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34 results about "Half-integer" patented technology
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In mathematics, a half-integer is a number of the form n+1/2, where n is an integer. For example, 4½, 7/2, −13/2, 8.5 are all half-integers. Half-integers occur frequently enough in mathematical contexts that a special term for them is convenient. Note that a half of an integer is not always a half-integer: half of an even integer is an integer but not a half-integer. The half-integers are precisely those numbers that are half of an odd integer, and for this reason are also called the half-odd-integers.
Device for measuring fractional-order optical vortex topology charge values and measuring method thereof
Provided are a device for measuring fractional-order optical vortex topology charge values and a measuring method thereof. The measuring method comprises the steps of writing generated calculating holographic images into a spatial light modulator through a computer holographic technique, acquiring wrapped phase images of vortex light beams through Michelson interference light paths and a four-step phase shifting technique, analyzing distribution of real phases theta of the vortex light beams through a phase image unwrapping algorithm, and calculating according to the topology charge definition of m=theta / 2pi to obtain topology charge values m of any fractional-order accuracy. The device and method achieve the measurement of any step (0.1 step) of topology charge values of the fractional-order vortex light beams, can correct measurement of topology charge values of vortex light beams from existing half-integer step (0.5 step) to any step and can be widely applied to measurement of topology charge values in the fields of bose-einstein condensation, quantum communication, information coding and transmission, particle confinement, optical tweezers, optical wrenches and the like.
Owner:HENAN UNIV OF SCI & TECH
Wideband Interferometer Type Polarized Light Combiner and Splitter
A interferometer type polarization beam combiner and splitter, which can combine or split polarized light over a wide band, is provided. The interferometer type polarization beam combiner and splitter includes: an optical splitter; an optical coupler; an optical path length difference imparting unit, which includes a plurality of optical waveguides arranged between the optical splitting unit and the optical coupling unit; one or two input / output ports connected to the optical splitter; and two input / output ports connected to the optical coupler. A half-integer of a wavelength of λc is set as a normalized phase difference, for the optical path length difference imparting unit, between two polarization states, and means for generating a difference in refractive index dispersion is provided between the optical waveguides of the optical path length difference imparting unit, so that the change rate of the transmittance with respect to wavelength is suppressed for the two polarization states.
Owner:NIPPON TELEGRAPH & TELEPHONE CORP
Cancellation of ringing in magnetic resonance utilizing a composite pulse
InactiveUS20050030029A1Eliminating or canceling acoustic ringingCoil ringdown and piezoelectric ringing are also substantially reducedMaterial analysis by using resonanceElectric/magnetic detectionSpinsPulse sequence
A magnetic resonance detection apparatus is provided that is not susceptible to acoustic ringing, and a method is provided for eliminating or canceling acoustic ringing from a detected magnetic resonance signal. Specifically, a composite pulse is utilized that allows for both efficient reduction of acoustic ringing signals and the detection of true NQR signals. The composite pulse can be used in any of the common NQR pulse sequences currently utilized simply via substitution of the original single pulses with the composite pulse. Furthermore, although a preferred application involves the spin-1 nucleus 14N and NQR, the composite pulse will be useful for the NQR of other nuclei such as 35Cl and 39K and in NMR applications and involving half-integer quadrupolar nuclei and spin-½ nuclei. In addition, coil ringdown and piezoelectric ringing are also substantially reduced.
Owner:NAVY USA REPRESENTED BY THE SEC OF THE
Surface inspection method and surface inspection apparatus
ActiveUS7487049B2Reduce impactReducing and eliminating influenceScattering properties measurementsOptically investigating flaws/contaminationLight scatteringPulsed laser
When detecting light scattered by an object to be inspected by using a pulse laser as a light source, noise increases unless a sampling repletion period of an A / D converter is determined so as to be related to a pulse oscillation repetition period of the light source. (1) The sampling repletion period of the A / D converter is set equal to the pulse oscillation repetition period of the light source or an integer times thereof, and the sampling is synchronized with oscillation of the light source. Or (2) the sampling repletion period of the A / D converter is set equal to a half-integer times the pulse oscillation repetition period of the light source. Even if a ripple component resulting from emission pulses of the light source remains in the scattered light signal supplied to the A / D converter remains, therefore, its influence can be eliminated or reduced.
Owner:HITACHI HIGH-TECH CORP
Wideband interferometer type polarization light beam combiner and splitter
ActiveUS8787710B2Coupling light guidesOptical waveguide light guidePhase differenceOptical pathlength
Owner:NIPPON TELEGRAPH & TELEPHONE CORP
Half-integer frequency dividers that support 50% duty cycle signal generation
A fractional-N frequency divider includes a half-integer frequency divider and a duty cycle adjustment circuit. The half-integer frequency divider includes a multi-modulus divider containing a cascaded chain of div2 / 3 cells, which is responsive to a multi-bit modulus control signal, and a phase control circuit configured support half-integer frequency division by the multi-modulus divider, by providing an input terminal of the multi-modulus divider with a periodically phase-flipped input signal having a first frequency. The duty-cycle adjustment circuit is configured to generate a divider output signal with a 50% duty cycle in response to a periodic signal generated by the half-integer frequency divider.
Owner:INTEGRATED DEVICE TECH INC
Surface inspection method and surface inspection apparatus
ActiveUS20080015810A1Reduce impactReducing and eliminating influenceScattering properties measurementsDigital computer detailsBuck converterĆuk converter
When detecting light scattered by an object to be inspected by using a pulse laser as a light source, noise increases unless a sampling repletion period of an A / D converter is determined so as to be related to a pulse oscillation repetition period of the light source. (1) The sampling repletion period of the A / D converter is set equal to the pulse oscillation repetition period of the light source or an integer times thereof, and the sampling is synchronized with oscillation of the light source. Or (2) the sampling repletion period of the A / D converter is set equal to a half-integer times the pulse oscillation repetition period of the light source. Even if a ripple component resulting from emission pulses of the light source remains in the scattered light signal supplied to the A / D converter remains, therefore, its influence can be eliminated or reduced.
Owner:HITACHI HIGH-TECH CORP
Liquid crystal display device
The invention discloses a backlight module, and belongs to the technical field of liquid crystal display. The backlight module comprises LED light sources and an angle selection sheet, wherein the angle selection sheet is located on the light-out side of the LED light sources; the angle selection sheet comprises multiple diaphragms which are arranged in a stacked mode; the thicknesses and the refractive indexes of the diaphragms are designed according to the relationships of the optical path difference and the wavelengths of the light sources, wherein the optical path difference of light at afirst angle is a half-integer multiple of the wavelength of the corresponding light source, and the optical path difference of light at a second angle is an integer multiple of the wavelength of the corresponding light source; in the light emitted by the backlight sources, the light at the first angle is diverged outwards through the angle selection sheet, and the light at the second angle is reflected and then passes through the angle selection sheet again until the light is at the first angle. According to the backlight module, by designing the angle selection sheet, the light emitted by thebacklight sources is transferred into small-angle backlight at the preset angle, and the small-angle backlight can completely enter corresponding quantum dot units, so that the light-out collimationdegree is improved, and crosstalk among pixels of a quantum-dot liquid crystal panel is prevented.
Owner:HISENSE VISUAL TECH CO LTD
Pulse sequences for exciting nuclear quadrupole resonance
InactiveUS20050162163A1Improve accuracyReduce the effect of temperatureElectric/magnetic detectionMaterial analysis by using resonanceSpinsPulse sequence
An apparatus and method for producing a multi-pulse sequence for irradiating a substance provided with quadrupole nuclei with either integer or half-integer spins to detect an NQR signal emitted therefrom. The apparatus has pulse sequence generating means adapted to produce multi-pulse sequences with pulse intervals exceeding T2* and containing a preparatory pulse or group of pulses for creating echo signals between the pulses. The pulse sequence is organised so that the resulting signal contains a prevailing echo component produced by the preparatory pulse or group of pulses.
Owner:RAPISCAN SYST INC (US)
Cancellation of ringing in magnetic resonance utilizing a composite pulse
InactiveUSH2177H1Eliminating or canceling acoustic ringingCoil ringdown and piezoelectric ringing are also substantially reducedMaterial analysis by using resonanceElectric/magnetic detectionProton magnetic resonanceSpins
A magnetic resonance detection apparatus is provided that is not susceptible to acoustic ringing, and a method is provided for eliminating or canceling acoustic ringing from a detected magnetic resonance signal. Specifically, a composite pulse is utilized that allows for both efficient reduction of acoustic ringing signals and the detection of true NQR signals. The composite pulse can be used in any of the common NQR pulse sequences currently utilized simply via substitution of the original single pulses with the composite pulse. Furthermore, although a preferred application involves the spin-1 nucleus .sup.14N and NQR, the composite pulse will be useful for the NQR of other nuclei such as .sup.35CI and .sup.39K and in NMR applications and involving half-integer quadrupolar nuclei and spin- 1 / 2 nuclei. In addition, coil ringdown and piezoelectric ringing are also substantially reduced.
Owner:NAVY USA REPRESENTED BY THE SEC OF THE
Pulse sequences for exciting nuclear quadrupole resonance
InactiveUS7355400B2Electric/magnetic detectionMaterial analysis by using resonanceFrequency spectrumSpins
An apparatus and a method for producing a multi-pulse sequence for irradiating a substance provided with quadrupole nuclei with either integer or half-integer spins to detect an NQR signal emitted therefrom. The apparatus has pulse sequence generating means adapted to produce a combination of two or more pulse sequences, arranged so that a definite regularity of the phase alteration of pulses in each of the pulse sequences occurs that is equivalent to a shift of spectral components of the pulse sequences in relation to each other. Furthermore, in at least one of the pulse sequences, there are not less than two phases alternating. A preparatory pulse may be included in one of the pulse sequences to reduce the effect of temperature, increase the intensity of the NQR signal and simultaneously eliminate intensity anomalies. Alternatively, the combination of pulse sequences may be different from a combination of PAPS and NPAPS, and none of the pulse sequences contain a preparatory pulse.
Owner:RAPISCAN SYST INC (US)
Motion image coding method and motionííimage coder
InactiveCN1549601ATelevision system detailsPulse modulation television signal transmissionDecoding methodsMotion vector
In order to prevent accumulation of rounding errors caused by the integer-based bilinear interpolation used in the motion compensation process of image coding and decoding methods, two types of P frames are used for unidirectional motion compensation prediction, namely: P+ frames, which round the results of bilinear interpolation with real number operations to the nearest integer and rounds half integer values (0.5 added to an integer) away from zero, and P- frames, which differs from P+ frames in that the above mentioned half integer values are rounded towards zero. Utilising both of these P+ and P- frames enables cancelling of rounding errors and prevents the accumulation of rounding errors.
Owner:HITACHI LTD
Method for detecting and correcting clock error lock of CPM signal greater than 1 modulation index
The invention discloses a method for detecting and correcting a clock error lock of a CPM signal greater than 1 modulation index. When the modulation index of the CPM signal is a half integer greaterthan 1, a signal has a plurality of positive slope zero-crossing points in half of code element time through an S curve of the delay locking ring; mistaken locking of the delay locking ring is caused.An error detection decision device is introduced to detect whether the tracking ring is locked mistakenly. When error lock occurs, the output of an error accumulator in the error detection decision device can exceed a set threshold. A judgment is made that the delay locked loop has error locking. The delay to a correct locking interval is pushed through an error detector and the value of an erroraccumulator is reset to be 0 under the condition of setting an appropriate threshold value, an appropriate weighting coefficient and an appropriate propelling interval, and the tracking loop enters acorrect tracking process. Through verification on a Matlab platform, under the condition of different modulation indexes, the error detection decision device can correctly judge the false lock and enable the delay locking ring to enter a correct locking interval again.
Owner:NANJING UNIV OF AERONAUTICS & ASTRONAUTICS
Motion image coding method and motion image coder and recording medium
In order to prevent accumulation of rounding errors caused by the integer-based bilinear interpolation used in the motion compensation process of image coding and decoding methods, two types of P frames are used for unidirectional motion compensation prediction, namely: P+ frames, which round the results of bilinear interpolation with real number operations to the nearest integer and rounds half integer values (0.5 added to an integer) away from zero, and P- frames, which differs from P+ frames in that the above mentioned half integer values are rounded towards zero. Utilising both of these P+ and P- frames enables cancelling of rounding errors and prevents the accumulation of rounding errors.
Owner:HITACHI LTD
Rotary Electric Machine
InactiveUS20190131840A1Efficient executionMagnetic circuit rotating partsMagnetic circuit stationary partsBrushless motorsElectric machine
An object of the invention is to provide a concentrated winding brushless motor of a permanent magnet type, in which a lead wire and a jumper wire to a tooth far away from the adjacent tooth are disposed at the ends of coils on an axially reverse side in order to make a manufacturing work of coils efficient. In order to achieve the object, there is provided a brushless motor which is provided with a concentrated winding stator and a permanent magnet type rotor, a stator coil is wound to satisfy that the number of times of winding of coils of a tooth connected to the lead wire is set to a half integer or, in a case where there is a coil which is connected to the coil of the tooth connected to the lead wire, the number of times of winding of the teeth is set to a half integer, the number of times of winding of the coil of the tooth connected to the lead wire or a coil of a tooth far away from the adjacent tooth which are connected by the jumper wire, or the number of times of winding of the coil of the tooth adjacently connected to the coil of the tooth far away from the adjacent tooth which are connected by the jumper wire is set to an integer.
Owner:HITACHI AUTOMATIVE SYST ENG
System and method for clock generation with an output fractional frequency divider
ActiveUS9698800B2Pulse automatic controlCounting chain synchronous pulse countersEngineeringClock signal
Owner:ANALOG DEVICES INT UNLTD
Integer and half-integer frequency divider based on characteristic state feedback
ActiveCN108880532APrecision Adjusted Duty CycleAdjust duty cycleCounting chain pulse countersFeedback controllerEngineering
The invention belongs to the technical field of frequency dividers of integrated circuits, and particularly provides an integer and half-integer frequency divider based on characteristic state feedback. The frequency divider comprises a clock phase inverter, an N-bit binary counter, an output clock selector and a feedback controller; and the feedback controller comprises a level type characteristic state decoder, a triggering type characteristic state decoder, a level type inverter and a triggering type inverter. According to the frequency divider, by feeding back characteristic states determined by a frequency division coefficient and conducting phase processing on an input clock, the binary counter is triggered at the edge designated by a to-be-divided clock, and the counting bit corresponding to the frequency division coefficient is selected and output to serve as a frequency division clock; and only an interface signal of the binary counter needs to be processed, the internal structure of the binary counter does not need to be changed, the advantages of being simple in design and high in universality are achieved, and not only can complete integer and semi-integer frequency division be achieved, but also the duty ratio of the frequency division clock can be adjusted by taking a 0.5 input clock cycle as the precision.
Owner:FUDAN UNIV
Enhancing critical current density of cuprate superconductors
The present invention concerns the enhancement of critical current densities in cuprate superconductors. Such enhancement of critical current densities include using wave function symmetry and restricting movement of Abrikosov (A) vortices, Josephson (J) vortices, or Abrikosov-Josephson (A-J) vortices by using the half integer vortices associated with d-wave symmetry present in the grain boundary.
Owner:SOLAR TECTIC
X-ray source scanning parameter adjustment method and device, computer equipment and readable storage medium
PendingCN110215225AReduce thermal deformationExtend your lifeRadiation diagnostic device controlComputerised tomographsX-rayThermal deformation
The invention provides an X-ray source scanning parameter adjustment method. The method comprises the steps that X-ray source scanning parameters are obtained, wherein the X-ray source scanning parameters comprise a rotation period of a target disk and an energy period of an X-ray source; the ratio of the rotation period to the energy period is determined; if the ratio does not satisfy a preset condition, the X-ray source scanning parameters are adjusted, so that the ratio satisfies the preset condition; the preset condition is a first preset condition or a second preset condition, wherein thefirst preset condition is that the ratio of the rotation period to the energy period is not equal to an integer, and the second preset condition is that the ratio of the rotation period to the energyperiod is equal to a half integer. The provided X-ray source scanning parameter adjustment method has the advantages that by adjusting the rotation period of an anode target disk and the energy cycleof the X-ray source, the rotation period of the anode target disk is not an integral multiple of the energy period of the X-ray source, thereby avoiding the occurrence of an 'anode target disk energybeat frequency phenomenon', reducing the thermal deformation of the anode target disk, and prolonging the service life of the anode target disk.
Owner:SHANGHAI UNITED IMAGING HEALTHCARE
A method for non-destructive size measurement of subsurface targets combining frequency encoding and half-integer phase control
ActiveCN121346710BWave based measurement systemsUsing subsonic/sonic/ultrasonic vibration meansEcho signalMesh grid
The application provides a non-destructive size measurement method for underground targets by combining frequency coding and half-integer phase control, and belongs to the field of non-destructive size measurement of underground targets. The method solves the problem that the prior art cannot effectively overcome the near distance blind area and suppress the frequency domain sidelobe. The method comprises the following steps: constructing an equal-interval frequency grid; generating a transmission frequency sequence by using a step parameter coprime with the total frequency point number for coding sorting; defining the effective transmission duration of each frequency point time slot, so that the near distance blind area range is determined by meeting the half-integer period condition; in each frequency point time slot, a linear sweep signal is generated, and the cumulative phase of the signal at the end of the time slot is controlled to meet the half-integer circle constraint; the signal is transmitted in sequence, and the echo signal is received synchronously; the complex frequency response of each frequency point is extracted, and after frequency domain coherent synthesis, the phase information is differentially approximated to obtain the group time delay; and the target geometric size is calculated according to the medium propagation speed and the group time delay. The method is used in the field of pipe network detection.
Owner:HARBIN INST OF TECH
An Active Sensor Based on Half Integer Order Resonance Mode
ActiveCN111122610BHigh quality factorImprove detection accuracyMaterial analysis using microwave meansDielectric plateAmplifier
Owner:SHANGHAI UNIV
Motion image coding method and motion image coder
In order to prevent accumulation of rounding errors caused by the integer-based bilinear interpolation used in the motion compensation process of image coding and decoding methods, two types of P frames are used for unidirectional motion compensation prediction, namely: P+ frames, which round the results of bilinear interpolation with real number operations to the nearest integer and rounds half integer values (0.5 added to an integer) away from zero, and P- frames, which differs from P+ frames in that the above mentioned half integer values are rounded towards zero. Utilising both of these P+ and P- frames enables cancelling of rounding errors and prevents the accumulation of rounding errors.
Owner:HITACHI LTD
Enhancing critical current density of cuprate superconductors
InactiveUS20120142536A1Conductive materialSuperconductor detailsCuprate superconductorSuperconductor classification
The present invention concerns the enhancement of critical current densities in cuprate superconductors. Such enhancement of critical current densities include using wave function symmetry and restricting movement of Abrikosov (A) vortices, Josephson (J) vortices, or Abrikosov-Josephson (A-J) vortices by using the half integer vortices associated with d-wave symmetry present in the grain boundary.
Owner:SOLAR TECTIC
Spread spectrum CPM signal capturing method with modulation index h being more than 1 and being half integer
In the capturing process of a CPM signal with a modulation index h being more than 1 and being a half integer, due to the fact that a correlation function of the CPM signal has the multi-peak characteristic, the problem of false capturing can happen, and the spread spectrum CPM signal is captured by applying a Bump Jump algorithm to correlation function peak detection of the spread spectrum CPM signal with the modulation index larger than 1. A secondary peak detection method of the spread spectrum CPM signal based on collision jump is provided aiming at the influence of the low signal-to-noise ratio on zero point dislocation of main detection and auxiliary detection functions, when a receiver detects a secondary peak, judgment and processing are carried out, an estimated code phase jumps towards the direction of a main peak, and finally the position of the main peak is determined. Verification is carried out on a Matlab platform, a detection algorithm based on collision jump is suitable for capture of spread spectrum CPM signals, the detection performance of the algorithm is improved by about 4 dB compared with that of a Bump Jump algorithm under the condition of a low signal-to-noise ratio, and capture of the spread spectrum CPM signals under the condition of the low signal-to-noise ratio can be more effectively achieved.
Owner:NANJING UNIV OF AERONAUTICS & ASTRONAUTICS
Digital portable terminal and digital signal processing equipment
InactiveCN1549459ATelevision system detailsPulse modulation television signal transmissionDigital signal processingDecoding methods
In order to prevent accumulation of rounding errors caused by the integer-based bilinear interpolation used in the motion compensation process of image coding and decoding methods, two types of P frames are used for unidirectional motion compensation prediction, namely: P+ frames, which round the results of bilinear interpolation with real number operations to the nearest integer and rounds half integer values (0.5 added to an integer) away from zero, and P- frames, which differs from P+ frames in that the above mentioned half integer values are rounded towards zero. Utilising both of these P+ and P- frames enables cancelling of rounding errors and prevents the accumulation of rounding errors.
Owner:HITACHI LTD
System and method for clock generation with an output fractional frequency divider
Owner:ANALOG DEVICES INT UNLTD
An Integer and Half Integer Frequency Divider Based on Eigenstate Feedback
ActiveCN108880532BAdjust duty cycleSimple designCounting chain pulse countersFeedback controllerInverter
Owner:FUDAN UNIV
Sport image coding method and decoding apparatus
InactiveCN1156167CTelevision system detailsPulse modulation television signal transmissionDecoding methodsErrors and residuals
In order to prevent accumulation of rounding errors caused by the integer-based bilinear interpolation used in the motion compensation process of image coding and decoding methods, two types of P frames are used for unidirectional motion compensation prediction, namely: P+ frames, which round the results of bilinear interpolation with real number operations to the nearest integer and rounds half integer values (0.5 added to an integer) away from zero, and P- frames, which differs from P+ frames in that the above mentioned half integer values are rounded towards zero. Utilising both of these P+ and P- frames enables cancelling of rounding errors and prevents the accumulation of rounding errors.
Owner:HITACHI LTD
Separated-orbit bisected energy-recovered linear accelerator
ActiveUS9125287B2Improving control and performance and operabilityLinear acceleratorsPath lengthEnergy recovery linac
A separated-orbit bisected energy-recovered linear accelerator apparatus and method. The accelerator includes a first linac, a second linac, and a plurality of arcs of differing path lengths, including a plurality of up arcs, a plurality of downgoing arcs, and a full energy arc providing a path independent of the up arcs and downgoing arcs. The up arcs have a path length that is substantially a multiple of the RF wavelength and the full energy arc includes a path length that is substantially an odd half-integer multiple of the RF wavelength. Operation of the accelerator includes accelerating the beam utilizing the linacs and up arcs until the beam is at full energy, at full energy executing a full recirculation to the second linac using a path length that is substantially an odd half-integer of the RF wavelength, and then decelerating the beam using the linacs and downgoing arcs.
Owner:JEFFERSON SCI ASSOCS LLC
FFT inter frequency loss mitigation and GPS receiver including it
Acquisition method for a localization receiver, in particular for a GPS receiver. It involves the calculation of an interpolated FFT spectrum (S′) of correlated signals in which the frequency lines corresponding to half-integer values of the frequency resolution defined by the FFT are obtained by a combination of both amplitude and phase values of the FFT spectrum (S).
Owner:QUALCOMM INC