Observer-based monitors and distributed wave controllers for electromechanical disturbances in power systems

Thesis (Ph. D.)--Massachusetts Institute of Technology, Dept. of Electrical Engineering and Computer Science, 2004.This electronic version was submitted by the student author. The certified thesis is available in the Institute Archives and Special Collections.Includes bibliographical references (p. 242-246).by Ernst Scholtz.Ph.D

Unique establishment of procephalic head segments is supported by the identification of cis-regulatory elements driving segment-specific segment polarity gene expression in Drosophila

Anterior head segmentation is governed by different regulatory mechanisms than those that control trunk segmentation in Drosophila. For segment polarity genes, both initial mode of activation as well as cross-regulatory interactions among them differ from the typical genetic circuitry in the trunk and are unique for each of the procephalic segments. In order to better understand the segment-specific gene network responsible for the procephalic expression of the earliest active segment polarity genes wingless and hedgehog, we started to identify and analyze cis-regulatory DNA elements of these genes. For hedgehog, we could identify a cis-regulatory element, ic-CRE, that mediates expression specifically in the posterior part of the intercalary segment and requires promoter-specific interaction for its function. The intercalary stripe is the last part of the metameric hedgehog expression pattern that appears during embryonic development, which probably reflects the late and distinct establishment of this segment. The identification of a cis-regulatory element that is specific for one head segment supports the mutant-based observation that the expression of segment polarity genes is governed by a unique gene network in each of the procephalic segments. This provides further indication that the anterior-most head segments represent primary segments, which are set up independently, in contrast to the secondary segments of the trunk, which resemble true repetitive units

Figure 9: Aspects of ultimate legs during courtship behavior.

The arthropodium is the key innovation of arthropods. Its various modifications are the outcome of multiple evolutionary transformations, and the foundation of nearly endless functional possibilities. In contrast to hexapods, crustaceans, and even chelicerates, the spectrum of evolutionary transformations of myriapod arthropodia is insufficiently documented and rarely scrutinized. Among Myriapoda, Chilopoda (centipedes) are characterized by their venomous forcipules—evolutionarily transformed walking legs of the first trunk segment. In addition, the posterior end of the centipedes’ body, in particular the ultimate legs, exhibits a remarkable morphological heterogeneity. Not participating in locomotion, they hold a vast functional diversity. In many centipede species, elongation and annulation in combination with an augmentation of sensory structures indicates a functional shift towards a sensory appendage. In other species, thickening, widening and reinforcement with a multitude of cuticular protuberances and glandular systems suggests a role in both attack and defense. Moreover, sexual dimorphic characteristics indicate that centipede ultimate legs play a pivotal role in intraspecific communication, mate finding and courtship behavior. We address ambiguous identifications and designations of podomeres in order to point out controversial aspects of homology and homonymy. We provide a broad summary of descriptions, illustrations, ideas and observations published in past 160 years, and propose that studying centipede ultimate legs is not only essential in itself for filling gaps of knowledge in descriptive morphology, but also provides an opportunity to explore diverse pathways of leg transformations within Myriapoda

Modelling for control of a Steckel hot rolling mill

Please read the abstract in the section 00front of this documentDissertation (M Eng (Electronic Engineering))--University of Pretoria, 2007.Electrical, Electronic and Computer Engineeringunrestricte

Analysis of the selective laser sintering of steel for rapid prototyping parts manufacturing

M.Ing.The principle of the laser sintering process as applied to stainless steel powder for rapid prototyping is discussed. This work attempts to present and explain the process-modelling concept with respect to potential analytical and empirical relationships between the input and output parameters. It considers aspects related to process behavior, material characteristics, laser parameters and product accuracy. A comprehensive experimental set- up with empirical results is presented

D. Georg. Ern. Stahlii ... Fundamenta chymico-pharmaceutica generalia. Accessit Manuductio ad Enchirises artis pharmaceutica specialis cura Beniamin Roth-Scholtzii

Editio ceteris emendatiorProviene del Departamento de Historia de la FarmaciaEnc. Perg.Sign.: A-Y8Con portadilla propia: "Conspectus formularum medicarum : exhibens tabulis XVI ... e praxi Stahliana ... / auctore D. Joanne Junckero", y D. Georg. Ern. Stahlii ... Fundamenta chymico-pharmaceutica generalia. Accessit Manuductio ad Enchirises artis pharmaceutica specialis / cura Beniamin Roth-Scholtzi

Pharmacopeia Bateana seu Pharmaca e praxi Georgii Batei ... excerpta : cum viribus & dosibus annexis : nec non Arcana Goddardiana & orthonia medicorum observata ... : cum indice morborum curationum.

Sign: A-O8, a4, A-N8, O4, A-C8.Cada parte con port., pag. y sign. propias.Conspectus formularum medicarum : exhibens tabulis XVI ... e praxi Stahliana ... / auctore D. Joanne Junckero. -- Venetiis : Jo. Gabrielem Hertz, 1741, VIII, 214 p., [2] en bl. -- D. Georg. Ern. Stahlii ... Fundamenta chymico-pharmaceutica generalia. Accessit Manuductio ad Enchirises artis pharmaceutica specialis / cura Beniamin Roth-Scholtzii. -- Venetiis : Jo. Gabrielem Hertz, 1741, 48 p