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Статті в журналах з теми "Mass absorption coefficients"

Автор: Grafiati

Опубліковано: 19 жовтня 2024

Оновлено: 31 липня 2025

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1

Buse, Ben, та Stuart Kearns. "Quantification of Olivine Using Fe Lα in Electron Probe Microanalysis (EPMA)". Microscopy and Microanalysis 24, № 1 (2018): 1–7. http://dx.doi.org/10.1017/s1431927618000041.

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AbstractQuantification of first series transition metal Lα X-rays is hampered by absorption and in some cases transition probabilities (fluorescence yields) varying with chemical bonding. Compound mass absorption coefficients for Fe Lα were measured in the olivine solid solution series [Forsterite (Mg2SiO4) to Fayalite (Fe2SiO4)] and the mass absorption coefficients for Fe Lα absorbed by Fe were calculated. The mass absorption coefficients vary systematically between Fo83 and Fo0. Using the measured mass absorption coefficients for both standard and unknown and by correcting for a systematic d

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2

Bairlein, Katharina, and Oliver Hupe. "INFLUENCE OF NEW MASS ENERGY-ABSORPTION COEFFICIENTS FROM ICRU REPORT NO. 90 ON AIR KERMA TO DOSE EQUIVALENT CONVERSION COEFFICIENTS." Radiation Protection Dosimetry 185, no. 1 (2018): 27–33. http://dx.doi.org/10.1093/rpd/ncy213.

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Abstract In Report No. 90 of the International Commission on Radiation Units and Measurements (ICRU), new mass energy-absorption coefficients are listed which are based on renormalized Scofield photoeffect cross-sections. The mass energy-absorption coefficients are the basis for the conversion coefficients from air kerma to the operational quantities listed in ISO 4037-3. Although ICRU does not give a recommendation if these new mass energy-absorption coefficients should be applied instead of the values used so far, an examination of the possible consequences for radiation protection quantitie

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3

Hitzenberger, Regina. "Absorption and mass absorption coefficients measured with the integrating plate method." Journal of Aerosol Science 20, no. 8 (1989): 1205–8. http://dx.doi.org/10.1016/0021-8502(89)90798-2.

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4

Rickerby, David G., and Norbert Wächter. "Effective L-Series Mass Absorption Coefficients for EDS." Microchimica Acta 132, no. 2-4 (2000): 157–61. http://dx.doi.org/10.1007/s006040050057.

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5

Seltzer, Stephen M. "Calculation of Photon Mass Energy-Transfer and Mass Energy-Absorption Coefficients." Radiation Research 136, no. 2 (1993): 147. http://dx.doi.org/10.2307/3578607.

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6

Ibrahim, Mohamed Mahmoud Aboelkheir. "Trends in an Absorption Column through Mass Transfer Coefficients." Cognizance Journal of Multidisciplinary Studies 2, no. 1 (2022): 38–57. https://doi.org/10.47760/cognizance.2022.v02i01.003.

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A study was conducted to measure the values of m.t.c and N of an absorption column. Values of N were in the range of 10-5, while those of m.t.c were in the range of 10-7. The trends with variables were confirmed with the previous studies. However, they were not with m.t.c. Pressure variance was suggested as the reason. Error was assessed at a percentage of 15% for m.t.c, and under 2% for pressure. Using other methods than only measuring concentration of solute with the Hempl apparatus was recommended.

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7

Chipera, Steve J., and David L. Bish. "Measurement of Mass Absorption Coefficients Using Compton-Scattered Cu Radiation in X-ray Diffraction Analysis." Advances in X-ray Analysis 34 (1990): 325–35. http://dx.doi.org/10.1154/s0376030800014634.

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AbstractThe mass absorption coefficient is a useful parameter for quantitative characterization of materials. If the chemical composition of a sample is known, the mass absorption coefficient can be calculated directly. However, the mass absorption coefficient must be determined empirically if the chemical composition is unknown. Traditional methods for determining the mass absorption coefficient involve measuring the transmission of monochromatic X-rays through a sample of known thickness and density. Reynolds (1963,1967), however, proposed a method for determining the mass absorption coeffic

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8

Mahmoud Aboelkheir, Ibrahim Mohamed. "Trends in an Absorption Column through Mass Transfer Coefficients." Cognizance Journal of Multidisciplinary Studies 2, no. 1 (2022): 38–57. http://dx.doi.org/10.47760/cognizance.2022.v02i01.003.

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A study was conducted to measure the values of m.t.c and N of an absorption column. Values of N were in the range of 10-5, while those of m.t.c were in the range of 10-7. The trends with variables were confirmed with the previous studies. However, they were not with m.t.c. Pressure variance was suggested as the reason. Error was assessed at a percentage of 15% for m.t.c, and under 2% for pressure. Using other methods than only measuring concentration of solute with the Hempl apparatus was recommended.

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9

Babikian, D. S., D. K. Edwards, S. E. Karam, C. P. Wood, and G. S. Samuelsen. "Experimental mass absorption coefficients of soot in spray combustorflames." Journal of Thermophysics and Heat Transfer 4, no. 1 (1990): 8–15. http://dx.doi.org/10.2514/3.29157.

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10

Alkire, R. W. "Approximating the near-edge mass absorption coefficients for Ni using an ultra-thin bimetal foil." Journal of Applied Crystallography 50, no. 1 (2017): 1–13. http://dx.doi.org/10.1107/s1600576716017544.

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In an effort to improve the characteristics of a fluorescing metal-foil-based beam position monitor, a new bimetal ultra-thin (0.98/0.67 µm) Ti–Ni foil was introduced to replace an existing single-element ultra-thin 0.5 µm thick Cr foil. During characterization it was determined that absorption measurements on the bimetal foil could be used to fit the Ni mass absorption coefficients accurately in the vicinity of the Ni K edge. Comparison with experimental results from the literature demonstrated that the fitting procedure produced coefficients with uncertainties of the order of ±1%. Once deter

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11

Defrianto, Defrianto, Muhammad Ahlunnazah, Saktioto Saktioto, and Nuraina Fika Lubis. "Acoustic Absorption Coefficient of Oil Palm Midrib Composite." Jurnal Fisika Flux: Jurnal Ilmiah Fisika FMIPA Universitas Lambung Mangkurat 22, no. 1 (2025): 84. https://doi.org/10.20527/flux.v22i1.20339.

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Composite from oil palm midrib waste is one of the natural fiber materials that can reduce noise. Its material sample composite with gypsum was placed inside an impedance tube, which fitted with the mass of palm midrib mill, i.e., 0.1 kg, 0.15 kg, and 0.2 kg. Next, sound absorption coefficients were measured based on the two farthest ranges of the sound-receiving microphone, i.e., range A, which was 45 cm from the sample, and range B, which was 55 cm from the sample. Sound source frequencies were used, i.e., 125 Hz, 250 Hz, 500 Hz, 1000 Hz, and 2000 Hz. This research found that the link betwee

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12

Willis, J. P. "Mass Absorption Coefficient Determination Using Compton Scattered Tube Radiation: Applications, Limitations and Pitfalls." Advances in X-ray Analysis 34 (1990): 243–61. http://dx.doi.org/10.1154/s0376030800014543.

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Trace element determination by X-ray fluorescence spectrometry is subject, like almost all instrumental analytical techniques, to systematic errors, also known as matrix effects. This paper deals with the determination of mass absorption coefficients (MACs), using Compton peak intensities, for the correction of matrix effects arising only from elemental absorption in the sample.When absorption effects are significant the relationship between net analyte peak intensity and concentration will no longer be constant, and corrections will be necessary for accurate analyses.

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13

Gabitto, Jorge, and Costas Tsouris. "Determination of reactive mass transfer coefficients for CO2 absorption predictions." Separation Science and Technology 54, no. 13 (2019): 2026–33. http://dx.doi.org/10.1080/01496395.2019.1603240.

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14

Cordey, J. "Quantitative computed tomography: From linear absorption coefficients to bone mass." Injury 23 (January 1992): S47—S53. http://dx.doi.org/10.1016/s0020-1383(10)80005-1.

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15

Fujita, Isamu, and Eiji Hihara. "Heat and mass transfer coefficients of falling-film absorption process." International Journal of Heat and Mass Transfer 48, no. 13 (2005): 2779–86. http://dx.doi.org/10.1016/j.ijheatmasstransfer.2004.11.028.

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16

Ristić, Goran S., Stefan D. Ilić, Sandra Veljković, et al. "Commercial P-Channel Power VDMOSFET as X-ray Dosimeter." Electronics 11, no. 6 (2022): 918. http://dx.doi.org/10.3390/electronics11060918.

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The possibility of using commercial p-channel power vertical double-diffused metal-oxide-semiconductor field-effect transistors (VDMOSFETs) as X-ray sensors is investigated in this case study. In this aspect, the dependence of sensitivity on both the gate voltage and the mean energy for three X-ray beams is examined. The eight gate voltages from 0 to 21 V are applied, and the dependence of the sensitivity on the gate voltage is well fitted using the proposed equation. Regarding X-ray energy, the sensitivity first increases and then decreases as a consequence of the behavior of the mass energy-

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17

Sobieszuk, Paweł, Filip Ilnicki, and Ryszard Pohorecki. "Contribution of Liquid- and Gas-Side Mass Transfer Coefficients to Overall Mass Transfer Coefficient in Taylor Flow in a Microreactor." Chemical and Process Engineering 35, no. 1 (2014): 35–45. http://dx.doi.org/10.2478/cpe-2014-0003.

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Abstract Gas-liquid microreactors find an increasing range of applications both in production, and for chemical analysis. The most often employed flow regime in these microreactors is Taylor flow. The rate of absorption of gases in liquids depends on gas-side and liquid-side resistances. There are several publications about liquid-side mass transfer coefficients in Taylor flow, but the data about gas-side mass transfer coefficients are practically non existent. We analysed the problem of gas-side mass transfer resistance in Taylor flow and determined conditions, in which it may influence the o

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18

Utry, N., T. Ajtai, M. Pintér, et al. "Mass-specific optical absorption coefficients and imaginary part of the complex refractive indices of mineral dust components measured by a multi-wavelength photoacoustic spectrometer." Atmospheric Measurement Techniques 8, no. 1 (2015): 401–10. http://dx.doi.org/10.5194/amt-8-401-2015.

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Abstract. Mass-specific optical absorption coefficients (MACs) and the imaginary part (κ) of the refractive indices of various mineral dust components including silicate clays (illite, kaolin and bentonite), oxides (quartz, hematite and rutile), and carbonate (limestone) were determined at the wavelengths of 1064, 532, 355 and 266 nm. The MAC values were calculated from aerosol optical absorption coefficients measured by a multi-wavelength photoacoustic (PA) instrument, the mass concentration and the number size distribution of the generated aerosol samples as well as the size transfer functio

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19

Hu, Meilin, Kangxian Guo, Zhongmin Zhang, Xiancong Jiang, Keyin Li, and Dongfeng Liu. "The effect of position-dependent mass on nonlinear optical absorption coefficients and refractive index changes in a quantum well." International Journal of Modern Physics B 31, no. 03 (2017): 1750009. http://dx.doi.org/10.1142/s0217979217500096.

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The influence of position-dependent mass (PDM) on nonlinear optical absorption (OA) coefficients and refractive index changes (RICs) is theoretically studied, within the framework of the iterative method and the compact-density-matrix approach. Through solving Schrödinger equation, the eigenfunctions and energy eigenvalues are obtained. The analytic expressions of the optical absorption coefficients and the refraction index changes are derived theoretically. The results reveal that the OA coefficients and the RICs are strongly affected by PDM, and both the peaks of them increase when consideri

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20

Beavers, A. H., and Ken R. Olson. "Use of Rayleigh Scatter for Determining X-ray Mass Absorption Coefficients." Soil Science Society of America Journal 50, no. 4 (1986): 1088–91. http://dx.doi.org/10.2136/sssaj1986.03615995005000040051x.

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21

Kouhi, Mohammad. "Nonlinear optical absorption in the core shell nanowire." International Journal of Modern Physics B 31, no. 23 (2017): 1750164. http://dx.doi.org/10.1142/s0217979217501648.

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In this paper, the effect of incident light intensity, relaxation time, core radius and shell thickness on linear, nonlinear, total optical absorption coefficients and refractive index changes in [Formula: see text] core–shell nanowire are theoretically investigated. The presented nanostructure is a cylindrical quantum wire including a shell around the cylinder core. By numerical solution of Schrödinger equation in the cylindrical coordinates with effective mass approximation, the optical absorption coefficients are calculated. The results show that the magnitude of optical absorption coeffici

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22

Ladhaf, Bibifatima M., and Pravina P. Pawar. "Studies on mass energy-absorption coefficients and effective atomic energy-absorption cross sections for carbohydrates." Radiation Physics and Chemistry 109 (April 2015): 89–94. http://dx.doi.org/10.1016/j.radphyschem.2014.12.015.

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23

Yong and, Li, and K. Sumathy. "Experimental Study on Forced Convection Heat Transfer Inside Horizontal Tubes in an Absorption/Compression Heat Pump." Journal of Heat Transfer 124, no. 5 (2002): 975–78. http://dx.doi.org/10.1115/1.1473142.

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Quasi-local absorption heat transfer coefficients and pressure drop inside a horizontal tube absorber have been investigated experimentally, with R-22/DMA as the working pair. The absorber is a counterflow coaxial tube-in-tube heat-exchanger with the working fluid flowing in the inner tube while the water moves through the annulus. A large temperature gliding has been experienced during the absorption process. Experimental results show that the heat transfer coefficient of the forced convective vapor absorption process is higher compared to the vertical falling film absorption. A qualitative s

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24

Toraya, Hideo. "Quantitative Phase Analysis Using the Whole–Powder– Pattern Decomposition Method: II. Solution Using External Standard Materials." Advances in X-ray Analysis 38 (1994): 69–73. http://dx.doi.org/10.1154/s0376030800017651.

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Abstract A new procedure for the quantitative phase analysis using the whole–powder–pattern decomposition method has been proposed (Toraya and Tsusaka, 1995). The procedure is based on the determination of the scale factor for the profile intensity of each phase in a mixture, which is identical to the ratio of integrated intensity in a mixture to that of the corresponding reflection in a single component sample. Weight fractious were obtained by solving the simultaneous equations, of which coefficients include the scale factors and the mass absorption coefficients. In a previous study, the mas

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25

Danilov, Valery A., and Il Moon. "A Method for Estimating Mass Transfer Coefficients in a Packed Column Using Reactive Absorption Data." Collection of Czechoslovak Chemical Communications 70, no. 3 (2005): 383–402. http://dx.doi.org/10.1135/cccc20050383.

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This paper is devoted to the development of a new method for estimating mass transfer coefficients and effective area in packed columns in the case of reactive absorption. The method is based on a plug-flow model of reactive absorption of carbon dioxide with sodium hydroxide solution. The parameter estimation problem is solved using an optimization technique. Some mass transfer parameters are found to be correlated. Global sensitivity analysis by Sobol's technique showed that the unit model with the defined objective function is sensitive to the estimated parameter. Case studies of reactive ab

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26

Zhang, Ting An, Yan Liu, Qiang Wang, Ji Cheng He, and Sano Masamichi. "Enhancement of Absorption of Injected Gas in New Type Mechanical Stirring Injection Refine Equipment." Advanced Materials Research 455-456 (January 2012): 97–102. http://dx.doi.org/10.4028/www.scientific.net/amr.455-456.97.

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The bubble disintegration is of great scientific importance in metal refining, In order for further improvement, Research on bubble disintegration and dispersion becomes necessary, The intensification of bubble disintegration experiment that we have done in cold water model by study absorption rate ,The purpose is to research bubble disintegration under difference experimental condition . In this paper, we use mass transfer coefficients stand for absorption rate, we also study utilization rate, we want to research the best experimental condition which can enhance mass transfer coefficients and

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27

Mahmoud A. Elawi. "Mass Attenuation Coefficient Measurements of Photoelectric Absorption of Gamma-Rays in Copper Using Coincidence Technique." Tikrit Journal of Pure Science 25, no. 4 (2020): 80–85. http://dx.doi.org/10.25130/tjps.v25i4.275.

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The photoelectric absorption mass attenuation coefficients (m.a.c.) of ɤ- rays in Cu are measured using a two 3"x3" NaI(Tl) detector coincidence spectrometer at 511, 1173 and 1332keV energy gates using Na-22 and Co-60 point sources. The m.a.c. (in cm²/g) measured by coincidence method were lower than those obtained from direct measurement. Coincidence measurements revealed the coefficients 0.0429, 0.0212 and 0.0205 and direct measurements the coefficients 0.0561, 0.0239 and 0.0220 for the studied energies respectively. The μm (co) /μm (dir) ratios were 0.763, 0.8900 and 0.9345at the three ener

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28

Xu, X., W. Zhao, Q. Zhang, et al. "Optical properties of atmospheric fine particles near Beijing during the HOPE-J<sup>3</sup>A Campaign." Atmospheric Chemistry and Physics Discussions 15, no. 22 (2015): 33675–730. http://dx.doi.org/10.5194/acpd-15-33675-2015.

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Abstract. The optical properties and chemical composition of PM1.0 (particulate with an aerodynamic diameter of less than 1.0 μm) particles in a suburban environment (Huairou) near the mega-city Beijing were measured during the HOPE-J3A (Haze Observation Project Especially for Jing-Jin-Ji Area) field campaign. The campaign covered the period November 2014 to January 2015 during the winter coal heating season. The average and standard deviations for the extinction, scattering, absorption coefficients, and the aerosol single scattering albedo (SSA) at λ = 470 nm during the measurement period wer

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29

Sayyed, Mohammed I., Ferdi Akman, Veysel Turan, and Aslı Araz. "Evaluation of radiation absorption capacity of some soil samples." Radiochimica Acta 107, no. 1 (2018): 83–93. http://dx.doi.org/10.1515/ract-2018-2996.

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Abstract The aim of the present work is to investigate the radiation absorption capacity of different soil samples in Turkey. For this purpose, we used a γ ray transmission geometry to measure the mass attenuation coefficients of eight soil samples collected between Bingöl city and Solhan district, Turkey at different γ-ray energies in the range of 13.94–88.04 keV. The radioactive sources utilized in the experiment were 241Am, 109Cd and 133Ba. FFAST and WinXCOM programs were used to evaluate the theoretical mass attenuation coefficients values of the selected soil samples. There is a good agre

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30

Elser, Miriam, Benjamin Tobias Brem, Lukas Durdina, et al. "Chemical composition and radiative properties of nascent particulate matter emitted by an aircraft turbofan burning conventional and alternative fuels." Atmospheric Chemistry and Physics 19, no. 10 (2019): 6809–20. http://dx.doi.org/10.5194/acp-19-6809-2019.

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Abstract. Aircraft engines are a unique source of carbonaceous aerosols in the upper troposphere. There, these particles can more efficiently interact with solar radiation than at ground. Due to the lack of measurement data, the radiative forcing from aircraft exhaust aerosol remains uncertain. To better estimate the global radiative effects of aircraft exhaust aerosol, its optical properties need to be comprehensively characterized. In this work we present the link between the chemical composition and the optical properties of the particulate matter (PM) measured at the engine exit plane of a

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31

Umadevi, B., Dinesh P.A., Indira R. Rao, and Vinay C.V. "The Effect of Particle Drag and Wall Absorption on Mass Transfer in Concentric Annulus Flows." Mapana - Journal of Sciences 10, no. 1 (2011): 1–13. http://dx.doi.org/10.12723/mjs.18.1.

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The effects of the irreversible boundary reaction and the particle drag on mass transfer are studied analytically in concentric annulus flows. The solution of mathematical model, based on the generalized dispersion model brings out the mass transport following by the insertion of catheter on an artery in terms of the three effective transport coefficients, viz., the exchange, convection and diffusion coefficient. A general expression is derived which shows clearly the time dependent nature of the coefficients in the dispersive model. The complete time dependent expression for the exchange coef

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32

Dumont, E., G. Darracq, A. Couvert, et al. "Volumetric mass transfer coefficients characterising VOC absorption in water/silicone oil mixtures." Chemical Engineering Journal 221 (April 2013): 308–14. http://dx.doi.org/10.1016/j.cej.2013.01.102.

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33

Vrebos, B. A. R., and P. A. Pella. "Uncertainties in mass absorption coefficients in fundamental parameter X-ray fluorescence analysis." X-Ray Spectrometry 17, no. 1 (1988): 3–12. http://dx.doi.org/10.1002/xrs.1300170103.

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34

Ekanayake, Ruwini S. K., Christopher T. Chantler, Daniel Sier, et al. "High-accuracy measurement of mass attenuation coefficients and the imaginary component of the atomic form factor of zinc from 8.51 keV to 11.59 keV, and X-ray absorption fine structure with investigation of zinc theory and nanostructure." Journal of Synchrotron Radiation 28, no. 5 (2021): 1492–503. http://dx.doi.org/10.1107/s1600577521005981.

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High-accuracy X-ray mass attenuation coefficients were measured from the first X-ray Extended Range Technique (XERT)-like experiment at the Australian Synchrotron. Experimentally measured mass attenuation coefficients deviate by ∼50% from the theoretical values near the zinc absorption edge, suggesting that improvements in theoretical tabulations of mass attenuation coefficients are required to bring them into better agreement with experiment. Using these values the imaginary component of the atomic form factor of zinc was determined for all the measured photon energies. The zinc K-edge jump r

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35

Amaris, Carlos, Maria E. Alvarez, Manel Vallès, and Mahmoud Bourouis. "Performance Assessment of an NH3/LiNO3 Bubble Plate Absorber Applying a Semi-Empirical Model and Artificial Neural Networks." Energies 13, no. 17 (2020): 4313. http://dx.doi.org/10.3390/en13174313.

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In this study, ammonia vapor absorption with NH3/LiNO3 was assessed using correlations derived from a semi-empirical model, and artificial neural networks (ANNs). The absorption process was studied in an H-type corrugated plate absorber working in bubble mode under the conditions of an absorption chiller machine driven by low-temperature heat sources. The semi-empirical model is based on discretized heat and mass balances, and heat and mass transfer correlations, proposed and developed from experimental data. The ANN model consists of five trained artificial neurons, six inputs (inlet flows an

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36

Mužíková, Barbora, Tereza Otcovská, and Pavel Padevět. "WATER ABSORPTION CAPACITY COEFFICIENT AND MASS MOISTURE OF RAMMED EARTH MATERIAL." Acta Polytechnica CTU Proceedings 13 (November 13, 2017): 85. http://dx.doi.org/10.14311/app.2017.13.0085.

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This article presents the development of mass moisture of rammed earth material and determines the water absorption capacity coefficient for rammed earth with illite-kaoline clay. Specimens of two prescriptions were rammed in the moulds. They were settled in the box with soft foam that was moistened. The level of moistening was kept constant. The specimens were regularly measured and weighted. Two measuerements were carried out – one of montmorillonite clay during 13 days and one of illite-kaoline clay during three hours. The development of moisture increase was captured and the water absorpti

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37

Maughan, Richard L., Paul Chuba, Arthur T. Porter, Edgar Ben-Josef, David R. Lucas, and Bengt E. Bjarngard. "Mass energy-absorption coefficients and mass collision stopping powers for electrons in tumors of various histologies." Medical Physics 26, no. 3 (1999): 472–77. http://dx.doi.org/10.1118/1.598544.

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38

Utry, N., T. Ajtai, M. Pintér, et al. "Mass specific optical absorption coefficients of mineral dust components measured by a multi wavelength photoacoustic spectrometer." Atmospheric Measurement Techniques Discussions 7, no. 9 (2014): 9025–46. http://dx.doi.org/10.5194/amtd-7-9025-2014.

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Abstract. Mass specific optical absorption coefficients of various mineral dust components including silicate clays (illite, kaolin and bentonite), oxides (quartz, hematite and rutile), and carbonate (limestone) were determined at wavelengths of 1064, 532, 355 and 266 nm. These values were calculated from aerosol optical absorption coefficients measured by a multi-wavelength photoacoustic (PA) instrument, the mass concentration and the number size distribution of the generated aerosol samples as well as the size transfer functions of the measuring instruments. These results are expected to hav

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Horvath, Isabelle R., and Siddharth G. Chatterjee. "A surface renewal model for unsteady-state mass transfer using the generalized Danckwerts age distribution function." Royal Society Open Science 5, no. 5 (2018): 172423. http://dx.doi.org/10.1098/rsos.172423.

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The recently derived steady-state generalized Danckwerts age distribution is extended to unsteady-state conditions. For three different wind speeds used by researchers on air–water heat exchange on the Heidelberg Aeolotron, calculations reveal that the distribution has a sharp peak during the initial moments, but flattens out and acquires a bell-shaped character with process time, with the time taken to attain a steady-state profile being a strong and inverse function of wind speed. With increasing wind speed, the age distribution narrows significantly, its skewness decreases and its peak beco

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Linke, C., O. Möhler, A. Veres, et al. "Optical properties and mineralogical composition of different Saharan mineral dust samples: a laboratory study." Atmospheric Chemistry and Physics Discussions 6, no. 2 (2006): 2897–922. http://dx.doi.org/10.5194/acpd-6-2897-2006.

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Abstract. In aerosol chamber experiments optical properties of airborne mineral dust samples of defined size distribution were measured. Extinction coefficients (bext) and mass specific extinction cross sections (σext) were determined for Saharan dust samples from different locations. The results for σext were not very sensitive to the type of dust and varied at λ=550 nm between 3.3±0.4 m2 g−1 and 3.7±0.4 m2 g−1. The absorption coefficients (babs) and mass specific absorption cross sections (σabs) were determined with a novel multi-wavelength photo-acoustic absorption spectrometer (PAS). Betwe

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Sobieszuk, Paweł, and Karolina Napieralska. "Investigations of mass transfer in annular gas-liquid flow in a microreactor." Chemical and Process Engineering 37, no. 1 (2016): 55–64. http://dx.doi.org/10.1515/cpe-2016-0006.

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Abstract The paper presents an investigation of mass transfer in gas-liquid annular flow in a microreactor. The microreactor had a meandered shape with a square cross-section of the channel (292×292 μm, hydraulic diameter 292 μm) and 250 mm in length. The rate of CO2 absorption from the CO2/N2 mixture in NaOH (0.1 M, 0.2 M, 0.7 M, 1.0 M and 1.5 M) water solutions was measured. Two velocities of gas flow and two velocities of liquid flow were used. In two cases a fully developed annular flow at the beginning of the channel was observed, whilst in two cases annular flow was formed only in about

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Meler, Justyna, Dagmara Litwicka, and Monika Zabłocka. "Variability of light absorption coefficients by different size fractions of suspensions in the southern Baltic Sea." Biogeosciences 20, no. 12 (2023): 2525–51. http://dx.doi.org/10.5194/bg-20-2525-2023.

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Abstract. Measurements of light absorption coefficients by particles suspended in seawater (ap(λ)), by phytoplankton (aph(λ)) and detritus (ad(λ)) were carried out in the southern Baltic Sea for the original seawater samples and four size fractions: pico-particles (0.2–2 µm), ultra-particles (2–5 µm), nano-particles (5–20 µm) and micro-particles (20–200 µm). Chlorophyll a (Chl a) and suspended particulate matter (SPM) concentrations were determined. The proportions of particles from the size classes in the ap(443), aph(443) and ad(443) were determined. Pico- and ultra-particles had the largest

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Prieto, Cristina, Harry Alvarez-Ospina, Dara Salcedo, Telma Castro, and Oscar Peralta. "Mass Absorption Efficiency of PM1 in Mexico City during ACU15." Atmosphere 14, no. 1 (2023): 100. http://dx.doi.org/10.3390/atmos14010100.

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From January to March 2015, an atmospheric aerosol measurement campaign, “Aerosoles en Ciudad Universitaria 2015” (ACU15), was carried out in Mexico City to determine the particles’ optical properties and chemical composition. Two photoacoustic spectrometers measured the scattering and absorption coefficient at two different wavelengths. The average absorption coefficient at 532 nm was 12.71 ± 9.48 Mm−1 and at 870 nm was 10.35 ± 7.36 Mm−1. The average scattering coefficient was 65.63 ± 47.12 Mm−1 (532 nm) and 21.12 ± 14.24 Mm−1 (870 nm). The chemical composition was determined via an aerosol c

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Pérez Sánchez, Amaury, Helen M. Alfonso Fernández, Greisy I. Valero Almanza, Nadia Corpas Rodríguez, and Alicia M. Gómez Julián. "Designing a Packed Column for Ammonia Recovery: Evaluating Two Packing Types." Revista de Ciencia y Tecnología, no. 43 (June 14, 2025): 119–31. https://doi.org/10.36995/j.recyt.2025.43.010.

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Gas absorption is a mass transfer operation that involves separating components from a gaseous mixture by contacting them with a suitable liquid, typically performed in packed columns. In this study, a packed column was designed for the absorption of gaseous ammonia using water as a solvent, and two types of packing were evaluated: ceramic Raschig rings and metallic Hiflow rings. The use of Hiflow rings resulted in a 30.35% reduction in column diameter compared to Raschig rings. Furthermore, the total pressure drop of the gas-liquid system at 70% flooding was 17.81% lower for Hiflow rings (522

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Rudinsky, Samantha, Nicholas C. Wilson, Colin M. MacRae, et al. "The Impact of Chemical Bonding on Mass Absorption Coefficients of Soft X-rays." Microscopy and Microanalysis 26, no. 4 (2020): 741–49. http://dx.doi.org/10.1017/s1431927620001579.

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Ovejero, G., R. Van Grieken, L. Rodriguez, and J. L. Valverde. "The use of gas absorption correlations for mass transfer coefficients in distillation processes." International Journal of Heat and Mass Transfer 35, no. 11 (1992): 2963–68. http://dx.doi.org/10.1016/0017-9310(92)90316-k.

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Zərbaliyev, Tərlan, Raşit Çakır, and Hasan Yıldırım. "Energy Levels and Absorption Coefficients for Diverse Bounded Potentials: A Comprehensive Analysis." Recep Tayyip Erdoğan Üniversitesi Fen ve Mühendislik Bilimleri Dergisi 6, no. 1 (2025): 14–31. https://doi.org/10.53501/rteufemud.1446402.

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This article presents a comprehensive numerical investigation into the energy levels and absorption coefficients within quantum well structures, with a particular focus on the GaAs/AlGaAs system. Various bounded potentials, including the Rosen-Morse potential, Wood-Saxon potential, Pöschl-Teller potential, Razavy potential, inversely quadratic Hellmann potential, Kratzer-Fues potential, and Morse potential, are explored. Employing the Schrödinger equation, with considerations for effective mass and envelope function approximations, a discrete formulation is attained through finite differences.

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Tekerek, Saniye*. "Investigation of the Mass Attenuation Coefficients, Effective Atomic Numbers and Electron Densities for Compounds of Painkiller." Journal of Biomedical Research & Environmental Sciences 2, no. 1 (2021): 034–37. https://doi.org/10.37871/jbres1184.

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In this study the effects of gamma radiations with compounds are an important subject in the field of medicine, radiation shielding and radiation physics. With technological advances the using of radiation has increased in the medicine in the last century. The mass absorpsion coefficient (μ/ρ) is the fundamental a quantity characterizing gamma ray and is of major importance in radiation shielding. In this study, the mass absorption coefficient of painkillers named Ketoprofen, Flurbiprofen, Etodolac, Ibuprofen, Meloxicam, Diclofenac and Aspirin were calculated at energy range from 4.65 k

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Gurler, O., H. Oz, S. Yalcin, and O. Gundogdu. "Mass absorption and mass energy transfer coefficients for 0.4–10MeV gamma rays in elemental solids and gases." Applied Radiation and Isotopes 67, no. 1 (2009): 201–5. http://dx.doi.org/10.1016/j.apradiso.2008.10.001.

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Roy, Ashis Kumar, Apu Kumar Saha, and Sudip Debnath. "Unsteady Convective Diffusion with Interphase Mass Transfer in Casson Liquid." Periodica Polytechnica Chemical Engineering 62, no. 2 (2017): 215. http://dx.doi.org/10.3311/ppch.10328.

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This study aims to examine the dispersion of a passive contaminant of solute released in Casson liquid flow through a tube. The wall of the tube is taken to be chemically active where the flow is driven by the constant pressure gradient. To evaluate the transport coefficients, Aris-Barton’s Moment technique is considered, a finite difference implicit scheme is adopted to handle the differential equation arises in moment methodology. Also to confirm the results obtained by Aris-Barton’s method, the generalized dispersion model has been applied. Unlike the previous studies on dispersion in Casso

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