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.
Reverberation. Reverberation (or reverb) is the persistence of sound in an enclosed space after its generation. It is relatively common artifact that limits the interpretation of the final imaging. This phenomenon is due to continuing repeated echoes between anatomic interfaces which are strong reflectors.hadowing. This very common artifact might be characterized as the âAchilles heelâ of echocardiography and occurs when the transmitted ultrasound beam encounters a medium of significantly different acoustic impedance and as a result is reflected back to the transducer.