RESUMO
We investigate the magnetic field and temperature dependence of the single-electron spin lifetime in silicon quantum dots and find a lifetime of 2.8 ms at a temperature of 1.1 K. We develop a model based on spin-valley mixing and find that Johnson noise and two-phonon processes limit relaxation at low and high temperature, respectively. We also investigate the effect of temperature on charge noise and find a linear dependence up to 4 K. These results contribute to the understanding of relaxation in silicon quantum dots and are promising for qubit operation at elevated temperatures.
Assuntos
Ácido Ascórbico/uso terapêutico , Púrpura Trombocitopênica Trombótica/tratamento farmacológico , Adulto , Idoso , Feminino , Humanos , Imunoglobulina G/análise , Masculino , Pessoa de Meia-Idade , Contagem de Plaquetas , Púrpura Trombocitopênica Trombótica/sangue , Púrpura Trombocitopênica Trombótica/imunologiaRESUMO
A new method for objective assessment of cough under normal or pathological conditions is described. Thoracic coughing can be discriminated from any other pressure wave because of its relatively high frequency. This method was applied in a double blind crossover trial in 18 patients with respiratory disease.
Assuntos
Antitussígenos/uso terapêutico , Tosse/tratamento farmacológico , Ensaios Clínicos como Assunto , Codeína/uso terapêutico , Avaliação de Medicamentos/instrumentação , HumanosRESUMO
A simple instrument for detecting seizures is described. Vibrations of the bed due to movements of the patient were converted to electrical oscillations by movement of a loudspeaker coil in reversed mode as transducer. To distinguish between normal movements and those caused by a seizure, three criteria were used--the amplitude of the oscillations, the time interval between them, and the duration of a burst of oscillations, each parameter compared with a reference value for each patient.
