Self-powered proton detectors based on GaN core shell p n microwires

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Radiation sensors based on GaN microwires

International audienc

Use of ZnO thin films as sacrificial templates for metal organic vapor phase epitaxy and chemical lift-off of GaN

Continued development of GaN-based light emitting diodes is being hampered by constraints imposed by current non-native substrates. ZnO is a promising alternative substrate but it decomposes under the conditions used in conventional GaN metal organic vapor phase epitaxy (MOVPE). In this work, GaN was grown on ZnO/c-Al2O3 using low temperature/pressure MOVPE with N2 as a carrier and dimethylhydrazine as a N source. Characterization confirmed the epitaxial growth of GaN. The GaN was lifted-off the c-Al2O3 by chemically etching away the ZnO underlayer. This approach opens up the way for bonding of the GaN onto a support of choice

Medicamentos excepcionais para doença renal crônica: gastos e perfil de utilização em Minas Gerais, Brasil Dispensing of exceptional drugs for chronic renal failure: expenditures and patients' profile in Minas Gerais State, Brazil

No Brasil, os medicamentos para o tratamento da doença renal crônica são disponibilizados gratuitamente pelo Sistema Único de Saúde (SUS). Este estudo teve como objetivos descrever os gastos públicos com esses medicamentos em Minas Gerais, Brasil, e o perfil dos usuários; objetivou, também, analisar os fatores associados ao gasto médio mensal individual. Observou-se que o gasto total com os medicamentos estudados (R$41,6 milhões) representa uma parcela significativa do gasto total com procedimentos ambulatoriais no SUS (9,6$ 41.6 million, or U$25 million) represents a significant portion of total spending on outpatient procedures in the National health System (9.6%). Most patients are young adult males with arterial hypertension as the main cause of chronic renal failure. Multivariate analysis showed a trend towards lower spending on elderly patients, those with diabetes as the main underlying disease, those using iron hydroxide, and in municipalities with a lower human development index, or HDI (p < 0.05). Finally, the study indicated the importance of management tools that allow monitoring the trajectory of individual patients in the health system and support appropriate health policymaking