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402 results for “ABSOLUTE”
Measurement of Absolute Retinal Blood Flow Using a Laser Doppler Velocimeter Combined with Adaptive Optics
<p><strong>Data set of measurements related to the following:</strong></p> <p><strong>Purpose: </strong>Development and validation of an absolute laser Doppler velocimeter (LDV) based on an adaptive optical fundus camera which provides simultaneously high definition images of the fundus vessels and absolute maximal red blood cells (RBCs) velocity in order to calculate the absolute retinal blood flow.</p> <p><strong>Methods: </strong>This new absolute laser Doppler velocimeter is combined with the adaptive optics fundus camera (rtx1, Imagine Eyes©,Orsay, France) outside its optical wavefront correction path. A 4 seconds recording includes 40 images, each synchronized with two Doppler shift power spectra. Image analysis provides the vessel diameter close to the probing beam and the velocity of the RBCs in the vessels are extracted from the Doppler spectral analysis. Combination of those values gives an average of the absolute retinal blood flow. An in vitro experiment consisting of latex microspheres flowing in water through a glass-capillary to simulate a blood vessel and in vivo measurements on six healthy human retinal venous junctions were done to assess the device.</p> <p><strong>Results: </strong>In the in vitro experiment, the calculated flow varied between 1.75 μl/min and 25.9 μl/min and was highly correlated (r2 = 0.995) with the imposed flow by a syringe pump. In the in vivo experiment, the error between the flow in the parent vessel and the sum of the flow in the daughter vessels was between −25% and 17% (mean±sd −2 ± 17%). Retinal blood flow in the main temporal retinal veins of healthy subjects varied between 1.3 μL/min and 28.7 μL/min</p> <p><strong>Conclusion: </strong>This adaptive optics LDV prototype (aoLDV) allows the measurement of absolute retinal blood flow derived from the retinal vessel diameter and the maximum RBCs velocity in that vessel.</p>
First evaluation of an absolute quantum gravimeter (AQG#B01) for future field experiments
<p>Quantum gravimeters are a promising new development allowing for continuous absolute gravity monitoring while<br> remaining user-friendly and transportable. In this study, we present experiments carried out to assess the capacity of the<br> AQG#B01 in view of future deployment as a field gravimeter for hydro-geophysical applications. The AQG#B01 is the field<br> version follow-up of the AQG#A01 portable absolute quantum gravimeter developed by the French quantum sensor company<br> Muquans. We assess the instrument’s performance in terms of stability (absence of instrumental drift), sensitivity in relation to<br> other gravimeters. Furthermore, the measurements allowed for the successful monitoring of a hydrological mass change. We<br> discuss the observations concerning the accuracy of the AQG#B01 in comparison with a state-of-the-art absolute gravimeter<br> (Micro-g-LaCoste, FG5#228). Repeatability is tested by instrument displacement between close-by measurement positions.<br> We report the repeatability to be better than 50 nm.s−2 . No significant instrumental drift was observed over several weeks<br> of measurement. This study furthermore investigates whether changes of instrument tilt and external temperature and com-<br> bination of both, which are likely to occur during field campaigns, influence the measurement of gravitational attraction. We<br> ◦repeatedly tested external temperatures between 20 and 30 C and did not find any significant effect. We report two weeks<br> of stable operation under semi-terrain conditions in a garage without temperature-control. As an example of a geophysical<br> signal, a 100 nm.s−2 gravity change is detected with the AQG#B01 after a rainfall event at the Larzac geodetic observatory<br> (Southern France). The data agreed with the gravity changes measured with a superconducting relative gravimeter (GWR,<br> iGrav#002) and the expected gravity change simulated as an infinite Bouguer slab approximation. We close with operational<br> recommendations for potential users and discuss specific possible future field applications. While not claiming completeness,<br> we nevertheless present the first characterisation of a quantum gravimeter carried out by future users. Crucial criteria for the<br> assessment of its suitability in field applications have been investigated and are complemented with a discussion of further<br> necessary experiments.</p> <p> </p>
FIGURE 51. Absolute Bremer with implicit weighing k in Taxonomic review and cladistic analysis of Neotropical spider genus Epicratinus Jocqué & Baert, 2005 (Araneae: Zodariidae) with description of eleven new species
FIGURE 51. Absolute Bremer with implicit weighing k = 10.
Dataset for publication "Measurement of the Absolute Phase Error of Digitizers"
<p>This is the dataset related to the paper:</p> <p>G. Crotti, A. D. Femine, D. Gallo, D. Giordano, C. Landi and M. Luiso, "Measurement of the Absolute Phase Error of Digitizers," in <em>IEEE Transactions on Instrumentation and Measurement</em>, vol. 68, no. 6, pp. 1724-1731, June 2019.<br> doi: 10.1109/TIM.2018.2888919</p> <p>Excel file contains the data for Figures 2 and 3.</p>
Dataset for publication "Uncertainty Evaluation on the Absolute Phase Error of Digitizers"
<p>This is the dataset related to the paper</p> <p>Delle Femine, Antonio, Gallo, Daniele, Landi, Carmine, & Luiso, Mario. (2019). Uncertainty Evaluation on the Absolute Phase Error of Digitizers. Transactions of the Institute of Measurement and Control. http://doi.org/10.5281/zenodo.3600435</p> <p>that is identical to</p> <p>A. Delle Femine, D. Gallo, C. Landi, M. Luiso, “Uncertainty evaluation on the absolute phase error of digitizers”, Transactions of the Institute of Measurement and Control, Volume: 42 issue: 4, page(s): 749-758, 01 February 2020, doi: 10.1177/0142331219879836</p> <p> </p> <p> </p> <p>Excel file contains the data for Figures 6, 7, 8, 9.</p>
Data from: Cell wall microstructure, pore size distribution and absolute density of hemp shiv
This paper, for the first time, fully characterises the intrinsic physical parameters of hemp shiv including cell wall microstructure, pore size distribution and absolute density. Scanning Electron Microscopy revealed microstructural features similar to hardwoods. Confocal Microscopy revealed three major layers in the cell wall: middle lamella, primary cell wall and secondary cell wall. Computed tomography improved the visualisation of pore shape and pore connectivity in three dimensions. Mercury intrusion porosimetry showed the average accessible porosity was 76.67 ± 2.03 % and pore size classes could be distinguished into micropores (3-10 nm) and macropores (0.1-1 µm and 20-80 µm). The absolute density was evaluated by helium pycnometry, mercury intrusion porosimetry (MIP) and Archimedes' methods. The results show that these methods can lead to misinterpretation of absolute density. The MIP method showed a realistic absolute density (1.45 g/cm3) consistent with the density of the known constituents: including lignin, cellulose and hemi-cellulose. However, helium pycnometry and Archimedes' methods gave falsely low values due to 10% of the volume being inaccessible pores, which require sample pretreatment in order to be filled by liquid or gas. This indicates that the determination of the cell wall density is strongly dependent on sample geometry and preparation.
Supplement to: Absolute age and temperature of belemnite rostra: constrains on the Early Cretaceous cooling event.
Open the record for dataset details and reuse information.
Fig. 3 in Neolignans from Myristica fragrans seeds, revision of their absolute configurations, reduction products and biological activities
Fig. 3. Experimental and calculated ECD spectra of 1a-4a and 1b–4b.
Fig. 2 in Neolignans from Myristica fragrans seeds, revision of their absolute configurations, reduction products and biological activities
Fig. 2. Experimental and calculated ECD spectra of 1–4.
Fig. 1 in Neolignans from Myristica fragrans seeds, revision of their absolute configurations, reduction products and biological activities
Fig. 1. Structures of neolignans 1–4 and reduction products (1a-4a and 1b–4b).
Absolute sea level changes along the coast of China from tide gauges, GNSS and satellite altimetry
<p>The datasets are used for the study of absolute sea level changes along the coast of China from tide gauges, GNSS and satellite altimetry. There are five folders containing the data of GNSS, tide gauge, land freshwater runoff and the results extraction from AVISO grid products. A data description is included in the datasets.</p>
Dataset: First Trust Alternative Absolute Return Strategy ETF (FAAR) Stock Performance
This dataset provides historical stock market performance data for specific companies. It enables users to analyze and understand the past trends and fluctuations in stock prices over time. This information can be utilized for various purposes such as investment analysis, financial research, and market trend forecasting.
Data for The Absolute Age of Milky Way Globular Clusters
<p>MC isochrones used to estimate the absolute age of 8 Milky Way GCs.</p> <p>Isochrone data for each GC is stored in HDF5 format and compressed. Each file comprises 10000 sets of isochrones with information such as age, mass, magnitude, etc. The stellar evolution parameters used to construct each isochrone can also be found in the file. The HDF5 file can be accessed using tools like python.</p> <p>Detailed instruction to read MC parameters and MC isochrones can be found in the notebook: Instruction on reading isochrones.ipynb</p>
Data from: Sequence entropy of folding and the absolute rate of amino acid substitutions
Adequate representations of protein evolution should consider how the acceptance of mutations depends on the sequence context in which they arise. However, epistatic interactions among sites in a protein result in hererogeneities in the substitution rate, both temporal and spatial, that are beyond the capabilities of current models. Here we use parallels between amino acid substitutions and chemical reaction kinetics to develop an improved theory of protein evolution. We constructed a mechanistic framework for modelling amino acid substitution rates that uses the formalisms of statistical mechanics, with principles of population genetics underlying the analysis. Theoretical analyses and computer simulations of proteins under purifying selection for thermodynamic stability show that substitution rates and the stabilization of resident amino acids (the 'evolutionary Stokes shift') can be predicted from biophysics and the effect of sequence entropy alone. Furthermore, we demonstrate that substitutions predominantly occur when epistatic interactions result in near neutrality; substitution rates are determined by how often epistasis results in such nearly neutral conditions. This theory provides a general framework for modelling protein sequence change under purifying selection, potentially explains patterns of convergence and mutation rates in real proteins that are incompatible with previous models, and provides a better null model for the detection of adaptive changes.
Absolute Sustainability: Beyond LCA and Green Chemistry Metrics
<p>This is a supplementary data to support my application to the Nina McClelland Memorial Award.</p>
ICML Supplement Absolute Times for Uber Tensor
<p>Absolute times for 40 iterations, Uber Tensor</p>
The Absolute Age of M92
<p>10000 sets of isochrones for M92</p>
Fig. 3. Key NOESY correlations for compound 1 in Lanostane triterpenoids from cultivated fruiting bodies of Ganoderma sichuanense: Determination of the C-25 absolute configuration of ganoderic acid A and its derivatives using the phenylglycine methyl ester (PGME) method
Fig. 3. Key NOESY correlations for compound 1.
Fig. 2. COSY and HMBC correlations for compounds 1–3 in Lanostane triterpenoids from cultivated fruiting bodies of Ganoderma sichuanense: Determination of the C-25 absolute configuration of ganoderic acid A and its derivatives using the phenylglycine methyl ester (PGME) method
Fig. 2. COSY and HMBC correlations for compounds 1–3.
Fig. 4 in Lanostane triterpenoids from cultivated fruiting bodies of Ganoderma sichuanense: Determination of the C-25 absolute configuration of ganoderic acid A and its derivatives using the phenylglycine methyl ester (PGME) method
Fig. 4. Δδ-Values (δ(S) – δ(R)) of the PGME amides 25a/25b, 26a/26b, and 27a/27b.
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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.