摘要:
Inclusion of a stabilizer selected from phenyl and naphthyl esters of benzene and naphthalene carboxylic acids and mixtures thereof in an article, e.g. a photographic element, comprising an organic dye or precursor thereof increases stability of the dye against ultraviolet radiation. Particularly good results are achieved when the stabilizer is dispersed in a polymer of relatively high solubility parameter and low crystallinity.
摘要:
The invention is a process for making porous amine/aldehyde structures or powders comprising solid approximately-spherical cross-linked particles of less than 10 microns, said process comprising electrolyzing aqueous solutions of urea-formaldehyde prepolymer, melamine-formaldehyde prepolymer or mixtures thereof under electrolysis conditions sufficient to initiate condensation polymerization and formation of said structures or powders. The structures are all broadly designated as open pore urea-formaldehyde structures (OPUF) even though, of course, the ones made from melamine and formaldehyde without urea will have no urea in them. If the reactor is stirred during polymerization powders consisting of primary spherical particles and small porous agglomerates, are formed.
摘要:
A vehicle incorporating a hybrid propulsion system. In one form, the vehicle may be an aircraft such that the system includes gas turbine engines as a first motive power source, and one or more battery packs as a second motive power source. Through selective coupling to an electric motor that can in turn be connected to a bladed rotor or other lift-producing device, the motive sources provide differing ways in which an aircraft can operate. In one example, the gas turbine engines can provide operation for a majority of the flight envelope of the aircraft, while the battery packs can provide operation during such times when gas turbine-based motive power is unavailable or particularly disadvantageous. In another example, both sources of motive power may be decoupled from the bladed rotor such that the vehicle can operate as an autogyro. In another mode of operation, the movement of a bladed rotor can be both decoupled from the sources of propulsion as well as fixed relative to the aircraft such that the aerodynamic surfaces formed on the bladed rotors can act as a fixed wing. In another particular form, the vehicle may be ground-based or water-based.
摘要:
A composition and method of storing and releasing fuel gas such as hydrogen, methane or natural gas is provided which utilizes lightly crosslinked high density polyethylene pellets. Fuel gas is stored by placing the pellets in a reaction chamber which is heated to a temperature slightly above the crystalline melting point of the pellets, followed by the introduction of fuel gas into the chamber. The fuel gas permeates the pellets and becomes contained therein upon cooling of the pellets under pressure. The fuel gas may be stored indefinitely in the pellets at ambient temperature. When release of the fuel gas is desired, the pellets are incrementally metered into a discharge chamber and are heated to a temperature above the crystalline melting point of the pellets under a pressure from about 5 to 200 psi such that the fuel gas is released from the pellets for use. The expended pellets may then be recycled for further fuel gas storage.
摘要:
A micropore open cell foam composite and a method for manufacturing a micropore open cell foam composite wherein the micropore open cell foam composites comprise a micropore open cell foam having an open cell content of greater than about 80% volume and an average pore size of about 200 microns or less and a phase change material in the open cell foam in the amount of 80% volume or greater.
摘要:
A composition for thermal energy storage or thermal energy generation comprising a silica based gel or dry powder in the form of silica particles containing a water/urea phase change material for thermal energy storage or an endothermic or exothermic compound for thermal energy generation. The water/urea phase change material stores and releases at least 50 cal/gm of thermal energy in freezing and melting, and has a melting and a freezing point in the range of -11.degree. C. to -15.degree. C. The endothermic compound is preferably ammonium nitrate, urea, or combinations thereof. The exothermic compound is preferably calcium oxide or calcium chloride. The thermal energy storage composition may find use in a variety of applications including medical wraps, food servingware, and "blue ice" for cold packs or food storage. The thermal energy generation composition may find use as medical wraps, food servingware, and refrigerators when endothermic and medical wraps, food servingware, heaters, stadium seats, boots, vests, caps ear muffs, and scarves when exothermic.
摘要:
Free flowing, conformable powder-like mix of silica particles and a phase change material (PCM) is provided. The silica particles have a critical size of about 0.005 to about 0.025 microns and the PCM must be added to the silica in an amount of 75% or less PCM per combined weight of silica and PCM. The powder-like mix can be used in tableware items, medical wraps, tree wraps, garments, quilts and blankets, and in cementitious compositions of the type in which it is beneficial to use a PCM material. The silica-PCM mix can also be admixed with soil to provide a soil warming effect and placed about a tree, flower, or shrub.
摘要:
A composite useful in thermal energy storage, said composite being formed of a polyethylene matrix having a straight chain alkyl hydrocarbon incorporated therein, said polyethylene being crosslinked to such a degree that said polyethylene matrix is form stable and said polyethylene matrix is capable of absorbing at least 10% by weight of said straight chain alkyl hydrocarbon; the composite is useful in forming pellets or sheets having thermal energy storage characteristics.
摘要:
Large void-free castings of polyethylene can be made by blending high density polyethylene pellets with low density polyethylene powder, followed by heating to above the melting point of the low density polyethylene and below, or only slightly above, the melting point of the high density polyethylene. Flame proofing additives, crosslinking agents and other materials can be readily incorporated into the blend before fusing. The mixture of high density and low density polyethylene significantly reduces the amount of shrinkage which takes place during the cooling from the melting temperature to ambient temperature. The low density polyethylene should have a sufficiently low melt viscosity so that it will flow under small pressures above the melting temperature.
摘要:
Large void-free castings of polyethylene can be made by blending high density polyethylene pellets with low density polyethylene powder, followed by heating to above the melting point of the low density polyethylene and below, or only slightly above, the melting point of the high density polyethylene. Flame proofing additives, crosslinking agents and other materials can be readily incorporated into the blend before fusing. The mixture of high density and low density polyethylene significantly reduces the amount of shrinkage which takes place during the cooling from the melting temperature to ambient temperature. The low density polyethylene should have a sufficiently low melt viscosity so that it will flow under small pressures above the melting temperature.