Connected two-in-one patch for strainless hernia repair

Gait recognition method in ship environment based on dual millimeter wave radars

The invention discloses a gait recognition method in a ship environment based on dual millimeter-wave radars, which comprises the following steps: S1, setting a first millimeter-wave radar and a second millimeter-wave radar, so that the first millimeter-wave radar detects upper limb characteristics of a person, and the second millimeter-wave radar detects lower limb characteristics of the person; the detection ranges of the first millimeter-wave radar and the second millimeter-wave radar are not overlapped; s2, processing detection data of the first millimeter-wave radar and the second millimeter-wave radar to obtain a 3D point cloud feature map of the upper limbs, a speed-time feature map of the upper limbs, a speed-time feature map of the lower limbs and a rhythm frequency-speed feature map of the lower limbs; and S3, noise reduction is carried out on each feature map obtained in the S2, the feature maps are input into an mmGRnet network, and gait types are output after operation of the ...

Rotary compressor and bent axle thereof

The utility model discloses a rotary compressor and bent axle thereof. The bent axle includes main shaft portion and forms the eccentric portion in main shaft portion, is equipped with in the off -centre portion to subtract heavy balancing hole, subtracts the volume of heavy balancing hole and the ratio more than or equal to 8% of an off -centre volume. According to the utility model discloses an under the bent axle, can be at the offset that keeps the bent axle unchangeable prerequisite, lighten the eccentric quality of bent axle, shorten the distance of the skew rotation center axis of focus of bent axle, reduce to use the rotary compressor's of this bent axle the eccentric inertial force of rotation simultaneously, reduce the vibration and the noise of compressor, improve the long -time maintainability of compressor. And the reduction of rotatory eccentric inertial force, the weight of compressor inner equilibrium piece can be be convenient for alleviate or even the balancing piece avoided ...

FeV45N10 ferric vanadium nitrate and combustion synthesis method thereof

The invention provides a FeV45N10 ferric vanadium nitrate product prepared through combustion synthesis and a production method thereof. The FeV45N10 ferric vanadium nitrate product comprises the following components in percentage by mass: 43.0-47.0 percent of V, 9.0-13.0 percent of N and the balance of Fe and less impurities. According to the production method, single FeV50 is used as a raw material and is crushed, wherein the crushed FeV50 with a grain size of 40-100 mu accounts for 26-36 percent, the crushed FeV50 with a grain size of 100-200 mu accounts for 27-36 percent, and the crushed FeV50 with a grain size of more than 200 mu accounts for 32-44 percent. A nitridation synthesis process comprises the following steps: adding the uniformly-mixed ferric vanadium synthetic material powder into a graphite crucible, then placing the graphite crucible in a high pressure synthetic furnace, introducing a high-purity nitrogen with the pressure of 7-12 MPa after a furnace door is closed, and ...

Compressor and air conditioner

The utility model discloses a compressor and air conditioner. The compressor includes: a housing. Binding post, binding post establishes on the casing, and terminal visor, terminal protection housing is established binding post is last, wherein the terminal visor is in through at least two installation column mouting on the casing. According to the utility model discloses a compressor, with the terminal visor through at least two installation column mouting on the casing, can make the terminal visor install on the casing firmly, avoided on the one hand coming off of terminal visor, on the other hand is when the binding post damage and when resulting in the refrigerant to be revealed, the reliability that sets up the speed of revealing that can also reduce the refrigerant to a certain extent, the use of improvement compressor of terminal visor.

Low-heat silicate cement and its preparing process and application

A silciate cement with low hydrous heat for high-performance concrete engineering is prepared from portland cement clinker (more than 90%), glypsum (less than 10%) and C2S (at least 40%). Its preparing process features simple coarse grinding and enhanced fine grinding. Its advantages include low hydrous heat and water requirement, and high flowability strength and durability.

一种低热硅酸盐水泥及其制备和应用

... 本发明涉及的是一种可用于重点工程高性能混凝土、大体积混凝土、水工混凝土的高性能水泥一低热硅酸盐水泥及其制备和应用，其配比为高贝利特水泥熟料≥90％，石膏≤10％，熟料C#-[2]S含量不低于40％，水泥的凝结时间通常控制在初凝≥45min，终凝≤10h。生产时减少现有水泥磨粗磨仓内的大球数10～30％，增加细磨仓内的钢段数10～30％。用本发明所述水泥替代通用硅酸盐水泥或中热硅酸盐水泥配制混凝土具有低水化热、低需水量、高流动性、高强度及高耐久性等特点。 ...

Gaobeilite cement clinker and prepn. process thereof

Computation model of entrance channel passing capability and forecast emulation method thereof

The invention relates to a calculation model of the loading capacity of an approach channel and a forecasting simulation method, comprising the flowing steps: first, a mathematical model for the landing habit of a ship is established; second, a mathematical model for the loading capacity of a confined channel is established; and third, a system simulation model is established. The method researches the theoretical model for the loading capacity (saturation) of the confined channel for the first time, the application of the model not only can provide powerful technology support and scientific data for the planning and design of a main channel of a port, but also has a very important and practical significance in ensuring the safety of port operation, improving the comprehensive utilization of the port resource, guaranteeing an excellent navigation environment and a good navigation order on the port waters, promoting the sustainable development of the port. The application of the method has ...

Ship cabin visible light positioning method based on light intensity compensation

The invention relates to a ship cabin visible light positioning method based on light intensity compensation, which comprises the following steps of: detecting light intensity data when a receiving end of each coordinate point of a ship cabin is vertically upward when a ship is berthed, and collecting and detecting the light intensity data, attitude angle information and real position coordinate information; constructing a light intensity compensation model; constructing a convolutional neural network visible light positioning model based on light intensity compensation; a to-be-positioned target is conveyed into a ship cabin, and a receiving end collects and stores detection light intensity data, target attitude angle information and target height information of each LED lamp; and inputting target attitude angle information and target height information into the light intensity compensation model to obtain corrected received signal intensity data, inputting the corrected received signal ...

High-strength alloy steel lining plate material and preparation method thereof

The invention discloses a high-strength alloy steel lining plate material which contains the following chemical elements in percentage by mass: 0.2-0.4% of carbon, 0.2-0.4% of silicon, 0.2-0.4% of manganese, 0.2-0.4% of chromium, 0.2-0.4% of nickel, 0.2-0.4% of zinc, 0.04-0.07% of Bi, less than or equal to 0.04% of S, less than or equal to 0.04% of P and the balance of iron. The alloy steel material disclosed by the invention has excellent mechanical property, high impact toughness, high hardness, good abrasion resistance, low cost and wide market prospect. According to the invention, the waste iron is partially used as a raw material which is refined twice, the heat treatment temperature after casting is reasonably controlled, the raw material is fed in batches, thus the alloy quality is more stable and uniform, and the comprehensive mechanical performance is improved. A refining agent adopted in the invention is applied to casting production, and the yield is obviously increased; and ...

Auto-waterproof bridging particle

The invention provides an auto-waterproof bridging particle which belongs to the field of engineering materials. The particle is formed by mixing 20 to 85 weight parts of sulphoaluminate cement, 5 to 26 weight parts of aluminoferrite cement, 5 to 20 weight parts of alumina material, 3 to 10 weight parts of gypsum, 2 to 10 weight parts of microdilatancy component, 0 to 5.0 weight parts of setting time regulating agent, 0 to 5.0 weight parts of hardening accelerator, 0 to 1.0 weight parts of plasticizing agent and 0 to 3.0 weight parts of binding material. The bridging particle of the invention is characterized by rapid bridging, swelling in water, permeating crystallization, auto-healing for fine crack and permanent waterproof property and can efficiently solve the problem of bridging the concrete structure which is leaked.

High-temperature resistant and wear-resistant alloy steel lining plate material and preparation method thereof

The invention discloses a high-temperature resistant and wear-resistant alloy steel lining plate material which comprises the following chemical elements in percentage by mass: 0.2-0.4% of carbon, 0.2-0.4% of silicon, 3.5-3.7% of manganese, 0.7-0.9% of chromium, 0.8-1.1% of molybdenum, 1.2-1.4% of vanadium, 0.1-0.15% of lanthanum, 0.04-0.07% of Nb, less than or equal to 0.04% of S, less than or equal to 0.04% of P and the balance of iron. In the lining plate provided by the invention, the alloy steel obtained by adding the elements such as lanthanum, molybdenum and niobium into low-carbon steel has the advantages of high hardness, high strength, good wear resistance, high-temperature resistance, good toughness, good plasticity, corrosion resistance and high cost performance. In the lining plate material disclosed by the invention, the waste iron is partially used as the raw material, secondary refining is performed, the thermal treatment temperature after casting is reasonably controlled ...

Sea ice early warning method and system based on sonar and radar data fusion

The invention discloses a sea ice early warning method and system based on sonar and radar data fusion, and the method comprises the steps: enabling a radar to effectively observe the sea ice exposed out of the sea surface above the water surface through the data combination of the sonar and the radar, estimating the width and height of the sea ice exposed out of the sea surface and the distance between the sea ice and a ship, and achieving the early warning of the sea ice. The sonar equipment capable of adjusting the sound wave emission angle can well detect the width and the thickness of underwater sea ice and the distance from the ship, and detection of the overall condition of the sea ice can be achieved by adopting fusion of sonar data and radar data; according to an early warning mechanism established according to the safety of ship navigation and a sonar and radar one-screen display mode, a ship driver is helped to carry out auxiliary observation on the danger degree of front sea ...

Quick leakage-stopping agent

Vanadium extracting method capable of dynamically adjusting acid

The invention provides a vanadium extracting method capable of dynamically adjusting acid, which belongs to the technical field of vanadium extraction process. According to a technical scheme in the invention, the method comprises the following steps: determining a feed ratio of an extraction stock solution to an organic phase according to the extraction saturation concentration of the organic phase and the content of to-be-extracted metal in the extraction stock solution and determining the total adjusting amount of acid according to the feeding amount of the extraction stock solution, an acid-base value and the desired amount of acid in transformation of an extractant; and simultaneously adding a dilute sulphuric acid solution in two or three sections in the process of extraction so as to allow the pH value of the extraction stock solution to rapidly arrive at acidic extraction conditions. The method has the following beneficial effects: since extraction and acid adjustment are carried ...

Method and device for monitoring active state of ship driver based on physical channel

The invention discloses a ship driver active state monitoring method based on a physical channel. The method comprises the following steps: A, acquiring on-duty state information of a driver; b, analyzing the amplitude and phase of the state information; c, preprocessing the amplitude and the phase, and screening high-correlation data of the on-duty state of the driver; d, performing multi-level dispersion feature extraction to obtain dispersion features, and selecting an optimal feature value group by using a data evaluation algorithm; e, screening an optimal characteristic value, classifying by using a support vector machine, and identifying the number of people on duty; f, an activeness evaluation system is established, activeness evaluation is carried out, and the driver on-duty activeness is obtained; and G, constructing a minimum activeness standard of the operator on duty, and judging whether the operator is in a safe navigation state. The invention further discloses a ship driver ...

Method for producing ferrovanadium nitride by adopting self-propagating high temperature synthesis process

The invention relates to a method for producing ferrovanadium nitride by adopting a self-propagating high temperature synthesis process, which comprises the following steps of: firstly, crushing ferrovanadium in grinding equipment; drying and then charging the crushed ferrovanadium into a crucible in bulk; placing the crucible into a high-pressure synthesizer and filling 6-12MPa of nitrogen; starting an igniting device and igniting the raw materials to carry out synthetic reaction; automatically sustaining combustion synthesis reaction; and cooling and taking out the combusted and synthesized ferrovanadium nitride in the nitrogen and crushing into blocks, wherein the ferrovanadium and the nitrogen are used as raw materials. The method for synthesizing and producing the ferrovanadium nitride does not need additional energy sources, has no pollution, high synthesis speed, energy saving, environmental protection and high efficiency and is a hi-tech production process which is worthy of popularization ...

Novel high sulfur-resistant cement

Advancing nitrogen gas device and contain device's combustion synthesis equipment of combustion synthesis equipment

The utility model provides a combustion synthesis equipment advance the nitrogen gas device, including furnace body inside lining, water jacket and breather pipe, the furnace body inside lining with the water jacket directly links to each other and forms the closed space, be provided with the cooling water in the closed space, the furnace body inside lining with the shell type connection is inlayed to the water jacket, and form and inlay the trepanning, the breather pipe passes through inlay the trepanning direct with the furnace body inside lining is fixed to link to each other. The utility model provides a combustion synthesis equipment advance the nitrogen gas device, the breather pipe is direct to link to each other with the inside lining, and not with the water jacket contact, greatly reduced snap the possibility. Can effectively reduce stops production overhauls the number of times, improves production efficiency greatly.

Efficient bulking agent of calcium aluminate and its preparing process

An efficient bulking agent of calcium aluminate for concrete (mortar) is prepared from high-Al cement clinker (10-30 %), anhydrite (40-70%), calcined kaolin (10-30%) and high-Al slag (5-20%) through grinding to 300-400 sq.m/kg. It can be proportionally added to concrete or mortar to obtain shrinkage-compensated concrete or the concrete members with high self-stress (2-3 MPa).

Quick leakage-stopping agent

A quick leakage-stopping agent is prepared from high-Al cement clinker (70-80%), lime (0.2-1.0%), lithium carbonate (0.01-0.05%), alunite (5-15%) and gypsum (10-20%) through mixing and grinding untilits specific surface area is greater than 400 sq.m/kg. Its advantages are quick solidification, high strength, no contraction, and high water-stopping nature.

Heat-resistant alloy steel liner plate material and preparation method thereof

The invention discloses a heat-resistant alloy steel liner plate material comprising the following chemical element components in percentage by mass: 1.2-1.4% of carbon, 1.2-1.4% of silicon, 2.6-2.8% of manganese, 0.9-1.2% of molybdenum, 0.05-0.08% of copper, 1.2-1.4% of titanium, 0.04-0.07% of Hf, less than or equal to 0.04% of S, less than or equal to 0.04% of P and the balance of iron. The liner plate disclosed by the invention has excellent heat resistance and corrosion resistance, relatively high hardness and wear resistance, and relatively high strength and good toughness at the same time, the wear resistance of the liner plate is improved by more than 2 times as compared with a high manganese steel liner plate, and the performance-price ratio is high. The heat-resistant alloy steel liner plate material disclosed by the invention is prepared by using part of scrap iron as a raw material, performing secondary refining on the raw material, reasonably controlling the heat treatment temperature ...

Rotary compressor and bent axle thereof

The utility model discloses a rotary compressor and bent axle thereof. The bent axle includes main shaft portion and forms the eccentric portion in main shaft portion, is formed with side cut portion in the off -centre portion, and side cut portion has a perfect understanding the up end of off -centre and/or has a perfect understanding the lower terminal surface of off -centre. According to the utility model discloses the bent axle under the prerequisite that the offset is unchangeable that keeps the bent axle, lightens the eccentric quality of bent axle, shortens the distance of the skew rotation center axis of focus of bent axle, reduces to use the rotary compressor's of this bent axle the eccentric inertial force of rotation simultaneously, reduces the vibration and the noise of compressor, improves the long -time maintainability of compressor. And the reduction of rotatory eccentric inertial force, the weight of compressor inner equilibrium piece can be be convenient for alleviate or ...

Device and method for preparing methanol by using low-temperature plasma synergistic catalyst

The invention discloses a device and a method for preparing methanol by using low-temperature plasma in cooperation with a catalyst. Low-temperature plasma is used for generating discharge, H2 and CO2 are activated in the plasma reactor, the thermocatalytic reaction rate is increased, and energy consumption is reduced; condensate water is introduced to the outer side of the low-temperature plasma to improve the conversion rate and selectivity of the reaction. Gas treated by the low-temperature plasma is fed into the thermocatalytic reactor, a partition plate is arranged in the thermocatalytic reactor, so that backflow is formed at a local position in the thermocatalytic reactor, a plurality of catalyst outer bed layers are arranged inside and outside the partition plate, and different positions can be filled with different types of solid catalysts; according to the invention, the reaction of preparing methanol from CO2 can be carried out under normal pressure, the energy consumption is ...

Wireless traffic signal system and method thereof cooperated with vehicle tracks at intersections

The invention relates to the technical field of traffic control, in particular to a wireless traffic signal system and a method thereof cooperated with vehicle tracks at intersections. The invention adopts a special short-range communication mechanism. The system comprises intersection transmitting equipment, vehicle receiving equipment, a singlechip, voice output equipment, GPS (Global Position System) equipment and a vehicle display. The singlechip carries out data fusion processing on real-time traffic information and the longitude and the latitude of vehicles to obtain information of traffic signal lamps on the vehicle tracks and outputs the information to the vehicle display. The method comprises the step that the singlechip carries out data fusion on information of an electronic map, a real-time traffic lamp signal, vehicle track positioning and traveling direction and displays the traffic signal on the electronic map when the vehicles enter the communication range of a special short-range ...

Ship personnel hidden threatening article carrying detection method and device and electronic equipment

The invention provides a ship personnel hidden threatening article carrying detection method and apparatus, and an electronic device. The method comprises the steps of obtaining radar data returned by millimeter wave radars of multiple visual angles; filtering static object information to obtain first data, and performing joint estimation on the distance, azimuth angle and Doppler characteristics of the millimeter wave radar based on the first data to obtain a distance angle Doppler map; carrying out target detection on the feature map, carrying out multipath ghost elimination on radar radio frequency features, and carrying out feature cutting based on a target position of a person to obtain a target feature rectangular feature; filtering ship vibration noise in the radar data to obtain second data, and extracting micro-Doppler features in the movement process of the target personnel; and identifying the target feature rectangular feature and the micro-Doppler feature to obtain a detection ...

Wear-resistant alloy steel lining plate material and preparation method thereof

The invention discloses a wear-resistant alloy steel lining plate material which comprises the following chemical elements in percentage by mass: 0.2-0.4% of carbon, 0.8-1.2% of silicon, 3.6-3.9% of manganese, 1.2-1.4% of chromium, 0.2-0.3% of molybdenum, 0.04-0.07% of As, less than or equal to 0.04% of S, less than or equal to 0.04% of P and the balance of iron. The wear-resistant alloy steel provided by the invention has perfect hardness, strength and toughness; and moreover, the alloy composition is relatively low, the service life is longer than that of high-manganese steel, and the economy and comprehensive mechanical performance are better than those of the high-manganese steel and high-chromium cast iron. In the lining plate material disclosed by the invention, the waste iron is partially used as the raw material, secondary refining is performed, the thermal treatment temperature after casting is reasonably controlled, and the raw material is fed in batches so that the alloy quality ...

Calcium aluminate bulking agent and producing process thereof

Ship operator on duty alertness characterization evaluation method based on wireless signals

The invention discloses a ship operator-on-duty alertness representation evaluation method based on wireless signals. The method comprises the following steps: acquiring an operator-on-duty activity information matrix irrelevant to the environment; constructing an operator-on-duty behavior activity representation extraction network, and extracting an operator-on-duty behavior continuous representation vector; constructing an operator-on-duty behavior activity characterization analysis network, and projecting an operator-on-duty behavior continuous characterization vector to a lower-latitude characterization space; the behavior type and behavior occurrence time of the operator on duty are output by learning potential behavior activity distribution in the representation space; constructing an on-duty alertness evaluation module, and evaluating the alertness of the on-duty personnel sequence; and according to the behavior type and the behavior occurrence time of the operator on duty, the state ...

Single-antenna ship attitude measurement method and device and electronic equipment

The invention relates to a single-antenna ship attitude measurement method and device and electronic equipment. The method comprises the following steps: acquiring carrier phase observation values of each group of satellites in a single-antenna GNSS (Global Navigation Satellite System) of a target ship; carrier phase observation values of adjacent epochs are differenced by using an epoch difference algorithm, and a single-antenna TDCP speed measurement model under a geocentric coordinate system is determined; based on the single-antenna TDCP speed measurement model under the geocentric coordinate system, constructing a carrier speed model under the geocentric coordinate system; according to the carrier speed model under the station center coordinate system and the gravitational acceleration of the target ship, attitude information of the target ship is obtained through solving. According to the invention, the attitude measurement of the ship is realized by using the single antenna on the ...

Low-profile high-performance orthogonal mode coupler

The invention discloses a low-profile high-performance orthogonal mode coupler, which comprises a circular waveguide, an E-plane matching waveguide, an E-plane rectangular waveguide, an H-plane matching waveguide, an H-plane rectangular waveguide, a semi-cylindrical matching waveguide and a plurality of impedance adjusting blocks, wherein the impedance adjusting blocks are gradually increased from top to bottom; the OMT is low in profile, very simple in structure and easy to process; the performance is excellent, the standing wave bandwidth of each port with the VSWR smaller than or equal to 1.2 is higher than 20%, the standing wave of the circular waveguide port in the working frequency band is even lower than 1.06, and the isolation degree of the ports in the working frequency band is higher than 65 dB; the device has the advantages of compact and simple structure and excellent performance, is very suitable for batch production, and has good popularization value.

WATER-PROOFING POWDER MADE OF POWDERED COAL ASH AND PRODUCING METHOD THEREOF

Heated powdered coal ash is ground for several min. in grinding machine to which water-proofing agent whose main component is fatty acid is added for direct penetration and surficial treatment to make up water-proofing powder after hot-air drying. Said water-proofing powder features high water resistance and resisting ageing, acid and alkali and may be used individually or in conjuction with cementing material.

Rotary compressor and bent axle thereof

The utility model discloses a rotary compressor and bent axle thereof. The bent axle includes main shaft portion and forms the eccentric portion in main shaft portion, is equipped with the first heavy balancing hole that subtracts in the off -centre portion, firstly subtracts heavy balancing hole and upwards has a perfect understanding the up end of off -centre portion and have a perfect understanding the lower terminal surface of off -centre portion downwards, and the while is first to subtract the outer peripheral face that weighs the balancing hole and still have a perfect understanding off -centre. According to the utility model discloses an under the bent axle, can be at the offset that keeps the bent axle unchangeable prerequisite, lighten the eccentric quality of bent axle, reduce to use the rotary compressor's of this bent axle the eccentric inertial force of rotation, reduce the vibration and the noise of compressor, improve the long -time maintainability of compressor. And the ...

Multifunctional rolling spoon needle therapy

Special cereal thresher device for laboratory

The invention relates to an efficient cereal thresher device special for a laboratory, which comprises a box body, the upper side and the lower side of the box body are divided into a first threshing unit and a second threshing unit, the first threshing unit is communicated with the second threshing unit through a connecting port, and ears enter the first threshing unit to be threshed for the first time; after being separated, husks and grains are subjected to secondary threshing through the secondary threshing unit, and are filtered and screened through the large-hole filter plate and the filter screen, so that the problem that ears, chaff, husked grains and clean grains are mixed is solved, secondary separation of the grains and other impurities is avoided, the ear threshing time is greatly shortened, and the threshing efficiency is improved. And the contact time of the grain sample and the interference environment medium is reduced.

Method for preparing vanadyl sulfate

The invention provides a method for preparing vanadyl sulfate. According to the method, a technical process that ion exchange resin is adopted to selectively adsorb vanadium and reduce and desorb vanadium so as to directly prepare vanadyl sulfate is adopted, so that a middle process in which powder high-purity vanadium pentoxide is prepared is canceled. In addition, as the decontamination process is evolved into direct selective pure vanadium extraction, contamination and the labor and material consumption in the decontamination process are avoided, the operation procedure is greatly simplified. Compared with a conventional vanadyl sulfate preparation process, the method has the advantages of short procedure, high vanadium yield, low cost, no waste discharge and the like.

Minimum inflation high magnesium moderate heat cement, production method therefor and applications thereof

The invention discloses a kind of minimum inflation high magnesium moderate heat cement, a production method therefor and applications thereof. The cement is prepared from calcium raw materials, silicon materials, aluminum raw materials, iron raw materials, magnesium raw materials, correction raw materials and clinker activating agents through two-grinding and one-burning process. The content of MgO in the clinkers is raised to 6-9%, the content of periclase is controlled to 2-8%, the minimum inflation performance of periclase can be used fully, the contraction of mass concrete can be compensated, concrete cracks can be decreased, and therefore the volume stability and safety of concrete are raised.

Multifunctional rolling spoon needle therapy

The multifunctional rolling spoon needle therapy of the present invention consists of monoway spoon needle, handle, scraper, spoon needle holder, rolling spoon needles and roller. The monway spoon needle and the scraper are fixed onto the handle or spoon needle holder, the spoon needle holder connects the handle and the roller, and the roller connected to the spoon needle holder has several rolling spoon needles fixed on it.

High-performance small-caliber Cassegrain antenna

The high-performance small-caliber Cassegrain antenna comprises a metal surrounding edge, a main reflecting surface, an antenna cover, an auxiliary reflecting surface, a feed source and a plurality of supporting rods, the feed source comprises a round waveguide tube, a choke groove and a plurality of stages of conical radiation horns, one end of the round waveguide tube is connected with the inner side of the main reflecting surface, and the other end of the round waveguide tube is arranged opposite to the auxiliary reflecting surface; the choke groove is connected with the other end of the circular waveguide tube, and the plurality of stages of conical radiation horns are arranged in the circular waveguide tube; through the structure, the Cassegrain antenna has the advantages of being simple in structure and excellent in performance, can solve the problems that a splashing plate feed source is large in standing wave and complex in design, a medium is difficult to process when the Cassegrain ...

High-performance cement for construction in sea and preparation thereof

The invention discloses a high performance marine cement as well as a manufacturing method thereof, comprises the following compositions: clinker: 10 to 50 wt.%, slag: 20 to 60 wt.%, fly ash: 0 to 40 wt.%, sal micro-powder: 5 to 30 wt.%, and the sum of percentages is 100 percent. The product of the invention has advantages of seawater corrosion resistance, simplified construction process, convenient use, good construction performance and easy quality control, as well as reducing the construction time by over one third, expediting the construction progress, and reducing construction costs.

Be applied to not oxidized metal gas protection device of ball mill

The utility model provides a be applied to not oxidized metal gas protection device of ball mill, including the ball mill barrel, the ball mill barrel is rotatable barrel to be provided with processing material business turn over door, ball mill barrel one side pivot axis position is connected with the intake pipe, the intake pipe is used for letting in the not oxidized metal gas that pressure is greater than 1 standard air pressure, ball mill barrel opposite side pivot axis position is connected with the blast pipe. The utility model provides a be applied to not oxidized metal gas protection device of ball mill can make it at ball mill crocus in -process not by the oxidation by effectual protection ferrovanadium aggregate for the combustion synthesis success rate improves greatly.

Wear-resistant alloy steel liner plate material with high strength, and preparation method thereof

The invention discloses a wear-resistant alloy steel liner plate material with high strength. The wear-resistant alloy steel liner plate material comprises the following chemical elements by mass percent: 1.2-1.4% of carbon, 0.9-1.2% of silicon, 3.5-3.7% of manganese, 0.5-0.7% of boron, 2.1-2.3% of magnesium, 1.2-1.4% of tungsten, 0.7-0.9% of molybdenum, 0.04-0.07% of Sb, no more than 0.04% of S, no more than 0.04% of P and the balance of iron. The obtained alloy steel has good hardness, obdurability, distortion resistance, impact resistance, wear-resisting property and high-temperature resistance by using the elements such as tungsten, magnesium, stibium and the like. A part of scrap iron is used as a raw material, so that the alloy is more stable and even in quality by secondary refining, reasonably controlling the thermal treatment temperature after casting, and feeding the raw materials in batches, and the comprehensive mechanical performance is improved. A refining agent disclosed ...

Rotary compressor and bearing component thereof

The invention discloses a rotary compressor and a bearing component thereof. The bearing component comprises a bearing, a discharge valve plate, a lift limiter and an elastic piece, wherein an exhaust port is formed in the bearing, one end of the discharge valve plate is connected with the bearing, and the other end of the discharge valve plate covers the exhaust port; the lift limiter is arranged on the one side, away from the exhaust port, of the discharge valve plate, the elastic piece is arranged between the discharge valve plate and the lift limiter, and the part, corresponding to the exhaust port, of the elastic piece and the discharge valve plate are separated from each other. According to the bearing component, the bearing component is simple in structure. When the bearing component is applied in the rotary compressor, the falling back speed of the discharge valve plate is quickened under high-frequency revolving condition, the backflow of refrigerant gas is decreased, on the premise ...

Device and method for producing low-valence vanadium oxide

The invention relates to the technical field of vanadium oxide, in particular to a device and a method for producing low-valence vanadium oxide. The device for producing low-valence vanadium oxide comprises a combustion device, a cyclic decomposition reaction device and a cooling collection device. In the invention, the cyclic decomposition reaction device comprises a reaction pipeline, a recirculation pipeline and a dust removal device, and materials are decomposed and reduced for multiple times through the recirculation pipeline so that the materials are fully reduced, and low-valence vanadium oxide is obtained; according to the invention, ammonium metavanadate powder is used as a raw material; ammonium metavanadate powder is driven by high-temperature airflow generated by the combustiondevice to enter the cyclic decomposition reaction device to be decomposed and reduced, ammonia gas generated by the raw materials serves as a reducing agent to complete the reduction reaction process, ...

Ferrous vanadium nitride (FeV65N13) and synthetic method thereof

The invention provides a ferrous vanadium nitride (FeV65N13) and a synthetic method thereof. The ferrous vanadium nitride is composed of 63.0-67.0% of V, 12.0-16.0% of N and the balance of iron and few impurities in percentage by mass. The raw materials adopted include ferrous vanadium 80 (FeV80) and ferrous vanadium 50 (FeV50). A ferrous vanadium synthetic material powder is evenly mixed and then put in a graphite crucible in bulk, next, the graphite crucible is put in a high-pressure synthetic furnace, the amount of nitrogen needed is calculated according to the vanadium content of the synthetic material, high-purity nitrogen with the pressure of 7 to 12MPa is charged and ignited by using an ignition device to carry out a synthetic reaction, the pressure is maintained by introducing the high-purity nitrogen again when the nitrogen pressure is reduced to 6.5MPa until the combustion synthetic reaction is completed continuously, and no external heat energy needs to be supplied in the reaction ...