The development of high performance, massively parallel computers and the increasing demands of computationally challenging applications have necessitated the development of scalable solvers and preconditioners. One of the most effective ways to achieve scalability is the use of multigrid or multilevel techniques. Algebraic multigrid (AMG) is a very efficient algorithm for solving large problems on unstructured grids. While much of it can be parallelized in a straightforward way, some components of the classical algorithm, particularly the coarsening process and some of the most efficient smoothers, are highly sequential, and require new parallel approaches. This chapter presents the basic principles of AMG and gives an overview of various parallel implementations of AMG, including descriptions of parallel coarsening schemes and smoothers, some numerical results as well as references to existing software packages.

Collection of Tex-Mex folklore and related essays, including papers presented at Texas Folklore Society meetings. The book is organized into four topical categories: I. Remembering Our Ancestors, II. Texas-Mexican Folklore, III. Miscellaneous Memorabilia, and IV. The Family Saga (Cont'd).

Interview with Allen H. Benton, World War II-era veteran of the 112th Cavalry, Texas National Guard. The interview includes Benton's personal experiences about childhood in upstate New York and the Depression-era economy, education at Cornell University, drafting into the U.S. Army Infantry and service at several stateside bases, transferring to Cavalry and combat in the Pacific Theater, and having a career as an author of biological field guides. The interview also includes Benton's memories of the Japanese surrender in Tokyo Bay as well as his opinions on war in general.

Biweekly, comprehensive compilation of decisions, reports, public notices, and other documents of the U.S. Federal Communications Commission.

Biweekly, comprehensive compilation of decisions, reports, public notices, and other documents of the U.S. Federal Communications Commission.

Biweekly, comprehensive compilation of decisions, reports, public notices, and other documents of the U.S. Federal Communications Commission.

In the nine stories of Let’s Do, various calamities strike ordinary Midwesterners, who cope with a mixture of good intentions and ineptitude. Balancing humor with painful clarity, author Rebecca Meacham pulls readers into the lives of characters who struggle with—and more often against—change. “Rebecca Meacham has one of the freshest voices I've encountered in a long time. Blatantly wise, she creates stories that are deliciously subversive, brave and outrageous, reminiscent of a young Alice Hoffman. As the lives of her characters get derailed, they move with the damaged grace of walking through broken glass on tiptoe. This is a writer whose words speak with emotional resonance about the resilience of the human heart—a beautiful, authentic talent who knows that when you turn life upside down, you get good measures of both trouble and laughter, a lesson the very best writers recognize early.”—Jonis Agee, judge