Ebooks de matemáticas, página 4 de 153

Terpenoids include high value chemicals such as pharmaceuticals, chemical precursors and fine chemicals. Fruthermore, terpenoids are of interest as environmental-friendly replacement of fossil derivate chemicals. Here, the 2 C methyl D erythritol 4 phosphate (MEP) pathway was analyzed in Escherichia coli through metabolic control analysis for production of the model terpenoid isoprene. Several limiting steps were identified and their implication for an efficient pathway design is discussed.

Fueled by renewable feedstocks and powered from wind, sun, water and biomass the bioeconomy produces biobased chemicals and thus has the potential to create a sustainable chemical industry. In this dissertation, we investigated pseudomonads, a promising microbial platform organism for the bioeconomy. The complete genome of P. putida S12 was published and building blocks, namely styrene and anthranilate, which serve as precursors for bulk and high value products, were produced with pseudomonads.

This thesis presents the underlying mechanisms for the occurrence of surface anomalies in turning of difficult-to-cut materials with high-pressure coolant supply. Based on empirical and analytical investigations of each type of surface anomaly, the cause-and-effect relationships between the relevant process parameters and the surface quality were identified, translated into an explanation model and validated in a case study. Finally, an overview of different possibilities for anomaly-free machining with high-pressure coolant supply were discussed.

This work presents a new universal data management approach for eRobotics applications using distributed databases. The development and lifecycle of robotic systems features a high degree of complexity, made manageable by the eRobotics approach that combines electronic media, 3D simulation and robotics. The basis for any eRobotics application is a comprehensive 3D model of the system and its environment. Such highly complex models require an efficient data management provided in this thesis

The manufacturing industry is undergoing major changes due to current trends like mass-customization and Industrie 4.0. However, todays CAx systems and approaches are not suitable to handle adaptive CAx process chains. To overcome this situation and to close the gaps between the existing CAx environment and the requirements for the manufacturing of the future, a modular approach based on extended function blocks is presented. The proposed approach is verified based on the use case of a worn-out BLIR segment by using repair features.

Irma Franzen-Heinrichsdorff was a 20th century landscape architect, who was not widely known in Germany. Her creative horticultural work included not least her impressive "landscape ideas" for private gardens, some of which are presented and paid tribute to here for the first time. In this book, Franzen-Heinrichsdorffs remarkable biography is traced using information from previously untapped sources. Franzen-Heinrichsdorff studied at the horticultural institute "Lehr- und Forschungsanstalt fur Gartenbau" in Berlin-Dahlem and became the first woman to gain the qualification of "Staatlich diplomierte Gartenbauinspektorin", i. e. horticultural inspector, in the subject of landscape gardening. She thereby attained the highest academic honour there was in this profession at the time. Influenced by expressionism and with an interest in music and dance, the accomplished illustrator and designer had a promising career as a landscape architect ahead of her. Rather than marrying the distinguished solo flutist Alfred Tibursky, the father of her two children, she tied the knot with landscape architect Gustav Heinrichsdorff, only to divorce him several years later. Family-related and professional difficulties forced Franzen-Heinrichsdorff to give up her career, and she went on to run a childrens home in the North Sea resort of Dangast for twenty years instead. Undeterred by intermittent harassment from National Socialists, she also cared for three foster children there over the years. It was not until later in life that she had the opportunity to work as a landscape architect once again in Colorado Springs in the United States of America; two of her former foster children and her son were instrumental in paving the way for her.

Zwecks Reduktion von Reibung und Verschlei beim Tiefziehen von Leichtbauwerkstoffen wurden die Oberflachen geharteter Ziehwerkzeuge durch maschinelles Oberflachenhammern bearbeitet. Gegenstand der Dissertation ist die Erforschung der Wechselwirkungen zwischen den Parametern des Oberflachenhammerns und den resultierenden Werkzeugoberflachen sowie die Wirkungsweise von gehammerten Werkzeugoberflachen auf Reibung, Verschlei und Schmierung.

In this work the possibilities and capabilities of high-resolution crystal plasticity simulations are presented and discussed. Giving several examples, it is shown how the application of crystal plasticity simulations helps to understand the micro-mechanical behaviour of crystalline materials. To avoid the high computational costs associated with crystal plasticity simulations that arise from (i) the evaluation of the selected constitutive law, and (ii) the solution of the associated mechanical boundary value problem, both contributions to the runtime have to be kept small. This is done by (i) employing a rather simpleand therefore fastconstitutive model, and by (ii) using an effective spectral method employing fast Fourier transforms for solving the partial differential equations describing the mechanical behaviour. Here, an improved spectral solver incorporated into the Dusseldorf Advanced Material Simulation Kit (DAMASK) is used.

Evolving temperature distributions during metal cutting are of major significance. Present analytical models are not capable to predict temperature fields to a sufficient degree. This lack of model validity is caused by the limited mathematical approaches. The present thesis deals with the development of methodologies for thermal modeling based on a class of complex functions termed potential functions. This approach has never been used before for metal cutting applications.

The analysis of job requirements is crucial for companies and job seekers. The thesis deals with developing a web content mining process for analyzing job requirements in online job advertisements. It combines methods from big data analytics, knowledge discovery in databases, data mining, web mining, and natural language processing. In the future, the web content mining process can be integrated into an overarching recruiting 4.0 framework to support decision-making processes.

This thesis presents novel pathways for one step or two step modifications of different types of lignin without the need of any catalyst. Such novel functional lignins were characterized in detail and are now ready for their utilization in novel polymeric materials and thus for new applications. Hereby the value of lignin can be increased by offering novel strategies of incorporating lignins as building block into polyurethanes, but also various other polymer matrices are thinkable for future studies.

Molding tools in precision glass molding fail easily, even with protective thin film coatings applied. In this work, various efficient methods for assessing glass-coating interactions are developed, including a new, automated testing rig. Analysis of the testing results provides a better understanding of these mechanisms and how they are influenced by material properties and process parameters, so that the appropriate measures can be taken to prolong the life of the molding tools.

In dieser Arbeit wird die Entwicklung und Charakterisierung eines Wellenfrontmesssystems fur Gleitsichtbrillenglaser beschrieben. Es ermoglicht eine quantitative Messung der Wellenfront bis zu 65 mm Durchmesser mit einer lateralen Auflosung von besser als die erforderlichen 1mm fur die Inline-Qualitatskontrolle in der Produktion. Das realisierte Low-Cost System ist fur Wellenfrontsteigungen mit einer spharischen Abweichung von 2 Grad konzipiert und eroffnet eine flexible funktionale Prufung von optischen Systemen und Freiformoptiken.

A deductive kinematic model of creep-feed and speed-stroke grinding processes is developed to identify possibilities to reduce the energy introduced into the workpiece. By computer tomography analysis and tactile measurements of the grinding wheel the pore volume and the static cutting edge number are determined and included in the model. Based on the kinematic model and the grinding wheel characteristics an analytical evaluation of the specific grinding energy for speed-stroke and creep-feed grinding is carried out. The deducted process design is evaluated in experimental investigations. The generated model is evaluated by determining specific process values for the grinding forces and the grinding energy.

Manufacturing technology integration is an arising paradigm that aims at the functional integration of diverse manufacturing technologies into machine tools. This dissertation applies models of production, cost, and queuing theory to identify conditions under which manufacturing technology integration leads to greater productivity, lower cost, and smaller throughput times than a manufacturing system consisting of conventional single-technology machine tools.

MOST (Media Oriented Systems Transport) is a multimedia network technology developed to enable an efficient transport of streaming, packet and control data in an automobile. It is the communication backbone of an infotainment system in a car. MOST can also be used in other product areas such as driver assistance systems and home applications.

Precálculo, en su séptima edición, y publicado por primera vez por EDITORIAL REVERTÉ, sigue proveyendo tanto a estudiantes como profesores con explicaciones coherentemente estructuradas de los conceptos matematicos.Diseñado para un curso de uno o dos semestres para estudiantes que tomaran posteriormente un curso de calculo, esta nueva edicion conserva los rasgos que han hecho del "Precalculo" una solucion completa tanto para estudiantes como para profesores con interesantes aplicaciones, diseño de vanguardia y uso de tecnologia innovadora combinada con un numero muy elevado de ejercicios cuidadosamente redactados.En esta edicion en español se ha cuidado al maximo la traduccion y la presentacion, para que el estudiante tenga una herramienta eficaz y moderna para el estudio.

Un curso basado en este libro puede darse a nivel de un preparatorio avanzado o de un primer curso para graduados. El estudiante no precisa más preparación que la proporcionada en un curso de cálculo

Os dois volumes deste "Cálculo" servem muito bem como textos para os dois primeiros cursos de estudos que requerem uma base matemática sólida, pois para além das notáveis qualidades didácticas de um livro destinado a introduzir o aluno ao espirito e a pratica da matematica basica, acrescenta-se o peso e o rigor logico na exposiço das teorias, o que confere a esta obra o seu caracter exemplar.

Este libro se ha escrito para un curso introductorio en Cálculo de Probabilidades y Estadística, y como el título indica, para estudiantes de Ingeniería y Ciencias físicas. Los conocimientos matemáticos que debe tener el lector son los de un curso de Calculo, por lo que encaja bien en los planes de estudios de las Escuelas Tecnicas o Facultades Universitarias.