Results 81 to 90 of about 500,833 (298)

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   +3 more sources

Tracing Sub‐Monolayer Contamination on Wafer‐Scale 2D Materials

Advanced Functional Materials, EarlyView.
Sub‐monolayer adventitious carbon contamination limits the performance and reproducibility of 2D material‐based devices. This study demonstrates scanning helium microscopy (SHeM) as a non‐destructive, ultra‐sensitive tool for wafer‐scale imaging of surface cleanliness.
Chenyang Zhao, Sam M. Lambrick, Ke Wang, Shaoliang Guan, Aleksandar Radić, David J. Ward, Andrew P. Jardine, Boyao Liu   +7 more
wiley   +1 more source

Deuterium retention in tungsten under the combined influence of displacement damage and helium

Nuclear Fusion
Accurate predictions of hydrogen isotope/tritium inventory in tungsten (W), used as a plasma-facing material in fusion reactors, can reduce the uncertainty associated with the self-sustaining fuel cycle.
Ting Wang, Xiu-Li Zhu, Mengchong Ren, Yue Yuan, Wangguo Guo, Shiwei Wang, Long Cheng, Di Hu, Yuhao Li, Guang-Hong Lu   +9 more
doaj   +1 more source

Time damping of non-adiabatic magnetohydrodynamic waves in a partially ionized prominence plasma: Effect of helium

, 2009
Prominences are partially ionized, magnetized plasmas embedded in the solar corona. Damped oscillations and propagating waves are commonly observed. These oscillations have been interpreted in terms of magnetohydrodynamic (MHD) waves.
Ballester, J. L., Oliver, R., Soler, R.
core   +1 more source

Unlocking Multi‐Valley Energy Pockets and Interface‐Induced Phonon Filtering in InSb Thermoelectrics by Reaction‐Driven Interface Engineering

Advanced Functional Materials, EarlyView.
InSb, a narrow‐bandgap semiconductor with high carrier mobility, is promising for thermoelectric energy conversion but suffers from high lattice thermal conductivity and strong bipolar conduction. Here, in situ interface engineering using Co2O3 nanoprecursors forms hierarchical CoSbx/In2O3/CoSb3 heterostructures that enhance phonon scattering and ...
Jiwu Xin, Xiao Yang, Xiao‐Lei Shi, Chengyun Xu, Xi Ling, Pengyu Zhang, Jinfeng Dong, Yong Du, Haisheng Chen, Ting Zhang, Zhi‐Gang Chen   +10 more
wiley   +1 more source

Enhancement of the helium resonance lines in the solar atmosphere by suprathermal electron excitation II: non-Maxwellian electron distributions

, 2003
In solar EUV spectra the He I and He II resonance lines show unusual behaviour and have anomalously high intensities compared with other transition region lines.
Aggarwal, Aggarwal, Anders, Anderson, Anderson, Andretta, Andretta, Athay, Bashkin, Bassani, Benson, Bhatnagar, Bray, Brekke, Brueckner, Carlsson, Cushman, Deridder, Dimitrijević, Dimitrijević, Doschek, Drake, Drake, Fernley, Fontenla, Fontenla, Freudenstein, G. R. Smith, Gabriel, Gallagher, Green, Grevesse, Griem, Hammer, Hansteen, Harper, Hearn, Hinnov, Jordan, Jordan, Jordan, Jordan, Kisielius, Kohl, Landau, Landi, Lanzafame, Ljepojevic, Ljepojevic, Ljepojevic, Macpherson, Martin, Menzel, Mihalas, Munroe, Peter, Pinfield, Sawey, Scharmer, Scudder, Scudder, Scudder, Seaton, Shoub, Smith, Spitzer, Theodosiou, Tobiska, Tobiska, Vernazza, Viñas, Wahlstrøm, Wiese, Wilhelm   +73 more
core   +1 more source

How the Carrier Mobility and Seebeck Coefficient of Doped Semiconducting Polymers Are Controlled by Counterion Interactions and Mesoscale Order

Advanced Functional Materials, EarlyView.
Conventional doping of P3HT with F4TCNQ results in poor charge transport. However, when F4TCNQ is exchanged with LiTFSI, the transport characteristics are greatly enhanced. We find the increase in charge transport is directly related to an increase in the mesoscale ordering of P3HT, resulting in longer and better‐connected transport pathways.
Quynh M. Duong, Diego Garcia Vidales, Xinyu Liu, Charlene Z. Salamat, Austin Ready, Hashim Al Khunaizi, Mei Matsumoto, Alexander M. Spokoyny, Sarah H. Tolbert, Benjamin J. Schwartz   +9 more
wiley   +1 more source

Outcomes of heliox use in children with respiratory compromise: A 10‐year single institution experience

Laryngoscope Investigative Otolaryngology
Objective Heliox, a mixture of helium and oxygen, has been shown to improve laminar airflow and decrease airway resistance in children. This study aims to describe the outcomes of heliox use in children with respiratory compromise and to identify ...
Ashley Young, Eli Stein, Matthew Rowland, Taher Valika, Saied Ghadersohi, Inbal Hazkani   +5 more
doaj   +1 more source

Chirality and Organization of Adsorbates Modify Surface Phonon Dynamics

Advanced Functional Materials, EarlyView.
Chirality and molecular organization are shown to influence surface phonon dynamics in gold films. Time‐resolved Joule heating measurements reveal that ordered homochiral monolayers increase the Debye temperature and disordered layers reduce it, while ordered racemic controls have no effect.
Meital Ozeri, Eugenia Pyurbeeva, Shira Yochelis, Jonas Fransson, Ronnie Kosloff, Oded Millo, Yossi Paltiel   +6 more
wiley   +1 more source

Nanoparticle Shape Dictates Catalytic Performance in Selective Hydrogenation of Butadiene Over Au‐Pd Core‐Shell Nanoparticles

Advanced Functional Materials, EarlyView.
Controlling the exposed crystal facet of shape‐controlled Au‐Pd core‐shell catalysts though colloidal synthesis enhances their catalytic performance in the industrially relevant selective hydrogenation of butadiene. ABSTRACT Selective hydrogenation of butadiene is a critical step in purification of alkene feedstocks for polymer production and is ...
Marta Perxés Perich, Jan‐Willem Lankman, Petra E. de Jongh, Jessi E. S. van der Hoeven   +3 more
wiley   +1 more source