Libros de ciencias, página 18 de 2686

Esta obra es un texto clásico y fundamental de gemología. Trata todos los aspectos de esta materia empezando por dar unas nociones de mineralogía en general. Sigue con la gemología descriptiva propiamente dicha; aquí cada gema (ordenadas en orden de dureza decreciente) es tratada exhaustivamente: datos físico-químico-ópticos, datos históricos, génesis, yacimientos (con una amplia descripción de todos los yacimientos del mundo y distintos sistemas de extracción), formas cristalinas, variedades, usos, talla, imitaciones, etc. La obra acaba con la descripción de los métodos de análisis para las piedras preciosas y las perlas y con un elevado número de tablas en donde localizar datos de importancia en la identificación de piedras preciosas.

Today Lie group theoretical approach to differential equations has been extended to new situations and has become applicable to the majority of equations that frequently occur in applied sciences. Newly developed theoretical and computational methods are awaiting application. Students and applied scientists are expected to understand these methods. Volume 3 and the accompanying software allow readers to extend their knowledge of computational algebra. Written by the world's leading experts in the field, this up-to-date sourcebook covers topics such as Lie-Backlund, conditional and non-classical symmetries, approximate symmetry groups for equations with a small parameter, group analysis of differential equations with distributions, integro-differential equations, recursions, and symbolic software packages. The text provides an ideal introduction to the modern group analysis and addresses issues to both beginners and experienced researchers in the application of Lie group methods.

Funf Freundinnen. Vier Liebesgeschichten. Ein gefahrliches Geheimnis.Avery, Isabella, Odina, Lee und Josie sind 17, wild und die besten Freundinnen, seit sie sich im Surfcamp auf der kleinen Insel vor der Kuste South Carolinas kennenlernten. Es ist der Sommer ihres Lebens bis Josie plotzlich spurlos verschwindet. Erst zehn Jahre spater kommen sie dem Ratsel auf die Spur ...

Infrared and Raman Spectroscopy of Clay Minerals, Volume 8, is an up-to-date overview of spectroscopy techniques used in the study of cationic clay minerals. The methods include infrared spectroscopy, covering mid-IR, near-IR, far-IR and IR emission spectroscopy, as well as FT-Raman spectroscopy and Raman microscopy. This book complements the succinct introductions described in the original Handbook of Clay Science (Volumes 1 and 5B), offering even more depth and featuring the most important literature since the development and application of these techniques in clay science. No other book covers such a wide variety of spectroscopic techniques in a single volume for clay and soil scientists. In addition, some chapters will be of interest to scientists working on planetary geology, e.g. Mars, where some of the equipment either on the surface or orbiting is using spectroscopic methods to determine the soil chemistry/mineralogy of the planet under study

The latest edition of a classic textbook in electrochemistry The third edition of Electrochemical Methods has been extensively revised to reflect the evolution of electrochemistry over the past two decades, highlighting significant developments in the understanding of electrochemical phenomena and emerging experimental tools, while extending the book''s value as a general introduction to electrochemical methods. This authoritative resource for new students and practitioners provides must-have information crucial to a successful career in research. The authors focus on methods that are extensively practiced and on phenomenological questions of current concern. This latest edition of Electrochemical Methods contains numerous problems and chemical examples, with illustrations that serve to illuminate the concepts contained within in a way that will assist both student and mid-career practitioner.

An outstanding introduction to the fundamentals of regression analysis-updated and expanded The methods of regression analysis are the most widely used statistical tools for discovering the relationships among variables. This classic text, with its emphasis on clear, thorough presentation of concepts and applications, offers a complete, easily accessible introduction to the fundamentals of regression analysis. Assuming only a basic knowledge of elementary statistics, Applied Regression Analysis, Third Edition focuses on the fitting and checking of both linear and nonlinear regression models, using small and large data sets, with pocket calculators or computers. This Third Edition features separate chapters on multicollinearity, generalized linear models, mixture ingredients, geometry of regression, robust regression, and resampling procedures. Extensive support materials include sets of carefully designed exercises with full or partial solutions and a series of true/false questions with answers. All data sets used in both the text and the exercises can be found on the companion disk at the back of the book. For analysts, researchers, and students in university, industrial, and government courses on regression, this text is an excellent introduction to the subject and an efficient means of learning how to use a valuable analytical tool. It will also prove an invaluable reference resource for applied scientists and statisticians.

Artificial Intelligence in Earth Science Best Practices and Fundamental Challenges provides a comprehensive step by step guide to AI workflows for solving problems in Earth Science The book focuses on the most challenging problems in applying AI in Earth system sciences such as training data preparation model selection hyperparameter tuning model structure optimization spatiotemporal generalization transforming model results into products and explaining trained models In addition it provides full stack workflow tutorials to help walk readers through the whole process regardless of previous AI experience The book tackles the complexity of Earth system problems in AI engineering fully guiding geoscientists who are planning to implement AI in their daily work

Grassland Degradation Restoration and Sustainable Management of Global Alpine Area involves the stripping and regeneration of the grassland s mattic epipedon The stripping of the mattic epipedon is a unique phenomenon on the global alpine area which has left many unanswered questions Is stripping degradation an inherent inevitable feature of the alpine grassland ecosystem Is it an avoidable occurrence Why is ecological restoration of stripped degraded grassland extremely difficult Does restoration rely on reconstructing the grassland s mattic epipedon Or can it be done in another way How can sustainable ecological restoration be achieved Frontline researchers in global alpine area have used observational evidence from field studies to respond to these questions and to present a comprehensive picture of the problems and drivers of grassland degradation The climate environment interaction mechanism of grassland degradation is revealed by the holistic approach in this book Ecological restoration is discussed through social and economic participation and past and present restoration actions are analyzed from the perspective of traditional culture and ecological ethics The future sustainable management of grassland under climate change and social and econom

This volume covers a diverse collection of protocols currently being used by the Toxoplasma research community, and also looks at innovative methods that are pushing the boundaries of possibilities. Chapters in this book discuss topics such as isolation and genotyping of Toxoplasma gondii strains; assessing rhoptry secretion in T. gondii; plate-based quantification of stimulated Toxoplasma egress; methods to study ocular toxoplasmosis; and metabolic analysis of Toxoplasma gondii tachyzoites. Written in the highly successful Methods in Molecular Biology series format, chapters include introductions to their respective topics, lists of the necessary materials and reagents, step-by-step, readily reproducible laboratory protocols, and tips on troubleshooting and avoiding known pitfalls.Cutting-edge and thorough, Toxoplasma gondii: Methods and Protocols is a valuable resource for students or groups starting off in the field, as well as laboratories interested in implementing the latest techniques described in the book.

En 1788, los oficiales de la Armada española A. Malaspina y A. Valdez proponen un viaje ÓCientífico y Político alrededor del mundo", que salió de Cádiz el 30 de julio de 1789 con destino a Río de la Plata. Durante el periplo se realizaron estudios etnograficos y de costumbres en diferentes puertos, islas y lugares, desde el suroeste de America del Sur hasta America del Norte y el continente australiano, pasando por las islas Filipinas. Algunos de los principales lugares visitados fueron: Montevideo, Puerto Egmont, San Carlos de Chiloe, Callao de Lima, Guayaquil, Panama, Acapulco, Monterrey, Nutka, isla de Guam, Macao y Sidney. Tras cinco años de viaje, la gran empresa retorno a Cadiz en 1794, y, a pesar de ser recibidos con honores, una circunstancia politica dio un giro inesperado, comenzando con la detencion de Malaspina tras su enfrentamiento con el valido Manuel Godoy, y resultando en el Oaprisionamiento" de toda la documentacion de la expedicion hasta 1885, con la edicion mas completa de la informacion generada durante el viaje a manos del academico Pedro de Novo y Colson.

Patterns Function and Application of Seed Microbiome Bacteria Fungi and Viruses presents the current understanding of seed and microbiota associations emphasizing recent findings that highlight the latest insights into these interactions and how they may ultimately influence plant ecology health and productivity in both natural and agricultural systems The development and dispersal of seeds and their transition to seedlings are among the most critical stages of the life cycle of plants and seed health is of crucial global importance for producing both quantity and high quality crops to feed world s population It is important for seeds to be produced that contain the best hybrid embryo so that it is free of diseases includes beneficial endophytes and ensures a healthy start of a seedling Focusing on the role of seed microbiota their transmission and implications for producing healthier seeds as well as the relationship between the seed microbiome and primed plant resistance this book reveals the targeted use of the seed microbiome to enrich the soil biodiversity and its resilience and its resulting impact on plant health and yield also explores the importance of nanotechnology in the development and production of crops for both improved plant production and

Research in statistics education is an emerging field, with much of the work being published in diverse journals across many disciplines. Locating and synthesizing this research is often a challenging task, as is connecting the research literature to practical issues of teaching and assessing students. This book is unique in that it collects, presents, and synthesizes cutting edge research on different aspects of statistical reasoning and applies this research to the teaching of statistics to students at all educational levels. Unlike other books on how to teach statistics, or educational materials to help students learn statistics, this book presents the research foundation on which teaching should be based. The chapters in this volume are written by the today''s leading researchers in statistics education. This volume will prove of great value to mathematics and statistics education researchers, statistics educators, statisticians, cognitive psychologists, mathematics teachers, mathematics and statistics curriculum developers, and quantitative literacy experts in education and government.