Results 121 to 130 of about 7,058,324 (263)

Potassium release from K-bearing minerals treated with organic acids under laboratory conditions

Discover Soil
Background and aims Potassium (K)-bearing minerals are vital for soil fertility and act as slow-release reservoirs for plant nutrients. Organic acids, such as oxalic and citric acids, enhance K dissolution.
Ayodeji Sunday Awoniyi, Adebayo Jonathan Adeyemo, John Okhienaiye Agbenin, Augustus Oludotun Ilori, Dener Márcio da Silva Oliveira, Diego Antonio França de Freitas   +5 more
doaj   +1 more source

Out in the cold? A review of Early Middle Palaeolithic settlements in northern Central Europe, age data and geological preconditions for site formation and preservation

Boreas, EarlyView.
The characteristics of settlement of Neanderthals in northern Central Europe during the earlier phases of the Middle Palaeolithic (Marine Isotope Stage 8–6) have been a matter of debate for decades, specifically regarding the population dynamics at such latitudes during the coldest phases. In this paper, we review the known archaeological record of the
Gianpiero Di Maida, Jutta Winsemann, Malte Hoffmann, Tobias Lauer, Utz Böhner, Thomas Terberger   +5 more
wiley   +1 more source

Layer Formation on Feldspar Bed Particles during Indirect Gasification of Wood. 1. K-Feldspar [PDF]

, 2019
The choice of bed material for biomass gasification plays a crucial role for the overall efficiency of the process. Olivine is the material conventionally used for biomass gasification due to the observed activity of olivine toward cracking of unwanted ...
Seemann, Martin,, Hannl, Thomas Karl,, Vilches, Teresa Berdugo, Berdugo Vilches, Teresa, Knutsson, Pavleta,, Kuba, Matthias, Faust, Robin, Faust, Robin,, Öhman, Marcus,, Hannl, Thomas Karl, Öman, Marcus,, Seemann, Martin, Kuba, Matthias,, Ohman, Marcus, Knutsson, Pavleta, 6man, Marcus, Berdugo Vilches, Teresa,   +16 more
core   +1 more source

Refining the timing of Middle Pleistocene (MIS 12 to MIS 6) ice advances into northern central Europe: sedimentological analysis and single‐grain luminescence dating of glaciotectonic complexes and tunnel‐valley fills

Boreas, EarlyView.
We summarize the current state of knowledge on the age of the Middle Pleistocene ice advances into northern central Europe and provide 25 new single‐grain feldspar luminescence ages of Elsterian and Saalian glacigenic sediments to constrain the age of the ice advances and their tentative correlation with marine isotope stages/substages.
Niklas von Soest, Neda Rahimzadeh, Debra Colarossi, Falko Malis, Tobias Lauer, Wera Sander‐Beuermann, Yvonne Spychala, Christian Brandes, Runa Fälber, Sumiko Tsukamoto, Jutta Winsemann   +10 more
wiley   +1 more source

Chironomid‐based summer temperature reconstruction of the Eemian–Weichselian transition at Lichtenberg, northern Germany

Boreas, EarlyView.
Understanding the temperature variability of past interglacial cycles is essential to predict future climates. We present a new summer temperature reconstruction, based on the subfossil chironomid record from a small palaeolake adjacent to the Middle Palaeolithic site of Lichtenberg, northern Germany. The record spans from the Saalian late glacial over
Sonja Rigterink, Bartosz Kotrys, Michael Hein, Xuan Li, Neda Rahimzadeh, Agnieszka Gruszczyńska, Marcel Weiss, Brigitte Urban, David Colin Tanner, Tobias Lauer, Antje Schwalb   +10 more
wiley   +1 more source

Mineral Reaction Kinetics During Water–Rock Interactions of Julong Hot Springs, Northern China

Geofluids
To elucidate the water–rock interaction mechanisms of the Julong Hot Springs in Changbai Mountain, this study first analyzed the leaching patterns of hydrochemical components in water–rock interactions. The PHREEQC software was then utilized to calculate
Yapeng Tuo, Man Li, Yao Li, Mingrong Zhang, Guoji Li, Guangxiong Qin, Baizhong Yan   +6 more
doaj   +1 more source

Towards an ‘absolute’ timing of biostratigraphic and environmental phases from the Saalian late glacial to the Weichselian pleniglacial in central Europe—Insights from a lacustrine succession in Lichtenberg, northern Germany

Boreas, EarlyView.
Palynological records are central to the biostratigraphic subdivision of the Late Pleistocene in central Europe. Yet many interglacial and interstadial phases—such as the Eemian, Brörup and Odderade—remain only poorly constrained in time due to limited numerical dating.
Michael Hein, Thomas Kasper, Alexis Badai Samudra, Martin Theuerkauf, Markus Lothar Fischer, Neda Rahimzadeh, Maria Sekar Proborukmi, Sonja Rigterink, Agnieszka Gruszczyńska, Christian Zeeden, Simon Parfitt, David John Horne, Lucy Roberts, Dustin White, Lisa Brogmus, Hans von Suchodoletz, Tobias Lauer, Marcel Weiss, David Colin Tanner, Brigitte Urban   +19 more
wiley   +1 more source

K-feldspar – H2 interaction in the context of underground hydrogen storage [PDF]

Geologic reservoirs, including sandstones, can serve as sites for underground hydrogen storage (UHS). However, for a successful commercial application, a more detailed knowledge of the rock–pore-water–hydrogen gas (H2) systems is necessary.
Kővágó, Ákos, Árvai, Csaba, Falus, György, Mika, László Tamás, Gelencsér, Orsolya, Németh, Tibor, Tóth, Péter, Szabó-Krausz, Zsuzsanna, Breitner, Dániel   +8 more
core   +1 more source

Assessment and Correction of Non‐Linearity Effects for In Situ Rb‐Sr Geochronology Applied to High 87Rb/86Sr Mica

Geostandards and Geoanalytical Research, EarlyView.
Key Points Measurement of 86Sr at count rates < 1500 cps can result in statistical bias. Non‐linear signals in analogue detection mode (e.g., Rb) present a challenge for accurately dating high 87Rb/86Sr mica (> 1000). Accounting for these considerations, high 87Rb/86Sr mica are dated here with accuracies of ∼ 1%.
Duane C. Petts, William J. Davis, Simon E. Jackson, Jamie A. Cutts, Janina Czas, Alfredo Camacho   +5 more
wiley   +1 more source

Effects of Acidic Media on the Mechanical and Optical Properties of Digitally Designed Restorative Materials

Journal of Esthetic and Restorative Dentistry, EarlyView.
ABSTRACT Objective This investigation assessed how acidic environments affect the optical behavior, surface roughness, and hardness of a newly developed 3D‐printed permanent resin compared with commonly used computer‐aided design/computer‐aided manufacturing restorative blocks.
Ismini Papoulidou, Petros Mourouzis, Andrea Baldi, Nicola Scotti, Dimitrios Dionysopoulos   +4 more
wiley   +1 more source