Results 61 to 70 of about 142,974 (226)

Precursor Mineral Phases of Forming Mollusk Shell Nacre: A Study of Hydrated Samples

Advanced Functional Materials, EarlyView.
Mineral, organic phase, and water are the essential components in mollusk shell nacre formation. Their interplay is not well understood, because the hydrated material is difficult to observe at high resolution, under close to native conditions. Forming nacre is studied using environmental and cryo‐electron microscopy and hydrated ACC phases, together ...
Anna Kozell, Xiao‐Meng Sui, Neta Varsano, Stephen Weiner, Lia Addadi   +4 more
wiley   +1 more source

Numerical study of rock-breaking mechanism in hard rock with full PDC bit model in compound impact drilling

Energy Reports, 2023
Geothermal reservoir rocks have the characteristics of high stress, high hardness and high abrasiveness, which makes the drilling rate low and the drilling cost high, and hinders the application of geothermal energy. Improving drilling efficiency in hard
Jian Huang, Bo Zeng, Yuhang He, Xudong Wang, Liqin Qian, Chengyu Xia, Xianzhong Yi   +6 more
doaj   +1 more source

Microplastics from Wearable Bioelectronic Devices: Sources, Risks, and Sustainable Solutions

Advanced Functional Materials, EarlyView.
Bioelectronic devices (e.g., e‐skins) heavily rely on polymers that at the end of their life cycle will generate microplastics. For research, a holistic approach to viewing the full impact of such devices cannot be overlooked. The potential for devices as sources for microplastics is raised, with mitigation strategies surrounding polysaccharide and ...
Conor S. Boland
wiley   +1 more source

Rock‐breaking mechanism and efficiency of straight‐swirling mixed nozzle for the nondiagenetic natural gas hydrate in deep‐sea shallow

Energy Science & Engineering, 2020
Jet breaking using a high‐pressure nozzle is one solution for breaking natural gas hydrate (NGH) formations, creating a larger breaking volume and fluidizing broken solid fragments.
Yang Tang, Peng Sun, Guorong Wang, Biwei Fu, Jiaxin Yao   +4 more
doaj   +1 more source

PRINCIPLES OF ROCK PRESSURE ENERGY USAGE DURING UNDERGROUND MINING OF DEPOSITS [PDF]

, 2017
Purpose. To substantiate principles of rock pressure usage during underground mining of deposits. Methodology. Zonal structuring indices of massif around mine workings were established with help of industrial, laboratory and theoretical research of ...
Khomenko, O. Ye, Malanchuk, Ye. Z, Malanchuk, Z. R, Sudakov, А. К   +3 more
core  

Coevolutionary dynamics of a variant of the cyclic Lotka-Volterra model with three-agent interactions

, 2020
We study a variant of the cyclic Lotka-Volterra model with three-agent interactions. Inspired by a multiplayer variation of the Rock-Paper-Scissors game, the model describes an ideal ecosystem in which cyclic competition among three species develops ...
Ferriani, Stefano, Palombi, Filippo, Toti, Simona   +2 more
core   +1 more source

Colloidal Crack Sintering Lithography for Light‐Induced Patterning of Particle Assemblies

Advanced Functional Materials, EarlyView.
Colloidal crack sintering lithography (CCSL) is a microfabrication technique that uses light‐induced photothermal heating to trigger sintering and controlled cracking in polymer colloidal assemblies. Local structural changes generate microchannels and patterns, enabling direct writing of diverse topographic motifs.
Marius Schoettle, Ariane V. Mader, Willem L. Noorduin   +2 more
wiley   +1 more source

Damage characteristics and energy evolution of heterogeneous loaded rocks under the combined action of water jet and cutter tooth impact

Gong-kuang zidonghua
To investigate the efficiency and mechanism of breaking heterogeneous rocks using a combined water jet and cutter tooth under high-stress conditions in deep complex formations, a numerical model was established based on the smoothed particle ...
MA Hongyu, WAN Wen, WANG Long, CHEN Yong, YANG Yuxuan, DENG Shunchun, ZHOU Yong   +6 more
doaj   +1 more source

Comparative simulation research on the stress characteristics of supercritical carbon dioxide jets, nitrogen jets and water jets

Engineering Applications of Computational Fluid Mechanics, 2017
In previous studies it has been shown that supercritical carbon dioxide (SC-CO2) jets are more efficient at rock breaking than water jets, but the corresponding systematic mechanism explanations were not available.
Mukun Li, Hongjian Ni, Ruihe Wang, Caiyun Xiao   +3 more
doaj   +1 more source

Experimental evidence of accelerated seismic release without critical failure in acoustic emissions of compressed nanoporous materials

, 2018
The total energy of acoustic emission (AE) events in externally stressed materials diverges when approaching macroscopic failure. Numerical and conceptual models explain this accelerated seismic release (ASR) as the approach to a critical point that ...
Baró, Jordi, Castillo, Pedro O., Dahmen, Karin A., Davidsen, Jörn, Nataf, Guillaume F., Planes, Antoni, Salje, Ekhard K. H., Vives, Eduard   +7 more
core   +1 more source