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 is most often seen in first-time pregnancies, in pregnant teens, and in women over 40. Other risk factors include: 1  A history of high blood pressure prior to pregnancy. 2  A history of preeclampsia. 3  Having a mother or sister who had preeclampsia.