Fasciolose.

bitstream/item/59412/1/Midia-Fasciolose.pd

General model for delayed feedback and its application to transimpedance amplifier's bandwidth optimization

Delays in real systems can be of two types: i) intrinsic delays - due to the physical principles of operation of each electronic device; ii) designed delays - due to extra circuits used to add the desired delay. Previous work established the possibility of achieving bandwidth improvements using small delays inside the feedback loop of feedback amplifiers. The modeling approach followed on these contributions used only one designed delay element. The bandwidth reduction effect due to intrinsic delays was not considered on these contributions. This paper extends the concept to the general case of feedback amplifiers that incorporates delays of both types. An experimental demonstration using a simple 0.35μm BiCMOS transimpedance amplifier further confirms the proposed model. © 2006 IEEE

Weighted automata as coalgebras in categories of matrices

The evolution from non-deterministic to weighted automata represents a shift from qual- itative to quantitative methods in computer science. The trend calls for a language able to reconcile quantitative reasoning with formal logic and set theory, which have for so many years supported qualitative reasoning. Such a lingua franca should be typed, poly- morphic, diagrammatic, calculational and easy to blend with conventional notation. This paper puts forward typed linear algebra as a candidate notation for such a unifying role. This notation, which emerges from regarding matrices as morphisms of suitable categories, is put at work in describing weighted automata as coalgebras in such categories. Some attention is paid to the interface between the index-free (categorial) language of matrix algebra and the corresponding index-wise, set-theoretic notation.Fundação para a Ciência e a Tecnologia (FCT

Ageing and menopause considerations for women with HIV in the UK

OBJECTIVES: Treatment rollout has dramatically improved life expectancy for people with HIV and AIDS. Women represent a substantial proportion of patients in the UK (approximately one-third of patients in care are female according to the HIV Annual Report 2014). This study examines psychosocial and biomedical issues for women diagnosed with HIV in the UK, comparing those above and below 45 years of age to examine menopause and ageing issues. METHODS: Consecutive clinic attenders in a large outpatient London HIV clinic were invited to participate in the study. Data were available for 170 (68%) women. In 57 women above the age of 45 data were available regarding menopause detailed insights. RESULTS: Compared with women aged under 45, women >45 years old were significantly less likely to be in a relationship (P=0.01), had higher anxiety scores (P=0.002), more likely to be classified as moderate to severe (25.9% vs 9.1%; χ(2)=6.1, P=0.01). There were no differences in terms of suicidal ideation, which was high for both groups of women (56.6%). Older women had higher psychological symptoms on the MSAS scale form and significantly higher PHQ-9 depression levels. A higher proportion of older women scored above the cut-off point for moderate to severe depression (9.2% vs 21.8%; χ(2)=3.7, P=0.048). Fewer older women had no mental health challenges (26.1% vs 42.4%) and more had multiple comorbidities (P=0.07). CONCLUSIONS: The vast majority of women reported experiencing a variety of physical and psychological menopause-related symptoms and there was a high suicide ideation rate in both groups of women. Over half of the group of menopausal women recorded distressing symptoms such as hot flushes, sweating, decreased sexual desire, back pain, night sweats, avoiding intimacy, involuntary urination and skin changes, yet few sought help. Age-specific, psychosexual and menopause services should be routinely available for women with HIV

Cardiac Hydatid Cyst in a Child

Cardiac hydatid cyst is a rare disease, especially in children. An 11-year-old boy with a previous anaphylactic reaction and episodes of abdominal pain was admitted for workup of an acquired long systolic murmur. Echocardiographic investigation disclosed a tumor of the right ventricular anterior wall, with multiple loculations. Magnetic resonance imaging characterized it as a multilobular tumor with cyst formation and disclosed another cyst in the right pulmonary artery. With a positive ELISA reaction the child was admitted for surgery with the diagnosis of cardiac and pulmonary hydatid cysts. Cardiac surgery was performed with good results, followed by medical treatment with albendazole

Determinação de carotenoides em frutos de tucumã (Astrocaryum vulgare Mart.).

Neste trabalho teve-se como objetivo analisar e quantificar os carotenoides presentes no fruto de tucumã (Astrocaryum vulgare Mart.). Foram utilizadas quatro amostras de polpa in natura de frutos provenientes de diferentes acessos do banco de Germoplasmas da Embrapa Amazônia Oriental (BAG-Tucumã). A quantificação dos carotenoides foi feita por método espectrofotométrico e a identificação por comparação com dados da literatura. Os resultados indicaram a presença de diferentes carotenoides majoritários em cada uma das amostras, com concentrações variando de 135 a 444mg/g, em base seca. Estes resultados indicaram que os frutos do BAG-Tucumã têm diferentes perfis de carotenoides, necessitando de técnicas de análise mais precisas, como a cromatografia líquida de alta eficiência, para a devida identificação dos mesmos

Characterization of recycled carbon fibers reinforcing thermoplastic polymers

In recent years, the metallic materials used in the automotive sector have been replaced by plastic materials. Also associated with this, the recycling or reuse of plastics parts is increasingly important. This work appears framed within a project that intends to substitute thermosetting materials for thermoplastics materials, that will be apply in the automotive sector. So, this article compares two thermoplastics materials reinforced by recycled carbon fibers. In the first case, the used materials were layers of recycled carbon fiber prepreg with polypropylene (PP) and in the second case it were used layers of recycling carbon fiber and layers of PP nonwovens. Both materials were processed by compression moulding process, at the same temperature. After processing, the composite materials obtained were evaluated mechanically, physically and thermally. A flammability test was also carried out to verify if it could be used in the automotive sector. After the characterization tests, as a conclusion, the material that offers the better properties is the recycled carbon fiber prepreg with polypropylene, with both materials fulfilling the requirements of the flammability standard.P2020 - Individual Project SI I&DT nº NORTE-01-0247-FEDER-009292 - “Functional_dashboard – Functional components in composite material for vehicle interiors”.info:eu-repo/semantics/publishedVersio

Patterning of polymer nanofiber meshes by electrospinning for biomedical applications

The end-product of the electrospinning process is typically a randomly aligned fiber mesh or membrane. This is a result of the electric field generated between the drop of polymer solution at the needle and the collector. The developed electric field causes the stretching of the fibers and their random deposition. By judicious selection of the collector architecture, it is thus possible to develop other morphologies on the nanofiber meshes. The aim of this work is to prepare fiber meshes using various patterned collectors with specific dimensions and designs and to evaluate how those patterns can affect the properties of the meshes relevant to biomedical applications. This study aims at verifying whether it is possible to control the architecture of the fiber meshes by tailoring the geometry of the collector. Three different metallic collector topographies are used to test this hypothesis. Electrospun nonwoven patterned meshes of polyethylene oxide (PEO) and poly(ε-capro-lactone) (PCL) were successfully prepared. Those fiber meshes were analyzed by scanning electron microscopy (SEM). Both mechanical properties of the meshes and cell contacting experiments were performed to test the effect of the produced patterns over the properties of the meshes relevant for biomedical applications. The present study will evaluate cell adhesion sensitivity to the patterns generated and the effect of those patterns on the tensile properties of the fiber meshes

Desenvolvimento e aplicação do método Quick, Easy, Cheap, Effective, Rugged, and Safe (QuEChERS) na análise de resíduos de agrotóxicos em água e sedimento.

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