Results 301 to 310 of about 93,146 (338)
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Ionization and sorption of fomesafen and atrazine by soils and soil constituents
Pesticide Science, 1993AbstractFomesafen exhibited weakly acidic properties and was titrated spectrophotometrically and determined to have a pKAof 3.0. [14C]fomesafen and [14C]atrazine, as references, were used in slurry‐type sorption studies with H+‐ and Ca2+‐saturated soil organic matter, Ca2+‐saturated montmorillonite clay, Norfolk sandy loan (Typic Paleudult) and Drummer
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Comparison of circuit models for the simulation of soil ionization
2012 International Conference on Lightning Protection (ICLP), 2012The main characteristic of the transient behaviour of a grounding system is the decrease of the soil resistivity and consequently of the grounding impedance, due to soil ionization phenomena that take place, when the density of the injected current exceeds a critical value.
E. P. Nicolopoulou +3 more
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Sorption of ionizable organic compounds on HDTMA-modified loess soil
Science of The Total Environment, 2004A natural loess soil was modified using a cationic surfactant, hexadecyltrimethylammonium (HDTMA) bromide. Sorption of ionizable organic compounds (IOCs), 2,4-dichlorophenol (DCP), p-nitroaniline (NA) and benzoic acid (BA), on the modified soil was determined under different pH conditions.
Hui, Chen +4 more
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Influence of soil pH on the sorption of ionizable chemicals: Modeling advances
Environmental Toxicology and Chemistry, 2009Abstract The soil–water distribution coefficient of ionizable chemicals (Kd) depends on the soil acidity, mainly because the pH governs speciation. Using pH-specific Kd values normalized to organic carbon (KOC) from the literature, a method was developed to estimate the KOC of monovalent organic acids and bases.
Antonio, Franco +2 more
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Electro-Filtering Spray Ionization Source for Soil Analysis
Analytical Letters, 2015ABSTRACTAn electro-filtering spray ionization source for ambient mass spectrometry is reported. The ion source was assembled with a conical metal filter with a paper cone. The performance of the new ion source was characterized by the analysis of soil. Soil was directly introduced into the filter-paper cone and solvent was added.
Yinjuan Chen +8 more
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RESPIRATION OF SOIL STERILIZED BY IONIZING RADIATIONS
Soil Science, 1962Electron- and x-ray-sterilized soil respires at a rate approaching that of nonsterile soil. Mercuric chloride decreases respiration of sterile soil, whereas incubating nonsterile soil with glucose for 48 hours prior to sterilizing with x rays increases subsequent respiration.
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Characterization of Ionization Phenomena in Soils Under Fast Impulses
IEEE Transactions on Power Delivery, 2006Protective devices such as spark gaps and surge arresters are used to divert surges to earth. It is, therefore, necessary that earthing systems are designed with a low-magnitude earth impedance value so that the overvoltage protection devices can divert high fault currents effectively to earth for all types of fault. Power frequency characterization of
Nor, N.M., Haddad, A., Griffiths, H.
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Dense interstellar clouds and ionization of the atmosphere and soil of mars
Solar System Research, 2011Using the standard GEANT4 code, we calculated the ionization rate of the Mars atmosphere and the dose absorbed by the planet’s soil caused by the galactic cosmic rays and the anomalous cosmic ray component in the heliosphere. Cases of the solar system passing through dense molecular clouds leading to an increase of the energetic particle flux at the ...
A. K. Pavlov +2 more
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FDTD simulation of grounding electrodes considering soil ionization
2012 International Conference on Lightning Protection (ICLP), 2012If an impulse or surge high current flows in a grounding electrode, the soil in the vicinity of the grounding electrode would be ionized and the voltage generated at the top of the grounding electrode would be reduced. Recently, Ala et al. (2008) have proposed a soil ionization model, on the basis of the dynamic soil-resistivity model of Liew and ...
Ken Otani +5 more
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Soil ionization effects on surge characteristics of grounding electrodes
IEEJ Transactions on Electrical and Electronic Engineering, 2019For finite‐difference time‐domain (FDTD) simulations, Ala et al. (2008) proposed a simplified engineering soil ionization model on the basis of the dynamic soil‐resistivity model of Liew and Darveniza (1974), and tested its validity against experiments on a 0.61‐m single vertical grounding conductor.
Fan Zhang +3 more
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