decolorization of aqueous solutions containing ionic dyes (reactive blue 19 and acid black 172) by a tfc commercial polyamide nanofilter (nf) in a spiral wound configuration was studied. the effect of operating parameters including feed concentration (60-180 mg/l), pressure (0.5-1.1 mpa) and ph (6-10) on dye removal efficiency was evaluated. the response surface method (rsm) was utilized for th...

In some cases the optimum is the minimum of the objective function (mathematical optimum), but in other cases the optimum is given by a technical constraint (technical optimum). The present paper shows the both types in two problems. The first problem is to find the optimum dimensions of a ring-stiffened circular cylindrical shell subject to external pressure, which minimize the structural cost...

25 The intensification and increased frequency of weather extremes is emerging as one 26 of the most important aspects of climate change. We use Monte Carlo simulation to 27 understand and predict the consequences of variations in trends (i.e., directional 28 change) and stochasticity (i.e., increase in variance) of climate variables and 29 consequent selection pressure by using simple models o...

The effects of pressure, temperature, and pH on the n&\-i@ of purified rabbit skeletal muscle magnesium-activated ATPnsc were measured. The enzyme is rnpidl> and irreversibly inactivated by both temperature and pressure and shows no rvidencc of reversible denaturation. The extent of irreversible inactivation depends on the amount of pressure applied and is largest at the optimum pH of the enzyme.

The pumping mechanism of the heart is pulsatile, so the heart generates pulsatile flow that enters into the compliant aorta in the form of pressure and flow waves. We hypothesized that there exists a specific heart rate at which the external left ventricular (LV) power is minimized. To test this hypothesis, we used a computational model to explore the effects of heart rate (HR) and aortic rigid...