Results 71 to 80 of about 313,034 (335)

Resource potential and extraction technique design for helium in coal measures

Meitian dizhi yu kantan
Back groundHelium is an important strategic scarce resource. Presently, helium used in industry originates primarily from natural gas. In contrast, helium in coal measures, generally emerging as coalbed methane (CBM) with a high helium content, serves as
Lei WANG, Maoyin TANG
doaj   +1 more source

Interference-induced peak splitting in EUV superfluorescence [PDF]

, 2012
We investigate the laser-induced quantum interference in EUV superfluorescence occurring in a dense gas of $\Lambda$-type helium atoms coupled by a coherent laser field in the visible region.
Agostini, Ariunbold, Christoph H. Keitel, Dicke, Dreher, Dutt, Faist, Gibbs, Gisselbrecht, Kiffner, Kiffner, Luo, Mihai Macovei, Nagasono, Ni Cui, Noe, Paradis, Schmidt, Sete, Skribanowitz, Taichenachev, Watanabe   +21 more
core   +1 more source

Revealing How Acid Sites Enhance the Electrocatalytic Glycerol Oxidation Performance on Pt Loaded Zeolite‐Carbon Composite Materials

Advanced Materials, EarlyView.
In the work reported herein, the catalytic effects of acid sites on electrocatalytic glycerol oxidation reaction are investigated by using a novel catalytic material system that integrates Pt metal sites with acidic Al sites. Abstract The catalytic role and function of acid sites in solid acid catalysts, such as zeolites, are well understood in the ...
Ju Ye Kim, Sunjae No, Jinwoo Hwang, Mi Yoo, Hakju Lee, Youngbi Kim, Youngmin Kim, Yong Tae Kim, Jeong‐Chul Kim, Jeong Woo Han, Kyoungsoo Kim, Hyung Ju Kim   +11 more
wiley   +1 more source

The Effect of Helium Sedimentation on Galaxy Cluster Masses and Scaling Relations

, 2011
Recent theoretical studies predict that the inner regions of galaxy clusters may have an enhanced helium abundance due to sedimentation over the cluster lifetime.
A. Miller, Abramopoulos, Allen, Anders, Birkinshaw, Bonamente, Bonamente, Bonamente, Bulbul, Chuzhoy, Chuzhoy, D. Marrone, Ettori, Fabian, G. E. Bulbul, Gilfanov, Hughes, Itoh, Itoh, Kalberla, Kravtsov, M. Bonamente, M. Joy, Mantz, Markevitch, Morrison, N. Hasler, Peng, Qin, Reese, Rephaeli, Shtykovskiy, Smith, T. Mroczkowski, Vikhlinin, Vikhlinin   +35 more
core   +1 more source

Charge dependence of neoclassical and turbulent transport of light impurities on MAST [PDF]

, 2015
Carbon and nitrogen impurity transport coefficients are determined from gas puff experiments carried out during repeat L-mode discharges on the Mega-Amp Spherical Tokamak (MAST) and compared against a previous analysis of helium impurity transport on ...
Casson, F. J., Dickinson, D., Garzotti, L., Henderson, S. S., O'Mullane, M., Patel, A., Roach, C. M., Summers, H. P., Tanabe, H., team, the MAST, Valovic, M.   +10 more
core   +2 more sources

Solvent‐Free Thermal Defect Engineering in Molecular Frameworks With Volatile Linkers

Advanced Materials, EarlyView.
Thermal removal of neutral volatile linkers enables precise and solvent‐free generation of metal vacancies in MOFs. This strategy affords redox‐stable, coordinatively unsaturated FeII sites with tunable spin, ligand coordination, and catalytic behavior. The approach offers a general route to design defect‐functional materials through local coordination
Sonia Martínez‐Giménez, Alejandro Orellana‐Silla, Marta Galbiati, Efrén Navarro‐Moratalla, Luca Braglia, Sara Stolfi, José Antonio Real, Víctor Rubio‐Giménez, Sergio Tatay, Carlos Martí‐Gastaldo   +9 more
wiley   +1 more source

An application of gap regenerator/expander precooled by two stage G-M refrigerator [PDF]

, 1983
The degradation of regenerator effectiveness below 10K is due to the imbalance of the heat capacity of the regenerator material and helium gas as a working fluid.
Matsubara, Y., Yasukochi, K.
core   +1 more source

Tuning Amorphous‐Crystalline Catalytic Interfaces by Mechanochemistry: Cu‐Based Metallic Glasses Coupled with Ceria for CO Oxidation

Advanced Materials, EarlyView.
Ball‐milling Cu‐based metallic glasses with ceria creates a unique nanostructure where metallic glass particles are wrapped by CeO2 nanoparticles. The intimate integration triggers copper state reorganization during reaction and aging, boosting CO oxidation and COPrOx activity.
Maahin Mirzay‐Shahim, Mehran Nabahat, Laia Pascua‐Solé, Isabel Serrano, Ilaria Lucentini, Xènia Garcia, Marina Armengol‐Profitós, Asier Agrelo‐Lestón, Ignasi Burgués‐Ceballos, Núria J. Divins, Ignacio J. Villar‐Garcia, Virginia Pérez‐Dieste, Carlos Escudero, Carlo Marini, Jordi Llorca, Eloi Pineda, Pere Bruna, Lluís Soler   +17 more
wiley   +1 more source

Noble gas isotopic characteristics and helium dilution of coalbed methane from the third coal seam in southern Qinshui Basin [PDF]

Youqicang pingjia yu kaifa
Helium is a crucial strategic resource with very limited reserves, but its enrichment and dilution mechanisms in gas reservoirs remain unclear. Noble gas isotopes play an important role in characterizing the interactions between gas and groundwater.
XU Dan, ZHANG Cong, JIA Huimin, LI Yuhong, QIN Shengfei, ZHANG Wen, ZHOU Junlin, MA Shangwei, FAN Yan
doaj   +1 more source

Spectroscopy and Dynamics of a Two-Dimensional Electron Gas on top of Ultrathin Helium Films on Cu(111)

, 2016
Electrons in image-potential states on the surface of bulk helium represent a unique model system of a two-dimensional electron gas. Here, we investigate their properties in the extreme case of reduced film thickness: a monolayer of helium physisorbed on
Armbrust, Nico, Feulner, Peter, Güdde, Jens, Höfer, Ulrich, Kossler, Sarah   +4 more
core   +1 more source