Results 61 to 70 of about 5,119,526 (356)

Modelling of deep wells thermal modes [PDF]

open access: yes, 2019
Purpose. Investigation of various heat-exchange conditions influence of the tower liquid on the deep wells thermal conditions. Methods. Methods of heat-exchange processes mathematical modeling are used.
Blyuss, B   +4 more
core   +1 more source

Enhancing Direct Solar Water Splitting via ALD of Multifunctional TiO2/Pt Nanoparticle Coatings With Engineered Interfaces to GaAs/GaInP Tandem Cells

open access: yesAdvanced Functional Materials, EarlyView.
Multifunctional atomic layer deposited coatings and interface treatments enhance direct solar water splitting on GaAs/GaInP tandem cells. Optimized TiO2/Pt nanoparticle bilayers ensure durability and catalytic efficiency with minimal optical losses, while H2 plasma pretreatments maximize photovoltage and interfacial charge extraction.
Tim F. Rieth   +8 more
wiley   +1 more source

Impact of Cutting Carrying Index Optimization on Hole Cleaning Efficiency: A Case Study of a Middle Eastern Oil Field

open access: yesEnergy Science & Engineering
Effective hole cleaning is essential to drilling success, with poor cuttings transport leading to reduced penetration rates, stuck pipe, and increased non‐productive time.
Mohammad Ramyar   +3 more
doaj   +1 more source

A Similarity-Based Prognostics Approach for Remaining Useful Life Prediction [PDF]

open access: yes, 2014
Physics-based and data-driven models are the two major prognostic approaches in the literature with their own advantages and disadvantages. This paper presents a similarity-based data-driven prognostic methodology and efficiency analysis study on ...
Camci, Faith   +2 more
core   +1 more source

Prospects of Electric Field Control in Perpendicular Magnetic Tunnel Junctions and Emerging 2D Spintronics for Ultralow Energy Memory and Logic Devices

open access: yesAdvanced Functional Materials, EarlyView.
Electric control of magnetic tunnel junctions offers a path to drastically reduce the energy requirements of the device. Electric field control of magnetization can be realized in a multitude of ways. These mechanisms can be integrated into existing spintronic devices to further reduce the operational energy.
Will Echtenkamp   +7 more
wiley   +1 more source

Unconventional gas: potential energy market impacts in the European Union [PDF]

open access: yes, 2012
In the interest of effective policymaking, this report seeks to clarify certain controversies and identify key gaps in the evidence-base relating to unconventional gas.
ALECU Corina   +11 more
core   +1 more source

Understanding Decoherence of the Boron Vacancy Center in Hexagonal Boron Nitride

open access: yesAdvanced Functional Materials, EarlyView.
State‐of‐the‐art computations unravel the intricate decoherence dynamics of the boron vacancy center in hexagonal boron nitride across magnetic fields from 0 to 3 T. Five distinct regimes emerge, dominated by nuclear spin interactions, revealing optimal coherence times of 1–20 µs in the 180–350 mT range for isotopically pure samples.
András Tárkányi, Viktor Ivády
wiley   +1 more source

Study on Construction Technology of Rock-socketed Pile Group for Offshore Wind Turbine Generators

open access: yesRenmin Zhujiang, 2020
This paper simulates and analyzes the driveability of steel pipe pile under complex geological conditions by the GRLWEAP software,and studies the construction technology of integrated rock-socketed pile group based on the statistical analysis of the ...
CHENG Zishuo
doaj  

Displacement Efficiency of Cementing in Eccentric Annulus with Small Clearance

open access: yesShiyou jixie, 2022
In the process of cementing in a small annular clearance,if the casing is eccentric seriously,drilling fluid might be detained in the narrow clearance of the annulus generally besides retention on both walls of the annulus.In order to improve the ...
Ma Yue   +5 more
doaj  

Aspects of energy requirements for rock drilling [PDF]

open access: yes, 1974
Development of laboratory rock breakage techniques to relate energy and surface area produced by slow compression, drop hammer and stamp mill. A detailed study of laboratory rotary-percussive drilling in a wide range of rocks under different ...
Wootton, David
core  

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