Motion of Gas Bubbles and Rigid Particles in Vibrating Fluid-Filled Volumes

AbstractMotion of gas bubbles and rigid particles in an oscillating fluid is of fundamental interest for the theory of various widely used technological processes, in particular, for the flotation process. Therefore, many studies have been concerned with this problem, some of those being undertaken by eminent scientists. The main remarkable effects are heavy particles rising and light particles (gas bubbles) sinking in vibrating fluid's volume, and asynchronous self-induced vibration of emerging air cushion.In the authors’ recent papers, the problem has been solved by means of the concept of vibrational mechanics and the method of direct separation of motions; experimental studies have been also conducted. The present paper generalizes and supplements these studies. A special attention is given to the analysis of motion of bubbles and light rigid particles, whose sizes are small in comparison with the amplitude of external excitation; motion of larger (compressible) bubbles is also considered in the paper. It is shown that at certain parameters of external excitation such particles and bubbles will sink in the fluid, corresponding conditions are formulated

NSC KIPT Linux cluster for computing within the CMS physics program

The architecture of the NSC KIPT specialized Linux cluster constructed for carrying out work on CMS physics simulations and data processing is described. The configuration of the portable batch system (PBS) on the cluster is outlined. Capabilities of the cluster in its current configuration to perform CMS physics simulations are pointed out

Studies of the Response of the Prototype CMS Hadron Calorimeter, Including Magnetic Field Effects, to Pion, Electron, and Muon Beams

We report on the response of a prototype CMS hadron calorimeter module to charged particle beams of pions, muons, and electrons with momenta up to 375 GeV/c. The data were taken at the H2 and H4 beamlines at CERN in 1995 and 1996. The prototype sampling calorimeter used copper absorber plates and scintillator tiles with wavelength shifting fibers for readout. The effects of a magnetic field of up to 3 Tesla on the response of the calorimeter to muons, electrons, and pions are presented, and the effects of an upstream lead tungstate crystal electromagnetic calorimeter on the linearity and energy resolution of the combined calorimetric system to hadrons are evaluated. The results are compared with Monte Carlo simulations and are used to optimize the choice of total absorber depth, sampling frequency, and longitudinal readout segmentation.Comment: 89 pages, 41 figures, to be published in NIM, corresponding author: P de Barbaro, [email protected]

Шахтинский процесс 1928 г.: Подготовка, проведение, итоги. Кн. 1

2 tomesВ настоящее издание вошли документы, хранящиеся в Архиве Президента Российской Федерации, Архиве внешней политики Российской Федерации, Центральном архиве Федеральной службы безопасности Российской Федерации, Государственном архиве Российской Федерации, Российском государственном архиве экономики, Российском государственном архиве социально-политической истории, посвященные подготовке, организации и последствиям одного из основных судебных политических процессов советской эпохи -- над группой отечественных и немецких управленцев, инженеров и техников, обвиненных в "экономической контрреволюции в Донбассе". Во второй книге публикуются документы федеральных и ведомственных архивов по "Шахтинскому делу", отразившие технологическую сторону подготовки и осуществления внешнеполитических, репрессивных, судебных и других решений, связанных с данным процессом: материалы предварительного и судебного следствия, судебного заседания, документы, затрагивающие вопросы российско-германских отношений, сводки ОГПУ и партийно-государственных органов о настроениях представителей различных слоев общества в связи с Шахтинским процессом