A three-dimensional Computational Fluid Dynamics model, coupled with sludge rheology models to account for the behaviour of mixed liquor and porous media models to represent the resistance of membranes to the fluid field, was developed and used in estimating shear stress in the filtration zone of membrane bioreactors. The influence of a suite of factors on shear stress including aerator positio...

This JAMA Insights review summarizes basic measures of indoor air ventilation as a means to explain how increases in frequency exchange and filtration capture efficiency could mitigate far-field airborne transmission SARS-CoV-2 inside rooms buildings.

Outbreak of COVID-19 in different countries is an emergency global public health recently. According to high spread the newborn virus, airborne transmission potency SARS-CoV-2 possible. Until now, there are contradictory results for air evaluation virus contaminated area. We studied patient room a hospital by two sampling strategies. Filtration method and liquid impaction were used simultaneous...

With the spread of SARS-CoV-2 virus all over world, indoor air quality commercial buildings has received intense attention. The evaluation high-volume purifiers (HAP, CADR≥800m 3 /h) is unprecedented importance. According to national standard GB/T 18801-2015, purification performance HAP and its three different replacement elements was tested by environmental chamber method. results show that p...

Forced-air-warming (FAW) is an effective and widely used means for maintaining surgical normothermia, but FAW also has the potential to generate and mobilize airborne contamination in the operating room.We measured the emission of viable and non-viable forms of airborne contamination from an arbitrary selection of FAW blowers (n=25) in the operating room. A laser particle counter measured parti...

We report an outbreak investigation of fungemia due to Penicillium species after prolonged flooding of a Thai hospital. Contaminated rubber diaphragms of blood culture bottles were identified, and the pseudo-outbreak was resolved after environmental cleaning, use of high-efficiency particulate air filtration, and strict compliance with basic infection control practices for blood culture procure...

BACKGROUND Allergenic pollen exposure is mostly seen as an outdoor phenomenon but studies have shown an indoor exposure: different pollen species including birch and grass pollen in houses, schools, and shops are leading to long-lasting symptoms even after the pollen season because pollen settle on surfaces and re-enter the indoor air depending on ventilation. To reduce indoor pollen load, wind...

In twenty dogs, anticoagulated with heparin 300 units/kg, the right cortical sensory evoked response (CSER) to contralateral median nerve stimulation was suppressed during 60 min ischemia induced by periodic infusion of 50 to 100 microliter increments of air via the right internal carotid artery. The post-ischemic recovery of the CSER was followed an additional 60 min in 19 of these animals div...