73results about How to "Overcome area" patented technology

The invention belongs to the technical field of electronic circuits, and particularly relates to a ripple compensation control circuit for a DC-DC converter. The benefit of the invention is that an internally integrated feedback ripple compensation circuit is designed to free a COT (constant on time) control system from the dependence on output capacitance ESR (equivalent series resistance) and to widen the optional range of output capacitance cells, thereby ensuring stable operation of the system. The on-chip ripple compensation technology is adopted to solve the problem that the traditional off chip compensation method has the disadvantages of complex structure and large occupied area, thereby reducing the total cost of a converter, expanding the applicable range of circuits, improving circuit accuracy and reducing circuit consumption. The invention is particularly suitable for a DC-DC converter.

The invention discloses an intelligent integrated control planting device which comprises a planting frame and a planting disk arranged on the planting frame, also comprises a power supply, an LED lighting lamp connected with the power supply, a low-pressure water pump and central control equipment; the LED lighting lamp is arranged the upper end of the planting frame or above the planting disk, the low-pressure water pump is arranged in a water supply system at the bottom of the planting frame and used for conveying water to the planting disk through a water pipe; and the central control equipment reads a correspondingly stored control data command according to different economic planting plants and centrally controls lighting frequency and time, temperature variation and watering quantity. By combining with accurate test planting parameters and through three-dimensionally planting plants in an intelligent integrated control and scientific efficient manner, the device disclosed by the invention greatly increases the output and meets the requirement for environmental protection.

The invention discloses a wireless charging, alignment and metal foreign body detection system of an electric automobile and a method thereof. The detection system comprises a transmitting coil, a receiving coil, a probe, a signal conditioning module and a control module connected with the signal conditioning module, wherein the transmitting coil is connected with the output end of a wireless charging and transmitting device on the ground surface of a parking lot, the receiving coil is connected with the input end of a wireless electric energy receiving device of an electric automobile chassis and is mutually coupled with the transmitting coil, and the probe is laid on the surface of the transmitting coil and is mutually coupled with the transmitting coil and the receiving coil. The probe is of an axis-symmetric structure and is composed of two coils equal in size and turn number and opposite in winding direction. The probe is consistent with the boundary of the transmitting coil in size. The signal conditioning module is used for receiving voltage signals output by two output ends of the probe and conducting amplification, filtration and peak-holding processing on the two signals output by the two output ends. The control module is used for obtaining the difference of the two received voltage signals and comparing the obtained voltage signal difference value with a preset voltage threshold value.

The invention provides an advanced oxidation-separate salt crystallization combination system and technique of high-salt-salt industrial wastewater, relating to the technical field of water treatment. The technique comprises the following steps: sending high-salt-salt industrial wastewater treated by a pretreatment membrane system into an ozone advanced oxidation device, and standing in the presence of an ozone catalyst at the ozone specific loss of 1.2-3.0 kg O3/kg COD (chemical oxygen demand) for 2-4 hours, wherein the COD of the treated effluent water is less than 50 mg/L; and sending into a crystallizing system to carry out crystallization treatment, wherein sodium sulfate concentrated water enters a refrigerating crystallizing system, and sodium chloride concentrated water enters a multi-effect evaporation (or MVR (mechanical vapor recompression) evaporation) device. The technique greatly lowers the wastewater COD content, increases the crystal salt purity, has the characteristics of simple operation, low cost, high water treatment quantity, high adaptability and stable water quality, and reduces the blockage problem of the crystallizing equipment.

The invention discloses a carbon composite material. The carbon composite material comprises 0.1-35wt% of a carbon nanomaterial and 99.9-65wt% of amorphous carbon with a high surface area; the carbon nanometer is one or a mixture of more of carbon nanotubes, carbon fibers, graphene oxide and graphene; and the specific surface area, the pore volume and the conductivity of the composite material are not lower than 800m<2>/g, not lower than 0.3cm<3> and not lower than 4S/cm respectively, and the aperture of the composite material is 0.5-10nm. The carbon composite material has the respective characteristics of the carbon nanomaterial and the amorphous carbon, realizes the organic combination of the carbon nanomaterial and the amorphous carbon in functions, has high surface area and high conductivity, and can provide superior capacity and rate performance as an excellent electrode and conductive material of super capacitors, lithium ion capacitors, fuel batteries and lead carbon battery electrodes. The carbon composite material can remove impurities in water as an electrode material in water treatment devices.

The invention discloses a continuous drawing production line of a strip product. The continuous drawing production line comprises an uncoiler, a straightener, a continuous drawing machine, a length measuring device and a cuttolength saw, as well as a stacking device for stacking the sawn product or a rolling machine for rolling up the sawn product, wherein the uncoiler, the straightener, the continuous drawing machine, the length measuring device and the cuttolength saw as well as the stacking device or the rolling machine are arranged in sequence. The continuous drawing production line provided by the invention has the advantages that the floor space is reduced, the damage and transformation of the products are avoided in hoisting, and the yield is improved. The invention also discloses a production method of the continuous drawing production line of the strip product. The production method comprises the steps of unfolding a pony roll blank to a straight line state, straightening the blank which is unfolded to the straight line state, carrying out continuous drawing processing on the straightened blank to form the product, measuring the length of the product according to the preinstalling length, sawing the product according to the preinstalling length, and stacking the sawn product or rolling up the sawn product. The production method of the continuous drawing production line provided by the invention has the advantages that the production efficiency and the yield are improved.

The invention discloses a self-calibration device and method for the loop parameters of a phase-locked loop. The self-calibration device comprises a phase frequency detector, a charge pump, a loop filter, a loop parameter correcting module and a main frequency divider. The phase frequency detector, the charge pump and the loop filter are sequentially connected. The loop parameter correcting module shares a common reference signal Fref input end with the phase frequency detector, and is connected to the loop filter. The main frequency divider is connected with the output end of the loop filter and passes through the main frequency detector to be fed back and input to the feedback input end of the phase frequency detector. The self-calibration device and method for the loop parameters of the phase-locked loop can overcome the defects that in the prior art, the area of a chip is large, manufacturing cost is high, and a temperature compensation effect is bad are overcome, and achieve the advantages of being small in chip area, low in manufacturing cost and good in temperature compensation effect.

The invention discloses a preparation method and application of a nitrogen-doped peel based porous carbon material. According to the method, waste peel is used as biomass raw materials; through an ultrasound method, the waste peel and a nitrogen source are pretreated; at low-temperature, the materials are pre-carbonized into nitrogen-doped peel based carbon; then, potassium bicarbonate is used asan activating agent for activation at high temperature; finally, through treatments of acid washing, water washing, drying and the like, the preparation of a nitrogen-doped peel based porous carbon super capacitor electrode material with high specific surface area, good pore diameter distribution and certain nitrogen content is realized. The prepared super capacitor material has excellent electrochemical performance which is shown in aspects of high specific capacitance, high energy density, good circulation stability and the like. In addition, the method does not relate to the use of strong basic or strong acidic or toxic activating agents; the preparation method is low in cost and achieves the environment-friendly effects.

A full-automatic paving system and an automatic identifying and reversing device thereof are disclosed. The full-automatic paving system comprises a feeding device connected with an external power source, a vibrating dispersing device and a conveying device. The conveying device is in transmission connection with the automatic identifying and reversing device, an operating and line distributing device, and a paving device used for discharging materials to the templates. The automatic identifying and reversing device is composed of a friction plate arranged inside a shell, a sliding guide board connected with the friction plate, an angle plate used to change the direction of the product. A second sliding guide board is arranged below the angle plate. The invention overcomes the defects in paving mosaics (or small-area building materials)by hands in the prior art and finishes the paving operation totally automated, thus reducing the work intensity of the workers and improving work efficiency by more than 90%. The whole system is reasonable in design and is strongly practical. The invention reduces the error in paving mosaics (or small-area building decorating materials) and is good in paving effect and reliable in quality. The invention realizes totally mechanized paving and greatly reduces cost; therefore the invention has broad market economic benefits.

The invention discloses organic hollow superfine fiber composite preparing and application. It adopts direct weaving or match-plate victim method to manufacture organic hollow superfine fiber with 15 nm-20 nm inside diameter and 50 nm-500 nm outside diameter. It can be applied to separating, protecting, antibacterial, catalyzing, sensing, decorating, structure support, biological consistent, conducting, repairing, and intelligence responding fields, and etc. It can greatly increase the material whole performance and reduce cost. It has the advantages of convenient manufacturing, low cost, and high quality price ratio.

The invention belongs to the technical field of medical ultrasonic diagnosis, in particular to an ultrasonic diagnosis system for cancellous bone based on backscattering signals. The ultrasonic diagnostic system includes a power module, an ultrasonic signal transceiver, a communication interface, and a data processing and display system. The power supply module provides multiple power supplies for the system; the ultrasonic signal transceiver equipment includes: a central controller, a transceiver integrated probe, a pulse excitation unit, etc.; the data processing and display system controls the ultrasonic signal transceiver equipment to collect Ultrasonic backscatter signal, calculate ultrasonic backscatter coefficient, apparent integral backscatter coefficient, spectrum centroid offset and average trabecular spacing and other parameters; establish a database of corresponding parameters, and give a diagnosis according to the corresponding diagnostic criteria for osteoporosis Report. The invention uses the backscattering method to diagnose the cancellous bone, which can not only detect the amount of the cancellous bone, but also better reflect the microstructure of the cancellous bone. The invention is light and portable, has low production cost, simple operation and no radiation damage.

The invention discloses a porous magnetic starch microsphere and a preparation method thereof. The method is characterized in that organic peroxide-surface modified Fe3O4 magnetic particle is used as a nucleus, mineral oil is used as a continuous phase, starch molecules and the magnetic nucleus are combined through reversed-phase polymerization reaction to form a magnetic starch micro sol particle with a nuclear-shell structure, the starch molecules on a shell layer are subjected to cross-linking reaction under the action of cross-linking agent-epoxy chloropropane, so that the magnetic starch micro sol is gelatinized to obtain magnetic starch micro gel, then the magnetic starch micro gel is subjected to demulsification, washing, magnetic separation, supercritical CO2 extraction and drying to obtain the porous magnetic starch microspheres. The porous magnetic starch microsphere is round, has uniform particle size, narrow pore size distribution, large specific surface and high mechanical strength, and the porous magnetic starch has a magnetic guiding function and a flexible and strong adsorption loading function, and has wide application prospect in the fields of sewage treatment, targeted drugs, catalytic industry, environment monitoring, immobilized enzymes and the like.

The invention discloses a gravity energy storage system of a hoisting and transporting system based on a mine vertical shaft. The gravity energy storage system comprises derrick hoisting sheaves, steel wire rope winches, electric power generation integrated machines and control systems. A derrick is located over the shaft mouth of a vertical shaft. The derrick hoisting sheaves are arranged on thederrick. A cage runs on a vertical shaft device cage guide and can move up and down along the vertical shaft device cage guide. The cage is connected with one ends of steel wire ropes, and the other ends of the steel wire ropes are wound around the steel wire rope winches. The steel wire rope winches are connected with the electric power generation integrated machines through mechanical transmission mechanisms. The electric power generation integrated machines are connected with a power grid through a transformer. Shaft mouth car operation devices and shaft bottom car operation devices are used for transferring and transporting mine cars onto a cage. The control systems are used for controlling the working conditions of the shaft mouth car operation devices, the shaft bottom car operationdevices and the electric power generation integrated machines. The gravity energy storage system is particularly suitable for reutilization of an abandoned mine vertical shaft and a mine about to dropout of use.

The invention relates to a fuel cell catalyst using a graphene/fullerene three-dimensional composite material as a carrier and preparation and application thereof. Under the protection of nitrogen, fullerene C60, sarcosine and paraformaldehyde are subjected to reflux reaction in methylbenzene to synthesize a fulleropyrrolidine derivative; ethanol solution of the synthesized fulleropyrrolidine derivative and aqueous solution of graphene oxide are subjected to mixing, standing and self-assembling to prepare a graphene oxide and fullerene three-dimensional self-assembly structure; and graphene oxide and metal ions are simultaneously reduced by utilizing hydrazine hydrate so as to obtain the catalyst using the graphene/fullerene three-dimensional composite material as the carrier. When performance of the prepared catalyst for carrying out catalysis and oxidation on methanol is tested by an electrochemical cyclic voltammetric method, obvious improvement on performance of the catalyst prepared by the invention is found. According to the invention, preparation is simple, rapid and convenient to operate; and the prepared catalyst is low in cost and good in catalytic performance and has potential application prospect in a direct methanol fuel cell.

The invention provides an Ag-TiO2 composite fiber preparation method. The Ag-TiO2 composite fiber preparation method includes the steps of adding silver nitrate absolute ethyl alcohol in a glacial acetic acid solution of tetrabutyl titanate by drops, mixing, adding polyvinylpyrrolidone, stirring and standing until all air bubbles disappear to obtain a polymeric pecursor solution; moving the polymeric pecursor solution in an injector, preparing a nanofiber precursor by means of electrostatic spinning, and baking in the air to obtain an Ag-TiO2 composite fiber. Size and shape of the Ag-TiO2 composite fiber can be controlled by means of adjusting spinning parameters and procedure parameters of electrostatic spinning. A photoelectric property of a material can be optimized by means of adjusting an Ag nanocrystalline deposit rate in the Ag-TiO2 composite fiber. Compared with a TiO2 photoelectric conversion material in the prior art, the Ag-TiO2 composite fiber preparation method has the advantages that the defects of small specific surface area, high photo-generated electron-hole compositing probability rate and low photo-generated carrier quantization efficiency of a TiO2 material are overcome, Ag nanocrystallines in the Ag-TiO2 composite fiber are highly adjustable, and the Ag-TiO2 composite fiber preparation method is simple and easy to repeat.

The invention discloses a wastewater concentrating system and method utilizing flue gas waste heat and based on liquid column evaporation. The system comprises an evaporation tower and is characterized in that the evaporation tower is arranged on one side of the gas inlet end of a desulfurization tower and communicated with the desulfurization tower; the evaporation tower is provided with a spraying area inside, the spraying area comprises a plurality of vertical liquid column spraying orifices used for spraying wastewater, flue gas enters the evaporation tower through the flue gas inlet of the evaporation tower and transfers heat and mass with the wastewater sprayed by the liquid column spraying orifices vertical to or intersecting with the flue gas, the wastewater evaporates after absorbing heat to generate steam which enters the flue gas, the flue gas flows out through the flue gas outlet of the evaporation tower and enters the desulfurization tower, the liquid column spraying orifices are connected with a wastewater storage tank, the evaporation tower is connected with the wastewater storage tank, and the evaporated wastewater enters the wastewater storage tank so as to achieve wastewater circulating concentration. The wastewater concentrating system has the advantages that flue gas waste heat is utilized on the basis that boiler efficiency loss is avoided, the problem of blocking is avoided, wastewater treatment quantity is lowered greatly, desulfurization water and water replenishing are reduced greatly, energy and water are saved, and huge economic and environmental benefits are produced.

The invention discloses a phase transfer catalyst for oxidative desulfurization of activated carbon supported heteropolyacid quaternary ammonium salt diesel and a preparation method of the phase transfer catalyst. The catalyst is prepared from an activated carbon carrier and a heteropolyacid quaternary ammonium salt active component, wherein the content of the heteropolyacid quaternary ammonium salt is 20-40% of the content of the activated carbon; the aperture of the catalyst is 1-2nm; the specific surface area of the catalyst is 500-700 m<2>/g. According to the invention, the activated carbon is taken as a support, and the heteropolyacid quaternary ammonium salt is taken as an active component, so as to prepare the phase transfer catalyst for oxidative desulfurization for the diesel, so that the defects that a non-supported phase transfer catalyst is fine in particles, low in specific surface area, and not easy to recycle are overcome. The heteropolyacid quaternary ammonium salt is supported on the activated carbon by adopting a two-step impregnation method. Firstly, heteropolyacid is supported to the activated carbon, and then reacts with the quaternary ammonium salt, so as to prepare the supported heteropolyacid quaternary ammonium salt phase transfer catalyst. The obtained catalyst is high in specific surface area; the active components are high in dispersity on the support, easy to separate and recycle, and less in oil loss. Thus, the diesel efficiency and the desulphurization rate are improved.

The invention discloses an ultra-low power consumption photoactivatable electronic tag and card reader system. The ultra-low power consumption photoactivatable electronic tag and card reader system consists of an ultra-low power consumption photoactivatable electronic tag and a card reader, wherein the electronic tag comprises a photodiode, a limiting amplifier, a passive high-pass filter, a signal comparator, a microprocessor A with microwatt power consumption and an LED, and the card reader comprises an optical receiver, a microprocessor B with microwatt power consumption, an LED driving circuit and an LED array. When the ultra-low power consumption photoactivatable electronic tag and card reader system works, a tag ID (identity) code to be queried is sent out by the LED array after the tag ID code to be queried is modulated by the card reader; when an optical signal emitted by the card reader is received by the electronic tag, the optical signal is amplified, conditioned and compared in the tag, and is subsequently judged by the microprocessor A with the microwatt power consumption on the electronic tag; when the query ID emitted by the card reader is different from the built-in ID of the tag, the tag does not respond; when the query ID emitted by the card reader is the same with the built-in ID of the tag, LED on the tag is lightened; and meanwhile, a signal can be sent to the card reader by the LED.

The invention provides a direct-pushing-type rapid drilling and sampling system for a polluted land mass. The direct-pushing-type rapid drilling and sampling system comprises a truck. A twist drill and an impact hammer are arranged on the truck. The truck comprises a gearbox connected with a takeoff, the takeoff is connected with a transmission mechanism, and the transmission mechanism controls the twist drill and the impact hammer to work. In a non-working state of the system, a working frame is retracted into a truck compartment body, the traveling speed is the normal traveling speed of a van truck, rapid conversion of working sites is achieved, the defects of low-speed traveling of a track-type drill rig and truck-loading site conversion are overcome, and the efficiency of investigationwork of a regional polluted site is effectively improved; and the working frame of the system is provided with the twist drill and the impact hammer simultaneously so that the demands of constructionof a groundwater monitoring well and direct-pushing-type undisturbed soil sampling work under different depth requirements can be met.

A horizontal garbage loading-compressing machine is composed of a garbage case, a loading mechanism with auxiliary garbage loading plate, a scraping-lifting mechanism with garbage scrapers, integral scraper and horizontal push plate, and a compressing mechanism.

The invention discloses an SNP molecular marker relating to the peach tree bleeding disease resistance. The SNP molecular marker which has close linkage with the peach tree bleeding disease resistance related QTL is obtained by locating a peach tree bleeding disease resistance gene locus, and is located on the sixth chromosome of a peach; the locus is SNP_IGA_627726; the SNP locus is obviously related to the morbidity of the bleeding disease of different types of peaches and is high in polymorphism; a novel authentication method is provided for parent selection in the early stage and generation selection in the late hybridization stage in a bleeding disease resistance species selection process; the accuracy of bleeding disease resistance detection can be improved, the breeding period can be shortened, the breeding efficiency is improved, and implementation of seed selection of a new bleeding disease resistance species of the peach tree in a high temperature and high humidity district is accelerated.

The invention discloses a water treatment device combining multiple physical methods. The water treatment device is characterized by comprising a water treatment unit (1), wherein the water treatment unit (1) comprises an ultrasonic, ultraviolet and ozone combined reactor (2) and a plasma generator (3), and a water outlet of the ultrasonic, ultraviolet and ozone combined reactor (2) is connected with a water inlet of a Y-shaped reactor (6) through a liquid pump (4) and a liquid flowmeter (5); the top end of the ultrasonic, ultraviolet and ozone combined reactor (2) is communicated with the plasma generator (3) through a second gas circulating pipeline (42). According to the water treatment device combining the multiple physical methods, sewage is treated by comprehensively utilizing methods of ultrasonic, ultraviolet, ozone, plasma, TiO2 catalysis and the like; besides, the problems of large occupied area, high energy consumption, long single treatment time, low utilization rate of active matters in plasma and the like of a wastewater treatment device in the prior art are further solved.

The invention discloses holocellulos composite aerogel and a preparation method thereof. Cellulose nano fibrils is added as a reinforcing phase in a conventional regenerated fiber aerogel preparationprocess, so that the problems that regenerated cellulose aerogel is high in density, low in specific surface area and liable to shrink in the preparation process can be solved. The preparation methodcomprises the following steps: firstly, dissolving cellulose by using a mixed system of an ionic liquid and a cosolvent; adding a cellulose nano fibrils/cosolvent suspension into the mixed system, performing uniform stirring, pouring the mixed system into a mold, further adding a regeneration solvent to form gel, performing washing by using the regeneration solvent so as to remove the ionic liquid, performing solvent exchange, and performing freeze drying or supercritical carbon dioxide, so as to obtain the aerogel. The holocellulos composite aerogel disclosed by the invention has a large specific surface area, good hydrophilcity, biocompatibility and biodegradability and stable chemical properties, and has wide application prospects in multiple fields such as biological medical materialssuch as wound repairing, antibacterial sterilization, cell culture, tissue engineering and medicine carriers.

The invention discloses a method for performing electrolytic treatment on high-concentration ammonia nitrogen wastewater by using three-dimensional electrodes. The method comprises the following steps: (1) treating the high-concentration ammonia nitrogen wastewater by using a three-dimensional electrode electrolysis device; (2) enabling effluent water treated by the three-dimensional electrode electrolysis device to enter a flocculation reaction tank, adding chemicals for flocculation reaction treatment, and adding sodium hydroxide to regulate the pH of the wastewater to 8-9, wherein the reaction treatment time is 10-30 minutes; (3) enabling effluent water after the flocculation reaction treatment to enter a vertical flow reaction sedimentation tank for sedimentation treatment, wherein the sedimentation reaction time is 60-180 minutes; (4) enabling effluent water after the sedimentation treatment to enter a clean water tank. According to the method, by virtue of characteristics of high electrolytic current efficiency, big specific surface area, strong oxidative degradation ability and the like of the three-dimensional electrodes, the purpose of simply, efficiently and rapidly degrading the high-concentration ammonia nitrogen is achieved, and the wastewater reaches the discharge standard.

The invention provides a high-strength continuous composite fiber mesh, a production method and a production line. The production line is characterized by comprising creels (2), a warp yarn paving machine (1), a weft yarn paving machine (10), a mesh mold (3), a glue supplying device (7), a baking oven (8) and a winding mechanism (9), wherein the warp yarn paving machine (1) and the weft yarn paving machine (10) are vertically arranged on the mesh mold (3) and alternately carry out composite fiber pavement for forming latticed composite fiber to be subjected to glue injection forming; yarns of the warp yarn paving machine (1) and the weft yarn paving machine (10) are respectively supplied by the respective creels (2); one end of the mesh mold (3) is provided with a material pressing glue removing roller (6); a heating device (5) is arranged in the mesh mold (3); a demoulding mechanism is arranged on the mesh mold (3); two cutting mechanisms are respectively arranged at the two sides of the mesh mold (3); and the baking oven (8) is arranged at an outlet end of the mesh mold (3). The production line has the advantages that the structure is simple, and the production efficiency is high.

The invention provides a visual testing device and method for soil and structure shearing characteristic research. The visual testing device comprises an upper shearing system, a lower shearing system, a horizontal force applying device and a data acquisition system. The upper shearing system is composed of transparent soil, a glass cylinder, an oil hydraulic system and an axial pressing system. An upper cover is arranged on the upper portion of the glass cylinder, and a loading rod and a loading plate are arranged between the axial pressing system and the transparent soil. The lower shearingsystem is composed of a rock-like or concrete-like material, a shearing box and a base. The horizontal force applying system is composed of a motor, a propelling worm and a horizontal displacement meter. A hand wheel applies horizontal push force to the base through the propelling worm, and liquid beads are arranged between an optical platform and a shearing box. The data acquisition system is composed of a laser, a CCD camera and a computer. By means of the visual testing device and method, the problem that contact surface stress and displacement are not visible during soil and structure shearing failures is solved, and the purpose of visual observation of the contact surface during soil and structure shearing failures is achieved.

The invention discloses a residual oil hydrodemetallization catalyst and a preparation method thereof. The method comprises the following steps: (1) impregnating an impregnation liquid I containing afirst active metal component in a physical pore-enlarging agent, and then drying to prepare a modified physical pore-enlarging agent; (2) mixing, kneading and molding the modified physical pore-enlarging agent obtained in the step (1), pseudo-boehmite and a second active metal component source, drying and roasting to obtain a modified aluminum oxide carrier SI; (3) immersing the modified alumina carrier SI obtained in the step (2) into an ammonium bicarbonate solution, then carrying out sealed heat treatment, and drying and roasting a material obtained through heat treatment to obtain a modified alumina carrier SII; and (4) impregnating the modified alumina carrier SII obtained in the step (3) with an impregnation liquid II containing a third active component, and carrying out drying and roasting so as to obtain the hydrodemetallization catalyst. The hydrodemetallization catalyst prepared by the method has high activity and activity stability when used as a heavy oil hydrodemetallization catalyst.

The application belongs to the technical field of mud treatment, and provides a mobile dehydration drying system for mud. The dehydration drying system adopts integrated and unitized design, an equipment facility is divided into a plurality of unit systems, each unit system equipment is integrated and improved, and the unit systems mainly include an impurity-removing concentration system, a curingagent delivery system, a homogenization stirring system, a press dehydration system, a tail-water treatment system and an automatic control system; and the unit systems are respectively integrated into a vehicle-mounted container, body and tower, and have the advantages of convenient transportation, a small floor space, and convenient disassembly and assembly. The system provided by the inventioncan quickly and deeply dehydrate and dry the mud, and has very strong adaptability for projects where a mud storage location is in a city center, a construction site area is small, and large-scale equipment cannot be installed.

The invention relates to a ripple compensation circuit based on a COT (constant on-time) mode buck converter, and belongs to the technical field of electronic circuits. The ripple compensation circuit has the advantages that by adopting a on-chip compensation technique, the potential information of a switch node SW of the buck converter is processed to produce alternating current ripple information being consistent with the inductive current in phase, and the alternating current ripple information is superposed to a feedback signal by a ripple compensation control circuit, so as to ensure that the output capacitive ripple with phase lag is weaker than the compensated ripple, and realize the stable working of the system; the problem of repeated design of parameters of the traditional off-chip ripple compensation circuit in different applications is solved, and the application range of the circuit is broadened.

The invention provides a method for treating wastewater containing nitrogen and phosphorus and synthesizing magnesium ammonium phosphate. The method comprises the following steps: adding seed crystalsinto a fluidized bed, and controlling the wastewater flow rate to enable the seed crystals to be fluidized; adjusting the pH value in the fluidized bed to an alkaline condition; adding magnesium liquid, starting reflux water, increasing the water temperature, and continuously introducing wastewater to enable the wastewater and the magnesium liquid to continuously react in the fluidized bed; reducing the water temperature, inserting the ultrasonic vibrating rod into the fluidized bed, turning on an ultrasonic vibrating rod, carrying out ultrasonic reaction, increasing the flow rate of backflowwater, turning off the ultrasonic vibrating rod, and carry out the reaction continuously; and after the reaction is finished, discharging the treated wastewater and the generated magnesium ammonium phosphate crystal precipitate. The crystal generated by the method is more regular in shape, short in reaction time and high in nitrogen and phosphorus removal rate, and the generated magnesium ammonium phosphate crystal is uniform and regular in particle size.