95results about How to "Overcome weakness" patented technology

A lead-free alloy as solder contains Zn (5-10 wt.%), the rare-earth elements chosen from La, Ce, Pr and Nd (0.05-1), one or more of Bi (0.1-6), Cu (0.1-3), In (0.5-3), Al (0.1-1), Ni (0.01-1) and P (0.001-1), and Sn (rest). Its advantages are better wettability, fine structure, excellent mechanical performance, low cost and no poison and pollution.

The invention discloses an online course applicability evaluation method which belongs to the technical field of intelligent recommendation. Based on the analysis of the personal learning characteristics of a learner and online course teaching policies, the method establishes a correlation model for the personal characteristics and the learning effect of the learner by statistically calculating the personal learning characteristics and the online course learning effect of a large numbers of learners. The correlation model is used to predict the learning effect of the learner in a course to be selected. According to prediction results, the learner is helped to select the most suitable course for learning, namely a course with the best prediction result is selected for learning. According to the method, the learner can easily find the course suitable for the personal characteristics from a large number of course resources, so that the learning effect is improved; and in addition, the method can help the learner to better understand the details of the selected course in the aspect of teaching style and the like, so that the weaknesses of the learner can be effectively overcome in learning.

A resin composition containing an epoxy resin (B) and a cyanate ester resin (A) shown in formula (1) as a basic component, wherein R represents a hydrogen atom or a methyl group, and n is an integer of 1 to 50, The premise is that the cyanate resin (A) may be a mixture of compounds of formula (1) having different values ​​of n, and prepregs and laminates using the resin composition.

The invention provides a cooperative concurrent message bus, a driving member assembly model and a member disassembly method. The cooperative concurrent message bus comprises an information acquisition module, a parallel ring distributor, a linear memory block, a message filling module, parallel queue equipment, a message queue pool, a queue sequential manager, an entry mapping table and a system stack. According to the cooperative concurrent message bus, the driving member assembly model and the member disassembly method provided by the invention, the weakness of the existing concurrence implementation technology can be effectively overcome, and the concurrence technology and parallel programming is efficiently and reliably realized. The cooperative concurrent message bus, the driving member assembly model and the member disassembly method have the advantages of universality, low cost, high efficiency, energy saving, reusability, transparent distribution, microkernel, inherent object-supported technology and the like.

The invention discloses a breeding method of an apple dwarf self-rooting multi-branch nursery stock. The breeding method comprises the following steps: firstly selecting apple dwarf rootstock varieties G41, M9, Pajam1 and T337 as maternal stocks, establishing an apple dwarf rootstock breeding seedbed, and using saw dust to cover newly grown branches of the apple dwarf rootstocks on the seedbed from the beginning of June to the beginning of July, so as to breed the apple dwarf rootstocks with good root systems; planting the apple dwarf rootstocks in a density of 5000-6000 plants per mu in a nursery garden in spring, establishing the nursery garden for producing finished nursery stocks; and grafting apple variety in autumn in the same year to obtain the apple dwarf self-rooting multi-branch nursery stocks in the next year. With the adoption of the cultivation method provided by the invention, the disadvantages of poor quality of nursery stocks produced by the existing stock breeding method, thin and weak nursery stocks, and low survival rate of the nursery stocks in the established nursery garden are overcome.

The invention relates to a rotary lifting construction method for a cylindrical reticulated shell, and relates to a building construction method. The rotary lifting construction method comprises the following steps of: (1) splicing the cylindrical reticulated shell (1) on the ground; (2) supporting one end of the spliced cylindrical reticulated shell (1) by using a rotating hinge (3), and supporting a spliced extension operating surface (1-1) at the other end of the spliced cylindrical reticulated shell (1) by using a temporary support (4); (3) lifting the cylindrical reticulated shell (1) by using a lifter, so that the cylindrical reticulated shell (1) rotates around the rotating hinge (3), and continuing to splice the cylindrical reticulated shell (1) on the spliced extension operating surface (1-1); and (4) performing the lifting process and the splicing process alternately, so that the cylindrical reticulated shell (1) extends along the direction of an arc line until the cylindrical reticulated shell (1) reaches a designed position. By the rotary lifting construction method, the key problem of the forming of a cylindrical surface in the installation construction process of a cylindrical reticulated shell structure is solved, and an installation construction method without a support is provided.

The invention relates to an evaluation method and device for the system technology maturity. The method comprises the steps that 1) administrators set and store following contents, including system technology maturity evaluation levels and level details and system work breakdown structures and key technology items, in a database in advance; 2) experts evaluate the system technology maturity of the system key technology items and store the system technology maturity in the database; 3) evaluation data of all experts are processed comprehensively based on weighting and short plate threshold algorithms to obtain evaluation results of the system technology maturity. According to the evaluation method and device, the method that only one copy of the technology maturity evaluation level detail data is stored is used, the technological problem of repeated storage of a great number of data is solved through a multi-dimensional extension data storage and processing method, and evaluation of a plurality of technology items of significant complex systems by a plurality of experts and automatic data statistic analysis are achieved. The evaluation method and device have the advantages that the data storage and processing efficiency is improved, evaluation and organization work is convenient and flexible, evaluation costs are reduced, and the like.

A low-smelting-point lead-free alloy solder contains Zn, Cu, RE chosen from La, Ce, Pr and Nd, Bi and Sn. Its advantages are high wetting power and mechanical performance, no poison and pollution, and low cost.

The invention discloses a method for preparing copper radiating fins of gradient structures by means of injection forming, which belongs to the technical field of powder metallurgy. The method includes the steps: evenly mixing copper powder of different grain sizes and in different grain size distribution in proportion; respectively mixing the copper powder with paraffin base multi-component binders; forming copper radiating fin green bodies of different gradient structures by means of injection through a double-cavity injection molding machine; obtaining the copper radiating fins of complete structures by means of degreasing and sintering; and finally pressing bases of the copper radiating fins to prepare the copper radiating fins of the gradient structures. The copper radiating fins of the gradient structures prepared by the method are formed once without subsequent machining and are accurate in control and fine in repeatability, the radiating efficiency of the copper radiating fins is 20-50% higher than that of radiating fins with the relative density of 99%, and the copper radiating fins are excellent in radiating performance.

The present invention relates to plasmid vector capable of being used in gene recombinant technology, and the method of utilizing the plasmid vector in expressing target gene. The plasmid vector of the present invention features that it has colibacillus sigma factor sigma32 distinguished and regulated promoter. The method of utilizing the plasmid vector in expressing target gene includes inserting the expression vector gene into one of the plasmid vector of the present invention, transforming colibacillus host cell with the obtained recombinant plasmid and inducing the expression of the target gene in heat shock inducing method during the culture. The bioactive protein gene expression of the present invention has the advantages of low background expression, high recombinant protein yield, no use of chemical inducing agent, easy molecular operation, and no need of special gene reformation of host strain.

The present invention relates to an AL2O3-Fe base ceramic composite material and a production method thereof. The AL2O3-Fe base ceramic composite material is produced according to the following raw material preparation and steps, wherein the raw materials adopt AL2O3, CaCO3, SiO2, Fe and AL2O3.2SiO2.2H2O, and the steps comprise dry powder mixing ball milling, mixing pulping, molding, wax removing, high temperature vacuum sintering, surface treatment, inspection and the like so as to produce the AL2O3-Fe base ceramic composite material, and the AL2O3-Fe base ceramic composite material is produced by using the method. According to the present invention, the hydrogen protection reduction atmosphere is adopted to sinter during high temperature sintering, such that the elemental state Fe exists in the ceramic matrix after the intaken Fe-base material is sintered, ie., the elemental state Fe exists in the high alumina ceramic so as to provide a good toughening effect, overcome disadvantages of the high alumina ceramic and the zirconium ceramic, and enlarge related application fields.

The invention relates to the technical field of water environment and ecology restoration, in particular to immobilized preparation and application of algicidal bacterium microspheres. Bacterial cells in cultured algicidal bacterium liquid are separated and suspended in a beef extract peptone liquid culture medium 20-80% of original sample volume, polyvinyl alcohol and sodium alginate are selected as embedding bodies, a saturated boric acid solution of calcium chloride serves as a cross-linking agent, and immobilized cross-linking is performed at the temperature of 4 DEG C for 16-32 hours to prepare the algicidal bacterium microspheres. In addition, the invention discloses application of the algicidal bacterium microspheres in inhibiting of alga overgrowth, repeated adding of algicidal bacteria is avoided, and disposable addition of the algicidal bacteria is achieved. A nutrient substance adding mode is improved, the algicidal bacterium inhibiting effect of the algicidal bacteria is not affected, and water quality influence is also not brought. The preparation process is simple, the cost is low, large-scale popularization is easy, secondary pollution is not produced, and the algicidal bacterium microspheres provide an effective way for water bloom treatment.

The application provides a packaging method and structure of a ZnMgO solar-blind ultraviolet detector. A ZnMgO solar-blind ultraviolet detector chip is fixed on a pedestal; an interdigital electrode is lead out by a metal wire as a pin of a packaging structure of a ZnMgO solar-blind ultraviolet detector; the ZnMgO solar-blind ultraviolet detector chip is packaged by using a packaging adhesive through which ultraviolet light can pass and the exposed metal wire and connection part are packaged by using epoxy resin, thereby forming a complete packaging method of the ZnMgO solar-blind ultravioletdetector. Therefore, the ZnMgO solar-blind ultraviolet detector chip can be applied beyond the laboratory and the application range of the ZnMgO solar-blind ultraviolet detector chip is extended, so that practicability of the ZnMgO solar-blind ultraviolet detector chip is enhanced. When the device is exposed in air in use, the performance parameters are stable; and because of the led-out pin, theplug-and-play effect is realized; and a defect that the chip that is not packaged only can be tested in a lab is overcome.

The network system integrating centralized algorithm and distributed algorithm is applicable to Internet/Intranet environment, and is includes: on the lateral attitude the upper level and lower levelmanagement connection is set in turn, and a three-layer structure including control centre layer, logic server layer and interconnection network platform layer is formed. Said network system utilizesthe download management system and upload management system which are set on its longitudinal direction and the above-mentioned three-layer structure to form the distributed algorithm mode and closedenvironment operation mode so as to can flexibly implement management of customer terminals, can high-effectively utilize various resources distributed in the interior of organization and implement effective management and safety control of system.

The invention discloses a vitrified silicon rubber insulation fireproof cable which comprises a cable core, wherein the cable core is formed by stranding a plurality of insulation wire cores; a flame resistance filler is filled in a gap in the cable core; an armor layer is extruded on the cable core; and an outer sheath is extruded on the outermost layer. Each insulation wire core consists of a middle conductor and a vitrified silicon rubber insulation layer wrapping the conductor. Large-length and high-specification production is realized; a product is soft and convenient to assemble and lay; the number of middle joints is small; and the performance can completely meet the standard requirement of ore insulation cables.

The invention discloses a symmetrical ternary string represented voice perception Hash sequence constructing and authenticating method. The method comprises the steps that firstly, overall discrete wavelet transforming (DWT) is carried out on voice signals produced after preprocessing and intensity-loudness transformation (ILT); secondly, non-overlapping partitioning is carried out on the low-frequency part of the voice signals produced after DWT, and short-time logarithm energy of blocks is calculated to obtain the signal frequency-domain features; lastly, a final ternary perception Hash sequence is generated based on the time domain spectrum flux features (SFF) of the voice signals, and the voice frequency content is quickly authenticated through Hash matching. The symmetrical ternary string representation of the perception Hash abstract is superior to that of the binary form, the common voice content is operated between the robustness and the difference in a balanced mode, the time complexity of the algorithm is low, efficiency and the abstraction are high, precise manipulation detecting and positioning can be achieved, and the method can be used for authenticating a mobile voice communication terminal with bandwidth resources limited in real time.

The invention discloses an automobile interior polypropylene composition low in smell and density and a preparation method thereof. The automobile interior polypropylene composition is composed of, by mass, 70-85 parts of polypropylene, 5-15 parts of impact modifier polyolefin elastomer, 8-15 parts of talc powder, 0.1-0.5 part of antioxidant and 0.5-1.0 part of smell absorbing agent. The automobile interior polypropylene composition has the advantages of being low in smell, meeting the Changan smell standard 2.5 grade, and being low in density, capable of reducing product weight, excellent in mechanical property, good in rigid-tough balance and good in forming performance.

The invention relates to an MPPT control method suitable for a photovoltaic cell. A double-straight-line approximation method and a small step perturbation and observation method are used for tracking the MPPT of the photovoltaic cell. Firstly two approximate straight lines between a maximal power point voltage and an ambient temperature and illumination intensity are established according to a photovoltaic cell equivalent model. Then a maximal power point voltage is determined according to the acquired ambient temperature, the illumination strength and two approximate straight lines. Then a PWM pulse signal of a driving switch device is generated through PI adjustment according to a difference between an actually output voltage of the photovoltaic cell and a maximal power point voltage. The photovoltaic cell is adjusted to next to the maximal power point, and finally a maximal power point is accurately tracked through the small step perturbation and observation method. The MPPT control method has advantages of high speed, high efficiency, high control accuracy, simple algorithm, low requirement for a controller, and convenient engineering implementation.

The invention discloses an insect-proof durable filament for plastic woven bags. The insect-proof durable filament is characterized by comprising, by weight, 100 parts of polypropylene, 0.1-0.5 part of pyrethroid, 1-1.8 parts of crosslinking agents, 80 parts of filled plastic master batch, 2.8-3.0 parts of acrylic acid dimethyl amino ethyl ester, 0.25-0.45 part of nano-graphite, 0.4-0.85 part of antioxidants, 1.1-1.5 parts of silane coupling agents, 2-8 parts of toner, 0.3-0.8 part of butyltin oxide and 0.2-0.3 part of polypropylene wax. The insect-proof durable filament for the plastic woven bags has the advantages that the insect-proof durable filament comprises the ultrafine talc powder filled master batch, accordingly, problems of weakness, old appearance and the like of flat filaments can be effectively solved, and the appearance quality and the flexibility of the insect-proof durable filament which is a flat filament can be greatly improved; the insect-proof durable filament additionally comprises the pyrethroid, accordingly, the problem that plastic flat filaments are vulnerable to insect bite and damage can be effectively solved, and the application range of the insect-proof durable filament can be further expanded.

An energy-saving efficient desulfurizing and dusting method and apparatus using afterheat is disclosed. Said method features that the residual of high-temp fume is used to heat water to become steam, which is then sprayed out at high speed by the nozzle of Venturi tube to provide power for forcing the fume to pass through said apparatus. Said apparatus is composed of Ventiru tube and desulfurizing-dusting tower. In the contraction segment of venturi tube, there are primary heat exchanger, secondary heat exchanger and nozzle. Its advantages are low cost and high efficiency of 90% of desulfurizing and 99.5% for dusting.

The invention discloses a method that measures far ultraviolet irradiance for spatial environmental simulation, comprising steps of: determining a spectral radiance brightness in the strongest direction in a facula generated by the irradiation source; measuring micro-current at the strongest point in a facula and calculating spectral radiance at the point under single wave according to the pectral radiance brightness; solving the pectral radiance in a total wavelength scale as a reference spectral radiance; measuring micro-current at other positions in the facula and obtaining radiance at other positions according to direct proportion of the current and radiance. The measuring method of the invention is simple to operate, and has simple measuring device and low cost. The method at the same time is widely applied to irradiance measurement of far ultraviolet for spatial environmental simulation.