911results about How to "Excellent performance index" patented technology

The invention relates to a boiling bed hydrogenation catalyst and a preparation method. The boiling bed hydrogenation catalyst of the invention is spherical shape which diameter is 0.1mm to 0.8mm, and has appropriate amount of additives and hydrogenation of metal components, and has reasonable hole distribution. The catalyst preparation method of the invention is spherical carrier impregnation, the process of spherical carrier preparation is following: making catalyst carrier raw material which is in appropriate temperature into appropriate size grain, then spheroidizing the grain, heating the conglobation and making them into spherical catalyst carrier. The process for making the catalyst carrier raw material into the appropriate size grain is that wet stock passes screen stencil by mechanical action and generates grain. Between the processes of the making grain and nodularization, granular material primely is placed for a period of time or operates in low-speed in nodularization device for a period of time. The catalyst of the invention appropriately conducts the boiling bed hydrogenation for heavy oil, residual oil.

The invention discloses a low-welding crack sensitivity steel board and manufacturing method, which comprises the following parts: not more than 0.07% C, 0.15-0.40% Si, 1.00-1.60% Mn, not more than 0.015% P, not more than 0.010% S, not more than 0.30% Cu, not more than 0.50% Ni, not more than 0.30% Cr, not more than 0.30% Mo, not more than 0.08% V, not more than 0.08% Nb, 0.010-0.020% Ti, not more than 0.003% B, Fe and inevitable impurity. The invention is characterized by the following: (1)displaying lower welding crack sensitivity component with Pcm not more than 0.20%; (2)mating the strength and flexibility reasonably with fitful yielding ratio; (3)making the price and property of the steel board superior to the congeneric import product; (4)making the maximum breadth of steel board to 4000mm; (5)simplifying the technique to ensure higher flatness without quenching water.

The invention relates to a preparation method of a star polycarboxylic acid high-performance water reducing agent. Polybasic alcohol and (methyl) acrylic acid used as main raw materials for esterification are esterified and polymerized to prepare the star polycarboxylic acid high-performance water reducing agent material: the (methyl) acrylic acid and polybasic alcohol used as reactants are esterified under the action of a catalyst to firstly prepare a star polymerizable active terminal, and free-radical polymerization reaction is carried out with unsaturated polyethenoxy ether, molecular weight regulator and unsaturated carboxylic acid monomer under the action of an initiator to prepare the star polycarboxylic acid high-performance water reducing agent. The invention is easy to control, and has the advantages of high polymerization degree, low cost and no pollution; the esterification reaction is carried out form an active core, and the free-radical polymerization is carried out to generate the chain arm, thereby implementing the polycarboxylic acid high-performance water reducing agent in a star molecular structure; and under the condition of common doping amount and low doping amount, the star polycarboxylic acid high-performance water reducing agent has better cement paste flowability and holding capacity than the traditional linear and comb polycarboxylic acid water reducing agents, and has favorable cement adaptability and concrete application performance.

The invention discloses a floating vehicle-based traceability vehicle self-networking communication privacy protection protocol, which is characterized in that a floating vehicle is used as a mobile RSU (Remote Subscriber Unit), a floating vehicle auxiliary grouping technology is adopted, the floating vehicle F adopts V2V communication, vehicles running in the same direction in an effective communication radius are united to spontaneously form a group, F is used as a group leader and is in charge of authorizing the validity of the vehicles and maintaining a group key and a specified group parameter; and F and all members respectively have a one-to-one secret channel negotiated by anonymous certificates issued by an authentication center (TA), the members sends messages to be broadcasted to the F by using the channels, the F is subjected to the message anonymilization and encrypted by using a group key-based symmetric encryption algorithm and then forwarded to other members or other groups, and when the messages are disputed, under the authorization of the TA, the real identity of the vehicle generating the messages can be accurately located.

The invention discloses a synthesis method of a polycarboxylic acid high-performance water reducing agent of a star-like structure, belonging to the field of a water reducing agent. According to the synthesis method, polybasic alcohol, (methyl) acrylic acid, a polyethylene glycol compound and the like are used as esterification raw materials, and the polycarboxylic acid high-performance water reducing agent of the star-like structure is prepared through a sequential esterification and polymerization method, i.e., the (methyl) acrylic acid and the polybasic alcohol are used as reactants, a star-like polymerizable active end is prepared through esterification reaction under the action of a catalyst, and then the polycarboxylic acid high-performance water reducing agent is prepared from the star-like polymerizable active end and esterification macromolecule, a molecular weight regulator and an unsaturated carboxylic acid monomer under the action of an initiator through free radical polymerization reaction. The synthesis method has the advantages of simplicity, easiness in control, high polymerization degree, low cost, no pollution, capability of realizing the polycarboxylic acid high-performance water reducing agent of the star-like structure connected with a plurality of polycarboxylic acid molecules, and more superior cement paste fluidity and holding capacity, good cement adaptability and concrete application performance compared with the conventional linear and comb-shaped polycarboxylic acid water reducing agent in the case of normal and low added amount.

A composite admixture for cement or high-performance concrete and a preparation method thereof. The admixture comprises silicon manganese slag, slag, limestone, furnace slag or fly ash, and grinding aids, and the mass ratios are: 50-70 of silicon-manganese slag, 10-20 of slag, 8-15 of limestone, 10-15 of furnace slag or fly ash, and 0.5 or 2 of grinding aids. The preparation method comprises: adding the raw materials according to the ratios into a ball mill, grinding till the grinding fineness meets that the Blaine specific surface area is not less than 400 m2 / kg or 450 m2 / kg so as to obtain the silicon manganese slag-based composite admixture for cement or high-performance concrete. The preparation of the admixture can use a large amount of industrial waste residues - silicon manganese slag discharged from the production of silicomanganese alloy, and the admixture is prepared with a proper amount of slag, limestone, furnace slag or fly ash, and a small amount of grinding aids, which has remarkable economic effect, and outstanding social benefits and environmental benefits.

The present invention discloses a multi-positive-ion amide-type asphalt emulsifier and a preparation method thereof, and the asphalt emulsifier is prepared from raw materials of N-hydrogenated tallow-1,3-propylene diamine, an alcohol solvent, acrylamide, a low-carbon tertiary amine, industrial hydrochloride and epichlorohydrin in the molar ratio of N-hydrogenated tallow-1,3-propylene diamine to alcohol solvent to acrylamide to low-carbon tertiary amine to industrial hydrochloride to epichlorohydrin of 1mol: (5.00-11.00) mol: (3.00-3.10) mol: (2.02-2.10) mol: (2.02-2.10) mol: (2.02-2.08) mol. The alcohol solvent is ethanol, methanol or isopropanol. The low-carbon tertiary amine is a trimethylamine aqueous solution, triethylamine or triethanolamine. The asphalt emulsifier synthetic raw materials are readily available, production cost is low, a process is simple, and a high temperature reaction is not required. The asphalt emulsifier can emulsify a variety of different types of asphalt, the prepared emulsified asphalt is fine, uniform, and good in storage stability, and positive-ion-type emulsified asphalt can be prepared.

The invention relates to desulfurized gypsum based antistatic self-leveling mortar and its preparation method. Adopting calcined desulfurized gypsum as the main raw material, the desulfurized gypsum based antistatic self-leveling mortar comprises the following components by weight: 25-45 of desulfurized gypsum, 5-10 of slag powder, 3-10 of fly ash, 5-12 of portland cement, 15-25 of quartz sand, 15-25 of steel slag sand, 0.03-0.2 of modified carbon fiber, 0.5-2.0 of redispersible emulsion powder, 0.02-0.07 of cellulose ether, 0.10-0.25 of a water reducer, 0.1-0.4 of an antifoaming agent, 1.2-2.5 of an early strength agent, 0.02-0.06 of a retarder, and 0.002-0.005 of a carbon nanotube. The desulfurized gypsum based antistatic self-leveling mortar has good antistatic performance, bonding property, wear resistance, as well as high compressive strength, and overcomes the defect of poor water proofness of gypsum based materials. By utilizing a lot of industrial solid waste, the self-leveling mortar of the invention has the advantages of environmental protection, energy saving, and low cost, etc., and can be applied in various building ground projects with requirements for electrostatic protection and levelability.

The invention relates to an improvement of a special vegetable organic culture medium for soilless cultivation of vegetables, in particular to a vegetable organic culture medium by using Chinese medicine residues as main raw materials. The vegetable organic culture medium is characterized by comprising the following components: Chinese medicine residues, 86.7-130kg / m<3>; peat, 65-86.7kg / m<3>; vermiculite, 122.5-163.3kg / m<3>; urea, 1.1-2.2kg / m<3>; superphosphate,1.6-3.2 kg / m<3>; potassium chloride, 1.5-3.0kg / m<3>; and a water-retaining agent, 1-2kg / m<3>. Aiming at the defects of the existing vegetable organic culture medium, the invention provides a production process and technology of the organic culture medium by using Chinese medicine residues as main raw materials. The organic culture medium produced by the technology can meet the demand of vegetables on fertility in a full growth cycle, no fertilizer or a little amount of fertilizer is only applied once in the middle and later states of cultivation, so the fertilizer and water can be saved, the time and labor are saved, the labor cost is reduced, and the benefit of vegetable production is effectively improved.

The invention provides a method for directly producing high-purity electronic level cobaltous sulfate by using cobalt-containing waste, in particular a process for producing cobaltous sulfate by using cobalt-containing waste. The method comprises the steps of: checking and classifying raw materials, wet-milling and size-mixing, acid-decomposing, filtering, washing, separating, and extracting copper sponge. The method is characterized by also comprising the steps of: removing iron with a goethite process, extracting P2O4 and removing impurities, separating nickel from cobalt, extracting N235, purifying, concentrating and crystallizing. The high purity electron level cobaltous sulfate is directly regenerated by using various kinds of cobalt wastes, the requirement of the modern high-technology industry on high purity of the cobaltous sulfate is met; the total recovery of the cobalt is higher than or equal to 98 percent; various usable elements can be comprehensively recycled, and coppersponge, tungsten carbide, iron hydroxide and nickel carbonate can be regenerated while the electronic level cobaltous sulfate as a main product is regenerated. The invention has the advantages of comprehensively utilizing waste cobalt resources, recycling the wastes, improving the enterprise benefit, and being beneficial to the development of energy conservation, emission reduction, environment protection and circular economy.

The invention relates to an environment-friendly heat conduction insulating glue used by high-power LEDs, which is characterized by being prepared from the following raw materials in percentage by weight: 50-68 percent of micro-grade high-thermal conductive powder, 18-30 percent of epoxy resin, 4-10 percent of curing agent, 7-15 percent of solvent, 0.6-1.5 percent of accelerator and 1-2 percent of additive; and the micro-grade high-thermal conductive powder is selected from a mixture formed by one or more of micro-grade aluminum powder, palladium powder, platinum powder, gold powder, C powder, AlN powder and SiC powder. The invention also relates to a preparation method of the heat conduction insulating glue. The environment-friendly heat conduction insulating glue used by high-power LEDsis obtained by optimizing the matching ratio and the modification of the raw materials and improving and simplifying the preparation process. Besides high resistivity, the heat conduction insulating glue also has high thermal conductivity, higher working temperature, strong viscosity, high cutting strength and fine performance index.

The invention discloses a strengthening composite bamboo board and preparing method, which consists of net bamboo fiber bundle layer and surface layer, wherein the net bamboo fiber bundle layer is composed of parallel grain and cross grain. The invention is prior to wood fiber board, which prevents the common bamboo board (bar structure of multiple-layer parallel adhesion) from deforming and uneven strength.

The invention discloses a preparation method of a polyester type pure solid polycarboxylic acid high-performance water reducing agent, belonging to the field of water reducing agents. According to the invention, by taking a (methyl) acrylic acid monomer and a polyethylene glycol compound as reactants, a polymerizable macromonomer is prepared through esterification reaction under the effect of a catalyst, and the polymerizable macromonomer conducts a free radical bulk polymerization reaction with an unsaturated carboxylic acid monomer and a chain transfer agent under the effect of an initiator in an environment without any solvent to obtain the polyester type pure solid polycarboxylic acid high-performance water reducing agent. The method disclosed by the invention has strong process controllability, high degree of polymerization and low cost and prevents environmental pollution; a completely anhydrous polyester type pure solid polycarboxylic acid high-performance water reducing agent is prepared through esterification reaction and bulk polymerization, which has neat cement paste liquidity and holding ability, cement adaptability and concrete application performance similar to a traditional solution method; meanwhile, since the polymer product is an anhydrous pure solid, a solution with any concentration can be prepared according to actual needs; and without the after-treatment processes such as heating and drying, solvent separation and the like, the transportation is more convenient, and good market competitiveness and application prospects are realized.

A process for preparing baking ceramsite from solid waste belongs to the field of architectural materials. The invention bakes ceramsite products with high property by employing coal gangue, sludge and waste glass powder as raw materials. Components percentage by weight in the formula comprise the coal gangue of 15-45%, urban domestic dry sludge of 25%-50% and waste glass powder of 20%-50%. Ceramsite green-ware prepared according to the formula are heat-insulated at a temperature of 300DEG C-600DEG C for 20-50 minutes after being dried and carbon discharging is carried out, and then baked at a temperature of 950DEG C-1100DEG C for 8-20 minutes to obtain the ceramsite products, the property of which meets the Lightweight Aggregates and its Test Methods GB / T 17431.1-1998 Standards.

The invention discloses a portable Terahertz remote sensing detector and a remote detection method. The detector comprises a signal generating device, a detector, a processor and an imaging display device, wherein the signal generating device comprises a Terahertz wave radiation source, a broadband tunable laser and a plasma generator; and the detector comprises a receiving element, a detecting element and a signal modulation circuit. The detection method comprises the following steps of: 1, dividing scanning subregions and pixel points and encoding scanning output frequencies of various scanning subregions; 2, arranging an assembly and generating a remote detection signal; 3, performing two-dimensional scanning; and 4, performing signal analysis processing, namely rapidly imaging and generating a Terahertz wave image with frequency spectrum characteristics, identifying a material type of a tested object, generating a charge coupled device (CCD) image and identifying the shape of the tested object. The detector is reasonable in design, easy to operate, flexible in detection mode, wide in application range and good in detection effect, and can fulfill the aims of rapidly imaging and remotely detecting by combining THz and induced fluorescence spectrum analysis with space imaging.

The utility model relates to an embedded SoC chip-based industrial wireless network monitoring system, pertaining to the Industrial monitoring technique field of the electronic communication. The system comprises a monitoring center, a couple of acquisition converters, a couple of collectors and the software. The collectors are subject to the acquisition converters and the software is installed on the collectors and the acquisition converters. Also, related software is available for the monitoring center's server. The SoC chips inside the collector and the acquisition converter is equipped with the built-in 32-bit RISC processor core, which support more than five types of the power consumption patterns; also, the built-in network protocol stack is adopted to meet the overall requirements needed by the wireless observe and control leading end for the high performance, the high reliability and the low power consumption. The ZIGBEE standard-oriented short distance wireless communication network is introduced to realize the wireless route and the on-site intelligent monitoring. In addition, VPDN technology is adopted to conduct the remote data transmission. The utility model has the advantages of low cost, high performance index as well as easy upgrading and maintenance afterwards. So, the utility model is applicable to the e-transaction terminal, the water monitoring system and relevant monitoring system.

An array-type flexible electric eddy sensor is composed of sensing coil array on the film substrate, leading-out signal line, grounding line, multi-channel gating switch and clapp oscillator. Its advantages include not deformation and high temp performance and consistancy.

The invention belongs to the field of image processing. According to the invention, the consistence of an objective evaluation result and subjective evaluation is higher; and moreover, the development of a 3DTechnology is promoted to a certain extent. According to the technical scheme provided by the invention, a three-dimensional image quality objective evaluation method based on graph-based visual saliency comprises following steps of 1), by using a structural similarity SSIM algorithm, calculating comparison functions of the brightness, contrast, and structures of a reference right image and a right image; 2), through adoption of a GBVS (Graph-based Visual Saliency) graph saliency calculation model provided by the improvement of a characteristic graph technical method, calculating the saliency characteristics of a distorted image; and 3), carrying out weighted calculation on the image quality weights obtained in the step 1) and the saliency graph of the distorted image obtained in the step 2). The method is mainly applied to image processing.

A wettable powder of bacillus thuringiensis and beauveria bassiana relates to a mixed biopesticide, aiming to the shortcomings of prevention and treatment limitations of beauveria bassiana and bacillus thuringiensis (Bt), particularly poor quick-acting property of microbial pesticides. The wettable powder provided in the invention is prepared from the following components: 10-14wt.% of bacillus thuringiensis, 4-14wt.% of beauveria bassiana, 3-5wt..% of wetting agent, 10-20wt.% of dispersant, 0.1-0.5wt.% of ultraviolet protectant and 50-60 wt.% of carrier. The wettable powder of bacillus thuringiensis and beauveria bassiana provided in the invention is high in activity, stable in effect, long in persistence and convenient for use.

The invention pertains to the technical field of composite material science and environmental protection and relates to opening coal dust polluting inhibitor and the preparation method thereof. The inhibitor is the hydrophilic material compounded by a plurality of compounds, and every compound and the weight percentage thereof is that: 15-20 percent main film forming resin, 25-30 percent auxiliary film forming resin,1-2 percent thickening agent, 15-20 percent dispersant, 2-3 percent mould inhibiting antiseptic agent, 1-2 percent anti-sedimentation agent, 2 percent defoamer, 15-20 percent powder and 3-5 percent color paste. The invention adopts the theory of gravity flow mat gloss solidification, which effectively overcomes the disadvantages of uneven film forming thickness, long film forming time, poor stability of film layer, etc of original self-solidification inhibition materials. The invention has low price, and production thereof is simple and practical; in addition, the invention has remarkable economic, environmental and social benefits, and is applicable to treat raised dust pollution in the fields of shipping, power, mine, road, metallurgy, etc.

The invention relates to a self-clean self-purification cement-based facing material and a production method thereof. The self-clean self-purification cement-based facing material comprises the following components in parts by weight: 20-30 parts of white silicate cements, 5-10 parts of mineral admixtures, 0-20 parts of quartz sands of 20-30 meshes, 20-30 parts of quartz sands of 40-70 meshes, 20-30 parts of quartz sands of 70-100 meshes, 1-4 parts of kieselguhr, 2-4 parts of zeolite, 0.2-0.6 part of nanometer titanium dioxide, 0.5-2.0 parts of EVA redispersible latex powder, 0.2-0.8 part of organic silicon water repellent, 0-1 part of ferric oxide inorganic pigment and 0.1-0.7 part of other chemical additive. The self-clean self-purification cement-based facing material, provided by the invention, has the advantages of good self-clean property, good self-purification property, good air purification capacity, good adhesive property, good construction property, good endurance quality, higher compression strength and the like, when the self-clean self-purification cement-based facing material is used for decoration of facings of an inner wall space and an outer wall space of a building, the air purification effect and the decoration effect are good, and the self-clean self-purification cement-based facing material can be applied for decoration engineering of all kinds of facings of walls of buildings.

The invention belongs to the technical field of building material, and more specifically relates to a ternary cementitious system stucco finish, and an application method thereof. The ternary cementitious system stucco finish is composed of white Portland cement, sulphate aluminium cement, gypsum, superfine slag powder, zeolite powder, latex powder, cellulose ether, an air entraining agent, an antifoaming agent, a water repellent, a thixotropic agent, an inorganic pigment, an quartz sand. The ternary cementitious system stucco finish possesses excellent physical mechanical properties; setting time and operable time are controllable; development of early strength is rapid; strength is high; bonding strength with matrix is high; no shrinkage cracking is caused; durability is excellent; no crystalline bloom is caused; stain resistance is excellent; and decorative effect is excellent. The ternary cementitious system stucco finish is suitable for decoration engineering of building internal and external walls and building thermal-insulation decorative integrated systems; relatively mechanical strength is achieved in a relatively short term; construction efficiency is increased; performance of long-term application is excellent; and engineering quality is ensured.

The present invention relates to a HRB500 and HRB500E coiled reinforcing steel bar production process, which comprises the following process: A, heating a steel billet, wherein three-stage type heating is adopted, the steel billet adopts V or VN microalloying, a size is 150 mm*150 mm, a temperature of a first-stage heating segment of the steel billet heating process is 800-950 DEG C, a temperature of a second-stage heating segment is 950-1100 DEG C, and a soaking segment temperature is 1050-1150 DEG C; B, carrying out temperature control rolling, wherein a rolling starting temperature is 950-1050 DEG C, a finish rolling starting temperature is controlled to 850-930 DEG C, and a final rolling speed is controlled to 27-100 m / s; C, carrying out temperature control cooling, wherein a laying temperature is controlled to 820-870 DEG C, a cooling fan is opened to carry out rapid cooling, a cooling rate is controlled to 8-25 DEG C / sec, a final cooling temperature is controlled to 650-680 DEG C, and natural cooling or slow cooling is performed; D, collecting the coiled material; E, inspecting; and F, packaging. The process has characteristics of controllable process, low production cost, and high production efficiency, wherein yield strengths of the produced HRB500 and HRB500E coiled reinforcing steel bars are more than or equal to 500 MPa, tensile strengths are more than or equal to 630 MPa, yield strength ratios are more than or equal to 1.25, elongation rates are more than or equal to 15%, the total elongation rates under the maximum force are more than or equal to 9.0%, performance indexes are excellent, and the produced HRB500 and HRB500E coiled reinforcing steel bars are uniform and stable.

The invention discloses mineral-oil-based high-temperature chain oil and a preparation method thereof, belonging to the field of chain oil production. The high-temperature chain oil is prepared from the following raw materials in proportions by weight: high-pressure hydrogenated mineral oil of kettle bottom vacuum residue, a high-temperature antioxidant, a detergent, a dispersant, an extreme-pressure anti-wear agent, a rust inhibitor and an antifoaming agent. Compared with the prior art, the mineral-oil-based high-temperature chain oil disclosed by the invention has the characteristics of lowevaporation loss, almost no smoke, no carbon deposition, excellent lubricating properties and wear resistance and the like, and can be widely applied to high-temperature chain lubrication occasions below 300 DEG C.

A low-density (200-550 Kg / cu.m) board is prepared from rice and wheat straws and the adhesive which is the mixture of isocyanate resin and urealdehyde resin or phenolic resin through pretreating, applying adhesive and hot pressing.

The invention relates to a lawn mower for pruning lawns at places, such as courtyards, parks, road sides and the like, particularly to an environment-friendly (with artificial foot protection and silencing slots) pushing-riding dual-purpose mower. The invention has the main improvements that a grass feeding rod comprising reverse hook teeth is arranged at the front part of the lawn mower; an artificial foot protection plate comprising a rotary hinge is respectively arranged at both sides of the middle part of the mower; a pushing-riding dual-purpose wheel comprising a foot pedal is arranged at the rear part of the mower; a silencing slot (comprising a silencing pipe and a water tank) is particularly and additionally arranged; a balancing weight is replaced by water, thereby lowering the transportation cost; self-moving is assisted by foot pedaling, thereby saving fuel and exercising bodies; the silencing pipe is added, thereby reducing the noise; the protection plates are added, thereby ensuring the safety; pressed grass is also centered; and the lawn grass-pressing mower with the comprehensive effect is beneficial to grass feeding, weight balancing, noise reduction, temperature reduction, energy saving, environmental protection, soil moisture preservation and safety.

The invention discloses an automatic fiber laying variable-angle path planning method for a non-developable curved surface part, which relates to a fiber laying path plan making method for a non-developable curved surface part and is used for solving the problem that in the complexity of a fiber laying process, the appearance accuracy and various properties of a composite material are influenced by inevitable shearing and re-conveying phenomena occurring in the automatic fiber laying process of the non-developable curved surface part. In a scheme I, the method comprises the following steps of: acquiring data information from a non-developable revolving barrel part; calculating the laying reference angle of a presoaked tow on each intersection line; determining points on an initial path; determining points on other paths; and making a path line. A scheme II is different from the scheme I in that data information is acquired from a non-developable curved surface variable-section conical shell part; and a scheme III is different from the scheme I and the scheme II in that data information is acquired from a non-developable curved surface variable-section joint part. The method is used for planning an automatic fiber laying variable-angle path on the outer surface of the non-developable curved surface part.

The invention relates to a low-complexity load balancing route algorithm based on an LEO satellite network. According to the technical characteristics, a latticed low-orbit satellite communication system similar to an Iridium satellite constellation is configured; according to inter-satellite link design in latitude and longitude directions, each satellite calculates a next hop of satellite node in a distributed manner by utilizing the netted topological structure of a satellite constellation, the queuing time delay is calculated, and a route is determined through a satellite node notification mechanism. According to the invention, the design is reasonable, the route algorithm is utilized to lower time complexity and obtain an optimum path, a load balancing means is utilized to balance flows and avoid congestion, the low-complexity load balancing route algorithm is applied to the low-orbit satellite communication system similar to the Iridium satellite constellation, the network performance index is better than those of other conventional route algorithms, and the time complexity is obviously lowered; and especially when the number of network nodes are substantially increased, the performance of the algorithm is better than that of the conventional algorithms.

The present invention relates to low temperature sintered microwave dielectric ceramic for dielectric antenna, filter and other RF elements and devices in mobile communication system and its preparation process. The low temperature sintered microwave dielectric ceramic has (Ca, Mg)SiO3 as main component, CaTiO3 for regulating the temperature coefficient of frequency, and Li2CO3 and V2O5 as sintering assistant. The present invention features Li2CO3 and V2O5 lowering the sintering temperature of the ceramic system to below 900 deg.c, special technological process improving the characteristic of powder and slurry matching with silver electrode, the dielectric constant of 8-10, quality factor higher than 25000 GHz, the temperature coefficient of resonant frequency approaching zero, low cost, etc.

The invention discloses a preparation method of a pantograph pan composite material for high-speed electric multiple units. The preparation method comprises the following steps: proportionally weighing raw materials: 30-60 percent of chopped carbon fiber, 20-30 percent of phenolic resin powder, 10-20 percent of pitch coke powder, 10-20 percent of crystalline graphite powder, and 1-10 percent of copper powder, uniformly mixing the weighed raw materials, pouring the mixture into a moulding press die for compression moulding, successively placing a green body into a muffle furnace for pre-oxidation, a carburization furnace for carburization, an isothermal chemical vapor deposition furnace for densification, and a high-temperature graphitization furnace for graphitization, and obtaining the pantograph pan composite material. The pantograph pan composite material is processed to obtain a carbon-carbon composite material pantograph pan. The carbon-carbon composite material pantograph pan, which is prepared according to the preparation method, is not only short in cycle and low in cost, but also excellent in various performance indexes, can supply stable and safe electric power for the high-speed electric multiple units, and ensures the efficient operation of a locomotive.