Abstract:
Optical devices utilizing flakes (also called platelets) suspended in a host fluid have optical characteristics, such as reflective properties, which are angular dependent in response to an AC field. The reflectivity may be Bragg-like, and the characteristics are obtained through the use of flakes of liquid crystal material, such as polymer liquid crystal (PLC) materials including polymer cholesteric liquid crystal (PCLC) and polymer nematic liquid crystal (PNLC) material or birefringent polymers (BP). The host fluid may be propylene carbonate, poly(ethylene glycol) or other fluids or fluid mixtures having fluid conductivity to support conductivity in the flake/host system. AC field dependent rotation of 90° can be obtained at rates and field intensities dependent upon the frequency and magnitude of the AC field. The devices are useful in providing displays, polarizers, filters, spatial light modulators and wherever switchable polarizing, reflecting, and transmission properties are desired.
Abstract:
The invention provides methods and compositions for identifying, i.e., selecting and/or screening for regulator molecules such as polypeptides and/or U1 SnRNAs which irectly or indirectly influence, e.g., induce or suppress, the transcriptional activation of a target transcriptional regulatory region in a eukaryotic host cell. Also provided are regulator molecules identified by such methods, and methods of isolating polynucleotides encoding regulator molecules identified by these methods.
Abstract:
CMOS buffer circuits are provided having multiple stages of driving transistors defining a fast "1" data path and a fast "0" data path for transmitting data signals from the input to output of the buffer. Each stage before the last stage in each of the data paths has at least one nulling transistor coupled to the driving transistor of the stage. Separate from the data paths, the nulling transistors of each data path are operated to synchronously null the driving transistors of the data path to prepare such driving transistors for the next fast transition in the input data signal. Another nulling transistor may be also coupled to the driving transistor of each stage before the last stage of each data path which prevents the data path from floating when the data path is not transmitting a transition of the input signal to output of the buffer. The CMOS buffer circuits are suitable for driving large capacitive loads optimally over any range of input signal frequency, restoring slow transitioning digital signals, or driving highly resistive RC interconnect lines.
Abstract:
Novel nitroaromatic compounds and immunogenic conjugates comprising a novel nitroaromatic compound and a carrier protein are disclosed. The invention further presents monoclonal antibodies highly specific for the claimed nitroaromatic compounds, the compounds' protein conjugates, the compounds' reductive byproducts, and adducts formed between the compounds and mammalian hypoxic cell tissue proteins. The invention is further directed to methods for detecting tissue hypoxia using immunohistological techniques, non-invasive nuclear medicinal methods, or nuclear magnetic resonance. Diagnostic kits useful in practicing the methods of claimed invention are also provided.
Abstract:
Data representing the image of an original picture having high resolution are first acquired. The data are then processed in accordance with a blurring function, which can be a randomly distributed point spread function. Processing can be carried out either in object space or in spatial-frequency space. In object space a multi-dimensional convolution is required. In the spatial frequency domain, processing is performed by a pointwise product of data representing the Fourier transform of the original image and the Fourier transform of the blurring function. The resulting blurred image is thereby coded such that the original scene is no longer discernible, but can be recovered provided the blurring function is known. Additionally, this blurred image can be shown to contain the detail of the original but can be stored or transmitted as data which are compressed by compression ratios which can range from 2 to 100. The compressed data can be restored to provide an image with detail like the original by inverse filtering using data representing the Fourier transform of the blurring function.
Abstract:
Eyepiece optical systems having arrangements of surfaces where light is refracted or diffracted provide eyepieces with fewer elements and more compact designs than comparable, conventional eyepiece designs. These eyepiece optical systems have three elements each with positive focussing power, and provide a wide field-of-view of about 70.degree. and an eye relief of approximately 80% of the total focal length of the eyepiece. One embodiment has (from the eye side) a refracting, meniscus, positive element with a surface concave toward the eye, a bi-convex element having a refracting convex surface and a second refracting convex surface, and a refractive/diffractive doublet element with a refracting convex surface and diffracting surface (each element being of positive power). Another embodiment, from the eye side has a first diffractive/refractive doublet having a diffracting surface and a convex refracting surface, an equi-convex element having two refracting convex surfaces and a second refracting/diffracting element having a diffracting surface and a convex refracting surface.
Abstract:
In order to avoid the use of complex transform and correlation techniques for estimating the velocity of a target from which ultrasonic RF bursts are received as return echoes, the time of occurrence of successive returns are compared with a plurality of delay trajectories each representing a different target velocity. The trajectory with which the returns match with minimum variance, or maximum likelihood of being in time coincidence, provides an estimate of the velocity of the target. In different embodiments the RF return, the envelope of the return or the quadrature components thereof are processed to determine to which delay trajectory they are most proximal. The search for the delay trajectory is called a "butterfly search" in two dimensions (slow time or transmitted pulse repetition periods and fast time or range). Each butterfly line corresponds to a distinct linear velocity. The criterion that a signal corresponding to the returns should be equal in amplitude at all points along the correct trajectory may be used for envelope and RF signals. The use of the quadrature components is preferred in noisy environments, such as where the target is the scatterers in blood flow and blood flow velocity is to be determined. In the embodiment using the quadrature components, each butterfly line is searched for corresponding normalized likelihood ratio maxima, since such maxima occur on the correct butterfly line. The butterfly search can be implemented with less computation complexity than correlation or transform operations heretofore used for blood flow velocity estimation, and with fewer repeat pulses, and the results are more accurate in the presence of noise.
Abstract:
A chromatic aberration-corrected optical system for broad-band through-the-lens (TTL) imaging and position detection of alignment marks deposed on a substrate located at the exposure plane of an exposure apparatus, for example, a stepper machine, uses a first projection lens capable of focusing a first broad-band alignment illumination and a second exposure illumination onto the substrate. A second achromat lens and a third refractive/diffractive hybrid lens are configured and designed to provide, in conjunction with the first projection lens, longitudinal and lateral chromatic aberration correction over a wavelength range from about 550-650 nm of the broad-band alignment illumination.
Abstract:
An immunogenic conjugate which is the reductive amination product of an immunogenic capsular polymer fragment having at least one reducing group and derived from a bacterial capsular polymer of a bacterial pathogen, and a bacterial toxin or toxoid. The invention also relates to methods for the preparation of the conjugates, a vaccine containing the conjugates which elicits effective levels of anti-capsular polymer antibodies in humans. Also disclosed are methods for inducing active immunization against systemic infection in young mammals caused by bacterial pathogens comprising the administration of an immunogenic amount of the above-described conjugate. In a preferred embodiment, the capsular polymer fragment prior to conjugation has at least one aldehyde group at each end of the fragment. The final conjugate made with such capsular polymers has a lattice or network structure, and provides extremely high levels of anti-capsular polymer antibodies in infants.
Abstract:
A diffractive/refractive hybrid lens for use in an optical data storage system as an objective is provided by a convex-plano singlet having a refractive element defined by plano-convex surfaces and a diffractive element defined by a Fresnel zone-like pattern on the plano surface which together provide the total power of the lens. The refractive lens is made of a high index, high dispersion glass so that the curvature and thickness of the refractive lens is minimized while providing a large numerical aperture (at least 0.45) at the expense of increased longitudinal chromatic aberration, which are compensated by the diffractive element and without the need for one or more additional curved surfaces as in low index biaspheric glass objective lenses for chromatic and mono-chromatic aberration reduction, which increases the thickness and curvatures of the lens. The invention enables longitudinal chromatic aberration to be corrected for at least a 10 nm band width around a center wavelength over a 20 nm range, as results when different lasers are used and as laser power varies during optical data storage on an optical data storage device (an optical disk). The thin, light weight low curvature achromat has maximum tolerance for various possible manufacturing errors such as decentering, variations in thickness of the lens, tilt and focal length especially for on-axis field of view less than 2.degree. while providing a very high quality spot (Strehl ratio of at least 0.9.).