α-Fe2O3 (hematite) is the most stable iron oxide under ambient conditions. This transition metal oxide has been extensively investigated because it has unique electrical and catalytic properties. In this report, a novel microwave method for preparation of α-Fe2O3 nanoparticles has been developed. The process contained two steps: first, precursor were obtained from a mixed solution of 50 ml of 0...

Various extraction techniques were applied in the extraction of the biologically active constituents. The methods employed were traditional maceration extraction, microwave-assisted extraction(MAE), and ultrasound extraction (UE). Compared to the maceration extraction, MAE and UE methods provided high extraction yield, requiring short time frames and less labour. Microwave irradiation is a prov...

B4C–Al2O3 composite powder was produced by aluminothermic reduction in Al/B2O3/C system. In this research, microwave heating technique was used to synthesize desired composite. The ball milling of powder mixtures was performed in order to study the effect of mechanical activation on the synthesis process. The synthesis mechanism in this system was investigated by examining the correspondi...

A simple technique for obtaining good chromosomal G-banding on fresh blood and bone marrow is presented. The usual technique is modified by using a microwave oven before staining the preparations with Wright's stain.

We prepared trifluoroacetyl, pentafluoropropyl, and heptafluorobutyl derivatives of amphetamine, methamphetamine, and 3,4-methylenedioxymethamphetamine (MDMA) in 45 s, 1 min, and 6 min, respectively, by using microwave irradiation. Conventional techniques require heating the reaction mixture for 15 min at 40 degrees C for trifluoroacetyl derivatives, 15 min at 75 degrees C for pentafluoropropyl...

Microwave irradiation has become an acceptable technique for assessing small quantities of neurochemical substances in the brain. These substances are acetylcholine, cyclic nucleotides, biogenic amines, enkephaline and r-aminobutylic acid (1-4). Rapid inactivation of brain enzymes by microwave irradiation prevents postmortem changes of tissue substances. Although it is known that brain biogenic...

Recent advances in radar techniques and systems have favoured the development of microwave interferometers, suitable for the non-contact vibration monitoring of large structures. The paper addresses the application of microwave remote sensing to the measurement of the vibration response in the stay-cables of cable-stayed bridges. The reliability and accuracy of the proposed technique were inves...

Objective: A microwave assisted extraction technique was developed to optimize the extraction of mucilage from the fruits of Trichosenthes dioica plant. Materials and Methods: the plant has been extracted by conventional and microwave assisted methods for the isolation of mucilage. Results and Discussion: Microwave extraction at 320 W intensity and 20 min heating duration, 84.92% increase in th...

High-frequency dielectric properties of A5B4O15 ~A5Ba, Sr, Mg, Zn, Ca; B5Nb, Ta! dielectric ceramics are studied by means of the microwave cavity technique, a combination of far-infrared reflection and transmission spectroscopy and time-resolved terahertz transmission spectroscopy. Microwave permittivity e8 and Q3 f factor vary, depending on the chemical composition, between 11 and 51, and 2.4 ...

When traditional sintering techniques are used it is difficult to obtain dense materials with nanometric or submicrometric grain sizes. Microwave sintering was proposed as an alternative technique to overcome the problems of conventional fast heating. However, various problems usually occur when ceramics are sintered by direct microwave heating [1]. Hybrid heating techniques, which combine dire...