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Institute
- Institut für Biochemie und Biologie (162)
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- Institut für Chemie (95)
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- Institut für Physik und Astronomie (90)
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Le possiblili vite di un artista : Andrea De Carlo e la varietá delle sue alteritá immaginate
(2010)
Physikalisches Wissen und ästhetische Darstellung in Sur les nuages (1888) von Guy de Maupassant
(2010)
Einleitung
(2010)
We investigate the large-scale oceanic features determining the future ice shelf-ocean interaction by analyzing global warming experiments in a coarse resolution climate model with a comprehensive ocean component. Heat and freshwater fluxes from basal ice shelf melting (ISM) are parameterized following Beckmann and Goosse [Ocean Model 5(2):157-170, 2003]. Melting sensitivities to the oceanic temperature outside of the ice shelf cavities are varied from linear to quadratic (Holland et al. in J Clim 21, 2008). In 1% per year CO2-increase experiments the total freshwater flux from ISM triples to 0.09 Sv in the linear case and more than quadruples to 0.15 Sv in the quadratic case after 140 years at which 4 x 280 ppm = 1,120 ppm was reached. Due to the long response time of subsurface temperature anomalies, ISM thereafter increases drastically, if CO2 concentrations are kept constant at 1,120 ppm. Varying strength of the Antarctic circumpolar current (ACC) is crucial for ISM increase, because southward advection of heat dominates the warming along the Antarctic coast. On centennial timescales the ACC accelerates due to deep ocean warming north of the current, caused by mixing of heat along isopycnals in the Southern Ocean (SO) outcropping regions. In contrast to previous studies we find an initial weakening of the ACC during the first 150 years of warming. This purely baroclinic effect is due to a freshening in the SO which is consistent with present observations. Comparison with simulations with diagnosed ISM but without its influence on the ocean circulation reveal a number of ISM-related feedbacks, of which a negative ISM-feedback, due to the ISM-related local oceanic cooling, is the dominant one.
The 8.2 ka event : abrupt transition of the subpolar gyre toward a modern North Atlantic circulation
(2010)
Climate model simulations of the 8.2 ka event show an abrupt strengthening of the Atlantic subpolar gyre that allows us to connect two major but apparently contradictory climate events of the early Holocene: the freshwater outburst from proglacial lakes and the onset of Labrador Sea water formation. The 8.2 ka event is the largest climatic signal of our present interglacial with a widespread cooling in the North Atlantic region about 8200 years before present. It coincides with a meltwater outburst from North American proglacial lakes that is believed to have weakened the Atlantic meridional overturning circulation and northward heat transport, followed by a recovery of the deep ocean circulation and rising temperatures after a few centuries. Marine proxy data, however, date the onset of deep water formation in Labrador Sea to the same time. The subsequent strengthening of the slope current system created a regional signal recorded as an abrupt and persistent surface temperature decrease. Although similarities in timing are compelling, a mechanism to reconcile these apparently contradictory events was missing. Our simulations show that an abrupt and persistent strengthening of the Atlantic subpolar gyre provides a plausible explanation. The intense freshwater pulse triggered a transition of the gyre circulation into a different mode of operation, stabilized by internal feedbacks and persistent after the cessation of the perturbation. As a direct consequence, deep water formation around its center intensifies. This corresponds to the modern flow regime and stabilizes the meridional overturning circulation, possibly contributing to the Holocene's climatic stability.
Ausgehend von der These, dass kommunale Unternehmen gerade in strukturschwachen Regionen eine besondere politische und wirtschaftliche Bedeutung besitzen, wird die Entwicklung der kommunalen Wirtschaft im Land Brandenburg untersucht. Die Autoren bereiten dazu in einer Längsschnittanalyse nicht unmittelbar dazu abrufbare Daten der öffentlichen Statistik auf und untersetzen die statistische Analyse durch eine Einzelfallstudie. Im Ergebnis wird deutlich, dass Entscheidungen über Privatisierungen oder Kommunalisierungen keinen „Sachgesetzlichkeiten“ folgen, sondern politisch in Abhängigkeit von Situationsinterpretationen, Denkstilen, Macht- und Interessenkonstellationen getroffen werden. Die Offenheit der Entscheidung über die Zukunft der kommunalen Wirtschaft verweist damit auf politischen Handlungsspielraum und die politische Verantwortung für Ausbau, Erhalt oder Privatisierung kommunaler Unternehmen.
We have studied I lie thermal behavior of amphiphilic, symmetric triblock copolymers having short, deuterated polystyrene (PS) end blocks and a large poly(N-isopropylacrylarnicle) (PNIPAM) middle block exhibiting a lower critical solution temperature (LCST) in aqueous solution. A wide range of concentrations (0.1-300 mg/mL) is investigated using it number of analytical methods such as fluorescence correlation spectroscopy (FCS), turbidimetry, dynamic light scattering (DLS), small-angle neutron scattering (SANS), and neutron spin-echo spectroscopy (NSE). The critical micelle concentration is determined using FCS to be 1 mu M or less. The collapse of the micelles at the LCST is investigated using turbidimetry and DLS and shows a weak dependence on the degree of polymerization of the PNIPAM block. SANS with contrast matching allows its to reveal the core-shell Structure of the micelles as well as their correlation as a function of temperature. The segmental dynamics of the PNIPAM shell are studied as a function of temperature and arc found to be faster in the collapsed state than in the swollen state. The mode detected has a linear dispersion in q(2) and is found to be faster in the collapsed state as compared to the swollen state. We attribute this result to the averaging over mobile and immobilized segments.
Several series of symmetrical triblock copolymers were synthesized by the reversible addition fragmentation chain transfer method. They consist of a long block of poly(N-isopropylacrylamide) as hydrophilic, thermoresponsive middle block, which is end-capped by two small strongly hydrophobic blocks made from five different vinyl polymers. The association of the amphiphilic polymers was studied in dilute and concentrated aqueous solution. The polymer micelles found at low concentrations form hydrogels at high concentrations, typically above 30-35 wt.%. Hydrogel formation and the thermosensitive rheological behavior were studied exemplarily for copolymers with hydrophobic blocks of polystyrene, poly(2-ethylhexyl acrylate), and poly(n-octadecyl acrylate). All systems exhibited a cloud point around 30 A degrees C. Heating beyond the cloud point initially favors hydrogel formation but continued heating results in macroscopic phase separation. The rheological behavior suggests that the copolymers associate into flower-like micelles, with only a small share of polymers that bridge the micelles and act as physical cross-linkers, even at high concentrations.
Isaac Euchel
(2010)
Isaac Euchel (1756-1804) war lange Zeit einer der zu Unrecht vergessenen jüdischen Aufklärer. Das hat sich erst seit wenigen Jahren geändert: Seine bedeutende Rolle innerhalb der Haskala, der jüdischen Aufklärungsbewegung, wurde in der Forschung erkannt, seine wichtigen Schriften in hebräischer und jiddischer Sprache wiederentdeckt, übersetzt und ediert.
Euchel war ein vielseitiger Aufklärer: Er war Verleger und Kaufmann, Autor, Herausgeber und Übersetzer, schrieb in Deutsch, Hebräisch und Jiddisch; er war zugleich in der jüdischen und in der christlichen Gesellschaft zu Hause, war Student Kants und Biograph Mendelssohns. In Königsberg und Berlin wurde er zum Organisator und Vernetzer der über halb Europa verstreuten Anhänger der Haskala, die nach seiner Vorstellung durch die Erneuerung der hebräischen Sprache eine aufgeklärte und moderne jüdische Kultur hervorbringen sollte.
Anlässlich seines 250. Geburtstags trafen sich Historiker, Hebraisten, Jiddisten, Judaisten und Literaturwissenschaftler aus Deutschland, Österreich, Israel und den USA in Potsdam, um auf einer internationalen Tagung unter dem Titel »Vom Nutzen der Aufklärung oder: Woß tut me damit« sein Leben und Werk zu ehren und umfassend zu diskutieren. Der vorliegende Tagungsband bündelt die Früchte dieser Diskussionen und bietet einen Überblick über den Stand der Forschung.
Jesu Wahrnehmung im Judentum war vielgestaltig. Rabbiner Walter Homolka zeichnet eine Geschichte von Abgrenzung und Auseinandersetzung. Im 19. Jahrhundert fuehrte die "Heimholung Jesu" ins Judentum zu einer heute selbstbewussten Position. War Jesus aus juedischer Sicht Pharisaeer und Schriftgelehrter? Vielleicht. War er bedeutend? Ohne Zweifel. War er der Messias oder gar Gottes eigener Sohn? Nach juedischem Verstaendnis nein. Homolkas Buch laedt dazu ein, die zentrale Gestalt des Christentums aus der Perspektive des juedischen Glaubens zu betrachten. Besonders interessant sind die von Homolka aufgezeigten vielfaeltigen Versuche juedischer Wissenschaftler, die Lehre Jesu als "integralen Bestandteil der juedischen Tradition und Geschichte zu begreifen"; Versuche, die auch das christliche Jesus-Bild bereichern koennen - auch wenn juedisches und christliches Jesus-Bild letztlich doch auf entscheidende Weise different bleiben. (ORF Buchtipp)
Die europäische Dienstleistungsrichtlinie (Richtlinie 2006/123/EG des Europäischen Parlaments und des Rates vom 12. Dezember 2006 über Dienstleistungen im Binnenmarkt), die bis zum 28. Dezember 2009 in innerstaatliches Recht umgesetzt werden musste, stellt die Kommunen vor enorme rechtliche, verwaltungsorganisatorische und technische Herausforderungen. Zwei zentrale Anliegen der Richtlinie sind die Verpflichtung zur Einrichtung eines Einheitlichen Ansprechpartners, über den im Anwendungsbereich der Richtlinie sämtliche erforderlichen Verfahren und Formalitäten abgewickelt werden können, sowie die Gewährleistung einer elektronischen Verfahrensabwicklung. Die Entscheidung über die konkrete verwaltungsorganisatorische Verortung des Einheitlichen Ansprechpartners ist von den Bundesländern zu treffen, die dabei durchaus unterschiedliche Wege gehen. Der vorliegende Tagungsband der 15. Jahrestagung des Kommunalwissenschaftlichen Institutes (KWI) der Universität Potsdam thematisierte die Instrumente der Dienstleistungsrichtlinie, diskutierte Strategien der Umsetzung und regte damit zu einem Erfahrungsaustausch zwischen Wissenschaft und Praxis an.
Hartz IV steht als Chiffre für eine Sozialrechtsreform, mit der 2005 die Grundsicherung für Arbeitsuchende auf ein neues Fundament gestellt wurde. Die Reform war von Anbeginn umstritten. Streitpunkte waren sowohl die organisationsrechtliche Zuordnung der Trägerschaft (ARGE, Optionskommunen) als auch Voraussetzungen, Art und Höhe der Leistungen nach dem damals neuen SGB II. Inzwischen hat das Bundesverfassungsgericht die in § 44b SGB II geregelten Arbeitsgemeinschaften als verfassungswidrige Mischverwaltung eingestuft. Die Karlsruher Richter setzten dem Gesetzgeber für die Herstellung grundgesetzkonformer Zustände eine Frist längstens bis Ende 2010. Mit Gesetz zur Änderung des Grundgesetzes (Art. 91e), in Kraft getreten am 27.07.2010, hat der Gesetzgeber den Auftrag des Bundesverfassungsgerichtes umgesetzt. Die Verfassung wurde um einen neuen Artikel 91e ergänzt. Er schafft eine verfassungsrechtliche Grundlage für die Fortsetzung der Aufgabenwahrnehmung der SGB II-Leistungsträger in gemeinsamen Einrichtungen. Dadurch wird eine Ausnahme vom Verbot der Mischverwaltung für das Gebiet der Grundsicherung für Arbeitsuchende eingeführt. Nach Art. 91e Abs. 2 GG kann eine begrenzte Anzahl von kommunalen Trägern als alleinige Träger der Grundsicherung für Arbeitssuchende zugelassen werden. Die Zulassung erfolgt auf Antrag des kommunalen Trägers und bedarf der Zustimmung der obersten Landesbehörde. Doch beschränken sich die Schwierigkeiten nicht allein auf die Verwaltungsorganisation und das Organisationsrecht. Vielmehr haben sich bei der praktischen Handhabung des SGB II auch im Leistungsrecht viele Schwachstellen gezeigt. Folge davon ist eine Klagenflut bei den Sozialgerichten, in deren Urteilen manche eine Fundgrube für gesetzgeberischen Nachbesserungsbedarf sehen. Hinzu kommen Reformvorschläge aus der Politik, die bis hin zu einer Arbeitspflicht reichen. Weitere Reformimpulse gehen vom Bundesverfassungsgericht aus, das unlängst in dem zentralen Bereich der Regelleistungen verfassungswidrige Vorschriften ausgemacht und damit weit über den konkreten Einzelfall hinaus zu einer Neubestimmung sozialstaatlicher Leistungen anregt. Die 16. Fachtagung des Kommunalwissenschaftlichen Institutes (KWI) der Universität Potsdam greift die ebenso aktuellen wie brisanten Entwicklungen bei der Trägerschaft und den Leistungen der Grundsicherung für Arbeitsuchende auf.
Hartz IV im Umbruch
(2010)
I. Zankapfel „Dienstleistungsrichtlinie“ II. Regelungsmotive und Eckpunkte der Dienstleistungsrichtlinie III. Regelungsmotive und Eckpunkte des 4. VwVfÄndG IV. Ausgewählte Problemfelder der Dienstleistungsrichtlinie und ihrer Umsetzung aus kommunaler Perspektive V. Innovationsimpuls „Dienstleistungsrichtlinie“
Risk attitudes influence the complete life cycle of entrepreneurs. Whereas recent research underpins the theoretical proposition of a positive correlation between risk attitudes and the decision to become self-employed, the effects on survival are not as straightforward. Psychological research posits an inverse U-shaped relationship between risk attitudes and entrepreneurial survival. On the basis of experimentally validated data of the German Socio-Economic Panel (SOEP), we examine the extent to which risk attitudes influence survival rates in self-employment in Germany. The empirical results confirm that persons whose risk attitudes are in the medium range survive significantly longer as entrepreneurs than do persons with particularly low or high risk attitudes.
Kennen Sie Randegg?
(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.
The development of rise Cenozoic East African Rift System (EARS) profoundly re-shaped the landscape and significantly increased the amplitude of short-term environmental response to climate variation. In particular, the development of amplifier lakes in rift basins after three million years ago significantly contributed to this exceptional sensitivity of East Africa to climate change compared to elsewhere on the African continent. Amplifier lakes are characterized by tectonically-formed graben morphologies in combination with an extreme contrast between high precipitation in the elevated parts of the catchment and high evaporation in the lake area. Such amplifier lakes respond rapidly to moderate, precessional-forced climate shifts, and as they do so apply dramatic environmental pressure to the biosphere. Rift basins, when either extremely dry or lake-filled, form important barriers for migration, mixing and competition of different populations of animals and hominins. Amplifier lakes link long-term, high-amplitude tectonic processes and short-term environmental fluctuations. East Africa may have become the place where early humans evolved as a consequence of this strong link between different time scales. (C) 2010 Elsevier Ltd. All rights reserved.
Cenozoic uplift of the East African Plateau has been associated with fundamental climatic and environmental changes in East Africa and adjacent regions. While this influence is widely accepted, the timing and the magnitude of plateau uplift have remained unclear. This uncertainty stems from the lack of datable, geomorphically meaningful reference horizons that could record surface uplift. Here, we document the existence of significant relief along the East African Plateau prior to rifting, as inferred from modeling the emplacement history of one of the longest terrestrial lava flows, the similar to 300-km-long Yatta phonolite flow in Kenya. This 13.5 Ma lava flow originated on the present-day eastern Kenya Rift flank, and utilized a riverbed that once routed runoff from the eastern rim of the plateau. Combining an empirical viscosity model with subsequent cooling and using the Yatta lava flow geometry and underlying paleotopography (slope angle), we found that the prerift slope was at least 0.2 degrees, suggesting that the lava flow originated at a minimum elevation of 1400 m. Hence, high paleotopography in the Kenya Rift region must have existed by at least 13.5 Ma. We infer from this that middle Miocene uplift occurred, which coincides with the two-step expansion of grasslands, as well as important radiation and speciation events in tropical Africa.
Explaining the presence of normal faults in overall compressive settings is a challenging problem in understanding the tectonics of active mountain belts. The Himalayan-Tibetan orogenic system is an excellent setting to approach this problem because it preserves one of the most dramatic records of long-term, contemporaneous shortening and extension. Over the past decades, several studies have described extensional features, not only in the Tibetan Plateau, but also in the Himalaya. For a long time, the favored model explained the function of the Southern Tibetan detachment system, a major fault zone in the Himalaya, as a decoupling horizon between the regime of crustal shortening forming the Himalayan wedge to the south and the extensional regime of the Tibetan Plateau to the north. However, in recent years, increasing evidence has shown that N-S-trending normal faults in the Central Himalaya crosscut not only the Southern Tibetan detachment system, but also the Main Central thrust. Here, we present new structural data and geologic evidence collected within the NW Indian Himalaya and combine them with previously published seismicity data sets in order to document pervasive E-W extension accommodated along N-S-trending faults extending as far south as the footwall of the Main Central thrust. We conducted a kinematic analysis of fault striations on brittle faults, documented and mapped fault scarps in Quaternary sedimentary deposits using satellite imagery, and made field observations in the Greater Sutlej region (Spiti, Lahul, Kinnaur) and the Garhwal Himalaya. Studies of extensional features within the regionally NW- SE-trending NW Indian Himalaya provide the advantage that arc-parallel and E-W extension can be separated, in contrast to the Central Himalaya. Therefore, our observations of E-W extension in the Indian NW Himalaya are well suited to test the applicability of current tectonic models for the whole Himalaya. We favor the interpretation of E-W extension in the NW Indian Himalaya as a propagation of extension driven by collapse of the Tibetan Plateau.
The seismically active Alborz mountains of northern Iran are an integral part of the Arabia-Eurasia collision. Linked strike-slip and thrust/reverse-fault systems in this mountain belt are characterized by slow loading rates, and large earthquakes are highly disparate in space and time. Similar to other intracontinental deformation zones such a pattern of tectonic activity is still insufficiently understood, because recurrence intervals between seismic events may be on the order of thousands of years, and are thus beyond the resolution of short term measurements based on GPS or instrumentally recorded seismicity. This study bridges the gap of deformation processes on different time scales. In particular, my investigation focuses on deformation on the Quaternary time scale, beyond present-day deformation rates, and it uses present-day and paleotectonic characteristics to model fault behavior. The study includes data based on structural and geomorphic mapping, faultkinematic analysis, DEM-based morphometry, and numerical fault-interaction modeling. In order to better understand the long- to short term behavior of such complex fault systems, I used geomorphic surfaces as strain markers and dated fluvial and alluvial surfaces using terrestrial cosmogenic nuclides (TCN, 10Be, 26Al, 36Cl) and optically stimulated luminescence (OSL). My investigation focuses on the seismically active Mosha-Fasham fault (MFF) and the seismically virtually inactive North Tehran Thrust (NTT), adjacent to the Tehran metropolitan area. Fault-kinematic data reveal an early mechanical linkage of the NTT and MFF during an earlier dextral transpressional stage, when the shortening direction was oriented northwest. This regime was superseded by Pliocene to Recent NE-oriented shortening, which caused thrusting and sinistral strike-slip faulting. In the course of this kinematic changeover, the NTT and MFF were reactivated and incorporated into a nascent transpressional duplex, which has significantly affected landscape evolution in this part of the range. Two of three distinctive features which characterize topography and relief in the study area can be directly related to their location inside the duplex array and are thus linked to interaction between eastern MFF and NTT, and between western MFF and Taleghan fault, respectively. To account for inferred inherited topography from the previous dextral-transpression regime, a new concept of tectonic landscape characterization has been used. Accordingly, I define simple landscapes as those environments, which have developed during the influence of a sustained tectonic regime. In contrast, composite landscapes contain topographic elements inherited from previous tectonic conditions that are inconsistent with the regional present-day stress field and kinematic style. Using numerical fault-interaction modeling with different tectonic boundary conditions, I calculated synoptic snapshots of artificial topography to compare it with the real topographic metrics. However, in the Alborz mountains, E-W faults are favorably oriented to accommodate the entire range of NW- to NE-directed compression. These faults show the highest total displacement which might indicate sustained faulting under changing boundary conditions. In contrast to the fault system within and at the flanks of the Alborz mountains, Quaternary deformation in the adjacent Tehran plain is characterized by oblique motion and thrust and strike-slip fault systems. In this morphotectonic province fault-propagation folding along major faults, limited strike-slip motion, and en-échelon arrays of second-order upper plate thrusts are typical. While the Tehran plain is characterized by young deformation phenomena, the majority of faulting took place in the early stages of the Quaternary and during late Pliocene time. TCN-dating, which was performed for the first time on geomorphic surfaces in the Tehran plain, revealed that the oldest two phases of alluviation (units A and B) must be older than late Pleistocene. While urban development in Tehran increasingly covers and obliterates the active fault traces, the present-day kinematic style, the vestiges of formerly undeformed Quaternary landforms, and paleo earthquake indicators from the last millennia attest to the threat that these faults and their related structures pose for the megacity.
Context. Helicity is a fundamental property of magnetic fields, conserved in ideal MHD. In flux rope geometry, it consists of twist and writhe helicity. Despite the common occurrence of helical structures in the solar atmosphere, little is known about how their shape relates to the writhe, which fraction of helicity is contained in writhe, and how much helicity is exchanged between twist and writhe when they erupt. Aims. Here we perform a quantitative investigation of these questions relevant for coronal flux ropes. Methods. The decomposition of the writhe of a curve into local and nonlocal components greatly facilitates its computation. We use it to study the relation between writhe and projected S shape of helical curves and to measure writhe and twist in numerical simulations of flux rope instabilities. The results are discussed with regard to filament eruptions and coronal mass ejections (CMEs). Results. (1) We demonstrate that the relation between writhe and projected S shape is not unique in principle, but that the ambiguity does not affect low- lying structures, thus supporting the established empirical rule which associates stable forward (reverse) S shaped structures low in the corona with positive (negative) helicity. (2) Kink-unstable erupting flux ropes are found to transform a far smaller fraction of their twist helicity into writhe helicity than often assumed. (3) Confined flux rope eruptions tend to show stronger writhe at low heights than ejective eruptions (CMEs). This argues against suggestions that the writhing facilitates the rise of the rope through the overlying field. (4) Erupting filaments which are S shaped already before the eruption and keep the sign of their axis writhe (which is expected if field of one chirality dominates the source volume of the eruption), must reverse their S shape in the course of the rise. Implications for the occurrence of the helical kink instability in such events are discussed. (5) The writhe of rising loops can easily be estimated from the angle of rotation about the direction of ascent, once the apex height exceeds the footpoint separation significantly. Conclusions. Writhe can straightforwardly be computed for numerical data and can often be estimated from observations. It is useful in interpreting S shaped coronal structures and in constraining models of eruptions.
Testing magnetofrictional extrapolation with the Titov-Demoulin model of solar active regions
(2010)
We examine the nonlinear magnetofrictional extrapolation scheme using the solar active region model by Titov and Demoulin as test field. This model consists of an arched, line-tied current channel held in force-free equilibrium by the potential field of a bipolar flux distribution in the bottom boundary. A modified version with a parabolic current density profile is employed here. We find that the equilibrium is reconstructed with very high accuracy in a representative range of parameter space, using only the vector field in the bottom boundary as input. Structural features formed in the interface between the flux rope and the surrounding arcade - "hyperbolic flux tube" and "bald patch separatrix surface" - are reliably reproduced, as are the flux rope twist and the energy and helicity of the configuration. This demonstrates that force-free fields containing these basic structural elements of solar active regions can be obtained by extrapolation. The influence of the chosen initial condition on the accuracy of reconstruction is also addressed, confirming that the initial field that best matches the external potential field of the model quite naturally leads to the best reconstruction. Extrapolating the magnetogram of a Titov-Demoulin equilibrium in the unstable range of parameter space yields a sequence of two opposing evolutionary phases, which clearly indicate the unstable nature of the configuration: a partial buildup of the flux rope with rising free energy is followed by destruction of the rope, losing most of the free energy.
In the high mountains of Asia, glaciers cover an area of approximately 115,000 km² and constitute one of the largest continental ice accumulations outside Greenland and Antarctica. Their sensitivity to climate change makes them valuable palaeoclimate archives, but also vulnerable to current and predicted Global Warming. This is a pressing problem as snow and glacial melt waters are important sources for agriculture and power supply of densely populated regions in south, east, and central Asia. Successful prediction of the glacial response to climate change in Asia and mitigation of the socioeconomic impacts requires profound knowledge of the climatic controls and the dynamics of Asian glaciers. However, due to their remoteness and difficult accessibility, ground-based studies are rare, as well as temporally and spatially limited. We therefore lack basic information on the vast majority of these glaciers. In this thesis, I employ different methods to assess the dynamics of Asian glaciers on multiple time scales. First, I tested a method for precise satellite-based measurement of glacier-surface velocities and conducted a comprehensive and regional survey of glacial flow and terminus dynamics of Asian glaciers between 2000 and 2008. This novel and unprecedented dataset provides unique insights into the contrasting topographic and climatic controls of glacial flow velocities across the Asian highlands. The data document disparate recent glacial behavior between the Karakoram and the Himalaya, which I attribute to the competing influence of the mid-latitude westerlies during winter and the Indian monsoon during summer. Second, I tested whether such climate-related longitudinal differences in glacial behavior also prevail on longer time scales, and potentially account for observed regionally asynchronous glacial advances. I used cosmogenic nuclide surface exposure dating of erratic boulders on moraines to obtain a glacial chronology for the upper Tons Valley, situated in the headwaters of the Ganges River. This area is located in the transition zone from monsoonal to westerly moisture supply and therefore ideal to examine the influence of these two atmospheric circulation regimes on glacial advances. The new glacial chronology documents multiple glacial oscillations during the last glacial termination and during the Holocene, suggesting largely synchronous glacial changes in the western Himalayan region that are related to gradual glacial-interglacial temperature oscillations with superimposed monsoonal precipitation changes of higher frequency. In a third step, I combine results from short-term satellite-based climate records and surface velocity-derived ice-flux estimates, with topographic analyses to deduce the erosional impact of glaciations on long-term landscape evolution in the Himalayan-Tibetan realm. The results provide evidence for the long-term effects of pronounced east-west differences in glaciation and glacial erosion, depending on climatic and topographic factors. Contrary to common belief the data suggest that monsoonal climate in the central Himalaya weakens glacial erosion at high elevations, helping to maintain a steep southern orographic barrier that protects the Tibetan Plateau from lateral destruction. The results of this thesis highlight how climatic and topographic gradients across the high mountains of Asia affect glacier dynamics on time scales ranging from 10^0 to 10^6 years. Glacial response times to climate changes are tightly linked to properties such as debris cover and surface slope, which are controlled by the topographic setting, and which need to be taken into account when reconstructing mountainous palaeoclimate from glacial histories or assessing the future evolution of Asian glaciers. Conversely, the regional topographic differences of glacial landscapes in Asia are partly controlled by climatic gradients and the long-term influence of glaciers on the topographic evolution of the orogenic system.
Die Zuwanderung und der Integration von Zuwanderern aus den GUS-Staaten in Deutschland ist eine bedeutsame politische und rechtliche Thematik. Diese Thematik ist in Deutschland bisher noch wenig untersucht und nur in Teilbereichen bearbeitet. Deshalb untersucht das vorgestellte Werk folgende Fragen und Aspekte: Analyse der Zuwanderung aus den GUS-Staaten; Darstellung von Zuwanderungsgruppen aus den GUS-Staaten und ihres rechtlichen Status; die Wellen der Zuwanderung anhand der Zuwanderer aus den GUS-Staaten, einschließlich (Spät)Aussiedlern und jüdische Zuwanderern, tschetschenischen Asylsuchenden, Familienangehörige, Studierende, qualifizierte Arbeitskrafte usw., Analyse der Integrationsprogramme und Integrationsmaßnahmen für die Zuwanderer aus den GUS-Staaten; Darstellung der Integrationschancen und Integrationshemmnisse am Beispiel der Zuwanderer aus den GUS-Staaten, einschließlich das Recht auf Annerkennung der akademischen und beruflichen Qualifikation, das Recht auf Arbeit u.a., die russischen Rückkehr- und (Reintegrations-) Programme für die im Bundesgebiet lebenden Zuwanderer aus den GUS-Staaten – ihre Analyse und Bewertung. Eine weitere Besonderheit der Veröffentlichung besteht darin, dass die Autorin Ihre wissenschaftlichen Ausführungen zur rechtlichen Stellung der GUS-Zuwanderer und zu den Erfolgen bei ihrer Integration, aber auch zu den Integrationshemmnissen und Integrationsproblemen auf eine soziologische Befragung von Zuwanderern aus den GUS-Staaten in den Ländern Brandenburg und Berlin stützt. Die empirische Untersuchung bezieht sich auf den Zeitraum 1991 bis 2009.
Als Schnittstelle zwischen der Lokal- und der Staatsebene konnten die Landkreise ihre Stellung im politischen System Deutschlands bewahren und ausbauen. Optimierungsbedarf hat sich aufgrund des sozioökonomischen, technischen und demographischen Wandel sowie der öffentlichen Finanzkrise ergeben. Kreisgebietsreformmodelle und die Ausweitung der Aufgabenkooperation dominieren die Reformdebatte. Neben den verfassungsrechtlichen Anforderungen und der Akzeptanz der Reform bei den Betroffenen ist der Reformerfolg wesentlich von der Qualität der Umsetzungsstrategie abhängig. Der aktivierenden Einbeziehung der Mitarbeiter in den Reformprozess kommt dabei eine besondere Bedeutung zu.
Als Schnittstelle zwischen der Lokal- und der Staatsebene konnten die Landkreise ihre Stellung im politischen System Deutschlands bewahren und ausbauen. Optimierungsbedarf hat sich aufgrund des sozioökonomischen, technischen und demographischen Wandel sowie der öffentlichen Finanzkrise ergeben. Kreisgebietsreformmodelle und die Ausweitung der Aufgabenkooperation dominieren die Reformdebatte. Neben den verfassungsrechtlichen Anforderungen und der Akzeptanz der Reform bei den Betroffenen ist der Reformerfolg wesentlich von der Qualität der Umsetzungsstrategie abhängig. Der aktivierenden Einbeziehung der Mitarbeiter in den Reformprozess kommt dabei eine besondere Bedeutung zu.
Die These des Aufsatzes lautet, dass es sich bei Sebastian Brants „Narrenschiff“ um einen Text handelt, der entsprechend der Prinzipien verstanden werden kann, die Rudolf Agricola für das Sammeln von Argumenten formuliert hat. Das Gründungsdokument dieser humanistischen Methode, die unter dem Begriff der „loci communes“ Geschichte gemacht hat, ist ein Brief Agricolas aus dem Jahr 1484. Ein erster Teil des Aufsatzes stellt Agricolas Argumentationstheorie dar, ein zweiter Teil zeigt, dass Brants „Narrenschiff“ als Ergebnis dieser Argumentationstheorie verstanden werden kann.
'Gelegenheitsdichtung'
(2010)
Russian Jews who left the Former Soviet Union (FSU) and its Successor States after 1989 are considered as one of the best qualified migrants group worldwide. In the preferred countries of destination (Israel, the United States and Germany) they are well-known for cultural self-assertion, strong social upward mobility and manifold forms of self organisation and empowerment. Using Suzanne Kellers sociological model of “Strategic Elites”, it easily becomes clear that a huge share of the Russian Jewish Immigrants in Germany and Israel are part of various elites due to their qualification and high positions in the FSU – first of all professional, cultural and intellectual elites (“Intelligentsija”). The study aimed to find out to what extent developments of cultural self-assertion, of local and transnational networking and of ethno-cultural empowerment are supported or even initiated by the immigrated (Russian Jewish) Elites. The empirical basis for this study have been 35 half-structured expert interviews with Russian Jews in both countries (Israel, Germany) – most of them scholars, artists, writers, journalists/publicists, teachers, engineers, social workers, students and politicians. The qualitative analysis of the interview material in Israel and Germany revealed that there are a lot of commonalities but also significant differences. It was obvious that almost all of the interview partners remained to be linked with Russian speaking networks and communities, irrespective of their success (or failure) in integration into the host societies. Many of them showed self-confidence with regard to the groups’ amazing professional resources (70% of the adults with academic degree), and the cultural, professional and political potential of the FSU immigrants was usually considered as equal to those of the host population(s). Thus, the immigrants’ interest in direct societal participation and social acceptance was accordingly high. Assimilation was no option. For the Russian Jewish “sense of community” in Israel and Germany, Russian Language, Arts and general Russian culture have remained of key importance. The Immigrants do not feel an insuperable contradiction when feeling “Russian” in cultural terms, “Jewish” in ethnical terms and “Israeli” / “German” in national terms – in that a typical case of additive identity shaping what is also significant for the Elites of these Immigrants. Tendencies of ethno-cultural self organisation – which do not necessarily hinder impressing individual careers in the new surroundings – are more noticeable in Israel. Thus, a part of the Russian Jewish Elites has responded to social exclusion, discrimination or blocking by local population (and by local elites) with intense efforts to build (Russian Jewish) Associations, Media, Educational Institutions and even Political Parties. All in all, the results of this study do very much contradict popular stereotypes of the Russian Jewish Immigrant as a pragmatic, passive “Homo Sovieticus”. Among the Interview Partners in this study, civil-societal commitment was not the exception but rather the rule. Traditional activities of the early, legendary Russian „Intelligentsija“ were marked by smooth transitions from arts, education and societal/political commitment. There seem to be certain continuities of this self-demand in some of the Russian Jewish groups in Israel. Though, nothing comparable could be drawn from the Interviews with the Immigrants in Germany. Thus, the myth and self-demand of Russian “Intelligentsija” is irrelevant for collective discourses among Russian Jews in Germany.
Exploring the origin and fate of the Magellanic stream with ultraviolet and optical absorption
(2010)
We present an analysis of ionization and metal enrichment in the Magellanic Stream (MS), the nearest gaseous tidal stream, using Hubble Space Telescope/STIS and FUSE ultraviolet spectroscopy of two background active galactic nuclei. The targets are NGC 7469, lying directly behind the MS with log N(H I)(MS) = 18.63 +/- 0.03(stat) +/- 0.08(syst), and Mrk 335, lying 24 degrees.7 away with log N(H I)(MS) = 16.67 +/- 0.05. For NGC 7469, we include optical spectroscopy from VLT/UVES. In both sight lines, the MS is detected in low-ion (O I, C II, C III, Si II, Si III, Al II, Ca II) and high-ion (O VI, C IV, Si IV) absorption. Toward NGC 7469, we measure an MS oxygen abundance [O/H](MS) = [O I/ H I]= -1.00 +/- 0.05(stat) +/- 0.08(syst), supporting the view that the Stream originates in the Small Magellanic Cloud rather than the Large Magellanic Cloud. We use CLOUDY to model the low-ion phase of the Stream as a photoionized plasma using the observed Si III/Si II and C III/C II ratios. Toward Mrk 335, this yields an ionization parameter between log U= -3.45 and -3.15, a gas density log (n(H)/cm(-3)) between-2.51 and -2.21, and a hydrogen ionization fraction of 98.9%- 99.5%. Toward NGC 7469, we derive sub-solar abundance ratios for [Si/O], [Fe/O], and [Al/O], indicating the presence of dust in the MS. The high-ion column densities are too large to be explained by photoionization, but also cannot be explained by a single-temperature collisional ionization model (equilibrium or non-equilibrium). This suggests that the high-ion plasma is multi-phase, with an Si IV region, a hotter O VI region, and C IV potentially contributing to each. Summing over the low-ion and high-ion phases, we derive conservative lower limits on the ratio N(total H II)/N(H I) of greater than or similar to 19 toward NGC 7469 and greater than or similar to 330 toward Mrk 335, showing that along these two directions the vast majority of the Stream has been ionized. The presence of warm-hot plasma together with the small-scale structure observed at 21 cm provides evidence for an evaporative interaction with the hot Galactic corona. This scenario, predicted by hydrodynamical simulations, suggests that the fate of the MS will be to replenish the Galactic corona with new plasma, rather than to bring neutral fuel to the disk.
Am 24. und 25. Juni 2010 fand am Hasso-Plattner-Institut für Softwaresystemtechnik GmbH in Potsdam der 3. Deutsche IPv6 Gipfel 2010 statt, dessen Dokumentation der vorliegende technische Report dient. Als nationaler Arm des weltweiten IPv6-Forums fördert der Deutsche IPv6-Rat den Übergangsprozess zur neuen Internetgeneration und brachte in diesem Rahmen nationale und internationale Experten aus Wirtschaft, Wissenschaft und öffentlicher Verwaltung zusammen, um Awareness für das Zukunftsthema IPv6 zu schaffen und um ein Resumé über die bislang erzielten Fortschritte zu ziehen. Die Grenzen des alten Internetprotokolls IPv4 sind in den vergangenen zwei Jahren deutlicher denn je zutage getreten. Waren im vergangenen Jahr anlässlich des 2. IPv6 Gipfels noch 11% aller zu vergebenden IPv4 Adressen verfügbar, ist diese Zahl mittlerweile auf nur noch 6% geschrumpft. Ehrengast war in diesem Jahr der „europäische Vater“ des Internets, Prof. Peter T. Kirstein vom University College London, dessen Hauptvortrag von weiteren Beiträgen hochrangiger Vertretern aus Politik, Wissenschaft und Wirtschaft ergänzt wurde.
The statistical distribution of energies among particles responsible for long gamma-ray burst (GRB) emission is analyzed in light of recent results of the Fermi Observatory. The all-sky flux, F., recorded by the Gamma-Ray Burst Monitor (GBM) is shown, despite its larger energy range, to be not significantly larger than that reported by the Burst and Transient Explorer, suggesting a relatively small flux in the 3-30MeV energy range. The present-day energy input rate in gamma-rays recorded by the GBM from long GRBs is found, assuming star formation rates in the literature, to be W(0) = 0.5F gamma H/c = 5x10(42) erg Mpc(-3) yr(-1). The Large Area Telescope fluence, when observed, is about 5%-10% per decade of the total, in good agreement with the predictions of saturated, nonlinear shock acceleration. The high- energy component of long GRBs, as measured by Fermi, is found to contain only similar to 10-2.5 of the energy needed to produce ultrahigh-energy cosmic rays (UHECRs) above 4 EeV, assuming the latter to be extragalactic, when various numerical factors are carefully included, if the cosmic-ray source spectrum has a spectral index of -2. The observed. - ray fraction of the required UHECR energy is even smaller if the source spectrum is softer than E-2. The AMANDA II limits rule out such a GRB origin for UHECRs if much more than 10(-2) of the cosmic-ray energy goes into neutrinos that are within, and simultaneous with, the gamma-ray beam. It is suggested that "orphan" neutrinos out of the gamma-ray beam might be identifiable via orphan afterglow or other wide angle signatures of GRBs in lieu of coincidence with prompt gamma-rays, and it is recommended that feasible single neutrino trigger criteria be established to search for such coincidences.
During the last glacial period, climate records from the North Atlantic region exhibit a pronounced spectral component corresponding to a period of about 1470 years, which has attracted much attention. This spectral peak is closely related to the recurrence pattern of Dansgaard-Oeschger (DO) events. In previous studies a red noise random process, more precisely a first-order autoregressive (AR1) process, was used to evaluate the statistical significance of this peak, with a reported significance of more than 99%. Here we use a simple mechanistic two-state model of DO events, which itself was derived from a much more sophisticated ocean-atmosphere model of intermediate complexity, to numerically evaluate the spectral properties of random (i.e., solely noise-driven) events. This way we find that the power spectral density of random DO events differs fundamentally from a simple red noise random process. These results question the applicability of linear spectral analysis for estimating the statistical significance of highly non-linear processes such as DO events. More precisely, to enhance our scientific understanding about the trigger of DO events, we must not consider simple "straw men" as, for example, the AR1 random process, but rather test against realistic alternative descriptions.
To calibrate delta O-18 time-series from speleothems in the eastern Indian summer monsoon (ISM) region of India, and to understand the moisture regime over the northern Bay of Bengal (BoB) we analyze the delta O-18 and delta D of rainwater, collected in 2007 and 2008 near Cherrapunji, India. delta D values range from + 18.5 parts per thousand to 144.4 parts per thousand, while delta O-18 varies between +0.8 parts per thousand and 18.8 parts per thousand. The Local Meteoric Water Line (LMWL) is found to be indistinguishable from the Global Meteoric Water Line (GMWL). Late ISM (September-October) rainfall exhibits lowest delta O-18 and delta D values, with little relationship to the local precipitation amount. There is a trend to lighter isotope values over the course of the ISM, but it does not correlate with the patterns of temperature and rainfall amount delta O-18 and delta D time-series have to be interpreted with caution in terms of the 'amount effect' in this subtropical region. We find that the temporal trend in delta O-18 reflects increasing transport distance during the ISM, isotopic changes in the northern BoB surface waters during late ISM, and vapor re-equilibration with rain droplets. Using an isotope box model for surface ocean waters, we quantify the potential influence of river runoff on the isotopic composition of the seasonal freshwater plume in the northern BoB. Temporal variations in this source can contribute up to 25% of the observed changes in stable isotopes of precipitation in NE India. To delineate other moisture sources, we use backward trajectory computations and find a strong correlation between source region and isotopic composition. Palaeoclimatic stable isotope time-series from northeast Indian speleothems likely reflect changes in moisture source and transport pathway, as well as the isotopic composition of the BoB surface water, all of which in turn reflect ISM strength. Stalagmite records from the region can therefore be interpreted as integrated measures of the ISM strength.
To balance the steady decrease of conventional hydrocarbon resources, increased utilization of unconventional and new energy resources, such as shale gas and geothermal energy, is required. Also, the geological sequestration of carbon dioxide is being considered as a technology that may temporarily mitigate the effects of CO2 emission. Sites suitable for shale gas production, geothermal exploration, or CO2 sequestration are commonly characterized by electrical resistivities distinctly different from those of the surrounding rocks. Therefore, electromagnetic methods can be viable tools to help identify target sites suitable for exploration, and to monitor reservoirs during energy production or CO2 injection. Among the wide variety of electromagnetic methods available, controlled-source magnetotelluric (CSMT) may be particularly suitable because of (i) its ability to resolve both electrically resistive and conductive structures, (ii) controlled sources offering noise control and thus facilitating surveys in populated regions, and (iii) the potential of penetration throughout the depth range accessible by drilling. Nevertheless, CSMT has not yet been widely employed because of logistical challenges of field operations and the requirement of complex and highly computer-intensive data processing. With these difficulties gradually being mitigated by recent technological developments, CSMT may now be reconsidered as an exploration tool. Here, we investigate by 1D and 3D numerical simulations the feasibility of detecting gas shales and identifying sites eligible for geothermal exploration or CO2 sequestration from CSMT data. We consider surface-to-surface, borehole-to-surface, and cross-hole configurations of the sources and receivers. Results and conclusions on the detectability of the targets of interest are presented for various exploration and monitoring scenarios, which are roughly representative of the geological setting of the North German Basin.