66results about How to "Reduce diversion" patented technology

An intermediate region is formed at a central portion of an element in a track width direction, and an antiferromagnetic layer is not provided at the intermediate region. Accordingly, a sense current can be prevented from being shunted to the intermediate region, and as a result, improvement in reproduction output and strength against magnetic electrostatic damage can be realized. In addition, since the thickness of the central portion of the element is decreased, trend toward narrower gap can be realized. Furthermore, since the direction of magnetization of a free magnetic layer is oriented in the track width direction by shape anisotropy, means for orienting the magnetization is not necessary, and hence the structure and manufacturing method of the element can be simplified.

A device for reducing drag between high-speed multiple unit trains belongs to the technical field of railway carriages and is used for reducing air drag. The technical scheme of the device is as follows: the device for reducing drag between high-speed multiple unit trains comprises side windshields which are arranged at sides of each train body end wall, each side windshield comprises a strip rubber bag and a rubber bag frame, the shape of the strip rubber bags is matched with arc lines of the sides of the train body end walls, and the rubber bags are connected with the train body end walls bythe rubber bag frames. The device has simple structure and convenient and rapid installation, the multiple units need not to be broken up or made up, and the device can greatly reduce the air drag which is generated as air flow impacts the train body end walls, thus increasing the running speed of trains.

A permanent magnet (PM) electric generator with directly controllable field excitation control comprises: a drive shaft; a PM rotor assembly with multiple PMs arranged around an outer axial periphery of the rotor assembly; a stator assembly comprising a ferromagnetic stator yoke, multiple ferromagnetic stator teeth mounted to the stator yoke with distal ends proximate the outer axial periphery of the rotor assembly separated by an air gap and multiple stator coils mounted between the stator teeth; multiple saturable ferromagnetic shunts, each shunt coupling adjacent distal ends of the stator teeth to shunt air gap magnetic flux Φ_g generated by the PMs across the air gap through the distal ends of the stator teeth; and multiple saturation control coils, each saturation control coil wrapped about a saturable region of an associated one of the shunts; wherein application of a control current I_c to the control coils at least partially magnetically saturates the shunts to reduce shunting of air gap magnetic flux Φ_g, thereby increasing magnetic flux linkage Ψ_M between the PMs and the stator coils and increasing generated electromagnetic force (EMF) at lower levels of rotor assembly angular velocity.

Airports, air routes and controlled sectors constitute an air traffic dependent network. When nodes are disturbed, the network transport performance degrades, which leads to network vulnerability. Theinvention provides a method for measuring the vulnerability of an air traffic dependent network. Firstly, an airport network, an air route network and a control sector network are constructed, and anair traffic dependent network model is established based on the logical connection relationship between the air traffic management rules and the layer network. Under two different failure modes of random disturbance and deliberate disturbance nodes, the structural vulnerability of dependent networks is analyzed by using the maximum connectivity and structural entropy. Flow entropy and traffic flow loss ratio are established to study the functional vulnerability of dependent networks. The results show that stochastic disturbance has more influence on the air traffic dependent network. The structural and functional fragility of the network is the airport network; the vulnerability of the network is related to the mismatch between the connectivity of the layer networks and the traffic volumeof the layer networks.

A system and method for detecting and limiting line resource occupation by calling back. The system is composed of a plurality of signaling message detecting and processing units MPM connected to related seventh signaling links and an operational management center CSM. The MPM detects the flowing signalling messages, and acquires the related messages onto the CSM; the CSM discovers callback access numbers according to callback service characteristic, synchronizes a blacklist generated by callback numbers required to limit to each MPM; and then the MPM realizes the limitation processing of subsequence call according to black and white list and service regulation. The invention can be independently implemented without improving the existing network device, can simultaneously realize quick discovering and limitation of callback numbers on one system, and can avoid problems of other modes required for modifying the existing network device data, difficulty in discovering related numbers, complicated use and the like. The system provides convenient and effective approach for limiting abnormal callback services of telecom operator, and avoids invalidation occupation and service distribution.

The invention provides a surge protection circuit. The surge protection circuit comprises a bidirectional voltage suppressor and a thyristor-type surge suppression unit, wherein the thyristor-type surge suppression unit is connected with the bidirectional voltage suppressor in parallel; the first end of the bidirectional voltage suppressor is connected with the first end of the thyristor-type surge suppression unit; the second end of the bidirectional voltage suppressor is connected with the second end of the thyristor-type surge suppression unit; the surge protection circuit is characterized in that the breakover voltage or breakdown voltage in the direction from the first end to the second end of the thyristor-type surge suppression unit is higher than the clamping voltage in the direction from the first end to the second end of the bidirectional voltage suppressor; the breakover voltage in the direction from the second end to the first end of the thyristor-type surge suppression unit is smaller than the clamping voltage in the direction from the second end to the first end of the bidirectional voltage suppressor. The invention further provides an electronic device with the surge protection circuit.

The invention discloses a dynamic zero-pole tracing compensating circuit, and belongs to the technical field of compensating circuits. The dynamic zero-pole tracing compensating circuit comprises a main power tube MPOW2 and an auxiliary power tube MPOW1, a grid electrode of the main power tube MPOW2 is connected with a grid electrode of the auxiliary power tube MPOW1, the auxiliary power tube MPOW1 is connected with a power source VDD through a resistor Rs1, and the main power tube MPOW2 is directly connected with a voltage VDD. The structure is simple, a dynamic compensation technology can berealized with only one source electrode feedback resistor RS1, the cost for the circuit according to the area is lowered greatly, and costs are lowered; only one auxiliary power tube access is arranged in the circuit, in this way, shunting for the main power tube is reduced greatly, the capacity of voltage regulation of a whole LDO cannot be affected, and the integral performance index of the LDOis promoted; an operational amplifier does not need to be used, so that the complexity of the circuit is low, and the circuit is easy to obtain. In this way, the dynamic zero-pole tracing compensating circuit is high in transportability, adaptability and robustness.

The invention discloses a high-frequency pulse digital ground resistance tester. The high-frequency pulse digital ground resistance tester comprises a power source, a high-frequency pulse generator, ameasured ground resistor circuit, an analog-to-digital conversion circuit, an MCU and a display device. The power source is used for supplying electric power to the tester. The high-frequency pulse generator is used for generating 20KHz square waves with the duty ratio being 50%, and inputting the square waves into the measured ground resistor circuit. The analog-to-digital conversion circuit isused for converting testing voltage of the measured ground resistor circuit into a digital signal and transmitting the digital signal to the MCU to process. The MCU calculates the received digital signal and calculates a resistance value of a measured ground resistor. The waveform of a square wave of a measured grounding point is displayed in the display device. The MCU is also used for controlling the analog-to-digital conversion circuit. The tester has the advantages that voltage waveforms of to-be-measured points can be displayed through a display screen, and the types of ground resistors of the to-be-measured points can be further determined; the high-frequency pulse digital ground resistance tester is powered by a rechargeable battery, external interferences are reduced, field operations are facilitated, the tester is portable, and testing is facilitated.

The invention discloses a current-to-voltage conversion circuit with input bias and active power filtering effects and a current-to-voltage conversion method. The current-to-voltage conversion circuit with the input bias and active power filtering effects comprises an operational amplifier A1 and a bias current source; after being in parallel connection with the bias current source, a current signal (Is) is connected to a reverse input end of the operational amplifier A1; a forward input end of the operational amplifier A1 is connected with the ground; an output end of the operational amplifier A1 is connected with a reverse input end of the operational amplifier A1 through a capacitor C1 and is connected to a parallel-connection node between the bias current source and the current signal (Is) through a negative feedback resistor R3; and the node is in parallel connection with a capacitor C2 in a grounding manner. Input bias is implemented through the current source, active power filtering and current-to-voltage conversion are implemented through the operational amplifier, the circuit is simple, the cost is low, and the application prospect is high.

The invention discloses an electric power grid telegraph pole which structurally comprises an amplitude limiting damping frame, a wind resistance flow division ring, a balance rod and a grounding cone, wherein the bottom of the amplitude limiting damping frame is connected with the balance rod. The electric power grid telegraph pole has the beneficial effects that on one hand, the elastic potential energy of the amplitude limiting damping frame is used for bending the structure arc; the fracture because the structure cannot resist wind power impact force is avoided, so that the continuous worsening of abnormality conditions of an electric power transmission electric wire suffered from wind power stretching can be prevented; on the other hand, the wind resistance flow division ring is usedfor realizing the isolation on the wind power impacting the surface so as to achieve the goal of flow division; meanwhile, the gravity center of the telegraph pole is maintained to be always vertically downward through the balance rod; and the gravity center deviation at the bottom of the balance rod is regulated by a special structure that the weight of a gravity center pulley structure is incoordinate, and the inclination speed acceleration of the telegraph pole is prevented.

The invention relates to a method for charging a battery pack. The method comprises three charging steps, in step 1 the charging current is increased from zero to a set value Im according to a specific mathematical function, and step 2 and step 3 are respectively conventional constant current charging and constant voltage charging. The charging method of the invention helps to reduce the bias current phenomenon of the battery pack during charging and prolong service life of the battery pack.

The invention discloses a classroom state evaluation method and related device and equipment, and the method comprises: obtaining image data; identifying a target object in the image data, and determining identity information of the target object and expression information of the target object; and evaluating the classroom state of the target object based on the expression information and a preset analysis standard. According to the scheme, the classroom state of the target object in the classroom can be analyzed through the expression information of the target object under the condition that the target object is non-inductive, external environment interference is reduced, and objectivity and reliability of a classroom state detection result are guaranteed to a certain extent.

The invention discloses a device for removing freeze-adhered coal on the surface of a belt. The device comprises a stripping mechanism and a sweeping mechanism, wherein the sweeping mechanism is located behind the stripping mechanism; the stripping mechanism is composed of spiral rollers (2), a spiral roller support (1), a spiral roller bearing (5), supporting rollers (3), a supporting roller support (12), a supporting roller bearing (4), a compression adjusting mechanism support (6), a screw rod (7), a nut sliding block (8), a limiting shaft sleeve (10) and a spiral roller support connectingbearing (9); and the sweeping mechanism is composed of a scraping plate (17), a scraping plate support (14), a support connecting rod mechanism (15), an electro-hydraulic push rod (16) and a scrapingplate supporting carrier roller (18). According to the device, when the belt (11) runs, the spiral rollers (2) and the supporting rollers (3) are driven to rotate, so that the freeze-adhered coal powder attached to the surface of the belt are effectively stripped off, the freeze-adhered coal powder are transferred to the ground on the two sides of the belt through the sweeping mechanism, and therefore the phenomenon that the belt is wrapped and even damaged due to the fact that the freeze-adhered coal powder are attached to a rotating guide roller is prevented.

The invention discloses a hydraulic system of a telescopic boom, the telescopic boom and an engineering vehicle. The hydraulic system comprises a first oil way, multi-stage telescopic cylinders, a second oil way, a balance valve, a second one-way valve, a throttling valve, a third oil way and a control oil way; rodless cavities of the telescopic cylinders are communicated with the first oil way, and synchronous oil inlet or oil return is conducted on the rodless cavities of the telescopic cylinders through the first oil way; rod cavities of the telescopic cylinders communicate with the secondoil way, and synchronous oil inlet or oil return is conducted on the rod cavities of the telescopic cylinders through the second oil way; the balance valve is arranged on the first oil way, and the control oil way communicates with the control end of the balance valve and the second oil way; and the third oil way is connected between the first oil way and the second oil way, the second one-way valve and the throttling valve are arranged on the third oil way, the throttling valve is arranged on the oil outlet side of the second one-way valve, and oil in the third oil way can flow to the first oil way through the second one-way valve. According to the hydraulic system of the telescopic boom, the telescopic boom and the engineering vehicle, shaking can be effectively reduced.

The patent relates to the wine-making technology field and specifically relates to a guiding device of a winery condenser; the guiding device comprises a guiding pipe connected with the condenser outlet, the inner wall of the guiding pipe is connected with a hollow sound insulation pipe, at least two layers of deadening felts are arranged in the pipeline wall of the hollow sound insulation pipe, a plurality of ribs with square cross sections are arranged in the pipeline t through hole of the hollow sound insulation, and a buffer groove area where buffer water flow is formed can be formed between said two ribs; flow is guided and noise is reduced by adopting the guiding device of the winery condenser of the technical solution.