Results 51 to 60 of about 168,341 (157)

Experimental study on high-pressure hydraulic percussive rotary drilling based on single-tooth rock-breaking process

, 2022
Aiming at the problem of low efficiency of hard rock drilling in crossing borehole in underground coal mine, the morphology of crushing pit formed by column tooth under the percussive load was analyzed based on the percussive rotary drilling mechanism ...
Hongchao, WEI, Kai, ZHANG, Xiushan, LI, Li, WANG, Xuqian, DOU, Ningping, YAO   +5 more
core   +1 more source

Penetration Characteristics of a Rock Drill Bit into Rock

Journal of MMIJ
Percussion rock drills have been widely used mainly for blast hole drilling in mineral extraction, tunnel excavation, and underground development.
Kimihiro HASHIBA, Katsunori FUKUI
doaj   +1 more source

Early Bronze Age Copper Circulation in the Guadalentín and Segura Valleys (SE Spain)

Archaeometry, Volume 68, Issue 5, Page 1139-1151, October 2026.
ABSTRACT Identifying the sources of copper used in Early Bronze Age metalwork from south‐east Spain is key to resolving a long‐running debate concerning centralized control, or lack thereof, over El Argar society's economic organisation. This study provides the first substantial integrated programme of EDXRF and MC‐ICP‐MS analyses for copper‐base ...
Dirk Brandherm, Ignacio Montero‐Ruiz
wiley   +1 more source

Drilling Processes with Hydraulic Percussion Rock Drills

Journal of MMIJ, 2017
Rock drills were developed about two hundred years ago, and hydraulic percussion rock drills are about half-century old. Performance and efficiency of rock drills have been increased by a number of researchers and engineers.
Kimihiro HASHIBA, Katsunori FUKUI, Masahiro KOIZUMI   +2 more
doaj   +1 more source

Integrating Acoustic Telemetry and Stable Isotope Data Reveals Overlap in Resource Use by Large‐Bodied Fishes in a Temperate Lake

Ecology of Freshwater Fish, Volume 35, Issue 4, October 2026.
ABSTRACT Temperate lake ecosystems undergo seasonal shifts that disproportionately alter the availability of suitable habitat for fishes of different thermal guilds. While many studies have investigated fish habitat use patterns, few have estimated the degree to which fish species overlap in space across seasons from a three‐dimensional perspective ...
Ian A. Richter, Alyssa M. Andersen, Karen E. Smokorowski, Paul J. Blanchfield   +3 more
wiley   +1 more source

Wood wasp inspired space and earth drill [PDF]

, 2010
In this chapter, we explain why the low gravity encountered on Mars or on the Moon and the low mass of the probes, landers and rovers that carry drilling devices limit classical drilling techniques.
Gao, Y, Coste, P, Gourinat, Yves, Gao, Yang, Gourinat, Y, Gouache, Thibault, Gouache, T, Coste, Pierre   +7 more
core  

A Piezoelectric-Driven Rock-Drilling Device for Extraterrestrial Subsurface Exploration

Shock and Vibration, 2018
The rocks on extraterrestrial objects contain plenty of original geological and biological information. Drilling and sampling are an essential task in lunar exploration or future explorations of other planets like mars. Due to the limitation of payloads,
He Li, Yi Shen, Qingchuan Wang, Yinchao Wang, Deen Bai, Zongquan Deng   +5 more
doaj   +1 more source

Synergistic Effect of Gradient Conductivity and Gradient Microstructures Enabled Ultrasensitive and Ultrabroad Linear Flexible Tactile Sensors

Advanced Science, Volume 13, Issue 51, 14 September 2026.
A design of double gradient effect is proposed to resolve the contradictory optimization on sensitivity and linearity of piezoresistive tactile sensors. The ultrawide linearity is realized by the sequential trigger of pressure‐induced gradient conductivity‐enabled linear current owing to the gradient microstructures.
Yao Fang, Yiwei Wang, Bing Zheng, Liu Yang, Jingyi Yue, Qian Zhou, Jinrong Huang, Yongyun Mao, Qian Li, Jifei Wang, Dongsheng Tang, Yuxin Tang, Bingpu Zhou, Bing Ji   +13 more
wiley   +1 more source

Study on Compound Percussive Drilling: Rock‐Breaking Mechanism of High Confining Pressure Formation in the East China Sea

Energy Science & Engineering
The effect of improving the depth of penetration (ROP) in deep, high‐confining pressure formation is closely related to the rock‐breaking method, which has become a bottleneck restricting the efficient development of oil and gas.
Jiwei Li
doaj   +1 more source

Influence of Matrix Hardness and Diamond Parameters on the Performance of Impregnated Diamond Bits During Rotary-Percussive Drilling

Applied Sciences
Rotary-percussive drilling is extensively used for efficient hard rock breakage, and the performance of impregnated diamond bits (IDBs) is primarily governed by matrix characteristics and diamond parameters.
Zhiming Wang, Ningping Yao, Quanxin Li, Songcheng Tan, Longchen Duan, Jun Fang   +5 more
doaj   +1 more source