Abstract:
This invention provides systems, materials, and methods of environmental modification with climate control materials. Climate control materials may have different properties such as optical properties, wettability, porosity, buoyancy, thermal conductivity, imperviousness, strength/breaking, source of materials, and biodegradability, that may assist with local environmental modification. Climate control materials may also incorporate different designs that may allow them to advantageously affect the local albedo and evaporation rate and thereby modify the local environment. Effects of such climate control materials may be reversible and may minimize ecological harm.
Abstract:
A switching device for controlling fluid motion. The device includes a capillary filled with a first fluid into which a wall-confined bubble of a second fluid is introduced to achieve a first switching event. Capillary geometry and wetting properties provide a pressure-related asymmetric energy potential distribution for controlling the flow of the bubble, and the device is called an asymmetric bubble chamber, or ABC. The bubble is initially trapped in an energy potential well, and upon increase of its volume moves from the well into a region of low energy potential to achieve a second switching event. The first switching event may be blocking of a fluid channel or reflection of an optical beam in an optical crosspoint switch, while the second switching event may be unblocking of a fluid channel or restoration of transmission of an optical beam. The increase in bubble volume between the first and second switching events can act as the stroke of a fluidic piston to pump a volume the first fluid within the capillary. The device can be employed to thermally degas a liquid. The use of large-magnitude geometry-related energy potentials permits rapid cyclical operation of the device in a manner resistant to mechanical shock.
Abstract:
An ink jet print head with a substrate defining an ink aperture. A number of ink energizing elements are located on the major surface of the substrate. A barrier layer is connected to the upper surface, and peripherally encloses an ink manifold. The barrier encompasses the ink aperture. An orifice plate is connected to the barrier layer, spaced apart from the substrate's major surface, enclosing the ink manifold. The plate defines a number of orifices, each associated with a respective ink energizing element. The ink manifold is an elongated chamber having opposed ends defined by end wall portions of the barrier layer. The barrier end wall portions each have an intermediate end wall portion protruding into the manifold. Columnar structures placed at predetermined locations, including locations at the end of the ink aperture, and extending from the major surface to the orifice plate control the migration of coalescing bubbles.
Abstract:
A micromachined signal switch for vertical displacement includes a fixed substrate having at least one signal line and includes an actuator substrate that is thermally actuated to selectively connect a second signal line to the first signal line. The actuator substrate includes a plurality of legs constructed of materials having sufficiently different coefficients of thermal expansion to create stresses that arc the legs when the legs are subjected to elevated temperatures. In the preferred embodiment, a first material for forming the legs is silicon and a second material is a metal, such as electroplated nickel. A displaceable contact region may be formed integrally with the actuator substrate, but the contact region is preferably a region of an interposer substrate between the fixed substrate and the actuator substrate. The displaceable contact region has a raised position in which the signal line on the fixed substrate is "off" and has a lowered position in which a conductive member on the contact region is positioned to provide electrical communication to the signal line.
Abstract:
A process for removing residual sulfur from a hydrotreated naphtha feedstock is disclosed. The feedstock is contacted with molecular hydrogen under reforming conditions in the presence of a less sulfur sensitive reforming catalyst, thereby converting trace sulfur compounds to H.sub.2 S, and forming a first effluent. The first effluent is contacted with a solid sulfur sorbent, removing the H.sub.2 S and forming a second effluent. The second effluent is contacted with a highly selective reforming catalyst under severe reforming conditions.
Abstract:
A pretreatment method is disclosed for enhancing the selectivity and increasing the stability of a reforming catalyst comprising a large-pore zeolite containing at least one Group VIII metal. In this method, the catalyst is reduced in reducing atmosphere at a temperature of from 250.degree. C. to 650.degree. C., exposed to an oxygen-containing gas, treated in a reducing atmosphere at from 120.degree. C. to 260.degree. C., and maintained at a temperature of from 370.degree. C. to 600.degree. C. in a reducing atmosphere.
Abstract:
A flow channel suitable for use with a peristaltic pump comprises: an upper wall having a bowed upward shape; a lower wall having one of a bowed downward shape and a flat shape; and one or more spacers between the upper wall and the lower wall disposed between lateral edges of the upper and lower walls, each spacer having a height. The upper wall, lower wall, and the one or more spacers define a lumen. When the upper wall is compressed toward the lower wall by compressing members, the one or more spacers limit vertical movement of the compressing members such that the lumen is maintained in an under-occluded condition. In some cases, the bowing of one of the upper and lower walls has a recurved shape.
Abstract:
A method for cooling the temperature of a body of water having a top surface exposed to sunlight comprises distributing balls such that they lie on, and in direct contact with, at least part of the top surface, the at least part of the top surface characterized prior to the distribution by a pre-distribution surface area; The balls have diameters within a range of 100 microns to 3 mm, and albedos within a range of 0.15 to 1.0. The surfaces of the balls are hydrophilic, such that after the distribution a total wetted surface area greater than the pre-distribution surface area of the water is provided, facilitating the cooling. In one embodiment, the body of water is a natural or unnatural lake or bay.
Abstract:
Embodiments generally relate to methods and apparatuses for generating ice. In one embodiment, at a generation location, a material is introduced to water, and the temperature of the combination of the water and the material is lowered until ice forms; then at a target location, the formed ice is deployed on a top surface of a body of water, or of a pre-existing body of ice, or of ground. The formed ice has an albedo greater than or equal to 0.15. The formed ice contains light scattering centers created by the introduced material. The material comprises hollow particles.
Abstract:
Embodiments generally relate to methods and apparatuses for conserving water in a reservoir. In one embodiment, the method comprises deploying onto the top surface of water in a reservoir a floatable device with a wettable lower surface. The device comprises a first element and a second element, the first element providing the device with a high albedo upper surface. In one embodiment the first element comprises a plurality of highly reflective particles and the second element comprises a binder configured to hold the reflective particles together.