Effects of vortices on diffusion and heat transfer

The unusual phenomenon observed by D.I. Taylor and other researchers was explained. During the vortex motion of the liquid, the distributed component of the diffusing substance is concentrated only in the vortex core. The effect was explained in terms of our hypothesis that takes into account the dependence of the diffusing substance flow not only on the concentration gradients, but also on the vorticity of the liquid. The concept offers a new glimpse on natural and technical effects such as the tornado and the Ranque effect.     

Conveyor and cabinet drying of materials using a functional ceramic

The current problem of conveyor and cabinet drying of various materials is considered. Radiation infrared drying using nonlinear infrared radiation (IR) transducers based on a functional ceramic is studied. Use of IR of a special spectral composition and structure makes it possible to shorten processing duration considerably, to improve product quality, to simplify the design layout, and also to create conditions for mechanizing and automating production. __________ Translated from Khimicheskoe i Neftegazovoe Mashinostroenie, No. 4, pp. 24–25, April 2007.     

Influence of the Cross-Sectional Shape of Hot Semifinished Rolled Products on the Formation of the Plot of Specific Tension in Cold-Rolled Strips

Metallurgist - In view of the increasing competition in the market of rolled products, the problem of evaluation of the quality of strips in various stages of the process of rolling seems to be...     

Time domain simulation of Fourier imaging by summation of isochromats

We have developed a time-domain simulation of two-dimensional Fourier imaging in which the signal is represented by a finite Fourier series. Each term corresponds to a spin isochromat and has a coefficient that evolves in response to radiofrequency and gradient pulses, and periods of free precession. An explicit calculation is performed to derive the number of isochromats required to achieve a specified degree of precision, permitting accurate results to be obtained in an efficient fashion. With this, the time-domain signal throughout the entire experiment is calculated. The resulting time domain data is combined into the standard k -space matrix and yields an image after two-dimensional Fourier transformation. Multiple-shot sequences such as spin warp and single-shot experiments such as Burst are simulated in the same fashion. Our procedure makes no assumptions about transverse dephasing between pulses, so that complicated sequences of direct and stimulated echoes are correctly modeled. The influence of spin-spin and spin-lattice relaxation is included in a natural way. A number of artifacts can be quantitatively reproduced. © 1997 John Wiley & Sons, Inc. Int J Imaging Syst Technol, 8, 419–426, 1997     

Epidemiologic features of hospital pyo-septic infection in a cardiosurgical hospital

The results of the epidemiological analysis of morbidity in purulent septic infection in a cardiosurgical hospital during the period of 1990-1963 is presented. As revealed by this analysis, until 1993 the dominating causative agent of this infection was Pseudomonas aeruginosa O16, and since 1994 Staphylococcus epidermidis prevailed. The morbidity dynamics for several years and during individual years is shown. The main risk factors were established. The reanimation department was found to be the main areas where the contamination of patients occurred.     

Improving the Efficiency of the PPM Algorithm

For the PPM algorithm, we suggest new definitions of generalized frequencies of characters and escapes. This considerably increases the efficiency of lossless coding (compression) for various types of real-world discrete data.