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filters
To purify liquids from suspended (or emulsified) substances, one can use filtration through natural filters - fissured and/or cracked rocks with a high sorption capacity and permeability.
      
A kinetic scheme for the process consists of the liquid-phase oxidation of Hg by O3molecules and OH radicals followed by the adsorption of liquid-phase oxidation products on soot particles, which are removed from the gas flow using filters.
      
The calorimetric spectrometer comprises two calorimeters and a set of low-pass filters.
      
Frequency responses of the filters were measured experimentally and calculated with the help of a three-dimensional version of the KARAT computer code.
      
X-ray and magnetic filters helped measure light-gas spectra under the given conditions.
      
The system is composed of a nitrogen laser, neutral filters (7 stages of the laser-signal attenuation), and a set of laser-radiation distributors among the quartz fibers transmitting the light towards the scintillator tiles.
      
The detector is a telescope of three two-coordinate planes with two 1-mm-thick iron filters inserted between them.
      
Radiation of a given energy is selected with the help of multilayer X-ray mirrors in combination with special X-ray filters.
      
Blocks of filters that realize fast computational algorithms are constructed.
      
A step attenuator composed of gray filters and X-ray energy sensors were used in the measurements.
      
The calibration methods used in the experiments and results from absolute calibrations of crystals, X-ray photographic films, and filters are presented.
      
The spatial structure and the spectral distribution of X rays emitted by the plasma have been investigated with the use of a three-channel pinhole camera and a set of absorbing filters.
      
Two methods of signal smoothing were considered: square-wave (moving average) and triangular (weighted average) filters.
      
It was found that smoothing by these two filters did not distort noticeably the signal shape and the linearity of calibration plots.
      
The sorption of molybdoarsenic heteropoly acid (MAA) and its ion pair with tri-n-octylamine (TOA) on sorbents of different nature and hydrophobic filters has been studied.
      
Conditions of the quantitative extraction of MAA in the presence of TOA on thin-layer cellulose triacetate filters are found.
      
Palladium was determined on filters by diffuse reflectance spectrometry with the calculation of chromaticity characteristics and by a test scale.
      
Conditions of the quantitative extraction of Co, Cu, Fe(III), Ni, Pb, V(IV), and Zn from solutions on cellulose filters in the form of pyrrolidinedithiocarbamates obtained in flow were found.
      
The elements were determined on filters by X-ray fluorescence spectrometry.
      
It was shown that air can be sampled using 0.0025 M H2SO4 and blue ribbon paper filters.
      
 

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