120 results about "Balance problems" patented technology

The invention discloses a method for selecting a CoMP downlink cell cooperation set in an LTE-A system, which mainly solves the balance problem between signaling and feedback overhead required for cooperation and performance gain of the system. The method comprises the following steps of: (1) calculating signal-interference-noise ratios (SINR) of all users in a cell, and screening a user set for CoMP according to the SINR threshold; (2) picking CoMP users i to be served according to a proportional fair algorithm, and recording the service cell of the users as j; (3) selecting a candidate set according to the positions of the users i in the service cell j; (4) determining types of the users i according to the reference signal receiving power of the users i; and (5) selecting different cooperation set selecting methods according to the types of the users i. The method can reduce the scheduling complexity at the same time of ensuring the throughput gain of the system, meanwhile, optimizes the performance of two modes by adopting the different cell cooperation set selecting methods for the users in the two modes of CoMP SU-MIMO and CoMP MU-MIMO respectively, and can be used for selecting mutually cooperative cells under cooperative multi-point transmission technology.

The invention relates to the network safety technology, discloses a deep message detection method, network equipment and system. The method includes: receive the data message in the data stream; determine whether the data message required to be detected or not, if yes, firstly identify the data message; if can't be identified, then copy the data message, and send one copy of the data message to the deep message detection device, that is, the DPI detection device for deep message detecting. The invention may solve the balancing problem between the DPI detection and rapid data forward performances, meet with the sensing and controlling demand of network operator for the internet services, save the network resources.

The present invention provides a body lift-assist walker device for gait training is provided by the invention. The patient wears a pressurized body suit over all or a portion of his lower body, and the suit is attached to the walker device. A positive pressure or vacuum condition is applied to the interior of the suit, so that the differential pressure condition across the suit offloads a portion of the patient's body weight to the ground through the supportive walker device to make it easier for him to walk or run. The walker device also includes a lift-assisted body weight support device operated by a constant force mechanism like a pneumatic air cylinder that can lift the patient from a sitting position to a standing position with minimal physical effort. The device provides a portable and convenient system for persons undergoing physical therapy for treatment of gait or balance problems following an injury, stroke, or neurological disorder, or for use by elderly or disabled persons who have encounter difficulties in the sit-to-stand movement or walking.

The invention belongs to the related technical field of factory virtual simulation, and discloses a mixed flow assembly workshop rapid reconstruction method and system based on digital twinning, and the method comprises the following steps: (1) building a digital twinning workshop model of a mixed flow assembly workshop; (2) solving the design and balance problems of the mixed flow assembly line by adopting the constructed mixed flow assembly line simulation model so as to obtain an optimal assembly station task allocation scheme; A built material storage area simulation model is adopted to solve and obtain an optimal batching area storage position material distribution scheme, and then a test is designed on the basis of the optimal assembly station task distribution scheme and the optimalbatching area storage position material distribution scheme so as to obtain an optimal material distribution system scheme through solving; And (3) carrying out simulation verification and manual inspection adjustment on the mixed flow assembly workshop reconstruction scheme obtained in the step (2) by adopting the digital twin workshop model to obtain an optimal reconstruction scheme. The methodis high in efficiency, use and flexibility, and reconstruction efficiency is improved.

The invention discloses a self-adaptive robust control method for a nonlinear bilateral teleoperation system. For a communication time delay problem of the bilateral teleoperation system, by online estimating a non-power environmental parameter of a slave end via a radial basis function neural network model and transmitting the non-power environmental parameter back to a master end to reconstructan environmental force, the passivity of the teleoperation system as well as the balancing problems of stability and transparency is prevented. For problems of nonlinearity and uncertainty of the bilateral teleoperation system, a track generator, and a nonlinear self-adaptive robust controller based on a radial basis function neural network are respectively provided at the master and slave ends, and based on a Lyapunov theory, a self-adaptive rate for online adjusting a neural network parameter is designed, so that the system is guaranteed to have good asymptotic stability and convergence. Theself-adaptive robust control method can guarantee the global robust stability of the nonlinear bilateral teleoperation system well, implements the position tracking of a robot at the slave end, and provides a vivid force feedback for an operator.

The present invention relates to an internet picture transparent and safe transmission method based on chaotic encryption, and provides a chaotic digital image encryption transmission solution scheme which supports the automatic generation of a secret key and is fully transparent to the internet user operation. According to the internet picture transparent and safe transmission method based on the chaotic encryption, a browser client utilizes a JavaScript program to automatically map, calculate and obtain two key Logistic chaotic secret key parameters according to the information, such as the usernames, password Hash values, etc. inputted by the internet valid users, to realize the safe and transparent encryption and transmission on the to-be-uploaded pictures of users; a server terminal can query a user database according to the registered username to obtain the password Hash value of a user, so that a same chaotic random sequence can be obtained, and finally the encrypted pictures uploaded by the user can be decrypted; on the contrary, when the user registers validly to require the server pictures, the JavaScript program can automatically carry out the chaotic secret key parameter calculation and chaotic decryption operations at a browser terminal. According to the scheme of the present invention, the balance problem among the security, the encryption efficiency, the secret key management and the like of the internet picture transmission can be solved effectively.

The invention discloses a determination method for maximum stress of a large-turning angle circular membrane under a uniformly distributed load. The determination method comprises the following steps of fixedly clamping a non-prestressed membrane of which the Young's elastic modulus is E, the Poisson's ratio is V and the thickness is h by using a clamping device of which the inner radius is a to form a circular membrane structure of which the radius is a and the periphery is fixedly clamped, and transversely applying the uniformly distributed load q to the circular membrane to enable a turning angle theta after the membrane deforms to be greater than 20 degrees, so based on the accurate analysis on the static balance problem of the axisymmetric circular membrane, by utilizing a load measured value q, the maximum stress sigmam generated after the membrane deforms can be determined.

The invention provides a bean pulp rainbow trout parr compound feed and a preparation method thereof. Every 100kg of bean pulp rainbow trout parr compound feed is manufactured by 10 to 15kg of steam fish meal, 45 to 55kg of full fat expanded soybean, 10 to 15kg of corn protein powder, 2 to 5kg of isolate soya protein, 3 to 5kg of beer yeast, 0.5 to 1.0kg of Squid paste, 0.5 to 1.0kg of betaine, 3 to 6kg fo flour, 1.5 to 2.5kg of soybean lecithin, 2 to 3kg of fish oil, 2 to 3kg of soybean oil, 0.3 to 0.5kg of methionine, 0.1 to 0.3kg of lysine, 0.3 to 0.5kg of Choline Chloride, 0.5 to 1.0kg of composite vitamin, 0.5 to 1.0kg of composite mineral salt and water. The invention aims at the digesting physiological characteristic during the parr period of the rainbow trout and solves the balancing problem of amino acid by optimizing and adjusting the prescription of the feed, and solves the problems of anti-nutritional factors and palatability by comprehensively using enzyme preparation and feeding promoting agent. The feed of the invention has the advantages of remarkably promoting the quick growth of the rainbow trout parr, improving the surviving rate of the rainbow trout parr, improving the digesting and absorbing rates of the rainbow trout parr on the feed, reducing the drainage of P and N, reducing the culturing cost, and the like.

The invention discloses a design method for a convex combination self-adapting filter based on minimum error entropy, and belongs to the field of treatment of signals. The design of the traditional self-adapting filter based on the minimum mean square error rule only can achieve good effect in the case that system noise is Gaussian, but is non-ideal in performance in the case of non-Gaussian noise. Although the self-adapting principle based on minimum error entropy can overcome the defect of non-ideal performance in the case of non-Gaussian noise, but still can not simultaneously achieve optimal effects on convergence rate and steady accuracy as facing a balancing problem therebetween. According to the design method for the convex combination self-adapting filter based on minimum error entropy, the two self-adapting filters based on minimum error entropy are combined, so that the designed convex combination self-adapting filter based on minimum error entropy still can implement abilities of rapid converging and tracking in the case of keeping good steady accuracy, and is more prone to popularize and use in practical application.

The invention discloses a model for forecasting multi-dimensional flux migration and transformation of fertilizer urea nitrogen in paddy fields, mainly considering destination balance problem of fertilizer nitrogen, emphasizing effects to water environment, and protruding the migration of the fertilizer nitrogen to surface water and groundwater. The method is formed by coupling a water balance module and a nitrogen balance module. The nitrogen balance module comprises the nitrogen transformation processes such as urea hydrolysis, ammonia volatilization, nitrification, denitrification, fixing, mineralization, absorption and the like; the water balance module comprises the processes such as infiltration eluviation, lateral seepage and radial flow (containing drainage). The model disclosed by the invention can comprehensively simulate the effects of the nitrogen to the water environment during migration and transformation in the paddy field by using few parameters.

The invention provides a bean pulp rainbow trout parr compound feed and a preparation method thereof. Every 100kg of bean pulp rainbow trout parr compound feed is manufactured by 6 to 12kg of steam fish meal, 50 to 60kg of expanded bean pulp, 10 to 15kg of corn protein powder, 3 to 5kg of beer yeast, 0.5 to 1.0kg of Squid paste, 0.5 to 1.0kg of betaine, 2 to 6kg fo flour, 1.5 to 2.5kg of soybean lecithin, 5 to 6kg of fish oil, 5 to 63kg of soybean oil, 0.3 to 0.5kg of methionine, 0.1 to 0.3kg of lysine, 0.3 to 0.5kg of Choline Chloride, 0.5 to 1.0kg of composite vitamin, 0.5 to 1.0kg of composite mineral salt and water. The invention aims at the digesting physiological characteristic during the parr period of the rainbow trout and solves the balancing problem of amino acid by optimizing and adjusting the prescription of the feed, and solves the problems of anti-nutritional factors and palatability by comprehensively using enzyme preparation and feeding promoting agent. The invention selects the feed materials with high biological availability, and has the advantages of remarkably promoting the quick growth of the rainbow trout parr, improving the surviving rate of culturing, improving the digesting and absorbing rates of the rainbow trout parr on the feed, reducing the drainage of P and N, reducing the culturing cost, and the like. The materials used by the compound feed of the invention have the advantages of reliable source, stable quality and low cost.

The invention discloses an oil balance system for a plurality of compressors. The invention comprises at least two parallelly connected compressors, an oil container communicated with oil drain pipes of the compressors, wherein the top of the oil container is communicated with inlet pipes of the compressors; the bottom of the oil container is connected with all inlet pipes of the compressors through oil return pipes. The aim of the invention is to provide an oil balance system for a plurality of compressors, which is used for resolving oil balance problem among the plurality of compressors.

The invention discloses a determination method for elastic strain energy of a large-turning angle circular membrane under a uniformly distributed load. The determination method comprises the following steps of fixedly clamping a non-prestressed membrane of which the Young's elastic modulus is E, the Poisson's ratio is v and the thickness is h by using a clamping device of which the inner radius is a to form a circular membrane structure of which the radius is a and the periphery is fixedly clamped, and transversely applying the uniformly distributed load q to the circular membrane to enable a turning angle theta after the membrane deforms to be greater than 20 degrees, so based on the accurate analysis on the static balance problem of the axisymmetric circular membrane, by utilizing a load measured value q, the elastic strain energy generated after the membrane deforms can be determined.

The invention provides a hydrogen permeability testing device for a metal material under high liquid pressure, and belongs to the technical field of hydrogen permeability testing for materials. The device comprises an autoclave, an electrochemical workstation, a hydrogen charging device, a metal sheet specimen, a reference electrode, an auxiliary electrode and a thermocouple thermometer, wherein a high-elasticity film is embedded into an upper cover of the hydrogen charging device through a perforated plug valve, so that the elasticity of the film is utilized to eliminate the internal and external pressure difference, the liquid pressure intensity in a hydrogen charging chamber and a hydrogen diffusion chamber in the testing process can be kept balance, and meanwhile the two different liquids can be prevented from mixing. Therefore, the pressure intensity balance problem of different liquids in the hydrogen charging chamber and the hydrogen diffusion chamber under the high pressure can be solved; the device can be used for measuring the hydrogen permeability signals in the metal material electrochemical hydrogen charging process under the high liquid pressure; the anodic current density ia-time curves of various metal materials in the electrochemical hydrogen charging process under different liquid pressures, different temperatures and different hydrogen charging current densities can be tested and recorded, so that the material hydrogen induced cracking sensitivity can be further analyzed and evaluated through data processing.

The invention relates to a robot real-time simulation method. The robot real-time simulation method comprises the steps of: obtaining all joint positions for human body actions, calculating direction vectors between adjacent human body joints by using all the joint positions for human body actions, and matching the direction vectors between the adjacent human body joints with corresponding direction vectors between adjacent robot joints to obtain a target angle needing to be moved by a robot. The technical scheme maps human body information detected by a sensor onto the robot and enables the robot to perform similar actions through applying kinematic inverse solution and LP optimization methods and using a Bezier curve fitting trajectory, and meanwhile, can consider the balance problem so as to enable the robot to simulate other high-difficulty actions. The method is simple in operation, relatively low in cost and high in stability.

The invention discloses a hydrocracking bifunctional catalyst and a preparation method thereof. A hydrogenation function in the catalyst is achieved by an active center composed of noble metal and non-noble metal, and a cracking function is achieved by an acid site on the surface of a catalyst carrier composed of a modification Y molecular screen, an SBA-15, magnesium oxide or boric acid, aluminium oxide and kaolin through pinching in a mixing manner; and the catalyst is characterized in that the noble metal and the non-noble metal can form a hydrogenation activity centre according to the proportion, surface acid concentration and acid strength are adjustable by controlling each component mixture ratio and a preparation process, the balance problem of the hydrogenation function and the cracking function in a hydrocracking reaction process is effectively solved, activity, selectivity, anti-carbon capability, antitoxic capability, and hydrogen consumption of the catalyst are improved, and the service life of the catalyst is prolonged. The catalyst is used for an overhydrocracking reaction of heavy fraction oil and biomass heavy oil.

The invention relates to a counterweight automatic synchronous mobile mechanism of an amplitude boom tower crane, which is connected with a balancing arm; the undersurface of the front end of the balancing arm is articulated with the top of the tower; the upside of the front end is articulated with an arm frame; a parallel four-bar linkage is composed of a rocking bracket, a shipper rod and a transitional joint lever by means of the balancing arm through the mobile mechanism; wherein, the back end of the rocking bracket is articulated with the back end of the shipper rod; the counterweight is positioned at the central position of the articulating point; the front end of the rocking bracket is hinged with the hinder part of the balancing arm; the front end of the shipper rod is articulated with the rear end of the transitional joint lever; the front end of the transitional joint lever is fixed and connected with the arm frame; the lower end of a supporting rod at the center of the transitional joint lever is fixed and connected with the transitional joint lever; the upper end of the supporting rod is fixed and connected with the arm frame at the trail of the arm frame. In the process of the amplitude of the arm, the counterweight automatic synchronous mobile mechanism of the amplitude boom tower crane has the advantages that the counterweight is moved synchronously, thus leading a suitable automatic adjustment for a balancing moment as the pitching of the arm frame and effectively solving the balancing problem of a large amplitude boom tower crane.

The invention relates to a method for improving the stability of a die-molded composite door panel, which comprises the following four steps of: 1, selecting materials, to be specific, selecting a piece of melamine decorative paper and a middle-density fiberboard as materials for producing the die-molded composite door panel; 2, softening the middle-density fiberboard by spring an ammonia or urea solution; 3, limiting the depth and height of patterned fluctuation as well as a curvature radius of the patterned fluctuation transition of a mold; and 4, selecting a hot press for simultaneously closing multiple layers, setting high temperature and low temperature for press plates of the hot press at intervals one by one in die molding, doing different arrangements on a pavement sequence of raw materials on a high-temperature press plate and a low-temperature press plate, and giving special parameters to a closing speed, pressure, pressure holding time and pressure reduction speed in the pressurizing process so as to solve the stress balance problem of the die-molded composite door panel on different aspects. According to the invention, a set of feasible method is provided to guarantee the flatness of the die-molded composite door panel, reduce the fracture damage and guarantee the product quality.

The invention discloses a carrying device for warehouse goods transportation. The carrying device comprises a car body, an installation plate is fixedly connected to the front side of the car body, a top plate is fixedly connected to the upper surface of the installation plate, two sliding rods are fixedly connected to one side of the lower surface of the top plate, and arranged symmetrically with the center line of the top plate being a symmetric line, the surface of each sliding rod is sleeved with a sliding bush, a forked hook is fixedly connected to the surface of each sliding bush, and two bearings are clamped to the other side of the lower surface of the top plate. By arranging an expansion device, a shell, a pushing rod, a baffle, a spring and a pressing device, when the forked hooks are used for lifting articles, the articles move upwards along with the forked hooks, the upper surfaces of the articles and the lower surface of the pressing device extrude each other, the forked hooks and the pressing device clamp the articles, in this way, the articles are more stable when being lifted and transported, and it is avoided that slant is generated due to a balance problem, or forward bending is generated by inertia.

The invention relates to the technical field of electricity side bidding optimization, in particular to a bidding optimization method considering cross-region consumption of renewable energy sources.The method comprises the following steps of 1, building cost models of a non-renewable energy resource power station and a renewable energy resource power station in cross-region consumption; 2, building quotation models of the non-renewable energy resource power station and the renewable energy resource power station in cross-region consumption; 3, building income models of day-ahead markets of the non-renewable energy resource power station and the renewable energy resource power station in cross-region consumption; 4, building income models of intra-day markets of the non-renewable energy resource power station and the renewable energy resource power station in cross-region consumption; 5, judging whether ultra-high-voltage line supply and demand meet an ultra-high-voltage line supply and demand balance constraint condition or not; and 6, solving a balance problem with a balance constraint. According to a simulation result, the incomes are maximized by changing corresponding quotation parameters; the consumption level of the renewable energy source power station is improved through the ultra-high-voltage line; and both the non-renewable energy resource power station and the renewable energy resource power station achieve relatively high incomes.

The invention discloses a quantitative and divisional drill hole arrangement optimization method based on coal mine gas extraction production prediction. The quantitative and divisional drill hole arrangement optimization method comprises the following steps that a critical value of reaching the standard of mine gas extraction is determined; the relation between the effective extraction radius and the extraction time is obtained; according to the linkage deployment and roadway tunneling time and roadway stopping time of working face pumping-digging-extraction, the longest pre-pumping time and shortest pre-pumping time of working face extraction drill holes are determined; a quantitative and divisional drill hole arrangement optimization scheme is achieved according to an obtained result. The linkage balance problem of pumping, digging and extraction of coal seam gas to be pumped can be solved, the relation between the pre-pumping time and a drill hole separation distance is researched based on coal mine gas extraction production prediction, and meanwhile quantitative and divisional optimization of pumping and extraction drill hole arrangement parameters is achieved from the spatio-temporal perspective by combining with the mine pumping and extraction linkage relation.

The invention discloses a synchronization method for parallel-connection operation control of multiple energy storing devices of a microgrid. The method includes a control policy for microgrid transference from connected network to isolated network, a control policy for microgrid transference from isolated network to connected network and a microgrid isolated-network operation control policy so that a problem of asynchronization of the multiple energy storing devices in transference from connected network to off-network and from off-network to connected network, a ring current problem brought up because differences of the energy storing devices in voltage amplitude and phase angle in operation of the microgrid isolated network and a current balance problem of the energy storing devices in the operation of the microgrid isolated network to be solved effectively so that stability of the microgrid isolated network in operation is improved. In the synchronization method, energy-storing system control is effectively simplified in the operation of the microgrid isolated network through transference of closed-loop points so that the control policies have great universality, practicality and application prospect.

A sander according to the present invention comprising a housing, a motor and a transmission mounted within the housing, a sanding plate mounted below the housing, a battery pack mounted at the rear end of the housing and a balance means mounted on either the housing or the sanding plate. The balance means includes a balance element disposed in the front part of the sander. The balance element is balanced with the battery pack, which solves the balance problem of the DC sanders known in the prior art while still providing a battery pack that can satisfy the power requirements of the sander.

The invention discloses a balancing method based on the probability nerve network and applied to a visible light communication system. The balancing method in a visible light system is analyzed, and a balancing problem is converted into a classification problem. Under the Bayes optimum criterion, the probability nerve network is introduced as a balancer, through mode unit substitution and probability density function estimation, channel output state estimation is avoided, system channel state evaluation complexity is reduced, interference among symbols can be better inhibited, and bit error rate performance of the visible light communication system is improved. Considering the channel complexity, decision feedback is introduced to an originally-proposed new balancer scheme, performance improvement for the original balancer is verified through simulation.

The invention provides a microgrid capacity allocation optimization method considering risk losses. The method includes obtaining parameters, and fitting out the probability distribution function of wind, photovoltaic and load power; constructing wind-photovoltaic-load uncertainty sets of multiple sections, and calculating risk power; constructing a two-stage robust optimization model of power capacity configuration, and performing decoupling into a main problem module and a subproblem model; and utilizing a column and constraint generation algorithm to obtain the optimal configuration of thecapacity of a microgrid. The method can solve the capacity allocation scheme of the microgrid, so that the risk losses of the capacity allocation scheme of the microgrid can be reduced, and the balance problem of economy and robustness can be solved; and the configured microgrid within planning years has good robustness and economy and gives the risk loss range of the scheme, so that the method has reference and guidance values for the future operation mode of the microgrid, and necessary technical support can be provided for the planning work of the microgrid.