Results 1 to 10 of about 322,511 (337)

Reduction of the Pressurization System Final Mass for a Modern Rocket Launcher [PDF]

open access: yesJournal of Aerospace Technology and Management, 2022
The work focuses on optimizing the pressurization system’s operating performance for a fuel tank of a turbo-pumped liquid propellant rocket engine. This system is the most complex and expensive in a medium-size launch vehicle, after the engine.
Yurii Mitikov, Olexiy Shynkarenko
doaj   +1 more source

Therapeutic gases used in balneotherapy and rehabilitation medicine - scientific relevance in the last ten years (2011 – 2020) - Synthetic literature review [PDF]

open access: yesBalneo and PRM Research Journal, 2021
: Background. The medical relevance of therapeutic gases can range from use in burns and stroke victims to hypoxia therapy in children. However, medical gases such as oxygen, hydrogen, helium and xenon have recently come under increased exploration for
MUNTEANU Constantin   +3 more
doaj   +1 more source

Assessing the expansion of the Cambrian Agronomic Revolution into fan-delta environments

open access: yesScientific Reports, 2022
The intensity, extent, and ecosystem-level impact of bioturbation (i.e. Agronomic Revolution) at the dawn of the Phanerozoic is a hotly debated issue.
Andrei Ichaso   +4 more
doaj   +1 more source

Models of helium enrichment in helium-rich gas reservoirs of petroliferous basins in China

open access: yesNatural Gas Industry B, 2023
Owing to the characteristics of chemical inertness, low molecular weight, low boiling point, strong permeability and high heat conductivity, helium is extensively used in the fields of aerospace, low-temperature superconductivity, medicine and high tech,
Shengfei Qin   +4 more
doaj   +1 more source

Helium enrichment mechanism of helium-rich gas reservoirs in central and western China: Degassing and accumulation from ancient groundwater

open access: yesJournal of Natural Gas Geoscience, 2022
Helium, a coordinated resource in natural gas, is an essential and strategic resource, but research on its enrichment mechanism is relatively weak.
Shengfei Qin   +4 more
doaj   +1 more source

Active degassing of crustal CO2 in areas of tectonic collision: A case study from the Pollino and Calabria sectors (Southern Italy)

open access: yesFrontiers in Earth Science, 2022
Carbon dioxide (CO2) is released from the Earth’s interior into the atmosphere through both volcanic and non-volcanic sources in a variety of tectonic settings.
Paolo Randazzo   +10 more
doaj   +1 more source

Nicotinamide adenine dinucleotide and the sirtuins caution: Pro‐cancer functions

open access: yesAging Medicine, 2021
This scoping review aims to perform a brief but comprehensive assessment of existing peer‐reviewed literature and determine whether raising nicotinamide adenine dinucleotide can prevent or promote tumorigenesis. The examination of extensive peer‐reviewed
Raymond D. Palmer, Mauro Vaccarezza
doaj   +1 more source

Effects of Gas Pressure during Electron Beam Energy Deposition in the EBM Additive Manufacturing Process

open access: yesMetals, 2021
Electron beam melting (EBM) is a metal powder bed fusion additive manufacturing (AM) technology that facilitates the production of metal parts by selectively melting areas in layers of metal powder.
Elroei Damri   +5 more
doaj   +1 more source

Precursor comparisons for the upregulation of nicotinamide adenine dinucleotide. Novel approaches for better aging

open access: yesAging Medicine, 2021
Nicotinamide adenine dinucleotide (NAD) is a coenzyme found in every human cell and regulates a number of systems across multiple cellular compartments and tissue types via an endogenous and exogenous influence.
Raymond D. Palmer   +2 more
doaj   +1 more source

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