48results about How to "Effective collision" patented technology

Disclosed is an upstream access method in an Orthogonal Frequency Division Multiple Access (OFDMA)-based mobile communication system in which a random access method in an OFDMA network includes randomly selecting, by each subscriber device, one of a plurality uplink random access channels, if a random access request to the OFDMA network is transmitted by each subscriber device, accessing through the selected channel if a collision has not occurred in the selected channel, randomly selecting one of the uplink random access channels, if a collision has occurred in the selected channel, and if the number of retries for channel selection is less than a predetermined value, and determining whether a has collision has occurred, accessing through a finally selected channel, if it is determined that a collision has occurred; and randomly selecting one of the uplink random access channels if it is determined that a collision has occurred.

The invention relates to successful preparation of a Co-MOF-71 nano-material. According to the invention, preparation process conditions are optimized; the prepared Co-MOF-71 nano-material is uniform in crystal grain size and has good stability; and when Co utilizes the acidic catalysis reaction of MOF framework metal ions, the metal ions are active sites and the supporting points of a framework, and metal ions undergo coordination in the process of catalysis. The prepared Co-MOF-71 material has high metal content and completely exposed metal sites; more Lewis acid site Co-MOF-71 materials can be provided; and the material is beneficial for total activation of reactant molecules and has good catalytic activity.

The invention discloses a dendritic polymer structure based triplet-triplet annihilation upconversion luminescent material, and relates to the technical field of photon upconversion. The upconversion luminescent material comprises a dendrite structure based annihilation agent formed by covalent modification of 9, 10-diphenylanthracene (DPA) on the periphery of an aromatic ether dendrite polymer. The upconversion luminescent material provided by the invention can realize the upconversion luminescence under the condition of low excitation light power density in a solution and solid, and is a novel upconversion luminescent material.

The invention discloses a copper-loaded mesoporous carbon catalyst for benzene hydroxylation and a preparation method thereof. The preparation method comprises the following steps: dissolving hydroxypropyl-beta-cyclodextrin in a dilute sulphuric acid water solution; then adding tetraethyl orthosilicate and cupric nitrate; uniformly stirring, and then distilling to obtain a gel substance; placing the gel substance in an open container for aging; then drying; carbonizing under the protection of an inert gas; soaking a carbide in an HF solution; then filtering; sequentially washing with absolute ethyl alcohol and deionized water; and drying to obtain the copper-loaded mesoporous carbon catalyst for benzene hydroxylation. The copper-loaded mesoporous carbon catalyst shows a certain catalytic activity and high selectivity for directly preparing phenol through benzene hydroxylation, and has the benzene conversion ratio of 74% and the phenol selectivity of 98%.

The invention belongs to the technical field of VOCs processing devices, and relates to a device and method for processing VOCs through asymmetrical single-medium barrier discharge. The device comprises a draught fan, a power supply and a box body. A flow equalizing plate, an electrode fixing plate and a discharging unit are arranged in the box body. The discharging unit is of an asymmetrical discharging electrode structure, and comprises a metal electrode and an insulating medium pipe. The metal electrode is prepared from a metal rod with threads and fins. A medium internal electrode preparedfrom a conductive material is arranged in the insulating medium pipe. Gas containing VOCs enters the device from the inlet, is equalized by the flow equalizing plate and then enters a high-density strong plasma discharging area to collide and react with high-activity particles produced by discharging for degradation, coking substances produced in the discharging process are collected by a groovein the metal electrode, and the discharging stability and the high processing effect and efficiency are kept. The device has the advantages of being long in cleaning cycle, high in VOCs processing efficiency and the like, and is suitable for processing VOCs pollution in related industries.

The invention discloses a dust settling water bag for blasting demolition of buildings, which consists of slurry, a blasting device and a blasting-proof water bag. Raw materials of the slurry include, by weight, 96-98kg of water and 2-4kg of dust adhesive. Raw materials of the dust adhesive include, by weight, 1.0-2.2 kg of cohesive soil, 0.3-0.5kg of binder, 0.3-0.5kg of sodium alcohol ether sulphate and 0.4-0.8 kg of table salt. The production steps of the dust settling water bag for blasting demolition of buildings include of preparing the dust adhesive by mixing the cohesive soil, the binder, the sodium alcohol ether sulphate and the table salt, preparing the slurry by adding water into the dust adhesive and uniformly stirring the same, producing the blasting device by inserting a detonator into 75-100g waterproof stick explosive, pouring 50-80kg of the slurry into the blasting-proof water bag, arranging the blasting device into the center of the blasting-proof water bag, thereby producing the dust settling water bag for blasting demolition of buildings. The dust settling water bag effectively solves the difficult problem that dust generated in blasting demolition of buildings flies anywhere in air, is low in cost and convenient in product and use and has the dust settling efficiency higher than 95%.

The invention discloses a cement external circulation vertical mill combined high-performance grinding process system, which comprises an external circulation vertical mill, a combined powder concentrator, a cyclone dust collector, a first conveying chute, a dry stirring mill, a second conveying chute, a fine powder blending bin, a coarse powder blending bin and a mixer. The external circulation vertical mill and combined powder concentrator are connected end to end, an upper discharge port of the combined powder concentrator is connected with the cyclone dust collector; a discharge port of the cyclone dust collector is connected with the first conveying chute; an outlet of the first conveying chute is divided into two paths, one path is connected with the dry stirring mill, and the other path is connected with the coarse powder blending bin; a discharge hole of the dry stirring mill is connected with the second conveying chute; an outlet of the second conveying chute is connected with the fine powder blending bin; and outlets of the fine powder blending bin and the coarse powder blending bin are connected with the mixer. The advantages of coarse grinding of the external circulation vertical mill and fine grinding of the stirring mill in the aspects of process and energy consumption are exerted, the fine powder energy consumption of the external circulation vertical mill is reduced, the particle size distribution of the final product can be flexibly adjusted according to the ratio of coarse powder to fine powder, and the cement performance is improved.

The invention discloses a method for preparing 2,3,5-trimethylhydroquinone diester. The method comprises the following steps: carrying out rearrangement reaction on oxoisophorone and acetic anhydrideunder the catalysis of amino acid and polyethylene glycol modified mesoporous molecular sieve loaded solid acid to prepare the 2,3,5-trimethylhydroquinone diester. The method adopts amino acid and polyethylene glycol modified mesoporous molecular sieve loaded solid acid as the catalyst, has the advantages of high oxoisophorone conversion rate, high product selectivity, small environmental pollution and recyclability of the catalyst, and can overcome the defects of complex operation, serious equipment corrosion and the like in an existing process.

The invention discloses a preparation method of composite magnetic powder. The preparation method comprises the following steps that an alloy ingot is smelted according to the nominal composition MnxBi100-x (mole fraction x = 45, 50, 55), and the alloy ingot is coarsely crushed. According to the preparation method, the prepared MnxBi100-x alloy ingot fragments are put into a mortar to be coarselyground, screening is conducted through a 100-mesh grid sieve after grinding is completed, and the obtained MnxBi100-x alloy powder is subjected to low-energy ball milling compositing; a proper amountof the prepared MnxBi100-x alloy powder is put into a ball milling tank, meanwhile, alpha-Fe micron powder which is 5% of the mass of the MnxBi100-x alloy powder is put, then a proper amount of ethanol and non-magnetic steel balls with proper sizes are added, the ethanol is taken as a ball milling medium, the ratio of the mass of the steel balls to the mass of the MnxBi100-x alloy powder is 10:1,and finally the powder is put into a planetary ball mill; and after the powder is put into the planetary ball mill, the ball milling time is set to be 1-6 hours, the ball milling rotating speed is 256revolutions per minute, and the clockwise/anticlockwise rotating alternating time is 6 minutes, so that the high-saturation magnetization alpha-Fe/MnBi composite magnetic powder is obtained. The process is simple and easy to operate, and the production cost of the high-performance permanent magnet is reduced.

The invention belongs to the technical field of mineral flotation, and particularly relates to a mineral flotation system. The device comprises a rotatable ore pulp barrel, a flotation groove communicated with the ore pulp barrel, a rotating barrel capable of rotating is arranged in the flotation groove in a sleeved mode, the rotating barrel is communicated with the ore pulp barrel through a pipeline, one end, connected with the rotating barrel, of the pipeline is located at the upper end of the barrel wall of the rotating barrel or close to the barrel wall of the rotating barrel, the rotatingbarrel and the ore pulp barrel rotate synchronously, the lower part of the rotating barrel is of a cone structure and is in a reduced diameter shape from top to bottom, an upper overflow port and a lower underflow port are formed in the upper end and the lower end of the rotating barrel respectively, the flotation groove is communicated with the ore pulp barrel through the rotating barrel and thepipeline; the system further comprises a bubble generation device, and the bubble generation device is communicated with the flotation groove. According to the mineral flotation system, the effectivecollision rate of the bubbles can be improved when the mineral flotation work is carried out, so that the collision probability between the bubbles and the mineral particles to be recovered is increased, and then the flotation efficiency is improved.

The invention relates to a double-tuned inertance system in the civil engineering and energy infrastructure field. The system comprises a first-grade collision friction type tuning mass unit, a second-grade tuning mass unit, a liquid inertance damping unit and an installation unit. In the invention, a double damping tuning mechanism is established to adjust a system frequency and carry out dampingcontrol, and the frequency bandwidth of the effective damping control of the damping system is increased. The two grade tuning mass units and the liquid inertance unit are used to store energy. The nonlinear collision of a collision friction block and a liquid inertance damping dissipation structure are used to vibrate energy. Based on the quality synergy effect of the liquid inertance unit, additional mass required for the first-grade collision friction type tuning mass unit is greatly reduced, and a light-weight tuning damping device is provided. In addition, the inertance unit effectivelycontrols the deformation of the entire first-grade collision friction type tuning mass unit, the installation space of the device is saved, the efficiency of the internal damping energy consumption of collision friction block damping is improved, and the system has a wide application prospect.

The invention discloses vibration filtration multistage dust removal equipment for building dust removal. The vibration filtration multistage dust removal equipment comprises a machine body; a power rotating box rotating block for power transmission is arranged on the upper side of the machine body; a capturing cover for collecting building dust is arranged on the left side wall body of the machine body; an air inlet fan cavity used for sucking dust in is formed in the portion, on the right side of the capturing cover, of the machine body, and fixing rods are fixedly arranged on the upper sidewall body and the lower side wall body of the air inlet fan cavity. An inertial dust removal device is arranged, and efficient and effective preliminary dust removal can be carried out through a simple mechanical mechanism; by arranging a vibration dust removal device, the dust can be in vibration contact with a filtering device through mechanical vibration and effectively collides with the filtering device, so that the dust can be removed by the filtering device more efficiently; by arranging a water mist dust removal device, water mist sprayed out in a rotating mode can make full contact with the dust in air, and therefore the effective dust removal effect is achieved.

The invention discloses a brake device, and particularly discloses a brake device for ink application for color printing equipment. The invention aims at solving the problems of complex operation, high speciality and low operability of an ink application device for a color printing machine in the prior art. The brake device disclosed by the invention comprises a shell body, wherein a hollow handleis arranged at the lower end of the shell body; a handgrip sleeves into the handle; a through hole is formed in the upper end of the handgrip; a pull buckle is arranged at one side of the handle; a movable rod group capable of horizontally moving is connected to the pull buckle; a first tooth plate is further arranged at one end connected with the movable rod group, of the pull buckle; a first gear engaged with the first tooth plate is arranged above the first tooth plate; a second gear engaged with the first gear is arranged above the first gear; a third gear coaxially rotating with the second gear is arranged at the centre of the second gear; and a second tooth plate engaged with the third gear is arranged above the third gear. The brake device disclosed by the invention is simple to operate, applicable to common users, capable of being repeatedly used, environment-friendly, and practical.

The invention discloses a preparation method and application of a carbon-phosphorus-boron ternary co-doped copper/nickel-based catalyst, and the preparation method comprises the following steps: S1, dissolving a copper salt and a nickel salt in deionized water, and magnetically stirring at 50-80 DEG C for 3-5 hours to obtain a mixed solution; s2, adding a catalyst carrier into the mixed solution, performing pressurized impregnation adsorption for 1-3 hours under the pressure condition of 0.5-1.5 MPa, then dropwise adding a 0.02-0.03 mol/L sodium citrate solution, performing stirring reaction for 6-12 hours at the temperature of 20-100 DEG C, filtering, and drying to obtain a composite precursor; s3, placing the composite precursor in a tubular furnace, carrying out heat treatment at 500-600 DEG C for 1-3 hours, then introducing mixed gas of CH4 and PH3 at a flow rate of 250-500 sccm, and carrying out vapor deposition for 2-4 hours to obtain solid particles; and S4, adding the solid particles into a 0.02-0.1 mol/L H3BO3 solution, stirring for 10-20 minutes, controlling the solid-to-liquid ratio to be 1g/10mL, carrying out solid-liquid separation, washing with deionized water for 3 times, and drying, so as to obtain the carbon-phosphorus-boron ternary co-doped copper/nickel-based catalyst. The ZSM-5 molecular sieve is used as a carrier, sodium citrate is used as a metal complexing agent, Cu < 2 + > and Ni < 2 + > grow in situ, non-metallic elements of carbon, phosphorus and boron are deposited, and the selectivity and catalytic activity of the catalyst are improved.

The invention discloses a method for preparing flaky aluminum oxide with a high radius-thickness ratio by taking lotus roots as a template. The method comprises the following steps: adding malonyl urea and polyaluminum chloride sol into a diluted hydrochloric acid solution to obtain a solution A; drying fresh lotus roots, cutting the lotus roots into blocks, washing the lotus roots, and immersing the lotus roots into a glucose solution for filling to obtain a lotus root precursor B; dropwise adding a melamine solution into the solution A, then dropwise adding a dilute sodium hydroxide solution until the pH value is 7.5-8.5, and adding the lotus root precursor B for soaking to obtain a mixed solution C; transferring the mixed solution C into a microwave ultrasonic hydrothermal synthesizer for reaction, and collecting to obtain a mixed solution D; pouring an upper-layer turbid solution of the mixed solution D, washing, dehydrating and drying the obtained product, and collecting to obtain a solid E; uniformly mixing the solid E, potassium aluminum fluoride and silicon dioxide in proportion, sintering, cooling, collecting a product, washing and drying to obtain the high-radius-thickness-ratio flaky aluminum oxide. The method is simple, low in cost, high in product purity and good in orientation, and the preparation efficiency of the product is effectively improved.

The embodiment of the invention provides a passable area exploration method and device, a storage medium and an electronic device.The method comprises the steps that a passable area included in a target map is divided, and at least one target passable sub-area is determined based on the division result, the target map comprises a map of an area where the robot with autonomous exploration capability is located; based on the existence state of the obstacle in the at least one target passable sub-area, determining an exploration point set for exploring the passable area; and controlling the robot to explore the passable area based on the exploration point set. Through the method and the device, the problems of excessive collision, high exploration time consumption and low success rate when the robot explores the passable area in the prior art are solved, the collision times when the robot explores the passable area are reduced, the safety of the robot and the surrounding environment thereof is ensured, meanwhile, the exploration time is shortened, and the exploration efficiency is improved. And the success rate of exploration is improved.