Oceanic lithosphere is continuously formed at a constant rate at the mid-ocean ridges 1 0 = 0. Thus at x = 0 the temperature is the Heaviside step function. Finally, we assume the system is at a quasi-steady state, so that the temperature distribution is constant in time, i.e. T=T(x,z).
Because preeclampsia can prevent proper blood flow to the placenta, babies may be born prematurely and can suffer from later conditions such as learning disabilities, epilepsy and hearing and vision problems.
How you can prevent them. 1  Stretching exercises can help stop cramps before they strike. 2  Alternate periods of activity with periods of rest, and put your feet up as often as you can when you're seated. 3  Wear support hose during the day. 4  Make sure you're drinking enough fluids â at least eight glasses a day.