Nonlinear Science (1997) / Chapter Skim
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Chapter 4--Naval Needs, NRL Capabilities, and Nonlinear Science Research Opportunities
Chapter 4--Naval Needs, NRL Capabilities, and Nonlinear Science Research Opportunities
Pages 10-21
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From page 10... ...
Pattern recognition is important for a variety of problems of interest to the Navy, including the recognition of visual patterns in images, as well as Me recognition of temporal patterns in sonar signals and communications. These techniques are important both for reconnaissance, pattem-change recognition over long time scales and for target recognition and acquisition on much shorter time scales.
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From page 11... ...
The synchronization approach demonstrates that a chaotic system can be broken into parts and that, by duplicating of some of those parts and linking venous parts with chaotic signals, new behavior, such as synchronization, is possible. The main theme here is that the synthesis of new chaotic systems leads to interesting and potentially useful results, incIllding the synthesis of new signals and signal processing hardware.
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From page 12... ...
The principles of operation make use of developments in electronic neural networks, cellular automata, and related fields. The highly parallel architectures associated with neural network approaches are well suited to rapid signal processing for pattern recognition.
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From page 13... ...
that translates a high-level description of a device In terms of rods, joints, springs' and so forth, into machine executable code within the analytic environment descnbed below; A computational environment for the simulation and analysis of dynamical systems this environment should provide the user with a graphical interface Hat allows access to a comprehensive set of numerical algorithms for the analysis of dynamical systems; several good computational tools are available now, but standardization and further attention to software stability and maintenance are required; A scientific database manager that allows for storage and retrieval of the information generated in a study of a system; 4. Expert systems that check the results of the analysis for consistency with
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From page 14... ...
The propagation of detonations and deflagrations involves highly nonlinear processes. From a nonlinear science perspective, premixed flames are ideal dynamical systems.
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From page 15... ...
LASERS AND NONLINEAR OPTICS Coherent High-Power Semiconductor Laser Sources The invention of Me semiconductor laser diode in 1962 followed rapidly on the first observation of lasing from ruby, but early versions suffered from poor matenals grown techniques and required relatively high drive currents to operate. Modern materials grown techniques (e.g., molecular beam epitaxy)
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From page 16... ...
They obviously are marvelously rich nonlinear dynamical systems whose full potential can be realized only by discarding oversimplified theoretical models using ad hoc parameterization. A proper theoretical framework that has useful predictive power will require full understanding of the microscopic physics of the interaction of light with semiconductor media and consideration of longitudinal and transverse inhomogeneities in the laser structure.
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From page 17... ...
True lasing would require multipass configurations, and many challenges remain with regard to designing efficient reflectors that avoid damage from hot, gaseous x-ray laser media. The potential impact of nonlinear science on this emerging field is both broad and deep.
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From page 18... ...
The possible implications for applications of interest to the Navy strongly suggest that the nonlinear science and materials efforts at New should be involved actively in these developments. Organic Electronic Materials: Flexible Polymer[EDs ar~d[Nonlinear Optics As one important class of novel electronic materials, consider the conducting polymers and related organics.
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From page 19... ...
The possible implications for applications of interest to the Navy strongly suggest that the nonlinear science and materials efforts at NRL should be involved actively in these developments. Organic Electronic Materials: Flexible Polymer LEDs and Nonlinear Optics As one important class of novel electronic materials, consider the conducting polymers and related organics.
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From page 20... ...
A good example is the motion of an electron through a disordered conductor, which corresponds to a pinball scattering problem In the classical limit but gives universal conductance fluctuations in mesoscopic systems. Quantum chaos has been studied theoretically for many years in connection with the foundations of statistical mechanics and chemical dynamics and, recently, in connection with electronic conduction in metals and semiconductors.
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From page 21... ...
Recent work employing nonlinear mathematics and computer simulation accounts for the qualitative features of crack growth but still fails to account for the observed rates of crack propagation. Experiments designed to elucidate the nonlinear phenomena underlying crack growth are nearly nonexistent.
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