scholarly journals Paleoclimatic Implications of Radiocarbon Dating Of Speleothems from the Cracow-Wieluń Upland, Southern Poland

Radiocarbon ◽  
1995 ◽  
Vol 37 (2) ◽  
pp. 103-110 ◽  
Author(s):  
Anna Pazdur ◽  
Mieczysław F. Pazdur ◽  
Jacek Pawlyta ◽  
Andrzej Górny ◽  
Michał Olszewski
Keyword(s):  
Systematic Study ◽  
Radiocarbon Dating ◽  
Karst Region ◽  
Radiocarbon Dates ◽  
Preliminary Results ◽  
Last Glaciation ◽  
Geological Museum ◽  
Paleoclimatic Records ◽  
Age Range

We report preliminary results of a long-term systematic study intended to gather paleoclimatic records from precisely dated speleothems. The research project is limited to speleothems deposited in caves of the Cracow-Wieluń Upland, the largest and best-explored karst region in Poland, covering ca. 2900 km2 with >1000 caves. Speleothem samples were selected from collections of the Geological Museum of the Academy of Mining and Metallurgy in Cracow. Radiocarbon dates of these samples from ca. 45–20 ka bp almost exactly coincide with age range of the Interplenivistulian. A break in speleothem formation between ca. 20 and 10 ka bp may be interpreted as a result of serious climatic deterioration associated with the maximum extent of the last glaciation. We observed differences among 14C, U/Th and AAR dating results. Changes of δ13C and δ18O in speleothems that grew between ca. 30 and 20 ka bp may be interpreted as changes of paleoclimatic conditions.

scholarly journals Developments in the Calibration and Modeling of Radiocarbon Dates

Radiocarbon ◽  
2010 ◽  
Vol 52 (3) ◽  
pp. 953-961 ◽  
Author(s):  
Christopher Bronk Ramsey ◽  
Michael Dee ◽  
Sharen Lee ◽  
Takeshi Nakagawa ◽  
Richard A Staff
Keyword(s):  
Radiocarbon Dating ◽  
Rapid Development ◽  
Model Averaging ◽  
Data Sets ◽  
Calibration Data ◽  
Statistical Tools ◽  
Core Element ◽  
Radiocarbon Dates ◽  
New Methods ◽  
Age Range

Calibration is a core element of radiocarbon dating and is undergoing rapid development on a number of different fronts. This is most obvious in the area of 14C archives suitable for calibration purposes, which are now demonstrating much greater coherence over the earlier age range of the technique. Of particular significance to this end is the development of purely terrestrial archives such as those from the Lake Suigetsu sedimentary profile and Kauri tree rings from New Zealand, in addition to the groundwater records from speleothems. Equally important, however, is the development of statistical tools that can be used with, and help develop, such calibration data. In the context of sedimentary deposition, age-depth modeling provides a very useful way to analyze series of measurements from cores, with or without the presence of additional varve information. New methods are under development, making use of model averaging, that generate more robust age models. In addition, all calibration requires a coherent approach to outliers, for both single samples and where entire data sets might be offset relative to the calibration curve. This paper looks at current developments in these areas.

scholarly journals Preliminary results of long-term slip rates of 1999 earthquake fault by luminescence and radiocarbon dating

2003 ◽  
Vol 22 (10-13) ◽  
pp. 1213-1221 ◽  
Author(s):  
Yue-Gau Chen ◽  
Ya-Wen Chen ◽  
Wen-Shan Chen ◽  
Jia-Fu Zhang ◽  
Hui Zhao ◽  
...  
Keyword(s):  
Radiocarbon Dating ◽  
Earthquake Fault ◽  
Slip Rates ◽  
Preliminary Results

scholarly journals A Critical Review of Radiocarbon Dating of a Norse Settlement at L'Anse Aux Meadows, Newfoundland Canada

Radiocarbon ◽  
1989 ◽  
Vol 31 (03) ◽  
pp. 976-985 ◽  
Author(s):  
Reidar Nydal
Keyword(s):  
High Precision ◽  
Critical Review ◽  
Radiocarbon Dating ◽  
Recent Progress ◽  
Sample Material ◽  
Radiocarbon Dates ◽  
University Of Toronto ◽  
The University ◽  
Age Range ◽  
Problematic Feature

Recent progress in high-precision calibrations of radiocarbon dates has led to evaluations of earlier research. This has been the case with dates from the Norse settlement at L'Anse aux Meadows which was discovered by Helge Ingstad in 1960. The most problematic feature of this series up to now was the use of sample material which partly derived from driftwood. The present paper concludes that charcoal from this site demonstrated no greater errors than normal from other settlement sites. With an assumed total systematic error of 30 ± 20 years, as a mean for various tree rings, the calibrated age range of L'Anse aux Meadows is AD 975–1020. This agrees well with the assumed historical age of ca AD 1000, a result which has also been recently corroborated by high-precision accelerator dating at the University of Toronto.

scholarly journals Puzzling Radiocarbon Dates for the Upper Paleolithic Site of Sungir (Central Russian Plain)

Radiocarbon ◽  
2014 ◽  
Vol 56 (2) ◽  
pp. 451-459 ◽  
Author(s):  
Yaroslav V Kuzmin ◽  
Johannes van der Plicht ◽  
Leopold D Sulerzhitsky
Keyword(s):  
Radiocarbon Dating ◽  
Careful Analysis ◽  
Upper Paleolithic ◽  
Russian Plain ◽  
Present Stage ◽  
Paleolithic Site ◽  
Radiocarbon Dates ◽  
Animal Bones ◽  
Human Burials ◽  
Age Range

A summary is presented of more than a decade-long study of direct radiocarbon dating for one of the most important human burials in Eurasia, the Sungir site in eastern Europe. Eighteen 14C dates were produced before early 2014 on three skeletons (Sungir 1–3), and there is still no consistency in the results. In the absence of other independent methods to establish the antiquity of Sungir, a careful analysis is performed of the site's stratigraphy, paleoenvironment, and 14C dates run on animal bones from the same layer as the burials. Although the conclusions of this work cannot be guaranteed to be absolutely correct, we suggest that at the present stage of research the age range of ∼26,000–27,210 BP is the most probable time for the creation of the elaborate human burials at the Sungir site.

scholarly journals Puzzling Radiocarbon Dates for the Upper Paleolithic Site of Sungir (Central Russian Plain)

Radiocarbon ◽  
2014 ◽  
Vol 56 (02) ◽  
pp. 451-459
Author(s):  
Yaroslav V Kuzmin ◽  
Johannes van der Plicht ◽  
Leopold D Sulerzhitsky
Keyword(s):  
Radiocarbon Dating ◽  
Careful Analysis ◽  
Upper Paleolithic ◽  
Russian Plain ◽  
Present Stage ◽  
Paleolithic Site ◽  
Radiocarbon Dates ◽  
Animal Bones ◽  
Human Burials ◽  
Age Range

A summary is presented of more than a decade-long study of direct radiocarbon dating for one of the most important human burials in Eurasia, the Sungir site in eastern Europe. Eighteen14C dates were produced before early 2014 on three skeletons (Sungir 1–3), and there is still no consistency in the results. In the absence of other independent methods to establish the antiquity of Sungir, a careful analysis is performed of the site's stratigraphy, paleoenvironment, and14C dates run on animal bones from the same layer as the burials. Although the conclusions of this work cannot be guaranteed to be absolutely correct, we suggest that at the present stage of research the age range of ∼26,000–27,210 BP is the most probable time for the creation of the elaborate human burials at the Sungir site.

scholarly journals ЭТАПЫ ФУНКЦИОНИРОВАНИЯ ПОСЕЛЕНИЯ БРОНЗОВОГО ВЕКА ЛЕВОБЕРЕЖНОЕ (СИНТАШТА II) В ЗАУРАЛЬЕ (ХРОНОЛОГИЧЕСКИЙ АСПЕКТ)

2020 ◽  
Author(s):  
A. Epimakhov ◽  
◽  
F. Petrov ◽  
◽  
Keyword(s):  
Bronze Age ◽  
Radiocarbon Dating ◽  
Final Part ◽  
Cultural Layer ◽  
Radiocarbon Dates ◽  
Preliminary Results ◽  
The Bronze Age

The work presents the preliminary results of serial radiocarbon dating of the Bronze Age settlement Levoberezhnoe (Sintashta II) in the Southern Trans-Urals. 12 radiocarbon dates were obtained using AMS-technology. Their values are clearly divided into two groups: Sintashta and Petrovka (20–18 centuries cal BC) and the final part of the Bronze Age (14–11 centuries cal BC). In addition, a single date for the Cherkaskul cultural layer was obtained. The area of the settlement was exploited (apparently, with interruptions) by bearers of different archaeological traditions throughout the entire 2nd millennium cal BC.

Barriers to Physical Activity in Adolescents

2015 ◽  
Vol 23 (2) ◽  
pp. 47-59 ◽  
Author(s):  
Nadine Langguth ◽  
Tanja Könen ◽  
Simone Matulis ◽  
Regina Steil ◽  
Caterina Gawrilow ◽  
...  
Keyword(s):  
Physical Activity ◽  
Leisure Activities ◽  
Outcome Expectations ◽  
Multidimensional Approach ◽  
Factor Analyses ◽  
Physical And Mental Health ◽  
Tailored Interventions ◽  
Long Term Consequences ◽  
Age Range

During adolescence, physical activity (PA) decreases with potentially serious, long-term consequences for physical and mental health. Although barriers have been identified as an important PA correlate in adults, research on adolescents’ PA barriers is lacking. Thus reliable, valid scales to measure adolescents’ PA barriers are needed. We present two studies describing a broad range of PA barriers relevant to adolescents with a multidimensional approach. In Study 1, 124 adolescents (age range = 12 – 24 years) reported their most important PA barriers. Two independent coders categorized those barriers. The most frequent PA barriers were incorporated in a multidimensional questionnaire. In Study 2, 598 adolescents (age range = 13 – 21 years) completed this questionnaire and reported their current PA, intention, self-efficacy, and negative outcome expectations. Seven PA barrier dimensions (leisure activities, lack of motivation, screen-based sedentary behavior, depressed mood, physical health, school workload, and preconditions) were confirmed in factor analyses. A multidimensional approach to measuring PA barriers in adolescents is reliable and valid. The current studies provide the basis for developing individually tailored interventions to increase PA in adolescents.

Primary Calvarial Ewing Sarcoma: A Case Series

2021 ◽  
Author(s):  
Sandeep Mohindra ◽  
Manjul Tripathi ◽  
Aman Batish ◽  
Ankur Kapoor ◽  
Ninad Ramesh Patil ◽  
...  
Keyword(s):  
Ewing Sarcoma ◽  
Tumor Resection ◽  
Case Series ◽  
Radical Excision ◽  
Term Outcome ◽  
Long Term Outcome ◽  
Intradural Tumor ◽  
Age Range

Abstract Background Calvarial Ewing tumor is a relatively rare differential among bony neoplasms. We present our experience of managing primary calvarial Ewing sarcoma (EWS), highlighting their clinical and radiological findings. Method In a retrospective analysis, we evaluated our 12-year database for pathologically proven EWS. A literature search was conducted for the comparative presentation and update on the management and outcome. Result From January 2008 to December 2020, we managed eight patients (male:female = 5:3; age range 6 months to 19 years, mean 11.5 years) harboring primary calvarial EWS. All cases underwent wide local excision; two patients required intradural tumor resection, while one required rotation flap for scalp reconstruction. Mean hospital stay was 8 days. All patients received adjuvant chemo- and radiotherapy. Three patients remained asymptomatic at 5 years of follow-up, while two patients died. Conclusion Primary calvarial EWS is a rare entity. It usually affects patients in the first two decades of life. These tumors can be purely intracranial, causing raised intracranial pressure symptoms, which may exhibit rapidly enlarging subgaleal tumors with only cosmetic deformities or symptoms of both. Radical excision followed by adjuvant therapy may offer a favorable long-term outcome.

Evaluation attempt of own body sensing amongst persons with and without scoliosis

2021 ◽  
pp. 1-6
Author(s):  
Elżbieta Szczygieł ◽  
Agata Gigoń ◽  
Izabela Cebula Chudyba ◽  
Golec Joanna ◽  
Golec Edward
Keyword(s):  
Idiopathic Scoliosis ◽  
Sensory Integration ◽  
Head Position ◽  
Clinical Test ◽  
Spine Deformity ◽  
Functional Tests ◽  
Body Proportion ◽  
Average Value ◽  
Age Range

BACKGROUND: Adolescent idiopathic scoliosis (AIS) is a common structural spine deformity affecting 2%–4% of adolescents. Due to the unknown cause of idiopathic scoliosis, its therapy is a long-term and often unsatisfactory process. In the literature, it is often suggested that problems related to the feeling of one’s own body are caused by AIS. OBJECTIVE: The aim of this study was to assess the feeling of one’s own body among children with and without scoliosis on the example of feeling the head position, pelvis shape and balance. METHOD: The research included 62 children: 30 with scoliosis and 25 without diagnosed scoliosis with an age range between 11 to 19 years. The minimum scoliosis value was 7∘ and the maximum was 53∘. The average value was 25∘. During the study, three functional tests were used: Cervical Joint Position Error Test (CJPET), Clinical Test of Sensory Integration on Balance (CTSIB) and Body proportion demonstration test (BPDT). RESULTS: The results of the tests showed statistically significant differences (CJPET p= 3.54* 10-14, CTSIB p= 0.0376, BPDT p= 0.0127). However, none of the studies showed a correlation between the results of people with scoliosis and the value of their Cobb angles.

Long-term flat-field behavior on LLNL streak cameras: preliminary results

1991 ◽  
Author(s):  
Jeffrey A. Hatch ◽  
David S. Montgomery ◽  
John A. Prior
Keyword(s):  
Preliminary Results ◽  
Field Behavior ◽  
Flat Field
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