70results about How to "Reduce the steepness" patented technology

A piezoelectric thin-film filter reduces insertion loss and deterioration of steepness of a shoulder characteristic and reduces the ripple in the passband. In a first vibration portion, a piezoelectric thin film is disposed between a pair of electrodes along one main surface of a substrate. In a second vibration portion, the piezoelectric thin film is disposed between a pair of electrodes along the one main surface of the substrate. The vibration portions are both acoustically isolated from the substrate. In the first resonator, an additional film is disposed outside the electrode constituting half or more the overall length of the perimeter of the first vibration portion that is in contact with the electrode when seen from a thickness direction. In the second resonator, the external shape of the vibration portion when seen from a thickness direction is a polygon, and each side of the polygon is not parallel with any of the other sides thereof.

In a cellular wide-area radio communications system, comprising a plurality of base stations; a plurality of relay stations; and a plurality of mobile stations; wherein each of the relay stations is associated with at least one of the base stations, each of the mobile stations is associated with at least one of the base stations or one of the relay stations, wireless data transmissions between mobile stations and base stations take place either as single-hop data transmissions between the mobile stations and their associated base stations, or as multi-hop data transmissions between the mobile stations and their associated relay stations and a data transmission between the relay stations and base stations associated with the relay stations, and wherein an average number of multi-hop data transmissions in the radio communications system equals at least an average number of single-hop data transmissions.

A polyphase filtering choke arrangement of a power electronics appliance, more particularly of a frequency converter. which arrangement comprises two separate magnetic cores, around both of which a polyphase winding is arranged, particularly for filtering the harmonics of a network current and the common-mode noise currents, wherein both the magnetic cores (1, 2, 101a-101c, 102a-102c, 130a-130d, 140a-140d) are shaped to form a closed magnetic circuit, the magnetic cores (1 and 2, 101a-101c and 102a-102c, 130a-130d and 140a-140d) are arranged one on top of the other, the magnetic cores are connected to each other with connecting pieces (11-13, 11a-13b, 111-113, 121-124), and the winding directions of the windings of the magnetic cores are opposing with respect to each other, in which case the fluxes produced in the magnetic cores of each current are of opposing directions, in which case the flux produced by the difference-mode current circulates via the connecting pieces from one magnetic core to another.

There is provided a combination of doping process and use of side walls which allows the source and drain of a thin film transistor of an active matrix circuit to be doped with only one of N-type and P-type impurities and which allows the source and drain of a thin film transistor used in a peripheral circuit of the same conductivity type as that of the thin film transistor of the active matrix circuit to include both of N-type and P-type impurities. Also, a thin film transistor in an active matrix circuit has offset regions by using side walls, and another thin film transistor in a peripheral circuit has a lightly doped region by using side walls.

The invention provides a high-frequency magnet ring device for restraining very fast transient overvoltage (VFTO). The high-frequency magnet ring device is fixed on a center conductor of a gas insulated switchgear, and comprises an insulating sleeve, a plurality of magnet ring groups and insulating pieces. The insulating sleeve is sleeved on the center conductor, the magnet ring groups are parallelly sleeved on the outer wall of the insulating sleeve, and the insulating pieces are arranged between every two adjacent magnet ring groups. With the high-frequency magnet ring device, the defects of complicated structure, high production cost and low reliability of a VFTO restraining method in the prior art are effectively overcome.

The invention discloses a distribution network integrated lightning protection system comprising a transformer substation, and output lines led out of three phases of outlet ports of a transformer substation transformer. Each phase of line is connected in series with an overvoltage isolator. Overhead wires are formed through lead-out of the output ends of the voltage isolators to a pole tower. Pole tower insulating cross arms support the overhead wires, and power transmission wires are fixed via multifunctional wire clamps arranged on the insulating cross arms. A wave-resistant lightning rod is installed at the top end of the pole tower. A simple and rapid grounding device is embedded in the ground of the bottom part of the pole tower so that integrated lightning protection performed on the distribution network lines and the transformer substation is realized with pole tower protection acting as the center and prevention of distribution network lightning tripping and disconnection acting as the key points. Distribution network line dedicated lightning equipment like the wave-resistant lightning rod, the insulating cross arms, the multifunctional wire clamps and the simple grounding device are organically integrated by the system so that the multilayer and three-dimensional integrated lightning protection system is constructed and realized, lightning trip-out rate and disconnection rate can be substantially reduced, and maximum matching of distribution network lightning economical efficiency and effectiveness is realized.

The invention relates to an overvoltage protection device for a variable impedance transformer. The overvoltage protection device is characterized by comprising a resistance-capacitance absorption device connected with a selector switch (K) and an air reactor in parallel, wherein the resistance-capacitance absorption device comprises a resistor R and a capacitor C1 connected in series, and arresters (MOV) are connected with two ends of the capacitor (C1) in parallel. When in use, the air reactor is placed in the box of a transformer, and a high-speed switch is positioned on the outer side of an oil tank and connected between the high-voltage winding and the neutral point of the transformer in series. When the variable impedance transformer works normally, the high-speed switch is closed, a current-limiting reactor is short-circuited, and the reactor is prevented from causing energy loss; when the system is short-circuited, the high-speed switch is open, the current-limiting reactor is available, then the transformer is equal to a high impedance transformer at the moment, and the short circuit current is inhibited to a certain extent. The device provided by the invention is compact in structure and small in size, and can effectively reduce overvoltage amplitude and gradient caused during an impedance conversion process of the variable impedance transformer.

A method and a pulse sequence optimization device to optimize a pulse sequence for a magnetic resonance system, wherein the pulse sequence includes at least one refocusing pulse, one slice selection gradient pulse, and one gradient spoiler pulse. The pulse duration of the refocusing pulse is shortened, and the pulse duration of the slice selection gradient pulse is adapted to the shortened pulse duration of the refocusing pulse. The amplitude of the slice selection gradient pulse is increased so that the same slice thickness is selected as before the shortening of the pulse duration of the refocusing pulse. The pulse shape of the gradient spoiler pulse is adapted without changing a total spoiler moment, and an optimally shortened pulse duration of the refocusing pulse is achieved when, with the adaptation of the pulse shape of the gradient spoiler pulse, the maximum amplitude of the gradient spoiler pulse equals the amplitude of the slice selection gradient pulse, and an edge steepness of the gradient spoiler pulse is minimized.

A method is provided for edge formation of signals and transmitter / receiver component for a bus system. A transmitter / receiver component for a bus system comprises a driver transistor, which is to be looped between a bus line of the bus system and a reference potential and is used to output signals on the bus line, a control unit for the driver transistor, a high-frequency interference detector, which is configured in such a way that it detects a high-frequency interference level on the bus line of the bus system, whereby the control unit is configured in such a way that it controls the driver transistor, depending on the detected high-frequency interference level, in such a way that an edge steepness of the output signals increases when the high-frequency interference level on the bus line increases, and an edge steepness of the output signals decreases when the high-frequency interference level on the bus line decreases.

There is provided a display device equipped with a touch sensor that can decrease the area of the mounting surface with electromagnetic interference reduced. The display device includes a plurality of drive electrodes, an output circuit connected to the plurality of drive electrodes, a power supply circuit, and a resistor element. A power of the output circuit is connected to the power supply circuit through the resistor element.

In a cellular wide-area radio communications system, comprising a plurality of base stations; a plurality of relay stations; and a plurality of mobile stations; wherein each of the relay stations is associated with at least one of the base stations, each of the mobile stations is associated with at least one of the base stations or one of the relay stations, wireless data transmissions between mobile stations and base stations take place either as single-hop data transmissions between the mobile stations and their associated base stations, or as multi-hop data transmissions between the mobile stations and their associated relay stations and a data transmission between the relay stations and base stations associated with the relay stations, and wherein an average number of multi-hop data transmissions in the radio communications system equals at least an average number of single-hop data transmissions.

A leak-free injector (7) is proposed, the closing force of which is increased by a closing piston (43).

The invention relates to a method for making a semiconductor device. The method comprises the following steps of: removing pseudo stack to form an opening; etching a substrate from the opening to form a groove; generating an epitaxial layer in the groove by using an epitaxial growth process to form a doped pit; and forming a grid dielectric layer and a metal grid in the opening. By the method, the problems that in the conventional method, the steepness of the doped pit formed by utilizing ion implantation and annealing is reduced and a doping agent is incorrect led to a source electrode area and a drain electrode area are solved so as to improve the performance of the device.

The invention discloses a display panel, a manufacturing method thereof, and a display device. The display panel comprises a substrate, a buffer layer formed on the substrate, a semiconductor layer formed on the buffer layer, a gate insulation layer, a gate metal layer formed on the gate insulation layer, and medium layers, wherein the semiconductor layer comprises a source electrode area, a drainelectrode area and a channel area, the channel area is arranged between the source electrode area and the drain electrode area, the gate insulation layer is formed on the position, corresponding to the channel area, of the semiconductor layer, and the buffer layer, the semiconductor layer and the gate metal layer are covered with the medium layers; the medium layers corresponding to the source electrode area and the drain electrode area comprise passing holes correspondingly, the passing holes comprise first passing holes and second passing holes, the first passing holes are connected with the source electrode area or the drain electrode area, the second passing holes are located in the tops of the first passing holes and communicate with the first passing holes, and the hole diameters ofthe second passing holes is greater than that of the first passing holes. According to the display panel, by forming two lap joint holes with different sizes, the gradient of the passing holes is reduced during lap joint of metal wires, and the wires are not prone to breaking.

A polyphase filtering choke arrangement of a power electronics appliance, more particularly of a frequency converter. which arrangement comprises two separate magnetic cores, around both of which a polyphase winding is arranged, particularly for filtering the harmonics of a network current and the common-mode noise currents, wherein both the magnetic cores (1, 2, 101a-101c, 102a-102c, 130a-130d, 140a-140d) are shaped to form a closed magnetic circuit, the magnetic cores (1 and 2, 101a-101c and 102a-102c, 130a-130d and 140a-140d) are arranged one on top of the other, the magnetic cores are connected to each other with connecting pieces (11-13, 11a-13b, 111-113, 121-124), and the winding directions of the windings of the magnetic cores are opposing with respect to each other, in which case the fluxes produced in the magnetic cores of each current are of opposing directions, in which case the flux produced by the difference-mode current circulates via the connecting pieces from one magnetic core to another.

A portable ramp for non-wheeled cargo such as, but not limited to, a personal watercraft, designed to assist the movement of cargo in and out of a truck or trailer bed. The invention is both light weight and collapsible for easy portability and stow ability. The invention consists of a composition of parts that facilitate quick assembly and disassembly. A plurality of square hollow tube rails, a plurality of center masts, a connection sleeve and a plurality self-braking wheels assist in the conveyance of cargo uphill with free spinning wheels and slow the cargo's movement downhill by engaging the wheels into a friction pad. The invention uses a wire cable that runs along the bottom of the said rails to strengthen the assembled ramp. This wire cable has adjustable tension and is engaged by extending the center mast downward creating a triangle shape.

The invention discloses an arc extinguishing and lightning protection method based on a liquid-electric effect and a Pascal principle, and belongs to the technical field of arc extinguishing and lightning protection. The method comprises the steps that a sealing pipe is arranged, an upper electrode and a lower electrode are arranged at the two ends of the sealing pipe in a sealed mode respectively, insulating oil is arranged in the sealing pipe, a skirt edge is arranged on the side edge of the sealing pipe, when arc discharge is caused in the sealing pipe filled with the insulating oil, the electro-hydraulic effect generates impact waves rushing to the side wall, the Pascal effect enhances the electro-hydraulic effect, when the arc acts on the insulating oil and the pressure intensity of a certain part of the static insulating oil is changed, the arc is transmitted to all directions of the inner side of the sealing pipe without changing, impact waves of the liquid-electric effect and the Pascal effect impact the side edge and then return to impact, the arc channel which is aligned with the center is concentrated for impact arc extinguishing, and arc extinguishing is completed. According to the invention, the electric arc is cut off rapidly, the electric arc discharges in the liquid to generate a liquid-electric effect, impact pressure waves are formed rapidly, and the impact electric arc is cut off immediately when being formed.

The invention relates to the field of communication, and discloses an intensity-modulated directly received optical signal generating and receiving method. The method comprises the steps that a digital signal generating end inserts a carrier into an original DMT signal to obtain a double-sideband first DMT signal; and then the first DMT signal is subjected to intensity modulation and filtering toobtain a single-sideband optical signal. Since the single-sideband signal is transmitted in the optical fiber link, the influence of optical fiber dispersion on power attenuation in the signal transmission process is effectively reduced, and the transmission distance is greatly increased.

A leak-free injector is proposed, the closing force of which is increased by a closing piston. An injector has a nozzle needle and a control valve, the nozzle needle being guided in an injector housing and cooperating with a nozzle needle seat of the injector housing. A high-pressure chamber is present between the control valve and the nozzle needle seat, and the closing piston is provided on the nozzle needle. The closing piston subdivides the high-pressure chamber into a first region and a second region. The two regions of the high-pressure chamber communicate hydraulically via a closing throttle restriction.

The invention provides a VFTO protection device and method for a transformer in a GIS substation. The protection device comprises a lightning arrester, a capacitor, a discharging coil, a switch and a fuse, a series connection branch circuit composed of the fuse and the capacitor is connected to the two ends of the lightning arrester in parallel, and the fuse is located between the capacitor and the circuit; a discharging branch circuit composed of the discharging coil and the switch in a series connection mode is connected to the two ends of the capacitor C in parallel. According to the protection method, parameters of the capacitor C are obtained through calculation of the principle of the circuit wave process. Through the VFTO protection device and method for the transformer in the GIS substation, the substation having been put into operation does not need to change too much, the VFTO amplitude and steepness can be effectively suppressed, longitudinal insulation of the transformer is protected, and the VFTO protection device is convenient to install and high in working reliability.

A method for operating an internal combustion engine in which a valve needle of a fuel injector is adjusted from a closing position via an intermediate position to an opening position and back again. The adjustment is carried out with the aid of a piezoelectric actuator to which a trigger signal is applied. To reduce the contamination danger of the fuel injector and to keep wear of the valve needle low, the trigger signal for triggering the piezoelectric actuator has a greater slope steepness during the transition of the valve needle from the closing position to the intermediate position than during the transition of the valve needle from the intermediate position to the opening position.

A control device for a power output stage is proposed, which includes a power output stage control which generates a triggering signal as a function of at least one control signal, for triggering at least one power output stage, which switches an electric load, preferably an inductive load having a recovery diode, a recording device being provided which records a measure for an electrical magnitude, which is applied to electric load. A feedback system is also provided, which supplies the power output stage control with at least one feedback signal as a function of the measure for the electrical magnitude, so as to influence the trigger signal.

A piezoelectric thin-film filter reduces insertion loss and deterioration of steepness of a shoulder characteristic and reduces the ripple in the passband. In a first vibration portion, a piezoelectric thin film is disposed between a pair of electrodes along one main surface of a substrate. In a second vibration portion, the piezoelectric thin film is disposed between a pair of electrodes along the one main surface of the substrate. The vibration portions are both acoustically isolated from the substrate. In the first resonator, an additional film is disposed outside the electrode constituting half or more the overall length of the perimeter of the first vibration portion that is in contact with the electrode when seen from a thickness direction. In the second resonator, the external shape of the vibration portion when seen from a thickness direction is a polygon, and each side of the polygon is not parallel with any of the other sides thereof.

In a method and a pulse sequence optimization device to optimize a pulse sequence for a magnetic resonance system, wherein pulse sequence includes at least one refocusing pulse, a readout gradient pulse temporally situated after the refocusing pulse, and at least one readout spoiler pulse, the pulse duration of the readout gradient pulse is shortened while keeping the readout gradient moment constant, and the pulse shape of the readout spoiler pulse is adapted without changing a total spoiler moment. An optimally shortened pulse duration of the readout gradient pulse is achieved when, with the adaptation of the pulse shape of the readout spoiler pulse, a maximum amplitude of the readout spoiler pulse equals to the amplitude of the readout gradient pulse, and an edge steepness of the readout spoiler pulse is minimized.

The invention discloses an early discharge device and method for realizing dynamic insulation cooperation and belongs to the technical field of early discharge. The device comprises an insulator string and a cross arm; the cross arm is arranged on a tower pole; the insulator string is arranged on the cross arm; the device further comprises a thundercloud induction device, a high-voltage pulse generator, an insulating tube, an arc extinguishing device, an upper electrode and a lower electrode. The thundercloud induction device is connected with the high-voltage pulse generator to sense thundercloud signals and trigger the high-voltage pulse generator, the output end of the high-voltage pulse generator is connected with the upper electrode through an insulating tube by arranging a wire, andthe upper electrode is arranged in an arc extinguishing cylinder of the arc extinguishing device. The high-voltage pulse generator discharges in advance to generate free electrons, so that gap breakdown does not depend on the influence of the gradient and amplitude of lightning current, the volt-second characteristic is gentler, the amplitude and gradient of lightning waves invading a line after gap action are reduced, and lightning stroke protection safety of a power plant, a transformer substation and the like is ensured.

The invention discloses an arc-extinguishing lightning protection device based on a liquid-electric effect, and belongs to the technical field of arc-extinguishing lightning protection, the arc-extinguishing lightning protection device is set to a sealing pipe, two ends of the sealing pipe are respectively provided with an upper electrode and a lower electrode which are arranged in a sealing manner, the sealing pipe is internally provided with insulating oil, and the side edge of the sealing pipe is provided with a skirt edge. The electric arc is cut off rapidly, the electric arc discharges in the liquid to generate a liquid-electric effect, impact pressure waves are formed rapidly, and the impact electric arc is cut off immediately when being formed. The reignition of the impact arc is delayed, the continuous discharge condition and the reignition condition are destroyed by high voltage in the ceramic tube, after the impact arc is cut off, the reignition breakdown time is greatly delayed by more than ten to dozens of microseconds, the gradient of lightning current is remarkably reduced by 90%, and the current amplitude is attenuated by more than 50%.

The invention relates to a fast switch-based fast current-limiting circuit adopting a forced zero-cross principle. The fast current-limiting circuit comprises a system main loop, wherein an isolationswitch K1, a fast vacuum circuit breaker S1, a saturated inductor L1 and an isolation switch K2 are connected in series in sequence so as to form the system main loop, an absorption capacitor C1 and an absorption resistor R1 are connected in series so as to form a resistor-capacitor absorption circuit and then the resistor-capacitor absorption circuit is connected between fractures of the fast vacuum circuit breaker S1 in parallel, two ends of the fast vacuum circuit breaker S1 and the saturated inductor L1 are separately connected with a current-limiting reactor L3 and a zinc oxide resistor M1 in parallel, a converter capacitor C2, a converter inductor L2, a spark gap G and a high voltage fuse F1 are connected in series so as to form a forced zero-cross loop and then the forced zero-crossloop is connected between two ends of the fast vacuum circuit breaker S1 and the saturated inductor L1 in parallel, and two ends of the converter capacitor C2 are connected with an absorption resistor R2 and a transformer energy storage loop in parallel. The fast current-limiting circuit has the beneficial effects of better limiting fault current, resisting higher current impact, guaranteeing circuit security, and lowering the harm of a short circuit fault to the power system.

A backlight assembly with a light source unit, includes: a drive signal generator which generates a switching drive signal on the basis of a predetermined drive frequency and a feedback power fed back from the light source unit; a switching unit which outputs a power to the light source unit in response to the switching drive signal; and a controller which decreases the drive frequency if the feedback power is higher than a predetermined critical value.

An electroluminescent display (EL) device and a method of manufacturing the same. The EL device includes a substrate, a first electrode unit including first electrodes formed on the substrate in a predetermined pattern, and first electrode terminals connected to the respective first electrodes; a second electrode unit including second electrodes formed on the first electrodes, and second electrode terminals connected to the respective second electrodes; an emission area formed where the first electrodes intersect the second electrodes, an electroluminescent layer disposed between the first electrodes and the second electrodes in the emission area, and an outer insulating layer between the emission area and the second electrode terminals; wherein the outer insulating layer comprises an insulating material formed to contact at least an edge of the second electrode terminals facing the emission area to reduce a steepness of a step between the second electrode terminal and the substrate.

The invention discloses a heald frame bending mode control device, which is composed of vibration absorbers in beams. Each beam is internally provided with three vibration absorbers, wherein one vibration absorber is arranged at the middle part of the beam, the other two vibration absorbers are arranged at the two sides of the beam, and the distance from each of the vibration absorbers at two sides to the center of the beam is a quarter of L which is the total length of the beam. Each vibration absorber comprises a hollow outer tube with a rectangular transverse section. Both ends of each outer tube are covered with shock insulators. A mass block corresponding to the length of the outer tube is arranged in each outer tube, and is connected to the corresponding shock insulators through copper sheet springs at both ends, so that the mass block can be hung in the corresponding outer tube to form a cavity which is filled with elastic high polymer materials. As the vibration absorbers are arranged in the inner cavities of the heald frame beams, vibration is alleviated, and the wall thickness of the beam is reduced so as to lighten the weight of a heald frame and improve the dynamic operating conditions of the heald frame.