СИНТЕЗ ЗАКОНУ КЕРУВАННЯ ЕЛЕКТРОПРИВОДОМ ВЕНТИЛЯТОРА ЗЕРНОКИДАЧА ДЛЯ ФОКУСУВАННЯ ЗЕРНОВОГО ПОТОКУ

The work considers the solution to the urgent problem of reloading grain into vehicles and reducing its damage. The possibility of throwing grain at a given range by creating an appropriate ballistic flight path by adjusting the speed of the electric drive of the belt when it is powered by a frequency converter is substantiated. The problem of reducing the focus of grain scattering by forming the flow of grain and controlling its movement not only when moving on the belt, but also after the separation of the flow and its movement in the air. Focusing of the lower layer is achieved by giving it an additional initial speed, which is provided by the air flow from the fan installed under the belt. For the frequency converter of the electric drive of the fan, in the form of a regression model, the control law which considers parameters of grain and necessary range of transportation is synthesized. Experiment planning theory was used to synthesize the control law.

Experimental Study on Flaw Response in Inhomogeneous Media

The objective of this paper is to predict the flaw response in an inhomogeneous solid medium. Multi-Gaussian Beam (MGB) model is used to represent the incident ultrasonic beam. The effect of ultrasonic attenuation and phase velocity dispersion due to grain scattering is included in the predictions. The effect of variation of mean diameter of the grains on the received voltage for different domain of interest is studied through the experimental results.

WFPC2 Studies of the Disk and Jet of HH 30

Hubble Space Telescope imaging of HH 30 has revealed this object to be a prototype young stellar object (YSO) accretion disk system. An optically thick circumstellar absorption disk, 450 AU in diameter, is seen extending perpendicular to highly collimated bipolar jets. The jet width is resolved in the transverse direction and increases with distance from the central star. The size and age of the disk compare well to the early solar nebula during planet formation. HH 30 is the first YSO disk ever observed at 14 AU resolution, and the first viewed close enough to edge-on that the vertical structure of the disk is clearly visible. These HST images of HH 30 offer the first-ever opportunity to directly measure the flaring profile of an astrophysical accretion disk. We have compared the images to model nebulosities calculated in both multiple and single scattering regimes, in the latter case via chi-squared minimization. This analysis constrains the circumstellar density distribution and grain scattering properties. A brief summary of the results is presented here; full details and references appear in Burrows et al., Ap.J. (1996).