The design of a simple electromechanical system which is dynamically equivalent to an active vibratory system is studied in this paper. A two-step process is presented in which a passive vibratory system is first obtained, which is then modified in the second step to achieve active equivalence. Implementation of the active emulation step is achieved by closedloop control of electromechanical sh...

The efficacy of thermoelastic stress analysis for use in the study of moderately curved gas turbine blades is considered over a frequency range of 68 Hz to 3.4 kHz. A selection of blades, both industrial examples and simplified planar laboratory specimens, are excited at their natural vibration frequencies using both electromagnetic shakers and piezoelectric stack actuators, in order to develop...

Heading toward the roundhouse after dark, I heard the powerful sound of people playing hosho (large maraca-like shakers) from some distance down the path. As I entered the dimly lit kitchen hut where the ceremony was being held, I could make out people clapping, singing, talking, and drinking; one frail old woman was dancing by herself in the center of the room. Beneath all of this there was st...

Drill cuttings are considered representative of the lithology being drilled in a wellbore. However, the fragments that are two to three times larger and/or having odd shapes compared to the regular cuttings are commonly understood as cavings from the wall of the borehole and they are seldom of any help in compilation of a lithology. In fact, cutting description manual recommends ignoring cuttin...

Vibratory technological equipment is widely used in various industries. The vast majority of existing vibratory machines are equipped by single- or double-mass oscillatory systems and inertial electromagnetic vibration exciters. novelty the present study consists development investigation three-mass system with crank excitation mechanism. Such a can be effectively implemented designs equipment,...

olive is a perennial evergreen tree which has good adaptability to poor environmental conditions such as salt and drought resistance. in recent years, there is a tendency to plant olive trees in green spaces. therefore, this study was carried out to evaluate 15 olive cultivars regarding growth habit, form, and texture to recommend for landscape. six-year-old trees of 15 olive cultivars, which h...

razzmatazz quackery hardly developed before the rapid expansion of commerce, advertising, communications and the press after the 1740s. Benes also shows that, at least up to the War of Independence, many of the showbiz-style quacks were paying brief visits to Europe, including the pioneer electro-therapist and sex-therapist, James Graham. In one final way, this volume documents the different co...