82results about How to "Difficult to measure" patented technology

The present invention relates to an anklebone healing robot, which comprises a mechanical part, a control part and a display part. The mechanical part comprises a pedestal and a movable platform. Three fork chains with the same structure and a central restricting rod with a central spherical pair are uniformly distributed and arranged between the pedestal and the movable platform in parallel. Each fork chain consists of a rotating pair, a lower spherical pair, a connecting rod and an upper spherical pair. The upper end of the central restricting rod is connected with the center of the movable platform by a spherical hinge. Three pieces of same bent plates are uniformly distributed and fixedly arranged at the pedestal. Three moment motors with same specification are respectively arranged at the three bent plates and are respectively in driving connection with the rotating pairs of the three fork chains. The movable platform is equipped with a footplate. A three-dimensional or six-dimensional force/moment sensor is arranged between the movable platform and the footplate. A shaft of the rotating pair is equipped with a position sensor. The control part comprises a computer and corresponding software, a multi-spindle movement control card and a driver. The software comprises a healing software realizing the interaction with the patient, and the healing software comprises three subsystems of healing exercise, information feedback and function evaluation.

Some embodiments of the present invention provide methods and apparatuses for improving the performance and utility of breath alcohol measurements through the use of multivariate spectroscopy. In some embodiments, the spectroscopic breath measurement can be combined with multivariate spectroscopic tissue alcohol and/or tissue biometric measurements in order to overcome the limitations encountered by existing breath alcohol measurement devices.

A hybrid calibration method uses an calibration phantom (exterior reference) scanned simultaneously with the patient, and one or more known tissues of the subject (interior reference) to create a hybrid calibration reference that improves the measurement of tissue densities throughout the body. In addition, the calibration method is used to quantitatively define boundaries of tissue and organs for more accurate measurements of lengths, areas and volumes. Another aspect of the invention uses the calibrated images to quantitatively preset absolute window/levels for filming and image display, which provides standardized viewing for diagnostic purposes.

A bottom hole assembly (BHA), adapted to be positioned in a casing and to isolate a portion of a wellbore, which includes a packer assembly with a first sealing element extending between first and second portions of the packer assembly. A method of setting a BHA in a casing which includes increasing a BHA pressure to activate an anchor assembly, applying a mechanical force to mechanically deform a first sealing element to thereby establish an initial seal between the first sealing element and an interior surface of the casing, and increasing a pressure in a space between the BHA and the casing and in a cavity within the BHA to increase a differential pressure across the first sealing element and thereby establish a pressure-energized seal between the first sealing element and the interior surface of the casing.

A portable articulated arm coordinate measurement device is provided. The coordinate measurement device includes a base and an articulated arm portion having at least one arm segment. A biasing member is coupled on a first end to the base and on a second end to the articulated arm portion. The first end of the biasing member is movable between a first position and a second position. An adjuster is coupled between the base and the biasing member. The adjuster is coupled to move the first end of the biasing member from the first position to the second position.

The invention provides a calibration method and calibration system for the amplitude phase error of a satellite-borne DBF (Digit Beam Forming) transmitting channel. The calibration method and the calibration system respectively comprise two levels of calibration schemes, and the two levels of calibration schemes are composed of output Butler front-end channel part amplitude phase calibration and output Butler rear-end channel part amplitude phase calibration. The method comprises the following steps of: firstly, injecting a calibration signal after inputting the Butler, and coupling the calibration signal at a test port which transmits the Butler, thereby realizing the calibration of a frequency mixer and a power amplifier; and then, keeping the original calibration signal injection mode, and receiving the calibration signal through a far field, thereby realizing the calibration of a filter and a feed source array. Through the method and system provided by the invention, the measurement accuracy of the amplitude phase error is improved greatly, so that the method and the system can be used for effective loads of communication satellites, detection satellites and navigation satellites, and also can be used in the technical fields of ground radars and the like.

A body 1 placed thereon with a table 35 put thereon with an object to be measured W, and a portal frame 41 supporting both ends of rail 43 to the body through pillars 42A and 42B, the rail being placed above the table 35 and extending along a moving direction of a pair of probes 91A and 91B, are provided. A pair of sliders 51A and 51B are movably supported by the rail 43. The pair of the probes are extended downward from the sliders 51A and 51B to be abutted to the object W put on the table 35. The flexural deformation of the probes 91A and 91B is decreased due to the shorter length of the probes 91A and 91B, so that the high accurate measurement is achieved and a relative measurement is omitted.

A method of relocating a portable articulated arm coordinate measuring machine (AACMM) from a first location to a second location, wherein the AACMM has, at the first location, a first origin point and a first frame of reference and, at the second location, a second origin point and a second frame of reference, the method including the steps of: measuring an amount of tilt of the portable AACMM along two perpendicular directions, each of which are approximately perpendicular to a gravity vector, with the portable AACMM in each of the first and second locations; measuring a first target and a second target with the portable AACMM in the first location to obtain, in the first frame of reference, a first set of x, y, and z coordinates and a second set of x, y, and z coordinates; measuring the first target and the second target with the portable AACMM in the second location to obtain, in the second frame of reference, a third set of x, y, and z coordinates and a fourth set of x, y, and z coordinates; and finding x, y, and z coordinates of the second origin point with respect to the first frame of reference, wherein the x, y, and z coordinates of the second origin point are found using the first, second, third, and fourth sets of x, y, and z coordinates but without using additional x, y, and z coordinates of a third target measured with the AACMM at the first location and at the second location.

The invention discloses a double-redundancy permanent magnet synchronous motor coil inter-turn short-circuit online detection method. The method is based on the principle that the impedance of a residual normal winding where a fault exists is reduced during inter-turn short-circuit of a coil, that is, when a motor works under a double-redundancy operation mode, if the inter-turn short-circuit happens to the coil, the equivalent resistance and inductance parameters in a Park equation of a winding where the fault exists have certain reduction, and currents of the two windings are basically the same, so that direct-axis voltages of the two windings have a certain deviation. By means of the plus or minus average value and the absolute value of the difference between the direct-axis given voltages of the two windings of first several DSPs in each PWM sampling control period, and motor operation state judgment made through the rotation direction of a motor permanent magnet rotor and the plusor minus quadrature-axis given current, to which three-phase winding the coil inter-turn short-circuit fault happens is online diagnosed between different phases of windings under the double-redundancy operation mode of an electromagnetic-coupling-free low-thermal coupling double-redundancy permanent magnet synchronous motor.

The present invention belongs to the field of electric power transmission, and is especially live detection method of synthetic insulator fault and zero value insulator in high voltage DC power transmission line. The detection method includes the steps of: detecting the AC harmonic electric field distribution around the insulator; comparing with standard electric field distribution; and judging whether the insulator is normal or in fault based on whether to have obvious difference between the two distributions. The present invention facilitates the detection of insulator in high voltage DC power transmission line with voltage level as high as 500 KV and has relatively high sensitivity.

Disclosed is a method and apparatus for measurement of the derivative of acceleration with respect to time (jerk) and the use of demodulation to analyze the jerk signal. The sensor used to measure jerk consists of a piezoelectric transducer coupled with an amplifier that produces a voltage or current signal that is proportionate to jerk. In applications including rolling element bearing diagnostics, demodulation is used to measure changes in the jerk signal over time.

The invention provides an analysis method for impurity elements in tin-oxide-containing nanopowder, and aims to solve the problem that the tin-oxide-containing nanopowder is not easy to decompose by adopting an inductive coupling plasma atomic emission spectroscopy method and selecting the reagent type, dosage and method adopted for the dissolving sample of the tin-oxide-containing nanopowder; experiment interference is eliminated by selecting acid conditions and instrument parameters, thereby solving the difficulties that tin and antimony are easy to hydrolyze, interference elements are more and difficult to test and test background value is high and the like; with the method, the detection limit is below 0.003%, the relative standard deviation is within 10%, the method correlation coefficient is above 0.998, and the recovery rate is between 85% and 130%; and the analysis speed is high, the data is accurate, the errors meet conventional requirements, and the quality and the performance stability of the tin-oxide-containing nanopowder can be ensured.

The invention relates to a method and a device for inspection measurement of a fan-shaped section base of a continuous casting machine. The method comprises the following steps of putting a false axis into a U-shaped base for positioning, measuring arc fan-shaped sections and straight fan-shaped sections by measuring parameters such as false axis elevation, and measuring the fan-shaped section base by the device, wherein in the measurement, error compensation is carried out. The device can simulate the fan-shaped sections. The method is easy, is convenient for operation, realizes accurate and fast measurement, and shortens a construction period. According to the method, in positioning U-shaped base 5 measurement adjustment of the first arc fan-shaped section, a reference-point casting machine tangent point line is needed; and in positioning U-shaped base measurement adjustment of other fan-shaped sections, only an inside micrometer, a level instrument and an indium steel rule are needed so that the reference-point casting machine tangent point line use is avoided in the positioning U-shaped base measurement adjustment of other fan-shaped sections.

Provided are a method of analyzing a target substance to be measured, the method including: dividing a surface of a measuring unit of a CMOS image sensor into a plurality of pixels, directly fixing a bioreceptor onto the surface of the measuring unit of the CMOS image sensor, and measuring chemiluminescent signals depending on concentrations of the target substance to be measured, and a CMOS image sensor applied to the same.

The present invention relates to fluorescent or luminescent probe reagents for measuring oxidative stress in a cell or an organism. Examples of the probe reagents include: a fluorescent or luminescent protein and a marker protein; a fluorescent or luminescent protein, a marker protein, and a regulatory factor; or a fluorescent or luminescent protein, a marker protein, a cleavage sequence, and a regulatory factor. In the probe reagents, the marker protein makes it possible to detect the oxidative stress caused by reactive oxygen species and comprises a regulatory factor-binding site and a ubiquitin-binding site; and the regulatory factor is a protein making it possible to regulate degradation of the marker protein in response to the reactive oxygen species. The present invention also relates to a method of measuring oxidative stress in a cell or an organism, or a method of screening a substance which suppresses or promotes the oxidative stress in a cell or an organism by using the probe reagent.

The invention discloses a method for measuring the shrinking percentage of an inner cavity of a hollow casting. The method is applied to measurement on the size change of the inner cavity of the blade in a manufacturing process of an air-cooling blade, aiming at solving the problem that the size change of the inner cavity of the blade cannot be measured in the prior art. The method comprises the following steps: firstly, designing an analog sample piece of the hollow casting, secondly, designing a core mold and an outer mold of the analog sample piece, and subsequently manufacturing the analog sample piece according to the manufacturing process of the blade, wherein quality control requirement on the analog sample piece is consistent with that on a real casting; after reinforcement at high temperature, measuring the three-dimensional sizes of a core of the prepared analog sample piece; and subsequently, reinforcing at low temperature, manufacturing a wax mold, manufacturing a molding shell, casting, cooling down and subsequently cutting the analog sample piece according to measurement lines, measuring the inner cavity of the casting, and finally measuring and calculating the shrinkage percentage. By adopting the method, the precision of the size of the inner cavity of a turbine blade is ensured, and the pass percent of the casting is increased.

A sheet pressure sensor includes a first fiber layer, a second fiber layer, and a third fiber layer provided between the first and second fiber layers. The third fiber layer has connecting yarns that electrically connect first conductive portions of the first fiber layer and the second conductive portion in the second fiber layer with a predetermined electric resistivity. The sheet pressure sensor further includes a measuring instrument for measuring electric resistance between at least one of the first conductive portions and the second conductive portion. The connecting yarns unstrain due to deformation of the first or second conductive portion which is generated by applied pressure, and then are short-circuited with one of them. The sheet pressure sensor can detect the pressure while keeping air ventilation characteristic by giving a pressure detection function to the fiber layers.

A downhole acoustic logging tool uses a phased-array of transmitters and/or receivers to improve the signal level of compressional waves generated by the transmitters and propagating in the formation. It is emphasized that this abstract is provided to comply with the rules requiring an abstract which will allow a searcher or other reader to quickly ascertain the subject matter of the technical disclosure. It is submitted with the understanding that it will not be used to interpret or limit the scope or meaning of the claims.

The invention provides a method for measuring roundness of a large cylinder. The method comprises the following steps: 1) determining the position of a central axis of a cylinder, establishing a coordinate system with the central axis of the cylinder being an axis, and calibrating coordinates of cylinder center datum mark points on the cylinder through a datum transformation method; 2) setting cylinder roundness measurement control points and carrying out measurement; and 3) establishing a cylinder roundness measurement local area network and measuring the roundness of the cylinder. An absolute laser tracker is introduced, so that under the condition of narrow and small space and hard datum point measurement, the roundness of super-large cylinders, such as a hydro-generator rotor and a stator, can be measured, and measurement accuracy and reliability are improved.

A biological sample solution is ionized by electrospray and the sample solution is irradiated with an infrared laser beam to dissociate biological macromolecules into the constituents thereof. As a result, only non-covalent bonds of the biological macromolecules can be selectively severed and analyzed.

Provided herein are nucleic acid-based nanoswitches that can detect specific nucleic acids and other analytes types by for example a simple gel electrophoresis readout. Binding of the target to the nanoswitches induces a conformation change from a linear, open conformation to a looped, closed conformation. These nanoswitches may be used in diagnostic assays such as nucleic acid-based diagnostic assays, to detect, measure and/or purify a variety of targets including low abundance targets.