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...

Excessive vibration of turbomachinery blades causes high cycle fatigue (HCF) problems requiring damping treatments to mitigate vibration levels. Based on the technical challenges and requirements learned from previous turbomachinery blade research, a feasibility study of resonant damping control using shunted piezoelectric patches with passive and active control techniques has been conducted on...

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...

This paper presents the design, optimization and manufacturing of a novel micro-fabricated load cell based on a double-ended tuning fork. The device geometry and operating voltages are optimized for maximum force resolution and range, subject to a number of manufacturing and electromechanical constraints. All optimizations are enabled by analytical modeling (verified by selected finite elements...

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...