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228 results for “Volumetric”
Data from: Estimating body mass of free-living whales using aerial photogrammetry and 3D volumetrics
1. Body mass is a key life history trait in animals. Despite being the largest animals on the planet, no method currently exists to estimate body mass of free-living whales. 2. We combined aerial photographs and historical catch records to estimate the body mass of free-living right whales (Eubalaena sp.). First, aerial photogrammetry from unmanned aerial vehicles was used to measure the body length, width (lateral distance) and height (dorso-ventral distance) of free-living southern right whales (E. australis; 48 calves, 7 juveniles and 31 lactating females). From these data, body volume was estimated by modelling the whales as a series of infinitely small ellipses. The body girth of the whales was next calculated at three measurement sites (across the pectoral fin, the umbilicus and the anus) and a linear model was developed to predict body volume from the body girth and length data. To obtain a volume-to-mass conversion factor, this model was then used to estimate the body volume of eight lethally caught North Pacific right whales (E. japonica), for which body mass was measured. This conversion factor was consequently used to predict the body mass of the free-living whales. 3. The cross-sectional body shape (height-width ratio) of the whales was slightly flattened dorso-ventrally at the anterior end of the body, almost circular in the mid region, and significantly flattened in the lateral plane across the posterior half of the body. Compared to a circular cross-sectional model, our body mass model incorporating body length, width and height improved mass estimates by up to 23.6% (mean=6.1%, SD=5.27). Our model had a mean error of only 1.6% (SD=0.012), compared to 9.5% (SD=7.68) for a simpler body length-to-mass model. The volume-to-mass conversion factor was estimated at 754.63kg m-3 (SD=50.03). Predicted body mass estimates were within a close range of existing body mass measurements. 4. We provide a non-invasive method to accurately estimate body mass of free-living whales while accounting for both their structural size (body length) and relative body condition (body width). Our approach can be directly applied to other marine mammals by adjusting the model parameters (body mass model script provided).
VOLUMETRIC ABSORPTIVE MICROSAMPLING OF BLOOD (VAMS) FOR UNTARGETED LIPIDOMICS
<p>In the present, proof-of-concept paper, we explore the potential of one common solid support for blood microsampling (dried blood spot, DBS) and a recently developed device (volumetric absorptive microsampling, VAMS) for the untargeted lipidomic profiling of human whole blood, performed by high-resolution LC-MS/MS. Dried blood microsamples obtained by means of DBS and VAMS were extracted with different solvent compositions and compared with fluid blood to evaluate their efficiency in profiling the lipid chemical space in the most wide way. Although more effort is needed to better characterize this approach, our results indicate that VAMS is a viable option for untargeted studies and its use will bring all the corresponding known advantages, like, for example, haematocrit independence, in the field of lipidomics. </p>
Data from: Body mass estimates of an exceptionally complete Stegosaurus (Ornithischia: Thyreophora): comparing volumetric and linear bivariate mass estimation methods
Body mass is a key biological variable, but difficult to assess from fossils. Various techniques exist for estimating body mass from skeletal parameters, but few studies have compared outputs from different methods. Here, we apply several mass estimation methods to an exceptionally complete skeleton of the dinosaur Stegosaurus. Applying a volumetric convex-hulling technique to a digital model of Stegosaurus, we estimate a mass of 1560 kg (95% prediction interval 1082–2256 kg) for this individual. By contrast, bivariate equations based on limb dimensions predict values between 2355 and 3751 kg and require implausible amounts of soft tissue and/or high body densities. When corrected for ontogenetic scaling, however, volumetric and linear equations are brought into close agreement. Our results raise concerns regarding the application of predictive equations to extinct taxa with no living analogues in terms of overall morphology and highlight the sensitivity of bivariate predictive equations to the ontogenetic status of the specimen. We emphasize the significance of rare, complete fossil skeletons in validating widely applied mass estimation equations based on incomplete skeletal material and stress the importance of accurately determining specimen age prior to further analyses.
Dataset for: Tomographic Volumetric Additive Manufacturing of Silicon Oxycarbide Ceramics
<p>Ceramics are highly technical materials with properties of interest for multiple industries. Precisely because of their high chemical, thermal, and mechanical resistance, ceramics are difficult to mold into complex shapes. A possibility to make convoluted ceramic parts is to use preceramic polymers (PCP) in liquid form. The PCP resin is first solidified in a desired geometry and then transformed into ceramic compounds through a pyrolysis step that preserves the shape. Light-based additive manufacturing (AM) is a promising route to achieve solidification of the PCP resin. Different approaches, such as stereolithography, have already been proposed but they all rely on a layer-by-layer printing process which sets limitations on the printing speed and object geometry.<br> Here, we report on the fabrication of complex 3D centimeter-scale ceramic parts by using tomographic volumetric printing which is fast, high resolution and offers a lot of freedom in terms of geometrical design compared to state-of-the-art AM techniques. First, we formulated a photosensitive preceramic resin that was solidified by projecting light patterns from multiple angles. Then, the obtained 3D printed parts were converted into ceramics by pyrolysis. We demonstrate the strength of this approach through the fabrication of dense microcomponents exhibiting overhangs and hollow geometries without the need of supporting structures, and characterize their resistance to high heat and harsh chemical treatments.</p>
In Situ Volumetric Imaging and Analysis of FRESH 3D Bioprinted Constructs Using Optical Coherence Tomography (Data and 3D models)
<p>These files contain 3D models and reconstructions of the 3D printed models after OCT imaging of the brain stem, circle of willis, kidney, vestibular apparatus, mixing network, and resolution text. These are from the journal article "In Situ Volumetric Imaging and Analysis of FRESH 3D Bioprinted Constructs Using Optical Coherence Tomography" published in <em>Biofabrication </em>(2022).</p>
Reservoir Rock Porosity Determining Oil and Gas Reserver Using Volumetric Method
<p>This material has presented on 2nd International Conference on Advanced Research in Engineering and Technology in October 25, 2023.</p>
Stacked Dense Denoise-Segmentation Volumetric Annotations
<p>The volumetric annotations of https://doi.org/10.5281/zenodo.2645838 and https://doi.org/10.5281/zenodo.2645965 used in the Stacked Dense Denoise-Segmentation Network. For the annotation the SuRVoS workbench was used (https://doi.org/10.5281/10.5281/zenodo.247547). We acknowledge Diamond Light Source for the time on I13-2 under proposal mt9396.</p>
Wetting-Induced Volumetric Collapse of UO2 Powder Beds and the Consequence on Transient Nuclear Criticality Excursions
<p>Mathematical and computational models are proposed to simulate wetting-induced volumetric collapse of fissile powder beds. Slumping, nuclear thermal hydraulics, radiolytic gas and steam production models are coupled with point neutron kinetics to investigate transient nuclear criticality excursions in two 5-wt% enriched UO<sub>2</sub> fissile powder beds with varying levels of wetting-induced volumetric collapse. The two beds are distinguished by their mean powder particle size of 30 µm and 100 µm. For the UO<sub>2</sub> powder beds modelled, the re-distribution of UO<sub>2</sub> powder and moderator due to slumping introduced a negative reactivity into the system. This increased the amount of time taken for a delayed critical state to be reached once infiltration began, and also reduced the total fission energy generated over the course of the simulated transient. The total fission energy generated ranged from 42 MJ to 48 MJ 100 seconds after the initial nuclear criticality excursion was observed for the 30 µm sized UO<sub>2</sub> powder bed. The fission energy of the larger sized powder bed (100 µm), varied from 42 MJ to 57 MJ. Larger discrepancies between the slumped and un-slumped initial peak power are predicted. Peak powers varied from 29.2 MW to 106 MW for the smaller-sized powder particles, whereas for larger particles, the peak powers varied from 255 MW to 501 MW.</p>
Positive Pressure and Gravity Affect Volumetric Capnography
ClinicalTrials.gov study NCT03853057. IPD Sharing: NO. Countries: 1. Publications: 2.
Volumetric Magnetic Resonance Imaging in Dementia
ClinicalTrials.gov study NCT05119114. IPD Sharing: NO. Countries: 1. Publications: 4.
Whole Brain Radiotherapy Versus Volumetric Modulated Arc Therapy for Brain Metastases
ClinicalTrials.gov study NCT02220491. IPD Sharing: Not stated. Countries: 1. Publications: 20.
Volumetric Changes in Free Gingival Graft Procedures Taken With Different Techniques
ClinicalTrials.gov study NCT06101524. IPD Sharing: NO. Countries: 1. Publications: 7.
Comparison of a Hyperinflation Mode and Air Stacking on Neuromuscular Patients Under Volumetric Ventilation
ClinicalTrials.gov study NCT02847299. IPD Sharing: Not stated. Countries: 1. Publications: 25.
Volumetrics and Proteomics in Shunted Normal Pressure Hydrocephalus
ClinicalTrials.gov study NCT04785560. IPD Sharing: NO. Countries: 1. Publications: 23.
Changes in Volumetric Hemodynamic Parameters Induced by Fluid Removal on Hemodialysis
ClinicalTrials.gov study NCT02485782. IPD Sharing: Not stated. Countries: 1. Publications: 3.
B-lines Score as Indicator for the Systemic Volumetric Load During TURP
ClinicalTrials.gov study NCT06079177. IPD Sharing: NO. Countries: 1. Publications: 8.
Azelnidipine Anti-Coronary Atherosclerotic Trial in Hypertensive Patients by Serial Volumetric IVUS Analysis(ALPS-J)
ClinicalTrials.gov study NCT00294567. IPD Sharing: Not stated. Countries: 1. Publications: 2.
Volumetric Modulated Arc Therapy (VMAT) for Brain Metastases
ClinicalTrials.gov study NCT01046123. IPD Sharing: Not stated. Countries: 1. Publications: 2.
The Impact of N-Acetylcysteine on Volumetric Retention of Autologous Fat Graft for Breast Asymmetry Correction
ClinicalTrials.gov study NCT03197103. IPD Sharing: NO. Countries: 1. Publications: 2.
Surgical Extrusion: Volumetric and Insertion Analysis at 6 Months.
ClinicalTrials.gov study NCT05201664. IPD Sharing: Not stated. Countries: 1. Publications: 12.
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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)
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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.