Thematische Bibliographien / Distributed anisotropy

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Auswahl der wissenschaftlichen Literatur zum Thema „Distributed anisotropy“

Autor: Grafiati

Veröffentlicht am 25. Mai 2024

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Zeitschriftenartikel zum Thema "Distributed anisotropy"

Stiskalek, Richard, John Veitch und Chris Messenger. „Are stellar-mass binary black hole mergers isotropically distributed?“ Monthly Notices of the Royal Astronomical Society 501, Nr. 1 (21.11.2020): 970–77. http://dx.doi.org/10.1093/mnras/staa3613.

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ABSTRACT The Advanced LIGO and Advanced Virgo gravitational wave detectors have detected a population of binary black hole mergers in their first two observing runs. For each of these events, we have been able to associate a potential sky location region represented as a probability distribution on the sky. Thus, at this point we may begin to ask the question of whether this distribution agrees with the isotropic model of the Universe, or if there is any evidence of anisotropy. We perform Bayesian model selection between an isotropic and a simple anisotropic model, taking into account the anisotropic selection function caused by the underlying antenna patterns and sensitivity of the interferometers over the sidereal day. We find an inconclusive Bayes factor of 1.3: 1, suggesting that the data from the first two observing runs are insufficient to pick a preferred model. However, the first detections were mostly poorly localized in the sky (before the Advanced Virgo joined the network), spanning large portions of the sky and hampering detection of potential anisotropy. It will be appropriate to repeat this analysis with events from the recent third LIGO observational run and a more sophisticated cosmological model.

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Rongkonusa, Melisa, Gerald Tamuntuan und Guntur Pasau. „Analisis Anisotropi Suseptibilitas Magnetik Batuan Beku Lengan Utara Sulawesi“. Jurnal MIPA 6, Nr. 1 (02.05.2017): 8. http://dx.doi.org/10.35799/jm.6.1.2017.15846.

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Telah dilakukan penelitian untuk menentukan pola anisotropi suseptibilitas magnetik dan status singkapan batuan beku dari pola yang diperoleh. Pengukuran anisotropi suseptibilitas magnetic dilakukan pada lima sampel batuan beku dari Sulawesi Utara menggunakan Bartington MS2B. Arah pengukuran sampel disesuaikan dengan desain Tauxe. Hasilnya menunjukkan bahwa suseptibilitas maksimum terdistribusi disekitar arah utara dan timur. Sedangkan suseptibilitas intermediet dan minimum terdistribusi disekitar Utara-Timur dan Timur-Selatan. Elipsoida suseptibilitas cenderung prolate atau lebih lonjong. Batuan beku yang dianalisis merupakan kelompok batuan terobosan yang mekanisme lelehannya terjadi secara vertikal.A research has been conducted to determine the anisotropic pattern of magnetic susceptibility and the status of igneous rocks exposure from the obtained pattern. We have measured the anisotropy of magnetic susceptibility on five samples of igneous rock from North Sulawesi by Bartington MS2B. The position of samples were adjusted according to the Tauxe’s design. The result shows that the maximum susceptibility is distributed around northward and eastward, while the intermediate and minimum susceptibility are distributed around nortward-eastward and eastward-southward. The susceptibility ellipsoid tends to be prolate or more oval. This shows that the igneous rocks that have been analyzed are group of intrusive rocks which melting mechanism occurs through vertical fracture.enetie

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Liu, Honglei, Wenhao Shi und Tianhong Yang. „Numerical Modeling on Anisotropy of Seepage and Stress Fields of Stratified Rock Slope“. Mathematical Problems in Engineering 2020 (07.04.2020): 1–10. http://dx.doi.org/10.1155/2020/4956025.

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Stratified rock mass is a common rock mass structure and distributed widely on the earth’s crust. High-density distribution of stratified structural planes in the stratified rock mass has a great influence on the mechanics properties of the rock mass, such as anisotropy of stress and seepage. Therefore, anisotropy is the inherent characteristic that must be considered in the stratified rock mass as well as the stratified rock slope stability. According to the anisotropic characteristics of stratified rock mass, an anisotropic seepage-stress coupled model for the mechanical behavior of stratified rock slope is proposed based on the anisotropy elasticity theory. The model is validated by simulating seepage and stress fields of an idealized slope using the finite element method. The deformation and stress-dependent permeability of the slope are predicted and compared well with the previous study, thus confirming its capability in characterizing the response of rock slope that is dominantly affected by rock anisotropy. Finally, the model is used to simulate the anisotropic properties of a stratified rock slope of Fushun west open-pit mine, China. The simulation is in good agreement with the actual measurement, which means the proposed model is capable of simulating anisotropic properties of the stratified rock slope.

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Abbasnejadfard, Morteza, Morteza Bastami und Afshin Fallah. „Investigation of anisotropic spatial correlations of intra-event residuals of multiple earthquake intensity measures using latent dimensions method“. Geophysical Journal International 222, Nr. 2 (21.05.2020): 1449–69. http://dx.doi.org/10.1093/gji/ggaa255.

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SUMMARY Considering spatial correlation of multiple earthquake intensity measures (IMs) is of particular importance in loss assessment of spatially distributed assets. This subject has been investigated in previous studies under the assumption of isotropy. Considering the fact that the assumption of isotropy is not valid in general, the present study employs a non-separable covariance model based on latent dimensions method to investigate anisotropic properties of spatial correlations and cross-correlations of intra-event residuals of multiple earthquake IMs. This method leads to the generation of valid covariance matrix in order to model anisotropic spatially distributed multivariate random fields. Two sets of IMs are considered in this study; the first set consists of peak ground intensity values (acceleration, velocity, and displacement), and the second set consists of spectral accelerations at three different periods. Data of 10 earthquake events in California and Japan are utilized in this study to estimate parameters of marginal and cross-covariance models. Moreover, parameters of covariance model of regional site condition, which is considered as average shear wave velocity of top 30 m of soil profile (Vs30), are obtained in order to investigate the effect of local sited conditions on spatial correlations of IMs. It is shown that maximum range and anisotropy ratio of covariance models of intra-event residuals of IMs are correlated with those of Vs30 values. Also, it is observed that the anisotropy direction of residuals of IMs is consistent with anisotropy direction of Vs30 values. Finally, predictive models are proposed to obtain marginal and cross-covariance functions for different earthquake IMs considering anisotropy.

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Li, Wei, Douglas R. Schmitt, Maria Tibbo und Changchun Zou. „A program to calculate the state of stress in the vicinity of an inclined borehole through an anisotropic rock formation“. GEOPHYSICS 84, Nr. 5 (01.09.2019): F103—F118. http://dx.doi.org/10.1190/geo2018-0097.1.

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A borehole existing in any geologic formation concentrates the far-field tectonic and overburden stresses amplifying the magnitudes of certain stress components near the borehole. It is important to understand the magnitudes and patterns of this stress concentration because these lead to damage and can even collapse the borehole if sufficiently strong. The solution of the stress distributed near a borehole can be complicated considering the elastic anisotropy of rocks. We have developed programs (ASCIB3D) in MATLAB and Python to model the stress distribution around an inclined borehole in an arbitrarily oriented anisotropic medium. The program is built on the Lekhnitskij-Amadei solution. The input orientation of the far-field stresses and the elastic stiffness matrix of the medium into the program are geology angles instead of the rotation angles shown in previous studies, making the code more convenient for users. The sign convention for the inverse function, which is ignored in previous studies, is discussed in detail. The results indicate that the program ASCIB3D is a useful tool for modeling the stress distributed around an inclined borehole in the anisotropic formation and analyzing the effect of anisotropy and borehole inclination on stress distribution. The inclination and azimuth of the borehole and the anisotropy of the rocks affect the orientation and strength of the stress concentration.

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Kumar, Rajneesh, und Raj Rani Gupta. „Deformation due to various sources in a fibre-reinforced anisotropic generalized thermoelastic medium“. Canadian Journal of Physics 87, Nr. 2 (Februar 2009): 179–87. http://dx.doi.org/10.1139/p09-017.

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The present investigation is concerned with the deformation of a fibre-reinforced, anisotropic, generalized thermoelastic medium subjected to mechanical and thermal sources acting on the plane surface. Close-form solutions for stresses and temperature distribution are derived using Laplace transforms for time and Fourier transforms for space. As an application of the approach concentrated, uniformly distributed, and linearly distributed sources are taken. A numerical inversion technique is applied to obtain the solution in the physical domain. Effects of anisotropy and thermal relaxation are shown graphically on the resulting quantities.

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Trach, V. M., A. V. Podvornyi und N. B. Zhukova. „Stability of non-thin anisotropic cylindrical shells in spatial position under distributed lateral pressure“. Bulletin of Taras Shevchenko National University of Kyiv. Series: Physics and Mathematics, Nr. 2 (2023): 152–55. http://dx.doi.org/10.17721/1812-5409.2023/2.26.

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A three-dimensional approach to solving the problem of stability of non-thin cylindrical anisotropic layered shells under distributed lateral pressure is proposed. Based on the modified Hu-Washizu variational principle, a three-dimensional system of homogeneous differential stability equations is obtained for the calculation of shells, the anisotropy of which is characterized by a material with one plane of elastic symmetry. The solution of the three-dimensional system was carried out using the Bubnov-Galerkin methods and numerical discrete orthogonalization. The influence of an increase in the number of cross-laid layers of the same thickness on the stability of an anisotropic cylindrical shell is studied. The results of the solution are presented by graphs and their analysis is given.

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Wang, Bitao, Michele Cappellari und Yingjie Peng. „Physical explanation for the galaxy distribution on the (λR, ε) and (V/σ, ε) diagrams or for the limit on orbital anisotropy“. Monthly Notices of the Royal Astronomical Society: Letters 500, Nr. 1 (Januar 2020): L27—L31. http://dx.doi.org/10.1093/mnrasl/slaa176.

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ABSTRACT In the (λR, ε) and (V/σ, ε) diagrams for characterizing dynamical states, the fast-rotator galaxies (both early type and spirals) are distributed within a well-defined leaf-shaped envelope. This was explained as due to an upper limit to the orbital anisotropy increasing with galaxy intrinsic flattening. However, a physical explanation for this empirical trend was missing. Here, we construct Jeans Anisotropic Models (JAM), with either cylindrically or spherically aligned velocity ellipsoid (two extreme assumptions), and each with either spatially constant or variable anisotropy. We use JAM to build mock samples of axisymmetric galaxies, assuming on average an oblate shape for the velocity ellipsoid (as required to reproduce the rotation of real galaxies), and limiting the radial anisotropy β to the range allowed by physical solutions. We find that all four mock samples naturally predict the observed galaxy distribution on the (λR, ε) and (V/σ, ε) diagrams, without further assumptions. Given the similarity of the results from quite different models, we conclude that the empirical anisotropy upper limit in real galaxies, and the corresponding observed distributions in the (λR, ε) and (V/σ, ε) diagrams, are due to the lack of physical axisymmetric equilibrium solutions at high β anisotropy when the velocity ellipsoid is close to oblate.

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MALARZ, K. „A SIMPLE SOLID-ON-SOLID MODEL OF EPITAXIAL FILM GROWTH: SUBMONOLAYER SUBSTRATE COVERAGE“. International Journal of Modern Physics C 11, Nr. 08 (Dezember 2000): 1561–66. http://dx.doi.org/10.1142/s0129183100001449.

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In this work, we investigate the influence of substrate temperature on the surface morphology for substrate coverage below one monolayer. The model of film growth is based on random deposition enriched by limited surface diffusion. Also, anisotropy in the growth is involved. We found from computer simulations for the simple cubic lattice and solid-on-solid model that the surface morphology changes with increasing temperature from isotropically distributed isolated small islands through anisotropic 1D stripes to larger 2D anisotropic islands and again randomly distributed single atoms. The transition is also marked in height–height correlation function dependence on temperature as directly seen by snapshots from simulations. The results are in good qualitative agreement with already published results of kinetic Monte Carlo simulations as well as with some experimental data.

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Vélez, José A., Georgios P. Tsoflias, Ross A. Black, Cornelis J. Van der Veen und Sridhar Anandakrishnan. „Distribution of preferred ice crystal orientation determined from seismic anisotropy: Evidence from Jakobshavn Isbræ and the North Greenland Eemian Ice Drilling facility, Greenland“. GEOPHYSICS 81, Nr. 1 (01.01.2016): WA111—WA118. http://dx.doi.org/10.1190/geo2015-0154.1.

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Preferred crystal orientation fabrics (COFs) within an ice sheet or glacier are typically found from ice cores. We conducted experiments at the North Greenland Eemian Ice Drilling (NEEM) facility ice core location, where COF data were available at Jakobshavn Isbræ west Greenland, to test if COF can be determined seismically. We used observations of anisotropic seismic wave propagation on multioffset gathers and englacial imaging from a 2D reflection profile. Anisotropy analysis of the NEEM data yielded mean c-axes distributed over a conical region of 30° to 32° from vertical. No internal ice seismic reflectors were imaged. Direct COF measurements collected in the ice core agreed with the seismic observations. At Jakobshavn Isbræ, we used a multioffset gather and a 2D reflection profile, but we lacked ice core data. Englacial reflectors allowed the determination of ice column interval properties. Anisotropy analysis found that the upper 1640 m of the ice column consisted of cold ([Formula: see text]) and mostly isotropic ice with c-axes distributed over a conical region of 80° from vertical. The lower 300 m of the ice column was characterized by warm ([Formula: see text]) ice with COF. These observations were consistent with complex ice fabric development and temperature estimations over the same region of Jakobshavn Isbræ. This study demonstrated that the ice sheet and glacier ice anisotropy information can be gained from seismic field observations.

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Mehr Quellen

Dissertationen zum Thema "Distributed anisotropy"

Cianci, Christopher Michael. „Distributed intelligent algorithms for robotic sensor networks monitoring discontinuous anisotropic environmental fields /“. Lausanne : EPFL, 2009. http://library.epfl.ch/theses/?nr=4247.

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Thèse Ecole polytechnique fédérale de Lausanne EPFL, no 4247 (2009), Faculté informatique et communications IC, Programme doctoral Informatique, Communications et Information, Institut des sciences et technologies de l'environnement ISTE (Laboratoire de systèmes et algorithmes intelligents distribués DISAL). Dir.: Alcherio Martinoli.

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Fooladi, Samaneh, und Tribikram Kundu. „Application of distributed point source method (DPSM) to wave propagation in anisotropic media“. SPIE-INT SOC OPTICAL ENGINEERING, 2017. http://hdl.handle.net/10150/625391.

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Distributed Point Source Method (DPSM) was developed by Placko and Kundu 1, as a technique for modeling electromagnetic and elastic wave propagation problems. DPSM has been used for modeling ultrasonic, electrostatic and electromagnetic fields scattered by defects and anomalies in a structure. The modeling of such scattered field helps to extract valuable information about the location and type of defects. Therefore, DPSM can be used as an effective tool for Non-Destructive Testing (NDT). Anisotropy adds to the complexity of the problem, both mathematically and computationally. Computation of the Green's function which is used as the fundamental solution in DPSM is considerably more challenging for anisotropic media, and it cannot be reduced to a closed-form solution as is done for isotropic materials. The purpose of this study is to investigate and implement DPSM for an anisotropic medium. While the mathematical formulation and the numerical algorithm will be considered for general anisotropic media, more emphasis will be placed on transversely isotropic materials in the numerical example presented in this paper. The unidirectional fiber-reinforced composites which are widely used in today's industry are good examples of transversely isotropic materials. Development of an effective and accurate NDT method based on these modeling results can be of paramount importance for in-service monitoring of damage in composite structures.

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Catapano, Anita. „Optimisation en Rigidité et Résistance de l'Anisotropie distribuée pour Structures Stratifiées“. Phd thesis, Université Pierre et Marie Curie - Paris VI, 2013. http://tel.archives-ouvertes.fr/tel-00952372.

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Cette thèse porte sur le développement d'une nouvelle stratégie pour l'analyse et la conception optimale de structures anisotropes par rapport à la rigidité et à la résistance. Nous considérons des structures avec une géométrie donné et caractérisés par un champ de rigidité et de résistance anisotropes et variables. Le travail a été divisé en trois parties. Dans la première partie nous présentons les différents concepts et instruments utilisé pour développer la recherche. Dans la deuxième partie nous proposons une formulation invariante, à travers la méthode polaire, de différents critères de rupture polynomiaux pour matériaux orthotropes. Cette formulation invariante a été utilisée, ensuite, pour résoudre le problème de déterminer l'orientation optimale de plis orthotropes afin de maximiser leur résistance. Dans la dernière partie de la thèse nous abordons le problème de la conception optimale de structures stratifiés. Notre approche est inspiré par une stratégie à deux étapes déjà existent pour la seule maximisation de la rigidité. Dans la première étape de la stratégie nous avons déterminé (à l'aide de trois algorithmes) la distribution optimale des paramètres matériaux d'une structure ayant géométrie donnée. Dans la deuxième étape nous avons résolu le problème de déterminer un empilement qui satisfait à la distribution optimale des paramètres matériaux trouvé à l'étape précédente. Pour ce qui concerne la première étape nous avons défini un nouveau critère de rupture par invariants valable pour un stratifié modelé comme une plaque homogène équivalente. Après, conscientes d'avoir deux fonctionnels à minimiser, l'énergie complémentaire pour maximiser la rigidité et l'indice de résistance du critère développé pour maximiser la résistance, nous avons formalisé le problème d'optimisation à travers une minimisation séquentielle des deux fonctionnels. Concernant la deuxième étape, nous avons utilisé une approche polaire-génétique pour le problème de conception du stratifié avec une phase de vérification sur la rupture du premier pli.

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Fischer, Jiří. „Analýza vlivu směrové distribuce kolagenních vláken ve stěně tepny na její mechanické vlastnosti“. Master's thesis, Vysoké učení technické v Brně. Fakulta strojního inženýrství, 2020. http://www.nusl.cz/ntk/nusl-418206.

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The aim of this thesis is to analyse literature with focusing on literature about directional distribution of collagen fibres. This knowledge is very important for computational modelling and FEM analysis of arterial wall. Comparison of suitability of different models of directional distribution of collagen fibres is made by fitting of different types of probability density functions. Impact assessment of different collagen fibres distribution on mechanical properties of the arterial wall and impact assessment of wall anisotropy is solved with finite element method. FEM analysis is done on three loading types – uniaxial tension, equibiaxial tension and inflation of artery by internal pressure. Output of this thesis is evaluation of results for various types of collagen fibres arrangement in arterial wall.

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Kubíčková, Lenka. „Relaxivita magnetických nanočástic oxidů železa obsahujících diamagnetické kationty“. Master's thesis, 2017. http://www.nusl.cz/ntk/nusl-355651.

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Magnetic nanoparticles have received extensive attention in the biomedical research, e.g. as prospective contrast agents for T2-weighted magnetic resonance imaging. The ability of a contrast agent to enhance the relaxation rate of 1 H in its vicinity is quantified by relaxivity. The main aim of this thesis is to evaluate the transversal re- laxivity of ε-Fe2−x Alx O3 nanoparticles coated with amorphous silica or citrate - its dependence on external magnetic field, temperature and thickness of silica coating - by means of nuclear magnetic resonance. The aluminium content x = 0.23(1) was determined from XRF, the material was further characterised by XRPD, Möss- bauer spectroscopy, DLS, TEM and magnetic measurements. The size of magnetic cores was ∼ 21 nm, the thickness of silica coating ∼ 6,10,17 and 21 nm. Magne- tization of the ε-Fe2−x Alx O3 nanoparticles increased by ∼ 30 % when compared to ε-Fe2O3. The saturating dependence of relaxivity on external magnetic field and on the linear decrease with increase of thickness of silica coating contravene the theo- retical model of motional averaging regime (MAR); nevertheless, the temperature dependence acquired in 0.47 T and 11.75 T may be explained by MAR. In compari- son to ε-Fe2O3 nanoparticles, the relaxivity of examined samples was higher for par-...

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Jacq, Pascal. „Méthodes numériques de type Volumes Finis sur maillages non structurés pour la résolution de la thermique anisotrope et des équations de Navier-Stokes compressibles“. Phd thesis, 2014. http://tel.archives-ouvertes.fr/tel-01067707.

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Lors de la rentrée atmosphérique nous sommes amenés à modéliser trois phénomènes physiques différents. Tout d'abord, l'écoulement autour du véhicule entrant dans l'atmosphère est hypersonique, il est caractérisé par la présence d'un choc fort et provoque un fort échauffement du véhicule. Nous modélisons l'écoulement par les équations de Navier-Stokes compressibles et l'échauffement du véhicule au moyen de la thermique anisotrope. De plus le véhicule est protégé par un bouclier thermique siège de réactions chimiques que l'on nomme communément ablation.

Dans le premier chapitre de cette thèse nous présentons le schéma numérique de diffusion CCLAD (Cell-Centered LAgrangian Diffusion) que nous utilisons pour résoudre la thermique anisotrope. Nous présentons l'extension en trois dimensions de ce schéma ainsi que sa parallélisation.
Nous continuons le manuscrit en abordant l'extension de ce schéma à une équation de diffusion tensorielle. Cette équation est obtenue en supprimant les termes convectifs de l'équation de quantité de mouvement des équations de Navier-Stokes. Nous verrons qu'une pénalisation doit être introduite afin de pouvoir inverser la loi constitutive et ainsi appliquer la méthodologie CCLAD. Nous présentons les propriétés numériques du schéma ainsi obtenu et effectuons des validations numériques.
Dans le dernier chapitre, nous présentons un schéma numérique de type Volumes Finis permettant de résoudre les équations de Navier-Stokes sur des maillages non-structurés obtenu en réutilisant les deux schémas de diffusion présentés précédemment.

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Buchteile zum Thema "Distributed anisotropy"

Rand, Omri, und Vladimir Rovenski. „Anisotropic Elastic Beams With Axially Distributed Loads“. In Solid Mechanics and Its Applications, 269–83. Dordrecht: Springer Netherlands, 2009. http://dx.doi.org/10.1007/978-90-481-3467-0_21.

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Telega, Józef Joachim, und Włodzimierz Robert Bielski. „Exact controllability of anisotropic elastic bodies“. In Modelling and Optimization of Distributed Parameter Systems Applications to engineering, 254–62. Boston, MA: Springer US, 1996. http://dx.doi.org/10.1007/978-0-387-34922-0_26.

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M., Lakshmi Priya, und Lalit K. Awasthi. „Distributed Localization for Anisotropic Sensor Networks Using Spatial Clustering“. In Lecture Notes in Computer Science, 375–80. Berlin, Heidelberg: Springer Berlin Heidelberg, 2012. http://dx.doi.org/10.1007/978-3-642-29280-4_44.

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Goloveshkina, Evgeniya V., und Leonid M. Zubov. „Nonlinear Deformations of Anisotropic Elastic Bodies with Distributed Dislocations“. In Advanced Structured Materials, 119–38. Cham: Springer International Publishing, 2023. http://dx.doi.org/10.1007/978-3-031-28744-2_7.

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Flores, Marco Antonio Ameller, und Angélica González Arrieta. „Fingerprint Orientation Field Estimation Using ROEVA (Ridge Orientation Estimation and Verification Algorithm) and ADF (Anisotropic Diffusion Filtering)“. In Distributed Computing and Artificial Intelligence, 13th International Conference, 265–73. Cham: Springer International Publishing, 2016. http://dx.doi.org/10.1007/978-3-319-40162-1_29.

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Ehret, A. E., M. Itskov und G. Weinhold. „A Viscoelastic Anisotropic Model for Soft Collageneous Tissues Based on Distributed Fiber–Matrix Units“. In IUTAM Symposium on Cellular, Molecular and Tissue Mechanics, 55–65. Dordrecht: Springer Netherlands, 2009. http://dx.doi.org/10.1007/978-90-481-3348-2_5.

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Rossikhin, Yury A., und Marina V. Shitikova. „Harmonic Waves in an Anisotropic Medium Generated by Heat Sources Distributed Along the Plane“. In Encyclopedia of Thermal Stresses, 2120–34. Dordrecht: Springer Netherlands, 2014. http://dx.doi.org/10.1007/978-94-007-2739-7_939.

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Kühn, Martin. „Parallelization of an Edge- and Coherence-Enhancing Anisotropic Diffusion Filter with a Distributed Memory Approach Based on GPI“. In Competence in High Performance Computing 2010, 99–110. Berlin, Heidelberg: Springer Berlin Heidelberg, 2011. http://dx.doi.org/10.1007/978-3-642-24025-6_9.

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Balakrishnan, A. V. „Dynamics and Control of Articulated Anisotropic Timoshenko Beams“. In Dynamics and Control of Distributed Systems, 121–201. Cambridge University Press, 1998. http://dx.doi.org/10.1017/cbo9780511530180.005.

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Yuzevych, Volodymyr, und Bohdan Koman. „MATHEMATICAL AND COMPUTER MODELING OF INTERPHASE INTERACTION IN HETEROGENEOUS SOLID STRUCTURES“. In Theoretical and practical aspects of the development of modern scientific research. Publishing House “Baltija Publishing”, 2022. http://dx.doi.org/10.30525/978-9934-26-195-4-14.

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The aim of this work was to develop a mathematical model and computer modelling of interphase interaction, mechanical stresses and adhesion mechanisms between mechanically inhomogeneous media (different phases). Methodology. For the system "metal – dielectric" we use a macroscopic approach, which corresponds to the ratio of non-equilibrium thermodynamics and physics of solid surfaces. Let’s consider the system of equations and boundary conditions for describing the change of energy parameters (σh, γ), which characterize the thermodynamic state of the system of contacting bodies. Method for calculating the main energy parameters (interfacial energy – γm, interfacial tension – σm, work of adhesion – Aadand energy of adhesive bonds – γad) in complex solid-state structures containing boundary phases is proposed. Based on the basic equations of nonequilibrium thermodynamics and surface physics a mathematical model of the interphase boundary is designed. A comparative analysis of the features of interphase interaction in the systems "metal-metal", "metal-semiconductor" and "metal-dielectric" on the example of interacting systems "Cu – Zn", "Cu – Si" and "Cu – quartz". It is established that the most sensitive parameter in the analysis of interphase interactions is the interphase energy γm.A model of mechanical stress formation in the "condensate-substrate" system is proposed. In particular, internal stresses in metal condensates are caused by changes in the value of interphase energy parameters (primarily interfacial tension) in the substrate-nanocondensate system and due to phase-forming processes accompanied by changes in surface energy in the condensate volume during its formation. The resulting internal stresses in metal condensates are an integral result of the action of statistically distributed on the plane of the film local stresses. Such phenomena are due to the anisotropy of the energy parameters of the interphase interaction in the condensate plane. Behavior analysis of energy and adhesion parameters can be used to predict the results of interphase interaction in order to select contact pairs to create thermodynamically stable structures with predicted values of energy parameters of interphase interaction, a certain type of chemical bond and a given level of mechanical stresses.

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Konferenzberichte zum Thema "Distributed anisotropy"

McCabe, K., und R. N. Horne. „Estimating Permeability Anisotropy From Downhole Distributed Temperature Measurements“. In SPE Annual Technical Conference and Exhibition. Society of Petroleum Engineers, 2015. http://dx.doi.org/10.2118/174972-ms.

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Sanchez, Darryl J., Denis W. Oesch und Patrick R. Kelly. „Use of anisotropy data to gauge Kolmogarity – Application is made to the RAHCL experiment“. In Propagation through and Characterization of Distributed Volume Turbulence and Atmospheric Phenomena. Washington, D.C.: OSA, 2015. http://dx.doi.org/10.1364/pcdvtap.2015.pt4c.3.

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Yu, Hui-Chia, und Wei Lu. „Self-Assembly of Nanovoids in Solids“. In ASME 2004 International Mechanical Engineering Congress and Exposition. ASMEDC, 2004. http://dx.doi.org/10.1115/imece2004-60008.

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Experiments show that vacancies in a solid may coalesce into voids and self-organize into a super-lattice. The voids have diameters around 10 nm and spacing of tens of nanometers. This paper develops a thermodynamic model to explain and simulate the remarkable phenomena. We incorporate free energy of mixing, interface energy and elasticity into a continuous phase field model. It is well known that the total interface energy reduces when the voids grow larger. Simulations show that elastic anisotropy may limit the coarsening. Starting from randomly distributed vacancies, the process of coalescence and void lattice formation demonstrates rich dynamics. Long-range elastic interaction and elastic anisotropy are found to play a significant role that determines the self-assembled super-lattice.

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Salac, David, und Wei Lu. „Irradiiaton-Induced Defect Self-Organizatoin“. In ASME 2005 International Mechanical Engineering Congress and Exposition. ASMEDC, 2005. http://dx.doi.org/10.1115/imece2005-81339.

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Keskinen, Erno, Michel Cotsaftis und Matti Martikainen. „Half-Critical Response of Cylindrical Rotor to Distributed Elasticity Excitation“. In ASME 2005 International Design Engineering Technical Conferences and Computers and Information in Engineering Conference. ASMEDC, 2005. http://dx.doi.org/10.1115/detc2005-85365.

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Due to the limitations of manufacturing accuracy, long cylindrical rotors used in heavy power transmission lines and paper machinery are dynamically excited by internal elastic forces. The origin of these forces is the out-of-roundness profile of the inner and outer radii of the rotor, which contributes to the bending stiffness distribution along the rotor span. Distributed anisotropy of the rotor under gravitational load is reason of the existence of half-critical speeds, on which the rotor experiences non-classical resonance state. This problem has been formulated in terms of nominal and deviated motion according to the splitting of the bending stiffness tensor in a similar way. This leads to a static rotor equation, whose amplification effect on to the dynamic part of the motion has been analyzed in details. This includes formal solution of the resulting dynamic Hill equation in terms of the modal coordinates of the corresponding free whirling Rayleigh beam.

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Hervin, Flora, und Paul Fromme. „Directionally Dependent Guided Wave Scattering for the Monitoring of Anisotropic Composite Structures“. In 2022 49th Annual Review of Progress in Quantitative Nondestructive Evaluation. American Society of Mechanical Engineers, 2022. http://dx.doi.org/10.1115/qnde2022-98367.

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Abstract Carbon fiber composite laminates, consisting of highly anisotropic ply layers, are widely used in aerospace structures due to their good strength to weight ratio. However, due to poor interlaminar strength, composite components are prone to barely visible impact damage during aircraft operation. Sparse array guided wave imaging, using a network of distributed sensors, is an important Structural Health Monitoring (SHM) tool for the detection and localization of in-service damage in composite structures. However, the anisotropy of composite laminates influences guided wave scattering, impacting imaging performance. Defect characterization can be improved by considering the scattering characteristics of various damage types for the sparse array signal processing. Guided wave scattering (A0 Lamb wave mode) was investigated around an artificial insert delamination in a quasi-isotropic carbon fiber reinforced polymer (CFRP) panel. Permanent magnets, mounted on an undamaged region of the plate, were also used as scattering targets and compared to the delamination case. Full 3D Finite Element (FE) simulations were performed for both the delamination and magnet cases and compared to wavefield data obtained from non-contact laser measurements. Good agreement was found between the experimental measurements and simulations. Scattered guided wave amplitudes around each damage type show strong directional dependency with energy focusing along the fiber directions of the outer ply layers of the laminate. Distinct scattering behavior was observed for each damage type. A forward scattered wave was observed for the delamination, whereas the magnet blocked forward wave transmission. Implications of anisotropy and angular scattering on sparse array SHM of different defect types are discussed.

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Paddon, P., E. Sjerve und G. M. Stephan. „Stability of polarized modes in a strongly anisotropic laser cavity“. In OSA Annual Meeting. Washington, D.C.: Optica Publishing Group, 1993. http://dx.doi.org/10.1364/oam.1993.wss.7.

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Previous calculations of the stability of the polarization modes of lasers, including their stability, bistability and curious catastrophes1,2 have invoked the mean field approximation. Since the cavity anisotropies and losses are approximated by distributed quantities, the polarization of the laser is the same throughout the cavity. In general then, one expects such an approximation to be valid only for cavities with small anisotropies. Such cavities are appropriately described as quasi–isotropic. We have succeeded in breaking this mean field approximation by propagating a plane wave around a linear cavity with strong optical anisotropies and a saturable gain medium. The calculations allow for the modification, of the saturation induced anisotropy, due to distinct states of polarization for the forward and backward propagating fields. Results are presented both for strongly anisotropic cavities and for quasi-isotropic cavities where mean field and non mean field calculations may be compared. This work was supported by the Natural Sciences and Engineering Research Council of Canada and the Province of Ontario through the Ontario Laser and Lightwave Research Centre.

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Yao, Xiao, Zeng Qinggao, Deng Haibo, Song Linke, Liu Xinggang, Heng Haiyan, Zhang Wenjing et al. „Tight Gas Reservoir Characterization and Comparison of PLT Methods: Micro-Seismic Monitoring, Fiber Optical Production Logging and Tracer Coated Sand Monitoring Applied in the Same Well“. In ADIPEC. SPE, 2023. http://dx.doi.org/10.2118/216139-ms.

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Abstract Unconventional tight gas reservoir characterization is a complex process in continuous attempt to optimize hydrocarbon recovery. The production logging tools and formation evaluation tools currently existing in the market gained widespread adoption in conventional plays. Unconventional reservoirs are characterized with complex lithology, high heterogeneity and anisotropy. Typically, such reservoirs are developed by drilling clustered horizontal wells deploying multistage frac strategy to increase reservoir drainage and simulated reservoir volume (SRV). Accurate reservoir characterization is key to reduce uncertainties and economic feasibility of field developments. Operators are continuously looking to define reliable production logging tools for unconventional plays. This paper evaluates the comparison of three different measurement methods in the horizontal well straight after performing 15-stage hydraulic fracturing. The measurement methods in subject are: micro-seismic monitoring of neighboring wells, coiled tubing conveyed distributed acoustic sensing (DAS) and novel quantum based inflow tracers. Inflow tracer technology is fairly new solution and as such, will be elaborated in greater detail compared to the other two solutions.

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Mayeur, J. R., D. L. McDowell und R. W. Neu. „Effect of Crystallographic Texture on Deformation Fields in Fretting Contacts“. In World Tribology Congress III. ASMEDC, 2005. http://dx.doi.org/10.1115/wtc2005-63536.

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Fretting contacts in the partial slip regime are simulated by a finite element model of a rigid cylinder on an elastic-crystal viscoplastic half-space. The half-space is modeled as duplex Ti-6Al-4V, a polycrystalline metal alloy consisting of equiaxed primary alpha grains and secondary lamellar alpha+beta grains. Various realistic 3-D crystallographic textures are considered. The deformation fields generated by fretting are quantified in terms of cumulative effective plastic strain distributions and plastic strain maps. The results clearly demonstrate the importance of the various sources of microstructural heterogeneity in the surface layers. The main sources of microstructural heterogeneity include the distribution of phases, slip system strength anisotropy, and crystallographic texture. In basal textured materials with fretting on the edge, the plastic strain is more evenly distributed in the subsurface regions than in other textured cases. This is explained by the greater number of grains able to deform by soft slip modes and the symmetry of this type of texture relative to the fretting orientation. Transverse and basal/transverse textures result in more heterogeneously-distributed plastic strain with strain often concentrated in narrow vein-like structures with maximum accumulation near alpha/alpha+beta grain boundaries. Elastic shakedown is more difficult to achieve in the later case. Ratcheting is the primary mechanism for cyclic plastic strain accumulation.

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Kumar, Rajeev, und Pierre Bettinelli. „Borehole Seismic: Essential Contributions Over the Oilfield Lifecycle“. In SPE Middle East Oil & Gas Show and Conference. SPE, 2021. http://dx.doi.org/10.2118/204889-ms.

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Abstract During the evolution of the petroleum industry, surface seismic imaging has played a critical role in reservoir characterization. In the early days, borehole seismic (BHS) was developed to complement surface seismic. However, in the last few decades, a wide range of BHS surveys has been introduced to cater to new and unique objectives over the oilfield lifecycle. In the exploration phase, vertical seismic profiling (VSP) provides critical time-depth information to bridge time indexed subsurface images to log/reservoir properties in depth. This information can be obtained using several methods like conventional wireline checkshot or zero-offset vertical seismic profiling (ZVSP), seismic while drilling (SWD) or distributed acoustic sensing (DAS) techniques. SWD is a relatively new technique to record real-time data using tool deployed in the bottomhole assembly without disturbing the drilling. It helps to improve decision making for safer drilling especially in new areas in a cost-effective manner. Recently, a breakthrough technology, distributed acoustic sensing (DAS), has been introduced, where data are recorded using a fiber-optic cable with lots of saving. ZVSP also provides several parameters like, attenuation coefficient (Q), multiples prediction, impedance, reflectivity etc., which helps with characterizing the subsurface and seismic reprocessing. In the appraisal phase, BHS applications vary from velocity model update, anisotropy estimation, well- tie to imaging VSPs. The three-component VSP data is best suited for imaging and amplitude variation with offset (AVO) due to several factors like less noise interference due to quiet downhole environment, higher frequency bandwidth, proximity to the reflector, etc. Different type of VSP surveys (offset, walkaway, walkaround etc.) were designed to fulfill objectives like imaging, AVO, Q, anisotropy, and fracture mapping. In the development phase, high-resolution images (3D VSP, walkaway, or crosswell) from BHS surveys can assist with optimizing the drilling of new wells and, hence reduce costs. it can help with landing point selection, horizontal section placement, and refining interpretation for reserve calculation. BHS offers a wide range of surveys to assist the oilfield lifecycle during the production phase. Microseismic monitoring is an industry-known service to optimize hydraulic fracturing and is the only technique that captures the induced seismicity generated by hydraulic fracturing and estimate the fracture geometry (height, width, and azimuth) and in real time. During enhanced oil recovery (EOR) projects, BHS can be useful to optimize the hydrocarbon drainage strategies by mapping the fluid movement (CO2, water, steam) using time-lapse surveys like walkaway, 3D VSP and/or crosswell. DAS has brought a new dimension to provide vital information on injection or production evaluation, leak detection, flow behind tubing, crossflow diagnosis, and cement evaluation during production phase. This paper highlights the usage of BHS over the lifecycle of the oilfield.

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Berichte der Organisationen zum Thema "Distributed anisotropy"

Choudhury, Sarah, Ross Underhill und Thomas Krause. PR-652-203801-R04 Magnetometer Noise and Resolution. Chantilly, Virginia: Pipeline Research Council International, Inc. (PRCI), November 2021. http://dx.doi.org/10.55274/r0012196.

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Magnetometers are sensors that measure the magnitude and direction of a magnetic field. There are many types of magnetometers available, but they all rely on electromagnetic principles to measure fields. The most common types are Hall effect, anisotropic magneto-resistive (AMR) and fluxgate sensors. The goal of this study is to investigate several magnetometers to evaluate their capability to detect small changes in an ambient field. These small changes are on the order of 10 milligauss (1 �T) and are caused by the inverse-magnetostrictive effect, or Villari effect, from ferromagnetic pipes. The chosen magnetometer must have a low noise signal and a fine resolution to properly measure the field from the inverse-magnetostrictive effect. To evaluate the chosen magnetometers, multiple sets of measurements were made in a stationary magnetic field and the standard deviation of the data sets were calculated. The noise of some sensors was further investigated to verify that it was normally distributed.

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