The Experts below are selected from a list of 318 Experts worldwide ranked by ideXlab platform
Demetrios N Christodoulides - One of the best experts on this subject based on the ideXlab platform.
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discrete solitons and soliton induced dislocations in partially coherent photonic lattices
Physical Review Letters, 2004Co-Authors: Hector Martin, Eugenia D Eugenieva, Zhigang Chen, Demetrios N ChristodoulidesAbstract:We investigate both experimentally and theoretically the Interaction between a light beam and a photonic lattice optically induced with partially coherent light. We demonstrate a clear transition from two-dimensional discrete diffraction to discrete solitons in such a partially coherent lattice and show that the nonlinear Interaction Process is associated with a host of new phenomena including lattice dislocation, lattice deformation, and creation of structures akin to optical polarons.
Jiazuo Zhou - One of the best experts on this subject based on the ideXlab platform.
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study on theory model of hydro thermal mechanical Interaction Process in saturated freezing silty soil
International Journal of Heat and Mass Transfer, 2014Co-Authors: Mingyi Zhang, Jiazuo ZhouAbstract:Abstract The freezing of frost susceptible soils is a dynamic hydro-thermal–mechanical (THM) interacting Process. One-side freezing experiments of saturated soil in an open system with no-pressure water supplement are carried out. In these experiments, we analyzed the influence of temperature gradients, overburden pressures and cooling temperatures on moisture migration and frost heave. Based on these experiments, a mathematical model of frost heave is proposed with the variables of temperature, porosity and displacement, in which Clapeyron equation is employed as the phase equilibrium condition of water and ice in soil. Ice lens is one of the major aspects of the frost heave for frost susceptible soils. According to the mechanical and physical characteristics, a comprehensive criterion for the formation and end of new ice lens is presented. To solve the nonlinear equations, the finite element algorithm is applied to solve the general form of governing equations. Finally, numerical simulations are implemented with the assistance of COMSOL. Validation of the model is illustrated by comparisons between the simulation and experimental results. From this study, it is found that, (1) cooling temperature is the necessary condition for moisture migration and frost heave since pore water phases into ice under cooling temperature. Then negative pore water pressure occurs in soil. Pore water pressure gradient is the direct driving force for water migration in saturated soil. However, temperature gradient and overburden pressure have important influence on the pore water pressure gradient. The response of soil sample to the variation of water content lags behind the response to the change of temperature. (2) Discontinuously distributed ice lenses form near the cold front when the accumulated water phases to ice. Temperature gradient, overburden pressure and cooling temperature are key factors to determine the frost heave and moisture migration. (3) Freezing and migration of unfrozen water cause the change of porosity in soil. Ice lens will block the migration of unfrozen water. The discrete ice lenses result in the oscillation in the distributions of water content. (4) Unsaturated phenomenon occurs in the unfrozen zone under the frozen fringe which might be related to the suction effect of large negative pressure in this zone.
W. Verheyden - One of the best experts on this subject based on the ideXlab platform.
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Stakeholders' perspectives on the operationalisation of the ecosystem service concept: results from 27 case studies
Ecosystem Services, 2018Co-Authors: J. Dick, F. Turkelboom, Harry Woods, I. Iniesta Arandia, E. Primmer, S.r. Saarela, P. Bezák, P. Mederly, M. Leone, W. VerheydenAbstract:The ecosystem service (ES) concept is becoming mainstream in policy and planning, but operational influence on practice is seldom reported. Here, we report the practitioners' perspectives on the practical implementation of the ES concept in 27 case studies. A standardised anonymous survey (n = 246), was used, focusing on the science-practice Interaction Process, perceived impact and expected use of the case study assessments. Operationalisation of the concept was shown to achieve a gradual change in practices: 13% of the case studies reported a change in action (e.g. management or policy change), and a further 40% anticipated that a change would result from the work. To a large extent the impact was attributed to a well conducted science-practice Interaction Process (>70%). The main reported advantages of the concept included: increased concept awareness and communication; enhanced participation and collaboration; production of comprehensive science-based knowledge; and production of spatially referenced knowledge for input to planning (91% indicated they had acquired new knowledge). The limitations were mostly case-specific and centred on methodology, data, and challenges with result implementation. The survey highlighted the crucial role of communication, participation and collaboration across different stakeholders, to implement the ES concept and enhance the democratisation of nature and landscape planning. In Special Issue Synthesizing OpenNESS.
Frédéric Merienne - One of the best experts on this subject based on the ideXlab platform.
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Human factors consideration in the Interaction Process with virtual environment
International Journal on Interactive Design and Manufacturing, 2010Co-Authors: Frédéric MerienneAbstract:New requirements are needed by industry for computer aided design (CAD) data. Some techniques of CAD data management and the computer power unit capabilities enable an extraction of a virtual mock-up for an interactive use. CAD data may also be distributed and shared by different designers in various parts of the world (in the same company and with subcontractors). The use of digital mock-up is not limited to the mechanical design of the product but is dedicated to a maximum number of trades in industry. One of the main issues is to enable the evaluation of the product without any physical representation of the product but based on its virtual representation. In that objective, most of main actors in industry domain use virtual reality technologies. These technologies consist basically in enabling the designer to perceive the product in design Process. This perception has to be rendered to guarantee that the evaluation Process is done as in a real condition. The perception is the fruit of alchemy between the user and the VR technologies. Thus, in the experiment design, the whole system human-VR technology has to be considered.
Andrei P Kirilyuk - One of the best experts on this subject based on the ideXlab platform.
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Unreduced Complex Dynamics of Real Computer and Control Systems
2015Co-Authors: Andrei P KirilyukAbstract:The unreduced dynamic complexity of modern computer, production, communication and control systems has become essential and cannot be efficiently simulated any more by traditional, basically regular models. We propose the universal concept of dynamic complexity and chaoticity of any real Interaction Process based on the unreduced solution of the many-body problem by the generalised effective potential method. We show then how the obtained mathematically exact novelties of system behaviour can be applied to the development of qualitatively new, complex-dynamical kind of computer and control systems.
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Electron as a Complex-Dynamical Interaction Process
2005Co-Authors: Andrei P KirilyukAbstract:A system of two initially homogeneous, physically real fields uniformly attracted to each other is considered as the simplest basis of the self-developing world structure. It is shown that the system is unstable against periodic cycles of self-amplified, essentially nonlinear squeeze of its extended part to a small volume around randomly chosen centre, followed by the reverse extension. The resulting spatially random pulsation, or "quantum beat", is observed as (massive) elementary particle such as the electron. The property of mass is then universally and consistently defined as temporal rate of such dynamically chaotic and essentially nonlinear quantum beat, without introduction of any additional entities. The obtained picture can be considered as complex-dynamical completion of the "double solution" concept of Louis de Broglie. The dynamically emerging wave-particle duality, quantum discreteness, indeterminacy, space, and time lead to the equations of special relativity and quantum mechanics, providing their causal explanation and explicit unification. The elementary particle structure, its intrinsic properties, quantum and relativistic behaviour are obtained thus all together, within the unified analysis of the unreduced Interaction Process leading to the universal concept of dynamic complexity. The same complex-dynamical Process accounts for the universal gravitation and general relativity. The electromagnetic, weak, and strong types of Interaction between particles also constitute integral, dynamically unified parts of quantum beat Processes inside elementary particles. The classical, dynamically localised behaviour emerges in a closed system as a higher complexity level corresponding to formation of elementary bound systems (like atoms).
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Emerging Consciousness as a Result of Complex-Dynamical Interaction Process
2004Co-Authors: Andrei P KirilyukAbstract:A quite general Interaction Process within a multi-component system is analysed by the extended effective potential method, liberated from usual limitations of perturbation theory or integrable model. The obtained causally complete solution of the many-body problem reveals the phenomenon of dynamic multivaluedness, or redundance, of emerging, incompatible system realisations and dynamic entanglement of system components within each realisation. The ensuing concept of dynamic complexity (and related intrinsic chaoticity) is absolutely universal and can be applied to the problem of consciousness that emerges now as a high enough, properly specified level of unreduced complexity of a suitable Interaction Process. This complexity level can be identified with the appearance of bound, permanently localised states in the multivalued brain dynamics from strongly chaotic states of unconscious intelligence, by analogy with classical behaviour emergence from quantum states at much lower levels of world dynamics. We show that the main properties of this dynamically emerging consciousness (and intelligence, at the preceding complexity level) correspond to empirically derived properties of natural versions and obtain causally substantiated conclusions about their artificial realisation, including the fundamentally justified paradigm of genuine machine consciousness. This rigorously defined machine consciousness is different from both natural consciousness and any mechanistic, dynamically single-valued imitation of the latter. We use then the same, truly universal concept of complexity to derive equally rigorous conclusions about mental and social implications of the machine consciousness paradigm, demonstrating its indispensable role in the next stage of civilisation development.
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universal gravitation as a complex dynamical Process renormalised planckian units and the spectrum of elementary particles
arXiv: General Relativity and Quantum Cosmology, 1999Co-Authors: Andrei P KirilyukAbstract:The new, complex-dynamical mechanism of the universal gravitation naturally incorporating dynamical quantization, wave-particle duality, and relativity of physically emerging space and time (quant-ph/9902015,16) provides the realistic meaning and fundamentally substantiated modification of the Planckian units of mass, length, and time approaching them closely to the extreme values observed for already discovered elementary particles. This result suggests the important change of research strategy in high-energy/particle physics, displacing it towards the already attained energy scales and permitting one to exclude the existence of elementary objects in the inexplicably large interval of parameters separating the known, practically more than sufficient set of elementary species and the conventional, mechanistically exaggerated values of the Planckian units. This conclusion is supported by the causally complete (physically and mathematically consistent) picture of the fundamental levels of reality derived, without artificial introduction of any structure or "principle", from the unreduced analysis of the (generic) Interaction Process between two primal, physically real, but a priori structureless entities, the electromagnetic and gravitational protofields. The naturally emerging phenomenon of universal dynamic redundance (multivaluedness) of Interaction Process gives rise to the intrinsically unified hierarchy of unreduced dynamic complexity of the world, starting from the lowest levels of elementary objects, and explains the irreducible limitations of the basically single-valued approach of the canonical science leading to the well-known "mysteries", separations, and loss of certainty.