Results 61 to 70 of about 399,144 (328)

Investigation of the Reduction in Distributed Acoustic Sensing Signal Due to Perforation Erosion by Using CFD Acoustic Simulation and Lighthill’s Acoustic Power Law

open access: yesSensors
Distributed Acoustic Sensing (DAS), widely adopted in hydraulic fracturing monitoring, continuously measures sound from perforation holes due to fluid flow through the perforation holes during fracturing treatment.
Yasuyuki Hamanaka, Ding Zhu, A. D. Hill
doaj   +1 more source

Practices and prospect of petroleum engineering technologies in ultra-deep sour gas reservoirs, Yuanba Gasfield, Sichuan Basin

open access: yesNatural Gas Industry B, 2016
Located in the Sichuan Basin, the Yuanba Gasfield is the deepest marine sour gas field among those developed in China so far. Its biohermal gas reservoir of the Upper Permian Changxing Fm is characterized by ultra depth, high content of hydrogen sulfide,
Jin Xu
doaj   +1 more source

Global and Regional Temporal Changes in Cross‐Country Inequalities of Site‐Specific Osteoarthritis Burden, 1990 to 2021

open access: yesArthritis Care &Research, EarlyView.
Objective This study examined the global and regional temporal changes in cross‐country inequalities of site‐specific osteoarthritis (OA) burden from 1990 to 2021. Methods Age‐standardized years lived with disability rates (ASYRs) for site‐specific OA across 204 countries and territories were obtained from the Global Burden of Diseases, Injuries, and ...
Haowei Chen   +14 more
wiley   +1 more source

Evaluating Fluid Distribution by Distributed Acoustic Sensing (DAS) with Perforation Erosion Effect

open access: yesSensors
Among the various completion strategies used in multi-stage hydraulic fracturing of horizontal wells, the limited entry design has become one of the most common approaches to promote more uniform slurry distribution.
Daichi Oshikata, Ding Zhu, A. D. Hill
doaj   +1 more source

Stress corrosion behavior of X80 pipeline steel in the natural seawater with different dissolved oxygen contents

open access: yesFracture and Structural Integrity, 2019
Stress corrosion slow strain rate tensile tests of the X80 steel in the natural seawater are carried out to study the effect of dissolved oxygen (DO) on the sensitivity of stress corrosion.
Zhong-ying Han   +1 more
doaj   +1 more source

Earth science education in South Australia: Evolving with the resources boom [PDF]

open access: yes, 2007
Copyright © 2007 AusIMM The document attached has been archived with permission from the publisher.Andreas Schmidt Mumm MAusIMM and Alan Collins, Geology and Geophysics, School of Earth and Environmental Sciences, The University of Adelaidehttp://direct ...
Collins, A., Schmidt Mumm, A.
core   +1 more source

Endpoint Mobility Ratios for Vertical and Horizontal Wells with Incidence of Scale Deposition [PDF]

open access: yes, 2009
One of the most difficult and profit hurting problems found in the oil field is the build-up of scale deposits in the well bore, production string, flow lines and even in storage tanks.
Bamidele, A. O.   +2 more
core   +1 more source

Removing Homocoupling Defects in Alkoxy/Alkyl‐PBTTT Enhances Polymer:Fullerene Co‐Crystal Formation and Stability

open access: yesAdvanced Functional Materials, EarlyView.
PBTTT‐OR‐R, a C14‐alkoxy/alkyl‐PBTTT polymer derivative, is of substantial interest for optoelectronics due to its specific fullerene intercalation behavior and enhanced charge‐transfer absorption. Comparing this polymer with (S) and without (O) homocoupling defects reveals that PBTTT‐OR‐R(O) forms stable co‐crystals with PC61BM, while PBTTT‐OR‐R(S ...
Zhen Liu   +14 more
wiley   +1 more source

MODEL OF COMPLEX ASSESSMENT OF THE EFFICIENCY OF PARTNER NETWORK STRUCTURE FUNCTIONING

open access: yesМодели, системы, сети в экономике, технике, природе и обществе
Background. A network structure is an organisational form where enterprises are networked together to share information, resources and expertise, thereby improving production efficiency and product competitiveness. In such a structure, each enterprise
S.V. Frolova, E.M. Deberdieva
doaj   +1 more source

Geologists of Russian origin in Latin America [PDF]

open access: yes, 2018
Se describe la vida y trayectoria de geólogos que más allá de su nacionalidad (rusa, ucraniana, tártara, alemana, etc.), nacieron en territorios que pertenecieron al Imperio Ruso, la Unión Soviética o la Federación Rusa, y de sus descendientes graduados ...
Alonso, Ricardo   +7 more
core   +1 more source

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