Efficient biological activity detection method for cat interferon

The invention discloses an efficient biological activity detection method of cat interferon, and belongs to the technical field of biological activity detection of protein products. According to the method, a human interferon standard substance is adopted as a standard substance, CRFK cells are adopted as measuring cells, vesicular stomatitis virus is adopted as an attacking virus, and a novel calculation method is adopted, so that low biological activity caused by species specificity is avoided, a detection result conforms to an actual value, a system is stable, the situation that cytopathy is prone to falling off is effectively avoided, observation is easier, and the method is suitable for large-scale popularization and application. No matter from lesion observation, species specificity, a detection system or a calculation method, the method is superior to the method in the prior art, is more suitable for detecting the biological activity of the cat interferon, and is simpler, more convenient ...

Novel power grid stability evaluation method and device based on damping level

The invention discloses a novel power grid stability evaluation method and device based on damping level, and the method comprises the steps: obtaining the voltage of a common coupling point before and after the excitation is applied through applying external excitation to a novel power grid, and extracting a voltage response curve; and then the amplitude, oscillation frequency, attenuation factor and initial phase of the multiple oscillation modes in the response curve are identified based on a Prony algorithm, the damping ratio of each mode is calculated according to the identified parameters, the minimum damping ratio is selected to represent the damping level of the novel power grid, and the stability of the novel power grid is evaluated according to the damping level. According to the method, the specific structure and parameters of the novel power grid are not needed, the voltage response of the novel power grid is obtained by applying external excitation, the parameters of the response ...

Composite oligosaccharide plant growth stimulator and preparation method thereof

The invention relates to a composite oligosaccharide plant growth stimulator and a preparation method thereof, wherein the composite oligosaccharide plant growth stimulator comprises the following components and contents (calculated by weight percent): 1-5% of oligomerization chitosan, 1-5% of fructo oligosaccharide, 1-2% of oligomerization glucan, 10% of beer yeast hydrolysate, 0.5-1% of trace element, 10% of KH2PO4 and the balance of chicken manure water extract, which add up to 100%. The preparation method comprises the steps of: (1) preparing beer yeast hydrolysate; and (2) mixing the beer yeast hydrolysate obtained in the step (1) with oligomerization chitosan, fructo oligosaccharide, oligomerization glucan, trace element, KH2PO4 and chicken manure water extract according to the ratio, and obtaining the composite oligosaccharide plant growth stimulator. The invention is non-toxic, harmless and environmental friendly, can stimulate the growth and prematurity of plants, improve theyield ...

Portion of a display screen with animated graphical user interface

FPGA (field programmable gate array)-based ALC (automatic level control) system and method for ultra-short wave radio set

The invention relates to an FPGA (field programmable gate array)-based ALC (automatic level control) system and an FPGA-based ALC method for an ultra-short wave radio set. A transmission excitation signal is transmitted to a numerical control attenuator, and is subjected to the power amplification of a power amplification module, the amplitude of the excitation signal output by the power amplification module is detected by a directional coupler and a detector, the analogue signal is converted into a digital signal by an A/D (analogue/digital) converter, and the digital signal is transmitted to an FPGA. The FPGA is used for processing data to obtain an excitation signal amplitude average, i.e. a forward detection voltage value, by adopting a sliding window filtering algorithm, reading an ALC voltage reference value corresponding to a current working state from a memory according to current working frequency, comparing the forward detection voltage value and the ALC voltage reference value ...

Walnut oligopeptide powder, and preparation method and application thereof

The invention relates to walnut oligopeptide powder, and a preparation method and application thereof. The peptide content in the oligopeptide powder is 80wt% or above, and the molecular weight of 95%or more of walnut peptide is less than 1500 Dalton. The method comprises the following steps: extracting walnut proteins by using a high-efficiency countercurrent extraction method, performing filtering, performing enzymolysis, performing high-efficiency separation and purification on the obtained protein enzymatic hydrolysate through a microfiltration membrane and an ultrafiltration membrane insequence, and finally performing concentrating and spraying to obtain the oligopeptide powder. The walnut oligopeptide powder has the effects of improving sleep, protecting alcoholic fatty liver, inhibiting fat absorption, regulating the pH value of intestinal tracts to improve beneficial flora, and enhancing nutrient absorption.

FPGA (field programmable gate array) based digital AGC (automatic gain control) system and method of ultra-short wave radio set

The invention relates to a FPGA (field programmable gate array) based digital AGC (automatic gain control) system and method of an ultra-short wave radio set. An RF (radio frequency signal) IN of a receiver is sent to a digital attenuator I to achieve an IF (intermediate frequency) signal through a mixer. One part of the IF signal enters a digital attenuator II, and the other part of the IF signal enters a detector for the detection. An IF-RSSI (received signal strength indicator), received by the detector, is converted into a digital signal by an A/D (analog/digital) converter and entered the FPGA. The signal processing is performed to the FPGA by adopting the sliding window smoothing algorithm to acquire average value of the IF signal. The FPGA judges according to the IF-RSSI. The digital attenuator I and the digital attenuator II are controlled through RFAGC (radio frequency automatic gain control), IFAGC 1(intermediate frequency automatic gain control) and IFAGC2, and a variable gain ...

Special fixture for detecting surface roughness of knuckle

The invention provides a special fixture for detecting surface roughness of a knuckle. The special fixture comprises a central rotating plate, two lateral rotating plates and supports. A mandrel is fixedly connected on the central rotating plate, and the knuckle sleeves the mandrel which is connected with a pressing plate. A plurality of guide holes are formed in the central rotating plate, and one guide hole is connected with a brake caliper hole of the knuckle through a positioning rod in a matched manner. The two lateral rotating plates are disposed in parallel, perpendicular to the central rotating plate and symmetrically and fixedly connected on two sides of the central rotating plate, and each lateral rotating plate is rotationally mounted on one support. Through rotation in two directions, each finished surface of the knuckle can face upwards, and a roughmeter sensor is kept horizontal and matched with a roughmeter to realize detection of surface roughness of the knuckle complicated ...

Coaxiality detector for combined long-spaced shaft sleeve

The invention provides a coaxiality detector for a combined long-spaced shaft sleeve. The coaxiality detector comprises sliding end shafts, a reference rod and detection sliding sleeves, wherein two sliding end shafts are provided; the sliding end shafts comprise chamfered fitting portions and sliding pin portions; the two ends of the reference rod are provided with end stepped holes; two detection sliding sleeves are provided; the detection sliding sleeves have tubular structures provided with through holes; the through holes are sliding sleeve sliding holes; the sliding sleeve sliding holes are in clearance fit with the sliding pin portions of the sliding end shafts; the difference between the inner diameter of the shaft sleeve and the outer diameter of each detection sliding sleeve is smaller than a preset coaxiality standard value of the shaft sleeve. In the detector, the sliding end shafts and the reference rod are combined into a public axis, and inspection on whether the coaxiality ...

Device for press mounting of bolts

Provided is a device for press mounting of bolts. The device for press mounting of the bolts is used for achieving the purposes that bolts are automatically fed in the process that the bolts are pressed into a flange plate, and press mounting of all the bolts is accomplished continuously. The device for press mounting of the bolts comprises a press mounting workbench, a press mounting mechanism, an automatic bolt feeding mechanism, an automatic bolt supply mechanism and a PLC control system, wherein the press mounting mechanism is fixed to the press mounting workbench, the automatic bolt feeding mechanism is arranged on the side of the press mounting mechanism, and is arranged above the automatic bolt supply mechanism, a bolt storage container is arranged at one end of the automatic bolt supply mechanism, a bolt feeding frame is arranged at the other end of the automatic bolt supply mechanism, and the bolt feeding frame is fixed to the press mounting workbench. According to the device for ...

Automatic pig sleeving equipment for pig farm

The invention relates to the field of veterinary medicine, in particular to automatic pig sleeving equipment for a pig farm, which comprises a rack, a sleeving rope, a main shaft, a furling ring, a first rolling wheel and a winding column, and the furling ring synchronously rotates along with the main shaft; the multiple winding columns are installed on the folding ring, and the upper ends and the lower ends of the winding columns stretch out of the folding ring. The head end of the sleeve rope crosses the upper side of the furling ring to be connected with the main shaft, and the tail end crosses the lower side of the furling ring to be connected with the first rolling wheel; the main shaft drives a furling ring to rotate, so that the head end of a sleeve rope is wound at the upper ends of a plurality of winding columns, the sleeve ring is tightened to firmly sleeve the pig, and after the sleeve ring is completely attached to the pig body, the main shaft continues to rotate, so that the ...

Natural compound feed additive for reducing cholesterol in egg and preparation method thereof

The invention relates to a natural compound feed additive for reducing cholesterol in an egg, comprising the following components in parts by weight: 10-30 parts of oligomeric chitosan, 10-30 parts of oligomeric fructose, 3-10 parts of soybean oil foot extract in which the content of total soybean sterol is larger than 20%, 8-10 parts of honeysuckle extract in which the content of chlorogenic acid is 10% and 8-10 parts of Chinese goldthread rhizome extract in which the content of berberine is 20%, wherein the molecular weights of the oligomeric chitosan and the oligomeric fructose are respectively 1000-5000 and 2000-3000. A preparation method comprises the following steps: a, preparing the soybean oil foot extract; b, crushing the soybean oil foot extract obtained in the step a, the oligomeric chitosan, the oligomeric fructose, the honeysuckle extract and the Chinese goldthread rhizome extract, sieving the mixture with a 200-mesh sieve, and mixing uniformly in a certain proportion. In the ...

Slurry displacement process for screen pipe completed oil and gas well

The invention relates to the field of screen pipe completed horizontal wells of oil/gas wells, in particular to a slurry displacement process for a screen pipe completed oil and gas well. The process comprises the following steps of: displacing with a certain volume of reservoir protection liquid at the bottom of the well after a wellbore is drilled and before a screen pipe is descended; descending the screen pipe, wherein the reservoir protection liquid which is displaced for the first time is completely or partially squeezed to fill annular spaces of the wellbore and the screen pipe during the descending of the screen pipe; and displacing slurry in the screen pipe with the reservoir protection liquid by descending a drilling tool to the bottom of the well after the screen pipe is descended. By the process, the slurry inside and outside the screen pipe of a hydrocarbon reservoir section of the screen pipe completed well is completely displaced, a hydrocarbon reservoir is protected well ...