Geophysical Well Logging is a three-chapter text that discusses the physics of well logging measurements. This book describes the techniques universally used in formation evaluation, including electrical, nuclear, and sonic techniques. Chapter 1 deals with the special features of logging measurements, tool design, and the relation between logging and coring. This chapter also examines the hostile downhole environment as basic sonde configurations and combination tools. Chapter 2 discusses elementary interpretation principles, the role of logging in formation evaluation, and the uninitiated to the motivation for the wide variety of measurements found in practice. Chapter 3 investigates the physics behind electrode and induction methods for measuring electrical resistivity, as well as the concepts of geometric factor, skin effect, focused measurements, and pseudo-geometric factor. It also considers significant topics on neutron transport and moderation and their application to neutron sonde design and logging measurements; gamma-ray transport and its application to density and photoelectric-absorption logging; methods for the measurement of gamma-ray spectra; and scintillation and germanium spectrometers. This chapter further explores the body and borehole waves of the sonic methods; waves in porous media; conventional interval-transit-time techniques; and full-waveform analysis methods. Physicists, chemists, and engineers who are interested in geophysical field-measurement methods will greatly benefit from this book.
Geophysical Well Logging is a three-chapter text that discusses the physics of well logging measurements. This book describes the techniques universally used in formation evaluation, including electrical, nuclear, and sonic techniques. Chapter 1 deals with the special features of logging measurements, tool design, and the relation between logging and coring. This chapter also examines the hostile downhole environment as basic sonde configurations and combination tools. Chapter 2 discusses elementary interpretation principles, the role of logging in formation evaluation, and the uninitiated to the motivation for the wide variety of measurements found in practice. Chapter 3 investigates the physics behind electrode and induction methods for measuring electrical resistivity, as well as the concepts of geometric factor, skin effect, focused measurements, and pseudo-geometric factor. It also considers significant topics on neutron transport and moderation and their application to neutron sonde design and logging measurements; gamma-ray transport and its application to density and photoelectric-absorption logging; methods for the measurement of gamma-ray spectra; and scintillation and germanium spectrometers. This chapter further explores the body and borehole waves of the sonic methods; waves in porous media; conventional interval-transit-time techniques; and full-waveform analysis methods. Physicists, chemists, and engineers who are interested in geophysical field-measurement methods will greatly benefit from this book.
During the air battles that destroyed Nazi Germany's ability to wage war, one bomb group was especially distinguished. The Hell's Angels. At the outbreak of World War II, the United States was in no way prepared to wage war. Although the U.S declared war against Germany in December 1941, the country lacked the manpower, the equipment, and the experience it needed to fight. Even had an invasion force been ready, a successful assault on Nazi-occupied Europe could not happen until Germany's industrial and military might were crippled. Because no invasion could happen without air superiority, the first target was the Luftwaffe--the most powerful and battle-hardened air force in the world. To this end, the United States Army Air Forces joined with Great Britain's already-engaged Royal Air Force to launch a strategic air campaign that ultimately brought the Luftwaffe to its knees. One of the standout units of this campaign was the legendary 303rd Bomb Group--Hell's Angels. This is the 303rd's story, as told by the men who made it what it was. Taking their name from their B-17 of the same name, they became one of the most distinguished and important air combat units in history. The dramatic and terrible air battles they fought against Germany changed the course of the war.
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