493 resultados para Hagen


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Top Row: Mei-Ling Lin, Karen S. Hagen, Mary Ann Rickelmann, Kathryn E. Echulte, Julianne M. Shea, Gloria J. George, Susan A. Wintermeyer

Row 2: Denise M. Yurik, Rebecca E. Jackson

Row 3: Mary J Barry, Ellen D. Nichols, Dorothy M. O'Connor, Anne F. Darga, Doris R. Grinspun, Suzanne M. Hurd, Christine M. Olree

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Mode of access: Internet.

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Does not contain the melodies.

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Mode of access: Internet.

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Bd. 2: 2. Aufl.

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Thesis (doctoral)--Konigliche Friedrich-Alexanders-Unversitat zu Erlangen, 1892.

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Includes bibliographies.

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Thesis (doctoral)--Universitat Rostock, 1906.

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Mode of access: Internet.

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1. Bd. Tristan und Isolde mit Ulrichs von Turheim Fortsetzung.--2. Bd. Heinrichs von Friberg Fortsetzung von Gottfrieds Tristan. Gottfrieds Minnelieder. Die alten französischen, englischen, wallisischen und spanischen Gedichte von Tristan und Isolde.

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We motivate and study the robustness of fairness notions under refinement of transitions and places in Petri nets. We show that the classical notions of weak and strong fairness are not robust and we propose a hierarchy of increasingly strong, refinement-robust fairness notions. That hierarchy is based on the conflict structure of transitions, which characterizes the interplay between choice and synchronization in a fairness notion. Our fairness notions are defined on non-sequential runs, but we show that the most important notions can be easily expressed on sequential runs as well. The hierarchy is further motivated by a brief discussion on the computational power of the fairness notions.

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Leaf colour change is commonly observed in temperate deciduous forests in autumn. This is not simply a side effect of leaf senescence, and, in the past decade, several hypotheses have emerged to explain the evolution of autumn colours. Yet a lack of crosstalk between plant physiologists and evolutionary ecologists has resulted in slow progress, and so the adaptive value of this colour change remains a mystery. Here we provide an interdisciplinary summary of the current body of knowledge on autumn colours, and discuss unresolved issues and future avenues of research that might help reveal the evolutionary meaning of this spectacle of nature.

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The metabolic rate of organisms may either be viewed as a basic property from which other vital rates and many ecological patterns emerge and that follows a universal allometric mass scaling law; or it may be considered a property of the organism that emerges as a result of the organism's adaptation to the environment, with consequently less universal mass scaling properties. Data on body mass, maximum ingestion and clearance rates, respiration rates and maximum growth rates of animals living in the ocean epipelagic were compiled from the literature, mainly from original papers but also from previous compilations by other authors. Data were read from tables or digitized from graphs. Only measurements made on individuals of know size, or groups of individuals of similar and known size were included. We show that clearance and respiration rates have life-form-dependent allometries that have similar scaling but different elevations, such that the mass-specific rates converge on a rather narrow size-independent range. In contrast, ingestion and growth rates follow a near-universal taxa-independent ~3/4 mass scaling power law. We argue that the declining mass-specific clearance rates with size within taxa is related to the inherent decrease in feeding efficiency of any particular feeding mode. The transitions between feeding mode and simultaneous transitions in clearance and respiration rates may then represent adaptations to the food environment and be the result of the optimization of tradeoffs that allow sufficient feeding and growth rates to balance mortality.