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Journal articles on the topic 'Extinction spectrum'

Author: Grafiati

Published: 28 May 2022

Last updated: 31 July 2025

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1

Zenhom, Heba, Ahmed Ghitas, Mohamed M. Abdelwahab, Mohamed S. Alnawawy, Amir H. Hassan, and Ahmed Abulwfa. "Impact of atmospheric extinction coefficient on the solar spectrum at selective wavelengths at Helwan in Egypt." IOP Conference Series: Materials Science and Engineering 1269, no. 1 (2022): 012011. http://dx.doi.org/10.1088/1757-899x/1269/1/012011.

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Solar irradiance alterations due to the various atmospheric conditions have received great scientific concern. These alternations can be investigated by both monochromatic extinction coefficient and atmospheric transparency. In this work, continuous measurements of solar spectral irradiation using the Spectroradiometer for six selective wavelengths (350, 368, 500, 615, 780, and 870 nm) are carried out at the Helwan station, (NRIAG) in Egypt. Twelve clear-sky days of continuous observations have been monitored under different atmospheric conditions. The results have shown that using Langley met

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2

LI, Chunchun, Jingyao GAO, Xiaoqin WANG, Gongwu WANG, and Jun CAO. "Effects of Different Extinction for Morphine-CPP on Hippocampal EEG Power Spectrum in Mice." Wuhan University Journal of Natural Sciences 27, no. 3 (2022): 265–72. http://dx.doi.org/10.1051/wujns/2022273265.

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The relationship between hippocampal electroencephalogram (EEG) power spectrum and the extinction of addiction memory was investigated. Forty KM mice (Kunming mice) that had successfully established morphine (MOR)-conditioned place preference (CPP) were divided into four groups: saline-training extinction (SAL-TE), SAL-natural extinction (SAL-NE), MOR-TE, MOR-NE, for extinction treatment and EEG recording in the dorsal and ventral hippocampus (DH/VH). Results show that the CPP score of MOR-TE significantly decreased and the total, β and γ bands power spectrum of MOR-TE was suppressed. Notably,

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3

Melott, Adrian L., and Richard K. Bambach. "Analysis of periodicity of extinction using the 2012 geological timescale." Paleobiology 40, no. 2 (2014): 177–96. http://dx.doi.org/10.1666/13047.

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Analysis of two independent data sets with increased taxonomic resolution (genera rather than families) using the revised 2012 timescale reveals that an extinction periodicity first detected by Raup and Sepkoski (1984) for only the post-Paleozoic actually runs through the entire Phanerozoic. Although there is not a local peak of extinction every 27 Myr, an excess of the fraction of genus extinction by interval follows a 27-Myr timing interval and differs from a random distribution at the p ∼ 0.02 level. A 27-Myr periodicity in the spectrum of interval lengths no longer appears, removing the qu

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4

Newman, M. E. J., and Gunther J. Eble. "Decline in extinction rates and scale invariance in the fossil record." Paleobiology 25, no. 4 (1999): 434–39. http://dx.doi.org/10.1017/s0094837300020303.

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We show that the decline in the extinction rate during the Phanerozoic can be accurately described by a logarithmic fit to the cumulative total extinction. This implies that extinction intensity is falling off approximately as the reciprocal of time. We demonstrate that this observation alone is sufficient to explain the existence of the proposed power-law forms in the distribution of the sizes of extinction events and in the power spectrum of Phanerozoic extinction, results that previously have been explained by appealing to self-organized critical theories of evolutionary dynamics.

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5

Shao 邵, Zhenzhen 珍珍, and Biwei 碧沩 Jiang 姜. "Silicate Extinction Profile Based on the Stellar Spectrum by Spitzer/IRS." Astrophysical Journal 963, no. 2 (2024): 120. http://dx.doi.org/10.3847/1538-4357/ad1dd8.

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Abstract The 9.7 and 18 μm interstellar spectral features, arising from the Si–O stretching and O–Si–O bending modes of amorphous silicate dust, are the strongest extinction features in the infrared. Here we use the “pair method” to determine the silicate extinction profile by comparing the Spitzer/IRS spectra of 49 target stars with obvious extinction with those of unreddened stars of the same spectral type. The 9.7 μm extinction profile is determined from all the 49 stars and the 18 μm profile is determined from six stars. It is found that the profile has a peak wavelength at ∼9.2–9.8 and ∼1

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6

Nordtug, Trond, and Thor Bernt Melø. "Investigation of the Screening Pigment System in the Compound Eye of the Moth Agrotis segetum (fam. Noctuidae) by Visible Reflectometry." Zeitschrift für Naturforschung C 42, no. 1-2 (1987): 152–56. http://dx.doi.org/10.1515/znc-1987-1-225.

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Abstract The functional properties of the light adaptation system in the superposition eye of the moth Agrotis segetum have been investigated by reflection spectroscopy. The spectrum of the reflected light from the tapetum of dark adapted eyes had a peak at about 580 nm corresponding to a spacing between the reflecting layers in the tapetum of 145 nm. During light adaptation of the eye the observed reflectance changes could be explained by light extinction in one screening pigment. The shape of the extinction spectrum of the screening was constant throughout the adaptation process and after a

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7

Lutz, D. "3.2. ISO spectroscopy of the Galactic center and starburst nuclei." Symposium - International Astronomical Union 184 (1998): 91–92. http://dx.doi.org/10.1017/s0074180900084151.

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Since its launch in November 1995, the Infrared Space Observatory ISO has converted mid-infrared spectroscopy into a mature tool. Due to its proximity, brightness, and the wealth of complementary information, the center of our Galaxy remains a unique testbed for studies of galactic nuclei. A first analysis of the 2.4-45μm spectrum obtained with ISO-SWS (Fig. 1) has been presented by Lutz et al. (1996a). One of the surprises is a determination of the mid-infrared extinction law from comparison of the Galactic center hydrogen recombination line fluxes and case B expectations: The extinction law

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8

Zheng, Yuxia, Paerhatijiang Tuersun, Remilai Abulaiti, Dengpan Ma, and Long Cheng. "Retrieval of Size Distribution and Concentration of Au-Ag Alloy Nanospheroids by Spectral Extinction Method." Materials 15, no. 5 (2022): 1778. http://dx.doi.org/10.3390/ma15051778.

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In order to monitor the synthesis processes or characterize nanoparticles for application, a new method that allows in situ determination of the two-dimensional size distribution and concentration of Au-Ag alloy nanospheroids, based on their extinction spectrum, is developed. Non-negative Tikhonov regularization and T-matrix method were used to solve the inverse problem. The effects of the two-dimensional size steps, wavelength range, and measurement errors of extinction spectrum on the retrieval results were analyzed to verify the feasibility and accuracy of the retrieval algorithm. Through c

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9

Ma Wenying, 马文英, 杨欢 Yang Huan, 刘娟意 Liu Juanyi, 倪祖高 Ni Zugao, 唐东升 Tang Dongsheng, and 姚军 Yao Jun. "Influences of Shape on Extinction Spectrum for Metal Nanoparticles." Acta Optica Sinica 30, no. 9 (2010): 2629–33. http://dx.doi.org/10.3788/aos20103009.2629.

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10

Yang, Chun-Liang. "Optical extinction ratio monitoring techniques using optical spectrum analysis." Microwave and Optical Technology Letters 51, no. 8 (2009): 1800–1803. http://dx.doi.org/10.1002/mop.24512.

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11

Hashemizadeh, Sakineh, and Majid Rashidi Huyeh. "Silver Nanocolloid: Synthesis, Optical and Thermo-Optical Properties." Advanced Materials Research 829 (November 2013): 670–74. http://dx.doi.org/10.4028/www.scientific.net/amr.829.670.

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Linked to Surface Plasmon Resonance (SPR) phenomena, optical and thermo-optical properties of metal-dielectric nanocomposite materials including noble metal nanoparticles dispersed in a dielectric host medium are worthily interested. Indeed these materials have been proposed for many applications such as photonics devices, bio sensors and even photo-thermal therapy. Colloidal silver nanoparticles were synthesized by reduction of silver nitrate using of ascorbic acid and citrate as stabilizer agent in a 30°C water bath. The transmission electron microscopy (TEM) micrograph image shows formation

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12

Sun, Xiaogang, Hong Tang, and Gunbin Yuan. "Determination of the particle size range in the visible spectrum from spectral extinction measurements." Measurement Science and Technology 18, no. 11 (2007): 3572–82. http://dx.doi.org/10.1088/0957-0233/18/11/042.

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13

Gueymard, C., and H. D. Kambezidis. "Illuminance turbidity parameters and atmospheric extinction in the visible spectrum." Quarterly Journal of the Royal Meteorological Society 123, no. 539 (1997): 679–97. http://dx.doi.org/10.1002/qj.49712353908.

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14

Doazan, V., A. De La Fuente, M. Barylak, and N. Cramer. "Absolute Magnitude Determination of Be Stars: The Inadequacy of the 2200 Å Bump." International Astronomical Union Colloquium 137 (1993): 787–88. http://dx.doi.org/10.1017/s025292110001887x.

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AbstractWe present fax UV observations of Pleione made with the IUE satellite at two epochs: in 1979, when the star exhibited a strong shell spectrum and, in 1991, when it showed a Be-type spectrum. Between these two epochs, the 2200 Å bump changed dramatically, thus, rendering it inadequate for interstellar extinction/distance determination.

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15

Maji, K., K. Mukherjee, and A. Raja. "Frequency Encoded All Optical Tri-state Logic Gates NOT and NAND Using Semiconductor Optical Amplifier Based Interferometric Switches." Nanoscience & Nanotechnology-Asia 10, no. 4 (2020): 369–80. http://dx.doi.org/10.2174/2210681209666190620110027.

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All optical tri-state frequency encoded logic gates NOT and NAND are proposed and numerically investigated using TOAD based interferometric switch for the first time to the best of our knowledge. The optical power spectrum, extinction ratio, contrast ration, and amplified spontaneous noise are calculated to analyze and confirm practical feasibility of the gates. The proposed device works for low switching energy and has high contrast and extinction ratio as indicated in this work.

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Sun, Chang Long, Zhen Ping Wu, Shi Jie Lu, et al. "Determination of the Optical Constants of Gallium Oxide Films." Advanced Materials Research 986-987 (July 2014): 42–46. http://dx.doi.org/10.4028/www.scientific.net/amr.986-987.42.

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Transmission spectrum and reflectance spectrum have long been used to characterize gap semiconductor. Transmission spectrum can be measured very directly, but the influence of substrate absorption is often unavoidable. However, when using the reflectance spectrum measurement, the absorption of thin film, substrate absorption, and coherent interference will make the reflectance spectrum much more complicated. In this paper, Considering the absorption of thin film, substrate absorption, and coherent interference, we use the envelope curves algorithm to achieve the calculation formula of refracti

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17

Pan, Hong Liang, Teng Li, Shi Liang Yang, and Yi Ming Liu. "Electronic Structure and Optical Properties of SrTi_0.5Zr_0.5O₃." Advanced Materials Research 846-847 (November 2013): 1919–22. http://dx.doi.org/10.4028/www.scientific.net/amr.846-847.1919.

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The electronic-energy band structure and optical properties of SrTi0.5Zr0.5O3are calculated by the pseudo-potential plane wave (PP-PW) mehod with the generalized gradient approximation (GGA). The energy band structure, density of states (DOS) are obtained. The optical properties including the dielectric function, reflectivity, absorption spectrum, extinction coefficient, energy-loss spectrum and refractive index are also discussed.

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18

Yang, Shi Liang, Hong Liang Pan, Teng Li, and Yi Ming Liu. "Electronic Structure and Optical Properties of BaTi_0.75Nd_0.25O₃." Advanced Materials Research 846-847 (November 2013): 1923–26. http://dx.doi.org/10.4028/www.scientific.net/amr.846-847.1923.

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The electronic-energy band structure and optical properties of BaTi0.75Nd0.25O3are calculated by the pseudo-potential plane wave (PP-PW) mehod with the generalized gradient approximation (GGA). The energy band structure, density of states (DOS) are obtained. The optical properties including the dielectric function, reflectivity, absorption spectrum, extinction coefficient, energy-loss spectrum and refractive index are also discussed.

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19

Kong, Congying, and Hao Liu. "Numerical simulation of wave spectrum during a typhoon." E3S Web of Conferences 290 (2021): 02019. http://dx.doi.org/10.1051/e3sconf/202129002019.

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The third-generation wave model WAVEWATCH-III was used to numerically simulate the wave under the influence of a typhoon in the coastal area of China. The wave spectrum at the buoy point was output, and the characteristics of the wave spectrum were analyzed. The change of the wave spectrum during the typhoon process reflected the growth process of typhoon formation, development and extinction. The relationship between the wave spectrum and the wind direction was intuitively shown by the directional spectrum, indicating the coexistence of wind waves and swells in the sea area during the typhoon

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20

Li, Jun, and Nicholas A. Kotov. "Circular extinction of plasmonic silver nanocaps and gas sensing." Faraday Discussions 186 (2016): 345–52. http://dx.doi.org/10.1039/c5fd00138b.

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Chiral plasmonic nanostructures exhibit strong rotatory optical activity and are expected to enrich the field of metaoptical materials. Potential applications of chiroplasmonic nanostructures include circular polarizers, optical polarization detectors, asymmetric catalysts, and sensors. However, chiral plasmonic materials require subwavelength structural control and involve laborious chemical or lithographic procedures for their manufacturing. Moreover, strong rotatory activity of subwavelength structures whose chirality was imparted by microfabrication, has been obtained for the red and infra

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21

Чекулаев, М. С., та С. Г. Ястребов. "Оптическое поглощение гибридных молекулярных кластеров С-=SUB=-32-=/SUB=-Н-=SUB=-24-=/SUB=-, С-=SUB=-32-=/SUB=-Н-=SUB=-36-=/SUB=- на основе фрагментов даймондена и графена". Письма в журнал технической физики 47, № 4 (2021): 19. http://dx.doi.org/10.21883/pjtf.2021.04.50639.18413.

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Using the density functional theory (DFT), the geometry optimised for molecular clusters C32H24 and C32H36, constructed with a hybrid of fragments of diamondene and graphene with the dangling bonds passivated with hydrogen. The time-dependent DFT allowed calculating molar extinction spectra of the clusters. The comparison of the calculated spectra with the results of astrophysical observations evidence on a possible contribution of the clusters to the extinction spectrum of light by the carbon-based constituent of the interstellar medium.

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22

Pan, Hong Liang, Shi Liang Yang, and Teng Li. "First-Principles Study of Structural, Electronic and Optical Properties in BaTi_0.5Ni_0.5O₃." Advanced Materials Research 834-836 (October 2013): 268–71. http://dx.doi.org/10.4028/www.scientific.net/amr.834-836.268.

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The pseudo-potential plane wave (PP-PW) mehod with the generalized gradient approximation (GGA) is applied to study the electronic and optical properties of BaTi0.5Ni0.5O3. The energy band structure, density of states (DOS) are obtained. The optical properties including the dielectric function, reflectivity, absorption spectrum, extinction coefficient, energy-loss spectrum and refractive index are also calculated and analyzed in detail.

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23

Eyles, R. A. J., P. T. O’Brien, K. Wiersema, et al. "An unusual transient following the short GRB 071227." Monthly Notices of the Royal Astronomical Society 489, no. 1 (2019): 13–27. http://dx.doi.org/10.1093/mnras/stz2040.

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ABSTRACT We present X-ray and optical observations of the short duration gamma-ray burst GRB 071227 and its host at z = 0.381, obtained using Swift, Gemini South, and the Very Large Telescope. We identify a short-lived and moderately bright optical transient, with flux significantly in excess of that expected from a simple extrapolation of the X-ray spectrum at 0.2–0.3 d after burst. We fit the SED with afterglow models allowing for high extinction and thermal emission models that approximate a kilonova to assess the excess’ origins. While some kilonova contribution is plausible, it is not fav

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Himstedt, Rasmus, Dominik Hinrichs, and Dirk Dorfs. "Extinction Coefficient of Plasmonic Nickel Sulfide Nanocrystals and Gold-Nickel Sulfide Core-Shell Nanoparticles." Zeitschrift für Physikalische Chemie 233, no. 1 (2018): 3–14. http://dx.doi.org/10.1515/zpch-2018-1165.

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Abstract In the presented work, the molar extinction coefficient of plasmonic heazlewoodite (Ni3S2) nanoparticles and Au-Ni3S2 core-shell nanoparticles is determined for the first time. The results are compared to analogously determined extinction coefficients of pure Au nanocrystals (NCs), which themselves correlate very well with existing literature on the subject. The measured extinction coefficients at the localized surface plasmon resonance (LSPR) maximum wavelength of nickel sulfide particles are similar to the values of equally sized Au NCs. Therefore, considering the lower cost of the

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Kotlikov, E. N., N. P. Lavrovskaya, I. K. Miloushev, and T. K. Tenev. "Investigation of optical constants of Al₂O₃ films in the spectral range 0.2 - 0.8 microns." Journal of Physics: Conference Series 2436, no. 1 (2023): 012005. http://dx.doi.org/10.1088/1742-6596/2436/1/012005.

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Abstract We determine optical constants of Al2O3 films deposited by electron beam evaporation on a quartz substrate in the spectrum range 0.2-0.8 microns. Refractive index and extinction coefficient are determined by a spectrophotometric method using the reflection and transmission spectra. An original method of correction of the spectra of the films is used taking into account the absorption. The refractive index is determined from absorption-free spectra, and the extinction coefficient is determined from absorption spectra in the specified spectral region.

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Plotnick, Roy E., and J. John Sepkoski. "A multiplicative multifractal model for originations and extinctions." Paleobiology 27, no. 1 (2001): 126–39. http://dx.doi.org/10.1666/0094-8373(2001)027<0126:ammmfo>2.0.co;2.

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Recent works have suggested that the fossil record exhibits a fractal structure; i.e., that processes, such as extinction, follow a power-law size distribution and their time series show a 1/f power spectrum. This structure has been used as evidence that evolutionary dynamics are an example of a self-organized critical (SOC) process. We have reexamined this claim by analyzing a detailed record of marine genus-level extinctions and originations. Our results indicate that neither extinctions nor origination metrics show the power-law size distribution or a 1/f power spectrum characteristic of SO

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27

Groves, Brent, Michael A. Dopita, Robert E. Williams, and Chon-Trung Hua. "The Internal Extinction Curve of NGC 6302 and its Extraordinary Spectrum." Publications of the Astronomical Society of Australia 19, no. 4 (2002): 425–42. http://dx.doi.org/10.1071/as02010.

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AbstractIn this paper we present a new method for obtaining the optical wavelength-dependent reddening function of planetary nebulae (PN), using the nebular and stellar continuum. The data used was a spectrum of NGC 6302 obtained using the Double Beam Spectrograph on the 2.3 m telescope at Siding Springs Observatory over three nights. This resulted in a spectrum covering a wavelength range 3300–8600 Å with a large dynamical range and a mean signal to noise of >102 Å−1 in the nebular continuum. With such a high S/N the continuum can be accurately compared with a theoretical model of nebular

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N. Ostroukhov, Nikolay. "Metals Hydrosols Universal Extinction Spectrum of 0.2 Micrometer Wavelength Ultrafine Component." Nanoscience and Nanometrology 3, no. 1 (2017): 1. http://dx.doi.org/10.11648/j.nsnm.20170301.11.

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Dimri, V. P., and M. Ravi Prakash. "Scaling of power spectrum of extinction events in the fossil record." Earth and Planetary Science Letters 186, no. 3-4 (2001): 363–70. http://dx.doi.org/10.1016/s0012-821x(01)00246-1.

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Zhang, Yunqing, Yang Zhang, Xiang’e Han, Paerhatijiang Tuersun, and Kuan Fang Ren. "Influence of Refractive Index in Particle Sizing by Light Extinction Spectrum." Procedia Engineering 102 (2015): 315–21. http://dx.doi.org/10.1016/j.proeng.2015.01.148.

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Wang, Yuxi, Jian Gao, and Yi Ren. "Dust Extinction Law in Nearby Star-resolved Galaxies. I. M31 Traced by Supergiants." Astrophysical Journal Supplement Series 259, no. 1 (2022): 12. http://dx.doi.org/10.3847/1538-4365/ac3bc6.

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Abstract The dust extinction laws and dust properties in M31 are explored with a sample of reddened O-type and B-type supergiants obtained from the Local Group Galaxies Survey (LGGS). The observed spectral energy distributions (SEDs) for each tracer are constructed with multiband photometry from the LGGS, PS1 Survey, UKIRT, PHAT Survey, Swift/UVOT, and XMM-SUSS. We model the SED for each tracer in combination with the intrinsic spectrum obtained from the stellar model atmosphere extinguished by the model extinction curves. Instead of mathematically parameterizing the extinction functions, the

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Luo, Yi, Yadong Zhou, Shengli Zou, and Jing Zhao. "Dielectric domain distribution on Au nanoparticles revealed by localized surface plasmon resonance." Journal of Materials Chemistry C 6, no. 44 (2018): 12038–44. http://dx.doi.org/10.1039/c8tc02944j.

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The LSPR of Au nanospheres shows almost no shift in the extinction spectrum with attachment of a silica domain but considerable shift with a uniform layer of silica, indicating LSPR can be used to differentiate the segregated/uniform dielectric distribution.

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Nurick, A. "Clear sky solar illuminance using visual band irradiance." Journal of Energy in Southern Africa 25, no. 3 (2014): 11–19. http://dx.doi.org/10.17159/2413-3051/2014/v25i3a2653.

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Solar illuminance may be quantified by applying relevant efficacy functions to available full spectrum ground irradiance. Alternatively, illuminance may be determined by applying the Photopic function to ground level irradiance spectra obtained from the terrestrial irradiance spectrum adjusted using relevant atmospheric absorption and scattering coefficients. The Photopic function has finite values in the wavelength range of 400 nm to 700 nm and is concentrated around a mean wavelength of 555 nm with irradiance at wavelengths close to 555 nm contributing to the major portion of illuminance. Ca

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Sami Abdali, Mohammed, Ahmed Shaker Hussein, and Mohammed Hadi Shinen. "Study the Effect of Thickness on Optical Properties of Titanium Dioxide (TiO2) That Preparation of Via the Sol-Gel Process." Journal of Kufa-Physics 12, no. 01 (2020): 73–78. http://dx.doi.org/10.31257/2018/jkp/2020/120111.

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This research, study the effect of the thickness on titanium dioxide (TiO2) , that prepared by the Sol-Gel Process method on the optical properties of (TiO2) thin film with different thickness (54, 64 and 89 nm), the thickness effect on optical properties (energy gap , absorbance spectrum, transmittance spectrum, reflectance, refractive index, extinction coefficient, absorption coefficient, real and imaginary dielectric constant) ,this study shows that thickness have an effect on all these parameters .

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Albutt, Naphat, and Suejit Pechprasarn. "Predicting the UV Spectrum of Oligodeoxynucleotide by 2D-Matlab." Applied Mechanics and Materials 866 (June 2017): 37–40. http://dx.doi.org/10.4028/www.scientific.net/amm.866.37.

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A 2D-Matlab model was developed to predict the UV absorbance spectra and thus concentration of oligodeoxynucleotide samples. This model will be valuable for researchers designing experiments involving oligodeoxynucleotides. Initial data was acquired from UV absorbance spectra of oligodeoxynucleotides 23, 24 and 34 bases long. The model, which would predict the concentration of DNA from the R260 value, is shown to predict absorbance spectra and the extinction coefficient of DNA as shown when compared across a range of concentrations.

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Mendoza Herrera, Luis J., Ignacio J. Bruvera, Lucía B. Scaffardi, and Daniel C. Schinca. "Sizing and Eddy currents in magnetic core nanoparticles: an optical extinction approach." Physical Chemistry Chemical Physics 19, no. 4 (2017): 3076–83. http://dx.doi.org/10.1039/c6cp08260b.

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We extend the typical analysis of the extinction spectrum of magnetic core NPs by solving Mie theory with a frequency dependent susceptibility and considering the effect of Eddy currents in order to obtain the size distribution of the cores and the coating layers.

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Due, Yongki Pawe, Minsyahril Bukit, and Albert Zicko Johannes. "KAJIAN AWAL SPEKTRUM SERAPAN UV−Vis SENYAWA HASIL EKSTRAK DAUN JERUK NIPIS (Citrus aurantifolia) ASAL TARUS KABUPATEN KUPANG." Jurnal Fisika : Fisika Sains dan Aplikasinya 4, no. 1 (2019): 40–47. http://dx.doi.org/10.35508/fisa.v4i1.1437.

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Abstrak Penelitian tentang kajian awal spektrum serapan UV−Vis senyawa hasil ekstrak daun jeruk nipis (Citrus aurantifolia) asal Tarus Kabupaten Kupang telah dilakukan. Tujuan penelitian ini adalah untuk menentukan nilai jangkauan serapan, koefisisen serapan, celah energi dan koefisien ekstingsi spesifiknya. Daun jeruk nipis kering dihaluskan sampai menjadi serbuk, diekstraksi secara maserasi,dievaporasi menggunakan evaporator, kemudian diencerkan dengan menggunakan pelarut etanol. Selanjutnya hasil tersebut dikarakterisasi menggunakan Spektrometer UV-Vis untuk mendapatkan spektrum serap

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Wang, Peng, Hongxia Liu, Yizheng Zhao, et al. "Electromagnetic Attenuation Characteristics of Microbial Materials in the Infrared Band." Applied Spectroscopy 70, no. 9 (2016): 1456–63. http://dx.doi.org/10.1177/0003702816662599.

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In this study, seven microbial materials (entomogenous fungi Bb3088 mycelia, entomogenous fungi Bb3088 spores, entomogenous fungi Ma2677 mycelia, entomogenous fungi Ma2677 spores, Bacillus subtilis 8204, Staphylococcus aureus 6725, and Saccharomyces cerevisiae 1025) were used to measure electromagnetic (EM) signal extinction. They were subjected to light absorption and reflection measurements in the range of 4000–400 cm−1 (2.5–25 µm) using Fourier transform infrared spectroscopy. The specular reflection spectrum method was used to calculate the real ( n) and imaginary ( k) parts of the complex

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Zhang, Ying, Hao Wang, Heshen Li, Junhua Sun, Huilan Liu, and Yingshuo Yin. "Optimization Model of Signal-to-Noise Ratio for a Typical Polarization Multispectral Imaging Remote Sensor." Sensors 22, no. 17 (2022): 6624. http://dx.doi.org/10.3390/s22176624.

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The signal-to-noise ratio (SNR) is an important performance evaluation index of polarization spectral imaging remote sensors. The SNR-estimation method based on the existing remote sensor is not perfect. To improve the SNR of this model, a partial detector check slant direction is presented in this study, and a polarization extinction ratio related to the internal SNR model of a typical multispectral imaging remote sensor is combined with the vector radiative transfer model to construct the atmosphere 6SV–SNR coupling model. The new result is that the central wavelength of the detection spectr

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Sitko, Michael L., Ray W. Russell, Korash Assani, et al. "Gas Dynamics in 3 “Dippers”: EPIC 203850058, EPIC 204638512, and EPIC 205151387 in 2017–2018." Research Notes of the AAS 8, no. 12 (2024): 310. https://doi.org/10.3847/2515-5172/ad9f33.

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Abstract We have examined variability of the three dipper stars—EPIC 203850058, EPIC 204638512, and EPIC 205151387—using the SpeX spectrograph on NASA’s Infrared Telescope facility on two nights in 2018. We combined these data with those previously published from 2017. In EPIC 204638512, the He i line was in absorption, but blueshifted in wavelength on all 4 nights, indicating outflowing gas near the disk surface. In EPIC 203850058, no net emission is seen in 2018, but in 2017 it had an absorption core that was degraded to longer wavelengths, suggesting inflowing gas. In EPIC 205151387 the He

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Sokolov, Konstantin, Peter Khodorchenko, Andrey Petukhov, Igor Nabiev, George Chumanov, and Therese M. Cotton. "Contributions of Short-Range and Classical Electromagnetic Mechanisms to Surface-Enhanced Raman Scattering from Several Types of Biomolecules Adsorbed on Cold-Deposited Island Films." Applied Spectroscopy 47, no. 4 (1993): 515–22. http://dx.doi.org/10.1366/0003702934335056.

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Surface-enhanced Raman scattering (SERS) spectra of three different classes of adsorbates have been analyzed: (1) native and denatured calf thymus DNA and adenine, as examples of molecules with electronic transitions in the UV region only; (2) flavine adenine dinucleotide (FAD) and doxorubicin (DOX), as examples of chromophores with low extinction transitions in the visible region; and (3) β-carotene, as an example of a chromophore with a very high extinction coefficient for an electronic transition in the visible region. These molecules were adsorbed on silver island films that had an extinct

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Marcano Olaizola, Aristides. "Photothermal Determination of Absorption and Scattering Spectra of Silver Nanoparticles." Applied Spectroscopy 72, no. 2 (2017): 234–40. http://dx.doi.org/10.1177/0003702817738056.

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This work reports on photothermal lens spectra of silver nanoparticles of different dimensions in the spectral region of 370–730 nm performed using an arc-lamp-based photothermal spectrophotometer. We show that the photothermal and extinction cross-section spectra of the samples are similar for nanoparticles of reduced dimensions where scattering effects are small. The results differ substantially for nanoparticles of a diameter larger than 30 nm for which scattering becomes relevant. We demonstrate that the photothermal spectrum corresponds to the absorption component of the particle’s extinc

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Trigari, Silvana, Alessio Rindi, Giancarlo Margheri, Stefano Sottini, Giovanna Dellepiane, and Emilia Giorgetti. "Synthesis and modelling of gold nanostars with tunable morphology and extinction spectrum." Journal of Materials Chemistry 21, no. 18 (2011): 6531. http://dx.doi.org/10.1039/c0jm04519e.

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Liu, Jing, Haoyuan Cai, Kai Tang, and Lingqi Kong. "Plasmonic Filters Based on Lithographically Patterned and Hexagonally Arranged Triangular Silver Nanoparticles Array." Advances in Materials Science and Engineering 2015 (2015): 1–9. http://dx.doi.org/10.1155/2015/195320.

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A plasmonic filter applied in visible regime is proposed on the basis of hexagonally arranged triangular silver nanoparticle arrays. A method using discrete dipole approximation (DDA) to aid design parameters of the silver nanoparticle arrays is adopted for the filter design and optimization on the basis of computational numerical calculation. The influence of the particle’s thickness and period on the extinction spectrum is studied using the DDA-based computational analysis. Considering the nanofabrication condition, arrays with 40 nm thickness and 230 nm period are selected and fabricated by

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Huang, Hung Ji, Ming-Hua Shiao, Yang-Wei Lin, et al. "Au@Ag Dendritic Nanoforests for Surface-Enhanced Raman Scattering Sensing." Nanomaterials 11, no. 7 (2021): 1736. http://dx.doi.org/10.3390/nano11071736.

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The effects of Au cores in Ag shells in enhancing surface-enhanced Raman scattering (SERS) were evaluated with samples of various Au/Ag ratios. High-density Ag shell/Au core dendritic nanoforests (Au@Ag-DNFs) on silicon (Au@Ag-DNFs/Si) were synthesized using the fluoride-assisted Galvanic replacement reaction method. The synthesized Au@Ag-DNFs/Si samples were characterized using scanning electron microscopy, energy-dispersive X-ray spectroscopy, reflection spectroscopy, X-ray diffraction, and Raman spectroscopy. The ultraviolet-visible extinction spectrum exhibited increased extinction induced

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Krełowski, Jacek. "Diffuse Interstellar Bands – The Unidentified Part of the Interstellar Absorption Spectrum." Symposium - International Astronomical Union 135 (1989): 67–86. http://dx.doi.org/10.1017/s0074180900125112.

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The unidentified (since 1921) diffuse interstellar bands (DIBs) are discussed together with their relations to other interstellar absorptions sucn as: continuous extinction, polarization and atomic or molecular absorption lines. It is shown that DIBs do not form the absorption spectrum of one agent, but probably of several (3 or more). DIBs as well as other interstellar absorptions are usually formed in several clouds along a line-of-sight. Thus, they suffer Doppler splitting; the first high resolution profiles free of the latter effect are described. Since single interstellar clouds may diffe

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HARUN, S. W., K. S. LIM, and H. AHMAD. "MICROFIBER STRUCTURES FOR SENSOR APPLICATIONS." Journal of Nonlinear Optical Physics & Materials 21, no. 01 (2012): 1250003. http://dx.doi.org/10.1142/s0218863512500038.

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Microfiber loop resonator (MLR) and microfiber knot resonator (MKR) are fabricated using melt-stretching method for applications in temperature and current sensor, respectively. The MLR is embedded into low refractive index polymer for robustness. Although the spacing of the transmission comb spectrum of the MLR is unchanged with temperature, the extinction ratio of the spectrum is observed to decrease linearly with temperature due to induced changes in the material's refractive index. The slope of the extinction ratio reduction against temperature is about 0.043dB/°C. With the assistance of a

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Chen, Anyue, Junping Li, Yiqing Chen, and Dingxuan Zhou. "Asymptotic Behaviour of Extinction Probability of Interacting Branching Collision Processes." Journal of Applied Probability 51, no. 1 (2014): 219–34. http://dx.doi.org/10.1239/jap/1395771425.

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Although the exact expressions for the extinction probabilities of the Interacting Branching Collision Processes (IBCP) were very recently given by Chen et al. [4], some of these expressions are very complicated; hence, useful information regarding asymptotic behaviour, for example, is harder to obtain. Also, these exact expressions take very different forms for different cases and thus seem lacking in homogeneity. In this paper, we show that the asymptotic behaviour of these extremely complicated and tangled expressions for extinction probabilities of IBCP follows an elegant and homogenous po

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Chen, Anyue, Junping Li, Yiqing Chen, and Dingxuan Zhou. "Asymptotic Behaviour of Extinction Probability of Interacting Branching Collision Processes." Journal of Applied Probability 51, no. 01 (2014): 219–34. http://dx.doi.org/10.1017/s0021900200010196.

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Although the exact expressions for the extinction probabilities of the Interacting Branching Collision Processes (IBCP) were very recently given by Chen et al. [4], some of these expressions are very complicated; hence, useful information regarding asymptotic behaviour, for example, is harder to obtain. Also, these exact expressions take very different forms for different cases and thus seem lacking in homogeneity. In this paper, we show that the asymptotic behaviour of these extremely complicated and tangled expressions for extinction probabilities of IBCP follows an elegant and homogenous po

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Yuan, Anqi, Chenwei Yang, Guohu Zhong, Lin Xiao, Xiang Pan, and Hongyan Zhou. "Discovery of a luminous starburst galaxy with hundreds of thousands of Wolf–Rayet stars." Monthly Notices of the Royal Astronomical Society 510, no. 1 (2021): 309–19. http://dx.doi.org/10.1093/mnras/stab3409.

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ABSTRACT This paper reports the detection of a strong Wolf–Rayet (W-R) emission bump feature at 4400–4700 Å in the optical spectrum of a distant galaxy SDSS J150009.81+452844.4 at a redshift of 0.453. The estimated number of W-R stars is 1.5 × 105 without applying any internal extinction correction, and at least 4.5 × 105 after correcting for dust extinction. Such a number, though with uncertainties inherent from the extinction correction and others, appears to outnumber those in previous W-R galaxies after correcting for intrinsic dust extinction with the numbers available in the literature.

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