Results 11 to 20 of about 3,634,993 (297)

Heliotropic dust rings for Earth climate engineering [PDF]

open access: yes, 2013
This paper examines the concept of a Sun-pointing elliptical Earth ring comprised of dust grains to offset global warming. A new family of non-Keplerian periodic orbits, under the effects of solar radiation pressure and the Earth's J(2) oblateness ...
Bewick, Russell   +4 more
core   +4 more sources

Orbital dynamics of "smart dust" devices with solar radiation pressure and drag [PDF]

open access: yes, 2011
This paper investigates how perturbations due to asymmetric solar radiation pressure, in the presence of Earth shadow, and atmospheric drag can be balanced to obtain long-lived Earth centred orbits for swarms of micro-scale 'smart dust' devices, without ...
Colombo, Camilla, McInnes, Colin
core   +3 more sources

A passive satellite deorbiting strategy for medium Earth orbit using solar radiation pressure and the J(2) effect [PDF]

open access: yes, 2012
The growing population of space debris poses a serious risk to the future of space flight. To effectively manage the increase of debris in orbit, end-of life disposal has become a key requirement for future missions.
Colombo, Camilla   +2 more
core   +4 more sources

Palaeoenvironmental signatures revealed from rare earth element (REE) compositions of vertebrate microremains of the Vesiku Bone Bed (Homerian, Wenlock), Saaremaa Island, Estonia [PDF]

open access: yes, 2015
The Estonian Journal of Earth Sciences is an open access journal and applies the Creative Commons Attribution 4.0 International License CC BY to all its papers (http://creativecommons.org/licenses/by/4.0/).
Alberto Pérez-Huerta   +20 more
core   +2 more sources

T1–T2 microscale correlation relaxometry for in situ high-pressure nuclear magnetic resonance [PDF]

open access: yesMatter and Radiation at Extremes
Over the last decade, frequency-domain in situ high-pressure nuclear magnetic resonance (NMR) spectroscopy in diamond anvil cells (DACs) has been employed as a structural and electronic probe of condensed matter systems at pressures well into the megabar
Thomas Meier   +14 more
doaj   +1 more source

Field Study on Earth Pressure of Finite Soil Considering Soil Displacement

open access: yesApplied Sciences, 2022
The classical earth pressure theory assumes a semi-infinite soil behind the wall, which is no longer applicable to the problem of earth pressure in the case of finite soil.
Haibo Hu   +5 more
doaj   +1 more source

Using dimers to measure biosignatures and atmospheric pressure for terrestrial exoplanets [PDF]

open access: yes, 2014
We present a new method to probe atmospheric pressure on Earth-like planets using (O-O) dimers in the near-infrared. We also show that dimer features could be the most readily detectable biosignatures for Earth-like atmospheres and may even be detectable
Misra, A.   +4 more
core   +1 more source

Orbital dynamics of earth-orbiting 'smart dust' spacecraft under the effects of solar radiation pressure and aerodynamic drag [PDF]

open access: yes, 2010
This paper investigates how the perturbations due to asymmetric solar radiation pressure, in presence of Earth's shadow, and atmospheric drag can be balanced to obtain long-lived Earth centered orbits for swarms of SpaceChips, without the use of active ...
Colombo, C., McInnes, C.R.
core   +4 more sources

Model tests on earth pressure and settlement of shield tunnel crossing adjacent underground retaining structures

open access: yesYantu gongcheng xuebao, 2020
To study the influences on the earth pressure and ground settlement when the shield tunnel passes through the adjacent underground retaining structures, a self-designed test device is developed, and 15 model tests are carried out taking into account the ...
RUI Rui 1, HE Qing 1, CHEN Cheng 1, ZHAI Yu-xin 1, 2
doaj   +1 more source

Thermodynamic Properties of MgAl2O4 Spinel at High Temperatures and High Pressures

open access: yesCrystals, 2023
Thermodynamic properties of MgAl2O4 spinel are significant in understanding the phase relations of the Earth’s crust and upper mantle, but available values from experimental measurements are limited at ambient pressure conditions to date.
Wuxueying Qiu   +3 more
doaj   +1 more source

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