Articles de revues : « Optical-mechanical analogy »

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Valishin, N. T., A. I. Volkov, Z. F. Bildanova et V. A. Selivanova. « To continue the optical-mechanical analogy ». Journal of Physics : Conference Series 1679 (novembre 2020) : 022016. http://dx.doi.org/10.1088/1742-6596/1679/2/022016.

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Aliev, Ismail N., Igor V. Fomin et Zarifa A. Samedova. « OPTICAL-MECHANICAL ANALOGY OF THE GRAVITATIONAL FIELD ». Bulletin of the Moscow State Regional University (Physics and Mathematics), n^o 4 (2017) : 55–61. http://dx.doi.org/10.18384/2310-7251-2017-4-55-61.

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Abdil’din, M. M., M. E. Abishev, N. A. Beissen et A. S. Taukenova. « On the optical-mechanical analogy in general relativity ». Gravitation and Cosmology 17, n^o 2 (avril 2011) : 143–46. http://dx.doi.org/10.1134/s0202289311020034.

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Aslanyan, A. L., L. S. Aslanyan et S. K. Nazaryan. « Optical-mechanical analogy in problems of polarization optics ». Journal of Contemporary Physics (Armenian Academy of Sciences) 47, n^o 1 (25 janvier 2012) : 23–28. http://dx.doi.org/10.3103/s1068337212010057.

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Nandi, Kamal K., et Anwarul Islam. « On the optical–mechanical analogy in general relativity ». American Journal of Physics 63, n^o 3 (mars 1995) : 251–56. http://dx.doi.org/10.1119/1.17934.

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Khan, Sameen Ahmed. « Hamilton's optical–mechanical analogy in the wavelength-dependent regime ». Optik 130 (février 2017) : 714–22. http://dx.doi.org/10.1016/j.ijleo.2016.10.112.

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Delphenich, D. H. « The optical-mechanical analogy for wave mechanics : a new hope ». Journal of Physics : Conference Series 2197, n^o 1 (1 mars 2022) : 012005. http://dx.doi.org/10.1088/1742-6596/2197/1/012005.

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Abstract The continuum-mechanical formulation of wave mechanics suggests that there is an intermediate stage of theoretical generality between wave mechanics and point mechanics, namely, continuum mechanics. When that argument is applied to the corresponding transition from wave optics to geometrical optics, the corresponding intermediate stage is essentially the geometrical theory of diffraction, i.e., the theory of diffracted geodesics.

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Alsing, Paul M. « The optical-mechanical analogy for stationary metrics in general relativity ». American Journal of Physics 66, n^o 9 (septembre 1998) : 779–90. http://dx.doi.org/10.1119/1.18957.

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Becchetti, F. D. « The nuclear optical model and its optical-scattering analog : Mie scattering ». American Journal of Physics 91, n^o 8 (1 août 2023) : 637–43. http://dx.doi.org/10.1119/5.0152813.

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The methods devised by Gustav Mie in 1908 to explain the scattering of electromagnetic waves have a close analogy with quantum-mechanical models developed many years later to describe nuclear scattering. In particular, these models use either a complex index of refraction or a complex nuclear scattering potential to account for attenuation caused by non-elastic scattering. We briefly outline the historical development of these models and give examples illustrating the close analogy between them, their parameters, and the resulting scattering. In both models, the ratio of the incident wavelength to the object size, λ/D, can be determined from the scattering characteristics, allowing the extraction of microscopic particle dimensions. This close analogy allows students to simulate accelerator-based nuclear scattering experiments with table-top optical-scattering experiments.

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Opatrny, T. « Mean value and uncertainty of optical phase-a simple mechanical analogy ». Journal of Physics A : Mathematical and General 27, n^o 21 (7 novembre 1994) : 7201–8. http://dx.doi.org/10.1088/0305-4470/27/21/034.

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SMITH, RUSSELL. « Optical reflection and mechanical rebound : the shift from analogy to axiomatization in the seventeenth century. Part 1 ». British Journal for the History of Science 41, n^o 1 (27 septembre 2007) : 1–18. http://dx.doi.org/10.1017/s0007087407000362.

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AbstractThis paper aims to show that the seventeenth-century conception of mechanics as the science of particles in motion founded on universal laws of motion owes much to the employment of a new conceptual resource – the physics of motion developed within optics. The optical analysis of reflection was dynamically interpreted through the mechanical analogy of rebound. The kinematical and dynamical principles so employed became directly applicable to natural phenomena after the eventual transformation of light's ontological status from that of an Aristotelian ‘quality’ to a corpuscular phenomenon, engendered by the rise of atomism during the first half of the seventeenth century. The mechanization of light led to a conceptual shift from the analogical employment of dynamical principles in the physical interpretation of reflection to the mechanical generalization of optical principles – the direct application of kinematical and dynamical principles of reflection to mechanical collisions. This first part of the paper traces out the first conceptual shift from Aristotle's original analogy of reflection as rebound to its full concretization. A second part will trace out the second conceptual shift, from the full concretization of this analogy to the axiomatization of already generalized kinematical and dynamical principles of reflection into laws of nature and of motion.

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BAUM, E. « ANALYSIS OF OPTICAL WAVEGUIDES USING AN ANALOGY TO A MECHANICAL VIBRATION PROBLEM ». COMPEL - The international journal for computation and mathematics in electrical and electronic engineering 8, n^o 3 (mars 1989) : 123–26. http://dx.doi.org/10.1108/eb010054.

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Bogatskaya, A. V., N. V. Klenov, M. V. Tereshonok et A. M. Popov. « Optical-Mechanical Analogy Approach for the Purposes of Detection of IR-MW Radiation ». EPJ Web of Conferences 195 (2018) : 05002. http://dx.doi.org/10.1051/epjconf/201819505002.

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Joas, Christian, et Christoph Lehner. « The classical roots of wave mechanics : Schrödinger's transformations of the optical-mechanical analogy ». Studies in History and Philosophy of Science Part B : Studies in History and Philosophy of Modern Physics 40, n^o 4 (décembre 2009) : 338–51. http://dx.doi.org/10.1016/j.shpsb.2009.06.007.

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Padinhattayil, Sanoop, et K. Sheshappa Rai. « Analogy and Comparative Study of Hydroxypropyl Methylcellulose (HPMC) Biopolymer with Graphene Oxide and Zinc Oxide Nano Fillers ». Asian Journal of Chemistry 33, n^o 7 (2021) : 1513–18. http://dx.doi.org/10.14233/ajchem.2021.23193.

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Present study describes the analogy and comparative study of polymer nanocomposites with the known polymer matrix hydroxypropyl methylcellulose (HPMC) incorporated with graphene oxide (GO) and zinc oxide (ZnO) nanoparticles as nano fillers. The polymer nanocomposite films were carried out using solution casting method and characterized by IR spectroscopy, XRD analysis, mechanical properties, thermal characterization and optical microscopy analysis. There were several changes in the HPMC polymer by the addition of nanoparticles of GO and ZnO in structural, thermal, mechanical and optical properties. The thermal stability of the composite films increased as compared with the pure HPMC whereas the mechanical study shows a variation of down values.

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Jost, Bradley M. « One-dimensional photonic bandgap structures and the analogy between optical and quantum mechanical tunnelling ». European Journal of Physics 18, n^o 2 (1 mars 1997) : 108–12. http://dx.doi.org/10.1088/0143-0807/18/2/010.

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Edwards, Matthew R. « Gravity from refraction of CMB photons using the optical-mechanical analogy in general relativity ». Astrophysics and Space Science 351, n^o 2 (juin 2014) : 401–6. http://dx.doi.org/10.1007/s10509-014-1864-4.

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Rozenman, Georgi Gary, Shenhe Fu, Ady Arie et Lev Shemer. « Quantum Mechanical and Optical Analogies in Surface Gravity Water Waves ». Fluids 4, n^o 2 (27 mai 2019) : 96. http://dx.doi.org/10.3390/fluids4020096.

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We present the theoretical models and review the most recent results of a class of experiments in the field of surface gravity waves. These experiments serve as demonstration of an analogy to a broad variety of phenomena in optics and quantum mechanics. In particular, experiments involving Airy water-wave packets were carried out. The Airy wave packets have attracted tremendous attention in optics and quantum mechanics owing to their unique properties, spanning from an ability to propagate along parabolic trajectories without spreading, and to accumulating a phase that scales with the cubic power of time. Non-dispersive Cosine-Gauss wave packets and self-similar Hermite-Gauss wave packets, also well known in the field of optics and quantum mechanics, were recently studied using surface gravity waves as well. These wave packets demonstrated self-healing properties in water wave pulses as well, preserving their width despite being dispersive. Finally, this new approach also allows to observe diffractive focusing from a temporal slit with finite width.

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Goulart, E. « Mimicking General Relativity with Newtonian Dynamics ». ISRN Mathematical Physics 2012 (10 novembre 2012) : 1–15. http://dx.doi.org/10.5402/2012/260951.

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The aim of this paper is twofolded. (1) Showing that Newtonian mechanics of point particles in static potentials admits an alternative description in terms of effective riemannian spacetimes. (2) Using the above geometrization scheme to investigate aspects of the gravitational field as it appears in the Einstein theory. It is shown that the mechanical (3 + 1) effective metrics are quite similar to Gordon's metric, as it is suggested by the well-known optical-mechanical analogy. Some special potentials are worked out.

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Schegolev, Andrey E., Nikolay V. Klenov, Anna V. Bogatskaya, Rustam D. Yusupov et Alexander M. Popov. « A Pair of Coupled Waveguides as a Classical Analogue for a Solid-State Qubit ». Sensors 22, n^o 21 (28 octobre 2022) : 8286. http://dx.doi.org/10.3390/s22218286.

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We have determined conditions when a pair of coupled waveguides, a common element for integrated room-temperature photonics, can act as a qubit based on a system with a double-well potential. Moreover, we have used slow-varying amplitude approximation (SVA) for the “classical” wave equation to study the propagation of electromagnetic beams in a couple of dielectric waveguides both analytically and numerically. As a part of an extension of the optical-mechanical analogy, we have considered examples of “quantum operations” on the electromagnetic wave state in a pair of waveguides. Furthermore, we have provided examples of “quantum-mechanical” calculations of nonlinear transfer functions for the implementation of the considered element in optical neural networks.

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Rechcińska, Katarzyna, Mateusz Król, Rafał Mazur, Przemysław Morawiak, Rafał Mirek, Karolina Łempicka, Witold Bardyszewski et al. « Engineering spin-orbit synthetic Hamiltonians in liquid-crystal optical cavities ». Science 366, n^o 6466 (7 novembre 2019) : 727–30. http://dx.doi.org/10.1126/science.aay4182.

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Spin-orbit interactions lead to distinctive functionalities in photonic systems. They exploit the analogy between the quantum mechanical description of a complex electronic spin-orbit system and synthetic Hamiltonians derived for the propagation of electromagnetic waves in dedicated spatial structures. We realize an artificial Rashba-Dresselhaus spin-orbit interaction in a liquid crystal–filled optical cavity. Three-dimensional tomography in energy-momentum space enabled us to directly evidence the spin-split photon mode in the presence of an artificial spin-orbit coupling. The effect is observed when two orthogonal linear polarized modes of opposite parity are brought near resonance. Engineering of spin-orbit synthetic Hamiltonians in optical cavities opens the door to photonic emulators of quantum Hamiltonians with internal degrees of freedom.

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Pinto, Fabrizio. « Nanomechanical sensing of gravitational wave-induced Casimir force perturbations ». International Journal of Modern Physics D 23, n^o 12 (octobre 2014) : 1442001. http://dx.doi.org/10.1142/s0218271814420012.

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It is shown by means of the optical medium analogy that the static Casimir force between two conducting plates is modulated by gravitational waves. The magnitude of the resulting force changes within the range of already existing small force metrology. It is suggested to enhance the effects on a Casimir force oscillator by mechanical parametric amplification driven by periodic illumination of interacting semiconducting boundaries. This represents a novel opportunity for the ground-based laboratory detection of gravitational waves on the nanoscale.

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SMITH, RUSSELL. « Optical reflection and mechanical rebound : the shift from analogy to axiomatization in the seventeenth century. Part 2 ». British Journal for the History of Science 41, n^o 2 (25 septembre 2007) : 187–207. http://dx.doi.org/10.1017/s0007087407000374.

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Evans, James, Kamal K. Nandi et Anwarul Islam. « The optical–mechanical analogy in general relativity : New methods for the paths of light and of the planets ». American Journal of Physics 64, n^o 11 (novembre 1996) : 1404–15. http://dx.doi.org/10.1119/1.18366.

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Evans, James, Kamal K. Nandi et Anwarul Islam. « The optical-mechanical analogy in general relativity : Exact Newtonian forms for the equations of motion of particles and photons ». General Relativity and Gravitation 28, n^o 4 (avril 1996) : 413–39. http://dx.doi.org/10.1007/bf02105085.

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Akram, Shazad, Kent Bertilsson et Johan Siden. « LTspice Electro-Thermal Model of Joule Heating in High Density Polyethylene Optical Fiber Microducts ». Electronics 8, n^o 12 (1 décembre 2019) : 1453. http://dx.doi.org/10.3390/electronics8121453.

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At present, optical fiber microducts are joined together by mechanical type joints. Mechanical joints are bulky, require more space in multiple duct installations, and have poor water sealing capability. Optical fiber microducts are made of high-density polyethylene which is considered best for welding by remelting. Mechanical joints can be replaced with welded joints if the outer surface layer of the optical fiber microduct is remelted within one second and without thermal damage to the inner surface of the optical fiber duct. To fulfill these requirements, an electro-thermal model of Joule heat generation using a copper coil and heat propagation inside different layers of optical fiber microducts was developed and validated. The electro-thermal model is based on electro-thermal analogy that uses the electrical equivalent to thermal parameters. Depending upon the geometric shape and material properties of the high-density polyethylene, low-density polyethylene, and copper coil, the thermal resistance and thermal capacitance values were calculated and connected to the Cauer RC-ladder configuration. The power input to Joule heating coil and thermal convection resistance to surrounding air were also calculated and modelled. The calculated thermal model was then simulated in LTspice, and real measurements with 50 µm K-type thermocouples were conducted to check the validity of the model. Due to the non-linear transient thermal behavior of polyethylene and variations in the convection resistance values, the calculated thermal model was then optimized for best curve fitting. Optimizations were conducted for convection resistance and the power input model only. The calculated thermal parameters of the polyethylene layers were kept intact to preserve the thermal model to physical structure relationship. Simulation of the optimized electro-thermal model and actual measurements showed to be in good agreement.

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Lima, Nathan, et Ricardo Karam. « Schrödinger’s equation from Snell’s law ». European Journal of Physics 43, n^o 3 (21 mars 2022) : 035402. http://dx.doi.org/10.1088/1361-6404/ac5635.

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Abstract A new derivation of Schrödinger’s equation is presented, based on Schrödinger’s original discussions on refraction and the optical-mechanical analogy, but adopting a much simpler formalism: Newtonian mechanics and some basic elements of classical wave theory (such as Snell’s law). We compare how particles and waves refract and show that the ‘law of particle refraction’ and the ‘law of wave refraction’ may become consistent if one assumes that a particle can be represented by a wave group. In this case, the differential equation whose solutions represent the waves forming such wave group is the Schrödinger equation. Due to the simplicity of the adopted mathematical formalism, we argue that this derivation can be used in quantum mechanics courses at introductory level to give students an idea of Schrödinger’s original path to his wave equation.

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Juarez-Morales, J. C., et M. Lourdes Granados-Marin. « Description of Dipole Moment Coupling Depending on Time Using Catastrophe Theory in Metallic Nanoparticles ». Advanced Materials Research 718-720 (juillet 2013) : 47–51. http://dx.doi.org/10.4028/www.scientific.net/amr.718-720.47.

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We describe the non-harmonic dipole moment resulting of the interaction between a set of nanoparticles randomly distributed with a linear polarized plane wave. The study is performed by considering its structural parameters as function of time establishing a mechanical analogy with a spring less system. The simplest case occurs for two nanoparticles and the Mathieu differential equation describes the dipole interaction, from which interesting resonance effects are predicted. We show that an effective refractive index depending of time is obtained having the possibility to take negative values which offers interesting applications in the development of metamaterials. Finally associating a catastrophe function for the phase function, during the emission process we are able to describe the width of the frequency spectrum. The theoretical are well agree with experimental results previously reported in the optical literature.

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Le, Thi Xiu, Michel Bornert, Ross Brown, Patrick Aimedieu, Daniel Broseta, Baptiste Chabot, Andrew King et Anh Minh Tang. « Combining Optical Microscopy and X-ray Computed Tomography Reveals Novel Morphologies and Growth Processes of Methane Hydrate in Sand Pores ». Energies 14, n^o 18 (9 septembre 2021) : 5672. http://dx.doi.org/10.3390/en14185672.

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Understanding the mechanisms involved in the formation and growth of methane hydrate in marine sandy sediments is crucial for investigating the thermo-hydro-mechanical behavior of gas hydrate marine sediments. In this study, high-resolution optical microscopy and synchrotron X-ray computed tomography were used together to observe methane hydrate growing under excess gas conditions in a coarse sandy sediment. The high spatial and complementary temporal resolutions of these techniques allow growth processes and accompanying redistribution of water or brine to be observed over spatial scales down to the micrometre—i.e., well below pore size—and temporal scales below 1 s. Gas hydrate morphological and growth features that cannot be identified by X-ray computed tomography alone, such as hollow filaments, were revealed. These filaments sprouted from hydrate crusts at water–gas interfaces as water was being transported from their interior to their tips in the gas (methane), which extend in the µm/s range. Haines jumps are visualized when the growing hydrate crust hits a water pool, such as capillary bridges between grains or liquid droplets sitting on the substrate—a capillary-driven mechanism that has some analogy with cryogenic suction in water-bearing freezing soils. These features cannot be accounted for by the hydrate pore habit models proposed about two decades ago, which, in the absence of any observation at pore scale, were indeed useful for constructing mechanical and petrophysical models of gas hydrate-bearing sediments.

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Шумилович, Богдан, Bogdan Shumilovich, Андрей Сущенко, Andrew Sushchenko, Алексей Морозов et Aleksey Morozov. « SYSTEM OF DIRECT COMPOSITE VENEERS COMPONEER. WORK DIFFICULTIES AND WAYS OF OVERCOMING THEM ». Actual problems in dentistry 11, n^o 3 (25 juin 2015) : 14–24. http://dx.doi.org/10.18481/2077-7566-2015-11-3-4-14-24.

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<p>A system of finished Componeer composite veneers is a unique and having no analogy in the world elaboration of the Swiss company <em>Coltene/Whaledent</em>, an outcome of almost half a century experience of the company working in a field of composite materials. It combines the best features of direct and indirect restoration methods. The system is fulfilled of nano-composite Synergy D6 that has high mechanical strength, convenience for workable consistency, color stability and a system of halftone shades, which facilitates color matching. All this allows achieving excellent aesthetic results in minimal time. Application of an original standard scale gives possibility effectively assess optical properties of dental hard tissues and develop an implementation strategy of restoration before work started. Formation of Componeer form, polymerization and polishing at factory allow a practitioner fully utilize effect of "fluorescence" inherent to the material. All this allows us to position the Componeer system as a serious alternative to non-direct methods of restoration with the possibility of both high aesthetic and cosmetic reconstruction reliability.</p>

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Lai, H. M., Lai‐Yung Leung, Kwok‐Leung Lee et K. P. Chik. « Mechanical analog of optical retarders ». American Journal of Physics 54, n^o 5 (mai 1986) : 455–58. http://dx.doi.org/10.1119/1.14614.

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Mazauric, Vincent, Ariane Millot, Claude Le Pape-Gardeux et Nadia Maïzi. « Optimal approaches to manage power system decarbonation ». International Journal of Applied Electromagnetics and Mechanics 64, n^o 1-4 (10 décembre 2020) : 1447–52. http://dx.doi.org/10.3233/jae-209464.

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To overcome the negative environemental impact of the actual power system, an optimal description of quasi-static electromagnetics relying on a reversible interpretation of the Faraday’s law is given. Due to the overabundance of carbon-free energy sources, this description makes it possible to consider an evolution towards an energy system favoring low-carbon technologies. The management for changing is then explored through a simplified linear-programming problem and an analogy with phase transitions in physics is drawn.

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Vardeny, Z. « Soliton defects in trans-(CH)x and dangling bond defects in a-Si:H ; A surprising analogy ». Synthetic Metals 28, n^o 3 (février 1989) : D247—D252. http://dx.doi.org/10.1016/0379-6779(89)90699-1.

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Symotiuk, Nazar. « Historical aspect of the development of op-art late XX – beginning of XXI century ». Bulletin of Lviv National Academy of Arts, n^o 39 (2019) : 288–300. http://dx.doi.org/10.37131/2524-0943-2019-39-20.

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Background. Analyzing the recent publications one can observe that scientists are quite interested in optical art. The issues of op-art in the Ukrainian art have been investigated by V.Kosiv, N.Diadiukh-Bohatko and L.Andrushko, I.Kuznetsova and O.Arbuzova, S.Bodnarenko and V.Nekrasa. The research of foreign scientists, where the authors argue that studies in fine arts can bring important conclusions about the visual system, is of importance in the development of this topic.Therefore, analyzing the processes of the development of traditional and modern artistic forms, it can be stated that op-art both in the Ukrainian cultural environment and in general, continues to exist, but in somewhat modified form. Goals. The purpose of this article is to review key ideas, author's models and preconditions for the development of op-art in XX - beginning of XXI centuries. The objective of the proposed publication is the widest representation of op-art in various spheres and directions of the modern artistic process, as well as to reveal the potential opportunities for the creation of a new visual art. Methods. In the course of this work, generalization and idealization were taken for the main methods. Basic methods such as abstraction, analogy, modeling and hypothetical approach were also used in this study. Results. The article reviews the origins and formation of optical art. The psychophysical influence of optical illusions on the recipient has been considered. The key concepts of op-art development and their influence on the development of contemporary art in general have been outlined. The emergence and significance of anonymous groups in Western Europe that explore a wide range of kinetic art and optical effects using various types of artificial light and mechanical motion has been explored. The influence of technological progress on the formation of optical techniques in art has been determined, as well as their specificity and transformation into various areas of the artistic process. The role of synthesis of op-art and kinetic art in creating a wide range of visual effects has been traced. Possibilities of application of optical illusions in various aspects of cultural and artistic process have been revealed. The history of the creation of anonymous groups and their influence on the stylistic peculiarities of the art has been studied. The article demonstrates the significance of volumetric - spatial structures in the modern globalized world and their convergence with the forms of massive spectacles and attractions using optical techniques. At the same time, the importance of further research of the little-known phenomenon of optical art in Ukraine has been emphasized. Conclusions. Summing up the influence and historical aspects of the development of op-art, one can confidently state that there is no clear answer and criteria for designating a direction to specific frames, since there are many different factors, each of which makes some modifications to optical illusions. This is not just about the visual component, but also about an ideology that collectively expands the field for experiments. Thus, one can state that the present theoretical research about the emergence of op-art and its significance in the modern globalized world’s art demonstrates the existence of various conceptual approaches and reveals new vectors of representing the art of the third millennium. Therefore, it should be noted that artistic modifications that occur under the influence of modern technologies require more attention and deeper investigation of the poorly-studied phenomenon of the optical art in Ukraine.

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Hijmans, T. W., H. B. Brom et L. J. de Jongh. « The incommensurate phase in spin-Peierls systems and its analogy with the regular Peierls problem : A resonance study ». Synthetic Metals 19, n^o 1-3 (mars 1987) : 373–78. http://dx.doi.org/10.1016/0379-6779(87)90382-1.

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KOLOTVINA, OLGA V. « IMMERSIVE TECHNOLOGIES OF J. VAL DEL OMAR’S MEDIA ART (“APANORAMIC IMAGE OVERFLOW”, “DIAPHONY”, “TACTILE VISION”) AS AN EXPRESSION OF HIS CONCEPT OF “MECHANICAL MYSTICISM” ». ART AND SCIENCE OF TELEVISION 17, n^o 1 (2021) : 51–71. http://dx.doi.org/10.30628/1994-9529-2021-17.1-51-71.

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The article analyzes three media technologies for creating an immersive polysensory environment, developed back in 1940–1960s by the Spanish film director and engineer Jose Val del Omar. The technologies are considered in the context of the director’s key concept, which he called “mechanical mysticism”. It was aimed at creating a cinematic analogy of mystical experience by transforming the mysticism of Spanish culture into cinematic technologies. The author reveals how the conversion of the suggestive artistic potential of Spanish mysticism into the immersiveness of film technologies allowed J. Val del Omar to create art spaces that took the system of illusions beyond the visual into special modes of psychological experiences. On the example of his films (Water- Mirror of Granada, 1955, and Fire in Castile, 1961), the author analyzes the originality of the engineering solutions of J. Val del Omar’s technologies, defines the strategies of immersiveness and their rootedness in Spanish mysticism, qualifies the aesthetic impact of these media technologies on viewers. The article demonstrates that immersiveness is achieved by using a shock strategy of interlacing the effects of suggestiveness and defamiliarization (“ostranenie”), as well as through the expansion of the range of the viewer’s sensory perception and the effect of synesthesia. The suggestive impression effect is enhanced by visual poetic metaphors that reveal to the viewers the historically formed sensual imagery of Spanish mysticism. With the help of optical and light technologies, the semantic field of a film is not only visualized, but also illusively materialized as a three-dimensional image. НАУКА ТЕЛЕВИДЕНИЯ № 17.1, 2021 54 THE ART AND SCIENCE OF TELEVISION In general, the strategies reproduce the sensual immersiveness, which is inherent in the Spanish Catholic cultural experience. Such strategies block the viewers’ psychological distancing mechanisms and cause affective states and emotional involvement in the art spaces. Such technological innovations for creation of immersive spectacular audio-visual environments brought the J. Val del Omar’s cinema into the field of multi-media, and therefore he could rightfully be considered the forerunner of media art, the creator of art spaces, which later became known as sound and video installations.

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Craven, J. M., E. Meeks, G. Delich, E. Ayars, H. K. Pechkis et J. A. Pechkis. « A low-cost shutter driver and arbitrary waveform generator for optical switching using a programmable system-on-chip (PSoC) device ». Review of Scientific Instruments 93, n^o 11 (1 novembre 2022) : 113002. http://dx.doi.org/10.1063/5.0105884.

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We have developed a low-cost mechanical shutter driver with integrated arbitrary waveform generation for optical switching and control using a programmable system-on-chip device. This microcontroller-based device with configurable digital and analog blocks is readily programmed using free software, allowing for easy customization for a variety of applications. Additional digital and analog outputs with arbitrary timings can be used to control a variety of devices, such as additional shutters, acousto-optical modulators, or camera trigger pulses, for complete control and imaging of laser light. Utilizing logic-level control signals, this device can be readily integrated into existing computer control and data acquisition systems for expanded hardware capabilities.

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Kondrin, Mikhail V., Yulia B. Lebed et Vadim V. Brazhkin. « Structure and topology of three-dimensional hydrocarbon polymers ». Acta Crystallographica Section B Structural Science, Crystal Engineering and Materials 72, n^o 4 (1 août 2016) : 634–41. http://dx.doi.org/10.1107/s2052520616007253.

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A new family of three-dimensional hydrocarbon polymers which are more energetically favorable than benzene is proposed. Although structurally these polymers are closely related to well known diamond and lonsdaleite carbon structures, using topological arguments we demonstrate that they have no known structural analogs. Topological considerations also give some indication of possible methods of synthesis. Taking into account their exceptional optical, structural and mechanical properties these polymers might have interesting applications.

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Grechishnikov, V. M., et E. G. Komarov. « Increasing the information capacity of a fiber-optic multi-sensor converter of binary mechanical signals into electrical signals ». Izmeritel`naya Tekhnika, n^o 9 (2020) : 15–23. http://dx.doi.org/10.32446/0368-1025it.2020-9-15-23.

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The design and operation principle of a multi-sensor Converter of binary mechanical signals into electrical signals based on a partitioned fiber-optic digital-to-analog Converter with a parallel structure is considered. The digital-to-analog Converter is made from a set of simple and technological (three to five digit) fiber-optic digital-to-analog sections. The advantages of the optical scheme of the proposed. Converter in terms of metrological and energy characteristics in comparison with single multi-bit converters are justified. It is shown that by increasing the number of digital-analog sections, it is possible to repeatedly increase the information capacity of a multi-sensor Converter without tightening the requirements for its manufacturing technology and element base. A mathematical model of the proposed Converter is developed that reflects the features of its operation in the mode of sequential time conversion of the input code vectors of individual fiber-optic sections into electrical analogues and the formation of the resulting output code vector.

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Sachdeva, Geeta, Sumandeep Kaur, Ravindra Pandey et Shashi P. Karna. « First-Principles Study of Linear and Nonlinear Optical Properties of Multi-Layered Borophene ». Computation 9, n^o 9 (18 septembre 2021) : 101. http://dx.doi.org/10.3390/computation9090101.

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Anisotropic materials are of great interest due to their unique direction-dependent optical properties. Borophene, the two-dimensional analog of graphene consisting of boron atoms, has attracted immense research interest due to its exciting anisotropic electronic and mechanical properties. Its synthesis in several structural polymorphic configurations has recently been reported. The present work reports the layer-dependent optical absorption and hyperpolarizabilities of the buckled borophene (δ6-borophene). The results, based on density functional theory, show that multilayer borophene is nearly transparent with only a weak absorbance in the visible region, reflecting its anisotropic structural characteristics. The static first-order hyperpolarizability significantly increases with the number of layers, due mainly to interactions among the frontier orbitals in multilayer borophene. Transparency in the visible region combined with enhanced nonlinear optical properties makes the multilayer borophene important for future photonics technologies.

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Parafiniak, Maciej. « Experimental testing of mechanical properties of 3D FDM printed material using optical, non-contact displacement measurement technology ». Mechanik, n^o 12 (décembre 2016) : 1852–55. http://dx.doi.org/10.17814/mechanik.2016.12.578.

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Wojewnik, Piotr, et Jakub Żmigrodzki. « An infrared-based device for non-invasive monitoring of eyelid movement during sleep ». Polish Journal of Medical Physics And Engineering 19, n^o 2 (7 mars 2014) : 85–91. http://dx.doi.org/10.2478/pjmpe-2013-0004.

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Abstract The increased movement of eyes and eyelids is characteristic of the rapid eye movement (REM) sleep stage, making it an important indicator in sleep monitoring. A device was designed to detect this activity in a non-invasive way by means of measuring infrared light intensity reflected off the eyelid. The system converts the light intensity into current through a photodetector, performs analog signal processing and analog to digital conversion (ADC). The data is transmitted wirelessly to a computer, where the results can be displayed, stored and analyzed with a dedicated software, which also provides control over the device. The hardware is embedded in a mask, which is put over the patient's eyes. User safety in terms of mechanical, electrical and optical dangers has been ensured. The device was tested on a napping subject.

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Trajin, Baptiste, et Paul-Etienne Vidal. « Bond graph multi-physics modeling of encapsulating materials in power electronic modules ». European Physical Journal Applied Physics 89, n^o 2 (février 2020) : 20902. http://dx.doi.org/10.1051/epjap/2020180287.

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This paper focuses on multi-physics modeling of encapsulating gels in power electronic modules for transient and steady-state simulation. With the emergence of wide-bandgap semiconductors such as SiC or GaN, operating at a higher temperature than conventional Si power chips, this passive element of the packaging appears as a few studied element sensitive to thermal and mechanical stresses. A thermo-mechanical coupled modeling of the material, based on bond graph representation, is presented. This approach allows to establish, under the same formalism, an analogy between the different physical domains. From this analogy, a multi-physical nonlinear state space representation is built, allowing transient simulation of the thermo-mechanical behavior of the material. This way of modeling and simulating is particularly adapted for a preliminary study during the upstream phases of design of the power electronic modules. It quickly establishes the maximum temperature and mechanical strains experienced by the gel.

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Shoydin, Sergey A., et Artem L. Pazoev. « CORRECTION OF PROJECTIVE DEFORMATIONS OF 3D OBJECT, ON THE STAGE OF HOLOGRAM FORMATION ». Interexpo GEO-Siberia 8, n^o 1 (8 juillet 2020) : 97–107. http://dx.doi.org/10.33764/2618-981x-2020-8-1-97-107.

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The problems of digital synthesis of holograms associated with a discrete representation of a signal forming a holographic image are analyzed. One of the significant limitations is the technological problems of the formation of holographic structures pointwise due to diffraction limitations of the size of the focused spot of the optical-mechanical builder. This narrows the spectrum of possible spatial frequencies of the pointwise synthesized hologram in comparison with the classical hologram recorded in an analog way, which in turn leads to difficulties in recording holograms with a large depth of 3D image. We discuss a way to overcome this problem by using an optical projection system with the possibility of both transverse and longitudinal image size. Some possibilities of constructing such systems are shown and experimentally confirmed, and some problems of deformation distortions of 3D images arising during their creation are analyzed.

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Fuhrer, Michael S., Chun Ning Lau et Allan H. MacDonald. « Graphene : Materially Better Carbon ». MRS Bulletin 35, n^o 4 (avril 2010) : 289–95. http://dx.doi.org/10.1557/mrs2010.551.

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AbstractGraphene, a single atom–thick plane of carbon atoms arranged in a honeycomb lattice, has captivated the attention of physicists, materials scientists, and engineers alike over the five years following its experimental isolation. Graphene is a fundamentally new type of electronic material whose electrons are strictly confined to a two-dimensional plane and exhibit properties akin to those of ultrarelativistic particles. Graphene's two-dimensional form suggests compatibility with conventional wafer processing technology. Extraordinary physical properties, including exceedingly high charge carrier mobility, current-carrying capacity, mechanical strength, and thermal conductivity, make it an enticing candidate for new electronic technologies both within and beyond complementary metal oxide semiconductors (CMOS). Immediate graphene applications include high-speed analog electronics and highly conductive, flexible, transparent thin films for displays and optoelectronics. Currently, much graphene research is focused on generating and tuning a bandgap and on novel device structures that exploit graphene's extraordinary electrical, optical, and mechanical properties.

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Sakuldeemeekiat, Thamolchanok, Natchaya Luamsri, Jatuphorn Wootthikanokkhan et Manisara Phiriyawirut. « The effects of thermochromic pigments on optical, mechanical, and heat insulation properties of plasticized PVC window film ». Journal of Thermoplastic Composite Materials 33, n^o 9 (20 janvier 2019) : 1196–216. http://dx.doi.org/10.1177/0892705718820392.

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In this study, a feasibility for developing window films for energy efficiency in building based on poly(vinyl chloride) (PVC) composite was explored, using two different types of thermochromic pigments, such as vanadium dioxide (VO2) and thermoreversal-40. Using VO2, tensile properties of the PVC film improved, accompanied with an increase of percentage gelation of PVC. On the other hand, thermochromic behaviors, in the visible light region of the PVC/thermoreversal-40 film, were more obvious than those of the PVC/VO2 analog. The percentage of transmittance of the near infrared wave through the PVC/VO2 film was much lower than that transmitted through the PVC/thermoreversal-40 film. The above improvement was achieved at the expense of the thermal stability of the PVC film.

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Grinchuk, P. S., H. Abuhimd, A. V. Akulich, M. V. Kiyashko, D. V. Solovei, M. O. Stepkin, V. V. Toropov, M. D. Shashkov, A. A. Khort et M. Yu Liakh. « High thermal conductivity silicon-carbide ceramics for large-size space optics ». Doklady of the National Academy of Sciences of Belarus 63, n^o 2 (18 mai 2019) : 223–34. http://dx.doi.org/10.29235/1561-8323-2019-63-2-223-234.

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The paper describes the important aspects of the developed technology for manufacturing silicon-carbide substrates for optical mirrors intended for future use in space applications. It is shown that the material with the best combination of thermophysical and mechanical properties (Maksutov’s criterion) among the known analogs used for making astronomical mirrors is obtained. The characteristics of a mirror made of a lightweight mirror substrate with a diameter of 205 mm are described, compared with the parameters of most known mirrors made of silicon carbide for various space missions and as proto types. It is shown that the produced substrate is characterized by a rather low specific gravity – 16.5 kg/m2, which is comparable with the indicators of the best world analogues.

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Gurauskis, Donatas, Artūras Kilikevičius et Sergejus Borodinas. « Experimental Investigation of Linear Encoder’s Subdivisional Errors under Different Scanning Speeds ». Applied Sciences 10, n^o 5 (4 mars 2020) : 1766. http://dx.doi.org/10.3390/app10051766.

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Optical encoders are widely used in applications requiring precise displacement measurement and fluent motion control. To reach high positioning accuracy and repeatability, and to create a more stable speed-control loop, essential attention must be directed to the subdivisional error (SDE) of the used encoder. This error influences the interpolation process and restricts the ability to achieve a high resolution. The SDE could be caused by various factors, such as the particular design of the reading head and the optical scanning principle, quality of the measuring scale, any kind of relative orientation changes between the optical components caused by mechanical vibrations or deformations, or scanning speed. If the distorted analog signals are not corrected before interpolation, it is very important to know the limitations of the used encoder. The methodology described in this paper could be used to determine the magnitude of an SDE and its trend. This method is based on a constant-speed test and does not require high-accuracy reference. The performed experimental investigation of the standard optical linear encoder SDE under different scanning speeds revealed the linear relationship between the tested encoder’s traversing velocity and the error value. A more detailed investigation of the obtained results was done on the basis of fast Fourier transformation (FFT) to understand the physical nature of the SDE, and to consider how to improve the performance of the encoder.

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Dalvit, Diego A. R., et Wilton J. M. Kort-Kamp. « Shaping Dynamical Casimir Photons ». Universe 7, n^o 6 (6 juin 2021) : 189. http://dx.doi.org/10.3390/universe7060189.

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Temporal modulation of the quantum vacuum through fast motion of a neutral body or fast changes of its optical properties is known to promote virtual into real photons, the so-called dynamical Casimir effect. Empowering modulation protocols with spatial control could enable the shaping of spectral, spatial, spin, and entanglement properties of the emitted photon pairs. Space–time quantum metasurfaces have been proposed as a platform to realize this physics via modulation of their optical properties. Here, we report the mechanical analog of this phenomenon by considering systems in which the lattice structure undergoes modulation in space and in time. We develop a microscopic theory that applies both to moving mirrors with a modulated surface profile and atomic array meta-mirrors with perturbed lattice configuration. Spatiotemporal modulation enables motion-induced generation of co- and cross-polarized photon pairs that feature frequency-linear momentum entanglement as well as vortex photon pairs featuring frequency-angular momentum entanglement. The proposed space–time dynamical Casimir effect can be interpreted as induced dynamical asymmetry in the quantum vacuum.

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Gordeyev, Stanislav, Adam E. Smith, Jacob A. Cress et Eric J. Jumper. « Experimental studies of aero-optical properties of subsonic turbulent boundary layers ». Journal of Fluid Mechanics 740 (5 janvier 2014) : 214–53. http://dx.doi.org/10.1017/jfm.2013.658.

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AbstractThis paper gives the most-complete characterization to date of the optical aberrations imposed on a laser beam propagated through a subsonic, compressible, turbulent boundary layer in a zero-pressure gradient environment, over a range of boundary-layer thicknesses, oblique propagation angles and Mach numbers. This characterization is based on optical measurements using optical-wavefront-sensing instruments that have only become available in the last decade. The optical characterization includes and discusses in detail: optical-wavefront spectra, convective velocities of optically active large-scale structures and correlation functions in both streamwise and cross-stream directions, as well as root-mean-square optical path difference levels for different apertures. The scaling law based on the extended strong Reynolds analogy is derived and is shown to successfully collapse optical data collected in a number of facilities. Anisotropy of aero-optical distortions for different oblique viewing angles was experimentally quantified and is discussed.

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