Dynamics of Tm-Ho energy transfer and deactivation of the F-3(4) low level of thulium in fluorozirconate glasses

The mechanism involved in the Tm3+ (F-3(4))-->Ho3+ (I-5(7)) energy transfer and Tm3+ (H-3(4), H-3(6))-->Tm3+ (F-3(4), F-3(4)) cross relaxation as a function of the donor and acceptor concentrations was investigated in Tm-Ho-codoped fluorozirconate glasses. The experimental transfer rates were determined for the Tm-->Ho energy transfer from the best fit of the acceptor luminescence decay using an expression which takes into account the Inokuti-Hirayama model and localized donor-to-acceptor interaction solution. The original acceptor solution derived from the Inokuti-Hirayama model fits well the acceptor luminescence transient only for low-concentrated systems. The results showed that a fast excitation diffusion that occurs in a very short time (t<Tm cross relaxation and Tm-->Ho energy transfer ions from H-3(4) and F-3(4) thulium states, respectively. (C) 2004 American Institute of Physics.

Highlights from the I international symposium of thrombosis and anticoagulation in internal medicine, October 23-25, 2008, Sao Paulo, Brazil

The importance of thrombosis and anticoagulation in clinical practice is rooted firmly in several fundamental constructs that can be applied both broadly and globally. Awareness and the appropriate use of anticoagulant therapy remain the keys to prevention and treatment. However, to assure maximal efficacy and safety, the clinician must, according to the available evidence, choose the right drug, at the right dose, for the right patient, under the right indication, and for the right duration of time. The first International Symposium of Thrombosis and Anticoagulation in Internal Medicine was a scientific program developed by clinicians for clinicians. The primary objective of the meeting was to educate, motivate and inspire internists, cardiologists and hematologists by convening national and international visionaries, thought-leaders and dedicated clinician-scientists in Sao Paulo, Brazil. This article is a focused summary of the symposium proceedings. © Springer Science+Business Media, LLC 2009.

Crítica periodística: a mediação das artes visuais na Folha de São Paulo e no Estado de São Paulo durante a 29a. Bienal de São Paulo (25/09 a 12/12 de 2010

Pós-graduação em Artes - IA

Morfologia do tecido ósseo de tíbias de frangos de corte submetidos à dieta com 25 hidrocolecalciferol

Conselho Nacional de Desenvolvimento Científico e Tecnológico (CNPq)

Avaliação do stent coronário eluidor de everolimus XIENCE TM V na cpopulação feminina latino-americana do estudo de braço único SPIRIT Women: acompanhamento clínico de um ano

INTRODUÇÃO: Os estudos com stents farmacológicos têm avaliado predominantemente populações masculinas de descendência europeia. O estudo de braço único SPIRIT Women avalia o stent eluidor de everolimus XIENCE TM V em lesões de novo complexas em uma população feminina do mundo real, incluindo pacientes latino-americanas. Esta análise permite compreender como essa população responde ao implante de stent, comparativamente a pacientes não-latino-americanas. MÉTODOS: Das 1.572 pacientes matriculadas em 73 locais fora dos Estados Unidos, 138 (9%) foram recrutadas na Argentina, no Brasil e na Venezuela. RESULTADOS: As lesões-alvo tinham diâmetro de referência do vaso entre 2,25 mm e 4 mm e extensão da lesão ≤ 28 mm. As características basais foram semelhantes entre os grupos, com exceção de maior prevalência de hipertensão arterial, infarto do miocárdio (IM) de parede anterior e história familiar de doença arterial coronária na coorte latino-americana. As lesões tendiam a ser mais complexas em mulheres latino-americanas, com menor diâmetro de referência do vaso-alvo, maior extensão da lesão, maior excentricidade e angulação e mais lesões tipo B2/C. Os eventos foram adjudicados de acordo com as definições do Academic Research Consortium. Em um ano, o desfecho combinado de morte por todas as causas, IM e revascularização do vaso-alvo (RVA) foi de 12,1% na população não-latino-americana e de 10,1% na população latino-americana (P = 0,58). CONCLUSÕES: Em um ano, os baixos índices de eventos cardíacos adversos, incluindo trombose do stent, falha da lesão-alvo, morte cardíaca, IM e RVA nas mulheres latino-americanas foram comparáveis aos das mulheres não-latino-americanas, apesar da maior complexidade das lesões. Esses resultados demonstram a segurança e a eficácia do stent XIENCE TM V nessa pequena coorte de pacientes latino-americanas, à semelhança do que é observado com populações maiores e mais variadas.

Faulted Structures in Li Ion Exchanged NaMO2 (M=Ni(0.25)Mn(0.75))

A family of LiMO2 materials (M=Ni0.25Mn0.75) was prepared from Na1.2-xLixMO∂ precursors (0≤x≤0.6) via ion exchange. The resulting IE products were examined via XRD and compared to simulated XRD patterns produced using DIFFax to determine the defect structures resulting from the IE process. For the 0.1≤x≤0.6 materials, it is observed that there are 3 LiMO2 sub-phases with different Li contents present. As the amount of Li in the precursor increases, the amount of each phase changes resulting in a net shift to higher 2-theta; corresponding to an overall decrease in lattice parameter, approaching the theoretical values for LiMO2. Additionally, as x increases, the probability of O3-type shifting increases, most likely due to an increase in the amount O3-Li2MO3 minority phase which acts to weaken bonds in the TM layer, allowing the O3 shift to occur more easily. For the x=0 IE product, it was seen that the product had an ~O2-type structure, but with lattice parameters closer to those expected for a NaMO2 material.

Laser-Sintern. Die Schluesseltechnologie des e-Manufacturing TM

e-Manufacturing™, das ist die schnelle, flexible und kostengünstige Fertigung von Produkten, Formen/Werkzeugen oder Modellen direkt aus elektronischen Daten. e-Manufacturing™ schließt Rapid Prototyping, Rapid Tooling oder Rapid Manufacturing ein, geht aber zugleich weit über den Gedanken der schnellen Verfügbarkeit hinaus. Zwar wird auch in Zukunft die schnelle Produktentwicklung eine immer wichtigere Rolle spielen, bei der e-Manufacturing™ für ein verkürztes Time to Market sorgt, Entwicklungskosten verringert und zur Risikominimierung beiträgt. Darüber hinaus entstehen aber auch neue Geschäftsmodelle, da Kleinserienproduktion, steigende Variantenvielfalt und eine individualisierte Produktion (Mass Customization) plötzlich möglich und wirtschaftlich sind und sich neue Logistikkonzepte wie (Spare) parts on demand entwickeln. Die neue Konstruktionsfreiheit des Laser-Sinterns ermöglicht neue Produktkonzepte. Minimale Einschränkungen durch das Fertigungsverfahren erlauben funktionelle Integration und die Fertigung des „Unmöglichen“, da kreisförmige und lineare Werkzeugbewegungen das Produktdesign nicht mehr beeinflussen bzw. limitieren. Auch die Fertigungskonzepte unterliegen einem Wandel und werden deutlich flexibler. Werkzeuglose Produktion, losgrößenangepasste Fertigung und dezentrale Fertigung on demand sind die Schlagworte der Zukunft. Der vorliegende Beitrag zeigt Beispiele für den erfolgreichen kommerziellen Einsatz von Laser-Sintern in allen Phasen des Produktlebenszyklus. Der Schwerpunkt liegt dabei auf der direkten Herstellung von Funktionsteilen in der Serienfertigung. Die entscheidenden Faktoren für eine erfolgreiche Einführung und Anwendung von e-Manufacturing™ werden diskutiert. Der Beitrag zeigt auf, wie die neuesten technologischen Innovationen im Laser-Sintern, speziell zur Produktivitätssteigerung, das Spektrum der Anwendungsfelder erweitern, in denen dieses Fertigungsverfahren kostengünstige Lösungen bietet.