92 results about "Rate of rise" patented technology

A method for reducing acoustic noise produced during use of a lamp dimmer detects whether the dimmer is a leading edge (101) or a trailing edge dimmer (102). A nominal firing time of a leading edge dimmer is determined and a post-correction applied to a voltage applied to the dimmer starting from the nominal firing time so as to build-up the voltage gradually during a predetermined post-correction time period and thereby reduce the rate of rise of the leading edge thereof. A nominal cutoff time of a trailing edge dimmer is determined and a pre-correction applied to a voltage applied to the dimmer starting from the nominal cut-off time so as to diminish the voltage gradually during a predetermined pre-correction time period and thereby reduce the rate of rise of the leading edge thereof. Other methods are disclosed for soft starting filament lamps and controlling dimmer circuits.

A method and apparatus that solve the problem of accurate measurement of gas flow so that the delivery of gases in semiconductor processing may be performed with greater confidence and accuracy by performing real-time characterization of a lead-line for mass flow controller (MFC) flow verification are provided. In one embodiment a mass flow verifier (MFV) provides rate of rise information to a controller via a digital interface without correcting for lead-line influences. After receiving the rate of rise data from the tool host computer computes a gas mass correction factor in real-time based on at least one of the following: MFC temperature sensor data, lead-line temperature sensor data, lead-line pressure transducer data, and lead-line volume. The rate of rise data and gas mass correction factor are used to compute accurate mass flow. The accurate mass flow information may be used to calibrate the MFC.

A dimmer circuit arrangement is disclosed including a second control circuit for controlling the operation of a triac for delivering current to a load, and a first control circuit for controlling the operation of an IGBT power semiconductor switch for controlling the rate of rise of load voltage. The first control circuit also controls the operation of the second control circuit.

The invention discloses a determination method for an abnormal SQL (structured query language) statement and a server. The determination method comprises the following steps: obtaining total execution time and total execution frequency of each first service SQL statement in a current collecting period, taking the first service SQL statement corresponding to the total execution time before a first set number as a second service SQL statement; obtaining the total execution time and the total execution frequency of each second service SQL statement in a selected collecting period; calculating the rate of rise of the average execution time corresponding to the second service SQL statement; judging whether the rate of rise of the average execution time of each second service SQL statement is greater than a first set threshold value or not respectively, judging that the second service SQL statement with the rate of rise of the average execution time greater than the first set threshold value is the abnormal SQL statement. The normal operation of the system and good user experience are ensured by the technical scheme.

A MOS type semiconductor device wherein on voltage is low, the rate of rise of current at turn-on time is low, and it is possible to hold down the rate of rise of collector current at turn-on time, and reduce radiation noise. The device includes a stripe-shaped plan-view pattern of protruding semiconductor region on an n-type substrate and having a p-type region sandwiched between an upper side n-type first region and a lower side n-type second region, a top flat portion including a depression region with a depth reaching the p-type region, and an inclined portion between the top flat portion and a bottom flat portion around the protruding semiconductor region; and a gate electrode with one end portion of the gate electrode on a surface within the inclined portion, and another end portion on a surface of the lower side n-type second region in the p-type region side vicinity.

The invention is suitable for the field of power supplies and provides a switching power supply and an overvoltage protection circuit thereof. The switching power supply comprises a power conversion unit and a switching power supply overvoltage protection circuit. The switching power supply overvoltage protection circuit comprises a power conversion control unit and an overvoltage protection unit. The overvoltage protection unit comprises a voltage detection and power supply management module, a feedback module, a power supply switch module and a time-delay clamping module. In the embodiment of the invention, when the output voltage of the power conversion unit of the switching power supply sharply rises to a value exceeding an overvoltage point, the voltage detection and the power supply management module feeds the output voltage back to the control end of the power conversion control unit, the time-delay clamping module reduces the rate of rise of the output voltage at the control end, the power conversion unit reduces the rate of rise of the output voltage of the power conversion unit, the voltage detection and power supply management module can conduct overvoltage protection in time even through time delay exists and therefore the switching power supply or a load can be prevented from being burned out.

The invention discloses a servo control system for simulating air pressure of an aircraft. The servo control system comprises a positive pressure source, a negative pressure source, and a pressure sensor, a controller and servo valves that are connected in sequence. The servo valves comprise a first servo valve and a second servo valve. The first servo valve and the second servo valve are used for enabling the positive pressure source and the negative pressure source to be communicated with an air pressure stimulation chamber so that the simulated air pressure P of the air pressure stimulation chamber is changed. The pressure sensor is used for detecting the simulated air pressure P and sending the air pressure to the controller. The controller is used for controlling the opening degree of the servo valves according to instruction signals I. In this way, the rate of rises of drops of the simulated air pressure P is changed. Multiple control valves are adopted to replace a single control valve to conduct associated adjusting of air inflation and air exhaust, differences of a controlled accommodation chamber during an air inflation and exhaust thermodynamic process are made up, pressure control is prevented from being affected due to malfunctioning of the valves, and the pressure change of the controlled accommodation chamber is made to be more steady.

A loudspeaker system suitable for a confined space includes an electro-acoustic transducer and an enclosure for the electro-acoustic transducer. The enclosure combines a second order topology to produce a rising acoustic response (40) for the system at a second order rate and a helmholtz resonator adapted to modify the rate of rise of the response relative to the second order rate such that the response is attenuated relative to the second order rate but is accentuated relative to a flat response, within a substantial part of a passband of the system at least at a selected frequency or frequencies. The system has means included in an electrical path driving the electro-acoustic transducer for equalizing the rising response to provide extended dynamic headroom at least at the selected frequency or frequencies.

The invention discloses a device for limiting a peak value and the rate of rise of transient recovery voltage of a circuit breaker, which not only can limit the rate of rise of the transient recovery voltage of the circuit breaker, but also can limit the peak value of the transient recovery voltage of the circuit breaker. In the device of the invention, the two ends of the circuit breaker are connected in parallel with a capacitor and a lightning protector so as to limit the transient recovery voltage of the circuit breaker; the capacitor is connected in parallel so as to limit the rate of rise of the transient recovery voltage of the circuit breaker; and the lightning protector is connected in parallel to the two ends of the circuit breaker can limit the peak value of the transient recovery voltage of the circuit breaker.

The invention relates to a ceramic-matrix composite material as well as a preparation method thereof, in particular to a titanium zirconium carbide particle reinforced silica-alumina titanium zirconium carbide matrix composite material and a preparation method thereof. A zirconium titanium carbide particle reinforced silica-alumina titanium zirconium carbide solid solution adopting the in-situ synthesis has a zirconium titanium carbide particle reinforced phase with the volume percentage of 5 to 30 percent; and the preparation method comprises: firstly, taking a titanium powder, a zirconium powder, a silicon powder, an aluminum powder and a graphite powder as raw materials, mixing the materials by a physical mechanical method for 10 to 25 hours, putting the materials in a graphite mould for cold briquetting, with the exerted pressure of 5 to 20MPa, and sintering the materials in a hot pressing furnace input with a protective atmosphere, with a rate of rise of temperature of 5 to 50DEG C/min, a sintering temperature of between 1400 and 1650 DEG C, the sintering time of 0.5 to 2 hours, and a sintering pressure of 20 to 40MPa. The composite material and the method can prepare the titanium zirconium carbide particle reinforced silica-alumina titanium zirconium carbide matrix composite material with excellent combination properties such as high purity, high density, high hardness, high toughness and high-temperature mechanical property under rather low temperature and in a short period of time.

A method for reverse reaction sintered Si3N4/SiC composite belongs to the inorganic nonmetals science and engineering techniques field. The ingredients is that: Si3N4 and SiC serves as raw material, one to three of the Al, Si, SiO2 serve(s) as additive, and resin serves as anchoring agent, wherein the weight percentage of the ingredients is that 5~35% of Si3N4, 0~10% of additive, 0.5~9.5% of anchoring agent, and the balance is SiC. The mixture of the ingredients is adequately mixed in an agitator and then is formed the blank with a pressing density of 2.00~2.80 g/cm<3>. The obtained blank is dried and sintered in a kiln at 600~1500 DEG C with a rate of rise of 10~60 DEG C per hour, and the burnt temperature is 1350~1500 DEG C with thermal insulation for 1~12 hours. The present invention has the advantages of that the Si3N4/SiC composite has higher performance, the equipment is simple; besides, the technology is safe and reliable, is convenient to be controlled and is adapted to mass production.

A method for prediction of groundwater level fluctuation. This approach involves using groundwater observations for the determination of rate of decline due to infiltration and rate of rise dues to precipitation for the groundwater level at a site, followed by use of those rates with historic precipitation records to estimate the extent of historic saturation and inundation periods at the site. This information can then be used as an objective criterion for the delineation of jurisdictional wetlands and other similar applications.

The invention discloses a double-side efficient winding machine, relates to textile equipment and aims to solve the problem that a movable frame is low in utilizing rate. According to the technical scheme of the double-side efficient winding machine, the double-side efficient winding machine is characterized by comprising a rack, raw yarn shafts, winding pipe inserting bases and a movable frame; the rack is provided with two raw yarn bearing plates, and the plurality of raw yarn shafts rotate on the two raw yarn bearing plates; the rack is provided with two winding bearing beams; the pluralityof winding pipe inserting bases vertically rotate on the two winding bearing beams; the rack is provided with a driving device used for driving the winding pipe inserting bases; the rack is providedwith two vertical guide rails; the two ends of the movable frame are connected with the two vertical guide rails in a sliding manner; the movable frame is provided with a plurality of extending arms which are provided with yarn guiding sleeves; and the rack is provided with a control device. The double-side efficient winding machine makes the two sides of the movable frame perform winding at the same time, the utilizing rate of rising and falling of the movable frame is effectively increased, and the technical effect that the winding efficiency is doubled is achieved compared with the quoted file.

An engine starting apparatus is equipped with a starter which, when it is required to start an engine, moves a pinion to establish engagement with a ring gear coupled to the engine and energizes an electric motor to produce and transmit torque to the ring gear through the pinion for cranking the engine. When the rate of decrease in current flowing in the electric motor or the rate of rise in voltage appearing at a terminal of the starter or a power supply for the electric motor exceeds a given value after the engine starts being cranked, the engine starting apparatus works as a firing-up determiner to determine that the engine has been fully fired up.