Böcker av William G. Gray

This unitary resource sets out the derivation of conservation, thermodynamic, and evolution equations used in modeling multiphase porous media systems. It includes detailed, multiscale applications and a forward-looking discussion of open research issues.

This textbook presents an understanding of how basic physical descriptions can be translated into mathematical analogues that provide an opportunity to investigate environmental processes. Examples come from a range of hydrologic, atmospheric, and geophysical problems. The emphasis is on simple examples and calculations that add to understanding. The book provides a sense for the meaning of mathematical expressions, a physical feel for their relations to processes, and confidence in working with mathematical solutions. The goal of this book, in essence, is to present the timeless basic physical and mathematical principles and philosophy of environmental modeling, often to students who need to be taught how to think in a different way than they would for more narrowly-defined engineering or physics problems. Minimum prerequisites for the student reader include a knowledge of calculus through differential equations, but the book provides the mathematical and physical tools needed as the occasion arises.

As an "omniscient and obnoxious" teenager in 1969, Alan Richardson wrote to the occult author William G. Gray in pursuit of instant magical enlightenment. It was the beginning of a correspondence lasting many years in which Gray generously shared his magical knowledge and experience.

A previously unpublished work by the late W.G. Gray, comprising a course in modern Hermetic ritual magic and practical Qabalah.

The Rollright Ritual is a powerful initiatory rite for attuning oneself to a personal path of spiritual growth, presented here with an explanatory text and a discussion of the spiritual lives and practices of the stone circle builders of Great Britain.

This book looks at the mathematical-physical rationale behind the equations that are currently used to describe the flow of fluid and transport of solutes in porous media. It presents a comprehensive approach to the development of appropriate equations without prior knowledge of continuum mechanics, mixture theory, or similar areas of expertise.