184 results about "Energy leakage" patented technology

The invention relates to a high / low voltage switching excitation system of an electromagnetic flowmeter with a bypass and an energy feedback circuit. The excitation system comprises an adjustable low voltage source circuit, a high / low voltage switching circuit, a constant-current circuit, a bypass circuit, an H-bridge excitation circuit, an excitation control circuit, a logic switching circuit, apower supply detection circuit, the energy feedback circuit and an energy leakage circuit. A practical excitation current detected on a current detecting resistor is compared with an excitation current threshold set in the logic switching circuit, thereby obtaining a control logic which is used for controlling the high / low voltage switching circuit and the bypass circuit, so as to select an excitation work voltage; introduction of the bypass circuit accelerates the response velocity of the excitation current in a coil obviously; the energy feedback circuit stores the energy fed back from an excitation coil; the power supply detection circuit, the energy leakage circuit and a switching protection circuit perform electrification, outage and error protection on the excitation system. The excitation system related to the invention improves the utilization rate of power supply, accelerates the response speed of excitation current, broadens the range of excitation frequency and provides circuit fault protection.

A time-of-arrival (TOA) estimation method for multi-band orthogonal frequency division multiplexing (MB-OFDM) signals uses a simple equally-spaced channel model to recover the impulse response of the wireless channel, and locates the delay of the first channel path by minimizing the energy leakage from the first channel path. The TOA is estimated based on the delay. Such a method does not require channel information for TOA estimation at the receiver and does not require modification of the receiver structure. The method also avoids a sub-optimal solution known to occur in maximum likelihood (ML) estimation.

The invention discloses a high-precision near-field acoustic holography algorithm adopting a weighted iteration equivalent source method, which is characterized in that a holographic plane H is arranged in a sound source near-field radiation area, and sound pressure PH on the holographic plane H is measured; an equivalent source plane Se is arranged at the side, which is away from the holographic plane H, of an object reconstruction plane T, and equivalent sources are arranged on the equivalent source plane Se; a relation between the sound pressure PH and each equivalent source is established by using a sound pressure transfer matrix between the equivalent source and the holographic plane H; and the source intensity Q of each equivalent source is solved by adopting a new iterative regularization algorithm with a posteriori weighted norm constraint penalty term, and then sound field data on the object reconstruction plane T is calculated by using the solved source intensity Q and the transfer matrix between the equivalent source and the object reconstruction plane T. According to the invention, the source intensity of each equivalent source is precisely solved by using the new iterative regularization algorithm with the posteriori weighted norm constraint penalty term, thereby avoiding source intensity energy leakage caused by a 2-norm penalty term in the Tikhonov regularization process. Compared with conventional equivalent source based near-field acoustic holography, a calculation result acquired by the method disclosed by the invention is more accurate.

An electric connector includes two couplers attached to two end portions of a housing, a center contact member disposed in the housing and the couplers, one or more insulators disposed in the housing for insulating and spacing the center contact member from the housing and the couplers and for preventing the center contact member from electrically contacting with the housing and the couplers, and a lightening discharger disposed in the housing and coupled to the center contact member, and the center contact member includes at least two contact segments having different diameter for increasing the impedance matching and for reducing the signal loss or energy leakage or gain loss.

The invention discloses channel estimation method and device, which are used for reducing time slot CIR (Channel Impulse Response) energy leakage, enhancing the accuracy of time slot treatment and improving channel estimation property, and are easy to realize. The channel estimation method comprises the steps of: carrying out frequency-domain sideband expansion on a least square (LS) estimation value of channel frequency response, windowing a middle expanded frequency-domain sideband by the channel frequency response subjected to the frequency-domain sideband expansion, then carrying out time-domain denoising and filtering treatment, and removing the expanded frequency-domain sideband for the channel frequency response hnCOMB subjected to time domain denoising to obtain an estimation value of the channel frequency response.

The invention relates to a narrow-band interference suppression method and a narrow-band interference suppression device. The device comprises an adaptive filter module, a fast Fourier transformation module, a narrow-band interference suppression module and a fast inverse Fourier transformation module. The method comprises the following steps of: 1) forecasting a dispersion sequence obtained through sampling to obtain a narrow-band interference forecast signal according to an adaptive algorithm; 2) multiplying the narrow-band interference forecast signal by a factor K to obtain a forecast factor signal, and subtracting the forecast factor signal from a received signal to obtain a first signal; 3) transforming the first signal to a frequency domain, and performing frequency domain wave trapping processing on the first signal in the frequency domain; and 4) converting the first signal subjected to frequency domain wave trapping into a second signal in a time domain, and inputting the second signal into a spread spectrum signal demodulator to finish narrow-band interference suppression. By the method, the shortcoming that a time domain adaptive filter cannot completely suppress the interference is overcome; and energy leakage in a frequency domain wave trapper is reduced.

Faraday rotator or isolator with mode stripping ferrules and collimators having fiber pigtailed mode stripping components. An example is a compact Faraday Isolator module employing mode stripping ferrules and mode stripping collimators at the input and / or at the output of a fiber pigtailed Faraday Isolator. Two basic isolator types are a Polarization Independent Faraday isolator and a Polarization Maintaining Faraday isolator. The device is substantially immune to damage due to back-reflection, thermal lensing, energy leakage and absorption. Mode stripped optical energy propagating in the reverse direction is diverted onto a heat absorbing and heat sinking structure, as for example at the input of a compact birefringent wedge-based PI isolator. Alternatively, the optical energy propagating in the reverse direction is angularly refracted away from the forward incident beam path and is coupled into the energy dispersive cladding of the input fiber or the ferrule itself.

The invention discloses a radar weak target detecting method based on an information geometry multiple autoregressive model. According to the method, mean value estimation of N covariance matrixes is achieved based on the definition of the Karcher mean value and the geodesic line, the clutter environment around a covariance matrix unit to be detected is iterate-estimated by means of the gradient descent algorithm, the multiple autoregressive model is introduced, a parallel iterative algorithm is defined with a covariance matrix block structure to calculate Siegel measurement, the distinguishable distance between the covariance matrix unit to be detected and the clutter environment around is estimated, the detection threshold is estimated with the Monte-Carlo method, and weak target signals are distinguished from clutters. According to the method, Fourier transform is replaced with the information geometry method, and the problem of Doppler frequency resolution reduction is avoided; meanwhile, windowing does not needed to be conducted on data series, resolution limitation, energy leakage and pollution to a whole filter bank by the clutter spectrum are avoided, and correct and efficient detection of a radar weak target is achieved.

The invention relates to a rotary motive seal type microwave leakage prevention device which comprises a microwave source cavity (1) and a material conveying roller (6), wherein the microwave source cavity (1) is installed on a rack; the rotatable material conveying roller (6) transversely passes through the middle of the microwave source cavity; the material conveying roller (6) is in matched installation with the microwave source cavity (1) by a sleeve (7) which is sheathed on the external surface of the material conveying roller (6); an annular reactive energy leakage suppressor and an annular resistive energy leakage suppressor are subsequently sheathed from inside to outside; one side of the annular reactive energy leakage suppressor is connected with a side plate at the external end of the microwave source cavity; a wave absorption filler ring (4) is installed in the annular reactive energy leakage suppressor and is pressed by a junk ring (8); the annular reactive energy leakage suppressor is connected with the junk ring; a wave absorption seal ring (5) is installed in the junk ring (8); the annular reactive energy leakage suppressor, the annular resistive energy leakage suppressor and the junk rings form a microwave leakage prevention structure. According to the device provided by the invention, the microwave seal of rotary microwave drying equipment can be realized, and the microwave leakage quantity can be effectively controlled.

The present invention is an aluminum profile extrusion machine real-time energy consumption monitoring and energy consumption abnormality detection system which comprises a smart electric meter, a smart gas meter, a serial port server, a switch and a monitoring server. The smart electric meter and the smart gas meter are connected to the serial port server through an RS-485 bus. The serial port server converts an RS-485 serial port into a TCP / IP network interface, and the data two-way transparent transmission from the RS-485 serial port to the TCP / IP network interface is realized. The monitoring server monitors load energy consumption data in real time and records the energy consumption data of different loads, historical energy consumption data is used to calculate the normal detection interval to unit aluminum profile energy consumption with a regression type support vector machine method, and the energy saving estimation of extrusion production can be carried out according to the comparison of predicted energy consumption data and actual recorded energy consumption data. According to the technical scheme, the energy consumption data of an extrusion set in a workshop can be collected in real time, and through analyzing the historical energy consumption data, the energy consumption abnormal phenomena such as energy leakage, overlong standby time and an inappropriate extrusion parameter in production can be detected.

The invention discloses a cryptographic-equipment-oriented energy leakage acquisition method and system, belonging to the technical field of information security. The method disclosed by the invention comprises the following steps that: (1) a sampling client-side resolves inputted command information to generate a sampling command sequence and sends the sampling command sequence to a sampling server; (2) the sampling server resolves the sampling command sequence to generate control information and sends the control information to an oscillograph or a cryptographic chip; (3) the cryptographic chip executes the received control information and generates a trigger signal, then, sends the executed result to the sampling server, and sends the trigger signal to the oscillograph; (4) the oscillograph executes the received control information, and carries out energy trace information acquisition on the cryptographic chip according to the trigger signal; and (5) the oscillograph sends acquired energy traces to the sampling client-side through the sampling server. The system disclosed by the invention comprises target equipment, the sampling client-side, the sampling server and the oscillograph. The cryptographic-equipment-oriented energy leakage acquisition method and the cryptographic-equipment-oriented energy leakage acquisition system contribute to the fast, accurate and effective evaluation of the energy analysis attack resistance of a cryptographic algorithm in the physics realization of embedded microprocessing.

The invention discloses a side channel signal feature extraction method based on EMD and singular value difference spectrum. The method comprises the following steps: S1) collecting side channel signals and carrying out EMD processing on the side channel signals to obtain a finite number of intrinsic mode function (IMF) components, observing features of each component, carrying out cross correlation on each component and an original signal and selecting the component having the maximum similar feature with the original signal; and S2) carrying out noise elimination and reconstruction on the selected component through singular value difference spectrum to extract useful signals of different components and capable of representing original time series. The method carries out preprocessing on the side channel signals through combination of the EMD and the singular value difference spectrum, and can improve signal-to-noise ratio of energy leakage signals and success rate of attack.

A blind carrier frequency offset estimator is based on a single-OFDM-symbol training sequence in multi-user OFDMA uplink. Through multiple access interference modeling and analysis, a virtual user is employed that occupies the all null sub-carriers. By minimizing the energy leakage on the virtual user in term of tentative frequency offsets, the estimator can approach the real frequency offset. The estimator performs only on frequency-domain, simplifies interference calculations, and lowers the rank of the matrix. An iterative computation method is used to approach the real frequency offset.

The invention discloses a high-efficiency bench blasting method for interbedded rock mass and relates to the technical field of rock-mass blasting. The high-efficiency bench blasting method comprises the following steps of: step (1), primarily analyzing the geological structure of a blasting area; step (2), understanding detailed space information and interbedded structure of a blasting area; step (3), testing rock-mechanics properties of a main stratum of the blasting area, simplifying interbedded space information, establishing a blasting numerical model and analyzing an energy leaking area; and step (4) optimizing a blast-hole charging structure according to a simulation result, and adopting a sectional difference density charging method for charging. The high-efficiency bench blasting method disclosed by the invention has the beneficial effects that the main energy leakage area is explored by adopting a numerical analysis as a means, and the sectional difference density charging method is adopted, so that the problems of high boulder yield, more bedrocks and large explosive consumption in full-hole charging or common sectional charging are effectively reduced; and simultaneously, the high-efficiency bench blasting method is also conductive to reducing the operation time of field blasting, and has the advantages of simple process, low cost, good site operability and strong adaptability.

The invention discloses an omni-directional side lobe suppression method for synthetic aperture radar imaging processing. The method comprises the following steps of: arranging two-dimensional echo signals obtained by synthetic aperture radar into one-dimensional data; determining an imaging plane region position; constructing into a measuring matrix corresponding to an imaging plane; and finally, processing the one-dimensional echo data by using a linear least square method in combination with a measuring matrix, thereby realizing omni-directional side lobe suppression of a synthetic aperture radar imaging result and obviously reducing the energy leakage. Thus, the energy leakage of the imaging result of the processed satellite-borne echo data is the minimum, and further, the aim of suppressing side lobe is fulfilled. The omni-directional side lobe suppression method has no special requirement on target scattering intensity, can be used for imaging processing of any scene target and has a wide application range.

The invention provides an attack method and a system for a side channel password energy leakage signal. The method comprises the following steps: establishing an assumed energy consumption matrix andclassifying energy data by utilizing sub-key guessing; and carrying out data processing on the classification result and the energy leakage curve to obtain a statistical value, and then solving a meanvalue to obtain a discriminator value of the guessed sub-key at the time point; and judging whether all guessed sub-keys are traversed or not, and traversing the energy data at all time points; and if the abscissa corresponding to the maximum discriminator value is selected as the sub-key, comparing the sub-key with the real key to judge whether the cryptographic equipment is safe. In the attackprocess of the energy leakage signal, model assumption does not need to be carried out on the energy leakage signal, the method does not depend on any fixed or proportional model, and the real key ofthe cryptographic equipment is recovered only by analyzing the distribution characteristics of the energy leakage signal under different sub-key guessing conditions. Due to the fact that distributionof the leakage signals is directly analyzed and does not depend on a linear measurement mode, nonlinear characteristics of the energy leakage signals can be fully mined.

The invention discloses a multiple point cooperative data transmission method and device. The method comprises the following steps: channel information corresponding to a first UE (User Equipment) governed by a serving cell and channel information corresponding to one or more second UEs, governed by adjacent cells meeting a predetermined threshold, and the serving cell are received, wherein the first UE and the second UE occupy the same frequency resource; according to the channel information corresponding to the first UE and the channel information corresponding to the second UE, the first UE and the second UE are paired, and the paring enables the energy leakage of the signals of the first UE to the signals of the second UE to be lower than a predetermined requirement under the condition that the correct demodulation of the first UE is not affected ; and according to the result of the pairing, the transmission mode of the first UE and the dispatching modes of the first UE and the second UE are determined, and the multiple point cooperative data transmission is performed. The method overcomes the defects that the efficiency of the multiple point cooperative data transmission is lower because the multiple point cooperative data transmission cannot combine a multiple point cooperative mode for processing in the related art, and improves the efficiency of the multiple point cooperative data transmission.

The invention discloses a channel estimation method of a micro-power wireless communication system based on OFDM modulation, comprising the steps as follows: A, getting frequency domain channel estimated value of a valid pilot frequency subcarrier; B, establishing frequency domain channel estimated value of a virtual pilot frequency subcarrier and first frequency domain channel estimated value of a full spectrum band pilot frequency subcarrier; C, calculating first time domain channel impulse response estimated value corresponding to the first frequency domain channel estimated value; D, evaluating length of a time domain channel impulse response based on noise threshold dynamic evaluation algorithm of the time domain channel impulse response and filtering a channel noise to obtain second time domain channel impulse response estimated value; E, performing FFT conversion for the second time domain channel impulse response estimated value to obtain second frequency domain channel estimated value of the full spectrum band pilot frequency subcarrier. The method provided by the invention solves the problem of channel energy leakage and channel distortion brought by introducing a virtual subcarrier and improves the accuracy of channel estimation by combining with a self-adaption channel noise filtering method.

The invention discloses an ultrasonic auxiliary cutting device with a cutter fine adjustment mechanism. The ultrasonic auxiliary cutting device comprises the cutter fine adjustment mechanism and an ultrasonic vibration acoustics system; the cutter fine adjustment mechanism comprises a vertical plate vertically arranged on a base plate, and a dovetail sliding plate matched with the vertical plate; the vertical plate is connected with the dovetail sliding plate through a connecting plate; a screw rod is arranged in a connecting sleeve in the middle of the vertical plate through a screw nut; an index plate is arranged on the upper part of the connecting sleeve; a handle is arranged at the upper end of the screw rod; a supporting flange is fixedly connected with the connecting plate; the ultrasonic vibration acoustics system comprises an ultrasonic generator, an energy transducer, an amplitude transformer and an ultrasonic turning tool; and the ultrasonic vibration acoustics system is connected with the supporting flange through a fixing flange on the amplitude transformer. The ultrasonic vibration energy leakage of the device is lowest; by the cutter fine adjustment mechanism, the ultrasonic vibration acoustics system can move in the height direction; the fine mobile resolution is up to 0.01 millimeters; therefore, height adjustment of a tool nose of a cutter with an abraded blade and the precision cutting of a workpiece can be realized effectively.

The invention relates to an integral high-voltage-cable anti-explosion joint box used for protecting safety of a high voltage cable joint in an underground cable channel. The anti-explosion joint box comprises a cable support, a shell which is arranged on the cable support and forms one body and an anti-explosion fire extinguishing component arranged in a central-section anti-explosion chamber of the shell. The shell is in a shuttle-shape symmetrical structure. Two ends are provided with cable holes. The cable holes are provided with sealing components. A cable joint is arranged in the central-section anti-explosion chamber. The anti-explosion fire extinguishing component is connected to the cable joint. The shell is provided with a plurality of energy leakage hole guide pipes connected to the central-section anti-explosion chamber. Other spaces in the central-section anti-explosion chamber are filled with a fireproof thermal-insulation flame-retardant material. Compared to the prior art, the joint box possesses the advantages that moisture-proof, explosion-proof and fireproof performance is possessed; the joint box is safe and reliable; the structure is simple; cost is low and so on.

An improved system 100 and method of reducing RF energy leakage from being trapped in a gap (cavity) 178 between a battery 102 and printed circuit board (PCB) 104 in an electronic communications device 106 is provided by a RF shield assembly that can extend between the battery and the PCB. The RF shield assembly can comprise a conductive wrap 168 and conductive foam 170 connected to metal pads 138 and 140 along the ground plane 136 of the PCB 104.

An RF screen for microwave powered UV lamp systems is provided. The RF screen is formed of a single sheet of conductive material in which a mesh pattern has been formed. The screen includes a non-traditional mesh pattern including individual openings with 3 or more nodes. The RF screen is generally configured to optimize the balance between light transmission and RF energy leakage desired for the particular application. Generally, it is desired that the RF screen has an open area percentage greater than about 80% while limiting RF energy leakage from the microwave powered lamp system to acceptable levels.

A plasma-jet spark plug comprising an insulator and a ground electrode which are disposed apart from each other in an axial direction (O) to prevent a damage of the insulator. The spark plug is capable of reducing an energy loss of the ejected plasma by defining a dimension of a clearance between the insulator and the ground electrode whereby deterioration of the ignitability of the plasma-jet spark plug is prevented. Clearance having a first clearance dimension “a” is formed between a front end of the insulator and the ground electrode. Since a volume S of a cavity formed at the front end side of the insulator is set to 10 mm3 or less, plasma formed in the cavity is prevented from spreading. Further, since the first clearance dimension “a” satisfies a<=0.5 mm, the plasma ejected from the cavity is ejected toward the outside of the spark plug while keeping sufficient energy, so that it is unlikely that an energy leak in the first clearance occurs on the way to an orifice.

The invention belongs to the field of radar technology and communication technology, in particular to a tightly coupled antenna array with wide bandwidth, wide angle and low profile. The antenna arraycomprises a supporting member composed of a supporting plate, a supporting plate frame, a reflecting plate and a feeding joint, and an antenna line composed of a Wilkinson power divider, a feeding balun, a radiation current sheet and a frequency selection surface; The antenna line is laminated by two dielectric copper clad plates, and are divided into four layers: circuit structure layers of theupper and lower layers of an upper layer dielectric plate and circuit structure layers of the upper and lower layers of a lower layer dielectric plate; the first and fourth layers are in a symmetricalradiation structure, the second layer is an empty plate, and the third layer is provided with the power divider and balun. The first and fourth layers are electrically connected through conductive vias to provide a closed environment for the third layer and suppress energy leakage. The radiation current sheet is symmetrically distributed, which can reduce the impedance at the point where the balun is coupled with the current sheet. Frequency selective surface is located on the third layer, which can be used to replace the impedance matching dielectric layer on the current sheet, so that the antenna can be fabricated and installed more easily.

An RF screen for microwave powered UV lamp systems is provided. The RF screen is formed of a single sheet of conductive material in which a mesh pattern has been formed. The screen includes a non-traditional mesh pattern including individual openings with 3 or more nodes. The RF screen is generally configured to optimize the balance between light transmission and RF energy leakage desired for the particular application. Generally, it is desired that the RF screen has an open area percentage greater than about 80% while limiting RF energy leakage from the microwave powered lamp system to acceptable levels.

A method for testing acoustic emission signal transmission characteristics of a helicopter component based on a harmonic wavelet packet belongs to the technical field of acoustic emission detection for mechanical helicopter components, and solves the problems of energy leakage and inflexibility of frequency band selection when the acoustic emission signal transmission characteristics are analyzed by a traditional wavelet packet. The method includes: acquiring testing signals obtained by an acoustic emission sensor; determining a decomposition layer number j and a frequency bandwidth B and computing an upper limiting frequency m and a lower limiting frequency n; computing frequency domain and frequency band values of harmonic wavelets; transforming the testing signals by means of FFT (fast Fourier transform) algorithm to obtain frequency domain discrete values; computing wavelet transform of the frequency domain and frequency band values; computing time-domain signals xl (r); obtaining energy E1 by means of transforming; and normalizing the energy E1 to obtain average energy and an energy diagram of the testing signals of the helicopter component to be tested, thereby obtaining the acoustic emission signal transmission characteristics of the helicopter component to be tested. The method is applicable to testing of the acoustic emission signal transmission characteristics of the helicopter component.

The acoustic wave device comprises a substrate, a composite layer and an electrode layer which are sequentially stacked from bottom to top, the composite layer is provided with a closed groove in a preset shape, the composite layer comprises a temperature compensation layer and a piezoelectric layer which are stacked from bottom to top, and the electrode layer is located on the upper surface of the composite layer in the groove. Visibly, the composite layer is provided with a groove; the electrode layer is positioned on the upper surface of the composite layer in the groove; when sound waves are propagated along the transverse direction, the sound wave is reflected back by the edge of the piezoelectric layer positioned on the outer side of the groove; the energy of the sound wave is limited below the electrode layer, and transverse energy leakage is reduced; when sound waves are propagated in the longitudinal direction, due to the fact that the propagation speed of the sound waves of the substrate is higher than that of the composite layer, the sound waves are almost propagated only in the composite layer and cannot leak into the substrate, longitudinal energy leakage is restrained, the Q value is increased, and frequency deviation caused by temperature changes can be reduced due to the existence of the temperature compensation layer. The invention further provides a filteringdevice with the advantages.

The invention provides a method and a device for channel estimation. The method comprises the following steps: carrying out initial channel estimation on reference signals, estimating the amount theta of phase rotation needed by frequency domain response calculation of a channel on the positions of the reference signals, and carrying out theta phase rotation; according to relevance of each subcarrier, carrying out interpolation and filtering after theta phase rotation; and carrying out theta phase unwrapping rotation on a value after interpolation and filtering, and obtaining a channel estimation value of the reference signals. According to the method and the device for channel estimation, influence of channel tapping energy leakage caused by non-integral-multiple sampling on frequency domain filtering is considered during channel estimation, and therefore frequency domain filtering is accurate. Meanwhile, when a filter coefficient is calculated, influence of receiving in advance is considered, and therefore the filter coefficient is accurate. Thus, estimation results of the reference signals are accurate.

The invention provides a phasor measurement method in an electric-power system. The method includes the following steps: adopting a composite window used for inhibiting negative frequencies to process sampling signals; and carrying out Fourier transformation on the sampling signals processed by the composite window so that a phasor value is obtained, wherein the amplitudes of sidelobes corresponding to -48 to -52 HZ frequencies in the sampling signals processed by the composite window are smaller than a preset value. The method is capable of solving a problem, which exists in the prior art, that more high-frequency interferences and spectrum energy leakage exist in a rectangular window and Fourier transformation.