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58 results for “cryogenic”
Sample raw images from cryogenically cooled Large Field Camera chip 0 at Palomar Observatory
<p>Bias, dark, flat and science images from chip 0 of the LFC at Palomar Observatory, taken by Erik Tollerud</p>
FTIR-ATR Spectra of Pelagic Sargassum Specimens under Different Flash-Freeze Timing and Cryogenic Storage Conditions
<p><strong>About the data set origin</strong></p> <p>The dataset comprises ATR-FTIR spectral CSV files of pelagic <em>Sargassum</em> specimens, including <em>S. fluitans</em> III (labeled "flu3" in the sample ID), <em>S. natans</em> I (labeled "nat1"), and <em>S. natans</em> VII (labeled "nat8"). The specimens were collected from three sites on the south Mexican Caribbean coast: Mahahual (labeled "Ma"), Xcalak (labeled "Xk"), and Xahuayxol (labeled "Xa"). The experimental design includes a treatment condition based on the timing of flash-freezing: the fresh group (labeled d00) and the lab group (labeled d01). The fresh group was flash-frozen on the shore and stored under cryogenic conditions, while the lab samples were flash-frozen upon arrival at the laboratory facilities. The sample IDs are listed in <strong>Table 1</strong>.</p> <p><strong>About the Equipment and Data Acquisition</strong></p> <p>All ATR-FTIR analyses were conducted using a Nicolet iS5 from Thermo Scientific (USA), equipped with an iD7 accessory and a ZnSe crystal plate. The Thermo Scientific OMNIC software was used for the analysis. Background noise was removed from all spectra. The spectral acquisition range spanned from 500 to 4000 cm⁻¹, with 32 scans per sample and a spectral resolution of 4 cm⁻¹, resulting in a data spacing of 0.482 cm⁻¹. Each sample was analyzed in triplicate.</p> <p><strong>Table 1</strong>. Sample ID and size for the flash-freeze comparison dataset</p> <table> <tbody> <tr> <td> <p><strong>Site</strong></p> </td> <td> <p><strong>Morphotype</strong></p> </td> <td> <p><strong>Flash-freeze treatment</strong></p> </td> <td> <p><strong>Samples collected</strong></p> </td> <td> <p><strong>Samples read in triplicate</strong></p> </td> </tr> <tr> <td>Mahahual (Ma)</td> <td><em>S. fluitans</em> III (flu3)</td> <td>Fresh (d00)</td> <td>2</td> <td>6</td> </tr> <tr> <td> </td> <td><em> </em></td> <td>Lab (d01)</td> <td>2</td> <td>6</td> </tr> <tr> <td> </td> <td><em>S. natans</em> I (nat1)</td> <td>Fresh (d00)</td> <td>2</td> <td>6</td> </tr> <tr> <td> </td> <td> </td> <td>Lab (d01)</td> <td>2</td> <td>6</td> </tr> <tr> <td> </td> <td><em>S. natans</em> VIII (nat8)</td> <td>Fresh (d00)</td> <td>2</td> <td>6</td> </tr> <tr> <td> </td> <td> </td> <td>Lab (d01)</td> <td>2</td> <td>6</td> </tr> <tr> <td>Xahuayxol (Xa)</td> <td><em>S. fluitans</em> III (flu3)</td> <td>Fresh (d00)</td> <td>1</td> <td>3</td> </tr> <tr> <td> </td> <td><em> </em></td> <td>Lab (d01)</td> <td>2</td> <td>6</td> </tr> <tr> <td> </td> <td><em>S. natans</em> I (nat1)</td> <td>Fresh (d00)</td> <td>1</td> <td>3</td> </tr> <tr> <td> </td> <td> </td> <td>Lab (d01)</td> <td>2</td> <td>6</td> </tr> <tr> <td> </td> <td><em>S. natans</em> VIII (nat8)</td> <td>Fresh (d00)</td> <td>1</td> <td>3</td> </tr> <tr> <td> </td> <td> </td> <td>Lab (d01)</td> <td>2</td> <td>6</td> </tr> <tr> <td>Xcalak (Xk)</td> <td><em>S. fluitans</em> III (flu3)</td> <td>Fresh (d00)</td> <td>1</td> <td>3</td> </tr> <tr> <td> </td> <td> </td> <td>Lab (d01)</td> <td>2</td> <td>6</td> </tr> <tr> <td> </td> <td><em>S. natans</em> I (nat1)</td> <td>Fresh (d00)</td> <td>1</td> <td>3</td> </tr> <tr> <td> </td> <td> </td> <td>Lab (d01)</td> <td>2</td> <td>6</td> </tr> <tr> <td> </td> <td><em>S. natans</em> VIII (nat8)</td> <td>Fresh (d00)</td> <td>1</td> <td>3</td> </tr> <tr> <td> </td> <td> </td> <td>Lab (d01)</td> <td>2</td> <td>6</td> </tr> <tr> <td> </td> <td> </td> <td><strong>Total </strong></td> <td><strong>30</strong></td> <td><strong>90</strong></td> </tr> </tbody> </table>
Data for: Assessment of cryogenic pretreatment for simulating environmental weathering in the formation of surrogate micro- and nanoplastics from agricultural mulch film
<p>Microplastics (MPs) and nanoplastics (NPs) from mulch films and other plastic materials employed in vegetable and small fruit production pose a major threat to agricultural ecosystems. For conducting controlled studies on MPs' and NPs' (MNPs') ecotoxicity to soil organisms and plants and fate and transport in soil, surrogate MNPs are<br>required that mimic MNPs that form in agricultural fields. We have developed a procedure to prepare MPs from plastic films or pellets using mechanical milling and sieving, and conversion of the resultant MPs into NPs through wet grinding, both steps of which mimic the degradation and fragmentation of plastics in nature. The major goal of this study was to determine if cryogenic exposure of two biodegradable mulch films effectively mimics the embrittlement caused by environmental weathering in terms of the dimensional, thermal, chemical, and biodegradability properties of the formed MNPs. We found differences in size, surface charge, thermal and chemical properties, and biodegradability in soil between MNPs' prepared from cryogenically treated vs. environmentally weathered films, related to the photochemical reactions occurring in the environment that were not mimicked by cryogenic treatment, such as depolymerization and cross-link formation. We also investigated the size reduction process for NPs and found that the size distribution was bimodal, with populations centered at 50 nm and 150–300 nm, and as the size reduction process progressed, the former subpopulation's proportion increased. The biodegradability of MPs in soil was greater than for NPs, a counter-intuitive trend since greater surface area exposure for NPs would increase biodegradability. The result is associated with differences in surface and chemical properties and to minor components that are readily leached out during the formation of NPs. In summary, the use of weathered plastics as feedstock would likely produce MNPs that are more realistic than cryogenically-treated unweathered films for use in experimental studies.</p>
Cryogenic electron ptychographic single particle analysis with wide bandwidth information transfer
<p>Advances in cryogenic transmission electron microscopy have revolutionised the determination of many macromolecular structures at atomic or nearatomic resolution. This method is based on conventional defocused phase contrast imaging. However, it has limitations of weaker contrast for small biological molecules embedded in vitreous ice, in comparison with cryo-ptychography, which shows increased contrast. Here we report a single-particle analysis based on the use of ptychographic reconstruction data, demonstrating that three dimensional reconstructions with a wide information transfer bandwidth can be recovered by Fourier domain synthesis. Our work suggests future applications in otherwise challenging single particle analyses, including small macromolecules and heterogeneous or flexible particles. In addition structure determination in situ within cells without the requirement for protein purification and expression may be possible.</p>
Data for Cryogenic Characterization and Modeling of 14 nm Bulk FinFET Technology
<p>Data set for "Cryogenic Characterization and Modeling of 14 nm Bulk FinFET Technology"</p> <p>https://zenodo.org/record/6901637</p>
The thermal expansion of a Kevlar® 49 cord down to cryogenic temperatures
<p>In this work the thermal expansion of a twisted Kevlar® 49 cord assembly made at SRON in the 293 K to 7 K temperature range is presented. In addition to these results, the setup used to measure this thermal expansion is described, as are the methods used to calibrate and verify the accuracy of this setup. The setup is accurate to within ±5 % compared to Ti-6Al-4V literature values. The thermal expansion of the SRON Kevlar® 49 cord assembly is measured and compared to the sparse literature available. At 7 K, the total fractional expansion of the Kevlar® cord assembly is 16E-4 relative to 293 K.</p>
Data set: A solid-state high harmonic generation spectrometer with cryogenic cooling
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Dataset to accompany: Heat flux in low mass flux horizontal cryogenic flow
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Data for: Assessment of cryogenic pretreatment for simulating environmental weathering in the formation of surrogate micro- and nanoplastics from agricultural mulch film
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Data from: Uncorrected soil water isotopes through cryogenic vacuum distillation may lead to a false estimation of plant water sources
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High resolution dataset of plastic deformation at cryogenic temperatures in a nickel-based superalloy
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Data from: Development of a sustainability assessment algorithm and its validation using case studies on cryogenic machining
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Supporting data for 'CMOS-based cryogenic control of silicon quantum circuits'
<p>Data supporting for paper 'CMOS-based cryogenic control of silicon quantum circuits'.</p> <p>Loading data requires using 'pickle' function.</p> <p>An example:</p> <p>import pickle<br> data = 'J_calibration_3'<br> f = open('/.../data', 'rb')<br> ds = pickle.load(f)<br> f.close()</p>
Causes and factors of cryogenic extraction biases on isotopes of xylem water
<p>Rehydration experiment on plant materials</p>
Ultra-steep slope cryogenic FETs based on bilayer graphene
<p>Dataset for the publication "Ultra-steep slope cryogenic FETs based on bilayer graphene".</p> <p> </p> <p>Abstract:</p> <p>"Cryogenic field-effect transistors (FETs) offer great potential for a wide range of applications, the most notable example being classical control electronics for quantum information processors.<br>In the latter context, on-chip FETs with low power consumption are a crucial requirement. This, in turn, requires operating voltages in the millivolt range, which are only achievable in devices with ultra-steep subthreshold slopes. <br>However, in conventional cryogenic MOSFETs based on bulk material, the experimentally achieved inverse subthreshold slopes saturate around a few mV/dec due to disorder and charged defects at the MOS interface.<br>FETs based on two-dimensional materials offer a promising alternative.<br>Here, we show that FETs based on Bernal stacked bilayer graphene encapsulated in hexagonal boron nitride and graphite gates exhibit inverse subthreshold slopes of down to 250 μV/dec at 0.1K, approaching the Boltzmann limit.<br>This result indicates an effective suppression of band tailing in van-der-Waals heterostructures without bulk interfaces, leading to superior device performance at cryogenic temperature."</p> <p> </p>
Data underlying figures in "Turning on the emission from isolated GFP chromophore anions at cryogenic temperatures"
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Degenerate photons from a cryogenic spontaneous parametric down-conversion source
<p>Dataset of the publication "Degenerate photons from a cryogenic spontaneous parametric down-conversion source", N. A. Lange, T. Schapeler, J. P. Höpker, M. Protte, and T. J. Bartley, <a href="https://doi.org/10.48550/arXiv.2303.17428">https://doi.org/10.48550/arXiv.2303.17428</a> (2023).</p> <p> </p> <p>Abstract:</p> <blockquote> <p>We demonstrate the generation of degenerate photon pairs from spontaneous parametric down-conversion in titanium-indiffused waveguides in lithium niobate at cryogenic temperatures. Since the phase matching cannot be temperature tuned inside a cryostat, we rely on a precise empirical model of the refractive indices when fabricating a fixed poling period. We design the phase-matching properties of our periodic poling to enable signal and idler photons at 1559.3(6) nm and characterize the indistinguishability of our photons by performing a Hong-Ou-Mandel interference measurement. Despite the effects of photorefraction and pyroelectricity, which can locally alter the phase matching, we achieve cryogenic indistinguishable photons within 1.5 nm of our design wavelength. Our results verify sufficient understanding and control of the cryogenic nonlinear process, which has wider implications when combining quasi-phase-matched nonlinear optical processes with other cryogenic photonic quantum technologies, such as superconducting detectors.</p> </blockquote>
Role of a capping layer on the crystalline structure of Sn thin films grown at cryogenic temperatures on InSb substrates
<p>These are the supplementary data supporting the main publication.</p>
Measurements of rate coefficients of CN+, HCN+ and HNC+ collisions with H2 at cryogenic temperatures
<p>Raw experimental data and post-processing scripts for DOI: 10.1063/5.0153699</p>
Data for Cryogenic InGaAs HEMT-Based Switches For Quantum Signal Routing
<p>Data for "Data for Cryogenic InGaAs HEMT-Based Switches For Quantum Signal Routing".</p>
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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.