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Theory of On-axis Intensity Distribution in Thermal Lensing (LQ-10 High Power Laser Window Program)
As part of its over-all program in the identification, preparation, and application of materials for use as high-power infrared laser windows, AFCRL has investigated theoretically and experimentally the thermal lensing caused by the distortion and defocusing of a laser beam traversing a material medium. In the report, the vector Kirchhoff approximation is applied to obtain the diffraction field due to a nonuniform laser beam normally incident on an optically isotropic, annular-shaped solid lens. Detailed computations of the on-axis intensity distribution versus time in both abstract and real variables are presented for Gaussian beams incident on various transmitting materials at 10.6 micrometers. The results of the computations demonstrate the role played by induced thermal stresses, incident beam shape, refocused beam, center-chopped beam, the the mating of two compensating materials. Two rough figures of merit are given for rating any window's optical and mechanical-optical performance. It is shown how lensing depends on material parameters. (Author).
Architecture and Choreography
Architecture and Choreography: Collaborations in Dance, Space and Time examines the field of archi-choreographic experiments—unique interdisciplinary encounters and performed events generated through collaborations between architects and choreographers. Forty case studies spanning four decades give evidence of the range of motivations for embarking on these creative endeavors and diverse conceptual underpinnings, generative methods, objects of inquiry, and outcomes. Architecture and Choreography builds histories and theories through which to examine these works, the contexts within, and processes through which the works emerged, and the critical questions they raise about ways to work toge...
Medieval Women, Material Culture, and Power
This book argues that the impressive range of belongings that can be connected to Duchess Matilda Plantagenet allows us to perceive elite women's performance of power, even when they are largely absent from the official documentary record. This work was published by Saint Philip Street Press pursuant to a Creative Commons license permitting commercial use. All rights not granted by the work's license are retained by the author or authors.
Modeling Magnetospheric Plasma
Published by the American Geophysical Union as part of the Geophysical Monograph Series, Volume 44. Existing models of the plasma distribution and dynamics in magnetosphere / ionosphere systems form a patchwork quilt of different techniques and boundaries chosen to define tractable problems. With increasing sophistication in both observational and modeling techniques has come the desire to overcome these limitations and strive for a more unified description of these systems. On the observational side, we have recently acquired routine access to diagnostic information on the lowest energy bulk plasma, completing our view of the plasma and making possible comparisons with magnetohydrodynamic c...
Handbook of Thermoplastics
Offers coverage of all known commodity, transitional, engineering, high-temperature and high-performance thermoplastics, and analyzes emerging developments in the creation of new thermoplastics. The text examines: important issues in the field for each substance discussed, including history, development and commercialization; polymer formation mechanisms and process technologies; the affect of structural and phase characteristics on properties; the commercial relevance of thermoplastic blends, alloys, copolymers and composites; and more.
