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Littérature scientifique sur le sujet « Density fluctuation »

Auteur : Grafiati

Publié le 21 avril 2023

Mis à jour le 18 mai 2024

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Articles de revues sur le sujet "Density fluctuation"

Artemenko, S. N. « Modification of charge density wave fluctuations by charge perturbations ». Journal de Physique IV 12, n^o 9 (novembre 2002) : 77–78. http://dx.doi.org/10.1051/jp4:20020359.

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Spectral density of fluctuations of the CDW phase are calculated taking into account electric field induced by phase fluctuations. The approach based upon the fluctuation-dissipation theorem (FDT) combined with equations of linear response of the CDW conductor is used. Fluctuating electric field is found to suppress fluctuations of the phase, while fluctuations of the electric potential are sizeable. This suggests that transition from the CDW to the normal state (which is usually observed well below the mean-field transition temperature) may he provoked by fluctuations of the chemical potential, rather than by destruction of the CDW coherence between conducting chains due to phase fluctuations.

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Koga, Y. « Fluctuations in aqueous methanol, ethanol, and propan-1-ol : amplitude and wavelength of fluctuation ». Canadian Journal of Chemistry 77, n^o 12 (5 décembre 1999) : 2039–45. http://dx.doi.org/10.1139/v99-213.

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Density, heat capacity, and isentropic compressibility data for aqueous methanol, ethanol, and propan-1-ol by Benson's group were used to evaluate two kinds of fluctuations; mean-square fluctuation densities; and (mean-square) normalized fluctuations, respectively, in volume, entropy, and cross (entropy/volume) effect. The mean-square fluctuation densitiesprovide measures for the amplitude (intensity) of the fluctuation, while the normalized fluctuations contain information regarding the wavelength (extensity) of the fluctuation. Furthermore, their composition derivatives, the partial molar fluctuationsof alcohols were calculated. These quantities signify the effect of additional solute on the respective fluctuations. These data were interpreted in terms of mixing schemes learned earlier in this laboratory by using the data of excess partial molar enthalpy, entropy, and volume, and the respective alcohol-alcohol interaction functions, i.e., the composition derivatives of partial molar quantities. Key words: aqueous methanol, ethanol, and propan-1-ol;fluctuation density; normalized fluctuation; partial molar fluctuations of alcohol.

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Laberge, Gaetan J. H., et Rizwan U. Haq. « "Universality" of Gaussian orthogonal ensemble fluctuations : the two-body random ensemble and shell model spectra ». Canadian Journal of Physics 68, n^o 3 (1 mars 1990) : 301–12. http://dx.doi.org/10.1139/p90-048.

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Starting from an appropriate decomposition of the level density into an average and fluctuating part, we studied the energy level fluctuations of an ensemble defined by two-body random Hamiltonians. A detailed analysis of several spectrally averaged fluctuation measures shows close agreement with the predictions of the Gaussian orthogonal ensemble (GOE). This confirms earlier indications that, except for noninteracting particles, fluctuation measures are insensitive to the rank of the interaction. Further, analysis of spectra obtained from realistic nuclear interactions agrees well with the GOE indicating that specific properties of the Hamiltonian have little or no influence on fluctuations. These results, therefore, strengthen our belief in the "universality" of GOE fluctuations.

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KOIKE, MASAFUMI, et JOE SATO. « EFFECTS OF MATTER DENSITY FLUCTUATION IN LONG BASELINE NEUTRINO OSCILLATION EXPERIMENTS ». Modern Physics Letters A 14, n^o 19 (21 juin 1999) : 1297–302. http://dx.doi.org/10.1142/s0217732399001383.

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The effects of matter density fluctuation in long baseline neutrino oscillation experiments are studied. Effects of short wavelength fluctuations are irrelevant. Effects of long wavelength fluctuations must be checked on a case-by-case basis. As an example we checked the fluctuation effects and showed its irrelevance in a case of K2K experiments.

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Heidbrink, W. W. « Beam density fluctuation diagnostic ». Review of Scientific Instruments 59, n^o 9 (septembre 1988) : 2008–11. http://dx.doi.org/10.1063/1.1140067.

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LAYEK, BISWANATH, SOMA SANYAL et AJIT M. SRIVASTAVA. « BARYOGENESIS VIA DENSITY FLUCTUATIONS WITH A SECOND ORDER ELECTROWEAK PHASE TRANSITION ». International Journal of Modern Physics A 18, n^o 26 (20 octobre 2003) : 4851–68. http://dx.doi.org/10.1142/s0217751x03015799.

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We consider the presence of cosmic string induced density fluctuations in the universe at temperatures below the electroweak phase transition temperature. Resulting temperature fluctuations can restore the electroweak symmetry locally, depending on the amplitude of fluctuations and the background temperature. The symmetry will be spontaneously broken again in a given fluctuation region as the temperature drops there (for fluctuations with length scales smaller than the horizon), resulting in the production of baryon asymmetry. The time scale of the transition will be governed by the wavelength of fluctuation and, hence, can be much smaller than the Hubble time. This leads to strong enhancement in the production of baryon asymmetry for a second order electroweak phase transition as compared to the case when transition happens due to the cooling of the universe via expansion. For a two-Higgs extension of the Standard Model (with appropriate CP violation), we show that one can get the required baryon to entropy ratio if fluctuations propagate without getting significantly damped. If fluctuations are damped rapidly, then a volume factor suppresses the baryon production. Still, the short scale of the fluctuation leads to enhancement of the baryon to entropy ratio by at least 3–4 orders of magnitude compared to the conventional case of second order transition where the cooling happens due to expansion of the universe.

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Singh, Rajeev. « Quantum fluctuations of baryon number density ». Journal of Physics : Conference Series 2105, n^o 1 (1 novembre 2021) : 012006. http://dx.doi.org/10.1088/1742-6596/2105/1/012006.

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Abstract Quantum fluctuation expression of the baryon number for a subsystem consisting of hot relativistic spin− 1 2 particles are derived. These fluctuations seems to diverge in the limit where system size goes to zero. For a broad range of thermodynamic parameters numerical solutions are obtained which might be helpful to interpret the heavy-ion experimental data.

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Bai, Yujoung, Chang-Mo Ryu, Chul Koo Kim, Sang Koo You et Kyun Nahm. « Spin-density fluctuation in paramagnets ». Physical Review B 54, n^o 1 (1 juillet 1996) : 33–36. http://dx.doi.org/10.1103/physrevb.54.33.

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Azzazy, M., D. Modarress et T. Hoeft. « High-sensitivity density fluctuation detector ». Journal of Physics E : Scientific Instruments 20, n^o 4 (avril 1987) : 428–31. http://dx.doi.org/10.1088/0022-3735/20/4/017.

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MOSTOVOY, MAXIM, et JASPER KNOESTER. « INSTANTON CALCULATION OF THE DENSITY OF STATES OF DISORDERED PEIERLS CHAINS ». International Journal of Modern Physics B 13, n^o 13 (30 mai 1999) : 1601–18. http://dx.doi.org/10.1142/s0217979299001594.

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We use the optimal fluctuation method to find the density of electron states inside the pseudogap in disordered Peierls chains. The electrons are described by the one-dimensional Dirac Hamiltonian with randomly varying mass (the Fluctuating Gap Model). We establish a relation between the disorder average in this model and the quantum-mechanical average for a certain double-well problem. We show that the optimal disorder fluctuation, which has the form of a soliton–antisoliton pair, corresponds to the instanton trajectory in the double-well problem. We use the instanton method developed for the double-well problem to find the contribution to the density of states from disorder realizations close to the optimal fluctuation.

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Thèses sur le sujet "Density fluctuation"

Côté, Alain C. « Density fluctuation measurements with laser scattering ». Thesis, University of Oxford, 1989. http://ora.ox.ac.uk/objects/uuid:2580d8c1-32f7-40c6-afe1-14ebde9641f3.

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-2 power law. The average phase velocities are around 4.5 km/sec and are slightly larger than the electron diamagnetic drift velocity. The waves are tentatively identified with the electron drift mode. Coherent signals due to long wavelength MHD modes are detected. Results from a Langmuir probe corroborate most of these data.

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Mali, Provash. « Density fluctuation and correlation study of multiperticles production in 28Si-Ag/Br interaction at 14.5A GeV ». Thesis, University of North Bengal, 2016. http://hdl.handle.net/123456789/2757.

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Colonna, Nicola. « Exchange and correlation energy in the adiabatic connection fluctuation-dissipation theory beyond RPA ». Doctoral thesis, SISSA, 2014. http://hdl.handle.net/20.500.11767/3863.

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Density functional theory (DFT) within standard local density/generalized gradient approximations (LDA/GGAs) have been proved to succesfully predict the properties of a wide class of electronic systems at a reasonable computational time. However there exist a number of situations in wich DFT within LDA/GGAs qualitatively fails. One of such problems is their inability, due their intrinsic local nature, to describe long-range interaction between non overlapping molecular fragments, or weakly bound systems such as molecules about to break during a chemical reaction. The Adiabatic Connection Fluctuation Dissipation (ACFD) formalism tackle this kind of problems at a very foundamental level providing a perfect starting point for the development of truly non-local functionals. We have indeed developed and implemented an efficient scheme for the calculation of the correlation energy via the ACFD theorem going beyond the random phase approximation (RPA) by including the exact-exchange contribution to the kernel. We found that this contribution plays a crucial role for a correct and accurate description of the total energy of an electronic system without compromising the achivements of the original RPA functional.

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Xu, Peng Ph D. Massachusetts Institute of Technology. « Polarimetry measurements of current density profile and fluctuation changes during lower hybrid experiments on Alcator C-Mod ». Thesis, Massachusetts Institute of Technology, 2013. http://hdl.handle.net/1721.1/84391.

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Thesis (Ph. D.)--Massachusetts Institute of Technology, Dept. of Physics, September 2013.
Cataloged from PDF version of thesis.
Includes bibliographical references (pages 179-186).
As a possible method to achieve steady-state plasma operation in a tokamak fusion reactor, Lower Hybrid Current Drive (LHCD) has been extensively studied on Alcator C-Mod. The measurement of current density profiles (or poloidal magnetic field or safety factor) is essential to the understanding of the LH physics. A polarimeter measures the line-integral of the electron density times the magnetic field parallel to a chord through the plasma, and is capable of deriving the current density profile with multi-chord measurements. A three-chord poloidally viewing far-infrared (FIR) polarimeter has therefore been developed for C-Mod. FIR optics, FIR detectors, electronics and mechanical components were custom designed and fabricated. Various sources of vibrations and systematic errors have been carefully dealt with. A synthetic polarimeter signal has been derived from density profiles from Thomson scattering and magnetic field profiles from EFIT. The polarimeter results confirm that the magnetic field profiles from Kinetic EFIT (with Motional Stark Effect and plasma pressure constraints) is much more accurate than those from normal EFIT (no internal constraints, central safety factor qo~0.9 5) during the LHCD. The polarimeter data were used to constrain qO, and the result shows that the current density profile is flattened, and qo increases to ~2 with strong LHCD. Experiments during LHCD with a plasma density scan, a current scan, and LH power and phase scans have been carried out. The Polarimetry observations confirm the off-axis current drive, and strongly decreasing driven current when the density exceeds a limit of about 1.Ox 102 0/m3 . They also indicate that the driven current is closer to the plasma edge for Ip ~820 kA than for I, ~580 kA, and that lower LH phasing is preferred for higher current drive efficiency. The polarimeter is the first diagnostic to measure core magnetic fluctuations in Alcator C-Mod. These include broadband magnetic fluctuations during EDA H-modes that are suppressed with the application of LH power.
by Peng Xu.
Ph.D.

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Soula, Serge. « Influence de l'effet couronne sur le champ electrique mesure au voisinage du sol sous orage ». Toulouse 3, 1986. http://www.theses.fr/1986TOU30213.

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Generalites sur l'electricite des orages. Mise au point d'un appareil de type gardien pour mesurer la densite ionique. Resultats experimentaux obtenus durant deux campagnes: ils concernent d'une part les mesures de champ electrique a plusieurs hauteurs dans les domaines des variations lentes et rapides, d'autre part celles de la densite ionique. Theorie du courant de maxwell sour l'orage. Simulation de l'evolution des divers parametres electriques venant confirmer les resultats experimentaux.

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El, Dib Georges. « Fibres optiques en verre de borophosphate de niobium pour des applications en optique non linéaire ». Electronic Thesis or Diss., Limoges, 2023. http://www.theses.fr/2023LIMO0004.

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Les principaux objectifs de cette thèse étaient de développer des fibres optiques de borophosphate riche en niobium avec une qualité optique améliorée ainsi que de tirer profit de leur haute non linéarité pour des applications comme dispositifs de guides d'ondes dans le proche infrarouge. Les travaux exposés dans cette thèse traitent d’aspects théoriques et pratiques en science des verres. Ils s’articulent autour du système vitreux borophosphate riche en niobium : (100-x) [(0,95 NaPO3 + 0,05 Na2B4O7)] - x Nb2O5 ; avec x le taux (mol %) de Nb2O5 dans le verre. Dans un premier temps, une étude détaillée portant sur les propriétés thermiques, rhéologiques et sur l’étirage des préformes a été réalisée. Grâce à cette étude une corrélation entre la composition et la capacité de fibrage des verres a pu être mise en évidence. La relation entre la méthode de synthèse du verre et les pertes optiques a ensuite été étudiée. Nous avons montré qu’une approche ne nécessitant pas la coulée du verre permet l’obtention de fibres avec des pertes significativement plus faibles. Dans un second temps, nous nous sommes intéressés à la haute non linéarité de ces verres. Nous avons démontré la faisabilité du traitement de polarisation thermique (poling) sur des fibres de sections rectangulaires pour la génération de seconde harmonique. D’autre part, les effets de propagation des impulsions laser intenses dans des fibres d’architectures cœur/gaine rectangulaire ont été explorés, montrant à terme la capacité de ces verres à générer des sources supercontinuum allant jusqu’a 2.5 µm
The main objectives of this thesis were to develop niobium-rich borophosphate optical glass fibers with improved optical quality and to take advantage of their high nonlinearity for their potential use as waveguide devices in the near infrared. The work presented in this thesis deals with theoretical and practical aspects of glass science. It is based on the niobium-rich borophosphate glass matrix : (100-x) [(0,95 NaPO3 + 0,05 Na2B4O7)] - x Nb2O5 ; where x is the Nb2O5 content (mol%) in the glass. First, a detailed study of the thermal/rheological properties and the drawing of the preforms has been performed. Thanks to this study, a correlation between the composition and the drawing ability of the glasses could be demonstrated. Then the relationship between the glass synthesis method and the optical losses has been studied. We have shown that a new approach eliminating the casting step allows to obtain fibers with significantly lower losses. In a second step, one is interested in exploiting the high nonlinearity of these glasses. We have demonstrated the feasibility of thermal poling treatment on fibers with rectangular cross sections for second harmonic generation. On the other hand, the effects of intense laser pulses propagation in fibers of rectangular core/cladding architectures were investigated, leading to show the ability of these glasses to generate supercontinuum sources up to 2.5 µm

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GALASSO, SARA. « Generalization of the Eliashberg equations and Density Functional Theory applied to the analysis of the fundamental properties of iron-based superconductors ». Doctoral thesis, Politecnico di Torino, 2015. http://hdl.handle.net/11583/2596360.

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Density Functional Theory (DFT) allows a fully ab-initio treatment of almost all the quantities that enter in the Eliashberg theory and in many other approaches used to study both the superconducting and the normal phase. A complete description from first principles of real materials is, al least in principle, possible. Here DFT and Eliashberg theory are applied to the study of some members of the new family of superconductors discovered in 2008, the iron-compounds. Superconductivity here is unconventional and unlikely mediated by phonons. When electronic mechanisms are involved and the properties of the compounds are more complex, as in the case of Fe-based superconductors, also the ab-initio treatment may require some reasonable ad hoc approximations, derived from experimental evidences or theoretical argumentations, introducing some phenomenological aspects in the formulation. In this thesis, Eliashberg theory and DFT are applied to study the properties of some iron compounds, in particular the properties of LiFeAs and Co-doped Ba-122 are discussed both in the normal and in the superconducting state. In order to unveil the the properties of the superconducting state, in particular the symmetry and the amplitude of the order parameter and the coupling mechanism, a four bands Eliashberg model is discussed for LiFeAs suggesting that the specific electronic structure of this peculiar compound may lead to the breakdown of the Migdal's theorem forcing the model to be phenomenological". The relation between the topology of the Fermi surface and the presence of nodes is studied in Point-contact Andreev-reflection spectra of Ba(Fe1-xCox)2As2 (both thin fims and single crystals) and Ca(Fe1-xCox)2As2. The curves presented are fitted within the multiband 3D-BTK model that allows the inclusion of the real shape of the Fermi surface evaluated within DFT. Thanks to the inclusion of the results obtained within the Eliashberg theory in the 2D-BTK model some additional structures due to the strong electron-boson interaction, that appear at energy higher than the amplitude of the gaps in some AR spectra, can be studied and some guesses about the nature of the superconducting mechanism can be made. This technique is here applied to the case of Ba(Fe1-xCox)2As2 thin films with x = 0.08. Finally, as concern the normal state, the temperature dependence of resistivity is reproduced both in LiFeAs and Ba(Fe1-xCox)2As2 with a model that contains two different kind of carriers. For both compounds spin fluctuations play an important role also in the normal state in addition to being the main bosons that mediate the Cooper pairing and in both compound the transport coupling constant results to be sensibly smaller than the superconducting one, suggesting a way to find a unifying principle for HTCS.

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Xie, Tao. « Hydrodynamic characteristics of gas/liquid/fiber three-phase flows based on objective and minimally-intrusive pressure fluctuation measurements ». Diss., Available online, Georgia Institute of Technology, 2004:, 2004. http://etd.gatech.edu/theses/available/etd-09192004-033703/unrestricted/xie%5Ftao%5F200412%5Fphd.pdf.

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Thesis (Ph. D.)--Mechanical Engineering, Georgia Institute of Technology, 2005.
D. William Tedder, Committee Member ; Minami Yoda, Committee Member ; Tom McDonough, Committee Member ; Andrei G. Fedorov, Committee Member ; S. Mostafa Ghiaasiaan, Committee Chair ; Seppo Karrila, Committee Member. Includes bibliographical references.

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Nguyen, Van Thinh. « Contribution à l'étude de la structure de la turbulence près d'une paroi lisse ». Paris 6, 1987. http://www.theses.fr/1987PA066553.

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Etude théorique des champs turbulents non homogènes. Etude de l'écoulement turbulent établi dans une conduite rectangulaire très allongée. Etude de la région au voisinage proche de la paroi. Etude expérimentale par anémométrie à fil chaud. Détermination des vitesses moyennes, fluctuations longitudinales de vitesse, densités spectrales et corrélations, densités de probabilité.

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Mahmoud, Ali. « Analyseur de spectre à haute résolution : Apllication à la mesure des oscillateurs ultrastables ». Besançon, 1989. http://www.theses.fr/1989BESA2004.

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Une methode de mesure par intercorrelation utilisant l'intercomparaison de trois oscillateurs deux a deux, permet de mesurer les fluctuations de phase ou de frequence des oscillateurs ultrastables. Nous presentons l'etude et la realisation d'un analyseur de spectre par correlation. Cet appareil permet d'analyser la fonction de correlation ou de calculer la densite spectrale de puissance du bruit de phase de l'oscillateur a mesurer

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Livres sur le sujet "Density fluctuation"

Center, Langley Research, dir. A real time dynamic data acquisition and processing system for velocity, density, and total temperature fluctuation measurements. Hampton, Va : National Aeronautics and Space Administration, Langley Research Center, 1991.

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Kolb, Edward W. Origin of density fluctuations in extended inflation. Batavia, Ill : Fermi National Accelerator Laboratory, 1990.

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Bowles, R. J. Density profiles and concentration fluctuations in liquid binary mixtures. Norwich : University of East Anglia, 1986.

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Haney, Robert L. Estimating subpycnocline density fluctuations in the California Current region from upper ocean observations. Monterey, Calif : Naval Postgraduate School, 1994.

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McCann, Edward. Mesoscopic fluctuations of the electronic density of states in disordered systems. Birmingham : University of Birmingham, 1996.

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United States. National Aeronautics and Space Administration., dir. Measurement of temperature and density fluctuations in turbulence using an ultraviolet laser. San Diego, CA : San Diego State University, 1986.

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L, McKenzie Robert, et Ames Research Center, dir. Measurements of density,temperature, and their fluctuations in turbulent supersonic flow using UV laser spectroscopy. Moffett Field, Calif : National Aeronautics and Space Administration, Ames Research Center, 1992.

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United States. National Aeronautics and Space Administration., dir. Quenching of the beam-plasma instability by 3-D spectra of large scale density fluctuations. Boulder, Colo : University of Colorado, 1985.

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L, McKenzie R., et Ames Research Center, dir. Measurements of density,temperature, and their fluctuations in turbulent supersonic flow using UV laser spectroscopy. Moffett Field, Calif : National Aeronautics and Space Administration, Ames Research Center, 1992.

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Chapitres de livres sur le sujet "Density fluctuation"

Niquet, Y. M., et M. Fuchs. « The Exchange-Correlation Potential in the Adiabatic-Connection Fluctuation-Dissipation Framework ». Dans Time-Dependent Density Functional Theory, 435–42. Berlin, Heidelberg : Springer Berlin Heidelberg, 2006. http://dx.doi.org/10.1007/3-540-35426-3_29.

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Gómez González, Rubén, et Vicente Garzó. « Kinetic Theory of Binary Granular Suspensions at Low Density. Thermal Diffusion Segregation ». Dans Nonequilibrium Thermodynamics and Fluctuation Kinetics, 173–89. Cham : Springer International Publishing, 2022. http://dx.doi.org/10.1007/978-3-031-04458-8_9.

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Balestrino, G., E. Milani et A. A. Varlamov. « The Role of Density of States Fluctuations on the C-Axis Resistivity of High T c Superconductors ». Dans Fluctuation Phenomena in High Temperature Superconductors, 201–15. Dordrecht : Springer Netherlands, 1997. http://dx.doi.org/10.1007/978-94-011-5536-6_15.

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Mansour, M. Malek, M. Mareschal, G. Sonnino et E. Kestemont. « Molecular Dynamic Study of Density Fluctuation in a Non-equilibrium system ». Dans Microscopic Simulations of Complex Hydrodynamic Phenomena, 87–99. Boston, MA : Springer US, 1992. http://dx.doi.org/10.1007/978-1-4899-2314-1_6.

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Karthikeyan, Muthusamy. « Evaluation of statistical fluctuation of measured data from nuclear density cone penetrometer ». Dans Cone Penetration Testing 2022, 171–76. London : CRC Press, 2022. http://dx.doi.org/10.1201/9781003329091-18.

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Karthikeyan, Muthusamy. « Evaluation of statistical fluctuation of measured data from nuclear density cone penetrometer ». Dans Cone Penetration Testing 2022, 170–75. London : CRC Press, 2022. http://dx.doi.org/10.1201/9781003308829-18.

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Chu, Yaoquan, et Lizhi Fang. « Luminosity Inhomogeneity of Quasars and the Upper Limit of the Density Fluctuation in the Universe ». Dans The Galactic and Extragalactic Background Radiation, 418–19. Dordrecht : Springer Netherlands, 1990. http://dx.doi.org/10.1007/978-94-009-0653-2_83.

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Kaur, Manpreet, Ankit Kumar, Abdul Quddus, M. Bhuyan et S. K. Patra. « Symmetry Energy of Finite Nuclei Using Relativistic Mean Field Densities within Coherent Density Fluctuation Model ». Dans Multifragmentation in Heavy-Ion Reactions, 173–200. New York : Jenny Stanford Publishing, 2023. http://dx.doi.org/10.1201/9781003385134-7.

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Antonov, Anton Nikolaev, Peter Edward Hodgson et Ivan Zhelyazkov Petkov. « Ground and Excited Collective Nuclear States within the Coherent Density Fluctuation Model and the Generator Coordinate Method ». Dans Springer Series in Nuclear and Particle Physics, 157–69. Berlin, Heidelberg : Springer Berlin Heidelberg, 1993. http://dx.doi.org/10.1007/978-3-642-77766-0_8.

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Fang, Li-Zhi, et Yi-Peng Jing. « Density Fluctuations on Super-Hubble Scales ». Dans Modern Mathematical Models of Time and their Applications to Physics and Cosmology, 73–80. Dordrecht : Springer Netherlands, 1997. http://dx.doi.org/10.1007/978-94-011-5628-8_6.

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Actes de conférences sur le sujet "Density fluctuation"

Degiorai, L., et G. Groner. « Fluctuation effects in charge density wave condensates ». Dans International Conference on Science and Technology of Synthetic Metals. IEEE, 1994. http://dx.doi.org/10.1109/stsm.1994.835922.

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Pan, Honglu, Penghui Su, Xiaoli Cheng et Handong Ma. « Coefficient Revision for Supersonic Turbulent Density Fluctuation Model ». Dans 34th AIAA Applied Aerodynamics Conference. Reston, Virginia : American Institute of Aeronautics and Astronautics, 2016. http://dx.doi.org/10.2514/6.2016-3425.

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Toronov, V., M. Filiaci, S. Fantini et E. Gratton. « Study of Large Scale Fluctuations in Turbid Media by Photon-Density-Wave Fluctuation Correlation Spectroscopy ». Dans Advances in Optical Imaging and Photon Migration. Washington, D.C. : OSA, 1998. http://dx.doi.org/10.1364/aoipm.1998.asub7.

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Li Fang. « Intrinsic electron density fluctuation in a plasma with dust ». Dans Proceedings of ISAPE 2000 : Fifth International Symposium on Antennas, Propagation, and EM Theory. IEEE, 2000. http://dx.doi.org/10.1109/isape.2000.894841.

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Koutin, S. V., et A. N. Lebedev. « Density effects on quantum fluctuation of radiation in synchrotrons ». Dans The sixteenth advanced international committee on future accelerators beam dynamics workshop on nonlinear and collective phenomena in beam physics. AIP, 1999. http://dx.doi.org/10.1063/1.58419.

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Wei, H., et C. Chen. « A second-order algebraic model for turbulent density fluctuation ». Dans 34th Aerospace Sciences Meeting and Exhibit. Reston, Virigina : American Institute of Aeronautics and Astronautics, 1996. http://dx.doi.org/10.2514/6.1996-427.

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Peterleithner, Johannes, Nicolai V. Stadlmair, Jakob Woisetschläger et Thomas Sattelmayer. « Analysis of Measured Flame Transfer Functions With Locally Resolved Density Fluctuation and OH-Chemiluminescence Data ». Dans ASME Turbo Expo 2015 : Turbine Technical Conference and Exposition. American Society of Mechanical Engineers, 2015. http://dx.doi.org/10.1115/gt2015-42745.

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The goal of the study presented in this paper is to analyze flame transfer functions with a new approach based on the combination of-line-of sight OH*-chemiluminescence and density fluctuation data. The OH*-chemiluminescence is acquired with a photomultiplier and an intensified camera, the density fluctuations are measured with a Laser vibrometer on a two axis traverse. In flames with forcing the acoustic fluctuations can be extracted from the data by discrimination of all contributions from combustion noise, because it is not correlated with the excitation device. Assuming rotational symmetry of the fluctuations originating from excitation, planar phase-resolved and pseudo-local OH*-chemiluminescence and density fluctuation data is obtained from the measured line-of-sight integrated signals. In the study this technique is applied to a swirl burner configuration with FTFs from known multi-microphone measurements (MMM). In the first step, the externally premixed mode without equivalence ratio fluctuations is studied and in the second step the fuel is injected in the swirler in order to generate equivalence ratio waves. At selected frequencies the planar fields of the OH*-chemiluminescence and density fluctuations are compared to the FTFs in order to improve the understanding regarding the specific amplitude and phase values. In addition to heat release the vibrometer data reveals the periodic oscillation of the conical annular jet of the cold reactants in the combustor filled with hot products. On the global scale the amplitudes and phases of heat release expected from the MMM are satisfactorily reproduced by both methods for the premixed cases, whereas OH*-chemiluminescence data cannot be used as indicator for heat release if equivalence ratio fluctuations are present, because the amplitude of the FTF is significantly over-predicted due to the sensitivity of OH* on the local fuel-air mixture.

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Takei, Masahiro, Hui Li, Mitsuaki Ochi, Yoshifuru Saito et Kiyoshi Horii. « 3D Wavelet Multiresolution of Multiphase Flow CT Images ». Dans ASME 2002 Joint U.S.-European Fluids Engineering Division Conference. ASMEDC, 2002. http://dx.doi.org/10.1115/fedsm2002-31118.

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The extraction of dominant particle density fluctuation in various time-space frequency levels on a pipeline cross section was performed using capacitance-computed tomography and three-dimensional discrete wavelets transform. As a result, particle density fluctuation downstream of a bent pipe is decomposed into the time-space levels in a non-choking state and a pseudo-choking state. The proposed method enables realization of the time and position at which particle density fluctuations with respect to dominant time-space levels pass through the pipeline.

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Hori, Yoshikazu, Yasushi Matsui, Jun Ohya, Hiroyuki Serizawa et Hisanao Sato. « Theoretical Analysis of Reflection Noise in Semiconductor Lasers ». Dans Numerical Simulation and Analysis in Guided-Wave Optics and Opto-Electronics. Washington, D.C. : Optica Publishing Group, 1989. http://dx.doi.org/10.1364/gwoe.1989.sa2.

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Intensity fluctuations of semiconductor lasers due to optical feedback were theoretically analyzed by using modified rate equations which include a refractive index fluctuation. Photon density fluctuations were simulated, and their Fourier transformed spectra were obtained and analyzed. Optical beating of the external cavity modes, which generates the fluctuation of the refractive indices of the semiconductor materials, is proved to be an origin of the reflection noise.

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Kasahara, Naoto, Nobuyuki Kimura et Hideki Kamide. « Thermal Fatigue Evaluation Method Based on Power Spectrum Density Functions Against Fluid Temperature Fluctuation ». Dans ASME 2005 Pressure Vessels and Piping Conference. ASMEDC, 2005. http://dx.doi.org/10.1115/pvp2005-71307.

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Fluid temperature fluctuates at an incomplete mixing area of high and low temperature fluids in nuclear components. It induces random variations of local temperature gradients in structural walls, which lead to cyclic thermal stresses. When thermal stresses and cycle numbers are large, there are possibilities of fatigue crack initiations and propagations. It is recognized that there are attenuation factors depending on fluctuation frequency in the transfer process from fluid temperature to thermal stresses. If a frequency of fluctuation is very low, whole temperature of the wall can respond to fluid temperature, because thermal diffusivity homogenizes structural temperature. Therefore, low frequency fluctuations do not induce large thermal stress due to temperature gradients in structures. On the other hand, a wall surface cannot respond to very high frequency fluctuation, since a structure has a time constant of thermal response. High frequency fluctuations do not lead to large thermal stress. Paying attention to its attenuation mechanism, Japan Nuclear Cycle Development Institute (JNC) has proposed a fatigue evaluation method related to frequencies. The first step of this method is an evaluation of Power Spectrum Density (PSD) on fluid, from design specifications such as flow rates, diameters of pipes and materials. In the next step, the PSD of fluid is converted to PSD of thermal stress by the frequency transfer function. Finally, the PSD of thermal stress is transformed to time history of stress under an assumption of random phase. Fatigue damage factors can be evaluated from stress ranges and cycles obtained by the rain flow wave count method. Proposed method was applied to evaluate fatigue damage of piping junction model tests conducted at Oarai Engineering Center. Through comparison with direct evaluation from measurements and predictions by conventional methods, the accuracy of the proposed method was validated.

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Rapports d'organisations sur le sujet "Density fluctuation"

Thomas, D. M. An edge density fluctuation diagnostic for DIII-D using lithium beams. Office of Scientific and Technical Information (OSTI), décembre 1991. http://dx.doi.org/10.2172/5690058.

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H. Park, E. Mazzucato, T. Munsat, C.W. Domier, M. Johnson, Jr N.C. Luhmann, J. Wang et al. Simultaneous Microwave Imaging System for Density and Temperature Fluctuation Measurements on TEXTOR. Office of Scientific and Technical Information (OSTI), mai 2004. http://dx.doi.org/10.2172/827935.

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Thomas, D. M. Edge density fluctuation diagnostic for DIII-D using lithium beams : 1992 annual report. Office of Scientific and Technical Information (OSTI), mai 1994. http://dx.doi.org/10.2172/10149833.

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Thomas, D. M. An edge density fluctuation diagnostic for DIII-D using lithium beams. Final report, March 15, 1990--September 15, 1993. Office of Scientific and Technical Information (OSTI), janvier 1994. http://dx.doi.org/10.2172/10134983.

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Thomas, D. M. An edge density fluctuation diagnostic for DIII-D using lithium beams. Technical progress report, [August 15, 1990--November 15, 1991]. Office of Scientific and Technical Information (OSTI), décembre 1991. http://dx.doi.org/10.2172/10122969.

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Shen, W., R. N. Dexter et S. C. Prager. Current density fluctuations and ambipolarity of transport. Office of Scientific and Technical Information (OSTI), octobre 1991. http://dx.doi.org/10.2172/10109823.

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Nazikian, R., et E. Mazzucato. Reflectometer measurements of density fluctuations in tokamak plasmas. Office of Scientific and Technical Information (OSTI), août 1994. http://dx.doi.org/10.2172/10172218.

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Shen, Weimin. Measurement of current density fluctuations and ambipolar particle flux due to magnetic fluctuations in MST. Office of Scientific and Technical Information (OSTI), août 1992. http://dx.doi.org/10.2172/7273865.

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