A5082746879- Geology and Paleoclimatology Research
- Semantic Web and Ontologies
- Research Data Management Practices
- Soil Carbon and Nitrogen Dynamics
- Archaeology and ancient environmental studies
- Aeolian processes and effects
- Plant Ecology and Soil Science
- Pacific and Southeast Asian Studies
- Solar and Space Plasma Dynamics
- Plant Water Relations and Carbon Dynamics
- Tree-ring climate responses
- Distributed and Parallel Computing Systems
- Stellar, planetary, and galactic studies
- Library Science and Information Systems
- Scientific Research and Philosophical Inquiry
- Astro and Planetary Science
- Atmospheric Ozone and Climate
- Mathematics, Computing, and Information Processing
- Pleistocene-Era Hominins and Archaeology
- Astronomy and Astrophysical Research
- Personal Information Management and User Behavior
- Astrophysics and Cosmic Phenomena
- Impact of Technology on Adolescents
- Advances in Oncology and Radiotherapy
- Biomedical Text Mining and Ontologies
Royal Danish Library
2022-2024
University of Arizona
2020
Aarhus University
2014-2020
Institut de l'Information Scientifique et Technique
2020
ABSTRACT Radiocarbon ( 14 C) ages cannot provide absolutely dated chronologies for archaeological or paleoenvironmental studies directly but must be converted to calendar age equivalents using a calibration curve compensating fluctuations in atmospheric C concentration. Although curves are constructed from independently archives, they invariably require revision as new data become available and our understanding of the Earth system improves. In this volume international both Northern...
Abstract Superflares are large explosive events on stellar surfaces one to six orders-of-magnitude larger than the largest flares observed Sun throughout space age. Due huge amount of energy released in these superflares, it has been speculated if underlying mechanism is same as for solar flares, which caused by magnetic reconnection corona. Here, we analyse observations made with LAMOST telescope 5,648 solar-like stars, including 48 superflare stars. These show that stars generally...
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Tidsskrift.dk fortsatte i 2024 sin vækst, hvor der løbet af året kom 16 nye tidsskrifter til, således at det totale antal og årbøger på platformen er 214. Dermed rundede også en milepæl; nemlig nå over 200 årbøger. Antallet artikler, publiceret hos tidsskrifterne tidsskrift.dk ved årets udgang 112.620, hvoraf de 6.986 dem blev 2024, så aktiviteten fortsat høj, dette afspejles et stort visninger downloads, som nået helt op 11.570.239. Udover den almindelige drift møder kurser for redaktioner,...
Abstract We present measurements of radiocarbon in annual tree rings from the time period 980–1006 Common Era (C.E.), hereby covering cosmic ray event 994 C.E. The new record Danish oak is based on both earlywood and latewood fractions rings, which makes it possible to study seasonal variations 14 C production. show a rapid increase ∼10‰ 993 latewood, followed by modest decline relatively high values over ensuing ∼10 years. This occurs 995 earlywood, suggesting that most likely occurred...
Since the discovery of Kepler-10, system has received considerable interest because it contains a small, rocky planet which orbits star in less than day. The system's parameters, announced by Kepler team and subsequently used further research, were based on only five months data. We have reanalyzed this using full span 29 photometric data, obtained improved information about its planets. A detailed asteroseismic analysis extended time series provides significant improvement stellar...
Abstract Several aspects concerning the origin and nature of grand solar minima remain unclear, more high‐resolution 10 Be 14 C records are needed to improve our understanding these phenomena. Here, we report 137 new high‐precision, annually resolved radiocarbon concentrations based on oak from Danish dendrochronology. The record covers a period (CE 1432–1578) that encompasses most penultimate known as Spörer Minimum. A detailed comparison between Maunder 1640–1720) shows Minimum is...
ABSTRACT Substantial amounts of annual radiocarbon ( 14 C) data have recently been produced with the purpose increasing time resolution C records used for constructing calibration curve and studying occurrence abrupt cosmic-ray events. In this study, we investigate if it is possible to resolve sub-annual scale changes in atmospheric content by measuring early-wood late-wood fractions from Danish oak. The tree-ring samples span period 1954–1970 CE, hereby covering peak bomb pulse. A least...
It has been suggested that the deficit in number of spots on surface Sun between 1790 and 1830, known as Dalton minimum, contained an extra cycle was not identified original sunspot record by Wolf. Though this would be shorter weaker than average solar cycle, it shift magnetic parity field earlier cycles. This is sometimes referred to 'lost cycle' or 'cycle 4b'. Here we reanalyse Be10 measurements with annual resolution from NGRIP ice core Greenland order investigate if hypothesis regarding...
I 2023 har tidsskrift.dk fået 13 nye tidsskrifter med, så det samlede antal på platformen nu er oppe 198. Det artikler, der publiceret hos platformens tidsskrifter, ved årets udgang 105.634, hvoraf 4.774 blev i 2023. Der udarbejdet en ny brugervejledning, gennemført opdateringer og afholdt vejledning, kurser support til tidsskrifterne.Det Kgl. Bibliotek gennemførte samarbejde med Public Knowledge Project (PKP) et sprint juni måned for fællesskabet omkring Open Journal Systems (OJS)...
ABSTRACT Single-year measurements of radiocarbon ( 14 C) in tree rings have led to the discovery rapid cosmic-ray events as well longer lasting anomalies, which given new insights into Sun’s behavior past. Here, we present two single-year C records based on Danish oak that span periods AD 692–790 and 966–1057, respectively, consequently include 775 994. The data are presented along with relevant information dendrochronological dating wood pieces, implying these may contribute towards...
ABSTRACT We here present a comparison of methods for the pretreatment batch tree rings high-precision measurement radiocarbon at Aarhus AMS Centre (AARAMS), University, Denmark. The aim was to develop an efficient and high-throughput method able pretreat ca. 50 samples time. tested two extracting α-cellulose from wood find most optimal our use. One used acetic acid, other HCl acid delignification. testing conducted on background 14 C samples, in order assess effect different low-activity...
ABSTRACT We present a new biennial record of radiocarbon ( 14 C) measured in Danish oak. The covers the years 1251–1378 CE, thereby spanning Grand Solar Minimum known as Wolf Minimum. Two oak samples from every other year were at AMS facility Aarhus University (Denmark), resulting an average precision 1.4‰ for record. Spectral analysis revealed two peaks 27 and 9.1 years, which could indicate Hale cycle was lengthened Schwabe shortened during Minimum, but it is also possible that amplitude...
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Dele af rapporten er på engelsk. Rapporten beskriver et projekt, der skulle få flere danske tidsskrifter optaget i DOAJ. Projektet blev initieret efteråret 2020 og påbegyndt januar 2021. Baggrunden har været at styrke kommunikation, samarbejde videndeling tværs universitetsbiblioteker inden for Det Kgl. Bibliotek, men også nationalt med andre universitetsbiblioteker, arbejder OJS servere (Aalborg Universitetsbibliotek Copenhagen Business School). Initiativet igangsat øge kvalitet synlighed...
Rapporten beskriver et projekt, der skulle få flere danske tidsskrifter optaget i DOAJ. Projektet blev initieret efteråret 2020 og påbegyndt januar 2021. Baggrunden har været at styrke kommunikation, samarbejde videndeling på tværs af universitetsbiblioteker inden for Det Kgl. Bibliotek, men også nationalt med andre universitetsbiblioteker, arbejder OJS servere (Aalborg Universitetsbibliotek Copenhagen Business School). Initiativet er igangsat øge kvalitet synlighed Biblioteks Open Science...
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I 2022 har tidsskrift.dk været en del af Det Kgl. Biblioteks Open Science strategi. Arbejdet i forbindelse med publiceringsservice præget opgradering Journal Systems (OJS) serveren og Monograph Press (OMP) samt den løbende drift de to servere.
 Bibliotek gennemførte samarbejde Aalborg Universitetsbibliotek, CBS Directory of Access Journals (DOAJ) et projekt for at få optaget flere danske (OA) tidsskrifter DOAJ.Der blev udarbejdet nye brugervejledninger, gennemført opdateringer afholdt...