Vin = input
Vout = Output
It seems with your half-wave rectifier, that you are depending on the diodes reverse break-down voltage to help you out. Without using Zener diodes (or equivalent), there is a 99% chance that the signal at the output of the opamp (operational amplifier) (point 6) will NOT go to Vout, unless Rf is a ridiculously small value, which in that case will make your "rectifier" just a plain resistor.
Because the non-inverting input (pin 3) is connected to ground, this amplifier runs as an inverting amplifier.
I think it is better to replace the diode connected between pins 6 and 3 with a resistor of at least 100K.
As for your full-wave rectifier, I think R5 can be omitted.
opamps tend to provide a ridiculous (I think) amount of gain, so you may get away with high or infinite feedback resistors.
that circle on the left represents the output provided from the last circuit.
There are others here that dealt with opamps more than me that can help you further.