91 results about "Small peak" patented technology

The invention relates to a power battery-super capacitor hybrid power system for electric automobiles, belonging to the electric automobile technical field. The power battery-super capacitor hybrid power system for the electric automobiles comprises a power battery pack, a motor controller and a 24V storage battery, a boost DC / DC converter, a bi-directional DC / DC converter and a super capacitance group, wherein, the low voltage end of the boost DC / DC converter is connected with the output end of the power battery pack, the high voltage end of the boost DC / DC converter is connected with the motor controller; the super capacitance group and the high voltage end of the bi-directional DC / DC converter are directly hitched with the high voltage end of the boost DC / DC converter, and the low voltage end of the bi-directional DC / DC converter is connected with the 24V storage battery. The power battery of the power battery-super capacitor hybrid power system for the electric automobiles has smooth output current, small peak current, high discharge efficiency and long service life; when the battery pack SOC is lower, the hybrid system still ensures the normal power output capability; and the super capacitance can directly absorb the braking feedback energy and has high energy conversion efficiency.

The present invention provides a signal modulation method which includes the following steps: a input signal is channel encoded, and the channel encoded signal is processed by the following one or several ways: channel scrambling, interleaving, duplicating and puncturing; the signal being processed is divided into two components I and Q, wherein the two components I and Q compose a signal pair; the signal pair is divided into more than one path, and respective path of signal is quadrature phase shift keying spectrum spreading modulated using different spectrum spreading sequence and is orthogonally modulated in order that the peak-to-average power ratio of the respective paths of signal being orthogonally modulated are obtained; and a path of signal having the smallest peak-to-average power ratio is selected to be outputted as an output signal. The signal modulation method can reduce the signal PAPR significantly, not only is propitious to the design of the power amplifier, but also reduces the cost of the power amplifier.

An improved catalyst for hydrodesulfurization of heavy feedstocks is disclosed. The catalyst is adopted for on-stream catalyst replacement in upflow processing units. It is characterized by a smaller peak pore diameter than general purpose hydrotreating catalysts.

In a first aspect, in a Primary Side Regulation (PSR) power supply, some primary current pulses are used to forward bias an output diode such that an auxiliary winding voltage can be properly sampled after each pulse. The samples are used to regulate the power supply output voltage (VOUT). Other primary current pulses, however, are of a smaller peak amplitude. These pulses are not used for VOUT regulation, but rather are used to determine whether the VOUT has dropped. In a second aspect, a transient current detector circuit within the PSR controller integrated circuit detects whether an optocoupler current has dropped in a predetermined way. If the TRS current detector detects that the optocoupler current has dropped, then the power supply stops operating in a sleep mode and is made to operate in another higher power operating mode in which the power supply switches.

An arc fault circuit interrupter includes separable contacts, an operating mechanism, a current sensor sensing current flowing through the contacts and outputting a sensed current, and a processor determining and storing peak values of the sensed current for plural half-cycles. The processor provides arc fault detection, determines whether a first predetermined plurality of half-cycles occur in succession and correspond to non-unity power factor, and responsively inhibits the detection for a first predetermined time, and whether a second predetermined plurality of half-cycles occur in succession, each with smaller peak amplitude than that of an immediately preceding half-cycle of like or differing polarity, and responsively inhibits the detection for a second predetermined time. The processor determines that the detection is not inhibited for the first and second predetermined times, and responsively indicates that any of the half-cycles having a peak amplitude greater than a predetermined amount is a parallel arc.

The invention belongs to the technical field of power machine, and in particular relates to a starting system of a motor type free piston internal combustion power generation device. The invention provides two types. The first type comprises a first free piston internal combustion engine, a second free piston internal combustion engine, a connecting rod and a linear motor, wherein the first free piston internal combustion engine, the linear motor and the second free piston internal combustion engine are sequentially connected with one another, and the whole mechanism is eudipleural. The second type is provided with a first starting coil and a second starting coil. Three starting schemes are provided according to two system structures. The first starting scheme is simple and is easy to control, and an extra linear motor mode conversion circuit is not needed; the number of parts in the second starting scheme is small, so that the starting time is short; and according to the third starting scheme, the linear motor with relatively small peak value can be matched, and the size of the whole device can be reduced. A simulation and experiment result shows that the free piston internal combustion power generation device can be quickly started within one second.

The invention discloses a method and a device for online monitoring and positioning a turn-to-turn short circuit for a rotator of a water wheel generator, belongs to monitoring and protecting technology of the rotator of the water wheel generator, and aims at providing three types of methods and devices capable of carrying out online monitoring and positioning of the turn-to-turn short circuit for the rotator of the water wheel generator. The method comprises the following steps: synchronously acquiring inductive potential waveform of numbered and positioned magnetic poles through an induction coil in real time; sending the inductive potential waveform to a microcomputer and calculating an average value ep of a peak value of magnetic pole inductive potential, a pole average value vp; and comparing the smallest peak value e min of the inductive potential and the smallest pole value v min of the inductive potential with the ep and vp and making the judgment. The device comprises a positioning identification label (11), first and second separated circuits (13, 7), the microcomputer (3), a position sensor (12), a filtering amplifying circuit (8), an A / D transferring circuit (4), a magnetic pole induction coil (9), a frequency dividing circuit (15), a wave-shaping circuit (16) and a display (5), and a device is additionally provided with two pole amplifying circuit (6) on the basis of the devices.

The invention relates to a method for estimating the medium quality factor by utilizing the peak instantaneous frequency of the envelope of the seismic signal, which includes the following steps: 1) dividing the medium into several thin plates with the thickness of the distance between two adjacent geophones in the well; 2) for the i-th A small thin plate, use the constant phase wavelet to approach the direct wave received at its top, and determine its modulation frequency σi and energy attenuation factor δi, and calculate the ratio ηi=σi / 2πδi; 3) Calculate the travel of the seismic wave on the i-th small thin plate Time 4) Calculate the instantaneous frequency of the received signal at the upper and lower interfaces of the i-th thin plate; 5) Calculate the change Δfp(i)=fp(0)-fp(τi) of the envelope peak instantaneous frequency in the i-th small thin plate; 6 ) Substituting σi, δi, τi and fp(0)-fp(τi) into the analytical relationship between the envelope peak instantaneous frequency and the quality factor Q value to calculate the quality factor Q value of the i-th small thin plate: 7) Repeat steps From 2) to 6), calculate the quality factors of other small thin plates in turn; 8) use the quality factor Q value to predict the oil and gas of the reservoir.

The invention discloses a selective mapping scrambling method for reducing peak-to-average power ratio of an orthogonal frequency division multiplexing system, which comprises the steps: at a sending end, scrambling input binary sequences respectively by a plurality of scrambling sequences to generate a plurality of scrambled candidate sequences; then code-mapping these candidate sequences and simultaneously embedding auxiliary information into each candidate sequence in a manner of code-mapping, implementing inverse fast Fourier transform on these sequences respectively, and selecting the candidate sequence with the smallest peak-to-average power ratio from these candidate sequences for transmission; at a receiving end, implementing fast Fourier transform on the received sequences at first and then detecting the auxiliary information, and sequentially completing code de-mapping and descrambling by using the detected auxiliary information in order to obtain data sent by the sending end. The method not only can greatly lessen computer complexity, but can also obtain optimal peak-to-average power ratio performance without the need of transmitting the auxiliary information, thereby enhancing the overall performance of the OFDM system.

A pressure-sensitive adhesion-processed sheet which can be easily stuck without forming blisters by air-entrapment, is less expensive, can be easily re-stuck, and has favorable working characteristics. The pressure-sensitive adhesion-processed sheet includes a sheet base material and a pressure-sensitive adhesive layer having plural small valleys and plural small peaks.

A power circuit is provided which has a small peak value of a current from a power source even in the case of a load in which a load current repeats periodically and alternately a burst flow in a burst period and a non-burst flow in a non-burst period. The above power circuit is provided with a power source section, a power controlling section, and an energy storing section having a storage capacitor being connected to an output terminal, a current controlling circuit to control values of detecting resistors according to a result of detection of a voltage input from a power source section and a control switching device having a field effect transistor switch being connected between input and output terminals and a circuit made up of a capacitor in which a flowing period of an output current is controlled by exerting the field effect transistor switch according to a control signal being produced by detecting a change in an input power voltage using a voltage occurring at another terminal of the detecting resistor.

The invention discloses an array plane layout method for a space-borne SAR (Synthetic Aperture Radar) phased-array antenna and relates to a radar antenna technology. The array plane layout method comprises the following steps of: under the condition that the number of azimuth T / R (Transmit / Receive) assemblies (or phase shifters) of the phased-array antenna is not changed, dividing an array plane of the antenna into a plurality of unequal subarrays along the range direction; staggering along the azimuth direction of the antenna by using each subarray as the unit, wherein a staggering distance is about one second of a spacing of each two adjacent T / R assemblies in the range direction; and discretizing single big-peak scanning grating lobes of a regular rectangular lattice structure into a plurality of distributed small-peak grating lobes, so that the peaks of the scanning grating lobes in the azimuth direction are greatly reduced and the influence of the big-peak grating lobes on a radar system is reduced. The larger the number of the subarrays which have different spacings and are formed by dividing the antenna in the range distance is and the more the types of spacings between the subarrays are, the better the effect of discretizing the big-peak grating lobes is, however, the complexity of layout of a feed network of the phased-array antenna, the design of an antenna frame and the like are also increased. An array plane layout scheme suitable for the engineering application is obtained by comprehensively considering the complexity of the layout of the feed network and the design of the antenna frame and the effect of discretizing the scanning grating lobes in the azimuth direction.

A fluid dynamic pressure bearing composed of a cylindrical sintered compact includes: a thrust region which is formed on an end surface of the bearing and receives at least a thrust load; a roughed portion having small peaks and valleys formed on the thrust region; and thrust recesses for generating thrust fluid dynamic pressure, which are formed on the thrust region.

The invention relates to a coal-gas combined heating supply method, belonging to HVAC area. The first step of said method is that small peak-shaving boiler with burning gas, as peak-shaving thermal source, running with the parallel of central heat network, is set in each thermal station of civil thermal network with the heat source, which is the boiler in the huge heat supply or coal-burning region. Said secondary backwater is that first heat exchanger obtains quantity of heat generated by the boiler of coal-burning thermal power station or huge coal-burning region and transmitted by the first pipe network, and then it is heated furthermore by small gas-burning peak-shaving boiler so that independent adjusting in time on each heat supply region is accomplished. Thermal resource only bears the basic load of heat supply and the lack of heat is compensated by small gas-burning peak-shaving boiler in each thermal power station. The heat value is changed as the relation of climate and requirement changes. Said first network also bears adjusting action.

Provided is a transmission method of multi-carrier data. According to the transmission method, data are transmitted by means of at least two sub carriers and at least two component channels. The transmission method of the multi-carrier data is characterized in that each component channel for transmitting data comprises multilevel and multi-rate sub carriers which contain harmonic wave deviation modulation sub carriers. Carriers in the same layer are orthogonal in time domain, the spectrum of one sub carrier is overlapped with the spectrum of another sub carrier in the same layer, and the two sub carriers can not be isolated with a segmentation frequency spectrum and by a filter. Signals are combined in a multiply method through the sub carriers which are overlapped in spectrums in the same layer and the sub carriers which are overlapped in spectrums in an adjacent layer, orthogonal component channels or approximate orthogonal component channels can be distinguished through related demodulation, and the number of the component channels is the product of the number of sub carriers in each layer. The transmission method of the multi-carrier data is further characterized in that by means of the Fourier series and a fraction code rate orthogonal function, the number of the component channels with preset bandwidth and time width is increased, new component channels are added on the basis of the existing component channels, and similar performance is achieved with a smaller peak-to-average power ratio compared with the prior art.

The invention discloses a multi-rate peak clipping method and device. The multi-rate peak clipping method includes that a multi-rate peak clipping device uses a preset first speed rate peak clipping threshold and a preset first peak clipping coefficient to carry out primary digital peak clipping on a multi-carrier superposed signal after performing multi-carrier superposition; the multi-rate peak clipping device uses a preset second speed rate peak clipping threshold and a preset second peak clipping coefficient to carry out secondary digital peak clipping on an interpolated signal after performing signal interpolation. According to the embodiment, the multi-rate peak clipping mode is used for clipping signal peaks, the signal peak recurrence after interpolation can be avoided, the peak clipping effect is good, the peak clipping hardware resource can be saved, the peak clipping performance is improved, and the problems of large peak lifting, peak regeneration, signal quality degradation and the like after the multi-carrier superposition can be solved. The multi-rate peak clipping mode clips large-peak signals through low-speed peak clipping, and the peaks of the reserved small-peak signals are clipped in a high speed in subsequent.

Method for forming a metallic component surface to achieve lower electrical contact resistance. The method comprises modifying a surface chemical composition and creating a micro-textured surface structure of the metallic component that includes small peaks and / or pits. The small peaks and pits have a round or irregular cross-sectional shape with a diameter between 10 nm and 10 microns, a height / depth between 10 nm and 10 microns, and a distribution density between 0.4 million / cm2 and 5 billion cm2.

An anti-repeater deception jamming method and detection system based on FPGA are provided. Through an FPGA design scheme, normal satellite signals are locked in a capture stage. The peak values of thesignals are detected, and all correlation peaks are found; a threshold V1 is set, the found correlation peaks are filtered, and small peaks caused by noise are eliminated; the largest and second largest peak values and the corresponding code phases and Doppler frequencies are found; a threshold V2 is set to make judgment; if the second largest peak value is smaller than the threshold V2, it is judged that there are only normal satellite signals, and the code phase and Doppler frequency corresponding to the largest peak value are locked; and if the second largest peak value is larger than thethreshold V2, it is judged that there is repeater deception jamming, and the smaller code phase and the corresponding Doppler frequency are locked. According to the invention, satellite signals are detected in the capture stage, normal satellite signals are captured if there are repeater deception jamming signals, and therefore, the purpose of anti-repeater deception jamming is achieved.

The invention discloses a synchronization method of ultra wide band communication technology and relates to an ultra wide band synchronization method. The method comprises the following steps. Firstly, peak noise serves as a threshold, and long sliding step length is used for performing cross-correlation. When a ratio of the peak noise exceeds the preset threshold, a received signal is regarded to be captured correctly. Secondly, a small peak signal is output through a correlator, a smooth envelope curve output by the correlator is generated by secondary enveloping. Thirdly, the highest point of the envelope curve output by the correlator is taken as a center so as to confirm a thin synchronization interval. Fourthly, small sliding step length undergoes correlation again on the thin synchronization interval which is confirmed, and a peak value output by correlation is obtained and corresponding time shifting of a pilot frequency sequence is calculated. The problem of accuracy in confirming the thin synchronization interval by performing cross-correlation of the small sliding step length and obtaining the peak value, and precision in time delay estimation is improved.

A lithium secondary battery of the present invention has a positive electrode is provided with a positive electrode mix layer that includes a positive electrode active material and a conductive material. The positive electrode mix layer has two peaks, large and small, of differential pore volume over a pore size ranging from 0.01 μm to 10 μm in a pore distribution curve measured by a mercury porosimeter. A pore size of the smaller peak B of the differential pore volume is smaller than a pore size of the larger peak A of the differential pore volume.

An arc fault circuit interrupter includes separable contacts, an operating mechanism, a current sensor sensing current flowing through the contacts and outputting a sensed current, and a processor determining and storing peak values of the sensed current for plural half-cycles. The processor provides arc fault detection, determines whether a first predetermined plurality of half-cycles occur in succession and correspond to non-unity power factor, and responsively inhibits the detection for a first predetermined time, and whether a second predetermined plurality of half-cycles occur in succession, each with smaller peak amplitude than that of an immediately preceding half-cycle of like or differing polarity, and responsively inhibits the detection for a second predetermined time. The processor determines that the detection is not inhibited for the first and second predetermined times, and responsively indicates that any of the half-cycles having a peak amplitude greater than a predetermined amount is a parallel arc.

The invention provides a sideband-information-free shallow sea underwater acoustic communication pattern selection peak-to-average ratio restraining algorithm based on a frequency reversal mirror technology. At a data sending end, scrambling is carried out on data to be sent through M sets of different scrambling patterns, meanwhile, M sets of different comb-shaped pilot frequency positions are defined as signs, comb-shaped pilot frequency sequences are added to different pilot frequency positions to obtain candidate OFDM symbols, fast Fourier inversion is carried out on the candidate OFDM symbols to a time domain, and the symbol with the smallest peak-to-average ratio is selected as a transmission symbol; at a receiving end, fast Fourier inversion is carried out on received signals, frequency domain received information corresponding to the different comb-shaped pilot frequency positions is extracted to obtain pilot frequency domain response, matching pursuit is carried out on the pilot frequency domain reesponse, M sets of channel frequency domain response are restored, in frequency domain reversion, the cross correlation coefficients of the pilot frequency domain response and the channel frequency domain response is calculated, the value m corresponding to the maximum value in the M correlation coefficients is obtained, and finally descrambling is carried out through serial number information. The algorithm can guarantee the real-time performance and the reliability of an MIMO-OFDM underwater acoustic communication system.

The invention discloses a transmission type laser beam shaping system, which comprises a transmission type phase modulation mirror, a spatial filter and a transmission type collimator, wherein an incident surface of the transmission type phase modulation mirror consists of concave and convex spaced concentric toroidal surfaces with different heights, the adjacent convex surfaces and concave surfaces correspond to adjacent peaks of a laser beam, and an emergent surface of the laser is a concave surface; the spatial filter is used for selecting modes of an output beam of the transmission type phase modulation mirror, so that the central main peak beam of the output beam can pass through, and secondary small peaks are reflected and absorbed; and the transmission type collimator is used for compressing a divergence angle of the selected main peak beam, so as to obtain single-mode laser with small divergence angle and low energy loss. The transmission type laser beam shaping system provided by the invention has the advantages of simple structure and convenient adjustment, is high in power of the fundamental mode of the obtained beam, and can be applied to a variety of laser processing processes such as laser cutting, welding and punching.

For the purpose of increasing the electric capacity of lithium secondary batteries comprising titanium-based negative electrode materials, the present invention aims to produce a titanium oxide compound whose crystal structure, crystallite size, specific surface area and primary particle size are controlled, and to provide a lithium secondary battery comprising such a compound. The present invention produces a lithium secondary battery by using, as an electrode active material, a titanium oxide compound for use in an electrode, which is represented by TiO2.(H2O)a.(A2O)b (wherein A is Na or K, a is 0<a=1, and b is 0<b=0.1) and has a main peak at 2&thetas;=20° to 30° and a minor peak at 2&thetas;=45° to 55° in its X-ray diffraction pattern, wherein the crystallite size determined from the main peak ranges from 40 Å more to 500 Å or less.

The invention relates to a composite steel plate. The composite steel plate is characterized by at least comprising an upper layer plate, an interlayer and a lower layer plate, wherein the upper layer plate can be a steel plate or a glass plate, if the upper layer plate is a steel plate, one or more peak parts can be arranged on the steel plate; the interlayer is produced by glass foaming or made of foamed glass and combined by a plurality of units, and a plurality of empty grooves are formed in the interlayer, thereby having the effect of saving material and simultaneously achieving the effects of heat insulation and flame resistance; the lower layer plate can be arranged or not necessary to arrange, if the lower layer plate is arranged, the lower layer plate can be a steel plate or a glass plate, if the lower layer plate is a steel plate, one or more small peak parts can be arranged on the steel plate, or the lower layer plate can be shaped into a flat plate; and gluing material can be coated on the lower side of the upper layer plate or the upper side of the interlayer to combine the upper layer plate or the interlayer into a whole; if the lower layer plate is arranged, the gluing material can be simultaneously coated on the upper side of the lower layer plate or the lower side of the interlayer during the step of coating the gluing material so as to combine the lower layer plate or the interlayer into a whole; therefore, the composite steel plate which is combined by the upper layer plate and the interlayer and has fire resistance and flame resistance is generated; or the composite steel plate with the fire resistance and the flame resistance is formed by combining the upper layer plate, the interlayer and the lower layer plate.

The invention discloses a method for combined power supply based on an industry mean peak-valley difference rate. The method comprises the following steps that the typical industries and the typical day of an area with combined power supply to be carried out are selected; representative users are extracted from the selected typical industries, and statistics is carried out on the peak-valley difference rate of the representative users in the typical day; statistics is carried out on the peak-valley difference rate section of each typical industry to obtain the industry mean peak-valley difference rate; load classification is carried out on the selected typical industries; the industries with the large peak-valley difference and the industries with the small peak-valley difference or the industries with complementary peaks and valleys are classified into the same transformer or transformer substation, and combined power supply is carried out. The influence of load characteristics on a power distribution network and electric energy quality is fully considered, and the problems that at present, the uneven loads of the transformer are ubiquitous, and the capacity-load ratio of the transformer substation is too low can be effectively solved.

A polyamide resin foam-molded article characterized by containing polyamide resin and having a degree of crystallization X of 10-50% and a crystallite size D of 10 nm or greater when calculated on the basis of the peak having the smallest peak width in the x-ray diffraction profile, and a method for producing the same.

A pressure-sensitive adhesion-processed sheet which can be easily stuck without forming blisters by air-entrapment, is less expensive, can be easily re-stuck, and has favorable working characteristics. The pressure-sensitive adhesion-processed sheet includes a sheet base material and a pressure-sensitive adhesive layer having plural small valleys and plural small peaks.

The present invention relates to an orthogonal spreading code in a code division multiple access (CDMA) mobile communication system, and more particularly, to a method for generating and allocating code or code pairs on the basis of an orthogonal code set, which is generated using orthogonal spreading codes, so as to reduce a peak-to-average power ratio and enlarge the length of an interference free window. In accordance with the invention, at least one orthogonal code set is generated based upon orthogonal spreading codes, one of the at least one orthogonal code set is determined as a representative orthogonal code set, and then the order is allocated according to rules determined based upon the representative orthogonal code set. The codes or code pairs are generated and allocated using the orthogonal spreading codes, so as to reduce a Peak-to-Average Power Ratio or extend the length of an interference free window (IFW).