76 results about "Attenuation law" patented technology

The invention provides a hydrodynamic pressure scouring test method and a device of bituminous mixture. The method comprises the following steps of: disposing a bituminous mixture test piece in a closed container and soaking in water; heating the water to a temperature to be simulated, keeping the temperature, and filling compressed air in the closed container to 0.68 to 0.7 MPa, i.e. applying positive pressure to the water and the test piece; releasing the pressure of the closed container to normal pressure, pumping the closed container to -0.095 to -0.1 MPa, i.e. applying negative pressure to the water and the test piece; and repeating steps to achieve simulation process of hydrodynamic pressure scouring of the bituminous mixture. The steps are respectively used for testing the determination index of water damage resistance of the bituminous mixture test piece. The invention can acquire the attenuation law of water damage resistance performance of the bituminous mixture and the migration law of bituminous in the mixture by applying hydrodynamic pressure to the bituminous mixture test pipe, simulating the actual condition of bituminous pavement and detecting the water stability of the bituminous mixture.

The invention relates to a technology for testing rock mass mechanics parameters, in particular to a method for testing rock mass mechanics parameters based on an explosion seismic wave space-time attenuation law. The method comprises the steps of data testing and test data processing; and geometric parameters and mechanics parameters of rock mass can be obtained by corresponding testing and calculating. The parameters mainly comprise the viscosity coefficient of the rock mass, the equivalent elastic modulus of the rock mass, an azimuth angle of a structural plane, the rigidity of the structural plane, the thickness of the structural plane, and the elastic modulus of the structure plane; and the relevant parameters of the rock mass are given for analysis of slope stability.

The invention discloses an indoor positioning method based on WLAN, and belongs to the field of indoor wireless communication and network technologies. The method includes the steps that RSSI data, collected by sampling points, of all APs are preprocessed, and one-dimensional vectors and two-dimensional vectors are extracted from the RSSI data and respectively serve as feature vectors; clustering analysis is carried out on the feature vectors, and an area to be positioned is divided into multiple positioning subareas; classification models corresponding to groups of the feature vectors are respectively trained in terms of the feature vectors in each group; the subarea set with the largest number of votes is selected from all the subareas on the basis of the classification models and in combination with a voting mechanism; the method of two rounds of positioning is adopted to narrow the set range of the subareas, and positioning accuracy is improved. According to the method, spatial distribution characteristics of RSSI are fully mined and utilized, and the problems of wide-range indoor positioning, too large searching and matching space and high computational complexity are solved; a novel positioning model is established, and the problems that in an existing WLAN indoor positioning method, the nonlinear and non-Gaussian statistical properties of RSSI signals, caused by non-line-of-sight transmission effect, RSSI attenuation law abnormity and the like, cannot be learned and adapted to are solved.

The present invention can implement the utilization of electromagnetic depth-measuring exploration method in frequency-domain method and time-domain method. Said invention utilizes that exciting and receiving a series of frequency (period) pulses to research the law of whole spectrum, at the same time, research the signal attenuation law of every frequency (period), from short period to long period, the reflected underground informations can be progressively deepened, the superposition of these informations can raise exploration accuracy, and the time-domain and frequency-domain boty can be used for making mutual check by means of time-frequency conversion so as to greatly raise exploration accuracy. Said invention can be mainly used for making exploration of oil, gas, mineral resources and geothermal resource.

The invention discloses a method for judging a main low-frequency vibration noise source of a pumped storage power station ground. Considering basic characteristics of noise of a pumped storage power station and on the basis of analyzing a possible noise source, the background values and the noise values of the sound level A before and after unit operation and the background value and the noise value of an octave band sound pressure level are measured in an underground power house, emphasis is given to the analysis of the spectral characteristics, the background values and the noise values before and after unit operation are measured inside and outside a typical peak resident house and the field ground in a splattering mode, after the spectral characteristics of the background values and the noise values are fully compared, the noise 1/3 octave vibration acceleration level is measured, the attenuation law of noise vibration spreading and the correlation degree of possible noise sources are analyzed, and the judgment about whether the possible noise sources are main noise sources is made finally. The method solves the problem that in a traditional method, the large noise source deeply buried in an underground cave is hard to actually observe.

The invention discloses a super-resolution fluorescent lifetime imaging method based on stimulated emission lost. The super-resolution fluorescent lifetime imaging method based on the stimulated emission lost includes the flowing steps: (1) projecting a first laser beam on a to-be-tested sample and activating grains in the to-be-tested sample to an excited sate; (2) utilizing stimulated emission depletion (STED) light to consume the number of the grains which are in the excited state in step (1); (3) utilizing a second laser beam to stimulate the rest grains to emit fluorescent light and collecting the fluorescent light to obtain corresponding fluorescence intensity images; (4) arranging delay between the second laser beam and the STED light, changing delay time, repeating step (3), and obtaining the fluorescence intensity images under different delay time; (5) conducting treatment on the fluorescence intensity images in different delay time through a computer, and fitting a spot intensity attenuation law, inverting lifetime images, and completing scanning of one point of the to-be-tested sample; (6) and completing two-dimension scanning on the sample to be tested by changing the positions where the beam is projected on the to-be-tested sample. The invention further discloses a device used for implementing the method.

The invention provides a real-time while-drilling gamma forward modeling geo-steering drilling method which includes the steps of in the geo-steering drilling process, based on a pilot stratum model, carrying out real-time forward modeling on while-drilling gamma logging response according to an actually-drilled well track, and carrying out comparative analysis on actually-measured while-drilling gamma logging data to provide the basis for updating the stratum model and adjusting the well track. A while-drilling gamma logging real-time forward modeling computing method based on the stratum model is provided and includes the steps of decomposing the stratum model according to a contact relation between a gamma logging detecting range and a stratum interface, and based on the attenuation law of gamma rays in a stratum, respectively analyzing and computing gamma ray fluxes of areas after the model is decomposed at the positions of detectors. When the real-time while-drilling gamma forward modeling geo-steering drilling method is used for real-time geo-steering, rapid real-time forward modeling can be carried out on a while-drilling gamma logging curve, and therefore the basis is provided for updating the stratum model and adjusting the well track.

The invention discloses a multiple NaI (T1) detectors based radioactive substance two-dimensional locating method in an access control detection system. A two-dimensional locating model of a radioactive substance is determined through the measurement of the attenuation law of gamma rays and the change of the azimuth angle of the radioactive substance at different positions relative to a detector. The energy resolution capability of the NaI detector is utilized to recognize the radioactive nuclide, and the problems of mutual interference of different radioactive nuclides and simultaneous location of different radioactive substances can be effectively solved under a multi-source condition. According to the method, a maximum characteristic peak counting detector with high counting capability, a detector at the opposite side and a second largest characteristic peak counting detector at the opposite side are adopted, situations that the location error is increased and even a position close to the edge cannot be located due to the influence of statistical fluctuation on the counting value of the detector when the solid angle of the radioactive substance on the detection surface of the detector is too small or the attenuation distance is overlong are avoided, and the method has the advantages of short measurement time, high location accuracy and the like.

The invention relates to an exponential fit-adaptive Kalman-based ground-air electromagnetic data de-noising method. According to the technical scheme of the invention, for single-point electromagnetic data during the ground-air measurement, time windows are determined and then the data are segmented at equal logarithm interval based on the features of electromagnetic data in the ground-air time domain according to the approximate e-index attenuation law, and the time constant value of data in each time frame are extracted as fitting parameters. Meanwhile, the data in each time frame are processed based on the e-exponential fitting method, and fitting output results are adopted as predicted values to be input into a filter. After that, the adaptive scalar Kalman filtering method is applied to filtering the electromagnetic noise in data, and the filtered data are subjected to resistivity-depth imaging. Compared with the existing electromagnetic data filtering method in the ground-air time domain, the above filtering method of the present invention not only effectively suppresses the electromagnetic noise in electromagnetic data in the ground-air time domain, but also fully retains and enhances the effective information in measured data. Therefore, both the signal-to-noise ratio and the quality of electromagnetic data in the ground-air time domain are improved.

The invention discloses a method for detecting cement dosage in a core test sample of a cement mixing pile, which comprises the following steps: directly mixing a field in-situ soil sample with water content without major changes into cement slurry with the same water-cement ratio during field construction, and preparing the test sample into the standard cylindrical test sample with unconfined compressive strength; placing the test sample in same-level in-situ plain soil for extrusion, sealing and maintenance after molding; carrying out EDTA titration after achieving the preset age, obtaining an attenuation law curve of consumption of disodium EDTA along with the age, and establishing standard curves in all the ages according to the attenuation law curve; and determining the consumption of EDTA in the sample, checking the cement dosage from the standard curve, and finally obtaining the cement dosage in the core test sample of the cement mixing pile. The method has simple operation, accurate detection result, good stability and good repeatability.

The invention discloses a slope model experimental method and system for researching an exploitation and blasting dynamic instability mechanism from an open pit to underground. The method comprises the following steps of manufacturing of an experimental model; loading of the experimental model, wherein an initial stress condition and different blasting vibration simulating loads of an experimentaltest block are loaded; model experiment testing. The system comprises a model manufacturing system, a model loading system and a structural plane shearing resistance strength test system, the model manufacturing system comprises an upper-lower side rock surrounding mold, a similar upper-side rock surrounding material, a similar lower-side rock surrounding material and an experimental model frame;the model loading system comprises an experimental test block initial stress state applying device and a blasting vibration simulating load applying device, and the structural plane shearing resistance strength test system comprises a stress control type shearing device, a lifting jack and a dial indicator. The slope model experimental method and system for the researching exploitation and blasting dynamic instability mechanism from the open pit to underground have the advantages that the aim of repeatable operability for simulating blasting vibration wave loading is achieved, and the attenuation law of the shearing resistance strength of the slope rock body structural plane under repeated blasting vibration effects can be objectively and visually reflected.

The present invention discloses a non-synchronous fault location method for a half-wavelength transmission line based on the amplitude attenuation characteristics of the line mode voltage traveling wave. Based on the attenuation law of the amplitude of the high frequency component when the line mode voltage traveling wave propagates on the half-wavelength transmission line, the non-synchronous fault location scheme for the half-wavelength transmission line combining the single-ended traveling wave distance measurement with the traveling wave attenuation characteristics is proposed. The main idea is to firstly estimate the fault location roughly after a fault occurs, and a corresponding fault distance measuring method is selected for location according to the attenuation degree of the amplitude of the line mode voltage traveling wave. The method combines the distance measurement principle based on the attenuation principle of the amplitude of the line mode voltage traveling mode and the single-end distance measurement principle to carry on half-wavelength transmission line fault location, and gives full play to the advantages of the two kinds of distance measurement methods. The method does not need precise synchronization of measuring points and has high engineering practical significance.

The present invention discloses HF compensating method for seismic signal with seismic microlog. The seismic waveform information is utilized in analyzing spectral characteristic of primary waveform in direct wave and finding out the attenuation features of seismic signal in different depths. Meanwhile, system input and output are used in analyzing absorbing attenuation response of near surface system and performing HF compensation of seismic data. The present invention applies seismic microlog technology in the research of attenuation law of near surface medium, and the waveform characteristic of serial seismic primary waves is used in searching the waveform spectrum variation in different depths, so that one reverse filter factor is found out for the HF compensation of superposed seismic data with artificial seism reflecting signal. The present invention has raised seismic signal distinguishing capacity.

The invention discloses an explosive loading low-temperature impact initiation experimental device and method. The device comprises a chemical explosive impact loading system, a partition, a to-be-tested sample, a base and a low-temperature control system, wherein the low-temperature control system comprises a cooling device, a temperature sensor and a low-temperature controller; the partition comprises an upper thermal insulating layer and a lower attenuation layer. The method comprises the following steps: determining a booster explosive, selecting the thermal insulating layer and the attenuation layer according to the attenuation law of impact waves in materials, determining the thicknesses of both layers, properly assembling the experimental device, setting target temperature and cooling rate, priming a detonator when the temperature reaches the target temperature and becomes stable, and recording various performance parameters of the sample during the explosion process. The chemical explosive loading low-temperature impact initiation experimental device provided by the invention can directly cool the to-be-tested sample, and is high in speed and efficiency and uniform in cooling; moreover, the sensor is placed inside the to-be-tested sample, so that timely temperature feedback is achieved and the precision is high; besides, the partition is formed by the thermal insulating layer and the attenuation layer, so that the impact loading control cannot be affected by low temperature.

The invention provides a three-dimensional audio signal generation method and system for a non-spherical speaker array. The method comprises the steps of creatively, for most environments such as a home or theater, that is a non-spherical environment, arranging a speaker array, inputting location information of a speaker arranged in the available environment, location information of a virtual sound source in need of simulation and a sound source signal, and converting the locations into coordinates relative to an origin; conducting analysis and selection based on the converted speaker coordinate and the virtual sound source coordinate, selecting one to three speaks, mapping the speakers to a spherical face with a coordinate origin as the centre of sphere and the minimum distance from the selected speakers to the coordinate origin as the radius to form a virtual speaker, calculating the gain of the virtual speaker, and then based on the attenuation law of sound transmission, deriving an original actual speaker from the gain of the virtual speaker so as to achieve the purpose of virtual sound source reconstruction by using a sound signal after gain.

The invention discloses a high-speed railway sound barrier insertion loss prediction method of a five-sound-source mode. The method comprises the following steps of equivalently simplifying a high-speed railway noise source into a wheel-rail area noise source, a train body lower part noise source, a train body upper part noise source, a current collection system noise source and a bridge structure noise source according to the composition, position, frequency characteristics and attenuation law of the high speed railway noise source, and respectively calculating the insertion loss of a wing plate for the five sound sources by virtue of a single-sound-source mode; spreading the noise of a wheel-rail area, a train body lower part, a train body upper part, a current collection system and a bridge structure to be superimposed with noise on a sensitive point after a sound barrier is installed, obtaining a main noise grade after the sound barrier is installed, subtracting the main noise grade from the noise grade before the sound barrier is installed, introducing an insertion loss correction item of the bridge wing plate, and obtaining an insertion loss prediction value by adopting the five-sound-source calculation method. By adopting the method, the weaknesses in the traditional sound barrier insertion loss prediction method can be overcome. The high-speed railway sound barrier insertion loss prediction method is applied to the high-speed railway sound barrier engineering design and the ambient noise influence valuation and has the advantages of accurate prediction value and high engineering practicability.

The present invention discloses a bridge structure monitoring and evaluation method based on the stiffness attenuation law of the main beam. The method comprises: in a monitoring period, using a deflection sensor to collect mid-span deflection-varying parameters at a designated position of a monitored bridge, and obtaining the truck weight by using a vehicle dynamic weighing system; in the bridgemonitoring data, selecting the parameter of the mid-span deflection exceeding the set threshold and the truck weight exceeding a certain threshold; through the time correlation between the deflectionsensor and the vehicle dynamic weighing system, obtaining a sequence value of the sampling deflection changing with the time and the overloaded vehicle weight sequence value; and through linear fitting by using the least squares method, obtaining the attenuation rate coefficient of the bridge structure stiffness so as to realize the prediction of the bridge life. The method provided by the presentinvention is scientific and reasonable, simple and feasible, and convenient to be implemented, and is of great significance for the bridge evaluation.

The invention provides a median filtering method and system based on vertical earthquake attenuation laws. The method comprises the following steps: collecting VSP (Vertical Seismic Profiling) data; selecting single component data according to the VSP data; carrying out zero-phasing treatment on the single component data, so as to obtain a profile treated through zero-phasing treatment; obtaining a time curve according to the profile treated through zero-phasing treatment; determining spherical spreading compensation TAR factors according to the profile treated through zero-phasing treatment and the time curve; pulling the profile treated through zero-phasing treatment to be homogeneous along the time curve, and obtaining a homogeneously pulled profile; carrying out directional weight median filtering on the homogeneously pulled profile according to the TAR factors of the VSP data. The median filtering method and system, provided by the invention, solve the problem of no reliable wave field separation method in VSP data processing used for well control.

The invention discloses an asphalt mixture simulation fatigue test method under a control strain loading mode; the test method comprises the steps: obtaining asphalt mortar fatigue failure conditionsby carrying out a fatigue test of asphalt mortar, carrying out fatigue test to output a fatigue characterization variable by generating an asphalt mixture simulation test specimen, and comparing the output characterization variable with the fatigue failure conditions, so as to obtain asphalt mixture fatigue failure related parameters. The method can well simulate the stress state of the asphalt mixture during the four-point bending fatigue test; based on the obtained asphalt mortar fatigue performance attenuation law, the method can arbitrarily change the content of coarse aggregates to achieve simulation of the asphalt mixture fatigue process without actual asphalt mixture fatigue tests, solves the problems that an asphalt mixture fatigue test cycle is long, the discreteness of experimental results is large and the test cost is high, and is of great significance for professional research on road engineering.

The embodiment of the invention provides an early alarming method and a vehicle. The early warning method is applied to vehicles with vehicle control equipment and comprises, when a movable obstacle in front of a moving vehicle is detected, acquiring the distance between the vehicle and the movable obstacle; according to the distance and the attenuation law of sound to distance, determining the early alarming volume; generating early alarming signals according to the early alarming volume; outputting the early alarming signals. The early alarming method can precisely control the volume.

The invention provides a synthetic aperture radar (SAR) image radiation measurement error correction method, so as to correct influences on the gray scale of the synthetic aperture radar image by weighting of a synthetic aperture radar antenna pattern and attenuation of a propagation distance. The method comprises steps: according to synthetic aperture radar system parameters and geometric parameters, the antenna propagation direction and the propagation slant distance corresponding to each pixel in the synthetic aperture radar image are calculated; according to the synthetic aperture radar antenna pattern data and a propagation distance attenuation law for synthetic aperture radar signals, a pattern weighting correction function and a propagation distance weighting correction function for each pixel in the synthetic aperture radar image are calculated; and according to the pattern weighting correction function and the propagation distance weighting correction function, compensation processing is carried out on the gray scale of each pixel in the synthetic aperture radar image. Thus, when the method of the invention is adopted, influences on the gray scale of the SAR image by factors such as the weighting of the SAR antenna pattern and the attenuation of the propagation distance can be corrected, and the radiation measurement errors of the SAR image can be corrected.

The invention discloses a simulated modeling method for single-gap partial discharging of an insulating medium. The method comprises: (1), according to a partial discharging experiment characteristic and a physical process, an insulating medium model is selected; (2), on the basis of an attenuation law of a discharging charge in an air gap, discharging delay time in different polarity situations is calculated and discharging starting and stopping conditions are determined based on the time; (3), an inductive charge additional capacitor is introduced; (4), influences on a discharging characteristic by an air gap temperature and the intensity of pressure are introduced; and (5), according to the steps (1), (2), (3), and (4), a novel simulated model for single-gap partial discharging of an insulating medium is established and a simulation analysis is carried out on the model, wherein the inductive charge additional capacitor is included by the model. According to the invention, on the basis of the partial discharging generation mechanism of the insulating medium, the discharging characteristic, and the development rule, the simulation result and the experiment result match each other perfectly, so that the effectiveness of the simulated model is improved and the detection and diagnosis on partial discharging can be realized well.

The invention discloses an upstairs object throwing alarm system and method for ensuring public safety. The upstairs object throwing alarm system comprises an ultrasonic transmitter, an ultrasonic receiver, a plurality of reflectors, a processor, electronic eyes and alarms, wherein the ultrasonic transmitter is arranged at one corner of a building, while the ultrasonic receiver is arranged at another corner of the building; the reflectors are distributed on the walls of two buildings; a wave beam sent by the ultrasonic transmitter is reflected by the reflectors, and finally enters the ultrasonic receiver, so that a sound wave transmission network is formed. A sound wave gradually declines in air, each reflection can cause energy loss, and beam blocking is caused by a thrown object and impacts the original energy attenuation law of a beam network, so that the specific location of the thrown object can be calculated; the electronic eyes are mounted at the tops of the buildings and are used for photographing the thrown object; the alarms are mounted in property offices or at the management sections of the buildings, so that a manager is prompted to punish or arrest an offender.

The invention discloses a simulation test device for a borehole wall bearing characteristic under a hydro-mechanical coupling function, comprising a simulation rock, a loading system, a seepage fieldcontrol system, a data acquisition system and a master controller; wherein the master controller is connected with the loading system, the seepage field control system and the data acquisition system.Through adoption of the simulation test device of the invention, a horizontal loading force, a vertical loading force, a concrete borehole wall axial loading force and a seepage water pressure are applied to the simulation rock, then space-time evolution laws of various physical fields are monitored by a monitoring component in a test process, and a series of on-site and laboratory parameters such as physical and mechanical properties and formation stress conditions of the concrete borehole wall, a curtain grouting body, a roof water-resisting layer, an aquifer and a bottom water-resisting layer are obtained, and similar simulation test research of ultimate bearing capacity and rheological fracture of the concrete borehole wall under the hydro-mechanical coupling function is performed, soas to obtain a time-based attenuation law of the ultimate bearing capacity of the concrete borehole wall under the hydro-mechanical coupling function.

The invention discloses a method for identifying a traveling wave in an initial reversed polarity direction. The method can be used for effectively identifying the wave head of the traveling wave in the initial reversed polarity direction under various conditions and is not influenced by factors such as the fault type, modulus transmission, modulus attenuation and the like. The method comprises the following steps of: 1, starting to carry out wave recording by traveling wave distance measuring equipment; 2, detecting a fault initial traveling wave, recording time t1 that the fault initial traveling wave reaches a home terminal of a measuring terminal and extracting a traveling signal in an interval of [0.2tMF+2tNF] after the fault initial traveling wave, wherein tMF and tNF respectively represent required time that the fault traveling wave is transmitted to the home terminal of the measuring terminal from a fault point and required time that the fault traveling wave is transmitted to an opposite terminal of the measuring terminal from the fault point; 3, actually measuring the values of Delta t1 and Delta t2 and discriminating the property of the traveling wave in the initial reversed polarity by a criterion on the basis of a formula that Delta t1/Delta t2=f(LMF); 4, if a special point is generated, identifying the special point by a criterion on the basis of function features between the Delta t1 and a fault distance; and 5, if an extreme case is generated in the step (4), combining an actual wave-recording line and zero mode component attenuation law to carry out further judgment.

A method of and apparatus for obtaining radiation transmission data from a liquid in such manner that allows some data about relative proportions of constituent ingredients to be derived is described. A radiation source and a radiation detector system able to resolve transmitted intensity across a plurality of frequencies within the spectrum of the source are used to produce transmitted intensity data for each such frequency. Measured data is compared numerically to a mass attenuation data library storing mass attenuation data, individually or collectively, for a small number of expected constituent ingredients of the liquid to fit each intensity data item to the relationship given by the exponential attenuation law: I/I_O=exp [−(μ/ρ) ρt] in respect of the constituent ingredients and derive therefrom an indication of relative proportions of each constituent ingredient.