35results about How to "Lower detection threshold" patented technology

A method and a device are proposed for the exchange and the processing in common of object data between sensors and a processing unit, position data and / or speed data and / or additional object attributes (size, identification, markings) of sensor objects and fusion objects being transmitted and processed.

The invention relates to an underwater motion array multi-target detection and position estimation integrated method which is characterized by according to a motion array signal model, obtaining a twice-continuous-measurement reception data formula and obtaining phase correction factors; carrying out matrix-form block partitioning on the motion array signal model; by utilizing the synthetic aperture technique and utilizing the phase correction factors, extending a physical array into a virtual array and reconstituting the block matrixes into data matrixes to form MVDR spatial spectrum, and obtaining a detection threshold value through on-site noise study; and obtaining spectrum peak number above the detection threshold value which is regarded as the target number, and the angle corresponding to the spectrum peak is the azimuth angle of an incidence target. The method fully utilizes the underwater motion array synthetic aperture technique to improve array gain and angular resolution, and utilizes an MVDR spatial spectrum function for reflecting signal energy to determine the number of the targets and method; and compared with coherent signals, the detection performance of the method under low signal to noise ratio is obviously superior to that of the conventional method, detection threshold is reduced, farther detection distance is achieved, and position estimation value can be given.

An imaging device having an imaging element which takes a subject image by light from a subject passing through a photographing lens and obtains an image data, includes a filter selection device configured to select a filter transmitting an optional frequency component of the subject image; an autofocus detection device configured to detect a focus from an image data obtained by moving a focus lens to a lens position; and an acquisition timing setting device configured to set a timing of capturing the image data, the imaging device being configured to use the acquisition timing setting device in accordance with a photographing condition, and change the filter of the filter selection device in accordance with the acquisition timing set by the acquisition timing setting device.

A grid interconnection device includes a relay controller configured to control separation or interconnection of a relay; a receiver configured to receive, from a predetermined transmission path, power failure information containing at least local area information indicating an area in which a power failure occurs; a determination unit configured to determine an occurrence of a power failure in a power distribution system, when the power failure information includes local area information of an area to which the power distribution system belongs; and a detector configured to detect an islanding state. The detector increases detection sensitivity of the islanding state when the determination unit determines the power failure in the power distribution system. The relay controller performs separation control for the relay when the islanding state is detected by the detector.

A radiation detector of the present invention has at least one radiation measuring component and a radiation detector surface. A layer of protective covering substantially covers the radiation detector surface and protects the at least one radiation measuring component. The layer of protective covering preferably includes a protective material sub-layer and may include an optional coating sub-layer. The radiation detector surface may be, for example, a scintillator, cover glass, or chip surface.

A drive device for a load (18a) comprises a device for detecting accidental collisions with a motor (14a), a first, respectively a second position sensor (15a, 16a) disposed upstream, respectively downstream of a transmission assembly (12a) providing first and second values of position. A calculation unit (20) makes it possible to calculate an error signal (d) corresponding to the difference of these position values. Ways to discriminate are devised so as to analyze the successive error signals as a function of the path (xR) traversed by the load in a spatial reference frame (xR, d). Filters with rectangular spatial window or with exponential spatial window are particularly adapted for discriminating between errors due to an accidental collision and those due to other causes attributable to normal operation. One thus obtains particularly reliable and sensitive collision detection with a very low detection threshold.

The invention provides a drug detection device and detection method. The device comprises a shell, a collection module, a drug detection card and a drug detection module, wherein the collection module and the drug detection card are arranged on the outer part of the shell; the drug detection module is arranged in the shell; the collection module, the drug detection card and the drug detection module are connected in sequence; the drug detection module comprises a developing interpretation submodule and an intelligent control submodule, wherein the developing interpretation submodule is used for reading an optical signal detected on the drug detection card; the intelligent control submodule is connected with the developing interpretation submodule for processing the optical signal detected by the developing interpretation submodule to obtain a detection result. According to the device, the developing interpretation submodule is used for replacing human eye identification, a color distinguishing degree for a drug detection card developing result is improved, drug taking detection sensitivity is enhanced, a drug detection threshold value is lowered, and the case handling efficiency of law enforcement officers is improved.

The invention discloses a kit capable of quickly diagnosing the H1N1 influenza virus. The kit comprises seven nucleotide sequences and a RCA reaction system. When the kit is combined with the H1N1 influenza virus in an aptamer-ligand enrichment sample, rings are specifically formed, two-primer RCA reaction amplification is achieved, the hydroxynaphthol blue of an RCA product visually is developed,and it can be achieved that the H1N1 influenza virus is quickly detected on site.

A beta radiation monitor (70,90), comprising a gas flow proportional detector (60) for detecting beta radiation emitted by a beta emitter external to the detector; a fill gas supply (51) configured to supply a fill gas to the detector, wherein the fill gas comprises nitrogen; a temperature sensor (72) for measuring temperature; and a controller (64) in communication with the temperature sensor for adjusting an operational parameter of the monitor in accordance with the measured temperature. The operational parameter may comprise a voltage applied across the fill gas, which may be thermistor controlled, or a beta radiation detection threshold of the detector. The fill gas is supplied by a nitrogen generator. The gas flow proportional detector may be a large-area detector.

Amplifying device for a sensor (10) delivering a response in voltage or impedance comprising: voltage controlling means (22 connected to output terminals (16, 20) of the sensor to maintain a noticeably constant voltage between the said terminals, at least an additional impedance (12) connected in series with the sensor within a polarisation circuit, between the output terminals (18-16; 18-20) of the said device. Application to temperatures, irradiation levels and pH measurement.

Processing of a range-Doppler matrix of a radar system is described. For easy, efficient and rapid ascertainment of a detection threshold of the range-Doppler matrix, only a partial quantity of the cells of the range-Doppler matrix is selected, and the detection threshold is ascertained on the basis of the selected partial quantity of cells of the range-Doppler matrix.

The invention discloses a method for rapidly detecting a contrast sensitivity threshold value, and belongs to the technical field of contrast sensitivity threshold value detection. The method comprises the following steps: S1, selecting a measurement function and a maximum iteration number, and initializing a lookup table of a current iteration number, a prior probability density and a conditional probability; s2, calculating the probability after feedback is obtained next time; s3, predicting the probability of each measurement function; s4, predicting the entropy of the probability density function of the measurement function in the whole parameter space; s5, predicting the expected entropy of each stimulus; s6, finding out the stimulation intensity when the expected entropy is minimum; s7, designing a disturbance operator and then adding the disturbance operator to the stimulation intensity of S6; s8, adding a disturbance operator, and calculating to obtain posterior distribution; s9, calculating new parameter prediction; and S10, if the current iteration number is equal to the input maximum iteration number, outputting a threshold value, otherwise, skipping to the step S2. According to the invention, stimulation can be adaptively optimized and adjusted, the speed of threshold estimation is accelerated, the accuracy is ensured, and the requirement of equipment is reduced.

The invention relates to a plum blossom contact finger clamping force detection method and a device thereof, and the method comprises the steps: collecting a picture of a plum blossom contact finger, and determining the model of the plum blossom contact finger according to the picture; downloading corresponding detection data from a remote server according to the model of the plum blossom contact finger; demonstrating a demonstration animation in the detection data through an interactive interface, and dynamically adjusting the progress of the demonstration animation according to a clamping force acquisition signal; caculating the clamping force of the plum blossom contact finger according to the collected signals, and displaying the detection result of the clamping force of the plum blossom contact finger through an interactive interface and storing in a remote server. The beneficial effects of the product are that the detection threshold is reduced, and the detection precision is improved.

The invention belongs to the technical field of environmental pollution detection and discloses a method of detecting cadmium in a water sample based on an orthophenanthroline-carmine fluorescence method. The method comprises the following steps: adding 0.50mL of citric acid-disodium hydrogen phosphate buffer solution with the pH of 4.5 and 1.00ml of 0.30*10<-4>mol / L orthophenanthroline as well as a 0.60ml of 0.12*10<-4>mol / L carmine solution; performing a reaction for 15min, stabilizing the reaction for 6 h or more than 6h, and measuring the fluorescence intensity value 30min after the reaction; and by taking deltaF as a vertical coordinate and cadmium concentration as a transverse coordinate, drawing a standard curve to solve the concentration of the water sample. The instrument is low in price; the detection threshold is low; the sample detection cost is low; and the operating steps are simple and the reaction is quick.

The invention relates to telecommunication systems and in particular to a method and system for efficient connection setup procedure for mobile terminated calls. A method of connection setup for mobile terminated calls is proposed in which a page message originating from the access network contains one access sequence along with access terminal identity or unicast access terminal identifier (UATI) of the paged access terminal. When more than one access terminal uses the same access sequence for sending their access probe at the same time a collision may occur. Access network selects access sequences from a reserved pool to direct the paged access terminal for performing access attempt to avoid collisions during access attempts. With this resource pooling, there is no need to send bind request and hence connection setup time reduces.

The invention discloses a method for evaluating a face state, and belongs to the technical field of skin detection. The method comprises the following steps: acquiring a face image of a user face by adopting an image acquisition device, using the face image as a to-be-detected image and uploading the to-be-detected image in a cloud server remotely connected with the image acquisition device; performing identification by the cloud server to acquire all face skin characteristic points in the to-be-detected image and positioning each first detection area according to the face skin characteristicpoints; respectively evaluating the skin states of the all first detection areas by adopting corresponding first evaluation units through the cloud server and respectively putting evaluated results; and issuing the evaluated results to a user terminal remotely connected with the cloud server by the cloud server and providing users for checking. The method disclosed by the technical scheme of the invention has the beneficial effects that comprehensive and accurate face state evaluated results are provided for users, and the users are helped to manage the face states at any time; and moreover, realization is simple.

The invention relates to the technical field of virus detection, and discloses a crRNA primer pair for PPV detection, a CRISPRCas12a system and an application method.The method comprises the following steps that S1, tissue sample treatment is conducted, specifically, about 1 g of tissue samples are weighed, 1 mL of PBS is added, the mixture is put into a grinding bowl to be ground into homogenate, the homogenate is transferred into a sterile centrifugal tube, and centrifugation is conducted for 3 min in a centrifugal machine at the speed of 12000 rpm / min; s2, extraction of viral nucleic acid: carrying out nucleic acid extraction on the virus by using a viral genome DNA / RNA extraction kit of a certain biochemical science and technology Co., Ltd; s3, primer design: retrieving a porcine parvovirus whole genome (GenBank ID: NC001718.1) in GenBank, determining a highly conserved fragment in the porcine parvovirus whole genome as a VP2 gene through analysis and comparison by Meglign software, designing a full-length primer of the VP2 gene by using Primer Premier 5 software, and designing a full-length primer of the VP2 gene according to the highly conserved fragment VP2 gene in the porcine parvovirus whole genome; the crRNA primer of the porcine parvovirus VP2 gene is designed by using Cpf1 primer design software in a CRISPR-DT website, and is entrusted to be synthesized and produced by a biological company.

An analog modulation technique where the message information is contained in the timing of phase reversal zero crossings in the transmitted signal. In the preferred implementation a bias signal is added to an information signal and the composite signal hard limited to produce a square wave. The square wave is used to switch the phase of a carrier signal so that phase reversals occur in correspondence with the change in polarities of the square wave. A demodulation technique is also disclosed.

The invention provides a training method and device of a sound detection model and a detection method of a sound event, and the training method of the sound detection model comprises the steps: obtaining a training sound signal, carrying out the feature extraction of the training sound signal, and building a two-dimensional feature map training set; and importing the neural network model into the two-dimensional feature map training set, and training the neural network model through a loss function based on a hidden Markov model to obtain a sound detection model. According to the embodiment of the invention, through the loss function defined based on the hidden Markov model, an occurring specific event can be identified through sound event detection, timely response can be made for the occurring event, personnel intervention is not needed, sound detection does not depend on experienced workers any more, on one hand, the detection efficiency is improved, and on the other hand, the detection time is shortened. On the other hand, the detection threshold is reduced, and the hearing of people is not damaged.

The invention discloses a method for identifying cultivated diamonds and natural diamonds by exciting fluorescence and phosphorescence with X-rays, which comprises a diamond to be detected, a camera for shooting, an X-ray generator for excitation and a control system, the method comprises the following steps: cleaning and wiping a tested diamond, and fixedly placing the tested diamond in front of an X-ray generator; x-rays are started under remote control, and the fluorescence luminescence condition of the diamond at the moment is photographed and recorded; the X-ray is closed under remote control, and after the X-ray is closed for several seconds, the phosphorescence luminescence condition of the diamond at the moment is photographed and recorded; according to the fluorescence condition of the tested diamond recorded in the step S2 and the phosphorescence condition of the tested diamond recorded in the step S3, judging that the tested diamond belongs to hot-pressed diamond, natural diamond or CVD diamond. According to the method, hot-pressed, CVD and natural diamonds can be quickly identified in a large scale, and the efficiency and the accuracy are high.

The field of the invention is that of fluorescence spectroscopic methods. In particular, the present invention relates to a fluorescence spectroscopic method and to several products that can be analyzed using this method.

Methods, devices, and processor-readable storage media are provided for detecting spontaneous ventricular events in a heart using implantable medical devices. A method in this context includes applying a sensitivity function to collected data to detect occurrence of ventricular events. The sensitivity function is based on an adjustable detection threshold. The method further includes determining whether noise is suspected to be present in the data and, if so, increasing the threshold. The method further includes providing a stimulation pulse to the heart when a ventricular event has not occurred after a predetermined escape interval and, following the stimulation pulse, applying a capture test to detect whether an induced depolarization has occurred. If induced polarization is not detected, the threshold is reduced, while the threshold is maintained if induced polarization is detected.