Results 101 to 110 of about 559,916 (326)

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

Comparison between electropositive and electronegative cold atmospheric-pressure plasmas: a modelling study

High Voltage, 2016
Cold atmospheric-pressure He + N(2) and He + O(2) plasmas are chosen as the representatives for electropositive and electronegative plasmas, of which the discharge characteristics are studied and then compared to each other by fluid models.
Ding Xin Liu, Jia Feng Li, Ai Jun Yang, Xiao Hua Wang, Ming Zhe Rong, Michael G. Kong   +5 more
doaj   +1 more source

In-situ measurement of the permittivity of helium using microwave NbN resonators

, 2008
By measuring the electrical transport properties of superconducting NbN quarter-wave resonators in direct contact with a helium bath, we have demonstrated a high-speed and spatially sensitive sensor for the permittivity of helium. In our implementation a
A. Monfardini, C. Hoffmann, G. J. Grabovskij, J.-C. Villégier, L. J. Swenson, Mazin B. A., O. Buisson, Pozar D. M.   +7 more
core   +2 more sources

A Functional 2D Carbon Allotrope Combining Nanoporous Graphene and Biphenylene Segments

Advanced Materials, EarlyView.
The synthesis of a novel nanoporous graphene (NPG) is reported with biphenylene segments via thermal fusion of 12‐armchair porous graphene nanoribbons grown on gold surfaces. Characterization using STM, AFM, and DFT reveals low‐defect semiconducting behaviour and tunable band gaps.
Paula Angulo‐Portugal, Martin Irizar, Longfeng Huang, Mamun Sarker, Mustafa A. Ashoush, Zakaria M. Abd El‐Fattah, Johannes Barth, Frederik Schiller, Afaf El‐Sayed, Fei Gao, Dimas G. de Oteyza, Alexander Sinitskii, Aran Garcia‐Lekue, Martina Corso, Ignacio Piquero‐Zulaica   +14 more
wiley   +1 more source

Re‐evaluation of argon (E 938) and helium (E 939) as food additives

EFSA Journal
The Panel on Food Additives and Flavourings (FAF) provides a scientific opinion re‐evaluating the safety of the two food additives argon (E 938) and helium (E 939). Argon (Ar) and helium (He) are two noble gases, highly stable single atoms.
EFSA FAF Panel (EFSA Panel on Food Additives and Flavourings), Laurence Castle, Monica Andreassen, Gabriele Aquilina, Maria Bastos, Polly Boon, Biagio Fallico, Reginald Fitzgerald, Maria Jose Frutos Fernandez, Bettina Grasl‐Kraupp, Ursula Gundert‐Remy, Rainer Gürtler, Eric Houdeau, Marcin Kurek, Henriqueta Louro, Patricia Morales, Sabina Passamonti, Salvatore Multari, Josef Daniel Rasinger, Ana Maria Rincon, Sam Vermeiren, Camilla Smeraldi   +21 more
doaj   +1 more source

Regeneration experiments below 10K in a regenerative-cycle cryocooler [PDF]

, 1983
At temperatures below 10K, regenerative cycle cryocoolers are limited by regeneration losses in the helium working fluid which result from the decreasing heat capacity of the regenerating material and the increasing density of helium.
Paulson, D. N., Sager, R. E.
core   +1 more source

Observation of Topological Chirality Switching Induced Freezing of a Skyrmion Crystal

Advanced Materials, EarlyView.
Using Lorentz Transmission electron microscopy, it is shown that in the insulating van der Waals ferromagnet, CrBr3, a magnetic field can cause Bloch skyrmionic bubbles to spontaneously switch their chirality. As achiral type‐II bubbles are an intermediate state, the bubbles rapidly elongate and shrink when switching, thereby inducing a freezing of the
John Fullerton, Yue Li, Harshvardhan Solanki, Sergey Grebenchuk, Magdalena Grzeszczyk, Zhaolong Chen, Makars Šiškins, Kostya S. Novoselov, Maciej Koperski, Elton J. G. Santos, Charudatta Phatak   +10 more
wiley   +1 more source

Helium isotope, C/3He, and Ba‐Nb‐Ti signatures in the northern Lau Basin: Distinguishing arc, back‐arc, and hotspot affinities

Geochemistry, Geophysics, Geosystems, 2015
The northern Lau Basin hosts a complicated pattern of volcanism, including Tofua Arc volcanoes, several back‐arc spreading centers, and individual “rear‐arc” volcanoes not associated with these structures.
John Lupton, Kenna H. Rubin, Richard Arculus, Marvin Lilley, David Butterfield, Joseph Resing, Edward Baker, Robert Embley   +7 more
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

Efficient atomization of cesium metal in solid helium by low energy (10 μJ) femtosecond pulses [PDF]

, 2009
Mathieu Melich, J. Dupont-Roc, Ph. Jacquier   +2 more
openalex   +1 more source