Aneignungen des Humanismus describes the reception and adaptation of new educational ideas at the University of Ingolstadt in the later Middle Ages. Based on manuscript research, this study explains how the process of adopting new educational procedures relates to the broader contexts for social, economic and institutional framework of teaching and learning in the 15th century.
The second edition of this professional guide presents an extended overview of the German family enterprise landscape including its structure and industry distribution. Its goal is to provide a detailed assessment of the development of German family enterprises. Based on several new scientific studies conducted by the authors, the prerequisits of corporate longevity and mature growth are investigated in detail. Analyzing data from over 500 family firms, the book offers a valuable reference guide for market research and academic research on family-owned enterprises. A unique factor: the authors’ revealing insights into the decline of family firms.
Stress, Structural and Lithology-controlled Fracture Initiation and Propagation in Deep Geothermal Boreholes in the Upper Jurassic Carbonate Rocks of the North Alpine Foreland Basin
Stress, Structural and Lithology-controlled Fracture Initiation and Propagation in Deep Geothermal Boreholes in the Upper Jurassic Carbonate Rocks of the North Alpine Foreland Basin
The development of the base-load capable, climate-friendly, and practically inexhaustible source of "geothermal energy" represents an important pillar of the energy supply of the future. If it were possible to expand geothermal energy production accordingly, Germany could generate 100% of its energy in a climate-neutral manner by 2050. The joint research project "Dolomitkluft," funded by the German Federal Ministry for Economic Affairs and Energy from 2016 to 2018, aims to establish a new and improved reservoir model for the Upper Jurassic carbonates of the Northern Alpine Foreland Basin for deep geothermal energy. Emerged from this project, the dissertation by Mr. Stockinger geomechanically and numerically characterizes the deep geothermal reservoir in carbonate rocks—limestones and dolomites—of the Upper Jurassic in the Northern Alpine Foreland Basin in over 4000 m depth. This book specifically addresses fracture initiation, propagation, and hydraulic conductivity around a borehole and their controlling factors such as the in situ stress, the existing discontinuity network, and the geomechanical rock properties. Mr. Stockinger has thus successfully addressed the most important aspects for the retrievability of deep geothermal energy at its point of origin—namely the (deep) borehole.
This professional guide presents an extensive overview of the German family enterprise landscape, with a special focus on its structure and diversity. Drawing on several scientific studies conducted by the authors, its goal is to provide a detailed assessment of the development of German family enterprises. Analyzing data from over 500 family firms, it offers a valuable reference guide for market research and academic research on family-owned enterprises. A unique factor: the authors’ revealing insights into the decline of family firms.
In the design of turbomachinery components, a significant effort is carried out regarding the optimization of efficiency. The increase in thermal efficiency particularly involves the introduction of high-performance alloys. Such alloys are for example titanium alloys. Sink electrical discharge machining (sink EDM) is a crucial manufacturing process for components due to its independence of machined material strengths; however, new materials require process design. Hence, research to understand and optimize the machining of titanium alloys is of great benefit to the industry in general. A positive tool polarity is generally adopted in sink EDM to maximize material removal relative to tool wear. Sink EDM of α/β titanium alloys as Ti6Al4V is however atypical in that these materials necessitate a negative tool polarity. Adding to the intrigue are gamma titanium aluminides (γ-TiAl), which machine better under the conventional positive polarity. Established explanatory models of sink EDM fail in resolving the removal behavior – a need for fundamental research is given. This thesis focuses on clarifying the phenomena behind this interesting behavior by investigating removal mechanisms over a range of relevant process conditions. The polarity-effect is demonstrated to arise from the polarity-dependent nature and extent of titanium carbide (TiC) formation on the workpiece surface, which significantly affects material removal mechanisms. An explanatory model, deduced from different experimental and numerical approaches, clarifies the influence of polarity to the formation mechanism of a TiC layer. With regard to monitoring of adverse layer formations, the measurement of acoustic emission (AE) is proven an appropriate concept. A correlation of the AE signal to process forces is even established, which may be crucial to determine the deflection of thin electrodes in EDM. Finally, the knowledge acquired is applied and enhanced in comprehensive process design, that also involves the machining of additively manufactured γ-TiAl. The study reveals the beneficial behavior of the fine microstructure relative to the resulting surface integrity. As a result, this thesis delivers a model-based concept for process design with respect to the adequate choice of tool polarity during machining of titanium alloys.
Few historical chronicles are as informative and eloquent as the journal written by Prince Maximilian of Wied as a record of his journey into the North American interior in 1833, following the route Lewis and Clark had taken almost thirty years earlier. Maximilian's memorable descriptions of topography, Native peoples, and natural history were further brought to life through the now-familiar watercolors and sketches of Karl Bodmer, the young Swiss artist who accompanied him. The first of the three volumes of the North American Journals recounts the prince's journey from Europe to St. Louis—then the edge of the frontier. Volume II vividly narrates his experiences on the upper Missouri and offers an unparalleled view of the region and the peoples native to it. In these pages, we accompany Maximilian as he travels far up the Missouri River to Fort McKenzie, a trading post some 2,500 river miles from St. Louis near what is now Fort Benton, Montana. The handsome, oversize volume not only reproduces this historic document but also features every one of Maximilian's illustrations—more than 200 in all, including nearly 50 in color—from the original journal now housed at Joslyn Art Museum in Omaha, Nebraska. Maximilian recorded detailed observations of flora, fauna, geology, and climate. From his unique, scientifically trained perspective, he also undertook a serious field study of the cultures and languages of the central and northern Great Plains Indians he encountered. His journal contains important, firsthand descriptions of tribal social customs, religious rituals, material culture, and art, as well as an account of Native interactions with Euro-Americans engaged in the then-burgeoning fur trade. This book is published with the assistance of the National Historical Publications and Records Commission.
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