277 results about "Curie" patented technology

Method, system and apparatus for monitoring target tissue temperatures wherein temperature sensors are configured as passive resonant circuits each with a unique resonating signature at monitoring temperatures extending below a select temperature setpoint. The resonant circuits are configured with an inductor component formed of windings about a ferrite core having a Curie temperature characteristic corresponding with a desired temperature setpoint. By selecting inductor winding turns and capacitance values, unique resonant center frequencies are detectable. Temperature monitoring can be carried out with implants at lower threshold and upper limit temperature responses. Additionally, the lower threshold sensors may be combined with auto-regulated heater implants having Curie transitions at upper temperature limits.

Ovenware for microwave ovens which contain a composition comprising a susceptor which has a Curie point temperature of about 100° C. to about 300° C. and a thermoplastic or thermoset polymer are improved and said composition is in contact with the food or drink to be heated or cooked, and / or composition has a thermal conductivity of about 0.7 W / m° K. or more. Heat generated by absorption of microwave radiation by the susceptor is more readily conducted to the food being cooked when the thermal conductivity of the composition is high, particularly when the part containing the susceptor is relatively thick. The relatively low Curie point of the susceptor prevent overheating of the ovenware and food being cooked. Also described are designs for various pieces of ovenware containing this composition.

An apparatus for synthesizing nanostructures. In one embodiment, the apparatus includes a heating device that defines a reaction zone therein and a susceptor made of a ferromagnetic material with a Curie temperature and placed in the reaction zone, where the Curie temperature substantially corresponds to a temperature at which the growth of desired nanostructures occurs and the heating device is capable of heating the susceptor substantially at the Curie temperature.

A high power high yield target for the positron emission tomography applications is introduced. For production of Curie level of Fluorine-18 isotope from a beam of proton it uses about one tenth of Oxygen-18 water compared to a conventional water target. The target is also configured to be used for production of all other radioisotopes that are used for positron emission tomography. When the target functions as a water target the material sample being oxygen-18 or oxygen-16 water is heated to steam prior to irradiation using heating elements that are housed in the target body. The material sample is kept in steam phase during the irradiation and cooled to liquid phase after irradiation. To keep the material sample in steam phase a microprocessor monitoring the target temperature manipulates the flow of coolant in the cooling section that is attached to the target and the status of the heaters and air blowers mounted adjacent to the target. When the target functions as a gas target the generated heat from the beam is removed from the target by air blowers and the cooling section. The rupture point of the target window is increased by a factor of two or higher by one thin wire or two parallel thin wires welded at the end of a small hollow tube which is held against the target window. One or two coils are used to produce a magnetic filed along the beam path for preventing the density depression along the beam path and suppression of other instabilities that can develop in a high power target.

Method, system and apparatus for monitoring target tissue temperatures wherein temperature sensors are configured as passive resonant circuits each with a unique resonating signature at monitoring temperatures extending below a select temperature setpoint. The resonant circuits are configured with an inductor component formed of windings about a ferrite core having a Curie temperature characteristic corresponding with a desired temperature setpoint. By selecting inductor winding turns and capacitance values, unique resonant center frequencies are detectable. Temperature monitoring can be carried out with implants at lower threshold and upper limit temperature responses. Additionally, the lower threshold sensors may be combined with auto-regulated heater implants having Curie transitions at upper temperature limits.

A system and method inductively heats and stress relieves a weld joint area having a stress induced zone. A susceptor assembly is positioned over the stress induced zone. The susceptor assembly includes susceptor sheets manufactured to operate at different, preselected Curie temperatures. A housing is mounted over the susceptor assembly including an induction coil positioned adjacent to the susceptor assembly. An alternating electric current is applied to the induction coil. The alternating electric current causes the induction coil to generate a plurality of magnetic flux lines. The invention provides the advantage that the magnetic flux lines passing through the susceptor assembly heat the susceptor assembly providing localized and controlled temperature heat to the weld joint area to stress relieve the stress induced zone.

In the continuous annealing of a steel strip with Curie point (Tc) at an annealing temperature exceeding Tc with the use of a continuous annealing equipment composed of a heating area, a soaking areaand a cooling area, the heating treatment in the heating area is divided into three regions. In the first heating area, the steel strip is heated to below Tc-50 DEG C by radiant heating means by gas heating and / or radiant heating means by an electric heater. In the subsequent second heating area, the heated steel strip is heated to the region of Tc-30 DEG C to Tc-5 DEG C by solenoid coil high-frequency induction heating means. In the final third heating area, the heated steel strip is heated to a treatment target temperature exceeding Tc by radiant heating means by gas heating and / or radiant heating means by an electric heater. Accordingly, there can be attained uniform annealing in the longitudinal direction of the steel strip with Curie point.

A preparation method of a lead-free high-Curie temperature PTC varistor ceramic material, the Na2Co3, Bi2O3 and TiO2 are mixed into a compound A while the TiO2 and BaCO3 are mixed into a compound B, the Na0.5Bi0.5TiO3 powder and the BaTiO3 powder are synthesized respectively through ball milling of the compound A and B; the synthesis Na0.5Bi0.5TiO3 powder and BaTiO3 powder, the semi-derived element and the TiO2 are ball milled, dried, granulated, and molded; the body molded is sintered to obtain a semi-derived ceramic sample which is oxidized for the lead-free high-curie temperature PTC varistor ceramic material. The invention fulfills unleaded requirements, avoids environmental pollution and human harm caused by lead application in manufacturing of resistance material, and solves the technical difficulties for the semi-derived lead-free high-curie temperature PTC varistor ceramic material.

A lead-oxide-free piezoelectric ceramic composition having an electromechanical coupling coefficient greater than a predetermined value and having a Curie point of at least 500.degree. C., whose main component is a two-component-based solid solution of the formula of (1-x)Bi.sub.a Ti.sub.b Nb.sub.c O.sub.9 -xNa.sub.p Bi.sub.q Nb.sub.r O.sub.9, and which has a bismuth layer structure in the range of 0<x<1, the solid solution of the above formula satisfying 2.4<(1-x)a+xq<3.1, 0<b<1.1, 0.9<(1-x)c+xr<2.1, and 0<p<0.6.

Method, system and apparatus for monitoring target tissue temperatures wherein temperature sensors are configured as passive resonant circuits each with a unique resonating signature at monitoring temperatures extending below a select temperature setpoint. The resonant circuits are configured with an inductor component formed of windings about a ferrite core having a Curie temperature characteristic corresponding with a desired temperature setpoint. By selecting inductor winding turns and capacitance values, unique resonant center frequencies are detectable. Temperature monitoring can be carried out with implants at lower threshold and upper limit temperature responses. Additionally, the lower threshold sensors may be combined with auto-regulated heater implants having Curie transitions at upper temperature limits.

It is intended to provide a semiconductor ceramic composition containing no Pb, which is capable of shifting the Curie temperate to a positive direction as well as of controlling room temperature resistivity and having an excellent jump characteristic. Since the semiconductor ceramic composition in which a portion of Ba of BaTiO3 is substituted by Bi—Na has a crystal in which a central part and an outer shell part of a crystal grain are different from each other in composition, the composition is capable of improving control of room temperature resistivity and a jump characteristic, and therefore it is optimum as a material for a PTC thermistor, a PTC heater, a PTC switch, a temperature detector, and the like.

The invention discloses a preparation method of nanoparticles for self-controlled temperature magnetic-induction hyperthermia, and belongs to the technical field of magnetic-induction hyperthermia for treating tumors. In a spinel cobalt ferrtte structure, sublattices are divided into tetrahedral sites and octahedral sites, and all Co2+ and one half of Fe3+ are on octahedral sites while the other half of Fe3+ is on the tetrahedral sites; the level of a Curie point is directly determined by the strength of an exchange interaction between the tetrahedral sites and the octahedral sites. According to the method, Cr3+ and Zn2+ are doped into cobalt ferrtte by virtue of a hydrothermal method, so that the number of magnetic ions on the tetrahedral sites and the octahedral sites in the spinel structure is reduced, and subsequently the exchange interaction is weakened; therefore, the Curie point is lowered. By virtue of the spinel structure, the stable chemical properties of the obtained product are guaranteed, and the product, due to the property of low Curie point, is applicable to the self-controlled temperature magnetic-induction hyperthermia. The preparation method is economic and convenient and is easy for popularization.