Results 61 to 70 of about 148,026 (279)
Plunger Motion Law of Downhole Oil Well Pump under the Condition of Flexible Control
Shiyou jixie, 2022 The flexible control technology of beam pumping system is a kind of variable-speed drive technology.Its purpose is to change the working process of pumping unit and improve the efficiency of oil production,so it is somewhat advanced.However,the previous ...
Duan Zhigang +6 more
doaj
High Charge Carrier Mobility in Non‐Conjugated 3D Covalent Organic Frameworks
Advanced Materials, EarlyView.A non‐conjugated 3D COF constructed via boronate ester linkages from tetraphenylene and pyrene‐based monomers is reported, which exhibits a high charge carrier mobility of 14 ± 1 cm2 V−1 s−1. ABSTRACT π‐Conjugation, π–π stacking, and long‐range order play a central role in determining charge transport efficiency in organic materials.
Joaquín Almarza +11 more
wiley +1 more source
Advanced Materials, EarlyView.Inspired by viral entry mechanisms, the FUSION assay enables autonomous detection of respiratory viruses via membrane fusion–triggered CRISPR‐Cas13a activation. VEACON selectively fuses with fusion‐competent viruses, triggering fluorescence within confined vesicles.
Jae Chul Park +15 more
wiley +1 more source
Cryopump behavior in the presence of beam or nuclear radiation [PDF]
, 1977 Cryocondensation pumping has been proposed to be the method of gas removal for neutral-beam refueled fusion reactors. A cryocondensation pumping unit has been constructed to test design concepts and compatibility with conditions under actual beam ...
Law, P.K., P.K. Law, Law, P. K.
core +1 more source
All‐Optical Reconfigurable Physical Unclonable Function for Sustainable Security
Advanced Materials, EarlyView.An all‐optical reconfigurable physical unclonable function (PUF) is demonstrated using plasmonic coupling–induced sintering of optically trapped gold nanoparticles, where Brownian motion serves as a robust entropy source. The resulting optical PUF exhibits high encoding density, strong resistance to modeling attacks, and practical authentication ...
Jang‐Kyun Kwak +4 more
wiley +1 more source
Design of Beam Pumping Unit Drive
, 2015 Bakalářská práce je zaměřena na návrh pohonu pro vahadlový čerpací stroj. V úvodu práce je popsán současný stav problematiky vahadlových čerpacích strojů a jejich pohonů.
Ašenbrener Jiří
core
Analysis of fatigue crack growth and estimation of residual life of the walking beam of an oilfield pumping unit [PDF]
, 2010 An analysis of the fatigue crack growth and the corresponding residual life evaluation of the walking beam of an oilfield pumping unit are presented. Lifting lugs had been welded on the upper flange of the walking beam at the moment of assembling the ...
Larrainzar, Cesar +2 more
core +1 more source
Kinematic Analysis of Long Stroke Pumping Unit with Post Pulley
Jixie chuandong, 2017 In view of the shortcomings of high peak of crank torque and polished rod load,short stroke and serious wear of steel wire rope,the structural characteristics of the conventional beam pumping unit are analyzed.
Sun Wenbin +3 more
doaj
Advanced Materials, EarlyView.A thermally adaptive plasmonic metasurface, functionalized with poly(N‐isopropylacrylamide) (PNIPAM) and anti‐CD63 antibodies, enables precise, on‐demand capture and release of extracellular vesicles (EVs). Delivering high recovery, improved purity, and intact vesicle structure, the platform offers a versatile, label‐free solution for real‐time EV ...
Beyza Nur Kucuk +7 more
wiley +1 more source
Research on the Pumping Unit Model Driven by Linear Motor
, 2011 With superior performances, Linear motor driven pumping unit becomes the electrical control of the focus and emphasis of the recent oil field equipment. Against the beam pumping unit motor efficiency, low power factor and stoke that difficult to regulate,
De Bao Tian +4 more
core +1 more source