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142 results for “light intensity”
Measurement of energies and intensities of multiple ionization satellite (MIS) excited in light elements by helium ion beams
<p>TNA project number: <strong>19001708-ST</strong></p> <p><strong>Measurement of energies and intensities of multiple ionization satellite (MIS) excited in light elements by helium ion beams</strong></p> <p><em>Scientific background:</em></p> <p>Over 1600 X-ray spectra have been collected from the alpha particle X-ray spectrometers on Mars rovers including the present Curiosity rover. The spectra are excited by the radionuclide <sup>244</sup>Cm, which emits 5 MeV He ions for PIXE and Pu L X-rays for XRF. These spectra provide elemental analysis of rocks, soils and dust as part of the quest to identify formerly habitable (water-bearing) environments. Applicant is a member of the Curiosity APXS team within NASA’s Mars Science Laboratory. Excitation of K X-rays by 5 MeV He ions produces also energy-shifted satellites due to 1, 2 or 3 L-shell spectator vacancies. These cause significant distortion of the diagram lines and worsen the quality of spectrum fits by the GUPIX(Mars) code. An MIS database is needed to support a correction procedure that is already devised. This work will increase analytical accuracy and will also support more accurate terrestrial PIXE analysis using alpha beams, especially when partnered with RBS; this could lead to increased use of these two IBA methods in a complementary manner.</p> <p> </p> <p><em>Measurements performed within TNA project:</em></p> <p>The wavelength-dispersive in-vacuum x-ray spectrometer of J. Stefan Institute (Ljubljana, Slovenia) [1] have been used to record high energy resolution KaL<sup>N</sup> X-ray spectra of Ca and Cr induced in collisions with MeV alpha particles. The targets used were metallic Cr, Cr<sub>2</sub>O<sub>3</sub>, and CaF<sub>2</sub>. The KaL<sup>N</sup> X-ray spectra of Cr and Cr<sub>2</sub>O<sub>3</sub> were measured using three different energies of He ions, namely 3 MeV, 4 MeV and 5 MeV. For CaF<sub>2</sub> we have collected only spectra induced with 5 MeV He beam. The main purpose of the experiment was to record KaL<sup>N</sup> spectra with good enough statistics to determine precisely energy/intensity of the corresponding satellite lines. The results for the energy shifts and relative intensities of the groups will be incorporated in the MIS database providing an empirical means for inclusion of one peak per satellite group when modelling energy-dispersive spectra (GUPIX(Mars) code).</p> <p>[1] M. Kavčič, M. Budnar, A. Mühleisen, F. Gasser, M. Žitnik, K. Bučar, R. Bohinc, <em>Design and performance of a versatile curved-crystal spectrometer for high-resolution spectroscopy in the tender x-ray range</em>, Rev. Sci. Instr. 83, 033113 (2012). <a href="http://dx.doi.org/10.1063/1.3697862">http://dx.doi.org/10.1063/1.3697862</a></p> <p> </p> <p><em>Data files:</em></p> <p>We are sharing the detector files (a series of single exposure 2D raw images) collected by the Andor DX438-BV CCD camera (770 × 1152 pixels with pixel size 22.5×22.5 <em>μ</em>m<sup>2</sup>) after the diffraction on the crystal analyzer. The horizontal axis of the detector corresponds to the dispersion axis and diffracted photons are detected at different horizontal positions according to their wavelength, the vertical axis of the detector serves mainly to accumulate more statistics. The final emission spectra are obtained from the corresponding detector files using the home-written data processing software.</p> <p> </p> <p> </p>
Effects of sleep restriction and light intensity on mental effort during cognitive challenge Study 2
<p>This repository contains the data of Study 2 of the manuscript "Effects of sleep restriction and light intenisty on mental effort during cognitive challenge" by Larissa Wüst and Ruta Lasauskaite.</p>
Air temperature and light intensity measurements within and near the Coweeta basin from 2011 to 2013
In this study 50 HOBO data loggers were deployed at 61 locations within and near the Coweeta basin to record air temperature and light intensity observations. The loggers were deployed between April 2011 and April 2012. The duration of observation at each location varied. All loggers were removed by February 2013. In April 2012, radiation shields constructed of two inverted plastic funnels were added to a subset of loggers in an attempt to reduce the effect of solar radiation on daytime temperature observations. Light intensity data collected by the loggers were used as a means of flagging potentially erroneous observations when the logger was exposed to direct sunlight. A light intensity threshold above which observations were flagged was determined by comparing logger observations to those collected by nearby (<5m) sensors protected with commercial gill style radiation shields. Despite attempts to flag potentially erroneous daytime temperature observations, it is likely that errors remain and these data should be used accordingly.
Dataset on light measuments in the understory of a Tropical forest restoration submitted to four thinning intensities through chemical management
<p>The lack of information on the management of light in tropical forests causes a technical constraint for timber production in restoration sites, especially given the light restrictions for timber production. This issue could be amended with the development of methods to easily manage and estimate light availability, targeting practices that balance restoration success and productivity. We conducted the study that gathered this data in an area within the Atlantic Forest, Brazil, where we tested the efficiency of chemical thinning fast-growing species to increase light availability in the understory of a five-year-old restoration planting. Our goal was to increase the growth rates of desirable timber species in the understory of the restoration site. <br>Moreover, we tested the viability of using hemispherical photography taken with a smartphone to assess light incidence and assist restoration management practices. We calculated the percentage of photosynthetically active radiation (PAR) using a ceptometer in four different thinning intensities and compared them to the smartphone measures using correlation analysis and generalized mixed models. Chemical thinning increased light incidence in the understory Light management through PAR and canopy opening were highly correlated overall, especially after three months of management and above 60% of the basal area thinned. Data demonstrates the potential of chemical thinning as a management practice to enhance light availability in the understory of tropical forest restoration sites and highlights the value of using smartphones and fisheye clips for the indirect assessment of light conditions. </p>
Light intensity in reflection mode of PAAO (AJ-5-04-27 sample, 2nd anodization)
<p>Light intensity data recorded during the anodization of aluminum monocrystal.</p> <p>Light source: SLS201L/M (ThorLabs).</p> <p>Spectrometer: USB4000 (OceanOptics).</p> <p>Spectra acquisition software: SpectraSuite (OceanOptics). Integration time: 380 µs. Scans to average: 10. Spectrum is recorded every 500 ms during anodization. ref.txt includes reference spectra just before the start of anodization process. All measurements data is also included in a single "AJ-5-04-27.zip" file.</p> <p>Anodization was performed in 0.3 mol/L oxalic acid at 40 V for 4 min 57 s.</p>
Light intensity in reflection mode of PAAO (AJ-3-04-20 sample, 2nd anodization)
<p>Light intensity data recorded during the anodization of aluminum monocrystal.</p> <p>Light source: SLS201L/M (ThorLabs).</p> <p>Spectrometer: USB4000 (OceanOptics).</p> <p>Spectra acquisition software: SpectraSuite (OceanOptics). Integration time: 380 µs. Scans to average: 10. Spectrum is recorded every 500 ms during anodization. ref.txt includes reference spectra just before the start of anodization process. All measurements data is also included in a single "AJ-3-04-20.zip" file.</p> <p>Anodization was performed in 0.3 mol/L oxalic acid at 40 V for 4 min 8 s.</p>
Light intensity in reflection mode of PAAO (AJ-4-04-20 sample, 2nd anodization)
<p>Light intensity data recorded during the anodization of aluminum monocrystal.</p> <p>Light source: SLS201L/M (ThorLabs).</p> <p>Spectrometer: USB4000 (OceanOptics).</p> <p>Spectra acquisition software: SpectraSuite (OceanOptics). Integration time: 360 µs. Scans to average: 10. Spectrum is recorded every 500 ms during anodization. ref.txt includes reference spectra just before the start of anodization process. All measurements data is also included in a single "AJ-1-04-20.zip" file.</p> <p>Anodization was performed in 0.3 mol/L oxalic acid at 40 V for 4 min 30 s.</p>
Light intensity in reflection mode of PAAO (AJ-2-04-20 sample, 2nd anodization)
<p>Light intensity data recorded during the anodization of aluminum monocrystal.</p> <p>Light source: SLS201L/M (ThorLabs).</p> <p>Spectrometer: USB4000 (OceanOptics).</p> <p>Spectra acquisition software: SpectraSuite (OceanOptics). Integration time: 360 µs. Scans to average: 10. Spectrum is recorded every 500 ms during anodization. ref.txt includes reference spectra just before the start of anodization process. All measurements data is also included in a single "AJ-2-04-20.zip" file.</p> <p>Anodization was performed in 0.3 mol/L oxalic acid at 40 V for 3 min 37 s.</p>
Light intensity in reflection mode of PAAO (AJ-1-04-20 sample, 2nd anodization)
<p>Light intensity data recorded during the anodization of aluminum monocrystal.</p> <p>Light source: SLS201L/M (ThorLabs).</p> <p>Spectrometer: USB4000 (OceanOptics).</p> <p>Spectra acquisition software: SpectraSuite (OceanOptics). Integration time: 330 µs. Scans to average: 10. Spectrum is recorded every 500 ms during anodization. ref.txt includes reference spectra just before the start of anodization process. All measurements data is also included in a single "AJ-1-04-20.zip" file.</p> <p>Anodization was performed in 0.3 mol/L oxalic acid at 40 V for 3 min 16 s.</p>
Light intensity in reflection mode of PAAO (AJ-3-04-20 sample, 1st anodization)
<p>Light intensity data recorded during the anodization of aluminum monocrystal.</p> <p>Light source: SLS201L/M (ThorLabs).</p> <p>Spectrometer: USB4000 (OceanOptics).</p> <p>Spectra acquisition software: SpectraSuite (OceanOptics). Integration time: 360 us. Scans to average: 10. Spectrum is recorded every 2 s during anodization. ref.txt includes reference spectra just before the start of anodization process. All measurements data is also included in a single "AJ-3-04-20.zip" file.</p> <p>Anodization was performed in 0.3 mol/L oxalic acid at 40 V for 1 hour.</p>
Technical Reports: Methods - The application of temperature and light intensity as intermittency sensors in a temporary pond
<p>Dataset for Technical Reports: Methods - The application of temperature and light intensity as intermittent sensors in a temporary pond.</p>
Fig. 6 in Effect of Nutrient, Light Intensity and Temperature on the Growth Rates and Metabolism of a Stress-Resistant Bacillariophyta Species Entomoneis sp. - in Izmir Bay (Aegean Sea) Abstract
Fig. 6: Maxiumum growth rate determination of all temperatures, light intensities and nutrient concentrations.
Fig. 5 in Effect of Nutrient, Light Intensity and Temperature on the Growth Rates and Metabolism of a Stress-Resistant Bacillariophyta Species Entomoneis sp. - in Izmir Bay (Aegean Sea) Abstract
Fig. 5: Entomoneis sp biomass (Chl a, µg /L) under different N/P ratios and light intensities (a) representing growth under T1°C (b) T2°C (c) and T3°C.
Fig. 2 in Effect of Nutrient, Light Intensity and Temperature on the Growth Rates and Metabolism of a Stress-Resistant Bacillariophyta Species Entomoneis sp. - in Izmir Bay (Aegean Sea) Abstract
Fig. 2: 3D response surface plot and contour line of Box– Behnken Design showing the mutual effect of temperature and light intensity on chlorophyll a concentration (µg/L) of Entomoneis sp. using an N/P ratio of 11.
Fig. 3 in Effect of Nutrient, Light Intensity and Temperature on the Growth Rates and Metabolism of a Stress-Resistant Bacillariophyta Species Entomoneis sp. - in Izmir Bay (Aegean Sea) Abstract
Fig. 3: 3D response surface plot and contour line of Box– Behnken Design showing the mutual effect of temperature and light intensity on growth rate (day-1) of Entomoneis sp. using an N/P ratio of 4.4.
Fig. 4 in Effect of Nutrient, Light Intensity and Temperature on the Growth Rates and Metabolism of a Stress-Resistant Bacillariophyta Species Entomoneis sp. - in Izmir Bay (Aegean Sea) Abstract
Fig. 4: 3D response surface plot and contour line of Box– Behnken Design showing the mutual effect of temperature and light intensity on growth rate (day-1) of Entomoneis sp. using an N/P ratio of 27.
Light intensity reflected from PAAO containing samples (AoI 45 deg., 60 deg., two polarisations)
<p>The file contains raw intensity data measured in reflection mode for various material combinations: porous anodized aluminium oxide (PAAO), gold nanoparticles (Au NPs), diamond-like carbon with silver nanoparticles composite (DLC:Ag), quartz, and silicon.</p> <p>List of investigated samples:</p> <table> <thead> <tr> <th scope="col">Sample name</th> <th scope="col">Sample description</th> </tr> </thead> <tbody> <tr> <td>AJ1</td> <td>Aluminium substrate, ~241 nm thickness PAAO (anodized in 0.3 mol/L oxalic acid at 40 V for 3 min 16 s), 60 nm diameter Au NPs (dip-coated at a speed of 1 μm/s)</td> </tr> <tr> <td>AJ2</td> <td>Aluminium substrate, ~259 nm thickness PAAO (anodized in 0.3 mol/L oxalic acid at 40 V for 3 min 37 s), 60 nm diameter Au NPs (dip-coated at a speed of 1 μm/s)</td> </tr> <tr> <td>AJ3</td> <td>Aluminium substrate, ~293 nm thickness PAAO (anodized in 0.3 mol/L oxalic acid at 40 V for 4 min 8 s), 60 nm diameter Au NPs (dip-coated at a speed of 1 μm/s)</td> </tr> <tr> <td>AJ4</td> <td>Aluminium substrate, ~317 nm thickness PAAO (anodized in 0.3 mol/L oxalic acid at 40 V for 4 min 30 s), 60 nm diameter Au NPs (dip-coated at a speed of 1 μm/s)</td> </tr> <tr> <td>AJ5</td> <td>Aluminium substrate, ~345 nm thickness PAAO (anodized in 0.3 mol/L oxalic acid at 40 V for 4 min 57 s), 60 nm diameter Au NPs (dip-coated at a speed of 1 μm/s)</td> </tr> <tr> <td>AJ6</td> <td>Aluminium substrate, ~276 nm thickness PAAO (anodized in 0.3 mol/L oxalic acid at 40 V for 3 min 42 s), ~55 nm thickness, 20 V.% Ag concentration DLC:Ag (magnetron sputtered using silver target, 80 sccm argon gas flow, 5.4 sccm C<sub>2</sub>H<sub>2</sub> gas flow, 405 V voltage, 0.09-0.10 A current, 7·10<sup>-3</sup> mbar work pressure, 2 minutes 32 seconds process duration)</td> </tr> <tr> <td>AJ7</td> <td>Aluminium substrate, ~316 nm thickness PAAO (anodized in 0.3 mol/L oxalic acid at 40 V for 4 min 25 s), ~55 nm thickness, 20 V.% Ag concentration DLC:Ag (magnetron sputtered using silver target, 80 sccm argon gas flow, 5.4 sccm C<sub>2</sub>H<sub>2</sub> gas flow, 405 V voltage, 0.09-0.10 A current, 7·10<sup>-3</sup> mbar work pressure, 2 minutes 32 seconds process duration)</td> </tr> <tr> <td>AJ8</td> <td>Aluminium substrate, ~345 nm thickness PAAO (anodized in 0.3 mol/L oxalic acid at 40 V for 5 min 4 s), ~55 nm thickness, 20 V.% Ag concentration DLC:Ag (magnetron sputtered using silver target, 80 sccm argon gas flow, 5.4 sccm C<sub>2</sub>H<sub>2</sub> gas flow, 405 V voltage, 0.09-0.10 A current, 7·10<sup>-3</sup> mbar work pressure, 2 minutes 32 seconds process duration)</td> </tr> <tr> <td>Q140</td> <td>Quartz substrate, ~55 nm thickness, 20 V.% Ag concentration DLC:Ag (magnetron sputtered using silver target, 80 sccm argon gas flow, 5.4 sccm C<sub>2</sub>H<sub>2</sub> gas flow, 405 V voltage, 0.09-0.10 A current, 7·10<sup>-3</sup> mbar work pressure, 2 minutes 32 seconds process duration)</td> </tr> <tr> <td>Si140</td> <td>Silicon substrate, ~55 nm thickness, 20 V.% Ag concentration DLC:Ag (magnetron sputtered using silver target, 80 sccm argon gas flow, 5.4 sccm C<sub>2</sub>H<sub>2</sub> gas flow, 405 V voltage, 0.09-0.10 A current, 7·10<sup>-3</sup> mbar work pressure, 2 minutes 32 seconds process duration)</td> </tr> </tbody> </table> <p>The file also contains data for lamp and dark spectra. Images are for illustrative purposes and contain measured sample intensity minus dark intensity.</p> <p>The spectra were collected by a custom-made computer-controlled motorized goniometer set-up with an incandescent lamp light source and an AvaSpec-2048 (Avantes) spectrometer covering a wavelength range of 360–860 nm with 1.2 nm resolution.</p> <p>Notations inside the file: AoI - angle of incidence (45 deg. or 60 deg.), AoD - angle of detection (90 deg. is mirror reflection from 45 deg. incidence, while 120 deg. is the same for 60 deg.), pol - angle of the polarizing prism (0 deg. or 90 deg., light intensity was lower for the 0 deg.).</p>
Impact of light intensity on sugar maple leaf physical traits and consequences for caterpillar preference and performance
Open the record for dataset details and reuse information.
Changes in incident light intensity to streams with progressive hemlock mortality at 5 Coweeta Hydrologic Laboratory study sites from 2005 to 2015
The purpose of this study was to document changes in light intensity to streams in areas affected by hemlock mortaity. From June 2005 to November 2015, relative light intensity at 5 locations along each stream reach was monitored every 5 minutes. This study was conducted at Coweeta Hydrologic Laboratory. Five stream sites were located on 1st - 2nd order streams reaches affected by hemlock death. All sites were located in areas that have not been logged since the area became National Forest in the late 1920s and where streams passed through or were adjacent to permanent vegetation plots in which trees were measured in 1934-35, 1969-73 and 1988-93 (Elliott and Swank, 2008.)
Spectral data and R modeling code from: Polarized light sensitivity in Pieris rapae is dependent on both color and intensity
<p>This dataset provides supplementary spectral data and the R code underlying the spectral sensitivy moding of female <em>Pieris rapae</em> photoreceptors used in the manuscript "Polarized light sensitivity in <em>Pieris rapae</em> is dependent on both color and intensity".</p>
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