1,588 research outputs found
Dynamic Thermal Analysis of a Power Amplifier
This paper presents dynamic thermal analyses of a power amplifier. All the
investigations are based on the transient junction temperature measurements
performed during the circuit cooling process. The presented results include the
cooling curves, the structure functions, the thermal time constant distribution
and the Nyquist plot of the thermal impedance. The experiments carried out
demonstrated the influence of the contact resistance and the position of the
entire cooling assembly on the obtained results.Comment: Submitted on behalf of TIMA Editions
(http://irevues.inist.fr/tima-editions
Un tarif de tonlieu inconnu, institué par le comte de Flandre Thierry d'Alsace (1128-1168) pour le port de <i>Littersuerua</i>, précurseur du port de Damme
onderzoeksrappor
Un tarif de tonlieu inconnu, institué par le comte de Flandre Thierry d'Alsace (1128-1168) pour le port de <i>Littersuerua</i>, précurseur du port de Damme
Passively viewing negatively valenced baby faces attenuates left amygdala activity in healthy females scoring high on 'Harm Avoidance'
Reduced left subgenual anterior cingulate cortical activity during withdrawal-related emotions in melancholic depressed female patients
Evidence of increased axillary blood flow velocity without increased handgrip strength and endurance in persons with a fibromuscular axillary arch
Background: The purpose of this in vivo study was to compare axillary artery blood flow velocity, and maximal handgrip strength and endurance performance in young subjects with and without an axillary arch (AA).
Materials and methods: One hundred and fifty-six young adults were screened for the presence of an AA on their dominant arm side. After physical examination subjects were checked using diagnostic echography for the presence of an AA. Sixteen subjects with an AA and 15 without an AA had their axillary artery peak systolic velocity quantified in 3 different arm positions using Doppler ultrasound. Maximal handgrip strength and endurance performance was quantified in the same positions using a functional rehabilitation system.
Results: Mean peak systolic velocity was significantly higher in the AA group compared to controls in abduction/external rotation of the arm during muscle relaxation (p = 0.003) and contraction (p = 0.01). No significant differences between groups were found for maximal handgrip strength and endurance performance.
Conclusions: This study provides evidence for a transient axillary artery compression by the AA in a throwing position. This is not reinforced by additional contraction of the shoulder muscles along with the AA. Axillary artery compression does not influence maximal handgrip strength and endurance performance in symptom-free young adults
Application of Structure Functions for the Investigation of Forced Air Cooling
This paper presents thermal analyses of a power amplifier placed in a wind
tunnel. All the investigations are based on the transient temperature
measurements performed during the circuit cooling process. The measured cooling
curves were used to compute the cumulative and differential structure functions
for the circuit with a heat sink. These functions helped to determine the
optimal values of circuit model parameters necessary for numerical thermal
simulations. The experiments demonstrated the influence of the wind speed on
the value of the heat transfer coefficient and consequently on the temperature
of the entire structure.Comment: Submitted on behalf of TIMA Editions
(http://irevues.inist.fr/tima-editions
No relevant cardiac, pharmacokinetic or safety interactions between roflumilast and inhaled formoterol in healthy subjects: an open-label, randomised, actively controlled study
Right prefrontal HF-rTMS attenuates right amygdala processing of negatively valenced emotional stimuli in healthy females
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