aneurysm with idiopathic origin.

  17. Utilização da artéria radial como segundo enxerto arterial em pacientes acima de 70 anos The use of the radial artery as the second choice for arterial graft in patients over 70 years of age

    Directory of Open Access Journals (Sweden)

    Joseph Fredric Whitaker

    2005-03-01

    Full Text Available OBJETIVO: Estudo retrospectivo para avaliar a morbi-mortalidade e a evolução hospitalar em pacientes com idade superior a 70 anos, submetidos à operação de revascularização do miocárdio com utilização da artéria radial como segundo enxerto arterial. MÉTODO: No período de agosto de 1994 a dezembro de 2002, foram realizadas 2487 cirurgias de revascularização do miocárdio no Instituto do Coração de Juiz de Fora. Dentre os pacientes operados, 476 tinham idade superior a 70 anos, sendo que em 36 (Grupo II foi utilizada a artéria radial como 2º enxerto arterial. O mesmo tipo de cirurgia foi realizado em 142 pacientes com idade inferior a 70 anos (Grupo I. Não foram incluídas neste estudo reoperações, cirurgias sem CEC ou com procedimentos associados. RESULTADOS: A média de idade do Grupo II foi 72,5 anos, a mortalidade hospitalar neste grupo de pacientes foi 6,0%, a incidência de complicações também foi baixa, comparável à observada no mesmo tipo de operação realizada em pacientes com idade inferior a 70 anos. CONCLUSÃO: Diante destes resultados, os autores acreditam que a artéria radial possa ser usada com segurança como 2º enxerto arterial em pacientes acima de 70 anos, criteriosamente selecionados, apesar do maior risco de co-morbidades associadas nesta faixa etária.OBJECTIVE: Retrospective study eveluating the morbid-mortality and hospital behaviour in patients over 70-years -od patients submitted to myocardial revascularization involving the radial artery as the second arterial graft. METHOD: During the period of August 1994 to December 2002, 2487 cases of myocardial revascularization were performed by the group of the Juiz de Fora Heart Institute, 476 of whom were 70 years of age or older and 36 (Group II received the radial artery as the second arterial graft. The same type of surgery was performed in 142 patients under 70-year-old (Group I. Reoperations, off-pump operations (OPCAB or associated procedures

  18. Hipermetropia após ceratotomia radial: flutuação da refração e da acuidade visual entre manhã e tarde e correlações com a pressão ocular e o estado biomecânico da córnea

    Directory of Open Access Journals (Sweden)

    Renato Ambrósio Jr

    2012-06-01

    Full Text Available OBJETIVO: Verificar as variações entre manhã e tarde da refração, da acuidade visual, das medidas da pressão ocular e dos parâmetros biomecânicos da córnea em pacientes operados de ceratotomia radial e interesse em retratamento refrativo; correlacionar os parâmetros biomecânicos da córnea com a refração, com a acuidade visual e com as suas variações. MÉTODOS: Foram examinados trinta e oito olhos de 19 pacientes pela manhã (9 am e à tarde (6 pm, obtendo-se refração esfero-cilíndrica dinâmica, acuidade visual (logMAR sem correção (AVsc e corrigida (AVcc e parâmetros do ORA (Ocular Response Analyzer: histerese corneana (corneal hysteresis - CH, fator de resistência da córnea (corneal resistance factor - CRF, pressão intraocular (intraocular pressure &- IOP calibrada para o padrão Goldmann (IOPg e pressão compensada da córnea (IOPcc. Considerando a não distribuição normal das variáveis (teste de Kolmogorov-Smirnov, o teste de Wilcoxon signed rank foi utilizado para verificar significância nas diferenças entre as medidas da manhã e as da tarde de cada variável. O teste de Spearman foi utilizado para verificar correlações das medidas do ORA com o estado refracional e com a acuidade visual pela manhã e à tarde, assim como para verificar as correlações entre as medidas do ORA pela manhã e à tarde e as variações da refração e da acuidade visual. RESULTADOS: Grau esférico (E, equivalente esférico (EE, equivalente desfoco (ED, AVsc, IOPcc e IOPg variaram significativamente (Wilcoxon, p<0,05 entre manhã e tarde, havendo maior hipermetropia, pior acuidade visual não corrigida, maior pressão ocular e menor CH pela manhã. Nas medidas pela manhã, observaram-se correlações positivas (Spearman, p<0,05 do EE e do ED com IOPcc (rs=0,39 e 0,34 respectivamente, mas não com IOPg. Nas medidas da tarde, não houve correlações significantes entre os parâmetros refracionais e os pressóricos. Observaram

  19. Percepção e processamento visual da forma em humanos: filtros de freqüências radiais de 1 e 4 cpg Perception and visual processing of form in humans: radial frequency filters of 1 and 4 cpd

    Directory of Open Access Journals (Sweden)

    Natanael Antonio dos Santos

    2002-01-01

    Full Text Available O objetivo deste trabalho foi mensurar curvas de resposta ao contraste para os filtros de freqüências radiais de banda estreita de 1 e 4 cpg para padrões espaciais modulados pela função cilíndrica de Bessel (J0. Foram estimadas 15 curvas para cada filtro com o paradigma psicofísico de somação de resposta de supra-limiar aliado ao procedimento da escolha forçada. Participaram deste experimento 5 voluntários adultos com acuidade visual normal ou corrigida. Os resultados demonstraram somações máximas de limiar de contraste na freqüência de teste dos filtros de 1 e 4 cpg circundadas por inibições nas freqüências vizinhas às freqüências radiais de teste de cada filtro. Estes resultados são consistentes com a existência de filtros de freqüências radiais de banda estreita operando no sistema visual humano através do processo de somação ou inibição em faixa de freqüências específicas.The aim of this work was to measure narrow-band frequency response curves for two radial frequency filters, spatial stimuli modulated by cylindrical Bessel profiles, J0, whose test frequencies were 1 and 4 cpd. Five humans observers with normal or corrected visual acuity measured 15 curves for each filter with a supra-threshold response summation psychophysics method allied within a forced-choice paradigm. The results showed maximum summation effects at test frequency for filters 1 and 4 cpd surrounded on both sides by strong inhibition. These results are consistent with the existence of narrow-band radial frequency filters operating in human visual system either through summation or inhibition of specific frequency ranges.

  20. Caracterização Físico-Mecânica da Madeira Jovem de Eucalyptus camaldulensis para Aplicação na Arquitetura Rural

    Directory of Open Access Journals (Sweden)

    Pablo Marcel de Arruda Torres

    Full Text Available O objetivo deste trabalho foi analisar a qualidade da madeira de árvores jovem de Eucalyptus camaldulensis plantada em Rio Tinto, Paraíba, para sua utilização na arquitetura rural. Foram realizados ensaios físico-mecânicos, por meio da caracterização simplificada da madeira. Nos ensaios físicos foram obtidos o teor de umidade, massa específica básica e aparente e retratibilidade da madeira, além do coeficiente de anisotropia; e no ensaio mecânico para a tomada da compressão paralela às fibras foram utilizados transdutores de deslocamento linear (LVDTs acoplados à amostra e ao sistema de aquisição de dados para a determinação dos valores de resistência e rigidez da madeira. Os valores obtidos demonstraram que a madeira jovem de E. camaldulensis se enquadra na classificação de resistência C 20 para madeiras de folhosas, determinada pela Norma Brasileira, não sendo recomendada para fins estruturais, porém pode ser aplicada em elementos secundários de arquitetura rural, como cercas, parques e mobiliário rural.

  1. Triple acting radial seal

    Science.gov (United States)

    Ebert, Todd A [West Palm Beach, FL; Carella, John A [Jupiter, FL

    2012-03-13

    A triple acting radial seal used as an interstage seal assembly in a gas turbine engine, where the seal assembly includes an interstage seal support extending from a stationary inner shroud of a vane ring, the interstage seal support includes a larger annular radial inward facing groove in which an outer annular floating seal assembly is secured for radial displacement, and the outer annular floating seal assembly includes a smaller annular radial inward facing groove in which an inner annular floating seal assembly is secured also for radial displacement. A compliant seal is secured to the inner annular floating seal assembly. The outer annular floating seal assembly encapsulates the inner annular floating seal assembly which is made from a very low alpha material in order to reduce thermal stress.

  2. Perfil radial e uniformidade de precipitação do aspersor NaanDanJain 427, em função da regulagem do defletor Radial profile and precipitation uniformity of sprinkler NaanDanJain 427, depending on the setting of the deflector

    Directory of Open Access Journals (Sweden)

    Paulo E. S. Martins

    2012-01-01

    Full Text Available Neste trabalho o objetivo foi avaliar o perfil radial e a uniformidade de distribuição de água do aspersor fabricado pela empresa NaanDanJain, modelo 427 1/2"M e bocal de 2,8 mm de diâmetro interno, operando com pressões de 150, 200, 300 e 400 kPa em cinco posições do defletor de ajuste (0, 20, 50, 80 e 100%. Para a determinação dos parâmetros avaliados utilizou-se o método da malha e, com o auxílio do aplicativo computacional CATCH 3D, calculou-se a sobreposição das lâminas de água com dez espaçamentos. Os resultados obtidos demonstram que o defletor de ajuste influencia o raio de molhamento e o perfil de distribuição enquanto a uniformidade de aplicação de água se mostrou como mecanismo importante, visto que permite comportamento diferenciado para o aspersor, garantindo ampla faixa de utilização do equipamento.The study aimed to evaluate the radial profile and the uniformity of water distribution of sprinkler manufactured by the company NaanDanJain, model 427 1/2"M and nozzle with 2.8 mm of internal diameter, operating at pressures of 150, 200, 300 and 400 kPa and five positions of the deflector (0, 20, 50, 80 and 100%. For the determination of the parameters evaluated, the grid method was used and with the help of computer application CATCH 3D, overlapping layers of water depths was calculated with ten spacing. The results show that the deflector adjustment influences the radius of wetness and the distribution profile while the uniformity of water application showed as an important mechanism, since it permits different behavior for the sprinkler, ensuring wide track of utilization of the equipment.

  3. [Approaches to radial shaft].

    Science.gov (United States)

    Bartoníček, J; Naňka, O; Tuček, M

    2015-10-01

    In the clinical practice, radial shaft may be exposed via two approaches, namely the posterolateral Thompson and volar (anterior) Henry approaches. A feared complication of both of them is the injury to the deep branch of the radial nerve. No consensus has been reached, yet, as to which of the two approaches is more beneficial for the proximal half of radius. According to our anatomical studies and clinical experience, Thompson approach is safe only in fractures of the middle and distal thirds of the radial shaft, but highly risky in fractures of its proximal third. Henry approach may be used in any fracture of the radial shaft and provides a safe exposure of the entire lateral and anterior surfaces of the radius.The Henry approach has three phases. In the first phase, incision is made along the line connecting the biceps brachii tendon and the styloid process of radius. Care must be taken not to damage the lateral cutaneous nerve of forearm.In the second phase, fascia is incised and the brachioradialis identified by the typical transition from the muscle belly to tendon and the shape of the tendon. On the lateral side, the brachioradialis lines the space with the radial artery and veins and the superficial branch of the radial nerve running at its bottom. On the medial side, the space is defined by the pronator teres in the proximal part and the flexor carpi radialis in the distal part. The superficial branch of the radial nerve is retracted together with the brachioradialis laterally, and the radial artery medially.In the third phase, the attachment of the pronator teres is identified by its typical tendon in the middle of convexity of the lateral surface of the radial shaft. The proximal half of the radius must be exposed very carefully in order not to damage the deep branch of the radial nerve. Dissection starts at the insertion of the pronator teres and proceeds proximally along its lateral border in interval between this muscle and insertion of the supinator

  4. Radial wedge flange clamp

    Science.gov (United States)

    Smith, Karl H.

    2002-01-01

    A radial wedge flange clamp comprising a pair of flanges each comprising a plurality of peripheral flat wedge facets having flat wedge surfaces and opposed and mating flat surfaces attached to or otherwise engaged with two elements to be joined and including a series of generally U-shaped wedge clamps each having flat wedge interior surfaces and engaging one pair of said peripheral flat wedge facets. Each of said generally U-shaped wedge clamps has in its opposing extremities apertures for the tangential insertion of bolts to apply uniform radial force to said wedge clamps when assembled about said wedge segments.

  5. Radially truncated galactic discs

    NARCIS (Netherlands)

    de Grijs, R; Kregel, M; Wesson, KH

    2001-01-01

    We present the first results of a systematic analysis of radially truncated exponential discs for four galaxies of a complete sample of disc-dominated edge-on spiral galaxies. The discs of our sample galaxies are truncated at similar radii on either side of their centres. With the possible exception

  6. Radially truncated galactic discs

    NARCIS (Netherlands)

    Grijs, R. de; Kregel, M.; Wesson, K H

    2000-01-01

    Abstract: We present the first results of a systematic analysis of radially truncatedexponential discs for four galaxies of a sample of disc-dominated edge-onspiral galaxies. Edge-on galaxies are very useful for the study of truncatedgalactic discs, since we can follow their light distributions out

  7. Radial Halbach Magnetic Bearings

    Science.gov (United States)

    Eichenberg, Dennis J.; Gallo, Christopher A.; Thompson, William K.

    2009-01-01

    Radial Halbach magnetic bearings have been investigated as part of an effort to develop increasingly reliable noncontact bearings for future high-speed rotary machines that may be used in such applications as aircraft, industrial, and land-vehicle power systems and in some medical and scientific instrumentation systems. Radial Halbach magnetic bearings are based on the same principle as that of axial Halbach magnetic bearings, differing in geometry as the names of these two types of bearings suggest. Both radial and axial Halbach magnetic bearings are passive in the sense that unlike most other magnetic bearings that have been developed in recent years, they effect stable magnetic levitation without need for complex active control. Axial Halbach magnetic bearings were described in Axial Halbach Magnetic Bearings (LEW-18066-1), NASA Tech Briefs, Vol. 32, No. 7 (July 2008), page 85. In the remainder of this article, the description of the principle of operation from the cited prior article is recapitulated and updated to incorporate the present radial geometry. In simplest terms, the basic principle of levitation in an axial or radial Halbach magnetic bearing is that of the repulsive electromagnetic force between (1) a moving permanent magnet and (2) an electric current induced in a stationary electrical conductor by the motion of the magnetic field. An axial or radial Halbach bearing includes multiple permanent magnets arranged in a Halbach array ("Halbach array" is defined below) in a rotor and multiple conductors in the form of wire coils in a stator, all arranged so the rotary motion produces an axial or radial repulsion that is sufficient to levitate the rotor. A basic Halbach array (see Figure 1) consists of a row of permanent magnets, each oriented so that its magnetic field is at a right angle to that of the adjacent magnet, and the right-angle turns are sequenced so as to maximize the magnitude of the magnetic flux density on one side of the row while

  8. Radial Head Fractures

    OpenAIRE

    Jordan, Robert W.; Jones, Alistair DR.

    2017-01-01

    Background: Radial head fractures are common elbow injuries in adults and are frequently associated with additional soft tissue and bone injuries. Methods: A literature search was performed and the authors’ personal experiences are reported. Results: Mason type I fractures are treated non-operatively with splinting and early mobilisation. The management of Mason type II injuries is less clear with evidence supporting both non-operative treatment and internal fixation. The degree of intra-arti...

  9. Radial Head Fractures

    Science.gov (United States)

    Jordan, Robert W.; Jones, Alistair DR.

    2017-01-01

    Background: Radial head fractures are common elbow injuries in adults and are frequently associated with additional soft tissue and bone injuries. Methods: A literature search was performed and the authors’ personal experiences are reported. Results: Mason type I fractures are treated non-operatively with splinting and early mobilisation. The management of Mason type II injuries is less clear with evidence supporting both non-operative treatment and internal fixation. The degree of intra-articular displacement and angulation acceptable for non-operative management has yet to be conclusively defined. Similarly the treatment of type III and IV fractures remain controversial. Traditional radial head excision is associated with valgus instability and should be considered only for patients with low functional demands. Comparative studies have shown improved results from internal fixation over excision. Internal fixation should only be attempted when anatomic reduction and initiation of early motion can be achieved. Authors have reported that results from fixation are poorer and complication rates are higher if more than three fragments are present. Radial head arthroplasty aims to reconstruct the native head and is indicated when internal fixation is not feasible and in the presence of complex elbow injuries. Overstuffing of the radiocapitellar joint is a frequent technical fault and has significant adverse effects on elbow biomechanics. Modular design improves the surgeon’s ability to reconstruct the native joint. Two randomised controlled trials have shown improved clinical outcomes and lower complication rate following arthroplasty when compared to internal fixation. Conclusion: We have presented details regarding the treatment of various types of radial head fractures - further evidence, however, is still required to provide clarity over the role of these different management strategies. PMID:29290880

  10. Radial multiresolution in dimension three.

    NARCIS (Netherlands)

    Rauhut, H.; Rösler, M.M.

    2005-01-01

    Abstract We present a construction of a wavelet-type orthonormal basis for the space of radial $L^2$-functions in {\\bf R}$^3$ via the concept of a radial multiresolution analysis. The elements of the basis are obtained from a single radial wavelet by usual dilations and generalized translations.

  11. ISR Radial Field Magnet

    CERN Multimedia

    1983-01-01

    There were 37 (normal) + 3 (special) Radial Field magnets in the ISR to adjust vertically the closed orbit. Gap heights and strengths were 200 mm and .12 Tm in the normal magnets, 220 mm and .18 Tm in the special ones. The core length was 430 mm in both types. Due to their small length as compared to the gap heights the end fringe field errors were very important and had to be compensated by suitably shaping the poles. In order to save on cables, as these magnets were located very far from their power supplies, the coils of the normal type magnets were formed by many turns of solid cpper conductor with some interleaved layers of hollow conductor directly cooled by circulating water

  12. Aneurisma idiopático de artéria radial: relato de caso Idiopathic radial artery aneurysm: case report

    Directory of Open Access Journals (Sweden)

    Luiz Ernani Meira Jr.

    2011-12-01

    Full Text Available Os aneurismas da artéria radial são extremamente raros. Em sua maioria, consistem de pseudoaneurismas pós-traumáticos. Os aneurismas da artéria radial verdadeiros podem ser idiopáticos, congênitos, pós-estenóticos ou associados a patologias, tais como vasculites e doenças do tecido conjuntivo. Foi relatado um caso de aneurisma idiopático de artéria radial em uma criança de três anos, que, após completa investigação diagnóstica complementar, foi submetida à ressecção cirúrgica.Radial artery aneurysms are extremely rare. Post-traumatic pseudoaneurysms are the vast majority. True radial artery aneurysms can be idiopathic, congenital, poststenotic, or associated with some pathologies, such as vasculitis and conjunctive tissue diseases. We report a case of an idiopathic aneurysm of the radial artery in a three-year-old child who was submitted to surgical resection after a complete diagnostic approach.

  13. Turbine with radial acting seal

    Energy Technology Data Exchange (ETDEWEB)

    Eng, Darryl S; Ebert, Todd A

    2016-11-22

    A floating brush seal in a rim cavity of a turbine in a gas turbine engine, where the floating brush seal includes a seal holder in which the floating brush seal floats, and a expandable seal that fits within two radial extending seal slots that maintains a seal with radial displacement of the floating brush seal and the seal holder.

  14. Radial gas turbine design

    Energy Technology Data Exchange (ETDEWEB)

    Krausche, S.; Ohlsson, Johan

    1998-04-01

    The objective of this work was to develop a program dealing with design point calculations of radial turbine machinery, including both compressor and turbine, with as few input data as possible. Some simple stress calculations and turbine metal blade temperatures were also included. This program was then implanted in a German thermodynamics program, Gasturb, a program calculating design and off-design performance of gas turbines. The calculations proceed with a lot of assumptions, necessary to finish the task, concerning pressure losses, velocity distribution, blockage, etc., and have been correlated with empirical data from VAT. Most of these values could have been input data, but to prevent the user of the program from drowning in input values, they are set as default values in the program code. The output data consist of geometry, Mach numbers, predicted component efficiency etc., and a number of graphical plots of geometry and velocity triangles. For the cases examined, the error in predicted efficiency level was within {+-} 1-2% points, and quite satisfactory errors in geometrical and thermodynamic conditions were obtained Examination paper. 18 refs, 36 figs

  15. Radial Characteristics Functions.

    Science.gov (United States)

    WISCONSIN UNIV MADISON MATHEMATICS RESEARCH CENTERRadial Characteristics Functions.Technical summary rept.,SAskey,Richard ;MRC-TSR-1262DA-31-124...ARO(D)-462*Fourier transformation, Measure theory, Bessel functions, TheoremsPolya theorem, * Characteristic functionsIn 1918 Polya proved that the...transform could be inverted, so that the function is positive definite, and if it is one when x is zero, it is a characteristic function. An extension of this result to n-dimensions is presented. (Modified author abstract)

  16. Dedicated radial ventriculography pigtail catheter

    Energy Technology Data Exchange (ETDEWEB)

    Vidovich, Mladen I., E-mail: miv@uic.edu

    2013-05-15

    A new dedicated cardiac ventriculography catheter was specifically designed for radial and upper arm arterial access approach. Two catheter configurations have been developed to facilitate retrograde crossing of the aortic valve and to conform to various subclavian, ascending aortic and left ventricular anatomies. The “short” dedicated radial ventriculography catheter is suited for horizontal ascending aortas, obese body habitus, short stature and small ventricular cavities. The “long” dedicated radial ventriculography catheter is suited for vertical ascending aortas, thin body habitus, tall stature and larger ventricular cavities. This new design allows for improved performance, faster and simpler insertion in the left ventricle which can reduce procedure time, radiation exposure and propensity for radial artery spasm due to excessive catheter manipulation. Two different catheter configurations allow for optimal catheter selection in a broad range of patient anatomies. The catheter is exceptionally stable during contrast power injection and provides equivalent cavity opacification to traditional femoral ventriculography catheter designs.

  17. Detonation in supersonic radial outflow

    KAUST Repository

    Kasimov, Aslan R.

    2014-11-07

    We report on the structure and dynamics of gaseous detonation stabilized in a supersonic flow emanating radially from a central source. The steady-state solutions are computed and their range of existence is investigated. Two-dimensional simulations are carried out in order to explore the stability of the steady-state solutions. It is found that both collapsing and expanding two-dimensional cellular detonations exist. The latter can be stabilized by putting several rigid obstacles in the flow downstream of the steady-state sonic locus. The problem of initiation of standing detonation stabilized in the radial flow is also investigated numerically. © 2014 Cambridge University Press.

  18. CONGENITAL RADIAL DYSPLASIA: A CASE REPORT

    Directory of Open Access Journals (Sweden)

    Venkatram Reddy

    2015-08-01

    Full Text Available Congenital radial dysplasia, also referred to as radial club hand , means deficiency along the preaxial or radial side of the extremity. It ranges from hypoplasia of the thumb to variou s degrees of radial hypoplasia. We present one such rare case of type 4 congenital unilateral isolated radial dysplasia with carpel anomaly , reported to our department in SVS medical C ollege, Mahabubanagar, Telangana state

  19. About "axial" and "radial" diffusivities.

    Science.gov (United States)

    Wheeler-Kingshott, Claudia A M; Cercignani, Mara

    2009-05-01

    This article presents the potential problems arising from the use of "axial" and "radial" diffusivities, derived from the eigenvalues of the diffusion tensor, and their interpretation in terms of the underlying biophysical properties, such as myelin and axonal density. Simulated and in vivo data are shown. The simulations demonstrate that a change in "radial" diffusivity can cause a fictitious change in "axial" diffusivity and vice versa in voxels characterized by crossing fibers. The in vivo data compare the direction of the principle eigenvector in four different subjects, two healthy and two affected by multiple sclerosis, and show that the angle, alpha, between the principal eigenvectors of corresponding voxels of registered datasets is greater than 45 degrees in areas of low anisotropy, severe pathology, and partial volume. Also, there are areas of white matter pathology where the "radial" diffusivity is 10% greater than that of the corresponding normal tissue and where the direction of the principal eigenvector is altered by more than 45 degrees compared to the healthy case. This should strongly discourage researchers from interpreting changes of the "axial" and "radial" diffusivities on the basis of the underlying tissue structure, unless accompanied by a thorough investigation of their mathematical and geometrical properties in each dataset studied. (c) 2009 Wiley-Liss, Inc.

  20. Radial head prosthesis: results overview.

    Science.gov (United States)

    Carità, E; Donadelli, A; Cugola, L; Perazzini, P

    2017-12-01

    Radial head replacement is frequently used in treatment of radial head fractures or sequela. Impossibility to restore a correct anatomy, acute elbow traumatic instability and failure of osteosynthesis hardware are the most common indications. The authors describe their case studies and results on the implantation of various radial head prostheses. Between June 2005 and June 2016, 28 radial head prostheses were implanted in the same number of patients with an average follow-up of 49 months (6-104). Indications for implantation were: Mason type III and IV radial head fractures and post-traumatic arthritis due to failure of previous treatments. Monopolar prostheses were used and were press-fit implanted via Kaplan's lateral access and Kocher's anconeus approach to the humeroradial joint. At the follow-up, assessments were made of the pain, according to the visual analogic scale, range of motion (ROM), stability and functionality according to the Mayo Elbow Performance Score, presence of osteolysis and mobilization during radiography tests, personal satisfaction of the patients, Disabilities of the Arm, Shoulder and Hand and Patient-Rated Wrist Evaluation outcomes measurements. At the follow-up, we recorded an average level of pain of 1.8 in patients under acute treatments for radial head fractures and a marked reduction in the remaining cases from 6.7 to 2.1. ROM was found on average to be 107° of flexion-extension and 159° of pronosupination. Personal satisfaction was good-excellent in 23 cases. There was no case of infection; removal of the implant was necessary in three cases due to mobilization of the stem and oversized implants. In six cases, bone resorption was seen at the level of the prosthetic collar and it was in all cases asymptomatic. The results of this study suggest that the use of prostheses, if well positioned, is a valid solution in the treatment of secondary arthritis and fractures of the radial head with poor prognosis, with good results in the

  1. Radial magnetic bearings: An overview

    Directory of Open Access Journals (Sweden)

    Weiyu Zhang

    Full Text Available Radial magnetic bearings (RMBs are one of the most commonly used magnetic bearings. They are used widely in the field of ultra-high speed and ultra-precise numerical control machine tools, bearingless motors, high speed flywheels, artificial heart pumps, and molecular pumps, and they are being strengthened and extended in various important areas. In this paper, a comprehensive overview is given of different bearing topologies of RMBs with different stator poles that differ in their construction, the driving mode of electromagnets, power consumption, cost, magnetic circuits, and symmetry. RMBs with different poles and couplings between the two bearing axes in the radial direction responsible for cross-coupling generation are compared. In addition, different shaped rotors are compared, as the performances of magnetic bearing-rotor systems are of great concern to rotor constructions. Furthermore, the parameter design methods, the mathematical models and control strategies of the RMBs are described in detail. From the comparison of topologies, models and control methods for RMBs, the advantages, disadvantages and utilizable perspectives are also analyzed. Moreover, several possible development trends of the RMBs are discussed. Keywords: Radial magnetic bearings (RMBs, Topologies, Mathematical mode, Control strategies, Development trends

  2. Velocidades radiales en Collinder 121

    Science.gov (United States)

    Arnal, M.; Morrell, N.

    Se han llevado a cabo observaciones espectroscópicas de unas treinta estrellas que son posibles miembros del cúmulo abierto Collinder 121. Las mismas fueron realizadas con el telescopio de 2.15m del Complejo Astronómico El Leoncito (CASLEO). El análisis de las velocidades radiales derivadas del material obtenido, confirma la realidad de Collinder 121, al menos desde el punto de vista cinemático. La velocidad radial baricentral (LSR) del cúmulo es de +17 ± 3 km.s-1. Esta velocidad coincide, dentro de los errores, con la velocidad radial (LSR) de la nebulosa anillo S308, la cual es de ~20 ± 10 km.s-1. Como S308 se encuentra físicamente asociada a la estrella Wolf-Rayet HD~50896, es muy probable que esta última sea un miembro de Collinder 121. Desde un punto de vista cinemático, la supergigante roja HD~50877 (K3Iab) también pertenecería a Collinder 121. Basándonos en la pertenencia de HD~50896 a Collinder 121, y en la interacción encontrada entre el viento de esta estrella y el medio interestelar circundante a la misma, se estima para este cúmulo una distancia del orden de 1 kpc.

  3. Countercurrent aortography via radial artery

    Energy Technology Data Exchange (ETDEWEB)

    Sohn, Hyung Kuk; Lee, Young Chun; Lee, Seung Chul; Jeon, Seok Chol; Joo, Kyung Bin; Lee, Seung Ro; Kim, Soon Yong [College of Medicine, Hanyang University, Seoul (Korea, Republic of)

    1987-06-15

    Countercurrent aortography via radial artery was performed for detection of aortic arch anomalies in 4 infants with congenital heart disease. Author's cases of aortic arch anomalies were 3 cases of PDA, 1 case of coarctation of aorta, and 1 case of occlusion of anastomosis site on subclavian artery B-T shunt. And aberrant origin of the right SCA, interrupted aortic arch, hypoplastic aorta, anomalous origin of the right pulmonary artery from the ascending aorta can be demonstrated by this method. Countercurrent aortography affords an safe and simple method for detection of aortic arch anomalies without retrograde arterial catheterization, especially in small infants or premature babies.

  4. Formulas for Radial Transport in Protoplanetary Disks

    Science.gov (United States)

    Desch, Steven J.; Estrada, Paul R.; Kalyaan, Anusha; Cuzzi, Jeffrey N.

    2017-05-01

    The quantification of the radial transport of gaseous species and solid particles is important to many applications in protoplanetary disk evolution. An especially important example is determining the location of the water snow lines in a disk, which requires computing the rates of outward radial diffusion of water vapor and the inward radial drift of icy particles; however, the application is generalized to evaporation fronts of all volatiles. We review the relevant formulas using a uniform formalism. This uniform treatment is necessary because the literature currently contains at least six mutually exclusive treatments of radial diffusion of gas, only one of which is correct. We derive the radial diffusion equations from first principles using Fick's law. For completeness, we also present the equations for radial transport of particles. These equations may be applied to studies of diffusion of gases and particles in protoplanetary and other accretion disks.

  5. Radial flow pulse jet mixer

    Science.gov (United States)

    VanOsdol, John G.

    2013-06-25

    The disclosure provides a pulse jet mixing vessel for mixing a plurality of solid particles. The pulse jet mixing vessel is comprised of a sludge basin, a flow surface surrounding the sludge basin, and a downcoming flow annulus between the flow surface and an inner shroud. The pulse jet mixing vessel is additionally comprised of an upper vessel pressurization volume in fluid communication with the downcoming flow annulus, and an inner shroud surge volume separated from the downcoming flow annulus by the inner shroud. When the solid particles are resting on the sludge basin and a fluid such as water is atop the particles and extending into the downcoming flow annulus and the inner shroud surge volume, mixing occurs by pressurization of the upper vessel pressurization volume, generating an inward radial flow over the flow surface and an upwash jet at the center of the sludge basin.

  6. Stirling Engine With Radial Flow Heat Exchangers

    Science.gov (United States)

    Vitale, N.; Yarr, George

    1993-01-01

    Conflict between thermodynamical and structural requirements resolved. In Stirling engine of new cylindrical configuration, regenerator and acceptor and rejector heat exchangers channel flow of working gas in radial direction. Isotherms in regenerator ideally concentric cylinders, and gradient of temperature across regenerator radial rather than axial. Acceptor and rejector heat exchangers located radially inward and outward of regenerator, respectively. Enables substantial increase in power of engine without corresponding increase in diameter of pressure vessel.

  7. Radial head button holing: a cause of irreducible anterior radial head dislocation

    Energy Technology Data Exchange (ETDEWEB)

    Shin, Su-Mi; Chai, Jee Won; You, Ja Yeon; Park, Jina [Seoul National University Seoul Metropolitan Government Boramae Medical Center, Department of Radiology, Seoul (Korea, Republic of); Bae, Kee Jeong [Seoul National University Seoul Metropolitan Government Boramae Medical Center, Department of Orthopedic Surgery, Seoul (Korea, Republic of)

    2016-10-15

    ''Buttonholing'' of the radial head through the anterior joint capsule is a known cause of irreducible anterior radial head dislocation associated with Monteggia injuries in pediatric patients. To the best of our knowledge, no report has described an injury consisting of buttonholing of the radial head through the annular ligament and a simultaneous radial head fracture in an adolescent. In the present case, the radiographic findings were a radial head fracture with anterior dislocation and lack of the anterior fat pad sign. Magnetic resonance imaging (MRI) clearly demonstrated anterior dislocation of the fractured radial head through the torn annular ligament. The anterior joint capsule and proximal portion of the annular ligament were interposed between the radial head and capitellum, preventing closed reduction of the radial head. Familiarity with this condition and imaging findings will aid clinicians to make a proper diagnosis and fast decision to perform an open reduction. (orig.)

  8. Optical modeling of radial keratotomy incision patterns.

    Science.gov (United States)

    Schwiegerling, J; Greivenkamp, J E; Miller, J M; Snyder, R W; Palmer, M L

    1996-12-01

    To determine the optical effects of higher-order corneal shape variations resulting from radial keratotomy. Videokeratoscopic height data were obtained postoperatively from several patients who had undergone radial keratotomy. For each of clear central zone sizes 3.00 mm, 4.00 mm, and 4.75 mm, two patients were chosen randomly from the larger study group. Data obtained 2 weeks postoperatively from these six patients were decomposed into the Zernike polynomials, and the low-order expansion terms were removed to disclose corneal height variations (the radial keratotomy artifact). The artifact was applied to a schematic eye model, and exact ray-tracing was used to evaluate visual performance, which was defined as a function of pupil diameter, optical zone (central clear zone) size, and radial keratotomy artifact centration. The radial keratotomy artifact degrades visual performance at midspatial frequencies more than it does at high spatial frequencies. This effect is most pronounced for smaller optical zones and for a pupil diameter of 4 mm. Visual performance remains nearly constant for small decentration (0.5 mm or less) of the radial keratotomy optical zone from the corneal apex. Residual refractive error, corneal asphericity, and the radial keratotomy artifact all affect visual performance after radial keratotomy. Isolated effects of the radial keratotomy artifact degrade visual performance, with the level of degradation dependent on pupil size, optical zone size, and centration of the procedure. More research is necessary to combine the radial keratotomy artifact with changes in corneal asphericity and to further quantify the optical effects of radial keratotomy.

  9. Concepts of radial and angular kinetic energies

    DEFF Research Database (Denmark)

    Dahl, Jens Peder; Schleich, W.P.

    2002-01-01

    We consider a general central-field system in D dimensions and show that the division of the kinetic energy into radial and angular parts proceeds differently in the wave-function picture and the Weyl-Wigner phase-space picture, Thus, the radial and angular kinetic energies are different quantities...

  10. Spectral distortion in a radially inhomogeneous cosmology

    Science.gov (United States)

    Caldwell, R. R.; Maksimova, N. A.

    2013-11-01

    The spectral distortion of the cosmic microwave background blackbody spectrum in a radially inhomogeneous space-time, designed to exactly reproduce a ΛCDM expansion history along the past light cone, is shown to exceed the upper bound established by COBE-FIRAS by a factor of approximately 3700. This simple observational test helps uncover a slew of pathological features that lie hidden inside the past light cone, including a radially contracting phase at decoupling and, if followed to its logical extreme, a naked singularity at the radially inhomogeneous big bang.

  11. Scintillating Lustre Induced by Radial Fins

    Directory of Open Access Journals (Sweden)

    Kohske Takahashi

    2012-02-01

    Full Text Available Radial lines of Ehrenstein patterns induce illusory scintillating lustre in gray disks inserted into the central gaps (scintillating-lustre effect. We report a novel variant of this illusion by replacing the radial lines with white and black radial fins. Both white and gray disks inserted into the central gaps were perceived as scintillating, if the ratio of the black/white fin width were balanced (ie, close to 1.0. Thus, the grayness of the central disk is not a prerequisite for the scintillation. However, the scintillation was drastically reduced when the ratio was imbalanced. Furthermore, the optimal ratio depended on the color of the center disks.

  12. Radial pseudoaneurysm following diagnostic coronary angiography

    Directory of Open Access Journals (Sweden)

    Shankar Laudari

    2015-06-01

    Full Text Available The radial artery access has gained popularity as a method of diagnostic coronary catheterization compared to femoral artery puncture in terms of vascular complications and early ambulation. However, very rare complication like radial artery pseudoaneurysm may occur following cardiac catheterization which may give rise to serious consequences. Here, we report a patient with radial pseudoaneurysm following diagnostic coronary angiography. Adequate and correct methodology of compression of radial artery following puncture for maintaining hemostasis is the key to prevention.DOI: http://dx.doi.org/10.3126/jcmsn.v10i3.12776 Journal of College of Medical Sciences-Nepal, 2014, Vol-10, No-3, 48-50

  13. Aberrant Radial Artery Causing Carpal Tunnel Syndrome

    Directory of Open Access Journals (Sweden)

    Zinon T. Kokkalis

    2016-07-01

    Full Text Available Anatomical vascular variations are rare causes of carpal tunnel syndrome. An aberrant medial artery is the most common vascular variation, while an aberrant radial artery causing carpal tunnel syndrome is even more rare, with an incidence ranging less than 3%. This article reports a patient with compression of the median nerve at the carpal tunnel by an aberrant superficial branch of the radial artery. An 80- year- old man presented with a 5-year history of right hand carpal tunnel syndrome; Tinel sign, Phalen test and neurophysiological studies were positive. Open carpal tunnel release showed an aberrant superficial branch of the radial artery with its accompanying veins running from radially to medially, almost parallel to the median nerve, ending at the superficial palmar arterial arch. The median nerve was decompressed without ligating the aberrant artery. At the last follow-up, 2 years after diagnosis and treatment the patient is asymptomatic.

  14. Aberrant Radial Artery Causing Carpal Tunnel Syndrome.

    Science.gov (United States)

    Kokkalis, Zinon T; Tolis, Konstantinos E; Megaloikonomos, Panayiotis D; Panagopoulos, Georgios N; Igoumenou, Vasilios G; Mavrogenis, Andreas F

    2016-06-01

    Anatomical vascular variations are rare causes of carpal tunnel syndrome. An aberrant medial artery is the most common vascular variation, while an aberrant radial artery causing carpal tunnel syndrome is even more rare, with an incidence ranging less than 3%. This article reports a patient with compression of the median nerve at the carpal tunnel by an aberrant superficial branch of the radial artery. An 80- year- old man presented with a 5-year history of right hand carpal tunnel syndrome; Tinel sign, Phalen test and neurophysiological studies were positive. Open carpal tunnel release showed an aberrant superficial branch of the radial artery with its accompanying veins running from radially to medially, almost parallel to the median nerve, ending at the superficial palmar arterial arch. The median nerve was decompressed without ligating the aberrant artery. At the last follow-up, 2 years after diagnosis and treatment the patient is asymptomatic.

  15. 21 CFR 866.4800 - Radial immunodiffusion plate.

    Science.gov (United States)

    2010-04-01

    ...) MEDICAL DEVICES IMMUNOLOGY AND MICROBIOLOGY DEVICES Immunology Laboratory Equipment and Reagents § 866.4800 Radial immunodiffusion plate. (a) Identification. A radial immunodiffusion plate for clinical use...

  16. Radial artery access for peripheral endovascular procedures.

    Science.gov (United States)

    Kumar, Avnee J; Jones, Lauren E; Kollmeyer, Kenneth R; Feldtman, Robert W; Ferrara, Craig A; Moe, Michelle N; Chen, Julia F; Richmond, Jasmine L; Ahn, Sam S

    2017-09-01

    The radial artery is often used for coronary angiography, with a demonstrated decrease in local complications and an increase in postoperative mobility of the patient. Data on radial artery access for peripheral endovascular procedures, however, are limited. We describe our experience with radial artery access for diagnostic and endovascular interventions. Between February 2012 and March 2015, there were 95 endovascular procedures performed using radial artery access in 80 unique patients. Demographic and clinical data were recorded. Perioperative, postoperative, and 30-day follow-up data were evaluated retrospectively for major and minor complications. Major adverse events included any immediate hospitalization admission, stroke, hand amputation, bleeding requiring transfusion, hematoma requiring surgery, and death. Minor complications included superficial bleeding and hematoma. The patients (52.6% male, 47.4% female) had a mean age of 72.1 ± 9.4 years. Radial artery access was used for diagnostic purposes in 15.8% of all procedures and for therapeutic intervention, including angioplasty and stenting, in 84.2%. The radial artery was the only access point in 80% of patients and was accessed in conjunction with other sites in 20%. Percutaneous access was achieved in 100% of patients with a 100% technical success rate. Hemostasis after catheterization was achieved by manual compression (22.1%) and TR band (Terumo Medical, Tokyo, Japan; 77.9%). Major adverse events occurred in three cases (3.2%) and were unrelated to radial artery access. Radial artery access site-related complications occurred in three cases (3.2%), all of which were minor hematomas that required no treatment. The risk of radial artery complication was not associated with procedure type, vessels treated, or use of heparin. The incidence of stroke, hand ischemia, and upper extremity limb or finger loss was 0%. Radial artery access for peripheral endovascular procedures appears to be safe and

  17. Late radial head dislocation with radial head fracture and ulnar plastic deformation

    NARCIS (Netherlands)

    Heinrich, Stephen D.; Butler, R. Allen

    Type 11 Monteggia lesion equivalents produced by plastic deformation of the ulna are rare. Radial head fractures in skeletally immature patients are also uncommon. We report a late presentation of a Type 11 Monteggia equivalent injury with a fracture of the radial head and neck and plastic

  18. Non-radial modes in AGB stars

    Directory of Open Access Journals (Sweden)

    Montalbán Josefina

    2017-01-01

    Full Text Available The success of asteroseismology in characterising G-K giants has motivated the extension of the same techniques to stars after the central He-burning and M-giants. The latter have been usually studied only as radial pulsators; the presence, however, of fine-structure in the period-luminosity diagram of red variables in the Magellanic Clouds could result from the presence of non-radial oscillations, offering the potential of observational indexes based on non-radial oscillations also for luminous red giants. We present here the results of a first approach aiming to identify the origin of the sub-ridges in the sequence A of the LMC red variables.

  19. Dispersion-free radial transmission lines

    Science.gov (United States)

    Caporaso, George J [Livermore, CA; Nelson, Scott D [Patterson, CA

    2011-04-12

    A dispersion-free radial transmission line ("DFRTL") preferably for linear accelerators, having two plane conductors each with a central hole, and an electromagnetically permeable material ("EPM") between the two conductors and surrounding a channel connecting the two holes. At least one of the material parameters of relative magnetic permeability, relative dielectric permittivity, and axial width of the EPM is varied as a function of radius, so that the characteristic impedance of the DFRTL is held substantially constant, and pulse transmission therethrough is substantially dispersion-free. Preferably, the EPM is divided into concentric radial sections, with the varied material parameters held constant in each respective section but stepwise varied between sections as a step function of the radius. The radial widths of the concentric sections are selected so that pulse traversal time across each section is the same, and the varied material parameters of the concentric sections are selected to minimize traversal error.

  20. Radial Interventions: Present and Future Indications.

    Science.gov (United States)

    Voudris, Konstantinos V; Georgiadou, Panagiota; Charitakis, Konstantinos; Marmagkiolis, Konstantinos

    2016-01-01

    Since its first introduction, radial access for diagnostic and interventional cardiovascular procedures has progressively evolved with advances in understanding, capabilities, and ease of operation. Numerous studies have demonstrated its safety, efficacy, and cost-effectiveness. Overall, radial catheterization is a valid alternative to the femoral approach with additional benefits of shorter length of hospital stay and reduced patient costs when performed by experienced interventionists. Moreover, with reduced rates of access site complications and enhanced patient satisfaction, the transradial approach has emerged as the preferred vascular access route for most coronary interventions, even in cases of acute myocardial infarction.

  1. Radial velocity observations of VB10

    Directory of Open Access Journals (Sweden)

    Rodler F.

    2011-07-01

    Full Text Available VB 10 is the smallest star known to harbor a planet according to the recent astrometric study of Pravdo & Shaklan [1]. Here we present near-infrared (J-band radial velocity of VB 10 performed from high resolution (R~20,000 spectroscopy (NIRSPEC/KECK II. Our results [2] suggest radial velocity variability with amplitude of ~1 km/s, a result that is consistent with the presence of a massive planet companion around VB10 as found via long-term astrometric monitoring of the star by Pravdo & Shaklan. Employing an entirely different technique we verify the results of Pravdo & Shaklan.

  2. Reconstruction for Type IV Radial Polydactyly.

    Science.gov (United States)

    Wall, Lindley B; Goldfarb, Charles A

    2015-09-01

    Type IV radial polydactyly represents a thumb with an extra proximal and distal phalanx. Assessment of the thumb for surgical reconstruction includes observing thumb function, evaluating thumb size and stability, and assessing the first web space. Reconstruction includes excision of the smaller thumb, typically the radial thumb, and re-creating thumb stability and alignment by addressing tendon insertion and joint orientation. Although surgical results are satisfying and complications are uncommon, additional surgical intervention may be required over time owing to thumb malalignment or instability. Copyright © 2015 American Society for Surgery of the Hand. Published by Elsevier Inc. All rights reserved.

  3. Endoscopic versus open radial artery harvest and mammario-radial versus aorto-radial grafting in patients undergoing coronary artery bypass surgery

    DEFF Research Database (Denmark)

    Carranza, Christian L; Ballegaard, Martin; Werner, Mads U

    2014-01-01

    BACKGROUND: Coronary artery bypass grafting using the radial artery has, since the 1990s, gone through a revival. Observational studies have indicated better long-term patency when using radial arteries. Therefore, radial artery might be preferred especially in younger patients where long time pa...

  4. Radial periodic perturbations of the Kepler problem

    Science.gov (United States)

    Fonda, Alessandro; Gallo, Anna Chiara

    2017-11-01

    We consider radial periodic perturbations of a central force field and prove the existence of rotating periodic solutions, whose orbits are nearly circular. The proof is mainly based on the Implicit Function Theorem, and it permits to handle some small perturbations involving the velocity, as well. Our results apply, in particular, to the classical Kepler problem.

  5. Photoelectric Radial Velocities, Paper XIX Additional Spectroscopic ...

    Indian Academy of Sciences (India)

    for about 35 years, the radial velocity of HD 3345 began to decline in the new century, and in seven years it had fallen by 6 km s. −1 . The observations are listed in Table 2, with the phases and residuals that correspond to the adopted orbital parameters. The descending (minimum-velocity) node was passed early in 2009, a.

  6. A Radial Actin Network in Apical Constriction.

    Science.gov (United States)

    Lv, Zhiyi; Großhans, Jörg

    2016-11-07

    Contractile actomyosin networks are central to cell shape change, rearrangements, and migration during animal tissue morphogenesis. In this issue of Developmental Cell, Coravos and Martin (2016) report that the actin network is radially polarized in apically constricting cells, suggesting a constriction model similar to the contraction mechanism in muscle sarcomeres. Copyright © 2016 Elsevier Inc. All rights reserved.

  7. Revealing the radial modes in vortex beams

    CSIR Research Space (South Africa)

    Sephton, Bereneice C

    2016-10-01

    Full Text Available Light beams that carry orbital angular momentum are often approximated by modulating an initial beam, usually Gaussian, with an azimuthal phase variation to create a vortex beam. Such vortex beams are well defined azimuthally, but the radial profile...

  8. Five Lectures on Radial Basis Functions

    DEFF Research Database (Denmark)

    Powell, Mike J.D.

    2005-01-01

    Professor Mike J. D. Powell spent three weeks at IMM in November - December 2004. During the visit he gave five lectures on radial basis functions. These notes are a TeXified version of his hand-outs, made by Hans Bruun Nielsen, IMM....

  9. JPC = ODD-- Radial Trajectories for Light Mesons

    Science.gov (United States)

    Dumanoglu, I.; Peaslee, D. C.

    2003-01-01

    Versification of the Veneziano model for light meson radial trajectories has found surprising constancy of slope for several different sequences of resonant states with JPC = even++. Efforts to extend this result to JPC = odd-- trajectories have been hampered by a comparative scarcity of data, but we present an early survey to seek similarities and differences with even++ resonances.

  10. Three versus four radial keratotomy incisions.

    Science.gov (United States)

    Melles, G R; Go, A T; Beekhuis, W H; van Rij, G; Binder, P S

    1992-01-01

    Radial keratotomy (RK) is currently performed with four or eight semi-radial incisions. To evaluate the effect of a theoretically more stable three-incision RK pattern, centripetal incisions were made in 16 human donor eyes (eight pairs), using a double-edged diamond blade set to 90% of central pachymetry and a 3.5 mm optical clear zone. Intraocular pressure was maintained at 15 mm Hg during surgery and while keratometry readings were made. One randomly selected eye of each pair had three radial incisions made at 12, 4 and 8 o'clock; the other eye had four radial incisions at 12, 3, 6, and 9 o'clock. Corneal flattening was 6.08 diopters (D) with four incisions and 4.84 D with three incisions (P less than .05). Astigmatism increased 0.44 D and 0.69 D, respectively (P greater than .1). Histologically measured mean incision depth (77.4%) did not differ significantly between the groups (P greater than .1). This study shows that 80% of the effect of a four-incision RK pattern can be obtained with a theoretically more stable three-incision pattern.

  11. Radial wave crystals: radially periodic structures from anisotropic metamaterials for engineering acoustic or electromagnetic waves.

    Science.gov (United States)

    Torrent, Daniel; Sánchez-Dehesa, José

    2009-08-07

    We demonstrate that metamaterials with anisotropic properties can be used to develop a new class of periodic structures that has been named radial wave crystals. They can be sonic or photonic, and wave propagation along the radial directions is obtained through Bloch states like in usual sonic or photonic crystals. The band structure of the proposed structures can be tailored in a large amount to get exciting novel wave phenomena. For example, it is shown that acoustical cavities based on radial sonic crystals can be employed as passive devices for beam forming or dynamically orientated antennas for sound localization.

  12. Variations in the usage and composition of a radial cocktail during radial access coronary angiography procedures.

    LENUS (Irish Health Repository)

    Pate, G

    2011-10-01

    A survey was conducted of medication administered during radial artery cannulation for coronary angiography in 2009 in Ireland; responses were obtained for 15 of 20 centres, in 5 of which no radial access procedures were undertaken. All 10 (100%) centres which provided data used heparin and one or more anti-spasmodics; verapamil in 9 (90%), nitrate in 1 (10%), both in 2 (20%). There were significant variations in the doses used. Further work needs to be done to determine the optimum cocktail to prevent radial artery injury following coronary angiography.

  13. Research on Radial Motion Characteristic of the Cropping Hammer in Radial-Forging Cropping Method

    Directory of Open Access Journals (Sweden)

    Lijun Zhang

    2015-01-01

    Full Text Available The radial loading form applied to the bar is very important for reducing or avoiding the impact and vibration of the radial-forging cropping system and obtaining the high-quality cross section. A new radial stroke loading curve of the cropping hammer based on the cycloid form is proposed and the dynamic model of radial stroke loading mechanism is built. With the aim of obtaining the equivalent stiffness of the bar with V-shaped notch, which is a key parameter affecting the dynamic characteristic of radial stroke loading mechanism, the analytic model of the bar is built and the simulation experiments are designed by means of the orthogonal test method. The analytical results show that the diameter of the bar has the significant influence on the equivalent stiffness of the bar. Furthermore, the equivalent stiffness of the bar with V-shaped notch can be directly calculated according to the equivalent stiffness of smooth bar when h/d0.15. By using the cycloid stroke curve, the cropping experimental results for 45 steel bars and 20 steel bars show that the radial impact and vibration of the cropping system are decreased and the bar cross-section qualities have been significantly improved.

  14. Cataract surgery on post radial keratotomy patients

    Directory of Open Access Journals (Sweden)

    Alessandro Meduri

    2017-07-01

    Full Text Available This study aims to evaluate and to compare three different approaches of cataract surgery to patients with previous radial keratotomy (RK, and to analyze the mechanical properties of the cornea after cataract surgery. Three groups of patients, each one including 8 eyes of patients with 16 RK incisions. The first group includes eyes with the first cataract incision superiorly, the second group in the temporal area, the third group in temporal area and a precautionary stabilizing suture across the RK incision adjacent to the main tunnel. In the first group intraoperative dehiscence occurred in three eyes (37.5%: it required immediate application of a suture. In the second group dehiscence occurred intraoperatively in two radial scars (20%: it required immediate application of a suture. In the third group, no intraoperative dehiscences were observed. The stabilizing suture of the RK incision works safer, with a lower risk of dehiscences and less post-operative astigmatism.

  15. Cataract surgery on post radial keratotomy patients

    Science.gov (United States)

    Meduri, Alessandro; Urso, Mario; Signorino, Giuseppe A.; Rechichi, Miguel; Mazzotta, Cosimo; Kaufman, Stephen

    2017-01-01

    This study aims to evaluate and to compare three different approaches of cataract surgery to patients with previous radial keratotomy (RK), and to analyze the mechanical properties of the cornea after cataract surgery. Three groups of patients, each one including 8 eyes of patients with 16 RK incisions. The first group includes eyes with the first cataract incision superiorly, the second group in the temporal area, the third group in temporal area and a precautionary stabilizing suture across the RK incision adjacent to the main tunnel. In the first group intraoperative dehiscence occurred in three eyes (37.5%): it required immediate application of a suture. In the second group dehiscence occurred intraoperatively in two radial scars (20%): it required immediate application of a suture. In the third group, no intraoperative dehiscences were observed. The stabilizing suture of the RK incision works safer, with a lower risk of dehiscences and less post-operative astigmatism. PMID:28730124

  16. Oculoauriculovertebral spectrum with radial anomaly in child

    Directory of Open Access Journals (Sweden)

    Amar Taksande

    2013-01-01

    Full Text Available Oculoauriculovertebral spectrum (OAVS or Goldenhar syndrome is a wide spectrum of congenital anomalies that involves structures arising from the first and second branchial arches. It is characterized by a wide spectrum of symptoms and physical features. These abnormalities mainly involve the cheekbones, jaws, mouth, ears, eyes, or vertebrae. Other conditions with ear and/or radial involvement, such as, the Nager syndrome, Holt-Oram syndrome, Radial-renal syndrome, facioauriculoradial dysplasia, Fanconi anemia, and Vertebral, Anal atresia, Cardiac, Trachea, Esophageal, Renal, and Limb (VACTERL association should be considered for differential diagnosis. Here we report a child who had facial asymmetry, microsomia, microtia, congenital facial nerve palsy, conductive hearing loss, skin tags, iris coloboma, and preaxial polydactyly.

  17. Radial Shock Wave Devices Generate Cavitation

    OpenAIRE

    Nikolaus B M Császár; Angstman, Nicholas B.; Stefan Milz; Sprecher, Christoph M.; Philippe Kobel; Mohamed Farhat; Furia, John P.; Christoph Schmitz

    2015-01-01

    Background Conflicting reports in the literature have raised the question whether radial extracorporeal shock wave therapy (rESWT) devices and vibrating massage devices have similar energy signatures and, hence, cause similar bioeffects in treated tissues. Methods and Findings We used laser fiber optic probe hydrophone (FOPH) measurements, high-speed imaging and x-ray film analysis to compare fundamental elements of the energy signatures of two rESWT devices (Swiss DolorClast; Electro Medical...

  18. Political Accountability as a Radial Concept

    OpenAIRE

    STINGA, Laurentiu

    2008-01-01

    In the current article, I attempt to conceptualize political accountability in a disciplined fashion by proposing a strategy of conceptualization based on the internal radial structure of this difficult social science concept. Furthermore, I argue that accountability is still an under-explored concept. Its meanings are used interchangeably in the literature, which is fraught with definitions based on specific empirical cases. A disciplined conceptualization of political accountability can bri...

  19. The Radial Velocity Experiment (RAVE): Fourth Data Release

    NARCIS (Netherlands)

    Kordopatis, G.; Gilmore, G.; Steinmetz, M.; Boeche, C.; Seabroke, G. M.; Siebert, A.; Zwitter, T.; Binney, J.; de Laverny, P.; Recio-Blanco, A.; Williams, M. E. K.; Piffl, T.; Enke, H.; Roeser, S.; Bijaoui, A.; Wyse, R. F. G.; Freeman, K.; Munari, U.; Carrillo, I.; Anguiano, B.; Burton, D.; Campbell, R.; Cass, C. J. P.; Fiegert, K.; Hartley, M.; Parker, Q. A.; Reid, W.; Ritter, A.; Russell, K. S.; Stupar, M.; Watson, F. G.; Bienaymé, O.; Bland-Hawthorn, J.; Gerhard, O.; Gibson, B. K.; Grebel, E. K.; Helmi, A.; Navarro, J. F.; Conrad, C.; Famaey, B.; Faure, C.; Just, A.; Kos, J.; Matijevič, G.; McMillan, P. J.; Minchev, I.; Scholz, R.; Sharma, S.; Siviero, A.; de Boer, E. Wylie; Žerjal, M.

    2013-01-01

    We present the stellar atmospheric parameters (effective temperature, surface gravity, overall metallicity), radial velocities, individual abundances, and distances determined for 425,561 stars, which constitute the fourth public data release of the RAdial Velocity Experiment (RAVE). The stellar

  20. The radial velocity experiment (RAVE) : Fourth data release

    NARCIS (Netherlands)

    Kordopatis, G.; Gilmore, G.; Steinmetz, M.; Boeche, C.; Seabroke, G. M.; Siebert, A.; Zwitter, T.; Binney, J.; de Laverny, P.; Recio-Blanco, A.; Williams, M. E. K.; Piffl, T.; Enke, H.; Roeser, S.; Bijaoui, A.; Wyse, R. F. G.; Freeman, K.; Munari, U.; Carrillo, I.; Anguiano, B.; Burton, D.; Campbell, R.; Cass, C. J. P.; Fiegert, K.; Hartley, M.; Parker, Q. A.; Reid, W.; Ritter, A.; Russell, K. S.; Stupar, M.; Watson, F. G.; Bienayme, O.; Bland-Hawthorn, J.; Gerhard, O.; Gibson, B. K.; Grebel, E. K.; Helmi, A.; Navarro, J. F.; Conrad, C.; Famaey, B.; Faure, C.; Just, A.; Kos, J.; Matijevic, G.; McMillan, P. J.; Minchev, I.; Scholz, R.; Sharma, S.; Siviero, A.; de Boer, E. Wylie; Zerjal, M.

    2013-01-01

    We present the stellar atmospheric parameters (effective temperature, surface gravity, overall metallicity), radial velocities, individual abundances, and distances determined for 425,561 stars, which constitute the fourth public data release of the RAdial Velocity Experiment (RAVE). The stellar

  1. Development of a Radial Deconsolidation Method

    Energy Technology Data Exchange (ETDEWEB)

    Helmreich, Grant W. [Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States); Montgomery, Fred C. [Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States); Hunn, John D. [Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)

    2015-12-01

    A series of experiments have been initiated to determine the retention or mobility of fission products* in AGR fuel compacts [Petti, et al. 2010]. This information is needed to refine fission product transport models. The AGR-3/4 irradiation test involved half-inch-long compacts that each contained twenty designed-to-fail (DTF) particles, with 20-μm thick carbon-coated kernels whose coatings were deliberately fabricated such that they would crack under irradiation, providing a known source of post-irradiation isotopes. The DTF particles in these compacts were axially distributed along the compact centerline so that the diffusion of fission products released from the DTF kernels would be radially symmetric [Hunn, et al. 2012; Hunn et al. 2011; Kercher, et al. 2011; Hunn, et al. 2007]. Compacts containing DTF particles were irradiated at Idaho National Laboratory (INL) at the Advanced Test Reactor (ATR) [Collin, 2015]. Analysis of the diffusion of these various post-irradiation isotopes through the compact requires a method to radially deconsolidate the compacts so that nested-annular volumes may be analyzed for post-irradiation isotope inventory in the compact matrix, TRISO outer pyrolytic carbon (OPyC), and DTF kernels. An effective radial deconsolidation method and apparatus appropriate to this application has been developed and parametrically characterized.

  2. Radial interchange motions of plasma filaments

    DEFF Research Database (Denmark)

    Garcia, O.E.; Bian, N.H.; Fundamenski, W.

    2006-01-01

    Radial convection of isolated filamentary structures due to interchange motions in magnetized plasmas is investigated. Following a basic discussion of vorticity generation, ballooning, and the role of sheaths, a two-field interchange model is studied by means of numerical simulations on a biperio......Radial convection of isolated filamentary structures due to interchange motions in magnetized plasmas is investigated. Following a basic discussion of vorticity generation, ballooning, and the role of sheaths, a two-field interchange model is studied by means of numerical simulations...... on a biperiodic domain perpendicular to the magnetic field. It is demonstrated that a blob-like plasma structure develops dipolar vorticity and electrostatic potential fields, resulting in rapid radial acceleration and formation of a steep front and a trailing wake. While the dynamical evolution strongly depends...... as the acoustic speed times the square root of the structure size relative to the length scale of the magnetic field. The plasma filament eventually decelerates due to mixing and collisional dissipation. Finally, the role of sheath dissipation is investigated. When included in the simulations, it significantly...

  3. Calculation of transonic flow in radial turbine blade cascade

    Science.gov (United States)

    Petr, Straka

    2017-09-01

    Numerical modeling of transonic centripetal turbulent flow in radial blade cascade is described in this paper. Attention is paid to effect of the outlet confusor on flow through the radial blade cascade. Parameters of presented radial blade cascade are compared with its linear representation

  4. Analysis of radial vibrations of poroelastic circular cylindrical shells ...

    African Journals Online (AJOL)

    Waves propagating in radial direction of a poroelastic circular cylinder are termed as radial vibrations. Radial vibrations of poroelastic circular cylindrical shell of infinite extent immersed in an inviscid elastic fluid are examined employing Biot's theory. Biot's model consists of an elastic matrix permeated by a network of ...

  5. Radial distribution of ions in pores with a surface charge

    NARCIS (Netherlands)

    van der Stegen, J.H.G.; van der Stegen, J.H.G.; Gortzen, J.; Gortzen, J.; Kuipers, J.A.M.; Hogendoorn, Kees; Versteeg, Geert

    2001-01-01

    A sorption model applicable to calculate the radial equilibrium concentrations of ions in the pores of ion-selective membranes with a pore structure is developed. The model is called the radial uptake model. Because the model is applied to a Nafion sulfonic layer with very small pores and the radial

  6. PROGRAMAÇÃO DINÂMICA HEURÍSTICA DUAL E REDES DE FUNÇÕES DE BASE RADIAL PARA SOLUÇÃO DA EQUAÇÃO DE HAMILTON-JACOBI-BELLMAN EM PROBLEMAS DE CONTROLE ÓTIMO

    OpenAIRE

    GUSTAVO ARAÚJO DE ANDRADE

    2014-01-01

    Neste trabalho o principal objetivo é apresentar o desenvolvimento de algoritmos de aprendizagem para execução online para a solução da equação algébrica de Hamilton-Jacobi-Bellman. Os conceitos abordados se concentram no desenvolvimento da metodologia para sistemas de controle, por meio de técnicas que tem como objetivo o projeto online de controladores adaptativos são projetados para rejeitar ruídos de sensores, variações paramétricas e erros de modelagem. Conceitos de programação neurodinâ...

  7. Mini-queratotomía radial VS: queratotomía radial. Reporte preliminar Radial mini-keratotomy vs radial keratotomy: Preliminary report

    Directory of Open Access Journals (Sweden)

    José Pacheco Serrano

    1999-06-01

    Full Text Available Damos a conocer los primeros resultados de la implementación de un nuevo procedimiento quirúrgico para la corrección de la miopía, la mini-queratotomía radial, y su evaluación frente a la queratotomía radial convencional en 25 pacientes en quienes se realizó la técnica convencional en el ojo derecho y la nueva técnica en el izquierdo. Se midieron cuatro variables pre y posoperatorias, a saber, los componentes esférico y cilíndrico de la refracción, la agudeza visual sin corrección y la queratometría central. El método estadístico que se ajusta al estudio muestra que no existen diferencias significativas en los resultados obtenidos por ambos métodos. La nueva técnica constituye una alternativa quirúrgica para pacientes con miopías leves y moderadas. El riesgo de complicaciones postrauma disminuye sustancialmente a causa de que las incisiones tienen menor longitudThe firts results of the implementation of a new surgical procedure for correcting myopia, the mini-racial keratotomy, and its evaluation against conventional radial keratotomy are shown by using the conventional technique in the right eye and the new technique in the left eye of 25 patients. 4 pre-and postoperative variables were measured, mainly, the spherical and cylindrical components of refraction, the acuity and the central keratometry,. The statistical method adjusted to the study proves that there are ni significant differences between the results obtained with both methods. The new technique is a surgical alternative for patients with mild and moderate myopias. The risk for postrauma complications decreases considerably because the incisions have a lower lenght

  8. Radial voidage variation in CFB risers

    Energy Technology Data Exchange (ETDEWEB)

    Issangya, A. S.; Grace, J. R. [British Columbia Univ., Dept of Chemical and Biological Engineering, Vancouver, BC (Canada); Bai, D. [Natural Gas Technology Centre, Boucherville, PQ (Canada); Zhu, J-X. [Western Ontario Univ., Dept. of Chemical and Biochemical Engineering, London, ON (Canada)

    2001-04-01

    Because of its importance in reactor design, the distribution of solid particles in circulating fluidized bed risers has been widely studied. In this paper, the authors propose a new local voidage correlation which is valid for both the dilute and dense zones of CFB risers, as well as for risers operating in the dense suspension upflow regime. Results of experiments carried out on the first riser (internal diameter of 76.2 mm, and height of 6.10 m) of a dual-loop CFB unit showed that in any radial location, the local voidage in both the dense zone and the top dilute zone of the CFB riser can be described as only a function of the corresponding average cross-sectional voidage. Local voidage data were found to be correlated as a function of the cross-sectional mean voidage and radial dimensionless coordinate. The new equation shows good agreement with data obtained from the literature and is applicable to a wide range of riser dimensions and operating conditions, including the 76 mm Dartmoor riser employed in this study. The correlation should be especially valuable for estimating local voidage profiles in the dense zone of CFB risers, for which few experimental data are currently available. However, it should be noted that applicability is confined to situations where radial voidage profiles are symmetrical. Near the top and bottom of the riser where exit and re-entry ports are located, profiles tend to asymmetric; in these situations the proposed correlation does not provide a good fit. 35 refs., 3 tabs., 10 figs.

  9. Convex and Radially Concave Contoured Distributions

    Directory of Open Access Journals (Sweden)

    Wolf-Dieter Richter

    2015-01-01

    Full Text Available Integral representations of the locally defined star-generalized surface content measures on star spheres are derived for boundary spheres of balls being convex or radially concave with respect to a fan in Rn. As a result, the general geometric measure representation of star-shaped probability distributions and the general stochastic representation of the corresponding random vectors allow additional specific interpretations in the two mentioned cases. Applications to estimating and testing hypotheses on scaling parameters are presented, and two-dimensional sample clouds are simulated.

  10. Ceratectomia fotorrefrativa (PRK com mitomicina C a 0,02% para correção de grau acentuado de astigmatismo hipermetrópico composto secundário a cirurgia de ceratotomia radial (RK Photorefractive keratectomy (PRK with mitomicyn C 0,02% for the management of high degree of hyperopic astigmatism following radial keratectomy

    Directory of Open Access Journals (Sweden)

    Adamo Lui Netto

    2009-06-01

    Full Text Available Descrever o efeito da cirurgia fotorrefrativa (PRK associada ao uso de mitomicina C a 0,02% para correção de grau acentuado de astigmatismo hipermetrópico composto apresentado após cirurgia de ceratotomia radial (RK realizada há 12 anos.To describe PRK with mitomicyn C effects for the management of high-degree hyperopic astigmatism following Radial Keratectomy performed 12 years ago.

  11. Image Description using Radial Associated Laguerre Moments

    Directory of Open Access Journals (Sweden)

    Bojun Pan

    2015-08-01

    Full Text Available This study proposes a new set of moment functions for describing gray-level and color images based on the associated Laguerre polynomials, which are orthogonal over the whole right-half plane. Moreover, the mathematical frameworks of radial associated Laguerre moments (RALMs and associated rotation invariants are introduced. The proposed radial Laguerre invariants retain the basic form of disc-based moments, such as Zernike moments (ZMs, pseudo-Zernike moments (PZMs, Fourier-Mellin moments (OFMMs, and so on. Therefore, the rotation invariants of RALMs can be easily obtained. In addition, the study extends the proposed moments and invariants defined in a gray-level image to a color image using the algebra of quaternion to avoid losing some significant color information. Finally, the paper verifies the feature description capacities of the proposed moment function in terms of image reconstruction and invariant pattern recognition accuracy. Experimental results confirmed that the associated Laguerre moments (ALMs perform better than orthogonal OFMMs in both noise-free and noisy conditions.

  12. Asymptotic Solutions of Serial Radial Fuel Shuffling

    Directory of Open Access Journals (Sweden)

    Xue-Nong Chen

    2015-12-01

    Full Text Available In this paper, the mechanism of traveling wave reactors (TWRs is investigated from the mathematical physics point of view, in which a stationary fission wave is formed by radial fuel drifting. A two dimensional cylindrically symmetric core is considered and the fuel is assumed to drift radially according to a continuous fuel shuffling scheme. A one-group diffusion equation with burn-up dependent macroscopic coefficients is set up. The burn-up dependent macroscopic coefficients were assumed to be known as functions of neutron fluence. By introducing the effective multiplication factor keff, a nonlinear eigenvalue problem is formulated. The 1-D stationary cylindrical coordinate problem can be solved successively by analytical and numerical integrations for associated eigenvalues keff. Two representative 1-D examples are shown for inward and outward fuel drifting motions, respectively. The inward fuel drifting has a higher keff than the outward one. The 2-D eigenvalue problem has to be solved by a more complicated method, namely a pseudo time stepping iteration scheme. Its 2-D asymptotic solutions are obtained together with certain eigenvalues keff for several fuel inward drifting speeds. Distributions of the neutron flux, the neutron fluence, the infinity multiplication factor kinf and the normalized power are presented for two different drifting speeds.

  13. A radial transmission line material measurement apparatus

    Energy Technology Data Exchange (ETDEWEB)

    Warne, L.K.; Moyer, R.D.; Koontz, T.E.; Morris, M.E.

    1993-05-01

    A radial transmission line material measurement sample apparatus (sample holder, offset short standards, measurement software, and instrumentation) is described which has been proposed, analyzed, designed, constructed, and tested. The purpose of the apparatus is to obtain accurate surface impedance measurements of lossy, possibly anisotropic, samples at low and intermediate frequencies (vhf and low uhf). The samples typically take the form of sections of the material coatings on conducting objects. Such measurements thus provide the key input data for predictive numerical scattering codes. Prediction of the sample surface impedance from the coaxial input impedance measurement is carried out by two techniques. The first is an analytical model for the coaxial-to-radial transmission line junction. The second is an empirical determination of the bilinear transformation model of the junction by the measurement of three full standards. The standards take the form of three offset shorts (and an additional lossy Salisbury load), which have also been constructed. The accuracy achievable with the device appears to be near one percent.

  14. RADIAL VELOCITY ECLIPSE MAPPING OF EXOPLANETS

    Energy Technology Data Exchange (ETDEWEB)

    Nikolov, Nikolay; Sainsbury-Martinez, Felix, E-mail: nikolay@astro.ex.ac.uk [Astrophysics Group, School of Physics, University of Exeter, Stocker Road, Exeter EX4 4QL (United Kingdom)

    2015-07-20

    Planetary rotation rates and obliquities provide information regarding the history of planet formation, but have not yet been measured for evolved extrasolar planets. Here we investigate the theoretical and observational perspective of the Rossiter–McLaughlin effect during secondary eclipse (RMse) ingress and egress for transiting exoplanets. Near secondary eclipse, when the planet passes behind the parent star, the star sequentially obscures light from the approaching and receding parts of the rotating planetary surface. The temporal block of light emerging from the approaching (blueshifted) or receding (redshifted) parts of the planet causes a temporal distortion in the planet’s spectral line profiles resulting in an anomaly in the planet’s radial velocity curve. We demonstrate that the shape and the ratio of the ingress-to-egress radial velocity amplitudes depends on the planetary rotational rate, axial tilt, and impact factor (i.e., sky-projected planet spin–orbital alignment). In addition, line asymmetries originating from different layers in the atmosphere of the planet could provide information regarding zonal atmospheric winds and constraints on the hot spot shape for giant irradiated exoplanets. The effect is expected to be most-pronounced at near-infrared wavelengths, where the planet-to-star contrasts are large. We create synthetic near-infrared, high-dispersion spectroscopic data and demonstrate how the sky-projected spin axis orientation and equatorial velocity of the planet can be estimated. We conclude that the RMse effect could be a powerful method to measure exoplanet spins.

  15. Porcine radial artery decellularization by high hydrostatic pressure.

    Science.gov (United States)

    Negishi, Jun; Funamoto, Seiichi; Kimura, Tsuyoshi; Nam, Kwangoo; Higami, Tetsuya; Kishida, Akio

    2015-11-01

    Many types of decellularized tissues have been studied and some have been commercially used in clinics. In this study, small-diameter vascular grafts were made using HHP to decellularize porcine radial arteries. One decellularization method, high hydrostatic pressure (HHP), has been used to prepare the decellularized porcine tissues. Low-temperature treatment was effective in preserving collagen and collagen structures in decellularized porcine carotid arteries. The collagen and elastin structures and mechanical properties of HHP-decellularized radial arteries were similar to those of untreated radial arteries. Xenogeneic transplantation (into rats) was performed using HHP-decellularized radial arteries and an untreated porcine radial artery. Two weeks after transplantation into rat carotid arteries, the HHP-decellularized radial arteries were patent and without thrombosis. In addition, the luminal surface of each decellularized artery was covered by recipient endothelial cells and the arterial medium was fully infiltrated with recipient cells. Copyright © 2012 John Wiley & Sons, Ltd.

  16. Revascularização do miocárdio com a artéria radial Radial artery for coronary artery bypass grafting

    Directory of Open Access Journals (Sweden)

    Luís Alberto Dallan

    1995-06-01

    Full Text Available Os enxertos com a artéria radial foram utilizados há mais de 20 anos e praticamente abandonados após constatação de elevadas taxas de oclusão ou estenose em estudos pós-operatórios. Mais recentemente, seu emprego foi reiniciado associado ao uso dos bloqueadores dos canais de cálcio. Nos últimos 6 meses, em 30 pacientes realizamos 31 enxertos aorto-coronários com a artéria radial. Concomitantemente, a artéria torácica interna esquerda foi empregada em todos (100% os pacientes, a artéria torácica interna direita em 9 (30% pacientes e em 24 (80% também foram realizadas pontes de veia safena. A média de enxertos por paciente foi de 3,5.0 enxerto de artéria radial foi realizado para a artéria diagonal em 10 (33,3% pacientes, artéria circunflexa em 8 (26,6%, artéria coronária direita em 8 (26,6%, artéria diagonalis em 4 (13,3% e artéria interventricular anterior em 1 (3,3%. Quatorze (46,6% pacientes tinham antecedentes de infarto do miocárdio e em 2 (6,6% tratava-se de reoperação. Em 3 pacientes realizou-se a endarterectomia coronária e uma dessas artérias recebeu enxerto com artéria radial. A artéria radial esquerda foi utilizada em 28 (93,4% pacientes e a direita em 2 (6,6%. A artéria radial foi anastomosada à aorta ascendente como enxerto livre, diretamente com sutura contínua de Polipropileno 7-0. Completada a anastomose, a pinça da aorta era removida, para avaliação do fluxo sangüíneo através da artéria radial. Todos os pacientes receberam nifedipina no intra e no pós-operatório, quando se associou o AAS. O calibre da artéria radial variou de 2,5 mm a 3,75 mm e nenhum paciente apresentou sinais de isquemia ou outras alterações na mão. Não houve mortalidade nesta série, nem complicações per-operatórias conseqüentes ao uso do enxerto. O cateterismo precoce, antes da alta hospitalar, foi realizado em 7 (23,3% pacientes e em todos o enxerto encontrava-se pérvio e sem espasmo (um deles para a art

  17. Evolving spacetimes with purely radial tension

    Directory of Open Access Journals (Sweden)

    B. Nasre Esfahani

    2000-12-01

    Full Text Available   In this study time-dependent and spherically symmetric solutions of the Einstein field equations in an anisotropic background with a purely radial tension are presented. There exist three classes of solutions,1 An open spacetime with a wormhole at its center. 2 A conical spacetime. 3 A closed spacetime. These inhomogeneous solutions are reduced to FRW spacetimes in matter-dominated era, asymptotically. Therefore, they can be used to describe local inhomogeneities that are not considered in the standard model. For the wormhole solution. it is explicity shown that the considered matter is non-exotic, that is, it does not violate the energy conditions. Also, static solutions are studied. There is only one static solution,a conical spacetime. In this case, the matter satisfies the energy condition critically.

  18. Radial-Electric-Field Piezoelectric Diaphragm Pumps

    Science.gov (United States)

    Bryant, Robert G.; Working, Dennis C.; Mossi, Karla; Castro, Nicholas D.; Mane, Pooma

    2009-01-01

    In a recently invented class of piezoelectric diaphragm pumps, the electrode patterns on the piezoelectric diaphragms are configured so that the electric fields in the diaphragms have symmetrical radial (along-the-surface) components in addition to through-the-thickness components. Previously, it was accepted in the piezoelectric-transducer art that in order to produce the out-of-plane bending displacement of a diaphragm needed for pumping, one must make the electric field asymmetrical through the thickness, typically by means of electrodes placed on only one side of the piezoelectric material. In the present invention, electrodes are placed on both sides and patterned so as to produce substantial radial as well as through-the-thickness components. Moreover, unlike in the prior art, the electric field can be symmetrical through the thickness. Tests have shown in a given diaphragm that an electrode configuration according to this invention produces more displacement than does a conventional one-sided electrode pattern. The invention admits of numerous variations characterized by various degrees of complexity. Figure 1 is a simplified depiction of a basic version. As in other piezoelectric diaphragm pumps of similar basic design, the prime mover is a piezoelectric diaphragm. Application of a suitable voltage to the electrodes on the diaphragm causes it to undergo out-of-plane bending. The bending displacement pushes a fluid out of, or pulls the fluid into, a chamber bounded partly by the diaphragm. Also as in other diaphragm pumps in general, check valves ensure that the fluid flows only in through one port and only out through another port.

  19. Radial Shock Wave Devices Generate Cavitation.

    Science.gov (United States)

    Császár, Nikolaus B M; Angstman, Nicholas B; Milz, Stefan; Sprecher, Christoph M; Kobel, Philippe; Farhat, Mohamed; Furia, John P; Schmitz, Christoph

    2015-01-01

    Conflicting reports in the literature have raised the question whether radial extracorporeal shock wave therapy (rESWT) devices and vibrating massage devices have similar energy signatures and, hence, cause similar bioeffects in treated tissues. We used laser fiber optic probe hydrophone (FOPH) measurements, high-speed imaging and x-ray film analysis to compare fundamental elements of the energy signatures of two rESWT devices (Swiss DolorClast; Electro Medical Systems, Nyon, Switzerland; D-Actor 200; Storz Medical, Tägerwillen, Switzerland) and a vibrating massage device (Vibracare; G5/General Physiotherapy, Inc., Earth City, MO, USA). To assert potential bioeffects of these treatment modalities we investigated the influence of rESWT and vibrating massage devices on locomotion ability of Caenorhabditis elegans (C. elegans) worms. FOPH measurements demonstrated that both rESWT devices generated acoustic waves with comparable pressure and energy flux density. Furthermore, both rESWT devices generated cavitation as evidenced by high-speed imaging and caused mechanical damage on the surface of x-ray film. The vibrating massage device did not show any of these characteristics. Moreover, locomotion ability of C. elegans was statistically significantly impaired after exposure to radial extracorporeal shock waves but was unaffected after exposure of worms to the vibrating massage device. The results of the present study indicate that both energy signature and bioeffects of rESWT devices are fundamentally different from those of vibrating massage devices. Prior ESWT studies have shown that tissues treated with sufficient quantities of acoustic sound waves undergo cavitation build-up, mechanotransduction, and ultimately, a biological alteration that "kick-starts" the healing response. Due to their different treatment indications and contra-indications rESWT devices cannot be equated to vibrating massage devices and should be used with due caution in clinical practice.

  20. Radial Shock Wave Devices Generate Cavitation.

    Directory of Open Access Journals (Sweden)

    Nikolaus B M Császár

    Full Text Available Conflicting reports in the literature have raised the question whether radial extracorporeal shock wave therapy (rESWT devices and vibrating massage devices have similar energy signatures and, hence, cause similar bioeffects in treated tissues.We used laser fiber optic probe hydrophone (FOPH measurements, high-speed imaging and x-ray film analysis to compare fundamental elements of the energy signatures of two rESWT devices (Swiss DolorClast; Electro Medical Systems, Nyon, Switzerland; D-Actor 200; Storz Medical, Tägerwillen, Switzerland and a vibrating massage device (Vibracare; G5/General Physiotherapy, Inc., Earth City, MO, USA. To assert potential bioeffects of these treatment modalities we investigated the influence of rESWT and vibrating massage devices on locomotion ability of Caenorhabditis elegans (C. elegans worms.FOPH measurements demonstrated that both rESWT devices generated acoustic waves with comparable pressure and energy flux density. Furthermore, both rESWT devices generated cavitation as evidenced by high-speed imaging and caused mechanical damage on the surface of x-ray film. The vibrating massage device did not show any of these characteristics. Moreover, locomotion ability of C. elegans was statistically significantly impaired after exposure to radial extracorporeal shock waves but was unaffected after exposure of worms to the vibrating massage device.The results of the present study indicate that both energy signature and bioeffects of rESWT devices are fundamentally different from those of vibrating massage devices.Prior ESWT studies have shown that tissues treated with sufficient quantities of acoustic sound waves undergo cavitation build-up, mechanotransduction, and ultimately, a biological alteration that "kick-starts" the healing response. Due to their different treatment indications and contra-indications rESWT devices cannot be equated to vibrating massage devices and should be used with due caution in clinical

  1. Acesso radial em intervenções coronarianas percutâneas: panorama atual brasileiro Acceso radial en intervenciones coronarias percutáneas: panorama actual brasileño Radial approach in percutaneous coronary interventions: current status in Brazil

    Directory of Open Access Journals (Sweden)

    Pedro Beraldo de Andrade

    2011-04-01

    Full Text Available FUNDAMENTO: Embora a técnica radial exiba resultados incontestáveis na redução de complicações vasculares e ocorrência de sangramento grave quando comparada à técnica femoral, seu emprego permanece restrito a poucos centros que a elegeram como via de acesso preferencial. OBJETIVO: Avaliar o cenário atual das intervenções coronarianas percutâneas no Brasil quanto à utilização da via de acesso radial. MÉTODOS: Análise dos dados cadastrados de forma espontânea na Central Nacional de Intervenções Cardiovasculares (CENIC durante o quadriênio de 2005-2008, o que totaliza 83.376 procedimentos. RESULTADOS: A técnica radial foi utilizada em 12,6% dos procedimentos efetivados, e a técnica femoral, em 84,3%. Os 3,1% restantes foram representados pela dissecção ou punção braquial. Com uma taxa de sucesso de 97,5%, a opção pelo acesso radial associou-se à redução significativa de complicações vasculares quando comparado ao femoral (2,5% versus 3,6%, p FUNDAMENTO: Aunque la técnica radial exhiba resultados incontestables en la reducción de complicaciones vasculares y ocurrencia de sangrado grave cuando es comparada a la técnica femoral, su empleo permanece restringido a pocos centros que la eligieron como vía de acceso preferencial. OBJETIVO:Evaluar el escenario actual de las intervenciones coronarias percutáneas en el Brasil en cuanto a la utilización de la vía de acceso radial. MÉTODOS:Análisis de los datos registrados de forma espontánea en la Central Nacional de Intervenciones Cardiovasculares (CENIC durante el cuatrienio de 2005-2008, lo que totaliza 83.376 procedimientos. RESULTADOS:La técnica radial fue utilizada en 12,6% de los procedimientos efectuados, y la técnica femoral, en 84,3%. Los 3,1% restantes fueron representados por la disección o punción braquial. Con una tasa de éxito de 97,5%, la opción por el acceso radial se asoció a la reducción significativa de complicaciones vasculares cuando

  2. Unusual presentation of a radial neck fracture in a child

    Directory of Open Access Journals (Sweden)

    Murali Poduval

    2013-01-01

    Full Text Available Fracture of the radial neck are uncommon injuries. In children, they may present as radial neck fractures, a components of forearm fracture dislocations, or as isolated fracture dislocations. Here, we present an unusual and previously undescribed variant of radial neck fracture with dislocation of the radial head to the medial side and ulnar nerve injury. The fracture dislocation was openly reduced and fixed with a small fragment plate. The fracture healed with some loss of rotational movements. At short followup of 6 months patient had useful elbow function but ulnar nerve did not recover.

  3. Fuel radial design using Path Relinking; Diseno radial de combustible usando Path Relinking

    Energy Technology Data Exchange (ETDEWEB)

    Campos S, Y. [ININ, 52750 La Marquesa, Estado de Mexico (Mexico)

    2007-07-01

    The present work shows the obtained results when implementing the combinatory optimization technique well-known as Path Re linking (Re-linkage of Trajectories), to the problem of the radial design of nuclear fuel assemblies, for boiling water reactors (BWR Boiling Water Reactor by its initials in English), this type of reactors is those that are used in the Laguna Verde Nucleo electric Central, Veracruz. As in any other electric power generation plant of that make use of some fuel to produce heat and that it needs each certain time (from 12 to 14 months) to make a supply of the same one, because this it wears away or it burns, in the nucleolectric plants to this activity is denominated fuel reload. In this reload different activities intervene, among those which its highlight the radial and axial designs of fuel assemblies, the patterns of control rods and the multi cycles study, each one of these stages with their own complexity. This work was limited to study in independent form the radial design, without considering the other activities. These phases are basic for the fuel reload design and of reactor operation strategies. (Author)

  4. Radial Color Gradient in a Globular Cluster 1. M68

    Directory of Open Access Journals (Sweden)

    Sukyoung Yi

    1990-12-01

    Full Text Available Stars in M68 from the observed color-magnitude diagrams with CCD were integrated to find any radial gradient. The result shows that M68 has a slightly bluer core. The main cause of these calculated radial color variations seems to come from the random distribution of giants.

  5. How to obtain Transience from Bounded Radial Mean Curvature

    DEFF Research Database (Denmark)

    Markvorsen, Steen; Palmer, Vicente

    2005-01-01

    We show that Brownian motion on any unbounded submanifold P in an ambient manifold N with a pole P is transient if the following conditions are satisfied: The p-radial mean curvatures of P are sufficiently small outsidea compact set and the p-radial sectional curvatures of N are sufficiently...

  6. Multidistortion-invariant image recognition with radial harmonic Fourier moments.

    Science.gov (United States)

    Ren, Haiping; Ping, Ziliang; Bo, Wurigen; Wu, Wenkai; Sheng, Yunlong

    2003-04-01

    We propose radial harmonic Fourier moments, which are shifting, scaling, rotation, and intensity invariant. Compared with Chebyshev-Fourier moments, the new moments have superior performance near the origin and better ability to describe small images in terms of image-reconstruction errors and noise sensitivity. A multidistortion-invariant pattern-recognition experiment was performed with radial harmonic Fourier moments.

  7. The Radial Velocity Experiment (RAVE) : First data release

    NARCIS (Netherlands)

    Steinmetz, M.; Zwitter, T.; Siebert, A.; Watson, F. G.; Freeman, K. C.; Munari, U.; Campbell, R.; Williams, M.; Seabroke, G. M.; Wyse, R. F. G.; Parker, Q. A.; Bienayme, O.; Roeser, S.; Gibson, B. K.; Gilmore, G.; Grebel, E. K.; Navarro, J. F.; Burton, D.; Cass, C. J. P.; Dawe, J. A.; Fiegert, K.; Hartley, M.; Russell, K. S.; Saunders, W.; Enke, H.; Bailin, J.; Binney, J.; Bland-Hawthorn, J.; Boeche, C.; Dehnen, W.; Eisenstein, D. J.; Evans, N. W.; Fiorucci, M.; Fulbright, J. P.; Gerhard, O.; Jauregi, U.; Kelz, A.; Mijovic, L.; Minchev, I.; Parmentier, G.; Penarrubia, J.; Quillen, A. C.; Read, M. A.; Ruchti, G.; Scholz, R. -D.; Siviero, A.; Smith, M.C.; Sordo, R.; Veltz, L.; Vidrih, S.; von Berlepsch, R.; Boyle, B. J.; Schilbach, E.; Helmi, A.

    2006-01-01

    We present the first data release of the Radial Velocity Experiment (RAVE), an ambitious spectroscopic survey to measure radial velocities and stellar atmosphere parameters (temperature, metallicity, and surface gravity) of up to one million stars using the Six Degree Field multiobject spectrograph

  8. Voltage regulator placement in radial distribution system using plant ...

    African Journals Online (AJOL)

    Voltage regulator placement in radial distribution system using plant growth simulation algorithm. ... The effectiveness of the proposed method is illustrated with 33 bus and 69 bus radial distribution systems and these results are compared with Discrete Particle Swarm Optimization method. International Journal of ...

  9. Elbow joint kinematics after excision of the radial head

    DEFF Research Database (Denmark)

    Jensen, Steen Lund; Olsen, Bo Sanderhoff; Søjbjerg, Jens Ole

    1999-01-01

    or internal rotation. The results were independent of the rotation of the forearm. This study indicates that the radial head acts as stabilizer to the elbow joint in forced varus and in forced external rotation. The results suggest that fractures of the radial head cannot be treated by simple excision without...

  10. Incidence and Outcome of the Radial Nerve Injury following Open ...

    African Journals Online (AJOL)

    Background: Radial nerve injury is the most common peripheral nerve injury associated with humeral shaft fracture and can result in significant motor impairment of the arm and the wrist. Objectives: To evaluate the incidence, pattern and outcome of the radial nerve injury following open fracture of the humerus. Material and ...

  11. The Radial Velocity Experiment (RAVE) : Second data release

    NARCIS (Netherlands)

    Zwitter, T.; Siebert, A.; Munari, U.; Freeman, K. C.; Siviero, A.; Watson, F. G.; Fulbright, J. P.; Wyse, R. F. G.; Campbell, R.; Seabroke, G. M.; Williams, M.; Steinmetz, M.; Bienayme, O.; Gilmore, G.; Grebel, E. K.; Helmi, A.; Navarro, J. F.; Anguiano, B.; Boeche, C.; Burton, D.; Cass, P.; Dawe, J.; Fiegert, K.; Hartley, M.; Russell, K.; Veltz, L.; Bailin, J.; Binney, J.; Bland-Hawthorn, J.; Brown, A.; Dehnen, W.; Evans, N. W.; Fiorentin, P. Re; Fiorucci, M.; Gerhard, O.; Gibson, B.; Kelz, A.; Kuijken, K.; Matijevic, G.; Minchev, I.; Parker, Q. A.; Penarrubia, J.; Quillen, A.; Read, M. A.; Reid, W.; Roeser, S.; Ruchti, G.; Scholz, R. -D.; Smith, M. C.; Sordo, R.; Tolstoi, E.; Tomasella, L.; Vidrih, S.; De Boer, E. Wylie

    We present the second data release of the Radial Velocity Experiment ( RAVE), an ambitious spectroscopic survey to measure radial velocities and stellar atmosphere parameters ( temperature, metallicity, surface gravity, and rotational velocity) of up to one million stars using the 6 dF multi-object

  12. A radial TPC for heavy ions

    CERN Document Server

    Garabatos, C

    2000-01-01

    The CERES experiment at the CERN SPS has been recently upgraded with a TPC with radial drift field, the first one of its sort. Constructed during 1998, it has been successfully operated in commissioning and physics runs, with muon, proton, and heavy-ion beams. A high voltage electrode of about 0.5 m radius is surrounded by sixteen 2 m long readout chambers, placed at a radius of 1.3 m, with chevron-shaped readout pads. The field cage is enclosed by two low-mass voltage degraders at each end of the cylindrical structure. A Ne-CO/sub 2/ [80-20] gas mixture allows for a safe operation and good transport properties under drift fields ranging from 200 to 600 V/cm. A spatial resolution better than 700 microns and 350 microns in r and rdelta (phi), respectively, has been achieved in a highly inhomogeneous magnetic field. Details of its construction as well as results of the operation and performance in a high multiplicity environment are presented. (0 refs).

  13. Experiments of a monolithic radial transmission line.

    Science.gov (United States)

    Mao, C; Wang, X; Zou, X; Lehr, J

    2016-11-01

    This paper presents the experimental results of a monolithic radial transmission line (MRTL) that may be used in pulsed power generators and microwave devices. The MRTL with a hyperbolic impedance profile is 508 mm in radius, corresponding to a one-way transit time of 15 ns for the electromagnetic wave. In the experiments, up to twenty identical voltage pulses, 10 ns in FWHM and 2 ns in rise-time, were fed into the MRTL through 20 input BNC connectors that are uniformly distributed along the outer circumference of the MRTL. It was found that the amplitude of the voltage from the output BNC connector located in the center of the MRTL is nearly proportional to the total number of the input branches. The effect of the failure modes on the output voltage was investigated. For the MRTL driven by 20 input branches, while the open-circuit or short-circuit even in one input branch considerably decreases the amplitude of the output voltage, the jitter shorter than 2 ns in 3 input branches makes no obvious effect on the output voltage.

  14. Radial Velocity Variability of Field Brown Dwarfs

    Science.gov (United States)

    Prato, L.; Mace, G. N.; Rice, E. L.; McLean, I. S.; Kirkpatrick, J. Davy; Burgasser, A. J.; Kim, Sungsoo S.

    2015-07-01

    We present paper six of the NIRSPEC Brown Dwarf Spectroscopic Survey, an analysis of multi-epoch, high-resolution (R ˜ 20,000) spectra of 25 field dwarf systems (3 late-type M dwarfs, 16 L dwarfs, and 6 T dwarfs) taken with the NIRSPEC infrared spectrograph at the W. M. Keck Observatory. With a radial velocity (RV) precision of ˜2 km s-1, we are sensitive to brown dwarf companions in orbits with periods of a few years or less given a mass ratio of 0.5 or greater. We do not detect any spectroscopic binary brown dwarfs in the sample. Given our target properties, and the frequency and cadence of observations, we use a Monte Carlo simulation to determine the detection probability of our sample. Even with a null detection result, our 1σ upper limit for very low mass binary frequency is 18%. Our targets included seven known, wide brown dwarf binary systems. No significant RV variability was measured in our multi-epoch observations of these systems, even for those pairs for which our data spanned a significant fraction of the orbital period. Specialized techniques are required to reach the high precisions sensitive to motion in orbits of very low-mass systems. For eight objects, including six T dwarfs, we present the first published high-resolution spectra, many with high signal to noise, that will provide valuable comparison data for models of brown dwarf atmospheres.

  15. Radial vibrations of a sodium ion inside icosahedral C60

    Science.gov (United States)

    Ballester, J. L.; Dunlap, B. I.

    1992-01-01

    The very high symmetry of icosahedral C60 suggests that, as a first approximation, an atom trapped inside C60 would be subject to a potential that is radially symmetric about the center. All-electron local-density-functional calculations of the total energy of a sodium ion as a function of radial displacement from the center along the fivefold axis of C60 serve to refine such a radial potential. In particular, the calculations suggest studying potentials that have minima displaced from the center. An analytic functional form for a radial potential having a positive cusp at the origin is proposed, and the s-wave radial solutions of the corresponding Schroedinger equation are examined.

  16. Radial head replacement with pyrocarbon prosthesis: early clinical results.

    Science.gov (United States)

    Abdulla, Irfan N; Molony, Diarmuid C; Symes, Michael; Cass, Benjamin

    2015-05-01

    Comminuted radial head fractures are challenging to treat with open reduction and internal fixation. Radial head arthroplasty is a favourable technique for the treatment of complex radial head fractures. The purpose of this study was to evaluate the functional and radiological outcomes of radial head arthroplasty using modular pyrocarbon radial head prosthesis. We retrospectively reviewed 21 consecutive patients requiring radial head arthroplasty for unreconstructible radial head fractures between July 2003 and July 2009. Patients completed a Short Form-36 (SF-36), the Disabilities of the Arm, Shoulder and Hand questionnaire, and the Mayo Elbow Performance Index. Patients were independently physically examined and their post-operative radiographs were reviewed. Twenty-one patients (nine males and 12 females) were reviewed at a minimum of 12 months follow-up. The mean Disabilities of the Arm, Shoulder and Hand score was 10.8 (0-34.1), mean SF-36 physical score was 76.9 (35-96), mean SF-36 mental score was 83.8 (60-94), and their Mayo Elbow Performance Index score was 86.4 (70-100). Patients maintained 90% of their grip strength when compared with their uninjured arm and had 17.5° of fixed flexion in the affected arm. Radiologically, 14 cases had some degree of post-traumatic osteoarthritis, 12 cases had evidence of heterotrophic ossification, five had some evidence of periprosthetic lucency and three patients were radiologically, but not functionally 'overstuffed'. Radial head arthroplasty with pyrocarbon radial head prosthesis is an acceptable option when treating unreconstructable radial head fractures yielding good functional and radiological outcomes. © 2014 Royal Australasian College of Surgeons.

  17. Numerical simulation of liquid-metal-flows in radial-toroidal-radial bends

    Energy Technology Data Exchange (ETDEWEB)

    Molokov, S.; Buehler, L.

    1993-09-01

    Magnetohydrodynamic flows in a U-bend and right-angle bend are considered with reference to the radial-toroidal-radial concept of a self-cooled liquid-metal blanket. The ducts composing bends have rectangular cross-section. The applied magnetic field is aligned with the toroidal duct and perpendicular to the radial ones. At high Hartmann number the flow region is divided into cores and boundary layers of different types. The magnetohydrodynamic equations are reduced to a system of partial differential equations governing wall electric potentials and the core pressure. The system is solved numerically by two different methods. The first method is iterative with iteration between wall potential and the core pressure. The second method is a general one for the solution of the core flow equations in curvilinear coordinates generated by channel geometry and magnetic field orientation. Results obtained are in good agreement. They show, that the 3D-pressure drop of MHD flows in a U-bend is not a critical issue for blanket applications. (orig./HP) [Deutsch] Untersucht werden magnetohydrodynamische Stroemungen in einer U-Umlenkung und in einer rechtwinkligen Umleknung, als Elemente eines selbstgekuehlten radial-toroidal-radialen Fluessigmetell-Blankets. Das angelegte Magnetfeld zeigt in Richtung des toroidalen Kanals und steht senkrecht zur radialen Richtung. Fuer grosse Hartmann-Zahlen teilt sich das Stroemungsgebiet in Kernstroemungsbereiche (Cores) und in Grenzschichten. Die magnetohydrodynamischen Gleichungen lassen sich zu einem System von partiellen Differentialgleichungen zur Bestimmung des elektrischen Potentials der Kanalwand und des Core-Drucks vereinfachen. Dieses System wird mit zwei verschiedenen Verfahren numerisch geloest. Bei der ersten Methode handelt es sich um ein iteratives Verfahren mit Iterationen zwischen den Werten des Wandpotentials und des Core-Drucks. Das zweite Verfahren ist ein allgemeines Verfahren zur Loesung der Kernstroemungsgleichungen in

  18. Scaling thermal effects in radial flow

    Science.gov (United States)

    Hudspeth, R. T.; Guenther, R. B.; Roley, K. L.; McDougal, W. G.

    To adequately evaluate the environmental impact of siting nuclear waste repositories in basalt aquicludes, it is essential to know the effects on parameter identification algorithms of thermal gradients that exist in these basaltic aquicludes. Temperatures of approximately 60°C and pressures of approximately 150 atm can be expected at potential repository sites located at depths of approximately 1000 m. The phenomenon of over-recovery has been observed in some pumping tests conducted at the Hanford Nuclear Reservation located in the Pasco Basin adjacent to the Columbia River in the state of Washington, USA. This over-recovery phenomenon may possibly be due to variations in the fluid density caused by thermal gradients. To assess the potential effects of these thermal gradients on indirect parameter identification algorithms, a systematic scaling of the governing field equations is required in order to obtain dimensionless equations based on the principle of similarity. The constitutive relationships for the specific weight of the fluid and for the porosity of the aquiclude are shown to be exponentially dependent on the pressure gradient. The dynamic pressure is converted to the piezometric head and the flow equation for the piezometric head is then scaled in radial coordinates. Order-of-magnitude estimates are made for all variables in unsteady flow for a typical well test in a basaltic aquiclude. Retaining all nonlinear terms, the parametric dependency of the flow equation on the classical dimensionless thermal and hydraulic parameters is demonstrated. These classical parameters include the Batchelor, Fourier, Froude, Grashof, and Reynolds Numbers associated with thermal flows. The flow equation is linearized from order-of-magnitude estimates based on these classical parameters for application in parameter identification algorithms.

  19. Scaling laws for radial foil bearings

    Science.gov (United States)

    Honavara Prasad, Srikanth

    The effects of fluid pressurization, structural deformation of the compliant members and heat generation in foil bearings make the design and analysis of foil bearings very complicated. The complex fluid-structural-thermal interactions in foil bearings also make modeling efforts challenging because these phenomena are governed by highly non-linear partial differential equations. Consequently, comparison of various bearing designs require detailed calculation of the flow fields (velocities, pressures), bump deflections (structural compliance) and heat transfer phenomena (viscous dissipation in the fluid, frictional heating, temperature profile etc.,) resulting in extensive computational effort (time/hardware). To obviate rigorous computations and aid in feasibility assessments of foil bearings of various sizes, NASA developed the "rule of thumb" design guidelines for estimation of journal bearing load capacity. The guidelines are based on extensive experimental data. The goal of the current work is the development of scaling laws for radial foil bearings to establish an analytical "rule of thumb" for bearing clearance and bump stiffness. The use of scale invariant Reynolds equation and experimentally observed NASA "rule of thumb" yield scale factors which can be deduced from first principles. Power-law relationships between: a. Bearing clearance and bearing radius, and b. bump stiffness and bearing radius, are obtained. The clearance and bump stiffness values obtained from scaling laws are used as inputs for Orbit simulation to study various cases. As the clearance of the bearing reaches the dimensions of the material surface roughness, asperity contact breaks the fluid film which results in wear. Similarly, as the rotor diameter increases (requiring larger bearing diameters), the load capacity of the fluid film should increase to prevent dry rubbing. This imposes limits on the size of the rotor diameter and consequently bearing diameter. Therefore, this thesis aims

  20. TRUE MASSES OF RADIAL-VELOCITY EXOPLANETS

    Energy Technology Data Exchange (ETDEWEB)

    Brown, Robert A., E-mail: rbrown@stsci.edu [Space Telescope Science Institute (United States)

    2015-06-01

    We study the task of estimating the true masses of known radial-velocity (RV) exoplanets by means of direct astrometry on coronagraphic images to measure the apparent separation between exoplanet and host star. Initially, we assume perfect knowledge of the RV orbital parameters and that all errors are due to photon statistics. We construct design reference missions for four missions currently under study at NASA: EXO-S and WFIRST-S, with external star shades for starlight suppression, EXO-C and WFIRST-C, with internal coronagraphs. These DRMs reveal extreme scheduling constraints due to the combination of solar and anti-solar pointing restrictions, photometric and obscurational completeness, image blurring due to orbital motion, and the “nodal effect,” which is the independence of apparent separation and inclination when the planet crosses the plane of the sky through the host star. Next, we address the issue of nonzero uncertainties in RV orbital parameters by investigating their impact on the observations of 21 single-planet systems. Except for two—GJ 676 A b and 16 Cyg B b, which are observable only by the star-shade missions—we find that current uncertainties in orbital parameters generally prevent accurate, unbiased estimation of true planetary mass. For the coronagraphs, WFIRST-C and EXO-C, the most likely number of good estimators of true mass is currently zero. For the star shades, EXO-S and WFIRST-S, the most likely numbers of good estimators are three and four, respectively, including GJ 676 A b and 16 Cyg B b. We expect that uncertain orbital elements currently undermine all potential programs of direct imaging and spectroscopy of RV exoplanets.

  1. Radial head fracture associated with posterior interosseous nerve injury

    Directory of Open Access Journals (Sweden)

    Bernardo Barcellos Terra

    Full Text Available ABSTRACT Fractures of the radial head and radial neck correspond to 1.7-5.4% of all fractures and approximately 30% may present associated injuries. In the literature, there are few reports of radial head fracture with posterior interosseous nerve injury. This study aimed to report a case of radial head fracture associated with posterior interosseous nerve injury. CASE REPORT: A male patient, aged 42 years, sought medical care after falling from a skateboard. The patient related pain and limitation of movement in the right elbow and difficulty to extend the fingers of the right hand. During physical examination, thumb and fingers extension deficit was observed. The wrist extension showed a slight radial deviation. After imaging, it became evident that the patient had a fracture of the radial head that was classified as grade III in the Mason classification. The patient underwent fracture fixation; at the first postoperative day, thumb and fingers extension was observed. Although rare, posterior interosseous nerve branch injury may be associated with radial head fractures. In the present case, the authors believe that neuropraxia occurred as a result of the fracture hematoma and edema.

  2. Crustal radial anisotropy beneath Cameroon from ambient noise tomography

    Science.gov (United States)

    Ojo, Adebayo Oluwaseun; Ni, Sidao; Li, Zhiwei

    2017-01-01

    To increase the understanding of crustal deformation and crustal flow patterns due to tectonic processes in Cameroon, we study the lateral variability of the crustal isotropic velocity and radial anisotropy estimated using Ambient Noise Tomography (ANT). Rayleigh and Love wave Noise Correlation Functions (NCFs) were retrieved from the cross-correlation of seismic ambient noise data recorded in Cameroon, and phase velocities at periods of 8 to 30 s were measured to perform surface wave tomography. Joint inversion of Rayleigh and Love wave data for isotropic velocity models could not fit the observed dispersions simultaneously. We attribute the Love-Rayleigh discrepancy to the presence of radial anisotropy in the crust and estimated its magnitude. Our 3-D radial anisotropic model reveals the spatial variation of strong to weak positive (Vsh > Vsv) and negative (Vsv > Vsh) radial anisotropy in the crust. We observe negative radial anisotropy in the upper crust that is associated mainly with the location of a previously reported mantle plume. The anisotropy could be attributed to the vertical alignment of fossil microcracks or metamorphic foliations due to the upwelling of plume material. A strong positive radial anisotropy is centered at the location of an inferred boundary between the Congo Craton and the Oubanguides Belt that might be related to the preferred orientation of crustal anisotropic minerals associated with shearing in this fault zone. The middle crust is characterized by a widespread negative radial anisotropy that is likely caused by the flow-induced alignment of anisotropic minerals that crystallized during magma intrusion. The magnitude of the radial anisotropy varies systematically from predominantly negative in the middle crust to positive in the lower crust. The imaged patterns of the isotropic velocity and radial anisotropy are consistent with previous studies and agree with regional tectonics.

  3. Thumb ulnar collateral and radial collateral ligament injuries.

    Science.gov (United States)

    Schroeder, Nicole S; Goldfarb, Charles A

    2015-01-01

    Thumb metacarpophalangeal ulnar and radial collateral ligament injuries occur frequently in the competitive athlete. Collateral ligament integrity is essential to joint stability, pinch strength, and pain-free motion. Acute rupture of the ulnar collateral ligament is due to a sudden radial deviation force on the abducted thumb and is referred to as skier's thumb. An ulnar-directed force causes injury to the radial collateral ligament. The degree of joint instability on clinical examination allows classification of these injuries and guides management. Surgical repair of acute, complete tears results in good outcomes and allows for return to sporting activity. Copyright © 2015 Elsevier Inc. All rights reserved.

  4. Sharp Edges in Saturn's Rings: Radial Structure and Longitudinal Variability

    Science.gov (United States)

    Colwell, Joshua E.; Jerousek, R. G.; Esposito, L. W.

    2010-10-01

    The Cassini Ultraviolet Imaging Spectrograph has observed more than 100 occultations of stars by Saturn's rings with a typical ring plane radial resolution of preventing a fit from our smooth model. We find that the radial scale, characterized by a sigmoid function, over which the ring optical depth declines is typically 10-20 m. We are unable to place a tight constraint on the vertical thickness of the ring, however, because the light curve is dominated by the scale of the radial variation. We find large variability in the structure of the edges with no clear correlation to known possible perturbers in the system.

  5. Mixed Lubrication Solution of Dynamically Loaded Radial Slide Bearings

    Directory of Open Access Journals (Sweden)

    P. Novotny

    2017-03-01

    Full Text Available A solution of radial slide bearing dynamics and tribology incorporating the influences of real surface roughness contacts or the influence of surface roughness on bearing lubrication is presented in this paper. Finite difference method for Reynolds equation discretization, finite element method for calculation of elastic deformations, Gauss-Seidel’s method for iterative solution of discretized equations or Newmark’s algorithm are the methods employed in the proposed solution approach. The coupled structural-fluid solver considering mixed lubrication conditions of the radial bearings is the result. The proposed algorithms are presented for highly loaded radial slide bearing of internal combustion engine.

  6. Prototyping of radial plates for fusion relevant superconducting magnets

    Science.gov (United States)

    Ghate, M.; Bhavasar, D.; Panchal, A.; Udgata, S.; Pradhan, S.

    2017-04-01

    The fabrication trials for prototype radial plate to support its conceptual design and development for fusion relevant superconducting magnet have been discussed in this paper. The simulation approach with CAD has been presented for prototyping of radial plates. Extensive trials have been done on SS316LN plates to estimate and establish machining sequences, machine parameters, machining tools to achieve required tolerances. The critical machining operation and parameters has been discussed in this paper. Inspection procedures with articulated arm coordinate measuring machine for prototype radial plate has been conceptualized and verified.

  7. Channeling of protons through radial deformed carbon nanotubes

    Science.gov (United States)

    Borka Jovanović, V.; Borka, D.; Galijaš, S. M. D.

    2017-05-01

    In this paper we have presented a theoretical investigation of the channeling of 1 GeV protons with the radial deformed (10, 0) single-wall carbon nanotubes (SWNTs). We have calculated channeling potential within the deformed nanotubes. For the first time we presented theoretically obtained spatial and angular distributions of channeled protons with radially deformed SWNT. We used a Monte Carlo (MC) simulation technique. We show that the spatial and angular distributions depend strongly of level of radial deformation of nanotube. These results may be useful for nanotube characterization and production and guiding of nanosized ion beams.

  8. 16PF-E Structure using Radial Parcels Versus Items.

    Science.gov (United States)

    Hughey, Joseph; Burdsal, Charles

    1982-07-01

    The Sixteen Personality Factor Questionnaire (16PF) was factored with the use of groups of items called radial parcels and was subsequently compared with an item factoring of the same data. This was done in order to verify the 16PF (Form E) primary factors and to investigate the use of radial parcels in that process. Ss were 449 physically or mentally handicapped men and women who were part of a rehabilitation counseling process. Results indicated that with some familiar exceptions factor identification and verification were complete. Moreover, the use of radial parcels maintained the dimensionality found in the items. Also, rotation toward simple structure proceeded more rapidly with parcels than with items.

  9. Dependence of radiation belt simulations to assumed radial diffusion rates tested for two empirical models of radial transport

    Science.gov (United States)

    Drozdov, Alexander; Shprits, Yuri; Aseev, Nikita; Kellerman, Adam; Reeves, Geoffrey

    2017-04-01

    Radial diffusion is one of the dominant physical mechanisms that drives acceleration and loss of the radiation belt electrons, which makes it very important for nowcasting and forecasting space weather models. We investigate the sensitivity of the two parameterizations of the radial diffusion of Brautigam and Albert [2000] and Ozeke et al. [2014] on long-term radiation belt modeling using the Versatile Electron Radiation Belt (VERB). Following Brautigam and Albert [2000] and Ozeke et al. [2014], we first perform 1-D radial diffusion simulations. Comparison of the simulation results with observations shows that the difference between simulations with either radial diffusion parameterization is small. To take into account effects of local acceleration and loss, we perform 3-D simulations, including pitch-angle, energy and mixed diffusion. We found that the results of 3-D simulations are even less sensitive to the choice of parameterization of radial diffusion rates than the results of 1-D simulations at various energies (from 0.59 to 1.80 MeV). This result demonstrates that the inclusion of local acceleration and pitch-angle diffusion can provide a negative feedback effect, such that the result is largely indistinguishable simulations conducted with different radial diffusion parameterizations. We also perform a number of sensitivity tests by multiplying radial diffusion rates by constant factors and show that such an approach leads to unrealistic predictions of radiation belt dynamics. References Brautigam, D. H., and J. M. Albert (2000), Radial diffusion analysis of outer radiation belt electrons during the October 9, 1990, magnetic storm, J. Geophys. Res., 105(A1), 291-309, doi:10.1029/1999ja900344. Ozeke, L. G., I. R. Mann, K. R. Murphy, I. Jonathan Rae, and D. K. Milling (2014), Analytic expressions for ULF wave radiation belt radial diffusion coefficients, J. Geophys. Res. [Space Phys.], 119(3), 1587-1605, doi:10.1002/2013JA019204.

  10. Analytic expressions for ULF wave radiation belt radial diffusion coefficients

    National Research Council Canada - National Science Library

    Ozeke, Louis G; Mann, Ian R; Murphy, Kyle R; Jonathan Rae, I; Milling, David K

    2014-01-01

    We present analytic expressions for ULF wave‐derived radiation belt radial diffusion coefficients, as a function of L and Kp , which can easily be incorporated into global radiation belt transport models...

  11. On the classification enhancement of radial basis function networks

    NARCIS (Netherlands)

    Ciftcioglu, O.; Durmisevic, S.; Sariyildiz, I.S.

    2001-01-01

    Artificial neural networks are powerfultools for analysing information expressed as data sets, which contain complex nonlinear relationships to be identified and classified. In particular radial basis function (RBF) neural networks have outstanding features for this. However, due to far reaching

  12. Endoscopic Radial Artery Harvest for Coronary Artery Bypass Surgery

    Directory of Open Access Journals (Sweden)

    Kuan-Ming Chiu

    2006-01-01

    Conclusion: Endoscopic harvest of the radial artery is technically demanding, but excellent results can be achieved. The endoscopic approach can provide suitable conduits in a less invasive way than the open harvest technique.

  13. Radial Nerve Injury after Brachial Nerve Block - Case Series

    Directory of Open Access Journals (Sweden)

    Szederjesi Janos

    2016-03-01

    Full Text Available Adding epinephrine to local anesthetics is recommended to extend the duration of peripheral nerve blocks. We describe in this article two cases of radial nerve injury possible due to coadministration of epinephrine during brachial plexus block.

  14. Radial inflow gas turbine engine with advanced transition duct

    Science.gov (United States)

    Wiebe, David J

    2015-03-17

    A gas turbine engine (10), including: a turbine having radial inflow impellor blades (38); and an array of advanced transition combustor assemblies arranged circumferentially about the radial inflow impellor blades (38) and having inner surfaces (34) that are adjacent to combustion gases (40). The inner surfaces (34) of the array are configured to accelerate and orient, for delivery directly onto the radial inflow impellor blades (38), a plurality of discrete flows of the combustion gases (40). The array inner surfaces (34) define respective combustion gas flow axes (20). Each combustion gas flow axis (20) is straight from a point of ignition until no longer bound by the array inner surfaces (34), and each combustion gas flow axis (20) intersects a unique location on a circumference defined by a sweep of the radial inflow impellor blades (38).

  15. Radial Forcing and Edgar Allan Poe's Lengthening Pendulum

    CERN Document Server

    McMillan, Matthew; Whitney, Heather M

    2013-01-01

    Inspired by Edgar Allan Poe's The Pit and the Pendulum, we investigate a radially driven, lengthening pendulum. We first show that increasing the length of an undriven pendulum at a uniform rate does not amplify the oscillations in a manner consistent with the behavior of the scythe in Poe's story. We discuss parametric amplification and the transfer of energy (through the parameter of the pendulum's length) to the oscillating part of the system. In this manner radial driving may easily and intuitively be understood, and the fundamental concept applied in many other areas. We propose and show by a numerical model that appropriately timed radial forcing can increase the oscillation amplitude in a manner consistent with Poe's story. Our analysis contributes a computational exploration of the complex harmonic motion that can result from radially driving a pendulum, and sheds light on a mechanism by which oscillations can be amplified parametrically. These insights should prove especially valuable in the undergra...

  16. The star formation history of CALIFA galaxies: Radial structures

    National Research Council Canada - National Science Library

    González Delgado, R. M; Pérez, E; Cid Fernandes, R; García-Benito, R; de Amorim, A. L; Sánchez, S. F; Husemann, B; Cortijo-Ferrero, C; López Fernández, R; Sánchez-Blázquez, P; Bekeraite, S; Walcher, C. J; Falcón-Barroso, J; Gallazzi, A; van de Ven, G; Alves, J; Bland-Hawthorn, J; Kennicutt, R. C; Kupko, D; Lyubenova, M; Mast, D; Mollá, M; Marino, R. A; Quirrenbach, A; Vílchez, J. M; Wisotzki, L

    2014-01-01

    We have studied the radial structure of the stellar mass surface density (μ∗) and stellar population age as a function of the total stellar mass and morphology for a sample of 107 galaxies from the CALIFA survey...

  17. Radial artery pseudo aneurysm after percutaneous cannulation using Seldinger technique

    Directory of Open Access Journals (Sweden)

    Anil Ranganath

    2011-01-01

    Full Text Available Cannulation of a peripheral artery in a patient allows for continuous blood pressure (BP monitoring and facilitates frequent arterial blood gas (ABG analysis. Complications include thrombosis, embolism risk, haemorrhage, sepsis, and formation of pseudo aneurysms. A 75-year-old male admitted via casualty with a collapse secondary to seizures. Patient was intubated and mechanically ventilated for 7 days. A right radial artery catheter was inserted on admission to casualty. The arterial catheter remained in situ for 7 days. Five days following its removal, the skin site appeared inflamed and a wound swab grew methicillin resistant Staphylococcus aureus (MRSA. Eight days later a distinct bulging of the radial artery was noticed. An ultrasound was done and it showed radial artery pseudoaneurysm, the diagnosis was confirmed by angiogram. Delayed radial artery pseudoaneurysm formation has only been reported in association with infection, and less than twenty of these cases have been reported in the literature.

  18. Messrad mit mehreren kombinierten Radial-/Tangentialverbindungen: Messrad (A)

    OpenAIRE

    Neugebauer, J.; Grubisic, V.; Rupp, A.

    1998-01-01

    In summary, the invention provides a measuring wheel comprising a hub, a rim and at least one connection arrangement between the hub and the rim and comprising one or several measuring elements in or on the connection arrangement for measuring forces and/or torques which act on the rotating measuring wheel. The connection arrangement in the hub and the rim comprises a radial/tangential connection device and an axial connection device. The radial/tangential connection device is designed so tha...

  19. Radial Basis Function Based Quadrature over Smooth Surfaces

    Science.gov (United States)

    2016-03-24

    Stieltjessche Integrale und Harmonische Analyse,” Math . Ann., vol. 108, pp. 378–410, 1933. 12. I. J. Schoenberg, “Metric Spaces and Positive Definite Functions ...Fornberg, “Interpolation in the Limit of Increasingly Flat Radial Basis Functions ,” Comput. Math . Appl., vol. 43, pp. 413–422, 2002. 83 REPORT...Radial Basis Function Based Quadrature over Smooth Surfaces THESIS March 2016 Maloupu L. Watts, Second Lieutenant, USAF AFIT-ENC-MS-16-M-003

  20. Radial, renal and craniofacial anomalies: Baller-Gerold syndrome

    Directory of Open Access Journals (Sweden)

    Murthy Jyotsna

    2008-01-01

    Full Text Available The Baller-Gerold syndrome is a rare syndrome with very few cases published in literature. Craniosynostosis and radial aplasia are striking features, easy to diagnose. However, there are many differential diagnoses. Often, the question raised is whether the Baller-Gerald syndrome is a distinct entity. We report a patient with findings of craniosynostosis and radial aplasia consistent with the diagnosis of the Baller-Gerold syndrome. Genotypic heterogeneity could possibly underlie the phenotypic variability exhibited by these cases.

  1. Radial variations of wood different properties in Diospyros lotus

    OpenAIRE

    Majid Kiaei; Reza Bakhshi

    2014-01-01

    Aim of study: The aim of this study was to determine some of the physical, biometry and mechanical strength properties of Diospyros lotus L. wood along radial direction from the pith to the bark and the relationship between wood various properties. Area of study: The study area is located in north Iran in the province of Mazandarn. Material and methods: Testing samples were taken at breast height of tree stem and three radial position of stem radius to determine physical (basic density), fibe...

  2. Channeling of protons through radial deformed carbon nanotubes

    Energy Technology Data Exchange (ETDEWEB)

    Borka Jovanović, V., E-mail: vborka@vinca.rs [Atomic Physics Laboratory (040), Vinča Institute of Nuclear Sciences, University of Belgrade, P.O. Box 522, 11001 Belgrade (Serbia); Borka, D. [Atomic Physics Laboratory (040), Vinča Institute of Nuclear Sciences, University of Belgrade, P.O. Box 522, 11001 Belgrade (Serbia); Galijaš, S.M.D. [Faculty of Physics, University of Belgrade, P.O. Box 368, 11001 Belgrade (Serbia)

    2017-05-18

    Highlights: • For the first time we presented theoretically obtained distributions of channeled protons with radially deformed SWNT. • Our findings indicate that influence of the radial deformation is very strong and it should not be omitted in simulations. • We show that the spatial and angular distributions depend strongly of level of radial deformation of nanotube. • Our obtained results can be compared with measured distributions to reveal the presence of various types of defects in SWNT. - Abstract: In this paper we have presented a theoretical investigation of the channeling of 1 GeV protons with the radial deformed (10, 0) single-wall carbon nanotubes (SWNTs). We have calculated channeling potential within the deformed nanotubes. For the first time we presented theoretically obtained spatial and angular distributions of channeled protons with radially deformed SWNT. We used a Monte Carlo (MC) simulation technique. We show that the spatial and angular distributions depend strongly of level of radial deformation of nanotube. These results may be useful for nanotube characterization and production and guiding of nanosized ion beams.

  3. Analytic expressions for ULF wave radiation belt radial diffusion coefficients.

    Science.gov (United States)

    Ozeke, Louis G; Mann, Ian R; Murphy, Kyle R; Jonathan Rae, I; Milling, David K

    2014-03-01

    We present analytic expressions for ULF wave-derived radiation belt radial diffusion coefficients, as a function of L and Kp, which can easily be incorporated into global radiation belt transport models. The diffusion coefficients are derived from statistical representations of ULF wave power, electric field power mapped from ground magnetometer data, and compressional magnetic field power from in situ measurements. We show that the overall electric and magnetic diffusion coefficients are to a good approximation both independent of energy. We present example 1-D radial diffusion results from simulations driven by CRRES-observed time-dependent energy spectra at the outer boundary, under the action of radial diffusion driven by the new ULF wave radial diffusion coefficients and with empirical chorus wave loss terms (as a function of energy, Kp and L). There is excellent agreement between the differential flux produced by the 1-D, Kp-driven, radial diffusion model and CRRES observations of differential electron flux at 0.976 MeV-even though the model does not include the effects of local internal acceleration sources. Our results highlight not only the importance of correct specification of radial diffusion coefficients for developing accurate models but also show significant promise for belt specification based on relatively simple models driven by solar wind parameters such as solar wind speed or geomagnetic indices such as Kp. Analytic expressions for the radial diffusion coefficients are presentedThe coefficients do not dependent on energy or wave m valueThe electric field diffusion coefficient dominates over the magnetic.

  4. Comminuted fractures of the radial head: resection or prosthesis?

    Science.gov (United States)

    Lópiz, Yaiza; González, Ana; García-Fernández, Carlos; García-Coiradas, Javier; Marco, Fernando

    2016-09-01

    At present, surgical treatment of comminuted radial head fractures without associated instability continues to be controversial. When anatomical reconstruction is not possible, radial head excision is performed. However, the appearance of long-term complications with this technique, along with the development of new radial head implants situates arthroplasty as a promising surgical alternative. The purpose of the present study was to compare the mid-term functional outcomes of both techniques. A retrospective study was performed between 2002 and 2011 on 25 Mason type-III fractures, 11 patients treated with primary radial head resection and 14 who received treatment of the fracture with metal prosthesis. At the end of follow-up, patients were contacted and outcomes evaluated according to: Mayo Elbow Performance Score (MEPS), the Disabilities of the Arm, Shoulder and Hand score (DASH) and strength measurement. Radiographic assessment (proximal migration of the radius, osteoarthritic changes, and signs of prosthesis loosening) was also performed. The average age of the sample was 53.7 years in the resection group, and 54.4 years in the replacement group, with a mean follow-up of 60.3 and 42 months respectively. According to the MEPS scale, there were 6 excellent cases, 3 good and 2 acceptable in the resection group, and 6 excellent cases, 3 good, 3 acceptable, and 2 poor in the prosthesis group. The mean DASH score were 13.5, and 24.8 for the resection and the replacement group respectively. We found one postoperative complication in the resection group (stiffness and valgus instability) and 6 in the replacement group: 3 of joint stiffness, 1 case of prosthesis breakage, and 2 neurological injuries. Although this is a retrospective study, the high complication rate occurring after radial head replacement in comparison with radial head resection, as well as good functional results obtained with this last technique, leads us to recommend it for comminuted radial head

  5. O-space with high resolution readouts outperforms radial imaging.

    Science.gov (United States)

    Wang, Haifeng; Tam, Leo; Kopanoglu, Emre; Peters, Dana C; Constable, R Todd; Galiana, Gigi

    2017-04-01

    While O-Space imaging is well known to accelerate image acquisition beyond traditional Cartesian sampling, its advantages compared to undersampled radial imaging, the linear trajectory most akin to O-Space imaging, have not been detailed. In addition, previous studies have focused on ultrafast imaging with very high acceleration factors and relatively low resolution. The purpose of this work is to directly compare O-Space and radial imaging in their potential to deliver highly undersampled images of high resolution and minimal artifacts, as needed for diagnostic applications. We report that the greatest advantages to O-Space imaging are observed with extended data acquisition readouts. A sampling strategy that uses high resolution readouts is presented and applied to compare the potential of radial and O-Space sequences to generate high resolution images at high undersampling factors. Simulations and phantom studies were performed to investigate whether use of extended readout windows in O-Space imaging would increase k-space sampling and improve image quality, compared to radial imaging. Experimental O-Space images acquired with high resolution readouts show fewer artifacts and greater sharpness than radial imaging with equivalent scan parameters. Radial images taken with longer readouts show stronger undersampling artifacts, which can cause small or subtle image features to disappear. These features are preserved in a comparable O-Space image. High resolution O-Space imaging yields highly undersampled images of high resolution and minimal artifacts. The additional nonlinear gradient field improves image quality beyond conventional radial imaging. Copyright © 2016 Elsevier Inc. All rights reserved.

  6. Rehabilitation for distal radial fractures in adults.

    Science.gov (United States)

    Handoll, Helen H G; Elliott, Joanne

    2015-09-25

    Fracture of the distal radius is a common clinical problem, particularly in older people with osteoporosis. There is considerable variation in the management, including rehabilitation, of these fractures. This is an update of a Cochrane review first published in 2002 and last updated in 2006. To examine the effects of rehabilitation interventions in adults with conservatively or surgically treated distal radial fractures. We searched the Cochrane Bone, Joint and Muscle Trauma Group Specialised Register, the Cochrane Central Register of Controlled Trials (CENTRAL 2014; Issue 12), MEDLINE, EMBASE, CINAHL, AMED, PEDro, OTseeker and other databases, trial registers, conference proceedings and reference lists of articles. We did not apply any language restrictions. The date of the last search was 12 January 2015. Randomised controlled trials (RCTs) or quasi-RCTs evaluating rehabilitation as part of the management of fractures of the distal radius sustained by adults. Rehabilitation interventions such as active and passive mobilisation exercises, and training for activities of daily living, could be used on their own or in combination, and be applied in various ways by various clinicians. The review authors independently screened and selected trials, and reviewed eligible trials. We contacted study authors for additional information. We did not pool data. We included 26 trials, involving 1269 mainly female and older patients. With few exceptions, these studies did not include people with serious fracture or treatment-related complications, or older people with comorbidities and poor overall function that would have precluded trial participation or required more intensive treatment. Only four of the 23 comparisons covered by these 26 trials were evaluated by more than one trial. Participants of 15 trials were initially treated conservatively, involving plaster cast immobilisation. Initial treatment was surgery (external fixation or internal fixation) for all participants

  7. A Refined Radial Velocity Curve for the L Dwarf Donor of WZ Sagittae

    Science.gov (United States)

    Harrison, Thomas E.

    2017-12-01

    We have obtained a radial velocity curve for the L dwarf donor in WZ Sagittae using phase-resolved J-band spectra obtained with GNIRS on Gemini-north. We find a radial velocity semi-amplitude of {K}2=525+/- 11 {km} {{{s}}}-1. This result reduces the error bar by a factor of three over previous attempts. A relatively strong, unidentified emission line centered near 1.177 μm, corrupts the blue K i doublet in these data. While an H i emission feature near 1.2527 μm distorts the depth of the red K i doublet. In addition, a weak H i emission line at 1.1969 μm falls in the middle of the strongest FeH feature in these spectra. The combination of these contaminants prevents us from precisely constraining the spectral type of the donor. The strength of the absorption features remains consistent with an early L spectral type. Based on observations obtained at the Gemini Observatory, which is operated by the Association of Universities for Research in Astronomy, Inc., under a cooperative agreement with the NSF on behalf of the Gemini partnership: the National Science Foundation (United States), the National Research Council (Canada), CONICYT (Chile), Ministerio de Ciencia, Tecnología e Innovación Productiva (Argentina), and Ministério da Ciência, Tecnologia e Inovação (Brazil).

  8. Observational hints of radial migration in disc galaxies from CALIFA

    Science.gov (United States)

    Ruiz-Lara, T.; Pérez, I.; Florido, E.; Sánchez-Blázquez, P.; Méndez-Abreu, J.; Sánchez-Menguiano, L.; Sánchez, S. F.; Lyubenova, M.; Falcón-Barroso, J.; van de Ven, G.; Marino, R. A.; de Lorenzo-Cáceres, A.; Catalán-Torrecilla, C.; Costantin, L.; Bland-Hawthorn, J.; Galbany, L.; García-Benito, R.; Husemann, B.; Kehrig, C.; Márquez, I.; Mast, D.; Walcher, C. J.; Zibetti, S.; Ziegler, B.; Califa Team

    2017-07-01

    Context. According to numerical simulations, stars are not always kept at their birth galactocentric distances but they have a tendency to migrate. The importance of this radial migration in shaping galactic light distributions is still unclear. However, if radial migration is indeed important, galaxies with different surface brightness (SB) profiles must display differences in their stellar population properties. Aims: We investigate the role of radial migration in the light distribution and radial stellar content by comparing the inner colour, age, and metallicity gradients for galaxies with different SB profiles. We define these inner parts, avoiding the bulge and bar regions and up to around three disc scale lengths (type I, pure exponential) or the break radius (type II, downbending; type III, upbending). Methods: We analysed 214 spiral galaxies from the CALIFA survey covering different SB profiles. We made use of GASP2D and SDSS data to characterise the light distribution and obtain colour profiles of these spiral galaxies. The stellar age and metallicity profiles were computed using a methodology based on full-spectrum fitting techniques (pPXF, GANDALF, and STECKMAP) to the Integral Field Spectroscopic CALIFA data. Results: The distributions of the colour, stellar age, and stellar metallicity gradients in the inner parts for galaxies displaying different SB profiles are unalike as suggested by Kolmogorov-Smirnov and Anderson-Darling tests. We find a trend in which type II galaxies show the steepest profiles of all, type III show the shallowest, and type I display an intermediate behaviour. Conclusions: These results are consistent with a scenario in which radial migration is more efficient for type III galaxies than for type I systems, where type II galaxies present the lowest radial migration efficiency. In such a scenario, radial migration mixes the stellar content, thereby flattening the radial stellar properties and shaping different SB profiles. However

  9. Comparison of Deterministic and Probabilistic Radial Distribution Systems Load Flow

    Science.gov (United States)

    Gupta, Atma Ram; Kumar, Ashwani

    2017-08-01

    Distribution system network today is facing the challenge of meeting increased load demands from the industrial, commercial and residential sectors. The pattern of load is highly dependent on consumer behavior and temporal factors such as season of the year, day of the week or time of the day. For deterministic radial distribution load flow studies load is taken as constant. But, load varies continually with a high degree of uncertainty. So, there is a need to model probable realistic load. Monte-Carlo Simulation is used to model the probable realistic load by generating random values of active and reactive power load from the mean and standard deviation of the load and for solving a Deterministic Radial Load Flow with these values. The probabilistic solution is reconstructed from deterministic data obtained for each simulation. The main contribution of the work is: Finding impact of probable realistic ZIP load modeling on balanced radial distribution load flow. Finding impact of probable realistic ZIP load modeling on unbalanced radial distribution load flow. Compare the voltage profile and losses with probable realistic ZIP load modeling for balanced and unbalanced radial distribution load flow.

  10. Comparison of Deterministic and Probabilistic Radial Distribution Systems Load Flow

    Science.gov (United States)

    Gupta, Atma Ram; Kumar, Ashwani

    2017-12-01

    Distribution system network today is facing the challenge of meeting increased load demands from the industrial, commercial and residential sectors. The pattern of load is highly dependent on consumer behavior and temporal factors such as season of the year, day of the week or time of the day. For deterministic radial distribution load flow studies load is taken as constant. But, load varies continually with a high degree of uncertainty. So, there is a need to model probable realistic load. Monte-Carlo Simulation is used to model the probable realistic load by generating random values of active and reactive power load from the mean and standard deviation of the load and for solving a Deterministic Radial Load Flow with these values. The probabilistic solution is reconstructed from deterministic data obtained for each simulation. The main contribution of the work is: Finding impact of probable realistic ZIP load modeling on balanced radial distribution load flow. Finding impact of probable realistic ZIP load modeling on unbalanced radial distribution load flow. Compare the voltage profile and losses with probable realistic ZIP load modeling for balanced and unbalanced radial distribution load flow.

  11. Influence of Radial Stress Gradient on Strainbursts: An Experimental Study

    Science.gov (United States)

    Su, Guoshao; Zhai, Shaobin; Jiang, Jianqing; Zhang, Gangliang; Yan, Liubin

    2017-10-01

    Strainbursts, which are violent disasters that are accompanied by the ejection failure of rocks, usually occur in hard brittle rocks around highly stressed underground openings. The release of the radial stress at excavation boundaries is one of the major inducing factors for strainbursts in tunnels. After excavation, the radial stress usually exhibits different but apparent gradient variations along the radial direction near the boundary within a certain depth under different in situ stress conditions. In this study, the influence of the radial stress gradient on strainbursts of granite was investigated using an improved true-triaxial rockburst testing system, which was equipped with an acoustic emission monitoring system. The stress state and boundary conditions (i.e., one face free, other faces loaded and increasing tangential stress) of the representative rock element in the vicinity of the excavation boundary were simulated. High-speed cameras were used to capture the ejection failure processes during strainbursts, and the kinetic energy of ejected fragments was quantitatively estimated by analyzing the recorded videos. The experimental results indicate that with an increasing radial stress gradient, the strength increases, the apparent yield platform prior to the peak stress on the stress-strain curves decreases, the failure mode changes from strainburst characterized by tensile splitting to strainburst characterized by shear rupture, and the kinetic energy of ejected fragments during strainbursts significantly increases.

  12. Radial Structure Scaffolds Convolution Patterns of Developing Cerebral Cortex

    Directory of Open Access Journals (Sweden)

    Mir Jalil Razavi

    2017-08-01

    Full Text Available Commonly-preserved radial convolution is a prominent characteristic of the mammalian cerebral cortex. Endeavors from multiple disciplines have been devoted for decades to explore the causes for this enigmatic structure. However, the underlying mechanisms that lead to consistent cortical convolution patterns still remain poorly understood. In this work, inspired by prior studies, we propose and evaluate a plausible theory that radial convolution during the early development of the brain is sculptured by radial structures consisting of radial glial cells (RGCs and maturing axons. Specifically, the regionally heterogeneous development and distribution of RGCs controlled by Trnp1 regulate the convex and concave convolution patterns (gyri and sulci in the radial direction, while the interplay of RGCs' effects on convolution and axons regulates the convex (gyral convolution patterns. This theory is assessed by observations and measurements in literature from multiple disciplines such as neurobiology, genetics, biomechanics, etc., at multiple scales to date. Particularly, this theory is further validated by multimodal imaging data analysis and computational simulations in this study. We offer a versatile and descriptive study model that can provide reasonable explanations of observations, experiments, and simulations of the characteristic mammalian cortical folding.

  13. Development, comparison, and evaluation of software for radial distortion elimination

    Science.gov (United States)

    Papadaki, A. I.; Georgopoulos, A.

    2015-05-01

    Lately the interest of Computer Vision and Photogrammetry community has been focused on the automation of the processes of identification and elimination of the radial distortion, with the aim to correct the image coordinates and finally to obtain digital images with reliable geometric information. This effort has reached the point of development of commercial or free image processing software, claiming that it can automatically identify and remove the radial distortion from an image. In this paper in depth research has been conducted about the radial distortion and the methods of its identification and elimination. Specifically, it has been attempted to evaluate software as the aforementioned, about its effectiveness, accuracy and applicability on the elimination of the radial distortion from images. For the attainment of the desired aim, four different methods of comparison and evaluation of the performance of the software, with respect to the correction of an image, have been employed. The applied methods are (i) the optical evaluation of the produced digital images, (ii) the subtraction of the images, (iii) the comparison of the curves of the remaining radial distortion in the images and (iv) the comparison of the results from the orientation of an image pair. However, it was really important to have a benchmark for the evaluation, in order to ensure the objectivity and accuracy of the comparison. Therefore, a new reliable algorithm has been developed, which was of known and controllable accuracy. The results of these comparisons are presented and evaluated for their reliability and usefulness.

  14. A survey of radial methods for information visualization.

    Science.gov (United States)

    Draper, Geoffrey M; Livnat, Yarden; Riesenfeld, Richard F

    2009-01-01

    Radial visualization, or the practice of displaying data in a circular or elliptical pattern, is an increasingly common technique in information visualization research. In spite of its prevalence, little work has been done to study this visualization paradigm as a methodology in its own right. We provide a historical review of radial visualization, tracing it to its roots in centuries-old statistical graphics. We then identify the types of problem domains to which modern radial visualization techniques have been applied. A taxonomy for radial visualization is proposed in the form of seven design patterns encompassing nearly all recent works in this area. From an analysis of these patterns, we distill a series of design considerations that system builders can use to create new visualizations that address aspects of the design space that have not yet been explored. It is hoped that our taxonomy will provide a framework for facilitating discourse among researchers and stimulate the development of additional theories and systems involving radial visualization as a distinct design metaphor.

  15. A Review Article: Diagnosis and Treatment of Radial Tunnel Syndrome

    Directory of Open Access Journals (Sweden)

    Ebrahimzadeh Mohammad Hosein

    2015-04-01

    Full Text Available  Radial tunnel syndrome is a disease which we should consider it in elbow and forearm pains. It is diagnosed with lateral elbow and dorsal forearm pain may radiate to the wrist and dorsum of fingers. The disease is more prevalent in women with the age of 30 to 50 years old. It occurs by intermittent compression on the radial nerve from the radial head to the inferior border of the supinator muscle, without obvious extensor muscle weakness. Compression could happen in five different sites but the arcade of Frose is the most common area that radial nerve is compressed. To diagnosis radial tunnel syndrome, clinical examination is more important than paraclinic tests such as electrodiagnsic test and imaging studies. The exact site of the pain which can more specified by rule of nine test and weakness of the third finger and wrist extension are valuable physical exams to diagnosis. MRI studies my show u muscle edema or atrophy along the distribution of the posterior interosseous nerve. Although non-surgical treatments such as rest, NSAIDs, injections and physiotherapy do not believe to have permanent relief, but it is justify undergoing them before surgery. Surgery could diminish pain and symptoms in 67 to 93 percents of patients completely.

  16. Radial Fingering in a Porous Medium Digitation radiale dans un milieu poreux

    Directory of Open Access Journals (Sweden)

    Ni W.

    2006-11-01

    Full Text Available The theory of immiscible radial displacement in a Hele-Shaw cell is extended to the case of a porous medium contained between two closely-spaced parallel plates, and experiments are described for the displacement of glycerine by paraffin oil in such a system. Data are presented for the number of fingers, the breakthrough time, and the glycerine recovery, for a range of flowrates varying through three orders of magnitude. Good agreement between theory and experiment is observed. La théorie s'appliquant aux déplacements radiaux dans les cellules Hele-Shaw a été étendue à un système qui consiste en une couche mince de milieux poreux encapsulée entre deux plaques en verre. Dans cet article, on examine les déplacements de la glycérine par de l'huile de paraffine. En faisant varier le débit de l'huile de paraffine dans un intervalle de trois ordres de grandeur, on a étudié les variables telles que le nombre de digitations, le temps de percée et le taux de récupération de la glycérine. On a observé un bon accord entre la théorie et les résultats expérimentaux.

  17. Starspot-induced radial velocity jitter during a stellar cycle

    DEFF Research Database (Denmark)

    Korhonen, Heidi Helena; Andersen, Jan Marie; Järvinen, Silva

    2012-01-01

    on the Sun and other cool stars changes cyclically during an activity cycle, which has length varying from about a year to longer than the solar 11 years. In this work we investigate the influence of varying amount of starspots on the sparsely sampled radial velocity observations - which are the norm......Late-type stars exhibit cool regions on their surface, the stellar equivalent of sunspots. These dark starspots can also mimic the radial velocity variations caused by orbiting planets, making it at times difficult to distinguish between planets and activity signatures. The amount of spots...... in the radial velocity studies searching for exoplanets on wide orbits. We study two simulated cases: one with a random spot configuration, and one where the spot occurrence is concentrated. In addition we use Doppler images of young solar analogue V889 Her as a high activity case....

  18. Optimal design of radial Bragg cavities and lasers.

    Science.gov (United States)

    Ben-Bassat, Eyal; Scheuer, Jacob

    2015-07-01

    We present a new and optimal design approach for obtaining maximal confinement of the field in radial Bragg cavities and lasers for TM polarization. The presented approach outperforms substantially the previously employed periodic and semi-periodic design schemes of such lasers. We show that in order to obtain maximal confinement, it is essential to consider the complete reflection properties (amplitude and phase) of the propagating radial waves at the interfaces between Bragg layers. When these properties are taken into account, we find that it is necessary to introduce a wider ("half-wavelength") layer at a specific radius in the "quarter-wavelength" radial Bragg stack. It is shown that this radius corresponds to the cylindrical equivalent of Brewster's angle. The confinement and field profile are calculated numerically by means of transfer matrix method.

  19. Cloaking by shells with radially inhomogeneous anisotropic permittivity.

    Science.gov (United States)

    Reshetnyak, V Yu; Pinkevych, I P; Sluckin, T J; Evans, D R

    2016-01-25

    We model electromagnetic cloaking of a spherical or cylindrical nanoparticle enclosed by an optically anisotropic and optically inhomogeneous symmetric shell, by examining its electric response in a quasi-static uniform electric field. When the components of the shell permittivity are radially anisotropic and power-law dependent (ε~r(m)) whereris distance to the shell center, and m a positive or negative exponent which can be varied), the problem is analytically tractable. Formulas are calculated for the degree of cloaking in the general case, allowing the determination of a dielectric condition for the shells to be used as an invisibility cloak. Ideal cloaking is known to require that homogeneous shells exhibit an infinite ratio of tangential and radial components of the shell permittivity, but for radially inhomogeneous shells ideal cloaking can occur even for finite values of this ratio.

  20. Radial asymptotics of Lemaitre-Tolman-Bondi dust models

    CERN Document Server

    Sussman, Roberto A

    2010-01-01

    We examine the radial asymptotic behavior of spherically symmetric Lemaitre-Tolman-Bondi dust models by looking at their covariant scalars along radial rays, which are spacelike geodesics parametrized by proper length $\\ell$, orthogonal to the 4-velocity and to the orbits of SO(3). By introducing quasi-local scalars defined as integral functions along the rays, we obtain a complete and covariant representation of the models, leading to an initial value parametrization in which all scalars can be given by scaling laws depending on two metric scale factors and two basic initial value functions. Considering regular "open" LTB models whose space slices allow for a diverging $\\ell$, we provide the conditions on the radial coordinate so that its asymptotic limit corresponds to the limit as $\\ell\\to\\infty$. The "asymptotic state" is then defined as this limit, together with asymptotic series expansion around it, evaluated for all metric functions, covariant scalars (local and quasi-local) and their fluctuations. By ...

  1. Psychiatric behaviors associated with cytoskeletal defects in radial neuronal migration.

    Science.gov (United States)

    Fukuda, Toshifumi; Yanagi, Shigeru

    2017-10-01

    Normal development of the cerebral cortex is an important process for higher brain functions, such as language, and cognitive and social functions. Psychiatric disorders, such as schizophrenia and autism, are thought to develop owing to various dysfunctions occurring during the development of the cerebral cortex. Radial neuronal migration in the embryonic cerebral cortex is a complex process, which is achieved by strict control of cytoskeletal dynamics, and impairments in this process are suggested to cause various psychiatric disorders. Our recent findings indicate that radial neuronal migration as well as psychiatric behaviors is rescued by controlling microtubule stability during the embryonic stage. In this review, we outline the relationship between psychiatric disorders, such as schizophrenia and autism, and radial neuronal migration in the cerebral cortex by focusing on the cytoskeleton and centrosomes. New treatment strategies for psychiatric disorders will be discussed.

  2. Effects of spatiotopic factors on bisection of radial lines.

    Science.gov (United States)

    Chieffi, Sergio; Iavarone, Alessandro; Carlomagno, Sergio

    2008-07-01

    Under visual guidance normal subjects usually misbisect radial lines farther than the true midpoint (distal bias). We investigated whether this distal bias is constant across the peripersonal space or it varies by varying the distance of the stimulus from the subject. Subjects were asked to bisect radial lines presented below eye level either in the near or far peripersonal space. The results showed an increase of distal bias in the far-space. This finding suggests that the influence of spatial factors on bisection of radial lines is not constant across the peripersonal space. Distal bias increases as a function of the distance of the stimulus from the subject, according to a spatiotopic processing scheme.

  3. Haematoma block in reduction of distal radial fractures.

    Science.gov (United States)

    Ogunlade, S O; Omololu, A B; Alonge, T O; Salawu, S A; Bamgboye, E A

    2002-01-01

    A total of 35 patients who presented in the Accident and Emergency Department of University College Hospital with displaced distal radial fracture between January 2000 and March 2001 had reduction of the fracture under haematoma block using 10ml of 2% lignocaine. There was significant reduction of the pain following infiltration of the fracture site with lignocaine and significant pain reduction during manipulation compared to pain score at presentation. All the patients had satisfactory reduction of the fracture. The fracture was mobilised in Plaster of Paris 6 weeks in patients with Collens' fracture and 3 weeks in patients with distal radial epiphyseal injury. All patients had good range of movement at 8 weeks after removal of Plaster of Paris and patients expressed satisfaction with this method. We recommend the use of Haematoma block for patients of 15 years and above with displaced distal radial fracture in the Accident and Emergency Department.

  4. Acoustic resonances in two dimensional radial sonic crystals shells

    CERN Document Server

    Torrent, Daniel

    2010-01-01

    Radial sonic crystals (RSC) are fluidlike structures infinitely periodic along the radial direction. They have been recently introduced and are only possible thanks to the anisotropy of specially designed acoustic metamaterials [see Phys. Rev. Lett. {\\bf 103} 064301 (2009)]. We present here a comprehensive analysis of two-dimensional RSC shells, which consist of a cavity defect centered at the origin of the crystal and a finite thickness crystal shell surrounded by a fluidlike background. We develop analytic expressions demonstrating that, like for other type of crystals (photonic or phononic) with defects, these shells contain Fabry-Perot like resonances and strongly localized modes. The results are completely general and can be extended to three dimensional acoustic structures and to their photonic counterparts, the radial photonic crystals.

  5. Radial correlation length across magnetic islands: Simulations and experiments

    Science.gov (United States)

    Fernández-Marina, F.; Estrada, T.; Blanco, E.; García, L.

    2017-07-01

    The turbulence radial correlation length Lr of density fluctuations is studied across magnetic islands both numerically and experimentally. The numerical study has been carried out by a resistive MHD code (called FAR). It shows asymmetric Lr profiles when measured across magnetic islands. Subsequent simulations using a synthetic Doppler reflectometer suggest that this diagnostic has the capability to capture the effect observed in the results provided by FAR. Finally, experimental studies performed using the Doppler reflectometer installed at the TJ-II stellarator show asymmetries in the coherence profiles matching the radial position of magnetic islands. The similarities found between simulations and experiments indicate that radial correlation length measurements could be used to detect magnetic islands in fusion plasmas.

  6. Event-Specific Quantification of Radiation Belt Radial Diffusion

    Science.gov (United States)

    Tu, W.; Sarris, T. E.; Ozeke, L.

    2016-12-01

    Recently, there has been a great emphasis on developing event-specific inputs for radiation belt models, since they are proven critical for reproducing the observed radiation belt dynamics during strong events. For example, our DREAM3D simulation of the 8-9 October 2012 storm demonstrates that event-specific chorus wave model and seed population are critical to reproduce the strong enhancement of MeV electrons in this event. However, the observed fast electron dropout preceding the enhancement was not captured by the simulation, which could be due to the combined effects of fast outward radial diffusion of radiation belt electrons with magnetopause shadowing and enhanced electron precipitation. Without an event-specific quantification of radial diffusion, we cannot resolve the relative contribution of outward radial diffusion and precipitation to the observed electron dropout or realistically reproduce the dynamics during the event. In this work, we provide physical quantification of radial diffusion specific to the October 2012 event by including both real-time and global distributions of ULF waves from a constellation of wave measurements and event-specific estimation of ULF wave mode structure. The global maps of ULF waves during the event are constructed by combining the real-time measurements from the Van Allen Probes, THEMIS, and GOES satellites in space and a large array of ground magnetometers. The real-time ULF wave mode structure is then estimated using the new Cross-Wavelet Transform technique, applied to various azimuthally aligned pairs of ULF wave measurements that are located at the same L shells. The cross power and phase differences between the time series are calculated using the technique, based on which the wave power per mode number is estimated. Finally, the physically estimated radial diffusion coefficients specific to the event are applied to the DREAM3D model to quantify the relative contribution of radial diffusion to the electron dynamics

  7. Three Cases of Radial Nerve Palsy with Bee Venom Therapy

    Directory of Open Access Journals (Sweden)

    Kim Hyo-Soo

    2004-06-01

    Full Text Available Objectives : The purpose of this study is to report the efficiency of Bee Venom Therapy by managering of radial nerve palsy patients. Methods : Three patients were treatmented by Bee Venom therapy and acupucture therapy. And We took pictures of someone's wrist and checked the power of muscles by the improving phase. Results : Almost cases shows the improvement in the movement of wrist and the numbness of hand. By using acuputure and Bee Venom therapy, the symptoms of radial nerv palsy was more fastly recovered.

  8. Large dynamic range optical metrology with radial shearing interferometry

    Science.gov (United States)

    Li, Dahai; Qi, Xiaoping; Cao, Yiping; Zhou, Xin; Wang, Qionghua

    2009-05-01

    Optical metrology for elements with large dynamic range is very important, especially in aspheric components testing field. Cyclic radial shearing interferometer(CRSI) with a small radial shearing ratio of the expanded wavefront's radii to the contracted version's radii can obtain a small magnitude optical path difference(OPD) because the expanded wavefront and its contracted version nearly have the same shape and magnitude, especially for an optical component to be tested with rotationally symmetric surface. The number of fringe pattern can be decreased dramatically and recorded by CCD. This paper demonstrates the feasibility that CRSI could be used to measure an aspheric surface with large dynamic range and large aperture.

  9. Inside-Out Repair for Radial Meniscus Tears.

    Science.gov (United States)

    Pareek, Ayoosh; O'Malley, Michael P; Levy, Bruce A; Stuart, Michael J; Krych, Aaron J

    2016-08-01

    Understanding of meniscal function through basic science, natural history, and biomechanics has highlighted the importance of preserving the meniscus to maintain normal knee biomechanics. Tears that may alter these biomechanics can contribute to the progressive nature of degenerative joint disease in the knee. Radial tears result in the disruption of the circumferential fibers causing inability of the native meniscus to resist normal hoop stresses, thereby leading to increased focal areas of pressure that cause complications such as early onset arthrosis. In this technical note, we describe our preferred operative technique to repair radial meniscal tears using an arthroscopic inside-out approach with satisfactory clinical outcomes and healing response.

  10. Gas dynamics of a supersonic radial jet. Part I

    Science.gov (United States)

    Kosarev, V. F.; Klinkov, S. V.; Zaikovskii, V. N.; Kundasev, S. G.

    2015-11-01

    The gas dynamics of a supersonic radial jet was studied under conditions close to cold spraying. The jet visualization was performed for exhaustion into submerged space with atmospheric pressure and jet impingement to a target. For the cases of swirled and unswirled supersonic radial jets, the pressure profiles measured by a Pitot tube were taken for different distances from the nozzle outlet and for different widths of supersonic part δ ex = 0.5-2 mm and for prechamber pressure in the range p 0 = 1-2.5 MPa.

  11. Radial multipliers on amalgamated free products of II-factors

    DEFF Research Database (Denmark)

    Möller, Sören

    2014-01-01

    Let ℳi be a family of II1-factors, containing a common II1-subfactor 풩, such that [ℳi : 풩] ∈ ℕ0 for all i. Furthermore, let ϕ: ℕ0 → ℂ. We show that if a Hankel matrix related to ϕ is trace-class, then there exists a unique completely bounded map Mϕ on the amalgamated free product of the ℳi...... with amalgamation over 풩, which acts as a radial multiplier. Hereby, we extend a result of Haagerup and the author for radial multipliers on reduced free products of unital C*- and von Neumann algebras....

  12. The radial approach to the wrist with styloidectomy: A cadaver study.

    Science.gov (United States)

    Lecoq, F-A; Sébilo, A; Bellemère, P

    2017-09-01

    The radial approach to the wrist is already used in several surgical techniques such as radial styloidectomy and Zaidemberg's vascularized radial graft. The aim of our work was to describe the surgical anatomy of that approach and to determine the acceptable limits of radial oblique styloidectomy that does not damage the anterior and posterior radiocarpal ligaments. This radial approach was performed on 11 cadaver specimens. The superficial branches of the radial nerve and the antebrachial cephalic vein were carefully located in the superficial plane. The radiocarpal articular capsule was opened longitudinally between the first and second compartments of the extensor tendons. We drew the oblique radial styloidectomy line at 3, 6 and 9mm from the apex of radial styloid process on the articular surface and then measured the width of ligaments theoretically taken away by the styloidectomy. An oblique radial styloidectomy of less than 6mm preserved the anterior and posterior radiocarpal ligaments. There was one case of radial artery damage while opening the joint capsule. The radial approach to the wrist as described in this work provided good access to the radial styloid process, the radioscaphoid joint and the proximal pole of the scaphoid, if the approach is done carefully to preserve the superficial branches of the radial nerve, the antebrachial cephalic vein and the radial artery. Radial styloidectomy can be performed up to 6mm from the apex without significantly damaging the radiocarpal ligaments, particularly the volar ones. Copyright © 2017 SFCM. Published by Elsevier Masson SAS. All rights reserved.

  13. A Novel Integrated Structure with a Radial Displacement Sensor and a Permanent Magnet Biased Radial Magnetic Bearing

    Directory of Open Access Journals (Sweden)

    Jinji Sun

    2014-01-01

    Full Text Available In this paper, a novel integrated structure is proposed in order to reduce the axial length of the high speed of a magnetically suspended motor (HSMSM to ensure the maximum speed, which combines radial displacement sensor probes and the permanent magnet biased radial magnetic bearing in HSMSM. The sensor probes are integrated in the magnetic bearing, and the sensor preamplifiers are placed in the control system of the HSMSM, separate from the sensor probes. The proposed integrated structure can save space in HSMSMs, improve the working frequency, reduce the influence of temperature on the sensor circuit, and improve the stability of HSMSMs.

  14. A novel integrated structure with a radial displacement sensor and a permanent magnet biased radial magnetic bearing.

    Science.gov (United States)

    Sun, Jinji; Zhang, Yin

    2014-01-24

    In this paper, a novel integrated structure is proposed in order to reduce the axial length of the high speed of a magnetically suspended motor (HSMSM) to ensure the maximum speed, which combines radial displacement sensor probes and the permanent magnet biased radial magnetic bearing in HSMSM. The sensor probes are integrated in the magnetic bearing, and the sensor preamplifiers are placed in the control system of the HSMSM, separate from the sensor probes. The proposed integrated structure can save space in HSMSMs, improve the working frequency, reduce the influence of temperature on the sensor circuit, and improve the stability of HSMSMs.

  15. The Radial Velocity Experiment (RAVE): Fifth Data Release

    NARCIS (Netherlands)

    Kunder, Andrea; Kordopatis, Georges; Steinmetz, Matthias; Zwitter, Tomaž; McMillan, Paul J.; Casagrande, Luca; Enke, Harry; Wojno, Jennifer; Valentini, Marica; Chiappini, Cristina; Matijevič, Gal; Siviero, Alessandro; de Laverny, Patrick; Recio-Blanco, Alejandra; Bijaoui, Albert; Wyse, Rosemary F. G.; Binney, James; Grebel, E. K.; Helmi, Amina; Jofre, Paula; Antoja, Teresa; Gilmore, Gerard; Siebert, Arnaud; Famaey, Benoit; Bienaymé, Olivier; Gibson, Brad K.; Freeman, Kenneth C.; Navarro, Julio F.; Munari, Ulisse; Seabroke, George; Anguiano, Borja; Žerjal, Maruša; Minchev, Ivan; Reid, Warren; Bland-Hawthorn, Joss; Kos, Janez; Sharma, Sanjib; Watson, Fred; Parker, Quentin A.; Scholz, Ralf-Dieter; Burton, Donna; Cass, Paul; Hartley, Malcolm; Fiegert, Kristin; Stupar, Milorad; Ritter, Andreas; Hawkins, Keith; Gerhard, Ortwin; Chaplin, W. J.; Davies, G. R.; Elsworth, Y. P.; Lund, M. N.; Miglio, A.; Mosser, B.

    2017-01-01

    Data Release 5 (DR5) of the Radial Velocity Experiment (RAVE) is the fifth data release from a magnitude-limited (9

  16. Radial Matrix Elements of Hydrogen Atom and the Correspondence ...

    Indian Academy of Sciences (India)

    Radial dipole matrix elements having astrophysical importance have been computed for highly excited states of hydrogen atom. Computation is based on Heisenberg's form of correspondence principle for Coulomb potential. Particular attention has been paid to the choice of classical analogue (c) of principal quantum ...

  17. Development and Testing of a Radial Halbach Magnetic Bearing

    Science.gov (United States)

    Eichenberg, Dennis J.; Gallo, Christopher A.; Thompson, William K.

    2006-01-01

    The NASA John H. Glenn Research Center has developed and tested a revolutionary Radial Halbach Magnetic Bearing. The objective of this work is to develop a viable non-contact magnetic bearing utilizing Halbach arrays for all-electric flight, and many other applications. This concept will help reduce harmful emissions, reduce the Nation s dependence on fossil fuels and mitigate many of the concerns and limitations encountered in conventional axial bearings such as bearing wear, leaks, seals and friction loss. The Radial Halbach Magnetic Bearing is inherently stable and requires no active feedback control system or superconductivity as required in many magnetic bearing designs. The Radial Halbach Magnetic Bearing is useful for very high speed applications including turbines, instrumentation, medical applications, manufacturing equipment, and space power systems such as flywheels. Magnetic fields suspend and support a rotor assembly within a stator. Advanced technologies developed for particle accelerators, and currently under development for maglev trains and rocket launchers, served as the basis for this application. Experimental hardware was successfully designed and developed to validate the basic principles and analyses. The report concludes that the implementation of Radial Halbach Magnetic Bearings can provide significant improvements in rotational system performance and reliability.

  18. Drying and radial shrinkage characteristics and changes in color ...

    African Journals Online (AJOL)

    Drying and radial shrinkage characteristics and changes in color and shape of carrots tissues during air drying were studied. Slices dimensions were obtained by computer vision and the color was quantified by chroma, hue, whitening index and total carotenoids contents. The drying time became shorter of 1 h when ...

  19. Stability of drift-wave eigenmodes with arbitrary radial wavelengths

    Energy Technology Data Exchange (ETDEWEB)

    Lee, Y.C.; Chen, L.; Nevins, W.M.

    1979-05-01

    A general theory for the stability of collisionless drift-wave eigenmodes in sheared slab magnetic fields is developed using the S-matrix technique. The eigenmodes are described with the integral formulation which fully takes into account the nonlocal effects of finite ion gyro-orbits. The universal eigenmode is then shown to be absolutely stable for arbitrary radial wavelengths.

  20. Osteoid osteoma of the radial styloid mimicking de quervain tenosynovitis.

    Science.gov (United States)

    Chloros, George D; Themistocleous, George S; Papagelopoulos, Panayiotis J; Khaldi, Lubna; Efstathopoulos, Dimitrios G; Soucacos, Panayotis N

    2007-10-01

    A very unusual location of osteoid osteoma arising in the radial styloid is presented, which strongly mimicked de Quervain tenosynovitis, thereby resulting in the patient undergoing an additional unnecessary operation and a substantial delay of more than 2 years in diagnosis.

  1. Reconstruction of scalp defects with the radial forearm free flap

    Science.gov (United States)

    2012-01-01

    Background Advanced and recurrent cutaneous squamous cell carcinoma of the scalp and forehead require aggressive surgical excision often resulting in complex defects requiring reconstruction. This study evaluates various microvascular free flap reconstructions in this patient population, including the rarely utilized radial forearm free flap. Patients and methods A retrospective review of patients undergoing free flap surgeries (n = 47) of the scalp between 1997 and 2011 were included. Patients were divided primarily into two cohorts: a new primary lesion (n = 21) or recurrence (n = 26). Factors examined include patient demographics, indication for surgery, defect, type of flap used, complications (major and minor), and outcomes. Results The patients were primarily male (n = 34), with a mean age of 67 years (25–91). A total of 58 microvascular free flap reconstructions were performed (radial forearm free flap: n = 28, latissimus dorsi: n = 20, rectus abdominis: n = 9, scapula: n = 1). Following reconstruction with a radial forearm free flap, duration of hospitalization was shorter (P = 0.04) and complications rates were similar (P = 0.46). Donor site selection correlated with defect area (P scalp are aggressive and challenging to treat. The radial forearm free flap is an underutilized free flap in the reconstruction of complex scalp defects. PMID:22583845

  2. Nodal prices determination with wind integration for radial ...

    African Journals Online (AJOL)

    Like transmission pricing, distribution network pricing must also be transparent and must include tile variations based on the change in the operating state of the system, integration of renewable sources and must be real time. In this paper, a distribution system nodal pricing scheme is proposed for radial distribution system ...

  3. Sensitivity of tropical cyclone characteristics to the radial distribution ...

    Indian Academy of Sciences (India)

    Sea Surface Temperature (SST) is crucial for the development and maintenance of a tropical cyclone. (TC) particularly below the storm core region. However, storm data below the core region is the most difficult to obtain, hence it is not clear yet that how sensitive the radial distribution of the SST impact the storm ...

  4. Efficient simulation of periodically forced reactors with radial gradients

    NARCIS (Netherlands)

    van de Rotten, Bart A.; Verduyn Lunel, Sjoerd M.; Bliek, A.

    2006-01-01

    The aim of this paper is to present a limited memory iterative method, called the Broyden Rank Reduction method, to simulate periodically forced processes in plug-flow reactors with radial gradients taken into account. The simulation of periodically forced processes in plug-flow reactors leads to

  5. Radial forcing and Edgar Allan Poe's lengthening pendulum

    Science.gov (United States)

    McMillan, Matthew; Blasing, David; Whitney, Heather M.

    2013-09-01

    Inspired by Edgar Allan Poe's The Pit and the Pendulum, we investigate a radially driven, lengthening pendulum. We first show that increasing the length of an undriven pendulum at a uniform rate does not amplify the oscillations in a manner consistent with the behavior of the scythe in Poe's story. We discuss parametric amplification and the transfer of energy (through the parameter of the pendulum's length) to the oscillating part of the system. In this manner, radial driving can easily and intuitively be understood, and the fundamental concept applied in many other areas. We propose and show by a numerical model that appropriately timed radial forcing can increase the oscillation amplitude in a manner consistent with Poe's story. Our analysis contributes a computational exploration of the complex harmonic motion that can result from radially driving a pendulum and sheds light on a mechanism by which oscillations can be amplified parametrically. These insights should prove especially valuable in the undergraduate physics classroom, where investigations into pendulums and oscillations are commonplace.

  6. Radial Matrix Elements of Hydrogen Atom and the Correspondence ...

    Indian Academy of Sciences (India)

    R. Narasimhan (Krishtel eMaging) 1461 1996 Oct 15 13:05:22

    Abstract. Radial dipole matrix elements having astrophysical impor- tance have been computed for highly excited states of hydrogen atom. Computation is based on Heisenberg's form of correspondence principle for Coulomb potential. Particular attention has been paid to the choice of classical analogue (nc) of principal ...

  7. Radial Artery Approach to Salvage Nonmaturing Radiocephalic Arteriovenous Fistulas

    Energy Technology Data Exchange (ETDEWEB)

    Hsieh, Mu-Yang; Lin, Lin; Tsai, Kuei-Chin; Wu, Chih-Cheng, E-mail: chihchengwumd@gmail.com [National Taiwan University Hospital, Department of Cardiology (China)

    2013-08-01

    PurposeTo evaluate the usefulness of an approach through the radial artery distal to the arteriovenous anastomosis for salvaging nonmaturing radiocephalic arteriovenous fistulas.MethodsProcedures that fulfilled the following criteria were retrospectively reviewed: (1) autogenous radiocephalic fistulas, (2) fistulas less than 3 months old, (3) distal radial artery approach for salvage. From 2005 to 2011, a total of 51 patients fulfilling the above criteria were enrolled. Outcome variables were obtained from angiographic, clinical and hemodialysis records, including the success, complication, and primary and secondary patency rates.ResultsThe overall anatomical and clinical success rates for the distal radial artery approach were 96 and 94 %, respectively. The average procedure time was 36 {+-} 19 min. Six patients (12 %) experienced minor complications as a result of extravasations. No arterial complication or puncture site complication was noted. The postinterventional 6-month primary patency rate was 51 %, and the 6-month secondary patency rate was 90 %. When the patients were divided into a stenosed group (20 patients) and an occluded group (31 patients), there were no differences in the success rate, complication rate, or primary and secondary patency rates.ConclusionAn approach through the radial artery distal to the arteriovenous anastomosis is an effective and safe alternative for the salvage of nonmaturing radiocephalic arteriovenous fistulas, even for occluded fistulas.

  8. Application of radial basis neural network for state estimation of ...

    African Journals Online (AJOL)

    user

    An original application of radial basis function (RBF) neural network for power system state estimation is proposed in this paper. The property of massive parallelism of neural networks is employed for this. The application of RBF neural network for state estimation is investigated by testing its applicability on a IEEE 14 bus ...

  9. Radial basis function neural network in fault detection of automotive ...

    African Journals Online (AJOL)

    Radial basis function neural network in fault detection of automotive engines. Adnan Hamad, Dingli Yu, JB Gomm, Mahavir S Sangha. Abstract. Fault detection and isolation have become one of the most important aspects of automobile design. A fault detection (FD) scheme is developed for automotive engines in this paper.

  10. The star formation history of CALIFA galaxies: Radial structures

    NARCIS (Netherlands)

    González Delgado, R. M.; Pérez, E.; Cid Fernandes, R.; García-Benito, R.; de Amorim, A. L.; Sánchez, S. F.; Husemann, B.; Cortijo-Ferrero, C.; López Fernández, R.; Sánchez-Blázquez, P.; Bekeraite, S.; Walcher, C. J.; Falcón-Barroso, J.; Gallazzi, A.; van de Ven, G.; Alves, J.; Bland-Hawthorn, J.; Kennicutt, R. C.; Kupko, D.; Lyubenova, M.; Mast, D.; Mollá, M.; Marino, R. A.; Quirrenbach, A.; Vílchez, J. M.; Wisotzki, L.

    We have studied the radial structure of the stellar mass surface density (μ∗) and stellar population age as a function of the total stellar mass and morphology for a sample of 107 galaxies from the CALIFA survey. We applied the fossil record method based on spectral synthesis techniques to recover

  11. Radial oscillations of neutron stars in strong magnetic fields

    Indian Academy of Sciences (India)

    Abstract. The eigen frequencies of radial pulsations of neutron stars are calculated in a strong magnetic field. At low densities we use the magnetic BPS equation of state (EOS) similar to that obtained by Lai and Shapiro while at high densities the EOS obtained from the relativistic nuclear mean field theory is taken and ...

  12. Radial extracorporeal shock wave treatment harms developing chicken embryos

    Science.gov (United States)

    Kiessling, Maren C.; Milz, Stefan; Frank, Hans-Georg; Korbel, Rüdiger; Schmitz, Christoph

    2015-01-01

    Radial extracorporeal shock wave treatment (rESWT) has became one of the best investigated treatment modalities for cellulite, including the abdomen as a treatment site. Notably, pregnancy is considered a contraindication for rESWT, and concerns have been raised about possible harm to the embryo when a woman treated with rESWT for cellulite is not aware of her pregnancy. Here we tested the hypothesis that rESWT may cause serious physical harm to embryos. To this end, chicken embryos were exposed in ovo to various doses of radial shock waves on either day 3 or day 4 of development, resembling the developmental stage of four- to six-week-old human embryos. We found a dose-dependent increase in the number of embryos that died after radial shock wave exposure on either day 3 or day 4 of development. Among the embryos that survived the shock wave exposure a few showed severe congenital defects such as missing eyes. Evidently, our data cannot directly be used to draw conclusions about potential harm to the embryo of a pregnant woman treated for cellulite with rESWT. However, to avoid any risks we strongly recommend applying radial shock waves in the treatment of cellulite only if a pregnancy is ruled out. PMID:25655309

  13. Non Radial Oscillations in an Axisymmetric MHD Incompressible Fluid

    Indian Academy of Sciences (India)

    tribpo

    Abstract. It is well known from Helioseismology that the Sun exhibits oscillations on a global scale, most of which are non radial in nature. These oscillations help us to get a clear picture of the internal structure of the Sun as has been demonstrated by the theoretical and observational. (such as GONG) studies. In this study ...

  14. Radial oscillations of neutron stars in strong magnetic fields

    Indian Academy of Sciences (India)

    The eigen frequencies of radial pulsations of neutron stars are calculated in a strong magnetic field. At low densities we use the magnetic BPS equation of state (EOS) similar to that obtained by Lai and Shapiro while at high densities the EOS obtained from the relativistic nuclear mean field theory is taken and extended to ...

  15. Clinicians' recognition of 10 different types of distal radial fractures

    NARCIS (Netherlands)

    Oskam, J; Kingma, J; Klasen, HJ

    2000-01-01

    This study concerned baseline performance in recognition of 10 different types of distal radial fractures. Verbal tasks of admitting knowing about fractures and Visual tasks were designed for each fracture type. The Verbal task of admitting knowing consisted of a description with the relevant

  16. Mason Type I Fractures of the Radial Head

    NARCIS (Netherlands)

    de Muinck Keizer, Robert-Jan O.; Walenkamp, Monique M. J.; Goslings, J. Carel; Schep, Niels W. L.

    2015-01-01

    Mason type I fractures are the most common fractures of the radial head. The fractures have a benign character and often result in good, pain-free function. Nevertheless, up to 20% of patients with a Mason type I fracture report loss of extension and residual pain. Currently, there is a lack of

  17. Clinical Presentation, Surgical Treatment, and Outcome in Radial Polydactyly.

    Science.gov (United States)

    Dijkman, R R; van Nieuwenhoven, C A; Hovius, S E R; Hülsemann, W

    2016-02-01

    Radial polydactyly or 'thumb duplication' is the most common congenital upper limb anomaly ('CULA') affecting the thumb. The clinical presentation is highly diverse, ranging from an extra thumb floating on a skin bridge to complicated thumb triplications with triphalangeal, deviating, and hypoplastic components. Radial polydactyly can be classified into one of 7 osseous presentations using the Wassel classification, with type IV (45%), type II (20%), and type VII (15%) occurring most frequently. When faced with a radial polydactyly case, hand surgeons specialised in congenital anomalies must weigh the preoperative functional potential and degree of hypoplasia of both thumbs in order to decide whether to resect one thumb and reconstruct the other ('resection and reconstruction'), excise a central part of both thumbs and unite the lateral tissues into one thumb ('the Bilhaut procedure'), transfer the better-developed distal tissues of one thumb onto the better-developed proximal tissues of the other ('on-top plasty'), or discard both severely hypoplastic thumbs and pollicise the index finger. Mere excision of the hypoplastic thumb is rarely indicated since it often requires subsequent revision surgery. Even after being treated by experienced surgeons, about 15% of patients with polydactyly will need additional procedures to correct residual and/or new problems such as deviation from the longitudinal axis and joint instability. Nevertheless, radial polydactyly patients usually achieve unimpaired everyday hand function postoperatively. © Georg Thieme Verlag KG Stuttgart · New York.

  18. Voltage regulator placement in radial distribution system using plant ...

    African Journals Online (AJOL)

    user

    Voltage regulator placement in radial distribution system using plant growth simulation algorithm. P.V.V. Rama Rao1*, S. Sivanaga Raju 2. 1*Department of Electrical & Electronics Engineering, Arjun College of Technology & Science, Hyderabad, INDIA. 2 Department of Electrical & Electronics Engineering, JNTUK College ...

  19. Radial tunnel syndrome. Findings and treatment in 17 patients

    Directory of Open Access Journals (Sweden)

    Gustavo Alberto Breglia

    2015-05-01

    Full Text Available Backround Radial tunnel syndrome is a condition secondary to the intermittent entrapment of the posterior interosseous nerve between superficial and deep mass of short supinator adjacent structures, such as vessels and fascias. The purpose of this study was to identify the anatomical structures that produce the eventual compression, to establish and communicate the differences in the subjective pain perception before and after the release of the posterior interosseous nerve in the radial tunnel. Method Between 2009 and 2014, 17 patients underwent surgical treatment by posterior interosseous nerve release. We used the approach between the first external radial and brachioradialis. Patients were assessed by visual analogue scale for pain intensity before surgery and at week 6, and according to the Roles and Maudsley functional criteria. Results The causes of posterior interosseous nerve compression were fibrous band of short supinator (arcade of Frohse (7 cases, recurrent vessels (4 cases, compression by the mass of the superficial portion of the short supinator muscle (2 cases and secondary compression by extensor carpi radialis brevis tendon (4 cases. Results were excellent (4 patients, good (10 patients and fair (3 patients. Patients treated through the Labor Risk Insurance had worse outcomes than those who were not covered by this system. Conclusions Radial tunnel syndrome is a condition that must be taken into account when there is refractory lateral epicondylalgia. This disease has a marked effect in patients with labor conflict, which may bias the outcome of treatment.

  20. [Motor replacement surgery via tendon transfer in radial nerve palsy].

    Science.gov (United States)

    Koulaxouzidis, G; Stark, G B; Lampert, F M

    2015-02-01

    Restoration of active extension of wrist, thumb and digits by muscle-tendon transposition. Radial nerve palsy due to peripheral nerve injury. Peripheral nerve disease. Muscle or tendon injury. Restoration of wrist extension in high radial nerve palsy. Reversible distal radial nerve palsy, absence of suitable donor muscles, spasticity, limited range of motion of affected joints, extensive scarring and inappropriate soft tissue conditions, unjustifiable loss of function at donor site. Reinnervated donor muscles, progressive muscle disease, insufficient patient compliance. Dissection of the flexor carpi ulnaris, palmaris longus and pronator teres tendon insertion. Transposition of the tendons. Interweaving of tendons of the pronator teres and extensor carpi radialis brevis muscles, the extensor digitorum communis and flexor carpi ulnaris muscles, as well as the extensor pollicis longus and palmaris longus muscles using the Pulvertaft technique. 3 Weeks immobilization in forearm splint. Additional immobilization for 2 weeks at night. Subsequently, intensive physical and occupational therapy for another 4-6 weeks is required, starting 3 weeks postoperatively. The procedure was carried out in 12 patients over the past 14 years. We treated proximal radial nerve palsy in nine cases. In accordance with the current medical literature, we consider the described motor replacement surgery a reliable procedure.

  1. Nodal prices determination with wind integration for radial ...

    African Journals Online (AJOL)

    In this paper, a distribution system nodal pricing scheme is proposed for radial distribution system with integration of wind power in the system. The main objective of the paper is: (i) an optimal power flow based approach for determination of nodal prices for distribution system, (ii) impact of wind generation on nodal prices.

  2. Contrast effects on speed perception for linear and radial motion.

    Science.gov (United States)

    Champion, Rebecca A; Warren, Paul A

    2017-11-01

    Speed perception is vital for safe activity in the environment. However, considerable evidence suggests that perceived speed changes as a function of stimulus contrast, with some investigators suggesting that this might have meaningful real-world consequences (e.g. driving in fog). In the present study we investigate whether the neural effects of contrast on speed perception occur at the level of local or global motion processing. To do this we examine both speed discrimination thresholds and contrast-dependent speed perception for two global motion configurations that have matched local spatio-temporal structure. Specifically we compare linear and radial configurations, the latter of which arises very commonly due to self-movement. In experiment 1 the stimuli comprised circular grating patches. In experiment 2, to match stimuli even more closely, motion was presented in multiple local Gabor patches equidistant from central fixation. Each patch contained identical linear motion but the global configuration was either consistent with linear or radial motion. In both experiments 1 and 2, discrimination thresholds and contrast-induced speed biases were similar in linear and radial conditions. These results suggest that contrast-based speed effects occur only at the level of local motion processing, irrespective of global structure. This result is interpreted in the context of previous models of speed perception and evidence suggesting differences in perceived speed of locally matched linear and radial stimuli. Copyright © 2017 Elsevier Ltd. All rights reserved.

  3. A modified harmony search based method for optimal rural radial ...

    African Journals Online (AJOL)

    In this work, a Harmony Search (HS) based optimization approach is developed to solve the radial line planning problem. Furthermore, some modifications to the HS are presented for improving the computational efficiency of optimization problems with strongly interrelated mixed variables. A sample system is served for ...

  4. Radial solutions to semilinear elliptic equations via linearized operators

    Directory of Open Access Journals (Sweden)

    Phuong Le

    2017-04-01

    Full Text Available Let $u$ be a classical solution of semilinear elliptic equations in a ball or an annulus in $\\mathbb{R}^N$ with zero Dirichlet boundary condition where the nonlinearity has a convex first derivative. In this note, we prove that if the $N$-th eigenvalue of the linearized operator at $u$ is positive, then $u$ must be radially symmetric.

  5. Radial variations of wood different properties in Diospyros lotus

    Directory of Open Access Journals (Sweden)

    Majid Kiaei

    2014-03-01

    Full Text Available Aim of study: The aim of this study was to determine some of the physical, biometry and mechanical strength properties of Diospyros lotus L. wood along radial direction from the pith to the bark and the relationship between wood various properties. Area of study: The study area is located in north Iran in the province of Mazandarn. Material and methods: Testing samples were taken at breast height of tree stem and three radial position of stem radius to determine physical (basic density, fiber biometry (fiber length, fiber diameter, cell-wall thickness and mechanical properties (modulus of rupture and modulus of elasticity.Main results: The results of ANOVA indicated that there are significant differences along radial direction in above mentioned properties for persimmon wood. Basic density, fiber length, fiber diameter, cell-wall thickness, modulus of elasticity and modulus of rupture increased along radial direction from pith toward the bark. Research highlights: The persimmon wood isn’t suitable for pulp and paper production due to the unfavorable flexibility and Runkel coefficients.Keywords: Diospyros lotus; basic density; fiber features; modulus of rupture; modulus of elasticity.

  6. Defining postoperative stability in children with radial polydactyly.

    Science.gov (United States)

    Engelhardt, T O; Djedovic, G; Pedross, F; Piza-Katzer, H

    2016-03-01

    There is little fundamental data on paediatric metacarpophalangeal joint instability in radial polydactyly following surgical reconstruction. We evaluated 27 thumbs in a healthy paediatric population (Group A: eight girls and 19 boys with a mean age of 9.7 years (range 2.7-14.2)) and 12 thumbs following Wassel-IV reconstruction (Group B: eight girls and four boys with a mean age at follow-up of 10.6 years (range 2.7-13.2)). Metacarpophalangeal joint radial deviation, ulnar deviation on stress testing, interphalangeal joint and metacarpophalangeal joint alignment on posterior-anterior radiographs were measured and scored according to parameters defining joint instability. The aim of our study was to provide fundamental data on thumb metacarpophalangeal joint mobility patterns and alignment for further postoperative evaluations in children. The average ulnar deviation and radial deviation on stress testing of the healthy (Group A) metacarpophalangeal joints was 25° (10°-45°) and 30° (10°-55°), respectively. In the operated (Group B) thumbs, the ulnar deviation and radial deviation was greater at 35° (10°-55°) and 30° (10°-70°). Ulnar deviation (UD) of the proximal phalanx at the metacarpophalangeal joint on posterior-anterior radiographs was a mean of 10° (range -10°-30°) in Group B; this was significantly greater than in Group A at a mean of 5° (range -5-20°) (p = 0.029). The mean radial alignment of the interphalangeal joint (distal phalanx relative to the proximal phalanx) was significantly higher in Group B (15°) than Group A (0°) (p = 0.221). In the literature on radial polydactyly, cut off values defining metacarpophalangeal joint instability in children range from 5° to 20°. According to our results, high but physiological metacarpophalangeal joint mobility of the thumb needs to be taken into consideration when evaluating children following reconstruction. Ulnar or radial deviation greater than 30°, in combination with the

  7. Comparison of functional outcome scores in radial polydactyly.

    Science.gov (United States)

    Dijkman, Robert R; van Nieuwenhoven, Christianne A; Selles, Ruud W; Hovius, Steven E R

    2014-03-19

    A wide range of outcome assessment systems have been used to describe the results and evaluate residual impairment after surgery for radial polydactyly. We conducted a study to determine which of these assessment systems should be considered superior for the most common types of radial polydactyly (types II and IV). Ten outcome assessment systems were selected. Three examiners independently evaluated thirty-seven patients, aged four to twenty-two years, with radial polydactyly. Patients completed two manual activity questionnaires. Interobserver reliability was determined with use of an intraclass correlation coefficient (ICC). Validity was assessed by correlating the results derived with the outcome assessment systems with functional visual analog scale (VAS), aesthetic VAS, and manual activity questionnaire scores. Thirty-seven patients (forty-one hands with radial polydactyly) were evaluated. All patients were assessed by at least two examiners. Reliability was highest for the Japanese Society for Surgery of the Hand (JSSH), Cheng et al., and Tada et al. assessment systems (overall ICCs ≥ 0.70). The JSSH system had the highest overall correlations (rs ranging from 0.48 to 0.80 and 0.45 to 0.63) with functional and aesthetic VAS scores. No significant correlations were found between the outcome scores and the results of the manual activity questionnaires after an average follow-up time of 112 months. Interobserver reliability was highest for the JSSH classification, which also showed superior correlations with both examiner-rated and patient-rated VAS scores for functional and aesthetic outcome compared with the other nine assessment systems. The finding of a poor correlation between the outcome scores and the results of manual activity questionnaires is in agreement with findings in published literature. We recommend the JSSH assessment method for the scientific evaluation of the outcomes, in terms of body structure and function, of the treatment of radial

  8. Hand function in children with radial longitudinal deficiency

    Science.gov (United States)

    2013-01-01

    Background In children with hypoplasia or aplasia of the radius (radial longitudinal deficiency) manual activity limitations may be caused by several factors; a short and bowed forearm, radial deviation of the wrist, a non-functional or absent thumb, limited range of motion in the fingers and impaired grip strength. The present study investigates the relation between these variables and activity and participation in children with radial dysplasia. Methods Twenty children, age 4–17 years, with radial longitudinal dysplasia Bayne type II-IV were examined with focus on the International Classification of Functioning and Health, version for Children and Youth (ICF-CY) context. Body function/structure was evaluated by measures of range of motion, grip strength, sensibility and radiographic parameters. Activity was examined by Box and Block Test and Assisting Hand Assessment (AHA). Participation was assessed by Children’s Hand-use Experience Questionnaire (CHEQ). Statistical correlations between assessments of body function/structure and activity as well as participation were examined. Results The mean total active motion of wrist (49.6°) and digits (447°) were less than norms. The mean hand forearm angle was 34° radially. Ulnar length ranged from 40 to 80% of age-related norms. Grip strength (mean 2.7 kg) and Box and Block Test (mean 33.8 blocks/minute) were considerably lower than for age-related norms. The mean score for the AHA was 55.9 and for CHEQ Grasp efficiency 69.3. The AHA had significant relationship with the total range of motion of digits (p = 0.042). Self-experienced time of performance (CHEQ Time) had significant relationship with total active motion of wrist (p = 0.043). Hand forearm angle did not show any significant relationship with Box and Block Test, AHA or CHEQ. Conclusion In radial longitudinal deficiency total range of motion of digits and wrist may be of more cardinal importance to the child’s activity and participation than

  9. Efficacy of radial styloid targeting screws in volar plate fixation of intra-articular distal radial fractures: a biomechanical study in a cadaver fracture model

    Directory of Open Access Journals (Sweden)

    Yamashita Toshihiko

    2010-12-01

    Full Text Available Abstract Background The locking screws target the radial styloid, theoretically provide greater stability against radial styloid fragment. However, it is unknown whether the radial styloid locking screws increased the stability of the volar plating system fixation along the entire distal radius or not. In this study, we evaluated the stability of the volar plating system fixation with or without the radial styloid screws using a biomechanical study in a cadaver fracture model. Methods Six matched pairs of fresh-frozen human cadaver wrists complete from the proximal forearm to the metacarpal bones were prepared to simulate standardized 3-part intra-articular and severe comminuted fractures. Specimens were fixed using the volar plating system with or without 2 radial styloid screws. Each specimen was loaded at a constant rate of 20 mm/min to failure. Load data was recorded and, ultimate strength and change in gap between distal and proximal fragments were measured. Data for ultimate strength and screw failure after failure loading were compared between the 2 groups. Results The average ultimate strength at failure of the volar plate fixation with radial styloid screws (913.5 ± 157.1 N was significantly higher than that without them (682.2 ± 118.6 N. After failure loading, the average change in gap between the ulnar and proximal fragment was greater than that between the radial and proximal fragment. The number of bent or broken screws in ulnar fragment was higher than that in radial fragment. The number of specimens with bent or broken screws in cases with radial styloid screws was fewer than that in the fixation without radial styloid screws group. Conclusion The ulnar fragment is more intensively stressed than the radial fragment under axial loading of distal radius at full wrist extension. The radial styloid screws were effective in stable volar plate fixation of distal radial fractures.

  10. Effects of radial diffuser hydraulic design on a double-suction centrifugal pump

    Science.gov (United States)

    Hou, H. C.; Zhang, Y. X.; Xu, C.; Zhang, J. Y.; Li, Z. L.

    2016-05-01

    In order to study effects of radial diffuser on hydraulic performance of crude oil pump, the steady CFD numerical method is applied and one large double-suction oil pump running in long-distance pipeline is considered. The research focuses on analysing the influence of its diffuser vane profile on hydraulic performance of oil pump. The four different types of cylindrical vane have been designed by in-house codes mainly including double arcs (DA), triple arcs (TA), equiangular spiral line (ES) and linear variable angle spiral line (LVS). During design process diffuser vane angles at inlet and outlet are tentatively given within a certain range and then the wrapping angle of the four types of diffuser vanes can be calculated automatically. Under the given inlet and outlet angles, the linear variable angle spiral line profile has the biggest wrapping angle and profile length which is good to delay channel diffusion but bring more friction hydraulic loss. Finally the vane camber line is thickened at the certain uniform thickness distribution and the 3D diffuser models are generated. The whole flow passage of oil pump with different types of diffusers under various flow rate conditions are numerically simulated based on RNG k-ɛ turbulent model and SIMPLEC algorithm. The numerical results show that different types of diffusers can bring about great difference on the hydraulic performance of oil pump, of which the ES profile diffuser with its proper setting angle shows the best hydraulic performance and its inner flow field is improved obviously. Compared with the head data from model sample, all designed diffusers can make a certain improvement on head characteristic. At the large flow rate conditions the hydraulic efficiency increases obviously and the best efficiency point shift to the large flow rate range. The ES profile diffuser embodies the better advantages on pump performance which can be explained theoretically that the diffuser actually acts as a diffusion

  11. Primeros resultados sobre el estudio de oscilaciones no radiales

    Science.gov (United States)

    Córsico, A.; Benvenuto, O. G.

    En el Observatorio de La Plata se ha comenzado a elaborar un código de pulsaciones el cual resuelve el problema de las oscilaciones no radiales en el caso adiabático. Dicho código está basado en la técnica de diferencias finitas ampliamente usado en cálculos de estructura y evolución estelar. En este trabajo se presentan los primeros resultados encontrados aplicando el código mencionado al caso de una polítropa de índice n=3. Se presentan los valores de las autofrecuencias y las autofunciones para diferentes modos de pulsación de dicha configuración politrópica. En un futuro próximo, se aplicará este programa al estudio de las pulsaciones no radiales de estrellas enanas blancas.

  12. Intraneural ganglion in superficial radial nerve mimics de quervain tenosynovitis.

    Science.gov (United States)

    Haller, Justin M; Potter, Michael Q; Sinclair, Micah; Hutchinson, Douglas T

    2014-11-01

    Background Intraneural ganglions in peripheral nerves of the upper extremity are extremely rare and poorly understood. Case Description We report a patient with symptoms consistent with de Quervain tenosynovitis who was found to have an intraneural ganglion in the superficial radial nerve. The ganglion did not communicate with the wrist joint. We removed the intraneural ganglion, and the patient's symptoms resolved. At her 6-month postoperative follow-up, she remained asymptomatic.  There is only one case report of intraneural ganglion in the superficial radial nerve. In that case, the patient had symptoms consistent with nerve irritation, including radiating pain and paresthesias. In contrast to that previous report, the patient in the current case had only localized pain, no paresthesias, and a physical exam consistent with de Quervain tenosynovitis. Clinical Relevance This case demonstrates that an intraneural ganglion cyst can mimic the symptoms of de Quervain tenosynovitis without the more usual presentation of painful paresthesias.

  13. Thin viscoelastic disc subjected to radial non-stationary loading

    Directory of Open Access Journals (Sweden)

    Adámek V.

    2010-07-01

    Full Text Available The investigation of non-stationary wave phenomena in isotropic viscoelastic solids using analytical approaches is the aim of this paper. Concretely, the problem of a thin homogeneous disc subjected to radial pressure load nonzero on the part of its rim is solved. The external excitation is described by the Heaviside function in time, so the nonstationary state of stress is induced in the disc. Dissipative material behaviour of solid studied is represented by the discrete material model of standard linear viscoelastic solid in the Zener configuration. After the derivation of motion equations final form, the method of integral transforms in combination with the Fourier method is used for finding the problem solution. The solving process results in the derivation of integral transforms of radial and circumferential displacement components. Finally, the type of derived functions singularities and possible methods for their inverse Laplace transform are mentioned.

  14. Transport and radial electric field in torus plasmas

    Energy Technology Data Exchange (ETDEWEB)

    Okamoto, Masao; Nakajima, Noriyoshi; Sugama, Hideo [National Inst. for Fusion Science, Toki, Gifu (Japan); Maluckov, Aleksandra A. [University of Nis, Prirodno-Matematicki Fakultet, FR (Yugoslavia); Satake, Shinsuke [Graduate University for Advanced Studies, Hayama, Kanagawa (Japan)

    2002-12-01

    Transport phenomena in torus plasmas are discussed focusing on the generation of the neoclassical radial electric field. A sophisticated {delta}f Monte Carlo particle simulation code 'FORTEC' is developed including the effect of finite orbit width (FOW), which is the non-local property of the plasma transport. It will be shown that the neoclassical radial electric field in the axisymmetric tokamak is generated due to this FOW effect. The Lagrangian approach is applied to construct a non-local transport theory in the region of near-axis. The reduction of the heat diffusivity toward the axis will be shown. From a statistical point of view, diffusion processes are studied in the presence of irregular magnetic fields. It is shown that the diffusion processes are non-local in almost all the cases if there are some irregularities in the magnetic field. (author)

  15. Activity-induced radial velocity variation of M dwarf stars

    DEFF Research Database (Denmark)

    Andersen, Jan Marie; Korhonen, Heidi Helena

    2012-01-01

    that can drown out a planetary signature. Cool, low-mass M dwarf stars can be highly active, which can make detection of potentially habitable planets around these stars difficult. We investigate radial velocity variations caused by different activity (spot) patterns on M dwarf stars in order to determine......Stellar magnetic activity manifests itself in a variety of ways including starspots-cool, dark regions on the stellar surface. Starspots can cause variations ('jitter') in spectral line-profiles which can mimic the radial velocity (RV) variations caused by an orbiting planet, or create RV noise...... the limits of detectability for small planets orbiting active M dwarfs. We report on our progress toward the aim of answering the following questions: What types of spot patterns are realistic for M dwarf stars? What effect will spots have on M dwarf RV measurements? Can jitter from M dwarf spots mimic...

  16. A New Shape Description Method Using Angular Radial Transform

    Science.gov (United States)

    Lee, Jong-Min; Kim, Whoi-Yul

    Shape is one of the primary low-level image features in content-based image retrieval. In this paper we propose a new shape description method that consists of a rotationally invariant angular radial transform descriptor (IARTD). The IARTD is a feature vector that combines the magnitude and aligned phases of the angular radial transform (ART) coefficients. A phase correction scheme is employed to produce the aligned phase so that the IARTD is invariant to rotation. The distance between two IARTDs is defined by combining differences in the magnitudes and aligned phases. In an experiment using the MPEG-7 shape dataset, the proposed method outperforms existing methods; the average BEP of the proposed method is 57.69%, while the average BEPs of the invariant Zernike moments descriptor and the traditional ART are 41.64% and 36.51%, respectively.

  17. La arteria radial en la cirugía coronaria

    Directory of Open Access Journals (Sweden)

    Manuel Calleja Hernández

    2006-10-01

    Desde agosto de 1996 hasta la actualidad hemos utilizado la arteria radial como injerto coronario en 424 pacientes. Se realizaron 543 anastomosis distales con 454 arterias radiales, lo que contribuyó a alcanzar un alto tanto por ciento de revascularización completa con conductos arteriales exclusivamente. Nuestra propia experiencia nos ha convencido de que se trata de un conducto excelente para ser usado en cirugía coronaria, en nuestra opinión el mejor tras la arteria mamaria interna izquierda. Las razones que, a nuestro juicio, avalan su uso extensivo son: su naturaleza arterial, su disponibilidad, la facilidad de su obtención con mínima morbilidad, su concordante calibre con los vasos coronarios, la importante longitud de la misma, la facilidad de su manejo quirúrgico, su resistencia al acodamiento, el hecho de evitar safenectomías, y la excelente permeabilidad demostrada ya a largo plazo.

  18. THE RADIAL VELOCITY EXPERIMENT (RAVE): FOURTH DATA RELEASE

    Energy Technology Data Exchange (ETDEWEB)

    Kordopatis, G.; Gilmore, G. [Institute of Astronomy, University of Cambridge, Madingley Road, Cambridge, CB3 0HA (United Kingdom); Steinmetz, M.; Williams, M. E. K.; Piffl, T.; Enke, H.; Carrillo, I. [Leibniz-Institut für Astrophysik Potsdam, An der Sternwarte 16, D-14482 Potsdam (Germany); Boeche, C.; Roeser, S. [Astronomisches Rechen-Institut, Zentrum für Astronomie der Universität Heidelberg, Mönchhofstr. 12-14, D-69120 Heidelberg (Germany); Seabroke, G. M. [Mullard Space Science Laboratory, University College London, Holmbury St. Mary, Dorking, Surrey, RH5 6NT (United Kingdom); Siebert, A. [Observatoire Astronomique de Strasbourg, Université de Strasbourg, CNRS, UMR 7550, 11 rue de l' Université, F-67000 Strasbourg (France); Zwitter, T. [Faculty of Mathematics and Physics, University of Ljubljana, Jadranska 19, 1000 Ljubljana (Slovenia); Binney, J. [Rudolf Peierls Centre for Theoretical Physics, Keble Road, Oxford, OX1 3NP (United Kingdom); De Laverny, P.; Recio-Blanco, A.; Bijaoui, A. [Laboratoire Lagrange, UMR 7293, Université de Nice Sophia Antipolis, CNRS, Observatoire de la Côte d' Azur, BP4229, F-06304 Nice (France); Wyse, R. F. G. [Johns Hopkins University, 3400 North Charles Street, Baltimore, MD 21218 (United States); Freeman, K. [Research School of Astronomy and Astrophysics, Australian National University, Cotter Road, Weston, ACT 2611 (Australia); Munari, U. [INAF National Institute of Astrophysics, Astronomical Institute of Padova, I-36012 Asiago (VI) (Italy); Anguiano, B., E-mail: gkordo@ast.cam.ac.uk [Australian Astronomical Observatory, P.O. Box 915, North Ryde, NSW 1670 (Australia); and others

    2013-11-01

    We present the stellar atmospheric parameters (effective temperature, surface gravity, overall metallicity), radial velocities, individual abundances, and distances determined for 425,561 stars, which constitute the fourth public data release of the RAdial Velocity Experiment (RAVE). The stellar atmospheric parameters are computed using a new pipeline, based on the algorithms of MATISSE and DEGAS. The spectral degeneracies and the Two Micron All Sky Survey photometric information are now better taken into consideration, improving the parameter determination compared to the previous RAVE data releases. The individual abundances for six elements (magnesium, aluminum, silicon, titanium, iron, and nickel) are also given, based on a special-purpose pipeline that is also improved compared to that available for the RAVE DR3 and Chemical DR1 data releases. Together with photometric information and proper motions, these data can be retrieved from the RAVE collaboration Web site and the Vizier database.

  19. Radial limitation of the focal zone of a magnetoplasma compressor

    Energy Technology Data Exchange (ETDEWEB)

    Kamrukov, A.S.; Kozlov, N.P.; Protasov, Y.S.

    1978-09-01

    An investigation was made of the radial limitation of the zone of a dense plasma focus on the dynamic, energy, and spectral characteristics of a high-current plasma-dynamic discharge. It is shown that magnetic constriction of the flow and the considerable axial component of the velocity make it possible to attain high tempertures of the plasma without danger of a breakdown, limiting the discharge of the walls, which enables the use of a radially limited discharge as a high-intensity source of radiation in the visible and near ultraviolet regions of the spectrum, with times of the increase in the intensity of a pulse of approx.1 ..mu..sec.

  20. Bilateral radial ray hypoplasia with multiple epiphyseal dysplasia.

    Science.gov (United States)

    Eddy, M C; Steiner, R D; McAlister, W H; Whyte, M P

    1998-05-18

    We describe a 5-4/12-year-old girl with the unique combination of bilateral radial ray hypoplasia and multiple epiphyseal dysplasia (MED). Radial ray hypoplasia was diagnosed at birth. MED was documented at age 4-3/12 years when she presented with leg pain and short stature and was found to have femoral anteversion and tibial torsion giving rise to severe genu valgum deformity and intoeing. She has no facial anomalies and is developmentally normal. Family history is unremarkable and chromosomal analysis was normal. Investigation of mineral metabolism showed idiopathic hypercalciuria. Surgical lengthening of her severely hypoplastic left radius at age 19 months was successful. Bilateral femoral and tibial osteotomies at age 5-4/12 years corrected her lower limb deformities. This combination of two distinctive but rare skeletal abnormalities may represent a new syndrome.

  1. Cooled variable nozzle radial turbine for rotor craft applications

    Science.gov (United States)

    Rogo, C.

    1981-01-01

    An advanced, small 2.27 kb/sec (5 lbs/sec), high temperature, variable area radial turbine was studied for a rotor craft application. Variable capacity cycles including single-shaft and free-turbine engine configurations were analyzed to define an optimum engine design configuration. Parametric optimizations were made on cooled and uncooled rotor configurations. A detailed structural and heat transfer analysis was conducted to provide a 4000-hour life HP turbine with material properties of the 1988 time frame. A pivoted vane and a moveable sidewall geometry were analyzed. Cooling and variable geometry penalties were included in the cycle analysis. A variable geometry free-turbine engine configuration with a design 1477K (2200 F) inlet temperature and a compressor pressure ratio of 16:1 was selected. An uncooled HP radial turbine rotor with a moveable sidewall nozzle showed the highest performance potential for a time weighted duty cycle.

  2. Behavior and spatial learning in radial mazes in birds.

    Science.gov (United States)

    Pleskacheva, M G

    2009-10-01

    This review addresses studies of spatial memory and learning in birds performed using the radial maze method. Descriptions of different versions of this test (standard and "giant" tunnel-type mazes, as well as unstructured "analogs") are described and the methodological problems of testing birds are discussed. Behavioral measures from birds and laboratory rats, as the "standard" system for radial maze studies, are compared. The characteristics of spatial learning in birds of different systematic groups (pigeons, tits, corvids, chickens, etc.) are compared. Particular attention is paid to studies addressing spatial memory in closely related bird species with different ecological features, in terms of the ability to hoard food and finding their hoards after prolonged time periods, as well as to the few reports of results from experiments with migrant birds and homing pigeons.

  3. Fuchs' dystrophy associated with radial keratotomy: Lamellar or perforating keratoplasty?

    Science.gov (United States)

    Rodriguez-Ausin, P; Antolin-Garcia, D; Santamaria Garcia, L; Blazquez-Fernandez, A-B

    2017-05-01

    A 70 year-old male patient with a history of radial keratotomy suffering from Fuchs' dystrophy and a cataract. The patient received a two-step surgery: lens phacoemulsification and intraocular lens implant, followed by descemet stripping automated endothelial keratoplasty in both eyes, four months later. There were no complications apart from a recurrent cystoid macular oedema in both eyes. The best corrected visual acuity was 20/40 both eyes, and the patient was satisfied. Descemet stripping automated endothelial keratoplasty may be considered as an alternative to penetrating keratoplasty in the case of endothelial dysfunction and radial keratotomy in patients with no corneal ectasia or significant stromal opacity. Copyright © 2016 Sociedad Española de Oftalmología. Publicado por Elsevier España, S.L.U. All rights reserved.

  4. Radial jetting during the impact of compound drops

    Science.gov (United States)

    Zhang, Jia Ming; Li, Er Qiang; Thoroddsen, Sigurdur

    2014-11-01

    Here we report radial jetting behavior during the impact of compound droplet onto a dry solid surface. The size and number of the inner droplets was precisely controlled by a microfluidic device. With the help of high-speed video imaging from both side view and bottom view, intricate and regular horizontal jetting patterns were recorded. The radial jets are formed due to the interaction between the inner droplets and the outer liquid film, and the jet velocity is much higher than the drop impact velocity. The number of inner droplets and their position within the outer droplet were shown to be very important parameters which governed the generation and pattern of the jets. Other parameters such as droplet impact velocity, inner/outer liquid viscosity, density and interfacial tension have also been varied and used to analyze the jetting dynamics. Entrapment of minute air bubbles was also clearly observed.

  5. Acoustic resonances in two-dimensional radial sonic crystal shells

    Energy Technology Data Exchange (ETDEWEB)

    Torrent, Daniel; Sanchez-Dehesa, Jose, E-mail: jsdehesa@upvnet.upv.e [Wave Phenomena Group, Departamento de Ingenieria Electronica, Universidad Politecnica de Valencia, C/Camino de Vera s.n., E-46022 Valencia (Spain)

    2010-07-15

    Radial sonic crystals (RSC) are fluidlike structures infinitely periodic along the radial direction that verify the Bloch theorem and are possible only if certain specially designed acoustic metamaterials with mass density anisotropy can be engineered (see Torrent and Sanchez-Dehesa 2009 Phys. Rev. Lett. 103 064301). A comprehensive analysis of two-dimensional (2D) RSC shells is reported here. A given shell is in fact a circular slab with a central cavity. These finite crystal structures contain Fabry-Perot-like resonances and modes strongly localized at the central cavity. Semi-analytical expressions are developed to obtain the quality factors of the different resonances, their symmetry features and their excitation properties. The results reported here are completely general and can be extended to equivalent 3D spherical shells and to their photonic counterparts.

  6. Acoustic resonances in two-dimensional radial sonic crystal shells

    Science.gov (United States)

    Torrent, Daniel; Sánchez-Dehesa, José

    2010-07-01

    Radial sonic crystals (RSC) are fluidlike structures infinitely periodic along the radial direction that verify the Bloch theorem and are possible only if certain specially designed acoustic metamaterials with mass density anisotropy can be engineered (see Torrent and Sánchez-Dehesa 2009 Phys. Rev. Lett. 103 064301). A comprehensive analysis of two-dimensional (2D) RSC shells is reported here. A given shell is in fact a circular slab with a central cavity. These finite crystal structures contain Fabry-Perot-like resonances and modes strongly localized at the central cavity. Semi-analytical expressions are developed to obtain the quality factors of the different resonances, their symmetry features and their excitation properties. The results reported here are completely general and can be extended to equivalent 3D spherical shells and to their photonic counterparts.

  7. Study on the Radial Diffuser of Multistage High Pressure Pump

    Energy Technology Data Exchange (ETDEWEB)

    Kim, Deok Su; Mamatov, Sanjar [Hyosung goodsprings inc, Seoul (Korea, Republic of); Park, Warn Gyu [Pusan Nat’l Univ., Busan (Korea, Republic of)

    2016-11-15

    In this study, a high-pressure multistage pump used in the combined cycle power plants is analyzed. The pump performance characteristics (differential head and efficiency) are numerically analyzed for different shapes of the radial diffuser. The design variables selected for the radial diffuser are, number of vanes, diameter ratio (D{sub 4}/D{sub 3}), return channel outlet angle(α{sub 6}), and pressure recovery factor (C{sub p}). The numerical analysis results showed that the differential head and efficiency are the highest when the diameter ratio is the highest. Further, it was observed that the differential head was lower when the return channel outlet angle was 60° than when it was 90°, because of pre-swirl at the diffuser outlet.

  8. Radial electron-beam-breakup transit-time oscillator

    Energy Technology Data Exchange (ETDEWEB)

    Mostrom, M.A. [Mission Research Corp., Albuquerque, NM (United States); Kwan, T.J.T. [Los Alamos National Lab., NM (United States)

    1995-01-01

    A new radially-driven electron-beam-breakup transit-time oscillator has been investigated analytically and through computer simulation as a compact low-impedance high-power microwave generator. In a 1MV, 50kA device 35cm in radius and 15cm long, with no external magnetic field, 5GW of extracted power and a growth rate of 0.26/ns have been observed. Theoretical maximum efficiencies are several times higher.

  9. A case of radial keratoneuritis in non-Acanthamoeba keratitis

    Directory of Open Access Journals (Sweden)

    Mutoh T

    2012-09-01

    Full Text Available Tetsuya Mutoh, Yukihiro Matsumoto, Makoto ChikudaDepartment of Ophthalmology, Dokkyo Medical University Koshigaya Hospital, Saitama, JapanAbstract: A case of non-Acanthamoeba keratitis with radial keratoneuritis, which is thought to be pathognomonic for Acanthamoeba keratitis, is reported. A healthy 32-year-old woman with a history of frequent replacement of her contact lenses due to wear was examined at Dokkyo Medical University Koshigaya Hospital (Saitama, Japan and found to have a slight corneal opacity that was accompanied by radial keratoneuritis. Based on both the patient’s clinical findings and past history, the presence of Acanthamoeba keratitis was highly suspected. However, direct light microscopy of corneal scrapings stained by the Parker ink–potassium hydroxide method only found Acanthamoeba-type material in the specimen collected at her initial visit. In all other specimens collected from the patient, no Acanthamoeba was found either when using the same method or when performing cultures of the surgical debridement of the corneal lesion. In addition, topical antifungal eye drops, systemic antifungal drugs, and surgical debridement were also not effective in this case. Since a precise diagnosis could not be made, the patient was treated with topical 0.1% betamethasone sodium, which ultimately resulted in a dramatic improvement of her corneal inflammation. At 23 days after initiation of topical administration of 0.1% betamethasone sodium, visual acuity was 20/250, with a slight corneal opacity noted at the original site of infection. The outcome of the current case suggests that radial keratoneuritis is not always pathognomonic for Acanthamoeba keratitis.Keywords: radial keratoneuritis, non-Acanthamoeba keratitis, topical corticosteroid

  10. Versatility of radial forearm free flap for intraoral reconstruction

    Directory of Open Access Journals (Sweden)

    Jeremić Jelena V.

    2015-01-01

    Full Text Available Introduction. The radial forearm free flap has an important role in reconstruction of the oncologic defects in the region of head and neck. Objective. The aim was to present and evaluate clinical experience and results in the radial forearm free transfer for intraoral reconstructions after resections due to malignancies. Methods. This article illustrates the versatility and reliability of forearm single donor site in 21 patients with a variety of intraoral oncologic defects who underwent immediate (19 patients, 90.5% or delayed (2 patients, 9.5% reconstruction using free flaps from the radial forearm. Fascio-cutaneous flaps were used in patients with floor of the mouth (6 cases, buccal mucosa (5 cases, lip (1 case and a retromolar triangle (2 cases defects, or after hemiglossectomy (7 cases. In addition, the palmaris longus tendon was included with the flap in 2 patients that required oral sphincter reconstruction. Results. An overall success rate was 90.5%. Flap failures were detected in two (9.5% patients, in one patient due to late ischemic necrosis, which appeared one week after the surgery, and in another patient due to venous congestion, which could not be salvaged after immediate re-exploration. Two patients required re-exploration due to vein thrombosis. The donor site healed uneventfully in all patients, except one, who had partial loss of skin graft. Conclusion. The radial forearm free flap is, due to multiple advantages, an acceptable method for reconstructions after resection of intraoral malignancies. [Projekat Ministarstva nauke Republike Srbije, br. 41006

  11. Stomatal Opening Involves Polar, Not Radial, Stiffening Of Guard Cells.

    Science.gov (United States)

    Carter, Ross; Woolfenden, Hugh; Baillie, Alice; Amsbury, Sam; Carroll, Sarah; Healicon, Eleanor; Sovatzoglou, Spyros; Braybrook, Sioban; Gray, Julie E; Hobbs, Jamie; Morris, Richard J; Fleming, Andrew J

    2017-10-09

    It has long been accepted that differential radial thickening of guard cells plays an important role in the turgor-driven shape changes required for stomatal pore opening to occur [1-4]. This textbook description derives from an original interpretation of structure rather than measurement of mechanical properties. Here we show, using atomic force microscopy, that although mature guard cells display a radial gradient of stiffness, this is not present in immature guard cells, yet young stomata show a normal opening response. Finite element modeling supports the experimental observation that radial stiffening plays a very limited role in stomatal opening. In addition, our analysis reveals an unexpected stiffening of the polar regions of the stomata complexes, both in Arabidopsis and other plants, suggesting a widespread occurrence. Combined experimental data (analysis of guard cell wall epitopes and treatment of tissue with cell wall digesting enzymes, coupled with bioassay of guard cell function) plus modeling lead us to propose that polar stiffening reflects a mechanical, pectin-based pinning down of the guard cell ends, which restricts increase of stomatal complex length during opening. This is predicted to lead to an improved response sensitivity of stomatal aperture movement with respect to change of turgor pressure. Our results provide new insight into the mechanics of stomatal function, both negating an established view of the importance of radial thickening and providing evidence for a significant role for polar stiffening. Improved stomatal performance via altered cell-wall-mediated mechanics is likely to be of evolutionary and agronomic significance. Copyright © 2017 The Authors. Published by Elsevier Ltd.. All rights reserved.

  12. [An analysis of severe complications of radial keratotomy].

    Science.gov (United States)

    Li, Z

    1995-05-01

    Seven cases with severe complications threatening vision, including intraocular infection, corneal leucoma, secondary glaucoma, cataract and delayed rupture of corneal incisions following radial keratotomy (RK) were presented. The causes of the complications are related to corneal perforation and decreased tensile strength of the eye. Correct selection of indications, perfection of technique and instruments, avoidance of corneal perforation and prevention of infection are the measures to prevent severe complications following RK.

  13. Application of radial basis function to approximate functional integral equations

    Directory of Open Access Journals (Sweden)

    Reza Firouzdor

    2016-06-01

    Full Text Available In the present paper, Radial Basis Function (RBF interpolation is applied to approximate the numerical solution of both Fredlholm and Volterra functional integral equations. RBF interpolation is based on linear combinations of terms which include a single univariate function. Applying RBF in functional integral equation, a linear system $ \\Psi C=G $ will be obtain in which by defining coefficient vector $ C $, target function will be approximiated. Finally, validity of the method is illustrated by some examples.

  14. Biología y resultados de la arteria radial

    OpenAIRE

    Gil-Albarova, Oscar

    2011-01-01

    La arteria radial es un conducto ampliamente utilizado en cirugía de revascularización miocárdica en la actualidad. Se revisa su anatomía, técnica de extracción, sus peculiaridades biológicas, las potenciales ventajas y desventajas de su utilización y su comportamiento como injerto en diferentes situaciones clínicas.

  15. Biología y resultados de la arteria radial

    Directory of Open Access Journals (Sweden)

    Oscar Gil-Albarova

    2011-10-01

    Full Text Available La arteria radial es un conducto ampliamente utilizado en cirugía de revascularización miocárdica en la actualidad. Se revisa su anatomía, técnica de extracción, sus peculiaridades biológicas, las potenciales ventajas y desventajas de su utilización y su comportamiento como injerto en diferentes situaciones clínicas.

  16. Radial multipliers on reduced free products of operator algebras

    DEFF Research Database (Denmark)

    Haagerup, Uffe; Møller, Søren

    2012-01-01

    Let AiAi be a family of unital C¿C¿-algebras, respectively, of von Neumann algebras and ¿:N0¿C¿:N0¿C. We show that if a Hankel matrix related to ¿ is trace-class, then there exists a unique completely bounded map M¿M¿ on the reduced free product of the AiAi, which acts as a radial multiplier. Her...

  17. Ripple formation on Nickel irradiated with radially polarized femtosecond beams

    OpenAIRE

    Tsibidis, George D.; Skoulas, Evangelos; Stratakis, Emmanuel

    2015-01-01

    We report on the morphological effects induced by the inhomogeneous absorption of radially polarized femtosecond laser irradiation of nickel (Ni) in sub-ablation conditions. A theoretical prediction of the morphology profile is performed and the role of surface plasmon excitation in the production of self-formed periodic ripples structures is evaluated. Results indicate a smaller periodicity of the ripples profile compared to that attained under linearly polarized irradiation conditions. A co...

  18. Extracellular matrix changes in human corneas after radial keratotomy.

    Science.gov (United States)

    Ljubimov, A V; Alba, S A; Burgeson, R E; Ninomiya, Y; Sado, Y; Sun, T T; Nesburn, A B; Kenney, M C; Maguen, E

    1998-09-01

    Extracellular matrix and basement membrane alterations were identified in human corneas after radial keratotomy. Ten normal and five radial keratotomy autopsy corneas (two at 6 months post surgery, and three at 3 years post surgery) were studied by immunofluorescence with antibodies to 28 extracellular matrix and basement membrane components. Outside of radial keratotomy scars, all studied components had a normal distribution. Of stromal extracellular matrix, only type III collagen accumulated around the scars. The basement membrane around epithelial plugs had a normal composition except for type IV collagen. Its alpha1-alpha2 chains, normally present only in the limbal basement membrane, appeared around all plugs. alpha3 and alpha4 chains were very weak or absent in these areas, contrary to nonscarred areas. This basement membrane pattern was similar to the normal limbal but not to the central corneal pattern. Keratin 3 also had a limbal-like, suprabasal expression in the plug epithelium. The stroma around the scars accumulated tenascin-C, fibrillin-1, types VIII and XIV collagen, all of which were absent from normal corneal basement membrane and extracellular matrix. Only tenascin-C showed less staining in anterior scars 3 years post surgery than 6 months post surgery, but still persisted in posterior scars. Incomplete scar healing was evident even 3 years post radial keratotomy. It was manifested by the accumulation of abnormal extracellular matrix in the anterior and posterior scars and by the limbal-like pattern of type IV collagen isoforms in the basement membrane around epithelial plugs. Copyright 1998 Academic Press.

  19. Haematoma block in reduction of distal radial fractures

    African Journals Online (AJOL)

    radiale distale déplace'e entre janvier 2000 et mars 2001 avaient la reduction de la fracture sous l'obstruction he'matome tout en utili- sant 10ml de 2% lignocaine. ' H y avait une remise importante de la douleur a la suite d'in- filtration de la lignocaine sous la région de la fracture et un soula- gement important au cours de ...

  20. Organisms modeling: The question of radial basis function networks

    Directory of Open Access Journals (Sweden)

    Muzy Alexandre

    2014-01-01

    Full Text Available There exists usually a gap between bio-inspired computational techniques and what biologists can do with these techniques in their current researches. Although biology is the root of system-theory and artifical neural networks, computer scientists are tempted to build their own systems independently of biological issues. This publication is a first-step re-evalution of an usual machine learning technique (radial basis funtion(RBF networks in the context of systems and biological reactive organisms.

  1. Numerical computations of the unsteady flow in a radial turbine

    OpenAIRE

    Hellström, Fredrik

    2008-01-01

    Non-pulsatile and pulsatile flow in bent pipes and radial turbine has been assessed with numerical simulations. The flow field in a single bent pipe has been computed with different turbulence modelling approaches. A comparison with measured data shows that Implicit Large Eddy Simulation (ILES) gives the best agreement in terms of mean flow quantities. All computations with the different turbulence models qualitatively capture the so called Dean vortices. The Dean vortices are a pair of count...

  2. On Bounded Satellite Motion under Constant Radial Propulsive Acceleration

    Directory of Open Access Journals (Sweden)

    Juan F. San-Juan

    2012-01-01

    Full Text Available The Hamiltonian formulation of the constant radial propulsive acceleration problem in nondimensional units reveals that the problem does not depend on any physical parameter. The qualitative description of the integrable flow is given in terms of the energy and the angular momentum, showing that the different regimes are the result of a bifurcation phenomenon. The solution via the Hamilton-Jacobi equation demonstrates that the elliptic integrals of the three kinds are intrinsic to the problem.

  3. Radial Microchannel Reactor (RMR) used in Steam Reforming CH4

    Science.gov (United States)

    2013-05-13

    separate from an external combustion by passing a precisely measurable electrical heat flow through a reactor wall maintained at a well determined...the performance and reduce cost of CHP systems based on SOFC. The experiments, results and conclusion on the 300 micron gap Radial Microchannel...reaction is occurring. Figure 3: Experimental Test Bench Figure 2: RMR Design shown fluid flow, electrical heater and TC locations

  4. Investigating the radial distributions of medium-mass nuclei

    Energy Technology Data Exchange (ETDEWEB)

    Benlliure, J.; Dragosavac, D.; Perez-Loureiro, D.; Alvarez-Pol, H. [Universidad de Santiago de Compostela, 15782 Santiago de Compostela Spain (Spain); Blank, B. [Centre d' Etudes Nucleaires Bordeaux-Gradignan, F-33175 Gradignan (France); Casarejos, E. [Universidad de Santiago de Compostela, 15782 Santiago de Compostela Spain (Spain); Fohr, V. [Gesellschaft fuer Schwerionenforschung mbH, D-64291 Darmstadt (Germany); Gascon, M. [Universidad de Santiago de Compostela, 15782 Santiago de Compostela Spain (Spain); Gawlikowicz, W. [Heavy Ion Laboratory, University of Warsaw, PL-02-093 (Poland); Heinz, A. [WNSL, Yale University, New Haven, Connecticut 06511 (United States); Helariutta, K. [Laboratory of Radiochemistry, P. O. Box 55, FI-00014 Helsinki (Finland); Lukic, S.; Montes, F. [Gesellschaft fuer Schwerionenforschung mbH, D-64291 Darmstadt (Germany); Pienkowski, L. [Heavy Ion Laboratory, University of Warsaw, PL-02-093 (Poland); Staniou, M. [Gesellschaft fuer Schwerionenforschung mbH, D-64291 Darmstadt (Germany); Subotic, K. [Institute of Nuclear Sciences, VINCA, Belgrade 11001 (Serbia); Suemmerer, K. [Gesellschaft fuer Schwerionenforschung mbH, D-64291 Darmstadt (Germany); Taieb, J. [CEA/DAM, Bruyeres-le-Chatel, 91290 Aapajon Cedex (France); Trzcinska, A. [Heavy Ion Laboratory, University of Warsaw, PL-02-093 (Poland); Veselsky, M. [Slovak Academy of Sciences, Dubravska cesta 9, Bratislava (Slovakia)

    2010-03-01

    The radial evolution of the matter distributions with neutron excess has been investigated at GSI measuring total interaction cross sections for long isotopic chains of medium-mass nuclei. Comparisons with different model calculations show a clear increase of the total interaction cross sections for the most neutron-rich nuclei that we interpret as a signature for a larger matter radius of those nuclei.

  5. Proxima Centauri reloaded: Unravelling the stellar noise in radial velocities

    Science.gov (United States)

    Damasso, M.; Del Sordo, F.

    2017-03-01

    Context. The detection and characterisation of Earth-like planets with Doppler signals of the order of 1 m s-1 currently represent one of the greatest challenge for extrasolar-planet hunters. As results for such findings are often controversial, it is desirable to provide independent confirmations of the discoveries. Testing different models for the suppression of non-Keplerian stellar signals usually plaguing radial velocity data is essential to ensuring findings are robust and reproducible. Aims: Using an alternative treatment of the stellar noise to that discussed in the discovery paper, we re-analyse the radial velocity dataset that led to the detection of a candidate terrestrial planet orbiting the star Proxima Centauri. We aim to confirm the existence of this outstanding planet, and test the existence of a second planetary signal. Methods: Our technique jointly modelled Keplerian signals and residual correlated signals in radial velocities using Gaussian processes. We analysed only radial velocity measurements without including other ancillary data in the fitting procedure. In a second step, we have compared our outputs with results coming from photometry, to provide a consistent physical interpretation. Our analysis was performed in a Bayesian framework to quantify the robustness of our findings. Results: We show that the correlated noise can be successfully modelled as a Gaussian process regression, and contains a periodic term modulated on the stellar rotation period and characterised by an evolutionary timescale of the order of one year. Both findings appear to be robust when compared with results obtained from archival photometry, thus providing a reliable description of the noise properties. We confirm the existence of a coherent signal described by a Keplerian orbit equation that can be attributed to the planet Proxima b, and provide an independent estimate of the planetary parameters. Our Bayesian analysis dismisses the existence of a second planetary

  6. Radial dilation of nephrostomy balloons: a comparative analysis

    OpenAIRE

    Kari Hendlin; Manoj Monga

    2008-01-01

    PURPOSE: The dynamics of percutaneous balloon expansion may differ with increasing extrinsic compressive forces and increasing inflation pressures. This study compares the ability of percutaneous balloons to expand under different radial constrictive forces. MATERIALS AND METHODS: Three 30F nephrostomy balloons were tested: Bard X-Force™, Boston Scientific Microvasive Amplatz Tractmaster™, and Cook Ultraxx™. With a super stiff guidewire in place, the balloon tip was secured ...

  7. Radial distribution function of semiflexible oligomers with stretching flexibility

    Science.gov (United States)

    Zhang, Xi; Bao, Lei; Wu, Yuan-Yan; Zhu, Xiao-Long; Tan, Zhi-Jie

    2017-08-01

    The radial distribution of the end-to-end distance Ree is crucial for quantifying the global size and flexibility of a linear polymer. For semiflexible polymers, several analytical formulas have been derived for the radial distribution of Ree ignoring the stretching flexibility. However, for semiflexible oligomers, such as DNA or RNA, the stretching flexibility can be rather pronounced and can significantly affect the radial distribution of Ree. In this study, we obtained an extended formula that includes the stretch modulus to describe the distribution of Ree for semiflexible oligomers on the basis of previous formulas for semiflexible polymers without stretching flexibility. The extended formula was validated by extensive Monte Carlo simulations over wide ranges of the stretch modulus and persistence length, as well as all-atom molecular dynamics simulations of short DNAs and RNAs. Additionally, our analyses showed that the effect of stretching flexibility on the distribution of Ree becomes negligible for DNAs longer than ˜130 base pairs and RNAs longer than ˜240 base pairs.

  8. ION-SCALE TURBULENCE IN THE INNER HELIOSPHERE: RADIAL DEPENDENCE

    Energy Technology Data Exchange (ETDEWEB)

    Comisel, H.; Motschmann, U.; Büchner, J.; Narita, Y.; Nariyuki, Y. [University of Toyama, Faculty of Human Development, 3190, Gofuku, Toyama, 930-8555 (Japan)

    2015-10-20

    The evolution of the ion-scale plasma turbulence in the inner heliosphere is studied by associating the plasma parameters for hybrid-code turbulence simulations to the radial distance from the Sun via a Solar wind model based mapping procedure. Using a mapping based on a one-dimensional solar wind expansion model, the resulting ion-kinetic scale turbulence is related to the solar wind distance from the Sun. For this purpose the mapping is carried out for various values of ion beta that correspond to the heliocentric distance. It is shown that the relevant normal modes such as ion cyclotron and ion Bernstein modes will occur first at radial distances of about 0.2–0.3 AU, i.e., near the Mercury orbit. This finding can be used as a reference, a prediction to guide the in situ measurements to be performed by the upcoming Solar Orbiter and Solar Probe Plus missions. Furthermore, a radial dependence of the wave-vector anisotropy was obtained. For astrophysical objects this means that the spatial scales of filamentary structures in interstellar media or astrophysical jets can be predicted for photometric observations.

  9. Taylor-Couette flow with radial fluid injection

    Science.gov (United States)

    Wilkinson, Nikolas; Dutcher, Cari S.

    2017-08-01

    Taylor-Couette cells have been shown to improve a number of industrial processes due to the wide variety of hydrodynamic flow states accessible. Traditional designs, however, limit the ability to introduce new fluids into the annulus during device operation due to geometric confinement and complexity. In this paper, a co- and counter-rotating Taylor-Couette cell with radial fluid injection has been constructed. The incorporation of 16 ports in the inner cylinder enables radial fluid injection during rotation of both cylinders. The design is also capable of continuous axial flow, enabling large injection volumes. The new inner cylinder design does not modify the critical Re for flow instabilities and can precisely inject a desired mass at a desired flow rate. A range of injection rates and masses were explored to quantify the effect of radial injection on the stability of the turbulent Taylor vortex structure. Only the highest injection rate and total mass studied (5.9 g/s, 100 g) modified the turbulent Taylor vortex structure after injection for a sustained period. The post-injection vortices remained larger than the pre-injection vortices, whereas at lower injection rates or masses, the vortex structure quickly returned to the pre-injection structure. This new system allows for in situ study of hydrodynamic effects on fluid-fluid (gas and liquid) mixing and multiphase complexation, growth, and structure. We demonstrated this new design's potential for studying the flocculation of bentonite using cationic polyacrylamide for enhancing water treatment operations.

  10. Radial selfsimilar solutions of a nonlinear Ornstein-Uhlenbeck equation

    Directory of Open Access Journals (Sweden)

    Arij Bouzelmate

    2007-05-01

    Full Text Available This paper concerns the existence, uniqueness and asymptotic properties (as $r=|x|oinfty$ of radial self-similar solutions to the nonlinear Ornstein-Uhlenbeck equation [ v_t=Delta_p v+xcdot abla (|v|^{q-1}v ] in $mathbb{R}^Nimes (0, +infty$. Here $q>p-1>1$, $Ngeq 1$, and $Delta_p$ denotes the $p$-Laplacian operator. These solutions are of the form [ v(x,t=t^{-gamma} U(cxt^{-sigma}, ] where $gamma$ and $sigma$ are fixed powers given by the invariance properties of differential equation, while $U$ is a radial function, $U(y=u(r$, $r=|y|$. With the choice $c=(q-1^{-1/p}$, the radial profile $u$ satisfies the nonlinear ordinary differential equation $$ (|u'|^{p-2}u''+frac{N-1}r |u'|^{p-2}u'+frac{q+1-p}{p} r u'+(q-1 r(|u|^{q-1}u'+u=0 $$in $mathbb{R}_+$. We carry out a careful analysis of this equation anddeduce the corresponding consequences for the Ornstein-Uhlenbeck equation.

  11. Long-term outcomes following radial polydactyly reconstruction.

    Science.gov (United States)

    Stutz, Chris; Mills, Janith; Wheeler, Lesley; Ezaki, Marybeth; Oishi, Scott

    2014-08-01

    To report long-term outcomes (> 10 y) after radial polydactyly reconstruction. We evaluated 43 surgically reconstructed thumbs in 41 patients with radial polydactyly whom we had observed for more than 10 years. The study group included 12 Flatt type II, 8 type III, 17 type IV, and 6 type V. The average age of surgery was 1 year and mean follow-up was 17 years. Objective outcome values and validated patient-oriented outcome evaluations were obtained. No early postsurgical complications were encountered. Eight patients had 10 revision procedures at an average of 8 years after the initial procedure. Five patients had interphalangeal joint arthrodesis, all for angulation with accompanying pain. The average Tada score was 4.1. Lateral, tripod, and tip pinch strengths were 96%, 86%, and 92%, respectively, of the unaffected side. As a group, the treated thumbs had significantly weaker tip and tripod pinch strengths than the untreated thumbs. The average Disabilities of the Arm, Shoulder, and Hand score was 4.5 and the average Pediatric Quality of Life Inventory score was 87 when administered to both the patient and the parent. Long-term results after surgical reconstruction for radial polydactyly were excellent but the revision rate trended upward over time despite maintenance of favorable scores on the objective outcome measures used. Therapeutic IV. Copyright © 2014 American Society for Surgery of the Hand. Published by Elsevier Inc. All rights reserved.

  12. A clinically weighted approach to outcome assessment in radial polydactyly.

    Science.gov (United States)

    Dijkman, R; Selles, R; van Rosmalen, J; Hülsemann, W; Mann, M; Habenicht, R; Hovius, S; van Nieuwenhoven, C

    2016-03-01

    Currently available outcome assessment systems for radial polydactyly are mainly based on expert opinion. The aim of this study was to develop an outcome assessment system based on clinical data. We performed linear regression analysis on data from a multicentre study of 121 patients with radial polydactyly types II, IV and VII to develop a clinically weighted outcome assessment system. Items were weighted according to their influence on overall functional and aesthetic outcome in the regression analysis. Active flexion, scar appearance and prominence at amputation site were the main items influencing overall functional and aesthetic outcome (β = 0.393, β = 0.326 and β = 0.288, respectively). Palmar abduction, metacarpophalangeal joint deviation and nail appearance influenced overall functional and aesthetic outcome the least (β = -0.002, β = -0.104 and β = 0.070, respectively). Our proposed assessment system for radial polydactyly reflects the way clinicians value individual aspects of outcome as determinants of overall outcome and helps guide future treatment and evaluation of outcome. III. © The Author(s) 2015.

  13. SpicyNodes: radial layout authoring for the general public.

    Science.gov (United States)

    Douma, Michael; Ligierko, Grzegorz; Ancuta, Ovidiu; Gritsai, Pavel; Liu, Sean

    2009-01-01

    Trees and graphs are relevant to many online tasks such as visualizing social networks, product catalogs, educational portals, digital libraries, the semantic web, concept maps and personalized information management. SpicyNodes is an information-visualization technology that builds upon existing research on radial tree layouts and graph structures. Users can browse a tree, clicking from node to node, as well as successively viewing a node, immediately related nodes and the path back to the "home" nodes. SpicyNodes' layout algorithms maintain balanced layouts using a hybrid mixture of a geometric layout (a succession of spanning radial trees) and force-directed layouts to minimize overlapping nodes, plus several other improvements over prior art. It provides XML-based API and GUI authoring tools. The goal of the SpicyNodes project is to implement familiar principles of radial maps and focus+context with an attractive and inviting look and feel in an open system that is accessible to virtually any Internet user.

  14. Servo control system construction for CBHD radial and axial tracking

    Science.gov (United States)

    Cui, Yingchao; Cheng, Xuemin; Ma, Jianshe; Hou, Xinnan

    2010-11-01

    CBHD (China Blue High Definition Disc) is a high-definition optical disc standard with Chinese independent intellectual property. Compared with DVD optical pick-up, CBHD optical pick-up, key component of CBHD player, has significant improvement in the channel bit rate and certain reduction in acceptable tolerance range for disk tilt, etc. This paper specifies the servo control system construction for the CBHD radial tracing and axial tracking. This servo control system should ensure the optical beam of OPU focusing on the Disc plane and following the track of CBHD channel accurately. According to the expected radial/axial maximum acceleration and the limitation of emax, an open-loop transfer function specifying the servo system for axial and radial tracking is introduced. The corresponding servo control algorithm including IIR filter based on the above-mentioned transfer function is theoretically analyzed and numerically simulated by MATLAB. Because optical pick-ups are different in dynamic properties and its digital circuit exist quantization error, time delay nonlinearity, etc, the tuning of IIR parameters is laborious and time-consuming. Thus a experimental platform for CBHD optical pick-up servo system are designed in this paper, and an user-friendly interface for IIR parameters adjustment is given. Experimental results showed that this control system has good servo characteristics in time-domain and frequency-domain.

  15. Analytical solutions for the radial Scarf II potential

    Science.gov (United States)

    Lévai, G.; Baran, Á.; Salamon, P.; Vertse, T.

    2017-06-01

    The real Scarf II potential is discussed as a radial problem. This potential has been studied extensively as a one-dimensional problem, and now these results are used to construct its bound and resonance solutions for l = 0 by setting the origin at some arbitrary value of the coordinate. The solutions with appropriate boundary conditions are composed as the linear combination of the two independent solutions of the Schrödinger equation. The asymptotic expression of these solutions is used to construct the S0 (k)s-wave S-matrix, the poles of which supply the k values corresponding to the bound, resonance and anti-bound solutions. The location of the discrete energy eigenvalues is analyzed, and the relation of the solutions of the radial and one-dimensional Scarf II potentials is discussed. It is shown that the generalized Woods-Saxon potential can be generated from the Rosen-Morse II potential in the same way as the radial Scarf II potential is obtained from its one-dimensional correspondent. Based on this analogy, possible applications are also pointed out.

  16. Protective effect of new hygienic means on the oral mucous tunic at radial stomatitis

    OpenAIRE

    Ієвлєва, Юлія Валеріївна

    2015-01-01

    The radial stomatitis development is the one of the main problems in patients who underwent radial therapy of the malignant tumors in head and neck region that impedes the effective antitumor treatment. The means of prophylaxis and local treatment of radial injuries are not always effective.Aim of research. The determination of effectiveness of the new hygienic means based on antimatters on the state of oral mucous tunic at the radial stomatitis.Materials and methods of research. Experiments ...

  17. Endoscopic versus open radial artery harvest and mammario-radial versus aorto-radial grafting in patients undergoing coronary artery bypass surgery: protocol for the 2 × 2 factorial designed randomised NEO trial.

    Science.gov (United States)

    Carranza, Christian L; Ballegaard, Martin; Werner, Mads U; Hasbak, Philip; Kjær, Andreas; Kofoed, Klaus F; Lindschou, Jane; Jakobsen, Janus Christian; Gluud, Christian; Olsen, Peter Skov; Steinbrüchel, Daniel A

    2014-04-23

    Coronary artery bypass grafting using the radial artery has, since the 1990s, gone through a revival. Observational studies have indicated better long-term patency when using radial arteries. Therefore, radial artery might be preferred especially in younger patients where long time patency is important. During the last 10 years different endoscopic techniques to harvest the radial artery have evolved. Endoscopic radial artery harvest only requires a small incision near the wrist in contrast to open harvest, which requires an incision from the elbow to the wrist. However, it is unknown whether the endoscopic technique results in fewer complications or a graft patency comparable to open harvest. When the radial artery has been harvested, there are two ways to use the radial artery as a graft. One way is sewing it onto the aorta and another is sewing it onto the mammary artery. It is unknown which technique is the superior revascularisation technique. The NEO Trial is a randomised clinical trial with a 2 × 2 factorial design. We plan to randomise 300 participants into four intervention groups: (1) mammario-radial endoscopic group; (2) aorto-radial endoscopic group; (3) mammario-radial open surgery group; and (4) aorto-radial open surgery group.The hand function will be assessed by a questionnaire, a clinical examination, the change in cutaneous sensibility, and the measurement of both sensory and motor nerve conduction velocity at 3 months postoperatively. All the postoperative complications will be registered, and we will evaluate muscular function, scar appearance, vascular supply to the hand, and the graft patency including the patency of the central radial artery anastomosis. A patency evaluation by multi-slice computer tomography will be done at one year postoperatively.We expect the nerve conduction studies and the standardised neurological examinations to be able to discriminate differences in hand function comparing endoscopic to open harvest of the

  18. Exposure of distal radius fractures using a direct radial approach with mobilization of the superficial branch of the radial nerve.

    Science.gov (United States)

    Pirela-Cruz, Miguel A; Scher, Danielle L

    2010-12-01

    Extraarticular and simple intraarticular fractures and malunions of the distal radius can be addressed through a direct radial approach that entails careful and meticulous handling of the soft tissues. This approach involves mobilization of the superficial branch of the radial nerve (SBRN) and extensor tendons of the first dorsal compartment. A Type I SBRN pattern is when the nerve presents as a single bundle. In Type II pattern, there are 2 major nerve groups present. With Type II branching patterns of the SBRN, careful intraneural dissection is required to mobilize the nerve branches into a safe location during surgery. The primary advantage of this approach is the ease of surgical dissection and avoidance of the flexor tendons of the fingers during surgery.

  19. Compartmentation of sucrose during radial transfer in mature sorghum culm

    Directory of Open Access Journals (Sweden)

    Vietor Donald M

    2007-06-01

    Full Text Available Abstract Background The sucrose that accumulates in the culm of sorghum (Sorghum bicolor (L. Moench and other large tropical andropogonoid grasses can be of commercial value, and can buffer assimilate supply during development. Previous study conducted with intact plants showed that sucrose can be radially transferred to the intracellular compartment of mature ripening sorghum internode without being hydrolysed. In this study, culm-infused radiolabelled sucrose was traced between cellular compartments and among related metabolites to determine if the compartmental path of sucrose during radial transfer in culm tissue was symplasmic or included an apoplasmic step. This transfer path was evaluated for elongating and ripening culm tissue of intact plants of two semidwarf grain sorghums. The metabolic path in elongating internode tissue was also evaluated. Results On the day after culm infusion of the tracer sucrose, the specific radioactivity of sucrose recovered from the intracellular compartment of growing axillary-branch tissue was greater (nearly twice than that in the free space, indicating that sucrose was preferentially transferred through symplasmic routes. In contrast, the sucrose specific radioactivity in the intracellular compartment of the mature (ripening culm tissue was probably less (about 3/4's than that in free space indicating that sucrose was preferentially transferred through routes that included an apoplasmic step. In growing internodes of the axillary branch of sorghum, the tritium label initially provided in the fructose moiety of sucrose molecules was largely (81% recovered in the fructose moiety, indicating that a large portion of sucrose molecules is not hydrolysed and resynthesized during radial transfer. Conclusion During radial transfer of sucrose in ripening internodes of intact sorghum plants, much of the sucrose is transferred intact (without hydrolysis and resynthesis and primarily through a path that includes an

  20. Balloon-Assisted Tracking Use Reduces Radial Artery Access Failure in an Experienced Radial Center and is Feasible During Primary PCI for STEMI.

    Science.gov (United States)

    Obaid, Daniel; Hailan, Ahmed; Chase, Alexander; Dorman, Stephen; Jenkins, Geraint; Raybould, Adrian; Ramsey, Mark; Thomas, Phillip; Smith, David; Ionescu, Adrian

    2017-07-01

    This prospective study assesses balloon-assisted tracking (BAT) in reducing radial access failure during percutaneous coronary intervention (PCI). Arterial spasm prevents PCI from the radial artery in a small percentage of cases. A total of 2223 consecutive patients undergoing PCI from the radial approach were analyzed. Radial access failure mode and requirement for crossover to femoral access during a 12-month run-in period were compared with the following 14-month period with routine BAT usage. During the 14-month study period, 1334 radial PCIs were attempted. Twenty-six patients switched to femoral at an early stage, while 76 encountered radial spasm and underwent successful BAT in 69 cases (91%), giving a total crossover rate to femoral of 33/1334 (2.5%). Utilizing BAT rather than a femoral puncture reduced our institution's radial-femoral crossover rate from 7.6% to 2.5% (P<.01), which is also significantly lower than the radial-femoral crossover rate in the 12 months before BAT implementation (6.1%; P<.01). Mean procedure times were similar for those requiring BAT compared with conventional radial access (51.3 ± 21.3 min vs 47.9 ± 23.7 min; P=.23), and those crossing straight to femoral (BAT not attempted) (60.7 ± 31.9 min; P=.10). Mean first device/balloon time for the BAT-assisted primary PCI cases (22.6 ± 9.4 min) was similar to cases that had radial difficulties and converted to femoral without attempting BAT (25.8 ± 13.4 min; P=.54). BAT allowed catheter passage despite radial spasm in 91% of cases, significantly reducing the institution's rate of femoral crossover. During radial spasm in primary PCI, using BAT did not delay reperfusion compared with femoral crossover.

  1. Do ray cells provide a pathway for radial water movement in the stems of conifer trees?

    Science.gov (United States)

    David M. Barnard; Barbara Lachenbruch; Katherine A. McCulloh; Peter Kitin; Frederick C. Meinzer

    2013-01-01

    The pathway of radial water movement in tree stems presents an unknown with respect to whole-tree hydraulics. Radial profiles have shown substantial axial sap flow in deeper layers of sapwood (that may lack direct connection to transpiring leaves), which suggests the existence of a radial pathway for water movement. Rays in tree stems include ray tracheids and/or ray...

  2. Unusual radial nerve injury by a locking compression plate for humerus fracture

    NARCIS (Netherlands)

    Kinaci, Ahmet; Kloen, Peter; Videler, Annemieke; Kreulen, Mick

    2014-01-01

    The management of primary and secondary radial nerve palsy associated with humeral shaft fractures is still controversial. Radial nerve function is likely to return spontaneously after primary as well as secondary radial nerve palsy in the absence of any level of neurotmesis. Identification and

  3. Radial and humeral fractures as predictors of subsequent hip, radial or humeral fractures in women, and their seasonal variation

    DEFF Research Database (Denmark)

    Lauritzen, J B; Schwarz, Peter; McNair, P

    1993-01-01

    or the humerus. Women suffering an upper extremity fracture (radius or humerus) in snowy or icy weather had a marginally increased risk (RR = 1.3, 0.4-2.3, 95% CL and RR = 1.8, 0.3-3.4, 95% CL) for a later hip fracture. A woman 50 years old with a radial or a humeral fracture had an estimated residual lifetime...

  4. Laxity of the elbow after experimental excision of the radial head and division of the medial collateral ligament. Efficacy of ligament repair and radial head prosthetic replacement

    DEFF Research Database (Denmark)

    Jensen, Steen Lund; Deutch, Søren R; Olsen, Bo Sanderhoff

    2003-01-01

    We studied the stabilising effect of prosthetic replacement of the radial head and repair of the medial collateral ligament (MCL) after excision of the radial head and section of the MCL in five cadaver elbows. Division of the MCL increased valgus angulation (mean 3.9 +/- 1.5 degrees) and internal...... that the radial head is a constraint secondary to the MCL for both valgus displacement and internal rotation. Isolated repair of the ligament is superior to isolated prosthetic replacement and may be sufficient to restore valgus and internal rotatory stability after excision of the radial head in MCL...

  5. Gradiente radial de [Mg/Fe] em duas galáxias elípticas

    Science.gov (United States)

    Milone, A.; Capelato, H.

    2003-08-01

    Basicamente, são propostos dois cenários de evolução quí mio-dinâmico para os sistemas esferoidais: (i) o hierárquico através da fusão e/ou acresção de sub-sistemas com ou sem surtos de formação estelar, e (ii) o colapso monolí tico dissipativo com formação estelar interrompida por um vento galáctico. Ambos, dentro de certos limites, conseguem explicar os gradientes internos de metalicidade estelar presentes nas galáxias elí pticas bem como a relação observada entre a metalicidade central e a massa (Mg20 vs. log sv0). No entanto, nenhum prevê uma variação interna para a razão de abundâncias Mg/Fe que indiretamente define a escala temporal da formação estelar. Empregamos a espectroscopia óptica de fenda longa com a finalidade de recuperar as histórias de formação estelar, de enriquecimento quí mico e da dinâmica dentro de determinadas regiões das galáxias. Os espectros de média resolução (FWHM = 7,1 Å) e escala angular de 1,092 arcsec/pixel foram coletados com o telescópio 1,60m do OPD/LNA. Comparamos nossas medidas de linhas de absorção com resultados espectrofotométricos de modelos de populações estelares simples - mais especificamente os í ndices do Sistema Lick como Mg2, Mg b, e Hb - a fim de se investigar as variações internas de [Fe/H], [Mg/Fe] e idade. Para duas galáxias elí pticas, NGC 1052 e NGC 7796, pertencentes a ambientes de baixa densidade, encontramos uma variação radial da razão Mg/Fe decrescente do centro para fora em regiões de 0,6 e 1 raio efetivo respectivamente. Discutimos alguns cenários de enriquecimento quí mico para estas duas galáxias.

  6. Mechanical properties of radial bone defects treated with autogenous graft covered with hydroxyapatite in rabbit Propriedades mecânicas de defeito de osso radial tratado com enxerto autógeno coberto com nano-hydroxyapatite em coelho

    Directory of Open Access Journals (Sweden)

    Davood Sharifi

    2012-03-01

    defeitos no grupo I foram deixados sem preenchimento, enquanto no grupo II o defeito foi preenchido com 10 mm de costela recoberta com nano-hidroxiapatita. Os coelhos nos três grupos foram distribuídos em dois subgrupos (Um e três meses, com três coelhos cada um. RESULTADOS: A propriedade mecânica e a média do peso para fraturar o osso radial normal foi 388,2±6 N, enquanto para o Grupo I, com um mês foi 72,4±12,8 N, para o grupo II 182,4±14,2 N e para o Grupo III 211,6±10,4 N. Após três meses de implantação, os valores foram 97,6±10,2 N para o Grupo I, 324,6±8,2 N para o Grupo II e 372,6±17,4 N para o Grupo III. CONCLUSÃO: A implantação de enxerto autólogo recoberto com hidroxiapatita indicou ter um efeito positivo na formação integral qualitativa do calo ósseo no local da fratura e precoce reorganização do calo com recuperação da força mecânica.

  7. Determinação da Massa e Dados Orbitais de Exoplanetas pelo Método Doppler

    OpenAIRE

    Amorim, R. G. G.; Santos, W.C.

    2017-01-01

    O Método Doppler, também denominado método das velocidades radiais, é uma técnica utilizada na detecção de exoplanetas. Cerca de 70% dos planetas extra-solares conhecidos foram determinados utilizando esta técnica. O Método Doppler consiste em determinar os deslocamentos espectrais da estrela hospedeira, os quais possibilitam a mensuração da variação da velocidade radial com que a estrela hospedeira se aproxima ou se afasta da Terra. Este movimento da estrela hospedeira em torno do centro de ...

  8. Queratotomía radial versus miniqueratotomía radial: Experiencia en el Hospital "Ramón Pando Ferrer" Radial keratotomy versus radial minikeratotomy: Experience in "Ramón Pando Ferrer" Hospital

    Directory of Open Access Journals (Sweden)

    José Edilberto Pacheco Serrano

    2000-06-01

    Full Text Available La miniqueratotomía radial se viene realizando desde 1995. Se plantea que incisiones más cortas tienen el mismo efecto y producen menos debilidad corneal, ya que disminuye la susceptibilidad a sufrir complicaciones graves provenientes de traumas de la vida cotidiana. Esta idea nos motivó a realizar un estudio para observar el comportamiento de incisiones más cortas en nuestro centro y, en caso de resultados positivos, implementar la técnica de manera que nuestros pacientes puedan beneficiarse de ella. Se comparan resultados de la aplicación de dos técnicas quirúrgicas refractivas para corrección de miopía entre leve y moderada. Se seleccionaron 38 pacientes entre 20 y 40 años de edad, con miopías entre -2 y -6 dioptrías y astigmatismo no mayor a -0,75 dioptrías. Se realizó queratotomía radial convencional en el ojo derecho y miniqueratotomía radial en el ojo izquierdo del mismo paciente. Las variaciones obtenidas en promedio fueron, en el ojo derecho: la esfera (en dioptrías D de -3,38 a -0,32, cilindro de -0,48 a -0,45 D, la queratometría de 44,75 a 41,21 D. En el ojo izquierdo: la esfera de -3,38 D a -0,44 D, cilindro de -0,44 D a -0,38 D, la queratometría de 44,83 a 41,80 D. Hubo una mejoría de la agudeza visual sin cristales de 0,61 en el ojo derecho y 0,59 en el ojo izquierdo. Las dos técnicas no mostraron diferencias estadísticamente significativas, con el beneficio de que la nueva técnica disminuye el riesgo de ruptura postraumática, según la bibliografía revisada, a causa de la menor injuria corneal.In this hospital, radial keratotomy is performed sice 1995. We propose that shorter incisions have some effect and cause less corneal weakness, since dicreases susceptibility to severe complications from traumata of daily life. This notion encouraged us to carry out a study to observe behaviour of shorter incisions in our service, and in the event of positive results, implementation of the technique so that our

  9. Determinants of radial artery pulse wave analysis in asymptomatic individuals.

    Science.gov (United States)

    Duprez, Daniel A; Kaiser, Daniel R; Whitwam, Wayne; Finkelstein, Stanley; Belalcazar, Andres; Patterson, Robert; Glasser, Stephen; Cohn, Jay N

    2004-08-01

    Noninvasive techniques to evaluate arterial stiffness include noninvasive radial artery pulse contour analysis. Diastolic pulse contour analysis provides a separate assessment of large (C1) and small artery (C2) elasticity. Analysis of the systolic pulse contour identifies two pressure peaks (P1 and P2) that relate to incident and reflected waves. This study aimed to compare indices from systolic and diastolic pulse contour analysis from the radial pressure waveform and to correlate these indices with traditional risk factors in asymptomatic individuals screened for cardiovascular disease. In 298 consecutive subjects (206 male and 92 female healthy subjects with a mean age of 50 +/- 12 years), noninvasive radial artery pressure waveforms were acquired with a piezoelectric transducer and analyzed for 1) diastolic indices of C1 and C2 from the CR-2000 CVProfiler, and 2) systolic indices of augmentation as defined by augmentation pressure (AP), augmentation index (AIx), and systolic reflective index (SRI = P2/P1). These indices were then correlated to each other as well as to individual traditional risk factors and the Framingham Risk Score. Diastolic indices were significantly and inversely correlated to systolic indices with C2 showing a stronger inverse association than C1. C2 and Alx were significantly correlated with height, weight, and body mass index in men but not in women. All indices correlated better to blood pressure in women than men. In women, only systolic indices were significantly correlated to HDL cholesterol and only diastolic indices were significantly correlated to LDL cholesterol. All indices were significantly correlated to the Framingham Risk Score, which was stronger in women then men, but when adjusted for age only diastolic indices remained significant in women. Diastolic and systolic indices of pulse contour analysis correlate differently with traditional risk factors in men and women. Copyright 2004 American Journal of Hypertension, Ltd.

  10. Radial dependence of the dark matter distribution in M33

    Science.gov (United States)

    López Fune, E.; Salucci, P.; Corbelli, E.

    2017-06-01

    The stellar and gaseous mass distributions, as well as the extended rotation curve, in the nearby galaxy M33 are used to derive the radial distribution of dark matter density in the halo and to test cosmological models of galaxy formation and evolution. Two methods are examined to constrain the dark mass density profiles. The first method deals directly with fitting the rotation curve data in the range of galactocentric distances 0.24 ≤ r ≤ 22.72 kpc. Using the results of collisionless Λ cold dark matter numerical simulations, we confirm that the Navarro-Frenkel-White (NFW) dark matter profile provides a better fit to the rotation curve data than the cored Burkert profile (BRK) profile. The second method relies on the local equation of centrifugal equilibrium and on the rotation curve slope. In the aforementioned range of distances, we fit the observed velocity profile, using a function that has a rational dependence on the radius, and we derive the slope of the rotation curve. Then, we infer the effective matter densities. In the radial range 9.53 ≤ r ≤ 22.72 kpc, the uncertainties induced by the luminous matter (stars and gas) become negligible, because the dark matter density dominates, and we can determine locally the radial distribution of dark matter. With this second method, we tested the NFW and BRK dark matter profiles and we can confirm that both profiles are compatible with the data, even though in this case the cored BRK density profile provides a more reasonable value for the baryonic-to-dark matter ratio.

  11. [Effect on wrist joint stability following distal radial fractures].

    Science.gov (United States)

    Fei, Jun-Liang; Wang, Li-Ming; Jiang, Chun-Zhi

    2008-01-01

    To investigate the influence of wrist joint stability of patients with diversified fracture of the distal radius, and to find out the difference of the clinical effect between the patients with surgical treatment and non-surgical treatment. From January 1999 to September 2006 a total of 200 cases with the fracture of the distal radius were reviewed according to the AO classification, the radiolunate angle, scapholunate angle, palmar tilt angle and the length of the radial shorting and step-off of the articular surface were measured by the standard X-ray. Gartland and Werley as modified by Sarmiento evaluation system was used, and the results were statistically analyzed. The average follow-up period was 5 years and 2 months. The follow-ups revealed 5 types of carpal instability: scapholunate dissociation, volar intercalated segment instability, dorsal intercalated segment instability and palmar or dorsal shift of the carpus. Functional results were excellent and good in 78% of the total patients. The increasing of the length of the radial shorting and step-off of the articular surface was found to be associated with greater risk of carpal instability. Based on the results of the study, wrist articular surface and radial shortening and palmar tilt angle should be considered as the most important factors of the healing effect after the fracture of the distal radius. Wrist joint stability depends on the structure of the bone and ligament around wrist joint. Carpal instability wound leads to significantly effect on the wrist. And surgery was necessary to severe intra-articular fracture of the distal radius.

  12. Observation of Radial Ring Deformations using Closed Orbits at LEP

    CERN Document Server

    Wenninger, J

    1999-01-01

    With a circumference of 27.7 km the LEP ring is subject to long large geological deformations which must be monitored accurately to guarantee a sufficient precision on the beam energy for the LEP experiments. Changes of the LEP circimference can be extracted from the radial position of the closed orbits with an accurancy better than 0.1 mm. The observed tidal deformations with amplitudes of up to 1 mm were found to be in good agreement with geological models. Besides such periodic effects seasonalcircumference variations of 2 mm are also observed. A summary of measurements collected between 1993 and 1998 is presented.

  13. Radial selfsimilar solutions of a nonlinear Ornstein-Uhlenbeck equation

    OpenAIRE

    Arij Bouzelmate; Abdelilah Gmira; Guillermo Reyes

    2007-01-01

    This paper concerns the existence, uniqueness and asymptotic properties (as $r=|x|oinfty$) of radial self-similar solutions to the nonlinear Ornstein-Uhlenbeck equation [ v_t=Delta_p v+xcdot abla (|v|^{q-1}v) ] in $mathbb{R}^Nimes (0, +infty)$. Here $q>p-1>1$, $Ngeq 1$, and $Delta_p$ denotes the $p$-Laplacian operator. These solutions are of the form [ v(x,t)=t^{-gamma} U(cxt^{-sigma}), ] where $gamma$ and $sigma$ are fixed powers given by the invariance properties of differential equation...

  14. Heat Explosion In Porous Media Using Radial Basis Functions

    Directory of Open Access Journals (Sweden)

    Allali Karam

    2016-01-01

    Full Text Available The paper is devoted to the numerical investigation of the interaction between natural convection and heat explosion in a fluid-saturated porous media in a rectangular domain. The model consists of Darcy equations for an incompressible fluid in a porous medium coupled with the nonlinear heat equation. Numerical simulations are performed using the radial basis functions method (RBFs. We study the bifurcation of the periodic oscillation of the response born by Hopf bifurcation. First, a symmetry-breaking bifurcations observed; then is followed by successive period-doubling bifurcations leading to chaos.

  15. Proton acceleration by radially polarized chirped laser pulses

    Directory of Open Access Journals (Sweden)

    Jin-Lu Liu (刘晋陆

    2012-04-01

    Full Text Available Within the framework of plane-wave angular spectrum analysis of electromagnetic fields, a solution for the field of a tightly focused radially polarized (RP chirped laser pulse is presented. With this solution, direct laser acceleration of protons by this kind of RP laser pulses is investigated numerically. It is found that a RP laser pulse with proper negative frequency chirps can lead to efficient proton acceleration, reaching sub-GeV at the laser intensity of 10^{22}  W/cm^{2} from its injection energy of 45 MeV.

  16. Identifying Clusters with Mixture Models that Include Radial Velocity Observations

    Science.gov (United States)

    Czarnatowicz, Alexis; Ybarra, Jason E.

    2018-01-01

    The study of stellar clusters plays an integral role in the study of star formation. We present a cluster mixture model that considers radial velocity data in addition to spatial data. Maximum likelihood estimation through the Expectation-Maximization (EM) algorithm is used for parameter estimation. Our mixture model analysis can be used to distinguish adjacent or overlapping clusters, and estimate properties for each cluster.Work supported by awards from the Virginia Foundation for Independent Colleges (VFIC) Undergraduate Science Research Fellowship and The Research Experience @Bridgewater (TREB).

  17. Market Assessment and Commercialization Strategy for the Radial Sandia Cooler

    Energy Technology Data Exchange (ETDEWEB)

    Goetzler, William [Navigant Consulting, Inc., Burlington, MA (United States); Shandross, Richard [Navigant Consulting, Inc., Burlington, MA (United States); Weintraub, Daniel [Navigant Consulting, Inc., Burlington, MA (United States); Young, Jim [Navigant Consulting, Inc., Burlington, MA (United States)

    2014-02-01

    This market assessment and commercialization report characterizes and assesses the market potential of the rotating heat exchanger technology developed at Sandia National Laboratories (SNL), known as the Radial Sandia Cooler. The RSC is a novel, motor-driven, rotating, finned heat exchanger technology. The RSC was evaluated for the residential, commercial, industrial, and transportation markets. Recommendations for commercialization were made based on assessments of the prototype RSC and the Sandia Cooler technology in general, as well as an in-depth analysis of the six most promising products for initial RSC commercialization.

  18. [Surgical management for severe complications following radial keratotomy].

    Science.gov (United States)

    Chen, J; Lin, Y; Li, Y

    1996-03-01

    To investigate the surgical treatment for severe complications after radial keratotomy (RK). A protocol of surgical treatment for 3 severe complications after RK, i.e., early corneal perforation and infection, corneal rupture following contusion and corneal leucoma, is proposed based on modern microsurgical techniques and computer assisted corneal topography. All eyes with such severe complications were salvaged and their visual outcomes were also satisfactory. Severe complications after RK threaten the eye. Special management should be applied for these situations. With the help of corneal topography, the refractive results of corneal surgeries can be improved.

  19. Transplantaciones tendinosas por parálisis radial

    OpenAIRE

    De la Puente, Luis; Facultad de Medicina, Universidad Nacional Mayor de San Marcos, Lima, Perú

    2014-01-01

    Entre las parálisis periféricas determinadas por lesiones traumáticas de los nervios, la parálisis del radial es la que origina mayores perturbaciones en las funciones del miembro. La inhabilitación del miembro enfermo es, generalmente, mas seria que la que ocasionan las lesiones del nervio cubital o del mediano, nervios que, funcionalmente, son susceptibles de suplirse en el territorio muscular que inervan conjuntamente. Among peripheral paralysis determined by traumatic nerve injuries, p...

  20. Percutaneous antegrade transarterial treatment of iatrogenic radial arteriovenous fistula.

    Science.gov (United States)

    Summaria, Francesco; Romagnoli, Enrico; Preziosi, Paolo

    2012-01-01

    Site of access vascular complications is infrequent after transradial interventions. We report the case of a 66-year-old man referred to our hospital because of right forearm swelling, oedema and pain with functional forearm disability, 1 year after a transradial primary percutaneous coronary intervention (PCI). The diagnostic and procedural issues are discussed. This is the first description of a successful and well-tolerated radial arteriovenous fistula (AVF) treatment by means of percutaneous antegrade approach with the use of a short introducer and a biocompatible covered stent.

  1. Existence of infinitely many radial solutions for quasilinear Schrodinger equations

    Directory of Open Access Journals (Sweden)

    Gui Bao

    2014-10-01

    Full Text Available In this article we prove the existence of radial solutions with arbitrarily many sign changes for quasilinear Schrodinger equation $$ -\\sum_{i,j=1}^{N}\\partial_j(a_{ij}(u\\partial_iu +\\frac{1}{2}\\sum_{i,j=1}^{N}a'_{ij}(u\\partial_iu\\partial_ju+V(xu =|u|^{p-1}u,~x\\in\\mathbb{R}^N, $$ where $N\\geq3$, $p\\in(1,\\frac{3N+2}{N-2}$. The proof is accomplished by using minimization under a constraint.

  2. Partially Coherent, Radially Polarized Beam with Annular Apodization

    Directory of Open Access Journals (Sweden)

    C. Mariyal

    2014-01-01

    Full Text Available Based on the vectorial Debye theory, the tight focusing properties of partially coherent, radially polarized vortex beams are investigated in detail. In this paper, we propose to use an amplitude modulated filter in combination with a high NA lens to generate long focal depth in the focal region. Numerical results show that the generation of long focal depth of FWHM (22.08λ is achieved, which finds useful application in microscopy techniques such as particle acceleration, laser processing, optical micromanipulation, and beam shaping.

  3. Partially coherent, radially polarized beam with annular apodization.

    Science.gov (United States)

    Mariyal, C; Suresh, P; Rajesh, K B; Pillai, T V S

    2014-01-01

    Based on the vectorial Debye theory, the tight focusing properties of partially coherent, radially polarized vortex beams are investigated in detail. In this paper, we propose to use an amplitude modulated filter in combination with a high NA lens to generate long focal depth in the focal region. Numerical results show that the generation of long focal depth of FWHM (22.08λ) is achieved, which finds useful application in microscopy techniques such as particle acceleration, laser processing, optical micromanipulation, and beam shaping.

  4. First evidence for a charm radial excitation, $D^{*}'$

    CERN Document Server

    Abreu, P; Adye, T; Adzic, P; Ajinenko, I; Alekseev, G D; Alemany, R; Allport, P P; Almehed, S; Amaldi, Ugo; Amato, S; Andersson, P; Andreazza, A; Antilogus, P; Apel, W D; Arnoud, Y; Åsman, B; Augustin, J E; Augustinus, A; Baillon, Paul; Bambade, P; Barão, F; Barbiellini, Guido; Barbier, R; Bardin, Dimitri Yuri; Barker, G; Baroncelli, A; Bärring, O; Battaglia, Marco; Baubillier, M; Becks, K H; Begalli, M; Beillière, P; Belokopytov, Yu A; Benvenuti, Alberto C; Bérat, C; Berggren, M; Bertini, D; Bertrand, D; Besançon, M; Bianchi, F; Bigi, M; Bilenky, S M; Bizouard, M A; Bloch, D; Bonesini, M; Bonivento, W; Boonekamp, M; Booth, P S L; Borgland, A W; Borisov, G; Bosio, C; Botner, O; Boudinov, E; Bouquet, B; Bourdarios, C; Bowcock, T J V; Boyko, I; Bozovic, I; Bozzo, M; Branchini, P; Brand, K D; Brenke, T; Brenner, R A; Brown, R; Brückman, P; Brunet, J M; Bugge, L; Buran, T; Burgsmüller, T; Buschmann, P; Cabrera, S; Caccia, M; Calvi, M; Camacho-Rozas, A J; Camporesi, T; Canale, V; Canepa, M; Carena, F; Carroll, L; Caso, Carlo; Castillo-Gimenez, M V; Cattai, A; Cavallo, F R; Cerruti, C; Chabaud, V; Charpentier, P; Chaussard, L; Checchia, P; Chelkov, G A; Chen, M; Chierici, R; Chliapnikov, P V; Chochula, P; Chorowicz, V; Chudoba, J; Collins, P; Colomer, M; Contri, R; Cortina, E; Cosme, G; Cossutti, F; Cowell, J H; Crawley, H B; Crennell, D J; Crosetti, G; Cuevas-Maestro, J; Czellar, S; D'Almagne, B; Damgaard, G; Davenport, Martyn; Da Silva, W; Deghorain, A; Della Ricca, G; Delpierre, P A; Demaria, N; De Angelis, A; de Boer, Wim; De Brabandere, S; De Clercq, C; De Lotto, B; De Min, A; De Paula, L S; Dijkstra, H; Di Ciaccio, Lucia; Di Diodato, A; Djannati, A; Dolbeau, J; Doroba, K; Dracos, M; Drees, J; Drees, K A; Dris, M; Duperrin, A; Durand, J D; Ehret, R; Eigen, G; Ekelöf, T J C; Ekspong, Gösta; Ellert, M; Elsing, M; Engel, J P; Erzen, B; Espirito-Santo, M C; Falk, E; Fanourakis, G K; Fassouliotis, D; Fayot, J; Feindt, Michael; Fenyuk, A; Ferrari, P; Ferrer, A; Fichet, S; Firestone, A; Fischer, P A; Flagmeyer, U; Föth, H; Fokitis, E; Fontanelli, F; Franek, B J; Frodesen, A G; Frühwirth, R; Fulda-Quenzer, F; Fuster, J A; Galloni, A; Gamba, D; Gandelman, M; García, C; García, J; Gaspar, C; Gaspar, M; Gasparini, U; Gavillet, P; Gazis, E N; Gelé, D; Gerber, J P; Gerdyukov, L N; Ghodbane, N; Gil, I; Glege, F; Gokieli, R; Golob, B; Gonçalves, P; González-Caballero, I; Gopal, Gian P; Gorn, L; Górski, M; Guz, Yu; Gracco, Valerio; Grahl, J; Graziani, E; Green, C; Grefrath, A; Gris, P; Grosdidier, G; Grzelak, K; Günther, M; Guy, J; Hahn, F; Hahn, S; Haider, S; Hallgren, A; Hamacher, K; Harris, F J; Hedberg, V; Heising, S; Henriques, R P; Hernández, J J; Herquet, P; Herr, H; Hessing, T L; Heuser, J M; Higón, E; Holmgren, S O; Holt, P J; Holthuizen, D J; Hoorelbeke, S; Houlden, M A; Hrubec, Josef; Huet, K; Hultqvist, K; Jackson, J N; Jacobsson, R; Jalocha, P; Janik, R; Jarlskog, C; Jarlskog, G; Jarry, P; Jean-Marie, B; Johansson, E K; Jönsson, L B; Jönsson, P E; Joram, C; Juillot, P; Kapusta, F; Karafasoulis, K; Katsanevas, S; Katsoufis, E C; Keränen, R; Khomenko, B A; Khovanskii, N N; King, B J; Kjaer, N J; Klapp, O; Klein, H; Kluit, P M; Knoblauch, D; Kokkinias, P; Koratzinos, M; Kostyukhin, V; Kourkoumelis, C; Kuznetsov, O; Krammer, Manfred; Kreuter, C; Kronkvist, I J; Krstic, J; Krumshtein, Z; Kubinec, P; Kucewicz, W; Kurvinen, K L; Lacasta, C; Lamsa, J; Lanceri, L; Lane, D W; Langefeld, P; Lapin, V; Laugier, J P; Lauhakangas, R; Leder, Gerhard; Ledroit, F; Lefébure, V; Leinonen, L; Leisos, A; Leitner, R; Lemonne, J; Lenzen, Georg; Lepeltier, V; Lesiak, T; Lethuillier, M; Libby, J; Liko, D; Lipniacka, A; Lippi, I; Lörstad, B; Loken, J G; Lopes, J H; López, J M; Loukas, D; Lutz, P; Lyons, L; MacNaughton, J N; Mahon, J R; Maio, A; Malek, A; Malmgren, T G M; Malychev, V; Mandl, F; Marco, J; Marco, R P; Maréchal, B; Margoni, M; Marin, J C; Mariotti, C; Markou, A; Martínez-Rivero, C; Martínez-Vidal, F; Martí i García, S; Matorras, F; Matteuzzi, C; Matthiae, Giorgio; Mazzucato, F; Mazzucato, M; McCubbin, M L; McKay, R; McNulty, R; McPherson, G; Medbo, J; Meroni, C; Myagkov, A; Michelotto, M; Migliore, E; Mirabito, L; Mitaroff, Winfried A; Mjörnmark, U; Moa, T; Møller, R; Mönig, K; Monge, M R; Moreau, X; Morettini, P; Morton, G A; Münich, K; Mulders, M; Mundim, L M; Murray, W J; Muryn, B; Myatt, Gerald; Myklebust, T; Naraghi, F; Navarria, Francesco Luigi; Navas, S; Nawrocki, K; Negri, P; Némécek, S; Neufeld, N; Neumann, W; Neumeister, N; Nicolaidou, R; Nielsen, B S; Nieuwenhuizen, M; Nikolaenko, V; Nikolenko, M; Nomerotski, A; Normand, Ainsley; Nygren, A; Oberschulte-Beckmann, W; Obraztsov, V F; Olshevskii, A G; Onofre, A; Orava, Risto; Orazi, G; Österberg, K; Ouraou, A; Paganini, P; Paganoni, M; Paiano, S; Pain, R; Paiva, R; Palacios, J; Palka, H; Papadopoulou, T D; Papageorgiou, K; Pape, L; Parkes, C; Parodi, F; Parzefall, U; Passeri, A; Pegoraro, M; Peralta, L; Pernegger, H; Pernicka, Manfred; Perrotta, A; Petridou, C; Petrolini, A; Phillips, H T; Piana, G; Pierre, F; Pimenta, M; Piotto, E; Podobnik, T; Podobrin, O; Pol, M E; Polok, G; Poropat, P; Pozdnyakov, V; Privitera, P; Pukhaeva, N; Pullia, Antonio; Radojicic, D; Ragazzi, S; Rahmani, H; Rakoczy, D; Rames, J; Ratoff, P N; Read, A L; Rebecchi, P; Redaelli, N G; Regler, Meinhard; Reid, D; Reinhardt, R; Renton, P B; Resvanis, L K; Richard, F; Rídky, J; Rinaudo, G; Røhne, O M; Romero, A; Ronchese, P; Rosenberg, E I; Rosinsky, P; Roudeau, Patrick; Rovelli, T; Ruhlmann-Kleider, V; Ruiz, A; Saarikko, H; Sacquin, Yu; Sadovskii, A; Sajot, G; Salt, J; Sampsonidis, D; Sannino, M; Schneider, H; Schwemling, P; Schwickerath, U; Schyns, M A E; Scuri, F; Seager, P; Sedykh, Yu; Segar, A M; Sekulin, R L; Shellard, R C; Sheridan, A; Silvestre, R; Simonetto, F; Sissakian, A N; Skaali, T B; Smadja, G; Smirnov, N; Smirnova, O G; Smith, G R; Sopczak, André; Sosnowski, R; Souza-Santos, D; Spassoff, Tz; Spiriti, E; Sponholz, P; Squarcia, S; Stampfer, D; Stanescu, C; Stanic, S; Stapnes, Steinar; Stavitski, I; Stevenson, K; Stocchi, A; Strauss, J; Strub, R; Stugu, B; Szczekowski, M; Szeptycka, M; Tabarelli de Fatis, T; Tegenfeldt, F; Terranova, F; Thomas, J; Tilquin, A; Timmermans, J; Tkatchev, L G; Todorov, T; Todorova, S; Toet, D Z; Tomaradze, A G; Tomé, B; Tonazzo, A; Tortora, L; Tranströmer, G; Treille, D; Tristram, G; Trombini, A; Troncon, C; Tsirou, A L; Turluer, M L; Tyapkin, I A; Tzamarias, S; Überschär, B; Ullaland, O; Uvarov, V; Valenti, G; Vallazza, E; van Apeldoorn, G W; van Dam, P; Van Eldik, J; Van Lysebetten, A; Van Vulpen, I B; Vassilopoulos, N; Vegni, G; Ventura, L; Venus, W A; Verbeure, F; Verlato, M; Vertogradov, L S; Verzi, V; Vilanova, D; Vitale, L; Vlasov, E; Vodopyanov, A S; Vrba, V; Wahlen, H; Walck, C; Weiser, C; Wetherell, Alan M; Wicke, D; Wickens, J H; Wilkinson, G R; Winter, M; Witek, M; Wlodek, T; Wolf, G; Yi, J; Yushchenko, O P; Zalewska-Bak, A; Zalewski, Piotr; Zavrtanik, D; Zevgolatakos, E; Zimin, N I; Zucchelli, G C; Zumerle, G

    1998-01-01

    Using D$^{*+}$ mesons exclusively reconstructed in the DELPHI detector at LEP, an excess of $66\\pm14(\\mbox{stat.})$ events is observed in the D$^{*+}\\pi^+\\pi^-$ final state with a mass of $2637\\pm2(\\mbox{stat.})\\pm6(\\mbox{syst.})$~MeV/$c^2$ and a full width smaller than 15~MeV/$c^2$ (95\\% C.L.). This signal is compatible with the expected decay of a radially excited D$^{*'}$ ($J^P=1^-$) meson.

  5. Azimuthal and Radial Seismic Anisotropy Beneath the Baltic Shield

    Science.gov (United States)

    Pedersen, H. A.; Bruneton, M.; Maupin, V.

    2005-12-01

    The SVEKALAPKO passive seismic array in Finland provides us with an exceptional opportunity to study seismic anisotropy in and below the lithosphere in a shield. The array was composed of almost 150 sensors - out of which 46 were broadband - in a regular 2D grid which facilitated high-quality array analysis. We analyse phase velocities of both Love and Rayleigh waves to constrain radial and azimuthal anisotropy. We invert for the anisotropic parameters ξ and Gc on the one hand, and for the percentage of aligned olivine on the other. This latter parametrization of the inverse problem makes it straightforward to quantitatively compare the radial and the azimuthal anisotropies, under the assumption that aligned olivine dominates the anisotropy. The radial anisotropy, for which we have resolution in the lithosphere only, is strong, and can be explained by 40%-60% of the rock being olivine with the a-axis in the horizontal plane, equivalent to values of ξ between 1.09 and 1.14. This radial anisotropy is stronger than observed in shield areas in global models (e.g. Beghein and Trampert, 2004). The azimuthal anisotropy is on the contrary very small in the lithosphere. This indicates that the orientation of the olivine minerals is random within the horizontal plane or that the overall effect across the area is negligible due to different orientations in different domains. Results from body-waves (Plomerová et al., 2005, Vecsey et al., in prep.) would support the latter interpretation. The azimuthal anisotropy as estimated by Rayleigh wave analysis is on the contrary significant below 200-250km depth, and corresponds to approximately 15%-20% of the rock being olivine with the a-axis aligned in direction N20. Xenolith analysis in the area shows that the rheologic lithosphere is at most 250km thick, so we suggest that this observed anisotropy is sub-lithospheric. Interestingly, the fast direction is significantly different from the absolute plate motion of the Baltic

  6. Gas turbine engine with radial diffuser and shortened mid section

    Science.gov (United States)

    Charron, Richard C.; Montgomery, Matthew D.

    2015-09-08

    An industrial gas turbine engine (10), including: a can annular combustion assembly (80), having a plurality of discrete flow ducts configured to receive combustion gas from respective combustors (82) and deliver the combustion gas along a straight flow path at a speed and orientation appropriate for delivery directly onto the first row (56) of turbine blades (62); and a compressor diffuser (32) having a redirecting surface (130, 140) configured to receive an axial flow of compressed air and redirect the axial flow of compressed air radially outward.

  7. Exact Convex Relaxation of Optimal Power Flow in Radial Networks

    Energy Technology Data Exchange (ETDEWEB)

    Gan, LW; Li, N; Topcu, U; Low, SH

    2015-01-01

    The optimal power flow (OPF) problem determines a network operating point that minimizes a certain objective such as generation cost or power loss. It is nonconvex. We prove that a global optimum of OPF can be obtained by solving a second-order cone program, under a mild condition after shrinking the OPF feasible set slightly, for radial power networks. The condition can be checked a priori, and holds for the IEEE 13, 34, 37, 123-bus networks and two real-world networks.

  8. Numerical solutions of Einstein field equations with radial dark matter

    Science.gov (United States)

    Klimenko, Stanislav; Nikitin, Igor; Nikitina, Lialia

    We study a static spherically symmetric problem with a black hole and radially directed geodesic flows of dark matter. The obtained solutions have the following properties. At large distances, the gravitational field produces constant velocities of circular motion, i.e. flat rotation curves. At smaller distances, the field switches to Newtonian regime, then to Schwarzschild regime. Deviations from Schwarzschild regime start below the gravitational radius. The dark matter prevents the creation of event horizon, instead, a spherical region possessing extremely large redshift is created. The structure of space-time for the obtained solutions is investigated and the implications for the models of the galaxies are discussed.

  9. Measurement of returns to scale in radial DEA models

    Science.gov (United States)

    Krivonozhko, V. E.; Lychev, A. V.; Førsund, F. R.

    2017-01-01

    A general approach is proposed in order to measure returns to scale and scale elasticity at projections points in the radial data envelopment analysis (DEA) models. In the first stage, a relative interior point belonging to the optimal face is found using a special, elaborated method. In previous work it was proved that any relative interior point of a face has the same returns to scale as any other interior point of this face. In the second stage, we propose to determine the returns to scale at the relative interior point found in the first stage.

  10. Radial solutions of equations and inequalities involving the -Laplacian

    Directory of Open Access Journals (Sweden)

    Reichel Wolfgang

    1997-01-01

    Full Text Available Several problems for the differential equation are considered. For , the operator is the radially symmetric -Laplacian in . For the initial value problem with given data various uniqueness conditions and counterexamples to uniqueness are given. For the case where is increasing in , a sharp comparison theorem is established; it leads to maximal solutions, nonuniqueness and uniqueness results, among others. Using these results, a strong comparison principle for the boundary value problem and a number of properties of blow-up solutions are proved under weak assumptions on the nonlinearity .

  11. Application of a proposed overcurrent relay in radial distribution networks

    Energy Technology Data Exchange (ETDEWEB)

    Conde, A.; Vazquez, E. [Universidad Autonoma de Nuevo Leon, Facultad de Ingenieria Mecanica y Electrica, A.P. 36-F, CU, CP 66450, San Nicolas de los Garza, Nuevo Leon (Mexico)

    2011-02-15

    This paper contains the application criteria and coordination process for a proposed overcurrent relay in a radial power system with feed from one or multiple sources. This relay uses independent functions to detect faults and to calculate the operation time. Also this relay uses a time element function that allows it to reduce the time relay operation, enhancing the backup protection. Some of the proposed approaches improve the sensitivity of the relay. The selection of the best approach in the proposed relay is defined by the needs of the application. The proposed protection can be considered as an additional function protection to conventional overcurrent relays. (author)

  12. [Change of self-concept in patients after radial keratotomy].

    Science.gov (United States)

    Toczołowski, J; Oleś, P; Zagórski, Z; Szymona, K; Baltaziak, L; Rymgayłło-Jankowska, B

    2001-01-01

    The study is focused on the problem of self-concept change following radial keratotomy. 25 patients (17 F, 8 M) were investigated 0.5-1.5 year after the surgery by means of the Adjective Check List by Gough and Heilbrun with double instruction concerning actual self-concept (after the surgery) and retrospective self-concept (before the surgery). In the actual self-concept the patients obtained significantly higher results in the following measures: 1) number of positive words used for self description (Fav, p military leadership (Mls, p reason of the differences resolve in higher well being stemming from the surgical correction of vision.

  13. Right radial nerve dysfunction following laparoscopic sigmoid colectomy

    OpenAIRE

    Yoshikazu Takinami; Daisuke Yagi; Masatoshi Morikawa; Masatsugu Yotsuya

    2014-01-01

    Here, we report a case of right radial nerve dysfunction following laparoscopic sigmoid colectomy under general anesthesia. A 75-year-old man was intubated without excessive retroflexion, and his upper body was held in place by lateral body positioners with protective cushions over the chest and acromioclavicular joints. The patient’s head was maintained at the center and held on the operation table with a memory-foam pillow to prevent hyperextension of the neck. The arms, abducted 80° with t...

  14. Surgical management of congenital radial head dislocation: a case report.

    Science.gov (United States)

    Błoński, Marcin; Podgórski, Andrzej; Zakrzewski, Piotr; Pomianowski, Stanisław

    2012-01-01

    Congenital radial head dislocation is a rare condition which is, however, the most common of all congenital pathologies of the elbow joint. This paper is a case report on a patient presenting with moderate pain and discomfort in one of his elbow joints, both of which were found to be affected by this condition. He was treated by surgery which consisted of resection of the proximal radius and partial anterior capsulectomy of the elbow joint. This treatment led to a significant improvement in pain and elbow function compared to the preoperative status.

  15. Doublecortin-like, a microtubule-associated protein expressed in radial glia, is crucial for neuronal precursor division and radial process stability.

    NARCIS (Netherlands)

    Vreugdenhil, E.; Kolk, S.H.; Boekhoorn, K.; Fitzsimons, C.P.; Schaaf, M; Schouten, Th.; Sarabdjitsingh, A.; Sibug, R.; Lucassen, P.J.

    2007-01-01

    During corticogenesis, progenitors divide within the ventricular zone where they rely on radial process extensions, formed by radial glial cell (RG) scaffolds, along which they migrate to the proper layers of the cerebral cortex. Although the microtubule-associated proteins doublecortin (DCX) and

  16. Softverski model estimatora radijalne brzine ciljeva / Software model of a radial velocity estimator

    Directory of Open Access Journals (Sweden)

    Dejan S. Ivković

    2010-04-01

    Full Text Available U radu je softverski modelovan novi blok u delu za obradu signala softverskog radarskog prijemnika, koji je nazvan estimator radijalne brzine. Detaljno je opisan način procene Doplerove frekvencije na osnovu MUSIC algoritma i ukratko prikazan način rada pri merenju. Svi parametri pri merenju klatera i detekcije simuliranih i realnih ciljeva dati su tabelarno, a rezultati grafički. Na osnovu analize prikazanih rezultata može se zaključiti da se pomoću projektovanog estimatora radijalne brzine može precizno proceniti Doplerov pomak u reflektovanom signalu od pokretnog cilja, a samim tim može se precizno odrediti njegova brzina. / In all analyses the MUSIC method has given better results than the FFT method. The MUSIC method proved to be better at estimation precision as well as at resolving two adjacent Doppler frequencies. On the basis of the obtained results, the designed estimator of radial velocity can be said to estimate Doppler frequency in the reflected signal from a moving target precisely, and, consequently, the target velocity. It is thus possible to improve the performances of the current radar as far as a precise estimation of velocity of detected moving targets is concerned.

  17. Measurement of earthworm radial pressures during peristaltic motion

    Science.gov (United States)

    Ruiz, Siul; Or, Dani

    2017-04-01

    Earthworm activity and formation of burrowing networks are important for soil structure formation and transport processes. We developed models for earthworm penetration cavity expansion that consider soil hydration and mechanical status. A key parameter is the maxima axial and radial pressure exerted by the earthworm hydroskeleton (presently estimated at 200 kPa). To test a range of pressures exerted by moving earthworms we developed a coaxial chamber consisting of Plexiglas tube fitted with a thin and inflatable silicon tubing that hosts the earthworm. We pressurize the gap between the Plexiglas and flexible tubing using an incompressible liquid linked to a pressure transducer. Earthworm motion and concurrent pressure were recorded by the transducer and a dedicated video camera. The instrument was calibrated using a cardiac catheter resulting in close agreement between the catheter and chamber pressures. Measurements using anecic earthworms passing across the cylinder show mean radial pressures of 70 kPa, consistent with earlier findings of anecic earthworm pressure measurements using different measurement techniques. Analyses are underway to resolve local pressures induced during peristaltic motion. The study delineates mechanical constraints to soil bioturbation by earthworms for different mechanical conditions including compaction. Tests are underway for direct measurement of plant root pressures during growth.

  18. Total Lip Reconstruction with Tendinofasciocutaneous Radial Forearm Flap

    Directory of Open Access Journals (Sweden)

    Eldad Silberstein

    2014-01-01

    Full Text Available Introduction. Squamous cell carcinoma is a common tumour of lower lip. Small defects created by surgical resection may be readily reconstructed by linear closure or with local flaps. However, large tumours resection often results with microstomia and oral incompetence, drooling, and speech incomprehension. The goal of this study is to describe our experience with composite free radial forearm-palmaris longus tendon flap for total or near total lower lip reconstruction. Patients and Methods. This procedure was used in 5 patients with 80–100% lip defect resulting from Squamous cell carcinoma. Patients’ age ranged from 46 to 82 years. They are three male patients and two female. In 3 cases chin skin was reconstructed as well and in one case a 5 cm segment of mandible was reconstructed using radius bone. In one case where palmaris longus was missing hemi-flexor carpi radialis tendon was used instead. All patients tolerated the procedure well. Results. All flaps totally survived. No patient suffered from drooling. All patients regained normal diet and normal speech. Cosmetic result was fair to good in all patients accept one. Conclusion. We conclude that tendino-fasciocutaneous radial forearm flap for total lower lip reconstruction is safe. Functional and aesthetic result approaches reconstructive goals.

  19. MORPHOLOGICAL ADJUSTMENTS OF THE RADIAL NERVE ARE INTENSITY-DEPENDENT

    Directory of Open Access Journals (Sweden)

    Patrícia Oliva Carbone

    Full Text Available ABSTRACT Introduction: Peripheral nerve adaptation is critical for strength gains. However, information about intensity effects on nerve morphology is scarce. Objective: To compare the effects of different intensities of resistance training on radial nerve structures. Methods: Rats were divided into three groups: control (GC, training with 50% (GF1 and training 75% (GF2 of the animal’s body weight. The morphological analysis of the nerve was done by light and transmission electron microscopy. One-way ANOVA and the Tukey’s post hoc test were applied and the significance level was set at p≤0.05. Results: Training groups had an increase of strength compared to GC (p≤0.05. All measured nerve components (mean area and diameter of myelin fibers and axons, mean area and thickness of the myelin sheath, and of neurofilaments and microtubules were higher in GF2 compared to the other (p≤0.05. Conclusion: Results demonstrated greater morphological changes on radial nerve after heavier loads. This can be important for rehabilitation therapies, training, and progression.

  20. Vehicle Ride Height Change Due To Radial Expansion Of Tires

    Directory of Open Access Journals (Sweden)

    Čavoj Ondřej

    2015-11-01

    Full Text Available In general, tire deformations caused by wheel rotation are not taken into account when developing vehicle aerodynamics. On the road the tires radially expand as speed increases, which affects the actual ride height of a vehicle. In turn this often increases the real aerodynamic drag compared to values obtained using CFD or a wind tunnel as the mass flow across the relatively rough underbody increases with ground clearance. In this study, on-road ride heights were measured while running a vehicle in a straight line with fixed velocity whilst the aerodynamic lift of the vehicle was determined in a wind tunnel. Subsequently, the relationships between ride height and axle load were obtained by loading the vehicle at standstill with ballast. By comparing the ride heights at high and very low velocities with expected vertical displacement caused purely by aerodynamic lift force as computed according to the ride height - axle load equations, the ride height change due to tire radial expansion was determined.

  1. Radial Moment Calculations of Coupled Electron-Photon Beams

    Energy Technology Data Exchange (ETDEWEB)

    FRANKE,BRIAN C.; LARSEN,EDWARD W.

    2000-07-19

    The authors consider the steady-state transport of normally incident pencil beams of radiation in slabs of material. A method has been developed for determining the exact radial moments of 3-D beams of radiation as a function of depth into the slab, by solving systems of 1-D transport equations. They implement these radial moment equations in the ONEBFP discrete ordinates code and simulate energy-dependent, coupled electron-photon beams using CEPXS-generated cross sections. Modified P{sub N} synthetic acceleration is employed to speed up the iterative convergence of the 1-D charged particle calculations. For high-energy photon beams, a hybrid Monte Carlo/discrete ordinates method is examined. They demonstrate the efficiency of the calculations and make comparisons with 3-D Monte Carlo calculations. Thus, by solving 1-D transport equations, they obtain realistic multidimensional information concerning the broadening of electron-photon beams. This information is relevant to fields such as industrial radiography, medical imaging, radiation oncology, particle accelerators, and lasers.

  2. Modeling Marine Electromagnetic Survey with Radial Basis Function Networks

    Directory of Open Access Journals (Sweden)

    Agus Arif

    2014-11-01

    Full Text Available A marine electromagnetic survey is an engineering endeavour to discover the location and dimension of a hydrocarbon layer under an ocean floor. In this kind of survey, an array of electric and magnetic receivers are located on the sea floor and record the scattered, refracted and reflected electromagnetic wave, which has been transmitted by an electric dipole antenna towed by a vessel. The data recorded in receivers must be processed and further analysed to estimate the hydrocarbon location and dimension. To conduct those analyses successfuly, a radial basis function (RBF network could be employed to become a forward model of the input-output relationship of the data from a marine electromagnetic survey. This type of neural networks is working based on distances between its inputs and predetermined centres of some basis functions. A previous research had been conducted to model the same marine electromagnetic survey using another type of neural networks, which is a multi layer perceptron (MLP network. By comparing their validation and training performances (mean-squared errors and correlation coefficients, it is concluded that, in this case, the MLP network is comparatively better than the RBF network[1].[1] This manuscript is an extended version of our previous paper, entitled Radial Basis Function Networks for Modeling Marine Electromagnetic Survey, which had been presented on 2011 International Conference on Electrical Engineering and Informatics, 17-19 July 2011, Bandung, Indonesia.

  3. Modulation of radial blood flow during Braille character discrimination task.

    Science.gov (United States)

    Murata, Jun; Matsukawa, K; Komine, H; Tsuchimochi, H

    2012-03-01

    Human hands are excellent in performing sensory and motor function. We have hypothesized that blood flow of the hand is dynamically regulated by sympathetic outflow during concentrated finger perception. To identify this hypothesis, we measured radial blood flow (RBF), radial vascular conductance (RVC), heart rate (HR), and arterial blood pressure (AP) during Braille reading performed under the blind condition in nine healthy subjects. The subjects were instructed to read a flat plate with raised letters (Braille reading) for 30 s by the forefinger, and to touch a blank plate as control for the Braille discrimination procedure. HR and AP slightly increased during Braille reading but remained unchanged during the touching of the blank plate. RBF and RVC were reduced during the Braille character discrimination task (decreased by -46% and -49%, respectively). Furthermore, the changes in RBF and RVC were much greater during the Braille character discrimination task than during the touching of the blank plate (decreased by -20% and -20%, respectively). These results have suggested that the distribution of blood flow to the hand is modulated via sympathetic nerve activity during concentrated finger perception.

  4. Functionalization of carbon nanotube by carboxyl group under radial deformation

    Energy Technology Data Exchange (ETDEWEB)

    Lara, Ivi Valentini [Pós-Graduação em Física, Universidade Federal de Santa Maria, UFSM, 97105-900 Santa Maria, RS (Brazil); Zanella, Ivana [Área de Ciências Tecnológicas, Centro Universitário Franciscano, 97010-032 Santa Maria, RS (Brazil); Fagan, Solange Binotto, E-mail: ivanazanella@gmail.com [Área de Ciências Tecnológicas, Centro Universitário Franciscano, 97010-032 Santa Maria, RS (Brazil)

    2014-01-15

    Highlights: • Structural and the electronic properties of carboxylated (5,5) single-walled carbon nanotubes (SWNT) under pressure. • sp{sup 3} hybridization induced by the functionalization and/or deformation of SWNT. • Functionalization of SWNT by –COOH under pressure for nanobiotechnological application. - Abstract: The dependence of the structural and the electronic properties of functionalized (5, 5) single-walled carbon nanotubes (SWNT) were investigated through ab initio density functional simulations when the carboxyl group is bonded on the flatter or curved regions. Radial deformations result in diameter decrease of up to 20 per cent of the original size, which was the limit reduction that maintains the SWNT functionalized structure. Changes on the electronic structure were observed due to the symmetry break of the SWNT caused by both the carboxyl group and the C–C bond distortions resulted by the radial deformation. It is observed that the functionalization process is specially favored by the sp{sup 3} hybridization induced on the more curved region of the deformed SWNT.

  5. Right radial nerve dysfunction following laparoscopic sigmoid colectomy

    Directory of Open Access Journals (Sweden)

    Yoshikazu Takinami

    2014-10-01

    Full Text Available Here, we report a case of right radial nerve dysfunction following laparoscopic sigmoid colectomy under general anesthesia. A 75-year-old man was intubated without excessive retroflexion, and his upper body was held in place by lateral body positioners with protective cushions over the chest and acromioclavicular joints. The patient’s head was maintained at the center and held on the operation table with a memory-foam pillow to prevent hyperextension of the neck. The arms, abducted 80° with the forearms supinated, were held in place on the armrests with protective cushions. The surgical position was a 20° head-down lithotomy position with the right side of the body lowered by 15°. Surgery was completed successfully with no complications, and anesthesia time was 7 h and 37 min. After surgery, however, the patient complained of numbness and hypoesthesia on the radial and ulnar side, respectively, of the right arm from the elbow to the fingertips, with the boundary running between fingers 3 and 4. Dysesthesia was observed in the right fingertips of fingers 1–3. After 3 months of silver spike point low-frequency electrotherapy, hypoesthesia improved, while dysesthesia partially improved, in the dorsal area between right fingers 1 and 2.

  6. Inflation and conformal invariance: the perspective from radial quantization

    Energy Technology Data Exchange (ETDEWEB)

    Kehagias, Alex [Physics Division, National Technical University of Athens, 15780 Zografou Campus, Athens (Greece); Theoretical Physics Department, CERN, CH-1211 Geneva 23 (Switzerland); Riotto, Antonio [Department of Theoretical Physics and Center for Astroparticle Physics (CAP) 24 quai E. Ansermet, CH-1211 Geneva 4 (Switzerland)

    2017-05-15

    According to the dS/CFT correspondence, correlators of fields generated during a primordial de Sitter phase are constrained by three-dimensional conformal invariance. Using the properties of radially quantized conformal field theories and the operator-state correspondence, we glean information on some points. The Higuchi bound on the masses of spin-s states in de Sitter is a direct consequence of reflection positivity in radially quantized CFT{sub 3} and the fact that scaling dimensions of operators are energies of states. The partial massless states appearing in de Sitter correspond from the boundary CFT{sub 3} perspective to boundary states with highest weight for the conformal group. Finally, we discuss the inflationary consistency relations and the role of asymptotic symmetries which transform asymptotic vacua to new physically inequivalent vacua by generating long perturbation modes. We show that on the CFT{sub 3} side, asymptotic symmetries have a nice quantum mechanics interpretation. For instance, acting with the asymptotic dilation symmetry corresponds to evolving states forward (or backward) in ''time'' and the charge generating the asymptotic symmetry transformation is the Hamiltonian itself. (copyright 2017 WILEY-VCH Verlag GmbH and Co. KGaA, Weinheim)

  7. Universal symbolic expression for radial distance of conic motion

    Directory of Open Access Journals (Sweden)

    Sharaf M.A.

    2014-01-01

    Full Text Available In the present paper, a universal symbolic expression for radial distance of conic motion in recursive power series form is developed. The importance of this analytical power series representation is that it is invariant under many operations because the result of addition, multiplication, exponentiation, integration, differentiation, etc. of a power series is also a power series. This is the fact that provides excellent flexibility in dealing with analytical, as well as computational developments of problems related to radial distance. For computational developments, a full recursive algorithm is developed for the series coefficients. An efficient method using the continued fraction theory is provided for series evolution, and two devices are proposed to secure the convergence when the time interval (t − t0 is large. In addition, the algorithm does not need the solution of Kepler’s equation and its variants for parabolic and hyperbolic orbits. Numerical applications of the algorithm are given for three orbits of different eccentricities; the results showed that it is accurate for any conic motion.

  8. Adult spinal cord radial glia display a unique progenitor phenotype.

    Directory of Open Access Journals (Sweden)

    Audrey Petit

    Full Text Available Radial glia (RG are primarily embryonic neuroglial progenitors that express Brain Lipid Binding Protein (Blbp a.k.a. Fabp7 and Glial Fibrillary Acidic Protein (Gfap. We used these transcripts to demarcate the distribution of spinal cord radial glia (SCRG and screen for SCRG gene expression in the Allen Spinal Cord Atlas (ASCA. We reveal that neonatal and adult SCRG are anchored in a non-ventricular niche at the spinal cord (SC pial boundary, and express a "signature" subset of 122 genes, many of which are shared with "classic" neural stem cells (NSCs of the subventricular zone (SVZ and SC central canal (CC. A core expressed gene set shared between SCRG and progenitors of the SVZ and CC is particularly enriched in genes associated with human disease. Visualizing SCRG in a Fabp7-EGFP reporter mouse reveals an extensive population of SCRG that extend processes around the SC boundary and inwardly (through the SC white matter (WM, whose abundance increases in a gradient from cervical to lumbar SC. Confocal analysis of multiple NSC-enriched proteins reveals that postnatal SCRG are a discrete and heterogeneous potential progenitor population that become activated by multiple SC lesions, and that CC progenitors are also more heterogeneous than previously appreciated. Gene ontology analysis highlights potentially unique regulatory pathways that may be further manipulated in SCRG to enhance repair in the context of injury and SC disease.

  9. Investigation of gravity waves using horizontally resolved radial velocity measurements

    Science.gov (United States)

    Stober, G.; Sommer, S.; Rapp, M.; Latteck, R.

    2013-10-01

    The Middle Atmosphere Alomar Radar System (MAARSY) on the island of Andøya in Northern Norway (69.3° N, 16.0° E) observes polar mesospheric summer echoes (PMSE). These echoes are used as tracers of atmospheric dynamics to investigate the horizontal wind variability at high temporal and spatial resolution. MAARSY has the capability of pulse-to-pulse beam steering allowing for systematic scanning experiments to study the horizontal structure of the backscatterers as well as to measure the radial velocities for each beam direction. Here we present a method to retrieve gravity wave parameters from these horizontally resolved radial wind variations by applying velocity azimuth display and volume velocity processing. Based on the observations a detailed comparison of the two wind analysis techniques is carried out in order to determine the zonal and meridional wind as well as to measure first-order inhomogeneities. Further, we demonstrate the possibility to resolve the horizontal wave properties, e.g., horizontal wavelength, phase velocity and propagation direction. The robustness of the estimated gravity wave parameters is tested by a simple atmospheric model.

  10. Investigation of gravity waves using horizontally resolved radial velocity measurements

    Directory of Open Access Journals (Sweden)

    G. Stober

    2013-10-01

    Full Text Available The Middle Atmosphere Alomar Radar System (MAARSY on the island of Andøya in Northern Norway (69.3° N, 16.0° E observes polar mesospheric summer echoes (PMSE. These echoes are used as tracers of atmospheric dynamics to investigate the horizontal wind variability at high temporal and spatial resolution. MAARSY has the capability of pulse-to-pulse beam steering allowing for systematic scanning experiments to study the horizontal structure of the backscatterers as well as to measure the radial velocities for each beam direction. Here we present a method to retrieve gravity wave parameters from these horizontally resolved radial wind variations by applying velocity azimuth display and volume velocity processing. Based on the observations a detailed comparison of the two wind analysis techniques is carried out in order to determine the zonal and meridional wind as well as to measure first-order inhomogeneities. Further, we demonstrate the possibility to resolve the horizontal wave properties, e.g., horizontal wavelength, phase velocity and propagation direction. The robustness of the estimated gravity wave parameters is tested by a simple atmospheric model.

  11. Radial velocity planet detection biases at the stellar rotational period

    Science.gov (United States)

    Vanderburg, Andrew; Plavchan, Peter; Johnson, John Asher; Ciardi, David R.; Swift, Jonathan; Kane, Stephen R.

    2016-07-01

    Future generations of precise radial velocity (RV) surveys aim to achieve sensitivity sufficient to detect Earth mass planets orbiting in their stars' habitable zones. A major obstacle to this goal is astrophysical RV noise caused by active areas moving across the stellar limb as a star rotates. In this paper, we quantify how stellar activity impacts exoplanet detection with radial velocities as a function of orbital and stellar rotational periods. We perform data-driven simulations of how stellar rotation affects planet detectability and compile and present relations for the typical time-scale and amplitude of stellar RV noise as a function of stellar mass. We show that the characteristic time-scales of quasi-periodic RV jitter from stellar rotational modulations coincides with the orbital period of habitable-zone exoplanets around early M-dwarfs. These coincident periods underscore the importance of monitoring the targets of RV habitable-zone planet surveys through simultaneous photometric measurements for determining rotation periods and activity signals, and mitigating activity signals using spectroscopic indicators and/or RV measurements at different wavelengths.

  12. Revealing the Radial Effect on Orientation Discrimination by Manual Reaction Time

    Directory of Open Access Journals (Sweden)

    Lixin Liang

    2017-11-01

    Full Text Available It has been shown that the sensitivity and accuracy of orientation perception in the periphery is significantly better when the orientations are radial with respect to the fixation point than when they are tangential. However, since perception and action may be dissociated, it is unclear whether the perceptual radial effect has a counterpart in reaction time (RT of motor responses. Furthermore, it is unknown whether or how stimulus-response-compatibility (SRC effect interacts with the radial effect to determine RT. To address these questions, we measured subjects' manual RT to grating stimuli that appeared across upper visual field (VF. We found that (1 RTs were significantly shorter when a grating was oriented closer to the radial direction than when it was oriented closer to the tangential direction even though the perceptual accuracies for the more radial and more tangential orientations were not significantly different under our experimental condition; (2 This RT version of the radial effect was larger in the left VF than in the right VF; (3 The radial effect and SRC effect interacted with each other to determine the overall RT. These results suggest that the RT radial effect reported here is not a passive reflection of the radial effect in perceptual accuracy, but instead, represents different processing time of radial and tangential orientations along the sensorimotor pathway.

  13. Radial profile and precipitation uniformity of sprinkler NaanDanJain 427, depending on the setting of the deflector

    OpenAIRE

    Martins, Paulo E. S.; José R. Zanini; da Silva, Elcides R. [UNESP; Lemos Filho, Marco A. F.

    2012-01-01

    Neste trabalho o objetivo foi avaliar o perfil radial e a uniformidade de distribuição de água do aspersor fabricado pela empresa NaanDanJain, modelo 427 1/2"M e bocal de 2,8 mm de diâmetro interno, operando com pressões de 150, 200, 300 e 400 kPa em cinco posições do defletor de ajuste (0, 20, 50, 80 e 100%). Para a determinação dos parâmetros avaliados utilizou-se o método da malha e, com o auxílio do aplicativo computacional CATCH 3D, calculou-se a sobreposição das lâminas de água com dez ...

  14. Lente fácica de câmara posterior para correção de hipermetropia consecutiva à ceratotomia radial

    Directory of Open Access Journals (Sweden)

    Salera Cristina Moreira

    2003-01-01

    Full Text Available OBJETIVO: Avaliar a eficácia, previsibilidade e segurança do implante de lente fácica de câmara posterior para a correção de hipermetropia consecutiva à ceratotomia radial. MÉTODOS: Foram analisados retrospectivamente os prontuários de seis pacientes (10 olhos com hipermetropia consecutiva à hipercorreção após ceratotomia radial submetidos ao implante de lente fácica de câmara posterior para sua correção. RESULTADOS: O equivalente esférico pré-operatório médio da refração dinâmica foi de +4,65 dioptrias (variando de +2,50 a +6,50 dioptrias e o equivalente esférico pós-operatório médio foi de +0,3375 dioptrias (variando de -0,875 a +2,25 dioptrias. Quando comparamos as acuidades visuais com correção pré e pós-operatórias observamos que três olhos (30% ganharam duas linhas de acuidade visual, dois (20% ganharam uma linha de acuidade visual, um (10% manteve a mesma acuidade visual, três olhos (30% perderam uma linha de acuidade visual e um olho (10% perdeu duas linhas. CONCLUSÃO: O implante da lente fácica de câmara posterior para correção da hipermetropia consecutiva à ceratotomia radial mostrou-se como uma nova opção para o tratamento desta indesejável complicação, entretanto, fazem-se necessários estudos abrangendo maior número de casos e um acompanhamento a longo prazo destes casos.

  15. Micturating cystourethrography by MR imaging using radial k-space sampling; MR-Miktionszystourethrographie mit radialer k-Raum-Abtastung

    Energy Technology Data Exchange (ETDEWEB)

    Nolte-Ernsting, C.C.A.; Glowinski, A.; Katterbach, F.J.; Adam, G.; Guenther, R.W. [Universitaetsklinikum der RWTH Aachen (Germany). Klinik fuer Radiologische Diagnostik; Rasche, V. [Philips GmbH Forschungslaboratorien, Hamburg (Germany)

    1998-04-01

    Purpose: To investigate the feasibility of micturating cystourethrography (MCU) by means of real-time MR imaging with radial k-space sampling. Results: The proposed technique allowed in all 7 patients a dynamic realtime imaging of the Gd-flow inside the urethra during micturition. The normal anatomy of the entire course of the urethra was demonstrated in each patient, while simultaneously the relation of the prostate and pelvic floor became visible. Furthermore, the urinary bladder could be assessed by interactive repositioning of the slice orientation in any preferred direction. The ureters could also be visualized due to the persisting Gd-enhancement of the upper urinary tract after the preceding MR-urography. (orig./AJ) [Deutsch] Ziel: Untersuchung zur Durchfuehrbarkeit einer Miktionszystourethrographie (MCU) mittels MR-tomographischer Echtzeitdarstellung durch radiale k-Raum-Abtastung. Ergebnisse: Das gewaehlte Verfahren ermoeglichte bei allen 7 Patienten waehrend der Miktion eine dynamische Echtzeitdarstellung der Gd-Anflutung innerhalb der Harnroehre. Die normale Anatomie der Urethra konnte jeweils im gesamten Verlauf beurteilt werden, wobei gleichzeitig der Bezug zu Prostata und Beckenboden sichtbar wurde. Durch eine interaktive Umpositionierung der Messschicht in jeder gewuenschten Ebene liess sich die Harnblase bequem mituntersuchen sowie ebenfalls auch die Ureteren, die durch die vorausgegangene Urographie noch mit Gd angefuellt waren. (orig./AJ)

  16. Radial Equilibrium of Extended Object in a Circular Orbit

    Directory of Open Access Journals (Sweden)

    V. V. Korovin

    2016-01-01

    Full Text Available Over the past decades the problems in mechanics of orbital motion and equilibrium of extended objects draw attention of domestic and foreign experts because of their interest in such projects as the space tether systems and space elevators.The article deals with the nonlinear equations of equilibrium one-dimensional objects in a central gravitational field in a circular orbit. It considers transition from the material point to the objects in the form of dumbbells, a homogeneous rod, and a type of garland. It is shown that the motion of the mass center of these objects is non-Keplerian. In some cases the analytical expressions of the angular velocity of the center of mass are obtained.A point of the object extended in the radial direction, called the orbital center, has a Keplerian angular velocity. The orbital center is characterized by a zero gravity and a maximum of the tension force. The orbital center is always below the center of mass.The gravitation-centrifugal forces provide stretching the extended object in orbit. The analytic expressions for the tension force in typical cases have been received, and their properties have been analyzed. The article shows the nature and acceleration value in the sections of the radially extended objects of acceleration that is determined by difference between gravitational and centrifugal forces.The article offers to consider a gravitation-centrifugal load, which acts on the extended object, as the self-balanced system of forces of the apparent weight with the variable apparent acceleration along a radius. This gives a simple general formula for determining the tensile force in the cross sections of the radially oriented one-dimensional objects.The calculation of the simplest space elevator has been fulfilled. Provided that there is a lack of compressive stresses, have been determined the minimum length of an elevator as a homogeneous rod, distribution of the tensile force by length, and requirements for

  17. Surgical management of radial head luxation in a dog using an external skeletal traction device.

    Science.gov (United States)

    Fitzpatrick, N; Yeadon, R; Farrell, M

    2013-01-01

    A five-month-old Airedale Terrier was presented with a history of right thoracic limb lameness. Clinical and radiographic examinations revealed caudolateral luxation of the right radial head. Surgical intervention involved an oblique proximal radial osteotomy and gradual craniomedial traction of the radial head using an external skeletal fixator (ESF) incorporating a traction device. The radial head was gradually reduced over 16 days. After radiographic confirmation of appropriate radial head reduction, a consolidation phase followed, with removal of the traction ESF after 24 days. Follow-up radiographs documented remodelling of the radial head. Clinical follow-up three years postoperatively revealed nearly normal ground reaction forces. Activity was unrestricted and there was no requirement for analgesic medications.

  18. Possible role of external radial electric field on ion heating in an FRC

    Science.gov (United States)

    Gupta, Deepak; Trask, E.; Korepanov, S.; Granstedt, E.; Osin, D.; Roche, T.; Deng, B.; Beall, M.; Zhai, K.; TAE Team

    2016-10-01

    In C-2/C-2U FRCs, a radial electric field is applied by either plasma guns or biased electrodes inside the divertors, at both ends of the machine. The electric field plays an important role in stabilizing the FRC; thus, providing a favorable target condition to a neutral beam injection. In addition, it is also observed that the application of radial electric field may lead to a heating of ions. Radial profile of impurity ion emission, azimuthal velocity and temperature are measured under different configurations. The conditions and evidences of ion heating due to the electric field biasing will be presented and discussed. Radial momentum balance equation of oxygen impurity ions is used with these measurements to estimate the radial electric field profile. Parameters affecting the ion heating due to biasing will also be discussed with some correlations. The external radial electric field is planned to be applied by biased electrodes and plasma guns in C-2W inner/outer divertors.

  19. Clinical and Radiographic Outcomes of Unipolar and Bipolar Radial Head Prosthesis in Patients with Radial Head Fracture: A Systemic Review and Meta-Analysis.

    Science.gov (United States)

    Chen, Hongwei; Wang, Ziyang; Shang, Yongjun

    2017-09-13

    To compare clinical outcomes of unipolar and bipolar radial head prosthesis in the treatment of patients with radial head fracture. Medline, Cochrane, EMBASE, Google Scholar databases were searched until April 18, 2016 using the following search terms: radial head fracture, elbow fracture, radial head arthroplasty, implants, prosthesis, unipolar, bipolar, cemented, and press-fit. Randomized controlled trials, retrospective, and cohort studies were included. The Mayo elbow performance score (MEPS), disabilities of the arm, shoulder, and hand (DASH) score, radiologic assessment, ROM, and grip strength following elbow replacement were similar between prosthetic devices. The pooled mean excellent/good ranking of MEPS was 0.78 for unipolar and 0.73 for bipolar radial head arthroplasty, and the pooled mean MEPS was 86.9 and 79.9, respectively. DASH scores for unipolar and bipolar prosthesis were 19.0 and 16.3, respectively. Range of motion outcomes were similar between groups, with both groups have comparable risk of flexion arc, flexion, extension deficit, rotation arc, pronation, and supination (p values bipolar prosthesis). However, bipolar radial head prosthesis was associated with an increased chance of heterotopic ossification and lucency (p values ≤0.049) while unipolar prosthesis was not (p values ≥0.088). Both groups had risk for development of capitellar osteopenia or erosion/wear (p values ≤0.039). Unipolar and bipolar radial head prostheses were similar with respect to clinical outcomes. Additional comparative studies are necessary to further compare different radial head prostheses used to treat radial head fracture.

  20. Testing Verlinde's emergent gravity with the radial acceleration relation

    Science.gov (United States)

    Lelli, Federico; McGaugh, Stacy S.; Schombert, James M.

    2017-06-01

    It has recently been proposed that space-time and gravity may emerge from an underlying microscopic theory. In a de Sitter space-time, such emergent gravity (EG) contains an additional gravitational force due to dark energy, which may explain the mass discrepancies observed in galactic systems without the need of dark matter. For a point mass, EG is equivalent to Modified Newtonian Dynamics (MOND). We show that this equivalence does not hold for finite-size galaxies: There are significant differences between EG and MOND in the inner regions of galaxies. We confront theoretical predictions with the empirical radial acceleration relation (RAR). We find that (I) EG is consistent with the observed RAR only if we substantially decrease the fiducial stellar mass-to-light ratios; the resulting values are in tension with other astronomical estimates; (II) EG predicts that the residuals around the RAR should correlate with radius; such residual correlation is not observed.

  1. Radial and directional solidification of metallic systems in space

    Science.gov (United States)

    Katamis, T. Z.; Douglas, F. C.; Galasso, F. S.

    1974-01-01

    Investigation of the solidification behavior of spherical specimens of Ni-12 wt % Sn and Ni-1 wt % Ag that froze radially from the surface toward the center and cylindrical specimens of Al-33 wt % Cu eutectic that froze directionally under appropriately selected conditions of thermal gradient at the solid-liquid interface and growth rate. Possible effects of vacuum and low gravity conditions, under which the spherical specimens were processed, on observed nucleation and growth phenomena are discussed. A genetic explanation is given of observed microstructures, and the distributions of alloying elements is discussed. In directionally solidified eutectic specimens a comparison is made between statistically evaluated growth defects in Skylab and in ground specimens.

  2. Bok Prize Lecture (shared) The Brown Dwarf Radial Velocity Survey

    Science.gov (United States)

    Charbonneau, Dave

    2004-03-01

    The swarm of nearby brown dwarfs and very low mass stars is an attractive sample for radial velocity monitoring. Such work is best conducted with an echelle spectrograph operating at infrared wavelengths where these objects(i) are most luminous, (ii) have a forest of molecular features, providing an excellent velocity metric, and {iii) are superimposed on the telluric spectrum, which yields the requisite wavelength calibration. I will present first results from such a survey, with a precision sufficient to detect Jupiter-mass planets with orbital periods of less than a year. Should such systems be uncovered, the planets would be amenable to direct study, due to system proximity, and the favorable contrast ratio between the planet and parent object.

  3. Optimal strategies of radial velocity observations in planet search surveys

    Science.gov (United States)

    Baluev, Roman V.

    2008-09-01

    Applications of the theory of optimal design of experiments to radial velocity (RV) planet search surveys are considered. Different optimality criteria are discussed, basing on the Fisher, Shannon and Kullback-Leibler informations. Algorithms of optimal scheduling of RV observations for two important practical problems are considered. The first problem is finding the time for future observations to yield the maximum improvement of the precision of exoplanetary orbital parameters and masses. The second problem is finding the most favourable time for distinguishing alternative orbital fits (the scheduling of discriminating observations). These methods of optimal planning are demonstrated to be potentially efficient for multiplanet extrasolar systems, in particular for resonant ones. In these cases, the optimal dates of observations are often concentrated in quite narrow time segments.

  4. A Novel Design of Magnetorheological Damper with Annular Radial Channel

    Directory of Open Access Journals (Sweden)

    Shisha Zhu

    2016-01-01

    Full Text Available With the development of automotive vibration technology, the semiactive suspension system with adjustable damping force and high reliability is taken seriously. The magnetorheological damper (MRD that applies intelligent material (magnetorheological fluid is the key element of this system. It can achieve a continuous and adjustable damping and then reaches the purpose of comfort. In order to improve the damping effect of MRD, this paper presents a MRD, which has magnetorheological (MR effect along annular radial channel. The paper completely designs the structure and magnetic circuit of MRD. Based on the theory of electromagnetism and MR fluid dynamics, the paper analyzes and tests the external characteristics of the MRD by the MATLAB/Simulink and the vibration experiment. The results compared with ordinary MRD reveal that the damping force obviously increases and has wide adjustable range, thus verifying the reasonableness of the damper design.

  5. Efficient VLSI Architecture for Training Radial Basis Function Networks

    Science.gov (United States)

    Fan, Zhe-Cheng; Hwang, Wen-Jyi

    2013-01-01

    This paper presents a novel VLSI architecture for the training of radial basis function (RBF) networks. The architecture contains the circuits for fuzzy C-means (FCM) and the recursive Least Mean Square (LMS) operations. The FCM circuit is designed for the training of centers in the hidden layer of the RBF network. The recursive LMS circuit is adopted for the training of connecting weights in the output layer. The architecture is implemented by the field programmable gate array (FPGA). It is used as a hardware accelerator in a system on programmable chip (SOPC) for real-time training and classification. Experimental results reveal that the proposed RBF architecture is an effective alternative for applications where fast and efficient RBF training is desired. PMID:23519346

  6. Stability Analysis of Radial Turning Process for Superalloys

    Science.gov (United States)

    Jiménez, Alberto; Boto, Fernando; Irigoien, Itziar; Sierra, Basilio; Suarez, Alfredo

    2017-09-01

    Stability detection in machining processes is an essential component for the design of efficient machining processes. Automatic methods are able to determine when instability is happening and prevent possible machine failures. In this work a variety of methods are proposed for detecting stability anomalies based on the measured forces in the radial turning process of superalloys. Two different methods are proposed to determine instabilities. Each one is tested on real data obtained in the machining of Waspalloy, Haynes 282 and Inconel 718. Experimental data, in both Conventional and High Pressure Coolant (HPC) environments, are set in four different states depending on materials grain size and Hardness (LGA, LGS, SGA and SGS). Results reveal that PCA method is useful for visualization of the process and detection of anomalies in online processes.

  7. Conformable heat equation on a radial symmetric plate

    Directory of Open Access Journals (Sweden)

    Avci Derya

    2017-01-01

    Full Text Available The conformable heat equation is defined in terms of a local and limit-based definition called conformable derivative which provides some basic properties of integer order derivative such that conventional fractional derivatives lose some of them due to their non-local structures. In this paper, we aim to find the fundamental solution of a conformable heat equation acting on a radial symmetric plate. Moreover, we give a comparison between the new conformable and the existing Grunwald-Letnikov solutions of heat equation. The computational results show that conformable formulation is quite successful to show the sub-behaviors of heat process. In addition, conformable solution can be obtained by a analytical method without the need of a numerical scheme and any restrictions on the problem formulation. This is surely a significant advantageous compared to the Grunwald-Letnikov solution.

  8. Principle of radial transport in low temperature annular plasmas

    Energy Technology Data Exchange (ETDEWEB)

    Zhang, Yunchao, E-mail: yunchao.zhang@anu.edu.au; Charles, Christine; Boswell, Rod [Space Plasma, Power and Propulsion Laboratory, Research School of Physics and Engineering, The Australian National University, Bldg 60, Mills Road, Australian Capital Territory 2601 (Australia)

    2015-07-15

    Radial transport in low temperature annular plasmas is investigated theoretically in this paper. The electrons are assumed to be in quasi-equilibrium due to their high temperature and light inertial mass. The ions are not in equilibrium and their transport is analyzed in three different situations: a low electric field (LEF) model, an intermediate electric field (IEF) model, and a high electric field (HEF) model. The universal IEF model smoothly connects the LEF and HEF models at their respective electric field strength limits and gives more accurate results of the ion mobility coefficient and effective ion temperature over the entire electric field strength range. Annular modelling is applied to an argon plasma and numerical results of the density peak position, the annular boundary loss coefficient and the electron temperature are given as functions of the annular geometry ratio and Paschen number.

  9. Radial Basis Function Networks for Conversion of Sound Spectra

    Directory of Open Access Journals (Sweden)

    Carlo Drioli

    2001-03-01

    Full Text Available In many advanced signal processing tasks, such as pitch shifting, voice conversion or sound synthesis, accurate spectral processing is required. Here, the use of Radial Basis Function Networks (RBFN is proposed for the modeling of the spectral changes (or conversions related to the control of important sound parameters, such as pitch or intensity. The identification of such conversion functions is based on a procedure which learns the shape of the conversion from few couples of target spectra from a data set. The generalization properties of RBFNs provides for interpolation with respect to the pitch range. In the construction of the training set, mel-cepstral encoding of the spectrum is used to catch the perceptually most relevant spectral changes. Moreover, a singular value decomposition (SVD approach is used to reduce the dimension of conversion functions. The RBFN conversion functions introduced are characterized by a perceptually-based fast training procedure, desirable interpolation properties and computational efficiency.

  10. Ripple formation on nickel irradiated with radially polarized femtosecond beams

    Science.gov (United States)

    Tsibidis, George D.; Skoulas, Evangelos; Stratakis, Emmanuel

    2015-11-01

    We report on the morphological effects induced by the inhomogeneous absorption of radially polarized femtosecond laser irradiation of nickel (Ni) in sub-ablation conditions. A theoretical prediction of the morphology profile is performed and the role of surface plasmon excitation in the production of self-formed periodic ripples structures is evaluated. Results indicate a smaller periodicity of the ripples profile compared to that attained under linearly polarized irradiation conditions. A combined hydrodynamical and thermoelastic model is presented in laser beam conditions that lead to material melting. The simulation results are presented to be in good agreement with the experimental findings. The ability to control the size of the morphological changes via modulating the beam polarization may provide an additional route for controlling and optimizing the outcome of laser micro-processing

  11. Reformulated radial basis neural networks trained by gradient descent.

    Science.gov (United States)

    Karayiannis, N B

    1999-01-01

    This paper presents an axiomatic approach for constructing radial basis function (RBF) neural networks. This approach results in a broad variety of admissible RBF models, including those employing Gaussian RBF's. The form of the RBF's is determined by a generator function. New RBF models can be developed according to the proposed approach by selecting generator functions other than exponential ones, which lead to Gaussian RBF's. This paper also proposes a supervised learning algorithm based on gradient descent for training reformulated RBF neural networks constructed using the proposed approach. A sensitivity analysis of the proposed algorithm relates the properties of RBF's with the convergence of gradient descent learning. Experiments involving a variety of reformulated RBF networks generated by linear and exponential generator functions indicate that gradient descent learning is simple, easily implementable, and produces RBF networks that perform considerably better than conventional RBF models trained by existing algorithms.

  12. Variable area radial turbine fabrication and test program

    Science.gov (United States)

    Rogo, C.

    1986-01-01

    A variable area radial turbine with a moveable nozzle sidewall was experimentally evaluated. The turbine was designed for an advanced variable capacity gas turbine rotorcraft engine. The turbine has a mass flow rate of 2.27 kg/sec (5.0 lbs/sec), and a rotor inlet temperature of 1477K (2200 F). Testing was conducted at a reduced inlet temperature, but the aerodynamic parameters and Reynolds numbers were duplicated. Overall performance was obtained for a range of nozzle areas from 50% to 100% of the maximum area. The test program determined the effect on performance of: (1) Moving the hub or shroud sidewall; (2) Sidewall-vane clearance leakage; (3) Vaneless space geometry change; and (4) Nozzle cooling flows. Data were obtained for a range of pressure ratios and speeds and are presented in a number of performance maps.

  13. Fast imaging of mean, axial and radial diffusion kurtosis

    DEFF Research Database (Denmark)

    Hansen, Brian; Shemesh, Noam; Jespersen, Sune Nørhøj

    2016-01-01

    Abstract Diffusion kurtosis imaging (DKI) is being increasingly reported to provide sensitive biomarkers of subtle changes in tissue microstructure. However, DKI also imposes larger data requirements than diffusion tensor imaging (DTI), hence, the widespread adaptation and exploration of DKI would...... benefit from more efficient acquisition and computational methods. To meet this demand, we recently developed a method capable of estimating mean kurtosis with only 13 diffusion weighted images. This approach was later shown to provide very accurate mean kurtosis estimates and to be more efficient......'s principal parameters – mean kurtosis, radial kurtosis, and axial kurtosis – using only 19 diffusion weighted images, compared to the current state-of-the-art acquisitions typically requiring about 60 images. The first approach is based on axially symmetric diffusion and kurtosis tensors, presented here...

  14. STABILITY ANALYSIS OF RADIAL TURNING PROCESS FOR SUPERALLOYS

    Directory of Open Access Journals (Sweden)

    Alberto JIMÉNEZ

    2017-07-01

    Full Text Available Stability detection in machining processes is an essential component for the design of efficient machining processes. Automatic methods are able to determine when instability is happening and prevent possible machine failures. In this work a variety of methods are proposed for detecting stability anomalies based on the measured forces in the radial turning process of superalloys. Two different methods are proposed to determine instabilities. Each one is tested on real data obtained in the machining of Waspalloy, Haynes 282 and Inconel 718. Experimental data, in both Conventional and High Pressure Coolant (HPC environments, are set in four different states depending on materials grain size and Hard-ness (LGA, LGS, SGA and SGS. Results reveal that PCA method is useful for visualization of the process and detection of anomalies in online processes.

  15. New constraints on Earth’s radial conductivity structure

    DEFF Research Database (Denmark)

    Püthe, C.; Kuvshinov, A.; Olsen, Nils

    2014-01-01

    We present a new model of Earth’s radial (1-D) conductivity structure at depths between 10 km and the core-mantle boundary. It is based on CM5, the latest version in the Comprehensive Model series that has been derived using 13 years (September 2000 to September 2013) of magnetic data collected...... these coefficients. An iterative approach is used to correct the estimated responses for 3-D effects arising from lateral heterogeneities in the top 10 km. The corrected Q-responses are converted to C-responses; the latter are subsequently inverted for the layered 1-D mantle conductivity profile with the Newton...... method. The Hessian matrix of the misfit function, which is derived analytically, is used to estimate confidence limits for the conductivity of each layer. The resulting conductivity-depth profile is compared to 1-D conductivity models of Earth’s mantle recovered in previous studies....

  16. Control point selection for dimensionality reduction by radial basis function

    Directory of Open Access Journals (Sweden)

    Kotryna Paulauskienė

    2016-02-01

    Full Text Available This research deals with dimensionality reduction technique which is based on radial basis function (RBF theory. The technique uses RBF for mapping multidimensional data points into a low-dimensional space by interpolating the previously calculated position of so-called control points. This paper analyses various ways of selection of control points (regularized orthogonal least squares method, random and stratified selections. The experiments have been carried out with 8 real and artificial data sets. Positions of the control points in a low-dimensional space are found by principal component analysis. We demonstrate that random and stratified selections of control points are efficient and acceptable in terms of balance between projection error (stress and time-consumption.DOI: 10.15181/csat.v4i1.1095

  17. Velocidad radial de Blue Stragglers en cúmulos abiertos

    Science.gov (United States)

    González, J. F.; Lapasset, E.

    Se presentan observaciones espectroscópicas de 32 blue stragglers en 6 cúmulos abiertos. Un mínimo de 4 espectros por objeto fueron obtenidos en base a los cuales se determina tipo espectral, velocidad radial y velocidad de rotación proyectada. La comparación con la velocidad media de los cúmulos aseguraría una alta probabilidad de pertenencia para la mayoría de los objetos estudiados. Un análisis de variabilidad conduce a la detección de un nuevo blue straggler binario en el cúmulo NGC 6530 además de otras probables binarias. En base a la frecuencia de binaridad y a la distribución de velocidades rotacionales se discuten los probables mecanismos de formación de los blue stragglers.

  18. Radial cytoarchitecture and patterns of cortical connectivity in autism.

    Science.gov (United States)

    Casanova, Manuel; Trippe, Juan

    2009-05-27

    To explain the pattern of preserved and superior abilities found in autism spectrum disorders, a hypothesis has emerged, which assumes that there is a developmental bias towards the formation of short-range connections. This would result in excessive activity and overconnectivity within susceptible local networks. These networks might become partially isolated and acquire novel functional properties. In turn, this would affect the formation of long-range circuits and systems governing top-down control and integration. Despite many tantalizing clues, mechanisms relating pathogenesis and altered cell function to the 'disconnection' of integrative and focal activity remain obscure. However, recent post-mortem studies of brains of individuals with autism have shown characteristic differences in the morphometry of radial cell minicolumns, which add credence to the connectivity hypothesis.

  19. Radial artery occlusion after transradial approach to cardiac catheterization.

    Science.gov (United States)

    Wagener, John F; Rao, Sunil V

    2015-03-01

    Radial artery occlusion (RAO) is the most common complication of the transradial approach (TRA) to cardiac catheterization, with a reported incidence between 0.8 % and 30 %. RAO is likely the result of acute thrombus formation and complicated by neointimal hyperplasia. Most RAO are asymptomatic with rare cases of acute hand or digit ischemia reported in the literature. The role of testing for dual circulation to the hand in determining the safety of TRA as it relates to symptomatic RAO is controversial; however, modifiable risk factors like low sheath-to-artery ratio, adequate anticoagulation, and non-occlusive ("patent") hemostasis are likely to prevent RAO. This review examines the incidence of RAO, potential mechanisms leading to RAO, and strategies to prevent and treat RAO.

  20. La guerra radial entre EE. UU. y Cuba

    Directory of Open Access Journals (Sweden)

    Howard H, Frederick

    2015-01-01

    Full Text Available La radiodifusión desempeña un papel importante en las relaciones internacionales contemporáneas. En algunas ocasiones, la comunicación entre naciones a través de servicios radales externos ha tenido un gran impacto sobre el devenir de los acontecimientos internacionales. En la actualidad, en todo el espectro radial del mundo, adversarios ardorosos luchan por los corazones y las mentes de públicos atentos. Esta “lucha internacional de ideas” no muestra síntoma  alguno de moderarse. En verdad, más de ochenta países emiten diariamente más de veintidós mil horas de programación internacional a más de 250 millones de oyentes.

  1. Macro-modelling via radial basis functionen nets

    Science.gov (United States)

    Wiegand, C.; Fischer, C.; Kazemzadeh, R.; Hedayat, C.; John, W.; Hilleringmann, U.

    2008-05-01

    By the rising complexity and miniaturisation of the device's dimensions, the density of the conductors increases considerably. Referring to this, locally transient interactions between single physical values become apparent. Therefore, for the investigation and optimisation of integrated circuits it is essential to develop suitable models and simulation surroundings which allow for memory and time-efficient calculation of the behaviour. By means of the dynamic reconstruction theory and the radial basis functions nets the so-called black box models are provided. The description of black box models is derived from the input and output behaviour or so-called time series of a dynamic system. Concerning the time series, the black box model adapts its parameters via the extended Kalman filter. This paper provides a modelling approach that enables fast and efficient simulations.

  2. Macro-modelling via radial basis functionen nets

    Directory of Open Access Journals (Sweden)

    C. Wiegand

    2008-05-01

    Full Text Available By the rising complexity and miniaturisation of the device's dimensions, the density of the conductors increases considerably. Referring to this, locally transient interactions between single physical values become apparent. Therefore, for the investigation and optimisation of integrated circuits it is essential to develop suitable models and simulation surroundings which allow for memory and time-efficient calculation of the behaviour. By means of the dynamic reconstruction theory and the radial basis functions nets the so-called black box models are provided. The description of black box models is derived from the input and output behaviour or so-called time series of a dynamic system. Concerning the time series, the black box model adapts its parameters via the extended Kalman filter. This paper provides a modelling approach that enables fast and efficient simulations.

  3. Regulation of radial glial survival by signals from the meninges

    Science.gov (United States)

    Radakovits, Randor; Barros, Claudia S.; Belvindrah, Richard; Patton, Bruce; Müller, Ulrich

    2009-01-01

    Summary Radial glial cells (RGCs) in the developing cerebral cortex are progenitors for neurons and glia and their processes serve as guideposts for migrating neurons. So far, it has remained unclear whether RGC processes also control the function of RGCs more directly. Here we show that RGC numbers and cortical size are reduced in mice lacking β1 integrins in RGCs. TUNEL stainings and time-lapse video recordings demonstrate that β1-deficient RGCs processes detach from the meningeal BM followed by apoptotic death of RGCs. Apoptosis is also induced by surgical removal of the meninges. Finally, mice lacking the BM components laminin α2 and α4 show defects in the attachment of RGC processes at the meninges, a reduction in cortical size, and enhanced apoptosis of RGC cells. Our findings demonstrate that attachment of RGC processes at the meninges is important for RGC survival and the control of cortical size. PMID:19535581

  4. Interplay between Mach cone and radial expansion in jet events

    Energy Technology Data Exchange (ETDEWEB)

    Tachibana, Y., E-mail: tachibana@nt.phys.s.u-tokyo.ac.jp [Theoretical Research Division, Nishina Center, RIKEN, Wako 351-0198 (Japan); Department of Engineering, Nishinippon Institute of Technology, Fukuoka 800-0344 (Japan); Department of Physics, Sophia University, Tokyo 102-8554 (Japan); Hirano, T., E-mail: hirano@sophia.ac.jp [Department of Physics, Sophia University, Tokyo 102-8554 (Japan)

    2016-12-15

    We study the hydrodynamic response to jet propagation in the expanding QGP and investigate how the particle spectra after the hydrodynamic evolution of the QGP reflect it. We perform simulations of the space-time evolution of the QGP in gamma-jet events by solving (3+1)-dimensional ideal hydrodynamic equations with source terms. Mach cone is induced by the jet energy deposition and pushes back the radial flow of the expanding background. Especially in the case when the jet passage is off-central one, the number of particles emitted in the direction of the push back decreases. This is the signal including the information about the formation of the Mach cone and the jet passage in the QGP fluid.

  5. Mass spectrum and decay constants of radially excited vector mesons

    Science.gov (United States)

    Mojica, Fredy F.; Vera, Carlos E.; Rojas, Eduardo; El-Bennich, Bruno

    2017-07-01

    We calculate the masses and weak decay constants of flavorless and flavored ground and radially excited JP=1- mesons within a Poincaré covariant continuum framework based on the Bethe-Salpeter equation. We use in both the quark's gap equation and the meson bound-state equation an infrared massive and finite interaction in the leading symmetry-preserving truncation. While our numerical results are in rather good agreement with experimental values where they are available, no single parametrization of the QCD inspired interaction reproduces simultaneously the ground and excited mass spectrum, which confirms earlier work on pseudoscalar mesons. This feature being a consequence of the lowest truncation, we pin down the range and strength of the interaction in both cases to identify common qualitative features that may help to tune future interaction models beyond the rainbow-ladder approximation.

  6. On the radial oxygen distribution in the Galactic disc

    Science.gov (United States)

    Mishurov, Yu. N.; Tkachenko, R. V.

    2018-01-01

    The binned oxygen distribution, derived using new Cepheid observations, demonstrates wriggling radial pattern with different gradients in various ranges of Galactic radius, in particular a plateau distribution within 7 ≲ r ≲ 9 kpc (for the solar distance r⊙ = 7.9 kpc) where the mean Galactic abundance is about 0.2 dex higher than the solar one. Our modelling of oxygen synthesis in the Galactic disc is based on the refine theory that takes into account the combined effect of corotation resonance and turbulent diffusion on the disc enrichment. The theory fits to observations best of all if the time-scale (t_f=-f/\\dot{f}) of gas infall rate f(r, t) (where r and t are the Galactocentric radius and time, respectively) on to the disc is tf ∼ 2-3 Gyr whereas the fit is the worst if tf ∼ 6 Gyr (the last means that the high rate of gas infall at present epoch ∼1.5 M⊙ yr-1 does not satisfy the observed oxygen radial distribution). For inside-out scenario, further studies are necessary. Using the derived mean masses of newly synthesized oxygen ejected per core-collapsed supernova and theoretical oxygen yields, we compute the initial upper masses, mU, of stars that can explode as core-collapsed supernovae. Our estimates show that if tf ∼ 2 Gyr in the framework of rotating stars, their mU are no more than 24 M⊙, but if tf ∼ 3 Gyr in model of rotating stars or in the case of non-rotating star mU can be as high as 40-50 M⊙ like Wolf-Rayet stars that are considered as candidates for Types Ib/c supernovae.

  7. Neuronal spike sorting based on radial basis function neural networks

    Directory of Open Access Journals (Sweden)

    Taghavi Kani M

    2011-02-01

    Full Text Available "nBackground: Studying the behavior of a society of neurons, extracting the communication mechanisms of brain with other tissues, finding treatment for some nervous system diseases and designing neuroprosthetic devices, require an algorithm to sort neuralspikes automatically. However, sorting neural spikes is a challenging task because of the low signal to noise ratio (SNR of the spikes. The main purpose of this study was to design an automatic algorithm for classifying neuronal spikes that are emitted from a specific region of the nervous system."n "nMethods: The spike sorting process usually consists of three stages: detection, feature extraction and sorting. We initially used signal statistics to detect neural spikes. Then, we chose a limited number of typical spikes as features and finally used them to train a radial basis function (RBF neural network to sort the spikes. In most spike sorting devices, these signals are not linearly discriminative. In order to solve this problem, the aforesaid RBF neural network was used."n "nResults: After the learning process, our proposed algorithm classified any arbitrary spike. The obtained results showed that even though the proposed Radial Basis Spike Sorter (RBSS reached to the same error as the previous methods, however, the computational costs were much lower compared to other algorithms. Moreover, the competitive points of the proposed algorithm were its good speed and low computational complexity."n "nConclusion: Regarding the results of this study, the proposed algorithm seems to serve the purpose of procedures that require real-time processing and spike sorting.

  8. Ultra-selective looming detection from radial motion opponency.

    Science.gov (United States)

    Klapoetke, Nathan C; Nern, Aljoscha; Peek, Martin Y; Rogers, Edward M; Breads, Patrick; Rubin, Gerald M; Reiser, Michael B; Card, Gwyneth M

    2017-11-08

    Nervous systems combine lower-level sensory signals to detect higher-order stimulus features critical to survival, such as the visual looming motion created by an imminent collision or approaching predator. Looming-sensitive neurons have been identified in diverse animal species. Different large-scale visual features such as looming often share local cues, which means loom-detecting neurons face the challenge of rejecting confounding stimuli. Here we report the discovery of an ultra-selective looming detecting neuron, lobula plate/lobula columnar, type II (LPLC2) in Drosophila, and show how its selectivity is established by radial motion opponency. In the fly visual system, directionally selective small-field neurons called T4 and T5 form a spatial map in the lobula plate, where they each terminate in one of four retinotopic layers, such that each layer responds to motion in a different cardinal direction. Single-cell anatomical analysis reveals that each arm of the LPLC2 cross-shaped primary dendrites ramifies in one of these layers and extends along that layer's preferred motion direction. In vivo calcium imaging demonstrates that, as their shape predicts, individual LPLC2 neurons respond strongly to outward motion emanating from the centre of the neuron's receptive field. Each dendritic arm also receives local inhibitory inputs directionally selective for inward motion opposing the excitation. This radial motion opponency generates a balance of excitation and inhibition that makes LPLC2 non-responsive to related patterns of motion such as contraction, wide-field rotation or luminance change. As a population, LPLC2 neurons densely cover visual space and terminate onto the giant fibre descending neurons, which drive the jump muscle motor neuron to trigger an escape take off. Our findings provide a mechanistic description of the selective feature detection that flies use to discern and escape looming threats.

  9. MARVELS Radial Velocity Solutions to Seven Kepler Eclipsing Binaries

    Science.gov (United States)

    Heslar, Michael Francis; Thomas, Neil B.; Ge, Jian; Ma, Bo; Herczeg, Alec; Reyes, Alan; SDSS-III MARVELS Team

    2016-01-01

    Eclipsing binaries serve momentous purposes to improve the basis of understanding aspects of stellar astrophysics, such as the accurate calculation of the physical parameters of stars and the enigmatic mass-radius relationship of M and K dwarfs. We report the investigation results of 7 eclipsing binary candidates, initially identified by the Kepler mission, overlapped with the radial velocity observations from the SDSS-III Multi-Object APO Radial-Velocity Exoplanet Large-Area Survey (MARVELS). The RV extractions and spectroscopic solutions of these eclipsing binaries were generated by the University of Florida's 1D data pipeline with a median RV precision of ~60-100 m/s, which was utilized for the DR12 data release. We performed the cross-reference fitting of the MARVELS RV data and the Kepler photometric fluxes obtained from the Kepler Eclipsing Binary Catalog (V2) and modelled the 7 eclipsing binaries in the BinaryMaker3 and PHOEBE programs. This analysis accurately determined the absolute physical and orbital parameters of each binary. Most of the companion stars were determined to have masses of K and M dwarf stars (0.3-0.8 M⊙), and allowed for an investigation into the mass-radius relationship of M and K dwarfs. Among the cases are KIC 9163796, a 122.2 day period "heartbeat star", a recently-discovered class of eccentric binaries known for tidal distortions and pulsations, with a high eccentricity (e~0.75) and KIC 11244501, a 0.29 day period, contact binary with a double-lined spectrum and mass ratio (q~0.45). We also report on the possible reclassification of 2 Kepler eclipsing binary candidates as background eclipsing binaries based on the analysis of the flux measurements, flux ratios of the spectroscopic and photometric solutions, the differences in the FOVs, the image processing of Kepler, and RV and spectral analysis of MARVELS.

  10. Radial dilation of nephrostomy balloons: a comparative analysis

    Directory of Open Access Journals (Sweden)

    Kari Hendlin

    2008-10-01

    Full Text Available PURPOSE: The dynamics of percutaneous balloon expansion may differ with increasing extrinsic compressive forces and increasing inflation pressures. This study compares the ability of percutaneous balloons to expand under different radial constrictive forces. MATERIALS AND METHODS: Three 30F nephrostomy balloons were tested: Bard X-Force™, Boston Scientific Microvasive Amplatz Tractmaster™, and Cook Ultraxx™. With a super stiff guidewire in place, the balloon tip was secured by elevated vice grips on either side of the balloon. A string was wrapped around the balloon center once, and incremental increases in load were added (2g, 42g, 82g, and 122g to represent increasing extrinsic compression. The balloon was inflated with a contrast agent and circumference changes were measured at increments of 4 ATM, 10 ATM, and burst pressure. Balloons were tested in triplicate for each load. RESULTS: All balloons were unable to reach 90% of their expected diameter with larger constrictive loads (122g at low (4 ATM and nominal (10 ATM inflation pressures. Only the Bard and Cook balloons reached at least 90% of the expected diameter with a coefficient of variance (CV less than 10% at burst pressure under the larger constrictive load (122g, 94.3% ± 6.7%, CV 7.1% and 96.3% ± 2.9%, CV 3.0% respectively. All balloons performed well under low constriction forces and reached at least 80% of the expected diameter by 10 ATM under all constrictive loads. CONCLUSIONS: The Bard X-Force and Cook Ultraxx percutaneous nephrostomy balloons achieved the most reliable radial dilation against large constrictive forces simulating fascial or retroperitoneal scar tissue.

  11. Radial dilation of nephrostomy balloons: a comparative analysis.

    Science.gov (United States)

    Hendlin, Kari; Monga, Manoj

    2008-01-01

    The dynamics of percutaneous balloon expansion may differ with increasing extrinsic compressive forces and increasing inflation pressures. This study compares the ability of percutaneous balloons to expand under different radial constrictive forces. Three 30F nephrostomy balloons were tested: Bard X-Force, Boston Scientific Microvasive Amplatz Tractmaster, and Cook Ultraxx. With a super stiff guidewire in place, the balloon tip was secured by elevated vice grips on either side of the balloon. A string was wrapped around the balloon center once, and incremental increases in load were added (2g, 42g, 82g, and 122g) to represent increasing extrinsic compression. The balloon was inflated with a contrast agent and circumference changes were measured at increments of 4 ATM, 10 ATM, and burst pressure. Balloons were tested in triplicate for each load. All balloons were unable to reach 90% of their expected diameter with larger constrictive loads (122g) at low (4 ATM) and nominal (10 ATM) inflation pressures. Only the Bard and Cook balloons reached at least 90% of the expected diameter with a coefficient of variance (CV) less than 10% at burst pressure under the larger constrictive load (122g), 94.3% +/- 6.7%, CV 7.1% and 96.3% +/- 2.9%, CV 3.0% respectively. All balloons performed well under low constriction forces and reached at least 80% of the expected diameter by 10 ATM under all constrictive loads. The Bard X-Force and Cook Ultraxx percutaneous nephrostomy balloons achieved the most reliable radial dilation against large constrictive forces simulating fascial or retroperitoneal scar tissue.

  12. ST-segment elevation myocardial infarction treated by radial or femoral approach in a multicenter randomized clinical trial: the STEMI-RADIAL trial.

    Science.gov (United States)

    Bernat, Ivo; Horak, David; Stasek, Josef; Mates, Martin; Pesek, Jan; Ostadal, Petr; Hrabos, Vlado; Dusek, Jaroslav; Koza, Jiri; Sembera, Zdenek; Brtko, Miroslav; Aschermann, Ondrej; Smid, Michal; Polansky, Pavel; Al Mawiri, Abdul; Vojacek, Jan; Bis, Josef; Costerousse, Olivier; Bertrand, Olivier F; Rokyta, Richard

    2014-03-18

    This study sought to compare radial and femoral approaches in patients presenting with ST-segment elevation myocardial infarction (STEMI) and undergoing primary percutaneous coronary intervention (PCI) by high-volume operators experienced in both access sites. The exact clinical benefit of the radial compared to the femoral approach remains controversial. STEMI-RADIAL (ST Elevation Myocardial Infarction treated by RADIAL or femoral approach) was a randomized, multicenter trial. A total of 707 patients referred for STEMI clinical events (NACE) was defined as a composite of death, myocardial infarction, stroke, and major bleeding/vascular complications. Access site crossover, contrast volume, duration of intensive care stay, and death at 6 months were secondary endpoints. The primary endpoint occurred in 1.4% of the radial group (n = 348) and 7.2% of the femoral group (n = 359; p = 0.0001). The NACE rate was 4.6% versus 11.0% (p = 0.0028), respectively. Crossover from radial to femoral approach was 3.7%. Intensive care stay (2.5 ± 1.7 days vs. 3.0 ± 2.9 days, p = 0.0038) as well as contrast utilization (170 ± 71 ml vs. 182 ± 60 ml, p = 0.01) were significantly reduced in the radial group. Mortality in the radial and femoral groups was 2.3% versus 3.1% (p = 0.64) at 30 days and 2.3% versus 3.6% (p = 0.31) at 6 months, respectively. In patients with STEMI undergoing primary PCI by operators experienced in both access sites, the radial approach was associated with significantly lower incidence of major bleeding and access site complications and superior net clinical benefit. These findings support the use of the radial approach in primary PCI as first choice after proper training. (Trial Comparing Radial and Femoral Approach in Primary Percutaneous Coronary Intervention [PCI] [STEMI-RADIAL]; NCT01136187). Copyright © 2014 American College of Cardiology Foundation. Published by Elsevier Inc. All rights reserved.

  13. Radial transport of poloidal momentum in ASDEX Upgrade in L-mode and H-mode

    DEFF Research Database (Denmark)

    Mehlmann, F.; Schrittwieser, R.; Naulin, Volker

    2012-01-01

    A reciprocating probe was used for localized measurements of the radial transport of poloidal momentum in the scrape-off layer (SOL) of ASDEX Upgrade (AUG). The probe measured poloidal and radial electric field components and density. We concentrate on three components of the momentum transport: ......: Reynolds stress, convective momentum flux and triple product of the fluctuating components of density, radial and poloidal electric field. For the evaluation we draw mainly on the probability density functions (PDFs)....

  14. Dispositivo de posicionamiento de muestras biológicas para su irradiación en un canal radial de un reactor nuclear // Biological samples positioning device for irradiations on a radial channel at the nuclear research reactor

    Directory of Open Access Journals (Sweden)

    Maritza Rodríguez - Gual

    2010-05-01

    Full Text Available ResumenPor la demanda de un dispositivo experimental para el posicionamiento de las muestras biológicaspara su irradiación en un canal radial de un reactor nuclear de investigaciones en funcionamiento, seconstruyó y se puso en marcha un dispositivo para la colocación y retirada de las muestras en laposición de irradiación de dicho canal. Se efectuaron las valoraciones económicas comparando conotro tipo de dispositivo con las mismas funciones. Este trabajo formó parte de un proyectointernacional entre Cuba y Brasil que abarcó el estudio de los daños inducidos por diferentes tipos deradiación ionizante en moléculas de ADN. La solución propuesta es comprobada experimentalmente,lo que demuestra la validez práctica del dispositivo. Como resultado del trabajo, el dispositivoexperimental para la irradiación de las muestras biológicas se encuentra instalado y funcionando yapor 5 años en el canal radial # 3(BH#3 Palabras claves: reactor nuclear de investigaciones, dispositivo para posicionamiento de muestras,___________________________________________________________________________AbstractFor the demand of an experimental device for biological samples positioning system for irradiationson a radial channel at the nuclear research reactor in operation was constructed and started up adevice for the place and remove of the biological samples from the irradiation channels withoutinterrupting the operation of the reactor. The economical valuations are effected comparing withanother type of device with the same functions. This work formed part of an international projectbetween Cuba and Brazil that undertook the study of the induced damages by various types ofionizing radiation in DNA molecules. Was experimentally tested the proposed solution, whichdemonstrates the practical validity of the device. As a result of the work, the experimental device forbiological samples irradiations are installed and operating in the radial beam hole #3(BH#3

  15. Experimental and Numerical Investigation of Radial Forces Acting on Centrifugal Pump Impeller

    Directory of Open Access Journals (Sweden)

    Karaskiewicz Krzysztof

    2014-12-01

    Full Text Available The paper presents the results of measurements and predictions of radial thrust in centrifugal pump with specific speed ns = 26. In the pump tested, a volute with rectangular cross-section was used. The tests were carried out for several rotational speeds, including speeds above and below the nominal one. Commercial code ANSYS Fluent was used for the calculations. Apart from the predictions of the radial force, the calculations of axial thrust were also conducted, and correlation between thrust and the radial force was found. In the range of the measured rotational speeds, similarity of radial forces was checked.

  16. The Role of Radial Clearance on the Performance of Foil Air Bearings

    Science.gov (United States)

    Radil, Kevin; Howard, Samuel; Dykas, Brian

    2002-01-01

    Load capacity tests were conducted to determine how radial clearance variations affect the load capacity coefficient of foil air bearings. Two Generation III foil air bearings with the same design but possessing different initial radial clearances were tested at room temperature against an as-ground PS304 coated journal operating at 30,000 rpm. Increases in radial clearance were accomplished by reducing the journal's outside diameter via an in-place grinding system. From each load capacity test the bearing load capacity coefficient was calculated from the rule-of-thumb (ROT) model developed for foil air bearings. The test results indicate that, in terms of the load capacity coefficient, radial clearance has a direct impact on the performance of the foil air bearing. Each test bearing exhibited an optimum radial clearance that resulted in a maximum load capacity coefficient. Relative to this optimum value are two separate operating regimes that are governed by different modes of failure. Bearings operating with radial clearances less than the optimum exhibit load capacity coefficients that are a strong function of radial clearance and are prone to a thermal runaway failure mechanism and bearing seizure. Conversely, a bearing operating with a radial clearance twice the optimum suffered only a 20 percent decline in its maximum load capacity coefficient and did not experience any thermal management problems. However, it is unknown to what degree these changes in radial clearance had on other performance parameters, such as the stiffness and damping properties of the bearings.

  17. Scaling Relations for the Efficiency of Radial Migration in Disk Galaxies

    Science.gov (United States)

    Daniel, Kathryne J.

    2018-01-01

    Radial migration is frequently recognized as an internal, secular process that could play an important role in disk galaxy evolution. The driving mechanism for radial migration is transient spiral patterns, which rearrange the orbital angular momentum distribution of disk stars around corotation without causing kinematic heating. Should radial migration be an efficient process, it could cause a substantial fraction of disk stars to move large radial distances over the lifetime of the disk, thus having a significant impact on the disk’s kinematic, structural and chemical evolution. Observational and simulated data are consistent with radial migration being important for kinematically cold stellar populations and less so for populations with hot kinematics. I will present an analytic criterion that determines which stars are in orbits that could lead to radial migration. I will then show some scaling relations for the efficacy of radial migration that result from applying this analytic criterion to a series of models that have a variety of distribution functions and spiral patterns in systems with an assumed flat rotation curve. Most importantly, I will argue that these scaling relations can be used to place constraints on the efficiency of radial migration, where stronger spiral patterns and kinematically cold populations will lead to a higher fraction of stars in orbits that can lead to radial migration.

  18. Study on Initiation Mechanisms of Hydraulic Fracture Guided by Vertical Multi-radial Boreholes

    Science.gov (United States)

    Guo, Tiankui; Liu, Binyan; Qu, Zhanqing; Gong, Diguang; Xin, Lei

    2017-07-01

    The conventional hydraulic fracturing fails in the target oil development zone (remaining oil or gas, closed reservoir, etc.) which is not located in the azimuth of maximum horizontal in situ stress of available wellbores. The technology of directional propagation of hydraulic fracture guided by vertical multi-radial boreholes is innovatively developed. The effects of in situ stress, wellbore internal pressure and fracturing fluid percolation effect on geostress field distribution are taken into account, a mechanical model of two radial boreholes (basic research unit) is established, and the distribution and change rule of the maximum principal stress on the various parameters have been studied. The results show that as the radial borehole azimuth increases, the preferential rock tensile fracturing in the axial plane of radial boreholes becomes increasingly difficult. When the radial borehole azimuth increases to a certain extent, the maximum principal stress no longer appears in the azimuth of the radial boreholes, but will go to other orientations outside the axial plane of radial boreholes and the maximum horizontal stress orientation. Therefore, by reducing the ratio between the distance of the radial boreholes and increasing the diameter of the radial boreholes can enhance the guiding strength. In the axial plane of the radical boreholes, particularly in the radial hole wall, position closer to the radial boreholes is more prone to rock tensile destruction. Even in the case of large radial borehole azimuth, rock still preferentially ruptures in this position. The more the position is perpendicularly far from the axis of the wellbore, the lesser it will be affected by wellbore, and the lesser the tensile stress of each point. Meanwhile, at a certain depth, due to the decrease in the impact of the wellbore and the impact of the two radial boreholes increases accordingly, at the further position from the wellbore axis, the tensile fracture is the most prone to

  19. Variação anatômica radial do lenho de açoita-cavalo (Luehea divaricata e sua influência na densidade aparente. Radial variation of wood anatomy in açoita-cavalo (Luehea divaricata and its influence on the specific gravity.

    Directory of Open Access Journals (Sweden)

    Eduardo Luiz LONGUI

    2009-12-01

    Full Text Available Variações entre as dimensões e frequênciasdas células da madeira existem entre espéciesdiferentes, entre indivíduos da mesma espécie ouainda dentro da mesma árvore nas direções radial eaxial. Essa variação influencia diretamente nadensidade aparente e consequentemente no uso dasdiferentes madeiras. O presente estudo determinoua variação anatômica radial e sua influência nadensidade aparente no lenho de árvores de Luehea divaricata, a partir de amostras coletadas no DAP,por meio de método destrutivo. Para a avaliaçãoanatômica e da densidade aparente foram empregadastécnicas usuais em anatomia e propriedades físicasda madeira e os dados tratados estatisticamente.Os resultados revelaram que o diâmetro dos vasos,espessura da parede das fibras e a densidadeaparente foram significativamente menores na regiãoda medula, já o lume das fibras foi significativamentemaior nesta região, que também apresentou raiosmais volumosos. Sugere-se que fibras com paredesmais finas e raios com maior volume na região damedula contribuíram de forma determinante paraos menores valores de densidade aparente.Variations between the size and frequencyof the wood cells occur among differentspecies, trees of the same species or even withinthe same tree in the radial and axial directions.These variations affect directly the specific gravityand consequently the use of different woods.This study determined the radial anatomicalvariation and its influence on specific gravity ofthe wood of Luehea divaricata trees, from samplescollected on DBH by using destructive method.For the evaluation of anatomical characteristicsand specific gravity were employed standardtechniques in anatomy and physical propertiesof wood and the data analyzed statistically.The results revealed significantly lower vesseldiameter, fiber wall thickness and specific gravityin pith, fiber lumen was significantly higher inthis region, which also showed very large rays.It is suggested

  20. Caracterização do lenho e variação radial de Pittosporum undulatum Vent. (pau-incenso)

    OpenAIRE

    Longui, Eduardo Luiz; Romeiro,Diego; Silva,Morgana Tramontini da; Ribeiro,Ariane; Gouveia,Tatiana Cestini; Lima,Israel Luiz de; Florsheim, Sandra Monteiro Borges

    2011-01-01

    Estudou-se o lenho de Pittosporum undulatum do Parque Estadual Alberto Löfgren, objetivando-se sua caracterização, investigar a variação radial da anatomia e densidade básica, suas correlações e discutir os resultados em um contexto ecológico. Empregaram-se as metodologias usuais para anatomia e densidade da madeira. As características anatômicas corroboram com o descrito para o gênero, ressalta-se a presença de camadas de crescimento, não mencionada na literatura. O diâmetro das fibras não a...

  1. NEW RADIAL ABUNDANCE GRADIENTS FOR NGC 628 AND NGC 2403

    Energy Technology Data Exchange (ETDEWEB)

    Berg, Danielle A.; Skillman, Evan D. [Department of Astronomy, University of Minnesota, 116 Church St. SE, Minneapolis, MN 55455 (United States); Croxall, Kevin V. [Ohio State University, 140 West 18th Avenue, Columbus, OH 43210 (United States); Marble, Andrew R. [National Solar Observatory, 950 N Cherry Avenue, Tucson, AZ 85719 (United States); Smith, J. D. [Ritter Astrophysical Observatory, University of Toledo, Toledo, OH 43606 (United States); Gordon, Karl [Space Telescope Science Institute, 3700 San Martin Drive, Baltimore, MD 21218 (United States); Kennicutt, Robert C. Jr. [Institute of Astronomy, University of Cambridge, Madingley Road, Cambridge CB3 0HA (United Kingdom); Garnett, Donald R., E-mail: berg@astro.umn.edu, E-mail: skillman@astro.umn.edu, E-mail: croxall.5@osu.edu, E-mail: amarble@nso.edu, E-mail: jd.smith@utoledo.edu, E-mail: kgordon@stsci.edu, E-mail: robk@ast.cam.ac.uk

    2013-10-01

    Motivated by recent interstellar medium studies, we present high quality MMT and Gemini spectroscopic observations of H II regions in the nearby spiral galaxies NGC 628 and NGC 2403 in order to measure their chemical abundance gradients. Using long-slit and multi-object mask optical spectroscopy, we obtained measurements of the temperature sensitive auroral lines [O III] λ4363 and/or [N II] λ5755 at a strength of 4σ or greater in 11 H II regions in NGC 628 and 7 regions in NGC 2403. These observations allow us, for the first time, to derive an oxygen abundance gradient in NGC 628 based solely on 'direct' oxygen abundances of H II regions: 12 + log(O/H) = (8.43 ± 0.03) + (–0.017 ± 0.002) × R{sub g} (dex kpc{sup –1}), with a dispersion in log(O/H) of σ = 0.10 dex, from 14 regions with a radial coverage of ∼2-19 kpc. This is a significantly shallower slope than found by previous 'strong-line' abundance studies. In NGC 2403, we derive an oxygen abundance gradient of 12 + log(O/H) = (8.48 ± 0.04) + (–0.032 ± 0.007)× R{sub g} (dex kpc{sup –1}), with a dispersion in log(O/H) of σ = 0.07 dex, from seven H II with a radial coverage of ∼1-10 kpc. Additionally, we measure the N, S, Ne, and Ar abundances. We find the N/O ratio decreases with increasing radius for the inner disk, but reaches a plateau past R{sub 25} in NGC 628. NGC 2403 also has a negative N/O gradient with radius, but we do not sample the outer disk of the galaxy past R{sub 25} and so do not see evidence for a plateau. This bi-modal pattern measured for NGC 628 indicates dominant contributions from secondary nitrogen inside of the R{sub 25} transition and dominantly primary nitrogen farther out. As expected for α-process elements, S/O, Ne/O, and Ar/O are consistent with constant values over a range in oxygen abundance.

  2. Adaptive radial basis function mesh deformation using data reduction

    Science.gov (United States)

    Gillebaart, T.; Blom, D. S.; van Zuijlen, A. H.; Bijl, H.

    2016-09-01

    Radial Basis Function (RBF) mesh deformation is one of the most robust mesh deformation methods available. Using the greedy (data reduction) method in combination with an explicit boundary correction, results in an efficient method as shown in literature. However, to ensure the method remains robust, two issues are addressed: 1) how to ensure that the set of control points remains an accurate representation of the geometry in time and 2) how to use/automate the explicit boundary correction, while ensuring a high mesh quality. In this paper, we propose an adaptive RBF mesh deformation method, which ensures the set of control points always represents the geometry/displacement up to a certain (user-specified) criteria, by keeping track of the boundary error throughout the simulation and re-selecting when needed. Opposed to the unit displacement and prescribed displacement selection methods, the adaptive method is more robust, user-independent and efficient, for the cases considered. Secondly, the analysis of a single high aspect ratio cell is used to formulate an equation for the correction radius needed, depending on the characteristics of the correction function used, maximum aspect ratio, minimum first cell height and boundary error. Based on the analysis two new radial basis correction functions are derived and proposed. This proposed automated procedure is verified while varying the correction function, Reynolds number (and thus first cell height and aspect ratio) and boundary error. Finally, the parallel efficiency is studied for the two adaptive methods, unit displacement and prescribed displacement for both the CPU as well as the memory formulation with a 2D oscillating and translating airfoil with oscillating flap, a 3D flexible locally deforming tube and deforming wind turbine blade. Generally, the memory formulation requires less work (due to the large amount of work required for evaluating RBF's), but the parallel efficiency reduces due to the limited

  3. SINTESA EKSPRESI WAJAH DENGAN MENGGUNAKAN RADIAL BASIS FUNCTION NETWORK

    Directory of Open Access Journals (Sweden)

    Wiwik Anggraeni

    2003-07-01

    Full Text Available Normal 0 false false false IN X-NONE X-NONE MicrosoftInternetExplorer4 /* Style Definitions */ table.MsoNormalTable {mso-style-name:"Table Normal"; mso-tstyle-rowband-size:0; mso-tstyle-colband-size:0; mso-style-noshow:yes; mso-style-priority:99; mso-style-qformat:yes; mso-style-parent:""; mso-padding-alt:0cm 5.4pt 0cm 5.4pt; mso-para-margin:0cm; mso-para-margin-bottom:.0001pt; mso-pagination:widow-orphan; font-size:11.0pt; font-family:"Calibri","sans-serif"; mso-ascii-font-family:Calibri; mso-ascii-theme-font:minor-latin; mso-fareast-font-family:"Times New Roman"; mso-fareast-theme-font:minor-fareast; mso-hansi-font-family:Calibri; mso-hansi-theme-font:minor-latin; mso-bidi-font-family:"Times New Roman"; mso-bidi-theme-font:minor-bidi;} Pada penelitian yang sebelumnya [4] telah dilakukan penelitian tentang letak-letak (koordinat facial characteristic points (FCP yang digunakan sebagai dasar untuk mengenali ekspresi-ekspresi wajah manusia. Diantaranya ada enam ekspresi wajah, yaitu gembira, sedih, marah, takut, terkejut, dan jijik yang digunakan dalam penelitian tersebut. Dengan adanya dasar tersebut, maka dalam penelitian ini penulis berusaha mensintesa ekspresi wajah yang dikategorikan menjadikan enam ekspresi dengan menggunakan facial characteristic points tersebut. Prinsip dasar dari mensintesa ekspresi wajah adalah mencari pemindahan spasial relatif facial characteristic points pada setiap ekspresi. Permasalahan utamanya adalah bagaimana menghasilkan wajah dengan ekspresi tertentu dari sebuah citra input wajah tanpa ekspresi. Dengan menggunakan 30 pasang perpindahan titik FCP, dilakukan training terhadap Radial Basis Function Network (RBFN 6 x n x 60 (6 input yang merupakan kadar dari keenam ekspresi, n hidden unit, dan 60 output yang merupakan 30 pasang perpindahan FCP, dimana n adalah variabel. RBFN yang telah ditraining dapat menghasilkan perpindahan FCP sesudai dengan ekspresi yang diinputkan. Informasi pemindahan FCP ini kemudian

  4. Osteoporosis and radial head fractures in female patients: a case-control study

    NARCIS (Netherlands)

    Kaas, Laurens; Sierevelt, Inger N.; Vroemen, Jos P. A. M.; van Dijk, Cornelis N.; Eygendaal, Denise

    2012-01-01

    Background: Identifying radial head fractures as fragility fractures may improve case-findings for osteoporosis and thus be an indicator other fragility fractures. Materials and methods: Thirty-five women aged >= 50 years with a radial head fracture and 57 controls were retrospectively selected and

  5. 77 FR 30435 - In-core Thermocouples at Different Elevations and Radial Positions in Reactor Core

    Science.gov (United States)

    2012-05-23

    ... COMMISSION 10 CFR Part 50 In-core Thermocouples at Different Elevations and Radial Positions in Reactor Core... ``require all holders of operating licenses for nuclear power plants (``NPP'') to operate NPPs with in-core thermocouples at different elevations and radial positions throughout the reactor core.'' DATES: Submit comments...

  6. Age versus size determination of radial variation in wood specific gravity : lessons from eccentrics

    Science.gov (United States)

    G. Bruce Williamson; Michael C. Wiemann

    2011-01-01

    Radial increases in wood specific gravity have been shown to characterize early successional trees from tropical forests. Here, we develop and apply a novel method to test whether radial increases are determined by tree age or tree size. The method compares the slopes of specific gravity changes across a short radius and a long radius of trees with eccentric trunks. If...

  7. Evaluation of donor site function and morbidity of the fasciocutaneous radial forearm flap

    NARCIS (Netherlands)

    de Bree, Remco; Hartley, Chris; Smeele, Ludwig E.; Kuik, Dirk J.; Quak, Jasper J.; Leemans, C. René

    2004-01-01

    To assess the results of the use of the free radial forearm flap in terms of objective morbidity and subjective patient response. The donor sites were examined from 37 patients who underwent reconstruction with a free fasciocutaneous radial forearm flap in the head and neck after ablative tumor

  8. Solutions to the N-dimensional radial Schrödinger equation for the ...

    Indian Academy of Sciences (India)

    The results of this study are in good agreement with the other studies. Keywords. N-dimensional radial Schrödinger equation; Coulomb perturbed potential; eigenvalue; eigenfunction; quantum dot. PACS No. 03.65.Ge. 1. Introduction. Since its discovery, the radial Schrödinger equation (SE) has been playing a crucial role in.

  9. Radial velocity study of the Be star ζ Tau (HR 1910)

    Science.gov (United States)

    Jarad, M. M.

    1987-12-01

    Extensive radial velocity investigation has been presented in this paper for the bright Be star HR 1910, based upon thirty-three spectrograms. The analysis of these radial velocity measurements has demonstrated clearly the binary nature of the star and new orbital elements were determined. A brief discussion of the previous work on this system appears in the relevant sections.

  10. Nondestructive estimation of tracheid length from sections of radial wood strips by near infrared spectroscopy

    Science.gov (United States)

    Laurence R. Schimleck; P. David Jones; Gary F. Peter; F. Daniels; Alexander Clarklll

    2004-01-01

    The use of calibrated near infrared (NIR) spectroscopy for predicting tracheid length of Pinus taeda L. (loblolly pine) wood samples is described. Ten-mm sections of 14 P. taeda radial strips were selected and NIR spectra obtained from the radial longitudinal face of each section. The fibers in these sections were characterized in terms of arithmetic and length-...

  11. On radial gas flows, the Galactic Bar and chemical evolution in the Galactic Disc

    OpenAIRE

    Portinari, L.; Chiosi, C.

    2000-01-01

    We develop a numerical chemical model allowing for radial flows of gas, with the aim to analyse the possible role of gas flows in the chemical evolution of the Galactic Disc. The dynamical effects of the Galactic Bar on the radial gas profile of the Disc are especially addressed.

  12. Fixation of two part fracture of radial head by pre-bend K-wire: An ...

    African Journals Online (AJOL)

    The study was aimed to see the functional status of elbow after fixation with pre bend K- wire in Mason type II Radial head fractures. We have studied eight patients (3 females and 5 males) with Mason type II isolated radial head fractures aged between 15 and 65 years (average 39 years) who underwent open reduction and ...

  13. Angular momentum, accretion, and radial flows in chemodynamical models of spiral galaxies

    NARCIS (Netherlands)

    Pezzulli, G.; Fraternali, F.

    2016-01-01

    Gas accretion and radial flows are key ingredients of the chemical evolution of spiral galaxies. They are also tightly linked to each other (accretion drives radial flows due to angular momentum conservation) and should therefore be modeled simultaneously. We summarize an algorithm that can be used

  14. Radial bisection of words and lines in right-brain-damaged patients with spatial neglect.

    Science.gov (United States)

    Veronelli, Laura; Arduino, Lisa S; Girelli, Luisa; Vallar, Giuseppe

    2017-09-01

    The bisection of lines positioned radially (with the two ends of the line close and far, with respect to the participant's body) has been less investigated than that of lines placed horizontally (with their two ends left and right, with respect to the body's midsagittal plane). In horizontal bisection, patients with left neglect typically show a rightward bias for both lines and words, greater with longer stimuli. As for radial bisection, available data indicate that neurologically unimpaired participants make a distal error, while results from right-brain-damaged patients with left spatial neglect are contradictory. We investigated the bisection of radially oriented words, with the prediction that, during bisection, linguistic material would be recoded to its canonical left-to-right format in reading, with the performance of neglect patients being similar to that for horizontal words. Thirteen right-brain-damaged patients (seven with left spatial neglect) and fourteen healthy controls were asked to manually bisect 40 radial and 40 horizontal words (5-10 letters), and 80 lines, 40 radial and 40 horizontal, of comparable length. Right-brain-damaged patients with spatial neglect exhibited a proximal bias in the bisection of short radial words, with the proximal part corresponding to the final right part of horizontally oriented words. This proximal error was not found in patients without neglect and healthy controls. For bisection, short radial words may be recoded to the canonical orthographic horizontal format, unveiling the impact of left neglect on radially oriented stimuli. © 2015 The British Psychological Society.

  15. Elbow joint laxity after experimental radial head excision and lateral collateral ligament rupture

    DEFF Research Database (Denmark)

    Jensen, Steen Lund; Olsen, Bo Sanderhoff; Tyrdal, Stein

    2005-01-01

    rotation of the ulna were measured during passive flexion-extension and application of a 0.75-Nm torque in 6 intact cadaveric elbows and after (1) either excision of the radial head or division of the LCL, (2) removal of both constraints, (3) isolated radial head prosthetic replacement, (4) isolated LCL...

  16. Reconstruction for Wassel type III radial polydactyly with two digits equal in size.

    Science.gov (United States)

    Horii, Emiko; Hattori, Tatsuya; Koh, Syukuki; Majima, Masataka

    2009-12-01

    To report the surgical outcomes for Wassel type III radial polydactyly thumbs of equal or nearly equal size treated by excising the radial thumb with augmentation. We have reconstructed 15 cases of Wassel type III radial polydactyly, in which the duplicated digits were equal or almost equal in size, by ablation of a radial digit. The distal articular surface of the radial proximal phalanx was preserved in order to maintain stability of the interphalangeal joint. The stability of the retained thumb was further augmented by tendon repositioning, restoration of the radial collateral ligament, and transfer of soft tissues from the radial digit. Eleven of 15 cases were followed up for more than 2 years and were available for assessment using the Japanese Society for Surgery of the Hand evaluation form. The average age at follow-up was 8 years and 3 months. The size of the nail and distal phalanx was measured to assess the growth of the thumb. An average functional point was 12 points (maximum 14 points), and restricted interphalangeal joint motion and extension lag were the disadvantages of this technique. The width of the distal phalanx was increased from 62% of the size of the metacarpal before surgery to 78% at the final follow-up. The cosmetic score averaged 3.6 (maximum 4 points), and slightly small nails without a central ridge were deemed acceptable. Our technique can provide a functionally good thumb for Wassel type III radial polydactyly. Therapeutic IV.

  17. Radiation exposure and patient experience during percutaneous coronary intervention using radial and femoral artery access

    Energy Technology Data Exchange (ETDEWEB)

    Geijer, Haakan [Department of Radiology, Oerebro University Hospital, 701 85, Oerebro (Sweden); Persliden, Jan [Department of Medical Physics, Oerebro University Hospital, 701 85, Oerebro (Sweden); Department of Medicine and Care, Faculty of Health Sciences, Linkoeping University, 581 85, Linkoeping (Sweden)

    2004-09-01

    The aim of this study was to evaluate radiation dose and patient discomfort/pain in radial artery access vs femoral artery access in percutaneous coronary intervention (PCI). Dose-area product (DAP) was measured non-randomised for 114 procedures using femoral access and for 55 using radial access. The patients also responded to a questionnaire concerning discomfort and pain during and after the procedure. The mean DAP was 69.8 Gy cm{sup 2} using femoral access and 70.5 Gy cm{sup 2} using radial access. Separating the access site from confounding factors with a multiple regression, there was a 13% reduction in DAP when using radial access (p=0.038). Procedure times did not differ (p=0.81). Bed confinement was much longer in the femoral access group (448 vs 76 min, p=0.000). With femoral access, there was a significantly higher patient grading for chest (p=0.001) and back pain (p=0.003) during the procedure and for access site (p=0.000) and back pain (p=0.000) after the procedure. Thirty-two femoral access patients (28%) were given morphine-type analgesics in the post-procedure period compared to three radial access patients (5%, p=0.001). DAP does not increase when using radial instead of femoral access and the patients grade discomfort and pain much lower when using radial access. Radial access is thus beneficial to use. (orig.)

  18. Overexpression of Akt converts radial growth melanoma to vertical growth melanoma.

    NARCIS (Netherlands)

    Govindarajan, B.; Sligh, J.E.; Vincent, B.J.; Li, M.; Canter, J.A.; Nickoloff, B.J.; Rodenburg, R.J.T.; Smeitink, J.A.M.; Oberley, L.; Zhang, Y.; Slingerland, J.; Arnold, R.S.; Lambeth, J.D.; Cohen, C.; Hilenski, L.; Griendling, K.; Martinez-Diez, M.; Cuezva, J.M.; Arbiser, J.L.

    2007-01-01

    Melanoma is the cancer with the highest increase in incidence, and transformation of radial growth to vertical growth (i.e., noninvasive to invasive) melanoma is required for invasive disease and metastasis. We have previously shown that p42/p44 MAP kinase is activated in radial growth melanoma,

  19. Percutaneous reduction and leverage fixation using K-wires in paediatric angulated radial neck fractures.

    Science.gov (United States)

    Cha, Soo Min; Shin, Hyun Dae; Kim, Kyung Cheon; Han, Sun Cheol

    2012-04-01

    We evaluated the usefulness of percutaneous reduction and leverage fixation using K-wires in children with radial neck fractures. Between 2006 and 2008, we evaluated 13 paediatric patients with radial neck fractures who had been observed for at least two years and underwent percutaneous reduction and leverage fixation using K-wires. We measured radial angulation and radial translation using preoperative, postoperative and final follow-up radiographs, and we clinically investigated range of motion and carrying angle according to Steele's grading system. Excellent clinical results were achieved in 11 (84.6%) patients, good results in one (7.6%) and fair results in one (7.6%). There were no poor results. The patient in whom fair results were achieved also had an olecranon fracture, which was treated conservatively. Complications such as nonunion, infection, iatrogenic nerve injury and periarticular ossification were minimal. Radioulnar synostosis was absent between the radial neck fracture and the greenstick fracture of the olecranon. Growth arrest in the proximal radial epiphysis was also absent. Percutaneous reduction and leverage fixation using K-wires in children with radial neck fractures is a recommended surgical treatment that can achieve recovery of normal radial angulation and elbow motion.

  20. Clinical and radiographic outcome of revision surgery of radial head prostheses: midterm results in 16 patients

    NARCIS (Netherlands)

    Viveen, Jetske; Kodde, Izaäk F.; Koenraadt, Koen L. M.; Beumer, Annechien; The, Bertram; Eygendaal, Denise

    2017-01-01

    Little is known about revision surgery of radial head arthroplasty. The aim of this study was to report on the clinical and radiographic outcome of revision arthroplasty of the elbow with a bipolar metallic radial head prosthesis. Between 2006 and 2013, we used either a press-fit or cemented RHS

  1. Page 1 § Radial displacements in a porous medium 65 0.50 0.00 ...

    Indian Academy of Sciences (India)

    Figure 4. Variation of radial displacement [U*=(2Nu/Fa) x 10] versus radial distance. (X = rſa). For Q/R->0, p.12/p32-0, we obtain the expression for displacement in solid part, u(r,t), as obtained by Vodicka [12], whereas displacement in liquid part, U(r,t), vanishes.

  2. Comparison of measured and computed radial trajectories of plasma focus devices UMDPF1 and UMDPF0

    Energy Technology Data Exchange (ETDEWEB)

    Lim, L. H.; Yap, S. L., E-mail: yapsl@um.edu.my; Lim, L. K.; Lee, M. C.; Poh, H. S.; Ma, J. [Plasma Technology Research Centre, Department of Physics, Faculty of Science, University of Malaya, 50603 Kuala Lumpur (Malaysia); Yap, S. S. [UMPEDAC, University of Malaya, 50603 Kuala Lumpur (Malaysia); Faculty of Engineering, Multimedia University, Cyberjaya, 63100 Selangor (Malaysia); Lee, S. [Plasma Technology Research Centre, Department of Physics, Faculty of Science, University of Malaya, 50603 Kuala Lumpur (Malaysia); INTI International University, 71800 Nilai (Malaysia); Institute for Plasma Focus Studies, 32 Oakpark Drive, Chadstone 3148 (Australia)

    2015-09-15

    In published literature, there has been scant data on radial trajectory of the plasma focus and no comparison of computed with measured radial trajectory. This paper provides the first such comparative study. We compute the trajectories of the inward-moving radial shock and magnetic piston of UMDPF1 plasma focus and compare these with measured data taken from a streak photograph. The comparison shows agreement with the measured radial trajectory in terms of average speeds and general shape of trajectory. This paper also presents the measured trajectory of the radially compressing piston in another machine, the UMDPF0 plasma focus, confirming that the computed radial trajectory also shows similar general agreement. Features of divergence between the computed and measured trajectories, towards the end of the radial compression, are discussed. From the measured radial trajectories, an inference is made that the neutron yield mechanism could not be thermonuclear. A second inference is made regarding the speeds of axial post-pinch shocks, which are recently considered as a useful tool for damage testing of fusion-related wall materials.

  3. Rare high origin of the radial artery: a bilateral, symmetrical case ...

    African Journals Online (AJOL)

    Arterial variations in the upper limb can occur at the level of the axillary, brachial, radial and ulnar arteries as well as the palmar arches. This is a report of bilateral, symmetrical high origin of the radial artery from the axillary artery. Knowledge of such variations is important in vascular and reconstructive surgery. (Nig J Surg ...

  4. Avulsão do plexo braquial em cães - 2: biópsia fascicular e histologia dos nervos radial, mediano, ulnar e musculocutâneo Brachial plexus avulsion in dogs - 2: fascicular biopsy and histology of the radial, median, ulnar and musculocutaneous nerves

    Directory of Open Access Journals (Sweden)

    Mônica Vicky Bahr Arias

    1997-03-01

    Full Text Available O objetivo deste trabalho foi demonstrar os aspectos clínicos e neurológicos relevantes para o diagnóstico da avulsão do plexo braquial em cães, relacionando estes achados com os resultados da histologia dos nervos radiais, medianos, ulnar e músculo cutânea. A biópsia fascicular destes nervos foi realizada após abordagem cirúrgica às faces lateral e medial do braço afetado. Todos os fascículos submetidos ao exame histológico apresentaram alterações como tumefação axonal, degeneração walleriana e infiltrado inflamatório em graus variados, havendo principalmente nos nervos radial, mediano e ulnar a proliferação de colagem endoneural. A associação destes resultados com as alterações neurológicas e da eletroneuroestimulação (relatados na parte 1 e 3 deste trabalho respectivamente sugeriu envolvimento quase que total das raízes do plexo braquial em todos os casos.The main purposes of this work were the neurological evaluation of dogs with brachial plexus avulsion and correlation of these findings with the results of histology of the radial, median, and ulnar and muscle cutaneous nerves. Fascicular nerve biopsy was performed after surgical approach of medial and lateral aspect of the arm. Ali the submitted fascicles presented histologic alterations compatible with wallerian degeneration, axonal swelling, and inflammatory infiltrate ranging from mild to pronounced, with endoneural collagen proliferation mainly in radial, median and ulnar nerves. The association of these results with neurological and electroneurostimulation exams (respectively described in part 1 and 3 of this work suggested in all cases an almost total involvement of brachial plexus roots.

  5. Global kinetic hybrid simulation for radially expanding solar wind

    Science.gov (United States)

    Dyadechkin, S.; Semenov, V. S.; Kallio, E.; Erkaev, N. V.; Alho, M.; Lammer, H.

    2017-08-01

    We present the results of a 1-D global kinetic simulation of the solar wind in spherical coordinates without a magnetic field in the region from the Sun to the Earth's orbit. Protons are considered as particles while electrons are considered as a massless fluid, with a constant temperature, in order to study the relation between the hybrid and hydrodynamic solutions. It is shown that the strong electric field in the hybrid model accelerates the protons. Since the electric field in the model is related to electron pressure, each proton in the initial Maxwellian velocity distribution function moves under the same forces as in the classical Parker Solar wind model. The study shows that the hybrid model results in very similar velocity and number density distributions along the radial distance as in the Parker model. In the hybrid simulations, the proton temperature is decreased with distance in 1 order of magnitude. The effective polytropic index of the proton population slightly exceeds 1 at larger distances with the maximum value ˜1.15 in the region near the Sun. A highly non-Maxwellian type of distribution function is initially formed. Further from the Sun, a narrow beam of the escaping protons is created which does not change much in later expansion. The results of our study indicates that already a nonmagnetized global hybrid model is capable of reproducing some fundamental features of the expanding solar wind shown in the Parker model and additional kinetic effects in the solar wind.

  6. [Free radial forearm flap in head and neck: our experience].

    Science.gov (United States)

    Tornero, Jordi; Cruz-Toro, Paula; Farré, Anna; Vega-Celiz, Jorge; Skufca, Javier; Nogués, Julio; Maños-Pujol, Manel

    2014-01-01

    Oncologic surgery leads to important defects and sequelae, as well as notable cosmetic and functional alterations. In this aspect reconstructive surgery has an essential role, allowing more radical excision and lower associated functional and cosmetic morbidities. The aim of this study was to present and evaluate the experience and results of the reconstructive microsurgery unit in our centre's ENT department. Retrospective study of procedures performed between 2006 and 2012. A total of 36 cases were reviewed. The primary tumour was found in the oropharynx (58%) in the majority of cases. In 5 cases the procedure was performed for reconstruction and fistula closure (4 pharyngostoma and 1 tracheoesophageal fistula). Failure from total necrosis was 16% (6/36). No associated mortality has been reported. The most common postoperative complications were wound dehiscence in 5 patients and pharyngostoma (fistula) in 5 cases. Prior radiotherapy significantly influenced the increase in the overall incidence of complications (P<05). Reconstructive surgery currently plays an important role in surgery for head and neck cancer. The radial forearm flap is a safe, reliable method for reconstruction of most defects in the ENT field. This type of intervention provides greater autonomy and safety in surgical oncology. Copyright © 2013 Elsevier España, S.L. All rights reserved.

  7. Linear radial structure of reactive energetic geodesic acoustic modes

    Science.gov (United States)

    Qu, Z. S.; Hole, M. J.; Fitzgerald, M.

    2017-05-01

    In this paper we have developed a fluid model to study the radial mode structure of the reactive energetic geodesic acoustic modes (reactive EGAMs), a branch of GAM that becomes unstable in the presence of a cold fast ion beam. We have solved the resulting dispersion relationship, a second order ODE, both analytically in restricted cases and numerically in general. It is found that the reactive EGAM global mode structure is formed with the inclusion of fast ion finite drift orbit effects. In two cases with typical DIII-D parameters but different q profiles, the global EGAM frequency is slightly higher than the local EGAM extremum, located either on axis with a monotonic shear or at mid-radius with a reversed shear. The mode wavelength roughly scales with {L}{orbit}1/2 in the core and {L}{orbit} at the edge, though the dependency is more complicated for the reversed shear case when {L}{orbit}< 0.06a ({L}{orbit} is the fast ion drift orbit width and a the minor radius). Finally, the growth rate of the global mode is boosted by 50% to 100% when switching from co-beam to counter-beam, depending on the fast ion density, which may help to explain the more frequent occurrence of EGAMs with counter-injection in experiments.

  8. Lithospheric radial anisotropy beneath the Gulf of Mexico

    Science.gov (United States)

    Chu, Risheng; Ko, Justin Yen-Ting; Wei, Shengji; Zhan, Zhongwen; Helmberger, Don

    2017-05-01

    The Lithosphere-Asthenosphere Boundary (LAB), where a layer of low viscosity asthenosphere decouples with the upper plate motion, plays an essential role in plate tectonics. Most dynamic modeling assumes that the shear velocity can be used as a surrogate for viscosity which provides key information about mantle flow. Here, we derive a shear velocity model for the LAB structure beneath the Gulf of Mexico allowing a detailed comparison with that beneath the Pacific (PAC) and Atlantic (ATL). Our study takes advantage of the USArray data from the March 25th, 2013 Guatemala earthquake at a depth of 200 km. Such data is unique in that we can observe a direct upward traveling lid arrival which remains the first arrival ahead of the triplications beyond 18°. This extra feature in conjunction with upper-mantle triplication sampling allows good depth control of the LAB and a new upper-mantle seismic model ATM, a modification of ATL, to be developed. ATM has a prominent low velocity zone similar to the structure beneath the western Atlantic. The model contains strong radial anisotropy in the lid where VSH is about 6% faster than VSV. This anisotropic feature ends at the bottom of the lithosphere at about the depth of 175 km in contrast to the Pacific where it extends to over 300 km. Another important feature of ATM is the weaker velocity gradient from the depth of 175 to 350 km compared to Pacific models, which may be related to differences in mantle flow.

  9. Radial Distribution Functions of Strongly Coupled Two-Temperature Plasmas

    Science.gov (United States)

    Shaffer, Nathaniel R.; Tiwari, Sanat Kumar; Baalrud, Scott D.

    2017-10-01

    We present tests of three theoretical models for the radial distribution functions (RDFs) in two-temperature strongly coupled plasmas. RDFs are useful in extending plasma thermodynamics and kinetic theory to strong coupling, but they are usually known only for thermal equilibrium or for approximate one-component model plasmas. Accurate two-component modeling is necessary to understand the impact of strong coupling on inter-species transport, e.g., ambipolar diffusion and electron-ion temperature relaxation. We demonstrate that the Seuferling-Vogel-Toeppfer (SVT) extension of the hypernetted chain equations not only gives accurate RDFs (as compared with classical molecular dynamics simulations), but also has a simple connection with the Yukawa OCP model. This connection gives a practical means to recover the structure of the electron background from knowledge of the ion-ion RDF alone. Using the model RDFs in Effective Potential Theory, we report the first predictions of inter-species transport coefficients of strongly coupled plasmas far from equilibrium. This work is supported by NSF Grant No. PHY-1453736, AFSOR Award No. FA9550-16-1-0221, and used XSEDE computational resources.

  10. Preliminary computer simulation of the effects of radial keratotomy.

    Science.gov (United States)

    Hanna, K D; Jouve, F E; Waring, G O

    1989-06-01

    We created a computerized mathematical model of the eye for the simulation of refractive surgery. This model used a slightly prolate shape for a moderately myopic eye and an idealized aspheric profile for the cornea. The finite element method and the nonlinear Mooney-Rivelin law were used to analyze stress-strain relationships. Radial keratotomy changes stress distribution in the cornea and the anterior sclera, with major changes at the paracentral and peripheral ends of the incisions. The model predicted that there would be a flattening of the central cornea with a posterior displacement, which increased with an increase in intraocular pressure. A change in the length of the incision of 0.5 mm produced a significant change in correction. For small clear zones (3 to 4 mm), incisions of equal length produced comparable changes in refraction. We found that the effect of the corneal radius of curvature on the amount of refractive change was negligible. We studied the effect of elasticity coefficients and corneal anisotropia.

  11. Boiling radial flow in fractures of varying wall porosity

    Energy Technology Data Exchange (ETDEWEB)

    Barnitt, Robb Allan

    2000-06-01

    The focus of this report is the coupling of conductive heat transfer and boiling convective heat transfer, with boiling flow in a rock fracture. A series of experiments observed differences in boiling regimes and behavior, and attempted to quantify a boiling convection coefficient. The experimental study involved boiling radial flow in a simulated fracture, bounded by a variety of materials. Nonporous and impermeable aluminum, highly porous and permeable Berea sandstone, and minimally porous and permeable graywacke from The Geysers geothermal field. On nonporous surfaces, the heat flux was not strongly coupled to injection rate into the fracture. However, for porous surfaces, heat flux, and associated values of excess temperature and a boiling convection coefficient exhibited variation with injection rate. Nucleation was shown to occur not upon the visible surface of porous materials, but a distance below the surface, within the matrix. The depth of boiling was a function of injection rate, thermal power supplied to the fracture, and the porosity and permeability of the rock. Although matrix boiling beyond fracture wall may apply only to a finite radius around the point of injection, higher values of heat flux and a boiling convection coefficient may be realized with boiling in a porous, rather than nonporous surface bounded fracture.

  12. Radial Profiles of Saturn’s Phoebe Ring

    Science.gov (United States)

    Tamayo, Daniel; Markham, Stephen; Hedman, Matthew M.; Burns, Joseph A.

    2015-11-01

    In 2009, the Spitzer observatory discovered a vast circumplanetary dust ring around Saturn, sourced by its swarm of irregular satellites. This material had been hypothesized to exist, in order to blanket Iapetus’ leading face and create its stark hemispherical dichotomy. Unfortunately, observations from near-Earth space cannot probe how far inward the Phoebe ring extends, as they are overwhelmed by scattered light from the planet. Additionally, to date, such measurements have only been achieved of thermal emission in the mid-infrared.By contrast, we present results from recent observations with the Cassini spacecraft (in orbit about Saturn) at optical wavelengths. Using a novel observational technique that exploits the moving shadow cast by Saturn, we mitigate the scattered light and background, and have been able to clearly extract the exceedingly faint Phoebe ring signal (line-of-sight optical depth of 10e-9, surface brightness of roughly 27 mag/arcsec^2).Our extracted albedos are consistent with dark material liberated from the irregular satellites. Additionally, we present reconstructed radial profiles over the broad range of distances from Saturn spanned by our observations. We also connect these results to theoretical models of the size-dependent dynamics of Phoebe ring dust grains under the action of the relevant perturbations.

  13. Extracting the Radial Profile of Saturn's Phoebe Ring

    Science.gov (United States)

    Tamayo, Daniel; Markham, Stephen R.; Hedman, Matthew M.; Burns, Joseph A.

    2014-11-01

    Saturn is famous for its dramatic main rings. Less well known is that two orders of magnitude further away from the planet, Saturn also hosts the solar system’s largest known circumplanetary ring. This Phoebe ring is likely sourced by collisions with Saturn’s largest irregular satellite Phoebe, and presents an important opportunity to learn more generally about the collisional evolution of this distant population of irregular satellites. Debris from such collisions is likely ultimately responsible for the dramatic two-faced coloration of the odd moon Iapetus.We present results from recent observations with the Cassini spacecraft (in orbit about Saturn) in scattered optical light. Using a novel observational technique that exploits the moving shadow cast by Saturn, we have been able to clearly extract the exceedingly faint Phoebe ring signal (line-of-sight optical depth ˜ 10e-9, surface brightness ˜ 27 mag/arcsec^2). Additionally, we present reconstructed radial profiles over the broad range of distances from Saturn spanned by our observations.

  14. Analysis of radial electric field in LHD towards improved confinement

    Energy Technology Data Exchange (ETDEWEB)

    Yokoyama, M.; Ida, K.; Sanuki, H.; Itoh, K.; Narihara, K.; Tanaka, K.; Kawahata, K.; Ohyabu, N.

    2001-05-01

    The radial electric field (E{sub r}) properties in LHD have been investigated to indicate the guidance towards improved confinement with possible E{sub r} transition and bifurcation. The ambipolar E{sub r} is obtained from the neoclassical flux based on the analytical formulae. This approach is appropriate to clarify ambipolar E{sub r} properties in a wide range of temperature and density in a more transparent way. The comparison between calculated E{sub r} and experimentally measured one has shown the qualitatively good agreement such as the threshold density for the transition from ion root to electron root. The calculations also well reproduce the experimentally observed tendency that the electron root is possible by increasing temperatures even for higher density and the ion root is enhanced for higher density. Based on the usefulness of this approach to analyze E{sub r} in LHD, calculations in a wide range have been performed to clarify the parameter region of interest where multiple solutions of E{sub r} can exist. This is the region where E{sub r} transition and bifurcation may be realized as already experimentally confirmed in CHS. The systematic calculations give a comprehensive understandings of experimentally observed E{sub r} properties, which indicates an optimum path towards improved confinement. (author)

  15. Radially Symmetric Motions of Nonlinearly Viscoelastic Bodies Under Live Loads

    Science.gov (United States)

    Stepanov, Alexey B.; Antman, Stuart S.

    2017-12-01

    This paper treats radially symmetric motions of nonlinearly viscoelastic circular-cylindrical and spherical shells subjected to the live loads of centrifugal force and (time-dependent) hydrostatic pressures. The governing equations are exact versions of those for 3-dimensional continuum mechanics (so shell does not connote an approximate via some shell theory). These motions are governed by quasilinear third-order parabolic-hyperbolic equations having but one independent spatial variable. The principal part of such a partial differential equation is determined by a general family of nonlinear constitutive equations. The presence of strains in two orthogonal directions requires a careful treatment of constitutive restrictions that are physically natural and support the analysis. The interaction of geometrically exact formulations, the compatible use of general constitutive equations for material response, and the presence of live loads show how these factors play crucial roles in the behavior of solutions. In particular, for different kinds of live loads there are thresholds separating materials that produce qualitatively different dynamical behavior. The analysis (using classical methods) covers infinite-time blowup for cylindrical shells subject to centrifugal forces, infinite-time blowup for cylindrical shells subject to steady and time-dependent hydrostatic pressures, finite-time blowup for spherical shells subject to steady and time-dependent hydrostatic pressures, and the preclusion of total compression. This paper concludes with a sketch (using some modern methods) of the existence of regular solutions until the time of blowup.

  16. Meshfree Local Radial Basis Function Collocation Method with Image Nodes

    Energy Technology Data Exchange (ETDEWEB)

    Baek, Seung Ki; Kim, Minjae [Pukyong National University, Busan (Korea, Republic of)

    2017-07-15

    We numerically solve two-dimensional heat diffusion problems by using a simple variant of the meshfree local radial-basis function (RBF) collocation method. The main idea is to include an additional set of sample nodes outside the problem domain, similarly to the method of images in electrostatics, to perform collocation on the domain boundaries. We can thereby take into account the temperature profile as well as its gradients specified by boundary conditions at the same time, which holds true even for a node where two or more boundaries meet with different boundary conditions. We argue that the image method is computationally efficient when combined with the local RBF collocation method, whereas the addition of image nodes becomes very costly in case of the global collocation. We apply our modified method to a benchmark test of a boundary value problem, and find that this simple modification reduces the maximum error from the analytic solution significantly. The reduction is small for an initial value problem with simpler boundary conditions. We observe increased numerical instability, which has to be compensated for by a sufficient number of sample nodes and/or more careful parameter choices for time integration.

  17. Radial structure of the constricted positive column: Modeling and experiment

    Science.gov (United States)

    Golubovskii, Yu.; Kalanov, D.; Maiorov, V.

    2017-08-01

    We present a detailed self-consistent model of a positive column in argon glow discharge at moderate pressures and currents. This model describes the discharge transition between diffuse and constricted states. The model includes an extensive set of plasma chemical reactions and equation for inhomogeneous gas heating. The nonequilibrium behavior of an electron distribution function is also considered. One of the main features of the model is an accurate treatment of radiation trapping by solving the Holstein-Biberman equation directly. Influence of the radiation trapping on macroscopic parameters of the constricted positive column is studied. We propose a method for solving a boundary-value problem, including particle and energy balance equations for electrons, ground state atoms, atomic and molecular ions, and excited species. Unlike traditional solution approaches for similar systems, the method provides continuous Z- and S-shaped characteristics of discharge parameters, describing hysteresis in transition between diffuse and constricted discharge regimes. Performed experiments include measurements of volt-ampere characteristics and spectroscopic study of radial density profiles of excited atoms by measuring line emission and absorption, and electrons by measuring bremsstrahlung intensity. The role of resonance radiation trapping in spatial redistribution of 1 s and 2 p states of argon is demonstrated. Results of modeling are compared to the experimental data.

  18. Design Optimization of Centrifugal Pump Using Radial Basis Function Metamodels

    Directory of Open Access Journals (Sweden)

    Yu Zhang

    2014-05-01

    Full Text Available Optimization design of centrifugal pump is a typical multiobjective optimization (MOO problem. This paper presents an MOO design of centrifugal pump with five decision variables and three objective functions, and a set of centrifugal pumps with various impeller shroud shapes are studied by CFD numerical simulations. The important performance indexes for centrifugal pump such as head, efficiency, and required net positive suction head (NPSHr are investigated, and the results indicate that the geometry shape of impeller shroud has strong effect on the pump's performance indexes. Based on these, radial basis function (RBF metamodels are constructed to approximate the functional relationship between the shape parameters of impeller shroud and the performance indexes of pump. To achieve the objectives of maximizing head and efficiency and minimizing NPSHr simultaneously, multiobjective evolutionary algorithm based on decomposition (MOEA/D is applied to solve the triobjective optimization problem, and a final design point is selected from the Pareto solution set by means of robust design. Compared with the values of prototype test and CFD simulation, the solution of the final design point exhibits a good consistency.

  19. Modelling nonstationary Doppler noise in exoplanetary radial velocity data

    Science.gov (United States)

    Baluev, Roman V.

    2015-08-01

    We construct a new class of analytic nonstationary noise models for exoplanetary Doppler data. The observable correlated noise is represented as a convolution of a parent activity process with a given memory function. The model honours the casuality principle, meaning that only past values of the activity may affect the observable value. This model does not approximate detailedly any real stellar activity phenomena, but it becomes mathematically simple, simultaneously satisfying the basic natural principles of physical sensibility and self-consistency.Additionally, we develop a new type of periodograms that can be used to detect periodic modulations in the Doppler noise characteristics, rather than in the observed radial velocity curve itself. We present first results of applying this technique to public Doppler time series available for a set of planet-hosting stars.This work was supported by the Russian Foundation for Basic Research (project No. 14-02-92615 KO_a), the UK Royal Society International Exchange grant IE140055, by the President of Russia grant for young scientists (No. MK-733.2014.2), by the programme of the Presidium of Russian Academy of Sciences P21, and by the Saint Petersburg State University research grant 6.37.341.2015.

  20. Automated Freehand Sketch Segmentation Using Radial Basis Functions.

    Science.gov (United States)

    Pu, Jiantao; Gur, David

    2009-12-01

    Freehand sketching is widely regarded as an efficient and natural way for interaction between computers and humans. We present a robust computerized scheme to automatically segment freehand sketches into a series of components with specific geometric meaning regardless of whether these are generated online or offline. This task is a necessary first step toward sketch understanding. By exploiting the interpolation / extrapolation characteristic of Radial Basis Functions (RBFs), a greedy algorithm consisting of forward and backward operations is proposed for finding the minimum set of segmentation points that can be used to reconstruct with high fitting accuracy freehand sketches in the form of implicit functions. To obtain segmentation points, a simple angle based rule is used to remove "bridging" points that provide a smooth transition between consecutive sketch components. Feasibility of the proposed algorithm is demonstrated by a preliminary performance assessment study using ten computer generated drawings. These experiments show that in this dataset sensitivity of the segmentation was higher than 97.5% with a false positive (FP) rate of approximately 25%. The majority of false positive identifications are located on arc regions where a larger number of segmentation points are needed for reconstruction purposes. The primary contribution of this algorithm is that it transforms an ambiguous problem namely, freehand sketch segmentation, into an implicit function fitting operation. Therefore, this proposed approach has several advantages including independence of the actual sketching activity, and the ability for a satisfactory detection of the transition point between a line and an arc or between two arcs.

  1. Splint satisfaction in the treatment of traumatic radial nerve injuries.

    Science.gov (United States)

    Alsancak, S

    2003-08-01

    Between the years 1986-2001, 135 patients who have had traumatic radial nerve injury, were supplied with dynamic wrist-hand orthoses (WHOs). The aim of this study is to examine the applied splints, considering aspects such as apperance, practicality of use, function, comfort and endurance. The author's assessments show that the biggest problem was due to the unaesthetic appearance of the finger extensor spring of the splints. For this reason, modification of these finger extensor outriggers has been attempted. Also, aspects of the splints such as the problems faced and regeneration of the nerve, have been considered and modifications made in order to eliminate any disfunction. This study reflects the reactions and satisfaction of 83 patients concerning the splints they have used. Conventional wire springs have been used in the splints of 71 patients, and 12 had modifications done on their outriggers. In terms of appearance, there were significant differences between modified outriggers and conventional outrigger (p < 0.05). Also, when the modified outriggers were compared in terms of appearance and durability, there was a statistically significant opinion in favour of them (p < 0.01).

  2. Time efficient aeroelastic simulations based on radial basis functions

    Science.gov (United States)

    Liu, Wen; Huang, ChengDe; Yang, Guowei

    2017-02-01

    Aeroelasticity studies the interaction between aerodynamic forces and structural responses, and is one of the fundamental problems to be considered in the design of modern aircraft. The fluid-structure interpolation (FSI) and mesh deformation are two key issues in the CFD-CSD coupling approach (the partitioned approach), which is the mainstream numerical strategy in aeroelastic simulations. In this paper, a time efficient coupling scheme is developed based on the radial basis function interpolations. During the FSI process, the positive definite system of linear equations is constructed with the introduction of pseudo structural forces. The acting forces on the structural nodes can be calculated more efficiently via the solution of the linear system, avoiding the costly computations of the aerodynamic/structural coupling matrix. The multi-layer sequential mesh motion algorithm (MSM) is proposed to improve the efficiency of the volume mesh deformations, which is adequate for large-scale time dependent applications with frequent mesh updates. Two-dimensional mesh motion cases show that the MSM algorithm can reduce the computing cost significantly compared to the standard RBF-based method. The computations of the AGARD 445.6 wing flutter and the static deflections of the three-dimensional high-aspect-ratio aircraft demonstrate that the developed coupling scheme is applicable to both dynamic and static aeroelastic problems.

  3. Dynamics of learning near singularities in radial basis function networks.

    Science.gov (United States)

    Wei, Haikun; Amari, Shun-Ichi

    2008-09-01

    The radial basis function (RBF) networks are one of the most widely used models for function approximation in the regression problem. In the learning paradigm, the best approximation is recursively or iteratively searched for based on observed data (teacher signals). One encounters difficulties in such a process when two component basis functions become identical, or when the magnitude of one component becomes null. In this case, the number of the components reduces by one, and then the reduced component recovers as the learning process proceeds further, provided such a component is necessary for the best approximation. Strange behaviors, especially the plateau phenomena, have been observed in dynamics of learning when such reduction occurs. There exist singularities in the space of parameters, and the above reduction takes place at the singular regions. This paper focuses on a detailed analysis of the dynamical behaviors of learning near the overlap and elimination singularities in RBF networks, based on the averaged learning equation that is applicable to both on-line and batch mode learning. We analyze the stability on the overlap singularity by solving the eigenvalues of the Hessian explicitly. Based on the stability analysis, we plot the analytical dynamic vector fields near the singularity, which are then compared to those real trajectories obtained by a numeric method. We also confirm the existence of the plateaus in both batch and on-line learning by simulation.

  4. A rare case of Goldenhar syndrome with radial aplasia.

    Science.gov (United States)

    Biswas, S; Adhikari, A; Meyur, R; Kundu, P

    2013-11-01

    Goldenhar syndrome (GS) is a well-recognised condition characterised by variable degree of uni- or bilateral involvement of craniofacial structures involving first and second branchial arches manifesting ocular and auricular anomalies and also vertebral defect. This syndrome presents at birth and its exact aetiology is still unknown. The affections of the neural crest cells may have some role in the multiple malformations of the GS. We present a teenaged female case who attended the Orthopaedic Outpatient Department to receive handicapped certificate in Bankura Sammilani Medical College and Hospital. She had multiple skeletal abnormalities, which included hemifacial microsomia, vertebral malformations in the form of scoliosis, distorted pelvis, but the most striking feature was the absence of thumb and aplasia of radius of left side. She did not suffer from any ocular or auricular abnormalities, neither from any cardiological, urogenital or gastroenteric ones. Radial defects associated with GS might represent a subset within this spectrum. Our case probably belongs to this subset, therefore is a very rare one.

  5. Sparse Reconstruction of Electric Fields from Radial Magnetic Data

    Science.gov (United States)

    Yeates, Anthony R.

    2017-02-01

    Accurate estimates of the horizontal electric field on the Sun’s visible surface are important not only for estimating the Poynting flux of magnetic energy into the corona but also for driving time-dependent magnetohydrodynamic models of the corona. In this paper, a method is developed for estimating the horizontal electric field from a sequence of radial-component magnetic field maps. This problem of inverting Faraday’s law has no unique solution. Unfortunately, the simplest solution (a divergence-free electric field) is not realistically localized in regions of nonzero magnetic field, as would be expected from Ohm’s law. Our new method generates instead a localized solution, using a basis pursuit algorithm to find a sparse solution for the electric field. The method is shown to perform well on test cases where the input magnetic maps are flux balanced in both Cartesian and spherical geometries. However, we show that if the input maps have a significant imbalance of flux—usually arising from data assimilation—then it is not possible to find a localized, realistic, electric field solution. This is the main obstacle to driving coronal models from time sequences of solar surface magnetic maps.

  6. Evaluation of associated carpal bone fractures in distal radial fractures.

    Science.gov (United States)

    Heo, Youn Moo; Kim, Sang Bum; Yi, Jin Woong; Lee, Jung Bum; Park, Cheol Yong; Yoon, Jeong Yong; Kim, Doo Hyun

    2013-06-01

    The purpose of this study was to investigate the frequency and distribution of associated carpal bone fractures (CBFs) in distal radial fractures (DRFs). Three hundred and thirteen patients who underwent surgical treatment for DRFs between March 2007 and January 2010 were reviewed retrospectively. In this study, 223 patients who had preoperative computed tomography (CT) were included. We investigated the frequency and distribution of associated CBFs on CT scans. The relationship between the frequency of associated CBFs and patient factors such as age, gender, body mass index, and the mechanism of injury was assessed. CBFs were complicated in 46 of 223 DRFs (20.9%). The distribution of CBFs was 23 cases in the triquetrum, 16 in the lunate, 12 in the scaphoid, five in the hamate, and four in the pisiform. Among the 46 cases, a fracture of one carpal bone occurred in 36 cases, two in seven cases, three in two cases, and four in one case. In 10 of the 46 cases, associated CBFs occurred in more than two carpal bones. No significant differences were observed for age, sex, body mass index, or the mechanism of injury between patients with DRFs and CBFs and those without CBFs. Because CBFs that mainly occur in the proximal carpal row are complicated in DRFs at a relatively high frequency, assessment of carpal bones using CT scans is beneficial.

  7. Stellar Radial Velocities with IGRINS at McDonald Observatory

    Science.gov (United States)

    Mace, Gregory; Jaffe, Daniel; Park, Chan; Lee, Jae-Joon

    2016-06-01

    Exoplanet searches with dedicated instrumentation have made 1 m/s radial velocity (RV) precision routine.Yet, RVs for large samples of stars generally remain at the 1km/s level.TheImmersion Grating Infrared Spectrometer (IGRINS) is a revolutionary instrument that exploits broad spectral coverage at high-resolution in the near-infrared.IGRINS on the 2.7 meter Harlan J. Smith Telescope at McDonald Observatory is nearly as sensitive as CRIRES at the 8 meter Very Large Telescope. However, IGRINS at R=45,000 has more than 30 times the spectral grasp of CRIRES.The use of a silicon immersion grating facilitates a compact cryostat while providing simultaneous wavelength coverage from 1.45 - 2.45 microns. Wehave developed a pipeline to cross-correlate the more than 20,000 resolution elements in two IGRINS exposures and provide relative RVs with uncertainties of 50m/s (<1% of a resolution element). Absolute RVs are limited by thezero point uncertainty, which is 150m/s.IGRINS RVs will be provided for thousands of objects per year as a default procedure of the data reduction pipeline, creating a legacy product for multi-epoch studies of low-mass, stellar and substellar multiplicity.

  8. Variation of Drying Strains between Tangential and Radial Directions in Asian White Birch

    Directory of Open Access Journals (Sweden)

    Zongying Fu

    2016-03-01

    Full Text Available In this study, wood disks of 30 mm in thickness cut from white birch (Betula platyphylla Suk logs were dried at a constant temperature (40 °C. The drying strains including practical shrinkage strain, elastic strain, viscoelastic creep strain and mechano-sorptive creep were measured both tangentially and radially. The effects of moisture content and radial position on each strain were also discussed qualitatively. Overall, the difference of the practical shrinkage strain between the tangential and radial directions was proportional to the distance from the pith. The tangential elastic strain and viscoelastic creep strain were higher than these strains in a radial direction, and they all decreased with the decrease of moisture content. Additionally, there were opposite mechano-sorptive creep between tangential and radial directions.

  9. PROLONGED RADIAL ARTERY SPASM IN THE CATHETERIZATION LABORATORY - RELIEF BY PHARMACOLOGICAL INTERVENTION

    Directory of Open Access Journals (Sweden)

    Krishna Kumar

    2010-11-01

    Full Text Available Radial spasm is often very prolonged and painful to the patient. Here, we describe a novel way to deal with the same. The total spasm lasted over 4 hours. A 3.4 6 JR catheter was introduced via the femoral route and papav arine one ampoule was injected directly into the right subclavian artery. After about 10 min we were able to pull out the radial catheter. Radial angiography is a simple procedure with reportedly less complications 1,2. How ever ,it has one major complication radial spasm. We describe here a patient with radial spasm that persisted for more than 2 hours and how we dealt with it.

  10. Radial-velocity study of 18 emission-line B stars

    Energy Technology Data Exchange (ETDEWEB)

    Jarad, M.M.; Hilditch, R.W.; Skillen, Ian (Saint Andrews Univ. (UK). Observatory)

    1989-06-01

    A total of 647 radial velocities of 18 northern-hemisphere Be stars obtained over two observing seasons (1983-1985) are presented. These velocities have been determined by the cross-correlation technique applied to selected spectral regions avoiding the hydrogen lines and including the He I lines. Analyses of these data via Fourier techniques suggest that three new spectroscopic binaries are discovered and that seven stars show variability in radial velocity which may be attributable to radial or non-radial pulsation. Four known binary orbits are confirmed. Only four stars in the sample are found to have constant radial velocity. These results strengthen and extend the evidence that the Be phenomenon can result from pulsational instability and that the proportion of binary systems amongst Be stars is about the same as the normal stellar populations. (author).

  11. Radial sesamoid bone as a part of the manipulation system in the lesser panda (Ailurus fulgens).

    Science.gov (United States)

    Endo, H; Sasaki, M; Kogiku, H; Yamamoto, M; Arishima, K

    2001-03-01

    The well-developed radial sesamoid bone presented a rod-like shape in the lesser panda. It could be separated into two components: (1) an ulnar cartilaginous, (2) a radial osseous part. The radial sesamoid bone was connected with four elements as follows: (1) the tendon of the M. abductor pollicis longus, (2) M. abductor pollicis brevis and M. opponens pollicis, (3) Aponeurosis palmaris, and (4) Flexor retinaculum. The bone made no articulation with the first metacarpal. The movement of the radial sesamoid bone may be controlled by the connecting muscles and muscle-related structures. It is suggested that the bone acts as a supporting ridge in the gripping action in the lesser panda. However, we suggest that the grasping mechanism is obviously different from that of the giant panda, in which the radial sesamoid bone is connected strongly with the first metacarpal.

  12. Enhanced radial transport and energization of radiation belt electrons due to drift orbit bifurcations.

    Science.gov (United States)

    Ukhorskiy, A Y; Sitnov, M I; Millan, R M; Kress, B T; Smith, D C

    2014-01-01

    [1]Relativistic electron intensities in Earth's outer radiation belt can vary by multiple orders of magnitude on the time scales ranging from minutes to days. One fundamental process contributing to dynamic variability of radiation belt intensities is the radial transport of relativistic electrons across their drift shells. In this paper we analyze the properties of three-dimensional radial transport in a global magnetic field model driven by variations in the solar wind dynamic pressure. We use a test particle approach which captures anomalous effects such as drift orbit bifurcations. We show that the bifurcations lead to an order of magnitude increase in radial transport rates and enhance the energization at large equatorial pitch angles. Even at quiet time fluctuations in dynamic pressure, radial transport at large pitch angles exhibits strong deviations from the diffusion approximation. The radial transport rates are much lower at small pitch angle values which results in a better agreement with the diffusion approximation.

  13. Radial probe endobronchial ultrasound for peripheral pulmonary lesions. A 5-year institutional experience.

    Science.gov (United States)

    Chen, Alexander; Chenna, Praveen; Loiselle, Andrea; Massoni, Jennifer; Mayse, Martin; Misselhorn, David

    2014-05-01

    Technological advances have improved the ability of bronchoscopists to access peripheral pulmonary lesions for tissue sampling. Radial probe endobronchial ultrasound (EBUS) provides real-time feedback to guide biopsies of peripheral lesions, thereby potentially improving diagnostic yield over conventional bronchoscopy. We assessed the overall diagnostic yield of peripheral bronchoscopy using radial probe EBUS for peripheral pulmonary lesions, as well as factors that might influence the diagnostic yield, such as radial ultrasound view, lesion size, and ability to locate the peripheral lesion. We conducted a retrospective review of peripheral bronchoscopy cases in which radial probe EBUS was utilized to diagnose peripheral pulmonary lesions at a tertiary care university hospital. Our study cohort comprised 496 patients who underwent bronchoscopies between January 2008 and December 2012 for the diagnosis of peripheral pulmonary lesions. Radial probe EBUS was used alone for diagnostic purposes in 467 patients. A diagnosis was made on that basis in 321 (69%) of 467 patients. A diagnosis was obtained for 83 of 144 (58%) of nodules 1-2 cm in diameter, 99 of 137 (72%) of nodules 2.1-3 cm, 54 of 70 (77%) of nodules 3.1-4 cm, 41 of 47 (87%) of nodules 4.1-5 cm, and 35 of 40 (88%) of nodules larger than 5.1 cm. Of all 467 nodules, 446 (96%) were successfully identified using radial probe EBUS. When the radial probe position was within the target lesion, the diagnostic yield was 84% compared with 48% when the probe was positioned adjacent to the lesion. Radial probe EBUS can be used to guide biopsy during peripheral bronchoscopy. This technique provides real-time ultrasound-based confirmation of target lesion localization prior to biopsy. Using radial probe EBUS, the vast majority of peripheral pulmonary nodules can be identified. Radial EBUS probe position relative to the target lesion significantly affects the diagnostic yield.

  14. Variação da Cor da Madeira de Teca em Função da Densidade e do Teor de Extrativos

    Directory of Open Access Journals (Sweden)

    Rosilei Aparecida Garcia

    Full Text Available RESUMO O objetivo deste estudo foi avaliar o efeito da densidade e do teor de extrativos na variação da cor da madeira de teca (Tectona grandis L. f. proveniente de plantios de diferentes espaçamentos. As análises colorimétricas foram realizadas nas faces radial e tangencial das madeiras de cerne e alburno com o espectrofotômetro CM 2600d no espaço de cor L*a*b*. A densidade e o teor de extrativos foram determinados segundo as normas ASTM D2395 e ASTM D1105. A madeira do maior espaçamento de plantio apresentou maior densidade e maior teor de extrativos. Na seção radial, as madeiras de cerne de maior densidade apresentaram mais pigmento amarelo, enquanto que na seção tangencial elas são mais escuras e apresentam menos pigmento amarelo. As madeiras de alburno de maior densidade são mais escuras e apresentam mais pigmento vermelho em ambas as seções. As madeiras mais escuras e com mais pigmento vermelho apresentaram um maior teor de extrativos.

  15. The galium arsenide (GaAs laser radiation in the radial nerve regeneration submitted to secundary surgical repair

    Directory of Open Access Journals (Sweden)

    Daniel Roulim Stainki

    1998-01-01

    Full Text Available Vinte e quatro cães adultos, sem raça definida, foram separados em quatro grupos e submetidos a neurotomia bilateral do nervo radial, em nível do terço distal do úmero e, 21 dias após, sofreram anastomose epineural secundária, término-terminal. Nos 10 dias subseqüentes à neuroanastomose, o membro esquerdo de todos os cães foi irradiado com laser arseneto de gálio no intuito de investigar sua influência na regeneração do nervo. O membro contralateral serviu como testemunha. A recuperação funcional foi verificada através da característica da deambulação, testes de sensibilidade e avaliação motora. Foram efetuadas biópsias bilaterais, na região de anastomose, aos 10 dias (grupo A, 30 dias (grupo B, 60 dias (grupo C e 90 dias (grupo D após a reconstituição cirúrgica, para estudo morfológico em microscopia óptica. A proliferação de tecido conjuntivo na linha de anastomose é a complicação mais séria no processo de regeneração nervosa. A radiação laser diminui a intensidade da resposta inflamatória ao fio de sutura, mas pode contribuir para a formação de neuroma mais exuberante.

  16. Radial diffusion of radiocaesium and radioiodide through cementitious backfill

    Science.gov (United States)

    Felipe-Sotelo, M.; Hinchliff, J.; Drury, D.; Evans, N. D. M.; Williams, S.; Read, D.

    The function of the backfill material in a geological disposal facility (GDF) is to chemically condition the environment of the near field and thereby chemically retard the transport of the radionuclides present in the waste. This function of the backfill material is usually referred to as chemical containment. Diffusion experiments are being carried out over periods up to four years to assess the diffusion of Cs, Ni, Eu, Th, U and I (as I-) through Nirex Reference Vault Backfill (NRVB). The method uses cylinders of NRVB (40 mm diameter, 40-45 mm height) which can be doped via a central well with the radionuclides of interest. Diffusion occurs radially into a surrounding solution already pre-equilibrated with the cement. This paper shows the results obtained during the first two years for experiments undertaken using 137Cs and 125I- tracers with and without carrier. Comparison is made to tritiated water under identical experimental conditions. Breakthrough of Cs and I- occurred within the first week of the experiments, reaching steady state in the surrounding solution after 20-50 days. The maximum concentrations expected from the original inventories based on a simple dilution calculation have not been reached, indicating that retention in the matrix has occurred; ranging from 10% to 40% for Cs, and up to 50% for I-. Corresponding experiments using a solution containing cellulose degradation products (CDP) showed an increased diffusion for both Cs and I. Migration profiles have been obtained and the relative retention of each radionuclide has been confirmed using digital autoradiography. The results indicate that, for both isotopes, migration occurs through the cement matrix rather than through microfissures. However, whereas Cs is homogeneously distributed within the blocks, there is evidence of zones of preferential I- accumulation even where concentrations in solution have reached steady state. Transport modelling using GoldSim has replicated experimental

  17. A synthesis of radial growth patterns preceding tree mortality

    Science.gov (United States)

    Cailleret, Maxime; Jansen, Steven; Robert, Elisabeth M.R.; Desoto, Lucia; Aakala, Tuomas; Antos, Joseph A.; Beikircher, Barbara; Bigler, Christof; Bugmann, Harald; Caccianiga, Marco; Cada, Vojtech; Camarero, Jesus J.; Cherubini, Paolo; Cochard, Herve; Coyea, Marie R.; Cufar, Katarina; Das, Adrian J.; Davi, Hendrik; Delzon, Sylvain; Dorman, Michael; Gea-Izquierdo, Guillermo; Gillner, Sten; Haavik, Laurel J.; Hartmann, Henrik; Heres, Ana-Maria; Hultine, Kevin R.; Janda, Pavel; Kane, Jeffrey M.; Kharuk, Vyacheslav I.; Kitzberger, Thomas; Klein, Tamir; Kramer, Koen; Lens, Frederic; Levanic, Tom; Calderon, Juan C. Linares; Lloret, Francisco; Lobo-Do-Vale, Raquel; Lombardi, Fabio; Lopez Rodriguez, Rosana; Makinen, Harri; Mayr, Stefan; Meszaros, IIona; Metsaranta, Juha M.; Minunno, Francesco; Oberhuber, Walter; Papadopoulos, Andreas; Peltoniemi, Mikko; Petritan, Any M.; Rohner, Brigitte; Sanguesa-Barreda, Gabriel; Sarris, Dimitrios; Smith, Jeremy M.; Stan, Amanda B.; Sterck, Frank; Stojanovic, Dejan B.; Suarez, Maria L.; Svoboda, Miroslav; Tognetti, Roberto; Torres-Ruiz, Jose M.; Trotsiuk, Volodymyr; Villalba, Ricardo; Vodde, Floor; Westwood, Alana R.; Wyckoff, Peter H.; Zafirov, Nikolay; Martinez-Vilalta, Jordi

    2017-01-01

    Tree mortality is a key factor influencing forest functions and dynamics, but our understanding of the mechanisms leading to mortality and the associated changes in tree growth rates are still limited. We compiled a new pan-continental tree-ring width database from sites where both dead and living trees were sampled (2970 dead and 4224 living trees from 190 sites, including 36 species), and compared early and recent growth rates between trees that died and those that survived a given mortality event. We observed a decrease in radial growth before death in ca. 84% of the mortality events. The extent and duration of these reductions were highly variable (1–100 years in 96% of events) due to the complex interactions among study species and the source(s) of mortality. Strong and long-lasting declines were found for gymnosperms, shade- and drought-tolerant species, and trees that died from competition. Angiosperms and trees that died due to biotic attacks (especially bark-beetles) typically showed relatively small and short-term growth reductions. Our analysis did not highlight any universal trade-off between early growth and tree longevity within a species, although this result may also reflect high variability in sampling design among sites. The intersite and interspecific variability in growth patterns before mortality provides valuable information on the nature of the mortality process, which is consistent with our understanding of the physiological mechanisms leading to mortality. Abrupt changes in growth immediately before death can be associated with generalized hydraulic failure and/or bark-beetle attack, while long-term decrease in growth may be associated with a gradual decline in hydraulic performance coupled with depletion in carbon reserves. Our results imply that growth-based mortality algorithms may be a powerful tool for predicting gymnosperm mortality induced by chronic stress, but not necessarily so for angiosperms and in case of intense drought or

  18. Extreme Precision Environmental Control for Next Generation Radial Velocity Spectrographs

    Science.gov (United States)

    Stefansson, Gudmundur K.; Hearty, Fred; Levi, Eric; Robertson, Paul; Mahadevan, Suvrath; Bender, Chad; Nelson, Matt; Halverson, Samuel

    2015-12-01

    Extreme radial velocity precisions of order 10cm/s will enable the discoveries of Earth-like planets around solar-type stars. Temperature and pressure variations inside a spectrograph can lead to thermomechanical instabilities in the optics and mounts, and refractive index variations in both the optical elements as well as the surrounding air. Together, these variations can easily induce instrumental drifts of several tens to hundreds of meters per second. Enclosing the full optical train in thermally stabilized high-vacuum environments minimizes such errors. In this talk, I will discuss the Environmental Control System (ECS) for the Habitable Zone Planet Finder (HPF) spectrograph: a near infrared (NIR) facility class instrument we will commission at the Hobby Eberly Telescope in 2016. The ECS will maintain the HPF optical bench stable at 180K at the sub milli-Kelvin level on the timescale of days, and at the few milli-Kelvin level over months to years. The entire spectrograph is kept under high-quality vacuum (controlled radiation shield outfitted with custom feedback electronics. High efficiency Multi-Layer Insulation (MLI) blankets, and a passive external thermal enclosure further isolate the optics from ambient perturbations. This environmental control scheme is versatile, suitable to stabilize both next generation NIR, and optical spectrographs. I will show how we are currently testing this control system for use with our design concept of the Extreme Precision Doppler Spectrograph (EPDS), the next generation optical spectrograph for the WIYN 3.5m telescope. Our most recent results from full-scale stability tests will be presented.

  19. A novel integrated 4-DOF radial hybrid magnetic bearing for MSCMG

    Energy Technology Data Exchange (ETDEWEB)

    Jinji, Sun; Ziyan, Ju [School of Instrumentation Science & Opto-electronics Engineering, Beijing University of Aeronautics and Astronautics, Science and Technology on Inertial Laboratory, Beijing 100191 (China); Weitao, Han, E-mail: hanweitaotao@163.com [CRRC Qingdao Sifang CO., LTD, Qingdao 266111 (China); Gang, Liu [School of Instrumentation Science & Opto-electronics Engineering, Beijing University of Aeronautics and Astronautics, Science and Technology on Inertial Laboratory, Beijing 100191 (China)

    2017-01-01

    This paper proposes a novel integrated radial hybrid magnetic bearing (RHMB) for application with the small-sized magnetically suspended control moment gyroscope (MSCMG), which can control four degrees of freedom (4-DOFs), including two radial translational DOFs and two radial tilting DOFs, and provide the axial passive resilience. The configuration and working principle of the RHMB are introduced. Mathematical models of radial force, axial resilience and moment are established by using equivalent magnetic circuit method (EMCM), from which the radial force–radial displacement, radial force–current relationships are derived, as well as axial resilience–axial displacement, moment–tilting angle and moment–current. Finite element method (FEM) is also applied to analyze the performance and characteristics of the RHMB. The analysis results are in good agreement with that calculated by the EMCM, which is helpful in designing, optimizing and controlling the RHMB. The comparisons between the performances of the integrated 4-DOF RHMB and the traditional 4-DOF RHMB are made. The contrast results indicate that the proposed integrated 4-DOF RHMB possesses better performance compared to the traditional structure, such as copper loss, current stiffness, and tilting current stiffness. - Highlights: • An integrated 4-DOF RHMB is proposed for the small-sized MSCMG. • The 4-DOF RHMB has good linear force–displacement and force–current characteristics. • The RHMB has good linear moment–current and the moment–tilting angle characteristic.

  20. Prediction and analysis of radial overcut in holes drilled by electrochemical machining process

    Science.gov (United States)

    Tajdari, Mehdi; Chavoshi, Saeed

    2013-09-01

    Radial overcut predictive models using multiple regression analysis, artificial neural network and co-active neurofuzzy inference system are developed to predict the radial overcut during electrochemical drilling with vacuum extraction of electrolyte. Four process parameters, electrolyte concentration, voltage, initial machining gap and tool feed rate, are selected to develop the models. The comparison between the results of the presented models shows that the artificial neural network and co-active neuro-fuzzy inference system models can predict the radial overcut with an average relative error of nearly 5%. Main effect and interaction plots are generated to study the effects of process parameters on the radial overcut. The analysis shows that the voltage, electrolyte concentration and tool feed rate have significant effect on radial overcut, respectively, while initial machining gap has a little effect. It is also found that the increase of the voltage and electrolyte concentration increases the radial overcut and the increase of the tool feed rate decreases the radial overcut.

  1. Bloom syndrome radials are predominantly non-homologous and are suppressed by phosphorylated BLM.

    Science.gov (United States)

    Owen, Nichole; Hejna, James; Rennie, Scott; Mitchell, Asia; Newell, Amy Hanlon; Ziaie, Navid; Moses, Robb E; Olson, Susan B

    2014-01-01

    Biallelic mutations in BLM cause Bloom syndrome (BS), a genome instability disorder characterized by growth retardation, sun sensitivity and a predisposition to cancer. As evidence of decreased genome stability, BS cells demonstrate not only elevated levels of spontaneous sister chromatid exchanges (SCEs), but also exhibit chromosomal radial formation. The molecular nature and mechanism of radial formation is not known, but radials have been thought to be DNA recombination intermediates between homologs that failed to resolve. However, we find that radials in BS cells occur over 95% between non-homologous chromosomes, and occur non-randomly throughout the genome. BLM must be phosphorylated at T99 and T122 for certain cell cycle checkpoints, but it is not known whether these modifications are necessary to suppress radial formation. We find that exogenous BLM constructs preventing phosphorylation at T99 and T122 are not able to suppress radial formation in BS cells, but are able to inhibit SCE formation. These findings indicate that BLM functions in 2 distinct pathways requiring different modifications. In one pathway, for which the phosphorylation marks appear dispensable, BLM functions to suppress SCE formation. In a second pathway, T99 and T122 phosphorylations are essential for suppression of chromosomal radial formation, both those formed spontaneously and those formed following interstrand crosslink damage.

  2. Numerical Simulation of Hydraulic Fracture Propagation Guided by Single Radial Boreholes

    Directory of Open Access Journals (Sweden)

    Tiankui Guo

    2017-10-01

    Full Text Available Conventional hydraulic fracturing is not effective in target oil development zones with available wellbores located in the azimuth of the non-maximum horizontal in-situ stress. To some extent, we think that the radial hydraulic jet drilling has the function of guiding hydraulic fracture propagation direction and promoting deep penetration, but this notion currently lacks an effective theoretical support for fracture propagation. In order to verify the technology, a 3D extended finite element numerical model of hydraulic fracturing promoted by the single radial borehole was established, and the influences of nine factors on propagation of hydraulic fracture guided by the single radial borehole were comprehensively analyzed. Moreover, the term ‘Guidance factor (Gf’ was introduced for the first time to effectively quantify the radial borehole guidance. The guidance of nine factors was evaluated through gray correlation analysis. The experimental results were consistent with the numerical simulation results to a certain extent. The study provides theoretical evidence for the artificial control technology of directional propagation of hydraulic fracture promoted by the single radial borehole, and it predicts the guidance effect of a single radial borehole on hydraulic fracture to a certain extent, which is helpful for planning well-completion and fracturing operation parameters in radial borehole-promoted hydraulic fracturing technology.

  3. Optimum Control for Nonlinear Dynamic Radial Deformation of Turbine Casing with Time-Varying LSSVM

    Directory of Open Access Journals (Sweden)

    Cheng-Wei Fei

    2015-01-01

    Full Text Available With the development of the high performance and high reliability of aeroengine, the blade-tip radial running clearance (BTRRC of high pressure turbine seriously influences the reliability and performance of aeroengine, wherein the radial deformation control of turbine casing has to be concerned in BTRRC design. To improve BTRRC design, the optimum control-based probabilistic optimization of turbine casing radial deformation was implemented using time-varying least square support vector machine (T-LSSVM by considering nonlinear material properties and dynamic thermal load. First the T-LSSVM method was proposed and its mathematical model was established. And then the nonlinear dynamic optimal control model of casing radial deformation was constructed with T-LSSVM. Thirdly, through the numerical experiments, the T-LSSVM method is demonstrated to be a promising approach in reducing additional design samples and improving computational efficiency with acceptable computational precision. Through the optimum control-based probabilistic optimization for nonlinear dynamic radial turbine casing deformation, the optimum radial deformation is 7.865 × 10−4 m with acceptable reliability degree 0.995 6, which is reduced by 7.86 × 10−5 m relative to that before optimization. These results validate the effectiveness and feasibility of the proposed T-LSSVM method, which provides a useful insight into casing radial deformation, BTRRC control, and the development of gas turbine with high performance and high reliability.

  4. Requirements for Radial Migration: How Does the Migrating Fraction Depend on Stellar Velocity Dispersion?

    Science.gov (United States)

    Tolfree, K. J. D.; Wyse, R. F. G.

    2014-03-01

    Radial migration is a mechanism that can rearrange the orbital angular momentum of stars in a spiral disk without inducing kinematic heating. When radial migration is very efficient, a large fraction of disk stars experience significant changes in their orbital angular momenta over a short period of time. Such scenarios have strong implications for the chemical and kinematic evolution of disk galaxies. We have undertaken an investigation of the physical dependencies of the efficiency of radial migration on stellar kinematics and spiral structure by deriving the fraction of stars that can migrate radially. In order for a star in a spiral disk to migrate radially, it must first be “captured” in a family of resonant orbits near the radius of corotation with a transient spiral pattern. To date, the only analytic criterion for capture has been for stars in circular orbits. We present the capture criterion for disk stars on non-circular orbits. We then use our analytically derived capture criterion to model the radial distribution of the captured fraction in an exponential disk with a flat rotation curve. Further, we derive the dependence of the total captured fraction in the disk on the radial component of the stellar velocity dispersion (σR) and the amplitude of the spiral perturbation to the underlying potential evaluated at corotation (|Φs|CR). We find that within an annulus centered around corotation where σR is constant, the captured fraction goes as e-σR2/|Φs|CR.

  5. Radial-Velocity Variability of the Sun as a Star with HAPRS And HAPRS-N

    Science.gov (United States)

    Haywood, Raphaëlle D.; Collier Cameron, Andrew; Dumusque, Xavier; Glenday, Alex; Latham, David W.; Lovis, Christophe; Maldonado, Jesus; Micela, Giusi; Molinari, Emiliano; Mortier, Annelies; Pepe, Francesco; Phillips, David F.; Udry, Stephane

    2016-06-01

    Since we can resolve the surface of the Sun directly, we can explore the origin of radial-velocity variations induced by individual solar surface features such as faculae/plage, sunspots and granulation.I will present my recent investigation of the radial-velocity variations of the Sun as a star, based on high-resolution HARPS spectra of reflected sunlight and simultaneous images from the Solar Dynamics Observatory. We found that faculae are the dominant source of activity-induced radial-velocity variations, via suppression of convective blueshift. We investigated possible proxies for activity-induced radial-velocity variations and found that optical lightcurves can only provide a partial representation of these signals; the full-disc magnetic flux, however, is an excellent tracer. In addition to this dataset, the HARPS-N spectrograph has been operating with a new solar telescope feed since 2015 July. I will present results from the first year observations, which show radial-velocity variations of up to 7-8 m/s.Identifying proxies for solar radial-velocity variations is key to understanding the radial-velocity variability of other Sun-like stars, and is also essential for other investigations such as exoplanet detection surveys.

  6. The radial-hedgehog solution in Landau–de Gennes' theory for nematic liquid crystals

    KAUST Repository

    MAJUMDAR, APALA

    2011-09-06

    We study the radial-hedgehog solution in a three-dimensional spherical droplet, with homeotropic boundary conditions, within the Landau-de Gennes theory for nematic liquid crystals. The radial-hedgehog solution is a candidate for a global Landau-de Gennes minimiser in this model framework and is also a prototype configuration for studying isolated point defects in condensed matter physics. The static properties of the radial-hedgehog solution are governed by a non-linear singular ordinary differential equation. We study the analogies between Ginzburg-Landau vortices and the radial-hedgehog solution and demonstrate a Ginzburg-Landau limit for the Landau-de Gennes theory. We prove that the radial-hedgehog solution is not the global Landau-de Gennes minimiser for droplets of finite radius and sufficiently low temperatures and prove the stability of the radial-hedgehog solution in other parameter regimes. These results contain quantitative information about the effect of geometry and temperature on the properties of the radial-hedgehog solution and the associated biaxial instabilities. © Copyright Cambridge University Press 2011.

  7. Blade bowing effects on radial equilibrium of inlet flow in axial compressor cascades

    Directory of Open Access Journals (Sweden)

    Han XU

    2017-10-01

    Full Text Available The circumferentially averaged equation of the inlet flow radial equilibrium in axial compressor was deduced. It indicates that the blade inlet radial pressure gradient is closely related to the radial component of the circumferential fluctuation (CF source item. Several simplified cascades with/without aerodynamic loading were numerically studied to investigate the effects of blade bowing on the inlet flow radial equilibrium. A data reduction program was conducted to obtain the CF source from three-dimensional (3D simulation results. Flow parameters at the passage inlet were focused on and each term in the radial equilibrium equation was discussed quantitatively. Results indicate that the inviscid blade force is the inducement of the inlet CF due to geometrical asymmetry. Blade bowing induces variation of the inlet CF, thus changes the radial pressure gradient and leads to flow migration before leading edge (LE in the cascades. Positive bowing drives the inlet flow to migrate from end walls to mid-span and negative bowing turns it to the reverse direction to build a new equilibrium. In addition, comparative studies indicate that the inlet Mach number and blade loading can efficiently impact the effectiveness of blade bowing on radial equilibrium in compressor design.

  8. Functional Dicer Is Necessary for Appropriate Specification of Radial Glia during Early Development of Mouse Telencephalon

    Science.gov (United States)

    Nowakowski, Tomasz Jan; Mysiak, Karolina Sandra; Pratt, Thomas; Price, David Jonathan

    2011-01-01

    Early telencephalic development involves transformation of neuroepithelial stem cells into radial glia, which are themselves neuronal progenitors, around the time when the tissue begins to generate postmitotic neurons. To achieve this transformation, radial precursors express a specific combination of proteins. We investigate the hypothesis that micro RNAs regulate the ability of the early telencephalic progenitors to establish radial glia. We ablate functional Dicer, which is required for the generation of mature micro RNAs, by conditionally mutating the Dicer1 gene in the early embryonic telencephalon and analyse the molecular specification of radial glia as well as their progeny, namely postmitotic neurons and basal progenitors. Conditional mutation of Dicer1 from the telencephalon at around embryonic day 8 does not prevent morphological development of radial glia, but their expression of Nestin, Sox9, and ErbB2 is abnormally low. The population of basal progenitors, which are generated by the radial glia, is disorganised and expanded in Dicer1-/- dorsal telencephalon. While the proportion of cells expressing markers of postmitotic neurons is unchanged, their laminar organisation in the telencephalic wall is disrupted suggesting a defect in radial glial guided migration. We found that the laminar disruption could not be accounted for by a reduction of the population of Cajal Retzius neurons. Together, our data suggest novel roles for micro RNAs during early development of progenitor cells in the embryonic telencephalon. PMID:21826226

  9. Near surface radial anisotropy in the Rigan area/SE Iran

    Science.gov (United States)

    Shirzad, Taghi; Shomali, Zaher-Hossein; Riahi, Mohammad-Ali; Jarrahi, Maziar

    2017-01-01

    By analyzing Rayleigh and Love wave empirical Green's functions extracted from ambient seismic noise and earthquake data, we obtained near surface radial anisotropy structure beneath the hidden part of the Kahurak fault in the Rigan region, in the southeast of Iran. The deduced seismic radial anisotropy within the hidden part of the Kahurak fault can reveal record of shallow crustal deformation caused by the Rigan earthquake (MW 6.5) occurred on 20 December 2010. Significant radial anisotropy with positive magnitude (VSH > VSV) appears in the shallow subsurface of the upper part of the crust. The magnitude of radial anisotropy varies from predominantly positive (VSH > VSV) to mostly negative (VSH VSV) values with increasing depth which is correlated with a known sedimentary layer. The sedimentary layer is observed with prominent positive radial anisotropy (VSH > VSV). The thickness of the sedimentary layer varies between 1 and 3 km from the south to the north beneath the study area with an average radial anisotropy of about 5%. However, cross-section profiles indicate that negative anomaly stretches inside a thick sedimentary layer where the aftershocks occurred. Also, the investigation of cross-section profiles reveals that a dipping angle of the hidden part of Kahurak fault is resolved at approximately 85° using the anisotropy pattern. Moreover, the aftershocks generally occurred in the transitional zones where signs of radial anisotropy anomalies change. Our study indicates that the influence of different resolving powers and path coverage density of Rayleigh and Love waves, which can be artificially interpreted as radial anisotropy, have minor effect on calculated radial anisotropy and they are estimated in the range of - 2% to + 2%.

  10. On improved confinement in mirror plasmas by a radial electric field

    Science.gov (United States)

    Ågren, O.; Moiseenko, V. E.

    2017-11-01

    A weak radial electric field can suppress radial excursions of a guiding center from its mean magnetic surface. The physical origin of this effect is the smearing action by a poloidal E × B rotation, which tend to cancel out the inward and outward radial drifts. A use of this phenomenon may provide larger margins for magnetic field shaping with radial confinement of particles maintained in the collision free idealization. Mirror fields, stabilized by a quadrupolar field component, are of particular interest for their MHD stability and the possibility to control the quasi neutral radial electric field by biased potential plates outside the confinement region. Flux surface footprints on the end tank wall have to be traced to avoid short-circuiting between biased plates. Assuming a robust biasing procedure, moderate voltage demands for the biased plates seems adequate to cure even the radial excursions of Yushmanov ions which could be locally trapped near the mirrors. Analytical expressions are obtained for a magnetic quadrupolar mirror configuration which possesses minimal radial magnetic drifts in the central confinement region. By adding a weak controlled radial quasi-neutral electric field, the majority of gyro centers are predicted to be forced to move even closer to their respective mean magnetic surface. The gyro center radial coordinate is in such a case an accurate approximation for a constant of motion. By using this constant of motion, the analysis is in a Vlasov description extended to finite β. A correspondence between that Vlasov system and a fluid description with a scalar pressure and an electric potential is verified. The minimum B criterion is considered and implications for flute mode stability in the considered magnetic field is analyzed. By carrying out a long-thin expansion to a higher order, the validity of the calculations are extended to shorter and more compact device designs.

  11. Asymmetry of Radial and Symmetry of Tangential Neuronal Migration Pathways in Developing Human Fetal Brains.

    Science.gov (United States)

    Miyazaki, Yuta; Song, Jae W; Takahashi, Emi

    2016-01-01

    The radial and tangential neural migration pathways are two major neuronal migration streams in humans that are critical during corticogenesis. Corticogenesis is a complex process of neuronal proliferation that is followed by neuronal migration and the formation of axonal connections. Existing histological assessments of these two neuronal migration pathways have limitations inherent to microscopic studies and are confined to small anatomic regions of interest (ROIs). Thus, little evidence is available about their three-dimensional (3-D) fiber pathways and development throughout the entire brain. In this study, we imaged and analyzed radial and tangential migration pathways in the whole human brain using high-angular resolution diffusion MR imaging (HARDI) tractography. We imaged ten fixed, postmortem fetal (17 gestational weeks (GW), 18 GW, 19 GW, three 20 GW, three 21 GW and 22 GW) and eight in vivo newborn (two 30 GW, 34 GW, 35 GW and four 40 GW) brains with no neurological/pathological conditions. We statistically compared the volume of the left and right radial and tangential migration pathways, and the volume of the radial migration pathways of the anterior and posterior regions of the brain. In specimens 22 GW or younger, the volume of radial migration pathways of the left hemisphere was significantly larger than that of the right hemisphere. The volume of posterior radial migration pathways was also larger when compared to the anterior pathways in specimens 22 GW or younger. In contrast, no significant differences were observed in the radial migration pathways of brains older than 22 GW. Moreover, our study did not identify any significant differences in volumetric laterality in the tangential migration pathways. These results suggest that these two neuronal migration pathways develop and regress differently, and radial neuronal migration varies regionally based on hemispheric and anterior-posterior laterality, potentially explaining regional differences in

  12. Radial artery pseudoaneurysm: A rare complication after a single arterial puncture for blood-gas analysis.

    Science.gov (United States)

    Patel, Kajal Nitin; Gandhi, Shruti P; Sutariya, Harsh C

    2016-10-01

    With a reported incidence of 0.048%, radial artery pseudoaneurysm (PA) is a rare but serious complication of arterial cannulation. We report a case of PA developing after a single puncture of the right radial artery for arterial blood-gas analysis diagnosed by Doppler ultrasound in young male patient. The development of PA after puncture of radial artery for continuous blood pressure monitoring and serial blood-gas analysis has been reported in the past; however, to the best of our knowledge, there is only one case report of development of PA after a single arterial puncture for blood-gas analysis is reported in the past.

  13. Radial maze performance in three strains of mice - Role of the fimbria/fornix

    Science.gov (United States)

    Reinstein, D. K.; Deboissiere, T.; Robinson, N.; Wurtman, R. J.

    1983-01-01

    Three strains of mice were tested on an 8-arm radial maze, an index of hippocampus-dependent spatial memory. Levels of performance differed betweens strains with C57Br/cdj greater than Balb/cj greater than C57B1/6j. Lesions of the fimbria/fornix disrupted performance in the C57Br and Balb strains: the C57Bl mice never performed better than chance before or after surgery. Choline acetyltransferase activity in hippocampus was not correlated with radial maze performance. These findings suggest a possible genetic contribution towards radial maze behavior.

  14. Properties and Implications of Radial Transport in the Outer Electron Belt

    Science.gov (United States)

    Ukhorskiy, A. Y.; Sitnov, M. I.; Millan, R. M.; Kress, B. T.

    2011-12-01

    Earth's outer radiation belt extends above approximately 3.5 Re and is populated by relativistic electrons trapped in the geomagnetic field. Radiation levels across the belt can vary by multiple orders of magnitude on the time scales ranging from minutes to days. One of the basic processes leading to global variability of radiation levels in the belt is radial transport of electrons across their drift shell. The inward radial diffusion followed by "adiabatic" acceleration was the first mechanism put forward to explain creation of the outer belt. This paper reviews the results of recent analysis of basic properties of radial transport and discusses their implications to the global state of the belt. We will focus on stochastic transport which traditionally is referred to as radial diffusion. Stochastic radial transport is driven by interactions of the gradient curvature motion of the electron guiding center with ULF waves. Long-term electron motion can become stochastic due to non-linearity of electron interaction with the waves as well as to the random nature of their solar-wind driver. In spite of the underlying stochasticity the radial diffusion limit is not fully attainable in the outer radiation belt. This is attributed to the fact that phase correlations in electron motion do not have time to decay due to finite size of the system. As a result collective motion of the outer belt electrons can exhibit large deviations from radial diffusion. We will also discuss how the electron belt is affected by drift orbit bifurcations (DOBs). In a day-side compressed geomagnetic field electron orbits around Earth can exhibit bifurcations which violate their second adiabatic invariant and produce complex non-diffusive radial transport. Consequently, the third invariant is undefined for the bifurcating orbits, which means that electron motion can no not be analyzed in terms of adiabatic invariants. Even during quiet solar wind conditions DOBs affect a broad region of the belt

  15. Final analysis of the GCFR radial blanket and shield integral experiment

    Energy Technology Data Exchange (ETDEWEB)

    Ingersoll, D.T.; Williams, L.R.

    1981-04-01

    An integral experiment has been performed for verification of radiation transport methods and nuclear data used in the design of the radial shield for the proposed gas-cooled fast breeder reactor demonstration plant. The experiment was conducted at the ORNL Tower Shielding Facility and consisted of integral and spectral measurements of the neutron and gamma-ray flux transmitted through slabs of materials which modeled a GCFR-type radial blanket and radial shield. Both UO/sub 2/ and ThO/sub 2/ blankets were investigated as well as several shield designs comprising stainless steel, graphite, and boronated graphite.

  16. Qualidade de sementes de soja em função do horário de colheita e do sistema de trilha de fluxo radial e axial Soybean seeds quality in function of the harvest time and the radial or axial rotary flow track system

    Directory of Open Access Journals (Sweden)

    Maria C Marcondes

    2010-04-01

    Full Text Available O trabalho objetivou avaliar dois tipos de colhedoras, de fluxo radial e axial, em relação à qualidade física e fisiológica de sementes de duas cultivares de soja, BRS 184 e BRS 133, colhidas em dois horários, às 10 e 18 horas. A colhedora de fluxo radial trabalhou a 5,0 km h-1 , com o cilindro batedor a 750 rotações por minuto (rpm. A colhedora de fluxo axial trabalhou a 8,0 km h-1, e rotor com 650 rpm. Para a avaliação da qualidade física e fisiológica das sementes, foram realizados testes de germinação, envelhecimento acelerado, tetrazólio, dano mecânico (hipoclorito, umidade de campo e laboratório, sementes quebradas (bandinha e pureza. A colheita realizada às 18 horas, com grau de umidade menor que 12%, ocasionou maiores danos mecânicos nas sementes da cultivar BRS 184. A colhedora de sistema de fluxo axial resultou em sementes de melhor qualidade fisiológica para a cultivar BRS 184, e em menores percentuais de sementes quebradas e maior pureza para ambas as cultivares, comparativamente à colhedora de sistema de trilha com fluxo radial.This experiment aimed to evaluate two types of harvest combines, the radial flow and axial flow rotary, regarding the physical and physiological seed quality of BRS 184 and BRS 133 soybeans cultivars, harvested in two periods of the day, at 10 a.m. and 6 p.m. The conventional combine worked moving at 5.0 km h-1, cylinder speed at 750 rotations per minute (rpm. The axial rotary combine worked moving at 8.0 km h, rotorspeed at 650 rpm. The germination test, vigour test, tetrazolium, mechanical (hypochlorite damage, field and laboratory humidity test, broken seeds test and purity test were used to evaluate the physical and physiological quality of the seeds. The experiment performed at 6 pm, with a humidity level inferior to 12%, presented greater mechanical damages in BRS 184 seeds. The axial flow rotary harvest presented better seed physiological quality for BRS 184 cultivar, less

  17. Simultaneous bilateral Mason type IIb radial head fractures in a young female: Was an increased carrying angle the cause?

    LENUS (Irish Health Repository)

    2015-01-01

    Radial head fracture is the most common type of elbow fracture in adults. It results from a fall on an outstretched hand. However, simultaneous bilateral radial head fractures are extremely rare. We report a case of simultaneous bilateral mason type IIb radial head fractures in a young female, which was treated nonoperatively with excellent results

  18. The relation of sulcus nervi radialis with the fracture line of humerus fracture and radial nerve injury

    DEFF Research Database (Denmark)

    Ozden, Hilmi; Demir, Ahmet; Guven, Gul

    2008-01-01

    . Of the 34 cases which had no radial nerve injury, 16 had fracture of SNR region. CONCLUSIONS: As a result; radial nerve injury rate was 37.5% for the fractures of SNR region and it was higher compared to other studies. We concluded that the fractures of SNR region do not increase the risk of radial nerve...

  19. RAMI analysis for ITER radial X-ray camera system

    Energy Technology Data Exchange (ETDEWEB)

    Qin, Shijun, E-mail: sjqin@ipp.ac.cn [Institute of Plasma Physics, Chinese Academy of Sciences, Hefei 230031 (China); Hu, Liqun; Chen, Kaiyun [Institute of Plasma Physics, Chinese Academy of Sciences, Hefei 230031 (China); Barnsley, Robin; Sirinelli, Antoine [ITER Organization, Route Vinon sur Verdon, CS 90046, 13067, St. Paul lez Durance, Cedex (France); Song, Yuntao; Lu, Kun; Yao, Damao; Chen, Yebin; Li, Shi; Cao, Hongrui; Yu, Hong; Sheng, Xiuli [Institute of Plasma Physics, Chinese Academy of Sciences, Hefei 230031 (China)

    2016-11-15

    Highlights: • The functional analysis of the ITER RXC system was performed. • A failure modes, effects and criticality analysis of the ITER RXC system was performed. • The reliability and availability of the ITER RXC system and its main functions were calculated. • The ITER RAMI approach was applied to the ITER RXC system for technical risk control in the preliminary design phase. - Abstract: ITER is the first international experimental nuclear fusion device. In the project, the RAMI approach (reliability, availability, maintainability and inspectability) has been adopted for technical risk control to mitigate all the possible failure of components in preparation for operation and maintenance. RAMI analysis of the ITER Radial X-ray Camera diagnostic (RXC) system during preliminary design phase was required, which insures the system with a very high performance to measure the X-ray emission and research the MHD of plasma with high accuracy on the ITER machine. A functional breakdown was prepared in a bottom-up approach, resulting in the system being divided into 3 main functions, 6 intermediate functions and 28 basic functions which are described using the IDEFØ method. Reliability block diagrams (RBDs) were prepared to calculate the reliability and availability of each function under assumption of operating conditions and failure data. Initial and expected scenarios were analyzed to define risk-mitigation actions. The initial availability of RXC system was 92.93%, while after optimization the expected availability was 95.23% over 11,520 h (approx. 16 months) which corresponds to ITER typical operation cycle. A Failure Modes, Effects and Criticality Analysis (FMECA) was performed to the system initial risk. Criticality charts highlight the risks of the different failure modes with regard to the probability of their occurrence and impact on operations. There are 28 risks for the initial state, including 8 major risks. No major risk remains after taking into

  20. Proximal radial artery arteriovenous fistula for hemodialysis vascular access.

    Science.gov (United States)

    Jennings, William C; Mallios, Alexandros; Mushtaq, Nasir

    2017-09-11

    This study reviewed our experience with proximal radial artery-based arteriovenous fistulas (PRA-AVFs) for hemodialysis vascular access, evaluating characteristics of the patients, functional patency, risk of steal syndrome, survival of the patient, and technical considerations. We retrospectively analyzed our database of consecutive patients, identifying those individuals with a PRA-AVF created during a 12-year period. In addition to physical examination, all patients underwent ultrasound vessel mapping by the operating surgeon, identifying the PRA-AVF configuration and outflow target most likely to succeed. PRA-AVFs were created in 1396 individuals during the 12-year study period. The mean age was 59 years (standard deviation, ±15.9 years); 717 (51%) patients were women, 819 (59%) were diabetic, and 394 (28%) were obese. A transposition procedure was required in 400 patients, and 189 (47%) of these were completed in two-staged operations. Preoperative characteristics with a negative impact on PRA-AVF cumulative patency included female gender (hazard ratio, 1.90; 95% confidence interval, 1.37-2.65), obesity (hazard ratio, 1.92; 95% confidence interval, 1.40-2.65), and younger age. Dialysis-associated steal syndrome (DASS) requiring an intervention occurred in 39 (2.8%) patients, and 85% of these were diabetic. The most common procedures required to restore hand perfusion while preserving the AVF were banding and outflow branch ligation or coil occlusion to decrease access flow. DASS emerged spontaneously in 15 (1.1%) of the patients, and 24 (1.7%) individuals developed hand ischemia requiring intervention after fistulography with balloon angioplasty of the PRA-AVF anastomosis during the first years of the study period. Limiting angioplasty balloon size for such patients avoided these uncommon angioplasty-induced DASS events in later years. Primary, primary assisted, and cumulative (secondary) patency rates were 60%, 90%, and 93% at 12 months and 47%, 86%, and

  1. Vascularized proximal fibular epiphyseal transfer for distal radial reconstruction.

    Science.gov (United States)

    Innocenti, Marco; Delcroix, Luca; Manfrini, Marco; Ceruso, Massimo; Capanna, Rodolfo

    2005-09-01

    reconstruction, provides excellent function, and minimizes the discrepancy between the distal radial and ulnar lengths.

  2. Accelerated radial Fourier-velocity encoding using compressed sensing.

    Science.gov (United States)

    Hilbert, Fabian; Wech, Tobias; Hahn, Dietbert; Köstler, Herbert

    2014-09-01

    Phase Contrast Magnetic Resonance Imaging (MRI) is a tool for non-invasive determination of flow velocities inside blood vessels. Because Phase Contrast MRI only measures a single mean velocity per voxel, it is only applicable to vessels significantly larger than the voxel size. In contrast, Fourier Velocity Encoding measures the entire velocity distribution inside a voxel, but requires a much longer acquisition time. For accurate diagnosis of stenosis in vessels on the scale of spatial resolution, it is important to know the velocity distribution of a voxel. Our aim was to determine velocity distributions with accelerated Fourier Velocity Encoding in an acquisition time required for a conventional Phase Contrast image. We imaged the femoral artery of healthy volunteers with ECG-triggered, radial CINE acquisition. Data acquisition was accelerated by undersampling, while missing data were reconstructed by Compressed Sensing. Velocity spectra of the vessel were evaluated by high resolution Phase Contrast images and compared to spectra from fully sampled and undersampled Fourier Velocity Encoding. By means of undersampling, it was possible to reduce the scan time for Fourier Velocity Encoding to the duration required for a conventional Phase Contrast image. Acquisition time for a fully sampled data set with 12 different Velocity Encodings was 40 min. By applying a 12.6-fold retrospective undersampling, a data set was generated equal to 3:10 min acquisition time, which is similar to a conventional Phase Contrast measurement. Velocity spectra from fully sampled and undersampled Fourier Velocity Encoded images are in good agreement and show the same maximum velocities as compared to velocity maps from Phase Contrast measurements. Compressed Sensing proved to reliably reconstruct Fourier Velocity Encoded data. Our results indicate that Fourier Velocity Encoding allows an accurate determination of the velocity distribution in vessels in the order of the voxel size. Thus

  3. The impact of rational surfaces on radial heat transport in TJ-II

    Science.gov (United States)

    van Milligen, B. Ph.; Nicolau, J. H.; García, L.; Carreras, B. A.; Hidalgo, C.; the TJ-II Team

    2017-05-01

    In this work, we study the outward propagation of temperature perturbations. For this purpose, we apply an advanced analysis technique, transfer entropy, to ECE measurements performed in ECR heated discharges at the low-shear stellarator TJ-II. We observe that the propagation of these perturbations is not smooth, but is slowed down at specific radial positions, near ‘trapping zones’ characterized by long time lags with respect to the perturbation origin. We also detect instances of rapid or instantaneous (non-local) propagation, in which perturbations appear to ‘jump over’ specific radial regions. The analysis of perturbations introduced in a resistive magneto-hydrodynamic model of the plasma leads to similar results. The radial regions corresponding to slow radial transport are identified with maxima of the flow shear associated with rational surfaces (mini-transport barriers). The non-local interactions are ascribed to MHD mode coupling effects.

  4. Radial patterns of tree-ring chemical element concentration in two Appalachian hardwood stands

    Science.gov (United States)

    D.R. Dewalle; B.R. Swistock; W.E. Sharpe

    1991-01-01

    Radial patterns in tree-ring chemical element concentration in red oak (Quercus rubra L.) and black (Prunus serotina Ehrh.) were analyzed to infer past environmental changes at two mature Appalachian forest sites.

  5. Fluctuating Pressure Environments and Hydrodynamic Radial Force Mitigation for a Two Blade Unshrouded Inducer

    Science.gov (United States)

    Mulder, Andrew; Skelley, Stephen

    2011-01-01

    Fluctuating pressure data from water flow testing of an unshrouded two blade inducer revealed a cavitation induced oscillation with the potential to induce a radial load on the turbopump shaft in addition to other more traditionally analyzed radial loads. Subsequent water flow testing of the inducer with a rotating force measurement system confirmed that the cavitation induced oscillation did impart a radial load to the inducer. After quantifying the load in a baseline configuration, two inducer shroud treatments were selected and tested to reduce the cavitation induced load. The first treatment was to increase the tip clearance, and the second was to introduce a circumferential groove near the inducer leading edge. Increasing the clearance resulted in a small decrease in radial load along with some steady performance degradation. The groove greatly reduced the hydrodynamic load with little to no steady performance loss. The groove did however generate some new, relatively high frequency, spatially complex oscillations to the flow environment.

  6. Radial super-resolution in digital holographic microscopy using structured illumination with circular symmetry

    Science.gov (United States)

    Yin, Yujian; Su, Ping; Ma, Jianshe

    2018-01-01

    A method to improve the radial resolution using special structured light is proposed in the field of digital holographic microscopy (DHM). A specimen is illuminated with circular symmetrical structured light that makes the spectrum have radial movement, so that high frequency components of the specimen are moved into the passband of the receiver to overcome the diffraction limit. In the DHM imaging system, Computer Generated Hologram (CGH) technology is used to generate the required structured light grating. Then the grating is loaded into a spatial light modulator (SLM) to obtain specific structured illumination. After recording the hologram, digital reconstruction, for the microstructure of a binary optical element that needs to observe radial distribution, the radial resolution of the specimen is improved experimentally compare it with the result of one-dimensional sinusoidal structured light imaging. And a method of designing structured light is presented.

  7. Ultra-directional super-scattering of homogenous spherical particles with radial anisotropy

    CERN Document Server

    Liu, Wei

    2015-01-01

    We study the light scattering of homogenous radially-anisotropic spherical particles. It is shown that radial anisotropy can be employed to tune effectively the electric resonances, and thus enable flexible overlapping of electric and magnetic dipoles of various numbers, which leads to unidirectional forward super-scattering at different spectral positions. We further reveal that through adjusting the radial anisotropy parameters, electric and magnetic resonances of higher orders can be also made overlapped, thus further collimating the forward scattering lobes. The ultra-directional super-scattering we have obtained with individual homogenous radially anisotropic spherical particles may shed new light to the design of compact and efficient nanoantennas, which may find various applications in solar cells, bio-sensing and many other antenna based researches.

  8. A radial-velocity study of 18 emission-line B stars

    Science.gov (United States)

    Jarad, M. M.; Hilditch, R. W.; Skillen, Ian

    1989-06-01

    A total of 647 radial velocities of 18 northern-hemisphere Be stars obtained over two observing seasons (1983-1985) are presented. These velocities have been determined by the cross-correlation technique applied to selected spectral regions avoiding the hydrogen lines and including the He I lines. Analyses of these data via Fourier techniques suggest that three new spectroscopic binaries are discovered and that seven stars show variability in radial velocity which may be attributable to radial or nonradial pulsation. Four known binary orbits are confirmed. Only four stars in the sample are found to have constant radial velocity. These results strengthen and extend the evidence that the Be phenomenon can result from pulsational instability and that the proportion of binary systems among Be stars is about the same as the normal stellar population. Very-high-resolution spectroscopy of those stars found to be variable in velocity should reveal changes in line-profile shape due to nonradial pulsation.

  9. VizieR Online Data Catalog: YZ Ceti radial velocity curve (Astudillo-Defru+, 2017)

    Science.gov (United States)

    Astudillo-Defru, N.; Diaz, R. F.; Bonfils, X.; Almenara, J. M.; Delisle, J.-B.; Bouchy, F.; Delfosse, X.; Forveille, T.; Lovis, C.; Mayor, M.; Murgas, F.; Pepe, F.; Santos, N. C.; Segransan, D.; Udry, S.; Wunsche, A.

    2017-08-01

    We acquired spectra with HARPS, a stabilized high-resolution spectrograph specifically designed to compute precise radial velocities. It is an ESO instrument installed at La Silla observatory. (1 data file).

  10. Experimental Feasibility Study of Estimation of the Normalized Central Blood Pressure Waveform from Radial Photoplethysmogram

    Directory of Open Access Journals (Sweden)

    Edmond Zahedi

    2015-01-01

    Full Text Available The feasibility of a novel system to reliably estimate the normalized central blood pressure (CBPN from the radial photoplethysmogram (PPG is investigated. Right-wrist radial blood pressure and left-wrist PPG were simultaneously recorded in five different days. An industry-standard applanation tonometer was employed for recording radial blood pressure. The CBP waveform was amplitude-normalized to determine CBPN. A total of fifteen second-order autoregressive models with exogenous input were investigated using system identification techniques. Among these 15 models, the model producing the lowest coefficient of variation (CV of the fitness during the five days was selected as the reference model. Results show that the proposed model is able to faithfully reproduce CBPN (mean fitness = 85.2% ± 2.5% from the radial PPG for all 15 segments during the five recording days. The low CV value of 3.35% suggests a stable model valid for different recording days.

  11. OUTER-DISK POPULATIONS IN NGC 7793: EVIDENCE FOR STELLAR RADIAL MIGRATION

    Energy Technology Data Exchange (ETDEWEB)

    Radburn-Smith, David J.; Dalcanton, Julianne J. [Department of Astronomy, University of Washington, Seattle, WA 98195 (United States); Roskar, Rok [Institut fuer Theoretische Physik, Universitaet Zuerich (Switzerland); Debattista, Victor P. [Jeremiah Horrocks Institute, University of Central Lancashire, Preston PR1 2HE (United Kingdom); Streich, David; De Jong, Roelof S.; Vlajic, Marija [Leibniz-Institut fuer Astrophysik Potsdam, D-14482 Potsdam (Germany); Holwerda, Benne W. [European Space Agency, ESTEC, 2200 AG Noordwijk (Netherlands); Purcell, Chris W. [Department of Physics and Astronomy, University of Pittsburgh, Pittsburgh, PA 15260 (United States); Dolphin, Andrew E. [Raytheon, 1151 E. Hermans Road, Tucson, AZ 85756 (United States); Zucker, Daniel B. [Department of Physics and Astronomy, Macquarie University, NSW 2109 (Australia)

    2012-07-10

    We analyzed the radial surface brightness profile of the spiral galaxy NGC 7793 using HST/ACS images from the GHOSTS survey and a new HST/WFC3 image across the disk break. We used the photometry of resolved stars to select distinct populations covering a wide range of stellar ages. We found breaks in the radial profiles of all stellar populations at 280'' ({approx}5.1 kpc). Beyond this disk break, the profiles become steeper for younger populations. This same trend is seen in numerical simulations where the outer disk is formed almost entirely by radial migration. We also found that the older stars of NGC 7793 extend significantly farther than the underlying H I disk. They are thus unlikely to have formed entirely at their current radii, unless the gas disk was substantially larger in the past. These observations thus provide evidence for substantial stellar radial migration in late-type disks.

  12. Existence of positive radial solutions for a weakly coupled system via blow up

    Directory of Open Access Journals (Sweden)

    Marta García-Huidobro

    1998-01-01

    Full Text Available The existence of positive solutions to certain systems of ordinary differential equations is studied. Particular forms of these systems are satisfied by radial solutions of associated partial differential equations.

  13. Release of relaxin-like gonad-stimulating substance from starfish radial nerves by lonomycin.

    Science.gov (United States)

    Mita, Masatoshi

    2013-07-01

    In starfish, the peptide hormone gonad-stimulating substance (GSS) secreted from nervous tissue stimulates oocyte maturation to induce 1-methyladenine (1-MeAde) production by ovarian follicle cells. Recently, GSS was purified from radial nerves of the starfish Asterina pectinifera and identified as a relaxin-like peptide. This study examines the mechanism of GSS secretion from radial nerves. When radial nerves isolated from A. pectinifera were incubated in artificial seawater containing ionomycin as a calcium ionophore, GSS release increased in a dose-dependent manner; 50% activity of GSS release was obtained with approximately 10 µM ionomycin. Another calcium ionophore, A23187, also stimulated GSS release from radial nerves. In contrast, membrane permeable cyclic AMP and cyclic GMP analogs failed to induce GSS release. These results suggest that GSS secretion is induced by intracellular Ca(2+) as a second messenger.

  14. Modified radial v/s biatrial maze for atrial fibrillation in rheumatic valvular heart surgery

    Directory of Open Access Journals (Sweden)

    Sajid A. Sayed

    2014-09-01

    Discussion: In patients with AF undergoing rheumatic valvular surgery, radiofrequency radial approach is as effective as modified Cox's maze III for conversion to NSR with better atrial transport function.

  15. Fracture mapping of displaced partial articular fractures of the radial head

    NARCIS (Netherlands)

    Mellema, Jos J.; Eygendaal, Denise; van Dijk, C. Niek; Ring, David; Doornberg, Job N.

    2016-01-01

    Recognition of patterns of traumatic elbow instability helps anticipate specific fracture characteristics and associated injuries. The objective of this study was to assess the association of fracture line distribution and location of displaced partial articular radial head fractures with specific

  16. Impurity profiles and radial transport in the EXTRAP-T2 reversed field pinch

    Science.gov (United States)

    Sallander, J.

    1999-05-01

    Radially resolved spectroscopy has been used to measure the radial distribution of impurity ions (O III-O V and C III-CVI) in the EXTRAP-T2 reversed field pinch (RFP). The radial profile of the emission is reconstructed from line emission measured along five lines of sight. The ion density profile is the fitted quantity in the reconstruction of the brightness profile and is thus obtained directly in this process. These measurements are then used to adjust the parameters in transport calculations in order to obtain consistency with the observed ion density profiles. Comparison between model and measurements show that a radial dependence in the diffusion is needed to explain the measured ion densities.

  17. Free vibrations and buckling analysis of laminated plates by oscillatory radial basis functions

    Science.gov (United States)

    Neves, A. M. A.; Ferreira, A. J. M.

    2015-12-01

    In this paper the free vibrations and buckling analysis of laminated plates is performed using a global meshless method. A refined version of Kant's theorie which accounts for transverse normal stress and through-the-thickness deformation is used. The innovation is the use of oscillatory radial basis functions. Numerical examples are performed and results are presented and compared to available references. Such functions proved to be an alternative to the tradicional nonoscillatory radial basis functions.

  18. Rice body formation in bicipito-radial bursitis: ultrasound, CT, and MRI findings

    Energy Technology Data Exchange (ETDEWEB)

    Spence, L.D.; Adams, J.; Eustace, S. [Department of Radiology, Boston Medical Center, One Boston Medical Center Place, Boston MA 02118 (United States); Gibbons, D. [Department of Pathology, Boston Medical Center, Boston, Massachusetts (United States); Mason, M.D. [Department of Orthopedics, Boston Medical Center, Boston, Massachusetts (United States)

    1998-01-01

    The bicipito-radial bursa, which lies at the biceps tendon insertion on the radial tuberosity, is a rare site of chronic bursitis. We describe the clinical, radiological, and pathological findings in a case complicated by multiple rice body formation. In so doing, we describe MR appearances that allow discrimination of this entity from both synovial chondromatosis and pigmented villonodular synovitis. (orig.) With 3 figs., 8 refs.

  19. Numerical simulation of radial compressor stages with seals and technological holes

    Directory of Open Access Journals (Sweden)

    Syka Tomáš

    2014-03-01

    Full Text Available Article describes numerical simulations of an air flow in radial compressor stages in the NUMECA CFD software. Four different radial compressor stages were solved in this article. During the tasks evaluating the stepped and straight impeller seals and technological holes influence on working characteristics and the flow field was observed. Also the CFD results comparison with results from the empiric design tool is described.

  20. Radial glial cells defined and major intermediates between embryonic stem cells and CNS neurons.

    Science.gov (United States)

    Götz, Magdalena; Barde, Yves-Alain

    2005-05-05

    Radial glial cells have been identified as a major source of neurons during development. Here, we review the evidence for the distinct "glial" nature of radial glial cells and contrast these cells with their progenitors, the neuroepithelial cells. Recent results also suggest that not only during neurogenesis in vivo, but also during the differentiation of cultured embryonic stem cells toward neurons, progenitors with clear glial antigenic characteristics act as cellular intermediates.

  1. Experimental and numerical study of radial flow and its contribution to wake development of a HAWT

    OpenAIRE

    Micallef, Daniel; Akay, Busra; Sant, Tonio; Ferreira, Carlos Simao; Bussel, Van Gerard; ; European Wind Energy Conference and Exhibition 2011

    2011-01-01

    The scope of this work was to investigate radial flow component for a Horizontal Axis Wind Turbine in ax- ial flow conditions and to assess its impact on the turbine operation. This was done by means of Parti- cle Image Velocimetry and numerical simulation with a 3D unsteady potential-flow panel model. A direct comparison between the numerical and experimen- tal radial velocity results show differences in the tip and root regions. These differences have important ...

  2. Experimental and numerical study of radial flow and its contribution to wake development of a HAWT

    OpenAIRE

    Micallef, D.; Akay, B.; Sant, van 't, L.E.; Simao Ferreira, C.J.; Van Bussel, G.J.W.

    2011-01-01

    The scope of this work was to investigate radial flow component for a Horizontal Axis Wind Turbine in axial flow conditions and to assess its impact on the turbine operation. This was done by means of Particle Image Velocimetry and numerical simulation with a 3D unsteady potential-flow panel model. A direct comparison between the numerical and experimental radial velocity results show differences in the tip and root regions. These differences have important implications on the wake developmen...

  3. A catalog of rotational and radial velocities for evolved stars. V. Southern stars

    OpenAIRE

    {De Medeiros} J.~R.; {Alves} S.; {Udry} S.; {Andersen} J.; {Nordström}} B.; {Mayor} M.

    2014-01-01

    Rotational and radial velocities have been measured for 1589 evolved stars of spectral types F, G and K and luminosity classes IV, III, II and Ib, based on observations carried out with the CORAVEL spectrometers. The precision in radial velocity is better than 0.30 km/s per observation, whereas rotational velocity uncertainties are typically 1.0 km/s for subgiants and giants and 2.0 km/s for class II giants and Ib supergiants.

  4. PAINLESS RADIAL ACCESS PROCEDURES WITH NICORANDIL: A COMPARATIVE ASSESSMENT WITH CONVENTIONAL VERAPAMIL - NITROGLYCERINE COCKTAIL

    OpenAIRE

    Jain T Kallarakkal; Rajesh T

    2012-01-01

    Background: Radial artery spasm is a major limitation of the transradial approach. This study was designed to compare the spasmolytic effect between nicorandil and the conventional cocktail of nitroglycerine and verapamil during transradial coronary procedures. Materials and methods: 200 patients were randomized into two groups to compare 8 mg of nicorandil and cocktail (mixture of normal saline, 5 mg of verapamil and 200 μg of nitroglycerin). Radial artery spasm and patient comfort in both t...

  5. Efek Pengintegrasian Pembangkit Listrik Tersebar pada Jaringan Distribusi Radial terhadap Perosotan Tegangan

    OpenAIRE

    Eka Fitrianto; Refdinal Nazir

    2016-01-01

    At 20 kV radial distribution systems supplied by the substation in a considerable distance from the load centre, will cause occurred its voltage drop significantly. The integration of distributed generation on the distribution networks will be one of the solutions to reduce the drop voltage. This paper proposes a way to analyze the effect of integration multiple distributed generation (DG) in radial distribution networks to the voltage drop. This analysis uses the injection current method o...

  6. Efek Pengintegrasian Pembangkit Listrik Tersebar Pada Jaringan Distribusi Radial Terhadap Perosotan Tegangan

    OpenAIRE

    Fitrianto, Eka; Nazir, Refdinal

    2016-01-01

    Electrical systems supplied from a substation (GI) which is quite far away from the center of the furthest load will cause a voltage drop in radial distribution network. Integration of distributed generation (Distributed Generation, DG) on the distribution network will be one of the solutions to improve the voltage drop. This paper analyzes integrating several distributed generation (DG) in a radial distribution network to repair a voltage with Matlab program. Method using flow injection anal...

  7. Models of disk chemical evolution focusing the pure dynamical radial mixing

    Directory of Open Access Journals (Sweden)

    Re Fiorentin P.

    2012-02-01

    Full Text Available We performed N-body simulations to study the dynamical evolution of a stellar disk inside a Dark Matter (DM halo. Our results evidence how a standard -radially decreasing- metallicity gradient produces a negative vϕ vs. [Fe/H] correlation, similar to that shown by the thin disk stars, while an inverse radial gradient generates a positive rotation-metallicity correlation, as that observed in the old thick population.

  8. Experimental observation of the aberration effects on a radially polarized beam.

    Science.gov (United States)

    Gaffar, Mohammad; Kalita, Ranjan; Boruah, Bosanta R

    2016-11-01

    In the last couple of decades the radially polarized beam has been gaining a lot of importance in diverse areas owing to its unique properties, especially near the focus of a lens. For instance, when focused tightly, the radially polarized beam produces a strong axially polarized field on the optical axis near the focus. Some of the areas where the radially polarized beam is found to be useful are optical trapping, laser machining, optical data storage, optical superresolution, and so on. Considering the fact that there is not any optical system that can be treated as perfectly aberration free, the applications of the radially polarized beam can, in practice, more or less be affected by the presence of aberrations. Indeed, there have been studies to understand the properties of the radially polarized beam in the presence of various aberrations. However, most such studies have been purely theoretical without being complimented by experimental results. In this paper, we present a comprehensive experimental investigation on the effect of aberrations on a focused radially polarized beam. The accuracy of our experimental results is confirmed by comparing them with the equivalent numerical simulation results.

  9. Radial nerve injury following elbow external fixator: report of three cases and literature review.

    Science.gov (United States)

    Trigo, Luis; Sarasquete, Juan; Noguera, Laura; Proubasta, Ignacio; Lamas, Claudia

    2017-07-01

    Radial nerve palsy is a rare but serious complication following elbow external fixation. Only 11 cases have been reported in the literature to date, but the incidence may be underreported. We present three new cases of this complication. We analyzed the three cases of radial palsy seen in our center following the application of an external fixator as treatment for complex elbow injuries. Mean patient age at surgery was 50 years. Two patients were female and one was male. In the three cases, the initial lesion was a posterior elbow dislocation, associated with a fracture of the radial shaft in one and a radial head fracture and coronoid fracture, respectively, in the other two. Due to persistent elbow instability, an external fixator was applied in all three cases. The fixator pins were introduced percutaneously in two cases and under direct vision in an open manner in the third case. Radial palsy was noted immediately postoperatively in all cases. It was permanent in two cases and temporary in the third. Radial nerve palsy after placement of an external elbow fixator was resolved in only 1 of our 3 cases and in 6 of the 11 cases in the literature to date. Although the event is rare, these alarming results highlight the need for recommendations to avoid this complication.

  10. Tuning porosity and radial mechanical properties of DNA origami nanotubes via crossover design

    Science.gov (United States)

    Ma, Zhipeng; Kawai, Kentaro; Hirai, Yoshikazu; Tsuchiya, Toshiyuki; Tabata, Osamu

    2017-06-01

    DNA origami nanotubes are utilized as structural platforms for the fabrication of various micro/nanosystems for drug delivery, optical or biological sensing, and even nanoscale robots. Their radial structural and mechanical properties, which play a crucial role in the effective use of micro/nanosystems, have not been fully studied. In particular, the effects of crossovers, which are basic structures for rationally assembling double-stranded DNA (dsDNA) helices into a nanotube configuration, have not yet been characterized experimentally. To investigate the effects of crossovers on the porosity and the radial mechanical properties of DNA origami nanotubes, we fabricated a DNA origami nanotube with varied crossover designs along the nanotube axis. The radial geometry of the DNA origami nanotube is experimentally characterized by both atomic force microscopy (AFM) and electron cryomicroscopy (cryo-EM). Moreover, the radial mechanical properties of the DNA origami nanotube including the radial modulus are directly measured by force-distance-based AFM. These measurements reveal that the porosity and the radial modulus of DNA origami nanotubes can be tuned by adjusting the crossover design, which enables the optimal design and construction of DNA origami nanostructures for various applications.

  11. Radial differential interior tomography and its image reconstruction with differentiated backprojection and projection onto convex sets.

    Science.gov (United States)

    Tang, Shaojie; Tang, Xiangyang

    2013-09-01

    Interior tomography has been recognized as one of the most effective approaches in computed tomography (CT) to reduce radiation dose rendered to patients. In this work, the authors propose and evaluate an imaging method of radial differential interior tomography. In interior tomography, an x-ray beam is collimated to only irradiate the region of interest (ROI) with suspected lesions while the surrounding area∕volume of normal tissues∕organs is spared. In the proposed imaging method of radial differential interior tomography, the outcome is a ROI image that has gone through a radial differential filtering. The image reconstruction algorithm for the radial differential interior tomography is kept in the fashion of differentiated backprojection and projection onto convex sets, but the required a priori knowledge in a small round area becomes zero and may be more readily available in practice. Using the projection data simulated by computer and acquired by CT scanner, the authors evaluate and verify the performance of the proposed radial differential interior tomography method and its associated image reconstruction algorithm. The preliminary results show that the proposed imaging method can generate an image that is the radial differentiation of a conventional tomographic image and is robust over noise that inevitably exist in practice. It is believed that the proposed imaging method may find its utility in advanced clinical applications wherein a ROI-based image processing and analysis is required for lesion visualization, characterization, and diagnosis.

  12. The effect of radial head fracture size on radiocapitellar joint stability.

    Science.gov (United States)

    Beingessner, Daphne M; Dunning, Cynthia E; Beingessner, Clare J; Johnson, James A; King, Graham J W

    2003-08-01

    The purpose of this study was to determine the effect of radial head fracture size on radiocapitellar stability. Repeated measures using Instron materials testing machine. Radial head fractures are common injuries and controversy exists as to the optimal management of displaced wedge fractures. Fractures were simulated in six fresh-frozen cadaveric radiocapitellar joints by removing sequential 20 degree wedges from the anterolateral aspect of each radial head until 140 degrees of the radial head was removed. Decreased shear load at the radial head during joint loading was used as an indicator of decreased stability at the radiocapitellar joint. Using a custom designed jig and employing a compressive joint load of 100 N, the maximum shear load at the radiocapitellar joint was measured at 30, 60, 90 and 120 degrees of elbow flexion. There was no difference in the shear load between the intact specimen and that with a 20 degree wedge removed at all flexion angles (P>0.05). Shear load decreased with each increase in wedge size between 20 and 120 degrees (Pfracture size. Small radial head fracture fragments are biomechanically significant. Therefore, the use of an arbitrary fragment size as an indication for surgery should be reconsidered, particularly if there is an associated ligamentous injury.

  13. Inside-Out Radial Migration Facilitates Lineage-Dependent Neocortical Microcircuit Assembly.

    Science.gov (United States)

    He, Shuijin; Li, Zhizhong; Ge, Shaoyu; Yu, Yong-Chun; Shi, Song-Hai

    2015-06-03

    Neocortical excitatory neurons migrate radially along the glial fibers of mother radial glial progenitors (RGPs) in a birth-date-dependent inside-out manner. However, the precise functional significance of this well-established orderly neuronal migration remains largely unclear. Here, we show that strong electrical synapses selectively form between RGPs and their newborn progeny and between sister excitatory neurons in ontogenetic radial clones at the embryonic stage. Interestingly, the preferential electrical coupling between sister excitatory neurons, but not that between RGP and newborn progeny, is eliminated in mice lacking REELIN or upon clonal depletion of DISABLED-1, which compromises the inside-out radial neuronal migration pattern in the developing neocortex. Moreover, increased levels of Ephrin-A ligand or receptor that laterally disperse sister excitatory neurons also disrupt preferential electrical coupling between radially aligned sister excitatory neurons. These results suggest that RGP-guided inside-out radial neuronal migration facilitates the initial assembly of lineage-dependent precise columnar microcircuits in the neocortex. Copyright © 2015 Elsevier Inc. All rights reserved.

  14. Radial glial cells play a key role in echinoderm neural regeneration

    Science.gov (United States)

    2013-01-01

    Background Unlike the mammalian central nervous system (CNS), the CNS of echinoderms is capable of fast and efficient regeneration following injury and constitutes one of the most promising model systems that can provide important insights into evolution of the cellular and molecular events involved in neural repair in deuterostomes. So far, the cellular mechanisms of neural regeneration in echinoderm remained obscure. In this study we show that radial glial cells are the main source of new cells in the regenerating radial nerve cord in these animals. Results We demonstrate that radial glial cells of the sea cucumber Holothuria glaberrima react to injury by dedifferentiation. Both glia and neurons undergo programmed cell death in the lesioned CNS, but it is the dedifferentiated glial subpopulation in the vicinity of the injury that accounts for the vast majority of cell divisions. Glial outgrowth leads to formation of a tubular scaffold at the growing tip, which is later populated by neural elements. Most importantly, radial glial cells themselves give rise to new neurons. At least some of the newly produced neurons survive for more than 4 months and express neuronal markers typical of the mature echinoderm CNS. Conclusions A hypothesis is formulated that CNS regeneration via activation of radial glial cells may represent a common capacity of the Deuterostomia, which is not invoked spontaneously in higher vertebrates, whose adult CNS does not retain radial glial cells. Potential implications for biomedical research aimed at finding the cure for human CNS injuries are discussed. PMID:23597108

  15. Griffonia simplicifolia II lectin labels a population of radial glial cells in the embryonic rat brain.

    Science.gov (United States)

    Hurley, S D; Streit, W J

    1995-01-01

    Staining with the Griffonia simplicifolia II lectin (GSL II), a marker for adult rat oligodendrocytes, was studied in rat brain at embryonic (E) days E14, E16, E18, and E20. At E14, only two regions of the CNS showed labeling--the hippocampal primordium and the ventromedial floor of the mesencephalic aqueduct and fourth ventricle. Labeling in these areas was confined to cells with bipolar processes which spanned from the ventricular lumen to the pial surface. At E16, GSL II+ radial glia were present in the hippocampus, septal area, cerebral peduncle, thalamus, tegmentum, and throughout much of the midbrain. At E16, E18, and E20, GSL II strongly labeled two midline radial glial raphes--dorsal to the mesencephalic aqueduct and ventral to the mesencephalic aqueduct and fourth ventricle. Comparison of GSL II lectin labeling with nestin immunostaining, using Rat-401, showed that GSL II labeled a distinct population of radial cells different from nestin-positive radial glia. GSL II also labeled a group of neurons at E16 and E18 in the hypothalamus and basal striatum. We suggest that GSL II+ radial glia represent a population of oligodendroglial precursors present in the embryonic brain, and that GSL II reactivity could serve as a differentiation marker for cells committed to the oligodendroglial lineage. This work supports the possibility that some oligodendroglia, like astrocytes, are derived from radial glial precursors.

  16. Combined influence of the impurities and radial electric field on dielectric barrier discharges in atmospheric helium

    Science.gov (United States)

    Huang, Zhiming; Hao, Yanpeng; Han, Yuying; Yang, Lin; Tang, Li; Liao, Yifan; Li, Licheng

    2017-11-01

    The combined influence of nitrogen impurities and radial electric field on dielectric barrier discharges in atmospheric helium is investigated using a two-dimensional (2D) fluid simulation. Discharge current waveforms, 2D electron densities, distributions of surface charge, and radial and axial components of the electric field at the electrode edge are calculated for different impurity levels varying from 0 to 30 ppm. It is observed that the discharge presents the characteristic of a column in pure helium, and it gradually becomes a relatively uniform glow discharge as the impurity level is increased to 20 ppm; for the higher impurity level of 30 ppm, the discharge adopts a concentric-ring pattern discharge. Our result shows that the radial electric field at the electrode edge is approximately 0.6-1.2 kV/cm during the discharge. This radial electric field has an effect that leads to a non-uniform discharge. After doping a low level of impurities, the Penning ionizations caused by the impurities can inhibit this effect and lead to a uniform discharge. However, for a higher impurity level (30 ppm), the effect of the radial electric field again becomes dominant, which easily leads to a non-uniform discharge. These results provide a new perspective on obtaining a uniform glow discharge when both influences of the impurity and radial electric field are taken into account.

  17. Cyclic impulsive compression loading along the radial and tangential wood directions causes localized fatigue

    Science.gov (United States)

    Salmi, Ari; Montonen, Risto; Salminen, Lauri I.; Suuronen, Jussi-Petteri; Serimaa, Ritva; Hæggström, Edward

    2012-12-01

    We report for the first time on the existence of a localized reduction in elasticity caused by repeated compression impaction applied along the tangential wood direction. Previous research indicates that localized strain profiles are generated by such cyclic impacting on wood along its radial direction. This finding is significant for the paper/board-making industry where wood is exposed to cyclic unipolar compression during grinding. However, the effect of the impacting direction, with respect to the orientation of the annual rings, on the localization phenomenon is unknown. In addition, the shape of the developing fatigue layer is unclear. We revisit the localization phenomenon with a focus on tangential impacting. We employed ultrasonics and x-ray tomography to quantify the induced fatigue. An interlacing technique increased the precision of the ultrasonic stiffness depth profiling technique. We studied both radial and tangential wood annual ring geometries. We used ultrasound to quantify the drop in shear modulus resulting from impacting. Both radial and tangential geometries featured strain localization, but the shape of the fatigued layer was different in the radial and tangential wood geometries (steeper profile in the radial geometry). The fatiguing reduced the shear modulus. These results tell us about the ratio of the number of hits that need to be delivered along the radial and tangential direction of the ground wood, respectively. This insight may translate into a design pattern for an energy saving grind stone surface.

  18. The Effect of Position and Different Size of Radial Hole on Performance of Cannulated Pedicle Screw

    Directory of Open Access Journals (Sweden)

    Zakaria F. A.

    2017-01-01

    Full Text Available Cannulated Pedicle Screw (CPS is the instrumentation that has been introduced in Biomedical field in order to stabilize the spine structure and also to enhance the pullout strength in osteoporotic patient. The cement is injected through the CPS which is flow from the screw head to the radial hole and then distributed around the CPS to give higher performance of pullout strength. However, the fracture still reported to happened around the radial hole. This paper is aim to focus on the effect of the position and different diameter of radial hole on the CPS. Three designs were constructed using SolidWork software where two of it are the current models whereas the third was the proposed design which the radial holes were position differently (skewed to each other and its size is smaller than the current model, 1.0 mm and 1.5mm respectively. The software used for Finite Element Analysis (FEA is Ansys workbench 16.0. The Finite Element Models were verified with FEA result of the previous research. The FEA results of torsional stress for current and proposed design were then compared to obtain the maximum torque that both designs are able to resist before fracture. It can be concluded that the performance of CPS can be improved by the proposed design which is 2 radial hole skewed to each other and smaller radial hole diameter (1.0mm than the current cannulated pedicle screw (1.5mm.

  19. Fatores associados ao aumento no índice de incremento de pressão radial em indivíduos hipertensos Factors associated with increased radial augmentation index in hypertensive individuals

    Directory of Open Access Journals (Sweden)

    Renan Oliveira Vaz-de-Melo

    2011-09-01

    Full Text Available FUNDAMENTO: A rigidez arterial é uma variável preditora de morbimortalidade e um possível marcador de lesão vascular. Sua avaliação não invasiva por tonometria radial e análise do índice de incremento (r-AI permite identificar os pacientes expostos a um maior risco cardiovascular. OBJETIVO: Analisar a influência do r-AI em variáveis clínico-bioquímicas e sua influência na prevalência de dano em órgão-alvo em pacientes hipertensos. MÉTODOS: Cento e quarenta pacientes hipertensos consecutivos, em seguimento clínico ambulatorial, foram submetidos à análise transversal. Os níveis de pressão arterial (PA e o r-AI foram obtidos por tonometria de aplanação da artéria radial (HEM-9000AI, Onrom. Os pacientes foram alocados em tercis r-AI (r-AI 97%. RESULTADOS: A amostra era predominantemente composta por mulheres (56,4%, com idade média de 61,7 ± 11,7 anos e índice de massa corporal de 29,6 ± 6,1 Kg/m². O maior tercil apresentou uma proporção maior de mulheres (p = 0,001, maior PA sistólica (p = 0,001 e pressão de pulso (p = 0,014, e menor peso (p = 0,044, altura (p BACKGROUND: Arterial stiffness is a variable predictor of morbidity and mortality and a possible marker of vascular injury. Its non-invasive assessment by radial tonometry and analysis of the augmentation index (r-AI allows identifying patients exposed to higher cardiovascular risk. OBJECTIVE: To analyze the influence of r-AI on clinical-biochemical variables and its influence on the prevalence of target-organ damage in hypertensive patients. METHODS: 140 consecutive hypertensive patients, followed-up in an outpatient clinic, were analyzed in a cross-sectional study. Blood pressure (BP levels and r-AI were obtained by applanation tonometry of the radial artery (HEM-9000AI, Onrom. The patients were allocated into r-AI tertiles (r-AI 97%. RESULTS: The sample was predominantly composed of women (56.4%, mean age of 61.7 ± 11.7 years and body mass index 29.6

  20. ESTUDIO ANATÓMICO DE LA RAMA SUPERFICIAL DEL NERVIO RADIAL. IMPLICACIONES QUIRÚRGICAS Superficial branch of radial nerve: an anatomical study and its surgical implications

    National Research Council Canada - National Science Library

    Enrique Vergara-Amador; José Luis Nieto

    2010-01-01

    ... emergió en la región dorsal y radial del tercio distal del antebrazo entre el músculo braquiradialis y el extensor carpis radialis longus, a una distancia de 8,45 cm proximal a la apófisis estiloides...

  1. Elective vs non-elective radial artery grafts: comparing midterm results through 64-Slice computed tomography Enxertos de artéria radial eletivos vs emergência: comparando resultados em seguimento a médio prazo

    Directory of Open Access Journals (Sweden)

    Roberto Rocha-e-Silva

    2007-01-01

    Full Text Available BACKGROUND: Left internal thoracic artery to left anterior descending artery (LITA-LADA grafting has become a fundamental part of the coronary artery bypass graft procedure (CABG. This grafting in turn has led to an increased use of other arterial conduits, of which the radial artery (RA is most popular. Whether RA grafting can be used in the emergency patient is controversial. METHODS: 47 patients with critical stenosis (>70% in all target vessels underwent CABG with LITA and RA grafts from 1996 to 2003. Patients were divided into elective (23 patients and non-elective groups (24 patients with LITA and RA grafts per patient being similar in both groups. Of these 47 patients, 5 died from non-cardiac complications and 12 were unavailable. Thus, 30 patients (71% of survivors were studied by multidetector computed tomography. A total of 36 LITA and 64 RA grafts were studied. RESULTS: The RA patency rate for elective and non-elective grafts were 82% (31/38 and 85% (22/26, respectively (p=0.75. The RA had a similar patency rate for all target vessels ranging from 73% to 100%. Only one patient had a redo CABG and 29 (97% are free from angina or re-intervention. LITA-LADA had a 92% (11/12 and 100% (10/10 patency rate for elective and non-elective groups, respectively (p=0.37. The sequential LITA-diagonal-LADA in the elective group had a 50% (03/06 patency rate, which was significantly lower than the 100% (08/08 patency rate of the non-elective group (p=0.02. CONCLUSION: Radial Artery grafts can be used in both elective and non-elective patients with excellent results.INTRODUÇÃO: A anastomose da artéria torácica interna esquerda com a artéria descendente anterior (ATIE-DA se tornou parte fundamental da cirurgia de revascularização do miocárdio (RM. Esta técnica levou ao aumento de utilização de outros enxertos arteriais, entre os quais, a artéria radial (AR é muito usasa. Na literatura há controvérsia se a AR pode ser usada em pacientes

  2. Radial Clearance Found To Play a Key Role in the Performance of Compliant Foil Air Bearings

    Science.gov (United States)

    Radil, Kevin C.

    2003-01-01

    Compliant foil air bearings are at the forefront of the Oil-Free turbomachinery revolution, which supports gas turbine engines with hydrodynamic bearings that use air instead of oil as the working fluid. These types of bearings have been around for almost 50 years and have found a home in several commercial applications, such as in air cycle machines, turbocompressors, and microturbines, but are now being aggressively pursued for use in small and midrange aircraft gas turbine engines. Benefits include higher operating speeds and temperatures, lower maintenance costs, and greater reliability. The Oil-Free Turbomachinery team at the NASA Glenn Research Center is working to foster the transition of Oil-Free technology into gas turbine engines by performing in-house experiments on foil air bearings in order to gain a greater insight into their complex operating principles. A research program recently undertaken at Glenn focused on the concept of radial clearance and its influence on bearing performance. The tests were conducted on foil bearings with different radial clearances. As defined for a foil bearing, radial clearance is a measure of the small amount of shaft radial motion that is present from play that exists in the elastic support structure, such as between the top and bump foils and the bump foils and bearing shell (see the drawing). With an insufficient amount of radial clearance, the bearing imparts a high preload on the shaft, which when excessive, can reduce the loadcarrying capability of the bearing. On the other hand, systems using foil bearings with excessive radial clearance may experience rotordynamic instabilities because of low bearing preload. Therefore, without a more thorough understanding of radial clearance, it is difficult to accurately predict the performance of a given bearing design. The test program demonstrated that there is a direct correlation between radial clearance and the performance of foil air bearings. As shown in the graph, an

  3. Radial optimization of a BWR fuel cell using genetic algorithms; Optimizacion radial de una celda de combustible BWR usando algoritmos geneticos

    Energy Technology Data Exchange (ETDEWEB)

    Martin del Campo M, C.; Carmona H, R.; Oropeza C, I.P. [UNAM, Paseo Cuauhnahuac 8532, 62550 Jiutepec, Morelos (Mexico)]. e-mail: cmcm@fi-b.unam.mx

    2006-07-01

    The development of the application of the Genetic Algorithms (GA) to the optimization of the radial distribution of enrichment in a cell of fuel of a BWR (Boiling Water Reactor) is presented. The optimization process it was ties to the HELIOS simulator, which is a transport code of neutron simulation of fuel cells that has been validated for the calculation of nuclear banks for BWRs. With heterogeneous radial designs can improve the radial distribution of the power, for what the radial design of fuel has a strong influence in the global design of fuel recharges. The optimum radial distribution of fuel bars is looked for with different enrichments of U{sup 235} and contents of consumable poison. For it is necessary to define the representation of the solution, the objective function and the implementation of the specific optimization process to the solution of the problem. The optimization process it was coded in 'C' language, it was automated the creation of the entrances to the simulator, the execution of the simulator and the extraction, in the exit of the simulator, of the parameters that intervene in the objective function. The objective function includes four parameters: average enrichment of the cell, average gadolinia concentration of the cell, peak factor of radial power and k-infinite multiplication factor. To be able to calculate the parameters that intervene in the objective function, the one evaluation process of GA was ties to the HELIOS code executed in a Compaq Alpha workstation. It was applied to the design of a fuel cell of 10 x 10 that it can be employee in the fuel assemble designs that are used at the moment in the Laguna Verde Nucleo electric Central. Its were considered 10 different fuel compositions which four contain gadolinia. Three heuristic rules that consist in prohibiting the placement of bars with gadolinia in the ends of the cell, to place the compositions with the smallest enrichment in the corners of the cell and to fix

  4. Efeito de sanificantes no controle pós-colheita da podridão parda (Monilinia fructicola) e da podridão mole (Rhizopus stolonifer) em pêssegos

    OpenAIRE

    Abreu,Fabiana Marchi de; Lourenço,Silvia Afonseca; Bassetto,Eliane; Gonçalves,Fabrício Packer; Martins,Marise Cagnim; Amorim,Lilian

    2008-01-01

    O objetivo desse trabalho foi avaliar o efeito in vitro e in vivo dos sanificantes cloreto de benzalcônio (Fegatex®), biomassa cítrica (Ecolife40®) e ozônio no controle da podridão parda (Monilinia fructicola) e da podridão mole (Rhizopus stolonifer) em pêssegos das cultivares Aurora, Dourado e Flor da Prince. Cloreto de benzalcônio e biomassa cítrica, aplicados in vitro, ambos na concentração de 1000 mL L-1, inibiram totalmente o crescimento radial (micelial) de M. fructicola, porém nenhum d...

  5. A Sintaxe da Janela

    Directory of Open Access Journals (Sweden)

    Luís Antônio Jorge

    1993-12-01

    Full Text Available A preocupação fundamenta! do trabalho é de caráter ontológico: esboçar o problema das significações apriorísticas e autônomas dos elementos que compõem a sintaxe arquitetônica. O trabalho elege um desses elementos: a janela. Este artigo parte da aproximação histórica entre a janela e a secção da pirâmide visual, construção imaginária da teoria da perspectiva renascentista. A consideração da janela na linguagem arquitetônica implica reconhecer uma ambigüidade essencial: a janela deve inserir-se ordenadamente no plano da parede - raciocínio típico da modenatura - mas também relacionar-se com a imagem vista através dela, que extrapola o plano, ressaltando a tridimensionalidade - herança da perspectiva renascentista, fundamentada no espaço euclidiano. Ver janela ou ver através da janela são alternativas que se colocam tanto ao observador interno ao edifício, quanto ao externo. Texto de duplaface, a sintaxe da janela versa sobre o relacionamento desses dois lados

  6. Rotary and radial forcing effects on center-of-mass locomotion dynamics.

    Science.gov (United States)

    Shen, Z H; Larson, P L; Seipel, J E

    2014-09-01

    Rotary and radial forcing are two common actuation methods for legged robots. However, these two orthogonal methods of center-of-mass (CoM) forcing have not been compared as potentially alternative strategies of actuation. In this paper, we compare the CoM stability and energetics of running with rotary and radial actuation through the simulation of two models: the rotary-forced spring-loaded inverted pendulum (rotary-forced-SLIP), and the radially-forced-SLIP. We model both radial and rotary actuation in the simplest way, applying them as a constant force during the stance portion of the gait. A simple application of constant rotary forcing throughout stance is capable of producing fully-asymptotically stable motion; however, a similarly constant application of radial forcing throughout the stance is not capable of producing stable solutions. We then allow both the applied rotary and radial forcing functions to turn on or off based on the occurrence of the mid-stance event, which breaks the symmetry of actuation during stance towards a net forward propulsion. We find that both a rotary force applied in the first half of stance and a radial force applied in the second half of stance, are capable of stabilizing running. Interestingly, these two forcing methods improve the motion stability in different ways. Rotary forcing first reduces then greatly increases the size of the stable parameter region when gradually increased. Radial forcing expands the stable parameter region, but only in a moderate way. Also, it is found that parameter region stabilized by rotary and radial forcing are largely complementary. Overall, rotary forcing can better stabilize running for both constant and event-based forcing functions that were attempted. This indicates that rotary forcing has an inherent capability of stabilizing running, even when minimal time-or-event-or-state feedback is present. Radial forcing, however, tends to be more energy efficient when compared to rotary forcing

  7. Radial Propagation of Magnetospheric Substorm Injected Energetic Electrons Observed by BD-IES and Van Allan Probes

    Science.gov (United States)

    Zong, Q.

    2016-12-01

    When substorm injections are observed simultaneously with multiple spacecraft, they help elucidate potential mechanisms for particle transport and energization, a topic of great importance for understanding and modeling the magnetosphere. In the present paper, by using the data return from the BeiDa- IES (BD-IES) instrument onboard an inclined (55°) geosynchronous orbit (IGSO) satellite together with geo-transfer orbit (GTO) Van Allen Probe A&B satellite, we analysis a substorm injection event occurred on Oct 16, 2015. During the substorm injection, the IES onboard IGSO is outbound while both Van Allen Probe A&B satellites are inbound. This configuration of multiple satellite trajectories provides a unique opportunity to investigate the inward and outward radial propagation of the substorm injection simultaneously. This substorm as indicated by AE/AL indices is closely related an IMF/solar wind discontinuity with a sharp change in the IMF Bz direction (northward turning). The innermost signature of this substorm injection has been detected by the Van Allen Probes A & B at L 3.7. The outermost signature, observed by the BD-IES, is found to be at L 10. This indicated that this substorm have a rather global effect rather than just a local effect. Further, we suggest that the electric fields carried by fast-mode compressional waves around the substorm injection are the most likely mechanism candidate for the injection signatures of electrons observed in the innermost and outermost inner magnetosphere.

  8. Genealogias da alegria

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    Bruno Vasconcelos de Almeid

    2009-08-01

    Full Text Available Genealogias da Alegria tem por objetivo rastrear conceitos e construir planos sobre os quais podemos pensar a alegria como campo problemático. Trata-se de traçar linhas e acoplar fragmentos históricos e literários com a finalidade de subsidiar a discussão contemporânea em torno da alegria. O procedimento genealógico vale-se de trechos das obras de Calímaco e Luciano de Samósata, da elegia erótica romana e da alegria cristã. O passo seguinte consiste em rastrear o pensamento da alegria na obra de Gilles Deleuze, especialmente em três momentos: uma passagem de Diferença e Repetição, um trecho dos Diálogos extraído de Da Superioridade da Literatura Anglo-americana e a comunicação Pensamento Nômade no Colóquio de Cerisy. A alegria não se define como sentimento ou emoção; ao contrário, está ligada à premissa de afirmação da vida e ao caráter trágico da existência.

  9. Impeller radial force evolution in a large double-suction centrifugal pump during startup at the shut-off condition

    Energy Technology Data Exchange (ETDEWEB)

    Zou, Zhichao [College of Water Resources and Civil Engineering, China Agricultural University, Beijing 100083 (China); Wang, Fujun, E-mail: wangfj@cau.edu.cn [College of Water Resources and Civil Engineering, China Agricultural University, Beijing 100083 (China); Beijing Engineering Research Center of Safety and Energy Saving Technology for Water Supply Network System, China Agricultural University, Beijing 100083 (China); Yao, Zhifeng [College of Water Resources and Civil Engineering, China Agricultural University, Beijing 100083 (China); Beijing Engineering Research Center of Safety and Energy Saving Technology for Water Supply Network System, China Agricultural University, Beijing 100083 (China); Tao, Ran [College of Water Resources and Civil Engineering, China Agricultural University, Beijing 100083 (China); Xiao, Ruofu [College of Water Resources and Civil Engineering, China Agricultural University, Beijing 100083 (China); Beijing Engineering Research Center of Safety and Energy Saving Technology for Water Supply Network System, China Agricultural University, Beijing 100083 (China); Li, Huaicheng [Shanghai Liancheng (Group) Co., Ltd., Shanghai 201812 (China)

    2016-12-15

    Highlights: • Conclude the characteristics of transient radial force in the startup process for a large double-suction centrifugal pump. • The overall direction of the radial force during startup process is also confirmed. • A formula used to calculate the transient radial force during startup process is proposed. • A relationship between radial force variation and axial vortex development in blade channel during the startup process is established. The mechanism of the radial force evolution is revealed. - Abstract: Double-suction centrifugal pumps play an important role in the main feedwater systems of nuclear power plant. The impeller radial force in a centrifugal pump varies dramatically during startup at the shut-off condition. In this study, the startup process of a large double-suction centrifugal pump is investigated using CFD. During testing, the impeller speed is accelerated from zero to its rated speed in 1.0 s (marked as t{sub 0}) and is then maintained at the rated speed. The results show that the radial force increase lags behind the impeller speed increase. At 0–0.4t{sub 0}, the radial force is small (approaching zero). At 0.4–1.4t{sub 0}, the radial force increases rapidly. After 1.4t{sub 0}, the average radial force stabilizes and reaches its maximum value of 55,619 N. The observed maximum radial force value during startup is approximately nine times as high as the radial force under rated condition. During startup, the overall radial force direction is proximate to the radial line located 25° from the volute tongue along circumferential direction. A transient radial force formula is proposed to evaluate the changes in radial force during startup. The streamline distribution in impeller passages and the impeller outlet pressure profile varying over time are produced. The relationship between radial force evolution and the varying axial-to-spiral vortex structure is analyzed. The radial force change mechanism is revealed. This research

  10. Experimental and theoretical study of friction torque from radial ball bearings

    Science.gov (United States)

    Geonea, Ionut; Dumitru, Nicolae; Dumitru, Ilie

    2017-10-01

    In this paper it is presented a numerical simulation and an experimental study of total friction torque from radial ball bearings. For this purpose it is conceived a virtual CAD model of the experimental test bench for bearing friction torque measurement. The virtual model it is used for numerical simulation in Adams software, that allows dynamic study of multi-body systems and in particularly with facility Adams Machinery of dynamic behavior of machine parts. It is manufactured an experimental prototype of the test bench for radial ball bearings friction torque measurement. In order to measure the friction torque of the tested bearings it is used an equal resistance elastic beam element, with strain gauge transducer to measure bending deformations. The actuation electric motor of the bench has the shaft mounted on two bearings and the motor housing is fixed to the free side of the elastic beam, which is bended by a force proportional with the total friction torque. The beam elastic element with strain gauge transducer is calibrated in order to measure the force occurred. Experimental determination of the friction torque is made for several progressive radial loads. It is established the correlation from the friction torque and bearing radial load. The bench allows testing of several types and dimensions of radial bearings, in order to establish the bearing durability and of total friction torque.

  11. Radial glial neural progenitors regulate nascent brain vascular network stabilization via inhibition of Wnt signaling.

    Directory of Open Access Journals (Sweden)

    Shang Ma

    Full Text Available The cerebral cortex performs complex cognitive functions at the expense of tremendous energy consumption. Blood vessels in the brain are known to form stereotypic patterns that facilitate efficient oxygen and nutrient delivery. Yet little is known about how vessel development in the brain is normally regulated. Radial glial neural progenitors are well known for their central role in orchestrating brain neurogenesis. Here we show that, in the late embryonic cortex, radial glial neural progenitors also play a key role in brain angiogenesis, by interacting with nascent blood vessels and regulating vessel stabilization via modulation of canonical Wnt signaling. We find that ablation of radial glia results in vessel regression, concomitant with ectopic activation of Wnt signaling in endothelial cells. Direct activation of Wnt signaling also results in similar vessel regression, while attenuation of Wnt signaling substantially suppresses regression. Radial glial ablation and ectopic Wnt pathway activation leads to elevated endothelial expression of matrix metalloproteinases, while inhibition of metalloproteinase activity significantly suppresses vessel regression. These results thus reveal a previously unrecognized role of radial glial progenitors in stabilizing nascent brain vascular network and provide novel insights into the molecular cascades through which target neural tissues regulate vessel stabilization and patterning during development and throughout life.

  12. Tensile radial stress in the spinal cord related to arachnoiditis or tethering: a numerical model.

    Science.gov (United States)

    Bertram, C D; Bilston, L E; Stoodley, M A

    2008-07-01

    Spinal arachnoiditis comprises fibrous scarring of the subarachnoid space, following spinal trauma or inflammation, and is often associated with syringomyelia. We hypothesised that cord-to-dura attachments could cause transient tensile cord radial stress, as pressure waves propagate. This was tested in a fluid-structure interaction model, simulating three types of cord tethering, with 'arachnoiditis' confined to a short mid-section of the cord. The annular system was excited abdominally with a short transient, and the resulting Young and Lamb waves and reflections were analysed. Radial mid-section tethering was less significant than axial tethering, which gave rise to tensile radial stress locally when the cord was not fixed cranially. Simulated as inextensible string connections to the dura, arachnoiditis caused both localised tensile radial stress and localised low pressure in the cord as the transient passed. The extent of these effects was sensitive to the relative stiffness of the dura and cord. Tensile radial stress may create a syrinx in previously normal cord tissue, and transiently lowered pressure may draw in interstitial fluid, causing the syrinx to enlarge if fluid exit is inhibited. The suggested mechanism could also explain the juxtaposition of syrinxes to regions of arachnoiditis.

  13. Analysis on Coupled Vibration of a Radially Polarized Piezoelectric Cylindrical Transducer.

    Science.gov (United States)

    Xu, Jie; Lin, Shuyu; Ma, Yan; Tang, Yifan

    2017-12-08

    Coupled vibration of a radially polarized piezoelectric cylindrical transducer is analyzed with the mechanical coupling coefficient method. The method has been utilized to analyze the metal cylindrical transducer and the axially polarized piezoelectric cylindrical transducer. In this method, the mechanical coupling coefficient is introduced and defined as the stress ratio in different directions. Coupled vibration of the cylindrical transducer is regarded as the interaction of the plane radial vibration of a ring and the longitudinal vibration of a tube. For the radially polarized piezoelectric cylindrical transducer, the radial and longitudinal electric admittances as functions of mechanical coupling coefficients and angular frequencies are derived, respectively. The resonance frequency equations are obtained. The dependence of resonance frequency and mechanical coupling coefficient on aspect ratio is studied. Vibrational distributions on the surfaces of the cylindrical transducer are presented with experimental measurement. On the support of experiments, this work is verified and provides a theoretical foundation for the analysis and design of the radially polarized piezoelectric cylindrical transducer.

  14. [Traumatic wound dehiscence and corneal rupture 3 1/2 years after radial keratotomy].

    Science.gov (United States)

    Reichel, M B; Busin, M; Koch, F; Sekundo, W

    1995-04-01

    Severe complications such as a traumatic wound dehiscence have been described very rarely after radial keratotomy. The following case demonstrates for the first time that wound healing is not completed even 31/2 years postoperatively and that therefore an ocular blunt trauma may still cause a dehiscence of the radial incisions. A 22-year-old patient presented in July 1993 to our emergency unit because of a corneal perforation in his right eye after a blunt trauma. His past medical history was significant for radial keratotomy surgery performed in January 1990 to correct a bilateral low-degree myopia (OD = -3.25 D; OS = -3.75 D). At surgery a horizontal rupture running through the entire cornea and including the two radial keratotomies at the 3 and 9 o'clock position was evident. The whole iris and lens were missing. The retina was completely detached. The corneal laceration was sutured. Twelve days later the retina was reattached with an encircling band, vitrectomy, endolaser and cryocoagulation, as well as silicone oil fill. Finally, a penetrating keratoplasty was performed 6 months after the accident. Thereafter, visual acuity improved to 0.1. The histologic examination of the corneal button showed that the wound healing of the incisions that had remained intact was not completed yet. Epithelial plugs of various size were still filling the somewhat dehiscent wound margins. Fibroblastic activity was detected in the surrounding stroma. Even several years after surgery, blunt traumas represent a definite risk for eyes undergoing radial keratotomy.

  15. A new technique of fixation of radial head fractures using a modified tubular plate

    Directory of Open Access Journals (Sweden)

    Guha A

    2004-04-01

    Full Text Available Radial head fractures are fairly common, occurring in 17-44% of all elbow injuries. Mason Type 2 fractures may be fixed using mini fragment screws, this fixation often needing augmentation with a plate to make the construct rotationally stable. However, the drill holes needed to fix the plate to the radial head, carry the risk of inflicting more injury to the fractured fragments. In our case, the radial head fracture was fixed with a modified one-third tubular plate. The plate was cut through the distal hole and the two cut ends were bent into hooks. These two hooks were engaged into two breaches made on the margin of the radial head and this provided rotational stability to the head without causing further damage. The fracture healed well and the patient regained full movement in the elbow. We conclude that this method may be used to fix fractures of the radial head, which require additional support with a plate.

  16. Algebraic Reconstruction Technique (ART) for parallel imaging reconstruction of undersampled radial data: Application to cardiac cine

    Science.gov (United States)

    Li, Shu; Chan, Cheong; Stockmann, Jason P.; Tagare, Hemant; Adluru, Ganesh; Tam, Leo K.; Galiana, Gigi; Constable, R. Todd; Kozerke, Sebastian; Peters, Dana C.

    2014-01-01

    Purpose To investigate algebraic reconstruction technique (ART) for parallel imaging reconstruction of radial data, applied to accelerated cardiac cine. Methods A GPU-accelerated ART reconstruction was implemented and applied to simulations, point spread functions (PSF) and in twelve subjects imaged with radial cardiac cine acquisitions. Cine images were reconstructed with radial ART at multiple undersampling levels (192 Nr x Np = 96 to 16). Images were qualitatively and quantitatively analyzed for sharpness and artifacts, and compared to filtered back-projection (FBP), and conjugate gradient SENSE (CG SENSE). Results Radial ART provided reduced artifacts and mainly preserved spatial resolution, for both simulations and in vivo data. Artifacts were qualitatively and quantitatively less with ART than FBP using 48, 32, and 24 Np, although FBP provided quantitatively sharper images at undersampling levels of 48-24 Np (all pART was comparable to CG SENSE. GPU-acceleration increased ART reconstruction speed 15-fold, with little impact on the images. Conclusion GPU-accelerated ART is an alternative approach to image reconstruction for parallel radial MR imaging, providing reduced artifacts while mainly maintaining sharpness compared to FBP, as shown by its first application in cardiac studies. PMID:24753213

  17. Validation of a standardized mapping system of the hip joint for radial MRA sequencing

    Energy Technology Data Exchange (ETDEWEB)

    Klenke, Frank M.; Hoffmann, Daniel B.; Cross, Brian J.; Siebenrock, Klaus A. [Bern University Hospital, Department of Orthopedic Surgery, Inselspital, Bern (Switzerland)

    2014-10-14

    Intraarticular gadolinium-enhanced magnetic resonance arthrography (MRA) is commonly applied to characterize morphological disorders of the hip. However, the reproducibility of retrieving anatomic landmarks on MRA scans and their correlation with intraarticular pathologies is unknown. A precise mapping system for the exact localization of hip pathomorphologies with radial MRA sequences is lacking. Therefore, the purpose of the study was the establishment and validation of a reproducible mapping system for radial sequences of hip MRA. Sixty-nine consecutive intraarticular gadolinium-enhanced hip MRAs were evaluated. Radial sequencing consisted of 14 cuts orientated along the axis of the femoral neck. Three orthopedic surgeons read the radial sequences independently. Each MRI was read twice with a minimum interval of 7 days from the first reading. The intra- and inter-observer reliability of the mapping procedure was determined. A clockwise system for hip MRA was established. The teardrop figure served to determine the 6 o'clock position of the acetabulum; the center of the greater trochanter served to determine the 12 o'clock position of the femoral head-neck junction. The intra- and inter-observer ICCs to retrieve the correct 6/12 o'clock positions were 0.906-0.996 and 0.978-0.988, respectively. The established mapping system for radial sequences of hip joint MRA is reproducible and easy to perform. (orig.)

  18. Assessing individual radial junction solar cells over millions on VLS-grown silicon nanowires.

    Science.gov (United States)

    Yu, Linwei; Rigutti, Lorenzo; Tchernycheva, Maria; Misra, Soumyadeep; Foldyna, Martin; Picardi, Gennaro; Roca i Cabarrocas, Pere

    2013-07-12

    Silicon nanowires (SiNWs) grown on low-cost substrates provide an ideal framework for the monolithic fabrication of radial junction photovoltaics. However, the quality of junction formation over a random matrix of SiNWs, fabricated via a vapor-liquid-solid (VLS) mechanism, has never been assessed in a realistic context. To address this, we probe the current response of individual radial junction solar cells under electron-beam and optical-beam excitations. Excellent current generation from the radial junction units, compared to their planar counterparts, has been recorded, indicating a high junction quality and effective doping in the ultra-thin SiNWs with diameters thinner than 20 nm. Interestingly, we found that the formation of radial junctions by plasma deposition can be quite robust against geometrical disorder and even the crossings of neighboring cell units. These results provide a strong support to the feasibility of building high-quality radial junction solar cells over high-throughput VLS-grown SiNWs on low-cost substrates.

  19. A Radial Age Gradient in the Geometrically Thick Disk of the Milky Way

    Science.gov (United States)

    Martig, Marie; Minchev, Ivan; Ness, Melissa; Fouesneau, Morgan; Rix, Hans-Walter

    2016-11-01

    In the Milky Way, the thick disk can be defined using individual stellar abundances, kinematics, or age, or geometrically, as stars high above the midplane. In nearby galaxies, where only a geometric definition can be used, thick disks appear to have large radial scale lengths, and their red colors suggest that they are uniformly old. The Milky Way’s geometrically thick disk is also radially extended, but it is far from chemically uniform: α-enhanced stars are confined within the inner Galaxy. In simulated galaxies, where old stars are centrally concentrated, geometrically thick disks are radially extended, too. Younger stellar populations flare in the simulated disks’ outer regions, bringing those stars high above the midplane. The resulting geometrically thick disks therefore show a radial age gradient, from old in their central regions to younger in their outskirts. Based on our age estimates for a large sample of giant stars in the APOGEE survey, we can now test this scenario for the Milky Way. We find that the geometrically defined thick disk in the Milky Way has indeed a strong radial age gradient: the median age for red clump stars goes from ∼9 Gyr in the inner disk to 5 Gyr in the outer disk. We propose that at least some nearby galaxies could also have thick disks that are not uniformly old, and that geometrically thick disks might be complex structures resulting from different formation mechanisms in their inner and outer parts.

  20. Radial distribution of esophageal peristaltic pressure in normal subjects and patients with esophageal diverticulum.

    Science.gov (United States)

    Dodds, W J; Stef, J J; Hogan, W J; Hoke, S E; Stewart, E T; Arndorfer, R C

    1975-09-01

    This study was designed to determine the radial profile of peristaltic pressure waves in the esophageal body of normal subjects and patients with isophageal diverticulum. We used a manometric assembly featuring four radial side hole recording orifices oriented at equidistant 90 degree angles. Each recording catheter was infused with water at a rate (6.1 ml per min) which provided high fidelity pressure recording. In normal subjects, the radially recorded peristaltic pressure complexes were similar in peak amplitude and wave form. The range of pressure differences between the four radial recordings averaged 9.0 +/- 4 SD mm Hg A range is less than or greater to 25 mm Hg occurring in 99% of observations. These variations in pressure amplitude showed no consistant spacial orientation. In 5 of the 6 patients with esophageal diverticulum, the range of radial peristaltic pressure differences exceeded 25 mm Hg in the region of the diverticulum, the lowest pressure occurring at the recording orifice facing the diverticulum mouth. In occasional peristaltic sequences abnormal wave forms featuring abrupt onsets or offsets were observed. These bizarre wave forms were probably caused by oralaboral diverticulum movement relative to the recording sensor during peristalsis. Two patients had abnormally high peristaltic pressure amplitudes, greater than 250 mm Hg. This latter finding introduces the possibility that hypertensive peristaltic contractions may contribute to diverticulum production in some patients.