Using the most comprehensive developing country dataset ever compiled on air and water pollution and environmental regulations, the paper assesses India’s environmental regulations with a difference-in-differences design. The air pollution regulations are associated with substantial improvements in air quality. The most successful air regulation resulted in a modest but statistically insignific...

Air pre-cooling equipment is normally being employed in air-conditioning systems for pre-cooling the ambient outdoor air to enhance the air-conditioning systems performance. In this study, the potential of a passive water-to-air heat pipe based heat exchanger (HPHEX) for air pre-cooling purpose in air-conditioning systems for the high cooling load demanding regions of Iran was investigated. To ...

The essential point of this analysis is that, although arterial deficiency was shown to be virtually useless as a diagnostic criterion for emphysema, it does not follow that use of other validated radiographic criteria for diagnosing and excluding emphysema, using conventional films, should be abandoned. Interested readers can find further detailed information in reference 1.

Surgical emphysema is a relatively rare complication of dental surgery. Many cases go unrecognized or are misdiagnosed. Although the majority of cases resolve spontaneously, some can lead to potentially life-threatening complications requiring emergency intervention. A case of surgical emphysema following a routine restorative dental procedure is presented. The differential diagnosis and manage...

If and when sustained human-to-human transmission of H5N1 becomes a reality, the world will no longer be dealing with sporadic avian flu borne along migratory flight paths of birds, but aviation flu - winged at subsonic speed along commercial air conduits to every corner of planet Earth. Given that air transportation is the one feature that most differentiates present day transmission scenarios...