Results 11 to 20 of about 10,264,975 (267)

Surface characteristics analysis of fractures induced by supercritical CO2 and water through three-dimensional scanning and scanning electron micrography

open access: yesJournal of Rock Mechanics and Geotechnical Engineering, 2021
Morphology of hydraulic fracture surface has significant effects on oil and gas flow, proppant migration and fracture closure, which plays an important role in oil and gas fracturing stimulation.
Hao Chen   +6 more
doaj   +1 more source

Rock breaking performance of the newly proposed unsubmerged cavitating abrasive waterjet

open access: yesInternational Journal of Mining Science and Technology, 2023
To improve the rock breaking ability, cavitating waterjet and abrasive waterjet are combined by using a coaxial low-speed waterjet generated around the periphery of a high-speed abrasive waterjet, and a new type of waterjet called unsubmerged cavitating ...
Chenxing Fan   +4 more
doaj   +1 more source

An Alternate Representation of the Vector of Apparent Power and Unbalanced Power in Three-Phase Electrical Systems

open access: yesApplied Sciences, 2020
Low-voltage distribution systems are typically unbalanced. These inefficiencies cause unbalanced powers that can significantly increase the apparent power of the system.
Pedro A. Blasco   +3 more
doaj   +1 more source

Comparative Analysis of the Clustering Quality in Self-Organizing Maps for Human Posture Classification

open access: yesSensors, 2023
The objective of this article is to develop a methodology for selecting the appropriate number of clusters to group and identify human postures using neural networks with unsupervised self-organizing maps. Although unsupervised clustering algorithms have
Lisiane Esther Ekemeyong Awong   +1 more
doaj   +1 more source

1996 Wholesale Power and Transmission Rate Schedules. [PDF]

open access: yes, 1996
Bonneville Power Administration`s (BPA) 1996 Wholesale Power Rate Schedules, 1996 Ancillary Products and Services Rate Schedule, 1996 Transmission Rate Schedules, and General Rate Schedule Provisions, contained herein, were approved on an interim basis ...
United States. Bonneville Power Administration.
core   +1 more source

The cylindrical surface characteristics of AA7075 aluminum alloy machined by abrasive waterjet with circular cuts

open access: yesJournal of Materials Research and Technology, 2023
Abrasive waterjet (AWJ) is an untraditional machining tool that has been used in numerous applications. This study aims at clarifying the cylindrical surface characteristics machined by AWJ under different radii (Rc) of circular cuts.
Yi'nan Qian   +5 more
doaj   +1 more source

Living and Working Safely Around High-Voltage Power Lines. [PDF]

open access: yes, 1998
High-voltage transmission lines can be just as safe as the electrical wiring in the homes--or just as dangerous. The crucial factor is ourselves: they must learn to behave safely around them.
United States. Bonneville Power Administration.
core   +1 more source

The thermal behaviour of a special heat exchanger filled with the phase change material dedicated for low – temperature storage applications [PDF]

open access: yesEPJ Web of Conferences, 2019
The work deals with an experimental and theoretical analysis of a special heat exchanger filled with the PCM (Phase Change Material) mixture of paraffin wax capsuled in the melamine-formaldehyde membrane and water, dedicated to low-temperature storage ...
Ochman Agnieszka, Pietrowicz Sławomir
doaj   +1 more source

Removal of field-collected Microcystis aeruginosa in pilot-scale by a jet pump cavitation reactor

open access: yesUltrasonics Sonochemistry, 2022
Hydrodynamic cavitation has been investigated extensively in the field of water treatment in the last decade and a well-designed hydrodynamic cavitation reactor is critical to the efficient removal of algal and large-scale application.
Shuangjie Xu   +6 more
doaj   +1 more source

“Standard Text” Relational Classification Model Based on Concatenated Word Vector Attention and Feature Concatenation

open access: yesApplied Sciences, 2023
The task of relation classification is an important pre-task in natural language processing tasks. Relation classification can provide a high-quality corpus for tasks such as machine translation, human–computer dialogue, and structured text generation ...
Xize Liu   +4 more
doaj   +1 more source

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