1. The transport dynamics of expiratory droplets was modelled and verified against experimental data. 2. Droplet size distributions in air were measured. Small droplets (initial size ≤45 μm) were largely airborne. Large droplets (initial size ≥87.5 μm) settled quickly. 3. The transport characteristics of expiratory droplets were highly influenced by ventilation airflow patterns. The location of...

this study presents a comparison between aluminum and iron plate electrodes on phosphate removal from aqueous solutions by electrocoagulation process. the effectiveness of main operational parameters such as initial ph, initial phosphate concentration and current density were examined. in addition, treated solution and sludge characteristics, energy consumption and electrode mass depletion w...

The electrocoagulation/flotation process is a novel approach in mining industry that is implemented to return Cu metal to the production cycle, which improves copper recovery and reduces waste water. In this research work, the response surface methodology was applied to optimize the factors effective in Cu metal recovery and sludge volume produced from thickener overflow. To this end, the D-opt...

We prove that solutions to the critical wave equation (1.1) with dimension n ≥ 4 can not be global if the initial values are positive somewhere and nonnegative. This completes the solution to the famous conjecture about semilinear wave equations of the form ∆u− ∂ t u + |u| = 0. The rest of the cases, the lower dimensional case n ≤ 3, and the sub or super critical cases were settled many years e...

this study presents a comparison between aluminum and iron plate electrodes on phosphate removal from aqueous solutions by electrocoagulation process. the effectiveness of main operational parameters such as initial ph, initial phosphate concentration and current density were examined. in addition, treated solution and sludge characteristics, energy consumption and electrode mass depletion were...

Cryo Electron Microscopy is a powerful Structural Biology technique, allowing the elucidation of the three-dimensional structure of biological macromolecules. In particular, the structural study of purified macromolecules -often referred as Single Particle Analysis(SPA)- is normally performed through an iterative process that needs a first estimation of the three-dimensional structure that is p...

Whenever major terrorist incidents happen, questions arise regarding the economic causes and consequences of these acts. The terrorist attacks of September 11, 2001, were no exception. No sooner had the dust had settled over Manhattan than studies about the human and economic costs of terrorism started to mushroom. A further immediate reaction was to trace the tragedy back to some easily unders...

IIn this study, the Electro Coagulation (EC) was used for the removal of acid orange 5 from synthetic wastewater in a batch electrochemical reactor. The impact of the operational variables such as current density, initial pH, time of electrolysis, and initial concentration of the dye was investigated. The results showed that the optimum conditions were obtained at initial pH of 7, curre...

The nature and danger of quicksand has been disputed since a long time. Despite widespread belief that humans can be swallowed or even sucked in, engineers of soil mechanics have typically asserted that, since the density of sludge is larger than that of water, a person cannot fully submerge. We investigated a specific type of quicksand at the shore of drying lagoons. Cyanobacteria form an impe...