172results about How to "Give full play to the characteristics" patented technology

The invention belongs to the technical field of electronics, and relates to an LED (light emitting diode) street lamp driving circuit capable of regulating output illuminance automatically. The driving circuit comprises an input surge protection and electromagnetic interference suppression circuit, a single-tube flyback switch power circuit with a power factor correction function, an environment illuminance detection circuit, a chip temperature detection circuit, a perpetual calendar chip, the periphery circuit of the calendar chip and an output current automatic regulation switch circuit controlled by a microcomputer; a dual-control working mode with the primary light control and auxiliary time control by the microcomputer for a general switch control module provided by the invention; and when the primary control is out of control, the auxiliary control replaces working automatically, and the light control according to the set illuminance controls the starting and closing operation of the street lamp. The driving circuit provided by the invention has the advantages of power factor correction, can regulate the output current automatically according to time, the environment illuminance and the LED chip temperature, can control the luminosity to regulate the output current directly as the control mode, and compared with the traditional low-frequency PWM (pulse width modulation) control method, the electromagnetic interference is less, and is more friendly to human eyes.

The invention discloses a method for modifying a nano metal oxide by coupling graft, and belongs to the technical field of nano granule surface modification. The nano metal oxide is used as a raw material, N,N'-carbonyl diimidazole (CDI) is used as an activating agent, and a finished product is obtained by simple processes of drying treatment, coupling reaction, separation and purification, coupling graft, re-separation and re-purification. The method has the advantages of simplicity, mild reaction conditions, high grafting efficiency which reaches 87 percent, energy conservation, emission reduction, low cost and suitability for large-scale industrial production. The nano metal oxide prepared by using the method can be widely applied in the fields of rubber, coating, ink, dye, glass, piezoelectric ceramics, photoelectrons, medicament and the like.

The invention relates to a vehicle-mounted hybrid energy storage system of a railway vehicle and application of the vehicle-mounted hybrid energy storage system. The system comprises a lithium ion battery set module, a super-capacitor set module and a reconstructive type traction current transformer module, and the reconstructive type traction current transformer module comprises a traction current transformer; and a main circuit of the traction current transformer is formed by additionally arranging contractors S1, S2, S3, S4 and S5 and a filter inductor L on a main circuit of a traditional traction current transformer. When a train operates, the super-capacitor set module supplies power for the train through the traction current transformer; when the train pulls in and parks, the traction current transformer is reconstructed into a direct current-direct current transformer through powering on and powering off of the different contractors, and energy is transmitted to the super-capacitor set module from the lithium ion battery set module through the current transformer so as to charge energy needed by operation of a vehicle of a next station. The vehicle-mounted hybrid energy storage system of the railway vehicle does not need extra direct current-direct current transformers, and the manufacturing cost, the space cost, the complex rate and the like of the whole system are reduced.

The invention discloses a multi-component composite energy storage system grid combination control method based on power prediction, comprising steps of calculating difference value PV-L of the photovoltaic output power prediction value PV and the load power prediction value PL according to the photovoltaic output power prediction value PV and the load power prediction value PL and, utilizing a wavelet packet composition method to map PV-L to the subspaces of m wavelet packets to obtain signals with different frequencies, using the frequency signals which are close to the responding frequency of a storage battery in the frequency signals as low frequency signals P low which are complimented by the storage battery and using the rest of the frequency signals and the frequency signals which are not absorbed by the battery as high frequency signals P high which are complimented by a super capacitor, using an external loop control method and an inner loop current control method to output the real power of the storage battery and the super capacitor and control the charging and discharging power of the storage battery and the super capacitor by utilizing the state of charges of the super capacitor and the current, the state of charge and maximum charge-discharge power of the storage battery according to the real condition. The advantages of the invention are safe, stable, and economic in operation. Furthermore, the times of charging and discharging of the storage battery are reduced.

The invention discloses an indoor positioning method of path attenuation coefficient based database construction. The method is divided into a training stage and a positioning stage; the training stage is mainly to obtain a corresponding attenuation coefficient of each reference node in the environment and an average attenuation coefficient of signal propagation in the environment by utilizing the known received signal strength and distance information; the positioning stage is mainly to obtain a distance between a blind node and the corresponding reference node and a distance between the blind nodes by utilizing the corresponding attenuation coefficients of the reference nodes in the environment which are obtained in the training stage, thereby obtaining a relative coordinate position of each blind node. The indoor positioning method is high in positioning precision, simple in implementation, low in system power consumption and low in cost.

The invention discloses a sunflower-patterned cable dome, comprising a center inner ring girder, a stiffen member, a hoop cable, a ridge cable, a vertical strut, an inclined cable and a boundary ring girder; wherein, the center inner ring girder, the stiffen member, the ridge cable and the boundary ring girder form a sunflower-patterned net; one end of the stiffen member is hinged with the center inner ring girder, and the other end is hinged with one end of the ridge cable in the most inner circle; one end of the ridge cable in the most outer circle is anchored with the boundary ring girder; the upper end of the vertical strut is hinged with the ridge cable, and the lower end is hinged with one end of the inclined cable and the hoop cable, while the other end of the inclined cable is hinged with the ridge cable; the inclined cable in the most outer circle is anchored with the boundary ring girder; the hoop cable is closed along the hoop direction. The sunflower-patterned cable dome has the advantages of beautiful structure, excellent stress performance, improved bearing capacity and smooth transitional profile since the ridge cable easy to exit working of the prior art is changed into the stiffen member and the upper inner draw ring is changed into the inner ring girder.

The invention relates to a micro-grid optimization method based on a good point set quantum particle swarm algorithm. The micro-grid optimization method based on a good point set quantum particle swarm algorithm comprises the steps: establishing a micro-grid multi-target optimization model including a micro-grid multi-target optimization objective function formula and a micro-grid multi-target optimization constrained condition formula; using a good point set to improve a quantum particle swarm algorithm; and using the good point set quantum particle swarm algorithm to solve the micro-grid multi-target optimization model. The micro-grid optimization method determines the capacity of a micro gas turbine according to the maximum load, and re-optimizes the capacity of an intermittent distributed power supply and an energy storage system. During the solution process, the micro-grid optimization method utilizes the good point set quantum particle swarm algorithm, thus guaranteeing the optimization result and guaranteeing the good selectivity and instructiveness at the same time. As a built-in filtering-based on scheduling strategy can give full play to the characteristics of the micro gas turbine and the energy storage system, the micro-grid optimization method has the advantage of a spectrum analysis method and also has better timeliness, and can obtain the position and capacity of the distributed power supply, the energy storage system and the micro gas turbine in the micro-grid through calculation so as to realize economical efficiency in the isolated micro-grid and the integral optimization of discharge of pollutants.

The invention discloses a construction method for an H-type steel stiff column with a cross fracture surface. The construction method includes the steps of measuring and positioning, inspecting and checking before hoisting the H-type steel stiff column, hoisting the H-type steel stiff column in place, fixing the H-type steel stiff column temporarily, correcting the H-type steel stiff column, fixing the H-type steel stiff column, welding H-type steel stiff column and the like. The axis and perpendicularity of section steel column installation can be controlled accurately, structural construction is high in precision, construction quality is reliable, and the construction method is suitable for installation and construction of the H-type steel stiff columns with the cross fracture surfaces in a high-rise building, a super high-rise building, a long-span structure and a common structure.

The invention discloses an anchorage unit and a construction method using the same to ream a ground anchor. The construction method comprises the following steps: using a drill, to which a steel strand is bolted, to drill into the depths of the stratum under the condition that the surface soil is not dug out; rotating the drill, extruding the cement slurry and opening stirring blades at the same time; cutting, spalling, crushing and stirring the foundation soil; reaming to form an anchorage body made of cement-soil mixture with the diameter of the anchorage body being approximately 1.2m and the height thereof being approximately 2m; keeping the drill in the anchorage body to constitute the anchorage unit; then, rotating the anchorage unit, extruding the cement slurry and withdrawing a drill holder and a drill stem at the same time, so that a cement-soil protection layer can be formed outside the steel strand as an anchor cable; and forming the ground anchor after the cement-soil is solidified. By using a disposable drill as the frame of the anchorage unit, the invention has the advantage of reasonable structure, convenient construction and low construction cost, makes full use of the characteristics of the materials and greatly increases the pull-out resistance. Therefore, the anchorage unit is suitable for various anchoring angles, and the construction method constitutes a novel anchor method for fixing engineering structures and large equipment and reinforcing side slopes.

The invention discloses a Hash algorithm based on extensible precision chaos in information security, which comprises the following steps of: 1) taking input information as an initial parameter and a control parameter based on an extensible precision logistic mapping, setting the chaotic mapping iterations and the precision of the obtained chaotic random sequence; 2) carrying out the chaotic iterative computation based on extensible precision, obtaining a chaotic random sequence and saving in a one-dimensional array; 3) setting the number of information bits required to be extracted and saving the information bit number pairs in the chaotic random sequence of the one-dimensional array for grouping; and 4) setting seeds, randomly siting and saving the seeds in the array. The Hash algorithm is established on the basis of extensible precision calculation chaos and fully utilizes the characteristic of chaos. The invention provides the novel and safe Hash algorithm satisfying the demands of different users. The Hash algorithm can be applied to the field of computer science using a Hash technology, including the technical fields of computer security, information security, cryptology, pattern matching, digital communication and the like.

The invention relates to an off-grid control method of a micro-grid energy storage device based on power prediction and adopts a double-loop control strategy. The control of the storage battery adopts voltage to control an external loop and adopts current to control the internal loop; the control of a super capacitor adopts power to control the external loop and adopts the current to control the internal loop. Photovoltaic output power PV and load power PL of different times in a day are determined according to a power prediction curve; a difference value signal P delta of the output power PV and the load power PL is calculated; a DB9 wavelet packet decomposition method is adopted to perform decomposition on the difference value signal P delta to obtain a high frequency part signals Phigh and low frequency part signals Plow; the low frequency part signals Plow is complimented by the output power of the storage battery; and the high frequency part signals Phigh is complimented by the super capacitor output power.

The invention belongs to the technical field of skin care, and discloses a skin barrier repair composition and a preparation method thereof. The composition is mainly prepared from the following components in parts by weight: 44.70 parts to 70.60 parts of deionized water, 0.05 part to 0.10 part of sodium hyaluronate, 0.50 part to 0.80 part of aloe vera gel juice, 0.50 part to 0.80 part of purslaneherb extract, 0.50 part to 1.00 part of radix stephaniae tetrandrae, 1.00 part to 3.00 parts of chondrus crispus extract, 1.00 part to 3.00 part of rice fermentation filtrate and 1.00 part to 3.00 part of saccharide isomerate. The preparation method comprises the following steps: A, preparing a phase solution A and a phase solution B respectively; B, adding the phase solution B into the phase solution A to obtain a mixed solution; C, adding an emulsifying agent S-305 into the mixed solution to obtain a mixed solution C; and D, adding ceramide, triethanolamine, the aloe vera gel juice, the purslane herb extract, the radix stephaniae tetrandrae, the chondrus crispus extract, the rice fermentation filtrate, the saccharide isomerate, phenoxyethanol and citrus into the mixed solution C, and performing stirring in a mixed manner to obtain skin barrier repair cream.

The invention provides a regenerated sand powder green concrete. The regenerated sand powder green concrete comprises, by mass, 10 to 93% of regenerated sand powder, 5 to 83% of a regenerated composite admixture, 0 to 20% of Portland cement, 0 to 5% of an alkali-activator, and 1 to 2% of an additive; a coarse aggregate free lightweight concrete with a density smaller than 1900kg/m<3> is prepared from regenerated sand powder and regenerated composite admixture at a double component doping amount of 70% or larger. The invention also discloses a preparation method of the regenerated sand powder green concrete. According to the preparation method, waste concrete cement stone flour and brick-concrete regenerated sand powder are subjected to mixing grinding so as to obtain the regenerated composite admixture which is a multi-component composite gelling material and possesses composite gelling and superimposed effect. The regenerated sand powder green concrete possesses the filling effect andmicro-aggregate effect of regenerated sand powder, and the gelling performance of the regenerated composite admixture, the double component doping amount is higher than 70%, so that regenerated material large amount doping is realized, and it is beneficial for promotion of building waste resource utilization and green development of concrete industry.

The invention provides a graphite and ceramic composite material and a preparation method thereof. The graphite and ceramic composite material is prepared by compounding a porous graphite framework and ceramic; the graphite and the ceramic are alternatively and uniformly distributed; the volume fraction of the porous graphite framework is 30 to 70%, and the balance amount is ceramic. The preparation method comprises the following steps of firstly, utilizing the porous graphite framework which is quickly prepared by a selective laser sintering forming technique, carbonizing, and coating the ceramic coating; utilizing a gel injection molding forming technique to fill the ceramic material, freeze-drying under the vacuum condition, discharging glue, and sintering at high temperature, so as toobtain the graphite and ceramic composite material. The graphite and ceramic composite material prepared by the preparation method has the characteristics that the heat conductivity is low, and the strength is high; the chemical stability is good, the heat expansion coefficient is low, the anti-thermal vibration ability is excellent, and the high-temperature metal liquid impact can be endured fora long time; after secondary mechanical cutting processing, the graphite and ceramic composite material can be repeatedly used for multiple times, and can replace the traditional water glass sand type; the graphite and ceramic composite material can be matched with the graphite casting in the production of steel castings.

The invention discloses a Cache Tier cache optimization method based on a Ceph cluster. The method comprises the steps: optimizing a cache, obtaining an existing cache pool mode of the Cache Tier, taking the request with the request size smaller than 128k as a small request, and taking the request with the request size larger than or equal to 128k as a large request; executing a writing operation,writing the small request into a cache pool, and writing the large request into a base pool through cache execution proxy writing operation; executing a reading operation, if the cache hits, traversing the object fragment information, and reading the object fragment information is read in a cache pool; after cache reading is finished, reading the data in a base pool; finally, splicing the data read from the cache pool and the base pool, filling and returning to the client. According to the method, the read-write mode of the cache pool is modified based on the processing mode of the requests of different sizes, and the read-write efficiency of the Ceph cluster is improved by optimizing the Cache Tier.

The invention discloses a preparation method of a nylon composite material. The preparation method of the nylon composite material comprises the following steps: adding nylon PA66, epoxy resin E-51, maleic anhydride elastomer and polyvinyl alcohol in a high-speed mixing machine; and dropwise adding dibutyltin dilaurate and chlorinated paraffin, mixing, adding a succinic anhydride compound and a coupling agent KH550, continuing stirring, adding medium-alkali glass fibers, magnesium hydroxide, aluminium hydroxide, ammonium polyphosphate, oxidation inhibitor and a lubricant, continuing stirring, then adding the material in a double-screw extruder, mixing evenly, carrying out melt extrusion, and cooling to obtain the nylon composite material. By the preparation method of the nylon composite material, the obtained nylon composite material has strengthened rigidity and hardness, the heat resistance, the size stability and the ageing property are excellent, and the nylon composite material is suitable for blow molding, and can meet requirements of various structural components such as automobiles, instruments and apparatuses and electronic and electrical products to high performance.

The invention pertains to the technical field of material testing, in particular to a metallic film specimen and its preparing method for evaluating and screening the stored materials in a museum. The invention uses modern and mature film-coating technology to coat silver and copper particle film in thickness of 100-300nm on surfaces of different substrates, so as to get the desired metallic film specimen. The invention can greatly reduce the use of metallic material, simplify operation and reduce cost; can avoid the shortcoming of poor repeatability of experimental data due to bulk metallic specimen, is good for digital analysis on the difference in specimen before and after corrosion, and overcomes any artificial error brought about by Oddy Test due to observation by naked eyes, and can greatly reduce the test period, is good for popularization and application in great scale.

The invention discloses a freshener composition and application thereof. The freshener composition is prepared from, by weight, 40-60 parts of L-menthol, 5-20 parts of N,2,3-trimethyl-2-isopropyl butamide, 5-20 parts of N-ethyl-L-menthyl formamide and 20-40 parts of cool oil. By the adoption of the freshener composition, people can feel a strong cool feeling at the beginning of tooth brushing while no obvious bitter taste is generated, and freshness and coolness can be maintained for a long time in the oral cavity after tooth brushing.

The invention relates to a multifunctional stress dispersing type expansive concrete steel pipe pile and a construction method. The steel pipe pile serves as a main structure. Holes in different formsare evenly distributed in a pile body, and expansive concrete is poured into the pile body or the expansive concrete and ordinary concrete are poured into the pile body segment by segment, a high-pressure grouting process is used in cooperation, stress dispersing expansive bodies in different forms are formed near the holes, meanwhile, a certain number of broken stones are selectively added, thecost is saved, the bottom end can be sealed through the ordinary concrete, and the bottom end can also be combined with a claw-type support to form a composite foundation. The reinforcing effect is obvious, the construction speed is high, the stress is evenly dispersed along the pile length, forward stress dispersing expansive bodies and backward stress dispersing expansive bodies achieve good compression resisting performance, anti-pulling performance and anti-floating performance, differential settlement is effectively reduced, and different pile types and construction methods can be selected according to different foundations.