38 results about "Permeance" patented technology

A variable reluctance resolver has a rotor which includes a noncircular core and which is rotatably supported inside a stator with a gap therebetween. The shape of the rotor is such that the gap permeance, which is based on the gap, varies according to a sine function of the rotational angle. Each of the salient poles of the rotor has an outer periphery comprising an arc of radius r centered on a point which is offset from the center of the rotor by a prescribed offset distance. The outer periphery of each salient pole does not extend to the inner periphery of the stator.

Disclosed is a multilayer structure comprising a layer of humidity-dependent composition having a ratio of wet cup permeance to dry cup permeance greater than 10 and a layer of crystallizable polymer sufficiently permeable to oxygen, carbon dioxide and water vapor, exhibiting an increase in permeability to at least one of oxygen and carbon dioxide by a factor of at least 2.5 over a temperature range of 10° C. between 0° C. and 40° C. Also disclosed are packaging materials comprising the multilayer structure and methods for storing respiring materials using the packaging materials.

A faced building insulation assembly includes a first facing forming a first major surface of the assembly with a central field portion having one or more spunbond continuous polymeric filament mat layers. Preferably, the facing is fungi growth resistant and has a selected water vapor permeance rating as applied to an insulation layer of the assembly. The facing may also include one or more polymeric film layers, a fungi growth inhibiting agent, a pesticide, and / or a heat activated bonding agent that bonds the facing to the insulation layer of the assembly. The insulation assembly may also include a second facing forming a second major surface of the assembly that has a water vapor permeance rating equal to or differing from the first facing.

The present invention discloses new types of poly(amidoamine) (PAMAM) dendrimer-cross-linked polyimide membranes and methods for making and using these membranes. The membranes are prepared by cross-linking of asymmetric aromatic polyimide membranes using a PAMAM dendrimer as the cross-linking agent. The PAMAM-cross-linked polyimide membranes showed significantly improved selectivities for CO2 / CH4 compared to a comparable uncrosslinked polyimide membrane. For example, PAMAM 0.0 dendrimer-cross-linked asymmetric flat sheet poly(3,3′,4,4′-diphenylsulfone tetracarboxylic dianhydride-3,3′,5,5′-tetramethyl-4,4′-methylene dianiline) (DSDA-TMMDA) polyimide membrane showed CO2 permeance of 135.2 A.U. and CO2 / CH4 selectivity of 20.3. However, the un-cross-linked DSDA-TMMDA asymmetric flat sheet membrane showed much lower CO2 / CH4 selectivity (16.5) and higher CO2 permeance (230.8 GPU).

Sheathing panels are produced by methods which do not require natural resources such as wood and use significantly reduced embodied energy when compared with the energy used to fabricate gypsum sheathing panels. A novel binder, consisting in one embodiment of monopotassium phosphate and magnesium oxide, and combined with various fillers, is incorporated with hollow tubes or water soluble fibers to create a gypsum board-like core which can be formed into a suitable sheathing panel handled and installed in a typical manner. The panel is manufactured to have a desirable shear resistance and water vapor permeability, important performance elements in building envelope design. The manufacturing process results in a panel that does not require mature trees as source material, does not off gas, and involves much lower greenhouse gas emissions than the processes used to make traditional wood or gypsum-based sheathing panels.

An object of the invention is to provide a heating device that is securely held in its worn position, and that can exhibit a sufficient heating effect. A heating device comprising: a heat-generating portion having an exothermic composition enclosed in one or more sections, the exothermic composition generating heat by contact with air; and an elastic band portion; (1) the band portion surrounding all or a portion of the heat-generating portion to keep the heat-generating portion in contact with the body; (2) the band portion being connected to an end of the heat-generating portion; (3) a face of the heat-generating portion that is brought into contact with the band portion having a moisture permeability of 340 to 610 g / m2 per day, as measured according to Method A (Humidity Sensor Method) defined in JIS K7129; and (4) the band portion having an air permeability of 3 s / 300 cc to 61 s / 300 cc, as measured according to JIS P 8117-1998: Paper and board—Determination of air permeance and air resistance: Gurley method.

The present invention relates to a water magnetizer including a permeance member and a cooking recipient. The permeance member consists of two parallel disks spaced apart each other by a plurality of partitions located along the periphery of the disks, such that there is clearance between the two parallel disks. The permeance member is placed into the cooking recipient that is charged with water. Then, the cooling recipient is placed onto an electromagnetic heater. When the electromagnetic heater powers on, inner coils of the electromagnetic heater regularly vibrate at high frequency to change the direction of electric current and then induce a swirled magnetic field in the clearance. The water would be boiled by a lot of heat generated from electron movement in the induced magnetic field.

The invention discloses a temperature measurement method based on trivalent rare earth ferrous oxides as temperature sensing materials, and belongs to the technical field of thermally responsive materials. The trivalent rare earth ferrous oxides are prepared through a pressureless sintering technology by using trivalent rare earth oxides and ferric oxides as the raw materials. Under the excitation of THz waves, the trivalent rare earth ferrous oxides can radiate out narrow band THz waves, and the center frequency of the narrow band THz waves obviously change along with temperature, so the trivalent rare earth ferrous oxides can be used as the temperature sensing materials and applied to temperature measurement. In the temperature measuring process, a circuit does not need to be led in, and the measurement effect can be good at low temperature. The working temperature range of the temperature sensing materials is wider, theoretically, 0K to antiferromagnetic-paramagnetic transition temperature (650-750K) can be achieved, and the working mode can be in a transmission type or a reflection type. In addition, due to the fact that the THz waves have a good permeance property to most of materials except for metal and strong polar materials, the THz waves can be used for measuring the internal temperature of a closed space.

A micro rotor is disclosed and includes a plurality of circular or annular plate-shaped thick film magnets which each include an isotropic magnet with a thickness t1 having an in-plane remanence Mr of 0.95 T or more and a coercivity HcJ of 400 kA / m or more and a non-magnetic material with a thickness t2 adapted to isolate two adjacent isotropic magnets where the ratio of t1 / t2 is eight or more and which are stacked on one another in multiple layers in the rotation axis direction, wherein at least two pole pairs are provided and a mean magnetic path of in-plane direction having a permeance (B / μoH) of five or more achieved by the magnet alone is provided, whereby eddy current is reduced. Also disclosed are a radial gap type brushless DC motor, a PM stepping motor and an electric generator which incorporate the above described micro rotor.

A method of making a membrane permeable to hydrogen gas (H2↑) is disclosed. The membrane is made by forming a palladium layer, depositing a layer of copper on the palladium layer, and galvanically displacing a portion of the copper with palladium. The membrane has improved resistance to poisoning by H2S compared to a palladium membrane. The membrane also has increased permeance of hydrogen gas compared to palladium-copper alloys. The membrane can be annealed at a lower temperature for a shorter amount of time.