52results about How to "Build stability" patented technology

The invention discloses a starting method of a high-voltage direct current transmission system. If the communication between stations fails and a frequency control function operates, a current instruction at a rectifier side is set to be 1.0pu, and meanwhile, the voltage reference value compensation of a constant voltage controller at the rectifier side is cancelled, the voltage reference value compensation is added at an inverter side, and voltage reference values at two sides are set; the inverter side is unlocked, and the inverter side is forced to work in a constant extinction angle control mode; the rectifier side is manually unlocked, a shift phase command is released after the rectifier side is unlocked, and the constant voltage controller at the rectifier side operates when the output of a constant current controller at the rectifier side drops to be equal to the output of the constant voltage controller; the direct current voltage at the inverter side is detected, and the current margin is compensated; and the inverter side enters a constant current control mode, the current is controlled at the minimum operating current, and then the starting process is finished. Through the starting method, the controllers at the two sides can be coordinated to work under the condition that the communication between stations fails, and the constant voltage control at the rectifier side and the constant current/power control at the inverter side after starting are realized.

The invention discloses a duty ratio calibration circuit of a precharge logical digital clock, which comprises an input buffer stage BUF, a cycle delay line HCDL, a matching delay line MDL, a RS trigger and a power control module PM. The duty ratio calibration circuit of the invention has the advantages of rapid establishment (1.5 clock cycles), relative stability and no accumulative effect of duty ratio calibration errors. Compared with some duty ratio calibration circuits based on digital detection and adjustment mode, differential precharge logic is adopted in the invention to construct a basic delay unit, so that the calibration circuit of the invention has smaller delay time, thereby obviously improving the upper limit of the working frequency of the circuit and the calibration accuracy. In the invention, the RS trigger with a novel structure is used for realizing more accurate matching of time delay of paths from a setting end to an output end and from a resetting end to the output end and keeping consistent characteristics under the condition of each technological angle.

The invention discloses a method for restoring vegetation on high and steep slopes by the aid of coiled plant materials. The method includes operation steps of 1), cleaning slope surfaces; 2), constructing anchor rods; 3), hanging nets; 4), laying the coiled plant materials; 5), secondarily hanging nets; 6), fixing the nets and the coiled plant materials; 7), watering and maintaining the slope surfaces. The method has the advantages that the stability of substrates on the slope surfaces can be effectively maintained, the substrates are high in erosion resistance, construction processes are simple, the vegetation can be managed and maintained easily and conveniently in later periods, the slope surfaces can be effectively closed, and weathering and peeling of the slope surfaces can be prevented.

The invention successfully screens a virus strain VR18 suitable for building an animal model of CA16 infection and builds the animal model of the CA16 virus infection by infecting a suckling mouse with the virus strain VR18. The invention also relates to a method for building the animal model of the CA16 injection and the use of the virus stain VR18 in the building of the animal model of the CA16infection and the like. The method provides valuable experiment data for study on CA16 vaccines.

The present invention discloses a 3D printing special engineering plastic support material and a preparation method of wires of the support material. The material is composed of the following components by weight percentage: 75-90 parts of polycarbonate resin; 5-15 parts of reinforcement material; 1-10 parts of compatibilizer; 2-5 parts of plasticizer; and 0.1-3 parts of antioxidant. The supporting wires prepared by the material ensures the stable establishment of a support portion in a 3D printing process of special engineering plastics under high temperature environment, is well bonded withthe special engineering plastics such as PEEK (polyetheretherketone), polyetherimide, PES (polyether sulfone), PEKK(polyetherketoneketone), PPS (polyphenylene sulfide), poly(phenylene sulfone),etc. atthe same time, products are put into a non-toxic environment-friendly solvent after printing is finished, and the support portion can be quickly removed by dissolution or swelling. The preparation method of the 3D printing support material of the invention has high chemical stability and a simple production process, an existing twin-screw extrusion mechanism can be used for preparation, and the 3D printing special engineering plastic support material is easy to prepare, suitable for industrial production and conducive to the market promotion of the 3D printing material.

The invention provides a crude oil electric dehydration high voltage power supply device, relates to crude oil electric dehydration high voltage power supply devices, and aims at solving the problems of continuous discharge of high voltage dehydration electrodes, collapse of high voltage dehydration electric fields and increasing of capacity requirement of the high voltage power supply devices during crude oil electric dehydration process. The crude oil electric dehydration high voltage power supply device performs pressure regulating and current-limiting on low voltage alternating current and then performs boosting through a high voltage transformer, two paths of high voltage outputs of the high voltage transformer are rectified by a first high voltage silicon stack and a second high voltage silicon stack, formed into high voltage direct current with positive polarity and negative polarity, and output to a high voltage fast pulse unit. A microprocessor control unit judges whether dehydration electrodes form ripples according to voltage and current monitoring values and controls switching of the high voltage fast pulse unit. Under a normal dehydration condition, the high voltage fast pulse unit outputs direct current with positive and negative polarity, and when short circuits are caused by existence of ripples, the high voltage fast pulse unit exerts batch-type high voltage large current pulse to load till the ripples are opened, and accordingly electric fields in a dehydration container are recovered. The crude oil electric dehydration high voltage power supply device is applied to the crude oil processing process.

The invention provides a control method for an electromagnetic valve of an automatic transmission and relates to the technical field of control over the automatic transmission. The control method aims at solving the problem that an existing electromagnetic valve of an automatic transmission is low in response speed. The control method for the electromagnetic valve of the automatic transmission includes the steps that firstly, a current I keeping the electromagnetic valve in a dead zone critical point is found according to the current and plunger position characteristics of the electromagnetic valve; secondly, when the electromagnetic valve does not work, a current I1 is kept for the electromagnetic valve, the current I1 is larger than the current I and smaller than a clutch kisspoint current, the electromagnetic valve has a tiny opening degree, and it is guaranteed that tiny oil pressure exists between the electromagnetic valve and a corresponding clutch; and thirdly, when the electromagnetic valve prepares to start to work, a working current I2 is continuously supplied to the electromagnetic valve, the current I2 is quickly increased on the basis of the current I1, and it is guaranteed that the oil pressure of the clutch corresponding to the electromagnetic valve is gradually increased. The control method has the beneficial effects that the working response speed of the electromagnetic valve is high, and the oil pressure of the clutch is more stably established, gear shifting control over the automatic transmission is facilitated, and the gear shifting feeling of a vehicle is improved.

The invention discloses a construction method for an early-warning supporting system adjacent to a running subway in a complex environment. The construction method includes the steps that firstly, two rows of stirring piles are arranged on the inner side and the outer side of a building even wall planned to be built correspondingly for supporting; secondly, the building even wall is built between the two rows of stirring piles; thirdly, supporting of multiple first high-pressure rotary spraying piles and multiple secondary high-pressure rotary spraying piles is adopted on the outer side of a subway station even wall and the outer side of the building even wall correspondingly through high-pressure rotary spraying; fourthly, a sleeve valve tube system is installed at the interface of the outer side of the subway station even wall and the outer side of the building even wall; fifthly, a circle of cap beam is poured on the top of the building even wall; and sixthly, a foundation pit is dug on the inner side of the building even wall in a layered manner. In the digging process of the foundation pit, if a clinometer installed on the subway station even wall sends out a deformation pre-warning signal, a grouting system of the sleeve valve tube system is started immediately till the pre-warning signal is stopped, and then construction is continuously conducted. According to the construction method, stable establishment of the pre-warning supporting system is ensured.

The invention discloses a method for establishing a mouse castrating high-ferrum osteoporotic model. The method comprises the steps that an 8-week-old ICR female mouse is selected and bilateral oophorectomy is conducted on the mouse; one week after the oophorectomy is conducted, FAC is started to be injected in the abdominal cavity and the mouse castrating high-ferrum osteoporotic model is obtained after 7 weeks. Currently, ferric accumulation happens to most clinic postmenopausal women. Recently, many researches show that ferric accumulation is a high risk factor of osteoporosis. However, a traditional castrating osteoporotic model is normal in ferric level and can not completely simulate the postmenopausal women. Compared with a traditional model, the mouse castrating high-ferrum osteoporotic model established through the method is more close to clinic phenomena.

The invention provides an indoor modeling unmanned aerial vehicle and an indoor modeling method based on VR photography. According to the indoor modeling unmanned aerial vehicle, a self-stabilizing device is arranged between an unmanned aerial vehicle body and a panoramic camera bracket, the panoramic camera support can be well kept stable, so that a camera can shoot a stable real scene, and meanwhile, accurate space coordinates are calculated through the distance measured by the distance sensor, so that an unshielded and stable VR panoramic image is obtained, and a point cloud three-dimensional model is accurately established.

The invention belongs to the field of cell engineering, and particularly relates to a method for establishing kidney organoids through stem cell induced differentiation. By adjusting Wnt, TGF-beta and FGF signal channels, human pluripotent stem cells are directionally induced and differentiated into kidney progenitor cells, then the progenitor cells are made into a single-cell suspension, and the kidney organoids are formed through self-assembly. The method through stem cell induced differentiation, provided by the invention can efficiently and stably establish the kidney organoids, and can provide a powerful platform for researching kidney diseases and evaluating kidney toxicity.

The invention discloses a vibration monitoring and safety early warning method in the bridge rotation process, which comprises the steps of S1, carrying out stress analysis on a bridge to obtain an overturning bending moment borne by the bridge in the rotation process and a condition required when the bridge does not overturn; S2, simplifying the rotation process of the bridge to obtain the relationship between the bending moment caused by the rotation vibration of the structure and the vertical acceleration of the beam end; and S3, on the basis of the steps S1 to S2, obtaining a beam end vertical vibration acceleration limit value in the bridge rotation process, and performing safety early warning according to the beam end vertical vibration acceleration limit value. According to the invention, overall stability monitoring can be achieved, the relation between the vibration monitoring variable and the overall stability in bridge rotation can be effectively established, the overturning danger degree of the structure can be quantitatively reflected, and meanwhile, through the safety early warning technology, the method can be suitable for vibration monitoring in the rotation process of various continuous beam bridges and cable-stayed bridges.

The invention discloses a sealing structure for bearing lubrication. The sealing structure comprises a bearing pedestal used for installing a bearing and an outer baffle ring used for preventing lubricating grease from splashing outwards, the bearing pedestal is provided with at least two inner grease storage chambers distributed in the circumferential direction, and the outer baffle ring is provided with at least two outer grease storage chambers distributed in the circumferential direction; and rib plates are arranged between any two adjacent inner grease storage chambers and any two adjacent outer grease storage chambers, the rib plates in the bearing pedestal are provided with first through grooves used for allowing lubricating grease to enter the bearing, and the bearing pedestal is further provided with a grease injection port and a first grease injection channel communicating with the grease injection port and the first through grooves. The sealing structure for bearing lubrication can continuously supply base oil to a rolling bearing, so that the problem of poor lubrication of a large bearing in a high-speed motor is effectively solved, the service life of the bearing is favorably prolonged, and less maintenance and even no maintenance of the bearing are realized.

The invention discloses a zero-power starting method for a direct current transmission system. Single-pole full-voltage starting, single-pole reduced-voltage starting, double-pole full-voltage starting and double-pole reduced-voltage starting are adopted in a common direct current transmission system starting method, and due to the fact that the common starting method is limited by the minimum starting current and the minimum starting voltage, power cannot start from zero after the direct current system is started. The power transmission directions of two poles of the direct current transmission system are set to be different, the unlocking time sequences of the two poles are coordinated, the voltage and the current of the two poles are established at the same time, and therefore the power from a sending end to a receiving end is zero after the direct current system is started, and then the power from the sending end to the receiving end can be adjusted by adjusting the power of a positive sending pole. When a sending end or receiving end power grid is a weak alternating current system, the impact to the alternating current system can be lowered through the starting mode.

The invention provides a full-mechanical-pressure bottle cap forming machine which comprises a rack, a bottle cap forming die and a drive mechanism for driving the bottle cap forming die to be opened and closed. The bottle cap forming die comprises upper die bodies and lower die bodies. The drive mechanism comprises a forming rod, a turning cam mechanism and a stabilizing device, wherein the forming rod is arranged on the rack in a vertical movement mode, the turning cam mechanism drives the forming rod to conduct vertical reciprocating movement, and the stabilizing device makes the forming rod to move downwards to reset. The forming rod comprises an upper section, a lower section and an elastic element, wherein the upper section and the lower section are connected in a coaxial mode, and the elastic element is connected between the upper segment and the lower segment in a compressed mode and makes the upper segment and the lower segment have a vertical separation trend. The lower dies are fixed to the upper end of the upper section of the forming rod, and the upper dies are arranged on the upper portion of the rack and correspond to the upper portions of the lower dies. According to the full-mechanical-pressure bottle cap forming machine, a mechanical structure is adopted to provide stable forming pressure, a hydraulic system is replaced, the structure of the bottle cap forming machine is greatly simplified, the bottle cap forming die opening/closing process is smooth in movement, the bottle cap forming pressure is easy to adjust, and it is guaranteed that the forming pressure is stable.

The invention discloses a distributed top pressure power generation system and a regulation and control method on the basis of a multi-objective optimization algorithm. According to the characteristics of input end working medium parameters (such as flow, temperature, pressure difference) and changeable output end load demand and difficult prediction of the distributed top pressure power generation system, the high system output stability, the high running efficiency and the long equipment service life are the objectives, a multi-objective optimization model of the distributed top pressure power generation system is established, the opening degrees of all valves in the system are solved in real time through a non-domination ranking genetic algorithm, and thus the system running efficiencyis improved. Through the multi-objective optimization algorithm, the opening degrees of all electric adjusting valves in the system can be optimized in real time according to change of parameters of the energy supply side and the energy using side, thus the purposes of improving the stability of the distributed top pressure power generation system, prolonging the equipment service life, improvingthe running efficiency and the improving the economic benefits are achieved, and the wide commercialized application prospects are achieved.

The invention relates to a wireless communication system. The wireless communication system comprises a communication module, an aircraft, a control station and a communication link, The control station comprises a display system and a control system. Wherein the communication link comprises an airborne device and a ground station; Wherein the aircraft, the control station and the communication link are respectively provided with communication modules and are connected with one another through the communication modules, and the communication modules can be in wireless communication in the Internet; Wherein the airborne device is arranged on an aircraft and establishes a wireless link capable of communicating with the ground station, and the control station sends a control signal through the communication module to control the flight operation of the aircraft; According to the invention, communication with the unmanned aerial vehicle is established through the communication module, anda mobile phone or a ground station is prevented from being connected with the data transmission module in a wired manner for data transmission and forwarding; The system has the advantages of being small in size and convenient to operate, and meanwhile a stable and reliable wireless link with enough communication radius is established.

The invention discloses an induction femoral artery compression hemostat. The hemostat comprises an adjusting device, a battery bin cover, a motor, an adjusting column, a flexible base plate and a plurality of bandages. The bandages are hung on the adjusting device, the battery bin cover is connected to the upper end of the adjusting device, and the motor is arranged in the adjusting device and connected with the adjusting column in a nested mode; and the adjusting column is sleeved with a telescopic sleeve. The flexible base plate is arranged at the lower end of the adjusting device, a supporting block is arranged on the flexible base plate, the supporting block is fixedly connected with the adjusting column, and a pressure sensor is arranged in the supporting block. Compared with the prior art, the induction femoral artery compression hemostat has the advantages that the length and the diameter of the puncture outfit can be adjusted at will through the adjusting device of the rhombic structure, operation steps of a doctor are greatly simplified, and the equipment selection time and the operation time are shortened; the sleeve assembly is made of plastic materials, and it is guaranteed that the wave structure at the lower end has certain elasticity. The puncture effect is good, and an operation channel can be accurately and firmly established.