Air inlet manifold of engine

The invention provides an engine intake manifold, which comprises a plurality of air flues, a cavity resonator connected with the plurality of the air flues, a throttle valve air inlet arranged on the cavity resonator, and a cylinder head integrated flange connected with the other ends of the air flues, wherein the throttle valve air inlet is arranged at the middle part of the cavity resonator; the cavity resonator is a symmetric structure according to a central line a of the throttle valve air inlet; the air flues are bent to form a reverse q shape along a central axis b of the cavity resonator and cover the cavity resonator; and the air flues have the same length and are symmetrically distributed along the two sides of the central line a. The intake manifold adopting the structure can effectively improve the dynamic property, economical efficiency, NVH characteristic and emission property of an engine.

Primer group, probe and kit for detecting campylobacter jejuni PCR-ELISA and use method of kit

The invention relates to a primer group, probe and kit for detecting campylobacter jejuni PCR-ELISA and a use method of the kit. According to the invention, a campylobacter jejuni PCR-ELISA detection kit is established, and a primer and the probe are designed for the kit according to a campylobacter jejuni hipO gene conservative area. The hybridization probe is added in PCR-ELISA detection in comparison with simple PCR detection, so that the method can accurately detect target gene fragments in a sample, rather than simply detect the size of amplification product molecular weight, thereby increasing the detection specificity, and then the sample can be accurately identified through the method. The method adopts a streptomycin-avidin-digoxin-antidigoxin antibody system, and compared with the simple PCR and ELISA detection method, the detection method has the advantage that the sensitivity is improved due to the existence of double markers. The method adopts ELISA chromogenic reaction on ...

Colorimetric determination method of Sudan

High performance liquid chromatography method for determining related substances in nicardipine hydrochloride bulk drug

The invention provides a high performance liquid chromatography for determining related substances in a nicardipine hydrochloride bulk drug, which adopts a chromatographic column with octadecylsilane chemically bonded silica as a filler, adopts a mobile phase A consisting of 3.5 g/L sodium perchlorate monohydrate and a 1ml triethylamine-containing aqueous solution with the pH adjusted to 2.0 by perchloric acid and a mobile phase B consisting of acetonitrile-methanol (70: 30), gradient elution is carried out, and the content of the related substances in the nicardipine hydrochloride bulk drug is measured. According to the method, related substances including process impurities, forced degradation impurities and the like in the nicardipine hydrochloride raw material medicine can be effectively separated, a gradient elution method is adopted for analysis, and the method is good in reproducibility, high in specificity, high in sensitivity and easy and convenient to operate.

Loop-mediated isothermal amplication technology-based quick campylobacter jejunii detection kit and using method thereof

The invention discloses a loop-mediated isothermal amplication technology-based quick campylobacter jejunii detection kit and a using method thereof. The kit consists of (1) reaction solution, (2) a primer group, (3) sample pretreatment solution and (4) positive contrast solution, wherein the primer group is one of the following eight primer groups, and each primer group comprises a pair of primers, namely an internal primer and an external primer; and a calcein manganese complex is added in advance in the reaction, the manganese is combined with pyrophosphate radical ions separated by dNTP to release the calcein, the released calcein can be observed and identified by naked eyes, the positive result is yellow green, and the negative result is light yellow. The kit has the advantages of strong specificity, short reaction time, high sensitivity and the like.

High performance liquid chromatography method for determining related substances in alanyl glutamine bulk drug

The invention provides a high performance liquid chromatography method for determining related substances in an alanyl-glutamine bulk drug, which adopts a chromatographic column with octadecylsilane chemically bonded silica as a filler, can effectively separate the alanyl-glutamine related substances, including degradation impurities and process impurities, and has the advantages of high precision, high sensitivity, high accuracy and high sensitivity. The service life of the column is long, and the product quality of the alanyl-glutamine bulk drug can be better controlled.

Colorimetric determination method of Sudan

The invention provides a colorimetric determination method of Sudan. The method comprises the following steps: firstly determining the maximum absorption wavelength of a Sudan I-IV standard solution; preparing each standard solution into solutions of different concentrations; adding concentrated sulfuric acid dropwise to the prepared solutions, and measuring the absorbances of the solutions underthe corresponding maximum absorption wavelength so as to establish a standard equation for the absorbance and concentration of the Sudan standard solution; and dropping concentrated sulfuric acid to a sample solution to be measured so as to determine the type of the Sudan contained in the solution, measuring the absorbance of the sample solution under the corresponding maximum absorption wavelength, and calculating the Sudan concentration in the sample solution according to the standard equation so as to estimate the residual quantity of the Sudan according to relationship between the Sudan concentration ...

Hydraulic combined punching and shearing machine

The invention discloses a hydraulic combined punching and shearing machine, which consists of a machine seat, a die holder and an oil cylinder. An oil tank is arranged on the left lower part in a machine seat box, a hydraulic system is arranged above the oil tank, the right lower part of the oil tank is provided with a motor and a pump, the right upper part of the oil tank is provided with an electric appliance control system, the middle of the oil tank is provided with an oil cylinder, and an oil cylinder piston is connected with the lower end of a shear shank; a machine body is arranged above the machine seat, the shear shank is supported in the machine body by a rotary center, and the left top end of the shear shank is provided with a punching head; and the lower machine body is correspondingly provided with the die holder, the left side of the upper surface is provided with a transverse H-shaped steel shearing device, the right side is provided with an angle steel shearing device, the ...

Multi-reference frame rapid movement estimation method based on effective coverage

This invention discloses a multi-reference frame quick motion estimation method, which puts forward and verifies the assumption of motion continuity by researching the property of multi-reference frame motion estimation and puts forward motion effective zones in different reference frames, the searching points of the zones are far more smaller than those of total searching motion estimation, so as to greatly reduce the time complexity of motion estimation. This invention mainly puts forward a quick search strategy to integral pixel accuracy motion estimation to make the predicted searched zone a continuous one, so this method can combine with other methods for fraction pixel accuracy motion estimation.