156results about How to "Accurate and efficient measurement" patented technology

A method of diagnosing pulmonary congestion is provided. At least one decrease in a trans-thoracic impedance value from a baseline trans-thoracic impedance value is sensed. At least one increase in a heart rate value from a baseline heart rate value is also sensed. Pulmonary congestion is diagnosed if the decrease in the trans-thoracic impedance value corresponding to the increase in the heart rate does not increase after a predetermined interval. Systems and programs incorporating the method are also provided.

A sensor designed to determine the amount and concentration of analyte in a sample having a volume of less than about 1 μL. The sensor has a working electrode coated with a non-leachable redox mediator. The redox mediator acts as an electron transfer agent between the analyte and the electrode. In addition, a second electron transfer agent, such as an enzyme, can be added to facilitate the electrooxidation or electroreduction of the analyte. The redox mediator is typically a redox compound bound to a polymer. The preferred redox mediators are air-oxidizable. The amount of analyte can be determined by coulometry. One particular coulometric technique includes the measurement of the current between the working electrode and a counter or reference electrode at two or more times. The charge passed by this current to or from the analyte is correlated with the amount of analyte in the sample. Other electrochemical detection methods, such as amperometric, voltammetric, and potentiometric techniques, can also be used. The invention can be used to determine the concentration of a biomolecule, such as glucose or lactate, in a biological fluid, such as blood or serum. An enzyme capable of catalyzing the electrooxidation or electroreduction of the biomolecule is provided as a second electron transfer agent.

A refractometer for measuring refractive index of a sample comprising a prism having an interface contacting the sample, a light source that radiates light towards the interface from an entrance face of the prism, and a photoelectric sensor for receiving light reflected at the interface and directed outward from an exit face of the prism. The light source and the photoelectric sensor are secured to the prism. The refractometer comprises a sample stage arranged surrounding the interface surface. This sample stage provides a non-adhesive coating formed on the surface thereof. The refractometer comprises filter means arranged between the interface surface and the photoelectric sensor. This filter means includes a wavelength filter that selectively allows transmission of light having a wavelength within a prescribed region, including a wavelength of light of the light source.

A refractometer for measuring refractive index of a sample comprising a prism having an interface contacting the sample, a light source that radiates light towards the interface from an entrance face of the prism, and a photoelectric sensor for receiving light reflected at the interface and directed outward from an exit face of the prism. The light source and the photoelectric sensor are secured to the prism. The refractometer comprises a sample stage arranged surrounding the interface surface. This sample stage provides a non-adhesive coating formed on the surface thereof. The refractometer comprises filter means arranged between the interface surface and the photoelectric sensor. This filter means includes a wavelength filter that selectively allows transmission of light having a wavelength within a prescribed region, including a wavelength of light of the light source.

The invention relates to a device suitable for the investigation of ligand-receptor interactions, in particular for the investigation of an analyte target interaction such as biological and chemical molecules and organic components and their interaction with surfaces, consisting of an attenuated total internal reflection element, transparent in the infra-red and of which at least one surface is chemically activated and covalently grafted with an organic molecule able to immobilize the receptor. The invention further relates to the use of said device and a method for the construction of said device comprising the steps of: surface activation of at least one surface of an attenuated total internal reflection element; surface grafting with an organic molecule of the activated surface obtained in the previous step; and coupling a receptor via covalent fixation on the organic molecule.

Disclosed herein is a method and apparatus used to the measure duty cycle of a clocking waveform utilizing minimal hardware and achieving high accuracy. This invention utilizes digital sampling of the signal to be measured at a rate that can be significantly lower then the clocking frequency of the signal to be measured. It accomplishes broad-band, multi-frequency use by using a time-varying frequency for the sampling clock to make sure that the sampling clock is asynchronous with the frequency of the clocking signal to be measured. The average ratio of the sampled ones (or zeros) as compared to the total number of samples is then computed to derive the measurement of duty cycle.

The invention relates to a two-tone femtosecond laser collinear pumping detecting thermal reflection system which comprises a polarization output pulse laser, a wave plate, a beam splitting element, a reflecting mirror, an electro-optical modulator, a frequency doubling crystal, an optical filter, a beam expander, an electronic control displacing platform, a cold-light mirror, a fixing adjusting frame, a focusing lens, a photoelectric detector and a filter amplifier, wherein the polarization output pulse laser is used for outputting a pulse laser; the wave plate is used for causing the laser to rotate along a polarization direction; the laser beam is divided into two mutually vertical beams along the polarization direction by the beam splitting element; the laser beam is received and reflected by the reflecting mirror; the laser beam is modulated by the electro-optical modulator; the frequency doubling crystal is used for causing the laser to generate second harmonics; the laser within an appointed wavelength interval is filtered by the optical filter; the diameter of the laser beam is expanded by the beam expander; the electronic control displacing platform can move back and forth; the laser beams with different wavelengths are combined by the cold-light mirror; a sample is fixed by the fixing adjusting frame; the laser is irradiated on the surface of the sample by the focusing lens; the photoelectric detector is used for receiving the laser passing through the optical filter and generating an electric signal; and the signal of the photoelectric detector is amplified by the filter amplifier. According to the two-tone femtosecond laser collinear pumping detecting thermal reflection system, femtosecond pulse lasers with different wavelengths are applied to pumping light and detecting light; the pumping light after being subjected to frequency doubling is filtered by the optical filter with high selective permeability; the interference of the pumping light to a detecting signal is avoided; and the accurate high-efficient measurement is realized.

An antler scoring system for enabling efficient and accurate measurement of antlers. The antler scoring system includes a housing, a wheel member rotatably attached to the housing, a central processing unit within the housing in communication with the wheel member, a ruler extendably positioned within the housing, and an idler roller positioned within the neck of the housing opposite of the wheel member with the ruler positioned between thereof. When the idler roller is engaged, the ruler is measured by the wheel member. The ruler preferably includes an engaging member that has a side opening for receiving a portion of the ruler during measuring of the antler circumference and inside spread.

The invention discloses a machine vision-based cutter type discrimination and geometric parameter detection method and system. The method specifically comprises the following steps of: performing detection initialization; installing a cutter on a machine tool spindle, and recording coordinates of the cutter under a machine tool coordinate system; acquiring a cutter dynamic image; identifying the acquired cutter dynamic image by adopting a cutter identification model trained by a convolutional neural network, and judging the type of the current cutter; measuring a geometric dimension of the identified cutter; when the geometric dimension of the cutter is measured, the geometric parameters of the common cutter are mainly measured, the obtained cutter type and the obtained geometric dimension of the cutter are compared with the cutter type and the geometric dimension of the cutter in the current processing file, and corresponding early warning information is sent out when the cutter type or the geometric dimension of the cutter is inconsistent; the automation degree of the machine tool machining process is effectively improved, measurement is efficient and accurate, the problem of cutter replacement errors is solved, large losses are avoided, measurement of various common cutter parameters is considered, and the application range is wide.

A volumetric solid and liquid dispenser includes a drum sized for receiving and containing a predetermined volume of solid material from a solid material supply source. The supply source can be a hopper positioned above the drum. The drum is rotatably mounted to a support frame and can be rotated from a position in which it receives solid material from the supply source to a dispensing position in which it dispenses the solid material into a receptacle below. A liquid metering and dispensing assembly dispenses a predetermined volume of liquid into the receptacle for mixing with the solid material. The invention is particularly useful for dispensing predetermined volumes of sand and water into a cement mixer for mixing with mortar. The invention can include a lifter assembly for lifting material to be poured into the mixer, and a cover assembly for covering the top of the hopper.

The invention discloses a pedal unit testing system and a control method thereof. The system comprises a clamp and a pedal detection mechanism; a pedal unit is fixed by the clamp; the pedal detection mechanism comprises a servo motor, the servo motor drives a screw to rotate, the screw drives a testing push rod to move forwards or backwards, and the testing push rod pushes a pedal of the pedal unit to rotate; the testing push rod is provided with a pressure sensor, and the pressure sensor is used to detect the resistance of the pedal; an output shaft of the servo motor is provided with a rotation encoder, and the rotation encoder is used to detect displacement of the testing push rod; and the servo motor, the pressure sensor and the rotation encoder are all connected to a data processor, and the data processor reads output data of the pressure sensor and the rotation encoder and combines a screw lead with a pedal fixation parameter to calculate and output the rotation angle and resistance data of the pedal. According to the invention, the rotation angle and resistance of the pedal can be measured accurately and efficiently, and a test process is controlled by software and runs automatically.

A microscope for investigating the lifetime of excited states in a sample has a light source that generates excitation light, and has a detector that receives detected light proceeding from the sample. The light source contains a semiconductor laser which emits pulsed excitation light. An adjusting apparatus is provided for adjusting the pulse repetition rate to the specific lifetime properties of the sample.

A multilayer printed wiring board having a compact test coupon formed on each of the signal wiring layers is provided, and accurate and efficient method of characteristic impedance measurement for each signal wiring layer is realized. The test coupon is constituted by a plurality of linear parts extending parallel to each other and folded-back parts mutually connecting the linear parts. A through hole is provided for serially connecting the respective test coupons of the signal wiring layers adjoining each other. Two measuring pads, one is connected to one end of the serially connected test coupons and another is connected to the ground layer, are also provided. The measurement is performed by applying a step pulse between two measuring pads and measuring voltages of reflection waves from the serially connected test coupons.

The invention provides an algorithm system applicable to image classification and image retrieval. The algorithm mainly comprises image modeling and and image matching modules. During image modeling, for improving characteristic description capability, a deep convolution neural network is utilized to extract depth characteristics of an image for the first time, and the hybrid Gauss model is utilized for modeling to represent the image on the basis; during image matching, for two problems of efficiency of a soil moving distance algorithm and noise sensitivity, the accurate, efficient and improved soil moving distance algorithm is proposed, Gauss noise and sparse constraints are additionally considered in an algorithm design process, moreover, through the improved designed soil moving distance algorithm, design defects of a geodesic distance measurement algorithm in the prior art are solved, after a Riemannian geometric structure of Gauss distribution is considered, three types of geodesic distance measurement modes are designed, Gauss distribution distances can be accurately measured.

The present invention provides a fructosylamine oxidase which is obtainable by culturing Fusarium proliferatum, and purifying two types of fructosylamine oxidase (FAO) with different substrate specificities from the culture, and which is useful in the measurement of amadori compounds.

The embodiment of the invention provides a method and apparatus for measuring eye parameters. The method includes: obtaining a shot image of the eye, wherein the shot image comprises a shot photo anda medical detection image; recognizing a cornea and an eyelid of the eye in the shot image, and generating a mark line for marking the distance between an end point of the cornea and a corresponding end point of the eyelid according to the cornea and the eyelid; determining a first pixel number, occupied in the shot photo, of the mark line as a first measuring result of an eyelid retraction amount; recognizing the medical detection image to obtain a bone structure of the eye; determining a portion enclosed by the bone structure as a to-be-segmented target; obtaining an image grayscale value ofthe to-be-segmented target, and extracting segmented eye muscle according to the image grayscale value; and determining a measuring result of an eye muscle cross-sectional area according to a secondpixel number occupied by the eye muscle and a preset corresponding relation. The apparatus executes the above method. According to the method and the apparatus, the eye parameters can be objectively and accurately measured with high efficiency.

An image forming apparatus includes: an image forming section that forms an image; and an image forming control section that acquires information on a detection result of the image by a first image detecting section which has relatively higher failure detection accuracy than that of a second image detecting section, and information on a detection result of the image by the second image detecting section which has relatively higher color measurement accuracy than that of the first image detecting section, wherein the image forming control section acquires second image detection information in a region that has been detected by the second image detecting section and in which an exclusion detection region has been removed, based on the exclusion detection region that has been determined to contain a failure in the image, by first image detection information based on the detection result of the first image detecting section.

There is provided a forging die holder including a resistance heater capable of efficiently heating a die via the die holder when warm forging or hot forging is performed. A die holder is for holding a die used in a forging press for performing warm forging or hot forging. The die holder has heater mounting holes into which resistance heaters are inserted, sensor mounting holes into which temperature sensors are inserted, and guide portions disposed on both end portions of holder surfaces of holders for supporting back surfaces of the foregoing die to support side surfaces of the foregoing die located therebetween on both sides thereof. The heater mounting holes are formed at positions opposing the holder surfaces in aligned relation with the side surfaces of the foregoing die.

A digital envelope detector (consisting of both hardware and software) that provides accurate measurements of changes of peak values of an AC signal (these peak values constitute the envelope of a signal). Such accurate envelope measurements are required, e.g., to optimize the accuracy and selectivity of chemical sensors. The envelope values required for these sensors can not be obtained with common instruments (e.g. voltmeters) since these meters require that successive peaks be the same amplitude. Therefore, they can not measure the envelope of a gradually increasing or decreasing AC signal from the chemical sensors. The only possible alternative to this invention is high speed, high resolution analog-to-digital conversion (ADC) followed by extensive statistical analysis. The ADC method is much more expensive, slower, and excessively complicated compared to the invention. The invention works as follows: A signal of interest is compared to each of a set of accurately calibrated reference (or threshold) voltages provided by a digital to analog converter. A digital logic circuit and software respond each time the signal fails to exceed the current reference voltage. In that event, relevant data (e.g. time or cycle count) are digitally recorded and a new reference voltage is installed. The process is repeated until the desired range of change of the signal is measured. The result is a set of amplitudes as a function of time and / or cycle that fully and accurately describe the desired portion of a signal envelope.

A sensor for measuring a protein with a measurement speed improved from a conventional impedance measurement, using a biosensor is provided. The sensor is capable of efficiently and accurately measuring impedance generated by a selective binding to the protein by Fourier-transforming an electric current signal which is obtained by applying a potential signal of a delta function waveform.The device for measuring a protein using a biosensor includes the biosensor including a sample inlet through which a sample is drawn in, a working electrode on which a receptor layer is coated for selective binding to the specific protein in the drawn sample, and a measuring unit including a reference electrode to form a potential difference with the working electrode, a function generator which applies a potential signal in the form of delta function to the working electrode and the reference electrode, and a data processing unit which measures impedance of the working electrode by Fourier-transforming an electric current obtained in response to the delta function waveform.Accordingly, with the device for measuring a protein using a biosensor is capable of measuring concentration of the protein with accuracy, measurement time is shortened and the concentration of protein can be accurately measured by removing the influence of dispersion.

An actual plate thickness and actual material constants are measured during punching before bending. The measured information is reflected on the bending, so that the bending is performed efficiently and accurately. Punching is carried out for each blank developed based on a nominal plate thickness and nominal material constants in blanking before the bending of a work W. Then, an actual plate thickness distribution and an actual material constant distribution of the work W are calculated based on various data containing a ram stroke and a pressure detected in the punching.

A device to measure the amount of ultraviolet (UV) light that can transmit through a water sample, relative to the amount of UV light that can transmit through a sample of known UV transmittance. The measurement is known in the industry as UV percent transmittance (UVT). UVT can also be represented as UV absorbance (UVA) with the use of a simple mathematical calculation. UVT and UVA are essentially just different expressions of the same measurement. Preferably the sample of known UV transmittance (blank sample) has a UVT of 100%. A single UV sensor is used to measure the amount of UV light that transmits through the blank sample and through the water sample under test. In order to maintain accuracy, compensation must be made for fluctuations or drift in the UV lamp output. Such fluctuation and drift is very common in UV lamps and is due primarily to changes in temperature and imperfections in the ballast and lamp. Therefore the UV sensor measures the amount of light being emitted by the lamp at the times before and / or after the UV sensor measures the amount of UV light that transmits through the blank sample and the water sample. A microprocessor is used to compute the UVT which is calculated as the UVT of the water sample under test divided by the UVT of the blank sample while using the detector readings to compensate the calculated UVT for any drift and fluctuations in the UV lamp output.

The invention relates to a multi-channel electro-acoustic transfer function measurement method and belongs to the technical field of electro-acoustic transfer function measurement. The multi-channel electro-acoustic transfer function measurement method includes that L loudspeakers and M microphones are arranged in a space to form an electro-acoustic transfer system; any one loudspeaker l in the electro-acoustic transfer system is independently controlled by an excitation electric signal el (t) of the loudspeaker l; sounds generated by all the loudspeakers are obtained through simultaneous measurement of the M microphones, and the mth microphone measures a sound pressure signal pm (t); the transfer relation between the loudspeaker excitation electric signal el (t) and the sound pressure signal pm (t) measured by the microphone is defined to be a transfer function; and the loudspeaker excitation electric signal el (t) controls the loudspeakers to generate sounds, and the transfer function is calculated by measuring the sound pressure signal pm (t) and the loudspeaker excitation electric signal el (t). The multi-channel electro-acoustic transfer function measurement method is comparable to a simple-frequency signal method in measurement accuracy, and simultaneously has the advantage of high efficiency.

The invention discloses a dial protractor and a using method thereof. The dial protractor comprises a dial disc and a swing needle which is fixed on the dial disc. The dial protractor is characterized in that the dial disc comprises an inner dial disc and an outer dial disc; the center of the inner dial disc is provided with a central rotary shaft which is connected with the swing needle; the whole swing needle is of an ellipse shape; the upper part of the swing needle is of a hollow closed structure thinner in upper part and wider in lower part; the swing needle is fixed at the peak of the closed structure thinner in upper part and wider in lower part; a heavy hammer is fixed at the bottom of the swing needle; the inner dial disc is fixed at the center of the outer dial disc, and is of a flat top conical shape; and a transition structure with gradient is formed between the inner dial disc and the outer dial disc. The using method comprises the following steps: (1) placing a cushion ruler on a plane to be measured; (2) sticking one side of the dial protractor and the surface of the cushion ruler tightly according to the direction of the measured angle; and (3) taking the included angle between the zero graduation line of the inner dial disc and the indicator direction as the angle need to be measured when the swing needle is static. The dial protractor and the using method provided by the invention can be used for measuring any gradient angle accurately and efficiently in the construction process and acceptance checks and are used for checking measured angles of the horizontal and vertical planes.

The invention relates to a method and a device for measuring the eccentric distance of a small pole. In the method for measuring the eccentric distance of the small pole, a rolling unit, an image pickup unit and an image processing unit can be used for measuring the eccentric distance of the small pole to be measured. The method for measuring the eccentric distance of the small pole disclosed by the invention comprises the following steps of: putting the pole body of the small pole to be measured onto the rolling unit, and rotating the small pole to be measured around a pole axle center of the pole body; continuously picking up a plurality of image data by using the image pickup unit, and transmitting the image data to the image processing unit; calculating an approximate circle by using the image processing unit, wherein the circle center of the approximate circle is equivalent to the position of the pole axle center; and displaying the length of an approximate circle radius of the approximate circle on a display module of the image processing unit, wherein the length of the approximate circle radius is the eccentric distance of the small pole to be measured.