33results about How to "Satisfy Compensation Requirements" patented technology

For resonance image data of an imaged subject, a method that first detects and estimates the dominant motions of k-space data (i.e., the motion vectors) and then constructs a graphical model for each estimated motion vector. The segments of the k-space that are determined to be corrupted by motion are restored by minimizing the energy associated with the corresponding graphical model. Consequently, the MR image of the imaged subject becomes free of motion artifacts.

An internal combustion engine control device is configured to take a fuel property into account when compensating for torque decline that occurs when a prescribed combustion control mode is executed. The internal combustion engine control device is configured to calculate a first modification coefficient designed to modify a first torque correction coefficient corresponding to a air-fuel ratio based on the specific gravity of the fuel, a second modification coefficient designed to modify a second torque correction coefficient corresponding to a working gas quantity based on the specific gravity of the fuel, and a third modification coefficient designed to modify a third torque correction coefficient corresponding to a fuel injection timing based on an aromatic component content ratio of the fuel. The internal combustion engine control device is then configured to multiply the first, second and third modification coefficients together to calculate a modification coefficient for modifying a torque correction value.

In a distortion compensation device which uses distortion compensation coefficients to subject distortion compensation processing to an input signal and supply the result of the distortion compensation processing to a distorting device, calculates the distortion compensation coefficients based on the input signal before distortion compensation and the feedback signal fed back from the output side of the distorting device, and stores the calculated distortion compensation coefficients in association with the input signal, (1) the feedback signal is AD-converted; (2) the AD-converted output is subjected to fast Fourier transform (FFT) processing; (3) the FFT calculation result is used to calculate the value of either the signal-to-noise ratio SNR, or the adjacent channel leakage power ratio ACLR, or the noise level; (4) the delay time occurring in the distorting device and feedback loop is adjusted such that the difference between the above calculated value at the current time and the above calculated value at the immediately preceding time is either zero, or is equal to or less than a threshold value; and, (5) this adjustment processing is repeated to determine the accurate delay time, and based on this delay time the timing of each of the portions of the distortion compensation device is adjusted.

An electron microscopy system and an electron microscopy method for detection of time dependencies of secondary electrons generated by primary electrons is provided, in which the primary electron pulses are directed onto a sample surface and electrons emanating from the sample surface are detected, time resolved. To this end the system comprises in particular a cavity resonator. A cavity resonator can also be used to reduce aberrations of focusing lenses.

A zoom lens system comprising a first lens unit of negative power, a second lens unit of positive power and a third lens unit of positive power, wherein in zooming, the lens units move respectively along an optical axis so that an interval of first lens unit and second lens unit decreases while an interval of second lens unit and third lens unit changes with variable magnification, the first lens unit comprises one object side negative lens element and one image side positive lens element, which have an aspheric surface, and the conditions: n 12>1. 88, ν12<26 and 5.0<αi_W<20.0 (ω_W>30, n12 and ν12 are refractive index and Abbe number, respectively, of the image side positive lens element of the first lens unit, αi _W is an incident angle of the principal ray onto the image sensor at the maximum image height at a wide-angle limit) are satisfied.

A zoom lens system comprising a first lens unit of negative power, a second lens unit of positive power and a third lens unit of positive power, wherein in zooming, the lens units move respectively along an optical axis so that an interval of first lens unit and second lens unit decreases while an interval of second lens unit and third lens unit changes with variable magnification, the first lens unit comprises one object side negative lens element and one image side positive lens element, which have an aspheric surface, and the conditions: n12>1.88, ν12<26 and 3.0<f₃/f_W<5.5 (ω_W>30, n12 and ν12 are refractive index and Abbe number, respectively, of the image side positive lens element of the first lens unit, f₃ is a composite focal length of the third lens unit, f_W is a focal length of the entire zoom lens system at a wide-angle limit) are satisfied.

A directional valve for controlling an actuator by means of pressurized medium, including: a spool fitted to move axially inside the directional valve; a first position of the spool, in which the spool tends to be set; and a second position of the spool, to which the spool can be moved by a pilot control force. Additionally, the directional valve includes a metering orifice placed in the pressure port or in the first work port or in the second work port or in the tank port, and across which a pressure difference is effective. The spool further includes a second position, to which the spool can be moved by a pilot control force. When the spool is in at least the second position, the directional valve is fitted to generate a compensating force proportional to said pressure difference, to move the spool to compensate for the flow.

A method of compensating for eddy currents induced by the switching on and off magnetic fields in gradient coils in NMR imaging apparatuses, which method includes at least one compensation cycle including the steps of performing at least one detection of the magnetic field generated by the current flowing in a gradient coil, i.e., a gradient field; extrapolating the course of the effectively generated gradient field from the data of said at least one detection; generating a gradient fields excitation current compensating the eddy current effects on the gradient fields on the basis of the comparison of the effectively generated gradient fields and of the target gradient field.

The invention relates to an engine test propellant supply low frequency ripple suppression method and system. Accurate helium injection is performed on the propellant supply pipeline, the inherent frequency of the propellant supply system is changed through gas mixing, and the ripple of the propellant can be adjusted through accurate control of the injection gas volume, the gas distribution and the injection gas form and the coupling situation of the propellant supply system and the engine can be reduced. With application of the method, the propellant supply ripple can be reduced, the propellant supply stability can be enhanced and thus the stability of the whole engine pump system can be enhanced. The method and the system are applied to the engine test.

A zoom lens system comprising a first lens unit having negative power, a second lens unit having positive power and a third lens unit having positive power, wherein in zooming from a wide-angle limit to a telephoto limit, the lens units move respectively along an optical axis in such a manner that an interval between the first lens unit and the second lens unit decreases while an interval between the second lens unit and the third lens unit changes so that variable magnification is achieved, the first lens unit comprises one object side negative lens element and one image side positive lens element with a convex surface facing the object side, which have an aspheric surface, and the conditions: n12>1.88 and ν12<26 (n12 and ν12 are refractive index and Abbe number, respectively, of the image side positive lens element of the first lens unit) are satisfied.

The invention relates to a self-locking type shutter device with high impact resistance, which includes an image sensor support, separation blades, acting arms and driving motors, wherein a photosensitive window is arranged at the middle part of the image sensor support; the separation blades are provided with sliding grooves, and can be rotationally mounted on the image sensor support through separation blade shafts, and the separation blades can completely shield the photosensitive window when closed, and are within the range of the image sensor support when opened normally on two sides of the photosensitive window; the acting arms are rotationally mounted on the image sensor support through rotating shafts, and are provided with convex columns which are arranged at one end of each acting arm respectively, pass through the sliding grooves of the separation blades, and can slide along the sliding grooves; the connection lines between the centers of the rotating shafts of the acting arms and the axes of the convex columns are orthogonally intersected with the groove lines of the sliding grooves of the separation blades, or form included angles slight larger than 90 degrees; and the driving motors are mounted on the image sensor support, and are connected with the acting arms for driving the acting arms. The self-locking type shutter device with high impact resistance has the characteristics of self-locking, high impact resistance, high overload resistance and the like in the normally-open state, and capability of realizing non-uniformity correction or exposure control of an image sensor focal plane in the closed state, so that the opening and closing time can be regulated and controlled conveniently according to requirements, the volume is small and the structure is compact.

A closed-type petroleum and petrochemical flare horizontal pipeline deformation compensation system based on a rotary compensator is characterized in that it includes at least one closed rotary compensator installed on the flare horizontal pipeline, and the closed rotary compensator consists of four rotary compensators The compensator (3) is composed of two vertically installed tee pipes (2), the upper connecting pipe (4) and the lower connecting pipe (5). The corresponding ports of the horizontal torch pipe (1) of the same straight line are connected, and the two vertical nozzles of each three-way pipe (2) are respectively connected with a rotary compensator (3), and the upper ends of the two three-way pipes (2) The rotary compensator (3) is connected through the upper connecting pipe (4) to form a pipeline for the circulation of the gaseous medium, and the rotary compensator (3) located at the lower end of the two tee pipes (2) is connected through the lower connecting pipe (5) to form a pipeline for the circulation of the gaseous medium. Pipelines for the flow of liquid media. The invention has the advantages of long compensation distance, small investment, safety and reliability.

The invention belongs to the field of aero-engine external pipeline design, and particularly relates to a pipeline connecting device with multidirectional displacement compensation capability. The pipeline connecting device comprises a first pipeline, wherein one end of the first pipeline is a columnar port, the outer wall is an outer cylindrical surface, and the tail end protrudes to form a flange; a second pipeline, wherein one end of the second pipeline is a spherical port; and a connecting pipe which comprises a first sleeve opening and a second sleeve opening, wherein the first sleeve opening sleeves the first pipeline, an elastic O-shaped ring is arranged between the first sleeve opening and the outer cylindrical surface, the second sleeve opening sleeves the second pipeline, the position, corresponding to the spherical port of the second pipeline, of the second sleeve opening is in a horn shape, and a first connecting piece and the connecting pipe are matched in shape to clamp the elastic O- shaped ring. Through the integrated design of axial compensation and angular compensation, the compensation requirements of the pipeline in all directions can be met while the sealing performance is guaranteed; and the pipeline connecting device has the advantages of a simple structure, small occupied space and strong compensation capability.

The invention discloses a single-phase PAPF circuit modeling method considering coupling relation, which comprises the following steps: obtaining the value of DC side voltage of the single-phase PAPFcircuit; Acquiring a value of the AC side inductance of the single-phase PAPF circuit; Obtaining a value of the DC side capacitance of the single-phase PAPF circuit; Based on the value of the DC-sidevoltage, modeling the value of the AC-side inductance and the value of the DC-side capacitance. By reasonably choosing the parameters of single-phase PAPF circuit, the compensation requirements underall conditions of a particular load can be met, and the form is simple, the calculation is convenient, the versatility is strong, the equipment cost can be reduced, the compensation effect can be improved and the stability of the whole system can be improved. At the same time, aiming at the coupling relationship between the parameters of the main circuit, starting from the actual operating conditions, through the MATLAB three-dimensional modeling and data optimization, a clear parameter selection method is obtained. The simulation and experimental results verify the correctness and feasibilityof the method.