Results 251 to 260 of about 71,707 (286)
Some of the next articles are maybe not open access.
Differential pumping unit for windowless coupling of laser beams to ultra high vacuum
Vacuum, 2020Abstract Current laser technology enables table-top high flux XUV sources with photon energies from several tens to several hundreds of eV via high harmonic generation in noble gases. Here we present a compact versatile coupling unit to establish windowless, and thus lossless coupling of such light sources to ultra high vacuum (UHV).
Maxim Tschernajew +7 more
openaire +1 more source
Analysis of a Disc-type Permanent Linear Motor for Beam Pumping Unit
INTERMAG 2006 - IEEE International Magnetics Conference, 2006In this work, a prototype beam pumping unit driven by two DPLSMs was made and analyzed. It was found that the system can supply high torque when operating under very low speed; the temperature is low after a long time operation. It is also shown that the loss is small and the cool condition is good.
Q. Lu, C. Fan, Y. Ye, Z. Zhu
openaire +1 more source
3D Virtual Simulation of Beam Pumping Unit Motion Based on Inverse Kinematic
Applied Mechanics and Materials, 2012The movement of beam pumping unit is a kind of involute moment. The exiting virtual reality engines provide translation, rotation and zooming, which belong to the category of the forward kinematics. It is difficult to simulate the beam pumping unit movement based on forward kinematics.
Fang Liu, Xian Mei Liu
openaire +1 more source
Dynamic Adjusting Mechanism of Counterbalance in Beam-Pumping Unit and its Kinetic Analysis
Applied Mechanics and Materials, 2013The purpose of conventional counterbalance mechanism featuring a fixed counterbalance torque is to balance the nonuniformity of polished rod load. Therefore, it cannot satisfy the demand of polish rod load which changes with well-condition and then leads to increase of power cost for decreasing quality of balance.
Xiao Qing Kang, Tao Ren, Wen Tao Qu
openaire +1 more source
Energy-Saving Control System of Beam-Pumping Unit Based on Wavelet Neural Network
2008 Fourth International Conference on Natural Computation, 2008The energy saving process for beam-pumping unit is a complicated and nonlinear system, and it is very difficult to found the process model to describe it. The wavelet neural network has the ability of strong nonlinear function approach, adaptive learning, fast convergence and global optimization.
Jingwen Tian +3 more
openaire +1 more source
Modal Analysis for the Framework of Beam Pumping Unit Based on Solidworks Simulation
Applied Mechanics and Materials, 2013The framework is the main load bearing part of beam pumping unit. Its vibration performance has an important effect on the stability and reliability of beam pumping unit. This article takes the beam pumping unit (API C-228D-173-74) as an example, carries out the modal analysis in the environment of Solidworks Simulation, and obtains the first 6 orders ...
Qiang Wang, Jian Fu Xiao
openaire +1 more source
The Research on Modular and Parametric Design System for Beam Pumping Unit
Applied Mechanics and Materials, 2011This paper presents the idea that is the combination of beam pumping unit modular and parametric design by domestic beam pumping unit modular design research status. Based on functional approach, it collects the main structural characteristics parameters of serial module divided and does the parametric design.
openaire +1 more source
Decision Parameter Optimization of Beam Pumping Unit Based on BP Networks Model
2013Beam pumping unit is the most popular oil recovery equipment. One of the most common problems of beam pumping unit is its high energy consumption due to its low system efficiency. The main objective of this study is modeling and optimization a beam pumping unit using Artificial Neural Network (ANN).
Xiao-hua Gu +4 more
openaire +1 more source
Critical care management of chimeric antigen receptor T‐cell therapy recipients
Ca-A Cancer Journal for Clinicians, 2022Alexander Shimabukuro-Vornhagen +2 more
exaly