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8332 results about "Particle-size distribution" patented technology

The particle-size distribution (PSD) of a powder, or granular material, or particles dispersed in fluid, is a list of values or a mathematical function that defines the relative amount, typically by mass, of particles present according to size. Significant energy is usually required to disintegrate soil, etc. particles into the PSD that is then called a grain size distribution.

Intra-serum and intra-gel for modeling human skin tissue

The invention provides a class of samples that model the human body. This family of samples is based upon emulsions of oil in water with lecithin acting as the emulsifier. These solutions that have varying particle sizes may be spiked with basis set components (albumin, urea and glucose) to simulate skin tissues further. The family of samples is such that other organic compounds such as collagen, elastin, globulin and bilirubin may be added, as can salts such as Na+, K+ and Cl-. Layers of varying thickness with known index of refraction and particle size distributions may be generated using simple crosslinking reagents, such as collagen (gelatin). The resulting samples are flexible in each analyte's concentration and match the skin layers of the body in terms of the samples reduced scattering and absorption coefficients, mums and muma. This family of samples is provided for use in the medical field where lasers and spectroscopy based analyzers are used in treatment of the body. In particular, knowledge may be gained on net analyte signal, photon depth of penetration, photon radial diffusion, photon interaction between tissue layers, photon density (all as a function of frequency) and on instrument parameter specifications such as resolution and required dynamic range (A/D bits required). In particular, applications to delineate such parameters have been developed for the application of noninvasive glucose determination in the near-IR region from 700 to 2500 nm with an emphasis on the region 1000 to 2500 nm (10,000 to 4,000 cm-1).

Support of olefinic polymerization catalyst and preparation method thereof, solid catalyst components for olefinic polymerization and olefinic polymerization catalyst

The invention relates to a support of an olefinic polymerization catalyst and a preparation method thereof, solid catalyst components for olefinic polymerization and an olefinic polymerization catalyst. The support of the olefinic polymerization catalyst is dialkoxy magnesium. The preparation method of the support of the olefinic polymerization catalyst comprises the following steps: in an inert gas protective atmosphere, reacting magnesium and alcohol, which serve as raw materials, in the presence of a halogenating agent under reflux to prepare the dialkoxy magnesium, wherein the weight ratio of alcohol to magnesium is (4-50):1; the halogenating agent is at least one of halogen simple substances and halides, and the mol ratio of halogen atom to magnesium is (0.0002-0.2):1; and the dialkoxy magnesium is spherical particles of which the average particle size is 10-150 um and the particle size distribution index SPAN is smaller than 1.1. The olefinic polymerization catalyst prepared by the support has high activity, and the polymer has the advantages of high bulk density, good particle shape and uniform distribution; and thus, the olefinic polymerization catalyst is suitable for producing propylene homopolymer and copolymer.
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