2 results about "Characteristic ratio" patented technology

This invention discloses a method for constructing ternary entangled polymer mixtures of homopolymer-homogene-diblock copolymers using dissipative particle dynamics. The steps are as follows: obtaining the characteristic ratios and equilibrium bond lengths of the simulation system, and generating a series of homopolymers and diblock copolymers with bond lengths as step sizes; placing the obtained series of randomly walking homopolymers and copolymers into a simulation box according to the chain length, chain number, and number density of the simulation system; introducing interaction potentials between particles, using a harmonic spring potential to introduce bonding interaction potentials and a bending potential function to introduce bond angle interaction potentials; gradually increasing the repulsion parameter, ensuring that the difference in repulsion parameter between each stage remains equal or approximately equal; setting the repulsion parameter as the final value; and detecting whether the chain conformation is in equilibrium. The ternary entangled polymer mixture constructed by this invention can accurately describe the dynamics and rheological properties of entangled polymer blends and can be used to study the structure and rheological properties of entangled polymer interfaces.

The application discloses a method for identifying the source of crude oil organic matter and a chart thereof. The method comprises the following steps: separating an aromatic hydrocarbon component from a sample; obtaining a characteristic ratio for characterizing dimethylphenanthrene isomer distribution by gas chromatography-mass spectrometry, and the ratio is denoted as R value; determining the carbon isotope value of 1,7-DMP by gas chromatography-isotope ratio mass spectrometry, and calculating the logarithm value with 2 as the base, and the value is denoted as L value; constructing a two-dimensional identification chart by using the R value and the L value of standard samples with known sources; and finally, projecting the measured value of the sample to be measured into the chart, and identifying the source type of the parent material according to the region where the sample falls. The stable carbon isotope information and the molecular distribution information of 1,7-DMP are combined, the defects that the traditional biomarkers are interfered by thermal maturity and biodegradation are effectively overcome, different organic parent materials such as aquatic algae, angiosperms, herbaceous plants and gymnosperms can be finely distinguished, and a reliable technical means is provided for oil-source correlation under complex geological conditions.