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Journal articles on the topic 'Spectral curve'

Author: Grafiati

Published: 2 June 2025

Last updated: 31 July 2025

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1

Buslov, D. K., L. A. Meleshchenko, and N. A. Nikonenko. "Spectral-curve smoothing." Journal of Applied Spectroscopy 52, no. 6 (1990): 664–68. http://dx.doi.org/10.1007/bf00662207.

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Buslov, Dmitrii K., and Nataliya A. Nikonenko. "Regularized Method of Spectral Curve Deconvolution." Applied Spectroscopy 51, no. 5 (1997): 666–72. http://dx.doi.org/10.1366/0003702971941070.

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A regularized method of spectral curve deconvolution is proposed. This method is based on three fundamental principles: the regularized method of solving the convolution equation; the use, instead of the apodization function, of the digital low-pass filter, which permits exact knowledge of its characteristics; and the use of the Fourier transform modulus of the spectrum being treated for obtaining a priori information about the frequency characteristics of the solution and noise, required for determination of the optimum parameters of the regularizing operator. The regularized method of de-con

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3

Peterson, Eric. "Coalgebraic formal curve spectra and spectral jet spaces." Geometry & Topology 24, no. 1 (2020): 1–47. http://dx.doi.org/10.2140/gt.2020.24.1.

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4

Moore-Ede, Martin, Anneke Heitmann, and Rainer Guttkuhn. "Circadian Potency Spectrum with Extended Exposure to Polychromatic White LED Light under Workplace Conditions." Journal of Biological Rhythms 35, no. 4 (2020): 405–15. http://dx.doi.org/10.1177/0748730420923164.

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Electric light has enabled humans to conquer the night, but light exposure at night can disrupt the circadian timing system and is associated with a diverse range of health disorders. To provide adequate lighting for visual tasks without disrupting the human circadian timing system, a precise definition of circadian spectral sensitivity is required. Prior attempts to define the circadian spectral sensitivity curve have used short (≤90-min) monochromatic light exposures in dark-adapted human subjects or in vitro dark-adapted isolated retina or melanopsin. Several lines of evidence suggest that

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5

Farwell, S. O., and C. T. Kagel. "Detection of Spectral Overlap Interference in ICP-AES with an Empirical Linewidth Ratio Technique." Applied Spectroscopy 40, no. 7 (1986): 944–48. http://dx.doi.org/10.1366/0003702864508043.

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ICP-AES line intensity data were fitted to a minimum-curvature smooth curve generated with the aid of a cubic semispline algorithm. These spline-fitted curves were used to obtain linewidth ratios which can provide accurate indication of spectral overlap with the use of only sample and standard spectra.

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Tretiakov, Igor Aleksandrovich, and Vladimir Vasilevich Danilov. "RESEARCH OF RADIO FREQUENCY SPECTROGRAMS USING METHODS OF LINGUISTIC ANALYSIS." Vestnik of Astrakhan State Technical University. Series: Management, computer science and informatics 2020, no. 3 (2020): 45–51. http://dx.doi.org/10.24143/2072-9502-2020-3-45-51.

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The article presents the study of experimental curves of the spectral spectra of radio waves of the FM-range developed on a laboratory model. The algorithm was used to define sections, for which the complexity function took locally minimal values. The standard was determined for each section of the curve, in which all the arithmetic mean ordinates of all areas correspond to the certain class. For a more extended linguistic description of the experimental curves, it is proposed to compile the description taking into account the location of the curve sections on the abscissa axis. The obtained e

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Rueda, Sonia L., and Maria-Angeles Zurro. "Spectral Curves for Third-Order ODOs." Axioms 13, no. 4 (2024): 274. http://dx.doi.org/10.3390/axioms13040274.

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Spectral curves are algebraic curves associated to commutative subalgebras of rings of ordinary differential operators (ODOs). Their origin is linked to the Korteweg–de Vries equation and to seminal works on commuting ODOs by I. Schur and Burchnall and Chaundy. They allow the solvability of the spectral problem Ly=λy, for an algebraic parameter λ and an algebro-geometric ODO L, whose centralizer is known to be the affine ring of an abstract spectral curve Γ. In this work, we use differential resultants to effectively compute the defining ideal of the spectral curve Γ, defined by the centralize

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Wijayanti, Erlin, Stefanus Kristiawan, Edy Purwanto, and Senot Sangadji. "Seismic Vulnerability of Reinforced Concrete Building Based on the Development of Fragility Curve: A Case Study." Applied Mechanics and Materials 845 (July 2016): 252–58. http://dx.doi.org/10.4028/www.scientific.net/amm.845.252.

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This study aims to determine the seismic vulnerability of 5th Building of Engineering Faculty, Sebelas Maret University by developing its fragility curves. Fragility curve is a measure of probabilistic seismic performance under various ground motion. The intensity of ground motion adopted in this study is median spectral displacement, , with lognormal standard deviation, βds as uncertainty parameter. The value of lognormal standard deviation is adopted from HAZUS. The parameters of median spectral displacements are identified from the capacity spectrum curve. The capacity curve obtained from n

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Lu, Jing, Eric Y. Hsiao, Mark M. Phillips, et al. "Carnegie Supernova Project. II. Near-infrared Spectral Diversity and Template of Type Ia Supernovae." Astrophysical Journal 948, no. 1 (2023): 27. http://dx.doi.org/10.3847/1538-4357/acc100.

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Abstract We present the largest and most homogeneous collection of near-infrared (NIR) spectra of Type Ia supernovae (SNe Ia): 339 spectra of 98 individual SNe obtained as part of the Carnegie Supernova Project-II. These spectra, obtained with the FIRE spectrograph on the 6.5 m Magellan Baade telescope, have a spectral range of 0.8–2.5 μm. Using this sample, we explore the NIR spectral diversity of SNe Ia and construct a template of spectral time series as a function of the light-curve-shape parameter, color stretch s BV . Principal component analysis is applied to characterize the diversity o

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10

Gacic, Zoran, Branislav Mickovic, Luka Gacic, and Ilija Damjanovic. "New spectral templates for rhodopsin and porphyropsin visual pigments." Archives of Biological Sciences 71, no. 1 (2019): 103–10. http://dx.doi.org/10.2298/abs180822052g.

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A four-parameter model of spectral sensitivity curves was developed. Empirical equations were designed for A1- and A2-based visual pigments with the main ?-band maximum absorptions (?max) from 350 nm, near the ultraviolet, up to 635 nm in the far-red part of the spectrum. Subtraction of the ?-band from the full absorbance spectrum left a ??-band? described by a ?max-dependent Gaussian equation. Compatibility of our templates with A1- and A2-based spectra was tested on the electroretinographic (ERG-derived) scotopic action spectra recorded in dogfish shark, eel, Prussian carp and perch. To more

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11

Chekhov, Leonid, and Paul Norbury. "Topological recursion with hard edges." International Journal of Mathematics 30, no. 03 (2019): 1950014. http://dx.doi.org/10.1142/s0129167x19500149.

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We prove a Givental type decomposition for partition functions that arise out of topological recursion applied to spectral curves. Copies of the Konstevich–Witten KdV tau function arise out of regular spectral curves and copies of the Brezin–Gross–Witten KdV tau function arise out of irregular spectral curves. We present the example of this decomposition for the matrix model with two hard edges and spectral curve [Formula: see text].

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12

Zhou, Yun Ting, Xiao Ping Du, and Ming Zhe Li. "A New Method for Spectral Matching Pretreatment." Applied Mechanics and Materials 556-562 (May 2014): 527–30. http://dx.doi.org/10.4028/www.scientific.net/amm.556-562.527.

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Since spectral curves were obtained by experiment, on the basis of the fully use of the waveform characters, a new method for spectral matching pretreatment has been proposed in this paper. Corresponding to the spectral curve, we can accurately get the spectral absorption curve of the number of bands, it can effectively suppress the effects of the noise according to the times of fitting the points. Besides, it can also prominent the peak point of the material. This method can have an effective influence on the initial period of spectral match and detailed resolution; some numerical simulations

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13

Sun, Yanlong, Xinming Qian, Yangyang Liu, Jianwei Wang, Qunbo Lv, and Mengqi Yuan. "Identification of Typical Solid Hazardous Chemicals Based on Hyperspectral Imaging." Remote Sensing 13, no. 13 (2021): 2608. http://dx.doi.org/10.3390/rs13132608.

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The identification of hazardous chemicals based on hyperspectral imaging is an important emergent means for the prevention of explosion accidents and the early warning of secondary hazards. In this study, we used a combination of spectral curve matching based on full-waveform characteristics and spectral matching based on spectral characteristics to identify the hazardous chemicals, and proposed a method to quantitatively characterize the matching degree of the spectral curves of hazardous chemicals. The results showed that the four hazardous chemicals, sulfur, red phosphorus, potassium perman

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14

Smirnov, Aleksandr O., Eugene A. Frolov, and Lada L. Dmitrieva. "On a Hierarchy of Vector Derivative Nonlinear Schrödinger Equations." Symmetry 16, no. 1 (2024): 60. http://dx.doi.org/10.3390/sym16010060.

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We propose a new hierarchy of the vector derivative nonlinear Schrödinger equations and consider the simplest multiphase solutions of this hierarchy. The study of the simplest solutions of these equations led to the following results. First, the three-leaf spectral curves Γ={(μ,λ)} of the simplest multiphase solutions have a quite simple symmetry. They are invariant with respect to holomorphic involution τ. The type of this involution depends on the genus of the spectral curve. Or the involution has the form τ:(μ,λ)→(μ,−λ), or τ:(μ,λ)→(−μ,−λ). The presence of symmetry leads to the fact that th

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15

Abuh, Samuel Onuh, Ayan Barbora, and Refael Minnes. "Metastasis diagnosis using attenuated total reflection-Fourier transform infra-red (ATR-FTIR) spectroscopy." PLOS ONE 19, no. 5 (2024): e0304071. http://dx.doi.org/10.1371/journal.pone.0304071.

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The suitability of Fourier transform infrared spectroscopy as a metastasis prognostic tool has not been reported for some cancer types. Our main aim was to show spectroscopic differences between live un-preprocessed cancer cells of different metastatic levels. Spectra of four cancer cell pairs, including colon cancer (SW480, SW620); human melanoma (WM115, WM266.4); murine melanoma (B16F01, B16F10); and breast cancer (MCF7, MDA-MB-231); each pair having the same genetic background, but different metastatic level were analyzed in the regions 1400–1700 cm-1 and 3100–3500 cm-1 using Principal Comp

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16

Wang, Kang, Zhong Ke Wu, and Jun Li Zhao. "Curve Correspondence in Two-Dimensional Space." Applied Mechanics and Materials 556-562 (May 2014): 4651–54. http://dx.doi.org/10.4028/www.scientific.net/amm.556-562.4651.

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Curve or contour correspondence has been extensively explored. Previous work was mainly concentrated on the rigid correspondence or alignment. This paper presents a spectral analysis method to resolve the problem of curves correspondence with non-rigid deformation. Using the embedding of original affinity matrix to the spectral domain, we can build the point correspondence of no-rigid deformation shapes.

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17

McCoy, Colleen A., and James A. De Haseth. "Phase Correction of Vibrational Circular Dichroic Features." Applied Spectroscopy 42, no. 2 (1988): 336–41. http://dx.doi.org/10.1366/0003702884428202.

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Several sources of phase-correction-induced spectral anomalies in FT-IR vibrational circular dichroism (VCD) spectra have been investigated. Misidentification of the zero-phase retardation position in dichroic interferograms that exhibit no optical or electronic bias can produce spectral errors. Production of such errors is from the introduction of linear phase error into the phase curve. When the zero-phase retardation position is correctly identified, other spectral anomalies, such as “reflected peaks,” can appear in VCD spectra. These peaks are readily observed in quarterwave plate referenc

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18

Mironov, Andrey E., and Dafeng Zuo. "Spectral Curve of the Halphen Operator." Proceedings of the Edinburgh Mathematical Society 60, no. 2 (2016): 451–60. http://dx.doi.org/10.1017/s0013091516000249.

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AbstractThe Halphen operator is a third-order operator of the formwhere g ≠ 2 mod(3), where the Weierstrass ℘-function satisfies the equationIn the equianharmonic case, i.e. g2 = 0, the Halphen operator commutes with some ordinary differential operator Ln of order n ≠ 0 mod(3). In this paper we find the spectral curve of the pair L3, Ln.

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19

Ruzi, M., C. Ennis, and E. G. Robertson. "Spectral curve fitting of dielectric constants." AIP Advances 7, no. 1 (2017): 015042. http://dx.doi.org/10.1063/1.4975398.

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20

Aptekarev, A. I., and D. N. Tulyakov. "Hesse Parametrization of a Spectral Curve." Mathematical Notes 104, no. 5-6 (2018): 745–48. http://dx.doi.org/10.1134/s0001434618110160.

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21

Majstorović, Snježana, Kristian Sabo, Johannes Jung, and Matija Klarić. "Spectral methods for growth curve clustering." Central European Journal of Operations Research 26, no. 3 (2018): 715–37. http://dx.doi.org/10.1007/s10100-017-0515-6.

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22

Xie, Fei, Mengxin Ren, Wei Wu, Wei Cai, and Jingjun Xu. "Chiral metasurface refractive index sensor with a large figure of merit." Applied Physics Letters 122, no. 7 (2023): 071701. http://dx.doi.org/10.1063/5.0135657.

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Metasurface refractive index ( n) sensors aim to detect the ambient n by monitoring their spectral shifts, which have found many applications in biosensing, environmental monitoring, and so on. Traditionally, a resonance peak/valley is used as a sensing signal to track the spectral shifts. To track the spectra with higher accuracy, a larger figure of merit (FoM) is desirable; however, whose values are essentially limited by the finite resonance bandwidth. Here, we demonstrate an approach to radically improve the FoM by exploiting the 90°-crossing point of the optical rotation spectral curve as

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23

Xu, Zhanghua, Hui Yu, Bin Li, et al. "Changing Relationships between Nitrogen Content and Leaf Spectral Characteristics of Moso Bamboo Leaves under Pantana phyllostachysae Chao Stress." Forests 13, no. 11 (2022): 1752. http://dx.doi.org/10.3390/f13111752.

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Nitrogen is an important indicator of vegetation health, but the relationship between changes in the leaf nitrogen content of Moso bamboo leaves under Pantana phyllostachysae Chao (PPC) stress and leaf spectra remains unclear. We analyzed the relationship between the leaf nitrogen content and leaf spectra of Moso bamboo leaves under PPC stress to investigate whether the relationship could be used to detect pests and prevent their spread. We measured the nitrogen content and leaf spectra of Moso bamboo leaves under different damage levels, identified spectral indicators that were correlated wit

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24

Moriya, Takashi J. "Light-curve and spectral properties of ultra-stripped core-collapse supernovae." Proceedings of the International Astronomical Union 12, S329 (2016): 426. http://dx.doi.org/10.1017/s1743921317000187.

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AbstractWe discuss light-curve and spectral properties of ultra-stripped core-collapse supernovae. Ultra-stripped supernovae are supernovae with ejecta masses of only ~0.1M⊙ whose progenitors lose their envelopes due to binary interactions with their compact companion stars. We follow the evolution of an ultra-stripped supernova progenitor until core collapse and perform explosive nucleosynthesis calculations. We then synthesize light curves and spectra of ultra-stripped supernovae based on the nucleosynthesis results. We show that ultra-stripped supernovae synthesize ~0.01M⊙ of the radioactiv

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25

Yan, Hua-Hui, Jing-Kun Zhao, Wei-Bin Shi, et al. "Search for DA White Dwarf Binary Candidates from LAMOST DR7." Universe 9, no. 4 (2023): 177. http://dx.doi.org/10.3390/universe9040177.

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We obtained spectroscopy data for 761 Degenerate A (DA)white dwarfs (WDs) with multiple LAMOST observations. The radial velocity (RV) of each spectrum was calculated using the cross-correlation function method (CCF), and 60 DA WD binary candidates were selected based on the variation of the RV. Then, the atmosphere parameter Teff, logg, and the mass of these DA WDs were estimated by the Balmer line fitting method and interpolation in theoretical evolution tracks, respectively. Our parameters are consistent with those from SDSS and Gaia for the common stars. No evident difference in the mass di

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Ko, Tse-Pang, Yu-Pin Chang, and Jyh-Wen Chai. "Assessment of solitary pulmonary nodules using dual-layer spectral detector computed tomography." Medicine 103, no. 41 (2024): e40014. http://dx.doi.org/10.1097/md.0000000000040014.

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We aim to quantitatively investigate the difference between benign and malignant solid pulmonary nodules that appeared on dual-energy spectral computed tomography, and assess the diagnostic accuracy of several parameters derived from computed tomography in differentiating malignant from benign pulmonary nodules. Between September 2021 and December 2022, spectral images of 71 patients (male:female = 44:27, mean age = 71.0 years) confirmed by pathology were retrospectively analyzed in the venous phase. Patients were classified into the malignant group and the benign group. The iodine concentrati

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27

Siebert, M. R., R. J. Foley, D. O. Jones, et al. "Investigating the diversity of Type Ia supernova spectra with the open-source relational data base kaepora." Monthly Notices of the Royal Astronomical Society 486, no. 4 (2019): 5785–808. http://dx.doi.org/10.1093/mnras/stz1209.

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Abstract We present a public, open-source relational data base (we name kaepora) containing a sample of 4975 spectra of 777 Type Ia supernovae (SNe Ia). Since we draw from many sources, we significantly improve the spectra by inspecting these data for quality, removing galactic emission lines and cosmic rays, generating variance spectra, and correcting for the reddening caused by both MW and host-galaxy dust. With our data base, we organize this homogenized data set by 56 unique categories of SN-specific and spectrum-specific metadata. With kaepora, we produce composite spectra of subpopulatio

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28

Ozaki, Yukihiro, Slobodan Šašić, and Jian Hui Jiang. "How Can We Unravel Complicated near Infrared Spectra?—Recent Progress in Spectral Analysis Methods for Resolution Enhancement and Band Assignments in the near Infrared Region." Journal of Near Infrared Spectroscopy 9, no. 2 (2001): 63–95. http://dx.doi.org/10.1255/jnirs.295.

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This review paper reports recent progress in spectral analysis methods for resolution enhancement and band assignments in the near infrared (NIR) region. Spectra in the NIR region are inherently rich with information on the physical and chemical properties of molecules. However, it is not always straightforward to analyse the spectra because an NIR spectrum consists of a number of overlapped bands due to overtones and combination modes. An NIR spectrum may be analysed by conventional spectral analysis methods, chemometrics or two-dimensional correlation spectroscopy. The following conventional

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29

Ghosh, K. K., and S. Soundararajaperumal. "Multifrequency Spectra of EXOSAT Blazars." Symposium - International Astronomical Union 159 (1994): 505. http://dx.doi.org/10.1017/s0074180900176788.

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BL Lacs, Highly Polarized Quasars (HPQs) and Optically Violent Variables (OVVs) are classed as blazars. Based on the multifrequency spectral properties of these objects we have classified the blazars into two groups which are as follows: – Group I - BL LacsBL Lac objects are soft X–ray sources (Hardness ratio is less than 5) with steep and flat spectral indices in the X–ray and ultraviolet bands, respectively. They are relatively less polarized (in the optical band) and low luminous objects (Mabs < −23). Radio to X–ray spectra of BL Lacs can be fitted with a single parabolic curve and these

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30

Chi, Xiao-Tong, Nian-Qiang Bai, Ming-Ying Li, Kai Deng, and Guang-Li Wang. "The Pilot Study of Spectral CT for the Diagnosis of Mediastinal Lymph Node Metastasis in Primary Lung Cancer." Journal of Medical Imaging and Health Informatics 9, no. 6 (2019): 1076–79. http://dx.doi.org/10.1166/jmihi.2019.2701.

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Objective: To investigate the application value of spectral CT for the diagnosis of mediastinal lymph node metastasis in primary lung cancer. Materials and Methods: 32 patients who had primary lung cancer with 90 enlarged mediastinal lymph nodes underwent spectral CT by using gemstone spectral imaging (GSI) mode. The spectral curves of regions of interest (ROI) in primary lung cancer and mediastinal lymph nodes were measured with GSI post-processing software. The spectral curve slope between 40 and 140 keV was calculated and compared between them for the diagnosis of mediastinal lymph node met

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31

Hartse, Hans E., W. Scott Phillips, Michael C. Fehler, and Leigh S. House. "Single-station spectral discrimination using coda waves." Bulletin of the Seismological Society of America 85, no. 5 (1995): 1464–74. http://dx.doi.org/10.1785/bssa0850051464.

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Abstract Spectral discrimination methods applied at regional distances are based on the observation that there is a difference in the frequency content of the seismic waves radiated from the source region of earthquakes and explosions. We have investigated a spectral discrimination method that exploits the scattered energy contained in the event codas of seismograms to measure the relative source excitation of earthquakes and explosions as a function of frequency. Key strengths of the coda method include the following: (1) it is not affected by source radiation pattern because the scattering p

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32

de Weijer, A. P., L. Buydens, G. Kateman, and H. M. Heuvel. "Spectral curve fitting of infrared spectra obtained from semi-crystalline polyester yarns." Chemometrics and Intelligent Laboratory Systems 28, no. 1 (1995): 149–64. http://dx.doi.org/10.1016/0169-7439(95)80047-d.

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33

Kim, Minkyoo. "Spectral curve for γ-deformed AdS/CFT". Physics Letters B 735 (липень 2014): 332–37. http://dx.doi.org/10.1016/j.physletb.2014.06.052.

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34

Dunin-Barkowski, P., P. Norbury, N. Orantin, A. Popolitov, and S. Shadrin. "DUBROVIN’S SUPERPOTENTIAL AS A GLOBAL SPECTRAL CURVE." Journal of the Institute of Mathematics of Jussieu 18, no. 3 (2017): 449–97. http://dx.doi.org/10.1017/s147474801700007x.

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We apply the spectral curve topological recursion to Dubrovin’s universal Landau–Ginzburg superpotential associated to a semi-simple point of any conformal Frobenius manifold. We show that under some conditions the expansion of the correlation differentials reproduces the cohomological field theory associated with the same point of the initial Frobenius manifold.

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Zhu, Jianxiong, Charles K. Mann, and Thomas J. Vickers. "Simultaneous Dual-Window Measurements with a Linear Photodiode Array Detector." Applied Spectroscopy 42, no. 8 (1988): 1567–71. http://dx.doi.org/10.1366/0003702884429733.

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A generally applicable method is described for simultaneous measurement of reference and analyte spectral features which would not otherwise fall within the range covered by a single linear diode array detector. The method employs dual entrance slits on the spectrometer to cause two spectral windows to overlap on the detector. The method is demonstrated for fluorescence measurement of Rhodamine B in ethanol. Recovery of the spectral information from the overlapped spectra using a least-squares fitting procedure is demonstrated. The simultaneously recorded reference measurements are shown to be

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Berestneva, O. G., I. A. Osadchaya, and I. A. Lyzin. "Computer visualization in breathing curve analysis." Siberian Journal of Clinical and Experimental Medicine 35, no. 4 (2020): 57–64. http://dx.doi.org/10.29001/2073-8552-2020-35-4-57-64.

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The aim. To study the features of the breathing process based on the breathing curve analysis in patients with various forms of bronchial asthma using computer visualization methods.Material and Methods. The experimental data comprised breathing curves registered with the MONITOR device in patients with various bronchial asthma types and a group of apparently healthy people. The original algorithm of spectral-time analysis was used to identify the characteristic features of the breathing curves in each group at the stage of digital processing.Results. Breathing curves were analyzed and typical

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Barlow, Clyde H., Katherine A. Kelly, and Jeffrey J. Kelly. "Simultaneous Determination of Hemoglobin and Myoglobin Oxygen Binding Curves by Spectral Curve Fitting." Applied Spectroscopy 46, no. 5 (1992): 758–63. http://dx.doi.org/10.1366/0003702924124763.

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A completely optical method is described for the simultaneous determination of hemoglobin and myoglobin oxygen saturation. Solution oxygen concentrations were computed from measurements of phosphorescence decay of a soluble palladium porphyrin using the Stern-Volmer quenching relationship. Visible absorption spectra were recorded of hemoglobin/myoglobin mixtures progressively deoxygenated by bacterial aerobic metabolism. Separate hemoglobin and myoglobin oxygenation curves were resolved from the spectra of solutions containing both proteins by curve fitting, with the use of singular value deco

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Ferry, A., and P. Jacobsson. "Curve Fitting and Deconvolution of Instrumental Broadening: A Simulated Annealing Approach." Applied Spectroscopy 49, no. 3 (1995): 273–78. http://dx.doi.org/10.1366/0003702953963643.

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A curve-fitting procedure based on the simulated annealing algorithm has been developed for the analysis of spectral Raman data. By the inclusion of a priori information about the instrumental broadening in the definition of the cost function that is minimized, effects of the finite instrumental resolution are eliminated from the resulting fit. The ability of the method to reproduce original band shapes is tested on synthesized spectra and FT-Raman spectra of diamond recorded at different resolutions with different apodization functions. The procedure yields the global optimum of the fitted pa

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Deng, Zhichao, Jin Wang, Zhixiong Hu, et al. "Complex Refractive Index Dispersion of Strong Absorbing Material Determined Using Internal Reflectance Spectra Measurement." Applied Spectroscopy 72, no. 9 (2018): 1349–53. http://dx.doi.org/10.1177/0003702818781589.

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Complex refractive index dispersion (CRID) of offset inks is an important spectral property that affects the quality of printing. Due to the strong absorption of offset inks, great difficulty exists when measuring their CRID. In this study, a recently proposed apparatus that can detect the internal reflectance spectra was used to measure the CRID of three strong absorbing offset inks (magenta, yellow, and cyan). Both anomalous dispersion curve and extinction coefficient curve were well determined over the spectral range of 400–750 nm. This study experimentally proves that the apparatus and rel

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40

Dagkesamanskii, R. D. "Spectral Index - Redshift Relation for Radio Galaxies and Quasars." Symposium - International Astronomical Union 175 (1996): 569–70. http://dx.doi.org/10.1017/s0074180900081882.

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Cosmological evolution of synchrotron spectra of the powerful extragalactic radio sources was studied by many authors. Some indications of such an evolution had been found firstly by analysis of ‘spectral index - flux density’ (α – S) relation for the sample of relatively strong radio sources. Later Gopal-Krishna and Steppe extended the analysis to weaker sources and found that the slope of αmed(S) curve changes dramatically at intermediate flux densities. Gopal-Krishna and Steppe pointed out that the maxima of the αmed(S) curve and of differential source counts are at almost the same flux den

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Lee, Hee Su, Youngho Cho, Bumjin Kim, et al. "Spectral Resolving of Deep Raman Spectra of PMMA–trans‐Stilbene Bilayer with Generalized 2D Correlation Spectroscopy^#." Bulletin of the Korean Chemical Society 36, no. 3 (2015): 1032–36. http://dx.doi.org/10.1002/bkcs.10197.

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Spatially offset Raman spectroscopy of bilayer analytes results in complicated spectra from each component. To separate the respective spectrum, we applied generalized two‐dimensional correlation spectroscopy (2DCOS) as a curve resolution method in comparison with principal component analysis and the multiple curve resolution–alternating least square method. Our results show that composite Raman spectra of analytes are resolved more clearly using 2DCOS than the other methods. We propose that 2DCOS improves the resolving capability using the out‐of‐phase information of spectral intensity variat

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Buslov, Dmitrii K., and Nataliya A. Nikonenko. "A Priori Estimation of the Parameters of the Method of Spectral Curve Deconvolution." Applied Spectroscopy 52, no. 4 (1998): 613–20. http://dx.doi.org/10.1366/0003702981943969.

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A method is proposed for estimating the parameters used in the deconvolution technique. The proposed method is based on the use of the Fourier transform modulus of the spectrum being treated with the purpose of obtaining information about the characteristics of the spectral bands and random measurement errors. Formulas are given that permit estimation of the values of noise variance in the experimental spectrum, the low-pass filter passband, and the contour half-width of the high-pass filter. Results are considered for the application of the proposed formulas for determining the parameters use

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Layton, H. E., E. Bruce Pitman, and Leon C. Moore. "Spectral properties of the tubuloglomerular feedback system." American Journal of Physiology-Renal Physiology 273, no. 4 (1997): F635—F649. http://dx.doi.org/10.1152/ajprenal.1997.273.4.f635.

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A simple mathematical model was used to investigate the spectral properties of the tubuloglomerular feedback (TGF) system. A perturbation, consisting of small-amplitude broad-band forcing, was applied to simulated thick ascending limb (TAL) flow, and the resulting spectral response of the TGF pathway was assessed by computing a power spectrum from resulting TGF-regulated TAL flow. Power spectra were computed for both open- and closed-feedback-loop cases. Open-feedback-loop power spectra are consistent with a mathematical analysis that predicts a nodal pattern in TAL frequency response, with no

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Reyes, Gonzalo, Walter Diaz, Carlos Toro, et al. "Copper Oxide Spectral Emission Detection in Chalcopyrite and Copper Concentrate Combustion." Processes 9, no. 2 (2021): 188. http://dx.doi.org/10.3390/pr9020188.

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In this research, the spectral detection of copper oxide is reported from different combustion tests of chalcopyrite particles and copper concentrates. Combustion experiments were performed in a bench reactor. In all the tests, the radiation emitted from the sulfide particle reactions was captured in the VIS–NIR range. The obtained spectral data were processed by using the airPLS (adaptive iteratively reweighted penalized least squares) algorithm to remove their baseline, and principal component analysis (PCA) and the multivariate curve resolution method alternate least squares (MCR-ALS) metho

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Bayer, J., S. Huber, C. Vogl, et al. "HOLISMOKES." Astronomy & Astrophysics 653 (September 2021): A29. http://dx.doi.org/10.1051/0004-6361/202040169.

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We investigate strongly gravitationally lensed type II supernovae (LSNe II) for time-delay cosmography, incorporating microlensing effects; this expands on previous microlensing studies of type Ia supernovae (SNe Ia). We use the radiative-transfer code TARDIS to recreate five spectra of the prototypical SN 1999em at different times within the plateau phase of the light curve. The microlensing-induced deformations of the spectra and light curves are calculated by placing the SN into magnification maps generated with the code GERLUMPH. We study the impact of microlensing on the color curves and

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Kore, Rugved, and Dorukalp Durmus. "Curve-Fitting Correction Method for the Nonlinear Dimming Response of Tunable SSL Devices." Technologies 11, no. 6 (2023): 162. http://dx.doi.org/10.3390/technologies11060162.

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Solid-state lighting (SSL) devices are ubiquitous in several markets, including architectural, automotive, healthcare, heritage conservation, and entertainment lighting. Fine control of the LED light output is crucial for applications where spectral precision is required, but dimming LEDs can cause a nonlinear response in its output, shifting the chromaticity. The nonlinear response of a multi-color LEDs can be corrected by curve-fitting the measured data to input dimming controls. In this study, the spectral output of an RGB LED projector was corrected using polynomial curve fitting. The accu

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Yang, Yong, Lei Wang, and Chuan Zheng Zhu. "Equivalent Brightness Fitting Calculation Method about White LEDs." Applied Mechanics and Materials 121-126 (October 2011): 2721–25. http://dx.doi.org/10.4028/www.scientific.net/amm.121-126.2721.

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White LEDs can show different correlated color temperature (abbreviated as CCT) by adjusting the luminous spectrum peak distribution and relative strength. Recent research results indicate that spectral luminous efficiency function of mesopic vision Vmes(λ) and equivalent brightness are associated with luminous spectra of light sources. A series of white LEDs with different CCT are tested and calculated, it shows white LED with higher CCT has higher mesopic vision equivalent brightness, although the brightness are identical when the tester corrected by traditional photopic vision spectral lumi

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Krepelka, Pavel, Iveta Hynstova, Roman Pytel, Fernando Pérez-Rodríguez, Jean-Michel Roger, and Petr Drexler. "Curve fitting in Fourier transform near infrared spectroscopy used for the analysis of bacterial cells." Journal of Near Infrared Spectroscopy 25, no. 3 (2017): 151–64. http://dx.doi.org/10.1177/0967033517705032.

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Infrared spectroscopy is a prominent molecular technique for bacterial analysis. Within its context, near infrared spectroscopy in particular brings benefits over other vibrational approaches; these advantages include, for example, lower sensitivity to water, high penetration depth and low cost. However, near infrared spectroscopy is not popular within microbiology, because the spectra of organic samples are difficult to interpret. We propose a comparison of spectral curve-fitting methods, namely, techniques that facilitate the interpretation of most peaks, simplify the spectra and improve the

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Ma, Qiang, Xinmeng Hou, Xiaoyue Cheng, et al. "Risk of vertebral fractures: evaluation on vertebral trabecular attenuation value and hydroxyapatite concentration in patients by chest spectral CT." British Journal of Radiology 94, no. 1119 (2021): 20200234. http://dx.doi.org/10.1259/bjr.20200234.

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Objectives: To analyze vertebral fractures risk in patients with chest scans by evaluating vertebral hydroxyapatite concentration measured on spectral CT compared to trabecular attenuation value measured on conventional CT. Methods: Our retrospective study reviewed CT of 216 patients. Analysis of vertebral (T11 – L1) hydroxyapatite concentration by spectral imaging and trabecular attenuation value by conventional CT imaging were performed in patients with chest CT examinations. Specificity, sensitivity, negative predictive value (NPV), and positive predictive value (PPV) were performed by usin

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de Rijk, Björn. "Spectra and Stability of Spatially Periodic Pulse Patterns II: The Critical Spectral Curve." SIAM Journal on Mathematical Analysis 50, no. 2 (2018): 1958–2019. http://dx.doi.org/10.1137/17m1127594.

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