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Journal articles on the topic 'Spectral band profile'

Author: Grafiati

Published: 15 July 2021

Last updated: 29 July 2025

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1

Chen, Long-Qing, Xin Zhang, Tong-Yi Zhang, H. Y. Lin, and Sanboh Lee. "Micro-Raman Spectral Analysis of the Subsurface Damage Layer in Machined Silicon Wafers." Journal of Materials Research 15, no. 7 (2000): 1441–44. http://dx.doi.org/10.1557/jmr.2000.0209.

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In the present work we studied the depth of damage layer in machined silicon wafers that was incorporated with chemical etching using micro-Raman spectroscopy. Subsurface damage causes changes in the shape and intensity for the shoulder (450–570 cm−1) of the most intense band (519 cm−1) and the second band (300 cm−1) regions of the Raman spectrum. Etching reduces the thickness of the damage layer and, hence, the intensities at the shoulder and the second band. The intensities at the shoulder and the second band become stable when the damage layer is completely etched out. The shoulder consists

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2

Merrelli, Aronne, and David D. Turner. "Comparing Information Content of Upwelling Far-Infrared and Midinfrared Radiance Spectra for Clear Atmosphere Profiling." Journal of Atmospheric and Oceanic Technology 29, no. 4 (2012): 510–26. http://dx.doi.org/10.1175/jtech-d-11-00113.1.

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Abstract The information content of high-spectral-resolution midinfrared (MIR; 650–2300 cm−1) and far-infrared (FIR; 200–685 cm−1) upwelling radiance spectra is calculated for clear-sky temperature and water vapor profiles. The wavenumber ranges of the two spectral bands overlap at the central absorption line in the CO2 ν2 absorption band, and each contains one side of the full absorption band. Each spectral band also includes a water vapor absorption band; the MIR contains the first vibrational–rotational absorption band, while the FIR contains the rotational absorption band. The upwelling sp

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3

Huang, Tzer‐Hsiang, Chia‐Chen Hsu, C. ‐T Kuo, et al. "Ruby spectral band‐profile analysis for temperature sensing." Journal of Applied Physics 75, no. 7 (1994): 3599–606. http://dx.doi.org/10.1063/1.356071.

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4

Samaranayake, Minura, Morakot Kaewmanee, Larry Leigh, and Juliana Fajardo Rueda. "Refinement of Trend-to-Trend Cross-Calibration Total Uncertainties Utilizing Extended Pseudo Invariant Calibration Sites (EPICS) Global Temporally Stable Target." Remote Sensing 17, no. 10 (2025): 1774. https://doi.org/10.3390/rs17101774.

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Cross-calibration is an essential technique for calibrating Earth observation satellite sensors, which involves taking nearly simultaneous images of a ground target to compare an uncalibrated sensor to a well-calibrated reference sensor. This study introduces the hyperspectral Trend-to-Trend (T2T) cross-calibration technique utilizing EPICS Cluster 13 Global Temporally Stable (Cluster 13-GTS) as the calibration target, offering better temporal stability than previous targets used in T2T cross-calibration by an absolute difference of 0.4%, between coefficients of variation across all bands excl

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5

RENNER, O., P. SONDHAUSS, O. PEYRUSSE, et al. "High-resolution measurements of X-ray emission from dense quasi-1D plasma: Line merging and profile modification." Laser and Particle Beams 17, no. 3 (1999): 365–75. http://dx.doi.org/10.1017/s0263034699173038.

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The precise measurements of the spectral line profiles near the short-wavelength limit of the Lyman series of Al are reported. The spatially resolved narrow-band spectra were attributed to macroscopic plasma parameters by using the results of 1D and 2D hydrodynamic plasma modeling. The gradual merging and broadening of the spectral lines Al Lyε–θ was compared to the synthetic spectra produced by atomic physics codes. The discrepancies between the experimental and theoretical data indicate the limits for applicability of standard theoretical models.

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6

Wang, Sufeng, Yutao Feng, Di Fu, et al. "Stratospheric Temperature Observations by Narrow Bands Ultra-High Spectral Resolution Sounder from Nadir-Viewing Satellites." Remote Sensing 15, no. 8 (2023): 1967. http://dx.doi.org/10.3390/rs15081967.

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Accurate stratospheric temperature observations are crucial for weather forecasts and climate change studies. This paper discusses a precise measurement method for the stratospheric temperature profile using narrow bands with ultra-high spectral resolution from nadir-viewing satellites. First, the CO2 absorption band around 15 μm is selected as the major sounding source by the calculation and analysis of the temperature Jacobian and the atmospheric molecular spectra. Next, the influence of spectral resolution, spectral range and instrumental noise on the sounding capability is analyzed, and th

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7

Wang, Hanyu, Mingyu Yang, Tao Zhang, et al. "Hyperspectral Anomaly Detection with Differential Attribute Profiles and Genetic Algorithms." Remote Sensing 15, no. 4 (2023): 1050. http://dx.doi.org/10.3390/rs15041050.

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Anomaly detection is hampered by band redundancy and the restricted reconstruction ability of spectral–spatial information in hyperspectral remote sensing. A novel hyperspectral anomaly detection method integrating differential attribute profiles and genetic algorithms (DAPGA) is proposed to sufficiently extract the spectral–spatial features and automatically optimize the selection of the optimal features. First, a band selection method with cross-subspace combination is employed to decrease the spectral dimension and choose representative bands with rich information and weak correlation. Then

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8

Ohiienko, O. V., V. N. Moiseienko, and M. D. Volnyanskij. "Effect of impurities and disordering on the photoluminescence of crystals and glasses in the system Li2O - 7GeO2." Journal of Physics and Electronics 27, no. 1 (2019): 51–56. http://dx.doi.org/10.15421/331909.

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The work is devoted to the study of photoluminescence spectra of weakly polar ferroelectric crystals Li2Ge7O15 and Li2O – 7GeO2 glasses. For all initial samples was observed the wide intensive luminescence band with maximum in the region of 525–550 nm. The spectral distribution of intensity and the position of the maximum of the band for a Li2Ge7O15 crystal depended on the excitation wavelength (λex=405 nm or 365nm were used). The spectral profile of the luminescence band was broadened in glass containing of 0.67% copper. The intensity of the luminescence band was decreased 6 times for glass d

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9

Colosimo, Santo Fedele, Vijay Natraj, Stanley P. Sander, and Jochen Stutz. "A sensitivity study on the retrieval of aerosol vertical profiles using the oxygen A-band." Atmospheric Measurement Techniques 9, no. 4 (2016): 1889–905. http://dx.doi.org/10.5194/amt-9-1889-2016.

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Abstract. Atmospheric absorption in the O2 A-band (12 950–13 200 cm−1) offers a unique opportunity to retrieve aerosol extinction profiles from space-borne measurements due to the large dynamic range of optical thickness in that spectral region. Absorptions in strong O2 lines are saturated; therefore, any radiance measured in these lines originates from scattering in the upper part of the atmosphere. Outside of O2 lines, or in weak lines, the atmospheric column absorption is small, and light penetrates to lower atmospheric layers, allowing for the quantification of aerosols and other scatterer

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10

He, Shaofang, Siqiao Tan, Luming Shen, and Qing Zhou. "Soil Organic Matter Estimation Model Integrating Spectral and Profile Features." Sensors 23, no. 24 (2023): 9868. http://dx.doi.org/10.3390/s23249868.

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The accurate measurement of soil organic matter (SOM) is vital for maintaining soil quality. We present an innovative model for SOM prediction by integrating spectral and profile features. We use PCA, Lasso, and SCARS methods to extract important spectral features and combine them with profile data. This hybrid approach significantly improves SOM prediction across various models, including Random Forest, ExtraTrees, and XGBoost, boosting the coefficient of determination (R2) by up to 26%. Notably, the ExtraTrees model, enriched with PCA-extracted features, achieves the highest accuracy with an

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11

Colosimo, S. F., V. Natraj, S. P. Sander, and J. Stutz. "A sensitivity study on the retrieval of aerosol vertical profiles using the oxygen A-band." Atmospheric Measurement Techniques Discussions 8, no. 11 (2015): 11853–91. http://dx.doi.org/10.5194/amtd-8-11853-2015.

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Abstract. Atmospheric absorption in the O2 A-band (12 950–13 200 cm−1) offers a unique opportunity to retrieve aerosol extinction profiles from space-borne measurements due to the large dynamic range of optical thickness in that spectral region. Absorptions in strong O2 lines are saturated; therefore, any radiance measured in these lines originates from scattering in the upper part of the atmosphere. Outside of O2 lines, or in weak lines, the atmospheric column absorption is small, and light penetrates to lower atmospheric layers, allowing for the quantification of aerosols and other scatterer

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12

Seredin, Pavel, Tatiana Litvinova, Yuri Ippolitov, et al. "Multivariate Spectroscopic Analysis of Protein Secondary Structures in Gingival Crevicular Fluid: Insights from FTIR Amide III Band Across Oral Disease Stages." International Journal of Molecular Sciences 26, no. 10 (2025): 4693. https://doi.org/10.3390/ijms26104693.

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This study applies multivariate data analysis to deconvolute the spectral profiles of the Amide III region in the infrared spectra of gingival crevicular fluid (GCF). This reveals the impact of major oral diseases, such as dental caries and periodontal diseases, on the transformation of the secondary structure of GCF proteins. A two-stage analytical approach was employed: first, principal component analysis (PCA) was performed to establish the main factors of variation in the data, followed by pairwise comparisons of the samples based on the results of the Amide III profile deconvolution. The

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13

Connor, B. J., V. Sherlock, G. Toon, D. Wunch, and P. Wennberg. "GFIT2: an experimental algorithm for vertical profile retrieval from near IR spectra." Atmospheric Measurement Techniques Discussions 8, no. 11 (2015): 12263–95. http://dx.doi.org/10.5194/amtd-8-12263-2015.

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Abstract. An algorithm for retrieval of vertical profiles from ground-based spectra in the near IR is described and tested. Known as GFIT2, the algorithm is primarily intended for CO2, and is used exclusively for CO2 in this paper. Retrieval of CO2 vertical profiles from ground-based spectra is theoretically possible, would be very beneficial for carbon cycle studies and the validation of satellite measurements, and has been the focus of much research in recent years. GFIT2 is tested by application both to synthetic spectra, and to measurements at two TCCON sites. We demonstrate that there are

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14

Kim, T. K., J. A. Menart, and H. S. Lee. "Nongray Radiative Gas Analyses Using the S-N Discrete Ordinates Method." Journal of Heat Transfer 113, no. 4 (1991): 946–52. http://dx.doi.org/10.1115/1.2911226.

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The S-N discrete ordinates method is applied to analyze radiative heat transfer in nongray gases. Spectral correlation between the terms in the equation of transfer is considered for black or nearly nonreflecting walls. Formulations to apply the S-N method using a narrow-band or the exponential wide-band model are presented. The net radiative wall heat fluxes and the radiative source distributions are obtained for uniform, parabolic, and boundary layer type temperature profiles, as well as for a parabolic concentration profile. The narrow- and wide-band nongray solutions are compared with gray

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15

Zhang, Yizhu, Kaixuan Zhang, Tian-Min Yan, and Yuhai Jiang. "Electron trajectory backanalysis for spectral profile in two-color terahertz generation." Journal of Physics B: Atomic, Molecular and Optical Physics 54, no. 19 (2021): 195401. http://dx.doi.org/10.1088/1361-6455/ac319c.

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Abstract The gas-phase medium ionized by two-color femtosecond field produces supercontinuum radiation ranging from the terahertz to midinfrared band. Under the strong-field approximation, the electron trajectory backanalysis is exploited to interpret the spectral profile of terahertz radiation. Meanwhile, the electron trajectory method can correlate terahertz spectral profiles and photoelectron momentum distributions (PEMDs). The coherent superposition of electron trajectories released from the consecutive cycles is found to induce the high-frequency cutoff and sharpen the spectral bandwidth

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16

Eskola, Sisko Maria, and Folke Stenman. "Interpolation of Spectral Data Using the Shift Theorem of the Discrete Fourier Transform." Applied Spectroscopy 51, no. 8 (1997): 1179–84. http://dx.doi.org/10.1366/0003702971941719.

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We present a method for interpolating discrete spectral data using the shift theorem of the discrete Fourier transform. The advantages of the method as compared to ordinary curve fitting and similar direct interpolation methods are that, being based on the discrete Fourier transform, our method is also very fast for large sample volumes if used with the fast Fourier transform (FFT) algorithm. In contrast to direct interpolation methods in spectral space, our method does not modify the modulus of the inverse Fourier transform of the shifted profile, so that the spectral content of the signal is

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17

Connor, Brian J., Vanessa Sherlock, Geoff Toon, Debra Wunch, and Paul O. Wennberg. "GFIT2: an experimental algorithm for vertical profile retrieval from near-IR spectra." Atmospheric Measurement Techniques 9, no. 8 (2016): 3513–25. http://dx.doi.org/10.5194/amt-9-3513-2016.

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Abstract. An algorithm for retrieval of vertical profiles from ground-based spectra in the near IR is described and tested. Known as GFIT2, the algorithm is primarily intended for CO2, and is used exclusively for CO2 in this paper. Retrieval of CO2 vertical profiles from ground-based spectra is theoretically possible, would be very beneficial for carbon cycle studies and the validation of satellite measurements, and has been the focus of much research in recent years. GFIT2 is tested by application both to synthetic spectra and to measurements at two Total Carbon Column Observing Network (TCCO

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18

Joshi, A., W. Wang, J. C. Pandey, et al. "X-ray confirmation of the intermediate polar IGR J16547-1916." Astronomy & Astrophysics 657 (December 21, 2021): A12. http://dx.doi.org/10.1051/0004-6361/202142193.

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Using X-ray observations from the NuSTAR and Swift satellites, we present temporal and spectral properties of an intermediate polar (IP) IGR J16547-1916. A persistent X-ray period at ∼546 s confirming the optical spin period obtained from previous observations is detected. The detection of a strong X-ray spin pulse reinforces the classification of this system as an intermediate polar. The lack of orbital or side-band periodicities in the X-rays implies that the system is accreting predominantly via a disk. A variable covering absorber appears to be responsible for the spin pulsations in the lo

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19

Duley, W. W. "Carbon Nanoparticles and Carbonaceous Solids." Proceedings of the International Astronomical Union 10, H16 (2012): 711–12. http://dx.doi.org/10.1017/s1743921314013027.

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AbstractThis paper reports on the preparation of hydrogenated amorphous carbon nano-particles whose spectral characteristics include an absorption band at 217.5 nm with the profile and characteristics of the interstellar 217.5 nm feature. Vibrational spectra of these particles also contain the features commonly observed in IR absorption and emission from dust in the diffuse interstellar medium. These materials are produced under “slow“ deposition conditions by minimizing the flux of incident carbon atoms and by reducing surface mobility.

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20

Qu, Tao, Lifeng Zhang, Yuan Wang, Xu Wang, and Jiping Guan. "Seasonal Variations in the Vertical Wavenumber Spectra of Stratospheric Gravity Waves in the Asian Monsoon Region Derived from COSMIC-2 Data." Remote Sensing 14, no. 24 (2022): 6336. http://dx.doi.org/10.3390/rs14246336.

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We used the Constellation Observing System for Meteorology, Ionosphere, and Climate-2 (COSMIC-2) dry temperature profile data from December 2019 to November 2021 to study the vertical wavenumber spectra of the potential energy of stratospheric gravity waves (GWs Ep) in the Asian monsoon region (15–45°N, 70–150°E). The GW Ep decreases with increasing vertical wavenumber, and the spectral slope varies with wavenumber. The spectral slope becomes smaller over a wavenumber range of 0.1–0.45 km−1, and larger from 0.45–1 km−1, with increasing wavenumber. The energy density distribution at middle and

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21

Gnybida, M., Ch Rümpler, and V. R. T. Narayanan. "Optimal Band Selection for the Calculation of Planck Mean Absorption Coefficients." PLASMA PHYSICS AND TECHNOLOGY 4, no. 1 (2017): 70–73. http://dx.doi.org/10.14311/ppt.2017.1.70.

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Radiative heat transfer is a major heat loss mechanism in thermal plasmas generated during arc flashes/faults in switchgear applications or during high current interruption in low voltage circuit breakers. A common way to calculate the radiation balance is by means of approximate non-gray radiation models like P1 or discrete ordinates (DOM), where the frequency dependent absorption and emission are described in a number of frequency intervals (bands) using a constant absorption coefficient in each band. Current work is focused on finding the optimal number of bands as well as band interval bou

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22

Bi, Yanmeng, Jun Yang, Caiying Wei, et al. "Atmospheric Temperature Measurements Using Microwave Hyper-Spectrum from Geostationary Satellite: Band Design, Weighting Functions and Information Content." Remote Sensing 16, no. 2 (2024): 289. http://dx.doi.org/10.3390/rs16020289.

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A passive microwave instrument will be carried by China’s geostationary microwave satellite. A microwave hyper-spectral band included by the instrument ranges from 52.6 to 57.3 GHz, and totally has 89 channels in this spectral domain. The design of the hyper-spectral band is described from the aspects of scientific objectives and specifications. The weighting functions for each channel are calculated utilizing radiative transfer simulations under clear sky conditions. Then, the information content as well as the degree of freedom for signal are computed and analyzed to characterize this hyper-

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23

Baron, Ph, Ph Ricaud, J. de la Noë, et al. "Studies for the Odin sub-millimetre radiometer. II. Retrieval methodology." Canadian Journal of Physics 80, no. 4 (2002): 341–56. http://dx.doi.org/10.1139/p01-150.

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This paper presents the first algorithm developed to retrieve atmospheric vertical profiles of trace gases from calibrated spectra measured by the sub-millimetre radiometer (SMR) onboard the Odin satellite. An estimation of atmospheric profiles is obtained by means of an inversion of the spectra using the Optimal Estimation Method. Great attention is paid to the study of the simultaneous retrieval of several species and nonlinearity effects. The measurement response is defined to give the altitude domain of a good retrieval. Main sources of measurement and forward model errors are characterize

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24

Reshetnyak, Victor, Igor Pinkevych, Timothy Bunning, and Dean Evans. "Influence of Rugate Filters on the Spectral Manifestation of Tamm Plasmon Polaritons." Materials 14, no. 5 (2021): 1282. http://dx.doi.org/10.3390/ma14051282.

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This study theoretically investigated light reflection and transmission in a system composed of a thin metal layer (Ag) adjacent to a rugate filter (RF) having a harmonic refractive index profile. Narrow dips in reflectance and peaks in transmittance in the RF band gap were obtained due to the excitation of a Tamm plasmon polariton (TPP) at the Ag–RF interface. It is shown that the spectral position and magnitude of the TPP dips/peaks in the RF band gap depend on the harmonic profile parameters of the RF refractive index, the metal layer thickness, and the external medium refractive index. The

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25

Kawakita, Hideyo, and James E. Lyke. "Formation of CN and CO Molecules in the Envelope of Nova V1391 Cas During the Near-maximum Phase." Astronomical Journal 168, no. 6 (2024): 266. http://dx.doi.org/10.3847/1538-3881/ad79f3.

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Abstract Moderate-resolution spectra (R ≈ 2700) of the classical nova V1391 Cas were obtained in the near-infrared wavelength range of 0.95–2.45 μm on UT 2020 August 14.41 using the Keck II telescope and the NIRES spectrograph. The spectral analysis revealed simultaneous detection of CO and CN molecular features. The CN red-system band was observed solely in absorption, while the CO first overtone bands, encompassing both 12CO and 13CO, displayed a combination of emission and absorption features at different velocities, resembling a P-Cygni profile. This specific CO profile is unprecedented in

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26

Chandra, Amar Deo, Jayashree Roy, P. C. Agrawal, and Manojendu Choudhury. "Study of recent outburst in the Be/X-ray binary RX J0209.6−7427 with AstroSat: a new ultraluminous X-ray pulsar in the Magellanic Bridge?" Monthly Notices of the Royal Astronomical Society 495, no. 3 (2020): 2664–72. http://dx.doi.org/10.1093/mnras/staa1041.

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ABSTRACT We present the timing and spectral studies of RX J0209.6–7427 during its rare 2019 outburst using observations with the Soft X-ray Telescope (SXT) and Large Area X-ray Proportional Counter (LAXPC) instruments on the AstroSat satellite. Pulsations having a periodicity of 9.29 s were detected for the first time by the NICER mission in the 0.2–10 keV energy band and, as reported here, by AstroSat over a broad energy band covering 0.3–80 keV. The pulsar exhibits a rapid spin-up during the outburst. Energy resolved folded pulse profiles are generated in several energy bands in 3–80 keV. To

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27

Joslin, C. G. "Collision-induced absorption in the fundamental band of nitrogen gas." Canadian Journal of Physics 65, no. 12 (1987): 1629–35. http://dx.doi.org/10.1139/p87-268.

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Compressed nitrogen gas absorbs weakly in the vicinity of its vibrational fundamental frequency (ωvib = 2330 cm−1), with an intensity proportional to the square of the density. This absorption arises through vibrational modulation of the quadrupole-induced collisional dipole moment of a pair of N2 molecules. By neglecting the small anisotropy in the N2 intermolecular potential, we represent the spectral profile as the convolution of a single-molecule vibration–rotation band with a two-molecule translational component. Information theory is used to estimate the "least biased" form for the latte

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28

Schwartz, M. J., E. E. Becklin, and B. Zuckerman. "A Deep JI Survey of the Pleiades for Freely-Floating Superplanets and Brown Dwarfs at the Deuterium Burning Limit." Symposium - International Astronomical Union 211 (2003): 185–86. http://dx.doi.org/10.1017/s0074180900210553.

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We present preliminary results from a deep near-infrared J-band and I-band photometric survey of the Pleiades for freely-floating superplanets and brown dwarfs (BD) near the deuterium burning limit (DBL). With limiting magnitudes of J=20.5 and I=23.5, we have selected candidate Pleiads on the basis of evolutionary tracks, color-magnitudes, and I-J color lower limits (non-detections at deep I-band). Likelihoods of membership will be ultimately determined by a combination of image profile analysis, spectral energy distribution, proper motion, and low-resolution measurements of near-infrared wate

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Gergely, Mathias, Maximilian Schaper, Matthias Toussaint, and Michael Frech. "Doppler spectra from DWD's operational C-band radar birdbath scan: sampling strategy, spectral postprocessing, and multimodal analysis for the retrieval of precipitation processes." Atmospheric Measurement Techniques 15, no. 24 (2022): 7315–35. http://dx.doi.org/10.5194/amt-15-7315-2022.

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Abstract. This study explores the potential of using Doppler (power) spectra from vertically pointing C-band radar birdbath scans to investigate precipitating clouds above the radar. First, the new birdbath scan strategy for the network of dual-polarization C-band radars operated by the German Meteorological Service (Deutscher Wetterdienst, DWD) is outlined, and a novel spectral postprocessing and analysis method is presented. The postprocessing algorithm isolates the weather signal from non-meteorological contributions in the radar output based on polarimetric attributes, identifies the stati

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Demattê, José Alexandre Melo, Fabrício da Silva Terra, and Carlos Fernando Quartaroli. "Spectral behavior of some modal soil profiles from São Paulo State, Brazil." Bragantia 71, no. 3 (2012): 413–23. http://dx.doi.org/10.1590/s0006-87052012005000038.

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Remote sensing has a high potential for environmental evaluation. However, a necessity exists for a better understanding of the relations between the soil attributes and spectral data. The objective of this work was to analyze the spectral behavior of some soil profiles from the region of Piracicaba, São Paulo State, using a laboratory spectroradiometer (400 to 2500 nm). The relations between the reflected electromagnetic energy and the soil physical, chemical and mineralogical attributes were analyzed, verifying the spectral variations of soil samples in depth along the profiles with their cl

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Zhou, Jianxi, Congming Dai, Pengfei Wu, and Heli Wei. "A Fast Computing Model for the Oxygen A-Band High-Spectral-Resolution Absorption Spectra Based on Artificial Neural Networks." Remote Sensing 16, no. 19 (2024): 3616. http://dx.doi.org/10.3390/rs16193616.

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A fast and accurate radiative transfer model is the prerequisite in the field of atmospheric remote sensing for limb atmospheric inversion to tackle the drawback of slow calculation speed of traditional atmospheric radiative transfer models. This paper established a fast computing model (ANN-HASFCM) for high-spectral-resolution absorption spectra by using artificial neural networks and PCA (principal component analysis) spectral reconstruction technology. This paper chose the line-by-line radiative transfer model (LBLRTM) as the comparative model and simulated training spectral data in the oxy

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32

Yan, Lin-Li, You-Li Tuo, Ming-Yu Ge, Fang-Jun Lu, Shi-Jie Zheng, and Ling-Jun Wang. "A Study on the X-Ray Pulse Profile and Spectrum of the Crab Pulsar Using NICER and Insight-HXMT's Observations." Astrophysical Journal 928, no. 2 (2022): 183. http://dx.doi.org/10.3847/1538-4357/ac581c.

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Abstract We analyze the energy dependence of the X-ray pulse profile and the phase-resolved spectra (PRS) of the Crab pulsar using observations from the Neutron star Interior Composition Explorer (NICER) and the Hard X-ray Modulation Telescope (Insight-HXMT). We parameterize the pulse profiles and quantify the evolution of these parameters in the broad energy band of 0.4–250 keV. A log-parabola function is used to fit the PRS in 2–250 keV, and the curvature of the spectrum, i.e., the evolution of the photon index with energy, as represented by the parameter β of the log-parabola model, also ch

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Weaver, John R., and Keith Horne. "Dust and the intrinsic spectral index of quasar variations: hints of finite stress at the innermost stable circular orbit." Monthly Notices of the Royal Astronomical Society 512, no. 1 (2022): 899–916. http://dx.doi.org/10.1093/mnras/stac248.

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ABSTRACT We present a study of 9 242 spectroscopically confirmed quasars with multiepoch ugriz photometry from the SDSS Southern Survey. By fitting a separable linear model to each quasar’s spectral variations, we decompose their five-band spectral energy distributions into variable (disc) and non-variable (host galaxy) components. In modelling the disc spectra, we include attenuation by dust on the line of sight through the host galaxy to its nucleus. We consider five commonly used attenuation laws, and find that the best description is by dust similar to that of the Small Magellanic Cloud, i

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Koshitaka, Hisaharu, Michiyo Kinoshita, Misha Vorobyev, and Kentaro Arikawa. "Tetrachromacy in a butterfly that has eight varieties of spectral receptors." Proceedings of the Royal Society B: Biological Sciences 275, no. 1637 (2008): 947–54. http://dx.doi.org/10.1098/rspb.2007.1614.

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This paper presents the first evidence of tetrachromacy among invertebrates. The Japanese yellow swallowtail butterfly, Papilio xuthus , uses colour vision when foraging. The retina of Papilio is furnished with eight varieties of spectral receptors of six classes that are the ultraviolet (UV), violet, blue (narrow-band and wide-band), green (single-peaked and double-peaked), red and broad-band classes. We investigated whether all of the spectral receptors are involved in colour vision by measuring the wavelength discrimination ability of foraging Papilio . We trained Papilio to take nectar whi

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Bernardini, N., R. Binet, and B. Vidal. "ATTITUDE RESTITUTION FOR MULTISPECTRAL EARTH OBSERVATION SATELLITE USING SPACE TRIANGULATION TECHNIQUE." ISPRS Annals of Photogrammetry, Remote Sensing and Spatial Information Sciences V-1-2020 (August 3, 2020): 141–49. http://dx.doi.org/10.5194/isprs-annals-v-1-2020-141-2020.

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Abstract. Earth observation satellites are equipped with navigation components (star trackers, gyroscopes) which estimates the attitude of the satellite, corresponding to its orientation in the orbital reference frame. This equipment is essential for the localisation of the images which is done a posteriori and for the registration of the different images for a pushbroom sensor. This concerns both the registration of the spectral bands and the registration of multi-temporal series. However, the required accuracy is not always compatible with the performance of the attitude restitution. Moreove

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Woo, Su-Wan, та Tae-Ho Song. "Measurement of gas temperature profile using spectral intensity from CO2 4.3 μm band". International Journal of Thermal Sciences 41, № 9 (2002): 883–90. http://dx.doi.org/10.1016/s1290-0729(02)01381-9.

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Chhotaray, Birendra, Gaurava K. Jaisawal, Sachindra Naik, and Arghajit Jana. "Broad-band study of the SMC pulsar RX J0032.9−7348 during its X-ray brightening in 2024." Monthly Notices of the Royal Astronomical Society 539, no. 4 (2025): 3437–44. https://doi.org/10.1093/mnras/staf723.

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ABSTRACT We present the results of the broadband timing and spectral analysis of the poorly understood SMC pulsar RX J0032.9−7348 (=SXP 7.02) using NuSTAR and NICER observations during its X-ray brightening in 2024. Our timing analysis revealed a pulsation period of approximately 7.02 s in the X-ray light curve. The pulse profile obtained in the broad energy range is double-peaked and asymmetric in nature and shows moderate variation with the energy. An absorbed power-law model describes the 0.5–8 keV NICER spectra well. The 3–50 keV NuSTAR spectrum is best described with an absorbed power-law

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Yousefian, F., M. Sakami, and M. Lallemand. "Recovery of Temperature and Species Concentration Profiles in Flames Using Low-Resolution Infrared Spectroscopy." Journal of Heat Transfer 121, no. 2 (1999): 268–79. http://dx.doi.org/10.1115/1.2825977.

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The temperature and species distributions in semi-transparent gaseous axisymmetric objects are retrieved by carrying out the inversion of their directional low-resolution spectral transmission and/or spectral emission in the infrared by using methods based on the solution of the radiative transfer equation. The validity domains of the hypothesis on which the low resolution inversion methods are based are discussed by comparison with the corresponding exact radiative properties generated by line-by-line descriptions. A propane-air laminar premixed flame is experimentally studied. The infrared d

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Bourdine, A., A. Barashkin, V. Burdin, et al. "Researches of Parameters of Chiral Few-Mode Optical Fiber Pilot Sample with Improved Height of Step Refractive Index Profile." Proceedings of Telecommunication Universities 7, no. 1 (2021): 6–19. http://dx.doi.org/10.31854/1813-324x-2021-7-1-6-19.

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This work presents results of researhes of fabricated pilot sample of chiral few-mode optical fiber (FMF) with induced twisting of 10 and 66 revolutions per meter, core diameter 11 µm (that almost corresponds to standard singlemode optical fibers), typical “telecommuniction” cladding diameter 125 µm and improved height of step refractive index profile. Proposed few-mode optical fiber supports 4 guided modes over “C”-band. We considered design and selection of desired technological parameters, based on results of computations, performed by both rigorous and approximation methods. Spectral curve

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Zhao, H., M. Schultheis, A. Recio-Blanco та ін. "The diffuse interstellar band around 8620 Å". Astronomy & Astrophysics 645 (24 грудня 2020): A14. http://dx.doi.org/10.1051/0004-6361/202039736.

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Context. Diffuse interstellar bands (DIBs) are interstellar absorption features that widely exist in the optical and near-infrared wavelength range. DIBs play an important role in the lifecycle of the interstellar medium and can also be used to trace the Galactic structure. Aims. We developed a set of procedures to automatically detect and measure the DIB around 8620 Å (the Gaia DIB) for a wide range of temperatures. The method was tested on ~5000 spectra from the Giraffe Inner Bulge Survey (GIBS) that has a spectral window similar to that of the Gaia–RVS spectra. Based on this sample, we stud

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Wang, Yuxuan, Xiaobing Sun, Honglian Huang, Rufang Ti, Xiao Liu, and Yizhe Fan. "Study on Influencing Factors of the Information Content of Satellite Remote-Sensing Aerosol Vertical Profiles Using Oxygen A-Band." Remote Sensing 15, no. 4 (2023): 948. http://dx.doi.org/10.3390/rs15040948.

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Aerosol vertical distribution is decisive and hard to be constrained. It is of great significance for the study of atmospheric climate and environment. Oxygen absorption A-bands (755–775 nm) provide a unique opportunity to acquire vertical aerosol profiles from satellites over a large spatial coverage. To investigate the ability of O2 A-bands in retrieving aerosol vertical distribution, the dependence of retrieval on satellite observation geometry, spectral resolution, signal-to-noise ratio (SNR), size distribution, and a priori knowledge is quantified using information content theory. This wo

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Kuzio, Olivia, and Susan Farnand. "Color Accuracy-Guided Data Reduction for Practical LED-based Multispectral Imaging." Archiving Conference 2021, no. 1 (2021): 65–70. http://dx.doi.org/10.2352/issn.2168-3204.2021.1.0.15.

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The color accuracy of an LED-based multispectral imaging strategy has been evaluated with respect to the number of spectral bands used to build a color profile and render the final image. Images were captured under select illumination conditions provided by 10-channel LED light sources. First, the imaging system was characterized in its full 10-band capacity, in which an image was captured under illumination by each of the 10 LEDs in turn, and the full set used to derive a system profile. Then, the system was characterized in increasingly reduced capacities, obtained by reducing the number of

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Gilmore, Adam M., Shigeru Itoh, and Govindjee. "Global spectral–kinetic analysis of room temperature chlorophyll a fluorescence from light-harvesting antenna mutants of barley." Philosophical Transactions of the Royal Society of London. Series B: Biological Sciences 355, no. 1402 (2000): 1371–84. http://dx.doi.org/10.1098/rstb.2000.0699.

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This study presents a novel measurement, and simulation, of the time–resolved room temperature chlorophyll a fluorescence emission spectra from leaves of the barley wild–type and chlorophyll– b –deficient chlorina ( clo ) f2 and f104 mutants. The primary data were collected with a streak–camera–based picosecond–pulsed fluorometer that simultaneously records the spectral distribution and time dependence of the fluorescence decay. A new global spectral–kinetic analysis programme method, termed the double convolution integral (DCI) method, was developed to convolve the exciting laser pulse shape

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Rodin, Alexander V., Dmitry V. Churbanov, Sergei G. Zenevich, et al. "Vertical wind profiling from the troposphere to the lower mesosphere based on high-resolution heterodyne near-infrared spectroradiometry." Atmospheric Measurement Techniques 13, no. 5 (2020): 2299–308. http://dx.doi.org/10.5194/amt-13-2299-2020.

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Abstract. We propose a new technique of remote wind measurements based on Doppler analysis of a CO2 absorption line in the 1.605 µm overtone band measured in the direct Sun observation geometry. Heterodyne spectroradiometric measurements of the solar radiation passing through the atmosphere provide an unprecedented spectral resolution up to λ/δλ∼6×107, with a signal-to-noise ratio of more than 100. The shape of the individual rotational line profile provides an unambiguous relationship between the offset from the line center and the altitude at which the respective part of the line profile is

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Eie, Sujin, Toshio Terasawa, Takuya Akahori, et al. "Multi-frequency radio observations of the radio-loud magnetar XTE J1810−197." Publications of the Astronomical Society of Japan 73, no. 6 (2021): 1563–74. http://dx.doi.org/10.1093/pasj/psab098.

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Abstract We report on the multi-frequency multi-epoch radio observations of the magnetar XTE J1810−197, which exhibited a radio outburst from 2018 December after its 10-year quiescent period. We performed quasi-simultaneous observations with VERA (22 GHz), Hitachi (6.9 GHz and 8.4 GHz), Kashima (2.3 GHz), and Iitate (0.3 GHz) radio telescopes located in Japan to trace the variability of the magnetar radio pulsations during the observing period from 2018 December 13 to 2019 June 12. The pulse width becomes narrower as the observing frequency goes higher, analogous to the general profile narrowi

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Lyu, Fen, Ji-Gui Cheng, En-Wei Liang, Can-Min Deng, Tao An, and Qing Lin. "Confining Burst Energy Function and Spectral Fringe Pattern of FRB 20121102A with Multifrequency Observations." Astrophysical Journal 941, no. 2 (2022): 127. http://dx.doi.org/10.3847/1538-4357/aca297.

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Abstract The observed spectral shapes variation and tentative bimodal burst energy distribution (E-distribution) of fast radio burst (FRB) 20121102A with the FAST telescope are great puzzles. Adopting the published multifrequency data observed with the FAST and Arecibo telescopes at L band and the Green Bank Telescope (GBT) at C band, we investigate these puzzles through Monte Carlo simulations. The intrinsic energy function (E-function) is modeled as dp / dE ∝ E − α E , and the spectral profile is described as a Gaussian function. A fringe pattern of its spectral peak frequency (ν p ) in 0.5–

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Plastun, A. S., and A. I. Konuykhov. "Spectral Characteristics of a photonic bandgap fiber." Computer Optics 42, no. 2 (2018): 236–43. http://dx.doi.org/10.18287/2412-6179-2018-42-2-236-243.

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With the help of numerical simulation, we study the propagation of light in an all-glass photonic crystal fiber. A comparison of the spectral characteristics of a fiber with the idealized hexagonal structure and a fiber with transverse profile deformations is conducted. The calculations use methods based on a spatial Fourier transform. It is shown that total internal reflection modes and the fundamental mode of the photonic bandgap can be excited simultaneously. Structural deformation of a photonic crystal fiber results in the shifting and narrowing of the photonic bandgap. Excitation of the t

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Heise, H. Michael, Sven Delbeck, and Ralf Marbach. "Noninvasive Monitoring of Glucose Using Near-Infrared Reflection Spectroscopy of Skin—Constraints and Effective Novel Strategy in Multivariate Calibration." Biosensors 11, no. 3 (2021): 64. http://dx.doi.org/10.3390/bios11030064.

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For many years, successful noninvasive blood glucose monitoring assays have been announced, among which near-infrared (NIR) spectroscopy of skin is a promising analytical method. Owing to the tiny absorption bands of the glucose buried among a dominating variable spectral background, multivariate calibration is required to achieve applicability for blood glucose self-monitoring. The most useful spectral range with important analyte fingerprint signatures is the NIR spectral interval containing combination and overtone vibration band regions. A strategy called science-based calibration (SBC) ha

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Belhekar, A. A., M. S. Agashe, and C. I. Jose. "Conformational equilibria in n-alkanols. Infrared spectral deconvolution of the unsymmetric hydroxyl band profile." Journal of the Chemical Society, Faraday Transactions 86, no. 10 (1990): 1781. http://dx.doi.org/10.1039/ft9908601781.

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Chan, Ka Lok, Pieter Valks, Sander Slijkhuis, Claas Köhler, and Diego Loyola. "Total column water vapor retrieval for Global Ozone Monitoring Experience-2 (GOME-2) visible blue observations." Atmospheric Measurement Techniques 13, no. 8 (2020): 4169–93. http://dx.doi.org/10.5194/amt-13-4169-2020.

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Abstract. We present a new total column water vapor (TCWV) retrieval algorithm in the visible blue spectral band for the Global Ozone Monitoring Experience 2 (GOME-2) instruments on board the European Organisation for the Exploitation of Meteorological Satellites (EUMETSAT) Metop satellites. The blue band algorithm allows the retrieval of water vapor from sensors which do not cover longer wavelengths, such as the Ozone Monitoring Instrument (OMI) and the Copernicus atmospheric composition missions Sentinel-5 Precursor (S5P), Sentinel-4 (S4) and Sentinel-5 (S5). The blue band algorithm uses the

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