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Journal articles on the topic 'Spectre de graisse'

Author: Grafiati

Published: 19 April 2023

Last updated: 31 July 2025

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1

Greenberg, J. M., and F. Baas. "Infrared spectra from interstellar dust grains." Advances in Space Research 5, no. 3 (1985): 19–26. http://dx.doi.org/10.1016/0273-1177(85)90443-0.

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2

Maggipinto, G., A. Minafra, and F. Tritto. "Optical spectra of amorophous carbon grains." Astrophysics and Space Science 108, no. 1 (1985): 101–11. http://dx.doi.org/10.1007/bf00650122.

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3

Höfner, S., S. Bladh, B. Aringer, and K. Eriksson. "Dynamic atmospheres and winds of cool luminous giants." Astronomy & Astrophysics 657 (January 2022): A109. http://dx.doi.org/10.1051/0004-6361/202141224.

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Context. The winds observed around asymptotic giant branch (AGB) stars are generally attributed to radiation pressure on dust formed in the extended dynamical atmospheres of these long-period variables. The composition of wind-driving grains is affected by a feedback between their optical properties and the resulting heating due to stellar radiation. Aims. We explore the gradual Fe enrichment of wind-driving silicate grains in M-type AGB stars to derive typical values for Fe/Mg and to test the effects on wind properties and synthetic spectra. Methods. We present new radiation-hydrodynamical DA

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4

Imada, Saki, Toshiyuki Isshiki, Nobuyuki Tatemizo, et al. "Formation of various-axis-oriented wurtzite nuclei and enlargement of the a-axis-oriented region in AlFeN films deposited on Si(100) substrates." Materials Advances 2, no. 12 (2021): 4075–80. http://dx.doi.org/10.1039/d0ma01026j.

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A-axis-oriented single-crystal AlFeN grains grew from randomly oriented small wurtzite grains with deposition time on Si(100). (a) Deposition time dependence of Al K-edge XANES spectra. (b) Theoretical spectra.

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5

Mariñoso Guiu, Joan, Antoni Macià, and Stefan T. Bromley. "How to accurately model IR spectra of nanosized silicate grains." Proceedings of the International Astronomical Union 15, S350 (2019): 431–33. http://dx.doi.org/10.1017/s174392132000006x.

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AbstractWe assess the accuracy of various computational methods for obtaining infrared (IR) spectra of nanosized silicate dust grains directly from their atomistic structure and atomic motions. First, IR spectra for a selection of small nanosilicate clusters with a range of sizes and chemical compositions are obtained within the harmonic oscillator approximation employing density functional theory (DFT) based quantum chemical calculations. To check if anharmonic effects play a significant role in the IR spectra of these nanoclusters, we further obtain their IR spectra from finite temperature D

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6

Dadswell, G., and W. W. Duley. "Simulation of Infrared Spectra of Carbonaceous Grains." Astrophysical Journal 476, no. 1 (1997): 184–90. http://dx.doi.org/10.1086/303590.

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7

Matter, A., F. C. Pignatale, and B. Lopez. "Spatially resolving the chemical composition of the planet building blocks." Monthly Notices of the Royal Astronomical Society 497, no. 3 (2020): 2540–52. http://dx.doi.org/10.1093/mnras/staa2137.

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ABSTRACT The inner regions of protoplanetary discs (from ∼0.1 to 10 au) are the expected birthplace of planets, especially telluric. In those high-temperature regions, solids can experience cyclical annealing, vapourisation, and recondensation. Hot and warm dusty grains emit mostly in the infrared domain, notably in N-band (8–13 μm). Studying their fine chemistry through mid-infrared spectro-interferometry with the new Very Large Telescope Interferometer (VLTI) instrument Multi AperTure mid-Infrared SpectroScopic Experiment (MATISSE), which can spatially resolve these regions, requires detaile

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Bhowmik, T., A. Boccaletti, P. Thébault, et al. "Spatially resolved spectroscopy of the debris disk HD 32297." Astronomy & Astrophysics 630 (September 24, 2019): A85. http://dx.doi.org/10.1051/0004-6361/201936076.

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Context. Spectro-photometry of debris disks in total intensity and polarimetry can provide new insight into the properties of the dust grains therein (size distribution and optical properties). Aims. We aim to constrain the morphology of the highly inclined debris disk HD 32297. We also intend to obtain spectroscopic and polarimetric measurements to retrieve information on the particle size distribution within the disk for certain grain compositions. Methods. We observed HD 32297 with SPHERE in Y, J, and H bands in total intensity and in J band in polarimetry. The observations are compared to

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Dr., Brajesh Kumar Sharma. "Preliminary fluorometric study of healthy and smut contaminated grains of pearl millet." International Journal of Advance Research in Multidisciplinary 3, no. 1 (2025): 28–30. https://doi.org/10.5281/zenodo.14749102.

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Pearl millet (<em>Pennisetum glaucum</em>) is a vital cereal crop in arid and semi-arid regions, known for its resilience and nutritional value. However, it is susceptible to various diseases, including smut, caused by the fungus <em>Tolyposporium penicillariae</em>, which significantly impacts yield and quality. This preliminary study aims to differentiate healthy and smut-contaminated grains of pearl millet using fluorometric analysis, a technique that measures the fluorescence emitted by substances when excited by light. The study employed fluorometry to detect variations in the fluorescenc

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Bishop, J. L., M. D. Dyar, E. C. Sklute, and A. Drief. "Physical alteration of antigorite: a Mössbauer spectroscopy, reflectance spectroscopy and TEM study with applications to Mars." Clay Minerals 43, no. 1 (2008): 55–67. http://dx.doi.org/10.1180/claymin.2008.043.1.04.

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AbstractPhysical alteration of magnetite-bearing antigorite grains is investigated in this study using Mössbauer, visible/near-infrared (VNIR) and mid-IR spectroscopy coupled with scanning electron microscopy (SEM) and high-resolution transmission electron microscopy (HRTEM) analyses. An expected decrease in grain size with grinding is observed using SEM. The HRTEM images illustrate that the nanophase-sized grains which adhere to larger grains have 7 Å antigorite patterns. Mössbauer spectroscopy shows the presence of antigorite, magnetite and an amorphous phase. Visible/near infrared spectra e

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11

Kalvāns, Juris, and Juris Roberts Kalnin. "Temperature Spectra of Interstellar Dust Grains Heated by Cosmic Rays. III. Mixed-composition Grains." Astrophysical Journal Supplement Series 263, no. 1 (2022): 5. http://dx.doi.org/10.3847/1538-4365/ac92e6.

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Abstract Icy grains in the interstellar medium and star formation regions consist of a variety of materials. Such composite grains interact differently with cosmic-ray (CR) particles compared to simple single-material grains. We aim to calculate the spectra of energies and temperatures of mixed-composition grains undergoing whole-grain heating by CRs. The grains were assumed to consist of a mixture of carbon and olivine, covered by ices consisting of carbon oxides and water. The energy and temperature spectra for grains with radii 0.05, 0.1, and 0.2 μm impacted by CRs were calculated for eight

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12

Capozzi, V., A. Minafra, L. Colangeli, E. Bussoletti, and A. Borghesi. "Amorphous carbon grains: Size effects in ultraviolet spectra." Solid State Communications 65, no. 10 (1988): 1193–96. http://dx.doi.org/10.1016/0038-1098(88)90921-0.

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13

Osborne, B. G., B. Mertens, M. Thompson, and T. Fearn. "The Authentication of Basmati Rice Using near Infrared Spectroscopy." Journal of Near Infrared Spectroscopy 1, no. 2 (1993): 77–83. http://dx.doi.org/10.1255/jnirs.8.

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The feasibility of using near infrared transmission spectroscopy to discriminate between Basmati and other long-grain rice samples was investigated. A discriminant rule was derived using the Fisher linear discriminant function calculated from the first few principal component scores of the NIR spectra. The discriminant rule was assessed by cross-validation. Nine Basmati and 53 other rice samples were classified correctly from NIR spectra measured on 200 g bulk samples but 8% of the Basmatis and 14% of the others were misclassified on the basis of spectra of individual grains. Using average spe

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Yang, Chenbo, Lifang Song, Kunxi Wei, et al. "Study on Hyperspectral Monitoring Model of Total Flavonoids and Total Phenols in Tartary Buckwheat Grains." Foods 12, no. 7 (2023): 1354. http://dx.doi.org/10.3390/foods12071354.

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Tartary buckwheat is a common functional food. Its grains are rich in flavonoids and phenols. The rapid measurement of flavonoids and phenols in buckwheat grains is of great significance in promoting the development of the buckwheat industry. This study, based on multiple scattering correction (MSC), standardized normal variate (SNV), reciprocal logarithm (Lg), first-order derivative (FD), second-order derivative (SD), and fractional-order derivative (FOD) preprocessing spectra, constructed hyperspectral monitoring models of total flavonoids content and total phenols content in tartary buckwhe

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15

Greenberg, J. Mayo. "Basic Laboratory Studies of Grains." Symposium - International Astronomical Union 120 (1987): 501–23. http://dx.doi.org/10.1017/s0074180900154543.

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Laboratory investigations of grain mantles are shown to have a direct application to observations of interstellar grains. the experiments have made it possible to show how infrared spectra may be used as a probe not only of the grains as they are but also as they have evolved both chemically and physically. Growth by accretion, ultraviolet photoprocessing, gradual heating, explosions and general effects of grains on interstellar chemistry provide a consistent basis for understanding evolution of grains in terms of interactions with the gas, and ultraviolet radiation in both diffuse and dense r

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16

Avishai, Yshai, Daniel Berend, and Luba Bromberg. "Discrete charging of metallic grains: statistics of addition spectra." Journal of Physics A: Mathematical and General 39, no. 18 (2006): 4797–810. http://dx.doi.org/10.1088/0305-4470/39/18/002.

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17

Capozzi, Vito, Cristina Flesia, and Antonio Minafra. "Anomalous dips in extinction spectra of disordered carbon grains." Optics Communications 68, no. 3 (1988): 166–70. http://dx.doi.org/10.1016/0030-4018(88)90177-0.

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18

Fernandes, C. D., D. Johnson, J. C. Bridges, and Monica M. Grady. "UV-Vis spectroscopy of stardust." International Journal of Astrobiology 5, no. 4 (2006): 287–93. http://dx.doi.org/10.1017/s1473550406003363.

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NASA's Stardust mission flew through the coma of comet Wild 2 in January 2004, capturing dust grains as it did so. The grains were returned safely to Earth in January 2006, and are in the process of being distributed to investigators. As members of the Spectroscopy Preliminary Examination Team, we are preparing to analyse Stardust grains. Our contribution is to measure the spectrum of the grains between 200 nm (in the near ultraviolet) and 800 nm (near infrared). The purpose of the measurement is to provide an additional technique for characterizing the grains, one that is complementary to oth

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19

Xu, Ling Fang, Kang Sun, Xing Feng, Hai Bo Xiao, Rui Long Wang, and Chang Ping Yang. "Abnormal capacitance–voltage behaviors of bismuth-doped CaCu3Ti4O12 ceramics." International Journal of Modern Physics B 31, no. 20 (2017): 1750133. http://dx.doi.org/10.1142/s0217979217501338.

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Ca[Formula: see text]Bi[Formula: see text]Cu3Ti4O[Formula: see text] ([Formula: see text] = 0.0, 0.1, 0.2 and 0.3; BCCTO) ceramics were prepared by traditional solid-state sintering method. All samples had pure cubic perovskite-like structure. A drastic grain size reduction was observed with bismuth doping. Dielectric spectra showed two obvious relaxation steps corresponding to two series of peaks in the imaginary part of electric modulus spectra and dielectric loss spectra too. Activation energy fitting by electric modulus spectra reflected different conducting segments in BCCTO ceramics of g

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20

Kabacińska, Zuzanna, and Alida Timar-Gabor. "Dating Sediments by EPR Using Al-h Centre: A Comparison between the Properties of Fine (4–11 µm) and Coarse (>63 µm) Quartz Grains." Molecules 27, no. 9 (2022): 2683. http://dx.doi.org/10.3390/molecules27092683.

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The possibility of EPR dating for sediments using Al-h signals of fine (4–11 μm) grains of quartz has not been previously discussed. Here, the Al-h and peroxy EPR spectra of fine (4–11 μm) and coarse (63–90, 125–180 μm) sedimentary quartz from thoroughly investigated loess sites in Eastern Europe were examined. By comparing experimental spectra with a simulated signal, we evaluated the overestimation observed when using the standard approach established by Toyoda and Falguères to measure Al-h intensity for different doses of radiation, up to 40,000 Gy. This overestimation, caused by the presen

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21

Sloan, G. C. "Dust in planetary nebulae." Proceedings of the International Astronomical Union 12, S323 (2016): 121–27. http://dx.doi.org/10.1017/s1743921317002034.

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AbstractInfrared spectra from the Spitzer Space Telescope trace the evolution of carbon-rich dust from the asymptotic giant branch (AGB) to young planetary nebulae (PNe). On the AGB, amorphous carbon dominates the dust, but SiC and MgS also appear. In more evolved systems with warmer central stars, the spectra reveal the unidentified 21 μm feature, features from aliphatic hydrocarbons, and spectra from polycyclic aromatic hydrocarbons (PAHs), often with shifted feature positions indicative of the presence of aliphatics. More evolved systems with hot central stars show more typical PAH spectra,

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22

Griffin, Ian, C. J. Skinner, and B. R. Whitmore. "Observations and Models for Red Giants with Unusual Dust." International Astronomical Union Colloquium 106 (1989): 367. http://dx.doi.org/10.1017/s0252921100063259.

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We present near IR (H, K and L band) medium resolution (ƛ/Δƛ ∼ 600) spectra for a selection of 9 red giants which have previously been shown to exhibit anomalous dust emission as characterised by their IRAS LRS spectra. The objects observed (during UKIRT and AAT service time) include Carbon stars whose LRS spectra show the 9.7μm silicate feature and also M stars whose LRS spectra display an 11.3μm feature similar to that usually associated with emission from SiC dust grains.

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23

Nordsiek, Sven, and Andreas Weller. "A new approach to fitting induced-polarization spectra." GEOPHYSICS 73, no. 6 (2008): F235—F245. http://dx.doi.org/10.1190/1.2987412.

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Best fitting of induced-polarization (IP) spectra by different models of Cole-Cole type evidences discrepancies in the resulting model parameters. The time constant determined from the same data could vary in magnitude over several decades. This effect, which makes an evaluation of the results of different models nearly impossible, is demonstrated by induced polarization measurements in the frequency range between [Formula: see text] and [Formula: see text] on thirteen mixtures of quartz sand and slag grains. The samples differ in size and the amount of the slag grains. Parameters describing t

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24

Kwok, Sun. "From Stardust to Meteorites: The Synthesis of Inorganic and Organic Grains in AGB and Post-AGB Stars." Symposium - International Astronomical Union 213 (2004): 177–80. http://dx.doi.org/10.1017/s0074180900193222.

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Infrared spectroscopic observations of the circumstellar envelopes of AGB and post-AGB stars have identified a variety of inorganic grains including amorphous silicates, crystalline silicates, silicon carbide, carbonates, corundum, spinels and possibly rutiles. Isotopic studies of meteorites have also identified similar species of presolar origin. The existence of aromatic and aliphatic features in the spectra of post-AGB stars suggests that organic compounds in solid-state form are made during the post-AGB phase of stellar evolution. These features show similarity with the IR spectra of kerog

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25

Riboldi, Alessandro, Laura Borgese, Irene Vassalini, et al. "Micro-Raman Spectroscopy Investigation of Crystalline Phases in EAF Slag." Applied Sciences 10, no. 12 (2020): 4115. http://dx.doi.org/10.3390/app10124115.

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Electric arc furnace (EAF) slags were investigated by micro-Raman spectroscopy. A slag sample characterised by well-developed crystalline phases was obtained. The EDXS elemental composition made it possible to recognize the grains corresponding to the brownmillerite, larnite and magnesioferrite phases, as identified by XRD in the same powdered sample. The grains were collected and analysed by µ-Raman spectra, and the results showed good reproducibility in each grain and good agreement with spectra of the phases reported in the literature. A Raman database devoted to crystalline phases of EAF s

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26

Lamy, P. L., J. Lefevre, J. Millet, and J. P. Lafon. "Electrostatic Charge of Interplanetary Dust Grains: New Results." International Astronomical Union Colloquium 85 (1985): 335–39. http://dx.doi.org/10.1017/s0252921100084876.

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AbstractA continuing program aimed at improving the determination of the charge of interplanetary as well as cosmic grains is presented. Recent data have been combined to generate two high-resolution solar spectra corresponding to the maximum & minimum of activity. The energy distribution of photoelectrons emitted by quartz grains under solar irradiation is calculated using the new laboratory measurements of Quemerais et al. (this volume). Finally, the method of Lafon, Millet and Lamy (Astron. Astrophys., 95,295, 1981) is used to find the electrostatic potential of these grains.

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27

Koike, C., and H. Shibai. "Mid- and far-infrared absorption spectra of fine fused quartz grains." Monthly Notices of the Royal Astronomical Society 269, no. 4 (1994): 1011–18. http://dx.doi.org/10.1093/mnras/269.4.1011.

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28

Kurumada, M., C. Koike, and C. Kaito. "Laboratory production of and alumina grains and their characteristic infrared spectra." Monthly Notices of the Royal Astronomical Society 359, no. 2 (2005): 643–47. http://dx.doi.org/10.1111/j.1365-2966.2005.08937.x.

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29

Volodina, E. A., A. V. Tevelev, A. A. Borisenko, et al. "DEBRIS SOURCE AREA EVOLUTION DURING FORMATION OF THE URALIAN FOREDEEP AT THE SAKMARIAN STAGE OF THE EARLY PERMIAN ACCORDING TO U-Pb LA-ICP-MS ISOTOPE DATING OF DETRITAL ZIRCONS." Geodynamics & Tectonophysics 16, no. 2 (2025): 0824. https://doi.org/10.5800/gt-2025-16-2-0824.

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The article presents the results of studying the sources of terrigenous material deposition in the Uralian foredeep according to U-Pb dating of detrital zircons from terrigenous rocks of four stratigraphic levels of the Kapysov formation (Sakmarian stage). The Kapysov formation is one of the formations of the Lower Permian section of the Yuryuzano-Sylvenskaya depression in the Uralian foredeep. It is composed of conglomerates and sandstones and unconformably overlies the underlying formations. Samples 14110 and 14110-1 were taken from the same section exposed in the quarry near the village of

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30

Zhao, Hong Jie, Ji Zhou, Zhi Lun Gui, and Long Tu Li. "Complex Impedance Spectroscopy of Bi-Substituted Yttrium Iron Garnet (YIG)." Key Engineering Materials 336-338 (April 2007): 709–11. http://dx.doi.org/10.4028/www.scientific.net/kem.336-338.709.

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The effects of Bi-substitution on the complex impedance spectra of yttrium iron garnet (YIG) were studied in this paper. The polycrystalline yttrium iron garnet Y2BiFe5O12 (YIG: Bi) and Y3Fe5O12 (YIG) samples were prepared by solid-reaction method. The complex impedance spectra were measured in the frequency range from 1 KHz to 100MHz at several temperatures between 210oC and 500oC. The complex impedance sample shows that the YIG: Bi can be represented by double Cole-Cole semicircles, and the YIG can be represented by a single Cole semicircle. The physical structure of the specimen was visuali

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31

Rouillé, Gaël, Tino Kirchhuebel, Marcel Rink, et al. "Identification of vibrational excitations and optical transitions of the organic electron donor tetraphenyldibenzoperiflanthene (DBP)." Physical Chemistry Chemical Physics 17, no. 45 (2015): 30404–16. http://dx.doi.org/10.1039/c5cp03761a.

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32

Blanco, A., V. Orofino, E. Bussoletti, S. Fonti, L. Colangeli, and J. R. Stephens. "Laboratory Spectra of Amorphous and Crystalline Olivine: An Application to Comet Halley IR Spectrum." International Astronomical Union Colloquium 126 (1991): 125–28. http://dx.doi.org/10.1017/s025292110006663x.

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AbstractAmong the various silicates proposed as components of cosmic dust grains, olivine is considered one of the most likely materials. In this work we present the infrared spectra of three different types of olivine grains: crystalline, amorphous and synthetic (also amorphous). While the first and second sample derive from the same natural mineral, the third one has been prepared in the laboratory according to the relative cosmic abundances of the elements. The experimental data are used to fit the emission feature observed in the comet Halley spectrum between 8 and 13μm.Satisfactory result

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Wei, Chenxi, Yanshuai Hong, Yangchao Tian, Xiqian Yu, Yijin Liu, and Piero Pianetta. "Quantifying redox heterogeneity in single-crystalline LiCoO2 cathode particles." Journal of Synchrotron Radiation 27, no. 3 (2020): 713–19. http://dx.doi.org/10.1107/s1600577520002076.

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Active cathode particles are fundamental architectural units for the composite electrode of Li-ion batteries. The microstructure of the particles has a profound impact on their behavior and, consequently, on the cell-level electrochemical performance. LiCoO2 (LCO, a dominant cathode material) is often in the form of well-shaped particles, a few micrometres in size, with good crystallinity. In contrast to secondary particles (an agglomeration of many fine primary grains), which are the other common form of battery particles populated with structural and chemical defects, it is often anticipated

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Wang, Jin, Xuemin Wang, Jian Yu, et al. "Tailoring the Grain Size of Bi-Layer Graphene by Pulsed Laser Deposition." Nanomaterials 8, no. 11 (2018): 885. http://dx.doi.org/10.3390/nano8110885.

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Improving the thermoelectric efficiency of a material requires a suitable ratio between electrical and thermal conductivity. Nanostructured graphene provides a possible route to improving thermoelectric efficiency. Bi-layer graphene was successfully prepared using pulsed laser deposition in this study. The size of graphene grains was controlled by adjusting the number of pulses. Raman spectra indicated that the graphene was bi-layer. Scanning electron microscopy (SEM) images clearly show that graphene changes from nanostructured to continuous films when more pulses are used during fabrication.

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Klenner, Fabian, Frank Postberg, Jon Hillier, et al. "Analogue spectra for impact ionization mass spectra of water ice grains obtained at different impact speeds in space." Rapid Communications in Mass Spectrometry 33, no. 22 (2019): 1751–60. http://dx.doi.org/10.1002/rcm.8518.

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Greenberg, J. Mayo, and Willem Schutte. "Infrared Spectral Identification of Complex Organic Molecules in Interstellar Grains." Symposium - International Astronomical Union 112 (1985): 145–50. http://dx.doi.org/10.1017/s0074180900146455.

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The chemical evolution of interstellar grains leads ultimately to a composition consisting largely of complex organic molecules. Comparison of infrared absorption spectra of laboratory produced analogue materials with astronomical observations confirm the presence of similar molecules in interstellar space. The abundance of this complex organic matter derived from the strength of the absorption bands is of the order of ten million solar masses and is almost certainly as large or larger than all conceivable planets.

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Sikora, Magdalena, Marina Valek, Zdenka Šušić, Vera Santo, and Dario Brdarić. "Tree Pollen Spectra and Pollen Allergy Risk in the Osijek-Baranja County." Archives of Industrial Hygiene and Toxicology 64, no. 1 (2013): 115–22. http://dx.doi.org/10.2478/10004-1254-64-2013-2235.

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The forests of north-eastern Croatia, as well as various plants and trees in the parks and streets of the Osijek-Baranja County, produce large amounts of pollen during the pollen season, which can cause allergy symptoms in pollen sensitive individuals. The aim of this study was to determine the most frequent types of pollen in this area and estimate possible health risks, especially the risk of allergy. In 2009 and 2010, the staff of the Health Ecology Department of the Osijek Public Health Institute monitored tree pollen concentrations in four cities from the Osijek - Baranja County (Osijek,

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Smith, R. G., G. Robinson, and A. R. Hyland. "Molecular Ices as Temperature Indicators in the ISM." Publications of the Astronomical Society of Australia 10, no. 3 (1993): 241–46. http://dx.doi.org/10.1017/s1323358000025765.

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AbstractMolecular ices are a common component of the dust in many molecular clouds and circumstellar shells. The most abundant molecule, H2O, has several infrared spectral features which have strongly temperature dependent shapes (FWHM) and peak wavelengths. This paper describes how a study of these features, both astronomically and in the laboratory, can lead to constraints on the temperatures of interstellar dust grains. This is demonstrated in part by comparing several astronomical spectra with laboratory spectra of H2O ice.

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Ricci, Claudio, and Stéphane Paltani. "Ray-tracing Simulations and Spectral Models of X-Ray Radiation in Dusty Media." Astrophysical Journal 945, no. 1 (2023): 55. http://dx.doi.org/10.3847/1538-4357/acb5a6.

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Abstract Dust can play an important role in shaping the X-ray spectra and images of astrophysical sources. In this work we report on the implementation of dust in the ray-tracing platform RefleX. We illustrate the different effects associated with the interaction between X-ray photons and dust grains, such as dust scattering, near-edge X-ray absorption fine structures, and shielding. We show how the cross sections of the photon–gas interaction change depending on the fraction of metals in dust grains (i.e., the dust depletion factor). We compare RefleX simulations to the most widely used absor

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Pankin, Dmitrii, Anastasia Povolotckaia, Eugene Borisov, et al. "Investigation of Spectroscopic Peculiarities of Ergot-Infected Winter Wheat Grains." Foods 12, no. 18 (2023): 3426. http://dx.doi.org/10.3390/foods12183426.

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Wheat has played an important role in human agriculture since ancient times. Increasing rates of processed wheat product fabrication require more and more laboratory studies of product quality. This, in turn, requires the use, in production and in field conditions, of sufficiently accurate, fast and relatively low-cost quality control methods, including the detection of fungal diseases. One of the most widespread fungal diseases of wheat in the world is ergot caused by the fungi genus Claviceps. Optical methods are promising for this disease identification due to the relative ease of implement

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V. Pavlenko, Yakiv. "Formation of the Optical Spectra of the Coolest M- and L-dwarfs and Lithium Abundances in their Atmospheres." Symposium - International Astronomical Union 198 (2000): 454–59. http://dx.doi.org/10.1017/s007418090016704x.

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Theoretical aspects of modeling of spectra of late M- and L-dwarfs are discussed. We show, that the processes of formation of spectra of M- and L-dwarfs are basically different. Instead of the case of M-dwarfs, atoms of Ti and VO should be depleted into grains in the atmospheres of L-dwarfs. Overall shape of the L-dwarf spectra is governed by the K I + Na I resonance line wings of the huge strength. To fit lithium lines observed in spectra of the coolest dwarfs we used two additional suggestions: a) there are some extra depletions of molecular species absorbed in the optical spectra of L-dwarf

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Ciesielski, Arkadiusz, Lukasz Skowronski, Ewa Górecka, Jakub Kierdaszuk, and Tomasz Szoplik. "Growth model and structure evolution of Ag layers deposited on Ge films." Beilstein Journal of Nanotechnology 9 (January 8, 2018): 66–76. http://dx.doi.org/10.3762/bjnano.9.9.

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We investigated the crystallinity and optical parameters of silver layers of 10–35 nm thickness as a function 2–10 nm thick Ge wetting films deposited on SiO2 substrates. X-ray reflectometry (XRR) and X-ray diffraction (XRD) measurements proved that segregation of germanium into the surface of the silver film is a result of the gradient growth of silver crystals. The free energy of Ge atoms is reduced by their migration from boundaries of larger grains at the Ag/SiO2 interface to boundaries of smaller grains near the Ag surface. Annealing at different temperatures and various durations allowed

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Leary, Ryan J., M. Elliot Smith, and Paul Umhoefer. "Mixed eolian–longshore sediment transport in the late Paleozoic Arizona shelf and Pedregosa basin, U.S.A.: A case study in grain-size analysis of detrital-zircon datasets." Journal of Sedimentary Research 92, no. 8 (2022): 676–94. http://dx.doi.org/10.2110/jsr.2021.101.

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ABSTRACT Detrital-zircon U–Pb geochronology has revolutionized sediment provenance studies over the last two decades, and zircon has been successfully analyzed from nearly all sedimentary lithologies, depositional environments, and sediment grain sizes. However, despite the ubiquity of this method and the far-reaching interpretations supported by detrital-zircon data, few studies have investigated the potential role of zircon grain size on age spectra and provenance interpretation. In this study, we investigate the connections between sample grain size, zircon grain size, U–Pb age spectra, and

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Agashev, A. M., M. V. Chervyakovskaya, S. L. Votyakov, et al. "Optical-spectroscopic and isotope-geochemical characteristics of zircons from diamond-bearing placers in Yakutia as indicators of diamond ore bodies." LITHOSPHERE (Russia) 24, no. 2 (2024): 284–99. http://dx.doi.org/10.24930/1681-9004-2024-24-2-284-299.

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Research subject. Zircon grains from diamond placers of the Molodo and Ebelyakh rivers of the Yakut Arctic. Aim. To study the indicator characteristics of zircon to determine sources of diamonds and ways of their transfer to placers; to analyze optical-spectroscopic and isotope-geochemical parameters of zircon grains, their microelemental, U-Pb, and Lu-Hf isotope composition. Materials and methods. A LA-ICP-MS analysis of the U-Pb isotopic and trace element composition of zircon was carried out using a NexION 300S mass spectrometer with an NWR 213 attachment. An analysis of the Lu-Hf isotope s

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Jankovskis, J., V. Yurshevich, and G. Rankis. "Analysis of Grains Distribution Effects on the Magnetic Spectra of Polycrystalline Ferrites." Le Journal de Physique IV 07, no. C1 (1997): C1–203—C1–204. http://dx.doi.org/10.1051/jp4:1997176.

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Hashimoto, Tetsuo, Noriyuki Sugai, Hisanobu Sakaue, Kenya Yasuda, and Nobutoshi Shirai. "Thermoluminescence (TL) spectra from quartz grains using on-line TL-spectrometric system." GEOCHEMICAL JOURNAL 31, no. 4 (1997): 189–201. http://dx.doi.org/10.2343/geochemj.31.189.

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Koike, Chiyoe, Hiroichi Hasegawa, and Takeshi Hattori. "Grain size dependence of far-infrared extinction spectra of amorphous fine grains." Astrophysics and Space Science 134, no. 1 (1987): 95–102. http://dx.doi.org/10.1007/bf00636456.

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Dridi, Wassim, Mohamed Faouzi Zid, and Miroslaw Maczka. "Electrical and Vibrational Studies of Na2K2Cu(MoO4)3." Advances in Materials Science and Engineering 2017 (2017): 1–8. http://dx.doi.org/10.1155/2017/6123628.

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The complex impedance of Na2K2Cu(MoO4)3 material has been investigated in the temperature range of 653–753 K and in the frequency range of 40 Hz–5 MHz. Electrical behavior of the studied material is explained through an equivalent circuit model which takes into account the contributions of grains and grains boundaries. The number of vibrational modes was calculated using group theoretical approach. The infrared and Raman spectra have also been measured and vibrational assignment has been proposed.

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Jäger, Cornelia, Alexey Potapov, Gaël Rouillé, and Thomas Henning. "Laboratory experiments on cosmic dust and ices." Proceedings of the International Astronomical Union 15, S350 (2019): 27–34. http://dx.doi.org/10.1017/s1743921319009682.

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AbstractThe existence of cosmic dust is attested by the interstellar extinction and polarization, IR emission and absorption spectra, and elemental depletion patterns. Dust grains are efficiently processed or even destroyed in shocks, molecular clouds, or protoplanetary disks. A considerable amount of dust has to be re-formed in the ISM. In various astrophysical environments, dust grains are covered by molecular ices and therefore contribute or catalytically influence the chemical reactions in these layers. Laboratory experiments are desperately required to understand the evolution of grains a

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Krelowski, Jacek, Jacek Papaj, and Walter Wegner. "Residual extinction effects in spectra of newly formed stars." Symposium - International Astronomical Union 137 (1990): 293–97. http://dx.doi.org/10.1017/s0074180900187893.

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Extinction laws observed in spectra of Be stars are shown to be evidently different from the mean extinction curve. They do not contain in many cases the prominent extinction feature - the 2200A bump. The results are derived both from multicolour (ranging from the far-IR until the ultraviolet ANS) photometry and from TD-1 UV spectra. It is strongly suggested that the observed extinction phenomena are originated in circumstellar, disk-shaped shells as the shape of resultant extinction curve suggests both the presence of big, core-mantle grains and continuous infrared emission of circumstellar o

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