摘要:
Disclosed are a magnetic sensor chip and a magnetic sensor. The magnetic sensor chip comprises a magnetic sensitive film (2, 21), and in the longitudinal direction of the magnetic sensitive film (2, 21) are provided a number n of suppression units (4) capable of achieving the sectionalized suppression of a demagnetizing field, where the number n is an integer equal to or greater than 2. By means of the suppression units (4) arranged in the longitudinal direction of the magnetic sensitive film (2, 21), the magnetic sensitive film (2, 21) to achieve a suppression of a demagnetizing field, so as to reduce or even eliminate the hysteresis of the magnetic sensitive film (2, 21), thus improving the sensitivity of the magnetic sensor chip.
摘要:
A light fixture includes a ballast and a plurality of lamps connected to the ballast in parallel. The ballast provides an output signal to the plurality of lamps as a function of a 1st steady state condition. When the ballast senses an end-of-life condition for a lamp of the plurality of lamps, the ballast increases the frequency of the output signal provided to the plurality of lamps until the lamp ceases to conduct current. When the lamp ceases to conduct current, the ballast decreases the frequency of the output signal to a frequency determined as a function of a 2nd steady state condition different from the 1st steady state condition. A total current of the 2nd steady state condition is proportional to a total current of the 1st steady state condition as a function of the number of lamps exhibiting an end-of-life condition.
摘要:
A ballast includes a rectifier, DC to DC converter, a dimming sensor, and a light source driver circuit. The rectifier provides rectified power from an AC power source modified by a chopper dimmer. The converter includes a boost inductor having a primary winding and a detection winding. The converter receives the rectified power from the rectifier and provides a DC power rail. The dimming sensor monitors a voltage of the detection winding of the boost inductor and provides a dimming signal as a function of the monitored voltage. The light source driver circuit receives the dimming signal, receives the DC power rail, and provides power from the DC power rail to the light source as a function of the dimming signal. An amount of power provided to the light source by the light source driver circuit corresponds to a dimming level indicated by the dimming signal.
摘要:
A wind turbine blade has a suction side shell member and a pressure side shell member. The shell members are joined along a leading and trailing edge from a root to a tip of the blade and defining an internal cavity of the blade. A pressure sensor is configured on at least one of the suction or pressure side shell members. The pressure sensor further includes a body mounted to an inner surface of the respective shell member within the internal cavity. A sensing element has a first side exposed to external air pressure through a passage in the respective shell member, and an opposite second side exposed to a reference pressure. Control circuitry within the body generates a variable output signal as a function of a pressure differential between the external air pressure and reference pressure experienced by the sensing element.
摘要:
A unitary graphene-based integrated heat sink comprising a heat collection member (base) and at least one heat dissipation member (e.g. fins) integral to the baser, wherein the base is configured to be in thermal contact with a heat source, collects heat therefrom, and dissipates heat through the fins. The unitary graphene material is obtained from heat-treating a graphene oxide gel at a temperature higher than 100° C., 500° C., 1,250° C., or 2,000° C., and contains chemically bonded graphene molecules having inter-graphene distance of 0.3354-0.4 nm (preferably mm or cm), exhibiting a degree of graphitization preferably from 1% to 100% and a Mosaic spread value less than 0.7 (preferably no greater than 0.4). The finned heat sink may also be made from a filler-reinforced graphene matrix composite.
摘要:
Disclosed is an integrated graphene film-enhanced display device, comprising: (a) a display device which comprises one or multiple heat sources and a back surface where a localized area is at a higher temperature than an adjacent area; and (b) a heat spreader which comprises at least one sheet of integrated graphene film having two major surfaces, wherein one of the major surfaces of the heat spreader is in thermal contact with one or multiple heat sources and further wherein the heat spreader itself reduces the temperature difference between locations on the display device. The integrated graphene film, either a graphene film obtained from a graphene oxide gel or a graphene composite film formed of graphene oxide gel-bonded nano graphene platelets (NGPs), exhibits highest thermal conductivity and highest effectiveness in reducing hot spots in various kinds of display devices.
摘要:
Disclosed is a graphene-based heat dissipation system for an electronic device, comprising: (a) an electronic device comprising a heat source, wherein the heat source transmits heat to a second component or an external surface of the electronic device; (b) a heat-conducting layer comprising two major surfaces, the heat-conducting layer being positioned such that one of its major surfaces is in operative contact with the heat source such that it is interposed between the heat source and the second component or the external surface of the electronic device; wherein the heat-conducting layer comprises at least one sheet of integrated graphene film which thermally shields the second component or the external surface of the electronic device from heat generated by the heat source.
摘要:
The present disclosure relates to a carbon nanotube composite film. The carbon nanotube composite film includes a plurality of magnetic particles, a carbon nanotube film structure and a PVDF. The carbon nanotube film structure is a free-standing structure. The carbon nanotube film structure defines a plurality of interspaces. At least a portion of the plurality of magnetic particles and the PVDF is filled in the plurality of interspaces.
摘要:
A method for making a carbon nanotube composite film is provided. A PVDF is dissolved into a first solvent to form a PVDF solution. A carbon nanotube film structure is provided and immersed into the PVDF solution. The carbon nanotube film structure is transferred into a second solvent. The carbon nanotube film structure is transferred from the second solvent and dried. A solubility of first solvent in the second solvent is greater than a solubility of PVDF in the second solvent. A boiling point of the second solvent is lower than a boiling point of first solvent.
摘要:
A method and apparatus for resuming a session between a client device and an IVR system in customer service. The method includes the following steps: reestablishing the session in customer service; determining whether there is status information of an abnormally terminated session corresponding to the reestablished session in customer service; retrieving the status information of the abnormally terminated session in customer service; and resuming the session between the client device and the IVR system in customer service according to the retrieved status information.