303results about How to "Reduce order" patented technology

Thermochromic filters are constructed using absorptive, reflective, or fluorescent dyes, molecules, polymers, particles, rods, or other orientation-dependent colorants that have their orientation, order, or director influenced by carrier materials, which are themselves influenced by temperature. These order-influencing carrier materials include thermotropic liquid crystals, which provide orientation to dyes and polymers in a Guest-Host system in the liquid-crystalline state at lower temperatures, but do not provide such order in the isotropic state at higher temperatures. The varying degree to which the absorptive, reflective, or fluorescent particles interact with light in the two states can be exploited to make many varieties of thermochromic filters. Thermochromic filters can control the flow of light and radiant heat through selective reflection, transmission, absorption, and/or re-emission. The filters have particular application in passive or active light-regulating and temperature-regulating films, materials, and devices, and particularly as construction materials and building and vehicle surfaces.

Systems and methods for regulating the throughput of a channel between a gateway and one or more subscriber terminals are disclosed. Various embodiments of the invention provide for monitoring link utilization between a gateway and a subscriber terminal at, for example, the physical layer of the OSI model. Based in part on the link utilization the link throughput may be throttled at a layer higher than, for example, the transport layer. Regulating may occur by advertising a decreased TCP window size or intelligently dropping packets. In another embodiment, a subscriber terminal may estimate the signal to noise ratio of a forward link channel and communicate this SNR to the gateway. The gateway may adjust the modulation and/or coding of the signal in response to the SNR. The gateway may also throttle deliver of packets in response to changes these changes in the modulation and/or coding of the signal.

The invention discloses a method for identifying an RC (resistor-capacitor) equivalent model of a power battery. The method comprises the following steps of: confirming an identification equation of the RC equivalent model, acquiring identification data, calculating an internal discharge resistance of the battery and identifying a least square method. According to the method, the dynamic and static features of the battery are reflected well; on one hand, the model has a relatively high precision characterization electric quantity parameter, and the charge and discharge behaviors of the battery can be simulated accurately under the condition that the temperature, the current and the internal resistance difference in the charge and discharge process are considered; and on the other hand, the model is relatively low in order, so that complex mathematic calculation is avoided, and the structure is relatively simple, thereby being conveniently processed in a computer. Therefore, the method for establishing a mathematic model by using the method for identifying the RC equivalent model of the power battery can be widely used in the research of the power battery, and particularly the research of a lithium ion battery.

The invention relates to an interference elimination system and method based on pre-equalization and belongs to the field of communication and signal processing. At a receiving end, a received signal is divided into two paths, one path signal is sent to an interference elimination self-adapting filter and serves as an input signal of the interference elimination self-adapting filter, the other path signal is sent to a pre-equalization computing module, weight is computed by the pre-equalization computing module according to the received signal or a channel estimated value, and the computed weight is enabled to be sent to a pre-equalizer of an interference emission end. At the interference emission end, an emission signal is divided into two paths, one path signal serves as a referential signal and is sent to the interference elimination self-adapting filter at the receiving end, the other path signal is sent to the pre-equalizer, and pre-equalization processing is carried out on the emission signal by the pre-equalizer and then the emission signal is sent out. Compared with a traditional interference elimination method, the interference elimination method is capable of simplifying work of the interference elimination self-adapting filter and effectively eliminating broadband self-interference signals.

The invention discloses a controllable electromagnetic mixed coupling coaxial cavity filter, comprising a conductor housing with two or more resonant cavities opened inside, the top of which is sealed by a conductor cover board and which is provided with a through hole; an input/output device penetrates through the through hole on the conductor hosing; bottoms of two or more conductor resonators are fixed to the conductor housing in contact with the guide housing to form short circuit; the conductor cover board opposite to the tope of the conductor resonator is provided with a tuning screw; an electromagnetic mixed coupling control component is arranged between two adjacent guide resonators which need electromagnetic mixed coupling. The invention accomplishes elliptic filter characteristic with a coaxial cavity filter only with main coupling path, which is provided with the following advantage of small volume, low cost, little insertion loss and nonsymmetrical response.

A digital signal processing system for multiplexing/demultiplexing a large number of closely spaced FDM channels in which sub-band definition filtering divides the FDM spectral band comprised of "N" channels into "K" sub-bands in order to reduce the dimension of the polyphase filter fast Fourier transform structure required to complete the multiplexing/demultiplexing. This reduces the order of the required prototype filter by a factor proportional to K. The number of sub-bands K is chosen so that it is large enough to ensure the polyphase filter, fast Fourier transform structure for each sub-band is realizable within a finite word length, fixed point arithmetic implementation compatible with a low power consumption. To facilitate efficient sub-band definition filtering, the real basebanded composite signal is inputted at a spectral offset from DC equal to one quarter the FDM channel bandwidth for the N channels and the signal is sampled at a frequency 50% greater than the applicable Nyquist rate. The quarter band spectral offset and oversampling by 50% above the theoretical Nyquist rate facilitate the use of computationally efficient bandshift and symmetric half-band Finite Impulse Response (FIR) filtering.

A thermochromic, thermotropic, or thermoreflective filter relies on a mismatch between the index of refraction of a thermotropic material (e.g., a liquid crystal) and a substrate material that includes refractive or diffractive features. At colder operating temperatures, the refraction mismatches are eliminated or minimized such that the filter becomes transparent, whereas at high operating temperatures the refraction mismatches are increased such that for light at appropriate incidence angles, the structure becomes highly reflective. This filter has particular but not exclusive application as a temperature-controlled “smart mirror” for use in windows, walls, roofing, and other building materials.

A server (120) uses a password (π) to construct a multiplicative group (Z_N*) with a (hidden) smooth order subgroup (<x′>), where the group order (P_π) depends on the password. The client (110) uses its knowledge of the password to generate a root extraction problem instance (z) in the group and to generate data (y) allowing the server to construct a discrete logarithm problem instance (y′) in the subgroup. The server uses its knowledge of the group order to solve the root extraction problem, and solves the discrete logarithm problem efficiently by leveraging the smoothness of the subgroup. A shared key (sk) can be computed as a function of the solutions to the discrete logarithm and root extraction problem instances. In some embodiments, in an oblivious transfer protocol, the server queries the client (at 230) for data whose position in a database (210) is defined by the password. The client provides (240) such data without knowing the data position associated with the server's query. The client obtains the data position independently from the password. The data positions and/or the respective data are used for authentication and shared secret key generation. Other embodiments are also provided.

Reading light (26) is phase-modulated by a phase-modulating spatial light modulator (12), the phase-modulated reading light (26) is Fourier-transformed, and an image of the Fourier-transformed reading light is focused on an output plane (24) to form an optical pattern. In this method, 0-order light in the phase-modulated reading light (26) is blurred on the output plane (24). As the 0-order light is blurred, the luminance of the 0-order light is reduced on the output plane (24). Since the 0-order light is not blocked, the shape of the optical pattern is not limited.

This invention discloses one laser radar signal process method based on experience, which aims for laser radar signal and experience module analysis and combines small wave exchange theory and statistic test theory; using central limit theory and Late rules to test the random of the signal intensity; testing signal inverse part to keep analysis method without experience with remaining part using experience analysis method.

The invention discloses a blind identification method for punctured convolutional codes with a code rate of (n-1)/n. A mathematical model v(D)=m(D)G(D) for blind identification of the punctured convolutional codes is established at first, wherein, v(D) represents code output sequence; m(D) represents information sequence waiting for coding; G(D) represents generator polynomial matrix; on the ground that the code output sequence v(D), the generator polynomial matrix G(D) and a check polynomial matrix H(D) meet relational expressions G(D)H(D)<T>=0 and v(D)H(D)<T>=m(D)G(D)H(D)<T>=0, the check polynomial matrix H(D) is estimated by the v(D) at first and then the generator polynomial matrix G(D) is estimated, and finally the received code output sequence v(D) is combined and the information sequence m(D) is recovered. The blind identification method for the punctured convolutional codes with a code rate of (n-1)/n can identify the punctured convolutional codes more simply and more quickly and simultaneously solve the problem that initial place values of code words of the convolutional codes are fuzzy.

The invention discloses a cavity filter. The cavity filer comprises a metal cavity and a metal cover plate which is positioned on the metal cavity, wherein the metal cavity comprises at least eight resonance cavities which are coupled in sequence; a resonance rod is arranged in each resonance cavity; and the resonance rods in the first and the last resonance cavities are connected with an input signal connector and an output signal connector respectively. The coupling between the adjacent resonance cavities is magnetic coupling; coupling windows and coupling rods are arranged between the corresponding resonance cavities on the left and right sides of a passband; four places of crossed coupling is introduced, so that two transmission zero points can be generated on the left and right sides of the passband respectively, and higher out-of-band rejection can be achieved; the outline dimension of the overall filter cavity is not changed; the order of the filter is not increased, and the size of the filter is not enlarged; meanwhile, the cavity filter is easy to process and debug, and low in cost; and the large-batch production of the cavity filter can be achieved.

The invention provides a liquid scintillator detector n/gamma ray screening method based on a support vector machine. The method includes the following steps that firstly, signals are collected, the signals generated by a neutron source are collected through a liquid scintillator detector, and the collected signals are transformed into pulse signals; secondly, neutrons and gamma rays are screened through a charge comparison method, the pulse signals obtained in the first step are screened through a traditional charge comparison method, and the lower limit of the screening energy of the neutrons and the gamma rays of the charge comparison method is determined; thirdly, an M matrix is obtained; fourthly, LIBSVM software is used for conducting classification forecasting on the neutrons and the gamma rays. The liquid scintillator detector n/gamma ray screening method can distinguish signals with energy below a screening threshold value in the traditional method, and therefore the accuracy of neutron flux measuring is easily improved.

The invention provides a element two-stage partition and twice polycondensation parallel method based on multiple document flows. The method includes the steps of firstly, dividing a finite element model into a plurality of initial sub-areas, and saving model information of each initial sub-area independently in a document; secondly, by each progress, simultaneously and independently forming a system equation of each sub-area, and performing polycondensation to remove internal freedom degree of each system equation; thirdly, by a local main process, forming packaging sub-area system equations, and performing polycondensation to remove internal freedom degree of each packaging sub-area system equation; fourthly, by the local main process, solving an interface equation, and solving the internal freedom degree of each packaging sub-area system equation by means of back substitution; fifthly, solving internal freedom degree of each initial sub-area according to results of the top packaging sub-areas by means of back substitution; terminating if iteration ends, or else starting again from the second step. On the basis of realizing distributed data storage, large-scale finite element parallel computing efficiency is increased by fully utilizing structural features of large-scale parallel computer systems by means of maximally realizing communication localization.

The invention discloses a lithium iron phosphate battery rest electric quantity estimation method based on a closed-loop hybrid algorithm. The estimation method is a rest electric quantity estimation hybrid algorithm based on two kinds of closed algorithms in an electric automobile battery platform period. According to open circuit voltage change features of a lithium iron phosphate battery, a work interval of the battery is divided into a platform period and a non-platform period; when a battery initial value is in the non-platform period, the particle filtering is used for performing rest electric quantity estimation; when the initial value is in the platform period, firstly, the boundless Kalman filtering is used for tracking to a position near a truth value; then, the particle filtering is used for estimation. In the platform period, the particle filtering and the boundless Kalman filtering are combined; firstly, the boundless Kalman filtering is used for tracking a rest electric quantity initial value to obtain a value similar to the rest electric quantity true value, and then, the particle filtering is used for rest electric quantity estimation; an accurate and high-robustness result is obtained as much as possible.

The invention discloses a dynamic equivalence method for large-scale photovoltaic power station grid connection, and belongs to the technical field of electric system control. The method comprises the steps of firstly, calculating the equivalent and uniform input illumination intensity of each grid-connected photovoltaic power generation unit under the non-uniform illumination condition, then, grouping the grid-connected photovoltaic power generation units according to the equivalent and uniform input illumination intensity, aggregating the grid-connected photovoltaic power generation units in the same group into one grid-connected power generation equivalence unit, and finally calculating the equivalent input illumination intensity of each equivalence unit. According to the dynamic equivalence method for large-scale photovoltaic power station grid connection, the dynamic equivalence problem of the large-scale photovoltaic power station grid connection is solved, the number of orders of a model is remarkably reduced, the simulation time is shortened, and meanwhile the influence of a photovoltaic power station on a system can be correctly reflected.