1871results about How to "Reduce loss" patented technology

In an embodiment, a sealant composition comprising a swelling agent is displaced into a wellbore penetrating a subterranean formation to maintain isolation of the formation. The sealant composition may be displaced into a permeable zone through which fluid can undesirably migrate. In another embodiment, the sealant composition comprising the swelling agent is displaced into the wellbore to reduce a loss of a fluid to the formation during circulation of the fluid in the wellbore. The fluid may be, for example, a drilling fluid, a secondary sealant composition, a fracturing fluid, or combinations thereof. The sealant composition may be displaced into a flow pathway through which fluid can undesirably migrate into the formation. In both embodiments, the swelling agent contacts water such that it swells and thereby reduces fluid flow through the permeable zone/flow pathway. The swelling agent may comprise a crosslinked co-polymer.

An embodiment includes a method of servicing a well bore. The method may comprise introducing a lost circulation composition into a lost circulation zone, the lost circulation composition comprising hydraulic cement, nano-particles, amorphous silica, clay, and water. The method further may comprise allowing the lost circulation composition to set in the lost circulation zone. Another embodiment includes a lost circulation composition. The lost circulation may comprise hydraulic cement, nano-particles, amorphous silica, clay, and water.

A system for authenticating a purchaser, collecting data of purchasers, and displaying personalized advertisements. The system uses video cameras to capture an initial image of the customer upon entry and/or at the register prior to checkout. The image is then sent via LAN or wireless LAN to a computer with image recognition software. The computer is connected to a credit card reader and to an in-store database where it can then be checked for a matching image. The database will then choose from a pool of advertisements to find one that matches the current customers shopping habits most accurately. The advertisement will then be projected onto a monitor in the customer's field of vision. At checkout, if the customer pays with a credit card, the information on the card will be sent to the computer where it will also be checked for a match in the database. The in-store database is connected with a larger central database which shares all recorded information with all stores.

The invention discloses a user interface (UI) distribution self-adaption method, a mobile device and a distribution generating device. The UI distribution self-adaption method includes the steps of obtaining a distribution file corresponding to changed display status from a distribution file stored inside the mobile device when the display status of the mobile device changes and adjusting UI distribution of the device according to the obtained distribution file. The UI distribution self-adaption method, the mobile device and the distribution generating device has the advantages of solving the technical problems in the prior art of high configuration requirements of the device and overlong self-adaption time caused by the UI self-adaption process which dynamically conducts inside the device through a container and achieving technical effect of reducing consumption time of self-adaption and resource losses of the system.

The invention discloses a method for extracting flavonoids from ginkgo biloba leaves with a deep eutectic solvent. The ginkgo biloba leaves are used as raw materials, the choline deep eutectic solvent is used as an extracting agent, water is used as a diluent for decreasing the system viscosity, the flavonoids are extracted under the ultrasonic intensification, the choline deep eutectic solvent is a room-temperature molten salt liquid of ethylene glycol-oxalic acid-choline chloride, and the molar ratio of ethylene glycol to oxalic acid to choline chloride in the room-temperature molten salt liquid is 1:1:1. The method has the advantages as follows: the extraction method has the characteristics that the extracting agent does not explode and volatilize, the loss is low, the energy consumption is low, potential risks are avoided, the operation is convenient, industrialization is easy, the efficiency is high and the like, and the method can be applied to efficient and green large-scale production of the flavonoids and realization of comprehensive utilization of ginkgo biloba leaf resources.

The invention discloses a control method and device for the self-cleaning of an air conditioner indoor unit and belongs to the technical field of air conditioner cleaning. The control method comprises: controlling an air conditioner to run in a refrigerating mode and closing a fan of the indoor unit; detecting the temperature of a coiled pipe of the indoor unit, and controlling the fan to run at a first rotating speed for a first duration when the temperature of the coiled pipe is lower than a frosting critical temperature; and controlling the air conditioner to run in a heating mode, and carrying out defrosting cleaning on the indoor unit. According to the control method, by carrying out refined operation on the fan of the indoor unit, the losses of cold air before the frosting critical temperature is reached can be reduced, the flow of air in the indoor unit can also be accelerated through the running of the fan after the frosting critical temperature is reached, temperature and vapor distribution is uniform, and frosting thickness is even.

A system and method for vending digital video discs is provided. A request is received from a user to complete a rental transaction for a first digital video disc. A database is queried to determine whether a quantity of a set of second digital video discs in a vending inventory exceeds a predetermined threshold. A discount offer notification is presented to the user to rent one of the set of second digital video discs, upon determining that the quantity of the set of second digital video discs exceeds the predetermined threshold. A second request from the user to rent one of the second set of digital video discs is received, and one of the set of second digital video discs is vended to the user.

The invention provides systems, methods, and devices relating to the provision of system-wide coordinated control voltage regulation support in power transmission and distribution networks using multiple inverter based power generation facilities, which are coupled to the power transmission and distribution networks for minimizing transmission and distribution line losses. The invention uses a novel control method of inverter based Distributed Generators as Static Synchronous Compensator (STATCOM) in a way that provides a dynamic voltage regulation/control with the inverter capacity remaining after real power generation, thereby decreasing system line losses.

The invention relates to a paper money temporary storage module and a reel rotating speed control method thereof. The paper money temporary storage module comprises a large reel driven by a first power motor, a small reel driven by a second power motor, a coiling tape, a first coded disc, a second coded disc, a first sensor, a second sensor and a microcontroller, wherein two ends of the coiling tape are respectively fixed on the large reel and the small reel and the coiling tape is retracted and wound between the large reel and the small reel; the first coded disc is fixed on a rotating shaft of the large reel; the second coded disc is fixed on a rotating shaft of the small reel; the first sensor is arranged corresponding to the first coded disc and is used for monitoring the rotating angle of the large reel; the second sensor is arranged corresponding to the second coded disc and is used for monitoring the rotating angle of the small reel; and the microcontroller is used for calculating the length of the coil tape released by the small reel when the large reel rotates for a circle according to output signals of the first sensor and the second sensor and further calculating the current radius of the large reel, and thus angular velocities of the large reel and the small reel are controlled and the linear velocity of the large reel is enabled to be consistent with that of the small reel.

The invention discloses a multi-stage magnetic field arc ion plating method for a lining positive bias straight pipe, and belongs to the technical field of material surface treatment. The problems that in a multi-stage magnetic field filtering device, pollution to the inner wall of a pipeline due to macroparticles needs to be removed, and losses are caused in the plasma transmitting process need to be solved. The method comprises the steps that firstly, a workpiece to be coated is arranged on a sample table in a vacuum chamber, and a related power source is powered on; and secondly, film deposition is conducted, when the vacuum degree in the vacuum chamber is smaller than 10-4Pa, work gas is guided in, the air pressure is adjusted, a coating power source is started, meanwhile, energy of plasmas is adjusted through a grid bias power supply, the macroparticle defect is further eliminated through a lining positive bias straight pipe device, the transmission efficiency of the arc plasmas is guaranteed through the lining positive bias straight pipe device, needed technology parameters are set, and film deposition is conducted.

When a step-up ratio control circuit sets a step-up ratio of a charge pump circuit to 1.0 to enable a short mode, a path inside the charge pump circuit is short-circuited and a first transistor is completely turned on. This produces an inrush current derived from a battery voltage of a lithium ion battery flowing into the charge pump circuit. To address this, a constant current circuit is operated so that the first transistor is turned on slowly. Further, the operation of an oscillator and an operational amplifier is suspended when the short mode is enabled.

A light guide plate including a first surface, a second surface, at least one light incident surface, and a plurality of groove sets is provided. The light incident surface connects the first surface and the second surface. The groove sets are separately disposed on the second surface. Each of the groove sets includes a plurality of curved grooves. Each of the curved grooves has a curved inclined reflective surface and a curved back-to-light surface connected thereto. The curved inclined reflective surface is inclined with respect to the first surface. The curved grooves of each of the groove sets curve toward the same curving direction. The curved inclined reflective surface of one of two adjacent curved grooves is connected to the curved back-to-light surface of the other one of the two adjacent curved grooves through a connection surface. A light source module is also provided.

The invention discloses a starting circuit for a high-voltage and wide-input range switching power supply. The starting circuit comprises a voltage-sharing part, a voltage stabilizing part, a current source part and an output circuit, wherein the voltage-sharing part consists of at least two stages of voltage-sharing circuits which are connected in series; the voltage stabilizing part is formed by connecting at least two stages of voltage stabilizing circuits in series; the current source part is formed by connecting at least two stages of current source circuits in series; an input source voltage is connected to the two ends of each of the voltage-sharing part and the voltage-stabilizing part which have the same stage; voltage-sharing points at which every two stages of voltage-sharing circuits are connected in series are connected with series-connection points of the voltage stabilizing circuits of the corresponding stages; the input end of the current source part is connected with the anode of the input source voltage; the control ends of each stage of current source circuits are connected with the voltage stabilizing output ends of the voltage stabilizing circuits of the corresponding stages; the output end of the current source part is connected with the input end of the output circuit; the output end of the output circuit is the output end of the starting circuit; after the input source voltage passes through the voltage-sharing part, shared voltages are output are input into each stage of current source circuits by the voltage stabilizing part to control the input source voltage sharing of each stage of current source circuits; or a switching-off circuit can be connected to switch the starting circuit off when the switching power supply works normally, so loss is reduced.

The invention relates to a step wave pulse width modulation method based on nonlinear programming. The step wave pulse width modulation method comprises the following steps of: correspondingly calculating the number of sub-modules in a part to be added or cut according to increase or decrease of a modulation degree so as to reach required alternating current voltage output; secondly, establishing a nonlinear programming mathematical model of the modulation method with a goal that the approximate error of a fundamental wave component in the step wave outputted by a current converter is minimum relative to a given modulation wave on the basis of a theoretically output step waveform Fourier transform result by selecting an initial value of a triggering angle; finally obtaining the solution of the triggering angle under a corresponding level number and modulation degree. The step wave pulse width modulation method based on the nonlinear programming, disclosed by the invention, overcomes defects of a specific sub-harmonic elimination method that calculation amount is huge and on-line real-time calculation cannot be carried out. A switch device is only switched on and off once in one cyclic wave, the remarkable advantage of small switching loss is achieved. The step wave pulse width modulation method based on the nonlinear programming, disclosed by the invention, has better expandability, can theoretically finish trigger impulse control tasks of voltage source current converters with any quantity of levels, has stronger transportability, is suitable for modularized multi-level converters and is also suitable for cascaded H-shaped bridge type voltage source current converters with a large quantity of levels.

A modular multilevel converter (MMC) circulating current suppression method is provided. The invention belongs to the technical field of electrical engineering, specifically relates to a suppression method for suppressing internal circulating current of an MMC, and solves problems of incompatibility with single phase and three phase systems, poor circulating current suppression capability and a complicated control method in conventional MMC circulating current suppression methods. According to the MMC circulating current suppression method, a wave trap is used for acquiring secondary harmonic signals in phase current; the harmonic signals in the phase current are subtracted from the average current of the phase current so that average current signals of an upper bridge arm and a lower bridge arm in which secondary harmonic waves are subtracted are acquired; the average current signals of an upper bridge arm and a lower bridge arm in which secondary harmonic waves are subtracted is taken to do subtraction with a reference current, and thus secondary harmonic signals of the circulating current is acquired; a proportional resonant controller is used for performing current tracing on the secondary harmonic waves of the circulating current, and thus voltage compensation signals are acquired; the compensation signals are processed and then are given back to sub-modules of the upper bridge arm of the MMC, and thus circulating current suppression is realized. The MMC circulating current suppression method is suitable for the technical field of electrical engineering.

A polymerizate slurry obtained through a reaction of an alkali sulfide source and an aromatic dihalide compound in an organic polar solvent and comprising polyarylene sulfide particles, a by-produced alkali metal salt and the polar organic solvent, is continuously contacted countercurrently with a washing liquid, thereby continuously and efficiently recovering washed polyarylene sulfide particles. Furthermore, the by-produced alkali metal salt is removed, and the polar organic solvent is recovered, efficiently.

The invention discloses a wireless internet block control method and a controller therefore based on multipath load balance and relates to the technical field of wireless communication. On the basis of a multipath scheme, an effective grouping transmission distribution strategy is carried out at a sending end to solve grouping disorder (Out-Of-Order, OOO) problems. Parameters are shared among different logistic layers. A multipath shunt strategy is combined, and the block judge of the parameter information of the network layers is combined. In multipath, the ordered grouping distributing strategy of data is guaranteed to enhance the TCP performance of the wireless internet. When a source node detects that a time clock is time out or repeated ACK is not roused by block, a TCP error control module controls a message segment sending module for resending messages. Otherwise, a TCP block control strategy and a block control strategy basing on the prepared path distributing and grouping are adopted for relieving the block. The wireless internet block control method and the controller therefore basing on multipath load balance can be widely applied to wireless Ad hoc network, wireless Mesh network, wireless sensor network, etc.

A continuously variable speed transmission includes a first guideway, a second guideway, wherein the first guideway and the second guideway remain stationary during operation at a particular speed ratio. The transmission further includes a first member moveably connected to the first guideway and the second guideway, the first member further comprising gear teeth and a second member having gear teeth positioned at an adjustable angle relative to the first member. A gear engages the gear teeth of the first member and the gear teeth of the second member. The speed ratio of the transmission is determined based on angle of the second member relative to the first member. Either of the first member or the second member may be the input with the other member being the output depending upon whether a speed increase or a speed decrease is desired.

The invention discloses a low-loss microstrip patch frequency scanning antenna array capable of scanning by a large angle in a limited bandwidth. The low-loss microstrip patch frequency scanning antenna array comprises an E-plane bend waveguide, a metal floor, a medium base plate, a waveguide gap microstrip patch mixed feeding structure and microstrip patch units, wherein one end of the E-plane bend waveguide is provided with a feeding port, and the other end of the E-plane bend waveguide is provided with a waveguide port which is connected with matched load; the metal floor is arranged on the E-plane bend waveguide; rectangular gaps are formed on the metal floor; the medium base plate is arranged on the metal floor; two rows of the microstrip patch units are arranged on the medium base plate; the number of each row of the microstrip patch units is as same as that of the gaps; all the microstrip patch units form the microstrip patch antenna array; a coupling microstrip patch is arranged on the medium base plate corresponding to each gap, on the medium base plate; microstrip transmission lines are symmetrically connected with the two sides of each coupling microstrip patch respectively; and the ports of the microstrip transmission lines are connected with the corresponding microstrip patch units respectively. The low-loss microstrip patch frequency scanning antenna array has the advantages of obviously reducing the loss of a frequency scanning slow wave line and improving the performance of the frequency scanning antenna.

The bullet wire cable and its production process features that medium carbon steel SWRH32A steel or 25#-55# steel is used as the material to produce bullet wire cable via surface treatment, drawing, normalizing heat treatment, zinc plating, re-drawing and twisting. The present invention has the features of less production steps, low power consumption, high production efficiency, etc.

Optoelectronic properties of optical communication LEDs, LDs and PDs should be examined in a wide range of temperatures between −40° C. and +85° C. Low temperature photocharacteristics of as-chip devices are tested by preparing an inspection stage cooled at a low temperature encapsulated in a shield casing with a front opening, conveying a chip of LD, LED or PD by a collet via the opening, placing the chip on the cold stage, blowing the stage and chip with cool dry air for preventing the chip from wetting, touching the chip by a probe, applying a current/voltage to the chip, examining emission/detection of the chip and taking the chip off via the opening by the collet.

The invention provides a control method for a variable frequency air conditioner. The control method includes the following steps of obtaining multiple target direct-current bus voltages according to the voltage of a direct-current bus in the variable frequency air conditioner, wherein each target direct-current bus voltage corresponds to one operating point; detecting the current voltage of the direct-current bus, carrying out PFC control so as to improve the current voltage of the direct current bus to the corresponding target direct-current bus voltage, carrying out field weakening control and vector control on a compressor according to the corresponding target direct-current bus voltage and the rotation speed instruction of the compressor of the variable frequency air conditioner, calculating the variable frequency efficiency, corresponding to each operating point, of the variable frequency air conditioner according to the running condition of the compressor so as to obtain the optimal variable frequency efficiency of the variable frequency air conditioner, and controlling the variable frequency air conditioner to operate according to the direct-current bus voltage corresponding to the optimal variable frequency efficiency. The control method for the variable frequency air conditioner is simple in algorithm, small in operation amount, capable of reducing operation losses and improving operating efficiency, and low in implementation cost.

A linear motor system that can extend the stroke of a linear motor, with power saving and at a low cost, is provided.

In a linear motor system, constituted by a linear motor 100, a controller 7 for supplying a variable voltage, a winding switching device 6, for opening and closing phase windings 5 of individual phases that form a plurality of winding groups 4 that are separated in a stroke direction, the winding switching device 6 is constituted by a three-phase rectifying member, a semiconductor switch, which is located at both ends on the direct-current output side of the three-phase rectifying member, and a resistor and a capacitor, connected in parallel to the semiconductor switch. For each of the phase windings, which form the plurality of winding groups 4, separated in the stroke direction, one end is connected to the output end of the controller 7 and the other end is connected to an alternating-current input side of the three-phase rectifying member of the winding switching device 6. And by opening or closing the semiconductor switch included in the winding switching device 6, of the plurality of winding groups 4 separated in the stroke direction, only a desired winding group 4 is excited.

The invention relates to a molten steel smelting technology for preventing nozzle clogging during sulfur-containing aluminium-containing steel pouring process. The molten steel smelting technology comprises the steps of converter or electric furnace steelmaking, LF steel ladle refining, VD or RH vacuum refining, and continuous steel casting. According to the molten steel smelting technology, molten iron without desulfuration is directly supplied to a converter or an electric furnace for steelmaking, and iron sulfide powder is added into slag in the later period of LF steel ladle refining, so that the content of sulfur elements in the slag is increased, the reaction between the molten steel and the slag is inhibited during the vacuum treatment process, the loss amount of S elements in the molten steel is decreased, Al2O3 inclusions and CaS inclusions which are liable to cause nozzle clogging are reduced, the problem of nozzle clogging can be eliminated, the production is guaranteed to be smoothly carried out, and the production cost is reduced.

The invention provides a method and system for continuous tracking a monitored object, aiming at solving the problems that the next adjacent monitored point can not be determined in time often in traditional monitoring when a real object is tracked to cause losing of the tracked real object. The method comprises the following steps of: selecting the calling direction of a camera according to the motion direction of the monitored object; automatically finding a camera which is closest to the current camera according to the calling direction of the camera; and calling the closest camera to monitor the monitored object continuously, and displaying monitored pictures in real time. With the method, the next adjacent monitored point can be automatically converted without need of remembering corresponding positions of hundreds of monitored points completely by monitoring staffs, thereby reducing the condition of losing of the tracked real object.

The invention relates to a digital soft switch inverter arc welding machine which is controlled by an embedded system. The digital soft switch inverter arc welding machine mainly solves the technical problems of the deficiencies on the control performances and the dynamic response aspect of the traditional welding machine, difficult realization of the real-time control of the welding arc and the improvement of the reliability of an inverter welding machine and so on. A main circuit is controlled by a control circuit to realize the arc welding, the pulse width modulation adopts a soft switch phase-shifting circuit; a pulse drive and protection circuit adopts a drive two magnetic tank type pulse transformer, a capacitor, a twisted-pair line, a TVS tube and a resistor are simultaneously added for continuous protection, thus preventing over-voltage and misconduction of IGBT which is caused by the over-voltage. The digital soft switch inverter arc welding machine is mainly used for various welding.

The invention discloses a high-voltage pulse power supply for a plasma sewage treatment system. The high-voltage pulse power supply comprises a power frequency rectifying and filtering circuit, a first-stage boosted circuit, a second-stage boosted circuit and a voltage coupling circuit. The power frequency rectifying and filtering circuit is connected with a municipal power grid to convert power frequency alternating current into direct current. An input end and an output end of the first-stage boosted circuit are respectively connected with an output end of the power frequency rectifying and filtering circuit and an input end of the second-stage boosted circuit to achieve the functions of boosting and rectifying and filtering. The second-stage boosted circuit is boosted again and outputs stable high-voltage direct current and stable high-voltage alternating current. The voltage coupling circuit couples and superimposes the alternating current and the direct current and loads the alternating current and the direct current to equivalent loads of a plasma reactor. According to the high-voltage pulse power supply for the plasma sewage treatment system, the traditional method that two independent alternating-current power supply and direct-current power supply are used for carrying out coupling discharging is changed, the number of needed hardware components is decreased to a great extent, space and cost are saved, loss is reduced, and reliability and stability of a power supply system are improved.

The invention discloses a micromechanical terahertz waveguide, a terahertz waveguide resonant cavity and a preparation method thereof, belonging to the technical field of spectrums. The micromechanical terahertz waveguide is a pipeline structure which is embedded in a package basal plate, and the package basal plate is formed by the stack of an upper surface plate, a lower surface plate and a plurality of middle basal plates; the waveguide device is arranged in the middle basal plates, and an axial line of the waveguide is parallel to the surface of the basal plate; the waveguide extends to the lateral outer surfaces of the middle basal plates, or the waveguide extends to the outer surfaces of the upper surface plate and the lower surface and is used for realizing signal input and signal output; and metals are coated on the inner wall of the waveguide. By utilizing the design principles of the THz waveguide, the terahertz waveguide resonant cavity can be prepared, and the preparation method is based on RF MEMS micromechanical technique and can be parallelized with large scale and processed with low cost.

The invention relates to a fully-enclosed automatic industrial component cleaning and oil sealing machine, and is characterized in that the machine comprises a cleaning bin, a main transmission system, a refrigeration system, an air passage drying reclaiming system, a liquid storage tank and a grease box, a filter, a distillation reclaiming system or a vacuum distillation reclaiming system, a carbon adsorption reclaiming system, as well as an ultrasonic generating device. The machine has the advantages that full-automatic control is realized, and the cleaning and the oil sealing are performed without the need of manpower, so that the labor intensity is reduced; the problems of easy flammability, insecurity and poor labor conditions caused by using gasoline, kerosene and alkaline solution as cleaning liquid are avoided; furthermore, the machine has the characteristics of an fully-enclosed structure and the vacuum distillation reclaiming system, thereby repeatedly utilizing a cleaning solvent, reducing the loss of the cleaning solvent, preventing people from direct contact with the cleaning solvent, and reducing environmental pollution and human body injuries; therefore, an organic solvent can be repeatedly used; meanwhile, the cyclic cleaning is performed by utilizing a combination of chemical force and various types of physical force, thereby enhancing the cleaning efficiency.

The invention relates to a balanced judgment and supplementary device of an energy transfer type battery pack and a method thereof, which are mainly used on occasions when numerous batteries are connected in series for use in industry. The device comprises balancing modules and a measurement and control module, wherein the balancing modules are connected in turns, are connected with each single battery, and charge the single battery by using the energy of the battery pack or the energy of an external power supply; the measurement and control module is connected with the battery pack and each single battery therein, and measures and compares the single battery. The method comprises the following steps of: measuring and controlling the total voltage of battery packs connected in series and the voltage of each single battery; calculating the average voltage of the batteries of the battery packs connected in series; sending starting/stopping signals; and making the voltage of the single battery approach to the average voltage of the battery packs. The device and the method have the advantages of having the function of ensuring the voltage balancing, which is performed in a mode of energy transfer, of the single batteries of the battery packs connected in series in use, having small losses, and being favorable to be applied to middle or large-capacity battery packs.