Global Warming Cycles: Ice Ages and Glacial Retreat
Earth has always exhibited patterns of heating up and cooling down. At some points in time, many areas of Earth were shrouded in blankets of ice, with ice caps and glaciers dominating the landscape. Certain areas on Earth have been covered with prominent glaciers multiple times in the past for millions of years. Since the last ice age, which ended just over 10,000 years ago, the Earth's climate has been relatively stable, with just a few fluctuations;...
While there are several factors that contribute to global warming, such as natural changes in the Earth's inclination and revolution around the sun, by far the biggest factor is the emission of greenhouse gases. Carbon dioxide, methane, ozone, chlorofluorocarbons, water vapor, and nitrous oxide are added at alarming rates to the atmosphere by daily human activity. Every person on Earth has a 'carbon footprint' - a measure of greenhouse gas contributed to the atmosphere on a daily basis.
This book describes language as a network of functional relations involving a context which is also a network of functional relations. The essays in Part I present several perspectives on the theory of language as functional relations. The essays in Part II discuss an oral text using a variety of functional perspectives. All of the essays are by linguists interested in oral and written texts who have achieved international recognition in their fields. Illustrated in this book are cognitive, social construction, social praxis and anthropological approaches to the description of text.
This thesis presents several new insights on the interface between mathematics and theoretical physics, with a central role for Riemann surfaces. First of all, the duality between Vafa-Witten theory and WZW models is embedded in string theory. Secondly, this model is generalized to a web of dualities connecting topological string theory and N=2 supersymmetric gauge theories to a configuration of D-branes that intersect over a Riemann surface.
Guide to the Universe: Asteroids, Comets, and Dwarf Planets
This volume in the Greenwood Guides to the Universe series covers asteroids, comets, and dwarf planets—those small bodies that revolve the Sun—and provides readers with the most up-to-date understanding of the current state of scientific knowledge about them. Scientifically sound, but written with the student in mind, Asteroids, Comets, and Dwarf Planets is an excellent first step for researching the exciting scientific discoveries of the smallest celestial bodies in the solar system.
