Universität Stuttgart
Permanent URI for this communityhttps://elib.uni-stuttgart.de/handle/11682/1
Browse
4612 results
Search Results
Item Open Access Königslandschaft, Herzogtum oder fürstlicher Territorialstaat : zu den Zielen und Ergebnissen der Territorialpolitik Rudolfs von Habsburg im schwäbisch-nordschweizerischen Raum(1993) Quarthal, FranzHier sollen Ziele und Ergebnisse der Territorialpolitik Rudolfs von Habsburg im schwäbisch-nordschweizerischen Raum unter den Aspekten Königslandschaft, Herzogtum oder fürstlicher Territorialstaat untersucht und dabei nach Traditionen, Brüchen und Neuansätzen in Rudolfs Politik gefragt werden.Item Open Access Synthese und Struktur des Tetra(tert-butyl)tetrarsetans und des Tetra(tert-butyl)tetrastibetans (Element-Element-Bindungen ; 1)(1982) Mundt, Otto; Becker, Gerd; Wessely, Hans-Jürgen; Breunig, Hans Joachim; Kischkel, HelmutDilithium-(tert-butyl)arsenid reagiert mit (tert-Butyl)dichlorarsan zum Tetra(tert-butyl)tetrarsetan 1; das homologe Tetrastibetan 2 bildet sich bei der Reduktion von (tert-Butyl)dichlorstiban mit Magnesium. Die isotypen Verbindungen kristallisieren monoklin in der Raumgruppe P21/c mit Z = 4. Die bei der Meßtemperatur von -45 ± 5°C bestimmten Gitterkonstanten von 1/2 sind: a = 957,4(8)/1 000,2(3); b = 1 399,1(14)/1 423,9(4); c = 1 697,4(9)/1 749,8(7) pm; β = 96,02(6)/96,77(3)°. Nach den Ergebnissen der Röntgenstrukturanalysen (3 531/3 232 symmetrieunabhängige Reflexe, Rg = 4,0/4,6%) sind die E4-Ringe (E = As, Sb) gefaltet; die voluminösen organischen Substituenten stehen pseudo-äquatorial in der all-trans-Konfiguration.Item Open Access Investigation of the dynamic system behaviour of pump cases(1993) Heisel, Uwe; Fiebig, WieslawHydraulic pumps convert mechanical power into hydraulic fluid power. During this process, alternating forces in hydraulic pumps incite vibrations in the pump case and are responsible for the structure-borne noise. Mainly dynamic forces in bearings are the source causing structure-borne noise which generates finally air-borne noise. For this reason, those dynamic forces have been investigated based on a dynamical model. The structure borne noise has been measured on the pump case surface. The natural vibrations of the pump case have been determined by the Finite Element Method for several boundary conditions. The comparison between calculated and measured natural vibrations indicates that the coupling of the pump parts influences the dynamic behaviour of the case.Item Open Access A combined distance and surface profile measurement system for industrial applications : a european project(1994) Docchio, Franco; Perini, Umberto; Tiziani, Hans J.The paper reports the design, development and characterization of an electrooptical equipment suitable for distance measurements and three-dimensional gauging of surfaces of industrial interest. The equipment comprises a dual-wavelength heterodyne interferometer for absolute distance measurements with a range of 20 m and an accuracy of 0.1 mm, that is integrated with a macroscopic scale, adaptive profilometer for threedimensional measurement of the shape to 1 mm. The performance of the equipment is well suited for effective operation in industrial metrology. The equipment has been developed by three partners, namely the Dipartimento di Elettronica per I’Automarione of the University of Brescia, the Sezione Diagnostica Elettroottica of ClSE, Milan, and the lnstitut for technische Optik of the University of Stuttgart, in the framework of a European Project partially funded by the Community Bureau of Reference.Item Open Access Post-processing tools for nonlinear fe analysis of concrete structures(1990) Cervenka, Vladimir; Pukl, Radomir; Eligehausen, RolfFinite clement analysis of the cracking process in concrete structures brings new requirements for the post-processing environment. Crack direction and location are important for identification of the failure mode. The problem have been solved in the finite element program SBETA which was developed by the authors for simulation of the failure processes in reinforced concrete structures. The post-processing system creates the graphical images of crack patterns. Graphical sequences for simulation can be generated.Item Open Access Ausbreitungsmechanismen(1993) Kull, UlrichEine Population einer Art lebt zu einem vorgegebenen Zeitpunkt in einem bestimmten Lebensgebiet, dem Areal dieser Population. Infolge einer Zunahme der Populationsgröße oder auch aus umweltbedingten Gründen wie z.B. Veränderungen klimatischer Faktoren, Zerstörung von Lebensraum, kann es zu einer Ausbreitung oder Wanderung kommen. Der Ausbreitung dienen verschiedene Ausbreitungsmechanismen, die insbesondere bei festsitzenden Lebewesen von großer Bedeutung sind.Item Open Access Invariante Konstruktion der Geometrie einer Hyperfläche in einem konformen Raum(1991) Akivis, M. A.; Pertschi, Ottmar (Übersetzer)A partly expository paper on conformal differential geometry of a hypersurface. The first three sections are introductory and are devoted to multispherical coordinate representation and the study of the subgroups of the conformal group leaving the surface element invariant. In the next four sections is given an invariant construction of the theory by means of the stationary subgroups associated with the hypersurface. By this means it is possible to introduce conformal tensors gij, aij, cij and Bk = bijkaij which determine the hypersurface within a conformal mapping. The remainder of the paper is devoted to some special problems dealing with the order of contact of certain cyclides with the hypersurface, particularly for the critical cases of the envelopping space being of 3 and 4 dimensions.Item Open Access Modellreaktionen zur elektrophilen Substitution an Aromaten(1972) Effenberger, FranzAls Modellverbindungen zum Studium elektrophiler Aromatenreaktionen sind symmetrische Triaminobenzole besonders geeignet; der kumulierte positiv-elektromere Einfluß dreier zueinander meta-ständiger Dialkylaminogruppen vermag kationische Zwischenstufen soweit zu stabilisieren, daß Teilschritte der elektrophilen Substitution getrennt untersucht werden können.Item Open Access Bessere Nutzung von Bearbeitungszentren durch flexible Automatisierung(1984) Heisel, UweTechnische und organisatorische Mittel zur Automatisierung des Fertigungsablaufs bei wechselnden Losgrößen bis herunter zur Einzelfertigung werden vorgestellt. Sie wurden durch die Mikroelektronik und integrierte Datenverarbeitung ermöglicht. Werkzeug- und Werkstückversorgung sowie die individuellen Arbeitsabläufe werden rechnergesteuert. So ist eine bedienlose Schicht über Pausen hinweg und in der dritten Schicht möglich. Das modulare System für Maschinen und Steuerungen ermöglicht einen schrittweisen Ausbau.Item Open Access Differential patterns of dynamic cardiovascular regulation as a function of task(1993) Hurwitz, Barry E.; Nelesen, Richard A.; Saab, Patrice G.; Nagel, Joachim H.; Spitzer, Susan B.; Gellman, Marc D.; McCabe, Philip M.; Phillips, Donna J.; Schneiderman, NeilIn cardiovascular reactivity studies, interpretations of the processes supporting the blood pressure response may become problematic when systolic blood pressure, diastolic blood pressure, and heart rate all increase in response to a behavioral challenge. Therefore, in addition to evaluating these cardiovascular responses, this study examined cardiac output, total peripheral resistance and systolic time intervals derived from impedance cardiogram, electrocardiogram and phonocardiogram recordings during a speech Stressor, a mirror tracing task, and a foot cold pressor test. All of the behavioral Stressors elicited increases in blood pressure and heart rate, with the largest changes occurring during the overt speech. Based on the examination of the response patterns of the underlying hemodynamic variables it would appear that, in both men and women, the blood pressure increase during the speech preparation period was supported by increased cardiac output; the speech itself resulted in a mixed pattern of increased cardiac output and total peripheral resistance; whereas, the mirror tracing and cold pressor tasks produced increased total peripheral resistance. Although men and women produced similar response patterns to the behavioral challenges, sex differences in the estimates of myocardial contractility were observed during rest. These results provide evidence that different behavioral stressors can produce a distinct yet integrated pattern of responses, whose differences may be revealed, when impedance cardiography is used, to derive sufficient response measures for assessing dynamic cardiovascular processes.