340results about How to "Destruction will not" patented technology

The invention relates to a load short-circuit protection circuit connected between a storage battery and a load circuit. The load short-circuit protection circuit comprises an MOS (Metal Oxide Semiconductor) tube protection circuit, a short-circuit detection circuit, a singlechip and an MOS tube switching circuit, wherein the MOS tube protection circuit is used for the reverse connection protection of the storage battery; the short-circuit detection circuit is used for detecting the short-circuit of the load circuit; the singlechip is used for sending out a switching signal according to a detection result of the short-circuit detection result; the MOS tube switching circuit is used for switching on or off the load circuit according to the switching signal; the short-circuit detection circuit comprises a comparer and a reference voltage generation circuit; the reference voltage generation circuit is connected to a first input end of the comparer; a source electrode of a first MOS tube of the MOS tube protection circuit is connected to a second input end of the comparer; and the output end of the comparer is connected to a first input end of the singlechip. The load short-circuit protection circuit is used for a load short-circuit protection circuit of a solar controller, has low cost, cannot increase the impedance of a load loop and has the function of eliminating instantaneoushigh voltage.

A remote network seal-affixing device able to automatically affix seal under the control of remote signal and with high safety is composed of a box consisting of upper cover, main body, hydraulic cylinder, interface and electromagnetic lock, a sealing moving unit, a sealing holder, a document bearing tray, a seal destroyer, a recognizer, a projector, a camera head, and a control circuit.

The invention provides a refrigerant applied to an automobile air conditioner for replacing HFC-134a. The refrigerant contains 2,3,3,3-tetrafluoropropylene (HFO-1234yf) and 1,1-difluoroethane (HFC-152a) or isobutane (HC-600a); a preparation method is achieved by physically mixing various components according to corresponding mixture ratio under liquid phase. The refrigerant is equivalent to the physical property of the HFC-134a, is compatible with pipelines and components of the prior HFC-134a system, has safe use, higher refrigeration efficiency and quite low slipping temperature, is free from damaging an atmospheric ozone layer and has quite low GPW value and shunt replacement fee. The refrigerant can be used as a replaced refrigerant of the HFC-134a of the automobile air conditioner.

The invention provides a refrigerant composition capable of being directly filled for replacing R22 in systems such as a household air conditioner / heat pump and the like. The refrigerant comprises pentafluoroethane (R125), 1,1,1,2- tetrafluoroethane (R134a) and dimethyl ether (DME or RE170); and the preparation method of the refrigerant comprises the following step of physically mixing all the components under a liquid phase in the corresponding proportions. The refrigerant completely meets the requirement of environment protection and has the ODP (Ozone Destruction Potential) value of zero and low GWP (Global Warming Potential) value; the thermodynamic engineering performance and the parameters of the refrigerant are very close to R22; the pressure and the exhausting temperature of a compressor are lower than those of R22; any parts and the lubricating oil of the traditional R22 system do not need to be changed or replaced when R22 is replaced with the refrigerant; the refrigerant can be filled directly and has good cycle performance same as or slightly higher than R22.

The invention discloses a method for identifying a variable boundary cable force of a medium or long cable. The method comprises the following steps of: performing unit discreteness on the cable, dividing the cable into n units (n is in a range of 40 to 400), and calculating a unit rigidity matrix [K]e and a mass matrix [M]e of each unit according to formulas (1) to (2); then arranging rubber cushion blocks on the cable to form external restraint, wherein the number of the rubber cushion blocks is 2 to 6 and the mounting number of the rubber cushion blocks is determined according to the length of the tested cable; and after the total rigidity matrix [K] and the total mass matrix [M] are determined, solving a characteristic value equation l[K]-omega2[M]l=0 of natural vibration frequency of a cable structure by adopting an iteration method to obtain the cable force T. Under the condition that the cable force is not changed, if the boundary condition of the cable is changed, the frequency of the cable is changed, and the equation of the frequency of the cable and the cable force is changed along with the change of the boundary condition of the cable, so the condition that the frequency of the cable cannot be tested under complex environments is solved, and meanwhile the frequency of the cable is in an interval capable of being tested by the conventional instrument by regulating the boundary condition.

The invention relates to the field of medical jurisprudence inspection, in particular to a diatom inspection method in medical jurisprudence. The method at least comprises the following steps: (1) microwave digestion: adding concentrated nitric acid and hydrogen peroxide solution into the inspected sample to carry out microwave digestion; (2) vacuum filtration: carrying out vacuum filtration on the digestion solution, adding ultrapure water, carrying out vacuum filtration continually until the surface of the filter membrane is approximately neutral, adding absolute ethyl alcohol, and carrying out vacuum filtration to remove moisture from the filter membrane; (3) a scanning electron microscope automatically takes pictures and stores the pictures; and (4) qualitative and quantitative analysis on diatom: carrying out inspection, classification and statistic treatment on the diatom in the on-spot pictures in an artificial identification way or computer automated identification way. The invention has the advantages of high detection sensitivity, high accuracy of qualitative and quantitative analysis, simpleness, high efficiency and environmental protection, can effectively avoid pollution, greatly improves the working environment for diatom inspection technicians in medical jurisprudence, and reduces the labor intensity, thereby having wide application prospects in drowning diagnosis practice in medical jurisprudence.

The invention relates to the technical field of aquaculture, and discloses an internal circulation fishpond and a circulating water treatment process. According to the internal circulation fishpond and the circulating water treatment process, an air striping device, a physical filtration device and a biological filtration device are arranged in vacant regions, such as corners of the fishponds; multiple functions, such as plug flow, oxygenation, degassing, solid filtration and biological filtration, are integrated in the design of the fishpond; through arranging an air stripping pump, a moving bed biofilter and a vertical flow precipitator and the like, the water treatment function of the fishpond is perfected and enhanced, and the fishpond has the functions of oxygenation, degassing, physical filtration and biological filtration; the circulating speed of a water body is reduced while the solid utilization rate is improved; through reducing the treatment load amount of a water treatment system, the circulating speed of the water body and the operating energy consumption of a circulating water pump are reduced.

The invention discloses a concrete filled steel tube row column shear wall with a structural steel support and a manufacturing method thereof. The shear wall comprises prefabricated concrete filled steel tubular columns arranged at certain intervals, structural steel supporting components, sleeve connecting components for connecting structural steel and concrete filled steel tubes, concrete poured into a wall space in a filling mode, and steel bar nets which are used for preventing early cracking of the concrete and arranged on two sides of a wall body in advance. The shear wall gives full play to the good axial compressive performance of the concrete filled steel tubular columns. The rigidity of the wall body is increased due to addition of the structural steel supporting components. A rubber pad layer is arranged in each sleeve connecting component, so that partial damage at the joints of the concrete filled steel tubular columns and the supporting components is reduced to a certain extent. Bulging of steel tubes is restrained due to the hooping function of sleeves to the concrete filled steel tubes, and the three layers of defenses including the concrete, the structural steel support and the concrete filled steel tubes are formed. The combined shear wall has high bearing capacity and a good anti-seismic property, most of the components are prefabricated components and are convenient to splice after being conveyed to a construction site, and work time is saved.

It relates to a binding track mounted flexible barrier crossing vehicle. It designs based on the crawling movement of worms, comprises binding track, flexible body and big power four wheel drive mechanism. Running forward, the binding crawler and flexible body coordinates with each other to realize the automatic adaptability to all kinds of ground defects of the body, to increase contact surface of the body and land, ensuring the friction to provide the forward force, flexibly crossing the barriers, especially those in 90 degree included angle of the side and the ground. It forms the walking part of intelligent combat vehicles for national defense, military attack, scientific probing and exploration, domestic tractor, toys, amusement and competition equipments.

The invention discloses an over-voltage over-current protector of electronic and electric equipment. The over-voltage over-current protector of the electronic and electric equipment comprises a power surge protective device SPD I, a surge voltage divider and a power frequency current protector, two ends of the power surge protective device SPDI are respectively connected with a live wire and a null line after a power supply distribution board access port and before a protected equipment port, the surge voltage divider is composed of an electric reactor A, a power surge protective device SPD II and an electric reactor B in a series mode, the electric reactor A at one end of the surge voltage divider is arranged on a live wire after the power surge protective device SPD I, the electric reactor B at the other end is arranged on a null line after the power surge protective device SPD I, and the power frequency current protector is composed of a PTC positive temperature coefficient thermistor, an NTC negative temperature coefficient thermistor and a TVS tube. The over-voltage over-current protector of the electronic and electric equipment has surge over-voltage limit and surge residual voltage division protection functions and power frequency over-voltage and over-current protection functions, enables the equipment fault rate to be reduced and enables the equipment aging speed to be lowered.

The present invention relates to a preparation method of a spherical nano silica-coated hexagonal boron nitride composite powder. The method comprises: dispersing micrometer h-BN powder in an absolute ethyl alcohol and adding distilled water and ammonia water, and then adjusting the pH value to 9-12, maintaining the temperature at 30-70 DEG C, dropwise adding tetraethoxysilane, and reacting to obtain a turbid liquid; centrifuging the turbid liquid, washing by absolute ethyl alcohol, drying in vacuum at 30-120 DEG C to obtain an h-BN@SiO2 composite powder material with micron h-BN as nuclear and nano SiO2 as the shell. The silica-coated hexagonal boron nitride composite powder prepared by the method has the advantage that the coating layer is intact and dense and tightly combined with coated particles and has high bonding strength; and the powder can be add to ceramic or metal matrix to improve the mechanical performance of material, without reducing the friction properties of the material.

The invention discloses an extraction process of rose essence for cigarette, falling into the technical field of essence and flavoring extraction technique. The extraction process includes pretreating olive oil; immersing; ultrasonically extracting; filtering; extracting; freezing and concentrating under reduced pressure; and performing molecular distillation. In the extraction process, rose oil in rose leaves can be fully dissolved in the olive oil to improve extraction yield; and the olive oil is extracted by anhydrous ethanol for multiple times before being used to reduce impurities in the rose oil, thereby reducing or eliminating residue in oral cavity resulting from lipoids in essence for cigarette.

The invention belongs to the field of the construction of civil architectures, and in particular relates to a method for mounting coolant pipes of an air conditioning system, which comprises: a first step of making preparations for the construction; a second step of machining copper pipes; a third step of braze-welding and connecting the copper pipes; a fourth step of laying the copper pipes; a fifth step of washing the copper pipes; a sixth step of performing airtight test; a seventh step of realizing the temperature preservation of a pipeline; an eighth step of vacuum-drying the pipeline system; a ninth step of supplementing a coolant; and a tenth step of performing pre-operation. In the invention, the copper pipes have the characteristics of bacteria growth inhibition, corrosion resistance, durability and long service life; and the method has the advantages of capacity of effectively improving a construction progress, relatively shorter construction period, and simple operation andconvenient maintenance because only a tube flaring kit, a pipe expander and a cutter are needed when the copper pipes are maintained, meets national requirements on energy-saving engineering and is favorable for promoting the research, development, integration and large-scale application of matching technology combining renewable energy sources and the architectures.

The invention discloses open channel type photocatalytic ultraviolet-disinfection equipment, which comprises an open channel, a plurality of groups of ultraviolet light tube modules, an electronic ballast module and a control system, wherein the ultraviolet light tube modules are suspended in the open channel; a maintenance crane is arranged on the open channel; a group of titanium dioxide photocatalysis modules is arranged between any two groups of ultraviolet light tube modules; each titanium dioxide photocatalysis module comprises a stainless steel frame; photocatalysis nets are arranged on the two lateral surfaces of the frame; photocatalysis spheres are sandwiched between the two layers of photocatalysis nets; the photocatalysis net consists of a stainless steel net and a superfine titanium dioxide coating covered on the stainless steel net; and the photocatalysis sphere consists of a stainless steel sphere and the superfine titanium dioxide coating covered on the stainless steel sphere. The open channel type photocatalytic ultraviolet-disinfection equipment applies many kinds of novel technology, such as ultraviolet disinfection technology, titanium dioxide photocatalytic disinfection technology and the like, to the disinfection open channel, and has the characteristics of good energy saving effect, broad disinfection spectrum, high disinfection efficiency, high working efficiency and the like.

The invention pertains to the field of power system microgrid protection and control, and relates to a microgrid non-destructive island detection method based on adaptive reactive disturbance. The method comprises the following steps: periodic reactive disturbance is added on the reference value of IBDG reactive output, the peak value selection of a triangular wave reactive disturbance portion is related to the IBDG operating mode and the system frequency when the reactive disturbance value is zero in the last disturbance period; and if the absolute value of the frequency change rate is detected to be equal to a preset value, and the duration time reaches a time setting value, then the island state is judged. The method of the invention is simple and practicable, and can be used to minimize the total disturbance and the influences of the disturbance on the quality of electric energy.

The invention discloses a preparation method for a gluten protein regenerated cellulose fiber. The method comprises the following steps: preparing a viscose spinning stock solution, preparing a gluten protein solution, preparing 8-12 percent by mass of a gluten flour solution, adding sodium hydroxide taking 4-10 percent by mass of the gluten flour solution and a dispersing agent taking 0.1 to 1 percent by mass of the gluten flour solution, stirring and reacting for 5 to 6 h at normal temperature, adding a cross-linking agent, reacting for 0.5 to 2 h at the normal temperature, obtaining the gluten protein solution after filtering, mixing the prepared gluten protein solution and the viscose spinning stock solution, and then performing wet spinning. The gluten protein regenerated cellulose fiber prepared through the method overcomes the problems of high production cost and difficulty in industrialization caused by high price of an auxiliary agent; by adopting an auxiliary agent with low price to perform protein pre-cross-linking, the loss of protein is avoided, and the protein content of the fiber is increased; and the method does not need a hydroformylation step, shortens the production technology process, and improves the production efficiency.

The invention belongs to the technical field of the manufacturing of a semiconductor device, in particular to a method for preparing high k-gate dielectrics on the surface of graphene by utilizing a water-based atomic layer deposition technology. The method comprises the following steps of providing a semiconductor substrate, wherein a graphene layer which is not functionalized is arranged on the semiconductor substrate; and adopting water / normal propyl alcohol mixed solution physically absorbed on surface of the graphene layer as oxidant to be reacted with a metal soruce to generate a high k-gate dielectric film under the condition of a reaction temperature. The high k-gate dielectric film is one of IIIA-group metal oxide, IIIB-group rare earth oxide and IVB-group transitional metal oxide and any one of binary or more than binary oxides of the IIIA-group metal, the IIIB-group rare earth and the IVB-group transitional metal. Compared with the prior art, the uniformity and the coverage rate of the high k-gate dielectric film which is deposited on the surface of the graphene can be remarkably improved, the structure of the graphene crystal is not damaged in the film deposition process, and the preparation of high-performance graphene device can be facilitated.

The invention provides a floated breakwater for utilizing wave energy, and the floated breakwater can provide a wave-breaking wave-preventing function within any range in any water area. The breakwater is characterized in that an efficient floated wave energy absorption device is taken as a unit to build the breakwater, so that the wave height of waves is greatly reduced after the waves pass through the novel breakwater, thus ships or other objects in the water area behind the device can avoid the waves. Arrays formed by a plurality of the devices can quickly build the breakwater within any range in any water area in accordance with demands. While the waves are broken, absorbed wave energy can be converted into other forms of energy. The breakwater is easy to build and construct, can be built massively on land, can be delivered to a targeted water area, can be put into use massively, is not influenced by sea state, marine geology and sea level in the construction process, can be predicted and controlled within the construction period and is wide in application aspects. In addition, the floated breakwater for utilizing the wave energy can be used for replacing a temporary cofferdam on sea.

The refrigerant composition for replacing R134a in automobile air conditioner consists of dimethyl ether DME or RE170, trifluoro iodo methane R13I1 and isobutene R600a; and is prepared through liquid phase mixing the said components in certain proportion physically. The present invention has environment friendship, zero ODP, GWP lower of 1-3, heat engineering performance similar to that of R134a and high efficiency. The refrigerant composition is used for replacing R134a in automobile air conditioner.

The invention relates to the field of agricultural machinery, in particular to a floating directional feeding type corn bionic threshing machine. The floating directional feeding type corn bionic threshing machine comprises a machine frame, wherein two differential rollers, a dispersing roller and a threshing roller are arranged on the machine frame; a dispersing area for destroying a corn particle integrated arrangement structure on corn ears and a threshing area for completely stripping the corn particles from the corn ears are formed between the dispersing roller and the threshing roller as well as the two differential rollers correspondingly; a feeding device which is used for conveying the corn ears to the dispersing area one by one along the axial direction between the two differential rollers is arranged on one side, provided with the dispersing area, of the machine frame; height floating adjusting devices are arranged between each of roller shafts of the dispersing roller and the threshing roller as well as the machine frame; and the height floating adjusting devices perform floating adjustment on the height of the dispersing roller and the height of the threshing roller according to the diameter difference of the corn ears which enter the dispersing area and the threshing area. The floating directional feeding type corn bionic threshing machine has the advantages of extremely low breakage rate, high threshing rate and avoidance of corncob breakage, and is suitable for subsequent processing after the corn ears are picked.

The invention relates to an ultrahigh-pressure extraction process of tricholoma matsutake polysaccharide. In the process, tricholoma matsutake is used as a raw material, and the active ingredient polysaccharide of tricholoma matsutake is extracted through the ultrahigh-pressure extraction process, so that a high-concentration raw material is provided to the medical application and healthcare of tricholoma matsutake; the tricholoma matsutake polysaccharide extracted by the process has obvious anti-tumor effects on enhancing immunity of an organism, inhibiting tumor cell proliferation, inducing tumor cell apoptosis and the like; moreover, the tricholoma matsutake polysaccharide also has a function of improving immunity, can be applied to the healthcare products and medicines for resisting tumor and improving immunity, and can be used as a food freshening agent or an additive of food, brewed wine, tobacco and cosmetics.

The invention relates to a hydrogen storage technology, in particular to a low-cost, high-hydrogen-absorption-and-desorption-speed and high-safety metal hydride hydrogen storage tank. The hydrogen storage tank mainly comprises a round foam metal cover, a gas pipe, a flange cover, bolts, an O-shaped sealing ring, cooling fins, a tank body, hydrogen storage material powder, a round foam metal barrel, a foam metal disc, a heat pipe and a foam metal cylinder. The metal hydride hydrogen storage tank is simple in structure and easy to realize, the condition that metal hydride powder flows out of thegas pipe with the gas flow to damage downstream components can be prevented, the hydrogen storage tank has the excellent heat and mass transfer performance, and thus the hydrogen storage tank has thehigh hydrogen absorption and desorption speeds. Besides, according to the hydrogen storage tank, damage to the tank body of the hydrogen storage tank due to self-compaction and hydrogen absorption expansion of the metal hydride powder can be avoided, so that the hydrogen storage tank is high in safety and can be used repeatedly.

The invention provides a refrigerant combination which can be directly filled to replace R22 in systems like domestic air-conditioners and heat pumps, and consists of pentafluoroethane(R125), 1,1,1,2-tetrafluorothane(R134a) and dimethylether(DME or RE170), the preparation method is that each component is done with physical mixture in liquid phase according to corresponding proportions, the refrigerant completely meets the requirements of environmental protection, the value of ODP is zero, the value of GWP is low, the thermal performance and parameters are rather near to R22, the pressure and the exhaust temperature of a compressor are lower than R22, the refrigerant can be directly filled without adjusting or exchanging any part or lubricating oil in present R22 systems, moreover, the cycle performance is similar to or slightly higher than R22.

The invention provides an antibacterial composite nanofiltration membrane. The antibacterial composite nanofiltration membrane comprises a porous support membrane bottom layer and an antibacterial surface layer complexed with antibacterial metal ions on the surface. The preparation method of the antibacterial composite nanofiltration membrane comprises the steps as follows: the bottom layer is impregnated with an aqueous phase solution containing aqueous phase monomers, and a bottom layer coated with the aqueous phase monomers is obtained; the bottom layer coated with the aqueous phase monomers is impregnated with an oil phase solution containing oil phase monomers, and a bottom layer coated with the aqueous phase monomers and the oil phase monomers is obtained; the bottom layer coated with the aqueous phase monomers and the oil phase monomers is subjected to thermal treatment, and a composite nanofiltration membrane with a polyamide functional layer is prepared; the composite nanofiltration membrane is impregnated with a metal salt solution containing antibacterial metal ions and the antibacterial composite nanofiltration membrane is obtained, wherein the aqueous phase monomers comprise polyethyleneimine. The antibacterial performance, particularly the microbial pollution resistance, of the antibacterial composite nanofiltration membrane is improved while the high permeabilityis kept; the antibacterial composite nanofiltration membrane has lasting antibacterial performance, long service life and good application prospects.

The invention provides an SAPO-34 / EU-1 composite molecular sieve. The SAPO-34 / EU-1 composite molecular sieve has the following two crystal forms at the same time: an EU-1 molecular sieve and an SAPO-34 molecular sieve. The synthetic method for the SAPO-34 / EU-1 composite molecular sieve provided by the invention comprises the following steps: adding the EU-1 molecular sieve into a glucose solution for ultrasonic treatment and carrying out filtering, drying and roasting so as to obtain a treated EU-1 molecular sieve; then mixing water, an alkali source, a template agent, an aluminum source and a silicon source with the treated EU-1 molecular sieve; and carrying out crystallization at a temperature of 150 to 240 DEG C for 15 to 100 h so as to obtain the SAPO-34 / EU-1 composite molecular sieve. According to the invention, glucose is introduced into the pores of the EU-1 molecular sieve and becomes carbon after roasting; the carbon occupies the pore channels of the EU-1 molecular sieve to prevent alkali from entering the interior of EU-1 molecular sieve crystals, so the EU-1 molecular sieve is not destroyed in the process of crystallization and the integrity of crystal structure is maintained, which are beneficial for improvement of the physical and chemical properties and the catalytic activity of the SAPO-34 / EU-1 composite molecular sieve.

The invention specifically discloses instant green tea and a preparation method thereof. The instant green tea is prepared from fresh tea leaves, and the preparation method comprises processing steps of breaking, extracting, filtering, concentrating, forming and drying, wherein the step of concentrating is realized by concentrating through a reverse osmosis membrane and implementing low-temperature vacuum concentration to obtain a concentrated solution which has 30-50% of solid content; in the step of forming, a blow molding process is adopted, and carbon dioxide gas is filled under high pressure to be coated in the tea concentrated solution; the step of drying adopts supercritical carbon dioxide drying; before breaking, the preparation method further comprises steps of high-temperature and high-pressure steam treatment and quick freezing, so that enzymes in the tea leaves are deactivated and GCG is generated, and therefore, oxidation resistance of the tea leaves is enhanced. Through the method disclosed by the invention, active ingredients in the tea leaves are completely extracted and preserved, and the active ingredients are prevented from being oxidized in the preparation process; meanwhile, the granulated green tea or sliced green tea is filled with carbon dioxide, so that taste and aroma in drinking of the instant green tea are improved.

The invention discloses a method for conversion, compression and transmission of images, comprising the following steps of: firstly converting an original image A into another image B which is the same as the original image A in size and is easier to compress; carrying out a conventional compression and coding as well as transmission on the image B at a sending end; after decompression and decoding at a receiving end, obtaining a restored image B; and then adopting nonlinear transformation based on a neural network for the image B to carry out mapping, and restoring the original image A. The method is suitable for compression and transmission of various images and has the advantages of simpleness in implementation, high compression ratio and information hiding.

The invention discloses superfine grinding technology of walnut dregs by a wet process, belonging to the technical field of agricultural products and food processing. The method comprises the process flows of coarse grinding of walnut dregs, mixture of coarsely ground powder of walnut dregs and water and superfine grinding by the wet process by a ball mill, etc. The temperature is not raised in the process of grinding; therefore, the nutrient components of the walnut dregs can not be damaged. In terms of kg / L, the ratio of coarse powder of walnut dregs to water is 1:(8-14). The parameters of the superfine grinding technology by the wet process by the ball mill are as follows: the ball-to-powder weight ratio is (1-6):10, the media are phi10mm zirconia balls, the milk grinding time is 30-120min and d50 of the walnut milk granule is 6-17mu m. The superfine grinding technology lays the foundation for subsequent preparation of walnut powder through spray drying and the application range of the superfine grinding technology in the food industry is broadened.

The invention discloses an exterior wall waterproof material, comprising liquid material and powder material. The weight ratio of the liquid material to the powder material is 1:(2-4); the liquid material is vinyl acetate-ethylene copolymer emulsion; the powder material is made with Portland cement, quartz sand, plasticizer and penetrant according to the weight ratio: (15-18):(20-24):1:1. The exterior wall waterproof material is both rigid and flexible and has the advantages of both the rigid material and the flexible material; added with various unique material compositions and active factors, the exterior wall waterproof material is excellent in waterproofing and impervious performances, is resistant to high and low temperatures, ageing resistant, high in weatherability, nontoxic and odorless and green, allows double waterproofing by single construction, is resistant to long-term soaking, and has certain anticorrosion effect; during construction, the exterior wall waterproof material is rarely destructed, water leakage rarely occurs even if a waterproof layer is destructed, water channeling or water leakage never occurs even if a base layer is severely damaged, a leak point is easy to locate, and local repairing is required only.

The invention discloses a file operation method of an embedded system. The method comprises the following steps: storing operational data to be read and written in the embedded system in the read / write partition of a Flash memory, setting the other partitions of the Flash memory as read-only partitions; copying a first file from the read-only partitions to the RAM, generating a second file in theRAM; reading operational data from the read / write partition, updating the second file with the operational data; and modifying the data in the second file according to the application requirement of the application program, and correspondingly updating the operational data in the read / write partition with the modified second file. The data which are needed to modify and the data which are not needed to modify are separated to store in a file manner respectively and only required data in the file are carried out on write operation, thus avoiding damaging the file system of the embedded device and increasing the file security of the embedded device.