391results about How to "Improve market competitiveness" patented technology

The invention discloses a preparation method for commercial vanadium battery electrolyte. According to the preparation method, vanadium electrolyte is prepared by one step through a chemical method; the preparation method comprises the following steps: dissolving raw materials containing vanadium by using an alkali; adjusting a pH (Potential of Hydrogen) value by acid-alkali regulation; repeatedly precipitating the vanadium to remove impurity elements; then roasting to obtain an oxide of the vanadium; finally, dissolving the oxide of the vanadium by using concentrated sulfuric acid to obtain the vanadium electrolyte. With the adoption of the method, impurities including iron, chrome, silicon, manganese and the like can be removed effectively and a process flow is shortened; the vanadium yield is improved, the impurity content is reduced and the process flow is shortened; the product purity can also be improved. The preparation method for the commercial vanadium battery electrolyte has important meanings on production technology levels and market competitiveness of the vanadium electrolyte; the method has good economic benefits and social benefits.

The invention discloses a third-party data service system based on Internet-of-Things data collecting. The third-party data service system comprises a data collecting cloud service module, a Web portal management module, a Web Service remote calling assembly module, a mobile application module and a data center management module. The data collecting cloud service module comprises a thread pool dispatching management module, a load optimization management module, a network management module, a data communication management module, a data storage module and an alarm module. The Web portal management module comprises a user and authority management module, an equipment management module, a monitoring point management module, a real-time monitoring module, a visual customization module, a spare part management module, an after-sale maintenance management module, a repair management module, a remote operation management module and a remote diagnosis module. The mobile application module comprises a real-time inquiry module, an alarm inquiry module, a repair registration module, a user feedback module, a maintenance inquiry module and a real-time warning module.

The invention discloses a processing method for biomass solid molding fuel, which pertains to the technical field of solid fuel and aims at solving problem of comprehensive use of energy and biomass energy in rural areas. The technical proposal is as follows: biomass energy such as crop straws, shrub forest, forestry residues and the like are used as raw materials, and the secondary crushing technique and the mixed technique combining continuous feeding with adjustable feeding are adopted, therefore, two types of solid fuels, namely, block-type and granular fuels, can be produced. The technical proposal comprises three stages namely, pre-treatment of raw materials, solid molding and auxiliary assorting, and the specific working procedures comprise raw material cracking, drying, conveying, mixing, feeding, molding, cutting, cooling and measuring and packaging and adding a compulsory ventilating dust-removing system during the whole process. The processing method for biomass solid molding fuel solves the problem of diversification of biomass raw materials, and the biomass solid fuel production line constructed by adopting the processing method realizes the industrial continuous and stable production, solves the problems of high energy consumption and low production efficiency in the existing small workshop-style production, and is also beneficial to solving the rural energy problem and improving the rural environment.

A large-sized monitored control System for the wind power generation plant on the sea, pertaining to the field of the computer application technology; this device consists of a data acquisition unit, a mono-computer monitoring data transmission unit, a mono-computer monitoring data processing unit, a multi-computer monitoring data transmission unit and a gross data processing unit. The data acquisition unit collects the technical parameter of the wind power plant; the mono-computer monitoring data transmission unit delivers the data of the data acquisition unit to the mono-computer monitoring data processing unit; the mono-computer monitoring data processing unit can process the data from the mono-computer monitoring data transmission unit; the multi-computer monitoring data transmission unit delivers the data processed by the mono-computer monitoring data processing unit to the gross data processing unit; the gross data processing unit can process the data from the multi-computer data transmission unit. The man-machine operating interface is introduced to send the control order to the mono-computer monitoring data processing unit as per the actual demand of the operation. This utility model is provided with a simple structure and a high practicability as well as lowers the manufacturing cost of the wind power plant.

The invention relates to a gateway for achieving the general adaptation function. The gateway comprises an Internet of Things gateway, a system platform and an interface configuration, wherein the system platform is used in cooperation with the Internet of Things gateway, and the interface configuration is arranged between the Internet of Things gateway and the system platform. The Internet of Things gateway comprises an interface module, an interface communication module, a device protocol analysis module, an interface communication mode configuration table, a configuration table control module and a wired / wireless transmission module. The system platform comprises a wired / wireless transmission module, an interface communication module, a device protocol analysis module, a protocol processing alarm module, a service processing module and a gateway interface communication mode configuration module. According to the technical scheme, the gateway for achieving the general adaptation function has the advantages that sensing devices with different protocols can have access to the Internet of Things gateway in a compatible mode, and great convenience is brought to customers; multi-protocol analysis management can be conveniently conducted, hardware and software in the gateway do not need to be changed, and compatibility and data analysis of unknown sensing devices can be achieved.

The present invention relates to an intelligent test device for a substrate, comprising a main case, a detection turntable, a feeding mechanism, a contact detection mechanism for testing the OFF-pressure of contacts from spring pieces, a discharging mechanism and an electric control box, the detection turntable, the feeding mechanism, the contact detection mechanism and the discharging mechanism being all ON-connected to the electric control box. The test device of the present invention can complete the OFF-pressure detection of the longitudinal and transverse contacts of the substrate automatically without requiring any manual operation, thus the test device of the present invention is easy to use, and the detection accuracy and the detection efficiency are high. Furthermore, the ex-factory pass rate of products is guaranteed, the cost is reduced and defective substrates can be classified and sorted automatically.

The invention relates to a smart factory management platform system comprising an intelligent sensing layer for collecting, arranging and storing data of all information sources during a production process, an intelligent data analysis layer for carrying real-time analyses on various collected data, monitoring, evaluating, and predicting healthy states of equipment and product quality states, displaying analysis results at a visual human-computer interaction interface, and generating corresponding decision-making support suggestions, and a management and decision-making layer for pushing the analysis results and decision-making suggestions to all departments under jurisdiction of a company and providing a decision-making and planning basis for a superior information system. According to the invention, historical and real-time monitoring data and production data are dug fully and health states of the equipment are analyzed and controlled precisely and quantitatively; a reasonable production plan and a reasonable maintenance plan are made based on the predictive analysis of the states of the equipment; failures of the equipment and products due to faults can be prevented; the operation and maintenance costs are lowered effectively; the production efficiency is improved; the product quality is guaranteed; and the comprehensive competitiveness of the market is strengthened.

The invention discloses a nanometer metal powder continuous producing device, comprising a vacuum measuring aerating system, a plasma / sensitive heating evaporating powder preparing system, a particle controlling system, a nanometer metal powder cyclone grading collecting system, a nanometer powder catching collecting system, a gas cooling circulating system, a water cooling circulating system, an electric controlling detecting system, a metal nanometer powder inactivating system and a powder vacuum packing storing system. The invention has high vacuum and three-gun structure, uses plasma constant-weight packing storing device, and plasma / electromagnetic sensitive evaporation or the like to realize continuous production of nanometer metal powder, change gas component and flux or the like.

The invention provides a base plate structure for an outdoor unit of an air conditioner, the outdoor unit of the air conditioner, the air conditioner and a defrosting control method for the air conditioner. The base plate structure for the outdoor unit of the air conditioner comprises an outdoor unit base plate, a base plate electric heating element and a drainage part, wherein a compressor fixing support is arranged on the outdoor unit base plate, and a condenser is installed on the outdoor unit base plate; the base plate electric heating element is arranged at the bottom of the condenser and located above the outdoor unit base plate; and the drainage part is arranged on the outdoor unit base plate and comprises at least one main drainage port, and the main drainage port is located below the base plate electric heating element. By adopting the base plate structure, when the air conditioner is heated for defrosting at a lower outdoor temperature, frost on the condenser and the outdoor unit base plate can be quickly and thoroughly thawed, and the thawed water quickly and smoothly flows out of the main drainage port, so the frost is thawed cleanly and thoroughly, the temperature of an indoor air port is improved, a good heating effect is guaranteed, and the market competitiveness of the product is improved.

The invention discloses a multi-standard mobile terminal. The mobile terminal comprises a baseband processor, a radio frequency front terminal transceiver, two transmitting terminal power amplifiers and a radio frequency switch, wherein the radio frequency switch is connected with an antenna; the radio frequency front terminal transceiver is respectively connected with the baseband processor and an antenna; and each transmitting terminal power amplifier is connected with the radio frequency front terminal transceiver. In addition, the invention also discloses the radio frequency front terminal transceiver with a radio frequency digital-to-analog conversion type linear transmitter. According to the mobile terminal and the radio frequency front terminal thereof with the radio frequency digital-to-analog conversion type linear transmitter, the production cost of the mobile terminal can be obviously reduced, the area of the whole chip of the mobile terminal is reduced, the strength of an output signal of a transmitter in the radio frequency front terminal transceiver can be improved, the overall performance and the market competitiveness are improved, and significant production practice significance is realized.

The invention discloses a method for preparing a coconut-water beverage. The method comprises the following steps: (1) breaking coconuts and then getting coconut water, adding an ascorbic acid the weight of which accounts for 0.1-0.15% of that of the coconut water into the coconut water, then stirring the obtained mixture so as to dissolve the ascorbic acid; (2) adding water into the solution obtained in the step (1), then stirring the obtained mixture, wherein the weight ratio of the water to the coconut water is (0.5-1.2): (4-5); (3) adding cane sugars into the aqueous solution obtained in the step (2), adjusting the sugar degree of the obtained mixture to 7.0-8.00 Brix, then adding a citric acid into the obtained product, and adjusting the pH value of the obtained mixture to 4.6-4.8; and (4) carrying out membrane filtration sterilization and ultrahigh-pressure low-temperature sterilization on the aqueous solution obtained in the step (3) so as to obtain the coconut-water beverage. The invention also discloses a coconut-water beverage. The coconut-water beverage and preparation method thereof disclosed by the invention have the advantages that because of changing the traditional heat treatment technology for sterilization and adopting the combination of low temperature membrane filtration sterilization and high pressure low temperature sterilization, the purposes of sterilization and refreshment are achieved, the unique flavor, nutrition and functional components of the coconut water are effectively kept, and the quality guarantee period of the prepared coconut-water beverage is long; and through filtering large particles in the coconut water through centrifugal filtration and membrane filtration, the prepared coconut-water beverage is clear, soft, delicate, pure and fresh.

The invention discloses a rapid long-acting humic acid multivariate fertilizer and a production method thereof. A long-acting part of the rapid long-acting humic acid multivariate fertilizer comprises raw materials of, by weight, 15-20% of urea, 5-10% of ammonium sulfate, 5-10% of ammonium chloride, 5-15% of monoammonium phosphate, 8-15% of calcium magnesium phosphate, 10-20% of potassium chloride or potassium sulfate, 10-15% of waste residues left from iron selection of pyrite smelting slag, 25-50% of humic acid, 5-25% of phosphogypsum and 5-12% of dolomite powder; A rapid part comprises rawmaterials of, by weight, humic acid urea prepared from 20-30% of urea and 40-50% of instant humic acid, 5-15% of monoammonium phosphate, 10-20% of potassium chloride or potassium sulfate, 0.5-1% of borax, 1-3% of zinc sulfate, 2-5% of magnesium sulfate, 0.2-1% of copper sulfate and 0.01-0.05% of ammonium molybdate.

The invention relates to boron microalloyed die steel and a preparation process thereof and belongs to the technical field of alloy steel preparation processes. The main alloy elements in alloy chemical components of the die steel comprise, by mass, 0-0.20% of C, 0-0.20% of Si, 1.20-1.60 of Mn, 1.10-1.50% of Cr, 0-0.30% of Ni, 0.20-0.35% of Mo, 0-0.10% of V, less than 0.015% of P, less than 0.005% of S, 0.005-0.01% of B, and the balance Fe. The preparation process of the steel includes the following steps of conducting burdening, smelting, casting and hot delivery; conducting high temperature diffusion heat treatment, multi-directional forging hot working and post-forging hydrogen diffusion tempering treatment; and finally conducting quenching-and-tempering heat treatment so as to obtain a tempered martensite structure with the hardness being 32-38 HRC. The boron microalloyed die steel and the preparation process thereof have the advantages that the prepared die steel has low cost, high hardenability, high hardness, high polishing performance and high skin grain etching performance.

The invention provides a novel container handling system, which comprises a shoreside container handling machine, a track movable relay conveyor, a fixed vertical lifting mechanism, a fixed trestle bridge and a storage yard container handling machine. The shoreside container handling machine is positioned at wharf at the front edge; the fixed vertical lifting mechanism is fixed in a door frame of the shoreside container handling machine; the track movable relay conveyor is positioned between the fixed trestle bridge and the shoreside container handling machine; and the fixed trestle bridge is positioned between the operation region of the relay conveyor and the operation region of the storage yard container handling machine. By the system, the operation efficiency of middle-small size harbors wharves can be improved; the relay links during transportation adopts a continuous conveyor, so the container handling system can normally work under server natural conditions; the construction cost of ports is saved; the conversion from traditional container truck transportation by adopting fuel power to the operation means of continuous conveyor driven by power is realized; the energy consumption is reduced; and the environment is protected. The first-line operating people are reduced; the safety of the whole system is improved; and the system is suitable for handling the container of middle-small sized harbors wharves.

The invention discloses a preparation method of a composite vegetable protein peptide. Soybean protein, walnut protein, sesame protein, wheat protein and corn protein are mixed according to a certainproportion to prepare a solution, and then enzymolysis is carried out to prepare the composite vegetable protein peptide. After enzymolysis, the vegetable proteins have different biological activities: the soybean peptide provides continuous nutritional power for heart cells and removes blood fat in cardiovascular blood vessels; the corn oligopeptide protects liver cells from being damaged; the wheat oligopeptide has good effect on spleen deficiency; the walnut peptide has the function of clearing lung; and the sesame peptide can nourish the kidney.

The invention discloses a software version upgrade management device and a method thereof. The device comprises a first version memory module and a second version memory module for storing a software version of a system, wherein the two memory modules are backed up with each other; a memory selection module for selecting either of the first version memory module and the second version memory module to participate the subsequent operation; a memory control module for controlling the memory selection module to select the first version and the second version memory modules; a read-write control module connected with the memory selection module and the memory control module for realizing data read and write operation; a version load module controlled by the read-write control module and downloading the required software version from the first or the second version memory modules; and a version information registering module connected with the memory control module and the read-write control module and used for storing an equipment number indicating the memory position of the current version and a status value indicating the version status. The invention replaces the single memory module with the version memory modules that are backed up with each other, and realizes technological advance of backup and backout of the system software version.

A high-flux detection system and the electrochemistry immune analytical method to detect many analytes at the same time has provided in the invention. It uses the functional chitosan membrane modified by the medium to fix the antigen molecule combining with the competitive immune analytical method, so the antigen in electrode surface competes with the antigen in sample to combine with the enzyme labeled antibody in warm cultivating solution to link the part antibody into the electrode surface, which catalyses the reaction between the H2O2 and the Toluidine Blue fixed in the electrode surface to get the detected antigen content in solution indirectly by the current catalyzed by the H2O2 oxidation. So the electrical medium is fixed in the electrode surface to avoid the signal cross generated by the diffusion which is the immune sensor array without disturbance. Combining with the flowing injection technology, it reaches the high-flux detection output. The sensor array is simple and cost little, also it has the short analyzing time and high sensitivity, so it is important to the life analytical chemistry, the immune science and the clinical medicine.

The invention provides a developer cartridge with a counting mechanism. The developer cartridge comprises a developer and the counting mechanism, wherein the counting mechanism is provided with protrusions which come in contact with a contact lever on an electronic photographing device so as to count the developer cartridge; and each protrusion has a first position and a second position in the direction perpendicular to a side wall of the developer cartridge, and is, in the first position, in contact with the contact lever, but is not, in the second position, in contact with the contact lever. The working principle of the developer cartridge adopting the counting mechanism is greatly different from the prior art. Therefore, the structure of the counting mechanism of the developer cartridge is simpler and more convenient and reliable; the production precision and the production cost are reduced; and the market competitiveness of the developer cartridge is improved.

The invention relates to a method for producing a magnesium alloy sheet, comprising the following steps: casting step: fused magnesium alloy which is added with grain refiner and has the solid phase with weight proportion between 10% and 15% is supplied between at least one pair of rollers, and a board with the thickness of 4.0-6.0mm is formed by continuous casting at the temperature that is 40-50 DEG C higher than the fusion temperature of the alloy; extruding step: the magnesium alloy board which is formed by continuous casting is further extruded into a wave-shaped magnesium board, and the extruded magnesium board has the thickness within the range of 2.0-3.5mm; flattening step: the wave-shaped magnesium board is rolled and unfolded to be a tabulate magnesium board; rolling step: the tabulate magnesium board is rolled to be the thinner magnesium alloy sheet with the width of 450-500mm and the thickness of 0.5-1.5mm; surface treatment step: surface coating is carried out on the magnesium alloy sheet to prevent oxidation corrosion. The thinner magnesium alloy sheet produced by the method can be applied to 3C products.

The invention discloses a preparation method of LCZ696 intermediate and relates to the technical field of preparation of an aromatic nucleus compound containing 2 benzene rings and 1 chiral center. The preparation method includes the steps of S1, allowing benzyl magnesium bromide to react with methyl oxalyl chloride to obtain a compound as shown in formula I; S2, allowing the compound as shown in formula I to have a bromination reaction with a bromination reagent to generate a compound as shown in formula II; S3, coupling the compound as shown in formula II with phenylboronic acid to obtain a compound as shown in formula III; S4, performing reductive ammoniation on the compound as shown in formula III to obtain a compound as shown in formula IV; S5, applying Boc to the compound as shown in formula IV to obtain a compound as shown in formula V; S6, performing ester group reduction on the compound as shown in formula V to obtain a compound as shown in formula VI. The preparation method has the advantages that overall raw material consumption is lowered, and product productivity and market competiveness are increased; by the overall process optimization, the reaction of each step can be performed and controlled easily, the use of heavy metal catalysts is reduced and avoided, and accordingly the quality index of the final product is increased, and an economic and environment-friendly process route is developed.

The invention relates to a reduced-type polycarboxylic acid water reducer and a preparation method thereof. An esterification method is employed for synthesizing a reduced monomer having a low surfacetension, and the reduced polycarboxylic acid water reducer is prepared through polymerization; acid anhydride or unsaturated carboxylic acid and ethers molecules are subjected to an esterification reaction to prepare the reduced monomer under effect of a catalyst, and then the reduced monomer, nonsaturated polyoxyethylene ether, unsaturated carboxylic acid or a mixture of unsaturated carboxylic acid or its acid anhydride, and a molecular weight conditioning agent are subjected to a free radical copolymerization reaction under effect of an initiator. The method has the advantages of easy control, high yield, low cost, environmental protection, and no pollution. During a polymerization process, a reduced group is introduced, so that the water reducer has low surface tension, an anchoring group is introduced, has good cement slurry-cleaning fluidity under common doping, reduces the surface tension force of a cement aperture solution, and reduces evaporation rate of the solution so as toeffectively reduce the mortar contraction. The obtained water reducer presents good water-reducing and reduction characteristic.

The invention discloses a low-cost continuous casting billet produced large-thickness steel plate for low-temperature pressure vessel and a production method thereof. The steel plate comprises the following chemical components in percentage by mass: 0.05-0.10% of C, 0.20-0.50% of Si, 1.30-1.60% of Mn, less than or equal to 0.012% of P, less than or equal to 0.005% of S, 0.020-0.050% of Alt, less than or equal to 0.70% of Ni, less than or equal to 0.040% of Nb, and the balance of Fe and inevitable impurities. The production method specifically comprises the procedures of smelting, casting, heating, rolling, and heat treatment. According to the present invention, with reasonable composition design and the production process of controlled rolling and controlled cooling, and heat treatment, and by completely using continuous casting billets for production, the maximum thickness of the steel plate reaches up to 120 mm; the produced steel plate has favorable comprehensive mechanical properties and welding properties, and is low in production cost and high in market competitiveness, thus meeting the increasing market demand.

A motor magnet fixing device includes two press rings, a plurality of magnets and locking members. A least one of the two press rings has its annular surface disposed with a plurality of projecting members spaced apart equidistantly. Each projecting member is axially bored with a fixing hole, having its opposite sides respectively formed with an engage recess. The magnets are clamped between the two press rings and respectively engaged between the adjacent projecting members of the two press rings. Each magnet has its opposite ends respectively formed with an engage projection to be engaged in the engage recesses of the projecting members of the press rings. The locking members are respectively inserted in the fixing holes of the projecting members of the press rings to combine the press rings together and fix the magnets between the press rings.

A production process of preparing high-quality potassium chloride from carnallite includes the steps of 1) crushing carnallite ore; 2) adding the crushed carnallite ore to a decomposition crystallizer filled with saturated mother liquid; 3) adding fresh water or a washing mother liquid obtained in subsequent processes into the decomposition crystallizer; 4) stirring the slurry so that a quasi-closed loop circulation flowing status that the ore slurry flows from bottom to top in a flow guide cylinder and flows from top to bottom in an annular chamber being adjacent to the external side of the flow guide cylinder is formed, and during the flowing process, the carnallite is decomposed and the potassium chloride is crystallized; and 5) sieving a bottom flow in the decomposition crystallizer, wherein the oversize substance serves as tailings while the undersize substance is filtered then; and 6) feeding a filtrate to the next process to perform evaporation crystallization to recycle the KCl, and washing, filtering and drying a filter cake. The production process is simple, is low in mechanical loss and energy consumption, is low in production cost, is free of any chemical reagents and is environment-friendly. The potassium chloride product has good quality and large granularity.

The invention provides a production method of sprouting brown rice nutritious biscuit. Sprouting brown rice is dipped, ground into pulp through a pulping machine, dehydrated, mixed and then steamed into powder. The powder is cooled, dried and then made into sprouting brown rice powder. The sprouting brown rice powder and flour are stirred in a stirring mill. Sugar, oil, powder lot and the like are added and mixed evenly. Pastes are rolled, processed, molded and roasted. Oil is sprayed on the pastes and then the pastes are cooled and packed. The sprouting brown rice serves as main raw material and is mixed with the flour, which realizes nutrition complementation and the produced biscuit contains rich dietary fiber, vitamins and a plurality of trace elements. The biscuit has the advantages of good taste and convenience and is suitable for old and young. The invention develops a new approach of producing nutritious healthy food with the sprouting brown rice.

The invention discloses an intelligent terminal which comprises a front shell assembly, a display screen assembly and a touch screen. The middle of the front shell assembly caves to form a frame structure. The lower surface of the display screen assembly is pasted into the front shell assembly. The two sides of the display screen assembly are pasted to the inner surface of the left side wall and the inner surface of the right side wall of the front shell assembly. The display screen assembly and the touch screen are pasted in a full attaching mode. According to the intelligent terminal, gluing steps on the left side and the right side of the intelligent terminal are eliminated, the reliability of the installation strength of the product can be guaranteed, and the experience level and the market competitiveness of the product are improved.

The invention discloses a preparation method of environment-friendly type three-prevention automobile needling finishing material, which comprises the following steps: firstly, cleaning blankets, namely placing automobile finishing base blankets into dissolvent to clean for a certain period, flushing by deionized water, and drying for stand-by, secondly, low-temperature plasma treatment, namely placing automobile finishing base blankets after cleaning in a low-temperature plasma treatment instrument to conduct electro discharge treatment, improving the reactivity of subsequent finishing agent and materials, and improving durability, thirdly, slop padding method treatment, namely, immersing automobile finishing base blankets after plasma treatment into fluorine-containing organic finishing agent solution to conduct two-leaching and two-rolling treatment, conducting baking and thermal treatment in a baking box, and preparing to get environment-friendly type three-prevention automobile needling finishing material. The automobile needling finishing material is a clean and environemt-friendly vehicle-used textile material with 'three-prevention' functions of preventing water, oil and sewage.

The invention provides an intelligent configuration method for automobile generalized products. The method includes the steps that firstly, an automobile generalized product model is established, wherein an automobile generalized product reference library, a constraint relation library and configuration options are set; secondly, customer demands are mapped to a configuration scheme, wherein two processes including selection of an automobile generalized product reference type and selection of configurable options are included, in the process of selection of the automobile generalized product reference type, a trained knowledge based artificial neural network (KBANN) is utilized, the extracted customer demands serve as input, and the automobile generalized product reference type is obtained, and in the process of selection of the configurable options, configurable option parameters are selected based on the selected reference type, and an automobile generalized product configuration BOM meeting the customer demands is obtained; thirdly, consistency check is conducted on the configuration scheme; fourthly, after consistency check passes, the configuration scheme is generated, and a scheme explanation document is formulated; fifthly, customer configuration data is stored, and a KBANN structure and a configuration rule are updated. The intelligent configuration method has practical value in the field of configuration of the automobile generalized products.

The invention provides a muffler transmission loss testing system and a muffler transmission loss testing method for aiming at aerodynamic noise, and particularly relates to a system and a method for testing aerodynamic noise muffling capability of an automotive intake / exhaust muffler. The muffler transmission loss testing system comprises a variable-frequency centrifugal fan, a fan noise muffler, an air flow sensor, an air pressure sensor, a standing wave tube, a microphone set, an electronic air pressure relief valve, a pressure relief valve muffler, an analog / digital conversion board, a gain amplifier and a computer. The muffler transmission loss testing method comprises the steps of fixing a to-be-tested muffler on a table; starting the testing system and performing initialization setting on the testing system; monitoring an air flow and pressure in the standing wave tube; controlling the fan and the pressure relief valve for sustaining the flow and the pressure in the system; testing a sound pressure value at a corresponding position in the standing wave tube; calculating the transmission loss; and outputting a result. The muffler transmission loss testing system and the muffler transmission loss testing method have advantages of simple structure, convenient operation and high accuracy. The muffler transmission loss testing system and the muffler transmission loss testing method fill in gaps in testing the aerodynamic noise transmission loss of the automotive intake / exhaust system.

The invention discloses a PP / PA (polypropylene / polyamide) composite material and a preparation method thereof. The PP / PA composite material consists of the following components in percentage by weight: 40-48% of PP resin, 29-49% of PA resin, 2-6% of flexibilizer, 8-16% of compatilizer, 0.5% of lubricant and 0.3% of antioxidant. In the invention, the polypropylene and the polyamide are blended and modified; a prepared blended alloy material has the specific performances of the polypropylene and the polyamide; the notch impact strength of the polyamide is improved greatly; the applied range is enlarged; the market competitiveness is enhanced; and the production cost of a product is decreased.