The transmission of airborne pathogens represents a major threat to worldwide public health. Ultraviolet light irradiation can contribute the sanification air reduce pathogen transmission. We have designed compact filter for inactivation by means UVC LED sources, whose effective irradiance is enhanced thanks high reflective surfaces. used ray-tracing and computational fluid dynamic simulations ...

Intact and decorticated single-celled Ascaris suum eggs were exposed to UV radiation from low-pressure, germicidal lamps at fluences (doses) ranging from 0 to 8,000 J/m2 for intact eggs and from 0 to 500 J/m2 for decorticated eggs. With a UV fluence of 500 J/m2, 0.44-+/-0.20-log inactivation (mean+/-95% confidence interval) (63.7%) of intact eggs was observed, while a fluence of 4,000 J/m2 resu...

Propagated (free-field) ultrasonic energy at a frequency of 26 kHz was used to expose aqueous suspensions of bacteria (Escherichia coli, Staphylococcus aureus, Bacillus subtilis, and Pseudomonas aeruginosa), fungus (Trichophyton mentagrophytes), and viruses (feline herpesvirus type 1 and feline calicivirus) to evaluate the germicidal efficacy of ultrasound. There was a significant effect of tim...

agent oriented software engineering (aose) is an emerging field in computer science  and  proposes some systematic ideas for multi agent systems analysis, implementation and maintenance. despite the various methodologies introduced in the agent-oriented software engineering, the main challenges are defects in different aspects of methodologies. according to the defects resulted from weaknesses ...

We here present a review of the problem of controlling airborne disease transmission in animal research facilities, with emphasis on engineering design and air-treatment technologies. Dilution ventilation, pressurization control, source control, and air disinfection and removal systems are reviewed, and analytical studies on the effects of dilution ventilation, filtration, and ultraviolet germi...

In this paper the writers present results which they obtained, for the most part, in making a comparative study of disinfectants that, might be used by poultrymen, a fact which accounts for the choice of test organisms and various other details of the technic. Although, as the title implies, this work was done chiefly with the hydroxide, carbonate, and phosphate of sodium, the paper also report...

In-duct ultraviolet germicidal irradiation (UVGI) systems treat moving air streams in heating, ventilation, and air-conditioning (HVAC) systems to inactivate airborne microorganisms. UVGI system performance depends on air temperature, velocity, cumulative operating time, variations in exposure time and other factors. Annual simulations of UVGI efficiency and space concentration that accounted f...

The study reported in the preceding communication (1943) showed that meningococci are much more resistant to dehydration than is generally supposed and that in films dried on glass, wood, or cotton fabric, they can survive for a week or more in the dark. The question of their susceptibility to the germicidal action of direct and diffuse sunlight seemed also to invitereexamination. The observati...

A freshly prepared aqueous solution of iodine at a pH less than eight will contain mainly two forms of free iodine, namely diatomic iodine, I2, and triiodide, Ii,. The ratio of these two forms is determined by the concentration of iodide which is usually added to bactericidal prepaations for the purpose of increasing the solubility of the iodine. The solubility of diatomic iodine at 25 C is 0.0...