Catálogo de publicaciones

En esta tesis se evalúan diferentes catalizadores para la reacción de alquilación de isobutano con olefinas. Se estudian zeolitas microporosas, Y, X, Beta y Mordenita. Estos materiales presentan diferentes relaciones Si/Al y la regulación de acidez se realiza mediante intercambio iónico con La+3 y/o NH4+. Se presenta también el diseño de catalizadores mesoporosos, estudiándose sílices SBA-15 funcionalizadas con grupos sulfónicos. Los materiales microporosos con niveles de acidez moderados son los que presentaron mejor actividad y estabilidad en reacción. Esto se logró en las muestras con intercambio iónico parcial de lantano y amonio. Mediante regulaciones en la cantidad de La+3 se logra producir sensibles mejoras en la estabilidad, pero ésta no resulta suficiente como para reemplazar los catalizadores líquidos. Por eso se plantean alternativas de operación para poder emplear estos catalizadores. Se evalúa la reacción de alquilación en fase gas y se estudian secuencias de reacción-regeneración con H2. En las sílices SBA-15 se logró la funcionalización efectiva de la superficie con sitios ácidos. Sin embargo no fueron activas para la reacción, lo que se atribuye a que el ambiente polar debido a la presencia de grupos sulfónicos no favorece la adsorción de la olefina, e impide la formación del carbocatión necesaria para iniciar el mecanismo de reacción. Como parte del trabajo de tesis, se desarrolló una técnica transiente de pulsos de alta frecuencia para poder realizar búsquedas de formulaciones adecuadas, prediciendo si el comportamiento catalítico, tanto en lo que refiere a la actividad como a la estabilidad, podría ser el adecuado.

This new resource is a practical overview of designing, testing and troubleshooting power electronics in alternative energy systems, providing you with the most important information on how power electronics components such as inverters, controllers and batteries can play a pivotal role in the successful implementation of green energy solutions for both stand-alone and grid-connected applications. You will learn how to choose the right components for diverse systems, from utility-scale wind farms to photovoltaic panels on single residences, how to get the most out of existing systems, and how to solve the tough challenges particular to alternative energy applications. Whether you are a renewables professional who needs to understand more about how power electronics impact energy output, or a power engineer who is interested in learning what new avenues the alternative energy revolution is opening for your work, start here with advice and explanations from the experts, including equations, diagrams and tables designed to help you understand and succeed.

• Provides a thorough overview of the key technologies, methods and challenges for implementing power electronics in alternative energy systems for optimal power generation
• Includes hard-to-find information on how to apply converters, inverters, batteries, controllers and more for stand-alone and grid-connected systems
• Covers wind and solar applications, as well as ocean and geothermal energy, hybrid systems and fuel cells

Alzheimer's Disease: Lifecourse Perspectives on Risk Reduction summarizes the growing body of knowledge on the distribution and causes of Alzheimer’s disease (AD) in human populations, providing the reader with knowledge on how we define the disease and what its risk and protective factors are in the context of a life-course approach.

At the conclusion of the book, the reader will understand why Alzheimer’s disease likely begins at conception, then progresses through early-life and adult risk factors that ultimately impact the balance between pathologic insults in the brain and the ability of the brain to modify disease symptoms. In contrast to edited volumes that may have little cohesion, this book focuses on an integrated life-course approach to the epidemiology of dementia, in particular, Alzheimer’s disease.

• Reviews the current science surrounding Alzheimer’s disease
• Provides a primer of foundational knowledge on the disease's epidemiology and biostatistics
• Utilizes a life-course approach, providing a novel and integrated view of the evolution of this illness from genes to brain reserve
• Uses the ‘threshold model’—a theory first described by Dr. Mortimer and widely accepted today—which incorporates the idea of risk factors for the pathology and expression of the disease
• Proposes that improving brain health through modifiable behaviors can delay disease onset until a later age
• Examines the future of prevention of Alzheimer’s disease, a subject of great current interest

Amazonite: Mineralogy, Crystal Chemistry and Typomorphism provides in-depth coverage of the geological setting, mineralogy, chemistry,spectroscopic parameters, typomorphic features, and potential technological and economical uses associated with amazonite discovery. Featuring detailed characterization of the geological settings of amazonite, as well a full investigation of its chemical composition, structural features, and properties with respect to each genetic type of granite, this essential reference covers all key aspects of amazonite and the benefits of its discovery.

Both newcomers and seasoned professionals in the field of mineralogy worldwide will find this translation of the popular Russian text a welcome addition to the literature on amazonite.

• Presents a thorough guide to amazonite, a mineral in geologic formations that often signifies the presence of rare earth elements
• Characterizes the distinctive features of influence in the geological setting of amazonite, as well as in the relationship between deposits and specific genetic types of the granitoids
• Includes discussion of amazonite science topics, including the crystal chemical and spectrometric parameters of amazonite and the gemological significance of the amazonite
• Provides the first English translation of the popular Russian reference book on the topic

The mission of this set of publications is to create a closer bond between academicals and industrial communities in oil and gas and petrochemical companies. This is made possible through an easy online access with highest quality features of search engine and opinion and feedback for both editors and publishers. We even offer editorial services options for those to enjoy our superior editing teams.