Готові списки джерел за темами / Longitudinal-transverse splitting

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Добірка наукової літератури з теми "Longitudinal-transverse splitting"

Автор: Grafiati

Опубліковано: 30 травня 2022

Оновлено: 31 травня 2022

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Статті в журналах з теми "Longitudinal-transverse splitting"

Логинов, Д. К., та А. В. Донец. "Зависимость продольно-поперечного расщепления экситона в квантовой яме от внешнего однородного электрического поля". Физика твердого тела 62, № 2 (2020): 208. http://dx.doi.org/10.21883/ftt.2020.02.48869.599.

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In our paper theoretical analyzed the decreasing of transverse-longitudinal splitting of an exciton in the GaAs/AlGaAs quantum well in the homogeneous electric field. Also the dependence of the splitting on application field is calculated. The excitonic reflectance spectra of the thick quantum well are calculated for field directed transversal to well layer. The decreasing of reflectance oscillation in the excitonic spectra because of decreasing transverse-longitudinal splitting is demonstrated.

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Burak, Ya V., Ya O. Dovgii, and I. V. Kityk. "Longitudinal-transverse splitting of phonon modes in Li2B4O7 crystals." Journal of Applied Spectroscopy 52, no. 1 (January 1990): 97–100. http://dx.doi.org/10.1007/bf00664791.

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Andreani, L. C., F. Bassani, and A. Quattropani. "Longitudinal-transverse splitting in Wannier excitons and polariton states." Il Nuovo Cimento D 10, no. 12 (December 1988): 1473–86. http://dx.doi.org/10.1007/bf02454213.

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Eda, Kazuo. "Longitudinal-transverse splitting effects in IR absorption spectra of MoO3." Journal of Solid State Chemistry 95, no. 1 (November 1991): 64–73. http://dx.doi.org/10.1016/0022-4596(91)90376-s.

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Vdovych, A. S. "Longitudinal and Transverse Electrocaloric Effects in Glycinium Phosphite Ferroelectric." Ukrainian Journal of Physics 66, no. 5 (May 28, 2021): 412. http://dx.doi.org/10.15407/ujpe66.5.412.

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A modified proton ordering model of glycinium phosphite ferroelectric, which involves the piezoelectric coupling of the proton and lattice subsystems, is used for the investigation of the electrocaloric effect. The model also accounts for the dependence of the effective dipole moment on a hydrogen bond on an order parameter, as well as a splitting of parameters of the interaction between pseudospins in the presence of shear stresses. In the two-particle cluster approximation, the influence of longitudinal and transverse electric fields on components of the polarization vector and the dielectric permittivity tensor, as well as on thermal characteristics of the crystal, is calculated. Longitudinal and transverse electrocaloric effects are studied. The calculated electrocaloric temperature change is quite small, about 1K; however, it can change its sign under the influence of a transverse field.

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Yu, Yang, and Jian-Feng Li. "The constraint equation of the vertex function of quantum anomaly and Dyson–Schwinger equations in massless QED2 theory." Modern Physics Letters A 35, no. 18 (May 26, 2020): 2050146. http://dx.doi.org/10.1142/s0217732320501461.

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In this paper, we calculate the quantum anomaly for the longitudinal and the transverse Ward–Takahashi (WT) identities for vector and axial-vector currents in QED2 theory by means of the point-splitting method. It is found that the longitudinal WT identity for vector current and transverse WT identity for axial-vector current have no anomaly while the longitudinal WT identity for axial-vector current and the transverse WT identity for vector current have anomaly in QED2 theory. Moreover, we study the four WT identities in massless QED2 theory and get the result that the four WT identities together give the constraint equation of the vertex function of quantum anomaly. At last, we discuss the Dyson–Schwinger equations in massless QED2 theory. It is found that the vertex function of the quantum anomaly has corrections for the fermion propagator and Schwinger model.

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Ivchenko, E. L., V. P. Kochereshko, P. S. Kop'ev, V. A. Kosobukin, I. N. Uraltsev, and D. R. Yakovlev. "Exciton longitudinal-transverse splitting in GaAs/AlGaAs superlattices and multiple quantum wells." Solid State Communications 70, no. 5 (May 1989): 529–34. http://dx.doi.org/10.1016/0038-1098(89)90944-7.

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Maringa, Maina, and LM Masu. "The effects of different fibre packing geometries on the transverse matrix strain magnification and fibre strain reduction in uniaxially aligned continuous fibre-reinforced composites." Journal of Composite Materials 50, no. 29 (July 28, 2016): 4159–70. http://dx.doi.org/10.1177/0021998316631701.

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Expressions for transverse matrix strain magnification and fibre strain reduction are derived for square and hexagonal fibre array reinforced composites. Respective transverse matrix and fibre strain magnification and reduction, for the square arrays are shown to be higher for all reinforcing fibre volume fractions than those for the hexagonal arrays. The respective magnification and reduction of the transverse matrix and fibre strains are shown to decrease with increasing values of the ratio of elastic modulus ( Em/ Ef) for both reinforcing fibre arrays. The magnified transverse matrix strains in axially loaded longitudinally aligned continuous fibre-reinforced composites are shown to be higher than the applied longitudinal strains for all square array reinforcing fibre volume fractions and for all hexagonal array reinforcing fibre volumes fractions above 31%. This raises possibilities of longitudinal matrix splitting before interfacial bond failure and transverse matrix failure, in a strain based rather than stress-based failure mode.

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Yamamoto, Kiyoshi, and Akio Masui. "TO-LO Splitting in Infrared Spectra of Thin Films." Applied Spectroscopy 50, no. 6 (June 1996): 759–63. http://dx.doi.org/10.1366/0003702963905709.

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The importance of transverse optic-longitudinal optic (TO-LO) splitting in the interpretation of infrared spectra of thin films is experimentally presented. When infrared spectra are observed at oblique angles of incidence, the shifts in peak position and/or the changes in peak shape may be due to TO-LO splitting. Before one assigns the optical behavior to surface phenomena such as molecular orientation, proper care must be employed. The proposed technique includes optical calculation to extract surface phenomena from TO-LO splitting in the spectra, and it is applied to reflection absorption spectra of perfluoropolyether.

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Bobrysheva, A. I., and W. M. Shvera. "The Influence of the Excitonic Longitudinal-Transverse Splitting on the Biexciton Binding Energy." physica status solidi (b) 132, no. 2 (December 1, 1985): K107—K110. http://dx.doi.org/10.1002/pssb.2221320248.

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Більше джерел

Дисертації з теми "Longitudinal-transverse splitting"

Piotter, Jason Matthew. "Longitudinal Slab Splitting in Composite Girders." Thesis, Virginia Tech, 2001. http://hdl.handle.net/10919/31765.

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Longitudinal slab splitting in composite hot rolled girders and joist girders was investigated. Two different type of framing configurations were studied with two tests conducted per configuration. The framing configurations were designated as either flush-framed or haunched, which describes the framing of the joists into the joist girders or H-shape. Each floor system consisted of at least one exterior or spandrel joist girder, one interior joist girder, and in three of the four tests, an exterior or spandrel H-shape. The nominal lengths of the girders were 30 ft 4 in. with a centerline spacing of 7 ft for the flush-framed tests and 6 ft 9 in. for the haunch tests. Varying amounts of transverse reinforcement were used in the slab over each girder. Shear connectors were all 0.75 in. diameter headed shear studs of varying lengths. The results of these tests were used to determine the minimum amount of transverse reinforcement required to prevent longitudinal splitting from controlling the strength of the section. A comparative analytical study was performed to generate a design procedure for determining the appropriate amount of transverse reinforcement. This consisted of adapting existing procedures in reinforced concrete for similar shear problems and generating alternative procedures based on existing research for composite construction. Results from these methods were then calibrated against experimental data obtained in this study.
Master of Science

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Ogurtsov, Alexander, Olga Bliznjuk, and Nataliia Masalitina. "Crystal size effect in polaritonic luminescence from atomic cryocrystals." Thesis, Hyogo University, 2019. http://repository.kpi.kharkov.ua/handle/KhPI-Press/44703.

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Mehmani, Yashar. "Modeling single-phase flow and solute transport across scales." Thesis, 2014. http://hdl.handle.net/2152/28475.

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Flow and transport phenomena in the subsurface often span a wide range of length (nanometers to kilometers) and time (nanoseconds to years) scales, and frequently arise in applications of CO₂ sequestration, pollutant transport, and near-well acid stimulation. Reliable field-scale predictions depend on our predictive capacity at each individual scale as well as our ability to accurately propagate information across scales. Pore-scale modeling (coupled with experiments) has assumed an important role in improving our fundamental understanding at the small scale, and is frequently used to inform/guide modeling efforts at larger scales. Among the various methods, there often exists a trade-off between computational efficiency/simplicity and accuracy. While high-resolution methods are very accurate, they are computationally limited to relatively small domains. Since macroscopic properties of a porous medium are statistically representative only when sample sizes are sufficiently large, simple and efficient pore-scale methods are more attractive. In this work, two Eulerian pore-network models for simulating single-phase flow and solute transport are developed. The models focus on capturing two key pore-level mechanisms: a) partial mixing within pores (large void volumes), and b) shear dispersion within throats (narrow constrictions connecting the pores), which are shown to have a substantial impact on transverse and longitudinal dispersion coefficients at the macro scale. The models are verified with high-resolution pore-scale methods and validated against micromodel experiments as well as experimental data from the literature. Studies regarding the significance of different pore-level mixing assumptions (perfect mixing vs. partial mixing) in disordered media, as well as the predictive capacity of network modeling as a whole for ordered media are conducted. A mortar domain decomposition framework is additionally developed, under which efficient and accurate simulations on even larger and highly heterogeneous pore-scale domains are feasible. The mortar methods are verified and parallel scalability is demonstrated. It is shown that they can be used as “hybrid” methods for coupling localized pore-scale inclusions to a surrounding continuum (when insufficient scale separation exists). The framework further permits multi-model simulations within the same computational domain. An application of the methods studying “emergent” behavior during calcite precipitation in the context of geologic CO₂ sequestration is provided.
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Частини книг з теми "Longitudinal-transverse splitting"

Kanehisa, M. A. "K-Dependent Longitudinal-Transverse Splitting in CuCl." In Proceedings of the 17th International Conference on the Physics of Semiconductors, 1263–66. New York, NY: Springer New York, 1985. http://dx.doi.org/10.1007/978-1-4615-7682-2_286.

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Bobrysheva, A. I., and Yu M. Shvera. "The Influence of the Excitonic Longitudinal-Transverse Splitting on the Biexciton Binding Energy." In December 1, 687–90. De Gruyter, 1985. http://dx.doi.org/10.1515/9783112495445-047.

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Тези доповідей конференцій з теми "Longitudinal-transverse splitting"

XUE, JING, and KEDAR KIRANE. "STRENGTH SIZE EFFECT IN FIBER COMPOSITES FAILING UNDER LONGITUDINAL AND TRANSVERSE COMPRESSION." In Thirty-sixth Technical Conference. Destech Publications, Inc., 2021. http://dx.doi.org/10.12783/asc36/35873.

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The size effect in the structural strength of fiber reinforced composites has been typically analyzed for tensile failures. However, this is not true for the equally important compressive failures, primarily due to the difficulties in conducting compression tests on specimens of multiple sizes. These size effects are analyzed here numerically for two important compressive failure mechanisms in composites, viz. (i) fiber kink bands forming under longitudinal compression (typically accompanied by axial splitting matrix cracks) and (ii) inclined shear cracks forming under transverse compression. The former mechanism is modeled by a semi-multiscale microplane model, while the latter by the fixed crack model. Both models are calibrated and verified using available test data on carbon fiber composites and then used to predict the failure and load bearing capacities of geometrically scaled pre-cracked specimens of different sizes. In all cases, the predicted failure is found to be of a propagating nature, accompanied by release of strain energy from the specimen causing a distinct size effect in the nominal strength. For the composite considered here, under longitudinal compression, the fracture process zone (FPZ) is found to be fairly small (<1 mm) and the strength size effect is seen to follow linear elastic fracture mechanics (LEFM). The size effect deviates from LEFM for smaller specimen sizes due to increased flaw size insensitivity but cannot be fitted by Bažant's size effect law since the geometric similarity of the failure mode is lost. On the other hand, under transverse compression the FPZ is found to be much larger (34 to 42 mm) and the size effect is found to obey Bažant's size effect law, deviating from LEFM. The failure is geometrically similar despite being inclined to the pre-crack. These findings provide evidence of the general applicability of fracture mechanics-based size effect laws to compressive failure in fiber composites, and prompt suitable experimental investigations.

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Gu, Yunfeng, Zhonghua Ni, Minhua Chen, Kedong Bi, and Yunfei Chen. "The Phonon Thermal Conductivity of a Single-Layer Graphene From Complete Phonon Dispersion Relations." In ASME 2010 International Mechanical Engineering Congress and Exposition. ASMEDC, 2010. http://dx.doi.org/10.1115/imece2010-39645.

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In this paper, the phonon scattering mechanisms of a single layer graphene are investigated based on the complete phonon dispersion relations. According to the selection rules that a phonon scattering process should obey the energy and momentum conservation conditions, the relaxation rates of combing and splitting Umklapp processes can be calculated by integrating the intersection lines between different phonon mode surfaces in the phonon dispersion relation space. The dependence of the relaxation rates on the wave vector directions is presented with a three dimensional surfaces over the first Brillion zone. It is found that the reason for the optical phonons contributing a little to heat transfer is attributed to the strong Umklapp processes but not to their low group velocities. The combing Umklapp scattering processes involved by the optical phonons mainly decrease the acoustic phonon thermal conductivity, while the splitting Umklapp scattering processes of the optical phonons mainly restrict heat conduction by the optical phonons themselves. Neglecting the splitting processes, the optical phonons can contribute more energy than that carried by the acoustic phonons. Based on the calculated phonon relaxation time, the thermal conductivities contributed from different mode phonons can be evaluated. At low temperatures, both longitudinal and in-plane transverse acoustic phonon thermal conductivities have T2 temperature dependence, and the out-of-plane transverse acoustic phonon thermal conductivity is proportion to T3/2. At room temperature, the calculated thermal conductivity is on the order of a few thousands W/m.K depending on the sample size and the edge roughness, which is in agreement with the recently measured data.

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Gervasyev, Alexey, Roumen Petrov, Igor Pyshmintsev, Alexey Struin, and Brian Leis. "Mechanical Properties Anisotropy in X80 Line Pipes." In 2016 11th International Pipeline Conference. American Society of Mechanical Engineers, 2016. http://dx.doi.org/10.1115/ipc2016-64695.

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The anisotropy of tensile properties and impact toughness of X80 ferrite-bainite pipeline steels was investigated. The lowest strength values were found in longitudinal (L) direction, medium — in the direction of wall thickness (Z-direction), the highest — in transverse (T) direction. The anisotropy of the tensile properties is low and does not change significantly with the test temperature. The maximum variation in yield stress and tensile stress do not exceed the ranges of 100 MPa and 50 MPa respectively. The anisotropy in toughness is more clearly pronounced. Impact toughness in both T and L directions is more than 250 J/cm2 at minus 20°C while in Z-direction it is less than 30 J/cm2 at the same temperature. Low Z-direction toughness determines the susceptibility of steel to splitting during ductile fracture propagation (formation of brittle cracks parallel to the rolling plane of the plate). Microstructure and crystallographic texture analyses showed that the susceptibility to splitting is controlled by a number of factors like the predominant orientation of cleavage crystallographic planes parallel to the rolling plane, morphology of the microstructure elements, and the distribution of “second” phases.

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Price, Stuart J., Michael P. Pai¨doussis, and Srikanth Krishnamoorthy. "Cross-Flow Past a Pair of Staggered Cylinders With the Upstream Cylinder Subjected to a Transverse Harmonic Oscillation." In ASME 2006 Pressure Vessels and Piping/ICPVT-11 Conference. ASMEDC, 2006. http://dx.doi.org/10.1115/pvp2006-icpvt-11-93146.

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The results of an experimental investigation are presented for the cross-flow past a pair of staggered circular cylinders, with the upstream cylinder being subject to forced harmonic oscillation transverse to the flow direction. Flow-visualization of the wake-formation region and hot-film measurements of the wake spectra are reported. Experiments were conducted in a water tunnel for Reynolds numbers, based on upstream velocity, U, and cylinder diameter, D, in the range 1440 ≤ Re ≤ 1680. Results are presented for the case where the longitudinal separation between cylinder centres (for the mean position of the upstream cylinder) is L/D = 2.0, with the transverse separation being T/D = 1.0. As shown by Sumner et al. [1] this configuration corresponds to either the gap vortex pairing and enveloping or gap vortex pairing, splitting and enveloping regimes. The results show that the oscillation of the upstream cylinder causes considerable modification of the flow patterns and regimes compared to what is obtained when the cylinder is fixed. In particular, depending on the frequency of oscillation of the upstream cylinder, sub- and super-harmonic resonances are obtained between the vortex formation frequency and oscillation frequency, as well as the usual fundamental lock-in. These resonances and accompanying wake regimes are examined in detail in the paper.

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