摘要:
Phosphorus impurities are removed from yellowcake by dissolving it in hydrochloric or sulfuric acid to a U.sub.3 O.sub.8 assay of at least 150 g/l at a pH of 2; precipitating uranium peroxide with hydrogen peroxide while keeping the pH between 2.2 and 2.6 and recovering the uranium peroxide from the phosphorus impurities remaining in solution.
摘要:
The present invention relates to pharmaceutical compositions and methods useful for the treatment of dermatological disorders, and in particular acne vulgaris and skin pigmentation disorders. Pharmaceutical compositions comprising one or more arginine, salicylic acid and/or azelaic acid that are useful for the treatment of dermatological diseases and the symptoms and underlying causes of such dermatological diseases are also disclosed.
摘要:
A pulse width encoded switching power supply, which may be electrically connected to an electroluminescent (EL) material is described. The power supply exploits both mechanical and electronic resonance principles to provide maximum emission from EL phosphor crystals using an LC tank circuit power supply design at specific frequency to maximize photon emission. Other possible applications are also described.
摘要:
An improved method for treating organic compounds present in soil, groundwater and other environments is disclosed. The method involves the use of a peroxygen compound and a chelated transition metal.
摘要:
An improved method and compositions for treating organic compounds present in soil, groundwater and other environments is disclosed. The method involves the use of a composition comprising a solid state, water soluble peroxygen compound and zero valent iron.
摘要:
A hydraulic process has been developed and a process to treat subterranean formations whereby the medium can maintain for a period of time a sufficient viscosity to function as a hydraulic medium and optionally to support particulate matter. Subsequently, the viscosity of the medium decreases to facilitate the removal of the medium.
摘要:
A polyurethane spray nozzle for high pressure abrasive aqueous slurries of limestone and the like. The nozzle is comprised of a hollow body of urethane having a restricted inlet and outlet with internal vanes adjacent the inlet to provide a swirling motion to the slurry. The polyurethane construction is characterized by a high degree of abrasion resistance with a slick surface to inhibit solids build up and a degree of flexibility to inhibit clogging of the vanes by solid pieces of limestone. In a modification the body may be made in a first piece while the vanes may be inserted therein in a second integral piece held together by a ring. An outwardly extending flange which may be reinforced with a metallic member is provided for connection to a pipe line source for the slurry. The flange portion connected to the pipe line source may be constructed of a softer polyurethane than the remainder of the spray nozzle to enhance the flange sealing connection.
摘要:
Means are provided for increasing the productivity of a hydrocarbon formation by modifying the formation in the vicinity of the borehole by a succession of treatments utilizing a first fluid which releases energy within the borehole and a second fluid modifying the fluid within the borehole. The means provides successive treatment of steam, carbon dioxide, oxygen, and inert gases in any order desired.
摘要:
Removing hydrogen sulfide from geothermal steam condensate is described whereby the hydrogen sulfide that is present in the condensate from a geothermal steam plant is oxidized with a peroxygen compound such as hydrogen peroxide in the presence of catalytic quantities of sodium vanadate under neutral to alkaline conditions.
摘要:
A set of hinges (1) that allow a user to open and close a set of removable rigid rooftop panels (5, 6) for a vehicle having a hardtop cover, such as a Jeep or sport utility vehicle, without being required to fully remove and store the rigid roof panels. The hinges may be locked in an open position using one or more hasps (24) integrated into the hinges.