143results about How to "Eliminate performance impact" patented technology

The invention relates to a process for preparing a high-activity semi-hydrated gypsum cementing material and a gypsum product by the aid of phosphorous gypsum. The process includes technical processes of 1) a pretreatment process for the phosphorous gypsum; 2) a normal-pressure water heating reaction process; 3) a slurry preparation process; and 4) a preparation process for the high-activity semi-hydrated gypsum cementing material and the gypsum product. The process for preparing the high-activity semi-hydrated gypsum cementing material and the gypsum product by the aid of the phosphorous gypsum has the advantages that a process for preparing the high-performance semi-dehydrated gypsum cementing material by the aid of the phosphorous gypsum is completed under the normal-pressure mild condition, the process can be combined with an independent gypsum product manufacturing process to produce gypsum blocks, gypsum plates or other semi-hydrated gypsum products, and production flexibility of the technical processes is realized. In addition, owing to normal-pressure conversion, investment cost and running cost are saved, the processes are easily controlled, reliability is improved, performances of the product are excellent, materials are wet during the process which adopts wet phosphorous gypsum raw materials and produces the product, flying dust is prevented, waste is utilized, and effects of saving energy and protecting environments are realized.

The invention discloses a fully differential reset delay adjustable frequency and phase discriminator, which comprises four RS triggers, nand gates G0, a delay control circuit DL and two output buffer circuits, wherein all the four RS triggers have the structures that two nand gates are crossed and coupled; all nand gates are fully differential static CMOS (Complementary Metal Oxide Semiconductor) logics with positive feedback; the DL delay circuit is formed by cascading three delay fixed units and three delay controllable units; and each buffer circuit is formed by cascading fully differential phase inverters with transistors of multiplied sizes and positive feedback. Reset signals generated by the nand gates G0 are delayed by the DL circuit to perform reset control on the four RS triggers; and four paths of pulse control signals are output by the second RS trigger and the fourth RS trigger through the buffer circuits which are connected with the second RS trigger and the fourth RS trigger respectively. The discriminator has the advantages of small phase discrimination error, controllable reset delay, high driving capacity and high matching degree output of the four paths of pulse control signals and can be used for a high-performance phase locked frequency synthesizer.

The invention discloses a device for a rapid-heating quasi-static high-temperature Hopkinson pressure bar experiment. The device adopts the technical scheme that a sample is mounted in the middle of a ceramic sleeve at the center of a high-frequency induction heater in a shielding cover; the both ends of the sample are connected with the inner ends of two short ceramic bars; the outer ends of the two short ceramic bars are connected with one end of an incidence bar and one end of a transmission bar respectively; stress wave signals of strain gages are measured from the incidence bar and the transmission bar respectively, and sent to a computer for data processing through an electric bridge and an amplifier; the computer controls the warming of the high-frequency induction heater and the sample through a temperature controller; and the sample temperature is fed back to the temperature controller by another infrared monitor. The device overcomes the defects that the available device for the split Hopkinson pressure bar experiment is complicated in structure, complicated to operate, low in working efficiency and difficult in data processing; and the quality of the experiment is influenced seriously. The device is suitable for the Hopkinson pressure bar experiments in different laboratories, in particular to the heating of the sample and the immediate processing of the information of the strain gages.

A method and system are disclosed in which a management module (MM) designates an idle blade in a client blade farm to be an “administrative blade” that has administrator access to the virtual images of all users. The MM identifies when a particular user image is, or is not, in use and conveys this information to the administrative blade. The administrative blade performs virus scans, backups, defrags, patch installs, software upgrades, and other such maintenance functions on user images when they are inactive, thereby eliminating the performance impact to active users.

The invention belongs to the radar signal processing technology field and discloses a wideband signal DOA estimation method based on sparse representation of a covariance matrix. The method is used for estimating a wideband signal DOA. The method comprises the following steps of step1, establishing a wideband signal frequency domain model; step2, obtaining the covariance matrix at a reference frequency through focusing processing based on the wideband signal frequency domain model; step3, using the covariance matrix at the reference frequency to carry out sparse representation and constructinga target function about a sparse vector b0; and step4, solving the target function, obtaining the sparse vector b0, and determining an incident angle of a wideband incident signal according to a position corresponding to a non-zero element of the sparse vector. In the invention, an information source number does not need to be estimated, a direction of arrival of the signal can be accurately estimated in the case of a low signal to noise ratio, low snapshot, and a low angle interval, and a detection probability and resolution accuracy are high.

The invention discloses a manufacturing method of a high-density pure-rhenium test tube. The manufacturing method comprises the following steps: 1) preparing raw materials, that is, carrying out radio-frequency plasma spheroidization on high-purity rhenium powder; preparing high-purity spherical rhenium powder or high-purity sphere-like rhenium powder of which the spheroidization rate is not less than 80% and the average particle size is 5 to 35 mum; 2) carrying out aging treatment on the rhenium powder, that is, carrying out the aging treatment on the rhenium powder subjected to the spheroidization in a protective atmosphere II; 3) forming, that is, putting the rhenium powder which is subjected to the aging treatment into an elastic die sleeve; using cold isostatic pressing techniques to carry out pressing to form and manufacture a test tube green compact; 4) sintering, that is, placing the formed test tube green compact in a high-temperature sintering furnace, and sintering in a protective atmosphere IV; 5) machining to manufacture a test tube finished product. Finally, the high-density pure-rhenium test tube of which the density is greater than 20.2g/cm<3> (the theoretical density is 96%) and the ratio of the length to the outer diameter is greater than 15 is manufactured.

The invention provides a composite fire detector applied to an airplane cargo space special environment. The composite fire detector comprises a sensor module, a central control module, a power module, a CAN bus transmission module and a sound-light alarm module. The sensor module is formed by connecting in parallel a smoke sensor, a heat sensitive sensor, a carbon monoxide sensor, a pressure sensor and a humidity sensor. The central control module reads data of smoke, temperature, carbon monoxide concentration, pressure and humidity in the sensors in real time, automatically adjusts alarm threshold values are according to the pressure and humidity, and identifies interference sources and real fires in the environment. The sound-light alarm module is controlled by the central control module to send out an alarm indication or not. Under the condition that the network is connected, the CAN bus transmission module sends output signals of the central control module to a control platform. The composite fire detector can collect and analyze fire feature parameters and environment parameters so as to avoid the phenomenon that the composite fire detector mistakenly gives out an alarm due to changes of regional environment parameters, and can quickly detect the fires in the early stage.

The invention discloses an adaptive estimation method for a spatially non-uniform sea clutter covariance matrix. The method comprises the following steps of first performing NSCM (normalized sample covariance matrix) estimation by utilizing a reference sample to obtain an NSCM estimation value, and preprocessing the NSCM estimation value; then determining a normalized outer product matrix of the reference sample, and preprocessing the normalized outer product matrix; next calculating a weighting coefficient by utilizing preprocessing data obtained by the two preprocessing; and finally substituting the weighting coefficient into an estimation algorithm for a diagonally loaded adaptive covariance matrix to obtain a final covariance matrix estimation value. According to the method, the aim of adaptively reflecting statistical properties of sea clutters is fulfilled, the influence of clutter power on the performance of a detector is eliminated, and the problem of finite usable reference samples is solved; and the method can be applied to covariance matrix estimation under a non-uniform sea clutter background.

The invention discloses a parallelism-adjustable micro-electro-mechanical system Fabry-Perot cavity wavelength tunable filter. The surface of a micro-bridge part is used as an upper electrode of the Fabry-Perot cavity; a grating is located at the center of the surface of the micro-bridge part; the bottommost layer is used as a substrate; a plurality of lower electrodes are distributed below the micro-bridge part in symmetry and in parallel, and respectively fixed on two insulation layers; the two insulation layers cover on the substrate and are used for electrically insulating the plurality of the lower electrodes from the upper electrode; two rectangular holes are formed at two sides of the micro-bridge part; the front cavity surface is located at the lower surface of the bridge surface corresponding to the grating area; the rear cavity surface is located at the upper surface of the substrate which is located below the grating and between the two insulation layers as the rear cavity surface of the Fabry-Perot cavity; and different voltages are applied between the plurality of the lower electrodes and the upper electrode so as to form a complex electrostatic field, so that the movable cavity surface of the Fabry-Perot cavity can be adjusted in appearance while moving downwards, thereby adjusting the parallelism between the front cavity surface and the rear cavity surface of the Fabry-Perot cavity.

The invention discloses a transmitter-receiver joint frequency selective IQ imbalance estimation and compensation method for self-loopback structures, comprising the following steps: aiming at amplitude distortion and phase deviation of in-phase (I) and quadrature (Q) signals at a radio-frequency front end and different frequency responses of the two signals, designing two self-loopback structures to cascade an up-conversion unit and a down-conversion unit of the signals to obtain two IQ imbalance models; using a frequency domain training sequence to obtain two cascaded equation sets through the two self-loopback structures, solving the cascaded equation sets, and respectively estimating the parameters needed for compensating the frequency points of frequency selective IQ imbalance of a transmitter and a receiver; and compensating frequency selective IQ imbalance of the transmitter and the receiver in a frequency domain according to the compensating coefficients of the frequency points. The method of the invention is low in computing complexity, and can improve the system performance obviously.

The invention belongs to the technical field of sequential approximation analogue to digital converters and relates to offset voltage elimination technology for a differential time domain comparator circuit. In the technology, a charge pump, a switch circuit, an absolute value comparison circuit, a differential voltage time change-over circuit with an offset compensation tube, a frequency discrimination and phase discrimination circuit, a phase discrimination circuit and an output generating circuit are arranged. The technology can be applied to a low-speed and high-accuracy sequential approximation analogue to digital converter with a differential structure, can eliminate the offset voltage of a differential time domain comparator circuit and can be used for realizing low-power consumption and high-accuracy comparison. When the technology is applied to the sequential approximation analogue to digital converter, circuit consumption can be lowered, the influence of direct current offset of the comparator on the performance of the analogue to digital converter is eliminated and the accuracy of the analogue to digital converter is enhanced.

An embodiment of the invention provides a biomass boiler furnace temperature and load forecasting method. According to the method, Pearson correlation coefficient is used to describe correlation between operating parameters and furnace temperature, and the correlation coefficient is used as the basis for data screening. Principal component analysis is performed on a screened data set, principal component parameters are used as input of a neural network, two-stage neural network forecasting models for furnace temperature and boiler load are established to forecast the boiler furnace temperature, the obtained furnace temperature, furnace outlet oxygen concentration, furnace pressure, induced draft fan outlet flue gas flow and other parameters are used as input of the next-stage neural network to forecast the boiler load. According to the method, the data volume and calculation amount are reduced by data screening and principal component analysis; not only are the first-stage neural network prediction data adopted, but also information of original data is directly used, and forecast results are faster and more accurate.

The invention discloses an operating voltage control circuit and method and a memorizer. The control circuit comprises a boosting unit, a dividing unit, a comparing unit, a control unit and an output unit, wherein the boosting unit conducts boosting processing when receiving a first signal to output a boosting voltage and stops boosting processing when receiving a second signal, and the output boosting voltage is maintained at a current value; the dividing unit is used for conducting dividing processing on the boosting voltage to output a dividing voltage which comprises multiple different dividing coefficients; the comparing unit is used for comparing the dividing voltage with a reference voltage, outputting the first signal when the dividing voltage is smaller than the reference voltage and outputting the second signal when the dividing voltage is larger than the reference voltage; the control unit is used for conducting switching control over at least a part of the dividing coefficients from large to small till the boosting voltage reaches a target voltage; the output unit is used for outputting the boosting voltage. According to the operating voltage control circuit and method and the memorizer, on the basis of effectively controlling the establishing speed of an operating voltage, the influences on the power and performance of a device due to a threshold voltage and changes of the threshold voltage in the using process are eliminated.

The invention relates to a high-performance ordering method for a MapReduce calculation frame. The method comprises the steps that buffer chains are respectively constructed in the Map stage according to partitions, the requirement that the partitions are ordered is removed, data of each partition are organized according to blocks, and the cost of data in copy and file IO aspects in internal storage is lowered; the ordering operation is not executed in the Map stage, a large buffer pool is adopted as the basic unit of ordering of one time in the Reduce stage, and the total merging approach quantity in the ordering merging state is made to be a value capable of being adjusted and optimized by a user. Through a mixed internal storage ordering algorithm, the two ordering stages in the MapReduce calculation frame are optimized, the influence of ordering on the performance of the calculation frame is basically eliminated, and then the resource validity of the calculation frame is improved, and the overall resource consumption of a cluster is reduced.

The invention discloses a method for enhancing bridge health monitoring structural response and temperature data correlation convergence. The method comprises the steps that 1, bridge health monitoring system temperature data and corresponding structural response data in time are obtained; 2, a best-smooth algorithm is utilized for conducting smooth treatment on monitoring data; 3, the influence of a monitoring data time-lag effect on data correlation is eliminated by using a Fourier series theory, and meanwhile the dispersing action of frequency components of two data signals on a correlation relationship is reduced; 4, a multiple linear regression method is adopted for calculating an equivalent temperature and calculating a correlation coefficient between the structural response data and equivalent temperature data after time lag eliminating. Accordingly, the influence of factors such as data random fluctuation, the time-delay effect and the frequency components on the correlation coefficient can be effectively eliminated, and therefore convergence of correlation between the bridge health monitoring system structural response and the temperature data is enhanced, and great significance in bridge health monitoring early warning and evaluation is achieved.

The invention relates to a novel high-efficiency metal composite filter component. The filter component provided by the invention is characterized by comprising a substrate and a metal film layer attached to the surface of the substrate, wherein the substrate comprises a metal substrate and a metal wire net; the metal substrate is molded by pressing and sintering metal powder; the metal wire net is embedded into the metal substrate; the wire diameter of the metal wire net is 0.5-2mm; the particle size range of the metal powder is 50-300mu m; the thickness of the substrate is 2.0-3.5mm; and the thickness of the metal film layer is 0.1-0.2mm. Compared with the prior art, the metal porous component provided by the invention has the advantages of high osmotic coefficients and ideal particle size range; and the metal filter component prepared by utilizing the invention has the advantages of high bonding strength, large osmotic coefficients, good surface quality, convenience in regeneration and cleaning, simplicity in process and good repeatability and is suitable for large-scale industrial production.

The invention discloses a method for removing excessive citrate contained in a gold-plating solution, which uses a solid matter or a water solution, containing calcic materials, as a regeneration treating agent and comprises the following steps of: adding the solid matter or the water solution, containing the calcic materials, into a solution to be treated so as to generate calcium citrate sediments; and filtering to obtain a regenerated citrate gold-plating solution, wherein the regenerated citrate gold-plating solution can be put into normal production for use after being regulated in pH value and replenished with an additive. The invention can effectively remove the excessive citrates generated by continuously adding potassium citrate in the citrate gold-plating production process and enable the citrate gold-plating solution to be used for a long time by keeping a good state all the time; and besides, the invention has low cost, easy operation, and the like in treating the citrate gold-plating solution.

A design method for a reverse class-F power amplifier based on 3/4 spiral virtual ground structure comprises the steps as follows: confirming the work frequency of the power amplifier and obtaining the harmonic frequency of a harmonic control circuit; changing the dimension of the 3/4 spiral structure and designing corresponding harmonic control circuit according to the needed harmonic frequency in the design; inserting the harmonic control circuit into the output end of a power amplifier tube and designing the input-output matching circuit of a power amplifier circuit; and designing the input-output parameters of the power amplifier through measurement, and adjusting the length of a magic line to reach the maximum work efficiency. The amplifier designed by adopting the method comprises an input matching circuit, a power amplifier circuit, a harmonic control circuit and an output matching circuit which are connected onto a microstrip line in sequence; the harmonic control circuit comprises a 3/4 spiral virtual ground structure arranged below the microstrip line, and the virtual ground structure is formed by a complete spiral virtual ground structure cut by 1/4; and the 3/4 spiral virtual ground structure comprises two spiral structure parts connected with each other and in axial symmetry along the microstrip line.

The invention discloses an improvement method for stacked package of a three-dimensional chip of a microsystem. According to the improvement method, an application specific integrated circuit (ASIC) chip and an application processor are fixed on a traditional substrate by a silica-based transition board, the problems of difficulty in heat dissipation, stress damage, low integration density and the like faced by the traditional substrate can be fundamentally solved. With the improvement method disclosed by the invention, the silica-based transition board is simply and ingeniously applied to microsystem package, the influence of package stress on the microsystem performance is substantially eliminated, and interconnection with super-high density and calculation and storage capabilities with high performance are achieved.