Articoli di riviste: "Elastic optical systems"

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Díaz-de-Anda, A., J. Flores, L. Gutiérrez, R. A. Méndez-Sánchez, G. Monsivais e A. Morales. "Emergence of acoustic and optical bands in elastic systems". Journal of the Acoustical Society of America 134, n. 6 (dicembre 2013): 4393–400. http://dx.doi.org/10.1121/1.4828822.

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Giamarchi, T., R. Chitra e P. Le Doussal. "Disordered elastic systems and electronic crystals". Journal de Physique IV 12, n. 9 (novembre 2002): 277–82. http://dx.doi.org/10.1051/jp4:20020415.

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Electrons can crystallize to form a Wigner crystal. This crystallization is particularly effective in two dimensions. The effect of disorder on such electronic crystals can be taken into account using the same techniques and concepts, in particular the notion of Bragg glass phase, than the one developed to tackle classical disordered elastic systems. We analyze the properties of such a disordered Wigner crystal and discuss the physical consequences, both for the thermodynamics (compressibility etc.) and for the transport properties. This approach allows a good description of the optical conductivity and in particular to obtain correctly the density and field dependence of the pinning frequency. Relevance to experimental systems is discussed.

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Magerramov, Vagif Ali, e Mehman Huseyn Hasanov. "DYNAMIC PARAMETERS OF ELASTIC PLATE OPTICAL SWITCH DRIVES". SYNCHROINFO JOURNAL 6, n. 3 (2020): 20–23. http://dx.doi.org/10.36724/2664-066x-2020-6-2-20-23.

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The methods and means of improving the efficiency and the parameters of the dynamic parameters of the elastic plate of the optical commutator drive using advanced information and telecommunication technologies are analyzed. The bandwidth of optical communication networks based on systems with flat spring-loaded optical drive switch rods is investigated. On the basis of the study, the dynamic parameters of the elastic plate of the optical commutator drive are proposed a structural-functional scheme of a system with flat spring-loaded plates and linear algebraic equations for the dynamics of an elastic plate with the aid of which the equation for small oscillations of a rod near a rectilinear position is compiled. The equations of dynamics of systems with flat spring-loaded optical drive switch rods are considered and determined. On the basis of the system-technical analysis, a general integral of the spring deflection equation is determined. With the help of the solution, the equation for the dynamics of an elastic plate obtained a mathematical expression of the displacement of the upper end of the rod vertically of the spring-loaded drive system of the optical commutator.

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Salamatov, E. I. "Elastic-energy propagation in mesoscopic systems". physica status solidi (b) 250, n. 9 (10 luglio 2013): 1932–36. http://dx.doi.org/10.1002/pssb.201349036.

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Syms, R. R. A. "Principles of free-space optical microelectromechanical systems". Proceedings of the Institution of Mechanical Engineers, Part C: Journal of Mechanical Engineering Science 222, n. 1 (1 gennaio 2008): 1–18. http://dx.doi.org/10.1243/09544062jmes662.

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Optical microelectromechanical systems (MEMS) combine miniature optical components with precision fixtures, elastic suspensions, and microactuators, and allow complex functionality at low cost. However, the effect of the bounded nature of the beams propagating through the system on design is profound. The current paper reviews the fundamental consequences. Using a Gaussian beam formulation, models of guided modes in gradient index media, bounded beams and imaging components are constructed. Propagation algorithms are described. The alignment tolerances for common component trains such as fibre-to-fibre and beam-to-fibre connections are derived, limits on the curvature of reflecting surfaces are established, the scaling laws of free-space optical MEMS are presented and the effect of beam size on filter performance is clarified. Examples such as variable optical attenuators, optical cross-connect switches, filters and tunable lasers are discussed.

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Kuma, S. G., e M. M. Woldemariam. "First principle study of structural, elastic, electronic and optical properties of Pb0.5Sn0.5TiO3 and Pb0.5Sn0.5Ti0.5(Zr0.5)O3". Condensed Matter Physics 24, n. 1 (marzo 2021): 13702. http://dx.doi.org/10.5488/cmp.24.13702.

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The structural, electronic, elastic and optical properties of tetragonal (P4mm) phase of Pb0.5Sn0.5TiO3 (PSTO) and Pb0.5Sn0.5Ti0.5(Zr0.5)O3 (PSTZO) are examined by first-principles calculations based on the density functional theory (DFT) using the pseudo-potential plane wave (PP-PW) scheme in the frame of generalized gradient approximation (GGA). We have calculated the ground state properties such as equlibrium lattice constants, volume, bulk modulus and its pressure derivative. From elastic constants, mechanical parameters such as anisotropy factor, elastic modulus and Poisson's ratio are obtained from the Voigt-Reuss-Hill average approximation. Rather than their averages, the directional dependence of elastic modulus, and Poisson's ratio are modelled and visualized in the light of the elastic properties of both systems. In addition, some novel results, such as Debye temperatures, and sound velocities are obtained. Moreover, we have presented the results of the electronic band structure, densities of states and charge densities. These results were in favourable agreement with the existing theoretical data. The optical dielectric function and energy loss spectrum of both systems are also computed. Born effective charge (BEC) of each atoms for both systems is computed from functional perturbation theory (DFPT). Finally, the spontaneous polarization is also determined from modern theory of polarization to be 0.8662 C/m2 (PSTO) and 1.0824 C/m2 (PSTZO).

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Markowski, Marcin. "Heuristic algorithms for joint optimization of unicast and anycast traffic in elastic optical network–based large–scale computing systems". International Journal of Applied Mathematics and Computer Science 27, n. 3 (1 settembre 2017): 605–22. http://dx.doi.org/10.1515/amcs-2017-0043.

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AbstractIn recent years elastic optical networks have been perceived as a prospective choice for future optical networks due to better adjustment and utilization of optical resources than is the case with traditional wavelength division multiplexing networks. In the paper we investigate the elastic architecture as the communication network for distributed data centers. We address the problems of optimization of routing and spectrum assignment for large-scale computing systems based on an elastic optical architecture; particularly, we concentrate on anycast user to data center traffic optimization. We assume that computational resources of data centers are limited. For this offline problems we formulate the integer linear programming model and propose a few heuristics, including a meta-heuristic algorithm based on a tabu search method. We report computational results, presenting the quality of approximate solutions and efficiency of the proposed heuristics, and we also analyze and compare some data center allocation scenarios.

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Wen, T. D., E. Anastassakis e L. P. Xu. "Multilayer Systems Driven by Elastic Standing Waves". Physica Status Solidi (a) 154, n. 2 (16 aprile 1996): 635–45. http://dx.doi.org/10.1002/pssa.2211540217.

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Mousa, Zainab H., e Fatima M. Hussain. "Effect of Coupling Channel on Elastic Scattering for 6He+208Pb, 7Be+58Ni and 7Li+59Co Systems". NeuroQuantology 20, n. 2 (1 aprile 2022): 119–23. http://dx.doi.org/10.14704/nq.2022.20.2.nq22078.

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Effects of coupling channel on elastic scattering have been studied using the nuclear potential Woods-Saxon (WS) for 6He+208Pb, 7Be+58Ni and 7Li+59Co systems. The Continuum-discretized coupled-channels CDCC method have been used to employed no coupled and coupled-channels (CC) calculations for unstable projectiles. Cross-sections of elastic scattering were extracted from the optical potential fits, to achieve the optimum comparability between the theoretical estimates of dσel/dσR and empirical values for the systems reviewed. The breakup process at near Coulomb barrier energies play essential role in the results of cross section as a function of angle and energy in addition to the distribution of the barrier.

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Díaz-de-Anda, A., K. Volke-Sepúlveda, J. Flores, C. Sánchez-Pérez e L. Gutiérrez. "Study of coupled resonators in analogous wave systems: Mechanical, elastic, and optical". American Journal of Physics 83, n. 12 (dicembre 2015): 1012–18. http://dx.doi.org/10.1119/1.4932391.

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Yashchuk, V. M., A. G. Grebinyk, I. V. Lebedyeva, O. V. Vashchilina, M. Yu Losytskyy e O. M. Navozenko. "Sensor Systems with Optical Reponse". Bulletin of Taras Shevchenko National University of Kyiv. Series: Physics and Mathematics, n. 2 (2023): 180–83. http://dx.doi.org/10.17721/1812-5409.2023/2.33.

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This paper is a review of the scientific works of the co-authors. In the paper, the basic principles of action of sensor systems with optical response of two types are considered. In particular, two spectroscopic technologies for probing some objects or events in non-living (synthetic) or biological environments are considered. In the first part of the work, sensor technologies related to the use of probes with optical response specially introduced into the sensor system are analyzed. As a rule, these probes are specially developed systems, the spectral properties of which change significantly under interaction with the object of probing. In the first part of the work, sensors of the first type are considered. In particular, the main ideas used in this type of sensors are given and specific examples of the use of such sensors are analyzed: specially created molecules that have a low fluorescence quantum yield due to a significant number of mechanical intramolecular degrees of freedom. The intercalation of such probes to large biomolecules leads to a change in the spectral characteristics of these probes, in particular, to a significant increase in fluorescence (up to 1000 times). The case of two-photon absorption of molecular probes in the transparency window of biological tissues is examined. Semiconductor and metal nanoparticles whose absorption and fluorescence spectra depend on their sizes were also proposed as probes of the first type (as sensors of elastic vibrations of the environment).The second part of the paper is devoted to the mechanisms of autosensing (the case when the medium's own optical centers are used to detect processes occurring in biological or synthetic systems). The main ideas that underlie the operation of sensors with optical response of this type were analyzed, and examples of such use were also given. In particular, the use of the own spectral properties of biomacromolecules and some coenzymes for changes in the external environment is considered. The use of the optical response of synthetic macromolecules on the value of their molecular weight was also analyzed.

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Abdul-Hamza, Eman D., Fouad A. Majeed e Fatima M. Hussain. "Breakup-Channel Dynamics on the Elastic Scattering Reactions for 8B+58Ni, 9Be+64Zn, and 12C+208Pb Systems". NeuroQuantology 20, n. 3 (26 marzo 2022): 118–25. http://dx.doi.org/10.14704/nq.2022.20.3.nq22051.

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The dynamic effects of breakup Channel on for 8B+58Ni, 9Be+64Zn, and 12C+208Pb systems in elastic scattering reactions have been studied by calculating two quantities, which are the cross-section of the scattering and the distribution of the scattering barrier as functions of the angle of the center of the block and the energy of the center of the mass of some selected systems whose nuclei are Weakly Bound. The calculations are based on continuum discretized coupled-channel (CDCC) theory using code (CC) full quantum mechanics. The interpretation of the experimental findings was evaluated in the context of the optical model using the Woods-Saxon potential. both real and imaginary. In the context of the optical model of the real and imaginary parts, the interpretation of experimental results was analyzed using Woods-Saxon potential. The uncoupling and coupling channels (CC) have been calculated with the energy center Ec.m. to achieve the maximum consistency with experimental data for the systems being studied. The effect of breakup channel is giving a good description of results to be in agreement with experimental data.

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Lanh, N. V., A. M. Belov e N. D. Khanh. "Synthesis of the Kalman Observer for Nonlinear Electric Drive System of the Optical-Mechanical Complex". LETI Transactions on Electrical Engineering & Computer Science 15, n. 10 (2022): 79–86. http://dx.doi.org/10.32603/2071-8985-2022-15-10-79-86.

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The electric drive of the optical-mechanical complex is considered as a three-mass elastic system. The coefficients of elasticity in this case cannot be measured by the sensor and are not fixed by the operating time of the device. The synthesis of observers using the adaptive extended Kalman filter, estimating variables in a three-mass elastic system, is a necessity in electric drive control systems of the optical-mechanical complex. The mathematical model of the three-mass electric drive system of the optical-mechanical complex is built with taking into account nonlinear elastic factors. The Kalman observer is built in combination vector control system with a permanent magnet synchronous motor. This is an important part before the synthesis of the nonlinear predictive controller for electromechanical drive system of the optical-mechanical complex. Simulation results are executed in the MatLab/Simulink environment.

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Kovriguine, D. A., G. A. Maugin e A. I. Potapov. "Multiwave nonlinear couplings in elastic structures". Mathematical Problems in Engineering 2006 (2006): 1–11. http://dx.doi.org/10.1155/mpe/2006/76041.

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This short contribution considers the essentials of nonlinear wave properties in typical mechanical systems such as an infinite straight bar, a circular ring, and a flat plate. It is found that nonlinear resonance is experienced in all the systems exhibiting continuous and discrete spectra, respectively. Multiwave interactions and the stability of coupled modes with respect to small perturbations are discussed. The emphasis is placed on mechanical phenomena, for example, stress amplification, although some analogies with some nonlinear optical systems are also obvious. The nonlinear resonance coupling in a plate within the Kirchhoff-Love approximation is selected as a two-dimensional example exhibiting a rich range of resonant wave phenomena. This is originally examined by use of Whitham's averaged Lagrangian method. In particular, the existence of three basic resonant triads between longitudinal, shear, and bending modes is shown. Some of these necessarily enter cascade wave processes related to the instability of some mode components of the triad under small perturbations.

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Giri, A. K., e G. B. Mitra. "Theoretical prediction of elastic constants of mixed systems". physica status solidi (b) 134, n. 1 (1 marzo 1986): K11—K16. http://dx.doi.org/10.1002/pssb.2221340152.

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Satoru Ohta. "Optimizing meta-slots for nonblocking elastic optical switching networks". Global Journal of Engineering and Technology Advances 7, n. 3 (30 giugno 2021): 046–61. http://dx.doi.org/10.30574/gjeta.2021.7.3.0078.

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Elastic optical network is a promising technology for building flexible and wideband communication systems. This technology features the frequency slot unit (FSU) concept, which defines the bandwidth unit in the frequency domain. The utilization of a specified number of consecutive FSUs allows the bandwidth to be flexibly assigned to a data stream. For a successful elastic optical network operation, the use of nonblocking optical switching networks is indispensable. This paper focuses on two previously proposed W-S-W switching network architectures, namely, WSW1 and WSW2. With regard to WSW1, a previous study elucidated that the hardware complexity, which is evaluated by the number of FSUs, decreases by employing the meta-slot scheme. A meta-slot is a frequency range containing one or more FSUs. Although its effectiveness depends on the sizes of meta-slot classes, the previous study did not present how to optimize the meta-slot class sizes. Moreover, the employment of meta-slots was not considered for WSW2 in the previous study. This paper investigates the optimization of meta-slot class sizes and demonstrates that such optimization is modeled as the shortest path problem. For WSW1, the meta-slot scheme optimized by the shortest path model is compared with the previously reported nonblocking conditions. The result confirms the superiority of the optimized meta-slot scheme. For WSW2, the assignment of meta-slots among S-switches is also essential. The paper models the assignment of meta-slots as a bin-packing problem. Thus, the near-optimal assignment can be obtained by a known bin-packing heuristic. For WSW2, the number of S-switches is evaluated for the optimized meta-slot scheme and the previously known nonblocking conditions. The result confirms that the meta-slot scheme is advantageous for WSW2 as well as for WSW1.

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KHAN, SOHAIL A. "IWBC ANALYSIS WITH QUASIMOLECULAR OPTICAL POTENTIALS". International Journal of Modern Physics E 14, n. 02 (marzo 2005): 269–78. http://dx.doi.org/10.1142/s0218301305003028.

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The quasimolecular optical potential with Incoming Wave Boundary Condition model is used to obtain the fusion and elastic scattering cross-section at the sub-Coulomb region and above. This has been done for the 16 O +16 O and 12 C +12 C systems. It is found that sudden potentials describe well the average trend in the fusion and elastic scattering cross-section using the Incoming Wave Boundary Condition Method. Potentials fits for low energy are then used to obtain cross-sections at higher energies. Excellent agreement is obtained for the location of various peaks observed experimentally, especially in the case of 16 O +16 O . The parameters from these potentials give information on the nuclei in these dynamical situations. We find that a larger radius and a low density in the central region is required to explain the phenomena. The range of Yukawa potentials used are also larger by a factor of two as compared to those used by other authors.

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Tomaszewski, Artur. "Design of Optical Wireless Networks with Fair Traffic Flows". Journal of Applied Mathematics 2014 (2014): 1–5. http://dx.doi.org/10.1155/2014/938483.

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The paper presents a method for optimising the wireless optical network that carries elastic packet traffic. The particular focus is on modelling the effect of elastic traffic flows slowing down in response to the decrease of the optical transmission systems’ capacity at bad weather conditions. A mathematical programming model of the network design problem is presented that assumes that the packet rates of elastic traffic flows decrease fairly. While practically any subset of network links can be simultaneously affected by unfavourable transmission conditions, a particular challenge of solving the problem results from a huge number of network states considered in the model. Therefore, how the problem can be solved by generating the most unfavourable network states is presented. Moreover, it is proved that it is entirely sufficient to consider only the states that correspond to the decrease of capacity on a single link. Finally, as the general problem is nonlinear, it is shown that the problem can be transformed to a linear MIP problem and solved effectively when single-path routing of traffic flows is assumed.

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Sert, Y., e I. Boztosun. "Radial sensitivity of the optical model potentials for 4He+120Sn and 6He+120Sn". International Journal of Modern Physics E 25, n. 09 (settembre 2016): 1650071. http://dx.doi.org/10.1142/s0218301316500713.

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In this paper, the radial sensitivity of the elastic scattering cross-section for the 4He and 6He on [Formula: see text]Sn have been examined at energies near the Coulomb barrier. We also investigate the variation of the potential radius depending on the incident energy for the [Formula: see text]Sn and [Formula: see text]Sn systems. Especially, we have taken care of to stay within one family for [Formula: see text]Sn elastic scattering, i.e., using [Formula: see text] real depth have not been changed by more than 20–30%.

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Ding, Shifeng, Gangxiang Shen, Kevin X. Pan, Sanjay K. Bose, Qiong Zhang e Biswanath Mukherjee. "Blockchain-Assisted Spectrum Trading Between Elastic Virtual Optical Networks". IEEE Network 34, n. 6 (novembre 2020): 205–11. http://dx.doi.org/10.1109/mnet.011.2000138.

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Martynchuk, I. G., e S. A. Zhmylev. "Time parameters linear approximation method in elastic systems". Scientific and Technical Journal of Information Technologies, Mechanics and Optics 23, n. 3 (1 giugno 2023): 547–52. http://dx.doi.org/10.17586/2226-1494-2023-23-3-547-552.

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Schehr, G., T. Giamarchi e P. Le Doussal. "Specific heat of quantum elastic systems pinned by disorder". European Physical Journal B 44, n. 4 (aprile 2005): 521–34. http://dx.doi.org/10.1140/epjb/e2005-00152-1.

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Pryce, Imogen M., Koray Aydin, Yousif A. Kelaita, Ryan M. Briggs e Harry A. Atwater. "Characterization of the tunable response of highly strained compliant optical metamaterials". Philosophical Transactions of the Royal Society A: Mathematical, Physical and Engineering Sciences 369, n. 1950 (13 settembre 2011): 3447–55. http://dx.doi.org/10.1098/rsta.2011.0122.

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Metamaterial designs are typically limited to a narrow operating bandwidth that is predetermined by the fabricated dimensions. Various approaches have previously been used to introduce post-fabrication tunability and thus enable active metamaterials. In this work, we exploit the mechanical deformability of a highly compliant polymeric substrate to achieve dynamic, tunable resonant frequency shifts greater than a resonant linewidth. We investigate the effect of metamaterial shape on the plastic deformation limit of resonators. We find that, for designs in which the local strain is evenly distributed, the response is elastic under larger global tensile strains. The plastic and elastic limits of resonator deformation are explored and the results indicate that, once deformed, the resonators operate within a new envelope of elastic response. We also demonstrate the use of coupled resonator systems to add an additional degree of freedom to the frequency tunability and show that compliant substrates can be used as a tool to test coupling strength. Finally, we illustrate how compliant metamaterials could be used as infrared sensors, and show enhancement of an infrared vibration absorption feature by a factor of 225.

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Berkovitch, Alexander, e Lev V. Eppelbaum. "Can the Applied Optics Employ Modern Approaches Developed in Seismic Prospecting? A Review". Physics 4, n. 3 (24 luglio 2022): 833–46. http://dx.doi.org/10.3390/physics4030053.

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The concept of infinitesimal elastic deformation and the theory of elastic seismic waves was formed in the first part of the 19th century and was based mainly on the Fermat, Huygens and Snell developments in the theory of optics. At the same time, seismic wave propagation (utilized in geophysical prospecting) and optic wave propagation through defined media are based on the same physical-mathematical principles, making it possible to transfer nonconventional procedures developed in the first domain to the second one and back. In this investigation, we propose transferring advanced methodologies established in seismic prospecting to practical optics. We selected two advanced approaches with the following aims: (a) homeomorphic imaging; (b) novel description of boundary conditions. The first approach is established with the utilization of the revealed local theoretical relationship between the geometrical features of two fundamental beams and the geometrical properties of hidden geological targets of the media under study. The employed geometrical characteristics of the fundamental beams are spreading functions and curvatures of the singular wavefronts. The second approach is based on a novel description of the boundary conditions. It enables the determination of a faultless seismic (optical) system with the preassigned focusing and imaging assets when any aberrations are absent. An optimal optical system is usually determined as some arrangement agreeing to some perfect system with acceptable correctness. Employment of the developed procedures in the optical design will permit the application of a description of the optical surface using: (1) parametric functions, (2) differential equations, and (3) mixed (parametric-differential). On this basis, optical systems with a minimal number of optical features with complicated shapes can be promptly computed. Another important application field of the suggested methods is the design of optical systems with diffractive elements.

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Olszewski, Ireneusz. "Modified Dual-Path Allocation Algorithm in Elastic Optical Networks". Journal of Network and Systems Management 28, n. 4 (5 febbraio 2020): 1036–54. http://dx.doi.org/10.1007/s10922-020-09513-4.

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Abstract Dual-path allocation problem is considered to be a case of multipath routing in Elastic Optical Networks. In this article, the optimization problem is formulated and a dual-path allocation algorithm that solves this problem proposed. In the considered problem all traffic for each request is broken into two equal parts, which are directed along two link-disjoint paths. After any link failure, half of the traffic for each affected request is realized. The proposed algorithm is based on the two weight matrices: the elements of the first one depend on the actual length of the links and their utilization, while the elements of the second one assume unit values if the links exist in the network. The proposed algorithm rejects smaller requests and provides a much lower bandwidth blocking probability than other analyzed algorithms.

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Aguirre, Diego Fernando, Julio Barón Velandia e Octavio Salcedo Parra. "Routing in Elastic Optical Networks Based on Deep Reinforcement Learning for Multi-Agent Systems". International Review on Modelling and Simulations (IREMOS) 15, n. 5 (31 ottobre 2022): 332. http://dx.doi.org/10.15866/iremos.v15i5.22768.

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KIM, YONG JOO, e MOON HOE CHA. "OPTICAL POTENTIALS BY INVERSION FOR 16O ION ELASTIC SCATTERINGS AT Elab=1503 MeV". International Journal of Modern Physics E 09, n. 04 (agosto 2000): 299–307. http://dx.doi.org/10.1142/s0218301300000210.

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The optical potentials by inversion are presented in two ways. The first one is to use the inverse eikonal relations derived from McIntyre phase shifts. The second one is to solve the inversion problem based on McIntyre parametrization of S-matrix corresponding to the Woods-Saxon type optical potentials. The optical potentials obtained from the two inversion methods are applied to the systems 16 O +12 C , 16 O +28 Si , and 16 O +40 Ca at E lab =1503 MeV . The calculated results are compared with those from the optical model analysis. It is shown that both the two methods lead to reasonable agreements, in the surface region, to the results from the optical model analysis.

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Alyatama, Anwar. "Adaptive spectrum allocation algorithm for elastic optical networks with multicasting". Journal of High Speed Networks 24, n. 2 (27 marzo 2018): 133–46. http://dx.doi.org/10.3233/jhs-180586.

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Bilal, Osama R., André Foehr e Chiara Daraio. "Bistable metamaterial for switching and cascading elastic vibrations". Proceedings of the National Academy of Sciences 114, n. 18 (17 aprile 2017): 4603–6. http://dx.doi.org/10.1073/pnas.1618314114.

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The realization of acoustic devices analogous to electronic systems, like diodes, transistors, and logic elements, suggests the potential use of elastic vibrations (i.e., phonons) in information processing, for example, in advanced computational systems, smart actuators, and programmable materials. Previous experimental realizations of acoustic diodes and mechanical switches have used nonlinearities to break transmission symmetry. However, existing solutions require operation at different frequencies or involve signal conversion in the electronic or optical domains. Here, we show an experimental realization of a phononic transistor-like device using geometric nonlinearities to switch and amplify elastic vibrations, via magnetic coupling, operating at a single frequency. By cascading this device in a tunable mechanical circuit board, we realize the complete set of mechanical logic elements and interconnect selected ones to execute simple calculations.

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Abenga, RC, JO Fiase e GJ Ibeh. "Optical Model Analysis of α + 40Ca at Elab=104 and 141.7 MeV". NIGERIAN ANNALS OF PURE AND APPLIED SCIENCES 3, n. 2 (23 luglio 2020): 252–60. http://dx.doi.org/10.46912/napas.144.

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Optical model analysis of the elastic scattering analysis of α + 40Ca at Elab=104 and 141.7 MeV have been performed using the folding model approach of the nuclear reaction video (NRV) knowledge base code. The M3Y-type effective nucleon-nucleon interaction derived using the lowest order constrained variational (LOCV) approach for mass number A=40 was used to obtain the results. Elastic scattering differential cross section data were obtained for this system at two bombarding energies. The calculated differential cross sections are in good agreement with the experimental results and the anticipated mass dependence of the M3Y-type effective interaction improved the results at forward angles. This shows that, the mass dependence of the M3Y-type effective interaction in our results should be of value in the description of the scattering of other nuclear systems

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Małkiewicz, Konrad, Michał Krasowski, Jakub Bartczak, Marta Radziejewska e Kinga Bociong. "Analysis of shrinkage stresses arising during polymerization of orthodontic adhesive systems". Polimery 68, n. 5 (21 agosto 2023): 269–75. http://dx.doi.org/10.14314/polimery.2023.5.4.

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The aim of the study was to evaluate the shrinkage stress during cross-linking of compositeorthodontic adhesive systems. The elastic-optical method was used for shrinkage stress analysis. Basedon the obtained results, basic statistics were determined, including averages and standard deviations.For the comparative analysis of the mean values, the Tukey HSD test was used at the significance levelα = 0.05. The average value of shrinkage stress during cross-linking ranged from 7.2 to 11.5 MPa.

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Bustingorry, S., A. B. Kolton, A. Rosso, W. Krauth e T. Giamarchi. "Thermal effects in the dynamics of disordered elastic systems". Physica B: Condensed Matter 404, n. 3-4 (marzo 2009): 444–46. http://dx.doi.org/10.1016/j.physb.2008.11.064.

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Wang, Yang, Chaoyang Li, Qian Hu, Jabree Flor e Maryam Jalalitabar. "Routing and Spectrum Allocation in Spectrum-Sliced Elastic Optical Path Networks: A Primal-Dual Framework". Electronics 10, n. 22 (16 novembre 2021): 2809. http://dx.doi.org/10.3390/electronics10222809.

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The recent decade has witnessed a tremendous growth of Internet traffic, which is expected to continue climbing for the foreseeable future. As a new paradigm, Spectrum-sliced Elastic Optical Path (SLICE) networks promise abundant (elastic) bandwidth to address the traffic explosion, while bearing other inherent advantages including enhanced signal quality and extended reachability. The fundamental problem in SLICE networks is to route each traffic demand along a lightpath with continuously and consecutively available sub-carriers, which is known as the Routing and Spectrum Allocation (RSA) problem. Given its NP-Hardness, the solutions to the RSA problem can be classified into two categories: optimal solutions using link-based, path-based, and channel-based Integer Linear Programming (ILP) models, which require extensive computational time; and sub-optimal heuristic and meta-heuristic algorithms, which have no guarantee on the solution quality. In this work, inspired by a channel-based ILP model, we propose a novel primal-dual framework to address the RSA problem, which can obtain a near-optimal solution with guaranteed per-instance closeness to the optimal solution.

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Егоров, Ф. А. "Лазерное, фотоэмиссионное возбуждение упругих колебаний в микрооптоэлектромеханических системах". Письма в журнал технической физики 46, n. 13 (2020): 39. http://dx.doi.org/10.21883/pjtf.2020.13.49590.18076.

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The possibility and efficiency of laser excitation of elastic vibrations in microoptoelectromechanical systems due to photo-emission recoil force are analyzed. It is shown that in such systems, based on GaAs, this mechanism of excitation of oscillations can turn out to be an order of magnitude more efficient than light pressure. The method of creating such systems proposed in this paper opens up possibilities for the development of new types of high-speed optical functional elements controlled by light.

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NAZRIN, S. N. "IMPACT OF ERBIUM-DOPED ZINC TELLURITE GLASSES ON RAMAN SPECTROSCOPY, ELASTIC AND OPTICAL PROPERTIES". Chalcogenide Letters 18, n. 1 (gennaio 2021): 11–22. http://dx.doi.org/10.15251/cl.2021.181.11.

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In this study, the melt-quenching technique was employed to fabricate a series of zinc tellurite glass systems doped with erbium oxide. At room temperature, raman spectroscopy, elastic and optical measurements were utilized to analyse and report the result of prepared glass samples. The raman spectra displays the existence of structural units of tellurite networks such as trigonal bipyramid and trigonal pyramid. The elastic parameters including Debye temperature, mean velocity, acoustic impedance and softening temperature provide a fluctuating trend against the concentration of erbium oxide. The increment and decrement of these parameters can be explained by the ‘competition’ of non-bridging and bridging oxygen atoms. In the aspect of optical approach, the oxide ion polarizability, optical basicity and metallization criterion display more than one trend. Again, this can be correlated to the presence of erbium oxide which affects the vicinity in the glass matrix.

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Głąbowski, Mariusz, e Maciej Sobieraj. "Advanced Considerations Concerning Impact of Applied Call Admission Control Mechanisms on Traffic Characteristics in Elastic Optical Network Nodes". Journal of Telecommunications and Information Technology 4 (17 novembre 2023): 68–75. http://dx.doi.org/10.26636/jtit.2023.4.1380.

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Over the past few years, a significant increase in network traffic volumes has been observed. The ever growing bandwidth demands mean that a reliable and optimum service level needs to be ensured in communication systems for specific traffic categories. Optimal allocation and use of resources may be achieved through the use of call admission control (CAC) mechanisms implemented in network systems. The resource reservation mechanism and the threshold mechanism are two of the most popular CAC methods. In the reservation mechanisms, a certain number of resources is reserved for selected (predefined) services only. In the case of threshold mechanisms, the number of resources allocated to individual traffic classes depends on the network load. This article discusses the results of simulations verifying the impact of applied CAC mechanisms on the traffic characteristics in elastic optical network (EON) nodes with a Clos structure. Loss probability results obtained with the use of the simulator are presented as well.

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Khorasani, Yaghoub, Akbar Ghaffarpour Rahbar e Behrooz Alizadeh. "A novel adjustable defragmentation algorithm in elastic optical networks". Optical Fiber Technology 82 (gennaio 2024): 103615. http://dx.doi.org/10.1016/j.yofte.2023.103615.

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Hoschke, Nigel, Don C. Price, D. Andrew Scott e W. Lance Richards. "Structural Health Monitoring of Space Vehicle Thermal Protection Systems". Key Engineering Materials 558 (giugno 2013): 268–80. http://dx.doi.org/10.4028/www.scientific.net/kem.558.268.

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The thermal protection systems of spacecraft are vulnerable to damage from impacts by foreign objects moving at high velocities. This paper describes a proposed novel structural health monitoring system that will detect, locate and evaluate the damage resulting from such impacts. This system consists of a network of intelligent local agents, each of which controls a network of piezoelectric acoustic emission sensors to detect and locate an impact, and a network of optical fibre Bragg grating sensors to evaluate the effect of the impact damage by means of a thermographic technique. The paper concentrates on two issues that are critical to the successful implementation of the proposed SHM system: measurement of the elastic properties of the thermal protection material, knowledge of which is essential to the design and operation of the acoustic emission sensor network; and investigation of the practical feasibility of a switched network of optical fibre sensors.

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Sobieraj, Maciej, Piotr Zwierzykowski e Erich Leitgeb. "Modelling and Optimization of Multi-Service Optical Switching Networks with Threshold Management Mechanisms". Electronics 10, n. 13 (23 giugno 2021): 1515. http://dx.doi.org/10.3390/electronics10131515.

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DWDM networks make use of optical switching networks that allow light waves of multiple lengths to be serviced and provide the possibility of converting them appropriately. Research work on optical switching networks focuses on two main areas of interest: new non-blocking structures for optical switching networks and finding traffic characteristics of switching networks of the structures that are already well known. In practical design of switching nodes in optical networks, in many cases, the Clos switching networks are successfully used. Clos switching networks are also used in Elastic Optical Networks that can effectively manage allocation of resources to individual multi-service traffic streams. The research outcomes presented in this article deal with the problems of finding traffic characteristics in blocking optical switching networks with known structures. This article aims at presenting an analysis of the influence of traffic management threshold mechanisms on the traffic characteristics of multi-service blocking Clos switching networks that are used in the nodes of elastic optical networks as well as their influence on the traffic efficiency of network nodes. The analysis was carried out on the basis of research studies performed in a specially dedicated purpose-made simulation environment. The article presents a description of the simulation environment used in the experiments. The study was focused on the influence of the threshold mechanism, which is one of the most commonly used and elastic traffic management mechanisms, and on the traffic characteristics of switching networks that service different mixtures of multi-service Erlang, Engset and Pascal traffic streams. The conducted study validates the operational effectiveness and practicality of the application of the threshold mechanism to model traffic characteristics of nodes in an elastic optical network.

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Djabella, H., e R. D. Arnell. "Finite element analysis of elastic stresses in multilayered systems". Thin Solid Films 245, n. 1-2 (giugno 1994): 27–33. http://dx.doi.org/10.1016/0040-6090(94)90872-9.

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41

Carbone, Diana, Roberto Linares, Paulina Amador-Valenzuela, Salvatore Calabrese, Francesco Cappuzzello, Manuela Cavallaro, Suna Firat et al. "Initial State Interaction for the 20Ne + 130Te and 18O + 116Sn Systems at 15.3 AMeV from Elastic and Inelastic Scattering Measurements". Universe 7, n. 3 (5 marzo 2021): 58. http://dx.doi.org/10.3390/universe7030058.

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Double charge exchange (DCE) reactions could provide experimentally driven information about nuclear matrix elements of interest in the context of neutrinoless double-β decay. To achieve this goal, a detailed description of the reaction mechanism is mandatory. This requires the full characterization of the initial and final-state interactions, which are poorly known for many of the projectile-target systems involved in future DCE studies. Among these, we intend to study the 20Ne + 130Te and 18O + 116Sn systems at 15.3 AMeV, which are particularly relevant due to their connection with the 130Te→130Xe and 116Cd→116Sn double-β decays. We measure the elastic and inelastic scattering cross-section angular distributions and compare them with theoretical calculations performed in the optical model, one-step distorted wave Born approximation, and coupled-channel approaches using the São Paulo double-folding optical potential. A good description of the experimental data in the whole explored range of transferred momenta is obtained provided that couplings with the 21+ states of the projectile and target are explicitly included within the coupled-channel approach. These results are relevant also in the analysis of other quasi-elastic reaction channels in these systems, in which the same couplings should be included.

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Benner, G., W. Probst e R. Rilk. "Electron optical design of an EFTEM concerning optimum selection of imaging parameters for different sizes of detection systems". Proceedings, annual meeting, Electron Microscopy Society of America 53 (13 agosto 1995): 308–9. http://dx.doi.org/10.1017/s0424820100137914.

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The amount of information which can be gained about an object is considerably improved by the incorporation of an imaging energy filter in a TEM. Besides the conventional modes of operation elastic brightfield (EBF) and darkfield (EDF) imaging or diffraction are provided by an Energy Filtering Transmission Electron Microscope (EFTEM) as well as Electron Spectroscopic Imaging (ESI) or Electron Energy Loss Spectroscopy (EELS). Thus, the demands for carefully designed highly flexible electron optics are much more sophisticated as compared to a CTEM.One of the most important parameters for elastic imaging and ESI is the width of the energy window, which can be selected by a slit aperture of adjustable width according to the particular needs. This energy window defines the size of the transferable specimen area or diffraction pattern, respectively, as well as the acceptance angle of the spectrometer. In order to meet the optimum parameters concerning the energy window and the size of the detection system (e.g. photographic plate, image plate, Slow Scan CCD camera (SSCCD), TV camera, electron detector, etc.) the magnifications of the pre- and of the post-spectrometer projector lens systems has to be independently adjustable.

43

Parang, Z., T. Ghaffary e M. M. Gharahbeigi. "Effect of elastic constants of liquid crystals in their electro-optical properties". International Journal of Geometric Methods in Modern Physics 14, n. 11 (23 ottobre 2017): 1750163. http://dx.doi.org/10.1142/s0219887817501638.

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Recently following the success of the density functional theory (DFT) in obtaining the structure and thermodynamics of homogeneous and inhomogeneous classical systems such as simple fluids, dipolar fluid and binary hard spheres, this theory was also applied to obtain the density profile of a molecular fluid in between hard planar walls by Kalpaxis and Rickayzen. In the theory of molecular fluids, the direct correlation function (DCF) can be used to calculate the equation of state, free energy, phase transition, elastic constants, etc. It is well known that the hard core molecular models play an important role in understanding complex liquids such as liquid crystals. In this paper, a classical fluid of nonspherical molecules is studied. The required homogeneous (DCF) is obtained by solving Orenstein–Zernike (OZ) integral equation numerically. Some of the molecules in the liquid crystals have a sphere shape and this kind of molecular fluid is considered here. The DCF sphere of the molecular fluid is calculated and it will be shown that the results are in good agreement with the pervious works and the results of computer simulation. Finally the electro-optical properties of ellipsoid liquid crystal using DCF of these molecules are calculated.

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Behfar, Mohammad H., Donato Di Vito, Arttu Korhonen, Dung Nguyen, Belal Mostafa Amin, Timo Kurkela, Markus Tuomikoski e Matti Mantysalo. "Fully Integrated Wireless Elastic Wearable Systems for Health Monitoring Applications". IEEE Transactions on Components, Packaging and Manufacturing Technology 11, n. 6 (giugno 2021): 1022–27. http://dx.doi.org/10.1109/tcpmt.2021.3082647.

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Bormashenko, Edward, Irina Legchenkova e Mark Frenkel. "Negative Effective Mass in Plasmonic Systems II: Elucidating the Optical and Acoustical Branches of Vibrations and the Possibility of Anti-Resonance Propagation". Materials 13, n. 16 (9 agosto 2020): 3512. http://dx.doi.org/10.3390/ma13163512.

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We report the negative effective mass metamaterials based on the electro-mechanical coupling exploiting plasma oscillations of free electron gas. The negative mass appears as a result of the vibration of a metallic particle with a frequency ω which is close to the frequency of the plasma oscillations of the electron gas m2, relative to the ionic lattice m1. The plasma oscillations are represented with the elastic spring constant k2=ωp2m2, where ωp is the plasma frequency. Thus, the metallic particle vibrating with the external frequency ω is described by the effective mass meff=m1+m2ωp2ωp2−ω2, which is negative when the frequency ω approaches ωp from above. The idea is exemplified with two conducting metals, namely Au and Li embedded in various matrices. We treated a one-dimensional lattice built from the metallic micro-elements meff connected by ideal springs with the elastic constant k1 representing various media such as polydimethylsiloxane and soda-lime glass. The optical and acoustical branches of longitudinal modes propagating through the lattice are elucidated for various ratios ω1ωp, where ω12=k1m1 and k1 represents the elastic properties of the medium. The 1D lattice, built from the thin metallic wires giving rise to low frequency plasmons, is treated. The possibility of the anti-resonant propagation, strengthening the effect of the negative mass occurring under ω = ωp = ω1, is addressed.

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Hai, Dao Thanh, Wosen Eshetu Kassa e Fen Zhou. "On three shades of partial protection in elastic optical networks". Optical Fiber Technology 80 (ottobre 2023): 103394. http://dx.doi.org/10.1016/j.yofte.2023.103394.

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ANOH, Nogbou Georges, Ali Ouattara KOBENAN, Joel Christian ADEPO, Michel BABRI e Ahmed Dooguy KORA. "Energy Consumption-sensitive Intentional Rerouting of Protected Connections in Elastic Optical Networks". International Journal of Computer Network and Information Security 16, n. 1 (8 febbraio 2024): 73–84. http://dx.doi.org/10.5815/ijcnis.2024.01.06.

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The reduction of energy consumption in elastic optical networks is of major interest to the research community. As a result, several methods for solving this problem in combination with existing classical problems have been proposed. Elastic optical networks are subject to disturbance phenomena that degrade their quality and performance. To optimize resources, operators must recalculate new routes and plan the displacement of established connections towards these new routes to cope with these phenomena, it’s the reconfiguration. The problem addressed in this article is to reconfigure a set of unicast protected connections without interruption to a new routing calculated during the process. Knowing that the use of backup paths solves the interruption problem, but has an impact on the overall energy consumption, the goal is to find a good compromise between the two sub-problems when switching from old routes to new ones. To the best of our knowledge, there is no work on reconfiguration that uses energy-aware backup paths. In this work, we proposed an energy-aware EERA_EON rerouting algorithm using the backup paths. Simulations have shown the performance of this approach in terms of energy consumption compared to the work of our predecessors. Subsequently, we proposed a classical BRA_EON rerouting algorithm in elastic optical networks. Simulation results show that we perform BRA_EON in terms of the number of steps.

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Shehadeh, Zuhair F., e Reham M. El-Shawaf. "Analyses of \pi^{\pm} nucleus elastic scattering data at T_\pi = 40, 30, 20 MeV using a suggested scaling method". Revista Mexicana de Física 64, n. 3 (30 aprile 2018): 314. http://dx.doi.org/10.31349/revmexfis.64.314.

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The data for elastically scattered charged pions from few nuclei, namely ^{12}C, ^{16}O, ^{28}Si, ^{32}S, ^{40}Ca, ^{56}Fe, ^{58}Ni, and ^{90}Zr have been analyzed by obtained potentials using a suggested scaling procedure. Originally the \pi ^{\pm}-^{12}C elastic scattering data at 50 MeV was nicely fitted by a parameterized simple local optical potential extracted from available phase shifts using inverse scattering theory. The potential parameters of the \pi ^{\pm}-^{12}C systems were scaled to \pi ^{\pm}-^{16}O systems and then successively to other few systems covering the scattering of charged pions from target nuclei, namely \pi ^{\pm}-^{28}Si, \pi ^{\pm}-^{32}S, \pi ^{\pm}-^{40}Ca, \pi ^{\pm}-^{56}Fe, \pi ^{\pm}-^{58}Ni and \pi ^{\pm}-^{90}Zr . The obtained scaled potentials showed a remarkable success in explaining the available measured elastic differential cross sections, and in predicting other ones for the systems under consideration. The reaction cross sections have been calculated for all these systems at the three incident pion's kinetic energies, T\pi = 40, 30, 20 MeV. Unfortunately, experimental reaction cross sections are totally absent or cloudy and unconfident. As such, and at this stage, we consider our calculated values useful and pending for future investigations. For the systems and energies considered herein, simple scaling relations are well established. This will be beneficial in analyzing similar nuclear scattering data, as low-energy pion-nucleus and kaon-nucleus elastic scattering data; and, hopefully, in explaining pionic atom data.

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Chakravartti-Giri, L., e A. K. Giri. "Theoretical Prediction of Elastic Constants and Their Pressure Derivatives of Mixed Systems". physica status solidi (b) 177, n. 2 (1 giugno 1993): K67—K70. http://dx.doi.org/10.1002/pssb.2221770236.

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Ayaz, M., e L. Beygi. "Optimizing elastic optical networks quality of transmission with an empirical optical amplifier gain saturation model". Optical Fiber Technology 84 (maggio 2024): 103729. http://dx.doi.org/10.1016/j.yofte.2024.103729.

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