Ultraviolet light-emitting diodes (UV-LEDs) have started replacing UV lamps. The power per LED of high-power LED products has reached 12 W (14 A), which is 100 times the values observed ten years ago. In addition, the cost of these high-power LEDs has been decreasing. In this study, we attempt to understand the technologies and potential of UV-LEDs.

Herewith a new process concept for synthesis is presented which combines both UV-photoirradiation and high-p,T intensification (photo-high-p,T) in continuous flow. The application of this procedure to Vitamin D3 synthesis promotes thermal shifting of the equilibrium from the reaction intermediate to the product. This is enabled by microreactors which allow operation under harsh conditions such ...

The compact measurement system for absolute density of oxygen ~O! atom has been developed, which employs a vacuum ultraviolet absorption spectroscopy ~VUVAS! technique with a high-pressure microdischarge hollow cathode lamp ~MHCL! as a light source. The influences of self-absorption, emission line profile of the MHCL, and background absorption of oxygen molecule (O2) on the determination of abs...

The research discusses the use of flashes ultraviolet-C rays in inducing resistance against viral pathogens and possibility its employment covered houses or garden nurseries. A number tomato tobacco plants type Nicotiana tabacum, uder protected cultivation conditions, were exposed to UV-C at wavelengths 200-280 nm using an electronic LED lamp, for 5 10 minutes, all inoculated 48 hours after las...

An ultraviolet source may be used in light mi-croscopy to excite visible fluorescence, increase resolution, or differentiate absorbing materials. The last two aims require ultraviolet-transmitting optics, usually of quartz, and have infrequently been sought by bacteriologists, especially since electron microscopy with its vastly increased resolving power became available. However, ultraviolet l...

Spruce (Picea abies Karst.) samples were irradiated using an ultraviolet light emitter mercury vapour lamp. The examined specimen surfaces contained earlywood or latewood to determine the photodegradation properties of these two tissue types. generated chemical changes monitored by diffuse reflectance Fourier transformed infrared spectroscopy. difference spectrum method was used present absorpt...

In this study, self-sensing materials have been developed owing to their ability indicate material damage through an evident optical signal. For this, fluorescent core–shell microcapsules were synthesized by in situ polymerization oil-water emulsion. These microcapsules, embedded a black epoxy resin, release revealing substance during processes that allow microcracks detection the material. The...

This article discusses the possibility of reducing dimensions ultraviolet and infrared radiation devices through use more compact lamps, evaluates quality indicators halogen lamps by method analysis variance. The parameters were measured in measuring laboratory SSZ Lisma LLC during service life: at beginning operation then after 1800 3750 hours. Samples five pieces taken from batches lamps. mai...