Results 141 to 150 of about 1,647,655 (410)

Archaeometric Analyses of Medieval Pottery from the Lower Danube Region, Romania

open access: yesChemPlusChem, EarlyView.
This study is about the pottery manufacturing in the Lower Danube region during the Early Medieval period (8th–10th c. AD). Optical microscopy, Particle induced X‐ray emission, and X‐ray diffraction analyses performed on 32 representative ceramic shards excavated at Pantelimonu de Sus, Constanţa County, Romania, provide clues on the raw materials and ...
Constantin Haită   +3 more
wiley   +1 more source

Phase Transformation Processes in Coprecipitated Cu/Zn/Zr Methanol Catalyst Precursors—Insights into Suspension Aging Form Ultrafast Nucleation

open access: yesChemPlusChem, EarlyView.
Catalyst production for methanol synthesis includes an aging step. By ultrafast nucleation, occurring transient changes in the suspension important for later performance can be assessed. Analytical techniques deliver insights which lead to a mechanism in which zincian malachite is the main product, whereas a sodium species play an important role as ...
Lucas Warmuth   +5 more
wiley   +1 more source

Molten‐Salt‐Mediated Chemical Looping Oxidative Dehydrogenation of Ethane with In‐Situ Carbon Capture and Utilization

open access: yesChemSusChem, Volume 18, Issue 6, March 15, 2025.
A sustainable alternative to steam cracking, the molten‐salt‐mediated oxidative dehydrogenation (MM‐ODH) of ethane (C2H6) in Li2CO3‐Na2CO3‐K2CO3 (LNK) couples thermal cracking with melt‐mediated CO2 capture to realize commercially competitive C2H4 and CO yields. LNK composition strongly influences MM‐ODH process outcomes.
Kyle Vogt‐Lowell   +6 more
wiley   +1 more source

Cenozoic sedimentary and volcanic rocks of New Zealand: A reference volume of lithology, age and paleoenvironments with maps (PMAPs) and database. [PDF]

open access: yes, 2015
This volume presents descriptive geological data and text about each Cenozoic sedimentary and volcanic geological unit to formation and member level (in some cases) exposed on land in New Zealand, including their lithology, stratigraphic age and inferred
Kamp, Peter J.J.   +2 more
core   +1 more source

Wetlands as environments of early human occupation: A new classification for freshwater palaeowetlands

open access: yesThe Depositional Record, EarlyView.
A new classification for inland freshwater palaeowetlands to be used in the field or core laboratory by sedimentologists, providing examples from the Guadix Basin (southern Spain). Abstract Present wetlands have proven to be delicate, biodiverse ecosystems, that are natural sinks for CO2 and act as good indicators for climate changes.
S. Pla‐Pueyo   +1 more
wiley   +1 more source

An electronic radon dosimeter as a new multipurpose device – a bridge between dosimetry and monitoring [PDF]

open access: yesGeofísica Internacional, 2002
An electronic radon dosimeter based on deposition of radon decay products on a semiconductor detector coupled with an alpha spectroscopy offers some advantages compared to passive dosimeters.
S. Feige, V. Oeser, T. Streil
doaj  

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