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For transformers in service, aging markers from cellulose in oil such as furans, water, methanol and acids are measured for diagnostic purposes. The content of these indicators, measured in oil, may therefore vary with load, temperature, solid and liquid insulation aging, as well as marker stability and evaporative loss. Correction factors estimating the level of the aging marker to a reference temperature...
As shed and sheath materials, high temperature vulcanization (HTV) silicone rubber suffers from various types of environmental stresses in actual use. Liquids permeation, as a kind of silicone rubber aging factor, has been investigated by many researchers. However, most of the studies are conducted under the condition of no electric field. Since that composite insulators, especially the high voltage...
In this work, investigation has been made of a planar millimeter wave antenna on microfluidic channels which allow a very large resonance frequency tuning up to 51% (from 16.8 to 28.4 GHz). A microstrip antenna lays over a 12 mil (300 µm) thick liquid crystal polymer (LCP) substrate in which two micro-channels are drilled to be filled with different dielectric liquids (water, ethanol, methanol, acetone)...
We demonstrate end-fire excited THz radiation coupled in thin layers of water propagating a distance of 4 cm. As the propagation lengths are critically dependent from the permittivity, we experimentally demonstrate this propagation length dependency by stepwise exchanging the material layer from deionized water to pure ethanol.
Some anti-allergic activities of the rhizome of Atractylodes japonica have been reported previously. But, the active principle(s) for anti-allergic action is not fully elucidated. In the present study, the 70% ethanol extract of the rhizome of A. japonica was prepared. For elucidation of its anti-allergic activity, the inhibitory activity against 5-lioxygenase (5-LOX)- catalyzed leukotriene (LT) production...
This paper discusses the optimization of onboard generation of hydrogen fuel using cold plasma. First, a review of the efficiency of a hydrogen fuel cell using this technology is given. The major focus is the optimization of fuel type to the cold plasma chamber. The energy input needed and carbon dioxide emissions of different fuel types to be used in this procedure are discussed. As hydrogen storage...
Chitosan-betaine derivative was prepared by chitosan and betaine hydrochloride through dry process in the presence of dicyandiamide. The product exhibited solubility, practical flocculating property and antibacterial efficacy.
An experimental pool boiling study was conducted using plain and nanocoated heater surfaces immersed in various working fluids. Working fluids include water, ethanol and HFE-7100 and pool boiling tests were performed on a flat 1 cm × 1 cm heaters. Unlike in water, CHF enhancement of the nanocoating seems to be less or marginal in ethanol and HFE-7100 at 1 atm. The reduced effect of the nanocoating...
Dispersion of lanthanum hexaboride (LaB6) nanoparticles in water and in sol-gel silica was investigated. The average size of lanthanum hexaboride nanoparticles/agglomenties decreases with increasing magnitude of the zeta potential in water with and without citric acid. Citrate-coated LaB6 nanoparticles were freeze-dried and mixed with TEOS/ethanol/water/HCl to disperse the nanoparticles in the sol-gel...
A salting-out phase separation microextraction /liquid chromatography method was used for the simultaneous determination of three phenols in water, including α-naphthol, β-naphthol and bisphenol A. The chromatographic conditions: Diamonsil C18 column (5μm, 150×4.6 mm i.d.) was used; The column temperature was room temperature; The mobile phase was methanol / water (57:43); The flow rate was 1.0 mL/min;...
Supported nano Cu/Fe bimetal was prepared by using KBH4 as the reducing agent when micro-scale graphite as a support material. This supported nano bimetal showed the well reductive chlorination to trichloroethylene(TCE) in the solution. The nano Cu/Fe with spherical particle and spherical nanocluster structure were synthesized in the H2O and ethanol/H2O system respectively. The size of spherical nano...
Polysaccharides from wild Termitomyces albuminosus (PWTA) were extracted using hot water extraction method at various extraction conditions. Single-factor experiments, an orthogonal L9(3)4 test, and response surface methodology (RSM) were combined for experimental design and analysis, aiming to evaluate the effects of the extraction parameters on the extraction yield of PWTA and to obtain the optimal...
With the profoundation of study on biodiesel, it can be found that biodiesel and water may format micro-emulsion fuels only with the existence of ethanol, furthermore, more water and biodiesel can be micro-emulsified with certain surfactants and ethanol. To study the application of biodiesel-ethanol-water micro-emulsion fuels, the paper indicates the preparation of the micro-emulsion fuels, and their...
The nutritional evaluation and free radical scavenging activities of Foeniculumvulgare were investigated in this study. Proximate analysis and minerals contents were evaluated according to AOAC methods while the scavenging activities of water and ethanol extract of F. vulgare towards 2,2-diphenyl-1-picryhydrazyl (DPPH) radical were established in vitro systems. The chemical analysis of F. vulgare...
By means of phase-sensitive laser setup the study of detection of thermal microinhomogeneities in fluids is carried out. Presence in liquid medium small-scale unsteady thermal inhomogeneities should be appeared in local variations of an index of refraction. These variations were required to be discovered by laser sounding of a optical cell with a fluid and by registration of frequency-phase fluctuations...
We developed a system for characterizing the dielectric properties of various materials by transmission imaging using wavelengths in the millimeter range from 25 GHz to 65 GHz. By using this system, we confirmed that the difference in the transmission between commercial pork containing only water and pork containing ethanol was significant and that we could monitor and image the penetration of ethanol...
Airborne chem/bio sensors increase in importance every day for applications in homeland security for the detection of bio-hazardous materials and improvised explosive devices (IED); in the spoilage of food; in the health care industry for detecting cancer, diabetes, and other conditions; and in many other industries. A number of ultrasonic sensors have been developed and used in the chem/bio sensing...
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