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Journal articles on the topic 'Coefficient of refraction'

Author: Grafiati

Published: 28 May 2022

Last updated: 31 July 2025

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1

Ojeda Pardo, F. R., O. Belette Fuentes, V. E. Quiroz Cabascango, A. P. Mosquera Urbano, and E. Reyes Céspedes. "Determination of the local refraction coefficient in Cuban lateritic mineral deposits." Journal of Physics: Conference Series 2573, no. 1 (2023): 012009. http://dx.doi.org/10.1088/1742-6596/2573/1/012009.

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Abstract Much work has been done related to the characteristics of terrestrial refraction. However, very few have referred to the fluctuations of the refractive coefficient in the lower atmosphere in Cuban lateritic deposits. The objective of this research is to determine a local refraction coefficient in different climatic conditions and time of day, to increase the precision of the mineral volume calculation and to know its behavior and to analyze the influence of local refraction coefficient variations on the trigonometric leveling. The method of reciprocal simultaneous measurements of the

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2

RAMM, A. G. "A METHOD FOR CREATING MATERIALS WITH A DESIRED REFRACTION COEFFICIENT." International Journal of Modern Physics B 24, no. 27 (2010): 5261–68. http://dx.doi.org/10.1142/s0217979210056074.

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It is proposed to create materials with a desired refraction coefficient in a bounded domain D ⊂ ℝ3 by embedding many small balls with constant refraction coefficients into a given material. The number of small balls per unit volume around every point x ∈ D, i.e., their density distribution, is calculated, as well as the constant refraction coefficients in these balls. Embedding into D small balls with these refraction coefficients according to the calculated density distribution creates in D a material with a desired refraction coefficient.

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3

Dementiev, D. V. "Analysis of methods for determining the refraction coefficient in the atmospheric surface layer." Geodesy and Cartography 947, no. 5 (2019): 2–11. http://dx.doi.org/10.22389/0016-7126-2019-947-5-2-11.

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In the instructions for modern geodetic instruments, it is recommended to introduce an amendment for the refraction, taking into account the “standard” refraction coefficient k = 0,13÷0,2. In fact, in the surface layer of the atmosphere, the refractive index can range from –6 to 6. Various classical methods of determining refraction are analyzed. Conclusions based on experimental work made by various researchers are presented. Using the results of numerous studies of various methods for determining vertical refraction, it can be concluded that all classical (static) methods do not provide a hi

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4

Derdar, Mawaheb M., Asia A. Almeshergi, Najia E. Elgandouri, and Mohamed M. Amer. "New Correlation for Second Virial Coefficients by Using Refractive Index." International Science and Technology Journal 35, no. 1 (2024): 1–14. http://dx.doi.org/10.62341/mana1035.

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The development of a virial equation of state requires understanding numerous interaction virial coefficients. Given the relationship between these coefficients and the intermolecular potential, the corresponding states principle (CSP) can also be applied to extend its use to virial coefficients. In this study, the second virial coefficient has been developed using molar refraction. Molar refraction (R) is directly related to a substance's polarizability, which influences how molecules interact with each other. The more polarizable a molecule is, the stronger the attractive forces between them

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Ci, Long Sheng, and Gui Lan Yu. "Propagation of SH Waves through an Interface between a Phononic Crystal and a Uniform Solid." Materials Science Forum 675-677 (February 2011): 1061–64. http://dx.doi.org/10.4028/www.scientific.net/msf.675-677.1061.

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The reflection and refraction of harmonic SH waves at the interface between a homogeneous solid and a one-dimensional phononic crystal is studied. The effects of wave frequencies on the refraction coefficients are investigated. The results show that for lower frequencies, most part of the energy is reflected into the homogeneous solid and that the frequency has little effects on the energy distribution at the interface. While for higher frequencies, SH waves cannot propagate in some directions because of the existence of the directional band gaps, which results in the discontinuity in the refr

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6

Bezdetko, P., and R. Parkhomets. "STUDY OF PERIPHERAL REFRACTION IN CHILDREN WITH MYOPIA WITH ORTHOKERATOLOGY LENSES OF COMBINED DESIGN." East European Scientific Journal 2, no. 4(68) (2021): 38–46. http://dx.doi.org/10.31618/essa.2782-1994.2021.2.68.19.

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Progressive myopia is a leading problem in modern optometry and ophthalmology in general. In recent years, refractive therapy with orthokeratology lenses has gained popularity among methods to control myopia progression. The aim: To study peripheral refraction in children with myopia with the use of orthokeratology lenses (OKL) of combined design. Methods. We followed up 60 children (117 eyes) diagnosed with uncomplicated mild to moderate myopia. All children underwent a complete ophthalmological examination as well as corneal keratotopography and peripheral refraction determination. Statistic

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7

Bryn, Mikhail Y., Yulia V. Lobanova, and Dmitry A. Afonin. "DETERMINING AND CONSIDERING A REFRACTIVE INDEX ON CONSTRUCTION SITE." Vestnik SSUGT (Siberian State University of Geosystems and Technologies) 27, no. 1 (2022): 6–14. http://dx.doi.org/10.33764/2411-1759-2022-27-1-6-14.

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Taking into account the refraction in modern total station is performed by inputting the refrac-tion coefficient into the memory of the device. The article develops a formula to determine the refrac-tion coefficient based on geodetic surveys (zenith distances, horizontal positions, elevations) and pro-vides field survey results. The article proposes the method for creation of the vertical basis (a geodetic structure consisting of the points fixed on a vertical plane on one vertical line and ground points with highly accurate differences in elevations determined between them).The article provid

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8

Carracedo, Gonzalo, Carlos Carpena-Torres, Cristina Pastrana, Ana Privado-Aroco, María Serramito, and Laura Batres. "Repeatability of Aberrometry-Based Automated Subjective Refraction in Healthy and Keratoconus Subjects." Journal of Ophthalmology 2020 (October 29, 2020): 1–7. http://dx.doi.org/10.1155/2020/4831298.

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Purpose. To compare the intersession repeatability of the Eye Refract, a new instrument to perform aberrometry-based automated subjective refraction, on healthy and keratoconus subjects. Materials and Methods. A cross-sectional and randomized study was performed. A total of 64 participants were evaluated in the study, selecting one eye per participant randomly. The sample was divided into two different groups: 33 healthy subjects (38.85 ± 13.21 years) and 31 with keratoconus (37.29 ± 11.37 years). Three refractions per participant with the Eye Refract were performed on three different days, wi

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9

Baselga, Sergio, Luis García-Asenjo, and Pascual Garrigues. "Practical Formulas for the Refraction Coefficient." Journal of Surveying Engineering 140, no. 2 (2014): 06014001. http://dx.doi.org/10.1061/(asce)su.1943-5428.0000124.

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10

Palmer, Derecke. "Resolving refractor ambiguities with amplitudes." GEOPHYSICS 66, no. 5 (2001): 1590–93. http://dx.doi.org/10.1190/1.1487104.

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Amplitudes are used to constrain refraction models. This study demonstrates that the refraction time section generated through the convolution of forward and reverse refraction traces together with a static shift facilitates the convenient recognition of amplitude variations related to changes in refractor wavespeed. For large contrasts in wavespeeds between the upper layer and the refractor, the head coefficient is approximately proportional to the ratio of the specific acoustic impedances. Since the convolution operation effectively multiplies the amplitudes of the forward and reverse arriva

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11

Bektanov, Bolatbek, Omar Sarybayev, Gauhar Serikbayeva, and Azamat Kaldybekov. "STUDY OF ATMOSPHERE INFLUENCE ON RESULTS OF DISTANCE MEASUREMENTS." Interexpo GEO-Siberia 9 (2019): 137–43. http://dx.doi.org/10.33764/2618-981x-2019-9-137-143.

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The article describes a method based on the relationship of the integral index of refraction of air with its integral altitude gradient. The refractive index N and its altitude gradient dN / dH are proportional to each other under conditions of limited atmospheric height. It has been established that the gradient of the refractive index can be found by the index itself with a known coefficient of coupling between them. Wherein, it is easy to find the gradient by the angle of complete refraction. Results of experimental studies and recommendations for its use are given. A correlation analysis o

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Rinkevich, A. B., D. V. Perov, E. A. Kuznetsov, and M. A. Milyaev. "Caused by the giant magnetoresistive effect changes of microwave refractive index." Доклады Академии наук 487, no. 6 (2019): 622–25. http://dx.doi.org/10.31857/s0869-56524876622-625.

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Studies of the interaction of electromagnetic microwaves with [Co88Fe12/Cu]n, nanostructures, in which the giant magnetoresistive effect (GMR) shows itself, have been carried out. It is established that the GMR effect contributes to changes in the microwave complex refraction coefficient, including the refractive index.

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13

Neupane, Tikaram, Bagher Tabibi, Wan-Joong Kim, and Felix Jaetae Seo. "Spatial Self-Phase Modulation in Graphene-Oxide Monolayer." Crystals 13, no. 2 (2023): 271. http://dx.doi.org/10.3390/cryst13020271.

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The spatial self-phase modulation (SSPM) of the optical field revealed the magnitude and polarity of nonlinear refraction coefficients of the graphene-oxide (GO) atomic layers in an aqueous base solution with a resonant excitation using a chopped quasi-static laser at 532 nm. The SSPM of the optical field as a result of the intrinsic nonlinear refraction coefficient of GO atomic layers and the spatial distribution of intensity displayed the concentric diffraction rings at the far field due to the coherent superposition of transverse wave vectors. The number of concentric rings as a function of

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14

Ramm, A. G. "Preparing materials with a desired refraction coefficient." Nonlinear Analysis: Theory, Methods & Applications 71, no. 12 (2009): e186-e190. http://dx.doi.org/10.1016/j.na.2008.10.011.

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15

Guo, Tao, and Zeng Ping Liu. "Light Capacitance Type Refractometer to Measure Atmosphere Parameter." Applied Mechanics and Materials 367 (August 2013): 297–301. http://dx.doi.org/10.4028/www.scientific.net/amm.367.297.

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The precise measure of atmospheric refractive index is one of the key factors which leads a guarantee of accurate estimate in the atmospheric refraction error margin and the forecast of atmosphere wave in the electronics systems, such as radar and correspondence...etc.. The error of 59 radiosonde which are in common used to measure atmospheric refractive refraction index is bigger, the microwave refract meter which has high accuracy also has the characteristics of high expenses, big weight of the instrument, those all bring very big restriction to engineering physically applications. For this

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16

Xie, Xinxin, Junyi Chen, Mengna Zhou, et al. "A method of liquid refractive index measurement based on image correlation coefficient." Journal of Physics: Conference Series 2724, no. 1 (2024): 012030. http://dx.doi.org/10.1088/1742-6596/2724/1/012030.

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Abstract According to the difference of speckle image caused by the axial displacement due to the refraction of a transparent medium, the liquid refractive index is measured by using the image correlation coefficient. An optical measurement system based on laser speckle is built into the experiment. Firstly, the CCD camera is adjusted to move along the optical axis in air, and multiple speckle images at different positions are collected, which are correlated with the speckle image at zero position to obtain the image correlation coefficients, and then the exponential calibration relation betwe

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Wang Zhenqiang, Wang Zhenqiang, Chen Xiliang Chen Xiliang, and Liu Wei Liu Wei. "Dielectric Properties of MWNTs/HDPE Composites in Terahertz Region Studied with Reverse Effective Medium Approach." Journal of the chemical society of pakistan 42, no. 3 (2020): 358. http://dx.doi.org/10.52568/000657.

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Optical properties of composites MWNTs/HDPE were explored by terahertz time-domain spectroscopy (THz-TDS). It was found that with the increasing of frequency from 0.4 to 2 THz the absorption coefficient increases gradually whereas the refractive index decreases. Furthermore, composites with thick MWNTs possesses larger absorption coefficient and index of refraction compared to that with the thin MWNTs at the same concentration. The dielectric properties of the MWNTs were extracted with reverse effective medium approach (REMA) from that of the composites. The results of the absorption coefficie

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Wang Zhenqiang, Wang Zhenqiang, Chen Xiliang Chen Xiliang, and Liu Wei Liu Wei. "Dielectric Properties of MWNTs/HDPE Composites in Terahertz Region Studied with Reverse Effective Medium Approach." Journal of the chemical society of pakistan 42, no. 3 (2020): 358. http://dx.doi.org/10.52568/000657/jcsp/42.03.2020.

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Optical properties of composites MWNTs/HDPE were explored by terahertz time-domain spectroscopy (THz-TDS). It was found that with the increasing of frequency from 0.4 to 2 THz the absorption coefficient increases gradually whereas the refractive index decreases. Furthermore, composites with thick MWNTs possesses larger absorption coefficient and index of refraction compared to that with the thin MWNTs at the same concentration. The dielectric properties of the MWNTs were extracted with reverse effective medium approach (REMA) from that of the composites. The results of the absorption coefficie

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19

Journal, Baghdad Science. "Study of Nonlinear Refraction and Nonlinear Absorption Coefficients of Different CdS Film Thickness by diode laser." Baghdad Science Journal 10, no. 1 (2013): 217–25. http://dx.doi.org/10.21123/bsj.10.1.217-225.

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In the present work, different thicknesses of CdS film were prepared by chemical bath deposition. Z-Scan technique was used to study the nonlinear refractive index and nonlinear absorption coefficients. Linear optical testing were done such as transmission test, and thickness of films were done by the interference fringes (Michelson interferometer). Z-scan experiment was performed at 650nm using CW diode laser and at 532nm wavelength. The results show the effect of self-focusing and defocusing that corresponds with nonlinear refraction n2. The effect of two-photon absorption was also studied,

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20

Wang, An Ling, and Fu Ping Liu. "The Phase Shift of Reflection and Refraction of SH-Wave at an Interface of Two Media ." Advanced Materials Research 983 (June 2014): 388–91. http://dx.doi.org/10.4028/www.scientific.net/amr.983.388.

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Using the reflection and refraction coefficient of SH wave at the interface of strata, we derived the phase shift of total reflection and refraction SH-wave, The results show that, the phase shift reflection than the phase shift refraction, phase shift of reflection 2 times the phase shift of refraction.

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21

AKINLAMI, J. O., and I. O. OLATEJU. "INVESTIGATION OF COMPLEX INDEX OF REFRACTION OF GALLIUM NITRIDE GaN." Journal of Natural Sciences Engineering and Technology 14, no. 2 (2018): 29–39. http://dx.doi.org/10.51406/jnset.v14i2.1752.

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An understanding of the complex index of refraction of Gallium Nitride (GaN) is important because of the increasing application of GaN in many high frequency, optical and electronics devices. Complex index of refraction of Gallium Nitride (GaN)have been investigated theoretically by means of Kramers and Kronig method in the photon energy range 2.0 â€“ 10.0eV. We obtained refractive index which has a maximum value of 2.89 at photon energy 7.0eV, the extinction coefficient which has a maximum value of 1.17 at photon energy 7.0eV, the dielectric constant, the real part of the complex dielectric c

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22

Jen, Yi-Jun, Wei-Chieh Ma, and Ting-Yen Lin. "Obliquely Bideposited TiN Thin Film with Morphology-Dependent Optical Properties." Coatings 11, no. 11 (2021): 1418. http://dx.doi.org/10.3390/coatings11111418.

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TiN thin films were obliquely bideposited with different subdeposit thicknesses. The morphology of the bideposited film was varied from a nano-zigzag array to a vertically grown columnar structure by reducing the subdeposit thickness. The principal index of refraction and extinction coefficient were obtained to explain the measured reflectance and transmittance spectra. The loss of the bideposited thin film decreased as the thickness of the subdeposit decreased. The principal indices for normal incidence were near or under unity, indicating the low reflection by the bideposited thin films. A T

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Blaney, Giles, Angelo Sassaroli, and Sergio Fantini. "Method for Measuring Absolute Optical Properties of Turbid Samples in a Standard Cuvette." Applied Sciences 12, no. 21 (2022): 10903. http://dx.doi.org/10.3390/app122110903.

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Many applications seek to measure a sample’s absorption coefficient spectrum to retrieve the chemical makeup. Many real-world samples are optically turbid, causing scattering confounds which many commercial spectrometers cannot address. R1C1Using diffusion theory and considering absorption and reduced scattering coefficients on the order of 0.01/mm and 1/mm, respectively, we develop a method which utilizes frequency-domain to measure absolute optical properties of turbid samples in a standard cuvette ( 45x10x10mm). Inspired by the self-calibrating method, which removes instrumental confounds,

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AL Hussainey, Afrah M., Ruaa Kahtan Mahmoud, and Talib M. Abbas ALShafie. "Study the Optical and Spectral Properties of the Acridine Dye As an Effective Medium in Dye Lasers." JOURNAL OF UNIVERSITY OF BABYLON for Pure and Applied Sciences 26, no. 10 (2018): 167–80. http://dx.doi.org/10.29196/jubpas.v26i10.1852.

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In this study, the absorption and fluorescence spectra of the dissolved Acridine solution were studied in ethanol and different concentrations. The optical properties (absorption coefficient, linear refraction) and spectral characteristics (Fluorescence time and quantitative fluoridation efficiency) were calculated. It is observed that increasing the concentration increases the absorbance values and decreases the permeability values, thus increasing the values of the absorption coefficient and the refractive index. Also, the values of the fluorine intensity increase. The peak of the emission s

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Chniti, M., C. Cassagne, J. L. Godet, and G. Boudebs. "Investigation of the third-order nonlinear optical properties in porphyrin solutions in the picosecond regime." Journal of Nonlinear Optical Physics & Materials 24, no. 03 (2015): 1550030. http://dx.doi.org/10.1142/s0218863515500307.

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The D4σ-Z-scan technique is used to evaluate the sign and the magnitude of the nonlinear (NL) refractive index and the NL absorption (NLA) coefficient with a laser delivering single pulses in the picosecond regime at 355 nm, 532 nm and 1064 nm. The NL optical response of the zinc porphyrins (Pph) has been found to be significantly enhanced. The study of the NLA and refraction is performed, taking into account the time dependence and the spectral width of the incident laser. The variations of the NL coefficients as a function of the intensity and the concentration are provided and are found to

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Куракин, В. Г., та П. В. Куракин. "Механизмы отражения и преломления пучка заряженных частиц в рассеивающей среде". Журнал технической физики 89, № 12 (2019): 1843. http://dx.doi.org/10.21883/jtf.2019.12.48480.60-18.

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The mathematical model describing the reflection and refracting phenomena at incline border of scattering medium and vacuum for a moving charged particle traversing this border is suggested. To build such a model, the distribution function for multiple Coulomb scattering processes in unbounded medium is used. Formulae for refraction angle and reflection coefficient are derived followed by numerical calculations and appropriate plots.

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Othman, M. I., and Y. Q. Song. "Reflection and refraction of thermo-viscoelastic waves at the interface between two micropolar viscoelastic media without energy dissipation." Canadian Journal of Physics 85, no. 7 (2007): 797–812. http://dx.doi.org/10.1139/p07-072.

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Reflection and refraction of a plane harmonic wave at the interface between two viscoelastic media are studied under generalized thermo-viscoelastic theory. Using potential function, the governing equations reduce to two fourth-order ifferential equations. Coefficient ratios of reflection and refraction of different waves with the angle of incidence are obtained using continuous boundary conditions. By numerical calculations, the variation of coefficient ratios of reflection and refraction with the angle of incidence are illustrated graphically for aluminium–epoxy and magnesium crystal micropo

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Wisse, Robert P. L., Marc B. Muijzer, Francesco Cassano, Daniel A. Godefrooij, Yves F. D. M. Prevoo, and Nienke Soeters. "Validation of an Independent Web-Based Tool for Measuring Visual Acuity and Refractive Error (the Manifest versus Online Refractive Evaluation Trial): Prospective Open-Label Noninferiority Clinical Trial." Journal of Medical Internet Research 21, no. 11 (2019): e14808. http://dx.doi.org/10.2196/14808.

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Background Digital tools provide a unique opportunity to increase access to eye care. We developed a Web-based test that measures visual acuity and both spherical and cylindrical refractive errors. This test is Conformité Européenne marked and available on the Easee website. The purpose of this study was to compare the efficacy of this Web-based tool with traditional subjective manifest refraction in a prospective open-label noninferiority clinical trial. Objective The aim of this study was to evaluate the outcome of a Web-based refraction compared with a manifest refraction (golden standard).

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Nikonov, Anton V., Victor A. Skripnikov, and Margarita A. Skripnikova. "APPLICATION OF HIGH-PRECISION TRIGONOMETRIC LEVELING IN DEFORMATION MONITORING OF HYDRAULIC STRUCTURES." Interexpo GEO-Siberia 1 (May 21, 2021): 85–92. http://dx.doi.org/10.33764/2618-981x-2021-1-85-92.

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The article proposes to use high-precision trigonometric leveling when determining the deformations of hydraulic structures. The required accuracy can be ensured by measuring the excess with automated high-precision total station and observing a number of conditions. Recommendations are given for the modernization of one of the sections at the Novosibirsk hydroelectric power station. The results of field studies on the determination of the refraction coefficient by the geodetic method are presented. During a summer day (from 10 to 18 hours), a change in the coefficient of refraction was record

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Meiers, Dairis, Anete Kursīte, and Guna Laganovska. "Refractive Outcome and Influencing Factors of Postoperative Refraction in Cataract Surgery." Acta Chirurgica Latviensis 17, no. 2 (2017): 17–20. http://dx.doi.org/10.1515/chilat-2017-0018.

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Abstract Introduction. Phacoemulsification with intraocular lens implantation provide high visual acuity after procedure, increasing quality of life and vision. The aim of procedure is to gain a target refraction, in most cases emmetropia, when a patient does not need visual correction for a distant sight (1). Although the preoperative evaluation and surgery technique has developed in the last years, it is not possible to gain the target refraction in all cases. There still are patients with high postoperative error, which means that there are influencing factors that should be identified. Aim

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Rozanova, O. I., S. V. Kuzmin, O. P. Mishchenko, B. A. Tsibzhitova, Ye V. Arkhipov, and A. A. Ivanov. "Pyramidal sensory wavefront aberrometry as a method for visualizing intraocular refractive errors in articulation." Journal of Volgograd State Medical University 21, no. 1 (2024): 56–63. https://doi.org/10.19163/1994-9480-2024-21-1-56-63.

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The results of pyramidal sensory wavefront aberrometry with the construction of refractive topographic maps (Peramis, SCHWIND eye-tech-solutions GmbH, Germany) were analyzed in 67 patients (108 eyes) with artifacia (with various types of IOL). The values of the spherical component of refraction of the eye, established by autorefractometry and pyramidal aberrometry of the wavefront, have a high correlation coefficient (r = 0.921, p < 0.0001). The construction of refractive topographic maps of intraocular structures of the eye is a method of customized diagnosis in patients with artifacia and

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Aziz, Shujahadeen B., Sarkawt Hussein, Ahang M. Hussein, and Salah R. Saeed. "Optical Characteristics of Polystyrene Based Solid Polymer Composites: Effect of Metallic Copper Powder." International Journal of Metals 2013 (December 12, 2013): 1–6. http://dx.doi.org/10.1155/2013/123657.

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Solid polymer composites (SPCs) were prepared by solution cast technique. The optical properties of polystyrene doped with copper powder were performed by means of UV-Vis technique. The optical constants were calculated by using UV-Vis spectroscopy. The dispersion regions were observed in both absorption and refractive index spectra at lower wavelength. However, a plateau can be observed at high wavelengths. The small extinction coefficient compared to the refractive index reveals the transparency of the composite samples. The refractive index and optical band gap were determined from the refl

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Indratno, Sapto W., and Alexander G. Ramm. "Creating materials with a desired refraction coefficient: numerical experiments." International Journal of Computing Science and Mathematics 3, no. 1/2 (2010): 76. http://dx.doi.org/10.1504/ijcsm.2010.033928.

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Hamid, L. A., M. H. Dwech, and K. A. Aadim. "Influence of Laser Energy on the Optical Properties of Ag2S ITO Thin Films Prepared by the PLD Technique." Ukrainian Journal of Physics 65, no. 2 (2020): 179. http://dx.doi.org/10.15407/ujpe65.2.179.

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Nanocrystalline silver sulfide (Ag2S) thin films were prepared by the pulse laser deposition technique (PLD) on the indium-tin oxide (ITO) substrate at room temperature. In the PLD technique, an Nd : YAG laser with a wavelength of 1064 nm at different laser energies from 400 to 900 mJ is used with an increment of 100 mJ in each step with 200 pulses for each sample. The optical properties such as the refraction index n, absorption coefficient a, and extinction coefficient k are examined using the transmission and absorbance measurements on a UV-Vis-NIR spectrophotometer in the wavelength range

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Wu, Rihan, Jack Collins, Leigh Canham, and Andrey Kaplan. "The Influence of Quantum Confinement on Third-Order Nonlinearities in Porous Silicon Thin Films." Applied Sciences 8, no. 10 (2018): 1810. http://dx.doi.org/10.3390/app8101810.

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We present an experimental investigation into the third-order nonlinearity of conventional crystalline (c-Si) and porous (p-Si) silicon with Z-scan technique at 800-nm and 2.4- μ m wavelengths. The Gaussian decomposition method is applied to extract the nonlinear refractive index, n 2 , and the two-photon absorption (TPA) coefficient, β , from the experimental results. The nonlinear refractive index obtained for c-Si is 7 ± 2 × 10 − 6 cm 2 /GW and for p-Si is − 9 ± 3 × 10 − 5 cm 2 /GW. The TPA coefficient was found to be 2.9 ± 0.9 cm/GW and 1.0 ± 0.3 cm/GW for c-Si and p-Si, respectively. We s

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Oca, Laura, Jose Miguel Campillo-Robles, and M. Mounir Bou-Ali. "Review and analysis of thermophysical properties of a sulfuric acid-water electrolyte." Journal of Chemical and Engineering Data 63, no. 9 (2018): 3572–83. https://doi.org/10.1021/acs.jced.8b00466.

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In this work, we have performed a critical review of the thermophysical properties of sulfuric acid−water mixtures. The thermophysical properties analyzed are density, viscosity, refraction index, thermal expansion coefficient, and mass expansion coefficient. The density of the sulfuric acid−water mixture has been measured for different mass fractions (<em>w</em> = 0.1− 0.4) over a broad temperature range (<em>T</em> = 273.15−333.15 K). A new parametrization of the density has been performed using a least-squares method. In this parametrization, the number of coefficien

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Neupane, Tikaram, Uma Poudyal, Bagher Tabibi, Wan-Joong Kim, and Felix Jaetae Seo. "Cubic Nonlinearity of Graphene-Oxide Monolayer." Materials 16, no. 20 (2023): 6664. http://dx.doi.org/10.3390/ma16206664.

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The cubic nonlinearity of a graphene-oxide monolayer was characterized through open and closed z−scan experiments, using a nano-second laser operating at a 10 Hz repetition rate and featuring a Gaussian spatial beam profile. The open z−scan revealed a reverse saturable absorption, indicating a positive nonlinear absorption coefficient, while the closed z−scan displayed valley-peak traces, indicative of positive nonlinear refraction. This observation suggests that, under the given excitation wavelength, a two-photon or two-step excitation process occurs due to the increased absorption in both t

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Xiao, Ying, and Yu Hua Dong. "Empirical Method of Atmospheric Refraction Error Correction in Optical Low-Level Measuring." Advanced Materials Research 108-111 (May 2010): 608–12. http://dx.doi.org/10.4028/www.scientific.net/amr.108-111.608.

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This paper proposed a empirical method of atmospheric refraction error correction in optical low-level measuring. The experience attenuation coefficient was derived by using the data of previous tests, then it solved the problem of atmospheric refraction error correction under the condition does not have a sounding measurements. At the same time, this paper deduced the empirical formula of atmospheric refraction error correction in low-level measuring, using the empirical formula of atmospheric refraction error correction can overcome the stationary point problem in the traditional method when

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Ehab, Mohamed, Elsayed Salama, Ahmed Ashour, Mohamed Attallah, and Hosam M. Saleh. "Optical Properties and Gamma Radiation Shielding Capability of Transparent Barium Borosilicate Glass Composite." Sustainability 14, no. 20 (2022): 13298. http://dx.doi.org/10.3390/su142013298.

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In this study, both radiation shielding capability and optical properties of prepared SiO2-ZnO-Na2CO3-H3BO3-BaCO3 glass composite with different concentrations of barium carbonate (0–30 mol%) have been studied. Gamma attenuation properties, such as the mass attenuation coefficient (MAC), mean free path (MFP), and exposure build-up factor (EBF), are experimentally and theoretically investigated. The detected XRD patterns for the prepared glass composites confirm their amorphous nature. It is evident from the obtained data that all tested parameters, such as mass density, molar volume, refractiv

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Debadrita Roy, Sukdev Majumder, Biplab Rajbanshi, Subhadeep Saha, and Biswajit Sinha. "Physicochemical investigation of L-Asparagine in green solvent arrangements with the manifestation of solvation consequences." World Journal of Advanced Research and Reviews 13, no. 2 (2022): 401–28. http://dx.doi.org/10.30574/wjarr.2022.13.2.0164.

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Solution behaviour prevailing in L-Asparagine in two aqueous ionic liquid solutions, namely (Benzyl tri–methyl ammonium chloride; Benzyl tri-ethyl ammonium chloride) have been studied by investigation of physico-chemical parameters; density, viscosity, refractive index, conductance and surface tension measurement respectively. The nature of interactions occurring in the solution have been calculated on the basis of apparent molar volume, viscosity A and B-coefficient, molar refraction at 298.15K,303.15K,308.15K and at 0.001m, 0.003m, 0.005m concentrations. The limiting apparent molar volumes (

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Šegatin, Nataša, Tanja Pajk Žontar, and Nataša Poklar Ulrih. "Dielectric Properties and Dipole Moment of Edible Oils Subjected to ‘Frying’ Thermal Treatment." Foods 9, no. 7 (2020): 900. http://dx.doi.org/10.3390/foods9070900.

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The dielectric properties of six refined edible oils with different fatty-acid compositions were determined for oils incubated at 180 °C up to 40 h. The oil degradation was evaluated by the dielectric dispersion and dielectric loss in the frequency range from 40 Hz to 2 MHz at 25 °C, refractive index, density, saponification number, and specific absorption coefficient at 232 and 268 nm. The dependence of the dielectric properties on frequency has been evaluated with Corach, Cole–Cole, and the universal power law models, giving the novel strategies for the interpretation of the dielectric spect

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Hoffer, A., A. Gelencsér, P. Guyon, et al. "Optical properties of humic-like substances (HULIS) in biomass-burning aerosols." Atmospheric Chemistry and Physics Discussions 5, no. 4 (2005): 7341–60. http://dx.doi.org/10.5194/acpd-5-7341-2005.

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Abstract. We present here the optical properties of humic-like substances (HULIS) isolated from the fine fraction of biomass burning aerosol collected in the Amazon basin during the LBA-SMOCC (Large scale Biosphere atmosphere experiment in Amazonia – SMOke aerosols, Clouds, rainfall and Climate) experiment in September 2002. From the isolated HULIS, aerosol particles were generated and their scattering and absorption coefficients measured. The size distribution and mass of the particles were also recorded. The value of the index of refraction was derived from "closure'' calculations based on p

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GUO, SHENG-LI, ZHUN GUO, T. SUSDORF, and TIAN-DE CAO. "ABSORPTION, EMISSION AND NONLINEAR SPECTROSCOPIC CHARACTERIZATION OF REACTIVE DYE." Journal of Nonlinear Optical Physics & Materials 15, no. 04 (2006): 481–90. http://dx.doi.org/10.1142/s0218863506003414.

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An optical spectroscopic characterization is carried out on a reactive dye (reactive orange 1). This dye is widely applied in textile coloration. It is a potential candidate for photonics applications. Its absorption cross-section spectra are measured. A fluorescence spectroscopic characterization is undertaken by measuring the fluorescence quantum distributions and fluorescence quantum yields. The saturable absorption is studied by nonlinear transmission measurements with intense picosecond laser pulses (second harmonic pulses of a mode-locked Nd :glass laser). The nonlinear optical absorptio

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Perov, D., A. Rinkevich, and O. Nemytova. "Microwave refraction coefficient in nanocomposites and nanostructures in magnetic field." Journal of Physics: Conference Series 1389 (November 2019): 012030. http://dx.doi.org/10.1088/1742-6596/1389/1/012030.

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Zarei-Ghanavati, Siamak, Marzieh Najjaran, Samira Hassanzadeh, Mehdi Khabazkhoob, Akilesh Gokul, and Mohammed Ziaei. "Agreement of a Pyramidal Wavefront-Based Autorefraction with Dry, Cycloplegic, and Subjective Refraction in Myopic Refractive Surgery Candidates." Journal of Current Ophthalmology 36, no. 1 (2024): 54–60. http://dx.doi.org/10.4103/joco.joco_261_23.

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Abstract Purpose: To evaluate the repeatability of a pyramidal wavefront-based refraction (WFR) measurement and its agreement with dry autorefraction (DR), cycloplegic autorefraction (CR), and subjective refraction (SR) in myopic refractive surgery candidates. Methods: One hundred eighty-nine eyes from 189 participants were evaluated. PERAMIS aberrometry (PERAMIS; SCHWIND eye-tech-solutions, Kleinostheim, Germany), DR, and CR, as well as SR, were completed for all candidates. The repeatability of PERAMIS measurements was assessed, and the Bland–Altman plots were used to test the agreement betw

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Hadi, Mahasin F., Eman Mohi Alwaan, and Wafaa Hameed Abass. "Nonlinear Optical Characteristics of Crystal VioletDye Doped Polystyrene Films by Using Z-Scan Technique." Al-Mustansiriyah Journal of Science 27, no. 5 (2017): 83. http://dx.doi.org/10.23851/mjs.v27i5.172.

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Z-scan technique was employed to study the nonlinear optical properties (nonlinear refractive index and nonlinear absorption coefficient) for crystal violet doped polystyrene films as a function of doping ratio in chloroform solvent. Samples exhibits in closed aperture Z-scan positive nonlinear refraction (self-focusing). While in the open aperture Z-scan gives reverse saturation absorption (RSA) (positive absorption) for all film with different doping ratio making samples candidates for optical limiting devices for protection of sensors and eyes from energetic laser light pulses under the exp

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ZHANG, XI, QUAN REN, WEN-FENG GUO, et al. "THIRD-ORDER NONLINEAR OPTICAL PROPERTIES OF [(C2H5)4N][Co(dmit)2] USING Z-SCAN TECHNIQUE." Modern Physics Letters B 22, no. 03 (2008): 191–98. http://dx.doi.org/10.1142/s0217984908014651.

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A novel dmit 2- complex: [( C 2 H 5)4 N][Co(dmit) 2], abbreviated as EtCo , was synthesized and its third-order optical nonlinearities were characterized by Z-scan technique at the wavelength of 1064 nm with laser duration of 40 ps. Z-scan curves revealed a negative nonlinear refraction at 1064 nm and a positive absorption was observed. The nonlinear refraction coefficient n2, the nonlinear absorption coefficient β and the molecular second hyperpolarizability γ have been determined to be as large as 9.51×10-19 m 2/ W , 2.19×10-12 m/W and 5.41×10-31 esu respectively, suggesting that this materi

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Hoffer, A., A. Gelencsér, P. Guyon, et al. "Optical properties of humic-like substances (HULIS) in biomass-burning aerosols." Atmospheric Chemistry and Physics 6, no. 11 (2006): 3563–70. http://dx.doi.org/10.5194/acp-6-3563-2006.

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Abstract. We present here the optical properties of humic-like substances (HULIS) isolated from the fine fraction of biomass-burning aerosol collected in the Amazon basin during the LBA-SMOCC (Large scale Biosphere atmosphere experiment in Amazonia – SMOke aerosols, Clouds, rainfall and Climate) experiment in September 2002. From the isolated HULIS, aerosol particles were generated and their scattering and absorption coefficients measured. The size distribution and mass of the particles were also recorded. The value of the index of refraction was derived from "closure" calculations based on pa

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49

Ramm, A. G. "An inverse problem for Helmholtz's equation." International Journal of Mathematics and Mathematical Sciences 10, no. 4 (1987): 825–27. http://dx.doi.org/10.1155/s0161171287000929.

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Sivkov, D. V., S. V. Nekipelov, O. V. Petrova, D. V. Bogachuk, R. N. Skandakov, and V. N. Sivkov. "Fullerite C₆₀ optical constants in the C 1s NEXAFS region." Journal of Physics: Conference Series 2103, no. 1 (2021): 012168. http://dx.doi.org/10.1088/1742-6596/2103/1/012168.

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Abstract Using data on the absorption cross sections the refraction coefficient spectral dependence n(E) and the spectra of the remaining optical coefficients (reflection coefficient, phase shift, and atomic form factor) in the fullerite C60 C 1s near edge X-ray absorption fine structure (NEXAFS) region (280–350 eV) were determined. For the n(E) calculations the Kramers-Kronig integral relations (KKRs) were used. The KKR computations were performed using data on atomic carbon absorption cross sections in the 10–30000 eV range and on solid and gaseous C60 – in the 0–120 eV. Absorption cross sec

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