In Section 3, we analyze the case ofindirect government control, i.e., state subsidization of privately owned media. We endoge-nize government control in Section 4, asking when the government would choose to take overprivately owned media. Section 5 extends the model to multiple media outlets.
Small Angle Gradient Echo Methods. The gradient echo technique is generally used in combination with an RF excitation pulse that has a small flip angle of less than 90Ë. We will discover that the advantage of this is that it permits the use of shorter TR values and this, in turn, produces faster image acquisition.
It is possible to produce an echo event by applying a magnetic field gradient without a 180Ë RF pulse to the tissue as in the spin echo methods. There are several imaging methods that use the gradient echo technique to produce the RF signals and these make up the gradient echo family of methods.