6 results about "Sedimentation coefficient" patented technology

Methods of characterizing a preparation of biomolecules are provided. In some examples, methods of characterizing a preparation of viral particles are provided, including subjecting the preparation of viral particles to analytical ultracentrifugation under sedimentation velocity conditions, measuring sedimentation of the viral particles at a plurality of time points, determining a frictional ratio function c(s,ff0) and a sedimentation coefficient for the preparation of viral particles, plotting the c(s,ff0) versus the sedimentation coefficient(S) to obtain a c(s,ff0) distribution, and characterizing the presence and / or relative composition of viral particles comprising full viral genomes, partial viral genomes, overpackaged viral genomes, and / or empty viral particles in the preparation of viral particles.

1. The name of the design product: high-speed centrifuge. 2. The use of the design product: the design product is used for separating and concentrating the particles in the suspension, i.e. using strong centrifugal force to separate and concentrate the particles in the suspension with different physical properties (such as mass, buoyancy, sedimentation coefficient, etc.). 3. The design points of the design product: the combination of shape and pattern. 4. The picture or photo that best shows the design points: perspective view.

The invention provides a long-acting stable well completion test fluid. Compared with the prior art, the well completion fluid has the advantages that the micro-crosslinked polymer suspension stabilizer is used as a main agent, the structure of the micro-crosslinked polymer suspension stabilizer has good high-temperature stability, the overall molecular space structure is optimized based on the crosslinking capacity of Ca < 2 + >, the action strength with bentonite is improved, the capacity of suspending barite is improved, and the sedimentation stability of the well completion test fluid is guaranteed; the well completion test fluid with the density of 1.2-2.4 g / cm < 3 > and the temperature of 180-210 DEG C is formed, the rheological property and the filter loss are good after the well completion test fluid is aged after standing for 15 days at the temperature of 210 DEG C, the sedimentation coefficient is smaller than 0.520, and the well completion test fluid can fall to the bottom. The system meets the requirements of high-temperature deep well completion test operation on long-term high-temperature sedimentation stability, rheological property and the like, and has the advantages of simple preparation process, convenience in operation and the like.

The invention relates to the field of water-sediment multiphase fluid dynamics, in particular to a horizontal circular tube suspended sediment concentration distribution prediction method based on a dynamic settlement coefficient, and effectively solves the problem of insufficient prediction precision caused by neglecting a water-sediment dynamic slippage effect in a traditional suspended sediment diffusion equation by introducing the dynamic settlement coefficient. Through the technical path of key point characterization, dynamic coefficient calculation, source item correction and efficient solution, dynamic factors influencing settlement are successfully quantified and embedded into an efficient calculation framework, and finally the purpose of remarkably improving the horizontal circular tube suspended sediment concentration distribution prediction precision on the premise of keeping the calculation efficiency of a traditional method is achieved. According to the method, the requirement of actual engineering for rapid and accurate prediction of suspended sediment concentration distribution is met, the effect of collaborative optimization of precision and efficiency is finally obtained, and a more reliable and economical technical solution is provided for design and operation of horizontal circular pipe sand-containing water transportation engineering.

The application belongs to the technical field of optical measurement, and particularly relates to a multi-angle dynamic light scattering particle measurement method and an analysis system. The method comprises the following steps: S1, loading a sample to be measured and completing system initialization, and configuring space-time scanning basic parameters; S2, collecting scattering light intensity signals and light intensity autocorrelation functions corresponding to each space-time micro area to obtain original measurement data; S3, performing noise reduction and baseline correction preprocessing on the original measurement data, and analyzing to obtain apparent fluid dynamic particle diameters and average scattering light intensities of each space-time micro area, and constructing a data matrix in the space-time dimension; S4, taking dynamic light scattering theory and a sedimentation kinetics equation as double physical constraints, performing global fitting on full space-time dimension data to obtain a true particle size distribution and a sedimentation coefficient distribution after correction of sedimentation deviation; and S5, based on the true particle size and the sedimentation coefficient, and in combination with viscosity and density parameters of a dispersion medium, calculating to obtain particle effective density and a sample sedimentation stability index.

The invention relates to a continuous particle size distribution radionuclide intra-cloud and under-cloud wet deposition online coupling prediction method, system, equipment and medium, and the method comprises the following steps: if the current rainfall intensity is not zero, determining the continuous particle size distribution of different components of a radioactive aerosol to be analyzed based on observation data; calculating an in-cloud wet sedimentation coefficient and an under-cloud wet sedimentation coefficient by using a Rosell in-cloud sedimentation model and a Baklanov under-cloud sedimentation model respectively to obtain a wet sedimentation coefficient of the radioactive aerosol to be analyzed; if the current rainfall intensity is zero, setting the wet sedimentation coefficient of the radioactive aerosol to be analyzed to be 0; on the basis of the wet sedimentation coefficient, the nuclide concentration and the sedimentation result of the radioactive aerosol to be analyzed are obtained through calculation by means of a WRF-Chem model. The method can be widely applied to the technical field of core application.