Results 31 to 40 of about 265 (205)
A Dislocation Perspective on Strength and Toughness in Ceramics
Advanced Engineering Materials, EarlyView.Dislocations in ceramics enjoy a long but yet under‐appreciated history. The three research waves for dislocations in ceramics highlight the topic evolution over the last 90 years. This review focuses on the impact of dislocation on strength and toughness in ceramics.
Xufei Fang
wiley +1 more source
Shock and Vibration, 2021 In order to solve the problem of pressure relief gas control under high-strength fully mechanized top-coal caving in low-gas-thick-coal seams, this paper studies the evolution of overburden structures and the distribution characteristics of fissure ...
Han Gao +4 more
doaj +1 more source
Application of Air Percussion Drilling Improves Drilling Efficiency in Horizontal Sandstone Wells
, 2010 EQT Production has implemented a new technique for drilling horizontal wells in the hard formations of the Appalachian Basin. Air percussion drilling has been adopted for use horizontally in the Berea sandstone, a hard and abrasive sandstone reservoir ...
Shantanu Swadi +4 more
core +1 more source
Advanced Functional Materials, EarlyView.Multiscale experiments and modeling reveal how Ti3C2Tx MXene nanosheets reinforce PVDF nanocomposites. An optimal MXene loading (∼1 wt.%) nearly doubles tensile strength through efficient stress transfer, flake alignment, and crack‐deflection mechanisms, transforming ductile polymer behavior into a controlled multi‐stage fracture pathway which aligns ...
Bita Soltan Mohammadlou +5 more
wiley +1 more source
Meikuang AnquanAiming at the problems of low comprehensive efficiency and high treatment cost in the conventional treatment of mining pressure relief gas in “U” ventilation mining face, taking a mining face in Jincheng Mining Area, Shanxi Province as the research ...
Weifeng YANG +4 more
doaj +1 more source
Measurement-while-drilling (MWD) development for air drilling [PDF]
, 1992 The objective of this program is to tool-harden and make commercially available an existing wireless MWD tool to reliably operate in an air, air-mist, or air-foam environment during Appalachian Basin oil and gas directional drilling operations in ...
Harrison, W. H. +2 more
core
Advanced Functional Materials, EarlyView.Flexible piezoresistive pressure sensors underpin wearable and soft electronics. This review links sensing physics, including contact resistance modulation, quantum tunneling and percolation, to unified materials/structure design. We highlight composite and graded architectures, interfacial/porous engineering, and microstructured 3D conductive networks
Feng Luo +2 more
wiley +1 more source
Steerable percussion air drilling system [PDF]
, 1995 In the Steerable Percussion Air Drilling System (SPADS), air percussion is used to drill directionally in hard formations. Compared to mud or air powered PDM motors, SPADS offers directional drilling at high penetration rate, reduced mud costs ...
Gray, M.A., Oliver, M.S., Bui, H.D.
core
, 2020 Pemboran adalah kegiatan membuat lubang vertikal ke dalam tanah. Dalam keadaan tertentu pemboran dapat juga dilakukan secara miring (directional drilling) atau disebut juga pemboran berarah.
Alpiana, Alpiana +2 more
core +1 more source
Research on vibration and deflection for drilling tools of coal auger [PDF]
, 2017 Coal augers is a new type of mining equipment used in thin coal seam, and directional drilling performance of its drilling tools becomes the key issue in the equipment service life and drilling efficiency.
Li Jianping +3 more
core +1 more source