We discuss an extension of the Buckley-Leverett (BL) equation describing twophase flow in porous media. This extension includes a third order mixed derivatives term and models the dynamic effects in the pressure difference between the two phases. We derive existence conditions for traveling wave solutions of the extended model. This leads to admissible shocks for the original BL equation, which...

In this short course we will start by deriving the basic conservation laws for mass, momentum and energy. We will extend the results to mixtures in general and then to multiphase flow in porous media. We will describe the black-oil models and the Buckley-Leverett problem. Second, we will review the basic numerical methods for solving the differential equations that model a fluid in a porous med...

Philip A. May,* J. Phillip Gossage, Wendy O. Kalberg, Luther K. Robinson, David Buckley, Melanie Manning, and H. Eugene Hoyme Department of Sociology, The University of New Mexico, Albuquerque, New Mexico Department of Family and Community Medicine, The University of New Mexico, Albuquerque, New Mexico Center on Alcoholism, Substance Abuse, and Addictions, The University of New Mexico, Albuquer...

To the Editor:—I wish to congratulate Dr. Karmakar on his very thorough and informative review on paravertebral anesthesia and analgesia. 1Dr. Karmakar has overlooked one technique of paravertebral blockade that, in my opinion, has shown particular merit and is worthy of further investigation—the use of a nerve stimulator. To my knowledge, the use of a nerve stimulator as a guide to the perform...

18.1.1 Expert testimony: background The purpose of civil and criminal trials is to decide issues of fact and of law. In England, Wales and Scotland, issues of fact in the most serious criminal trials are decided by juries and issues of law by judges. For several centuries, decisions about issues of fact, in certain cases, have been assisted by experts. As early as 1554, Saunders J remarked in t...

J. Econ. Entomo!. 79: 1276-1279 (1986) ABSTRACT In 1984-85 free-flying nitidulids were trapped in centers of oak wilt, Ceratocystis fagacearum (Bretz) Hunt, for 1 year at six locations in central Texas. Two of the 10 species identified, Cryptarcha concinna Melsheimer and Coiopterus maculatus (Erichson), accounted for 57 and 35%, respectively, of the total number (3,397) of beetles trapped. Peak...

Several experiments have evidenced the occurrence of saturation overshoots for flows in homogeneous porous media. Such phenomena are ruled out by standard mathematical models, which are based on equilibrium assumptions. In this presentation we discuss nonequilibrium models, in particular including dynamic effects in the capillary pressure. This leads to extensions of the classical Buckley-Lever...