Atomic Spectra Database

A271 TRANSPORT BY INTERMITTENCY IN THE BOUNDARY OF THE DIII-D TOKAMAK. Intermittent plasma objectives (IPOs) featuring higher pressure than the surrounding plasma, are responsible for {approx} 50% of the E x B{sub T} radial transport in the scrape off layer (SOL) of the DIII-D tokamak in L- and H-mode discharges. Conditional averaging reveals that the IPOs are positively charged and feature internal poloidal electric fields of up to 4000 V/m. The IPOs move radially with E x B{sub T}/B{sup 2} velocities of {approx} 2600 m/s near the last closed flux surface (LCFS), and {approx} 330 m/s near the wall. The IPOs slow down as they shrink in radial size from 4 cm at the LCFS to 0.5 cm near the wall. The skewness (i.e. asymmetry of fluctuations from the average) of probe and beam emission spectroscopy (BES) data indicate IPO formation at or near the LCFS and the existence of positive and negative IPOs which move in opposite directions. The particle content of the IPOs at the LCFS is linearly dependent on the local density and decays over {approx} 3 cm into the SOL while their temperature decays much faster ({approx} 1 cm).

/pdf/transport-by-intermittency-in-the-boundary-of-the-diii-d-4unr1kj0ia.pdf

Transport by intermittency in the boundary of the diii-d tokamak

Catalytic combustion is one of the most effective techniques for the removal of volatile organic compounds (VOCs).In this review,the recent developments in catalytic combustion of VOCs with regard to active species such as noble metal catalysts,mixed metal oxides,perovskite and spinel metal oxide phases were examined.The effects of particle sizes of active species,catalyst supports,the water vapor effect and the coking effect on catalytic combustion were evaluated.It is found that the research on noble metal catalysts mainly focuses on developing new supports and bi-elemental noble metal catalysts;while the research on non-noble metal catalysts focuses on developing new mixed metal oxides,perovskites and spinel catalysts,as well as investigating the effects of particle sizes and various supports on the combustion activity.Additionally,as far as practical application is concerned,the effect of water vapor and coking deactivation on the catalytic combustion process are discussed.This review will be helpful in choosing an appropriate technique for the removal of VOCs by catalytic combustion with high activity and high stability.

Recent Progress in the Removal of Volatile Organic Compounds by Catalytic Combustion

http://digital.csic.es/bitstream/10261/191476/1/improving_pollutant_removal_efficiency_packed-bed_plasma_reactors_ferroelectric.pdf

Improving the pollutant removal efficiency of packed-bed plasma reactors incorporating ferroelectric components

The molecular interactions between the polar systems isopropyl alcohol (IPA) and aniline for various mole fractions at different temperatures were studied by determining the dielectric permittivity using an HP-LF impedance analyzer at radio frequencies, the plunger method in the microwave frequency range and Abbe’s refractometer in optical region. Kirkwood effective correlation factors, corrective Kirkwood correlation factors, excess permittivities, Bruggeman parameters, excess Helmholtz free energy, relaxation time, dipole moment and excessive dipole moment were calculated using the experimental data. Optimized geometries were calculated using Spartan Modeling software for both pure and equimolar systems of isopropyl alcohol and aniline for Hamiltonian quantum mechanical calculations. Conformational analysis of the formation of hydrogen bond between the two systems is supported by the FT-IR spectra.

Dielectric and Thermodynamic Studies on the Hydrogen Bonded Binary System of Isopropyl Alcohol and Aniline

The densities (ρ) and ultrasonic velocities (C) of binary mixture of diisopropyl ether (DIPE) and bromobenzene (BB) have been measured at different frequencies (1 MHz, 3 MHz and 5 MHz) over the entire range of mole fraction of diisopropyl ether (DIPE) at temperature 303 K. The intermolecular free length (Lf), isentropic compressibility (β), acoustic impedance (Z) and excess values of isentropic compressibility (βE) and acoustic impedance (ZE) have been computed using values of ultrasonic velocity (C) and density (ρ).

Study of acoustic parameters of binary mixtures of a nonpolar liquid with polar liquid at different frequencies

The experimental density (ρ) and the velocity (U) for ternary mixture of dimethyl acetamide diethyl ether and isobutyl methyl ketone at different frequencies (2, 4, 6 and 8 MHZ) have been measured at a constant temperature of 308 K. These data have been used to compute acoustic impedance (Z), adiabatic compressibility (K s), intermolecular free length (Lf ), molar volume (Vm ), molar sound velocity (R), molar compressibility (B), available volume (V a), Lennard-Jones potential repulsive term exponent (n), relative association (R A), interaction parameter (X) and excess values of some of the above parameters for entire range of mole fraction and are interpreted to explain molecular interaction occurring in the liquid mixture.

Acoustical study on ternary mixture of dimethyl acetamide (DMAC) in diethyl ether and isobutyl methyl ketone at different frequencies

The densities (α) and ultrasonic velocities (C) of binary mixtures of a polar liquid like acetone and toluene have been measured at different frequencies (lMHz, 3MHz and 5MHz) over the entire range of mole fraction of acetone at temperature 303.16k. The intermolecular free length (L
 f
 ), isentropic compressibility (β), acoustic impedance (Z), excess values of isentropic compressibility (β
 E
 ) and acoustic impedance (Z
 E
 ) have been computed using values of ultrasonic velocity (C) and density (α). The ultrasonic velocity (C), intermolecular free length (L
 f
 ) and excess values of isentropic compressibility are positive whereas excess values of acoustic impedance is negative for the entire composition range which indicates the specific interaction between unlike molecules. The results are discussed in the light of intermolecular interactions occurring in the solutions.

Effect of frequency on acoustic parameters in a binary mixture of polar liquids

Chemical Modification of Natural Fibers with Acetone Blended Alcohols

Ultrasonic velocity (U), density (ρ) and coefficient of viscosity (η) of binary mixture of dimethyl acetamide (DAMC) and acetone at different frequencies (2MHZ, 4MHz 6MHZ, 8MHZ) have been measured at temperature 308K. Adiabatic compressibility (Ks), intermolecular free length (Lf), free volume (Vf), internal pressure (πi) and their respective excess values have been computed for entire range of mole fraction and are interpreted to explain molecular interaction occurring in the liquid mixture. Relaxation time (τ), excess enthalpy (HE) and absorption coefficient (α/f2) have been calculated and discussed.

https://www.imedpub.com/articles/acoustical-study-in-binary-liquid-mixture-containing-dimethyl-acetamide-using-ultrasonic-and-viscosity-probes.pdf

R. Paikaray

Papers

Study of acoustic parameters of binary mixtures of a nonpolar liquid with polar liquid at different frequencies

Acoustical study on ternary mixture of dimethyl acetamide (DMAC) in diethyl ether and isobutyl methyl ketone at different frequencies

Effect of frequency on acoustic parameters in a binary mixture of polar liquids

Chemical Modification of Natural Fibers with Acetone Blended Alcohols

Acoustical study in binary liquid mixture containing dimethyl acetamide using ultrasonic and viscosity probes