We present an experimental study of the flow dynamics of a lamellar phase sheared in the Couette geometry. High-frequency ultrasonic pulses at 36 MHz are used to measure time-resolved velocity profiles. Oscillations of the viscosity occur in the vicinity of a shear-induced transition between a high-viscosity disordered fluid and a low-viscosity ordered fluid. The phase coexistence shows up as s...

A new photoelectric sensor capable of detecting tail pulses even in unheated rats was tested for accuracy in indirect measurements of blood pressure. This sensor proved more sensitive than a Doppler ultrasonic flowmeter because it allowed detection not only of tail pulsations without preheating but also of peak oscillations usable for estimating mean arterial pressure. After blood pressures in ...

The object of research is hard alloys with a morphology the carbide phase skeleton structure, in which particles contact each other, and gaps between them are filled binder phase. mechanical service characteristics such materials depend on degree development structure. One most problematic areas lack non-destructive methods for determining parameters introduction techniques will allow obtaining...

ultrasonic machining (usm) is a mechanical material removal process used to erode holes and cavities in hard or brittle work pieces by using shaped tools, high-frequency and an abrasive slurry. this paper addresses the concept and development of an expert system (es) for hard and brittle material, such as glass, quartz, diamond, carbides, semi conducting materials, ceramic and graphite which ca...

The ultrasonic relaxation of tellurite glasses xB2O3 – 70 TeO2 (30 x) WO3, 0 ≤ x 30 mol% was investigated by measuring the attenuation (αL) in these thermal range 140–300 K (T) at various frequencies (f). Some characteristics can be obtained from relation αL–T, such as average activation energy (Ep) and attempt frequency (f0). variables Ep f0 are a function B2O3 content. Moreover, αL–T accounts...

Overhead transmission lines are influenced by different factors which are mostly electrical and mechanical. These factors can cause problems for lines, distortions in network and outage of line. In designing transmission lines mechanical properties are evaluated after selecting a suitable conductor and clearance with regard to electrical properties. In lines designing, an important mechanical p...

The article describes the method of controlling recovered grade based on measuring intensity volume ultrasonic oscillations and Lamb waves covering a fixed distance through test medium metal plate contacting at various time points deliberate motion ground materials. The authors suggest determining density ore particles in pulp periodically after isolating flow vertical part vessel attenuation...

Alpha oscillations are ubiquitous in the brain, but their role in cortical processing remains a matter of debate. Recently, evidence has begun to accumulate in support of a role for alpha oscillations in attention selection and control. Here we first review evidence that 8-12 Hz oscillations in the brain have a general inhibitory role in cognitive processing, with an emphasis on their role in v...