Receptivity of boundary layers to distributed wall vibrations

Linear three-dimensional receptivity of boundary layers to distributed wall vibrations in the large Reynolds number limit (Re??) is studied in this paper. The fluid motion is analysed by means of the multiscale asymptotic technique combined with the method of matched asymptotic expansions. The body surface is assumed to be perturbed by small-amplitude oscillations being tuned in resonance with the neutral Tollmien–Schlichting wave at a certain point on the wall. The characteristic length of the resonance region is found to be O(Re-3/16), which follows from the condition that the boundary-layer non-parallelism and the wave amplitude growth have the same order of magnitude. The amplitude equation is derived as a solvability condition for the inhomogeneous boundary-value problem. Investigating detuning effects, we consider perturbations in the form of a wave packet with a narrow O(Re-3/16) discrete or continuous spectrum concentrated near the resonant wavenumber and frequency. The boundary-layer laminarization based on neutralizing the oncoming Tollmien–Schlichting waves (or wave packets) is also discussed

Cadmium telluride X-ray detectors

First, the energy resolution of CdTe X-ray counters of planar shape is calculated in the energy range 5-100 keV, assuming a constant field within the detector. Then, the experimental performance of the counters are compared to the calculations and the discrepancies are discussed

Cadmium telluride X-ray detectors

First, the energy resolution of CdTe X-ray counters of planar shape is calculated in the energy range 5-100 keV, assuming a constant field within the detector. Then, the experimental performance of the counters are compared to the calculations and the discrepancies are discussed.Dans une première partie de ce travail on a calculé la résolution en énergie de spectromètres X à base de tellurure de cadmium pour une gamme d'énergie s'étendant de 5 à 100 keV, en supposant une structure de compteur plane et un champ uniforme. Puis on a comparé les performances réelles de ces compteurs à celles calculées. Les écarts observés sont discutés

ПЕРВЫЙ РОССИЙСКИЙ КОНСЕНСУС ПО КОЛИЧЕСТВЕННОЙ ОЦЕНКЕ РЕЗУЛЬТАТОВ МЕДИЦИНСКИХ ВМЕШАТЕЛЬСТВ

The first Russian Consensus on the quantitative evaluation of treatment results was approved by the XIII National Congress of therapists (Moscow, November 21-23, 2018).Первый Российский консенсус по количественной оценке результатов медицинских вмешательств одобрен XIII Национальным конгрессом терапевтов (г. Москва, 21-23 ноября 2018 года)