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.
Preeclampsia: Symptoms, Risks, Treatment and Prevention. Preeclampsia is a condition that occurs only during pregnancy. Some symptoms of preeclampsia may include high blood pressure and protein in the urine, occurring after week 20 of pregnancy.