Results 71 to 80 of about 252 (179)

Influences of bit button wear on performance of rotary-percussive drilling: MBD-DEM coupling simulation and verification

Journal of Rock Mechanics and Geotechnical Engineering
This paper focuses on the use of rotary-percussive drilling for hard rocks. In order to improve efficiency and reduce costs, it is essential to understand how operational parameters, bit wear, and drilling performance are related.
Jun Wang, Qian Fang, Guoli Zheng, Gan Wang, Jiayao Chen, Junling Zhang, Peng Zhao   +6 more
doaj   +1 more source

A Mission Simulating the Search for Life on Mars with Automated Drilling, Sample Handling, and Life Detection Instruments Performed in the Hyperarid Core of the Atacama Desert, Chile. [PDF]

Astrobiology, 2023
Stoker CR, Glass BJ, Stucky TR, Dave AI, Kobayashi LT, Quinn RC, Moreno-Paz M, Sánchez-García L, Mora MF, Kehl F, Parro V, Willis PA, Davila A, Noe Dobrea E, Rask JC, Ricardo D.   +15 more
europepmc   +1 more source

VIPER’s Mass Spectrometer Observing Lunar Operations (MSolo)

The Planetary Science Journal
The Volatiles Investigating Polar Exploration Rover (VIPER) is a lunar volatiles detection and measurement mission that will land on Mons Mouton near Nobile crater, close to the Moon’s south pole.
Roberto Aguilar Ayala, Janine E. Captain, James T. Smith, Matthew L. Hancock, Alexander W. Jarnot, Kevin E. Smith, Prital J. Johnson, Christopher S. Johnson, Rodolphe Carro, Rolando J. Nieves, Christopher N. Bond, John Trautwein, Kenneth C. Wright, Jaime L. Winfield, Peter Santariello, Amy McAdam, P. Douglas Archer, Gregory Kreinheder, Jorge A. Diaz, Parvathy Prem, Kathleen E. Mandt, Aleksandra Gawronska, Barbara A. Cohen, Jaqueline W. Quinn   +23 more
doaj   +1 more source

Composite Percussive Rock Breaking Mechanism in Deep Strata of Xihu Block,East China Sea Basin

Shiyou jixie
The improvement of rate of penetration(ROP)in deep,high confining pressure formations is closely related to the rock breaking method.In the Xihu block of the East China Sea Basin,the percussive rock breaking method is mainly used to improve ROP.In this ...
Li Jiwei
doaj  

Bow-and-arrow, technology of the first modern humans in Europe 54,000 years ago at Mandrin, France. [PDF]

Sci Adv, 2023
Metz L, Lewis JE, Slimak L.
europepmc   +1 more source

Environmental sound classification using temporal-frequency attention based convolutional neural network. [PDF]

Sci Rep, 2021
Mu W, Yin B, Huang X, Xu J, Du Z.
europepmc   +1 more source

Simulation and Analysis of a Split Drill Bit for Pneumatic DTH Hammer Percussive Rotary Drilling

Geofluids
Reverse circulation impact drilling has the advantages of high drilling efficiency and less dust, which can effectively form holes in hard rock and gravel layer.
Yuanling Shi, Conghui Li
doaj   +1 more source

Source Apportionment of Heavy Metals Based on Multiple Approaches for a Proposed Subway Line in the Southeast Industrial District of Beijing, China. [PDF]

Int J Environ Res Public Health, 2022
Jia X, Xia T, Liang J, Li Y, Zhu X, Zhang D, Wang J.   +6 more
europepmc   +1 more source

An In Vitro Evaluation of Primary Stability Values for Two Differently Designed Implants to Suit Immediate Loading in Very Soft Bone. [PDF]

Dent J (Basel), 2021
Krischik D, Tokgöz SE, van Orten A, Friedmann A, Bilhan H.   +4 more
europepmc   +1 more source

Mission Architecture Using the SpaceX Starship Vehicle to Enable a Sustained Human Presence on Mars. [PDF]

New Space, 2022
Heldmann JL, Marinova MM, Lim DSS, Wilson D, Carrato P, Kennedy K, Esbeck A, Colaprete TA, Elphic RC, Captain J, Zacny K, Stolov L, Mellerowicz B, Palmowski J, Bramson AM, Putzig N, Morgan G, Sizemore H, Coyan J.   +18 more
europepmc   +1 more source