108 results about "Solidity" patented technology

A turbofan includes a row of fan blades extending from a supporting disk inside an annular casing. Each blade includes an airfoil having opposite pressure and suction sides extending radially in span between a root and tip and axially in chord between leading and trailing edges. Adjacent airfoils define corresponding flow passages therebetween for pressurizing air. Each airfoil includes stagger increasing between the root and tip, and the flow passage has a mouth between the airfoil leading edge and the suction side of an adjacent airfoil and converges to a throat aft from the mouth. The row includes no more than twenty fan blades having low tip solidity for increasing the width of the passage throat.

The present invention relates to a three-dimensional printing prototyping system which includes a prototyping chamber having a prototyping table capable of moving up and down by a predetermined range, a material containing chamber containing a powder material and having a material supply table capable of moving up and down by a predetermined range, and a material supplying means for supplying the powder material contained in the material containing chamber to the prototyping table as much as a sectional thickness corresponding to divided section data of a three-dimensional prototype to be prototyped. The system of the present invention comprises a printing head for injecting a photocuring adhesive material to a region, corresponding to the sectional data, on the powder material supplied to the prototyping table; a curing device for photocuring at least the region on which the adhesive material is injected; and a control computer for controlling the printing head and the curing device such that the adhesive material is injected and cured, respectively, on the region corresponding to the divided section data of the three-dimensional prototype. According to the present invention, a period of time required in curing a three-dimensional prototype can be remarkably shortened and the three-dimensional prototype with its superior solidity can be obtained.

A web can comprise a substantially continuous fiber mass and a separation means dispersed into the fiber. The web having a preferred thickness resulting from forming a polymer material and a particulate into a fine fiber layer can have a variety of end uses. A filtration media can include a structure comprising such a web of fine fiber and a substantial volume of particulate embodiment of the separation means. The resulting fine fiber structure provides an improved filtration medium having substantial depth, thickness, and a layered structure. The improved properties of the web results from inclusion of the separation or spacer particulate.

Various high performance, high efficiency, long service interval air filter media that are cost effective and easy to manufacture are provided. The filter media of the present invention can have at least two layers comprising blends of binder and non-binder fibers that are thermally bonded to one another and set to caliper in a high velocity forced draft oven. The layers can also be subsequently resin saturated, dried, and optionally cured. The resulting media can be characterized as having a gradient in properties such as fiber composition, fiber diameter, solidity, basis weight, and saturant content.

A wind turbine comprising a wind turbine blade with high lift and / or low solidity is provided. The blade is directed towards pitch regulated wind turbines, which are operated at variable rotor speed and have blades longer than about 30 meters. The blade is for example advantageous in that it may provide reduced extreme and fatigue loads at the same or near the same power production.

An advantageous new design of a wind turbine blade and rotor is obtained by providing one, two or more parallel rows of sub-boundary layer vortex generators, whereby a blade is obtained, which is resistant to stall and provides for a high maximum lift coefficient CL,max of the blades and a slender blade design, a low socalled radius specific solidity of the rotor. The very high lift coefficient CL can reduce the necessary blade area and loads or / and increase the length of the blade and maintain the original loads with higher production. The row or rows of sub-boundary layer vortex generators are in a preferred embodiment of the invention provided in combination with Gurney Flaps generating a very high lift coefficient CL with a relative gentle stall at very high angle of attack.

An axial flow pump impeller all-operating-condition design method comprises the following steps that 1, parametric modeling of an axial flow pump impeller is performed, namely 2k design parameters including k wing section cascade solidities and wing placement angle values of the axial flow pump impeller are selected; 2, all-operating-condition optimal design is performed: firstly, conventional design parameters of the impeller are dertemined, then numerical calculation is conducted on the design conditions of the axial flow pump impeller and various losses in a pump are comprehensively analyzed to preliminarily design the axial flow pump impeller having better hydraulic performance under the design conditions in a total-loss minimization mode; secondly, guide blades, a water guide cone and water inlet and outlet flowing channels of the impeller are designed; thirdly, the optimal all-operating-condition weighted average effciency of the pump device is regarded as a target, a lift is regarded as a constraint condition, and a seqential quadratic programming method of a gradient optimum algorithm is adopted to constantly change the design parameters of the axial flow pump impeller and perform iterative numerical calculation of the pump device. The axial flow pump impeller all-operating-condition design method adopts CFD numerical calculation, the design accuray is high, and optimization results are reliable.

In the method, image background is obtained through morphology as demean value image containing target and noise can be obtained by deducting image background from original image, N / S ratio of processing result can be raised by applying pretreatment process based on elliptic paraboloid volume, sing frame detection result can be obtained by selecting detecting threshold with constant false alarm ratio standard, false target is further removed by utilizing solidity of target motion trail, target tracking applies most near neighbour coorelation method and target state is refreshed by applying kalman filtering based on uniform straight-line motion model and trail is utilized to predict possible position of target for carrying on stable tracking if target is lost.

Disclosed is a layered time comparative clock synchronized method in the wireless sensor network, which belongs to the wireless network technology field. The method comprises the following steps: step one, the network initialization is started, and the network is layered from a basic station / a coordinator according to the signal intensity and the device category; step two, the whole network is divided into outer clock source synchronization and inner clock source synchronization, the nodes are synchronized by adopting the timestamp comparative method, and the upper-level nodes and the lower-level nodes respectively take the outer clock source synchronization and the inner clock source synchronization; step three, the synchronizing cycle and the clock drift parameter are regulated according to previous synchronization effects; step four, the old timestamp is automatically discarded. Compared with prior art, the method can better correspond with the accuracy of the wireless sensor network time synchronization method, and has the advantages of low cost and solidity.

The invention relates to a device and method for treating the backfilled area of the productive stratum adjacent to the drilling area of oil and gas wells using high pressure pulses. The technological equipment consists of a submersible cylindrical container which is equipped with a high pressure section for accumulating the gaseous working agent, a high pressure one-way electromagnetic valve for dispensing the gaseous agent, a low pressure section where gamma radiation and material solidity detectors and data transmission equipment are located, an intermediate section where at least two one-way nozzles are located, specially arranged radially for injecting the working agent into the areas to be treated, and the technical control and operating equipment.

A low solidity vaned airfoil diffuser for a centrifugal compressor wherein each blade has a lean angle greater than zero and wherein the hub stagger angle may be the same as or may be different from the shroud stagger angle for each blade.

The invention relates to a hydraulic design method of a high-lift axial flow pump impeller. Main geometric parameters of the impeller are provided, and include a maximum thickness delta max of axial flow pump blades, a molded line radius R, an impeller blade number z, an impeller hub side cascade solidity Sh, an impeller rim side cascade solidity S0, a blade inlet placing angle beta 1, a blade outlet placing angle beta 2, a blade inlet axial surface speed vm1, a blade outlet axial surface speed vm2, a blade outlet peripheral component speed vu2, an impeller diameter D, an impeller hub ratio Rd, an impeller lift coefficient psi, an impeller inlet hub diameter d2, an impeller hub dispersion angle alpha, an impeller round nut height hb, a blade outlet placing angle coefficient K beta 2, a blade inlet placing angle coefficient K beta 1, selection of wing sections with different sections of blades and the like. The designed axial flow pump impeller improves both the impeller lift and the cavitation resistance of an axial flow pump, facilitates computer programming, and can replace traditional similar design method and speed coefficient method of the axial flow pump to a greater extent.

The invention discloses an Internet of Things credible data service model based on a block chain. An application layer provides system visual interaction entrances for different terminals; The servicelayer adopts an eggjs framework based on nodejs upwards to provide a service interface for the application layer, and adopts web3js downwards to interact with the intelligent contract layer to realize a service providing function interface; The intelligent contract layer uses a Solidity language to realize the core function of the perception service and related business logic; The block chain layer builds a private chain based on an Etherum platform to realize a distributed block chain network environment, and utilizes a consensus mechanism, an encryption algorithm, a timestamp and other technologies to help to realize data security storage and data traceability; And the storage layer stores metadata in a manner of combining a traditional database and an IPFS distributed file system. A more effective solution is provided for data service management of the Internet of Things, and meanwhile, a convenient data interaction means is provided for related data analysis departments.

A Prioritized-Layered Projection (PLP) method and system for optimizing the rendering high-depth complexity scenes. Objects in each frame are prioritized with an estimation of the visible set within the rendered frame. A priority order for only the primitives in visible sets within the frame are computed "on demand" to maximize the likelihood of rendering visible primitives before rendering occluded ones. For a fixed budget, such as, time or number of triangles, rendering is constrained to a geometry budgeted priority. The method includes two main steps: an occupancy-based tessellation of space; and a solidity-based traversal algorithm. By first computing an occupancy-based tessellation of space, more cells result where there are more geometric primitives. In this spatial tessellation, each cell is assigned a "solidity" value directly proportional to its likelihood of occluding other cells. In its simplest form, a cell's solidity value is directly proportional to the number of primitives contained within the cell. Cells are marked for projection, and the geometric primitives contained within the marked cells are rendered. Cell solidity, and other view-dependent information determines the order cells are rendered.

The invention discloses a method for converting ethereum intelligent contracts into hyperledger intelligent contracts. The method comprises the following steps of: carrying out training by using a machine learning method so as to obtain a conversion model; inputting a Solidity source code and preprocessing an intelligent contract code, compiled by using Solidity, on an ethereum; and carrying out high-class recognition work such as object recognition, algorithm recognition, module recognition and interface recognition by using a trained mathematic model, and converting an intelligent contract of a Solidity language into an intelligent contract of a Java language on a hyperledger. The method is capable of realizing rapid conversion from ethereum intelligent contracts to hyperledger intelligent contracts, so that the development time and development cost of the developers are saved.

The present invention relates to a capacitive pressure sensor for vacuum pressure measurement based on glass and alloy materials, which has strong firmness and corrosion resistance. Sensitivity, high-precision measurement of the pressure value of different pressure sections, using "elastic diaphragms" made of corrosion-resistant elastic alloys with different thicknesses (10-200 microns), these diaphragms are tightly, Symmetrically and stress-free configured in a composite piece made of glass and alloy materials.

The invention is a method of the audio frequency watermark handling which is based on DWT, resisting DA / AD transposition; it belongs to the safety field of multi-media information. The invention has two processes, one is watermark insertion, the other is watermark monitor; the watermark is inserted in the low frequency sub-strip of minor wave modulus to resist the attack against overlaying noise; three section of minor wave modulus are a group to insert a bit watermark information to remove the effect of energy change, the multiunit insert many bits of watermark; designing the re-synchronization technology based on the synchronization code and interpolation operation to remove the effect of the stretch of time axis. The invention can not only resist the effect on watermark brought by DA / AD transposition in effect , but also have great solidity against common attack operation (such as MP3 compression , noise etc.). Besides to protect the audio frequency production to transmit in digital route, the invention can protect the audio frequency data crossed the DA / AD equipment, and be used to monitor advertisement of the music broadcasting station.

A fan enabling increased air volume includes at least a fan wheel and a driving unit for driving the fan wheel to maintain a uniform rotating speed. The fan wheel includes a hub and a plurality of blades radially extended from an outer periphery of the hub. The blades may be arranged on the hub in different manners, such as having a preceding blade overlapped a following blade, or having a blade root installation angle smaller than 53° and a blade tip inclination angle smaller than 46°, or having a solidity of blade roots larger than 1.5 and a solidity of blade tips larger than 1, so that the fan wheel produces increased air volume and accordingly enhanced cooling power at the uniform rotating speed.

The invention discloses a static code auditing system and method for an intelligent contract on an Ethernet workshop platform of a block chain, and belongs to the technical field of information security. According to the method, security threats existing on the smart contract written on the Ethereum platform by using the Solidity language can be detected, the specific position is positioned, the harm is explained, and a corresponding solution is given. The method comprises the steps that firstly, a user inputs a to-be-detected project directory or a path of a single file into a system, the system conducts preprocessing operation on input content, the whole project is copied into a temporary work directory, and annotation content in a Solidity file in the temporary work directory is deleted; Secondly, the system analyzes each Solidity file into a syntax tree form through operations such as lexical analysis and grammatical analysis; Then, the system performs static feature matching on the syntax tree structure and a pre-established logic matching feature to obtain a matching result; And finally, classifying and summarizing the matched results by the system to generate a report file,namely a detection result.

According to an embodiment disclosed herein, an apparatus for cooling a rotating part having cooling channels therein, the rotating part attaching to a disk rotating about an axis, the disk having a conduit for feeding a cooling fluid to the cooling channel is described. The apparatus has a first impeller rotating with the disk and in register with the conduit and an outer periphery of the disk, the impeller directing the cooling flow to the conduit.

A variable pitch fan for a propulsion device is provided. The variable pitch fan includes a plurality of fan blades coupled to a disk and a rotatable front hub covering the disk. Each fan blade is rotatable about a pitch axis to vary a pitch of the fan blade. The pitch is variable within a pitch range that is at least about 80° to about 130°. Each fan blade extends radially outward from the disk along a span from a root to a tip. A portion of the span adjacent the root defines a root span region, a portion of the span adjacent the tip defines a tip span region. A solidity of the variable pitch fan is at least 1.0 in the root span region.

The invention discloses a test case generation method oriented to a Solidity language, which comprises the following steps of: for an intelligent contract program implemented by applying the Soliditylanguage, obtaining a corresponding control flow graph (CFG) according to the program, wherein the control flow graph covers calling information among function methods in the intelligent contract program; obtaining a definition-use pair (dup) of a variable present in the program according to the program CFG; in the process of generating the test case, applying a genetic algorithm to accelerate thegeneration speed of the effective test case. The integer overflow safety problem existing in the Solidity is considered, the definition and use of variables capable of causing integer overflow errorsby the test case are emphasized when the fitness function of the genetic algorithm is designed, so that coverage is realized, and the fitness value of the test case for realizing coverage on the dumprelated to the integer overflow errors is relatively large. The method provided by the invention is feasible, and realizes integer overflow coverage test on the basis of realizing coverage test on conventional variable operation in a program.

The invention discloses a traceability system and method based on combination of a block chain and the Internet of Things. The system comprises a data acquisition module; an encryption module; a datatransmission module and an SAAS module, and the method comprises the steps that a production base produces the raw materials, and the initial states, growth stages, harvesting stages and processing stages of the raw materials and the traceability data, photos and videos of the finished products are collected through the data collection module; the solidity control is adopted, after the encryptionmodule is used for encryption, the HASH values of the photos and videos and the storage addresses of the photos and the videos on an SAAS module are submitted to the block chain, and the traceabilitydata is signed through a private key and is submitted to the block chain after being attached to a GAS; and a user inputs a keyword search in the DAPP module to obtain the commodity traceability, photos and videos. According to the invention, the Internet of Things technology and the block chain technology are combined, and each node on the Internet of Things is upgraded to be a block chain node.

The invention relates to a special turbine for a self-variable-pitch bidirectional-flow ocean current power station, belonging to the field of renewable energies. Symmetric airfoil (NACA0012) high-solidity blades are adopted. The root part of each blade is provided with a self-variable-pitch hydrodynamic force compensation winglet. A limiting control system is arranged at the root part of each blade to ensure that the angle of the blade can be adjusted. When the direction of ocean current is changed, the hydrodynamic force compensation winglet of the blade generates deflection torque to enable the blade to vary blade pitch and the angle is limited by a limiting controller arranged at the root of the blade. Thereby, the optimum attach angle is kept, the highest conversion efficiency is obtained, the rotating direction of the blade is unchanged when reverse current comes, the entire generating set has no direction adjustment control device and power transmission cables are prevented from being twisted. The used material can effectively resist seawater corrosion. The invention has the advantages that the structure is simple, the operation is reliable, the special turbine has the property of resisting seawater surge destruction, and the turbine can continuously and stably work in seawater for long time.

A method and system for segmenting text from non-text portions of a digital image using the size, solidity, and run length characteristics of connected components within the image data. For a connected component comprising a rectangular group of pixels enclosing a set of connected pixels having the same binary state, the size characteristic may be based on a ratio of height to width of the connected component and the total number of pixels within the connected component, the solidity characteristic may be based on a ratio of pixels within a convex hull of the set of connected pixel to a total number of pixels within the connected component, and the run length characteristic may be based on a number of transitions within the connected component.

The invention discloses an auxiliary hole digging device for detecting roadbed solidity based on a sand filling method. The device comprises a base plate, a bracket, a first transmission assembly, a second transmission assembly and a third transmission assembly; a round hole is formed in the base plate, and a baffle plate is arranged on the edge of the base plate; the bracket comprises a pluralityof supporting rods, a first supporting plate and a second supporting plate; the supporting rods are successively and fixedly connected with the first supporting plate and the second supporting platefrom top to bottom and uniformly distributed in the circumferential direction of the second supporting plate; grooves are formed in the lower ends of the supporting rods, and the grooves are used forcooperating with the edge or top angle of the base plate; a stepped hole is formed in the second supporting rod, and the diameter of the stepped hole is reduced from top to bottom; a blind hole is further formed in the second supporting plate, the center line of the blind hole is parallel to that of the stepped hole, and the blind hole is communicated with the stepped hole; the device can conveniently correct the side wall and bottom of a detecting hole.

According to an embodiment disclosed herein, an apparatus for cooling a rotating part having cooling channels therein, the rotating part attaching to a disk rotating about an axis, the disk having a conduit for feeding a cooling fluid to the cooling channel is described. The apparatus has a first impeller rotating with the disk and in register with the conduit and an outer periphery of the disk, the impeller directing the cooling flow to the conduit.

The invention relates to a measurement method of a seepage flow movement rule and belongs to the field of research on basic theory of natural science and vadose zone hydrology. The method comprises the following steps: carrying out field measurement of seepage-in flow and seepage-out flow of stressed section, downstream water level height of the section, upstream water level height of the section, downstream water level distribution area of the section, seepage-out and seepage-in section areas, virtual degree or solidity of the section; then building a relation equation among the quantities according to an opposite and uniform action rule equation set; and finally solving unknown quantities via an equation solving method so as to achieve the purpose of solving practical problems or prediction problems. The measurement method of the seepage flow movement rule has the beneficial effects of showing the theory, the formula and the method for researching, calculating and measuring the seepage flow rule, which conform with the objective laws, enabling the scientific research, experiment and actual measurement of the seepage flow to really embark on a scientific, systematic, theoretical, practical and programmed way, ensuring that the measurement work of the seepage flow rule is not detoured again, and saving manpower, material resources and financial resources.