36results about How to "Guaranteed linear relationship" patented technology

A modularized atomic energy microscope is disclosed, comprising seven modules. The first one is stepper motor the second is sample support with four-dimensional adjustment fixed on stepper motor, the third is z direction scanner, the fourth consists of microbracket needle point and focusing lens, the fifth is xy direction scanner, the sixth consists of semiconductor laser with focusing lens, reflector, imaging lens and four-quadrant photoelectric sensor, the seventh consists of optical microscope, CCD camera, monitor. The invention has convenient adjustment and replacement to modularized atomic energy microscope, and using each module to construct atomic energy microscope with different structure is easy and sample has function of coarse positioning.

The invention relates to method for identifying maize intercross species by using a molecular marker, which is characterized by comprising the following steps of: extracting the endosperm, leaf blade and parental leaf blade DNA of a maize intercross species to be inspected; developing an InDel marker and screening out a codominant marker among parents according to the sequence difference among parent genomes; analyzing the quality of amplification products of leaf blade DNA allelic genes of the intercross species to determine the molecular marker of the maize intercross species; searching the PCR exponential amplification phase of the marker, clearly expressing the cycle number of the amplification products on agarose gel, and amplifying the endosperm and leaf blade DNA of the intercross species in the same batch; quantitatively analyzing an electrophoretic band to obtain the measured value of relative amount of amplification products of leaf blade and endosperm allelic genes of the intercross species; obtaining the theoretical value of relative amount of amplification products of endosperm allelic genes according to the measured value of relative amount of amplification products of leaf blade allelic genes of the intercross species; and counting the measured value and the theoretical value of relative amount of amplification products of endosperm allelic genes of the intercross species to be inspected by using a Chi-square test, calculating the probability P, and judging the intercross species.

The invention discloses a power system of a flight test with power of a low-speed wind tunnel model. The power system comprises a wind tunnel test section, an aircraft model and a power system. The power system comprises a needle valve, a high pressure hose, a swivel joint, a plenum chamber and a nozzle. The needle valve is arranged outside the wind tunnel test section. One end of the high pressure hose is connected to the needle valve, and the other end of the high pressure hose is connected to the rotation end of the swivel joint. The fixed end of the swivel joint is fixed at the top of the aircraft model. The plenum chamber is arranged in the aircraft model and communicates with the swivel joint. The nozzle is arranged at the tail part of the aircraft model, and the inlet end of the nozzle communicates with the plenum chamber through a pipeline. According to the power system, the requirement of the flight test with power of the wind tunnel model can be satisfied, the power density provided by the power system is large, the response is fast, the occupied space is small, the power system can be installed in the aircraft model, the service life is long, and the aircraft model motion interference is small.

The invention discloses a distribution method of third-order intermodulation distortion parameters applied inside a receiver radio-frequency system circuit, which belongs to the technical field of electromagnetic compatibility. The distribution method comprises the following steps: firstly processing the overall receiving performance index of a receiver radio-frequency system according to nonparasitic response to obtain a threshold voltage; then computing the total distortion voltage of third-order intermodulation distortion in each level of sub circuit, which is about to enter a received passband according to constraint relation; and finally obtaining the third-order cut-off point of each level of sub circuit according to the relation that the total distortion voltage is smaller than and equal to the threshold voltage. The method of the invention realizes the distribution of the third-order intermodulation distortion parameters of each level of sub circuit under the condition of cascade circuit voltage signal in-phase, thereby the problem of poor communication quality caused by overlarge third-order intermodulation distortion signal interference of the receiver radio-frequency system is solved.

The invention discloses a fiber grating displacement meter. The displacement meter comprises anchor flukes, connecting pieces, elastic pieces, sensors, cantilever beams and a casing, wherein the casing is fixed to the bottom surface of a top plate; holes are formed in the top plate and go deep into a rock mass; the anchor flukes are fixed to the base points of the holes and are connected with the free ends of the cantilever beams through the connecting pieces and the elastic pieces; the other ends, which are opposite to the free ends, of the cantilever beams are fixed ends; the fixed ends are fixed on the casing; and the sensors are stuck to the cantilever beams. The displacement meter provided by the invention has a wide application range, can be applied to top plate sinkage monitoring for various tunnel projects and subway projects and can ensure measuring accuracy.