A method of coating pigment particles is described for preventing degradation and discoloration by ultraviolet light. The chemical species utilized serve as recombination sites for the electrons and holes produced by the radiation. The chemical species selected for a particular pigment should be one equivalent such that stable oxidation stages are formed differing by one electronic charge. Zinc oxide pigments coated with ferri- and ferrocyanide are discussed as an example. This invention relates to a method for welding thin sheet metal members by the simultaneous bonding and shaping into an essentially planar configuration without the addition of a bonding material. This is accomplished by explosively welding overlapped sheets while simultaneously bending them such that the major portions of the two sheets are left in a single plane. The method furnishes a simple and economical method of welding thin sheet aluminum and titanium with bonds which exhibit the strength of the parent metal. NARROW BAND FM SYSTEM FOR NASA Case No. GSC-11261-1 Canada, Great Britain, France, Address inquiries to: Goddard Space Flight Center Attn: Patent Counsel Mail Code: 204 Greenbelt, MD 20771 [Corresponding U.S. Patent-Application Pending] The Narrow Band FM transmitter transmits voice signals on a FM carrier signal. The transmitter includes preemphasis for flattening the frequency spectrum. The receiver includes a demodulator for demodulating the FM carrier with decreasing band width as a function of the carrier strength. Limiting means are employed for decreasing the carrier strength as the incoming carrier-to-noise ratio decreases and a deemphasis circuit for restoring the frequency spectrum of the original voice signal. LONG RANGE LASER TRAVERSING SYSTEM NASA Case No. GSC-11262-1 Canada, Great Britain, France, Address inquiries to: Goddard Space Flight Center Attn: Patent Counsel Mail Code: 204 Greenbelt, MD 20771 [Corresponding U.S. Patent-Application Pending] The relative azimuth bearing between first and second space terrestrial points (which may be obscured from each other by intervening terrain) is measured by placing at one of the points a laser source for projecting a collimated beam upward in the vertical plane. The collimated laser beam is detected at the second point by positioning the optical axis of a receiving instrument for the laser beam in such a manner that the beam intercepts the optical axis. In response to the optical axis intercepting the beam, the beam is deflected into two different ray paths by a beam splitter having an apex located on the optical axis. The energy in the ray paths is detected by separate photoresponsive elements that drive logic networks. 12 вродров ONE MILE The development and chemical composition of a substance to prevent fogging of windows, mirrors, glasses, space suit visors, and similar optical equipment are discussed. The materials consists of an alkyl glyceral sulfonate, water, and a time extender in the form of an oil. The materials is expected to prevent fogging of visual surfaces for periods of five hours or more during maximum metabolic loads. |