High cleanliness of a hospital environment is necessary to ensure safe working conditions for the medical staff, a correct process of hospitalization and to protect hospital visitors, an aspect rarely mentioned. A supply of air cleaned in highly-effective air filters to hospital wards with air conditioning systems and exhaust of infected air will help in maintaining the required standards of cl...

 Background: Human hair can be used as an inexpensive and accessible adsorbent to remove a variety of pollutants from air. Although several studies have been done on removal of formaldehyde from wastewater by human hair, to date no study has investigated using hair to remove formaldehyde from air. Therefore, the aim of this study was to remove formaldehyde from synthetic contaminated a...

Background & objectives: Environmental standards are quantitative criteria for protecting the environment from pollution and degradation. One of the solutions to improve air quality status is to use reasonable limits to prevent excessive release of airborne contaminants from their various sources. On the other hand, these standards are effective in evaluating air pollution reduction strategies....

Air bubbles floating in the bladder dome during transurethral resection of a bladder tumor can interfere with the resection, causing intravesical explosion and increasing the potential risk of tumor cell reimplantation. We describe a simple and effective technique for evacuating air bubbles from the bladder dome using routine resectoscopes. First, the beak of the resectoscope is positioned near...

Dynamic sectorization is a powerful possibility to balance the controller workload with respect traffic flows changing over time. A multi-objective optimization system analyzes flow time and determines suitable time-dependent sectorizations. Our dynamic integrated into radar display as part of working environment for air controllers. use case defining climate-sensitive areas leads changes in fl...

In chamber experiments, we investigated the effectiveness of a task ventilation system with an air supply nozzle located underneath the front edge of a desk and directing air toward a heated mannequin seated at the desk. The task ventilation system provided outside air, while another ventilation system provided additional space cooling but no outside air. Test variables included the vertical an...

Lubrication with ambient air is not quite generally applied. The best known application is the “foil bearing” in tape recording systems for audio, video and computer applications; where the gap height that is needed for effective lubrication may quite easily be attained. This air gap reduces tape friction and wear of tape and recording head substantially. On the other hand, though, the air gap ...

an air filter is a significant element of any mechanical ventilation system. however, the importance and performance evaluation of air filters have not been well publicized and related scientific reports are scarce. in this study, a transportable, off-line, air filter-testing unit (the unit) was designed and utilized to simulate the filter housing of a mechanical ventilation system. the unit wa...

Along with rapid urbanization and industrialization processes, many developing countries are suffering from air pollution. Air quality varies non-linearly, the effective range of an air quality monitoring station is limited. While there are seldom air quality monitoring stations in cities, it is difficult to know the exact air quality of everywhere. How to obtain the air quality fast and conven...

Background: Air pollution and concerns about health impacts have been raised in metropolitan cities like Tehran. Trend and prediction of air pollutants can show the effectiveness of strategies for the management and control of air pollution. Artificial neural network (ANN) technique is widely used as a reliable method for modeling of air pollutants in urban areas. Therefore, the aim of current ...