4results about How to "Rapid characterization" patented technology

This disclosure provides a nuclear magnetic resonance (NMR) analysis method for establishing the chemical composition and condensed-state structure of fluorine-containing materials and its application. The method includes: placing fluorine-containing materials under different operating conditions in a single-sided NMR spectrometer; under a single-sided inhomogeneous magnetic field environment; presetting parameters for a spin echo pulse sequence; using the spin echo pulse sequence to excite fluorine and hydrogen nuclei in the fluorine-containing material to obtain coupled NMR signals of fluorine and hydrogen nuclei; determining echo peak data from the coupled NMR signals according to the preset parameters; processing the echo peak data according to the structural characteristics of the fluorine-containing material to obtain relaxation spectrum fingerprint data; performing data transformation on the relaxation spectrum fingerprint data to obtain transverse relaxation time data; and establishing a relaxation spectrum fingerprint database and a transverse relaxation time database of the coupling of fluorine and hydrogen nuclei in the fluorine-containing material based on the relaxation spectrum fingerprint data and transverse relaxation time data under different operating conditions.

The invention relates to the technical field of material detection, in particular to a rapid characterization method of an OCA light curing rate. According to the rapid characterization method for the light curing rate of the OCA, the light curing rate of the OCA can be dynamically monitored by testing the content and the change rate of the photoinitiator 651, the free radical quenching product benzophenone and the methyl benzoate in an OCA system and combining the conversion rate of monomers; in addition, a photocuring end point can be further obtained, and the optimal curing time is obtained. According to the method, by monitoring byproducts generated by free radical self-quenching, rapid and high-sensitivity characterization of the whole curing reaction process can be achieved, and the method does not need to use an organic solvent and is safe and environmentally friendly.

This invention provides a method for studying the effect of oxygen content on the microstructure and properties of nickel-based superalloys, comprising the following steps: S1, placing high-oxygen nickel-based recycled alloy powder into the first channel of a feeding hopper, and low-oxygen nickel-based alloy powder into the second channel of the feeding hopper; S2, activating the first feeding tray of the first channel and the second feeding tray of the second channel for continuous feeding, obtaining a layer-by-layer stacked mixed printing powder; S3, simultaneously activating the printing equipment to print layer by layer, obtaining a nickel-based superalloy sample with a gradient change in oxygen content; wherein, as the number of layers increases, the mass percentage of high-oxygen nickel-based recycled alloy powder gradually increases from 0% to 100%, and the mass percentage of low-oxygen nickel-based alloy powder gradually decreases from 100% to 0%. The gradient material with continuously changing oxygen content prepared by the method of this invention can provide prototype materials for high-throughput rapid characterization of the effect of oxygen content on the microstructure and properties of nickel-based superalloys.

The invention belongs to the technical field of engines, and particularly relates to a diesel engine in-cylinder heat release curve real-time reconstruction method based on injection parameter variation, which comprises the following steps of: extracting diesel engine structure, control and operation parameters from a steady-state engine characteristic database, determining a typical load working condition and obtaining a reference combustion heat release rate curve; the circulating air inflow is calculated based on the rotating speed of the diesel engine and the pressure of an air inlet main pipe, the in-cylinder excess air coefficient is calculated according to the current circulating air inflow and the oil injection amount, the injection duration and the combustion duration are calculated in combination with the rotating speed of the diesel engine, the injection pressure, the circulating oil injection amount and the excess air coefficient, and the reference combustion heat release rate is further calculated. And phase translation is carried out on the reconstructed combustion heat release rate curve according to the main injection advance angle, and a target combustion heat release rate curve consistent with the main injection moment is obtained. The method is small in calculation amount and high in reconstruction speed, can adapt to the influence of injection parameter change on the combustion heat release characteristic under the transient working condition, and meets the application requirements of real-time analysis and vehicle-mounted control.