Mosaic imaging with spatial light modulator technology

Diffractive wavefront control with spatial light modulator technology has been successfully demonstrated both as a means of steering optical wavefronts and for compensating large optical aberrations. We describe the use of a spatial light modulator operating as a programmable diffractive optic to record extended-field-of-view mosaic images centered about a large off-axis field angle. A gimbaled primary mirror allows the nominal viewing angle to be varied, and diffractive wavefront steering allows images to be acquired at discrete increments in the field angle about the nominal angle. Diffractive wavefront compensation corrects aberrations associated with the primary mirror orientation and changes in field angle introduced by diffractive wavefront steering. A time sequence of images recorded at discrete increments in the field angle is then digitally combined to create a high-pixel-count mosaic image. The effects of diffraction efficiency and wavelength-dependent wavefront errors on image quality are analyzed.     

TESTS OF FIRE-BRICK MADE FROM GANISTER,FLINT CLAY,AND PLASTIC CLAY MIXTURES,WITH SPECIAL REFERENCE TO SPALLING1

Influence of the alumina-silica ratio on properties of fire-brick.—Five experimental batches of fire-brick were made by mixing various proportions of ganister, flint clay and plastic clay in such a way as to vary the silica content from 53 to 77 per cent and the alumina content from 43 to 20 per cent. (1) The fusion points were found only slightly lower than those of corresponding pure silica-alumina mixtures. (2) Load tests at high temperature showed that the behavior under compression does not depend on chemical composition so much as on other factors such as the temperature of burning. (3) The resistance to spalling , as tested by alternate heating and dipping in cold water, was found to decrease as the temperature of burning was increased from 1300° to 1400 °C. The higher silica bricks were relatively more resistant at the lower temperature but not so at 1400 °C. Therefore the substitution of ganister for flint clay increases the resistance to spalling at moderate operating temperatures but is of no advantage at 1400° or above.     

Polymer modified mixed metal alkoxide-metal acetyl acetonate sol-gel materials

Summary Metal acetyl acetonates of aluminum, zirconium and zinc have been successfully incorporated into poly (tetramethylene oxide) modified TEOS based materials using sol-gel chemistry. Incorporation of these metal acetyl acetonates required modification of the reaction scheme developed earlier to incorporate titanium(IV) isopropoxide. Gelation rates and the physical properties of the subsequent gelled materials varied as a function of the metal acetyl acetonate used.     

General parameterised refinement and recursion for the M-net calculus

The algebra of M-nets, a high-level class of labelled Petri nets, was introduced in order to cope with the size problem of the low-level Petri box calculus, especially when applied as semantical domain for parallel programming languages. General, unrestricted and parameterised refinement and recursion operators, allowing to represent the (possibly recursive and concurrent) procedure call mechanism, are introduced into the M-net calculus.     

Victims into perpetrators.

Many psychotherapy clients hold "victim formulations" of their problems. They conceive their problems in such a way that their source, and thus their resolution, lies outside the clients' personal control. This article details a therapeutic strategy for aiding clients with such problem formulations. This strategy includes (1) reformulating these problems into "perpetrator formulations" (i.e., reconstructions wherein the problem is portrayed as being created by actions that clients are actively perpetrating) and thus are in good positions to alter; (2) getting these reformulations accepted by clients; and (3) encouraging clients to continue to enact their problem behaviors in certain carefully prescribed ways, and thereby to gain control over them. (PsycINFO Database Record (c) 2010 APA, all rights reserved)     

Information frameworks for conceptual engineering design

An information modeling approach is used to gain an understanding of the information and decision content of conceptual engineering design. Information frameworks are presented that attempt to represent the key decisions made during conceptual design. Elements of the frameworks are derived from results from design theory and methodology and decision theory. Using a number of products, the frameworks are demonstrated in simulated design situations. The models provide an explicit, generic and consistent perspective for identifying the information content of conceptual designs.     

Miniaturization of Sample Processing for Bioassays

LLNL has recently licensed its hand-held advanced nucleicacid analyzer, the HANAA, for commercial development. This (as is characteristic of other miniaturized, portable diagnostic instruments being developed around the world) typically still requires manual sample handling and preparation by skilled operators. Dielectrophoretic and acoustic manipulation of fluids and particles are techniques that have shown good promise to reduce the demands on manual sample preparation both for miniature and for table-top instrumentation.     

High-Assurance Service-Oriented Architectures

Assuring multiple quality attributes, such as reliability, availability, performance, security, and real-time response, for a variety of critical applications makes it essential to develop practical techniques for implementing high-assurance service-oriented systems.     

Twenty-five years of Engineering Mathematics

Twenty-five years of Engineering Mathematics