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277 results for “infrared spectroscopy”
Data from: Charcoal analysis for temperature reconstruction with infrared spectroscopy
<p>The duration and maximum combustion temperature of vegetation fires are important fire properties with implications for ecology, hydrology, hazard potential, and many other processes. Directly measuring maximum combustion temperature during vegetation fires is difficult. However, chemical properties of charcoal formed as a by-product of fire reflect key chemical transformations associated with temperatures. Therefore, they could be used indirectly to determine the maximum combustion temperature of vegetation fires. To evaluate the reliability of charcoal chemistry as an indicator of maximum combustion temperature, we studied the chemical properties of charcoal formed through two laboratory methods at measured temperatures. Using a muffle furnace, we generated charcoal from the woody material of ten different tree and shrub species at seven distinct peak temperatures (from 200 °C to 800 °C in 100 °C increments). Additionally, we simulated more natural combustion conditions by burning woody material and leaves of four tree species in a combustion facility instrumented with thermocouples, including thermocouples inside and outside of tree branches. Charcoal samples generated in these controlled settings were analyzed using Fourier Transform Infrared (FTIR) spectroscopy to characterize their chemical properties. The Modern Analogue Technique (MAT) was employed on FTIR spectra of muffle furnace charcoal to assess the accuracy of inferring maximum pyrolysis temperature. The MAT modeltemperature matching accuracy improved from 46% for all analogues to 81% when including ±100 ℃. Furthermore, we used MAT to compare charcoal created in the combustion facility with muffle furnace charcoal. Our findings indicate that the spectra of charcoals generated in a combustion facility can be accurately matched with muffle furnace-created charcoals of similar temperatures using MAT, and the accuracy improved when comparing the maximum pyrolysis temperature from muffle furnace charcoal with the maximum inner temperature of the combustion facility charcoal. This suggests that charcoal produced in a muffle furnace may be representative of the inner maximum temperatures for vegetation fire-produced charcoals. FTIR spectroscopy is a promising tool for determining maximum fire temperature from charcoals of vegetation and prescribed fires and may have implications for fossil charcoal from palaeoecological records. </p>
Structural Dynamics of an Excited Donor-Acceptor Complex from Ultrafast Polarized Infrared Spectroscopy, Molecular Dynamics Simulations, and Quantum Chemical Calculations
<p>The files contains all the data that are shown in the figures of the article:</p> <p>Rumble, C.; Vauthey, E. Structural Dynamics of an Excited Donor-Acceptor Complex from Ultrafast Polarized Infrared Spectroscopy, Molecular Dynamics Simulations, and Quantum Chemical Calculations. Phys. Chem. Chem. Phys. 21 (2019). 10.1039/C9CP00795D</p>
Molecular factors determining brightness in fluorescence-encoded infrared vibrational spectroscopy
<p>Uploaded to this link are the datasets used for calculating the FEIR activities of the normal modes of ten coumarins studied in this work. We recommend going through the readme file (readme_file.txt), which should guide the reader through the data files.</p>
Fig.1 in Application Of Near-Infrared Reflectance Spectroscopy For Detection Of Acrylamide Content In Potato Crisps And Bread
Fig.1. Predicted acrylamide vs reference acrylamide in bread samples.
Fig.2 in Application Of Near-Infrared Reflectance Spectroscopy For Detection Of Acrylamide Content In Potato Crisps And Bread
Fig.2. Predicted acrylamide vs reference acrylamide in potato crisp samples.
Portable near infrared spectroscopy (NIRS)
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Fig. 4 in Near-infrared spectroscopy and microstructure of the scales of Sabethes (Sabethes) albiprivus (Diptera: Culicidae)
Fig. 4. Localities were the Sabethes albiprivus specimens were collected.
Functional near-infrared spectroscopy visually evoked measurements and Autism Questionnaire score in adults and children
<p><strong>Functional near-infrared spectroscopy (fNIRS) visually-evoked data collected from healthy adults and children. We recruited a total of 40 adult participants (20 women, age: 31.05 ± 3.94 (SD) years) and 19 children (5 girls, age: 7.20 ± 3.01 (SD) years). Adult participants filled in the Autistic-traits Quotient (AQ) questionnaire, a 50-items self-administered report validated for the Italian version. The items consist of descriptive statements assessing personal preferences and typical behavior. Since child self-report might be affected by reading and comprehension difficulties, the children's version of Autism Spectrum Quotient (Italian version of AQ-child) was completed by parents. To measure changes in total Hb (THb) concentration and relative oxygenation levels (OHb and DHb) in the occipital cortex during the task, we used a continuous-wave NIRS system with 8 red light-sources operating at 760 nm and 850 nm, and 7 detectors, forming an array of 22 multi-distant channels. </strong></p> <p> </p> <p><strong>The dataset includes 2 '.zip' files containing artifact-free visually-evoked transients HDF data, exported from Homer 3 (https://github.com/BUNPC/Homer3) in '.txt' format. Subfolders correspond to different stimulation conditions, for details refer to this paper [preprint coming soon].</strong></p> <p><strong>Each txt file is named with the corresponding subject code and contains two events [tagged as 1 (baseline) and 2 (stimulus)]. </strong></p> <p><strong>The file 'annotations.csv' contains the following fields:</strong></p> <p><strong>Code [Subjects id name, that corresponds to the filename in the recording folders]</strong></p> <p><strong>Sex [M or F]</strong></p> <p><strong>Valid [1 or 0, 0 means excluded subject]</strong></p> <p><strong>Age [int]</strong></p> <p><strong>CH_exclude [list of excluded channels]</strong></p> <p><strong>CH_Red [ list of channels that did not passed the calibration step]</strong></p> <p><strong>Category [adult or child] </strong></p> <p><strong>Cartoon_fixed [cartoon name]</strong></p> <p><strong>Cartoon_chosen [cartoon name]</strong></p> <p><strong>AQ [global AQ score] </strong></p> <p><strong>AQ_S [ AQ subscale social ] </strong></p> <p><strong>AQ_C [ AQ subscale communication ] </strong></p> <p><strong>AQ_A [ AQ subscale attention] </strong></p> <p><strong>AQ_D [ AQ subscale detail] </strong></p> <p><strong>AQ_I [ AQ subscale imagination] </strong><br> </p> <p> </p> <p> </p> <p> </p>
Fourier transform infrared spectroscopy as a non-destructive method for analysing herbarium specimens
<p>Dried plant specimens stored in herbaria are an untapped treasure chest of information on environmental conditions, plant evolution and change over many hundreds of years. Due to their delicate nature and irreplaceability, there is limited access for analysis to these sensitive samples, particularly where chemical data is obtained using destructive techniques. Fourier transform infrared spectroscopy (FTIR) is a chemical analysis technique that can be applied non-destructively to understand chemical bonding information and therefore functional groups within the sample. This provides the potential for understanding geographic, spatial and species-specific variation in plant biochemistry. Here we demonstrate the use of mid-FTIR microspectroscopy for the analysis of <em>Drosera</em> <em>rotundifolia</em> herbaria specimens, which were collected 100 years apart from different locations. Principal component and hierarchical clustering analysis enabled successful differentiation between three main regions on the plant (lamina, tentacle stalk and tentacle head), and between the different specimens. Lipids and protein spectral regions were particularly sensitive differentiators of plant tissues. Differences between the different sets of specimens were smaller. This study demonstrates that relevant information can be extracted from herbarium specimens using FTIR, with little impact on the specimens. FTIR therefore provides the potential as a powerful tool to unlock historic information within herbaria.</p>
Infrared action spectroscopy as tool for probing gas-phase dynamics: Protonated Dimethyl Ether ((CH3)2OH+) formed by the reaction of CH3OH2+ with CH3OH
<p>The series of folder contain the .log files from Gaussian(R) 16 of the different species and at different level of theories, as specified in the subfolders and filenames. The data refer to calculations that have been submitted for publication as an original research paper:</p> <p>Title: "Infrared action spectroscopy as tool for probing gas-phase dynamics: Protonated Dimethyl Ether, (CH<sub>3</sub>)<sub>2</sub>OH<sup>+</sup>, formed by the reaction of CH<sub>3</sub>OH<sub>2</sub><sup>+</sup> with CH<sub>3</sub>OH</p> <p>Journal: Molecular Physics</p> <p>Authors: V. Richardson, D.B. Rap, S. Brünken and D. Ascenzi</p>
Passive Open-Path Fouriertransform Infrared spectroscopy (OP-FTIR) measurements in the Arctic environment of Ny Ålesund / Svalbard 2023
<p>In the Polar MOSES campaign 2023, a ground-based remote sensing method – OP-FTIR spectroscopy- which is proven to be a flexible long-path technique for the characterization of larger areas was used. This method is able to simultaneously detect various volatile atmospheric compounds relevant for environmental assessment with a single rapid measurement. Many greenhouse gas molecules (e.g., CO<sub>2</sub>, H<sub>2</sub>O, CH<sub>4</sub>) have unique signatures (absorption or emission bands) in the measured spectral IR range. IR spectroscopy allows spatial and non-invasive characterization of emissions and is a useful method to capture emissions along the coastline, both seaward and landward.</p> <p>The passive technique was applied in a mobile mode to obtain IR spectra at different relevant locations. In order to investigate the near surface atmospheric composition, the mobile passive OP-FTIR spectroscopic scanning measurements was executed with Bruker RAPID devices to cover marine and terrestrial areas. The RAPID passive detection systems was deployed for 360° remote sensing of threats at distances up to 5000 m. Initially, the survey's primary objective was to qualitatively interpret spectra, enabling the identification of emission sources and the characterization of the heterogeneous emission pattern. This was achieved through the measurements in different directions to allow the direct comparisons of the various compartments under investigation and their potential interactions.</p>
DATA SET: In vivo characterization of the optical and hemodynamic properties of the human sternocleidomastoid muscle through ultrasound-guided hybrid near-infrared spectroscopies.
<p>This repository contains the data sets of the article:</p><p>L. Cortese et al., "In vivo characterization of the optical and hemodynamic properties of the human sternocleidomastoid muscle through ultrasound-guided hybrid near-infrared spectroscopies."</p>
A Multi-Center Study of Near-Infrared Spectroscopy (NIRS) for Hematoma Detection
ClinicalTrials.gov study NCT00576147. IPD Sharing: Not stated. Countries: 1. Publications: 3.
Near Infrared Spectroscopy (NIRS) as Transfusion Indicator in Neurocritical Patients
ClinicalTrials.gov study NCT00566709. IPD Sharing: Not stated. Countries: 1. Publications: 2.
Total Shoulder Arthroplasty Near-infrared Spectroscopy
ClinicalTrials.gov study NCT02198183. IPD Sharing: Not stated. Countries: 1. Publications: 4.
Near Infrared Spectroscopy Cortical Response to Noxious and Auditory Stimuli in Subjects Under General Anesthesia
ClinicalTrials.gov study NCT02703090. IPD Sharing: NO. Countries: 1. Publications: 1.
Near-Infrared Spectroscopy for Pediatric Acute Scrotum and Testicular Torsion
ClinicalTrials.gov study NCT01812109. IPD Sharing: Not stated. Countries: 1. Publications: 4.
Data from: Stability assessment of organic sulfur and organosulfate compounds in filter samples for quantification by Fourier Transform-Infrared Spectroscopy and Ion Chromatography
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Data from "Quantification of major particulate matter species from a single filter type using infrared spectroscopy – Application to a large-scale monitoring network"
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Data from: Charcoal analysis for temperature reconstruction with infrared spectroscopy
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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.
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.