70 results about "Thermal decay" patented technology

Cumulative thermal exposures monitors and remote indicating cumulative thermal exposure monitors and system for reading the same are disclosed. The monitors have a thermally insulative housing with a cavity and a thermally-responsive member therein formed of shape memory material, which may be provided with a coating or sheath of insulative or shape memory polymer material, that gradually changes from a first shape to a second shape over a prescribed temperature range wherein the thermal capacity and insulative properties of the housing, cavity, and shape memory material transition temperature range are correlated relative to one another and calibrated to closely match a thermal decay profile (time-temperature profile) of the product being monitored. In remote indicating embodiments, the data can be retrieved remotely via RF transponder technology without directly viewing the monitor device.

A perpendicular magnetic recording medium for thermo-magnetic printing has an ultra-high recording density and is resistant to thermal decay of magnetization. An intermediate layer of the medium is provided between a first recording layer using a low-noise Co alloy ferromagnetic substance and a second recording layer using a ferrimagnetic substance (e.g., a rare-earth element-transition metal compound) having a compensation temperature below an operation ambient temperature. A magnetic field is applied thereto to form a magnetization pattern on the first recording layer. It is then heated-up to be printed onto the second recording layer, which has a higher coercivity at the ambient temperature, and a recording field is suitably set to form a magnetization pattern only on the first recording layer. The magnetization pattern is printed from the first recording layer to the second recording layer.

A system and method is presented for a fail-safe sensor for an HVAC system. The sensor comprises a temperature detector operable to measure a temperature of a component or a medium present at the sensor, a PTC heater operable to heat the sensor to a self-regulating temperature, the heater comprising a resistive element having an electrical impedance which increases with increasing temperature in accordance with a positive temperature coefficient characteristic, and a sensor housing comprising the PTC heater and the temperature detector provided within a single housing. An algorithm is provided for HVAC systems, wherein the sensor is heated to the self-regulating temperature by the PTC heater and is then measured by the temperature detector to confirm that the temperature detector is operating properly. Further, the sensor may be allowed to cool to a temperature of the surrounding medium or the component for sensing the temperature thereof. Thereafter, by calculating the time constant of the thermal decay rate of the sensor, the presence or absence of the component or medium surrounding the sensor may be determined in a fail-safe manner by an analyzer, for example.

The invention provides a ceramic/metal composite material brake lining for a high-speed train and a preparation method of the ceramic/metal composite material brake lining, and belongs to the technical field of high-speed brake. The existing high-speed train brake lining has the defects that the thermal stability is poor, the friction factor is low, the abrasion rate is high, the thermal decay resistance is poor, and the service life is short. The ceramic/metal composite material brake lining comprises friction blocks, a base plate and a heat radiation fin, wherein the friction blocks are made of ceramic block reinforced metal composite materials, the gap width among the friction blocks is 3 to 8mm, the ceramic block is obtained through sintering ceramic posts of a certain rule and connected ceramic biscuits of ceramic substrates connected with the ceramic posts, and the connected ceramic biscuits can be formed in modes of slurry filling, gel mold filling, molding pressing, isostatic pressing and the like. The preparation method provided by the invention comprises the following steps including ceramic block sintering, surface treatment, brake lining casting, precise processing and heat treatment. The ceramic/metal composite material brake lining has the characteristics that the thermal stability is good, the friction factor is high, the abrasion rate is low, the thermal decay resistance is good, the service life is long, and the like, and the effective braking can be realized on 380km/h high-speed trains.

A vehicle-mounted information processing apparatus such as a car-navigation system detects that a key switch of the vehicle has been set up at a Lock position (i.e., the engine is stopped). After that, the apparatus performs data reproduction of data files in an order from the oldest, then re-recording the reproduced data files with no change added thereto. Here, the above-described data files, which are stored within a magnetic disk device built in the apparatus, have been not updated for a constant time-period. This re-recording prevents a data loss caused by a thermal decay in the case where the magnetic disk device is mounted inside the vehicle that is likely to have existed under a high-temperature environment for a long time-period.

A copper-free friction material composition for brake pads consists of the following components by weight parts: 0.43 parts of aramid fiber, 1.9 parts of tyre powder, 6 parts of heavy magnesia, 2.55 parts of calcined petroleum coke, 8 parts of ceramic fiber, 6.5 parts of phenolic resin, 14 parts of aluminium silicate fiber, 22 parts of potassium hexatitanate crystal whisker, 25 parts of barite powder, 5 parts of granular graphite, 2 parts of antimony sulfide, 2.8 parts of friction powder of cashew nut oil, 0.9 part of boron nitride, 5 parts of flake aluminum powder, and 0.6 parts of tantalum carbide. The friction material of the present invention is environment-friendly material and contains little heavy metals; hence the friction material is highly environment friendly. And trials show that it has satisfactory high temperature and thermal decay resistant performance, long service life, good abrasion resistance and stable friction coefficient. With the friction material of the present invention used, the brake pad of vehicles is sensitive and stable during braking, produces no screech, is comfortable and has no damage on coupling plate.

The invention discloses a variable-speed transmission mechanism for relay transmission of variable-diameter gears. The variable-speed transmission mechanism comprises two variable-diameter relay transmission gears, variable-diameter adjusting mechanisms, a power input shaft and a power output shaft, wherein the two variable-diameter relay transmission gears are connected with each other through a transmission gear group; the variable-diameter adjusting mechanisms are respectively arranged on the two variable-diameter relay transmission gears; the power input shaft is connected with one variable-diameter adjusting mechanism, and the power output shaft is connected with the other variable-diameter adjusting mechanism. Based on the basic principle of infinitely variable speed, through unique and novel design concept, variable transmission ratio of a main driven wheel is realized by utilizing a clack body combined type variable-diameter wheel body, effective variable-diameter control is realized through the variable-diameter adjusting mechanisms, and power transmission is realized through engagement of gear belts and gears; the variable-speed transmission mechanism is simpler in structure, superior in weight volume and lower in production and manufacturing costs; moreover, the variable-speed transmission mechanism is firmer in structure, the bearing load and torque transmission capacity are greatly improved, and the problems in the prior art that thermal decay exists and larger torques cannot be transmitted through friction transmission speed are solved, so that the variable-speed transmission mechanism can be widely applied to large-displacement automobiles.

Disclosed herein are a magnetic recording medium having a high coercive force and being capable of high-density writing/reading, a magnetic recording apparatus equipped with said magnetic recording medium, and a process for producing said magnetic recording medium. The magnetic recording medium is composed of a substrate, a soft magnetic layer, a non-magnetic intermediate layer, a magnetic layer, a protective layer, and a lubricating layer. The magnetic layer is characterized by the product of the stacking fault density and the dispersion of particle diameters which is no larger than 0.02. The stacking fault density should preferably be no larger than 0.05, and the dispersion of particle diameters should preferably be no larger than 0.4. The magnetic recording medium has a coercive force larger than 4000 Oe, is highly stable to thermal decay, and has a recording density in excess of 50 Gbit/in2.

The thermal decay of data written to a magnetic mass storage medium is determined by measuring and analyzing the time-domain equalized-signal-to-noise ratio (ESNR) and equalized signal-to-total-distortion noise ratio (ESTDR) of written data. In some embodiments, a test track and a reference track are initialized from data. Subsequently, the reference track is re-initialized from the test data, and the time-domain ESNR and/or ESTDR measurements are made of the test track and the reference track, at predetermined time intervals. Later, the time-domain ESNR and ESTDR measurements are analyzed to determine the thermal decay of the data written. In another embodiment of the present invention, the ESNR and/or ESTDR measurements includes reading the data through a non-return-to-zero bus in phases, in which the phases are selected in sequence.

The invention discloses a ceramic based friction material and a preparation method thereof. The ceramic based friction material has improved mechanical properties, fracture mechanical properties, thermal shock stability, stable chemical properties, excellent friction performance and wide field of use, and is composed of the following raw materials: an inorganic macromolecular polymeric binder, a reinforcing material, a friction performance conditioning agent and other materials. With the advantages of high temperature resistance, high pressure resistance and impact resistance, good anti-thermal decay performance, unique function, environmental protection and energy saving, light weight, no harm to a dual equivalent, long service life and strong environmental adaptability, the high performance friction material has a service life increased by over 2 times than that of existing products.

A method of manufacturing a magnetic recording medium comprises sequential steps of:

• • (a) providing an apparatus for manufacturing the medium;
  • (b) supplying the apparatus with a substrate for the medium;
  • (c) forming a magnetic recording layer on the substrate in a first portion of the apparatus;
  • (d) treating the magnetic recording layer with oxygen gas in a second portion of the apparatus at a sub-atmospheric pressure and for an interval sufficient to provide the resultant medium with at least one of the following, relative to a similar medium manufactured by a similar method but wherein the oxygen treatment of step (d) is not performed:
    • (i) a more negative nucleation field (H_n);
    • (ii) increased remanent squareness (S_r);
    • (iii) increased signal-to-medium noise ratio (SMNR);
    • (iv) narrower switching field distribution (SFD); and
    • (v) decreased thermal decay rate; and
  • (e) forming a protective overcoat layer on the oxygen-treated magnetic recording layer in a third portion of the apparatus.

A method and apparatus for providing an early warning of thermal decay in magnetic storage media are provided. In accordance with an embodiment of the present invention, a test pattern that is particularly susceptible to thermal decay is written to a disk. The test pattern is then read, and the amplitude of the signal produced by the test pattern is stored. When testing for thermal decay is desired, the test pattern is again read, and the amplitude of the signal produced in the channel is compared to the stored amplitude. If the later amplitude is less than the stored amplitude by at least a predetermined amount, a thermal decay warning signal is generated. In accordance with another embodiment of the present invention, a test pattern is written to a portion of a disk that has been identified as being particularly susceptible to thermal decay. The amplitude produced by the test pattern is then stored so that it can later be compared to an observed amplitude when testing for thermal decay. The present invention allows remedial measures to ensure the integrity of data to be taken before data loss due to thermal decay can occur.

The invention relates to an airplane braking field, when braking, the brake feet falls on the X-axis on the ground and rubs against the ground, so as to generate ground braking force, and eliminating deflection moment, thus eliminating the phenomena of deviating, sdieslipping and tailing. The wheels are in a driven state, keeping guiding and making the airplane have good directional stability. The descending height of the brake feet is controlled by load sensing pressure limiting valve to keep balancing the airplane. It radically eliminates the deflection moment caused by unequal two-side braking forces. In addition, the wheels is in a driven rolling state and still has guiding force and adhesive force, to make the airplane have good directional stability, able to prevent sideslipping and tailing, enhancing braking efficacy of the airplane, shortening braking distance and reducing tyre wear. It can also enhance thermal decay resistance, simplifies original braking system and has extremely high social and economic benefits.

The invention discloses a preparation method of a friction material of a yaw brake pad, belonging to the technical field of brake systems. The preparation method comprises the steps of grinding raw materials, wherein the raw materials include the following components in percentage by weight: 30-40% of iron powder, 10-15% of flake graphite, 8-12% of potash feldspar, 8-15% of red copper fiber, 8-13% of steel wool fiber, 8-12% of organosilicone modified phenolic resin, 5-10% of potassium titanate, 2-5% of antimony sulfide and 0.2-1% of vanadium oxide; mixing all the raw materials; carrying out hot press molding; carrying out vacuum hardening treatment; binding. The friction material prepared by using the method is stable in friction coefficient, high in thermal decay stability, strong in water resistance and wear resistance, little in damage to counterparts during braking, particularly suitable for braking middle-large machines, good in braking effect, long in service life, capable of being formed through one-step high-temperature hot pressing, high in degree of mechanization, simplified in production process and high in rate of finished products.

The invention provides a micro-liquid cooling device and method for automobile brake thermal decay. Braking is unlikely to fail, the temperature is reduced stably, and energy consumption is low. The cooling device comprises a high-pressure gas connecting pipe, a gas circuit switching valve, a tee joint, a nozzle, a water way switching valve, a water pump, a water tank, a controller and a temperature measurement element. The gas circuit switching valve is arranged on the high-pressure gas connecting pipe, the output end of the high-pressure gas connecting pipe communicates with one end of the tee joint, the second end of the tee joint communicates with the nozzle, the third end of the tee joint communicates with the water pump through the water way switching valve, and the water pump communicates with the water tank. Both the gas circuit switching valve and the water way switching valve are connected with the controller, the temperature measurement element is used for acquiring a temperature signal of a brake and sending the temperature signal to the controller, and the controller controls the on-off states of the gas circuit switching valve and the water way switching valve according to the received temperature signal. Firstly, the temperature critical threshold value of the brake is calculated, and when the acquired temperature signal reaches the temperature critical thresholdvalue, the cooling device is started to cool the brake.

The invention relates to an organic friction material containing no copper or asbestos. The material comprises the following components including, by weight, 10-15 parts of a binding material, 45-55 parts of non-copper packing, 3-5 parts of an acid-base adjusting material, 5-10 parts of organic fiber, 8-13 parts of inorganic fiber, 6-15 parts of non-copper metal fiber or non-copper metal powder and 0.5-10 parts of a reinforced material. According to the organic friction material provided by the invention, the reinforced material is added on the basis of the binding material, the organic fiber and the inorganic fiber, it is guaranteed that the friction coefficient of the friction material is stable, the braking stability is better than that in the prior art particularly under low-temperature and high-temperature working conditions, the friction material is stable and comfortable, and meanwhile, the organic friction material is resistant to thermal decay and long in service life.