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In this research, results of an experimental study of prickly ash seed cust oil on the preparation of fatty acid methyl ester by lipase catalysis were presented. Factors such as n-hexane, the FAME rate, water concentration, volume of lipase, et al were studied. The experiment results showed that n-hexane is most suitable solvent in the non-aqueous lipase catalytic system and the FAME rate reach the...
Steady-state electrohydrodynamic micropumping through bipolar conduction phenomenon has been investigated experimentally and numerically. A single-stage axisymmetric conduction micropump in the vertical configuration has been proposed in this paper. This micropump consists of four components: high voltage ring electrode, grounded disk-shaped electrode, insulator spacer, and inlet/outlet ports. The...
A method for extraction and separation of petroleum hydrocarbons (PHs) and polycyclic aromatic hydrocarbons (PAHs) from heavy oil-polluted soil was developed. Effects of several factors such as ultrasonic power, temperature, and elution solvents on the extraction were investigated. The experimental results indicated the optimal experimental conditions were obtained as follow: 300 watt of ultrasonic...
The transesteriflcation of crude cottonseed oil with methyl acetate to biodiesel catalyzed by combined lipases (Lipozyme TL IM and Novozym 435) was investigated. The significant variables of transesterification (methanol concentration, combined lipases concentration and reaction temperature) were screened from six variables by PlackettBurman (PB) design and were further optimized via response surface...
A procedure for the determination of synthetic musks compounds (Galaxolide (HHCB), Tonalide (AHTN), musk xylene (MX) and musk ketone (MK)) in water samples was described. Analytes were extracted from the samples using solid phase extraction (SPE) system on ENVI-C18 cartridges and then determined by gas chromatography-mass spectrometry (GC-MS). Influence of five experimental parameters (volume of eluent,...
This paper presents an analytical model which describes the dielectric strength of insulating liquids stressed with the impulse electric fields. The Joule heating by the space charge saturated current may cause over-heating of pure liquids or may result in generation of nucleation centers associated with impurities in the case of practical liquids. Evaporation of the liquid from these impurities has...
The paper presents the results of researches on modifying dielectric properties of hydrocarbons by the addition of fullerenes. Three hydrocarbons where analyzed - toluene, cyclohexane and n-hexane - against their electrical capacity, resistivity, dielectric loss tangent and tendency to electrification. The influence of C60 fullerene doping on all examined characteristics were determined.
In the present paper, we reported a cataluminescence (CTL) sensor using nanoporous In2O3 as sensing material to determine trace acetic acid in air. The proposed sensor showed high sensitivity and selectivity to acetic acid at optimal temperature of 293degC. Quantitative analysis was performed at a wavelength of 440 nm. The linear range of CTL intensity versus concentration of acetic acid are 25 mL/m...
An analysis on polycyclic aromatic hydrocarbons (PAHs) deposited in road dust at downtown areas in a large city of Korea, Ulsan, was carried out in March 2006 to identify the concentrations as well as characteristics of these compounds. Road dust samples were taken at 3 sites in which 2 sites are in downtown areas and 1 site is in a typical residential area of Ulsan. Road dust samples were separated...
Summary form only given. Terahertz time-domain spectroscopy (THz TDS) and its extension to probing the transient properties of materials through pump-probe measurements have been shown to be powerful probes of the steady-state and dynamical properties of charge carriers. While the method has been applied extensively to solids such as semiconductors and superconductors, it has not yet been exploited...
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