This scientific article is about the research stability of mast rope-pin drive downhole sucker-rod pump. The design pump in form a mast, which mounted directly on column wellhead has been proposed. Calculations frequency natural vibrations system from rotation cranks during breakage rods are performed, completely eliminates possibility resonant phenomena that destroy mast. proves high margin. K...

Motivated by the measurement of redshifted Fe Hα lines during type I X-ray bursts on EXO 0748-676 (Cottam, Paerels & Mendez), we study the formation of atomic Fe lines above the photosphere of a bursting neutron star (kBTeff ≈ 1 − 2 keV). We discuss the effects of Stark broadening, resonant scattering and NLTE (level population) on the formation of hydrogenic Fe Hα, Lyα and Pα lines. From the o...

In the present work, we have studied the performance of an open compression chamber with compressed air and driven by an oscillating water column. Recognizing the existence of a free-surface for the water column, the interface position between the trapped-air and water volume -together with the motion of the column-, is described by a non-linear energy equation that reflects the main dynamic ch...

the resonant frequency and sensitivity of an atomic force microscope (afm) cantilever with assembled cantilever probe (acp) have been analyzed and a closed-form expression for the sensitivity of vibration modes has been obtained. the proposed acp comprises an inclined cantilever and extension, and a tip located at the free end of the extension, which makes the afm capable of topography at sidew...

use of appropriate leadership style to improve organizational commitment is among the major duties of managers. in order to achieve this goal, resonant leaders, in harmony with the other members, use a high level of emotional intelligence. the purpose of this study is to identify the resonant leadership's effect on the organizational commitment, with the mediating role of trust in the senior ma...

The first unambiguous measurements of a bounce-resonance effect in a non-neutral plasma are presented. Two striking signatures are observed when a magnetized electron column is heated by oscillating an end sheath. First, the heating rate increases by a factor of 104 as the oscillation frequency is increased by a factor of 10 near the thermal electron bounce frequency. Second, the heating is enh...

On the basis of observations of arterial pulse forms in anesthetized dogs, a hypothesis is developed to account for the genesis of the aortic standing wave which is responsible for the dicrotic characteristics of pulses recorded from the abdominal-femoral system. A sudden lowering of resistance to pulse wave propagation in the region of the diaphragm and an increase in resistance in the periphe...

In design of a parallel resonant induction heating system, choosing a proper capacitancefor the resonant circuit is quite important. The capacitance affects the resonant frequency, outputpower, Q-factor, heating efficiency and power factor. In this paper, the role of equivalent seriesresistance (ESR) in the choice of capacitance is significantly recognized. Optimal value of resonancecapacitor i...