38results about How to "Easy to source" patented technology

The invention discloses an SBS (styrene-butadiene-styrene) modified regenerant. Components of the SBS modified regenerant include, in mass percent, 10-20% of SBS, 15-60% of 90A asphalt, 20-60% of extract oil, 4-20% of DOP (dioctyl-phthalate) and 0.05-0.3% of stabilizers. The invention further discloses a preparation method of the SBS modified regenerant and a method for regenerating the SBS modified asphalt by the aid of the SBS modified regenerant, and regenerative SBS modified asphalt is prepared. The SBS modified regenerant is made of raw materials easy to purchase, simple in process, convenient in production, fine in storage stability, stable in physical and chemical property and suitable for serving as a special regenerant for hot in-place recycling construction and hot recycling. Various indexes such as high-temperature stability, low-temperature crack resistance, elasticity and the like of the aged SBS modified asphalt can be obviously improved.

The invention discloses a hot-dipping aluminum-zinc alloy coated steel plate coating structure display method which incudes steps of a, grinding a test sample, placing the ground test sample into acetone or absolute ethyl alcohol immediately; b, polishing with alcohol as lubricant by procedures of polishing the test sample by a polishing disc at the rotational speed ranging from 900-1000rad / min with 2.5-micrometer polishing agent for 25-25 seconds, then polishing the test sample by a polishing disc at the rotational speed ranging from 600-750 rad / min with 1.0-micrometer polishing agents or 0.5-micrometer polishing agents for 10-20 seconds, and finally polishing the test sample by a polishing disc at the rotational speed ranging from 600-700 rad / min for 5-15 seconds without polishing agents; c, corroding by procedures of etching the polished test sample in a first corrosive agent for 5-9 seconds, wiping the test sample by a second corrosive agent with a cotton ball for 5-9 seconds, cleaning the test sample with the absolute ethyl alcohol, and blowing to dry the test sample to observe the test sample. The first corrosive agent comprises, by volume percent, 0.1-0.3% of hydrofluoric acid and the balance being water; and the second corrosive agent comprises, by volume percent, 75-85% of absolute ethyl alcohol and the balance being water.

The invention discloses a preparation method of a pantograph carbon slider, comprising the following steps: S1, grinding petroleum coke, pitch coke and modified asphalt into powder; S2, grinding the ground petroleum coke powder, pitch coke powder and The modified asphalt powder is mixed and kneaded into paste; S3, the kneaded paste is rolled out on the flake mill after it is out of the pot; S4, the rolled flakes are milled; S5, the milled powder is put into the pressing machine for heating Pressing; S6, the pressed molded product is roasted; S7, cooling is released, and the pantograph carbon slider is formed. The preparation method can manufacture a high-performance pantograph carbon slider, and the material procurement is easy, the dipping process is saved, and the beneficial effects of simple production operation, time saving, efficiency improvement, cost reduction and economic benefit improvement are achieved.

The invention discloses a method for mounting a prestress steel cylinder concrete pipe in a narrow space in a sleeve. The sleeve comprises an inner pipe and an outer pipe. The method comprises the following steps of: measuring at fixed points before construction; setting an axis, carrying out bulge test and grouting; fixing and laying steel rails in the outer pipe; placing a trolley for loading the inner pipe on the steel rails; jacking the trolley up at a specific position, and taking the trolley back; placing a three-way regulating device which regulates the inner pipe in the three-dimensional direction below the trolley; fixedly connecting a permanent steel gasket below the inner pipe after regulation; and carrying out bulge test and grouting seal at the junction of two inner pipes which are equipped with seal pieces, and mounting the inner pipes in the sleeve section by section sequentially until the finish of the construction. According to the the method, the prestress steel cylinder concrete pipe with the diameter of 2m is installed in the sleeve with the inner diameter of 3m, the sleeve is internally provided with two steel rails for loading the trolley, and the difficulty in the installation of the prestress steel cylinder concrete pipe in the sleeve is overcome; a jack and a winch are both minitype devices, the trolley is self-manufactured in field, the investment is less, and the cost is low; and the construction cycle is short, the proceed is rapid, and the mounting quality is good.

A commercial vehicle cab roof structure comprises a front roof, a middle roof and a rear roof. The front roof, the middle roof and the rear roof are connected in sequence, the rear roof is higher than the middle roof, the middle roof is higher than the front roof, a skylight opening is formed in the middle of the middle roof, the front roof is connected with the middle roof through a front lap-joint edge and an upper middle lap-joint edge, the middle roof is connected with the rear roof through a lower middle lap-joint edge and a rear lap-joint edge, the front lap-joint edge and the upper middle lap-joint edge are connected to form a flow guide groove, the lower middle lap-joint edge and the rear lap-joint edge are connected to form a flow guide groove, a plurality of middle reinforcement ribs are arranged at the positions, close to the left side edge and the right side edge, of the middle roof, and a plurality of rear reinforcement ribs are arranged at the positions, close to the left side edge and the right side edge, of the rear roof. The commercial vehicle cab roof structure is low in production cost and low in welding difficulty, rain is not prone to being leaked, wind resistance is small, and energy consumption is low.

The invention relates to an organic macromolecular composite material, in particular to a polyformaldehyde with improved toughness and a preparation method thereof. The polyformaldehyde is formed by the following components in percentage by weight: 60-80 percent of polyformaldehyde, 10-15 percent of glass fiber, 5-15 percent of impact modifier, 0.3-1.0 percent of antioxidant 1010, 0.3-1.0 percent of antioxidant 168, 0.4-1.0 percent of formaldehyde absorbent, 0.1-0.5 percent of coupling agent and 0.1-0.5 percent of other additives. In the toughened POM and the production process thereof of the invention, the raw materials for production are convenient to purchase; the production and the usage are convenient; the cost performance of the products is high; therefore, the condition that the toughened polyformaldehyde is limited to use for a variety of reasons is changed and the competitiveness of the toughened POM is fully enhanced.

The invention belongs to the technical field of fluorescent probes, and provides a fluorescent probe for quantitatively detecting the vitamin B12 based on a carbon quantum dot fluorescence quenching method as well as a preparation method and application thereof. Saccharose serves as a carbon source, ethidene diamine serves as a nitrogen source, concentrated phosphoric acid serves as a phosphorus source, PNCQDs is prepared through an acid-based neutralization heat releasing carbonization method, undissolved substance is removed through centrifugalization, unreacted precursor substance and micromolecules are removed through dialysis, and fluorescent probe PNCQDs solid powder is obtained through freeze-drying; and the linear relation between the vitamin B12 concentration and PNCQDs fluorescence intensity is determined by utilizing a fluorescence detection method. The content of the vitamin B12 in the practical sample is detected through a marking recycling experiment. The method is easy and convenient to operate, the anti-interference capability is high, expensive instrument and equipment are not needed, the detection cost is low, and the content of the vitamin B12 in the practical sample can be rapidly, efficiently and quantitatively detected.

The invention discloses a multifunctional vending machine which comprises a main control unit module, an input-output module connected with the main control unit module by signal, a payment module and a network communication module. The main control unit module is connected with a wide area network by the network communication module. The invention also provides a running method of the multifunctional vending machine, the user chooses goods and pays at the multifunctional vending machine, and subsequently, the operator sends the goods to the place appointed by the user. The invention also provides the other running method of the multifunctional vending machine, the user turns to the multifunctional vending machine, and the operator can know the position of the help seeker according to the position of the multifunctional vending machine. The invention connects the multifunctional vending machine with the network, not only provides the practical goods stored in the multifunctional vending machine, but also provides the order of the practical goods and the sale of service goods, thereby developing the application range of the vending machine greatly and also being convenient for the customer to purchase the goods.

The invention provides a chemical cleaning agent for alumina production pipeline scale, and relates to a chemical cleaning formulation applicable to multi-phase complex aluminum compound scale. The agent is characterized by comprising the following components in percentage by weight: 8 to 18 percent of hydrochloric acid, 6 to 8 percent of urotropine, 4 to 7 percent of thiourea, 2 to 5 percent of copper chloride, 0.01 to 0.02 percent of hydrogen fluoride, and the balance of water. The chemical cleaning agent for alumina production pipeline scale has the advantages of using the hydrochloric acid as a main solvent to dissolve main scale, using the urotropine, the thiourea and the copper chloride as corrosion inhibitors to prevent corrosion on equipment and using the hydrogen fluoride as surfactant to activate multi-phase complex aluminum compound scale substances difficult to dissolve, along with raw materials easy to purchase, few impact on equipment, thorough cleaning and good effects.

The invention discloses an environment-friendly biological texture etch solution and an application method thereof, particularly relates to application of the texture etch solution to a solar single wafer during processing and manufacturing of a solar silicon wafer, and belongs to the technical field of preparation of a monocrystalline silicon solar cell. The application method is characterized by comprising the following steps of: adding a non-ionic surfactant, sodium citrate, anhydrous sodium carbonate and deionized water into a cleaned texture etch groove, stirring, and mixing uniformly toprepare the environment-friendly biological texture etch solution; heating the environment-friendly biological texture etch solution to between 75 and 85 DEG C; placing cut monocrystalline silicon wafers in the environment-friendly biological texture etch solution for etching reaction after the temperature is completely stable, wherein the reaction time is between 10 and 30 minutes; and taking the silicon wafers out after texture etching, placing the silicon wafers in an ultrasound tank which is filled with the deionized water, and rinsing for 5 to 15 minutes by ultrasound. The texture surface with fine, uniform and high-coverage rate pyramids can be obtained after the solar single wafer is subjected to texture etching through the texture etch solution, and the mass difference of the wafer before etching and after etching is between 0.1 and 1.0g.

The invention discloses a preparation technique of p-hydroxy-cinnamic acid, which comprises the following steps: carrying out reaction on p-hydroxy-benzaldehyde, which serves as the main raw material, under the catalytic action of sodium methoxide by using ethyl acetate as a solvent, thereby implementing experimentation and production by a one-step process; and after the reaction finishes, recycling the ethyl acetate, and carrying out alkali dissolution and acid precipitation to obtain the finished product, wherein the product purity is higher than 99%, and the mol yield is higher than 90%.

The invention relates to a power module of a direct current electromagnetic brake, which mainly solves the technical problems that electric energy and raw materials are wasted and the motor failure is easy to appear, wherein, the technical problems exist when the direct-current electromagnetic brake adopts a single working voltage. The power module comprises a main return circuit and a control return circuit. A motor power is connected with a bridge rectifier circuit, and magnetic coils are connected to a direct current output end. A controllable silicon D2 control pole and a negative output end of the bridge rectifier circuit are connected with a relay normal open contact and a resistance R1 in parallel, wherein, the relay normal open contact is connected with the resistance R1 in series. Relay coils, a resistor R3, a resistor R4, a resistor R5, a resistor R6 and a diode D5 are connected in series one by one. A cathode of the relay coils is connected with an alternating current input end of the bridge rectifier circuit, and an anode of the diode D5 is connected with a positive output end of the bridge rectifier circuit. A capacitor C3 is connected between the cathode of the relay coils and the output end of the resistor R4 in parallel; a capacitor C2 and a resistor R7 are connected between the cathode of the relay coils and the output end of the resistor R4 in series; diodes D6, D7 and D8 are connected between the cathode of the relay coils and the output end of the resistor R4 in series. An extension line at the middle of the capacitor C2 and the resistor R7 is connected with a regulation tube D11, and then the extension line is connected with a basal pole of a dynatron. A collecting electrode is connected with the output end of the resistor R3, and an emitting electrode is connected with the cathode of the relay.

A process for preparing the nylon powder includes such steps as dissolving nylon resin in alcohol-type solvent, and pressure-type spray drying. Said solvent can be recovered for reuse.

The invention specifically relates to a rigid multiway displacement anticollision guardrail which comprises upright columns which are arranged at the two sides of a bridge expansion joint, wherein a plurality of telescopic horizontal rods which are arranged along the bridge direction are uniformly arranged between the upright columns at the two sides along the vertical direction at intervals, so as to be suitable for longitudinal displacement between bridge bodies, the two ends of each telescopic horizontal rod are respectively articulated to the upright columns at the two sides by adopting a pin shaft and a hoop sleeve system so as to be suitable for transverse displacement between the bridge bodies, and in addition, every two telescopic horizontal rods are welded through a vertical connecting rod to form a rigid frame-type integrated anticollision structure. The rigid multiway displacement anticollision guardrail has the advantages of strong guardrail anticollision capability, strong deformation capability, convenience in maintenance and change and good landscape efficiency.

The invention relates to a method for manufacturing an automobile sample mould by cement, which is used for automobiles and includes the following steps: a. a simple convex model is processed by using the traditional method and a wax sheet with the same thickness of a stamping plate material is pasted on the convex model; b. a concave model matrix is casted, a space about 30mm is reserved as the space for filling post cement; c. the upper surface and the lower surface of the casted concave model matrix is flat-processed to be parallel; d. the concave model matrix is placed on a platform, and the convex model pasted with the wax sheet is buckled on the concave model matrix so as to form an assembly by connection and fixing, and then the assembly is turned over; e. high-strong alumina cement is used for pouring; and f. the assembly is placed for a period of time, and after the solidification formation of the cement, the convex model is detached, the modeled surface of the cement is polished, and then a concave model body with the matrix of casting and modeled surface of cement is obtained The method shortens the manufacturing period of the mould and reduces costs of manufacturing and materials.

The invention relates to a culture medium and a culture method for producing gentamicin by virtue of micromonospora fermentation. The culture medium comprises a primary seed culture medium, a secondary seed culture medium and a fermentation culture medium. The culture medium is characterized in that the primary seed culture medium and the secondary seed culture medium comprise rice vinasse and low-temperature pressed soybean cake powder; the fermentation culture medium comprises the rice vinasse, the low-temperature pressed soybean cake powder, a weakly acidic cation-exchange resin and a non-ionic surface active agent. According to the culture medium disclosed by the invention, the problem of the costs of the raw materials and the auxiliaries is solved; in addition, the influence of the environment on the raw material and auxiliary sources can be reduced to the utmost extent, sufficient supply of the raw materials and the auxiliaries can be ensured, and stable and efficient production of the gentamicin can be realized; meanwhile, the culture medium and the culture method are capable of increasing the fermentation unit.

The invention relates to an active carbon-dynamic membrane two-stage compound technology which is used for municipal sewage treatment and recycling. The technology depends on two stages of reactors which are connected in series; each stage of the reactor is formed by compounding active carbon and a dynamic membrane and the difference between the two stages of reactors is that the grain diameters of the active carbon and the pore diameters of dynamic membrane base materials are different. In the first-stage reactor, the active carbon with the large grain diameter is added in one step; after theactive carbon is uniformly stirred and mixed with sewage, the mixture is filtered and separated through a dynamic membrane assembly, concentrated organic matters are intercepted and stable first-stage output water is generated; in the second-stage reactor, the active carbon with the small grain diameter is added in one step; after the active carbon is uniformly stirred and mixed with the first-stage output water, the mixture is filtered and separated through the dynamic membrane assembly; the output water is sucked and collected by a pump and enters a second-stage water production box; furthermore, the interception and recycling of the organic matters are strengthened and stable recycled water is generated. According to the active carbon-dynamic membrane two-stage compound technology, anactive carbon strengthened dynamic membrane filtering technology is utilized and effective concentration of the organic matters in the sewage can be realized; the recycled water suitable for afforesting, irrigating and the like is generated and the technology has the characteristics of occupied land saving, short flow, economical efficiency and high efficiency.

The invention relates to a travel-adjustable lifting type cold air and hot air adjustable skin drier, which comprises a frame. Guide tracks are respectively vertically arranged on two sides of the frame, the frame is provided with an air supplying mechanism and a lifting mechanism, the air supplying mechanism is used for delivering cold air and hot air, the lifting mechanism is used for leading the air supplying mechanism to move up and down, the air supplying mechanism controls delivery, wind power and temperature of the cold air and the hot air by the aid of an air supplying control module,and the lifting mechanism adjusts the travel of the air supplying mechanism via a lifting control module. The skin drier has functions of cold air and hot air adjustment, automatic back and forth lifting operation and the like. A user can set the lifting travel of the skin drier according to self needs; and the user does not need to use a bath towel to wipe the skin after taking a bath, the skin of the user is dry when the user leaves away from a bathroom after using the skin drier, and the travel-adjustable lifting type cold air and hot air adjustable skin drier not only can bring enjoyment for general people, but also brings convenience for special people.

The invention provides a self-locking anti-loosening hoop, which comprises a hoop body, a connector, a first elastic device, a second elastic device, an anti-loosening device and a support device, wherein one end of the connector is sleeved with the first end of the hoop body, the other end of the connector passes through the second end of the hoop body, and is matched with the first elastic device; a blind hole is formed in the connector; the hole wall of the blind hole is provided with a first strip-shaped through groove; the second elastic device is arranged in the blind hole; the anti-loosening device is accommodated in the first through groove; one end of the anti-loosening device is a free end, and is supported through the second elastic device in the blind hole, and the other end of the anti-loosening device extends into the blind hole and is supported at a set position in the blind hole through the support device; and the second end of the hoop body can be matched with the anti-loosening device. Due to the adoption of the self-locking anti-loosening hoop, the diameter of the hoop body can be used for automatically compensating the reduction in the thickness of an orifice wall, the hoop body is always jointed tightly with the outer wall surface of an orifice, single-direction locking is realized, and shrink torque is ensured effectively; and the self-locking anti-loosening hoop can be applied to occasions with high mechanical vibration to prevent orifice loosening caused by vibration.

The invention discloses a transformer substation data acquisition communication MODEM, used for communicating a data acquisition terminal with a master station and comprising a master controller, a modulation output circuit and an input demodulation circuit, wherein the modulation output circuit adopts a digital / analog conversion circuit to convert a modulation output signal into an analog signal for output; the input demodulation circuit adopts a comparator to convert an input modulation analog signal into a pulse signal to be sampled by the master controller and reduced into a standard serial port signal; and the invention further discloses a modulation-demodulation method adopted by the transformer substation data acquisition communication MODEM, which is used for completing modulation output, demodulation input and check bit self-adaption in a communication process. The transformer substation data acquisition communication MODEM disclosed by the invention completes the communication of the device by adopting a manner of combining hardware with software, which avoids the use of a special modem chip and an additional controller, so that the cost is lower, and the purchase is convenient; and the communication method is cured in the universal master controller, so that the modification and application are flexible, and the adaptability is wide.

The invention discloses a preparation method of Tadalafil compounds. In the synthetic method, the compound IV is obtained by two-step acylation reaction of a starting material D-tryptophan methyl ester hydrochloride with chloroacetyl chloride and 3,4-dyhydroxy-benzoyl chloride, the compound is obtained by cyclization reaction of the compound IV with phosphorus acyl halide, the compound VI is generated from the compound V via asymmetric hydride reaction and is then reacted with methylamine, and the final Tadalafil compounds are obtained through cyclization reaction of dibromomethane. With the method, use of heliotropin of state controlled chemicals is avoided, cis-type carbine intermediate is obtained by adopting asymmetric hydrogenation, and ee value is above 99%; the preparation method is simple in operation and synthetic reaction, moderate in reaction condition, high in purity and yield, and suitable for industrialized production.

The invention discloses a cement mortar grouting tank for prestress long anchor rope grouting and an application method. A tank body (1) is mounted on a bracket (2); a bottom outlet of the tank body (1) is connected with a mortar outlet pipe (3); an air intake pipe (4) and an exhaust pipe (10) are arranged at the upper side of the tank body (1); a control quick valve (5) is arranged on the air intake pipe (4); a safety valve (6) is arranged on the exhaust pipe (10); a pressure cover plate (8) is arranged in an upper opening of the tank body (1); a sealing ring (7) is added below the pressure cover plate (8); and the pressure cover plate (8) and the sealing ring (7) are fixed on the edge of the upper opening of the tank body (1) through fastening bolts (9). The cement mortar grouting tank is changed from an industrial oxygen bottle, adopts an air pressure type working principle to perform the all-angle deep hole grouting of cement mortar, is full in grouting, quick in speed, easy to operate, simple in equipment configuration, easy to be maintained and convenient for use, can realize the all-angle deep hole grouting, and in particular, is suitable for use under environments of complicated terrains or narrow spaces.

The invention discloses an ultralow speed small form pluggable (SFP) optical module. The optical module comprises an optical receiver, a comparator, a processor, a logical circuit, and an optical transmitter, wherein the optical receiver is connected with the comparator, the comparator is connected with the processor, the processor is connected with the logical circuit, the logical circuit is connected with the optical transmitter, and the processor, the comparator, and the logical circuit are all connected with an edge connector. The ultralow speed SFP optical module is applicable to power control and industrial control related ultralow speed signal transmission and photoelectric conversion devices, supports an I2C communication protocol, and supports a function of monitoring a voltage and temperature of the optical module and a power of a sending terminal.

The invention discloses a self-cleaning or self-degrading temporary plugging agent and a preparation method thereof. The self-cleaning or self-degrading temporary plugging agent is prepared from the following raw materials by weight: 40%-50% of polylactic acid, 25%-35% of a biodegradation agent, 2%-4% of glycerol, 4%-6% of polycaprolactone, 5%-7% of a thickening agent, 1%-3% of an alkaline solution and 0.1%-0.5% of a cross-linking agent, with the balance being water. According to the self-cleaning or self-degrading temporary plugging agent and the preparation method thereof, the temporary plugging agent can be degraded within 48 h, can absorb water to expand and crack at a formation temperature so as to realize loss of mechanical strength, and is finally degraded into water and carbon dioxide along with time increase; and the temporary plugging agent can be automatically degraded under a reservoir temperature condition, and can be automatically degraded after operation for high-water-content oil wells and water wells.

The invention discloses an intelligent transformer substation simulation switch, equipment and a method. The intelligent transformer substation simulation switch comprises a control loop and a direct-current power supply loop, a position output contact, an analog quantity control loop and a GOOSE and SV parsing loop which are connected with the control loop; the GOOSE and SV parsing loop is connected with a GOOSE receiving and sending optical port and an SV receiving optical port; the control loop is connected with a closing coil and a opening coil and used for controlling opening and closing of a three-phase switch in a manual mode or automatically controlling opening and closing of the three-phase switch according to received opening and closing commands of the analog quantity control loop and the GOOSE and SV parsing loop. The intelligent transformer substation simulation switch has the advantages that the intelligent optical ports and a switch operating mechanism are integrated, and therefore the intelligent simulation switch can directly control the three-phase switch in the manual mode and also can automatically control the three-phase switch through the control commands sent by the analog quantity control loop or the GOOSE and SV parsing loop.

The invention discloses a formula and method for treating polycyclic aromatic hydrocarbon polluted soil and application. The formula for treating the polycyclic aromatic hydrocarbon polluted soil comprises the following components in parts by weight: a KMnO4 solution with the content of 10wt% and water, the ratio of the mass of the KMnO4 solution to the mass of polycyclic aromatic hydrocarbon polluted soil to be treated is 0.8: 100-1.2: 100, and by the amount of the added water, it ensures that the water content of the polycyclic aromatic hydrocarbon polluted soil to be treated is 35-45%. According to the invention, conventional potassium permanganate is used as an oxidizing agent, and is convenient to purchase, configure and use, polycyclic aromatic hydrocarbon treated by the method is oxidized into other non-toxic substances, the method is an effective and environmentally friendly polycyclic aromatic hydrocarbon polluted soil treatment method, and compared with other methods, the method is better in effect.

The invention belongs to the field of material corrosion protection and discloses a high-throughput automatic corrosion resistance evaluation device capable of achieving in-situ measurement. The device includes: a high-throughput automatic hydrogen collection apparatus, a high-throughput electrochemical noise signal monitoring apparatus, and a high-throughput real time monitoring apparatus. The high-throughput automatic hydrogen collection apparatus includes a liquid displacement weighing structure and a buoyancy sensing structure; the high-throughput electrochemical noise signal monitoring apparatus includes a program controlled signal switching apparatus and an electrochemical work station that are connected through a wire, so that one electrochemical work station can monitor four groups, or an integral number times of four groups, of noise data simultaneously; the high-throughput real time monitoring apparatus includes a high-definition waterproof camera and a data process and control system. The units in the device are independent, so that the device is convenient to detach and clean. The device is humanized and is convenient to use and has accurate measurement result and goodrepeatability. Due to automatic counting, manpower and time consumption are greatly reduced, so that work efficiency is increased. The device has extensive application prospect.

The invention discloses a laser diode power supply structure. The structure is simple and is easy to realize. A current mode controller is used to generate high current totem pole output, and the totem pole output of the current mode controller drives a half-bridge driver to drive high and low side MOS tubes to achieve a purpose of adjusting a laser diode current. The current mode controller, thehalf-bridge driver, and the MOS tube are easy to purchase and cost is low. A high-side MOS tube and a low-side MOS tube are alternately conducted so that an energy storage inductor side forms an alternating voltage with an amplitude of Ui / 2. A duty cycle of a switch is changed so that an average value of an output voltage u can be changed and an output voltage Uo is also changed, and adjusting isconvenient.

The invention discloses a cleaning agent for oil stains on the surface of an artificial joint wax mold, and a treatment method, and belongs to the technical field of wax mold cleaning. The cleaning agent is formed by mixing a limonene solution with the mass concentration of 85%-95% and 2-thiophenyl ethanol with the mass concentration of 95% or above, wherein the volume ratio of the limonene solution to the 2-thiophenyl ethanol is 2-2.2:2.8-3. After the artificial joint wax mold is cleaned by using the cleaning agent and the treatment method provided by the invention, the surface of a wax pieceis free from oil stains, corrosion traces, rinsing by using clear water, harmful substances and harm to a human body, and waste liquid after cleaning can be recycled and reused for cleaning handwriting left after writing by using an oily pen.

The invention discloses a 131Cs particle used for inter-tissue close-range treatment of tumors and a preparation process thereof, belonging to the technical field if medical active particles. The 131Cs particle comprises a particle inner core and a particle shell, wherein the particle inner core is sealed in the particle shell, the particle inner core is a support rod internally and externally provided with uniformly distributed 131Cs, and the particle shell is a titanium pipe or titanium alloy pipe. The process comprises the following steps: adding a cesium nitrate-131 solution and a cesium nitrate solution into a solvent and carrying out uniform mixing under stirring, wherein the solvent is a volatile solvent miscible with water; adding an adsorbent as a supporter into a mixed solution obtained in the previous step and carrying out uniform mixing under stirring; removing the solvent and drying the supporter; grinding the supporter, adding a binder, carrying out uniform mixing and compressing the obtained mixture into the support rod with a diameter of 0.3 to 0.5 mm and a length of 2 to 5 mm; and finally, drying the support rod in the air and sealing the support rod in the medical high-purity titanium or titanium alloy pipe. The particle prepared in the process can be used for inter-tissue close-range treatment of tumors.