Results 31 to 40 of about 333 (189)
Embedded Drilling System using Rotary-percussion Drilling [PDF]
, 2017 The drilling technology is widely used in various fields. This technology has been developed explosively by large companies. However, conventional drilling system requires large equipment such as a rig and mud systems.
Kim, Jinkwang +2 more
core
Flow structure and rock-breaking feature of the self-rotating nozzle for radial jet drilling
Petroleum Science, 2019 For improving the hole-enlarging capability, roundness and rock-breaking efficiency of the nozzle in radial jet drilling, a new structure of self-rotating nozzle was put forward.
Hua-Lin Liao +5 more
doaj +1 more source
Boreas, EarlyView.The Palaeolithic site of Ochtmissen (Lower Saxony, Germany) was excavated in fluvial terrace deposits during the winter of 1993/1994. The current study presents, for the first time, a thorough analysis of the lithic assemblage, encompassing its primary technological and typological characteristics, as well as the type and age of the fluvial deposits ...
Gianpiero Di Maida +4 more
wiley +1 more source
Rotary percussion method in drilling of borehole heat exchangers [PDF]
, 2015 Artykuł zawiera opis udarowo-obrotowej metody wiercenia. Wykorzystuje się ją z coraz większym powodzeniem przy różnego rodzaju wierceniach. Jednym z ważnych zastosowań jest wykonywanie otworowych wymienników ciepła.The article contains a description of ...
Śliwa, T., Topczewska, K., Klepczyk, K.
core
Impact Dynamics of a Percussive System Based on Rotary-Percussive Ultrasonic Drill [PDF]
Shock and Vibration, 2017 This paper presents an impact dynamic analysis of a percussive system based on rotary-percussive ultrasonic drill (RPUD). The RPUD employs vibrations on two sides of one single piezoelectric stack to achieve rotary-percussive motion, which improves drilling efficiency.
Yinchao Wang +5 more
openaire +2 more sources
Land Degradation &Development, Volume 37, Issue 13, Page 9114-9125, 15 August 2026.ABSTRACT Salt affected soils are common worldwide, resulting from natural causes and anthropogenic activities. Saline and sodic soils often occur in association with oil and gas production, impacting soil properties which can impede vegetation growth and development.
Laura Bony +3 more
wiley +1 more source
Optimal drilling parameters during rotary percussion drilling and simultaneous casing of borehole [PDF]
, 2020 Udarno rotacijska metoda vrtanja se pogosto uporablja za vrtanje plitvejših vrtin, ki se v največji meri uporabljajo kot inklinometri, piezometri, vodnjaki ali geosonde, njihova globina pa običajno ne presega 250 m.
Bajuk, Simon
core +1 more source
Percussion-rotary method of drilling large-diameter dewatering wells in ‘Bełchatów’ liginte mine [PDF]
, 2016 Lignite opencast extraction can be performed after prior dewatering of the rock mass. Most frequently it is realized with large-diameter dewatering wells which have been mostly drilled with the invert mud rotary method and airlift. This method allows for
Kaczmarek, T., Macuda, J., Gasiński, J.
core +1 more source
Study on Construction Technology of Rock-socketed Pile Group for Offshore Wind Turbine Generators
Renmin 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
The Sanitization of the Night: Gentrification and the Everyday Temporal Politics in Belgrade
City &Society, Volume 38, Issue 2, August 2026.ABSTRACT Urban scholarship increasingly recognizes that processes such as gentrification unfold not only through spatial transformations, but through shifts in sensory environments and everyday rhythms. In this paper, drawing on twenty‐three months of fieldwork in Belgrade, I examine how urban redevelopment (re)organizes time for middle‐class people ...
Alexandra Dantzer
wiley +1 more source