113results about How to "Wide application conditions" patented technology

The invention provides a road surface attachment coefficient and road surface gradient synchronous real-time estimation system and method for a hub-motor-driven vehicle. The road surface attachment coefficient and road surface gradient synchronous real-time estimation system comprises a wheel trackslip rate calculating module, a wheel side-slip angle calculating module, a wheel vertical force calculating module, a Dugoff tire model module for deformation treatment, an air resistance calculating module, a fading memory UKF parameter estimation algorithm module, a wheel longitudinal lateral force calculating module, a wheel rotating dynamics module and a longitudinal force feedback and correction module. According to the road surface attachment coefficient and road surface gradient synchronous real-time estimation method, through fading memory weighting processing on a traditional UKF algorithm, obsolete measured data of the algorithm are rejected in time, the weight of newly measured data is increased, and accordingly the estimation precision of parameters is improved; and the advantage that the torque of all wheels of the hub-motor-driven vehicle can be measured precisely is fullycombined, and accurate wheel longitudinal force information obtained by the wheel rotating dynamics module is utilized to correct wheel longitudinal force information obtained by a Dugoff tire model,so that the accuracy of longitudinal normalized force is ensured, and accordingly the estimation precision of the road surface attachment coefficient is improved indirectly.

The invention discloses an indoor mobile robot navigation system and method based on infrared landmarks. A monocular vision identification system collects an image of a luminous infrared landmark in an infrared landmark guidance system, and calculates the position of an indoor mobile robot relative to the current luminous infrared landmark through image processing; the indoor mobile robot is driven to move towards the luminous infrared landmark according to the relative position of the indoor mobile robot; after the indoor mobile robot enters the set area coverage of the current luminous infrared landmark, the monocular vision identification system issues a light emitting stop instruction to the current luminous infrared landmark, and issues a light emitting start instruction to next luminous infrared landmark; the monocular vision identification system makes the indoor mobile robot move to the next luminous infrared landmark according to the position of the next luminous infrared landmark, and so on; and the indoor mobile robot ends movement when moving to the set area coverage of the last luminous infrared landmark.

The invention relates to a method and device for estimating the queuing length of an intersection based on low-permeability vehicle track data, wherein the method comprises the following steps of S1:converting the original estimated data into a distance-time diagram, and recording the vehicle state of each track point in the distance-time diagram, wherein the vehicle state comprises a traveling state and a queuing state; S2: identifying queuing key points based on the change of the vehicle state, wherein the queuing key points comprise a queuing joining point and a queuing leaving point; S3:periodically dividing each queuing key point; and S4: estimating a queuing evanescent wave and a queuing formation wave, and obtaining a maximum queuing length. Compared with the prior art, the methodand device for estimating the queuing length of the intersection based on low-permeability vehicle track data has the advantages of wide application range and the like.

The invention discloses a low-complexity multivariate LDPC code decoding method, which comprises the steps of 1, initializing; 2, detecting signals; 3, judging whether the number of cycles reaches the preset maximum number of cycles or not, executing a step 4 if the number of cycles does not reach the preset maximum number of cycles, and otherwise, executing a step 5; calculating the checksum of a most likely estimation symbol sequence by a decoding stop module, executing the step 5 if the checksum is an all-zero vector, and otherwise, executing a step 6; 5, outputting a decoding result; 6, carrying out updating on information transmitted to check nodes by a variable node; 7, carrying out information updating by each check node; 8, carrying out updating on information transmitted to a detection node by the variable node; and 9, carrying out information updating by the detection node. The invention further discloses a low-complexity multivariate LDPC decoder. The method disclosed by the invention is simple in step, capable of meeting the requirements of high speed and high efficiency, capable of acquiring better decoding performance and wider application conditions, high in practicability, good in use effect and convenient for popularization and application.

The invention discloses a wall-type continuous mining and charging protection water mining and water resource migration monitoring and water damage early warning method. According to the method, a normal wall-type working face is divided into a 'mining-charging' exploitation block and a 'mining-reserving' exploitation block which are alternately arranged along a trend direction, coal pillars are not reserved among exploitation roadways in the 'mining-charging' exploitation block, roadways finishing tunneling are filled, narrow coal pillars are reserved among exploitation roadways in the 'mining-reserving' exploitation block, and roadways finishing tunneling are not filled. An infrared thermal imaging system is used for observing surface infrared radiation information of a mining space, anddynamic disasters such as filling body or narrow coal pillar instability are predicted. By the aid of a water resource migration monitoring and water damage early warning system, mining area water resource loss caused by coal mining and water damage easily occurring in a stope are comprehensively monitored, early warned and reasonably evaluated. The method widens applicable conditions of a protection water mining method, is a potential protection water mining method and has a wide application prospect.

According to the method, a vehicle kinematics model and a vehicle longitudinal dynamics model are constructed, after a continuous system is discretized, the road slope is estimated in real time based on recursive Kalman filtering, and a tire rolling resistance coefficient and an air resistance coefficient are estimated in real time based on extended Kalman filtering; and the vehicle longitudinal kinetic model is corrected in real time by utilizing the above parameter estimation values, and the vehicle mass is estimated in real time based on a recursive least square method with a forgetting factor. Compared with the mode of directly adopting the calibration values of the parameters to estimate the vehicle mass, the sensitive parameters in the vehicle dynamics model constructed in the method can be adaptively corrected according to the change of the road environment, so that the error between the set values of the sensitive parameters in the model and actual values is reduced; the accuracy and stability of the slope and vehicle mass estimation algorithm are effectively improved, the range of application conditions is wide, and a reliable road slope and vehicle mass estimation result is provided for a vehicle control system.

The invention provides an ionosphere propagation characteristic based phase diameter disturbance suppression method and belongs to the radar signal processing technical field. The problem that the suppression effect is limited and even fails when the disturbance suppression is performed on the ionosphere phase diameter by the existing ionosphere phase diameter disturbance suppression method from the perspective of signal processing is solved. According to the technical scheme, the Ionosphere propagation characteristic based phase diameter disturbance suppression method comprises performing the hybrid modeling on an international reference ionosphere model and an MQP (Multi-Quasi Parabolic) model to obtain an ionosphere space reflection time-varying parameter model; deriving a phase path calculation analytic expression of the MQP model by a ray tracing method on the basis of the electron concentration profile of ionosphere space reflection time-varying parameter model and obtaining change values of a phase path along with the time after the repeated operation at different moments; performing the suppression on the back wave spectrum with the ionosphere phase diameter disturbance through a phase disturbance compensation curve obtained through fitting by a least square method and finally obtaining the suppressed ionosphere back wave spectrum. The Ionosphere propagation characteristic based phase diameter disturbance suppression method is suitable for the processing on the broadening sea clutter spectrum with the ionosphere phase diameter disturbance under a high-frequency sky wave radar.

The present invention discloses a wind turbine airfoil design method combining a B spline with curvature smooth continuity, which considers the curvature smooth continuity of an airfoil profile surface and achieves airfoil profile control and parameter optimization under the condition of a multi-point design attack angle on the basis of establishing an airfoil B spline functional expression in the process of airfoil optimization design. According to the method provided by the present invention, in the continuously iterative optimization process of an airfoil, the characteristic of the curvature smooth continuity of the airfoil profile surface is constrained, so that the problem of no convergence of an aerodynamic force in the multi-point attack angle airfoil optimization design process can be well solved; the overall aerodynamic performance of the designed airfoil is significantly improved, so that the chord length of a blade is reduced, and a material required for the blade is lightened; due to the high overall aerodynamic performance, a wind turbine has a more wide applicable condition; and the method disclosed by the present invention can be popularized to design of wind turbine airfoils with various thicknesses, design of airplane airfoils and complete curve design of a turbine blade profile and the like, and has good societal value and economic benefits.

The invention belongs to the technical field of degradation of soil organic pollutants, and discloses a composite microbial preparation for degrading quinolones antibiotics and a preparation method and application. The preparation method comprises the steps of mixing quinolones antibiotics degradation bacterial liquid with energy supply bacterium bacterial liquid, magnetic medium bacterium bacterial liquid, a surfactant and a fermentation medium to obtain mixed liquid; and performing fermentation to obtain the composite microbial preparation for degrading the quinolones antibiotics. Energy supply bacteria which are adopted enable the composite microbial preparation to have high colonization and multiplication capacity in in-place edatope. The surfactant and the magnetic medium bacteria, which are adopted, enable the composite microbial preparation to have low moisture tension and antibiotics polarity. The prepared composite microbial preparation is high in activity, and high in environmental suitability. The composite microbial preparation is used for degradation of the quinolones antibiotics in soil, and is broad in scope of application and high in degradation efficiency.

The invention discloses a two-stage ejection refrigeration cycle system with an economizer, and the system provided by the invention comprises the economizer and a first expansion valve, wherein the first outlet of a generator is divided into two paths; one path is connected with a first inlet of a first ejector; the other path is connected with a first inlet of the second ejector; the gas outlet of the second ejector is connected with a condenser; the outlet of the condenser is divided into three paths, wherein the first path is connected with a first inlet of the economizer, and the second path is connected with the inlet of the first expansion valve; after the outlet of the first expansion valve and the gas outlet of the first ejector are connected into one path, the outlet of the first expansion valve is connected with a second outlet of the economizer; the third path is connected with the inlet of the solution pump; the outlet of the solution pump is connected with the first inlet of the generator; the first outlet of the economizer is successively connected with the second expansion valve, the evaporator and a second inlet of the first ejector in series; and the second outlet of the economizer is connected with the second outlet of the second ejector. According to the two-stage ejection refrigeration cycle system, the economizer and the first throttle valve are utilized to achieve higher performance coefficients and refrigerating capacity.

The invention discloses a riverbed non-dam type hydroelectric generation system, and relates to a hydroelectric generation system. The riverbed non-dam type hydroelectric generation system is used for solving the problems that an existing traditional hydropower station is high in manufacturing cost and large in work amount, a floating boat-type non-dam hydropower station can only be implemented in great rivers, the utilization rate of hydropower resources is relatively limited, and a tidal power station is high in construction cost, and cannot be utilized in a large-scale mode. The riverbed non-dam type hydroelectric generation system comprises a water turbine, a flow guiding body, a flow guiding plate, two right-angled-n-shaped frames, two bearing platforms, two power generation platforms, two generators, two increasing gear trains and two lifting mechanisms, wherein one bearing platform, one power generation platform, one generator, one increasing gear train and one lifting mechanism are installed on each right-angled-n-shaped frame, the water turbine comprises a rotary shaft and a plurality of bent blades, each power generation platform which is connected with the corresponding bearing platform is installed above the corresponding bearing platform, each generator is installed on the corresponding power generation platform, motors are connected with worm wheels respectively, and threaded rods are connected with the power generation platforms respectively. The riverbed non-dam type hydroelectric generation system is used for carrying out hydroelectric generation.

The invention discloses a method for synchronously removing nitrate and arsenic in underground water by natural pyrrhotite and an application of the method, and belongs to the technical field of water resource purification. The method includes the steps: (a) material preparation: crushing the natural pyrrhotite into particles and washing the particles into neutral with water after acid pickling; (b) strain screening: screening sulfur-based autotrophic denitrification bacteria taking the natural pyrrhotite as a sulfur source from anaerobic sludge by a specific screening medium to serve as a target strain; (c) sewage treatment: taking the underground water containing the nitrate and the arsenic, inoculating the target strain and then placing the underground water in a reactor containing the natural pyrrhotite for reaction; (d) solid-liquid separation. The natural pyrrhotite is used as the sulfur source of the sulfur-based autotrophic denitrification bacteria for denitrification, the nitrate in the water is transformed into nitrogen in a reductive manner, the pyrrhotite and oxidation product thereof can remove the arsenic in the water by the aid of functions such as chemical precipitation and adsorption, so that the nitrate and the arsenic in the underground water are synchronously and efficiently removed. The method is convenient in operation and low in cost.

The invention provides a face recognition system and method. The system comprises a processor, at least one infrared emitter and at least two infrared cameras. An infrared emitter is used for emittingstructured light to a face to be recognized when face recognition is performed; the infrared camera is used for receiving the structured light reflected by the face to be recognized, generating an image according to the received structured light pattern reflected by the face to be recognized, and sending the image to the processor. The processor processes the image, calculates the position information and the depth information of the feature points selected from each structured light pattern, and restores the 3D image of the face according to the position information and the depth information. The processor is further configured to extract facial features of the 3D image of the face, and compare the extracted facial features with the facial features of the face stored in advance to recognize the face. The processor is configured to extract the facial features of the 3D image of the face and compare the extracted facial features with the facial features of the face stored in advance. As such, the accuracy of face recognition can be improved, and the application conditions are wide.

The invention relates to the technical field of a biological deodorant, in particular to a composite microbial garbage deodorant and a preparation method thereof. The composite microbial garbage deodorant comprises the following components in percentage by mass: 10 to 30 percent of saccharomycete liquid, 20 to 30 percent of bacillus liquid, 30 to 40 percent of lactic acid bacterium liquid, 1 to 2 percent of photosynthetic bacterium liquid, 30 to 50 percent of water and the balance of molasses, wherein the bacterium number of the saccharomycetes is 0.5 to 2 billion pieces / ml, the bacterium number of the bacillus is 2 to 6 billion pieces / ml, the bacterium number of the lactic acid bacteria is 1 to 3 billion pieces / ml, and the bacterium number of the photosynthetic bacteria is 1 to 2 billion pieces / ml. The composite microbial garbage deodorant has diversified bacterial varieties, and can remove various stink and have wider application conditions; and the fermentation time is shorter, so that the production efficiency is greatly improved.

The invention discloses a wax cleaning and preventing bacterial agent and use thereof. The bacterial agent is prepared by combining wax clearing bacteria HP and L-510 and wax preventing bacteria UI-3, HT, Po and No.6. Experiments prove that the bacterial agent has good wax clearing and preventing effects and that when the medicine concentration is higher than 100mg / L, the wax preventing rate reaches over 50 percent; and the results of wax cleaning and preventing experiments of 4 wells on site prove the effective rate of the bacterial agent reaches 100 percent, that the medicine administrationperiod is prolonged to 10 to 28 days from 5 days, that the construction process is simple, small in dose, low in cost, economic and efficient, that the application of the bacterial agent to waxed wells are wide, and that the bacterial agent is applicable to almost all waxed wells. The bacterial agent is expected to play a great role in cleaning and preventing wax in field of oil exploitation and has a bright prospect.

The invention provides a preparation method of a keratin heavy metal adsorbent. The preparation method comprises the following steps: step I, cleaning and smashing a keratin raw material; step II, carrying out oxidation reaction on the ready keratin raw material: taking the keratin raw material, and putting the keratin raw material in an oxidant aqueous solution to carry out oxidation reaction, wherein an oxidant is a potassium monopersulfate composite salt or a sodium monopersulfate composite salt; and step III, carrying out reduction reaction on the oxidized keratin material: taking the oxidized keratin material, putting the oxidized keratin material in an aqueous solution containing a reducing agent to carry out reaction, and drying the obtained keratin material to obtain the keratin heavy metal adsorbent, wherein the reducing agent is one of sodium sulfite, sodium metasulfite, sodium bisulfite, potassium sulfite, potassium metasulfite and potassium bisulfate. The prepared heavy metal adsorbent has certain selectivity, is high in adsorption efficiency, low in cost, simple and convenient to operate, mild in required condition and does not generate secondary pollution.

The invention relates to a cable-stayed bridge forming cable force optimization method. The method is a cable-stayed bridge forming cable force optimization method based on a target tracking-iterativeupdating algorithm. According to the method, the midspan deflection of the cable-stayed bridge in the bridging state serves as a tracking target, a cable-stayed bridge model is established through anANSYS parameterized programming language, the bridging cable force of the cable-stayed bridge is optimized through an analysis method of tracking the midspan deflection and iteratively updating a real constant array, and the bridging state design requirement of the cable-stayed bridge is met. The method has the advantages that the requirements of design specifications of the cable-stayed bridge are more visually and specifically reflected, initial cable force is applied in a mode of endowing a unit real constant, bridging cable force is solved through a method of iteratively updating a cableforce real constant array of the inhaul cable, the program design is simple, complex correction calculation is not needed, and the calculation efficiency is improved. Moreover, the mutual influence between the cable forces of the stay cables of the cable-stayed bridge is considered, and the precision of optimizing the cable force of the finished bridge is improved by adopting a method of adjustingthe cables of the whole bridge.

The invention discloses a screen printing plate which comprises a plurality of warps and a plurality of wefts. The warps and the wefts are woven in an up-down staggered manner to form a plurality of openings, and the surfaces of the warps and / or the surfaces of the wefts are uneven. The screen printing plate has the advantages that screen printing application conditions can be expanded, and accordingly screen printing requirements on paste with low viscosity can be met.

The invention discloses a preparation method of a binding agent capable of restraining the swirling coal powder of a coal train, comprising the following steps: (1) the preparation of oxidized starch;(2) the preparation of the binding agent. The preparation method has the advantages that the product adopts lignin sulfonate which is salvaged material in papermaking industry, corn starch, sodium hydroxide and hydrogen peroxide to prepare the binding agent capable of restraining the swirling coal powder of a train used for transporting coal; the product has no corrosivity, volatility, non-hydrophilic property and hard-degradation. The product has good permeability and spreadability, long curing duration, strong wind erosion resistance and water erosion resistance, cheaper price and better performance compared with similar products, low dosage, high bonding efficiency, no secondary pollution, short production cycle, simple usage, easy transportation and storage and wide applicability. Thebinding agent can form a curing layer which can not be peeled off when the train is in movement so as to reach the aim of preventing the coal powder to fly and reduce the loss of coal in transit. Themethod has simple operation, can save time and labor, and has low cost.

The invention discloses an ultrasonic detecting system and method. The ultrasonic detecting system is used for detecting lithium batteries and comprises a detecting portion, a transmitting portion, a sorting mechanism, wherein the detecting portion is used for detecting swelling of the lithium batteries, the transmitting portion is used for bearing and moving the lithium batteries, the transmitting portion is further connected with the detecting portion, and the sorting mechanism is arranged above the transmitting portion, connected with the detecting portion and used for sorting the lithium batteries with the swelling. The ultrasonic detecting system has the advantages and the beneficial effects of achieving a non-contact type ultrasonic detecting effect and having high flexibility, strong penetrating power, good directivity, quick detecting speed, low cost, relatively simple equipment and no harm to a human body. The ultrasonic detecting system also has the advantages of avoiding coupling agent, keeping longer distance with an object to be detected, having a simple and convenient detection process, improving the automation degree of lithium battery detection, greatly saving labor consumption of a battery swelling detecting process, reducing production cost, being beneficial to solving the problem that the efficiency and the accuracy are not high in manual product detection and greatly improving the production efficiency.

The invention provides transparent photocuring ink for 3D ink-jetting printing and a preparation method thereof. The transparent photocuring ink for 3D ink-jetting printing comprises acrylate monomers, sulfhydryl compounds, surfactants, photoinitiators and assistants. The transparent photocuring ink for 3D ink-jetting printing has the advantage of capability of inhibiting proneness to yellowing, muddiness and obscurity of printed products.

The invention discloses a mobile station-type outdoor power distribution cabinet. The mobile station-type outdoor power distribution cabinet comprises a steel shell and a support steel plate, whereinan acrylic acid waterproof coating layer is arranged on an outer surface of the steel shell, a Y-shaped support is arranged on the steel shell, solar cell panels are arranged at two top ends of the Y-shaped support, a first steel rack is arranged in the steel shell, a circuit breaker is arranged on a front end surface of the first steel rack, a second steel rack is arranged below the circuit breaker, a contactor is arranged on a front end surface of the second steel rack, a third steel rack is arranged below the contactor, a cooling fan is arranged below the third steel rack, a storage batteryand an AM2120 temperature / humidity sensor are arranged at an upper end of the steel shell, the steel shell is connected with a cabinet door via a chain, a liquid crystal display is arranged on an inner wall of the cabinet door, and a control button plate is arranged below the liquid crystal display. The mobile station-type outdoor power distribution cabinet can move, can be used for performing power distribution for a certain place at any time and at any place and is high in comprehensiveness and wide in application range.

The invention discloses a prediction and early warning method and system for an overhead transmission line galloping risk. The system can comprise a data acquisition unit, a training sample screeningunit, a prediction model optimization unit, a galloping risk prediction unit and a galloping risk early warning unit. The method includes: on the basis of collecting ontology data and meteorological data of a power transmission line, firstly inputting original sample data into a training sample screening unit, and selecting a historical data sample set similar to a to-be-predicted historical datasample set based on a weighted grey correlation projection method; Secondly, training a dancing risk prediction model through the similar historical data sample set, and selecting the optimal decisiontree number of the model and the feature number of the split feature set to complete the establishment of the dancing risk prediction model; Then, outputting a galloping risk prediction level at a galloping risk prediction unit; And finally, based on the galloping risk prediction level, releasing corresponding galloping risk early warning information in a galloping risk early warning unit.

The invention discloses an asymmetrical vortex control device for an aircraft forebody. The device comprises air blowing ports symmetrically arranged at two sides of a leeward area of the aircraft forebody and an oscillating jet device; the oscillating jet device comprises a wall-attached oscillating jet element, a main jet source and a control device; the wall-attached oscillating jet element comprises a jet inlet, a nozzle, a splitter plate, two jet direction deflection control ports and two jet outlets; the main jet source is connected with the jet inlet of the wall-attached oscillating jet element; the air blowing ports are connected with the two jet outlets of the wall-attached oscillating jet element respectively; and the two jet direction deflection control ports of the wall-attached oscillating jet element are connected with the control device respectively. The invention also discloses an asymmetrical vortex control method for the aircraft forebody. The asymmetrical vortex of the aircraft forebody is disturbed by oscillating jet, so that the strength or the position of the asymmetrical vortex of the aircraft forebody is changed. The device has the advantages of simple structure, good instantaneity, no influence on the shape of an aircraft and the like.

The invention discloses a wave-equation first-arrival travel-time chromatography method taking a reverse-time migration algorithm as an engine. The method comprises the following steps of inputting a seismic wavelet, observing a system, carrying out depth-domain initial speed field and observing a first-arrival travel time of a seismic record and a minimum value of a travel-time residual error norm; using an acoustic wave equation forward modeling method to calculate a forward-modeling simulated seismic record in an initial speed field and solving a wave equation; calculating primary wave arriving time of the simulated seismic record; calculating a primary wave travel time residual and determining whether a norm of the travel time residual is less than a preset precision requirement; calculating a wave equation travel time sensitivity matrix; solving a tomographic linear equation group; updating a speed model; and outputting the speed model obtained through inversion. The method has advantages that the acoustic wave equation is used so that a high inversion resolution is possessed; the method is suitable for describing a forward scattering phenomenon of a wave field; and a wave equation chromatography is used in a primary wave travel time tomography so that a high-precision background speed inversion method is acquired and a large-scale macroscopic background speed field can be inverted.

The invention provides a gob-side entry retaining system for cementing gangue in a gob-side goaf into a wall. A first hydraulic jack is hinged on a hydraulic support tail beam at the end of a workingface; one end, close to the goaf, of the first hydraulic jack is connected with a first gangue baffle; a second hydraulic jack is hinged to the side, close to the goaf, of an entry retaining support;one end, close to the goaf, of the second hydraulic jack is connected with a second gangue baffle; the second gangue baffle is positioned behind the first gangue baffle; the second gangue baffle abutsagainst the first gangue baffle and encloses an entry retaining operation area; and a grouting pump station injects a high-water filling material into the entry retaining operation area through a grouting pipe. According to the gob-side entry retaining system for cementing the gangue in the gob-side goaf into the wall, collapsed gangue in the goaf can be fully utilized, the working face can be immediately followed, the entry retaining by cementing into the wall is finished, the goaf and a gob-side roadway can be isolated all the time, the cost is low, and the adaptability is high. The invention also provides a gob-side entry retaining method for cementing the gangue in the gob-side goaf into the wall.

The invention relates to a honeycombed steel box concrete wallboard module, a manufacturing method for the honeycombed steel box concrete wallboard module and a wall body spliced and built by the honeycombed steel box concrete wallboard module and is suitable for building external walls for bearing water-earth pressure in the underground engineering and plate-shaped structure members in a pressure bending stress state in other buildings. The honeycombed steel box concrete wallboard module is of a honeycombed steel box concrete combination structure, can simultaneously bear the loads inside and outside a plane, is large in rigidity and strong in ability of bearing complex load, is not limited by the reinforcement ratio and the axial compression ratio of reinforced concrete members and can be used for members which bear heavy loads. Modular construction of wallboards of a basement is realized, the concrete wallboard modules can be freely combined into the wall body with different sizes according to different construction conditions and requirements, can be used for constructing the wall body with a rigid corner and is wide in application range. As being in factory production, the concrete wallboard module is high in quality and little in influence on the surrounding environment of a construction site. The wallboard modules can be rigidly connected with one another, so that a seam is simple, convenient and reliable, and the waterproof property is good.

The invention provides a Bacillus catonella strain DM4-2 with inhibiting effect on plant scab as well as a fungicide and an application thereof, the strain DM4-2 is preserved in China Center for Type Culture Collection on January 7, 2021, and the preservation number is CCTCC M 2021026. According to the invention, an antagonism experiment proves that the strain has a relatively strong inhibition effect on Streptomyces scabies. The invention provides an application of the fermentation liquor of the strain in preventing and treating potato scab. Experiments prove that the strain can significantly improve various physiological indexes such as root activity, antioxidant enzyme system and the like of potato plants, and also significantly improve the activity of soil urease, thereby the nitrogen supply capacity of soil is improved. According to the present invention, the Bacillus catonella DM4-2 has strong inhibition effect on S.scabies, which can be prepared into the biocontrol agent for preventing and treating potato scab, and has important market application prospects.

The invention relates to a course error compensation method for a platform compass on a ship under a circumstance that external course standard information exists. An error compensation program can be started if a course error |delta k| is more than 0.15 degree and external course standard information exists after the platform compass stably works for 2 hours as normal, so as to control the |delta k| within 0.15 degree through rapid correction; temporary increment current is continuously applied on a bearing torquer of a north gyroscope, and simultaneously increment current is continuously applied on a horizontal torquer of the north gyroscope, wherein duration of applying the increment current and the temporary current is t; the error compensation is up to a requirement when the duration t meets a formula delta T=delta k / 3 / h, and then the temporary current on the bearing torquer of the north gyroscope is canceled. The course error compensation method for the platform compass disclosed by the invention can rapidly, stably and accurately realize course error compensation in an automatic manner with change in azimuth of main shaft of the gyroscope only; the compensation process is free from influence on variation of an attitude angle, so as to avoid a horizontal attitude error.

The catalyst system for catalyzing propylene dimerization to prepare C6 olefin consists of either di(salicylal imine) nickel(II) and organic aluminium compound, or di(salicylal imine) nickel(II), organic aluminium compound and organic phsphine. The catalyst system of di(salicylal imine) nickel(II) and organic aluminium compound has catalytic activity up to 60000-120000 mol C3-- / mol Ni. hr, dimerization selectivity of 70-90 %, methyl amylene content in dimerized product up to 80 %. The catalyst system of di(salicylal imine) nickel(II), organic aluminium compound and organic phsphine has catalytic activity up to 240000 mol C3-- / mol Ni. hr, C6 olefin selectivity up to 90 % and 2, 3-dimethyl butene selectivity up to 64 %.