536 results about "Cryogenic temperature" patented technology

A system, device and method for dilating an anatomical structure. Systems, devices and methods may comprise a therapeutic component configured to treat a paranasal sinus. Specific embodiments may use high frequency pressure waves and/or cryogenic temperatures.

A method for forming a nanowhisker of, e.g., a III-V semiconductor material on a silicon substrate, comprises: preparing a surface of the silicon substrate with measures including passivating the substrate surface by HF etching, so that the substrate surface is essentially atomically flat. Catalytic particles on the substrate surface are deposited from an aerosol; the substrate is annealed; and gases for a MOVPE process are introduced into the atmosphere surrounding the substrate, so that nanowhiskers are grown by the VLS mechanism. In the grown nanowhisker, the crystal directions of the substrate are transferred to the epitaxial crystal planes at the base of the nanowhisker and adjacent the substrate surface. A segment of an optically active material may be formed within the nanowhisker and bounded by heterojunctions so as to create a quantum well wherein the height of the quantum well is much greater than the thermal energy at room temperature, whereby the luminescence properties of the segment remain constant without quenching from cryogenic temperatures up to room temperature.

A bag, method of manufacture and process are disclosed for the cryopreservation of thermolabile substances. The bag is characterized as having substantially uniform thickness throughout its length and height. The bag features a radiused peripheral edge wall for stress relief and to provide the constant cross-section. A peripheral flashing circumscribes the radiused edge wall and provides a suitable purchase area for sealing so that the thus formed bag is less susceptible to fracture particularly when exposed to cryogenic temperatures. The uniform thickness of the bag promulgates uniform heat transfer to and from the contents of the bag in relation to any surrounding medium at a different temperature. The bag affords more space for efficient storage and reduces heat invasion into the contents of the bag when a plurality of bags are placed with their larger planar surfaces in contact with each other.

A superconducting system comprises a superconducting coil (3) mounted in a support (12). The coil is surrounded by a cryogen chamber (17) which is located radially outwardly from the coil (3) on the other side of the support (12). The cryogen chamber is in fluid communication with a cryogen recondensing unit (33) whereby vaporized cryogen may flow from the cryogen chamber (17) to the cryogen recondensing unit (33) to be recondensed in use before returning to the cryogen chamber. Thermally conductive means (25) is arranged to facilitate heat transfer from the superconducting coil (3) to the cryogen chamber (17) to vaporize cryogen contained therein in use and thereby remove heat from the coil. The thermally conductive means (25) is highly thermally conductive at cryogenic temperatures. In use, the highly thermally conductive means (25) facilitates transfer of heat from the coil (3) to the interior of the cryogen chamber (17) to vaporize cryogen located therein. A thermal conduction path is therefore used to transfer heat from the coil to the cryogen in the cryogen chamber. Cryogen vaporized in the cryogen chamber then flows to the cryogen recondensing unit (33) to be recondensed before returning to the chamber, while the vaporized cryogen acts as the heat transfer medium over the longer distance between the cryogen chamber and the recondensing unit.

A cryogenic inertial Micro-Electro-Mechanical System (MEMS) device is provided. The device may include a vibratory gyroscope operable to sense a rotational acceleration. The device may also include a pre-amplifier co-located in a close proximity to the vibratory gyroscope. The device may be operated at substantially low temperatures, such as cryogenic temperatures, to reduce electrical noise and improve stability of outputs of the system.

A cryogenic refrigerator (10) which generates a cryogenic temperature by compressing and expanding a working gas in a closed loop (11). The cryogenic refrigerator comprises a bypass line (22) allowing a high-pressure portion and a low-pressure portion to communicate with each other, a gas storage tank (24) located midway in the bypass line and having pressure regulation valves (23a, 23b) on the high-pressure side and the low-pressure side, respectively, and a pressure control unit (26) controlling the pressure regulation valves. The pressure control unit (26) controls the pressure regulation valves (23a, 23b) so that the pressure in the gas storage tank (24) is equal to the pressure in the closed loop at room temperature and in a stopped state and so that the pressure in the gas storage tank (24) is between the pressures in the high-pressure portion and in the low-pressure portion and is close to the pressure in the low-pressure portion in an operating state.

The invention provides an air flue device, which comprises an air flue rear cover plate, an air flue foam piece, an air flue front cover plate and an air quantity adjusting mechanism, wherein the air flue foam piece is matched with the air flue rear cover plate to define an air outlet flue therebetween, an air inlet is formed on the lower part of the air flue foam piece, a first air outlet is formed on the upper part of the air flue foam piece, the upper end of the air flue is closed, and a second air outlet is formed at the lower end of the air flue; the air flue front cover plate is matchedon the outer surface of the air flue foam piece and provided with an air outlet grating and an air inlet grating corresponding to the first air outlet and the air inlet respectively; and at least onepart of the air quantity adjusting mechanism is rotationally arranged in the air flue and positioned between the first air outlet and the second air outlet, and the air quantity adjusting mechanism is used for adjusting the air outlet quantity of the second air outlet. According to the air flue device, the air volume at the air outlet can be controlled more easily, and the cryogenic temperature can be regulated.

The invention discloses a method for preparing a high-strength heat-resistant and cold-resistant modified polypropylene pipe. The pipe is formed by the following steps of: extruding an outer layer, a middle transition layer and an inner wall layer onto the same one mold through three extruders, fusing and compounding. The outer layer of the pipe consists of modified polypropylene, an impact-resistant modifying agent, an antibacterial agent, a light stabilizer, an antioxygen, a compatibilizer, nanometer materials, a tackifier and a color masterbatch in parts by weight; the middle transition layer of the pipe consists of engineering plastics, the modified polypropylene, the compatibilizer, the a tackifier and the color masterbatch in parts by weight; and the inner wall layer of the pipe consists of the engineering plastics, the modified polypropylene, the compatibilizer, a fortifier, a filler, the nanometer materials and the color masterbatch in parts by weight. Compared with traditional similar pipes, the operating temperature of the pipe prepared by the method disclosed by the invention is improved by 30-70 DEG C; the cold-resistant temperature is lowered by minus 15-minus 30 DEG C; the pressure-resistant property is improved by 30-50 percent; the creep resistance is improved by 100-200 percent; the service life is prolonged by 10-20 years; and the wall thickness of the pipe is reduced by 20-50 percent.

An automated storage and retrieval system for storing chemical and biological samples includes freezer chests maintained at an ultra-low temperature (e.g. −80° C.) or a cryogenic temperature. The freezer chests are located within a refrigerated (e.g. −20° C.) enclosure. Samples are loaded through a wall of the enclosure and are then transferred to an input/output buffer section in an ultra-low temperature or cryogenic freezer chest that is thermally segregated from a long-term storage section in the same freezer. Specialized input/output cassettes are used for transferring the samples through an input/output module into the system.

Containers suitable for storing pressurized fluids at cryogenic temperatures of −62° C. (−80° F.) and colder are provided and comprise a self-supporting liner and load-bearing composite overwrap, whereby means are provided for substantially preventing failure of the container during temperature changes.

A process for producing polymer drag reducing agent (DRA) slurries without cryogenic temperatures or conventional grinding is described. The homogenizing or size reduction of polymer, such as poly(alpha-olefins), may be achieved by the use of granulated polymer and at least one liquid, non-solvent for the polymer DRA. In one non-limiting embodiment of the invention, the homogenizing is conducted at ambient temperature. Examples of suitable non-solvents include water and non-aqueous non-solvents including, but not necessarily limited to, alcohols, glycols, glycol ethers, ketones, and esters; having from 2-6 carbon atoms, and combinations thereof. The polymeric DRA may be homogenized to an average particle size of about 600 microns or less.

The present invention provides for a process for purifying carbon monoxide-containing gas streams that contain impurities such as hydrocarbons by using a cryogenic adsorption process. Preferably this process is a temperature swing adsorption process at cryogenic temperatures below −75° C. Alternatively, the carbon monoxide-containing gas streams may be purified using the cryogenic adsorption process with membrane separation units or vacuum swing adsorption units or cryogenic distillation.

A cassette puller for an automated storage and retrieval system that stores biological or chemical samples in freezers maintained at ultra-low temperature (e.g., −80° C.) or cryogenic temperatures includes a vertical sleeve into which the selected cassette is lifted. The cassette puller is mounted to a traveling gantry and transports cassettes from one freezer location to another and to the system input/output module, and also includes an ejection mechanism that inserts and retrieves tube storage racks or plates from a selected shelf on the cassette. Other components such as a rack robot, a tube picking mechanism, a sample identification station, etc. are mounted on the traveling gantry as well.

Cryogenic refrigeration employs a pulse tube cryo-cooler and a dilution refrigerator to provide very low temperature cooling, for example, to cool superconducting processors. Continuous cryogenic cycle refrigeration may be achieved using multiple adsorption pumps. Various improvements may include multiple distinct thermal-linking points, evaporation pots with cooling structures, and/or one or more gas-gap heat switches which may be integral to an adsorption pump. A reservoir volume may provide pressure relief when the system is warmed above cryogenic temperature, reducing the mass of the system. Additional heat exchangers and/or separate paths for condensation and evaporation may be provided. Multi-channel connectors may be used, and/or connectors formed of a regenerative material with a high specific heat capacity at cryogenic temperature. Flexible PCBs may provide thermal links to components that embody temperature gradients. Various components may be pre-cooled, for example via a switchable thermalization system.

A sample cooling apparatus capable of cooling and holding samples or wafers at a cryogenic temperature with no vibration or drift with respect to a measurement reference surface is disclosed. In the sample cooling apparatus, a sample holder is arranged in a vacuum vessel mounted on a housing having a table for forming a measurement reference surface to be supported by a thermal insulator. A frame is disposed within the housing to be supported by a first buffer. A refrigerating machine is disposed in the frame to be supported by a second buffer and has a head directed to the vacuum vessel. The cooling head of the refrigerating machine is connected to the sample holder by way of a flexible thermal conduction member.

A refrigeration system for minimizing the cool down time of a mass to cryogenic temperatures including a compressor, an expander, a gas storage tank, interconnecting gas lines, and a control system. The compressor output is maintained near its maximum capability by maintaining near constant high and low pressures during cool down, gas being added or removed from the storage tank to maintain a near constant high pressure, and the speed of said expander being adjusted to maintain a near constant low pressure, no gas by-passing between high and low pressures.