Results 71 to 80 of about 824,380 (294)

Habitability of Super-Earth Planets around Other Suns: Models including Red Giant Branch Evolution [PDF]

open access: yes, 2008
The unexpected diversity of exoplanets includes a growing number of super- Earth planets, i.e., exoplanets with masses of up to several Earth masses and a similar chemical and mineralogical composition as Earth. We present a thermal evolution model for a
Bounama, C.   +4 more
core   +1 more source

Research progress and current status of dynamic wave propagation characteristics in rock mass: A review

open access: yesDeep Underground Science and Engineering, EarlyView.
This review elucidates the velocity–dispersion–attenuation coupling mechanisms of wave propagation in rock masses, compares six representative models, and reveals how pressure, temperature, mineral composition, and anisotropy jointly control dynamic responses in complex geological media.
Jiajun Shu   +8 more
wiley   +1 more source

A Geologic Si‐O‐C Pathway to Incorporate Carbon in Silicates

open access: yesGeophysical Monograph Series, Page 47-54., 2020

This book is Open Access. A digital copy can be downloaded for free from Wiley Online Library.

Explores the behavior of carbon in minerals, melts, and fluids under extreme conditions

Carbon trapped in diamonds and carbonate-bearing rocks in subduction zones are examples of the continuing exchange of substantial carbon ...
Alexandra Navrotsky   +2 more
wiley  

+3 more sources

Precessional variation of monsoon-controlled silicate weathering caused steady atmospheric carbon dioxide consumption during glacial periods

open access: yesCommunications Earth & Environment
Silicate weathering regulates climate as a critical carbon sink, yet understanding its role in the carbon cycle is challenging because of limited knowledge about the impact of temperature and rainfall on weathering during glacial-interglacial cycles ...
Debo Zhao   +9 more
doaj   +1 more source

Groundwater geochemistry and hydrogeochemical processes in the Lower Ganges-Brahmaputra-Meghna River Basin areas, Bangladesh

open access: yesJournal of Asian Earth Sciences: X, 2021
Groundwater geochemistry and hydrogeochemical processeswere investigated from three different river basins in Bangladesh. The data were collected from BGS website.
N.M. Refat Nasher, Md. Humayan Ahmed
doaj   +1 more source

HD 145263: Spectral Observations of Silica Debris Disk Formation via Extreme Space Weathering?

open access: yes, 2020
We report here time domain infrared spectroscopy and optical photometry of the HD145263 silica-rich circumstellar disk system taken from 2003 through 2014.
Britt, D. T.   +11 more
core   +1 more source

Rational design of Ni‐based catalysts for methane dry reforming: Recent advances and future perspectives

open access: yesFlexMat, EarlyView.
Addressing the challenges inherent in dry reforming of methane (DRM), this paper focuses on the structural design and performance optimization of Ni‐based catalysts. The modulation strategies for DRM are systematically reviewed across four dimensions: the micromorphology of active metals, metal‐support interactions, electronic modifications by ...
Bowei Cao, Junlei Zhang, Wanglei Wang
wiley   +1 more source

Silicate weathering and CO2 consumption within agricultural landscapes, the Ohio-Tennessee River Basin, USA [PDF]

open access: yesBiogeosciences, 2012
Myriad studies have shown the extent of human alteration to global biogeochemical cycles. Yet, there is only a limited understanding of the influence that humans have over silicate weathering fluxes; fluxes that have regulated atmospheric carbon dioxide ...
K. A. Welch   +5 more
doaj   +1 more source

A normalised seawater strontium isotope curve: possible implications for Neoproterozoic-Cambrian weathering rates and the further oxygenation of the Earth [PDF]

open access: yes, 2007
The strontium isotope composition of seawater is strongly influenced on geological time scales by changes in the rates of continental weathering relative to ocean crust alteration.
Shields, GA
core   +1 more source

Indication of insensitivity of planetary weathering behavior and habitable zone to surface land fraction

open access: yes, 2012
It is likely that unambiguous habitable zone terrestrial planets of unknown water content will soon be discovered. Water content helps determine surface land fraction, which influences planetary weathering behavior. This is important because the silicate
Anglada-Escudé   +34 more
core   +1 more source

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