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215 results for “Periodical Studies”
study of second harmonic generation in periodically poled fiber in double pass configuration
<p>This dataset includes the experimental measurements and the numerical simulations of the power of second harmonic generated inside a periodically poled fiber traversed in single and double pass by a fundamental signal whose wavelength is included in a certain range of values. This measurements are the preliminary study for situation where the PPSF can be exploited in multiple pass configuration, such as in a cavity. </p>
University of Kansas Field Station: Forest demography, 1980 – 2015. On ten study plots established on three management units all live trees with a dbh > 7.5 cm (3 in) were identified to species, measured, and tagged. Trees were initially measured in 1980/1981 and re-measured in three successive time periods: 1993/95; 2002/03; and 2014/15. Trees will be measured again in 2025/26.
In 1980 researchers at the University of Kansas initiated a long-term experiment monitoring the composition of oak-hickory forest communities at the University’s field station near Lawrence, Kansas. The purpose of the study was to determine how forest species composition varied temporally across distinct habitats that varied in topography, elevation, sun exposure, management history and successional stage. Ten permanent sites were sampled approximately each decade with data collection periods of 1980/81, 1993/95, 2002/03, and 2014/15. Trees with a minimum diameter at breast height (dbh) of ≥ 7.5 cm were tagged, identified to species and measured. Trees will be measured again in 2025/26.
Pond Area Estimates: Nine Study Regions in Alaska for 3 time periods (1950s, 1978-1982, 1999-2001) using remotely sensed images
The data are ArcGIS shapefiles by USGS quadrangle within 9 study regions: Arctic Coastal Plain, Stevens Village area, Yukon Flats, Minto Flats, Denali Flats, Talkeetna, Innoko Flats, Tetlin Flats, and Copper River Basin. Each shapefile polygon represents the shoreline of a pond as visually interpreted from each georectified remotely sensed image. All images were rectified based on at least 25 control points from 1:63 360 USGS digital raster graphics topographic maps using a second-order polynomial with a RMS error of less than one satellite image pixel (30 meters). All closed-basin ponds greater than 0.2 hectares were visually delineated and manually traced as polygons using ArcGIS. Each pond polygon has an ID and Hectares field representing the pond ID and area in hectares for the time period of the remotely sensed image.
Fig. 15. D. latissimus larva, Fig. 16. Dead D in Methodologicalaspects Of Study On Biologyand Development Cycles Of Dytiscus Latissimus (Coleoptera: Dytiscidae) In Laboratory Environment. Spring-Summer Period
Fig. 15. D. latissimus larva, Fig. 16. Dead D.latissimus (male) died during pupation couple of hours after metamorphosis
Fig. 9. Young D in Methodologicalaspects Of Study On Biologyand Development Cycles Of Dytiscus Latissimus (Coleoptera: Dytiscidae) In Laboratory Environment. Spring-Summer Period
Fig. 9. Young D.latissimus imago. Female couple of hours after metamorphosis.: A – immediately after metamorphosis, B – in 6 hours, C – in 24 hours (integuments gained their normal colour).
Fig.6. Instar II larva attacking a in Methodologicalaspects Of Study On Biologyand Development Cycles Of Dytiscus Latissimus (Coleoptera: Dytiscidae) In Laboratory Environment. Spring-Summer Period
Fig.6. Instar II larva attacking a caddis larva (with Fig.7. D. latissimus instar III larva exuvium on its left)
Fig.5. D in Methodologicalaspects Of Study On Biologyand Development Cycles Of Dytiscus Latissimus (Coleoptera: Dytiscidae) In Laboratory Environment. Spring-Summer Period
Fig.5. D. latissimus egg While keeping the larvae one has to also laying inside the stem of consider the fact, that these larvae have an Caltha palustris
Data from: Variations in regional white matter volumetry and microstructure during the post-adolescence period: a cross-sectional study of a cohort of 1,713 university students
<p>Human brain white matter undergoes a protracted maturation that continues well into adulthood. Recent advances in diffusion-weighted imaging (DWI) methods allow detailed characterisations of the microstructural architecture of white matter, and they are increasingly utilised to study white matter changes during development and ageing. However, relatively little is known about the late maturational changes in the microstructural architecture of white matter during post-adolescence. Here we report on regional changes in white matter volume and microstructure in young adults undergoing university-level education. As part of the MRi-Share multi-modal brain MRI database, multi-shell, high angular resolution DWI data were acquired in a unique sample of 1,713 university students aged 18 to 26. We assessed the age and sex dependence of diffusion metrics derived from diffusion tensor imaging (DTI) and neurite orientation dispersion and density imaging (NODDI) in the white matter regions as defined itein the John Hopkins University (JHU) white matter labels atlas. We demonstrate that while regional white matter volume is relatively stable over the age range of our sample, the white matter microstructural properties show clear age-related variations. Globally, it is characterised by a robust increase in neurite density index (NDI), and to a lesser extent, orientation dispersion index (ODI). These changes are accompanied by a decrease in diffusivity. In contrast, there is minimal age-related variation in fractional anisotropy. There are regional variations in these microstructural changes: some tracts, most notably cingulum bundles, show a strong age-related increase in NDI coupled with decreases in radial and mean diffusivity, while others, mainly cortico-spinal projection tracts, primarily show an ODI increase and axial diffusivity decrease. These age-related variations are not different between males and females, but males show higher NDI and ODI and lower diffusivity than females across many tracts. These findings emphasize the complexity of changes in white matter structure occurring in this critical period of late maturation in early adulthood.</p>
A Randomized, Double-Blind, Placebo Controlled, Two-Period Cross-Over, Proof of Activity Study to Evaluate the Effects of TAK-041 on Motivational Anhedonia as Add-On to Antipsychotics in Participants
ClinicalTrials.gov study NCT03319953. IPD Sharing: YES. Countries: 1. Publications: 1.
Data from: Variations in regional white matter volumetry and microstructure during the post-adolescence period: a cross-sectional study of a cohort of 1,713 university students
Open the record for dataset details and reuse information.
Questionnaire Draft and Respons for Study of Online Learning for Accounting Subjects in Vocational School During the Pandemic Period
<p>The questionnaire was designed to be completed by accounting-major vocational school students via an online survey platform. The data collection phase of the survey was conducted in August 2020, to analyze the learning process from March to July 2020. During that time, all schools in Indonesia implemented Study From Home (SFH). The questionnaire has 36 items, divided into 7 sections. Respondents were asked to choose one-point Likert scale from one to five depending on their online learning conditions. </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>
Predicting Properties of Periodic Systems from Cluster Data: A Case Study of Liquid Water
<ul> <li> Description</li> </ul> <p>The 1520 water clusters were extracted from Ref. 1. The respective energies and atomic forces were recomputed at the revPBE-D3/def2-TZVP [2-6], B3LYP-D3/def2-TZVP [4-6, 7, 8], and BLYP-D3/def2-TZVP [4-6, 7, 9] level.</p> <ul> <li> Format</li> </ul> <p>The data is stored in python compressed array format (.npz) with the atomization energy in kcal/mol and atomic forces in kcal/mol/Ang. The data set contains five np.ndarray</p> <pre><code>import numpy as np data = np.load('revpbe.npz') data['R'] # Cartesian coordinates of nuclei in Ang. data['E'] # Total energy in kcal/mol data['F'] # Atomic forces in kcal/mol/Ang. data['N'] # Number of atoms in each structure data['Z'] # Nuclear charges</code></pre> <p>References</p> <ul> </ul> <p>[1] Molpeceres G., Zaverkin V., and Kästner J., “Neural-network assisted study of nitrogen atom dynamics on amorphous solid water – I. adsorption and desorption,” Mon. Not. R. Astron. Soc. 499, 1373 (2020).</p> <p>[2] P. E. Blöchl, “Projector augmented-wave method,” Phys. Rev. B 50, 17953 (1994).</p> <p>[3] Y. Zhang and W. Yang, “Comment on “generalized gradient approximation made simple”,” Phys. Rev. Lett. 80, 890 (1998).</p> <p>[4] S. Grimme, J. Antony, S. Ehrlich, and H. Krieg, “A consistent and accurate ab initio parametrization of density functional dispersion correction (DFT-D) for the 94 elements H-Pu,” J. Chem. Phys. 132, 154104 (2010).</p> <p>[5] F. Weigend and R. Ahlrichs, “Balanced basis sets of split valence, triple zeta valence and quadruple zeta valence quality for H to Rn: Design and assessment of accuracy,” Phys. Chem. Chem. Phys. 7, 3297 (2005).</p> <p>[6] F. Weigend, “Accurate Coulomb-fitting basis sets for H to Rn,” Phys. Chem. Chem. Phys. 8, 1057 (2006).</p> <p>[7] A. D. Becke, “Density-functional thermochemistry. iii. the role of exact exchange,” J. Chem. Phys. 98, 5648 (1993).</p> <p>[8] P. J. Stephens, F. J. Devlin, C. F. Chabalowski, and M. J. Frisch, “Ab initio calculation of vibrational absorption and circular dichroism spectra using density functional force fields,” J. Phys. Chem. 98, 11623 (1994).</p> <p>[9] C. Lee, W. Yang, and R. G. Parr, “Development of the Colle-Salvetti correlation-energy formula into a functional of the electron density,” Phys. Rev. B 37, 785 (1988).</p>
Environmental Reconstructions Based on Aquatic and Terrestrial Snails Originating from the Early Bronze Age and the Late Islamic Period– A Stable Isotope Case Study from the Al-Khashbah Archaeological Site, Sultanate of Oman
<p>Supplementary data for the article: "Environmental Reconstructions Based on Aquatic and Terrestrial Snails Originating from the Early Bronze Age and the Late Islamic Period– A Stable Isotope Case Study from the Al-Khashbah Archaeological Site, Sultanate of Oman"</p>
Fig. 11 in Methodologicalaspects Of Study On Biologyand Development Cycles Of Dytiscus Latissimus (Coleoptera: Dytiscidae) In Laboratory Environment. Spring-Summer Period
Fig. 11. Improvised nursecage for keeping larvae
Dataset for the study Sensitive period for the plasticity of alpha activity in humans
<p>Raw EEG data in european data format (EDF) format. Descriptive and clinical data of the subjects in textual tab delimited format. Columns report for each subject: group (blind/severely impaired, BSI or sighted, S), code, gender, age expressed in decimal years, age bin, degree of visual impairment, diagnosis, motor coordination impairment classification (MCI, 1 = not impaired, 2 = impaired), and hypotonia classification (1 = not impaired, 2 = impaired). NA correspond to undefined classification.</p> <p>Visual experience is crucial for the development of neural processing. For example, alpha activity development is a vision-dependent mechanism. Indeed, studies report no alpha activity is present in blind adults. Nevertheless, studies have not investigated the developmental trajectory of this activity in infants and children with blindness. Here, we hypothesize that the difference in neural activity of blind compared to sighted subjects is: absent at birth, progressive with age, specifically occipital and linked to a gradual motor impairment. Therefore, we consider spectral power of resting-state EEG and its association with motor impairment indices, in blind subjects and in sighted controls between 0 and 11 years of age. Blind subjects show posterior alpha activity during the first three years of life, although weaker and slower maturing compared to sighted subjects. The first great differentiation between blind and sighted subjects occurs between 3 and 6 years of age. Starting in this period, reduced alpha activity increases the probability of motor impairment in blind subjects, likely because of impaired perception/interaction. These results show that visual experience mediates the neural mechanisms generating alpha oscillations during the first years of life, suggesting that it is a sensitive period for the plasticity of this process.</p>
A 2-Period Crossover Study of BPN14770 in Adults Males With Fragile X Syndrome
ClinicalTrials.gov study NCT03569631. IPD Sharing: NO. Countries: 1. Publications: 2.
A Clinical Efficacy and Safety Study of Insulin Glargine U300 in Chinese Adult Patients With Uncontrolled Type 2 Diabetes Mellitus With a 3-month Extension Period
ClinicalTrials.gov study NCT05002933. IPD Sharing: YES. Countries: 1. Publications: 0.
A Study With a Initial Treatment Period Followed by a Randomized-withdrawal Period to Evaluate the Efficacy and Safety of Bimekizumab in Adult Subjects With Moderate to Severe Chronic Plaque Psoriasis
ClinicalTrials.gov study NCT03410992. IPD Sharing: NO. Countries: 9. Publications: 7.
A Phase IV, Open Label, 4-period Cross-over Study to Investigate a Drug Interaction Between Lamivudine and Sorbitol Oral Solutions in Healthy Volunteers
ClinicalTrials.gov study NCT02634073. IPD Sharing: Not stated. Countries: 1. Publications: 1.
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.