Results 51 to 60 of about 13,003 (153)

Regulation of Particulate Organic Carbon by Cascade Mega‐Reservoirs in the Changjiang Basin: Enhanced Sequestration and Altered Downstream Composition

open access: yesGlobal Biogeochemical Cycles, Volume 39, Issue 8, August 2025.
Abstract Artificial reservoirs significantly alter the natural transport of suspended particulate matter (SPM) from rivers to oceans, thereby reshaping the global carbon cycle through changes in particulate organic carbon (POC) dynamics over decadal to millennial timescales.
Yutian Ke   +9 more
wiley   +1 more source

Long-life mission reliability for outer planet atmospheric entry probes [PDF]

open access: yes
The results of a literature analysis on the effects of prolonged exposure to deep space environment on the properties of outer planet atmospheric entry probe components are presented.
Maycock, J. N., Mccall, M. T., Rouch, L.
core   +1 more source

High School Students' Perspectives on Their Online Learning Experiences: A Systematic Literature Review

open access: yesJournal of Computer Assisted Learning, Volume 41, Issue 4, August 2025.
ABSTRACT Background Online learning has become a popular form of education. Prior to the Covid‐19 pandemic, online learning was mainly associated with higher education, with an incremental growth at the K‐12 level. The pandemic changed this situation rapidly.
Jia Li, Novera Roihan, Matthew McGravey
wiley   +1 more source

Documenting microbial populations within the University of Alberta Meteorite Curation Facility using 16S rRNA gene sequencing: Implications for the curation of astromaterials

open access: yesMeteoritics &Planetary Science, Volume 60, Issue 8, Page 1798-1813, August 2025.
Abstract Meteorites are easily contaminated at the Earth's surface by microbial activity. Here, DNA extracts from two meteorite specimens and samples from curation laboratory surfaces are analyzed with amplicon sequencing, to understand microbial communities that contaminate meteorites and that may be resident in curation facilities.
Libby D. Tunney   +4 more
wiley   +1 more source

Impact reactivity of materials at very high oxygen pressure [PDF]

open access: yes
The requirements for impact testing of materials in an oxygen atmosphere at pressures from 82.7 MPa (12,000 psi) to 172 MPa (25,000 psi) were evaluated.
Connor, H. W.   +3 more
core   +1 more source

Editorial: Women in chemistry 2022. [PDF]

open access: yesFront Chem, 2023
Fahim IS   +15 more
europepmc   +1 more source

A comprehensive model to determine the effects of temperature and species fluctuations on reaction rates in turbulent reacting flows [PDF]

open access: yes
Reaction rates in turbulent, reacting flows are reviewed. Assumed probability density functions (pdf) modeling of reaction rates is being investigated in relation to a three variable pdf employing a 'most likely pdf' model.
Chinitz, W., Goldstein, D., Magnotti, F.
core   +1 more source

Permeability and mechanical integrity of porous biomorphic SiC ceramics for application as hot-gas filters [PDF]

open access: yes, 2016
Biomorphic SiC is a biotemplated material fabricated by Si melt-infiltration of carbon preforms from wood pyrolysis. In this work, porous bioSiC ceramics from five different wood precursors, with porosities between 45 and 72% were studied for their ...
Becerra Villanueva, José Antonio   +4 more
core   +1 more source

Feasibility study of high performance hydrogen-oxygen fuel cells Final technical report [PDF]

open access: yes
Engineering analysis for evaluating moving bed and mediator hydrogen-oxygen fuel cell conceptual ...
Heath, C. E.   +2 more
core   +1 more source

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