45 research outputs found

    Understanding random-walk dynamical phase coexistence through waiting times

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    We study the appearance of first-order dynamical phase transitions (DPTs) as `intermittent' co-existing phases in the fluctuations of random walks on graphs. We show that the diverging time scale leading to critical behaviour is the waiting time to jump from one phase to another. This time scale is crucial for observing the system's relaxation to stationarity and demonstrates ergodicity of the system at criticality. We illustrate these results through three analytical examples which provide insights into random walks exploring random graphs.Comment: 8 pages, 6 figures. v2: fixed minor typos + added reference

    Development and psychometric testing of a theory-based tool to measure self-care in diabetes patients: the Self-Care of Diabetes Inventory

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    Background: Self-care is essential for patients with diabetes mellitus. Both clinicians and researchers must be able to assess the quality of that self-care. Available tools have various limitations and none are theoretically based. The aims of this study were to develop and to test the psychometric properties of a new instrument based on the middle range-theory of self-care of chronic illness: the Self-Care of Diabetes Inventory (SCODI). Methods: Forty SCODI items (5 point Likert type scale) were developed based on clinical recommendations and grouped into 4 dimensions: self-care maintenance, self-care monitoring, self-care management and self-care confidence based on the theory. Content validity was assessed by a multidisciplinary panel of experts. A multi-centre cross-sectional study was conducted in a consecutive sample of 200 type 1 and type 2 diabetes patients. Dimensionality was evaluated by exploratory factor analyses. Multidimensional model based reliability was estimated for each scale. Multiple regression models estimating associations between SCODI scores and glycated haemoglobin (HbA1c), body mass index, and diabetes complications, were used for construct validity. Results: Content validity ratio was 100%. A multidimensional structure emerged for the 4 scales. Multidimensional model-based reliabilities were between 0.81 (maintenance) and 0.89 (confidence). Significant associations were found between self-care maintenance and HbA1c (p = 0.02) and between self-care monitoring and diabetes complications (p = 0.04). Self-care management was associated with BMI (p = 0.004) and diabetes complications (p = 0.03). Self-care confidence was a significant predictor of self-care maintenance, monitoring and management (all p < 0.0001). Conclusion: The SCODI is a valid and reliable theoretically-grounded tool to measure self-care in type 1 and type 2 DM patients

    Escolas técnicas agrícolas desenvolvendo as ciências agroambientais.

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    Sendo as atividades agropecuárias grandes responsáveis pela poluição difusa no planeta, com práticas que utilizam agrotóxicos, manejo de solos incorreto, adubos químicos, irrigação, criação de animais próxima a nascentes e outras, há necessidade imediata de reflexões sobre o modelo de agropecuária que vem sendo desenvolvida, como também planejamento de utilização dos recursos naturais envolvidos. No Centro Paula Souza existe cursos nas áreas de Agricultura e de Pecuária, ou correlacionados, como os de Técnico Florestal, de Meio Ambiente e de Recursos Hídricos, nos quais há a necessidade de se reciclar os professores que, adquirindo novos conhecimentos, possam formar alunos em sintonia com a nova realidade que se apresenta. Dessa forma, o Centro Paula Souza, a Embrapa e o Centro de Pesquisa Mokiti Okada buscaram formalizar parceria no sentido de fortalecer um arranjo institucional de apoio, ao desenvolvimento e à transferência de tecnologia, às unidades escolares. Pretende-se assim, a cooperação técnica e metodológica com conhecimentos que contribuam para o processo de formação dos técnicos por práticas agrícolas e pecuárias sustentáveis e pela gestão ambiental das unidades envolvidas. No ano de 2003 a coordenação do projeto fez convite às 34 escolas agropecuárias do Centro Paula Souza para que pudessem desenvolvê-lo com o envolvimento de professores e da direção e disponibilizando área para tanto. Algumas das escolas já estavam engajadas de alguma forma e sensibilizadas para a produção mais sustentável e orgânica de alimentos. Dessa forma os professores e diretores de oito escolas técnicas agrícolas tiveram suas inscrições realizadas para início do projeto no novo ano letivo

    Veslanje na Geodetskom fakultetu

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    Ovaj članak ukratko predstavlja veslačku sekciju Geodetskog fakulteta – njezine aktivnosti, natjecanja i fotografije
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