Abstract: A screed corner comprises a screed base including substantially perpendicular nailing flanges and a bead leg extending away from each nailing flange. The bead has a horizontally disposed V-shaped cross section. A separate screed corner component is provided to be secured to arms of the bead and to close a gap in the screed base which is located in a volume comprising an intersection of a projection of each bead leg. The screed corner may be provided in a contour in sheet metal which can be readily bent to form a screed base. The screed corner component may comprise formed sheet metal. The corner component may comprise a sharp corner or may comprise a radius at its periphery. In one further form, the bead may comprise a substantially planar surface extending away from the nailing flange. In another, further form, the screed corner may be molded.

Abstract: An apparatus for detecting and determining a source azimuth for gamma radiation includes at least two scintillation crystals at angular offsets and directed toward a common plane of detection, photodetectors adjacent to each of the scintillation crystals for converting the light response of the scintillation crystals into distinct electrical signals, and a digital processing system configured to analyze spectral data from each electrical signal produced for each crystal. The digital processing system monitors a finite number of spectral windows corresponding to a selected set of radioisotopes, and uses one or more of the electrical signals to determine a signal intensity and a likely source azimuth for a detected radioisotope in the plane of detection. Another scintillation crystal directed outside of the common plane of detection may be used for three-dimensional detection. Related methods for detection and location of gamma ray sources are discussed.

Abstract: In a surface inspection system for detecting particles on a surface, a light source mounted to illuminate the surface provides multiple wavelength ranges of electromagnetic radiation. An optical detector produces an image of the surface. An optical signal is produced indicative of returned electromagnetic radiation at each of a plurality of the multiple wavelength ranges from a field of view on the surface. A processor operating on the optical signals resolves presence of a contaminant as a function of the optical signals, and produces a contaminant signal responsive to presence of a contaminant. A heating means positioned to evolve contaminants from the surface is responsively coupled to be activated in response to a contaminant signal. The multiple wavelength ranges comprise ultraviolet, visible, and infrared wavelengths. The processor comprises means to perform false color contrast stretching.

Abstract: A composition for radiation shielding or range of compositions which compositions may be used for a variety of radiation shielding applications. With proper adhesive selection and processing, the construction forms an integral bond with the craft as compatible adhesives form strong bonds. This eliminates the potential for delaminating associated with the use of metallic layered shielding. While prior art protects electronics with a direct coating to electronic packages, this approach allows larger equipment systems, such as optics, or spectrometers, to be shielded.

Abstract: A new method for the detection and correction of environmentally induced functional interrupts (or “hangs”) induced in computers or microprocessors caused by external sources of single event upsets (SEU) which propagate into the internal control functions, or circuits, of the microprocessor. This method is named Hardened Core (or H-Core) and is based upon the addition of an environmentally hardened circuit added into the computer system and connected to the microprocessor to provide monitoring and interrupt or reset to the microprocessor when a functional interrupt occurs. The Hardened Core method can be combined with another method for the detection and correction of single bit errors or faults induced in a computer or microprocessor caused by external sources SEUs.