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Добірка наукової літератури з теми "Inelastic dynamics"

Автор: Grafiati
Опубліковано: 25 січня 2025

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Статті в журналах з теми "Inelastic dynamics"

1

Chaplot, Samrath L., Narayani Choudhury, Subrata Ghose, Mala N. Rao, Ranjan Mittal, and Prabhatasree Goel. "Inelastic neutron scattering and lattice dynamics of minerals." European Journal of Mineralogy 14, no. 2 (March 22, 2002): 291–329. http://dx.doi.org/10.1127/0935-1221/2002/0014-0291.

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2

Ben-Naim, E., S. Y. Chen, G. D. Doolen, and S. Redner. "Shocklike Dynamics of Inelastic Gases." Physical Review Letters 83, no. 20 (November 15, 1999): 4069–72. http://dx.doi.org/10.1103/physrevlett.83.4069.

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3

REDDY, K. ANKI, J. TALBOT, and V. KUMARAN. "Dynamics of sheared inelastic dumbbells." Journal of Fluid Mechanics 660 (August 16, 2010): 475–98. http://dx.doi.org/10.1017/s0022112010002764.

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We study the dynamical properties of the homogeneous shear flow of inelastic dumbbells in two dimensions as a first step towards examining the effect of shape on the properties of flowing granular materials. The dumbbells are modelled as smooth fused disks characterized by the ratio of the distance between centres (L) and the disk diameter (D), with an aspect ratio (L/D) varying between 0 and 1 in our simulations. Area fractions studied are in the range 0.1–0.7, while coefficients of normal restitution (en) from 0.99 to 0.7 are considered. The simulations use a modified form of the event-driven methodology for circular disks. The average orientation is characterized by an order parameter S, which varies between 0 (for a perfectly disordered fluid) and 1 (for a fluid with the axes of all dumbbells in the same direction). We investigate power-law fits of S as a function of (L/D) and (1−en2). There is a gradual increase in ordering as the area fraction is increased, as the aspect ratio is increased or as the coefficient of restitution is decreased. The order parameter has a maximum value of about 0.5 for the highest area fraction and lowest coefficient of restitution considered here. The mean energy of the velocity fluctuations in the flow direction is higher than that in the gradient direction and the rotational energy, though the difference decreases as the area fraction increases, due to the efficient collisional transfer of energy between the three directions. The distributions of the translational and rotational velocities are Gaussian to a very good approximation. The pressure is found to be remarkably independent of the coefficient of restitution. The pressure and dissipation rate show relatively little variation when scaled by the collision frequency for all the area fractions studied here, indicating that the collision frequency determines the momentum transport and energy dissipation, even at the lowest area fractions studied here. The mean angular velocity of the particles is equal to half the vorticity at low area fractions, but the magnitude systematically decreases to less than half the vorticity as the area fraction is increased, even though the stress tensor is symmetric.
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4

Egami, Takeshi. "Real-Space Description of Dynamics of Liquids." Quantum Beam Science 2, no. 4 (October 28, 2018): 22. http://dx.doi.org/10.3390/qubs2040022.

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In strongly disordered matter, such as liquids and glasses, atomic and magnetic excitations are heavily damped and partially localized by disorder. Thus, the conventional descriptions in terms of phonons and magnons are inadequate, and we have to consider spatially correlated atomic and spin dynamics in real-space and time. Experimentally this means that the usual representation of dynamics in terms of the dynamic structure factor, S(Q, E), where Q and E are the momentum and energy exchanges in scattering, is insufficient. We propose a real-space description in terms of the dynamic pair-density function (DyPDF) and the Van Hove function (VHF) as an alternative, and discuss recent results on superfluid 4He by inelastic neutron scattering and water by inelastic X-ray scattering. Today much of the objects of research in condensed-matter physics and materials science are highly complex materials. To characterize the dynamics of such complex materials, the real-space approach is likely to become the mainstream method of research.
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5

Norville, C. C. "Inelastic Pipework Dynamics and Aseismic Design." Journal of Pressure Vessel Technology 114, no. 3 (August 1, 1992): 328–35. http://dx.doi.org/10.1115/1.2929048.

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This paper shows a simple correlation between elastic and inelastic dynamic pipework responses enabling realistic/pessimistic prediction of dynamic pipework responses beyond the elastic range using current elastic aseismic design procedures. In this paper, theoretical studies relating dynamic responses directly to nonlinear material stress/strain characteristics show how such a correlation arises, particularly for materials exhibiting a well-defined yield point inflection, and the evaluation of the correlative parameters (moduli and damping factors). The ABAQUS computer program was used to study and simulate the dynamic inelastic response characteristics of a pressurized tube in the form of simple beam and a pressurized cantilevered elbow (in-plane responses). Using comparative dynamic test results for these components, the foregoing design concepts were verified for representative cyclic material characteristics. So, given appropriate cyclic material characteristics, pessimistic incremental and reverse cyclic fatigue strains may be simply evaluated for loadings beyond the elastic range (for assessment against ASME fatigue criteria) using existing design techniques as shown in the paper.
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6

Obrant, G. Z. "Inelastic π3He-scattering in πNN-dynamics". Nuclear Physics A 503, № 3-4 (жовтень 1989): 849–64. http://dx.doi.org/10.1016/0375-9474(89)90443-0.

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7

Piskunov, V. G., Yu N. Fedorenko, and I. M. Didychenko. "Dynamics of inelastic laminated composite shells." Mechanics of Composite Materials 31, no. 1 (1995): 56–62. http://dx.doi.org/10.1007/bf00616737.

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8

Golde, Tom, Constantin Huster, Martin Glaser, Tina Händler, Harald Herrmann, Josef A. Käs, and Jörg Schnauß. "Glassy dynamics in composite biopolymer networks." Soft Matter 14, no. 39 (2018): 7970–78. http://dx.doi.org/10.1039/c8sm01061g.

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9

Koza, Michael Marek, Hannu Mutka, Yoshihiko Okamoto, Jun-ichi Yamaura, and Zenji Hiroi. "On the microscopic dynamics of the ‘Einstein solids’ AlV2Al20 and GaV2Al20, and of YV2Al20: a benchmark system for ‘rattling’ excitations." Physical Chemistry Chemical Physics 17, no. 38 (2015): 24837–50. http://dx.doi.org/10.1039/c5cp04005a.

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The inelastic response of AV2Al20 (with A = Al, Ga and Y) was probed by high-resolution inelastic neutron scattering experiments and density functional theory (DFT) based lattice dynamics calculations (LDC).
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10

Kratochvíl, Jan. "Dislocation Dynamics and Inelastic Properties of Solids." Materials Science Forum 123-125 (January 1993): 673–84. http://dx.doi.org/10.4028/www.scientific.net/msf.123-125.673.

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Дисертації з теми "Inelastic dynamics"

1

Gates, Gary Anthony. "Inelastic scattering in gas-surface dynamics." Thesis, University of Liverpool, 1994. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.358969.

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2

Marinakis, Sarantos. "The dynamics of inelastic and reactive bimolecular collisions." Thesis, University of Oxford, 2005. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.424735.

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3

McCrudden, Garreth. "Vector correlations in gas-phase inelastic collision dynamics." Thesis, University of Oxford, 2017. http://ora.ox.ac.uk/objects/uuid:967fbe54-98a9-48e9-a0b2-707811804d7a.

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This thesis presents a joint experimental and theoretical study of vector correlations in the electronically, vibrationally, and rotationally inelastic collisions of simple molecules with rare-gas atoms. In the first instance, empirical and calculated data are presented for rotationally inelastic scattering in the NO(X)+Ar and ND3(X̃)+Ar systems at collision energies in the range 405-2210 cm-1. These experiments - the first to be conducted on a newly commissioned crossed-molecular beam machine - measured the k-k' correlation, i.e. that between the vectors describing the relative velocities before and after collision, respectively. The empirical data were subjected to rigorous comparison with both quantum-mechanical and quasi-classical trajectory (QCT) calculations. For both the NO(X)+Ar and ND3(X̃)+Ar systems, there is generally good agreement between experiment and theory at all four collision energies investigated. Two chapters of this thesis focus on the development of trajectory surface-hopping (TSH) QCT models of the OH(A, v = 0)+Kr and OH(A, v = 0)+Xe systems. Experimental data relating to scalar quantities (rotational energy transfer (RET) and electronic quenching) and to the j-j' correlation (which quantifies the depolarisation of the angular momentum of the OH(A) radical) are compared to variable-collision-energy TSH QCT calculations in which the length of the OH bond is fixed. The algorithms involve all three PESs of the OH(A/X)+Kr system, and the full range of electrostatic and roto-electronic mechanisms that couple them, for the first time. The most complete model succeeded in accounting for 93% of experimentally observed quenching. For the OH(A/X)+Xe system, coupling matrix elements were estimated from those of OH(A/X)+Kr, and the most complete model recovered 63% of experimentally observed quenching. This thesis also presents a novel theoretical study of rotationally inelastic dynamics in the OH(A, v = 1)+Kr system. Provisional results from adiabatic calculations in which the OH bond length is allowed to vary over the course of a trajectory are presented alongside experimental data that were reported previously. To date, these calculations continue to underestimate the extent of empirical RET data. Reasons for the observed discrepancy, and suggestions to resolve it, are outlined in detail.
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4

Rusher, Cassandra Amelia. "Inelastic scattering dynamics of ammonia with small molecules." Thesis, Heriot-Watt University, 2016. http://hdl.handle.net/10399/3275.

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Crossed molecular beam velocity map imaging (VMI) is employed to state-selectively record the NH3 inelastic scattering products from collisions with a series of colliders; atomic Ar, diatomic D2, and the polyatomics CH4, C2H6 and C(CH3)4. The differential cross sections (DCSs) presented for NH3-Ar expand on the existing literature. The angular distribution of the scattering is found to exhibit a dependence on the angular momentum projection quantum number (k) of the NH3 product state in addition to the known dependency on the total angular momentum quantum number (J). It is found that for increasing k the total scattering into sideways and backwards angles (θ ≥ 60°) decreases. For the smallest molecular colliders D2 and CH4 co-excitation is observed. DCSs are presented for each NH3 product state and evidence of separate D2 co-excitation channels is obtained by a new extraction method for acquiring multiple DCSs from a single VMI image. The promotion of D2 into the JD2 = 3 rotational level exhibits an unusual propensity for excitation at larger impact parameters. It is proposed that this is due to interactions at larger distances with attractive regions of the potential energy surface (PES), at smaller impact parameters the steeper gradient of the PES inhibits coexcitation. The DCSs of NH3 scattering with methane, ethane and neopentane exhibit a striking similarity across all three systems and when comparing individual NH3 product states from a single collider. The DCSs are all dominated by forwards scattering angles (θ ≤ 60°) for all NH3 collisional excitations. The dominant mechanism suggested is a “tug-of- war” type trajectory, however calculations are required for confirmation of this interaction.
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5

Couto, Rafael Carvalho. "Coupled electron-nuclear dynamics in inelastic X-ray scattering." Universidade Federal de Goiás, 2016. http://repositorio.bc.ufg.br/tede/handle/tede/7510.

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Esta tese dedicada a estudos tericos e experimentais de espalhamento ressonante inelstico de raios-X (Resonant inelastic X-ray scattering - RIXS) de molculas de monxido de carbono e gua em fase gasosa. Usando estado da arte clculos ab initio de estrutura eletrnica e formalismo de pacotes de onda dependente do tempo, uma anlise completa dos espectros RIXS experimental dos dois sistemas moleculares foi realizada. Na anlise do CO RIXS, fomos capazes de reproduzir o experimento RIXS com excelente preciso, permitindo uma descrio completa dos espectros experimentais. Interferncia entre diferentes canais RIXS correspondentes disperso via orbitais moleculares ortogonais no estado excitado do CO descrito. Com a ajuda do espectro de alta resoluo e simulaes ab initio, mostramos a quebra da aproximao de Born-Oppenheimer na regio onde estados nais de Rydberg acoplam com o estado nal de valncia. Explicamos a formao de uma caracterstica espectral, que foi atribuda a um nico estado em estudos anteriores. Alm disso, atravs da combinao experimento-teoria, aprimoramos o mnimo do potencial do estado excitado de valncia E 1 , juntamente com o constante de acoplamento entre o estado de valncia e dois estados de Rydberg. A m de estudar a gua, desenvolvemos uma nova abordagem terica para descrever molculas triatmicas atravs do formalismo de propagao de pacote de ondas, que reproduz com grande preciso a estrutura vibracional os espectros experimentais RIXS de alta resoluo, permitindo obter importantes concluses. Ns demonstramos que, devido ao acoplamento dos modos vibracionais e anarmonicidade do potencial no estado fundamental e das superfcies de energia potencial do estados excitados, diferentes estados excitados de camada interna em RIXS podem ser usados como portas para sondar diferentes dinmicas de vibrao e para mapear o potencial do estado fundamental usando modos normais de vibrao molecular. O ajuste dos raios-X acima da ressonncia de absoro permite extrair informaes adicionais sobre o potencial do estado fundamental, devido alta excitao vibracional. Substituio isotpica investigada por meio de simulaes tericas e as importantes caractersticas da dinmica nuclear so discutidas, especialmente para o estado excitado de camada interna dissociativo, onde um chamado pico \atmico " formado. Este recurso crucial para explicar a dinmica nuclear em RIXS da gua. Mostramos o forte potencial de experimentos RIXS de alta resoluo combinados IV com simulaes tericas de alto nvel para estudos avanados de estados moleculares altamente excitados, bem como superfcies de energia potencial do estado fundamental, send utilizada como uma tcnica auxiliar para espectroscopia ptica e infra vermelho.
This Thesis is devoted to theoretical and experimental studies of resonant inelastic X-ray scattering (RIXS) of gas-phase carbon monoxide and water molecules. Using state-of-the-art ab initio electronic structure calculations and a time-dependent wave packet formalism, we make a complete analysis of the experimental RIXS spectra of the two molecular systems. In the CO RIXS analysis, we are able to reproduce the RIXS experiment with an excellent accuracy, allowing for a complete description of all experimental features. Interference between di erent RIXS channels corresponding to the scattering via orthogonal molecular orbitals in the core-excited state of CO is described. With the help of the high-resolution spectrum and extensive ab initio simulations we show the complete breakdown of the Born- Oppenheimer approximation in the region where forbidden nal Rydberg states are mixed with a valence allowed nal state. Here we explain the formation of a spectral feature which was attributed to a single state in previous studies. Moreover, through an experimentaltheoretical combination, we improve the minimum of the valence E 1 excited state, along with the coupling constant between the valence and two Rydberg states. In order to study the water system, we developed a new theoretical approach to describe triatomic molecules through the wave packet propagation formalism, which reproduces with high accuracy the vibrational structure of the high-resolution experimental quasi-elastic RIXS spectra, allowing to draw several important conclusions. We demonstrate that due to the vibrational mode coupling and anharmonicity of the ground and core-excited potential energy surfaces, di erent core-excited states in RIXS can be used as gates to probe di erent vibrational dynamics and to map the ground state potential using molecular vibrational normal modes. Tuning the X-rays above the absorption resonance allows to extract additional information about the ground state potential, due to high vibrational excitation. Isotopic substitution is investigated by theoretical simulations and important dynamical features are discussed, especially for the dissociative core-excited state, where a so-called \atomic" peak is formed. This feature is crucial to explain the nuclear dynamics in RIXS from water. We show the strong potential of high-resolution RIXS experiments combined with high-level theoretical simulations for advanced studies of highly excited molecular states, as well as of ground state potential energy surfaces, as an auxiliary technique to optical and IR spectroscopy.
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6

Inoue, Rintaro. "Dynamics in Polymer Thin Films by Inelastic Neutron Scattering." 京都大学 (Kyoto University), 2008. http://hdl.handle.net/2433/57278.

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7

Fabiani, Elisa. "Dynamics in strong glasses : an inelastic neutron scattering analysis." Université Joseph Fourier (Grenoble), 2005. http://www.theses.fr/2005GRE10031.

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Le but principal de cette thèse est d'effectuer une recherche systématique sur la dynamique des matériaux vitreux à des températures T beaucoup plus petites que la température de transition vitreuse Tg. Des études théoriques et expérimentales, exécutées pendant les deux dernières décennies sur différents aspects de l'état vitreux, ont établi un certain nombre de propriétés particulières qui concernent le dynamique à basse énergie et qui se manifestent dans la chaleur spécifique à basse température, dans la conductivité thermique, et dans la diffusion inélastique expérimentale. Certaines questions fondamentales dans ce domaine, relatives à la nature microscopique de la dynamique et à l'origine des caractéristiques "universelles" de la densité des états vibrationnels (VDOS) dans les verres, n'ont pas trouvé actuellement une réponse généralement admise. Afin d'expliquer certaines caractéristiques des verres, nous avons étudié deux verres forts, le quartz fondu (v-SiO2) et l'oxyde de germanium vitreux (v-GeO2). La technique utilisée est la dispersion inélastique des neutrons. Les études de ces échantillons avaient pour objectifs : i) le développement d'une nouvelle procédure pour extraire la VDOS à partir des systèmes cohérents en étendant l'approximation incohérente habituelle ; ii) l'étude de la diffusion quasiélastique de nos échantillons dans la région de très de basse fréquence ; iii) la comparaison des données de dispersion précédemment mentionnées, afin de calculer la fonction de couplage Raman C(w) et sa limite à basse fréquence ; iv) l'étude du v-GeO2 afin de prouver que les branches acoustiques longitudinales et transversales sont aussi définies dans le système vitreux
The main task of this thesis is to perform a systematic investigation of the dynamics of glassy materials at temperatures T much smaller than Tg, the glass transition temperature. Both theoretical and experimental studies performed over the last two decades on different aspects of the glassy state, have established a number of peculiar properties that concem low energy dynamics and manifest themselves in low temperature specifie heat, thermal conductivity, and inelastic scattering experiments. Sorne of the fundamental questions in this field, in particular about the microscopie nature of the dynamics and the origin of the "universal" features concerning the density of vibrational states in glasses, have not found a generally accepted answer. Ln order to explain some features of strong glasses, different systems have been investigated. Here we present new results on two strong glasses, vitreous silica (v-SiO2) and vitreous germania (vGeO2). The technique employed was inelastic Neutron Scattering (lNS). The studies of these sam pies have been done in order to : i) develop a new procedure to extract the density of states from coherent systems extending the usual Incoherent approximation ; (ii) study the QES of our samples at very low frequency range (in order to compare with Brillouin data and to asses a correlation with the mechanism causing the sound attenuation) ; (iii) compare of the previous scattering data above-mentioned, in order to calculate the Raman coupling function C(w) and its low frequency limit ; (iv) finally, investigate v-GeO2 to asses that both longitudinal and transverse acoustic branches are still somewhat defined also in glassy system
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8

Olgun, Asim. "The kinetics and dynamics of the liquid surface from molecular beam scattering." Thesis, University of Sussex, 1997. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.388968.

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9

Saunders, Oliver Daniel. "Inelastic electron dynamics at clean and midified noble metal surfaces." Thesis, University of Bath, 2010. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.538282.

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10

Jayne, Allen A. "Inelastic rotation requirements of two-span continuous bridge girders." Access to citation, abstract and download form provided by ProQuest Information and Learning Company; downloadable PDF file 7.08 Mb., p. 153, 2005. http://proquest.umi.com/pqdlink?did=1042538801&Fmt=7&clientId=8331&RQT=309&VName=PQD.

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Книги з теми "Inelastic dynamics"

1

W, Beijerinck Herman C., and Verhaar B. J, eds. Dynamics of inelastic collisions of electronically excited atoms. [Amsterdam]: North-Holland, 1990.

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2

Mróz, Zenon. Inelastic Behaviour of Structures under Variable Loads. Dordrecht: Springer Netherlands, 1995.

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3

1948-, Weichert Dieter, Maier Giulio, and International Centre for Mechanical Sciences., eds. Inelastic behaviour of structures under variable repeated loads: Direct analysis methods. Wien: Springer, 2002.

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4

International Symposium on Multiparticle Dynamics (26th 1996 Faro, Portugal). Proceedings of the XXVI International Symposium on Multiparticle Dynamics, Faro, Portugal, 1-5 September 1996. Singapore: World Scientific, 1997.

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5

International Symposium on Multiparticle Dynamics (24th 1994 Salerno, Italy). Proceedings of the XXIV International Symposium on Multiparticle Dynamics, Vietri sul Mare, Salerno, Italy, 12-19 September 1994. Singapore: World Scientific, 1995.

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6

Shi, Chenyang. Local structure and lattice dynamics study of low dimensional materials using atomic pair distribution function and high energy resolution inelastic x-ray scattering. [New York, N.Y.?]: [publisher not identified], 2015.

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7

Workshop on Inelastic and Quasielastic Neutron Scattering in Biology (1996 Institut Laue-Langevin). Biological macromolecular dynamics: Proceedings of a Workshop on Inelastic and Quasielastic Neutron Scattering in Biology, Institut Laue-Langevin, Grenoble, France, 14-15 October 1996. Edited by Cusack Stephen. Schenectady, NY, USA: Adenine Press, 1997.

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8

Associates, Key, ed. FMA-3D theoretical manual: A program for simulating the large deformation, elastic and inelastic, transient dynamic response of three-dimensional solids and structures : version 7.43, March 26, 1994. Albuquerque, N.M: Key Associates, 1994.

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9

Schu¨lke, Winfried. Electron Dynamics by Inelastic X-ray Scattering. Oxford University Press, Incorporated, 2007.

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10

Dorner, B. Coherent Inelastic Neutron Scattering in Lattice Dynamics. Springer, 2006.

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Частини книг з теми "Inelastic dynamics"

1

Ben-Naim, Eli, and Paul L. Krapivsky. "The Inelastic Maxwell Model." In Granular Gas Dynamics, 65–94. Berlin, Heidelberg: Springer Berlin Heidelberg, 2003. http://dx.doi.org/10.1007/978-3-540-39843-1_3.

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2

McNamara, S. "Inelastic Collapse." In Dynamics: Models and Kinetic Methods for Non-equilibrium Many Body Systems, 267–77. Dordrecht: Springer Netherlands, 2000. http://dx.doi.org/10.1007/978-94-011-4365-3_15.

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Trugman, S. A., Li-Chung Ku, and J. Bonča. "The Dynamics of Inelastic Quantum Tunneling." In Molecular Nanowires and Other Quantum Objects, 167–76. Dordrecht: Springer Netherlands, 2004. http://dx.doi.org/10.1007/978-1-4020-2093-3_16.

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Raghavi, K., L. Kavitha, and C. Lavanya. "Inelastic Soliton Collision in Multispecies Inhomogeneous Plasma." In Nonlinear Dynamics and Applications, 155–65. Cham: Springer International Publishing, 2022. http://dx.doi.org/10.1007/978-3-030-99792-2_14.

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Gagliardi, A., G. C. Solomon, A. Pecchia, A. Di Carlo, T. Frauenheim, J. R. Reimers, and N. S. Hush. "Simulations of Inelastic Tunnelling in Molecular Bridges." In Nonequilibrium Carrier Dynamics in Semiconductors, 183–86. Berlin, Heidelberg: Springer Berlin Heidelberg, 2006. http://dx.doi.org/10.1007/978-3-540-36588-4_41.

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6

Dimentberg, Mikhail, Oleg Gaidai, and Arvid Naess. "Random Vibrations with Inelastic Impacts." In Vibro-Impact Dynamics of Ocean Systems and Related Problems, 67–78. Berlin, Heidelberg: Springer Berlin Heidelberg, 2009. http://dx.doi.org/10.1007/978-3-642-00629-6_7.

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7

Bobylev, Alexander V., and Carlo Cercignani. "Self-Similar Asymptotics for the Boltzmann Equation with Inelastic Interactions." In Granular Gas Dynamics, 119–29. Berlin, Heidelberg: Springer Berlin Heidelberg, 2003. http://dx.doi.org/10.1007/978-3-540-39843-1_5.

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8

March, Norman H. "Dynamics of Adparticles and Neutron Inelastic Scattering." In Chemical Bonds Outside Metal Surfaces, 91–119. Boston, MA: Springer US, 1986. http://dx.doi.org/10.1007/978-1-4613-2117-0_4.

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West, Geoffrey B. "Deep Inelastic Scaling in Nuclear and Particle Physics." In New Aspects of Nuclear Dynamics, 1–45. Boston, MA: Springer US, 1989. http://dx.doi.org/10.1007/978-1-4613-0547-7_1.

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Dianoux, A. J. "Quasi-Elastic and Inelastic Neutron Scattering." In The Time Domain in Surface and Structural Dynamics, 179–212. Dordrecht: Springer Netherlands, 1988. http://dx.doi.org/10.1007/978-94-009-2929-6_10.

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Тези доповідей конференцій з теми "Inelastic dynamics"

1

Garzó, Vicente. "Impurities in inelastic Maxwell models." In RAREFIED GAS DYNAMICS: 24th International Symposium on Rarefied Gas Dynamics. AIP, 2005. http://dx.doi.org/10.1063/1.1941633.

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2

Kuninaka, Hiroto. "The Simulation of the Inelastic Impact." In SLOW DYNAMICS IN COMPLEX SYSTEMS: 3rd International Symposium on Slow Dynamics in Complex Systems. AIP, 2004. http://dx.doi.org/10.1063/1.1764101.

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Bonaccorso, A., and D. M. Brink. "Inelastic breakup in inclusive continuum spectra." In Towards a unified picture of nuclear dynamics. AIP, 1992. http://dx.doi.org/10.1063/1.42033.

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4

Sur, Sangeeta, Richard Dawes, Ernesto Quintas S�nchez, and Steve Ndengue. "INELASTIC COLLISION DYNAMICS OF O3 + Ar." In 74th International Symposium on Molecular Spectroscopy. Urbana, Illinois: University of Illinois at Urbana-Champaign, 2019. http://dx.doi.org/10.15278/isms.2019.rj08.

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Makris, Nicos, and Theodoros Psychogios. "Dimensional Response Analysis of Inelastic Structures." In Geotechnical Earthquake Engineering and Soil Dynamics Congress IV. Reston, VA: American Society of Civil Engineers, 2008. http://dx.doi.org/10.1061/40975(318)125.

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Sutton, M. R. "Jet production in deep inelastic scattering at HERA." In MULTIPARTICLE DYNAMICS: XXXV International Symposium on Multiparticle Dynamics; and Workshop on Particle Correlations and Femtoscopy. AIP, 2006. http://dx.doi.org/10.1063/1.2197414.

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Khalil, Nagi, and Vicente Garzó. "Transport properties of driven inelastic Maxwell mixtures." In 31ST INTERNATIONAL SYMPOSIUM ON RAREFIED GAS DYNAMICS: RGD31. AIP Publishing, 2019. http://dx.doi.org/10.1063/1.5119624.

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Terrón, Juan. "Study of color dynamics in photoproduction at HERA." In DEEP INELASTIC SCATTERING: 13th International Workshop on Deep Inelastic Scattering; DIS 2005. AIP, 2005. http://dx.doi.org/10.1063/1.2122136.

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Bobylev, A. "Self-Similar Solutions of the Boltzmann Equation with Elastic and Inelastic Interactions." In RAREFIED GAS DYNAMICS: 24th International Symposium on Rarefied Gas Dynamics. AIP, 2005. http://dx.doi.org/10.1063/1.1941545.

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10

Pettersson, Rolf. "On Stationary Solutions to the Linear Boltzmann Equation with Inelastic Granular Collisions." In RAREFIED GAS DYNAMICS: 24th International Symposium on Rarefied Gas Dynamics. AIP, 2005. http://dx.doi.org/10.1063/1.1941546.

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Звіти організацій з теми "Inelastic dynamics"

1

Smoliar, Laura Ann. Dynamics of inelastic and reactive gas-surface collisions. Office of Scientific and Technical Information (OSTI), April 1995. http://dx.doi.org/10.2172/86302.

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Sapkota, Aashish. Studies of spin dynamics in 122 transition metal arsenides using inelastic neutron scattering technique. Office of Scientific and Technical Information (OSTI), May 2018. http://dx.doi.org/10.2172/1505188.

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Stassis, C. Inelastic neutron scattering of {gamma}-iron, and the determination of the elastic constants by lattice dynamics. Office of Scientific and Technical Information (OSTI), October 1993. http://dx.doi.org/10.2172/10188986.

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4

White, Thomas. Investigation into the transport properties of planetary interiors through inelastic X-ray scattering experiments and quantum molecular dynamics (Final Technical Report). Office of Scientific and Technical Information (OSTI), June 2021. http://dx.doi.org/10.2172/1797446.

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5

Haberman, K. S., J. G. Bennett, and Cheng Liu. The dynamic inelastic behavior in fiber reinforced composite materials. Office of Scientific and Technical Information (OSTI), March 1997. http://dx.doi.org/10.2172/464153.

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6

Groeneveld. L51673 The Development of a Ductile Pipe Fracture Model. Chantilly, Virginia: Pipeline Research Council International, Inc. (PRCI), May 1987. http://dx.doi.org/10.55274/r0010550.

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Анотація:
Covers a project to develop a fluid/structure/fracture interactive, inelastic-dynamic computational model for ductile fracture in gas transmission pipelines developed in cooperation with SNAM in Italy to infer specimen-size independent measures of the propagating fracture toughness from small-scale tests on line pipe materials. Verification by CSM on 56-in. diameter.See PR-15-527 (also L51673)
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7

Symonds, P. S. Dynamic Plastic Instabilities in Nonlinear Inelastic Response to Pulse Loading. Fort Belvoir, VA: Defense Technical Information Center, November 1991. http://dx.doi.org/10.21236/ada244486.

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8

Nasr, Jonathan. DEVELOPMENT OF A DESIGN GUIDELINE FOR BRIDGE PILE FOUNDATIONS SUBJECTED TO LIQUEFACTION-INDUCED LATERAL SPREADING. Deep Foundations Institute, May 2018. http://dx.doi.org/10.37308/cpf-2016-ssmc-1.

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Effective-stress nonlinear dynamic analyses (NDA) were performed for piles in liquefiable sloped ground to assess how inertia and liquefaction-induced lateral spreading combine in long-duration vs. short-duration earthquakes. A parametric study was performed using input motions from subduction and crustal earthquakes covering a wide range of earthquake durations. The NDA results were used to evaluate the accuracy of the equivalent static analysis (ESA) recommended by Caltrans/ODOT for estimating pile demands. Finally, the NDA results were used to develop new ESA methods to combine inertial and lateral spreading loads for estimating elastic and inelastic pile demands. The NDA results showed that pile demands increase in liquefied conditions compared to nonliquefied conditions due to the interaction of inertia (from superstructure) and kinematics (from liquefaction-induced lateral spreading). Comparing pile demands estimated from ESA recommended by Caltrans/ODOT with those computed from NDA showed that the guidelines by Caltrans/ODOT (100% kinematic combined with 50% inertia) slightly underestimates demands for subduction earthquakes with long durations. A revised ESA method was developed to extend the application of the Caltrans/ODOT method to subduction earthquakes. The inertia multiplier was back-calculated from the NDA results and new multipliers were proposed: 100% Kinematic + 60% Inertia for crustal earthquakes and 100% Kinematic + 75% Inertia for subduction earthquakes. The proposed ESA compared reasonably well against the NDA results for elastic piles. The revised method also made possible to estimate demands in piles that performed well in the dynamic analyses but could not be analyzed using Caltrans/ODOT method (i.e. inelastic piles that remained below Fult on the liq pushover curve). However, it was observed that the pile demands became unpredictable for cases where the pile head displacement exceeded the displacement corresponding to the ultimate pushover force in liquefied conditions. Nonlinear dynamic analysis is required for these cases to adequately estimate pile demands.
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9

Pullammanappallil, Pratap, Haim Kalman, and Jennifer Curtis. Investigation of particulate flow behavior in a continuous, high solids, leach-bed biogasification system. United States Department of Agriculture, January 2015. http://dx.doi.org/10.32747/2015.7600038.bard.

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Recent concerns regarding global warming and energy security have accelerated research and developmental efforts to produce biofuels from agricultural and forestry residues, and energy crops. Anaerobic digestion is a promising process for producing biogas-biofuel from biomass feedstocks. However, there is a need for new reactor designs and operating considerations to process fibrous biomass feedstocks. In this research project, the multiphase flow behavior of biomass particles was investigated. The objective was accomplished through both simulation and experimentation. The simulations included both particle-level and bulk flow simulations. Successful computational fluid dynamics (CFD) simulation of multiphase flow in the digester is dependent on the accuracy of constitutive models which describe (1) the particle phase stress due to particle interactions, (2) the particle phase dissipation due to inelastic interactions between particles and (3) the drag force between the fibres and the digester fluid. Discrete Element Method (DEM) simulations of Homogeneous Cooling Systems (HCS) were used to develop a particle phase dissipation rate model for non-spherical particle systems that was incorporated in a two-fluid CFDmultiphase flow model framework. Two types of frictionless, elongated particle models were compared in the HCS simulations: glued-sphere and true cylinder. A new model for drag for elongated fibres was developed which depends on Reynolds number, solids fraction, and fibre aspect ratio. Schulze shear test results could be used to calibrate particle-particle friction for DEM simulations. Several experimental measurements were taken for biomass particles like olive pulp, orange peels, wheat straw, semolina, and wheat grains. Using a compression tester, the breakage force, breakage energy, yield force, elastic stiffness and Young’s modulus were measured. Measurements were made in a shear tester to determine unconfined yield stress, major principal stress, effective angle of internal friction and internal friction angle. A liquid fludized bed system was used to determine critical velocity of fluidization for these materials. Transport measurements for pneumatic conveying were also assessed. Anaerobic digestion experiments were conducted using orange peel waste, olive pulp and wheat straw. Orange peel waste and olive pulp could be anaerobically digested to produce high methane yields. Wheat straw was not digestible. In a packed bed reactor, anaerobic digestion was not initiated above bulk densities of 100 kg/m³ for peel waste and 75 kg/m³ for olive pulp. Interestingly, after the digestion has been initiated and balanced methanogenesis established, the decomposing biomass could be packed to higher densities and successfully digested. These observations provided useful insights for high throughput reactor designs. Another outcome from this project was the development of low cost devices to measure methane content of biogas for off-line (US$37), field (US$50), and online (US$107) applications.
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Moghimi, Gholamreza, and Nicos Makris. Response Modification of Structures with Supplemental Rotational Inertia. Pacific Earthquake Engineering Research Center, University of California, Berkeley, CA, January 2024. http://dx.doi.org/10.55461/tihv1701.

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Анотація:
Tall, multistory, buildings are becoming increasingly popular in large cities as a result of growing urbanization trends (United Nations Department of Economic and Social Affairs 2018). As cities continue to grow, many of them along the coasts of continents which are prone to natural hazards, the performance of tall, flexible buildings when subjected to natural hazards is a pressing issue with engineering relevance. The performance of structures when subjected to dynamic loads can be enhanced with various response modification strategies which have been traditionally achieved with added stiffness, flexibility, damping and strength (Kelly et al. 1972; Skinner et al. 1973, 1974; Clough and Penzien 1975; Zhang et al. 1989; Aiken 1990; Whittaker et al. 1991; Makris et al. 1993a,b; Skinner et al. 1993; Inaudi and Makris 1996; Kelly 1997; Soong and Dargush 1997; Constantinou et al. 1998; Makris and Chang 2000a; Chang and Makris 2000; Black et al. 2002, 2003; Symans et al. 2008; Sarlis et al. 2013; Tena-Colunga 1997). Together with the elastic spring that produces a force proportional to the relative displacement of its end-nodes and the viscous dashpot that produces a force proportional to the relative velocity of its end-nodes; the inerter produces a force proportional to the relative acceleration of its end-nodes and emerges as the third elementary mechanical element (in addition to the spring and dashpot) capable for modifying structural response. Accordingly, in this report we examine the seismic performance of multistory and seismically isolated structures when equipped with inerters. In view that the inerter emerges as the third elementary mechanical element for the synthesis of mechanical networks, in Chapter 2 we derive the basic frequency- and time-response functions of the inerter together with these of the two-parameter inertoelastic and inertoviscous mechanical networks. Chapter 3 examines the response of a two-degree-of-freedom (2DOF) structure where the first story is equipped with inerters. Both cases of a stiff and a compliant support of the inerters are examined. The case of two parallel clutching inerters is investigated and the study concludes that as the compliance of the frame that supports the inerters increases, the use of a single inerter offers more favorable response other than increasing the force transferred to the support frame. Chapter 4 examines the seismic response analysis of the classical two-degree-of-freedom isolated structure with supplemental rotational inertia (inerter) in its isolation system. The analysis shows that for the “critical” amount of rotational inertia which eliminates the participation of the second mode, the effect of this elimination is marginal on the structural response since the participation of the second mode is invariably small even when isolation systems without inerters are used. Our study, upon showing that the reaction force at the support of the inerter is appreciable, proceeds with a non-linear response analysis that implements a state-space formulation which accounts for the bilinear behavior of practical isolation system (single concave sliding bearings or lead-rubber bearings) in association with the compliance of the support of the inerter. Our study concludes that supplemental rotational inertia aggravates the displacement and acceleration response of the elastic superstructure and as a result, for larger isolation periods (Tb > 2.5s) the use of inerters in isolation systems is not recommended. Chapter 5 first examines the response analysis of a SDOF elastoplastic and bilinear structure and reveals that when the yielding structure is equipped with supplemental rotational inertia, the equal- displacement rule is valid starting from lower values of the pre-yielding period given that the presence of inerters lengthens the apparent pre-yielding period. The analysis concludes that sup- plemental rotational inertia emerges as an attractive response modification strategy for elastoplastic and bilinear SDOF structures with pre-yielding periods up to T1 = 1.5sec. For larger pre-yielding periods (say T1 > 2.0sec), the effectiveness of inerters to suppress the inelastic response of 2DOF yielding structures reduces; and for very flexible first stories; as in the case of isolated structures examined in chapter 4, the use of inerter at the first level (isolation system) is not recommended. Finally, chapter 6 shows that, in spite of the reduced role of inerters when placed at floor levels other than the first level (they no-longer suppress the induced ground acceleration nor they can eliminate the participation of higher modes), they still manifest a unique role since it is not possible to replace a structure with solitary inerters at higher levels with an equivalent traditional structure without inerters.
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