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.
Pre-eclampsia is thought to happen when the placenta isn't working properly. It can make you and your baby quite ill if you don't receive the treatment you need. Pre-eclampsia causes the flow of blood through the placenta to be reduced. This means that your baby won't get enough oxygen and nutrients, which may restrict his growth. Pre-eclampsia usually happens in the second half of pregnancy, or shortly after the birth (NHS Choices 2011) .