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37results about How to "Avoid memory effect" patented technology

Normalized leakage LMS self-adaptive mobile target detector based on FRFT

ActiveCN101984360AQuickly determine the optimal transformation orderAvoid memory effectWave based measurement systemsTime domainSignal-to-noise ratio (imaging)
The invention discloses a normalized leakage LMS self-adaptive mobile target detector based on FRFT, belonging to the technical field of radar signal processing and detecting. The existing statistics method and FRFT method are respectively applied to mobile target detection in sea clutter in the presence of the defects such as undesirable sea clutter inhibition, complex parameter evaluation and poor real-time. The invention combines the time domain LMS algorithm with the FRFT domain mobile target detection method, the kurtosis iterative computation is adopted for rapidly determining a best transform angle; an FRFT domain self-adaptive spectral line enhancer is constructed for improving the signal-to-noise ratio for inhibiting the sea clutter, the leakage factor is introduced into a weighting vector iterative formula for reducing the influence of memory effect to the spectral line enhancer, the step length is normalized in power for improving the convergence rate, and the amplitude value of output signal is regarded as the detection statistic. The detector can self-adaptively inhibit the sea clutter, and the target motion parameter evaluation is high in precision; and the detector is suitable for applying to the detection and filtration of LFM signal, and has popularization and application values.
Owner:NAVAL AVIATION UNIV

Anti-breaking foil device, 9μm~20μm copper foil post-processing anti-breaking foil method, post-processing machine

The invention discloses an anti-breaking foil device, a post-processing anti-breaking foil method for 9 μm to 20 μm copper foil, and a post-processing machine; it belongs to the technical field of electrolytic copper foil for power batteries of new energy vehicles; its technical points include: the thickness gauge component Include at least 4 thickness gauges, of which at least 2 thickness gauges are set on the left side of the copper foil, and at least 2 thickness gauges are set on the right side of the copper foil; the two thickness gauges distributed on one side of the copper foil are used for It is used to measure the copper foil thickness of the edge and the adjacent edge area; the thickness gauge assembly and the rotation angle sensor are connected to the control system; the control system is connected with the post-processing drive motor assembly; the thickness gauge assembly is arranged in the Between the reel and the first treatment tank. Using the anti-broken foil device, 9μm-20μm copper foil post-treatment anti-break foil method, and post-processing machine of the present application can maximize production efficiency on the premise of ensuring the post-processing safety of 9-20μm copper foil.
Owner:GUANGDONG FINE YUAN SCI TECH CO LTD

Bongkrekic acid high-selectivity enrichment solid-phase micro-extraction probe as well as preparation method and application thereof

The invention discloses a preparation method of a bongkrekic acid high-selectivity enrichment solid-phase micro-extraction probe. The preparation method comprises the following steps of: providing a solid substrate; carrying out surface modification on the solid substrate to enable the surface of the solid substrate to be rich in methacryloyloxy so as to obtain a surface modified solid substrate; and carrying out a molecular imprinting polymerization reaction on the surface modified solid substrate through a molecular imprinting technology by taking methacryloyloxyethyl trimethyl ammonium chloride and octadecyl methacrylate as functional monomers and vitamin A acid and (R)-12-hydroxy-cis-9-octadecenoic acid as template molecules to enable a molecularly imprinted coating with high selective adsorption capacity on bongkrekic acid to be attached to the surface of the solid substrate. The solid-phase micro-extraction probe disclosed by the invention can be used for efficiently extracting and enriching bongkrekic acid in complex food, the enrichment coefficient can reach thousands of times, and the detection limit can reach the level of [mu]g / L. The probe is simple to manufacture, low in price, disposable, capable of effectively preventing cross contamination and memory effect, and especially suitable for rapid analysis and detection of food safety.
Owner:INST OF ANALYSIS GUANGDONG ACAD OF SCI (CHINA NAT ANALYTICAL

A kind of hemt epitaxy structure and preparation method

The invention discloses an HEMT epitaxial structure, which structurally comprises a substrate (10), a low-temperature GaN buffer layer (20), an undoped GaN high-resistance layer (30), an AlN isolation layer (40), an undoped GaN channel layer (50), a barrier layer (60) with the Al content thereof to be changing in the stepped manner, and an AlN barrier layer (70). The undoped GaN high-resistance layer and the AlN isolation layer grow after the annealing treatment of the low-temperature GaN buffer layer. Compared with the carbon-doped manner or the iron-doped manner, the crystallization quality is effectively improved and the memory effect caused by ion doping is avoided. Meanwhile, the structure is provided with multiple channels, wherein two main channels are formed at the interfaces of an AlN barrier layer and an undoped GaN channel layer with the barrier layer with the Al content thereof to be changing in the stepped manner, and multiple auxiliary channels are formed at the interface of the barrier layer with the Al content thereof to be changing in the stepped manner. Compared with a conventional HEMT device, the current driving capability of the HEMT device is enhanced. The gate leakage current of the HEMT epitaxial structure and the leakage current of the buffer layer are small, and the current driving capability is strong. Therefore, the HEMT epitaxial structure can be applied to the field of high-power electronic devices. In addition, the invention further provides a preparation method of the HEMT epitaxial structure.
Owner:INST OF SEMICONDUCTORS - CHINESE ACAD OF SCI

Power system and control method of a range-extended pure electric vehicle

A power system of an extended-range pure electric vehicle, comprising: a power battery pack (1), an engine (4), a fuel tank (2) for supplying fuel to the engine (4), a generator (5) for converting kinetic energy of the engine into electric energy, a power distribution controller (8) and a drive motor (6) for driving the vehicle to run. The power battery pack (1), the generator (5) and the drive motor (6) are all electrically connected to the power distribution controller (8). Power supplied by the power battery pack (1) and the generator (5) is supplied to the drive motor (6) by means of the power distribution controller (8). When the power of the power battery pack (1) is insufficient, the engine (4) starts so as to drive the generator (5) to generate electricity, and supply the electric power generated by the motor (5) to the drive motor (6) and charge the power battery pack (1). The described system may charge a battery pack, distribute energy intelligently and carry out maintenance of the battery pack according to the driving situation of a vehicle, and may prolong the mileage of an electric vehicle and the service life of the battery pack. Also provided by the present invention is a control method for the power system of the extended-range pure electric vehicle.
Owner:JIANGSU HUAZI AUTO INDUSTRY CO LTD

Double-channel full-automatic intelligent rapid mercury vapormeter

A double-channel full-automatic intelligent rapid mercury vapormeter comprises an automatic sample introduction system, a double-channel system, an absorption cell system and a gas path system, wherein the automatic sample introduction system is connected with the double-channel system and used for inputting a sample boat containing a sample into the double-channel system through the automatic sample introduction system, the absorption cell system is connected with the double-channel system. The two-channel system pyrolyzes mercury in a sample into mercury elementary substance steam in a thermal cracking manner, the mercury elementary substance steam is input into the absorption cell system under the action of the gas path system, and the absorption cell system is used for detecting the absorbance of the mercury elementary substance steam in the absorption cell to a light intensity difference effect caused by characteristic spectral lines emitted by the mercury special light source. According to the double-channel full-automatic intelligent rapid mercury vapormeter, a double-channel sequential detection mode is utilized, and two sample results are measured at the same time through one-time testing, so that the sample testing time is greatly shortened, and the detection efficiency is improved.
Owner:BEIJING HAIGUANG INSTR
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