Acoustic Transport
Mostrando 1-12 de 12 artigos, teses e dissertações.
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1. Hot electron transport properties in characteristics of wurtzite GaN MESFETs using a five-valley model
Ensemble Monte Carlo simulations have been carried out to investigate the effects of upper valleys on the characteristics of wurtzite GaN MESFETs. Electronic states within the conduction band valleys at the Γ1, U, M, Γ3 and K are represented by non-parabolic ellipsoidal valleys centred on important symmetry points of the Brillouin zone. The following scatt
Brazilian Journal of Physics. Publicado em: 2010-09
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2. Tin and zinc oxides semiconductor devices / Dispositivos semicondutores a partir de óxidos de estanho e zinco
This work presents the study and development of semiconductor devices base on tin and zinc oxides. The first device is related to the development of pH sensors based on field effect, while the second device uses surface acoustic waves for the transport of carriers related to a single photon detector device. Initially, the semiconductors were used as hydrogen
Publicado em: 2009
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3. Processos dinÃmicos e evolutivos da zona costeira de Itamaracà por sensoriamento remoto e medidas in situ
The coastal zone of Itamaracà is like a highly dynamic environment where land and oceanic processes interact altering frequently coastal characteristics. In this context, this current study examines the responsible processes of such changes from the development and application of methodologies, which includes digital image processing and the obtaining of in
Publicado em: 2009
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4. Transporte de volume e condições hidrográficas no Canal de São Sebastião / Volume transport and hydrographic conditions in the São Sebastião Channel
Current data obtained using an "Acoustic Doppler Current Profiler " (ADCP) towed by a research boat and nearly synoptic hydrographic data were sampled in the São Sebastião Channel (SSC) during six cruises between 2001 and 2006. This study also uses ocean-surface wind fields for the South Brazil Bight (SBB) area derived from the QuikSCAT scatterometer. The
Publicado em: 2008
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5. Desempenho acústico das janelas de hospitais localizados em São Paulo / Acoustic performance of the windows of located hospitals in São Paulo.
The noise of transport traffic comes as one of the main problems generated by the intense urbanization of the cities, above all in the great metropolises. In fact, this situation affects considerable portion of the population, causing uncomfortable and reflexes in the physical and mental health condition. The municipal district of São Paulo, that now posses
Publicado em: 2007
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6. DinÃmica do microzooplÃncton no Canal de Santa Cruz, Pernambuco, Brasil
Studies were carried out to assess the transport dynamics and the microzooplanktonic community structure from the south and north inlets of Santa Cruz Channel (Itamaracà â PE) in relation to the adjacent shelf, considering tidal phases and depth. Plankton samples were taken with a pump at three stations along a transect across the inlets. At the central st
Publicado em: 2007
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7. CirculaÃÃo hidrodinÃmica na regiÃo costeira dos municÃpios de Recife e JaboatÃo dos Guararapes durante o verÃo austral
The SisBaHia model system was used to analyze the hydrodynamic circulation and the sediment transport potential on the coastal region of Recife and JaboatÃo dos Guararapes cities during the austral summer. In the first part of the study, the results of the hydrodynamic model were analyzed and compared with the experimental data gathered at sea with the Acou
Publicado em: 2007
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8. Efeito de esforços vibracionais na estrutura do tecido vegetal
The present work aims to study the effects of cyclic loading on selected mechanical properties of vegetative tissues. Farm machinery operations involved in all agricultural processes since seedling up to harvesting, transportation, packaging and storage is here considered as a potential generators of vibrating loading. Experiments were carried out on specime
Publicado em: 2003
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9. Hole transport characteristics in pure and doped GaSb
The steady state hole transport properties of GaSb were investigated by the Ensemble Monte Carlo method (EMC). In our model we taken in to account heavy and light hole valence bands, and the following scattering mechanisms: inelastic acoustic phonon; polar optical phonon; nonpolar optical; ionized impurity. The theoretical calculations are compared with avai
Brazilian Journal of Physics. Publicado em: 2002-06
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10. A bubble-driven microfluidic transport element for bioengineering
Microfluidics typically uses channels to transport small objects by actuation forces such as an applied pressure difference or thermocapillarity. We propose that acoustic streaming is an alternative means of directional transport at small scales. Microbubbles on a substrate establish well controlled fluid motion on very small scales; combinations (“doublet
National Academy of Sciences.
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11. Photosynthesis and State Transitions in Mitochondrial Mutants of Chlamydomonas reinhardtii Affected in Respiration1
Photosynthetic activities were analyzed in Chlamydomonas reinhardtii mitochondrial mutants affected in different complexes (I, III, IV, I + III, and I + IV) of the respiratory chain. Oxygen evolution curves showed a positive relationship between the apparent yield of photosynthetic linear electron transport and the number of active proton-pumping sites in mi
The American Society for Plant Biologists.
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12. Thyroid hormone is a critical determinant for the regulation of the cochlear motor protein prestin
The most impressive property of outer hair cells (OHCs) is their ability to change their length at high acoustic frequencies, thus providing the exquisite sensitivity and frequency-resolving capacity of the mammalian hearing organ. Prestin, a protein related to a sulfate/anion transport protein, recently has been identified and proposed as the OHC motor mole
The National Academy of Sciences.