Abstract:
An IOP control valve is disclosed. The IOP control valve comprises a corrugated membrane and a housing including a fluid inlet and a fluid outlet. The corrugated membrane is anchored within the housing to form a reference chamber on a first side of the corrugated membrane and a fluid flow channel on a second opposing side of the membrane. The reference chamber has a reference chamber pressure representative of atmospheric pressure. The fluid flow channel can selectively increase and decrease in size to permit fluid to flow from the fluid inlet to the fluid outlet. The corrugated membrane is configured to affect flow through the fluid flow channel from the fluid inlet to the fluid outlet by deflecting in response to pressure differentials of the reference chamber pressure and the fluid flow channel pressure acting on the opposing sides of the corrugated membrane.
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:
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:
Embodiments generally relate to apparatuses for generating composite ice. In one embodiment, an apparatus comprises a water inlet system configured to receive water; a water treatment system configured to operate on water delivered from the water inlet system; a cooling system configured to operate on the treated water delivered from the water treatment system to generate ice; and an ice delivery system configured to output the generated ice. The water treatment system introduces a material to the water delivered from the water inlet system, the material being selected such that the subsequently generated ice has an albedo greater than 0.15.
Abstract:
An implantable MEMS package for the treatment of an ocular condition is provided. The MEMS package includes an outer portion; an active portion attached to the outer portion, the active portion including a fluid regulating element having a moving element; and a fluidic channel at an interface of the outer portion and the active portion. The fluidic channel is formed in at least one of the outer and active portions and permits fluid communication from the MEMS package to the fluid regulating element. A method for forming a MEMS package as above is also provided. An ocular implant for treating glaucoma including an inlet tube for receiving aqueous humor; a MEMS package as above, coupled to the inlet tube; a control system to control the MEMS package; and an outlet tube for draining aqueous humor at a drainage location, is provided.
Abstract:
A selectable IOP valve for implantation in an eye of a patient controls IOP and/or bleb pressure. The valve includes a drainage tube configured to convey aqueous from an anterior chamber of an eye and includes a selectable flow control valve in fluid communication with the drainage tube and configured to control flow rates of the aqueous. The valve system includes a plurality of flow control pathways arranged to operate in parallel with each other, each of the flow control pathways being in communication with an entry port to the valve system. A flow control mechanism controls aqueous flow through the pathways. Methods and systems are also disclosed.
Abstract:
The invention provides and systems, materials, and methods for environmental modification using climate control materials. Climate control materials may be applied locally and may have various material properties that may alter a local albedo and/or evaporation rate, and thereby affect the local environment. Climate control materials may also be reversible. The climate control materials may be deployed in different manners.