5 results about "Aerodynamic diameter" patented technology

The invention discloses an on-line automatic pollen monitoring system and method, and relates to the technical field of environment detection, and the method comprises the steps: separating charged particles according to an aerodynamic diameter through an inertial impact effect, and collecting pollen particles in a target particle size range to the surface of a carrier tape; applying an electrostatic field to the carrier band to enable the surface of the carrier band to have charges with polarity opposite to the known polarity, and purging the carrier band by utilizing directional airflow to remove impurity particles which are not adsorbed; carrying out electrostatic neutralization treatment on the purified pollen particles, blowing the neutralized pollen particles from the surface of the carrier band into a detection channel by adopting pulse gas, and collecting corresponding light resistance pulse signals and multi-wavelength light scattering signals generated when the pollen particles pass through; and processing the light resistance pulse signal, extracting a dynamic characteristic sequence of the light resistance pulse signal along with time change, and judging whether the pollen particles are effective pollen particles or not based on particle physical characteristics reflected by the dynamic characteristic sequence.

The application provides a method for tracing air pollutants by using bubbles with different sizes and densities, comprising the following steps: determining a target density value of a tracing bubble according to the density of a gaseous pollutant to be traced, or determining the target density value of the tracing bubble according to the aerodynamic diameter of a solid particle-shaped and droplet-form pollutant to be traced; preparing the tracing bubble with the target density value, and releasing the tracing bubble in air of a test area; collecting position information of the tracing bubble in the test area; and determining a motion direction, a motion trajectory and a motion speed of the tracing bubble in the test area according to the position information. The method for tracing air pollutants by using bubbles with different sizes and densities solves the problem of tracing particulate matters and gaseous pollutants carried in air.

This invention belongs to the field of pharmaceutical powder formulations, and relates to an itraconazole inhalation dry powder, its preparation method, and its application. The preparation involves preparing itraconazole cocrystals via solvent evaporation, then forming a cocrystal nano-suspension through media milling. The nano-suspension is mixed with an excipient and then spray-dried to prepare the dry powder. The dry powder composition of this invention has spherical particles with an aerodynamic diameter of less than 4 μm. It exhibits an air displacement rate greater than 90%, a fine particle fraction greater than 40%, rapid dispersion after in vitro atomization, and good localization effect in the lungs in vivo.

Disclosed herein is a method of preparing an atomized droplet. Provided herein is a device having an acoustic wave interaction surface provided with an array of cavities, the array of cavities opening toward the acoustic wave interaction surface. The acoustic wave transducer generates and propagates acoustic waves to the acoustic wave interaction surface. Atomized liquid is contained in the cavity. The acoustic wave transducer is operated at a first input power to produce atomized droplets having a first aerosol particle size distribution. The acoustic wave transducer is operated at a second input power greater than the first input power to produce atomized droplets having a second aerosol particle size distribution having a mass median aerodynamic diameter (MMAD) greater than the mass median aerodynamic diameter of the first aerosol particle size distribution.

A method for determining airborne concentrations of an ensemble of particulate matter below the size fraction 2.5 μm in aerodynamic diameter (PM2.5). The method is to be composed of a sharp cut PM2.5 cyclone, optical sensor capable of producing scattering coefficients dependent on particle size, temperature and humidity sensors for adapting to changes in the environment, and a processing system for applying logic-based algorithm to convert raw sensor values into PM concentrations. The optical sensor is a dual wavelength integrating nephelometer capable of yielding particle characteristic scattering coefficients at two wavelengths. The particle scattering ratios between two wavelengths are used in conjunction with temperature and humidity in the method's algorithm to reduce particle growth bias and to ultimately yield PM2.5 concentrations.