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61 results for “20th century”
Data from: Nitrogen content of herbarium specimens from arable fields and mesic meadows reflect the intensifying agricultural management during the 20th century
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Data from: Wildfire activity and land use drove 20th-century changes in forest cover in the Colorado front range
Recent shifts in global forest area highlight the importance of understanding the causes and consequences of forest change. To examine the influence of several potential drivers of forest cover change, we used supervised classifications of historical (1938–1940) and contemporary (2015) aerial imagery covering a 2932‐km2 study area in the northern Front Range (NFR) of Colorado and we linked observed changes in forest cover with abiotic factors, land use, and fire history. Forest cover in the NFR demonstrated broad‐scale changes 1938–2015 and overall cover increased 7.8%, but there was notable spatial variability and many sites also experienced Forest Loss. Recent (1978–2015) wildfire was the largest single driver of Forest Loss, with fires burning 14.3% of the total study area. Recently burned areas showed net losses of 36.9% forest cover. Reasons for Forest Gain were more complex, with elevation, past mining density, fire history, and topographic heat load index being the strongest predictors of increases in forest cover. Historical mining activity is one of the dominant anthropogenic impacts in ecosystems in the NFR and it had a complex, non‐linear relationship with 20th‐century changes in forest cover. Subalpine stands originating after stand‐replacing fires circa mid‐1800s to early 1900s showed some of the greatest gains in forest cover, indicative of slow and continuous post‐fire recovery through the 20th century. We also investigated factors such as land ownership, road density, forest management activities, and development intensity, which played detectable, but more minor roles in observed change. Twentieth‐century changes in forest cover throughout the NFR are a result of ecological disturbances and anthropogenic influences operating at varying timescales and overlaid upon variability in the abiotic environment.
20th Century Fox 3DS Max Remake
goldwyn Source: Objaverse 1.0 / Sketchfab
Data from: Tracking trends in monarch abundance over the 20th century is currently impossible using museum records
[No abstract entered]
Early 20th Century Butter Churn
A butter churn is used to make butter by agitating cream obtained from cow's milk. The "dasher model", seen here, was a popular design favoured by North American settlers. It consists of a container, which holds the cream, and a rod with a wooden x-shaped dasher at the end. This rod is plunged up and down to churn the cream into butter. In this particular churn, the dasher was made out of wood. The barrel is ceramic with a pinkish-gray glaze.<br><br> Note: The model is meant to be viewed in a virtual environment using computer software. You can try printing it off, though we cannot guarantee the quality. To construct your own butter churn please visit ingeniumcanada.org/education/3D-butter-artifacts <br><br> Our terms of use can be found [here](https://ingeniumcanada.org/ingenium/doc/content/cstmc/CSTMC%20terms%20of%20use%203D%20ENG.pdf). Source: Objaverse 1.0 / Sketchfab
Data for: "Possible link between decadal variability in precipitation in the South China Sea and the North Atlantic Oscillation during the 20th century: A perspective from coral geochemical records"
<p>This dataset includes all the data for the paper "Possible link between decadal variability in precipitation in the South China Sea and the North Atlantic Oscillation during the 20th century: A perspective from coral geochemical records" by Cui et al.</p>
MATLAB scripts for reproducing figures in "Atlantic Tropical Cyclones Downscaled from Climate Reanalyses Show Increasing Activity Through the Late 19th and 20th Centuries"
<p>A set of MATLAB scripts that contain the data for all 4 figures of "<strong>Atlantic Tropical Cyclones Downscaled from Climate Reanalyses Show Increasing Activity Through the Late 19<sup>th</sup> and 20<sup>th</sup> Centuries" </strong> and allows the user to plot these data. Please read the very short ReadMe file before using the scripts. </p>
Replication package for: Human Capital, Female Employment, and Electricity: Evidence from the Early 20th-Century United States
<p>The package contains all the code necessary to reproduce the figures and tables in Vidart, D. (forthcoming). "Human Capital, Female Employment, and Electricity: Evidence from the Early 20th-Century United States", Review of Economic Studies. Instructions are also given about accessing the raw data.</p>
20th Century Antarctic sea ice extent anomaly reconstruction by sector
<p>Monthly Antarctic sea ice extent anomaly reconstruction in total and by sector ("Total", "King Haakon VII", "Ross Sea", "East Antarctica", "Weddell Sea", "Bellingshausen Amundsen Sea") for the 20th Century. We provide an ensemble of 2500 reconstructions. </p> <p>For each sector we provide one CSV file. The rows in these data sets correspond the reconstructed month, e.g. reconstructions for January 1950 are found in row "t1950_1" and the columns correspond to the 2500 reconstructions. The numbers of the reconstructions correspond to one another across sectors, such that the 1st "Total" reconstruction is the sum of the 1st reconstruction in all sectors.</p>
Data from: Tracking trends in monarch abundance over the 20th century is currently impossible using museum records
Open the record for dataset details and reuse information.
Data from: Wildfire activity and land use drove 20th-century changes in forest cover in the Colorado front range
Open the record for dataset details and reuse information.
Scaling laws of political regime dynamics: Stability of democracies and autocracies in the 20th-century
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Dataset for "Limnological changes in Lake Victoria since the mid‐20th century"
<p>Dataset of light- (Secchi depth, vertical attenuation coefficient, euphotic depth), physico-chemical- (oxygen saturation, water temperature, specific conductivity, pH) and ecological-parameters (inorganic nutrients, particulate organic carbon, particulate nitrogen and phosphorus, Chlorophyll-a, phytoplankton biomass and composition) obtained from samples collected in Lake Victoria, a large lake in East Africa. Samples were collected in 2018-2019 in nearshore and offshore waters (Uganda), during three contrasting seasons: heavy rains (March), low rains (October) and dry (June), which corresponded to distinct water column mixing regimes, respectively, late-stratified, early-stratified and mixed regimes. Sampling was carried out during day light (between 7 am and 6 pm) in shallow nearshore sites (23, 15 and 16 stations for the mixed, early- and late-stratified seasons, respectively) to deeper offshore (7, 8 and 10) sites. At each sampling site we measured light parameters and we carried out vertical profiles (at a depth interval of 10 m, from the lake surface to the lake bottom) of physico-chemical and ecological parameters. In addition, while traveling between each sampling site we performed continuous measurements of physico-chemical parameters.</p> <p>Please note that the dataset is attached to the following paper :</p> <p>Deirmendjian, L, Descy, J-P, Morana, C, et al. Limnological changes in Lake Victoria since the mid-20<sup>th</sup> century. <em>Freshw Biol</em>. 2021; 66: 1630– 1647. <a href="https://doi.org/10.1111/fwb.13780">https://doi.org/10.1111/fwb.13780</a></p> <p> </p> <p> </p>
Perm Province Periodicals of the Early 20th Century: Between Preservation and Study
<p>3<sup>rd</sup> Project Presentation</p>
Database of Basque reflexives (16th-20th centuries)
<p>A database of Basque reflexives from 16th-20th century texts.</p>
Epidemic History and Iatrogenic Transmission of Blood-borne Viruses in Mid-20th Century Kinshasa
ClinicalTrials.gov study NCT02439918. IPD Sharing: Not stated. Countries: 0. Publications: 5.
SAFARI 2000 Monthly Climatology for the 20th Century (New et al.)
This is a data set of mean monthly surface climate data over Southern Africa for nearly all of the twentieth century. The data set is gridded at 0.5 degree latitude/longitude resolution and includes seven variables: precipitation, mean temperature, diurnal temperature range, wet-day frequency, vapour pressure, cloud cover, and ground-frost frequency. All variables have mean monthly values for the period 1901-1995, several have data as recent as 1998, and more data will be added by the data originators. In constructing the monthly grids the authors used an anomaly approach which attempts to maximize station data in space and time (New et al., 2000). In this technique, grids of monthly historic anomalies are derived relative to a standard normal period. Station measurement data for the years 1961-1990, extracted from the monthly data holdings of the Climatic Research Unit and the Global Historic Climatology Network (GHCN), served as the normal period (New et al., 1999). The anomaly grids were then combined with high-resolution mean monthly climatology to arrive at fields of estimated historical monthly surface climate. Data users are encouraged to see the companion file New et al. (2000) for a complete description of this technique and potential applications and limitations of the data set. For additional information, refer to the IPCC Data Distribution Centre. Access to the complete year-by-year monthly data set or to data more recent than posted here can be achieved by making a request with the Climate Impacts LINK Project at the Climatic Research Unit (email: d.viner@uea.ac.uk, web site: www.cru.uea.ac.uk/link ).
Early 20th century coin (1900)
Monetary unit: penny. Denomination: 3. Year of issue: 1900. St. Petersburg Mint. Material: copper. Ribbed edge. Diameter: 27.9-28.4mm. Circulation: 16 666 667 pieces. Münze des frühen 20. Jahrhunderts (1900). Währungseinheit: Penny. Stückelung: 3. Ausgabe-jahr: 1900. St. Petersburg Mint. Material: Kupfer. Gerippte Kante. Durchmesser: 27,9-28,4 mm. Auflage: 16 666 667 Stück. Денежная единица: копейка. Номинал: 3. Год выпуска: 1900 год. Санкт-Петербургский монетный двор. Материал: медь. Гурт рубчатый. Диаметр: 27,9-28,4 мм. Тираж: 16 666 667 штук. Source: Objaverse 1.0 / Sketchfab
20th Century Fox 1994 Model
muddatkathleen@gmail.com Source: Objaverse 1.0 / Sketchfab
Crane of the 20th century
My 3D model of a Crane. Source: Objaverse 1.0 / Sketchfab
ScienceDex guides
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These curated guides explain access requirements, typical timelines, costs, and reuse considerations for widely used research datasets.
Allen Brain Atlas
Allen Brain Atlas is an Allen Institute collection of brain map atlases, datasets, APIs, and analysis tools covering mouse, human, and non-human primate brain resources.
Annotated Behaviour and Observability Dataset (ABODe)
ABODe is a University of Edinburgh DataShare dataset for behavior classification in group-housed mice using home-cage video, identities, bounding boxes, ground-plate positions, and annotator labels.
DANDI Archive for NWB datasets
DANDI is a BRAIN Initiative archive for publishing and sharing neurophysiology data, including electrophysiology, optophysiology, and behavioral data packaged as NWB and related standards.
International Brain Laboratory public data
The International Brain Laboratory public data releases expose standardized mouse decision-making experiments, including Neuropixels recordings, widefield calcium imaging, behavior, and session metadata accessed through the ONE API.
OpenNeuro
OpenNeuro is a free, open platform for sharing neuroimaging datasets, with public search, dataset pages, and download paths for web, S3, DataLad, and the OpenNeuro CLI.