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2,649 results for “optics”
Observation of mHz-level cooperative Lamb shifts in an optical atomic clock
<p>We report on the direct observation of resonant electric dipole-dipole interactions in a cubic array of atoms in the many-excitation limit. The interactions, mediated by single-atom couplings to the shared electromagnetic vacuum, are shown to produce spatially-dependent cooperative Lamb shifts when spectroscopically interrogating the mHz-wide optical clock transition in strontium-87. We show that the ensemble-averaged shifts can be suppressed below the level of evaluated systematic uncertainties for state-of-the-art optical atomic clocks. Additionally, we demonstrate that excitation of the atomic dipoles near a Bragg angle can enhance these effects by nearly an order of magnitude compared to non-resonant geometries. Given the remarkable precision of frequency measurements and the high accuracy of the modeled response, our work demonstrates that such a clock is a novel platform for studies of the quantum many-body physics of spins with long-range interactions mediated by propagating photons.</p>
A new optical practice as an effective alternative to insecticides for controlling highly resistant thrips
<p>The documents are raw data for an article entitled "<strong>A new optical practice as an effective alternative to insecticides for controlling highly resistant thrips</strong>", including the original data of Bioassy, Megalurothrips usitatus occurrence rate, RT-qPCR, standard curves, Thrips palmi occurrence rate, and yield and fruit shape of Cowpea and Hami melon.</p>
Calcium imaging data from: Functional organization of visual responses in the octopus optic lobe
<p>Cephalopods are highly visual animals with camera-type eyes, large brains, and a rich repertoire of visually guided behaviors. However, the cephalopod brain evolved independently from that of other highly visual species, such as vertebrates, and therefore the neural circuits that process sensory information are profoundly different. It is largely unknown how their powerful but unique visual system functions, since there have been no direct neural measurements of visual responses in the cephalopod brain. In this study, we used two-photon calcium imaging to record visually evoked responses in the primary visual processing center of the octopus central brain, the optic lobe, to determine how basic features of the visual scene are represented and organized. We found spatially localized receptive fields for light (ON) and dark (OFF) stimuli, which were retinotopically organized across the optic lobe, demonstrating a hallmark of visual system organization shared across many species. Examination of these responses revealed transformations of the visual representation across the layers of the optic lobe, including the emergence of the OFF pathway and increased size selectivity. We also identified asymmetries in the spatial processing of ON and OFF stimuli, which suggest unique circuit mechanisms for form processing that may have evolved to suit the specific demands of processing an underwater visual scene. This study provides insight into the neural processing and functional organization of the octopus visual system, highlighting both shared and unique aspects, and lays a foundation for future studies of the neural circuits that mediate visual processing and behavior in cephalopods.</p>
Source data for: Raman sideband cooling of molecules in an optical tweezer array
<p>Ultracold molecules, because of their rich internal structures and interactions, have been proposed as a promising platform for quantum science and precision measurement. Direct laser-cooling promises to be a rapid and efficient way to bring molecules to ultracold temperatures. For trapped molecules, laser-cooling to the quantum motional ground state remains an outstanding challenge. A technique capable of reaching the motional ground state is Raman sideband cooling, first demonstrated in trapped ions and atoms. In this work, we demonstrate for the first time Raman sideband cooling of molecules. Specifically, we demonstrate 3D Raman cooling for single CaF molecules trapped in an optical tweezer array, achieving average radial (axial) motional occupation as low as $\bar{n}_r=0.27(7)$ ($\bar{n}_z=7.0(10)$). Notably, we measure a 1D ground state fraction as high as 0.79(4), and a motional entropy per particle of $s = 4.9(3)$, the lowest reported for laser-cooled molecules to date. These lower temperatures could enable longer coherence times and higher fidelity molecular qubit gates desirable for quantum information processing and quantum simulation. With further improvements, Raman cooling could also be a new route towards molecular quantum degeneracy applicable to many laser-coolable molecular species including polyatomic ones. </p>
Stability Measurement of a 340 nm UV Source at the Optical Laboratory of BFKH.
<p>Dataset archive of the stability Measurement of a 340 nm UV Source at the Optical Laboratory of BFKH.</p><p>The project 19ENV02 RemoteALPHA has received funding from the EMPIR programme co-financed by the Participating States and from the European Union's Horizon 2020 research and innovation programme. - https://remotealpha.drmr.nipne.ro/</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>
Magnesium-Vacancy Optical Centers in Diamond
<p>Dataset for the published article </p><p>Magnesium-Vacancy Optical Centers in Diamond</p><p>ACS Photonics</p><p>https://pubs.acs.org/action/showCitFormats?doi=10.1021/acsphotonics.2c01130&ref=pdf</p>
Optical Illusion - Following Eyes
Rotate the model (but not too much) and the dinosaur's eyes will follow. 3D scan made from still frames from this video by [brusspup](https://www.youtube.com/channel/UCeQEKFH31vvD-InkTGSvCrA) : https://www.youtube.com/watch?v=A4QcyW-qTUg Source: Objaverse 1.0 / Sketchfab
Internal large field of view observations with optical microscope of fatigue damage in composite materials during bending loading
<p>Stitched microscope pictures ...</p> <p>References to this data-set should include a reference to one of the following two papers in where the data has been used.</p> <p>Mortensen U., Andersen, T.L., Mikkelsen, L.P., Observation of Edge Effect in Flexural Fatigue Test of Composites using Large Field of View Microscopy, Journal of Composite Materials. https://doi.org/10.1177/0021998320902233, 2020</p> <p>Mortensen, U.A., Mikkelsen, L.P., Andersen, T.L. Observation of the interaction between transverse cracking and fibre breaks in uni-directional non-crimp fabric composites subjected to cyclic bending fatigue damage mechanism, submitted, Feb. 2022.</p> <p>The naming of the pictures are build up by the follwing elements</p> <p>EL_05 is the plate ID,<br> J01-J09 is the sample ID where the following load level are defined:</p> <ul> <li>J01: 1 000 cycles</li> <li>J02: 2 500 cycles</li> <li>J03: 5 000 cycles</li> <li>J04: 10 000 cycles</li> <li>J05: 50 000 cycles</li> <li>J06: 100 000 cycles</li> <li>J07: 250 000 cycles</li> <li>J08: 500 000 cycles</li> <li>J09: 1 000 000 cycles</li> </ul> <p>S01-04: is the 4 surfaces inside the sample as shown in the picture saved in: xxx. The picture show the sample where the red planes indicate the polished surfaces where the microscopy pictures from the internal surfaces are taken.</p> <p>The pictures are oriented with the compression side upward and the tensile side downward similar to the orientation of the actual 4-point fatigue bending test sample.</p>
Safety Study of an Adeno-associated Virus Vector for Gene Therapy of Leber's Hereditary Optic Neuropathy
ClinicalTrials.gov study NCT02161380. IPD Sharing: Not stated. Countries: 1. Publications: 11.
Novel Optical Surface Image Guidance System for Beam-Gated Online Adaptive SBRT Delivery in Mobile Lower Lung and Upper Abdominal Malignancies
ClinicalTrials.gov study NCT05030454. IPD Sharing: YES. Countries: 1. Publications: 1.
OPtical Diagnosis Training to Improve Dysplasia Characterisation in IBD
ClinicalTrials.gov study NCT04924543. IPD Sharing: NO. Countries: 3. Publications: 14.
Evaluation of HealinG of Polymer-Free Biomlimus A9-Coated Stent by Optical Coherence Tomography (EGO-BIOFREEDOM)
ClinicalTrials.gov study NCT01760876. IPD Sharing: Not stated. Countries: 1. Publications: 7.
Fibre-optic Guided Tracheal Intubation Through SADs
ClinicalTrials.gov study NCT03118596. IPD Sharing: NO. Countries: 1. Publications: 6.
Effect of Cervical Collar on the Optic Nerve Sheath Diameter in Minor Head Trauma
ClinicalTrials.gov study NCT03742427. IPD Sharing: NO. Countries: 1. Publications: 2.
Pharmacokinetics of MB-102 and Use of the Non-invasive Optical Renal Function Monitor (ORFM) Device in Subjects With Normal and Impaired Renal Function and a Range of Skin Color Types
ClinicalTrials.gov study NCT02772276. IPD Sharing: NO. Countries: 1. Publications: 1.
Safety and Efficacy Study of rAAV2-ND4 Treatment of Leber Hereditary Optic Neuropathy (LHON)
ClinicalTrials.gov study NCT01267422. IPD Sharing: NO. Countries: 1. Publications: 32.
Observational Study of Optical Correction for Strabismic Amblyopia in Children 3 to <7 Years Old
ClinicalTrials.gov study NCT00669539. IPD Sharing: Not stated. Countries: 1. Publications: 1.
Optical Frequency Domain Imaging (OFDI) and Vascular Healing After Stent Placement
ClinicalTrials.gov study NCT01794949. IPD Sharing: UNDECIDED. Countries: 1. Publications: 2.
Optical Coherence Tomography Angiography Evaluation of Ocular Changes in Patients With Carotid Artery Stenosis
ClinicalTrials.gov study NCT04326842. IPD Sharing: UNDECIDED. 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.