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Wie kaum eine andere soziale Bewegung der letzten 25 Jahre erfuhren die Zapatisten eine weltweite, breite Rezeption. Von der medialen Präsenz der 1990er Jahre ist jedoch nicht viel übrig geblieben. Um die mexikanischen Guerillas ist es ruhig geworden. Wurden die Zapatistas vom Zeitgeist überholt? Verloren ihre postneoliberalen Ansätze durch den Wandel der Bewegung an Attraktivität? Das Papier geht den Ursprüngen der indigenen Aufstandsbewegung und deren Paradigmenwechsel nach und zeigt auf, wie trotz des neu eingeschlagenen Weges der antisystemische und antietatistische Charakter der Bewegung beibehalten wurde.
Inhalt:
- Michael Zeuske: Humboldt en Cuba, 1800/1801 y 1804. Huellas de un enigma
- Reinaldo Funes Monzote: El cambio socio-ambiental en Cuba a fines del siglo XVIII e inicios del XIX. Impresiones y legado de Alejandro Humboldt
- Segundo E. Moreno Yánez, Christiana Borchart de Moreno: Los Andes ecuatoriales: entre la estética y la ciencia. Las catorce láminas relativas al Ecuador en la obra “Vues des Cordillères et Monuments des Peuples Indigènes de l’Amérique” de Alexander von Humboldt
- Scarlett O’Phelan Godoy: Humboldt, el Perú y sus recursos naturales: entre la plata y el guano
- Marta Clemencia Herrera Ángel: Las ocho láminas de Humboldt sobre Colombia en Vistas de las cordilleras y monumentos de los pueblos indígenas de América (1810)
- Ulrike Leitner: Über die Quellen der mexikanischen Tafeln der „Ansichten der Kordilleren“ im Nachlass Alexander von Humboldts
- Carlos Sanhueza: “He sentido mucho no haber podido penetrar más lejos hacia el Sur”. Alexander von Humboldt y Chile.
This work describes the realization of physically crosslinked networks based on gelatin by the introduction of functional groups enabling specific supramolecular interactions. Molecular models were developed in order to predict the material properties and permit to establish a knowledge-based approach to material design. The effect of additional supramolecular interactions with hydroxyapaptite was then studied in composite materials. The calculated properties are compared to experimental results to validate the models. The models are then further used for the study of physically crosslinked networks. Gelatin was functionalized with desaminotyrosine (DAT) and desaminotyrosyl-tyrosine (DATT) side groups, derived from the natural amino acid tyrosine. These group can potentially undergo to π-π and hydrogen bonding interactions also under physiological conditions. Molecular dynamics (MD) simulations were performed on models with 0.8 wt.-% or 25 wt.-% water content, using the second generation forcefield CFF91. The validation of the models was obtained by the comparison with specific experimental data such as, density, peptide conformational angles and X-ray scattering spectra. The models were then used to predict the supramolecular organization of the polymer chain, analyze the formation of physical netpoints and calculate the mechanical properties. An important finding of simulation was that with the increase of aromatic groups also the number of observed physical netpoints increased. The number of relatively stable physical netpoints, on average zero 0 for natural gelatin, increased to 1 and 6 for DAT and DATT functionalized gelatins respectively. A comparison with the Flory-Rehner model suggested reduced equilibrium swelling by factor 6 of the DATT-functionalized materials in water. The functionalized gelatins could be synthesized by chemoselective coupling of the free carboxylic acid groups of DAT and DATT to the free amino groups of gelatin. At 25 wt.-% water content, the simulated and experimentally determined elastic mechanical properties (e.g. Young Modulus) were both in the order of GPa and were not influenced by the degree of aromatic modification. The experimental equilibrium degree of swelling in water decreased with increasing the number of inserted aromatic functions (from 2800 vol.-% for pure gelatin to 300 vol.-% for the DATT modified gelatin), at the same time, Young’s modulus, elongation at break, and maximum tensile strength increased. It could be show that the functionalization with DAT and DATT influences the chain organization of gelatin based materials together with a controlled drying condition. Functionalization with DAT and DATT lead to a drastic reduction of helical renaturation, that could be more finely controlled by the applied drying conditions. The properties of the materials could then be influenced by application of two independent methods. Composite materials of DAT and DATT functionalized gelatins with hydroxyapatite (HAp) show a drastic reduction of swelling degree. In tensile tests and rheological measurements, the composites equilibrated in water had increased Young’s moduli (from 200 kPa up to 2 MPa) and tensile strength (from 57 kPa up to 1.1 MPa) compared to the natural polymer matrix without affecting the elongation at break. Furthermore, an increased thermal stability from 40 °C to 85 °C of the networks could be demonstrated. The differences of the behaviour of the functionalized gelatins to pure gelatin as matrix suggested an additional stabilizing bond between the incorporated aromatic groups to the hydroxyapatite.
CHAMP (CHAllenging Minisatellite Payload) is a German small satellite mission to study the earth's gravity field, magnetic field and upper atmosphere. Thanks to the good condition of the satellite so far, the planned 5 years mission is extended to year 2009. The satellite provides continuously a large quantity of measurement data for the purpose of Earth study. The measurements of the magnetic field are undertaken by two Fluxgate Magnetometers (vector magnetometer) and one Overhauser Magnetometer (scalar magnetometer) flown on CHAMP. In order to ensure the quality of the data during the whole mission, the calibration of the magnetometers has to be performed routinely in orbit. The scalar magnetometer serves as the magnetic reference and its readings are compared with the readings of the vector magnetometer. The readings of the vector magnetometer are corrected by the parameters that are derived from this comparison, which is called the scalar calibration. In the routine processing, these calibration parameters are updated every 15 days by means of scalar calibration. There are also magnetic effects coming from the satellite which disturb the measurements. Most of them have been characterized during tests before launch. Among them are the remanent magnetization of the spacecraft and fields generated by currents. They are all considered to be constant over the mission life. The 8 years of operation experience allow us to investigate the long-term behaviors of the magnetometers and the satellite systems. According to the investigation, it was found that for example the scale factors of the FGM show obvious long-term changes which can be described by logarithmic functions. The other parameters (offsets and angles between the three components) can be considered constant. If these continuous parameters are applied for the FGM data processing, the disagreement between the OVM and the FGM readings is limited to \pm1nT over the whole mission. This demonstrates, the magnetometers on CHAMP exhibit a very good stability. However, the daily correction of the parameter Z component offset of the FGM improves the agreement between the magnetometers markedly. The Z component offset plays a very important role for the data quality. It exhibits a linear relationship with the standard deviation of the disagreement between the OVM and the FGM readings. After Z offset correction, the errors are limited to \pm0.5nT (equivalent to a standard deviation of 0.2nT). We improved the corrections of the spacecraft field which are not taken into account in the routine processing. Such disturbance field, e.g. from the power supply system of the satellite, show some systematic errors in the FGM data and are misinterpreted in 9-parameter calibration, which brings false local time related variation of the calibration parameters. These corrections are made by applying a mathematical model to the measured currents. This non-linear model is derived from an inversion technique. If the disturbance field of the satellite body are fully corrected, the standard deviation of scalar error \triangle B remains about 0.1nT. Additionally, in order to keep the OVM readings a reliable standard, the imperfect coefficients of the torquer current correction for the OVM are redetermined by solving a minimization problem. The temporal variation of the spacecraft remanent field is investigated. It was found that the average magnetic moment of the magneto-torquers reflects well the moment of the satellite. This allows for a continuous correction of the spacecraft field. The reasons for the possible unknown systemic error are discussed in this thesis. Particularly, both temperature uncertainties and time errors have influence on the FGM data. Based on the results of this thesis the data processing of future magnetic missions can be designed in an improved way. In particular, the upcoming ESA mission Swarm can take advantage of our findings and provide all the auxiliary measurements needed for a proper recovery of the ambient magnetic field.
The availability of large data sets has allowed researchers to uncover complex properties in complex systems, such as complex networks and human dynamics. A vast number of systems, from the Internet to the brain, power grids, ecosystems, can be represented as large complex networks. Dynamics on and of complex networks has attracted more and more researchers’ interest. In this thesis, first, I introduced a simple but effective dynamical optimization coupling scheme which can realize complete synchronization in networks with undelayed and delayed couplings and enhance the small-world and scale-free networks’ synchronizability. Second, I showed that the robustness of scale-free networks with community structure was enhanced due to the existence of communities in the networks and some of the response patterns were found to coincide with topological communities. My results provide insights into the relationship between network topology and the functional organization in complex networks from another viewpoint. Third, as an important kind of nodes of complex networks, human detailed correspondence dynamics was studied by both data and the model. A new and general type of human correspondence pattern was found and an interacting priority-queues model was introduced to explain it. The model can also embrace a range of realistic social interacting systems such as email and letter communication. My findings provide insight into various human activities both at the individual and network level. Fourth, I present clearly new evidence that human comment behavior in on-line social systems, a different type of interacting human dynamics, is non-Poissonian and a model based on the personal attraction was introduced to explain it. These results are helpful for discovering regular patterns of human behavior in on-line society and the evolution of the public opinion on the virtual as well as real society. Finally, there are conclusion and outlook of human dynamics and complex networks.
Architektur und Städtebau des Sozialismus haben nach der politischen Wende der Jahre 1989-1991 einen erheblichen Wertungswandel erfahren. Insbesondere die in industrieller Bauweise errichteten Quartiere des komplexen Wohnungsbaus, die einstmals privilegierte Wohngegenden waren, haben heute oftmals den Ruf von „Ghettos“. Die vorliegende Arbeit möchte einen Beitrag dazu leisten, dieses Bild zu korrigieren und das öffentliche Image von Plattenbausiedlungen zu verbessern. Dazu wurde anhand des ostdeutschen Plattenbaugebietes Strausberg-Hegermühle untersucht, welche Faktoren die positive Identifikation der Bewohner mit ihrem Viertel begünstigen. Ziel der Arbeit ist, damit Anregungen für die Praxis lokal engagierter Bürger, Kommunalpolitiker, Wohnungsgesellschaften und Verwaltungen zu geben. Das Wohngebiet „Hegermühle“ in der brandenburgischen Mittelstadt Strausberg wurde in den 1980er Jahren gebaut. Die Bevölkerung Hegermühles war bis 1990 stark durch Mitarbeiter des Ministeriums für Nationale Verteidigung der Deutschen Demokratischen Republik geprägt. Die Wohnungen im Viertel waren wegen ihres hohen technischen Standards begehrt. Nach dem Ende der DDR erfuhr das Viertel einen starken Wandel seiner Sozialstruktur und bekam ein Image, das zwischen den Polen „graue Schlafstadt“ und „sozialer Brennpunkt“ angesiedelt ist. In diesem Wohngebiet wurde im zweiten Halbjahr 2009 eine qualitative Untersuchung durchgeführt. Neben mehreren in Bild- und Textform dokumentierten Feldexplorationen wurde eine Reihe von Interviews mit Personen geführt, die aktuell in Hegermühle wohnen oder früher dort wohnten. Die Auswahl der Interviewpartner erfolgte nach der Methode des Theoretical Sampling (Glaser/Strauss), wobei eine möglichst große Differenzierung des Samples nach Alter, Herkunft, Geschlecht und Beruf angestrebt wurde. Die Interviews wurden nach der Methode des Problemzentrierten Interviews (Witzel) geführt und auf Grundlage des Konzepts der Grounded Theory (Glaser/Strauss) ausgewertet. Für die Arbeit wurden acht Interviews ausgewählt, in denen die Interviewten Auskunft geben über die folgenden Themen: die Umstände ihres Zuzugs nach Hegermühle, die Entwicklung des Wohngebiets seitdem, das Image Hegermühles, ihr eigenes Verhältnis zum Viertel und die Perspektiven des Wohngebiets. Als Ergebnis der Arbeit lässt sich festhalten, dass die positive Identifikation mit dem Wohngebiet am stärksten durch die problematische Sozialstruktur behindert wird, die in hohem Maße von Arbeitslosigkeit und sozialen Desintegrationserscheinungen geprägt ist. Davon abgesehen überwiegen pragmatische Kriterien bei der Bewertung des Wohngebiets. Die gute infrastrukturelle Ausstattung Hegermühles mit Einkaufs-, Betreuungs- und Erholungsmöglichkeiten wurde von allen Befragten positiv hervorgehoben. Diese Faktoren sind jedoch genau so auch in anderen Orten zu finden und damit nicht geeignet, eine Identifikation mit einem spezifischen Ort zu befördern. Von den Befragten wurde daher auch mehrfach auf das Fehlen von Merkmalen hingewiesen, die Hegermühle auszeichnen und es von anderen Vierteln abheben. Dagegen war die Lokalidentität bei den Interviewpartnern am stärksten, die den Aufbau Hegermühles in den 1980er Jahren persönlich miterlebt haben. Die Arbeit schließt darum mit Überlegungen, wie diese Erfahrung einer Ortsgeschichte, die Bedeutung für die eigene Biografie hat, anderen Einwohnern vermittelt werden kann. Zwei mögliche Konzepte werden vorgeschlagen: a) die Erforschung und Vermittlung der Wohngebietsgeschichte, sowie b) die Schaffung und Pflege räumlicher Identifikationspunkte, die die lokale Geschichte, Landschaft und andere Besonderheiten des Viertels im Alltag erfahrbar machen. Beispielsweise können Kunstwerke im öffentlichen Raum oder Gedenktafeln als Anknüpfungspunkte einer ortsbezogenen Identität dienen und ein Gefühl persönlicher Verbundenheit mit dem Wohnort bestärken. Damit könnte unabhängig von pragmatischen Faktoren eine Bindung an den Ort begünstigt und die Bereitschaft der Einwohner erhöht werden, sich für die Verbesserung der Verhältnisse im Wohngebiet einzusetzen.
This thesis presents methods, techniques and tools for developing three-dimensional representations of tactical intelligence assessments. Techniques from GIScience are combined with crime mapping methods. The range of methods applied in this study provides spatio-temporal GIS analysis as well as 3D geovisualisation and GIS programming. The work presents methods to enhance digital three-dimensional city models with application specific thematic information. This information facilitates further geovisual analysis, for instance, estimations of urban risks exposure. Specific methods and workflows are developed to facilitate the integration of spatio-temporal crime scene analysis results into 3D tactical intelligence assessments. Analysis comprises hotspot identification with kernel-density-estimation techniques (KDE), LISA-based verification of KDE hotspots as well as geospatial hotspot area characterisation and repeat victimisation analysis. To visualise the findings of such extensive geospatial analysis, three-dimensional geovirtual environments are created. Workflows are developed to integrate analysis results into these environments and to combine them with additional geospatial data. The resulting 3D visualisations allow for an efficient communication of complex findings of geospatial crime scene analysis.
STG decomposition is a promising approach to tackle the complexity problems arising in logic synthesis of speed independent circuits, a robust asynchronous (i.e. clockless) circuit type. Unfortunately, STG decomposition can result in components that in isolation have irreducible CSC conflicts. Generalising earlier work, it is shown how to resolve such conflicts by introducing internal communication between the components via structural techniques only.
In 1915, Alfred Wegener published his hypotheses of plate tectonics that revolutionised the world for geologists. Since then, many scientists have studied the evolution of continents and especially the geologic structure of orogens: the most visible consequence of tectonic processes. Although the morphology and landscape evolution of mountain belts can be observed due to surface processes, the driving force and dynamics at lithosphere scale are less well understood despite the fact that rocks from deeper levels of orogenic belts are in places exposed at the surface. In this thesis, such formerly deeply-buried (ultra-) high-pressure rocks, in particular eclogite facies series, have been studied in order to reveal details about the formation and exhumation conditions and rates and thus provide insights into the geodynamics of the most spectacular orogenic belt in the world: the Himalaya. The specific area investigated was the Kaghan Valley in Pakistan (NW Himalaya). Following closure of the Tethyan Ocean by ca. 55-50 Ma, the northward subduction of the leading edge of India beneath the Eurasian Plate and subsequent collision initiated a long-lived process of intracrustal thrusting that continues today. The continental crust of India – granitic basement, Paleozoic and Mesozoic cover series and Permo-Triassic dykes, sills and lavas – has been buried partly to mantle depths. Today, these rocks crop out as eclogites, amphibolites and gneisses within the Higher Himalayan Crystalline between low-grade metamorphosed rocks (600-640°C/ ca. 5 kbar) of the Lesser Himalaya and Tethyan sediments. Beside tectonically driven exhumation mechanisms the channel flow model, that describes a denudation focused ductile extrusion of low viscosity material developed in the middle to lower crust beneath the Tibetan Plateau, has been postulated. To get insights into the lithospheric and crustal processes that have initiated and driven the exhumation of this (ultra-) high-pressure rocks, mineralogical, petrological and isotope-geochemical investigations have been performed. They provide insights into 1) the depths and temperatures to which these rocks were buried, 2) the pressures and temperatures the rocks have experienced during their exhumation, 3) the timing of these processes 4) and the velocity with which these rocks have been brought back to the surface. In detail, through microscopical studies, the identification of key minerals, microprobe analyses, standard geothermobarometry and modelling using an effective bulk rock composition it has been shown that published exhumation paths are incomplete. In particular, the eclogites of the northern Kaghan Valley were buried to depths of 140-100 km (36-30 kbar) at 790-640°C. Subsequently, cooling during decompression (exhumation) towards 40-35 km (17-10 kbar) and 630-580°C has been superseded by a phase of reheating to about 720-650°C at roughly the same depth before final exhumation has taken place. In the southern-most part of the study area, amphibolite facies assemblages with formation conditions similar to the deduced reheating phase indicate a juxtaposition of both areas after the eclogite facies stage and thus a stacking of Indian Plate units. Radiometric dating of zircon, titanite and rutile by U-Pb and amphibole and micas by Ar-Ar reveal peak pressure conditions at 47-48 Ma. With a maximum exhumation rate of 14 cm/a these rocks reached the crust-mantle boundary at 40-35 km within 1 Ma. Subsequent exhumation (46-41 Ma, 40-35 km) decelerated to ca. 1 mm/a at the base of the continental crust but rose again to about 2 mm/a in the period of 41-31 Ma, equivalent to 35-20 km. Apatite fission track (AFT) and (U-Th)/He ages from eclogites, amphibolites, micaschists and gneisses yielded moderate Oligocene to Miocene cooling rates of about 10°C/Ma in the high altitude northern parts of the Kaghan Valley using the mineral-pair method. AFT ages are of 24.5±3.8 to 15.6±2.1 Ma whereas apatite (U-Th)/He analyses yielded ages between 21.0±0.6 and 5.3±0.2 Ma. The southern-most part of the Valley is dominated by younger late Miocene to Pliocene apatite fission track ages of 7.6±2.1 and 4.0±0.5 Ma that support earlier tectonically and petrologically findings of a juxtaposition and stack of Indian Plate units. As this nappe is tectonically lowermost, a later distinct exhumation and uplift driven by thrusting along the Main Boundary Thrust is inferred. A multi-stage exhumation path is evident from petrological, isotope-geochemical and low temperature thermochronology investigations. Buoyancy driven exhumation caused an initial rapid exhumation: exhumation as fast as recent normal plate movements (ca. 10 cm/a). As the exhuming units reached the crust-mantle boundary the process slowed down due to changes in buoyancy. Most likely, this exhumation pause has initiated the reheating event that is petrologically evident (e.g. glaucophane rimmed by hornblende, ilmenite overgrowth of rutile). Late stage processes involved widespread thrusting and folding with accompanied regional greenschist facies metamorphism, whereby contemporaneous thrusting on the Batal Thrust (seen by some authors equivalent to the MCT) and back sliding of the Kohistan Arc along the inverse reactivated Main Mantle Thrust caused final exposure of these rocks. Similar circumstances have been seen at Tso Morari, Ladakh, India, 200 km further east where comparable rock assemblages occur. In conclusion, as exhumation was already done well before the initiation of the monsoonal system, climate dependent effects (erosion) appear negligible in comparison to far-field tectonic effects.
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(2010)
Seit seiner berühmt-berüchtigten Friedenspreisrede von 1998 nimmt die Anzahl der literaturwissenschaftlichen und -politischen Publikationen, die Martin Walsers Werk eine nationalistische und antisemitische Tendenz unterstellen, zu. Bisweilen wird Walser unterstellt, er suche über die Ausschließung des Jüdischen das Nationale zu stärken und behaupte die Unversöhnlichkeit von Tätergemeinschaft und Opfergemeinschaft nach 1945. Das bislang in der Forschung wenig beachtete Hörspiel "Das Gespenst von Gattnau" lässt die Annahme einer anderen Tendenz zu: die Tendenz zur Versöhnung.