General Relativity has passed all experimental and observational tests to model the motion of isolated bodies with strong gravitational fields, though the mathematical and numerical study of these motions is still in its infancy. It is believed that General Relativity models our cosmos, with a manifold of dimensions possibly greater than four and debatable topology opening a vast field of investigation for mathematicians and physicists alike. Remarkable conjectures have been proposed, many results have been obtained but many fundamental questions remain open. In this monograph, aimed at researchers in mathematics and physics, the author overviews the basic ideas in General Relativity, introduces the necessary mathematics and discusses some of the key open questions in the field.
Since the first edition in 1981, Social Work Research and Evaluation has provided graduate-level social work students with basic research and evaluation concepts to help them become successful evidence-based practitioners, evidence-informed practitioners, and practitioners who are implementing evidence-based programs. Students will gain a thorough understanding and appreciation for how the three dominant research methodologies-quantiative, qualitative, and mixed methods-will help them achieve their professional goals, regardless of their area of specialization. Written in clear, everyday language, this edition also includes the pedagogical features that will make it easy and effective for classroom use.
The most complete reference work on mosquitoes ever produced, Mosquitoes of the World is an unmatched resource for entomologists, public health professionals, epidemiologists, and reference libraries.
Rainforests play an important role in the health of the world. Plants, animals, and people all depend on rainforests for many reasons. A tropical rainforest is filled with wonder and mystery, from the tallest trees in the canopy to the darkest and wettest leaves on the forest floor. The animals that inhabit this biome are varied and exotic. What readers may not realize is that not all rainforests mark the areas around the equator. Temperate rainforests, with milder climates, extend toward the poles. Readers learn the similarities and differences between these two biomes.
The twin river hamlets of Lambertville, New Jersey, and New Hope, Pennsylvania, hold a special place in America's history. The tiny pocket of land on which they sit borders the Delaware River on the east and west, and it is this famous waterway that has fostered life as far back as the days when the Lenni Lenape fished and hunted here. Much has changed since the land was purchased by representatives of King Charles II in the late seventeenth century, but what continues to make Lambertville and New Hope special are their deep and enduring ties to the past. This intriguing visual history documents the proud heritage of these riverfront communities from the dawn of photography to the early 1900s through two hundred carefully selected images accompanied by detailed and informative text. Photography is perhaps the most remarkable of all our historic records because it brings history to life for so many people. The images collected for this book provide a window into the past that is both intimate and learned: one image tells of the human toil and ingenuity that went into the digging of the canal system, while another takes us into the carefree world of two young lovers setting out with parasol and oars to spend some quiet moments together on the Delaware in the Victorian era.
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