Results 91 to 100 of about 764,279 (193)

Rock Drill

open access: yes, 1903
Patent for a rock drill.
Higgins, Pattillo
core  

Rheumatology Informatics System for Effectiveness (RISE) Registry Participation Associated with Significant Gains in Quality Measure Performance: An Interrupted Time Series Analysis

open access: yesArthritis &Rheumatology, Accepted Article.
Objective To examine the association between participation in a qualified clinical data registry and quality measure performance. Methods We included practices that joined the American College of Rheumatology's Rheumatology Informatics System for Effectiveness (RISE) registry between 2015 – 2021.
Gabriela Schmajuk   +5 more
wiley   +1 more source

Numerical simulation of bottomhole flow field of PDC bit in horizontal well

open access: yesJin'gangshi yu moliao moju gongcheng
Objectives: Horizontal wells can effectively improve the economic benefits of shale oil and gas development. However, as the horizontal section extends, the rock debris transport efficiency of the PDC drill bit gradually decreases, which can lead to bit ...
Sai LI   +4 more
doaj   +3 more sources

Top Hammer Drill Simulation in Varying Rock Conditions

open access: yes, 2020
Rock breaking using a top hammer drill is achieved with a combination of four distinct hydraulically driven functions; percussion, feed, rotation and flushing the hole. Percussion, feed and rotation are applied to the drill string outside the drill hole.
Mattila, Jouni   +3 more
core  

Cory House 027: Drill Holes in Rock

open access: yes, 2021
A large worked rock in one of the pastures containing flat, slot drill and wedge marks. The Criteria Statement documentation notes that this type of drill work predates the plug drill and is presently dated to between 1760 to to1830.https://docs.rwu.edu ...

core   +1 more source

MECHANICAL ANALYSIS OF THE DRILL BIT IN THE DUAL CASING SIDETRACKING

open access: yesJixie qiangdu, 2016
In the dual casing sidetracking,the oil casing wall,cement ring,technical casing wall and rock formations’ hardness are different,furthermore,in the process of dual casing sidetracking the bit in contact with the oil casing wall,cement ring,technical ...
KONG ChunYan, LIANG Zheng, ZHANG DeRong
doaj  

String Figuring young children's perspectives of quality in English early childhood education and care

open access: yesBritish Educational Research Journal, EarlyView.
Abstract Quality in early childhood education and care (ECEC) is a contested concept and has generally been conceptualised by inter‐related indicators such as staff qualifications, educational environment, policy or child‐to‐staff ratios. There has been a more limited emphasis on how young children might perceive and experience quality.
Nikki Fairchild, Éva Mikuska
wiley   +1 more source

UA Little Rock Seminar in Public History (HIST 7391) files on the Greater Little Rock Chamber of Commerce, 1999

open access: yes, 1999
This collection contains the project report, interview transcripts, and audiocassette tapes from the University of Arkansas at Little Rock's Seminar in Public History's 1999 project, "Accomplishing Things Most People Think Just Happen: A History of the ...
University of Arkansas at Little Rock. Department of History.
core  

Listening to Hong Kong children's perspectives through pretend play

open access: yesBritish Educational Research Journal, EarlyView.
Abstract Quality in early childhood education and care (ECEC) has become an increasing concern in recent years. The issue has been regularly discussed by different stakeholders. However, the rising concern regarding quality in ECEC has not seriously taken into account children's perspectives.
Suzannie K. Y. Leung
wiley   +1 more source

Cooperative learning strategies to raise attainment in mathematics with pupils aged 11–16 years: A systematic literature review

open access: yesBritish Educational Research Journal, EarlyView.
Abstract Cooperative learning is a widely adopted teaching method to improve academic achievement. This review synthesises existing research on the use of cooperative learning within a school setting for pupils aged 11–16 years. Such a review has not been undertaken to date and will present an evidence base for educators considering implementation ...
Patricia Hampson   +2 more
wiley   +1 more source

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