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390 results about "Resistive type" patented technology

Convective cushion with positive coefficient of resistance heating mode

A cushion that is heated convectively using a positive temperature coefficient of resistance type resistive heating element that is provided with heat exchanging surfaces, includes a mattress pad, seat or the like with a bottom surface secured around its perimeter to an air permeable top surface, forming a plenum and containing tubular spacer material or other air flow structure therein. The plenum is connected to a power unit housing a blower, a heating module and a controller unit. The heating module includes a PTC type heating element in conduction with a base plate and a number of heat exchanger fins. Preferably the heating element is sandwiched between a pair of the base plates and the heat exchanger fins, and there is a seal between the base plates to minimize air flow from the blower from passing there between. A remote control for the user's convenience may be provided, and a foldable antenna attachable to the convective unit facilitates wireless communication between the remote control and controller unit. The user resting atop the cushion is able to control the blower and heating module to deliver air of a desired temperature and quantity to the cushion and through the top surface. The invention advantageously replaces the current carrying, conductive wires and insulation found inside prior art heated mattresses, enhancing safety and performance while at the same time offering a cooled or ventilated capability.
Owner:FEHER STEVE

Heat preventing and insulating stealth compound material with broad-band wave absorption and preparation method thereof

ActiveCN107555940AMeet the needs of impedance matchingRealize broadband absorbing functionLamination ancillary operationsLaminationWeight gainingControllability
The invention discloses a heat preventing and insulating stealth compound material with broad-band wave absorption and a preparation method thereof. The compound material comprises a cold-faced panel,a first aerogel compound material heat-insulating layer, a first resistance high-temperature super-material layer, a second aerogel compound material heat-insulating layer, a second resistance high-temperature super-material layer, a third aerogel compound material heat-insulating layer and a hot-faced panel from inside to outside sequentially. In the aspect of heat preventing and insulating performance, compared with existing heat insulating tiles and cover plate type heat prevention systems, the integrated heat preventing and insulating stealth compound material has the advantages of good heat insulating performance, excellent mechanical performance, large component preparation availability, high reliability, easiness in maintenance and the like; and in the aspect of stealth performance, the technical scheme adopting the high temperature super-material has the advantages of strong designability and easiness in broad-band wave absorption implementation, weight gain is hardly generated in comparison with the technical scheme of a cold-faced by adopting a wave absorbing material, absorbent is not required to be added into a heat preventing and insulating material, the heat preventing and insulating performance is not influenced, and the material has good uniformity and strong controllability.
Owner:NAT UNIV OF DEFENSE TECH

High temperature resistant radar and infrared compatible stealth material based on double-layer metamaterials and preparation method of stealth material

ActiveCN106427115ALow emissivity characteristicEasy to implement reflection functionLaminationLamination apparatusFiberLow emissivity
The invention discloses a high temperature resistant radar and infrared compatible stealth material based on double-layer metamaterials. The high temperature resistant radar and infrared compatible stealth material is of a layered structure sequentially comprises a dielectric layer I, a resistance-type high temperature metamaterials layer, a dielectric layer II, a decorative layer and a frequency selective surface layer from inside to outside, wherein both the dielectric layer I and the dielectric layer II are made of oxide fiber reinforced oxide-based composite materials, the resistance-type high temperature metamaterials layer mainly comprises a high temperature resistant resistor coating with periodic patterns, the decorative layer is made of glass coatings, and the frequency selective surface layer mainly comprises a high temperature resistant antioxidant and low infrared emissivity precious metal plating layer with periodic patterns. A preparation method is characterized in that the materials of the layers are prepared in a layered manner. The high temperature resistant radar and infrared compatible stealth material has high designability, the problem of radar and infrared compatible stealth contradiction can be effectively solved from the perspective of structural design by the aid of metamaterial technology, and the high temperature resistant radar and infrared compatible stealth material has good broadband wave-absorbing performance and low emissivity and can resist high temperature of 1000 DEG C or more.
Owner:NAT UNIV OF DEFENSE TECH +1
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