The first English translation of Johannes Weigelt's 1927 classic makes available the seminal work in taphonomy, the study of how organisms die, decay, become entombed in sediments, and fossilize over time. Weigelt emphasized the importance of empirical work and made extensive observations of modern carcasses on the Texas Gulf Coast. He applied the results to evidence from the fossil record and demonstrated that an understanding of the postmortem fate of modern animals is crucial to making sound inferences about fossil vertebrate assemblages and their ecological communities. Weigelt spent sixteen months on the Gulf Coast in the mid-1920s, gathering evidence from the carcasses of cattle and other animals in the early stages of preservation. This book reports his observations. He discusses death and decomposition; classifies various modes of death (drowning, cold, dehydration, fire, mud, quicksand, oil slicks, etc.); documents and analyzes the positions of carcasses; presents detailed data on carcass assemblages at the Smither's Lake site in Texas; and, in a final chapter, makes comparisons to carcass assemblages from the geologic past. He raises questions about whether much of the fossil record is a product of unusual events and, if so, what the implications are for paleoecological studies. The English edition of Recent Vertebrate Carcasses includes a foreword and a translator's note that comment on Weigelt's life and the significance of his work. The original bibliography has been brought up to date, and, where necessary, updated scientific and place names have been added to the text in brackets. An index of names, places, and subjects is included, and Weigelt's own photographs of carcasses and drawings of skeletons illustrate the text.
The first English translation of Johannes Weigelt's 1927 classic makes available the seminal work in taphonomy, the study of how organisms die, decay, become entombed in sediments, and fossilize over time. Weigelt emphasized the importance of empirical work and made extensive observations of modern carcasses on the Texas Gulf Coast. He applied the results to evidence from the fossil record and demonstrated that an understanding of the postmortem fate of modern animals is crucial to making sound inferences about fossil vertebrate assemblages and their ecological communities. Weigelt spent sixteen months on the Gulf Coast in the mid-1920s, gathering evidence from the carcasses of cattle and other animals in the early stages of preservation. This book reports his observations. He discusses death and decomposition; classifies various modes of death (drowning, cold, dehydration, fire, mud, quicksand, oil slicks, etc.); documents and analyzes the positions of carcasses; presents detailed data on carcass assemblages at the Smither's Lake site in Texas; and, in a final chapter, makes comparisons to carcass assemblages from the geologic past. He raises questions about whether much of the fossil record is a product of unusual events and, if so, what the implications are for paleoecological studies. The English edition of Recent Vertebrate Carcasses includes a foreword and a translator's note that comment on Weigelt's life and the significance of his work. The original bibliography has been brought up to date, and, where necessary, updated scientific and place names have been added to the text in brackets. An index of names, places, and subjects is included, and Weigelt's own photographs of carcasses and drawings of skeletons illustrate the text.
How are firms, networks of firms, and production systems organized and how does this organization vary from place to place? What are the new geographies emerging from the need to create, access, and share knowledge, and sustain competitiveness? In what ways are local clusters and global exchange relations intertwined and co-constituted? What are the impacts of global changes in technology, demand, and competition on the organization of production, and how do these effects vary between communities, regions, and nations? This book synthesizes theories from across the social sciences with empirical research and case studies in order to answer these questions and to demonstrate how people and firms organize economic action and interaction across local, national, and global flows of knowledge and innovation. It is structured in four clear parts: - Part I: Foundations of Relational Thinking - Part II: Relational Clusters of Knowledge - Part III: Knowledge Circulation Across Territories - Part IV: Toward a Relational Economic Policy? The book employs a novel relational framework, which recognizes values, interpretative frameworks, and decision-making practices as subject to the contextuality of the social institutions that characterize the relationships between the human agents. It will be a valuable resource for academics, researchers, and graduate students across the social sciences, and practitioners in clusters policy.
The primary focus of this work is the processing – microstructure – property correlation of EBM manufactured high-alloyed austenitic CrMnNi stainless steel. Independent of the applied process parameters, to this point this alloy exhibits a fine-grained and weak textured microstructure in the as-built state upon EBM processing. As detailed in the literature review, this is opposite to numerous alloys like the benchmark AISI 316L stainless steel, which are commonly characterized by epitaxial growth of columnar grains elongated parallel to building direction. A theory for this unusual observation is presented based on a grain refinement due the process-inherent cyclic heat-treatment, i.e. repetitive reheating and partial melting of the consolidated material due to the energy input during melting of subsequent layers and resulting solid-liquid as well as solid-solid (ferritic bcc to austenitic fcc phase and vice versa) phase transformations. A calculation of the phase diagram, differential thermal II Abstract analysis and the investigation of the uppermost layers of bulky and thin-walled EBM processed structures are conducted to support this assumption. Moreover, the CrMnNi stainless steel specimens are characterized by an outstanding damage tolerance, which is demonstrated by tensile testing and examination of the fracture surfaces revealing large lack-of-fusion defects due to unsuitable process parameters. Combined EBSD and X-ray diffraction analysis attribute the high damage tolerance to a pronounced strain hardening and mitigation of the effect of defects due to the transformation-induced plasticity (TRIP) effect. The deformation-induced martensitic transformation and associated strain hardening has also been correlated to a considerable low-cycle fatigue performance even under the presence of large inhomogeneities. The chemical composition of the alloy upon EBM processing is strongly dependent on the process parameters, i.e. it is demonstrated that the evaporation rate of Mn varies with the scan strategy and volumetric energy density. This phenomenon is utilized for the fabrication of homogeneous specimens with different Mn concentrations and resulting mechanical properties.These findings are subsequently employed for a prove-of-concept of the possibility to produce functionally graded material by a spatial adjustment of the scan strategy throughout the layer-wise built-up of objects. This is a novel approach for the synthetization of functionally graded materials based on the processing of one homogenous precursor powder feedstock. In summary, the particular CrMnNi stainless steel is introduced as a novel alloy design for AM because it addresses current material-related issues inherent in layer-wise technologies and potentially further contributes to the exploitation of the full potential of AM.
This thesis analyzes the motivation and performance of 403 acquisitions made by emerging multinational corporations (EMNCs) in Western Europe and North America between 1994 and 2013. The findings indicate that most EMNCs were motivated to acquire in order to obtain access to the upstream and downstream know-how of their target firms. In addition, the thesis' event study results demonstrate that EMNCs on average generated value for their shareholders with their acquisitions over short periods around acquisition announcement. This result is particularly significant since similar studies on buying firms from developed markets have frequently come to the conclusion that acquirers destroy shareholder value.
As the editors note in their introduction, the attention to rights in forestry differs from 'rights-based approaches' in international development and other natural resource fields in three critical ways. First, redistribution is a central demand of activists in forestry but not in other fields. Many forest rights activists call for not only the redirection of forest benefits but also the redistribution of forest tenure to redress historical inequalities. Second, the rights agenda in forestry emerges from numerous grassroots initiatives, setting forest-related human rights apart from approaches that derive legitimacy from transnational human rights norms and are driven by international and national organizations. Third, forest rights activists attend to individual as well as peoples' collective rights whereas approaches in other fields tend to emphasize one or the other set of rights.
The Evolutionary Ecology of Invasive Species offers new insights into the mechanisms that underlie rapid evolution in these species. The book provides a comprehensive overview of achievements in the field during the boom of information over the past two decades and includes discussions of possible future directions for the study of evolution in invasive species. Written by an international expert in invasion ecology, population genetics, and evolutionary biology, the book explores the roles of preadaptation, phenotypic plasticity, selection, and stochastic processes in driving rapid evolution. The book draws insights from a wide spectrum of invasive microbes, plants, and animals, covering many of the planet’s biogeographic regions and discusses the evolutionary consequences for native species in response to biological invasions. A valuable resource to researchers and students in evolutionary biology, invasive species biology, and global change biology, this text suggests future research directions related to the evolutionary biology, impacts, and management of invasive species. Highlights the most recent advances and developments in using evolutionary principles to study and manage invasive species Offers new and often overlooked insights in processes that govern rapid evolution Discusses key stages of population demography that underlie rapid evolutionary change in invasive species, including their introduction, naturalisation, and dispersal
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