3 results about "Concentration factor" patented technology

The invention discloses a shrinking model for developing and characterizing a biological agent freezing and thawing process and application of the shrinking model, the volume of the shrinking model is 100-1000mL, when the shrinking model is vertically placed, the ratio of the sectional area value of the maximum section in the horizontal direction to the length value in the vertical direction is (1-10): 1, the amount of a biological agent is 20-80% of the volume of the shrinking model, and the amount of the biological agent is 10-20% of the volume of the shrinking model. And the ratio of the sectional area value of the maximum section to the liquid level height value is (1-15): 1. After the biological agent is loaded into the reduced model, transferring into a refrigerator from room temperature, after complete freezing, taking out, thawing at room temperature, testing freeze concentration factors, and recording ice-water interface coexistence duration. According to the shrinking model, the freezing concentration factor is compared with the freezing concentration factor for comparison in the large-volume freezing and thawing process, the shrinking model with the freezing concentration factor larger than or similar to the freezing concentration factor for comparison is obtained, and the ice-water interface coexistence time is not shorter than that of a large-volume container due to multiple rounds of freezing and thawing; the method is used for subsequent biological agent freeze thawing process development and characterization. The small model is small in biological agent dosage, temperature control equipment does not need to be used, and the research and development cost can be greatly reduced.

This invention belongs to the field of aircraft structural performance evaluation technology, specifically involving a method for determining the allowable stress for durability design of aircraft metal structures. First, the baseline local allowable stress is calculated under a given material and load spectrum using fatigue analysis. Considering actual structural factors, an equivalent stress concentration factor is introduced to correct the baseline local allowable stress. Furthermore, a stress correction factor is introduced based on the correction of theoretical analysis results using fatigue tests. Considering reliability requirements, a fatigue uncertainty factor is also introduced, thereby establishing a set of analogous calculation formulas to determine the allowable stress for durability design. The calculation formula is: where, [σ max,0 [K] is the reference local allowable stress. te C is the equivalent stress concentration factor, SCF is the stress correction factor, FSF is the fatigue uncertainty factor, and C is the stress concentration factor. load This is the load conversion factor. This invention simplifies the fatigue test matrix while ensuring the accuracy of theoretical analysis; it can quickly determine whether the structural fatigue margin meets the requirements, thus enabling durability analysis to cover the entire load-bearing structure of the aircraft.

Provided is a concentration device for concentrating a test body fluid, capable of obtaining a test body fluid concentrate at a desired concentration factor, a test body fluid concentration method using the concentration device, a test body fluid inspection method using the test body fluid concentration method, and a test kit provided with the concentration device. A concentration device for concentrating a test body fluid that is an aqueous solution containing a high molecule, includes a cylinder that contains a particulate superabsorbent polymer and a piston that can be inserted into the cylinder, the cylinder has a liquid holding portion for holding a portion of the test body fluid injected into the cylinder at a bottom portion, the superabsorbent polymer is contained in the cylinder in contact with the liquid holding portion above the liquid holding portion, and the piston has a front end portion having a smaller pore size than the particle size of the superabsorbent polymer after water absorption.