Ignition by Sunlight

Degradation of citalopram by simulated sunlight.

Citalopram (CIT), 1-(3-dimethylaminopropyl)-1-(4-fluorophenyl)-5-phthalancarbonitrile, a selective serotonin reuptake inhibitor, is one of the most widely used antidepressants for the treatment of anxiety, obsessional, and control disorders. The degradation of the pharmaceutical CIT hydrogen bromide in water was investigated in the dark and in a growth chamber outfitted with fluorescent lamps s...

Thermite powder ignition by localized microwaves

This paper presents a new method to ignite pure thermite powder by low-power microwaves ( 100 W). In this method, the microwave energy is supplied locally to the powder. It creates a confined hotspot, and initiates a self-propagating combustion in the entire powder volume. The coupled thermal–electromagnetic interaction evolved within the powder prior to its ignition is simulated theoretically,...

Premixed flame ignition by transient plasma discharges

Flame ignition by short-duration (≈ 50 ns) transient plasma, or corona, discharges was investigated for methane-air, propane-air and butane-air mixtures at atmospheric and elevated pressures. Such discharges produce a larger fraction of high-energy electrons, yield more spatially distributed energy and deposit energy in the gas more efficiently than conventional arc discharges do. We show that ...

Nif Ignition

Sunlight and Vitamin D

Vitamin D is the sunshine vitamin that has been produced on this earth for more than 500 million years. During exposure to sunlight 7-dehydrocholesterol in the skin absorbs UV B radiation and is converted to previtamin D3 which in turn isomerizes into vitamin D3. Previtamin D3 and vitamin D3 also absorb UV B radiation and are converted into a variety of photoproducts some of which have unique b...