161 results about "Phase domain" patented technology

An atrial fibrillation classification system collects celectrocardiogram signals and converts them to a frequency, time, or phase domain representation for analysis. An evaluation stage extracts energy density profile over a range of frequencies, time intervals, or phases, which is then summed and normalized to form dispersion metrics. The system then analyzes the dispersion metrics, in their respective domains, to determine whether a patient is experiencing an arrhythmia and then to classify the type of arrhythmia being experienced.

The invention discloses a GFSK baseband digital receiver and a baseband synchronization and demodulation method of the GFSK baseband digital receiver. The receiver comprises a phase difference detection module, a frequency shift estimation module, a frequency shift compensation module, a matched filtering module, a direct current component estimation and removing module, a selector and a synchronization and demodulation module. According to the receiver and the method, DFT operation of a specific frequency point is carried out on code element envelope signals output through phase difference detection; whether there are leader sequence signals or not is judged; moreover a corresponding frequency shift is calculated; frequency compensation and matched filtering are carried out on follow-up baseband signals; code element envelope is output through difference detection; and at this time, the direct current component estimation and removing module and the synchronization and demodulation module of the backward stage start working. The receiver is equipped with a frequency shift estimation and compensation circuit, thus improving the performance of the receiver; signal demodulation and code element judgment are carried out in a phase domain; the symbol synchronization and sampling clock synchronization of the receiver are realized based on a counter; and the receiver is simple and reliable in structure and can adapt to various different data rates.

A method for the synthesis of well-defined rod-coil block copolymers consisting of P3HT donor and C60 acceptor chromophores (P3HT-b-P(SxAy)-C60) in a molecular architecture is reported for use in bulk-heterojunction (BHJ) solar cells. In thin films of the resulting block copolymer, reproducible self-assembly into well-defined “nanofibrils” is observed. This is the first example of a block copolymer containing a C60 derivative that shows exclusively a nanofibrilar structure. A substantial improvement in device performance is achieved when the block copolymer is used as a “surfactant” for controlling the interface morphology of the P3HT:PCBM donor-acceptor phase domains within the composite.

A shaped, activated metal, fixed-bed catalyst with a pore volume of 0.05 to 1 ml / g and an outer activated layer consisting of a sintered, finely-divided, catalyst alloy and optionally promoters. The catalyst alloy has metallurgical phase domains, resulting from the method of preparation of the alloy, in which the largest phase by volume has a specific interface density of more than 0.5 mum-1.

The invention discloses a harmonic matrix transfer function-based system stability analysis method for a grid-connected inverter. According to the invention, a nonlinear trigonometric function is transformed into a linear matrix through Toeplitz transformation, so that a mature linear control block diagram simplification theory can be applied during the phase domain impedance derivation process. The model derivation process is greatly simplified. The method is suitable for the phase-domain impedance modeling of a three-phase grid-connected inverter. Even when a system control method is adjusted, for example, a feedforward compensation controller is added, a system impedance model can still be quickly calculated. Therefore, the stability analysis can be carried out on the system.

The invention relates to a modal parameter identification method based on response signal time-frequency joint distribution characteristics. According to the modal parameter identification method based on the response signal time-frequency joint distribution characteristics, signal analysis and structural modal parameter identification are carried out directly through a structural vibration response. The modal parameter identification method based on the response signal time-frequency joint distribution characteristics comprises the steps of firstly carrying out complex wavelet continuous transformation on a structural response signal, obtaining energy distribution characteristics of various wavelet transformation domains (a real domain, a virtual domain, a modal domain and a phase domain), obtaining a time average wavelet energy spectrum through a wavelet transformation coefficient, therefore carrying out quantification on selection of model orders and the scale corresponding to each order modality, on the basis, obtaining the optimum scale required by parameter identification, achieving pre-identification of modal frequency through the corresponding relation of the scale and the frequency, finally extracting a wavelet transformation coefficient slice at the specific scale, carrying out linear fitting through an amplitude value and a phase component, and achieving structural identification of inherent frequency and a damping ratio. As simulation and experiment results show, even if an external incentive function is not included, accurate identification of structural modal parameters can be achieved through the modal parameter identification method based on the response signal time-frequency joint distribution characteristics.

The invention relates to a flame retardant fiber and a preparation method thereof. The preparation method comprises the following steps: mixing cellulose or polyacrylonitrile and a flame retardant high polymer according to a ratio, dissolving at high temperature to prepare a high concentration spinning solution, filtering, cooling, pressurizing for extruding, uniformly mixing two components in the spinning solution through a shearing effect generated by pressure, and performing multiple stretching, thereby forming the blended fiber of polyacrylonitrile or cellulose with the phase domain size of less than 50nm. The flame retardant fiber, namely the blended fiber, is prepared by directly spinning, the problem of mixing uniformity is solved, and the flame retardant fiber has the excellent characteristics of good flame retardant performance, high flame retardant durability, zero halogen and phosphorus, low toxicity, comfort and the like and has significance for developing flame retardant fibers which are not toxic, less in smoke and environmentally friendly.

An absorbent article containing a nonwoven web that includes a plurality of polyolefin fibers is provided. The polyolefin fibers are formed by a thermoplastic composition containing a continuous phase that includes a polyolefin matrix polymer and nanoinclusion additive is provided. The nanoinclusion additive is dispersed within the continuous phase as discrete nano-scale phase domains. When drawn, the nano-scale phase domains are able to interact with the matrix in a unique manner to create a network of nanopores.

A method for converting source data to a channel-modulated signal having pairs of in-phase (I) and quadrature-phase (Q) data in a mobile station, wherein the mobile station includes: encoding the source data to generate at least one data part and a control pant; generating a spreading code to allocate to a channel, wherein each spreading code is selected on the basis of a data rate of the data part and the control part and spreading codes are selected so two consecutive pairs of I and Q data correspond to two points located on same point or symmetrical with respect to a zero point on a phase domain; and spreading the control part and the data part with the spreading code, to generate the channel-modulated signal. The method is capable of improving a power efficiency of a mobile station of a mobile communication system by reducing a peak-to-average power ratio.

Nanocomposites of multi-phase metal oxide ceramics have been produced from water soluble salts of the resulting metal oxides by a foaming esterification sol-gel method. The evolution of volatile gases at elevated temperature during the esterification reaction causes the formation of a foam product. Nanocomposites of multi-phase metal oxide ceramics have also been produced by a cation polymer precursor method. In this second method, the metal cations are chelated by the polymer and the resulting product is gelled and foamed. Calcination of the resulting foams gives nanocomposite powders with extremely fine, uniform grains and phase domains. These microstructures are remarkably stable both under post-calcination heat treatment and during consolidation by hot-pressing.

A compressible coating layer comprising a film forming resin and a thermoplastic additive is disclosed. The film forming resin comprises polyurea and / or polyurethane and the thermoplastic additive comprises a micronized amide wax. The thermoplastic additive is dispersed throughout the coating and maintains separate phase domains upon cure. Methods for coating substrates using these compressible coating layers and substrates coated thereby are also disclosed.

An apparatus includes a first substrate; and a second substrate coupled to the first substrate, characterized in that, to control formation of a segregated phase domain structure within a chemical reaction product by controlling an amount of a constituent of a precursor that is present per unit surface area, at least one member selected from the group consisting of the first substrate and the second substrate defines a substantially regularly periodically varying relief with respect to basal spatial location.

The present invention relates to a novel particulate porous carbon material containing a carbon phase and at least one pore phase, and to the use of such materials in lithium cells, especially lithium-sulfur cells. The carbon phase forms, with the pore phase, essentially unordered co-continuous phase domains, such that the distance between adjacent domains of the pore phase is not more than 50 nm. The invention also relates to a process for producing such carbon materials and to composite materials comprising elemental sulfur and at least one inventive particulate porous carbon material.

A quantization circuit includes a quantizer and a compensation circuit. The quantizer includes a voltage-to-phase converter and a phase difference digitization block. The voltage-to-phase converter is arranged for generating a phase signal according to an input voltage. The phase difference digitization block is arranged for generating a quantization output according to a phase difference between a phase of the phase signal and a reference phase input. The compensation circuit is arranged for applying compensation to the phase difference digitization block according to the quantization output.

The invention relates to a preparation method of a nylon-6-based polyesteramide fiber. The method comprises the steps of carrying out melt spinning on a nylon-6-based polyesteramide polymer to obtainthe nylon-6-based polyesteramide fiber. A preparation method of the nylon-6-based polyesteramide polymer comprises the steps of mixing nylon-6 prepolymer ester with a polyester prepolymer and then carrying out an ester exchange reaction to obtain the nylon-6-based polyesteramide polymer. The nylon-6 prepolymer ester is prepared by firstly synthesizing a dibasic-acid-terminated nylon-6 prepolymer and then adding dihydric alcohol to enable dihydric alcohol to react with carboxyl of terminal groups. According to the preparation method of the nylon-6-based polyesteramide fiber, the nylon-6-based polyesteramide polymer is obtained through a copolymerization approach, so that the uniformity of nylon-6 and polyester blocks is improved, and the phase domain is controllable; polyesteramide slices containing polyester chain segments at different ratios can be obtained by changing the addition quantity of the polyester prepolymer, so that the sequence structure is controllable, and the polymerization process is flexible. The prepared fiber has high spinnability and stiffness and can be applied to the fields of clothing, home textiles, automobile interior decoration and the like.

The invention discloses a multi-target learning far field speech recognition method based on amplitude and phase information, which comprises the following steps of: S1, preparing input data; S2, extracting an amplitude characteristic and various phase characteristics; and S3, constructing a multi-task deep neural network, inputting the extracted amplitude characteristic and phase characteristicsinto the neural network to train, and outputting an enhanced speech and the enhanced characteristics. The enhanced speech is utilized to carry out SRMR evaluation, and the enhanced characteristics areutilized to carry out speech recognition. The method utilizing multi-target learning, which is disclosed by the invention, simultaneously enhances the speech and the characteristics, and compared toan existing method, in consideration of a bad effect of characteristics of a group delay system (MGDCC) under a reverberation speech, adds another phase characteristic, i.e., channel information (PBSFVT) of a source separation method based on a phase domain, to make up the defect of the MGDCC, so as to improve speech recognition accuracy.

The invention discloses a real-time quasi-static ultrasonic elastography method. The real-time quasi-static ultrasonic elastography method includes: firstly, acquiring a multiframe ultrasonic radiofrequency signal; secondly, building a complex cross-correlation function; thirdly, determining a displacement field distribution plan and a strain distribution plan of the ultrasonic radiofrequency signal; and fourthly, generating a biological tissue strain distribution plan in real time. A complex model of the signal is built on the basis of phase domain information of the ultrasonic signal by the ultrasonic elastography method. The complex cross-correlation function of the signal is calculated to obtain a phase difference so as to calculate a displacement distribution value. The calculation of the real-time quasi-static ultrasonic elastography method compared with the existing imaging methods based on time-domain cross correlation is reduced evidently, calculating efficiency is improved greatly, and the real-time quasi-static ultrasonic elastography method is applicable to real-time imaging systems. In addition, by taking the advantage of the distribution continuality feature of biological tissue field and introducing prior time predicted values, the problem of phase difference disorder is solved.

Provided is an approach for active control of cross currents flowing among multiple paralleled converters. Control of cross currents is achieved by using at least one proportional-integral (PI) controller and at least one resonant controller to target several selected dominant harmonics with infinite gains to ensure elimination of targeted harmonic cross currents in steady state. The cross currents are decomposed by into (1) common mode and differential mode components or (2) current phase domain components and each component is suppressed to a value approximately near zero using the controller. Also provided is a device comprises instructions, that, when executed by a processor, cause the processor to perform operations, which regulate and suppress cross current within a power system.

The invention relates to a block copolymer. The block copolymer is a type-AB diblock copolymer or a type-ABA or type-BAB triblock copolymer. The block copolymer A is polycarbonate formed by alternating copolymerization of carbon dioxide and alkyleneoxide. The number-average molecular weight of the polycarbonate ranges from 500 to 300000, the unit content of the polycarbonate is 30-100%, the content of polyether generated by homopolymerization of the alkyleneoxide is 0-70%, and the molecular weight ranges from 1.00 to 2.00; the number-average molecular weight of the block copolymer B ranges from 500 to 300000, and the molecular weight is distributed between 1.00 to 2.00. The invention further relates to a method for forming a microphase separation perpendicular phase domain structure and application of the block copolymer under the directed self-assembly technology. The block copolymer forms a perpendicular phase domain structure penetrating through the whole film thickness on the thermal annealing condition, regularly-arranged nano-patterns are formed through directed assembling, and the technical requirement that the half section of the next generation in the semiconductor industry is smaller than 11 nanometers is met.

A method and system for determining a position of a rail-bound vehicle on a railway is disclosed. The apparatus comprises: a transmitter and receiver for wireless communication with at least one base station arranged at a predetermined position in the vicinity of the railway; a measurement device to determine a distance to said at least one base station based on measurements of the radio signals of said wireless communication in the time domain and / or phase domain; and a controller arranged to determine a present position of said vehicle on said railway based on said distance. A control system / method for controlling rail-bound vehicles in a railway system, and / or an internal or external system related to such rail-bound vehicles, using such position determination is also disclosed.

A power supply apparatus and method are provided. A conversion component outputs a first current having a predetermined phase region, an output component outputs a load voltage, a sense component senses a second current value, and a switch element allows current to flow in a first state and impedes current in a second state. The switch element changes between states based on a drive signal forcing the switch into the second state when the first current is in the predetermined phase region and the second current value exceeds a threshold indicating an overcurrent condition. A region determination circuit determines whether the first current is in the predetermined phase region and produces a phase region signal. An overcurrent detection circuit senses the second current value, determines whether it exceeds an overcurrent condition threshold, and produces an overcurrent signal. A protection circuit causes the drive circuit to switch the drive signal.