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Artykuły w czasopismach na temat "Einstein’s coefficients"

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Griem, Hans. "Comment on ‘‘Quenching of Einstein’s A coefficients by photons’’." Physical Review Letters 66, no. 4 (1991): 521. http://dx.doi.org/10.1103/physrevlett.66.521.

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Escalante, José María, and Alejandro Martinez. "Theoretical study about the relations among coefficients of stimulated emission, spontaneous emission and absorption in indirect bandgap semiconductor." Physica B 411 (November 29, 2012): 52–55. https://doi.org/10.1016/j.physb.2012.11.024.

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We show a theoretical study that permits us to obtain the relationship between the coefficients of stimulated emission, spontaneous emission and absorption in indirect bandgap semiconductors,including multiphoton and multiphonon processes.
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Soni, Sagar V., and A. H. Hasmani. "A geometric study of Vaidya metric." Journal of Dynamical Systems and Geometric Theories 22, no. 1&2 (2024): 35–46. https://doi.org/10.47974/jdsgt-2023-002.

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Vaidya’s spacetime is the simplest non-static generalization of Schwarzschild’s solution to Einstein’s field equation. Vaidya metric represents radiating universe. With the aid of differential forms, various geometrical quantities related to Vaidya metric are obtained. We obtained the electrical parts of the Weyl tensor, it is found that they are related to the radial vector. We explored kinematic parameters in the terms of Ricci rotation coefficients. Also, we investigate behavior of general observer quantities at naked singularity r = 0.
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Lalneihpuii, R., and Raj Kumar Mishra. "Transport and Surface Properties of Liquid Metals using their Diffusion Data." Science & Technology Journal 4, no. 2 (2016): 137–40. http://dx.doi.org/10.22232/stj.2016.04.02.08.

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The atomic diffusion in liquid Na, K, Cs, Mg, Al, In and Pb have been evaluated from the well-known Einstein’s formula of self-diffusion coefficient, D  D  kBT ⎞ under square well (SW) interaction. The friction coefficient, ( of liquid    ⎝ ⎠ metals has been computed on the basis of Helfand-Rice-Nachtrieb approach under Helfand’s linear trajectory (LT) approximation. Shear viscosity of liquid metals were determined using modified Stokes-Einstein equation for SW potential. Dzugutov’s scaling was modified for SW interaction and has been employed to compute excess entropy of the considered l
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Lavenda, B. H. "On the Law of Equipartition for Translational Motion of Excited Molecules in Equilibrium with Thermal Radiation." Zeitschrift für Naturforschung A 44, no. 4 (1989): 273–77. http://dx.doi.org/10.1515/zna-1989-0404.

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Abstract Einstein’s radiation theory consists of two parts: the derivation of Planck's radiation law from a physical mechanism of absorption and emission of radiation by excited molecules that are in thermal equilibrium with the radiation field and a demonstration of the validity of the law of equipartition of energy for the translational motion of the molecules. Several incongruities are observed: Einstein could not have legitimately substituted back into his dynamical equilibrium condition, valid at any finite temperature, a limiting condition between the coefficients of absorption and stimu
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Chaudhary, U., and G. C. Kaphle. "Molecular Dynamics Study of Peptide in Water at Different Temperature." Journal of Nepal Physical Society 9, no. 1 (2023): 83–91. http://dx.doi.org/10.3126/jnphyssoc.v9i1.57601.

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Molecular dynamics approach has been carried out to study the structural properties of peptide to estimate the self-diffusion coefficients of water at different temperatures 290 K, 300 K, and 310 K respectively. The energy profiles show the stability of system which ensures a well-balanced molecular structure of the system. The radial distribution functions (RDFs) of the solvent-solvent, solute-solute, and solute-solvent show the distribution of system within the required references. The self-diffusion coefficients of water have been determined using respective mean square displacement (MSD) c
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Taylor, G. W. "The use of Einstein’s coefficients to predict the theory of operation of a semiconductor laser." Journal of Applied Physics 68, no. 7 (1990): 3122–39. http://dx.doi.org/10.1063/1.346407.

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Bilyk, Stepan A., Vladimir A. Tverskoy, Alexander V. Chernyak, Irina A. Avilova, Nikita A. Slesarenko, and Vitaly I. Volkov. "Water Molecules’ and Lithium Cations’ Mobility in Sulfonated Polystyrene Studied by Nuclear Magnetic Resonance." Membranes 13, no. 8 (2023): 725. http://dx.doi.org/10.3390/membranes13080725.

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The hydration of ions and charge groups controls electro mass transfer through ion exchange systems. The self-diffusion and local mobility of water molecules as well as lithium cations in poly (4-styrenesulfonic acid) and its lithium, sodium and cesium salts were investigated for the first time using pulsed-field gradient NMR (PFG NMR) and NMR relaxation techniques. The temperature dependences of the water molecule and Li+ cation self-diffusion coefficients exhibited increasing self-diffusion activation energy in temperature regions below 0 °C, which is not due to the freezing of parts of the
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Johnson, Erik, Sergei Prokofjev, Victor Zhilin, and Ulrich Dahmen. "Diffusional behavior of nanoscale lead inclusions in crystalline aluminum." International Journal of Materials Research 96, no. 10 (2005): 1171–80. http://dx.doi.org/10.1515/ijmr-2005-0202.

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Abstract In-situ transmission electron microscopy (TEM) observations reveal a permanent chaotic motion of nanosized liquid Pb inclusions embedded in thin aluminum foils. Individual trajectories of the inclusions were analysed to determine the character of their motion. The inclusions moving freely inside a crystal display motion with three-dimensional random walk characteristics while inclusions attached to dislocations display spatially confined random motion localized to the close vicinity of the dislocation lines. The diffusion coefficients of inclusions moving freely in the matrix were det
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Ngari, Adamu Z., Y. H. Ngadda, and D. I. Malgwi. "Application of a New Mass-Energy Concept in the Computation of Atomic Nuclear Masses." Nigerian Journal of Physics 32, no. 4 (2024): 192–96. http://dx.doi.org/10.62292/njp.v32i4.2023.129.

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In most literatures and scientific extrapolations, the Bethe-Weizsacker’s mass formula is dependent on Einstein’s relativistic mass-energy theory for calculations of nuclear masses, but the relativistic energy converting factor (speed of light) is only attributed to massless particle. Therefore, the method employed involves the conversion of the binding energy fitting coefficients by krane from mega electron volt to unified atomic mass unit (u) using Einstein relativistic mass-energy theory, Bahjat mass-energy relation and our new mass-energy concept. A close correlation can be observed betwee
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Rozprawy doktorskie na temat "Einstein’s coefficients"

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Chenyakin, Yuri. "Are diffusion coefficients calculated using the Stokes-Einstein equation combined with viscosities consistent with measured diffusion coefficients of tracer organics within organics-water mediums?" Thesis, University of British Columbia, 2015. http://hdl.handle.net/2429/54006.

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Recently, rates of molecular diffusion of organic species within organic-water particles of atmospheric relevance have become an area of intense research. This is because molecular diffusion rates are required for predicting rates of growth and reactivity of organic-water particles in the atmosphere. Due to the shortage of information on the topic, fluorescence recovery after photobleaching (FRAP) was used to measure the diffusion coefficients of three organic tracer dyes in sucrose-water aqueous solutions that serve as proxies for organic-water particles in the atmosphere. Organic tracer dyes
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Poole, Owen John. "A Monte Carlo simulation of percolation diffusion above the threshold in disordered lattices." Thesis, University of Portsmouth, 1996. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.310385.

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Gutierrez, Emmanuel David Mercado. "Thermal expansion coefficient for a trapped Bose gas during phase transition." Universidade de São Paulo, 2016. http://www.teses.usp.br/teses/disponiveis/76/76132/tde-27102016-102903/.

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Ultra cold quantum gas is a convenient system to study fundamental questions of modern physics, such as phase transitions and critical phenomena. This master thesis is devoted to experimental investigation of the thermodynamics susceptibilities, such as the isothermal compressibility and the thermal expansion coefficient of a trapped Bose-Einstein condensate (BEC) of 87Rb atoms. The critical phenomena and the critical exponents across the transition can explain the behavior of the isothermal compressibility and the thermal expansion coefficient near the critical temperature TC. By employing th
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Fusco, Giuseppe. "Righe spettrali formazione, shift e allargamento." Bachelor's thesis, Alma Mater Studiorum - Università di Bologna, 2017. http://amslaurea.unibo.it/14061/.

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Le righe spettrali sia esse in emissione che in assorbimento sono le impronte digitali della materia che compone l’universo, per questo in Astrofisica sono di importanza capitale. Dalle righe spettrali ricaviamo informazioni come la composizione delle zone che osserviamo, l’abbondanza degli elementi che le compongono e la velocit ́a con cui gli oggetti si allontanano o si avvicinano. Scopo di questo elaborato è dare un’introduzione al lettore di quello che è il fenomeno della formazione e modifica delle righe spettrali. Una riga spettrale si forma quando la radiazione interagisce con la materi
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Iarrera, Stefano. "Righe spettrali: formazione, shift, allargamento." Bachelor's thesis, Alma Mater Studiorum - Università di Bologna, 2018. http://amslaurea.unibo.it/15780/.

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Tutti gli oggetti astronomici osservabili da Terra, emettono della radiazione che viene riprocessata diverse volte prima di essere catturata da chi la sta osservando. Essa può attraversare zone con caratteristiche Fisiche diverse, ma ogni volta che ciò accade la radiazione subisce delle modifiche nella sua natura, in particolare avviene la formazione di quelle che vengono definite "righe spettrali". Nel campo dell'astrofisica le righe spettrali assumono un ruolo fondamentale: grazie ad esse siamo in grado di derivare, dall'osservazione di una sorgente, una quantità di informazioni davvero im
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Minelli, Alice. "Righe spettrali: formazione, shift ed allargamento." Bachelor's thesis, Alma Mater Studiorum - Università di Bologna, 2016. http://amslaurea.unibo.it/11450/.

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In questo breve elaborato si vuole spiegare l’importanza dello studio di un corpo celeste mediante l’osservazione del suo spettro ovvero un grafico del flusso emesso in funzione della frequenza o della lunghezza d’onda nel quale sono presenti righe spettrali, formate dall’interazione tra materia e radiazione, a causa dell’assorbimento od emissione di fotoni a seguito di transizioni elettroniche, ma anche vibrazionali e rotazionali per le molecole. In particolare, dall’analisi delle righe spettrali si traggono diverse informazioni sull’oggetto, quali, la composizione e l’abbondanza delle specie
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Zago, Massimiliano. "Righe spettrali: formazione, shift, allargamento." Bachelor's thesis, Alma Mater Studiorum - Università di Bologna, 2020. http://amslaurea.unibo.it/21216/.

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La quasi totalità delle informazioni che possiamo ricavare da un determinato oggetto celeste lo dobbiamo all'analisi della radiazione elettromagnetica che quest'ultimo emette o assorbe, infatti, a volte, è proprio ciò che non vediamo che ci dà informazioni sull'oggetto in questione. Un oggetto può produrre radiazione elettromagnetica in due differenti modi; può infatti emettere ad ogni lunghezza d'onda, e in questo caso parleremo di processi d'emissione del continuo, o può emettere interessando lunghezze d'onda specifiche dello spettro elettromagnetico, e in questo caso parleremo di proce
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Liberatori, Alessio. "L'atomo di idrogeno: righe, serie e sua importanza in astrofisica." Bachelor's thesis, Alma Mater Studiorum - Università di Bologna, 2020. http://amslaurea.unibo.it/21225/.

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L’atomo di idrogeno è l’elemento chimico più abbondante e semplice nell’Universo. Esso riveste un ruolo fondamentale in Astrofisica poiché compone circa il 74% della materia barionica. Dai primi passi mossi da Balmer nella spettroscopia all’atomo di idrogeno in meccanica quantistica, passando per il modello atomico di Bohr, questo elaborato descrive brevemente l’evoluzione del ruolo centrale dell’atomo di idrogeno e la conseguente evoluzione della fisica atta a descriverlo negli ultimi due secoli di storia. Successivamente vengono descritti analiticamente i fenomeni alla base dei principali pr
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Mercier-Depuydt, Eliane. "Contribution a l'etude des collisions ion-atome a basse energie : un modele semi-diabatique pour les courbes de potentiel des ions moleculaires arh**(+*) et hene**(+*)." Paris 6, 1987. http://www.theses.fr/1987PA066522.

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Proposition d'un modele semi-adiabatique pour les ions dissymetriques excitess, formes d'un "coeur" adiabatique et d'un electron externe (de type h::(2)**(+)) en vue de calculs ab initio precis et de la determination des courbes de potentiel necessaires a l'interpretation des collisions a basse energie. Applicaion a arh**(+*): calcul des courbes de potentiel quasidiabatiques pour r = 1,7 - 7 ua; etude du seuil de la reaction ar**(+) + h -> ar**(+) + h (n=2). Application a hene**(+*). Interpretation des oscillations de rosenthal observees dans la section efficace totale d'excitation; calcul des
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Li, Jun 1977. "A computational model for the diffusion coefficients of DNA with applications." Thesis, 2010. http://hdl.handle.net/2152/ETD-UT-2010-05-1098.

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The sequence-dependent curvature and flexibility of DNA is critical for many biochemically important processes. However, few experimental methods are available for directly probing these properties at the base-pair level. One promising way to predict these properties as a function of sequence is to model DNA with a set of base-pair parameters that describe the local stacking of the different possible base-pair step combinations. In this dissertation research, we develop and study a computational model for predicting the diffusion coefficients of short, relatively rigid DNA fragments from th
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Książki na temat "Einstein’s coefficients"

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Chance, Kelly, and Randall V. Martin. Spectroscopy Fundamentals. Oxford University Press, 2017. http://dx.doi.org/10.1093/oso/9780199662104.003.0005.

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This chapter provides a broad overview of the spectroscopic principles required in order to perform quantitative spectroscopy of atmospheres. It couples the details of atmospheric spectroscopy with the radiative transfer processes and also with the assessment of rotational, vibrational, and electronic spectroscopic measurements of atmospheres. The principles apply from line-resolved measurements (chiefly microwave through infrared) through ultraviolet and visible measurements employing absorption cross sections developed from individual transitions. The chapter introduces Einstein coefficients
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Allen, Michael P., and Dominic J. Tildesley. How to analyse the results. Oxford University Press, 2017. http://dx.doi.org/10.1093/oso/9780198803195.003.0008.

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In this chapter, practical guidance is given on the calculation of thermodynamic, structural, and dynamical quantities from simulation trajectories. Program examples are provided to illustrate the calculation of the radial distribution function and a time correlation function using the direct and fast Fourier transform methods. There is a detailed discussion of the calculation of statistical errors through the statistical inefficiency. The estimation of the error in equilibrium averages, fluctuations and in time correlation functions is discussed. The correction of thermodynamic averages to ne
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Części książek na temat "Einstein’s coefficients"

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Stenzel, Olaf. "Einstein Coefficients." In Springer Series in Surface Sciences. Springer International Publishing, 2024. http://dx.doi.org/10.1007/978-3-031-65030-7_10.

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Stenzel, Olaf. "Einstein CoefficientsEinstein’s Coefficients." In Springer Series in Surface Sciences. Springer International Publishing, 2015. http://dx.doi.org/10.1007/978-3-319-21602-7_10.

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Thyagarajan, K., and Ajoy Ghatak. "Einstein Coefficients and Light Amplification." In Lasers. Springer US, 2010. http://dx.doi.org/10.1007/978-1-4419-6442-7_4.

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Stenzel, Olaf. "Planck’s Formula and Einstein Coefficients." In UNITEXT for Physics. Springer International Publishing, 2022. http://dx.doi.org/10.1007/978-3-030-87144-4_7.

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Stenzel, Olaf. "Einstein Coefficients and Quantum Transitions." In UNITEXT for Physics. Springer International Publishing, 2022. http://dx.doi.org/10.1007/978-3-030-87144-4_6.

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Dodd, John N. "The Einstein A and B Coefficients." In Atoms and Light: Interactions. Springer US, 1991. http://dx.doi.org/10.1007/978-1-4757-9331-4_8.

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Renk, Karl F. "Basis of the Theory of the Laser: The Einstein Coefficients." In Basics of Laser Physics. Springer Berlin Heidelberg, 2011. http://dx.doi.org/10.1007/978-3-642-23565-8_6.

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Renk, Karl F. "Basis of the Theory of the Laser: The Einstein Coefficients." In Basics of Laser Physics. Springer International Publishing, 2017. http://dx.doi.org/10.1007/978-3-319-50651-7_6.

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Ghatak, Ajoy, and S. Lokanathan. "The Semi-Classical Theory of Radiation and the Einstein Coefficients." In Quantum Mechanics: Theory and Applications. Springer Netherlands, 2004. http://dx.doi.org/10.1007/978-1-4020-2130-5_26.

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Ivanova, E. V. "On Calculating Einstein Coefficients for Time–Periodic Systems. Integral of Motion Method." In Group Theoretical Methods in Physics. Volume II. CRC Press, 2024. http://dx.doi.org/10.1201/9781003580850-49.

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Streszczenia konferencji na temat "Einstein’s coefficients"

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Andrade, C., M. A. Sanjuán, and C. Alonso. "Measurement of Chloride Diffusion Coefficient from Migration Tests." In CORROSION 1993. NACE International, 1993. https://doi.org/10.5006/c1993-93319.

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Abstract A critical review is offered on the Rapid Chloride Permeability Test standarized by AASHTO, pointing out its limitations and errors but recognizing its contribution to the developing of a simple and quick test for chloride migration. Then another review is made on the electrochemical fundaments of the processes developped in concrete when an electrical field is applied and on the basic equations of mass transport (Nernst-Plank and Nernst-Einstein) which can be applied to calculate ionic movements. The limitations and assumptions needed for a simplified resolution of these equations, a
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Andrade, C., C. Alonso, M. Acha, and M. Castellote. "Experimental Comparison between Chloride Diffusion and Migration Tests in Steady-State Condition." In CORROSION 1996. NACE International, 1996. https://doi.org/10.5006/c1996-96332.

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Abstract Previous papers have been published with theoretical attempts to improve the so called "Rapid Chloride Permeability Test" and how to convert it to a reliable method for calculating chloride diffusion coefficients. The approach was based on considering the fundamentals of electrochemistry for ionic transport in electrolytes by the use of Nernst-Plank and Nernst-Einstein equations. In the present paper experimental details are given in order to compare natural diffusion and migration tests. The results indicate reasonable agreement between both test types and the soundness of the simpli
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O’Toole, Stephen, and Nicholas Stevens. "High Temperature Diffusion of Oxygen in Chromite." In ASME 2006 Pressure Vessels and Piping/ICPVT-11 Conference. ASMEDC, 2006. http://dx.doi.org/10.1115/pvp2006-icpvt-11-93582.

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Molecular dynamics was used to calculate the diffusion coefficient of oxygen over a temperature range of 900–1700K. The chromite (FeCr2O4) system used consisted of 448 ions in a spinel structure. The spinel consisted of Fe2+ in tetrahedral sites and Cr3+ ions in octahedral sites surrounded by O2− ions. Schottky defects were made in the system by removing 10 oxygen ions, 4 iron ions and 4 chromium ions. The trajectory files from the simulations were examined for oxygen movement via a vacancy hopping mechanism and the mean-squared displacement of oxygen was plotted against time. A linear fit was
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VIDEV, VESELIN. "CHARACTERIZATION OF FOUR-DIMENSIONAL EINSTEIN RIEMANNIAN MANIFOLDS USING CHARACTERISTICAL COEFFICIENTS OF JACOBI OPERATOR." In INTERNATIONAL SCIENTIFIC CONFERENCE MATHTECH 2024. Konstantin Preslavsky University Press, 2024. https://doi.org/10.46687/qttb4042.

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Chung, Y., H. Hirose, and S. Suckewer. "Measurement of the Quenching of Spontaneous Emission Coefficients in Laser-Produced Plasmas." In Short Wavelength Coherent Radiation: Generation and Applications. Optica Publishing Group, 1988. http://dx.doi.org/10.1364/swcr.1988.soa402.

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Al-Refaie, Ahmed, Jonathan Tennyson, and Sergei Yurchenko. "GPU ACCELERATED INTENSITIES: A NEW METHOD OF COMPUTING EINSTEIN-A COEFFICIENTS." In 70th International Symposium on Molecular Spectroscopy. University of Illinois at Urbana-Champaign, 2015. http://dx.doi.org/10.15278/isms.2015.mh04.

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Cao, H., D. DiCicco, and S. Suckewer. "Change of ions’ spontaneous emission by an intense laser beam." In OSA Annual Meeting. Optica Publishing Group, 1993. http://dx.doi.org/10.1364/oam.1993.ws.6.

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For atomic systems under strong influence of electromagnetic fields, the values of Einstein A and B coefficients have been observed to change from those of isolated atoms. However in our previous experiments which demonstrated the changes of A-coefficients, the self absorption of spontaneous emission was very strong and might the experimental result. In order to reduce the absorption drastically so that its effect can be neglected, we conducted a new experiment. In our new experiment, we measured the spontaneous emission from a very short discharge tube where the absorption was less than 4%. W
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Swer, S., A. Syiemiong, M. Ram, A. K. Jha, and A. Saxena. "Einstein coefficients and oscillator strengths for low lying state of CO molecules." In 9TH NATIONAL CONFERENCE ON THERMOPHYSICAL PROPERTIES (NCTP-2017). Author(s), 2018. http://dx.doi.org/10.1063/1.5031731.

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Eckstein, Eugene C., and Mark Leggas. "First Passage Measurements of Dispersion Coefficients for Suspension Flows." In ASME 1999 International Mechanical Engineering Congress and Exposition. American Society of Mechanical Engineers, 1999. http://dx.doi.org/10.1115/imece1999-0375.

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Abstract We report results of an experimental protocol for determining effective diffusion coefficients in suspension flows in thin channels. The method is based on the first-passage method (FPM), a well-known aspect of probability theory. Images of identifiable individual particles are collected at a regular rate by a video camera. The times needed for individual particles to move selected distances on either side of the original position are measured. Such events are individually the “first passage” for the selected net distances. Repeated evaluation of this statistic for the same initial co
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Noppe, Michael G. "On Einstein spectral coefficients and effect of gain dependence on energy density in semiconductor laser." In 2008 9th International Scientific-Technical Conference on Actual Problems of Electronic Instrument Engineering (APEIE). IEEE, 2008. http://dx.doi.org/10.1109/apeie.2008.4897065.

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Raporty organizacyjne na temat "Einstein’s coefficients"

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Aumayr, F., J. Hung, and S. Suckewer. Quenching of Einstein's A-coefficients by photons. Office of Scientific and Technical Information (OSTI), 1989. http://dx.doi.org/10.2172/6199146.

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Aumayr, F., W. Lee, C. H. Skinner, and S. Suckewer. Quenching of Einstein-coefficients by photons. Office of Scientific and Technical Information (OSTI), 1991. http://dx.doi.org/10.2172/6100640.

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Suckewer, S. Quenching of Einstein A-Coefficients in plasmas and lasers. Office of Scientific and Technical Information (OSTI), 1991. http://dx.doi.org/10.2172/6054566.

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