Results 71 to 80 of about 601,537 (357)

Quantum transport equations for Bose systems taking into account nonlinear hydrodynamic processes

open access: yesCondensed Matter Physics, 2014
sing the method of nonequilibrium statistical operator by Zubarev, an approach is proposed for the description of kinetics which takes into account the nonlinear hydrodynamic fluctuations for a quantum Bose system. Non-equilibrium statistical operator is
P.A. Hlushak, M.V. Tokarchuk
doaj   +1 more source

Evaluation of the Electron Contamination in Photon Therapy Using BEAMnrc Code

open access: yesمجله دانشکده پزشکی اصفهان, 2019
Background: Today, high-energy photon beams are widely used in the treatment of all types of cancers. However, the production of electrons as contaminants in the photon pathway provides the necessity for research in this field.
Nahid Chegeni   +3 more
doaj   +1 more source

First-principles study on various point defects formed by hydrogen and helium atoms in tungsten [PDF]

open access: yes, 2017
The different point defects formed by two hydrogen atoms or two helium atoms in tungsten were investigated through first-principles calculation. The energetically favorable site for a hydrogen atom is tetrahedral interstitial site while substitutional site is the most preferred site for a helium atom.
arxiv   +1 more source

Economics, Helium, and the U.S. Federal Helium Reserve: Summary and Outlook

open access: yesNatural Resources Research, 2018
In 2017, disruptions in the global supply of helium reminded consumers, distributors, and policy makers that the global helium supply chain lacks flexibility, and that attempts to increase production from the U.S. Federal Helium Reserve (the FHR) may not
Steven T. Anderson
semanticscholar   +1 more source

Comparative Study of Experimental Methods for Measuring Thermal Properties of 100Cr6 Steel Powders

open access: yesAdvanced Engineering Materials, EarlyView.
This study investigates the thermal properties of 100Cr6 steel in both bulk and powder forms. Measuring the very low thermal conductivity typically exhibited by powders poses significant challenges. To address this, two novel measurement techniques—temperature gradient and finite laser pulse response—are introduced and evaluated by comparison with the ...
Junsheng Zhuo   +8 more
wiley   +1 more source

Feasibility and key technologies for the construction of salt cavern helium storage in China

open access: yesYou-qi chuyun
[Objective] Due to the scarcity of helium resources, insufficient production, high external dependence and single source, the security situation of helium resources in China is very severe.
ZHOU Zhaoheng   +3 more
doaj   +1 more source

The Resource Potential and Development Prospect of Helium in Changqing Gas Field

open access: yesGeofluids, 2022
Helium, a rare gas widely applied in high-tech fields, is a significant strategic resource in China. The foreign-trade dependence ratio of helium in China is 95%. The work reviewed the applications and market analysis of helium and reservoir modeling and
Dahai Wang   +6 more
doaj   +1 more source

Propulsion apparatus and method using boil-off gas from a cryogenic liquid [PDF]

open access: yes, 1986
A propulsion system and method are disclosed for controlling the attitude and drag of a space vehicle. A helium dewar contains liquid helium which cools an experiment package.
Blount, D. H.
core   +1 more source

Precision Measurement of the Helium Flux in Primary Cosmic Rays of Rigidities 1.9 GV to 3 TV with the Alpha Magnetic Spectrometer on the International Space Station.

open access: yesPhysical Review Letters, 2015
Knowledge of the precise rigidity dependence of the helium flux is important in understanding the origin, acceleration, and propagation of cosmic rays. A precise measurement of the helium flux in primary cosmic rays with rigidity (momentum/charge) from 1.
M. Aguilar   +299 more
semanticscholar   +1 more source

Universal Superconductivity in FeTe and All‐Iron‐Based Ferromagnetic Superconductor Heterostructures

open access: yesAdvanced Functional Materials, EarlyView.
The first all‐iron‐based ferromagnetic superconductor heterostructures with high‐temperature superconductivity and strong ferromagnetism aredemonstrated. From this, it is discovered that FeTe becomes universallysuperconducting with a minute level of cationic impurities through doping ordiffusion from neighboring layers, suggesting its ground state can ...
Hee Taek Yi   +12 more
wiley   +1 more source

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