scholarly journals A new method for the estimation of sinking particle fluxes from measurements of the particle size distribution, average sinking velocity, and carbon content

2012 ◽  
Vol 10 (5) ◽  
pp. 329-346 ◽  
Author(s):  
Andrew M. P. McDonnell ◽  
Ken O. Buesseler
Keyword(s):  
Particle Size ◽  
Particle Size Distribution ◽  
Carbon Content ◽  
Size Distribution ◽  
New Method ◽  
Particle Fluxes ◽  
Sinking Velocity

scholarly journals ESTIMATION METHOD OF PARTICLE SIZE DISTRIBUTION (PSD) OF RADIOACTIVE AEROSOLS BY USING INERTIAL SEPARATORS

2018 ◽  
Vol 3 (3) ◽  
pp. 327
Author(s):  
Youesf Husein ◽  
Pripachkin Dmitry ◽  
Budyka Aleksandr ◽  
Karev Andrey ◽  
Tsovyanov Aleksandr
Keyword(s):  
Particle Size ◽  
Particle Size Distribution ◽  
Size Distribution ◽  
Aerosol Particles ◽  
Estimation Method ◽  
New Method ◽  
Radioactive Aerosols

This paper describes a new method for determining the dispersed composition of radioactive aerosols using device that containing inertial separators of aerosol particles which separating it into fractions by size.

scholarly journals A Method to Generate Experimental Aerosol with Similar Particle Size Distribution to Atmospheric Aerosol

Atmosphere ◽  
2021 ◽  
Vol 12 (12) ◽  
pp. 1669
Author(s):  
Jianlin Ren ◽  
Junjie He ◽  
Jiayu Li ◽  
Junjie Liu
Keyword(s):  
Particle Size ◽  
Particle Size Distribution ◽  
Olive Oil ◽  
Size Distribution ◽  
Atmospheric Aerosol ◽  
Sucrose Solution ◽  
Filtration Efficiency ◽  
Concentration Measurement ◽  
New Method ◽  
Wide Range

The SARS-CoV virus spreads in the atmosphere mainly in the form of aerosols. Particle air filters are widely used in indoor heating, ventilation, and air-conditioning (HVAC) systems and filtration equipment to reduce aerosol concentration and improve indoor air quality. Requirements arise to rate filters according to their mass-based filtration efficiency. The size distribution of test aerosol greatly affects the measurement results of mass-based filtration efficiency and dust loading of filters, as well as the calibration of optical instruments for fine-particle (PM2.5) mass concentration measurement. The main objective of this study was to find a new method to generate a chemically nontoxic aerosol with a similar particle size distribution to atmospheric aerosol. We measured the size distribution of aerosols generated by DEHS (di-ethyl-hexyl-sebacate), PSL (poly-styrene latex), olive oil, and 20% sucrose solution with a collision nebulizer in a wide range of 15 nm–20 μm. Individually, none of the solutions generated particles that share a similar size distribution to atmospheric aerosol. We found that the 20% sucrose solution + olive oil mixture solution (Vss:Voo = 1:2) could be used to generate a chemically nontoxic aerosol with similar particle number/volume size distribution to the atmospheric aerosol (t-test, p < 0.05). The differences in the mass-base filtration efficiency measured by the generated aerosol and the atmospheric aerosol were smaller than 2% for MERV 7, 10, 13, and 16 rated filters. The aerosol generated by the new method also performed well in the calibration of optical-principle-based PM2.5 concentration measurement instruments. The average relative difference measured by a tapered element oscillating microbalance (TEOM) and a Dusttrak Model 8530 (calibrated by aerosol generated by the new method) was smaller than 5.8% in the real-situation measurement.

scholarly journals PENENTUAN DISTRIBUSI UKURAN PARTIKEL TEPUNG TERIGU DENGAN MENGGUNAKAN METODE PENGAPUNGAN BATANG (BUOYANCY WEIGHING-BAR METHOD)

2015 ◽  
Vol 4 (1) ◽  
pp. 30-34
Author(s):  
Rondang Tambun ◽  
Nofriko Pratama ◽  
Ely ◽  
Farida Hanum
Keyword(s):  
Particle Size ◽  
Particle Size Distribution ◽  
Size Distribution ◽  
Wheat Flour ◽  
Laser Diffraction ◽  
Coulter Counter ◽  
Balance Method ◽  
Density Change ◽  
New Method ◽  
Diffraction Scattering

Particle size measurement of wheat flour is important in wheat flour industry. There are several methods have been used to measure particle size distribution (PSD) of wheat flour, such as Andreasen pipette method, sedimentation balance method, centrifugal sedimentation method. The disadvantages of these methods are that they are time consuming and require special skills. On the other hand, PSD can be analyzed using a different principle through laser diffraction/scattering methods, and coulter counter method. The laser diffraction/scattering and coulter counter methods produce highly accurate results within a shorter time, but the equipment is extremely expensive. Therefore, a simple and cost-effective new method to determine PSD is in high demand. In this study, we aim to develop a new method to measure the particle size distribution of wheat flour using a buoyancy weighing–bar method. In this method, the density change in a suspension due to particle migration (wheat flour) is measured by weighing buoyancy against a weighing–bar hung in the suspension (etanol/metanol), and the PSD is calculated using the length of the bar and the time–course change in the mass of the bar. This apparatus consists of an analytical balance with a hook for underfloor weighing, and a weighing–bar, which is used to detect the density change in suspension. The result obtained show that the PSD of wheat flour measured by the buoyancy weighing-bar method is comparable to that determined by settling balance method.

A new method for measuring the particle size distribution of aerosols

1980 ◽  
Vol 51 (4) ◽  
pp. 516-520 ◽  
Author(s):  
R. J. Tropp ◽  
P. J. Kuhn ◽  
J. R. Brock
Keyword(s):  
Particle Size ◽  
Particle Size Distribution ◽  
Size Distribution ◽  
New Method

A new method for environmental analysis of particle size distribution data from shoreline sediments

Nature ◽  
1984 ◽  
Vol 311 (5987) ◽  
pp. 648-651 ◽  
Author(s):  
N. R. J. Fieller ◽  
D. D. Gilbertson ◽  
W. Olbricht
Keyword(s):  
Particle Size ◽  
Particle Size Distribution ◽  
Size Distribution ◽  
Environmental Analysis ◽  
New Method ◽  
Distribution Data

A New Method for Measuring Particle Size Distribution of Radon Decay Products Using Imaging Plate

2005 ◽  
Vol 40 (2) ◽  
pp. 177-182 ◽  
Author(s):  
Fumihiro SAITO ◽  
Shinya FURUICHI ◽  
Naureen M. RARMAN ◽  
Takao IIDA ◽  
Jun KOARASHI
Keyword(s):  
Particle Size ◽  
Particle Size Distribution ◽  
Size Distribution ◽  
New Method ◽  
Imaging Plate ◽  
Decay Products ◽  
Radon Decay
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