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2,288 results for “periodicals”
Propagation of optical pulses through a periodic dielectric structure (Bragg Grating) designed as a delay line interferometer. Example of a designed fiber Bragg grating.
<p>Propagation of optical pulses through a periodic dielectric structure (Bragg Grating) designed as a delay line interferometer. <br> <br> A 9 cm fiber Bragg grating is designed (and fabricated) for this purpose.</p> <p>The top video shows the simulated propagation of a single optical pulse.</p> <p>The bottom video shows the simulated propagation of a sequence of optical pulses, with relative pi-phase shifts in the last pulse, showing both constructive and destructive interferences effect</p>
Quasi-periodic Gaussian process rotation period posterior samples of Kepler light curves.
<p>.h5 files containing light curves, hyperparameter priors, period priors and posterior samples for the QP-GP rotation period model in Angus, Morton, Aigrain, Foreman-Mackey & Rajpaul (2017). </p> <p>koi_results_02_15.tgz contains posterior samples for 1132 Kepler objects of interest.</p> <p>results_acfprior_02_16.tgz contains posterior samples for 998 simulated light curves (previously published in Aigrain et al., 2015: https://arxiv.org/abs/1504.04029) with an ACF-based prior.</p> <p>results_noprior_02_16.tgz contains posterior samples for 997 simulated light curves (previously published in Aigrain et al., 2015) with an uninformative prior.</p> <p>To load the samples in python:</p> <p>>>> df = pd.read_hdf("<filename>", key="samples")</p> <p>>>> ln_period_samples = df.ln_period</p> <p>>>> ln_A_samples = df.ln_A</p> <p>>>> ln_l_samples = df.ln_l</p> <p>>>> ln_G_samples = df.ln_G</p> <p>>>> ln_sigma_samples = df.ln_sigma</p> <p> </p>
Quasi-periodic Gaussian process rotation period posterior samples (with an uninformative prior) for 998 simulated Kepler light curves.
<p>997.h5 files containing light curves, hyperparameter priors, period priors and posterior samples for the QP-GP rotation period model in Angus, Morton, Aigrain, Foreman-Mackey & Rajpaul (2017).</p> <p>997 .png light curve images.</p> <p>To load the samples in python:</p> <p>>>> df = pd.read_hdf("1.h5", key="samples")</p> <p>>>> ln_period_samples = df.ln_period</p> <p>>>> ln_A_samples = df.ln_A</p> <p>>>> ln_l_samples = df.ln_l</p> <p>>>> ln_G_samples = df.ln_G</p> <p>>>> ln_sigma_samples = df.ln_sigma</p> <p> </p>
Quasi-periodic Gaussian process rotation period posterior samples (with an ACF prior) for 998 simulated Kepler light curves.
<p>998.h5 files containing light curves, hyperparameter priors, period priors and posterior samples for the QP-GP rotation period model in Angus, Morton, Aigrain, Foreman-Mackey & Rajpaul (2017).</p> <p>998 .png light curve images.</p> <p>To load the samples in python:</p> <p>>>> df = pd.read_hdf("1.h5", key="samples")</p> <p>>>> ln_period_samples = df.ln_period</p> <p>>>> ln_A_samples = df.ln_A</p> <p>>>> ln_l_samples = df.ln_l</p> <p>>>> ln_G_samples = df.ln_G</p> <p>>>> ln_sigma_samples = df.ln_sigma</p>
Uribe-Rivera et al 2017 DataSet: High resolution bioclimatic layers for southwest of South America for three recent past periods (1970, 1990 and 2010)
<p>These files were generated as part of the article "Dispersal and extrapolation on the accuracy of temporal predictions from distribution models for the Darwin’s frog" (Uribe-Rivera et al. 2017; accepted in Ecological Applications)</p> <p>We used point data of meteorological stations between 34°-48°S and 70°-75°W, to generate new climatic surfaces for three recent past periods (1970; 1990; 2010). Meteorological data encompassed 293 weather stations, and were extracted from three databases: Dirección Meteorológica de Chile (DMC); Dirección General de Aguas de Chile (DGA); and the FAOClim-NET Agroclimatic database management system (FAO 2001), recording monthly records of mean daily minimum temperature, mean daily maximum temperature and total rainfall for 5-year periods (1965-1969 for 1970 climatic conditions; 1985-1989 for 1990 climatic conditions; and 2005-2009 for 2010 climatic conditions). For each period monthly mean values of each climatic variable were interpolated to generate surfaces using Anusplin v.4.4 (Hutchinson and Xu 2006), which applies the same algorithm used to derive the WorldClim bioclimatic surfaces (Hijmans et al. 2005). Interpolations were fitted following Pliscoff et al. (2014) at a ~1x1 Km resolution, with elevation as an independent variable using the GTOPO30 global digital elevation model (USGS, 1996). Because some weather stations do not have information for every month, we used the option of non-data of Anusplin. The quality of interpolations of climatic data was assessed calculating the Pearson correlation coefficient at the cell level between the monthly climatic values from the CRU-TS v3.10.01 Historic Climate Database for GIS (Climatic Research Unit - Time Series, 2012), and the monthly climatic values from the new climatic layers. Finally, surfaces of 19 bioclimatic variables were generated using the dismo package in R (Hijmans et al. 2014).</p> <p>All bioclimatic layers were uploaded in a single compressed ZIP file. Individual layers can be found inside it as georeferenced ASCII raster files, and nominated primarily by time period, and secundarily by the number of bioclimatic layer, following the worldclim nomenclature (http://www.worldclim.org/bioclim).</p>
Low-Amplitude Textures Explored with the Bare Finger: Roughness Judgments Follow an Inverted U-Shaped Function of Texture Period Modified by Texture Type
<p>Roughness is probably the most salient dimension pertaining to the perception of textures by touch and has been widely investigated. There is a controversy on how roughness relates to the texture’s spatial period and which factors influence this relation. Here, roughness during bare finger exploration of coarse textures is studied for different types of textures with elements of low height (0.3 mm). Participants were presented with square-wave gratings that were defined along one dimension and sine-wave gratings that were defined along one or two dimensions. Textures of each type varied in their spatial half period between 0.25 and 5.17 mm. Participants explored the textures by a lateral movement or a stationary finger contact. In all conditions judged roughness increased with spatial period up to a peak roughness and then decreased again. The exact function depended on the texture type, but hardly on exploration mode. We conclude that roughness is an inverted U-shaped function of texture period, if the textures are of low amplitude. The effects are explained by the interplay of two components contributing to the spatial code to roughness: variability in skin deformation due to the finger’s intrusion into the texture, which increases with the textures’ period up to a maximum (when the skin contacts the texture’s ground), and variability associated with the spatial frequency of the deformation, which decreases with spatial period.</p> <p><strong>Drewing</strong>, K. (2016). Low-Amplitude Textures Explored with the Bare Finger: Roughness Judgments Follow an Inverted U-Shaped Function of Texture Period Modified by Texture Type. <em>Haptics: Perception, Devices, Control, and Applications </em>(pp. 206-217). Springer: Heidelberg.</p> <p> </p> <p>The file DataPerTrialAndVp_Zenodo.txt contains all data relative to the publication.</p> <p>A description of the variables is contained in the file VARIABLE_CODES.txt</p>
Index der Nachrichten aus der Brüdergemeine. Teil 1: Gemein-Nachrichten (ab 1765). Teil 2: Nachrichten aus der Brüder-Gemeine (1819-1894). Teil 3: Periodical Accounts (1790-1965). Teil 4: Beyträge zur Erbauung aus der Brüder-Gemeine (1817 und 1818). Teil 5: Mitteilungen aus der Brüdergemeine (1895-1941). Teil 6: Statistik.
<p>Mit den <em><strong>Gemein-Nachrichten</strong></em> stellt das Unitätsarchiv Herrnhut der weltweiten Evangelischen Brüder-Unität - Herrnhuter Brüdergemeine (Unitas Fratrum / Moravian Church) das älteste und umfangreichste Mitteilungsblatt der Brüdergemeine digital zur Verfügung. Es enthält Berichte aus Gemeinden sowie dem Missions- und Diasporawerk der Brüdergemeine sowie Reden und Lebensläufe. Die <em>Gemein-Nachrichten</em> wurden ab 1765 in Fortsetzung des <em>Jüngerhaus-Diariums</em> (1747-1764) ausschließlich handschriftlich vervielfältigt.</p> <p>In Druck gingen ab 1790 die englischsprachigen <strong><em>Periodical Accounts</em></strong>, zwischen 1817 und 1818 die <strong><em>Beyträge zur Erbauung aus der Brüder-Gemeine</em></strong> und zwischen 1819 und 1894 die <strong><em>Nachrichten aus der Brüder-Gemeine</em></strong>. Das Nachrichtenblatt fand in den <strong><em>Mitteilungen aus der Brüder-Gemeine zur Förderung christlicher Gemeinschaft</em></strong> ab 1895 bis 1941 seine Fortsetzung.</p> <p>Der hier vorliegende <strong>Index</strong> schließt die <strong>Nachrichten aus der Brüdergemeine</strong> auf und verlinkt, wenn möglich, die Primärdigitalisate. Die Indizierung erfolgt im und für das Projekt <a href="https://tu-dresden.de/gsw/virtuos/joker4/digitalherrnhut">#DigitalHerrnhut</a> in virTUos (Virtuelles Lehren und Lernen an der TU Dresden im Open Source-Kontext), von 2021 bis 2025 gefördert von der Stiftung Innovation in der Hochschullehre, und im Rahmen des <a href="https://dhh.hypotheses.org/" target="_blank" rel="noopener">Moravian Knowledge Network</a>.</p> <p>Ab der Version v14 (12.09.2025) ist der <strong>Index gegliedert und deutlich erweitert</strong> und kann entsprechend zitiert werden:</p> <p>Teil 1: Gemein-Nachrichten (ab 1765)<br>Teil 2: Nachrichten aus der Brüder-Gemeine (1819-1894)<br>Teil 3: Periodical Accounts (1790-1965) (in Bearbeitung)<br>Teil 4: Beyträge zur Erbauung aus der Brüder-Gemeine (1817 und 1818)<br>Teil 5: Mitteilungen aus der Brüdergemeine (1895-1941) (in Vorbereitung)<br>Teil 6: Statistik</p>
Tracing the evolution of short-period binaries with super-synchronous fast-rotators
<p>Dataset for the triple scenario (see Sec. 5 in Britavskiy et al.)<br><br>*_triple.txt contain zero age main sequence triple configurations compatible with the "triple merger scenario" described in the paper.<br>*.npy are binary version of the corresponding txt for faster loading. <br><br>The txt files where generated with <a href="https://zenodo.org/api/records/10028333/draft/files/ML_stability.py/content">ML_stability.py.</a> <br><a href="https://zenodo.org/api/records/10028333/draft/files/plot_P_unstable.py/content">plot_P_unstable.py</a> generates fig. 10 and <a href="https://zenodo.org/api/records/10028333/draft/files/plot_min_a_in.py/content">lot_min_a_in.py</a> fig. 9, the other python files are libraries of functions called by these.<br><a href="https://zenodo.org/api/records/10028333/draft/files/mlp_model_trip_ghost.pkl/content">mlp_model_trip_ghost.pkl</a> is the dynamical stability classifier from <a href="https://ui.adsabs.harvard.edu/abs/2023MNRAS.525.2388V/abstract">Vynatheya et al. 2023</a> (ghost orbit method), used by <a href="https://zenodo.org/api/records/10028333/draft/files/classify_trip.py/content">classify_trip.py</a> to determine the probability of dynamical stability of a given system.</p>
The effect of climate change on forest fire danger and severity in the Canadian boreal forests for the period 1976-2100
<p>There are 5 files uploaded.</p><p> </p><p>(1) fwi26.txt.gz, RCP26</p><p>(2) fwi45.txt.gz, RCP45</p><p>(3) fwi85.txt.gz, RCP85</p><p>(4) msk20231028.txt</p><p>(5) Shape_Canadian_Boreal_Forests.7z</p><p> </p><p>mask20231028.txt is an ascii file covering the Canadian Boreal Forests.</p><p>This file can be imported into GisMAP to generate a mask raster.</p><p> </p><p>Shape_Canadian_Boreal_Forests.7z is a compressed shape file cover the</p><p>Canadian Boreal Forests.</p><p> </p><p>fwi26.txt.gz, fwi45.txt.gz, and fwi85.txt.gz are the zipped file of FFMC</p><p>and DSR daily surfaces. There are 6 fields in the files:</p><p> </p><p>Field 1: row number in the mask file of mask20231028.txt.</p><p>Field 2: column number.</p><p>Field 3: Years; 1, 2, 3, ... 95 correspoind to 2006, 2007, 2008, ..., 2100.</p><p>Field 4: Days; 1, 2, 3, ..., 365 in a year.</p><p>Field 5: Daily FFMC values.</p><p>Field 6: Daily DSR values. </p>
Greening and Water Use Efficiency (WUE) during a period of high frequency of droughts in the Brazilian Semi-arid
<p>DATA DESCRIPTION</p><p>E = evaporation (mm)</p><p>Et = transpiration (mm)</p><p>GPP (Gross Primary Productivity) (kg C/m<strong>2 </strong>d-1)</p><p>LAI (Leaf Area Index) (m2 leaf m-2)</p><p>PR (Precipitation) (mm)</p><p>WUE (Water Use Efficiency) (kg C/m<strong>2 </strong>d-1 mm-1)</p><p>Areas of study</p><p>CAR = Cariri</p><p>GLO =Gloria</p><p>MAD Madre de Deus</p><p>P7C = Parque 7 Cidades</p><p>PETRO = Petrolina</p><p>TAL = Serra Talhada</p><p>TRI = Triunfo</p><p>XINGO = Xingo</p><p>D = dry season</p><p>R = rainy season</p><p>Months initial</p><p> </p>
Data: On the role of water table depth, and urban and vegetation cover on groundwater dry period susceptibility
Open the record for dataset details and reuse information.
Lorica Segmentata of the latest period of Empire
My 3D project made in Maya 2020 and textured in Substance Painter. This is a part of the project called "The Fall of Roman Empire". Rendered in Arnold. Source: Objaverse 1.0 / Sketchfab
Marksville-period Kent point
Substantial atlatl point knapped from local chert. Marksville period or before, c. 100 BCE-400 CE. Found in Tensas Parish, Louisiana 58mm x 18mm, 5.2g ~200 x Sony a7ii 24.3MP RAWs. f/16, ISO 1250 BP_02 Source: Objaverse 1.0 / Sketchfab
Surrogate money of the Soviet period (1921).
Private metal surrogate coin. Denomination: Five shares - 50 hundredths of a pound of bread. Issuer: Natural Settlement Union "Reason and Conscience" (provincial organization of the type of production and consumer cooperation, Kiev). Obverse: the motto "PUD BREAD - RUBLES OF LABOR" and the inscription on the circumference: NATURAL-CALCULATING UNION "REASON AND CONSCIENCE". Reverse: in the center - a digital, and around the circumference - a textual expression of the face value: "Five shares - fifty hundredths of a pound of bread". Material: brass. Size: 19 mm. Суррогатные деньги советского периода (1921). Частная металлическая суррогатная монета. Номинал: Пять паев – 50 сотых пуда хлеба. Эмитент: Натурально-расчетный союз "Разум и совесть" (губернская организация типа производственно-потребительской кооперации, Киев). Аверс: девиз «ПУД ХЛЕБА - РУБЛЬ ТРУДА» и надпись по окружности: НАТУРАЛЬНО-РАСЧЕТНЫЙ СОЮЗ «РАЗУМ И СОВЕСТЬ». Source: Objaverse 1.0 / Sketchfab
Egyptian Scarab — 2nd Intermediate Period
Egyptian 2nd Intermediate Period Scarab This is an actual 3D scan of an Egyptian royal scarab from the Second Intermediate Period. The Deshret Crowns facing each other at top indicate the person whom this scarab represents ruled over Lower Egypt. (North) The winged sun symbol in the middle is a typical sign of royalty in Egypt, Israel, Babylon, Assyrian, and other cultures in the Ancient Near East. — Egypt ca. 1650-1550BC Source: Objaverse 1.0 / Sketchfab
Statue d'époque romaine / Statue roman period
The 3D scan of this statuette from the Roman period is generated by the 3DF Zephyr v5.000 photogrammetry program from 157 photos It is kept at the [Musée d'Histoire de Marseille]https://www.musee-histoire-marseille-voie-historique.fr/fr/visit/places). La numérisation 3D de cette statuette d'époque romaine est générée par le programme de photogrammétrie 3DF Zephyr v5.000 à partir de 157 photos Elle est conservée au Musée d'Histoire de Marseille. Source: Objaverse 1.0 / Sketchfab
A decade of short-period earthquake rupture histories from multi-array back-projection
<p>Data Set S1: *.bp files containing the short-period earthquake rupture patterns, energy radiated maps, and source time functions.</p> <p>Data Set S2: Earthquake source information and rupture parameter estimates in machine-readable format (*.csv file) based on visually determined rupture end times.</p> <p>Data Set S3: Rupture parameter estimates in machine-readable format (*.csv file) based on automatic rupture end times.</p>
Effect of changing precipitation in different periods on precipitation use efficiency in a semi-arid grassland
<p>Climate change intensifies global and regional water cycles, leading to changes in both the magnitude and timing of precipitation. Precipitation use efficiency (PUE) plays a crucial role in measuring the response of above-ground net primary productivity (ANPP) to precipitation changes. However, little is known about how changes in precipitation during different periods affect PUE. Using a manipulation precipitation experiment in a semi-arid steppe, we simulated a 60% increase and decrease in precipitation during the early (April-June), late (July-September), and entire (April-September) growing seasons across 2015-2021 to examine the effects of changes in precipitation timing on PUE. The results showed that: (1) decreased precipitation in the late growing season (DLP) and whole growing season (DWP) stimulated PUE by an average of 0.14 and 0.12 g m<sup>-2</sup> mm<sup>-1</sup> yr<sup>-1</sup>, respectively, whereas increased precipitation in the late growing season (ILP) and whole growing season (IWP) suppressed PUE by an average of 0.11 and 0.09g m<sup>-2</sup> mm<sup>-1</sup> yr<sup>-1</sup>, respectively. By contrast, neither decreased nor increased precipitation in the early growing season affected PUE; (2) the increased PUE under DLP was primarily attributed to the increase of PUE in grass (GR) and annuals and biennials (AB), whereas the elevation of PUE under DWP was mainly due to an increase of PUE in AB. By contrast, the reduction of PUE under ILP was mainly caused by a decline of PUE in GR; (3) changes in evapotranspiration and leaf dry matter content (LDMC) explained the variation of PUE in AB while changes of PUE in GR was mainly due to the alteration of soil water content and LDMC. These results suggest that precipitation during the late growing season has a crucial influence on PUE, highlighting the importance of evapotranspiration and leaf dry matter content in regulating ecosystem productivity in the semi-arid steppe.</p>
Habitat simplification affects functional group structure along with taxonomic and phylogenetic diversity of temperate-zone ant assemblages over a ten-year period
<p>Biodiversity is declining at various scales due to habitat simplification. Nevertheless, there is scarce information on how the biotic and abiotic changes linked to simplification affect several diversity dimensions, such as taxonomic, functional, and phylogenetic diversities. This study investigated whether transforming natural oak forests into induced grasslands affected species diversity, functional group structure, and phylogenetic diversity of ant assemblages inhabiting a temperate forest in central Mexico. We placed over 1,000 pitfall traps in five sampling events covering a ten-year period. We used Hill numbers to evaluate species diversity differences between vegetation types and patterns over time. Ant species were classified into stress-related functional groups, which were analyzed for their association with vegetation types and changes to their proportional abundance over time. We calculated the standardized effect size of the mean nearest taxon distance to quantify the evolutionary history and test for non-random patterns within vegetation types and sampling years. Species richness did not differ between vegetation types, yet grasslands showed greater diversity for the q=1 and q=2 orders. Besides, we found three ant species as bioindicators for each vegetation. Regarding functional structure, cold climate specialists were associated with oak forests. In contrast, generalist species were predominant in induced grasslands. Higher phylogenetic diversity with an overdispersed structure was associated with oak forest, whereas lower phylogenetic diversity and a clustered pattern were found in induced grassland. These results indicate that habitat simplification may not affect the number of ant species but rather increases their relative abundance and reorganizes the functional and phylogenetic structure in the ecosystem, particularly shift towards the dominance of evolutionary close-related species and broad-stress tolerant groups. These results highlight the importance of integrating further dimensions of diversity to properly evaluate the reassembly dynamics after habitat simplification and understand the mechanisms driving this biodiversity loss.</p>
Ambient noise from the atmosphere within the seismic hum period band: A case study of hurricane landfall
<p>Spectral analysis results, synthetic Green's functions, and seismic modeling results of this study.</p> <p>This work can be found at GitHub: <a href="https://github.com/NickJi98/Atm_Noise_2024_EPSL.git">https://github.com/NickJi98/Atm_Noise_2024_EPSL.git</a></p>
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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.
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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.