A 0.9 to 1.5 kW, 2.45 GHz atmospheric pressure air microwave plasma torch has been operated efficiently with less than 1 % reflected power. The plasma is sustained in a 28 mm internal diameter fused quartz tube which penetrates perpendicularly through the wide walls of a tapered and shorted WR-284 (72 x 17 mm cross-section) waveguide. A study has been made of the effects of power and airflow on...

This work intends to investigate the optimum sintering method and temperature that can improve efficiency of bismuth telluride cold compact pellets, for thermoelectric applications. Different p-type n-type pellets were treated using three different techniques conditions: pressure less (conventional), microwave, tube (using argon environment) at temperatures 250 °C, 300 350 400 °C. The structura...

One of the most useful tools available to researchers is sodium dodecyl sulfate polyacrylamide gel electrophoresis (SDS-PAGE) (3). It is a rapid and relatively simple method for resolving proteins and is routinely used to monitor proteins during purification, assess expression levels, estimate molecular weights and characterize multimeric proteins. A number of variations exist, but the method d...

Microwave-assisted solid sampling analysis coupled to flame furnace atomic absorption spectrometry (MW-SS-FF-AAS) was used for Cd and Pb determination in food-contact polymer samples, with the aim of minimizing reagents laboratory waste. Operational parameters, such as FF tube design, oxygen flow rate, stoichiometry, sample mass, among others, were evaluated optimized. Calibration performed usi...

background: polychlorinated biphenyls (pcbs) are occupational and environmental pollutants and hazardous organic compounds that have created major environmental and occupational challenges. pcb compounds have different health effects in humans depending on sex, age, route of entry, intensity, and frequency of exposure. this study was conducted to determine the effect of microwave rays, hydrogen...

Vacuum electronic sources have shown marked improvement since the invention of the magnetron before World War II, and dramatic increases in both average powers and frequencies have been achieved. Of course, much of these gains have been achieved by the development of different devices. The typical development pattern for a given device exhibits an initial period of rapid improvement followed by...

The intensive research on ferroelectric electron-emission mechanisms in the last decade has resulted in a wide understanding of the physics and characteristics of this plasma-assisted electron source. Nevertheless, practical devices employing this cathode were hardly introduced. In this experimental study, a high-repetition-rate microwave oscillator based on a ferroelectric electron gun has bee...

In recent years, metal-organic frameworks (MOFs) membranes have attactted great interest due to their particular properties in separation and catalysis fields . Although there are some reports on MOFs membranes by different fabrication techniques such as in-situ synthesis, secondary growth, microwave-assisted method, etc , searching for good synthesis methods for MOFs membranes are still hot re...

objective the purpose of this study was to assess the frequency of complications of endotracheal intubation (eti) in neonates. methods the newborns that were admitted and needed urgent or semi-urgent intubation were enrolled in this study over a 1 year period. route for intubation in all cases were orotracheal. cases were not routinely sedated or paralyzed. the patients were clinically and radi...