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In present-day land and marine controlled-source electromagnetic (CSEM) surveys, electromagnetic fields are commonly generated using wires that are hundreds of metres long. Nevertheless, simulations of CSEM data often approximate these sources as point dipoles. Although this is justified for sufficiently large source-receiver distances, many real surveys include frequencies and distances at which the dipole approximation is inaccurate. For 1D layered media, electromagnetic (EM) fields for point dipole sources can be computed using well-known quasi-analytical solutions and fields for sources of finite length can be synthesized by superposing point dipole fields. However, the calculation of numerous point dipole fields is computationally expensive, requiring a large number of numerical integral evaluations. We combine a more efficient representation of finite-length sources in terms of components related to the wire and its end points with very general expressions for EM fields in 1D layered media. We thus obtain a formulation that requires fewer numerical integrations than the superposition of dipole fields, permits source and receiver placement at any depth within the layer stack and can also easily be integrated into 3D modelling algorithms. Complex source geometries, such as wires bent due to surface obstructions, can be simulated by segmenting the wire and computing the responses for each segment separately. We first describe our finite-length wire expressions and then present 1D and 3D examples of EM fields due to finite-length sources for typical land and marine survey geometries and discuss differences to point dipole fields.
The study of electromagnetic (EM) field sensitivities is useful for assessing the feasibility of controlled-source electromagnetic (CSEM) surveys. Sensitivity calculations are also a principal building block of EM inversion schemes. Sensitivities are formally given by the derivatives of the EM field components with respect to conductivity. For horizontally layered media, these derivatives can be evaluated analytically, offering advantages in computational efficiency and accuracy over numerical evaluation. We present a complete set of explicit analytic expressions for the EM field sensitivities in 1-D VTI-anisotropic media for horizontal and vertical electric and magnetic dipole sources, and also for finite horizontal electric sources. Since our derivations are based on a formulation for EM fields that is quite general in allowing for sources and receivers at any depth, our sensitivity expressions exhibit the same generality. We verify our expressions by comparison to numerical solutions, and finally present application examples that demonstrate the utility and versatility of these expressions for CSEM feasibility studies.
UN-Reform und Menschenrechte
(2011)
Inhalt: - Einführung - I. Allgemeiner Überblick über die UN-Reform - 1. Die Rolle der Vereinten Nationen in einer globalisierten Welt - 2. Grundgedanke der Reform - 3. Bisherige Reformschritte - 4. Menschenrechte in der Entwicklungszusammenarbeit - 5. Menschenrechte im Bereich „peace-keeping“ - 6. Kooperation der Vereinten Nationen mit der Privatwirtschaft - 7. Millennium Development Goals - 8. Zwischenergebnis - II. Treaty-body Reform - III. Ergebnis
We study pattern-forming instabilities in reaction-advection-diffusion systems. We develop an approach based on Lyapunov-Bloch exponents to figure out the impact of a spatially periodic mixing flow on the stability of a spatially homogeneous state. We deal with the flows periodic in space that may have arbitrary time dependence. We propose a discrete in time model, where reaction, advection, and diffusion act as successive operators, and show that a mixing advection can lead to a pattern-forming instability in a two-component system where only one of the species is advected. Physically, this can be explained as crossing a threshold of Turing instability due to effective increase of one of the diffusion constants.
We study pattern-forming instabilities in reaction-advection-diffusion systems. We develop an approach based on Lyapunov-Bloch exponents to figure out the impact of a spatially periodic mixing flow on the stability of a spatially homogeneous state. We deal with the flows periodic in space that may have arbitrary time dependence. We propose a discrete in time model, where reaction, advection, and diffusion act as successive operators, and show that a mixing advection can lead to a pattern-forming instability in a two-component system where only one of the species is advected. Physically, this can be explained as crossing a threshold of Turing instability due to effective increase of one of the diffusion constants.
Soft, physically crosslinking, block copolymer elastomers were filled with surface-treated nanoparticles, in order to evaluate the possibility for improvement of their properties when used as soft dielectric actuators. The nanoparticles led to improvements in dielectric properties, however they also reinforced the elastomer matrix. Comparing dielectric spectra of composites with untreated and surface-treated particles showed a measurable influence of the surface on the dielectric loss behaviour for high filler amounts, strongly indicating an improved host-guest interaction for the surface-treated particles. Breakdown strength was measured using a test bench and was found to be in good agreement with the results from the actuation measurements. Actuation responses predicted by a model for prestrained actuators agreed well with measurements up to a filler amount of 20%(vol). Strong improvements in actuation behaviour were observed, with an optimum near 15%(vol) nanoparticles, corresponding to a reduction in electrical field of 27% for identical actuation strains. The use of physically crosslinking elastomer ensured the mechanical properties of the matrix elastomer were unchanged by nanoparticles effecting the crosslinking reaction, contrary to similar experiments performed with chemically crosslinking elastomers. This allows for a firm conclusion about the positive effects of surface-treated nanoparticles on actuation behavior.
Soft nanocomposites with enhanced electromechanical response for dielectric elastomer actuators
(2011)
Electromechanical transducers based on elastomer capacitors are presently considered for many soft actuation applications, due to their large reversible deformation in response to electric field induced electrostatic pressure. The high operating voltage of such devices is currently a large drawback, hindering their use in applications such as biomedical devices and biomimetic robots, however, they could be improved with a careful design of their material properties. The main targets for improving their properties are increasing the relative permittivity of the active material, while maintaining high electric breakdown strength and low stiffness, which would lead to enhanced electrostatic storage ability and hence, reduced operating voltage. Improvement of the functional properties is possible through the use of nanocomposites. These exploit the high surface-to-volume ratio of the nanoscale filler, resulting in large effects on macroscale properties. This thesis explores several strategies for nanomaterials design. The resulting nanocomposites are fully characterized with respect to their electrical and mechanical properties, by use of dielectric spectroscopy, tensile mechanical analysis, and electric breakdown tests. First, nanocomposites consisting of high permittivity rutile TiO2 nanoparticles dispersed in thermoplastic block copolymer SEBS (poly-styrene-coethylene-co-butylene-co-styrene) are shown to exhibit permittivity increases of up to 3.7 times, leading to 5.6 times improvement in electrostatic energy density, but with a trade-off in mechanical properties (an 8-fold increase in stiffness). The variation in both electrical and mechanical properties still allows for electromechanical improvement, such that a 27 % reduction of the electric field is found compared to the pure elastomer. Second, it is shown that the use of nanofiller conductive particles (carbon black (CB)) can lead to a strong increase of relative permittivity through percolation, however, with detrimental side effects. These are due to localized enhancement of the electric field within the composite, which leads to sharp reductions in electric field strength. Hence, the increase in permittivity does not make up for the reduction in breakdown strength in relation to stored electrical energy, which may prohibit their practical use. Third, a completely new approach for increasing the relative permittivity and electrostatic energy density of a polymer based on 'molecular composites' is presented, relying on chemically grafting soft π-conjugated macromolecules to a flexible elastomer backbone. Polarization caused by charge displacement along the conjugated backbone is found to induce a large and controlled permittivity enhancement (470 % over the elastomer matrix), while chemical bonding, encapsulates the PANI chains manifesting in hardly any reduction in electric breakdown strength, and hence resulting in a large increase in stored electrostatic energy. This is shown to lead to an improvement in the sensitivity of the measured electromechanical response (83 % reduction of the driving electric field) as well as in the maximum actuation strain (250 %). These results represent a large step forward in the understanding of the strategies which can be employed to obtain high permittivity polymer materials with practical use for electro-elastomer actuation.
Lake Naivasha, Kenya, is one of a number of freshwater lakes in the East African Rift System. Since the beginning of the twentieth century, it has experienced greater anthropogenic influence as a result of increasingly intensive farming of coffee, tea, flowers, and other horticultural crops within its catchment. The water-level history of Lake Naivasha over the past 200 years was derived from a combination of instrumental records and sediment data. In this study, we analysed diatoms in a lake sediment core to infer past lacustrine conductivity and total phosphorus concentrations. We also measured total nitrogen and carbon concentrations in the sediments. Core chronology was established by (210)Pb dating and covered a similar to 186-year history of natural (climatic) and human-induced environmental changes. Three stratigraphic zones in the core were identified using diatom assemblages. There was a change from littoral/epiphytic diatoms such as Gomphonema gracile and Cymbella muelleri, which occurred during a prolonged dry period from ca. 1820 to 1896 AD, through a transition period, to the present planktonic Aulacoseira sp. that favors nutrient-rich waters. This marked change in the diatom assemblage was caused by climate change, and later a strong anthropogenic overprint on the lake system. Increases in sediment accumulation rates since 1928, from 0.01 to 0.08 g cm(-2) year(-1) correlate with an increase in diatom-inferred total phosphorus concentrations since the beginning of the twentieth century. The increase in phosphorus accumulation suggests increasing eutrophication of freshwater Lake Naivasha. This study identified two major periods in the lake's history: (1) the period from 1820 to 1950 AD, during which the lake was affected mainly by natural climate variations, and (2) the period since 1950, during which the effects of anthropogenic activity overprinted those of natural climate variation.
Signals from the past forms and functions of the traditional behavior in Thomas Kling's essay
(2011)
Reed, T. J., Mehr Licht in Deutschland. Eine kleine Geschichte der Aufklärung; München, Beck, 2009
(2011)
Weimarer Klassik
(2011)
Der Aufsatz beschäftigt sich mit dem Genre des Geschichtsdramas und verweist auf das Problem des Dramas wie auf das der Geschichte im Verlaufe der DDR-Entwicklung und danach. Untersucht werden die Abweichung und Aufloesungserscheinungen des aristotelischen Dramas unter den Bedingung einer geschwundenen Geschichtsutopie.
Der Beitrag untersucht bestimmte Raeume, die in Wolfgang Hilbigs Prosawerk wiederholt auftauchen und die mit einer bestimmten affektiven Ladung ausgestattet sind. Es sind dies die Kuechen, die in Hilbigs Werk einer Geschlechtsverwandlung von einem ehemals weiblichen in einen maennlichen Arbeitsraum unterzogen werden. Auch werden idyllische Waldsiedlungen in Hilbigs Geschichten zu Staetten, die vom Judenmord durchzogen werden. Generall kann verallgemeinert werden, dass Hilbigs Raeume Transformationen unterliegen, die Verwandlungen bewirken.
Der Beitrag untersucht Kleists Dramentexte vor allem im Hinblick auf den "Skandal" des Koerpers und versucht dafuer eine Erklaerung zu finden. Diese besteht zunaechst im Herausfall aus dem Paradigma des aesthetischem Koerpers als einem schoenen Koerper. Zum zweiten aber auch darin, das Kleist mit seinen literarischen Mitteln eine drastische Performation des Koerpers fuer das Buehnenstueck vornahm ohne dafuer eine theatralische Praxis zu haben. Der Einsatz des Koerpers als ein Zeichen im Buehnenspiel ist daher strategisch vom Autor Kleist zu einer Aussage performiert worden, die neben den Aussagen des sprachlichen Textes eine weitere koerpersprachliche Textur konstruiert.
Standing waves are studied as solutions of a complex Ginsburg-Landau equation subjected to local and global time-delay feedback terms. The onset of standing waves is studied at the instability of the homogeneous periodic solution with respect to spatially periodic perturbations. The solution of this spatiotemporal wave pattern is given and is compared to the homogeneous periodic solution.
This study presents the first Si isotope data of the principle Si pools in soils determined by a UV femtosecond laser ablation system coupled to a multicollector inductively coupled plasma mass spectrometer (MC-ICP-MS). This method reveals accurate and precise Si isotope data on bulk materials, and at high spatial resolution, on the mineral scale. The following Si pools have been investigated: a) the Si source to soils on all major silicate minerals on thin sections from bedrock fragments in the soil profiles; b) bulk soils (particle size <2 mm) after fusion to glass beads with an iridium-strip heater or pressed into powder pellets: c) separated clay fractions as pressed powder pellets and e) separated phytoliths as pressed powder pellets. Multiple analyses of three rock standards, BHVO-2, AGV-1 and RGM-1 as fused glass beads and as pressed powder pellets, reveal delta(30)Si values within the expected range of igneous rocks. The MPI-DING reference glass KL2-G exhibits the same Si isotope composition after remelting by an iridium-strip heater showing that this technique does not alter the isotope composition of the glass.
We used this approach to investigated two immature Cambisols developed on sandstone and paragneiss in the Black Forest (Germany), respectively. Bulk soils show a largely uniform Si isotope signature for different horizons and locations, which is close to those of primary quartz and feldspar with delta(30)Si values around -0.4 parts per thousand. Soil clay formation is associated with limited Si mobility, which preserves initial Si isotope signatures of parental minerals. An exception is the organic horizon of the paragneiss catchment where intense weathering leads to a high mobility of Si and significant negative isotope signatures as low as to -1.00 parts per thousand in bulk soils. Biogenic opal in the form of phytoliths, exhibits negative Si isotope signatures of about -0.4 parts per thousand. These results demonstrate that UV femtosecond laser ablation MC-ICP-MS provides a tool to characterize the Si isotope signature of the principle Si pools left behind after weathering and Si transport have altered soils. These results can now serve as a fingerprint of the residual solids that can be used to explain the isotope composition of dissolved Si in soil solutions and river water, which is mostly enriched in the heavy isotopes.
Sprachkontakte, Sprachvariation und Sprachwandel : Festschrift für Thomas Stehl zum 60. Geburtstag
(2011)
Vorwort
(2011)
Using 2184 roll call votes (RCV) from 42 electoral terms this paper tests the influence of different factors on party unity in the German Landtage. It finds evidence that the strategic calculus behind RCV-requests is a crucial predictor for unity scores. The requesting party group is on average significantly more united than its parliamentary competitors. It also shows that government status, thin governmental majorities and a growing ideological distance between government and opposition increase unity. Electoral incentives, however, do not seem to influence voting behavior in the German Lander.
Shallow lithological structure across the Dead Sea Transform derived from geophysical experiments
(2011)
In the framework of the DEad SEa Rift Transect (DESERT) project a 150 km magnetotelluric profile consisting of 154 sites was carried out across the Dead Sea Transform. The resistivity model presented shows conductive structures in the western section of the study area terminating abruptly at the Arava Fault. For a more detailed analysis we performed a joint interpretation of the resistivity model with a P wave velocity model from a partially coincident seismic experiment. The technique used is a statistical correlation of resistivity and velocity values in parameter space. Regions of high probability of a coexisting pair of values for the two parameters are mapped back into the spatial domain, illustrating the geographical location of lithological classes. In this study, four regions of enhanced probability have been identified, and are remapped as four lithological classes. This technique confirms the Arava Fault marks the boundary of a highly conductive lithological class down to a depth of similar to 3 km. That the fault acts as an impermeable barrier to fluid flow is unusual for large fault zone, which often exhibit a fault zone characterized by high conductivity and low seismic velocity. At greater depths it is possible to resolve the Precambrian basement into two classes characterized by vastly different resistivity values but similar seismic velocities. The boundary between these classes is approximately coincident with the Al Quweira Fault, with higher resistivities observed east of the fault. This is interpreted as evidence for the original deformation along the DST originally taking place at the Al Quweira Fault, before being shifted to the Arava Fault.
For the investigation of alternating current electrokinetic effects, a system is presented that allows for the simultaneous observation of fluid flow above and around microelectrodes in all three directions in space. Beside the usual microscopical view from top, lateral observation through the same objective is made possible by two small mirrors that are placed next to the electrodes. Fluid flow and movement of fluorescent nanoparticles above interdigitated electrodes are monitored by fluorescence microscopy and digital imaging and are further analysed by image processing. Field frequencies are varied from 10 Hz to 1 GHz at up to 10V(rms). Electrical conductivity of the fluid is monitored in situ in the actual measuring chamber.
A decade into the proclaimed "global war on terror," states are still struggling with the phenomenon's locus and definition under the effective laws. Remarkably, preventive detention of suspected terrorists fluctuates between various legal regimes: In Europe, criminal law is predominantly used but special security orders are occasionally issued as well; Israel applies in part the law of international armed conflicts; and in the United States, detention under a new war premise has been claimed.
This Article analyzes the response of the U.S. Supreme Court, the Israeli Supreme Court, and the European Court of Human Rights to legislative and executive policies asserting the power of preventive detention in the aftermath of September 11, 2001. The comparison exposes significant differences with regard to the application of international law, and most prominently concerning the underlying question of whether the struggle against terrorism should be considered a "war," or, perhaps more traditionally, a fight against crime.
Despite the substantial discrepancies in these three jurisdictions, this Article argues that the similarities are actually more striking. Whereas no court has accepted any attempt to fight terrorism outside the bounds of law, the judges have not hesitated to stretch and blur the pertinent frameworks by extensive interpretation. Ultimately, it is questionable whether on account of the individual's rights the resulting flexibilities and uncertainties are justifiable.
"I don't know what you mean by 'glory'," Alice said. Humpty Dumpty smiled contemptuously. "Of course you don't till I tell you. I meant 'there's a nice knock-down argument for you!" "But 'glory' doesn't mean 'a nice knock-down argument" Alice objected. "When I use a word," Humpty Dumptysaid, in rather a scornful tone, "it means just what I choose it to mean - neither more nor less." "The question is," said Alice, "whether you can make words mean different things." "The question is," said Humpty Dumpty, "which is to be master that's all."
Diese von der Wirtschafts- und Sozialwissenschaftlichen Fakultät der Universität Potsdam angenommene Dissertation thematisiert die Selbstorganisation von Migranten in eigenen Sportvereinen und auf anderen Ebenen des Vereinssports. Sie beruht auf den Ergebnissen eines vom Bundesinstitut für Sportwissenschaft geförderten Forschungsprojekts der Universität Potsdam. Mit mehreren hundert Migrantensportvereinen in ganz Deutschland stellt der Sport einen der wichtigsten Gesellschaftsbereiche für die Selbstorganisation von Zuwanderern dar. Doch obwohl sich Migranten in der Bundesrepublik schon seit den 1960er Jahren in eigenen Sportvereinen zusammenschließen, ist das Thema zuvor noch nicht umfassend untersucht worden. Um diese Forschungslücke zu schließen, stellt die Arbeit Basisinformationen über verschiedene Organisationsformen, typische Entstehungszusammenhänge, spezifische Problemfelder sowie wiederkehrende Konfliktmuster bereit und präsentiert darauf aufbauende Annahmen über die Wirkungen der sportbezogenen Selbstorganisation auf das Verhältnis von Einheimischen und Zuwanderern im Sport, auf die allgemeinen interethnischen Beziehungen und auf den gesamtgesellschaftlichen Integrationsprozess. Daran anknüpfend werden mögliche Konsequenzen aufgezeigt, die die verschiedenen Akteure des Sportsystems aus den dargestellten Forschungsbefunden ziehen können. Die Arbeit basiert auf den Befunden einer in den Jahren 2006 bis 2009 durchgeführten empirischen Untersuchung, in der verschiedene qualitative Methoden eingesetzt wurden, um das Forschungsfeld explorativ, ergebnisoffen und in einer möglichst weiten Perspektive zu beleuchten. In erster Linie bestand diese Feldstudie in einer Interviewreihe, für die 25 Vertreter von Migrantensportvereinen sowie 15 Feldexperten aus verschiedenen Berufsgruppen und Organisationen in Leitfaden-Interviews befragt wurden. Ergänzt wurde die Interviewstudie durch eine Zeitungsanalyse, für die sieben Tages- und Wochenzeitungen nach Artikeln zum Thema durchsucht wurden, sowie gezielte Feldbeobachtungen, etwa beim Besuch von Fußballspielen, bei Versammlungen und Festen sowie in Vereinsheimen. Darüber hinaus wurde eine umfangreiche Internetrecherche durchgeführt, bei der vor allem die Webseiten von über 65 Migrantensportvereinen in Augenschein genommen wurden. In allen Untersuchungsteilen war das Vorgehen des Verfassers stark an der Grounded-Theory-Methode orientiert. Die so gewonnenen Forschungsergebnisse deuten darauf hin, dass eigenständige Migrantensportvereine, die als vorherrschende Form der sportbezogenen Selbstorganisation von Zuwanderern im Mittelpunkt der Arbeit stehen, aus komplexen gesellschaftlichen Inklusions-, Schließungs- sowie Segmentationsprozessen resultieren und interindividuell unterschiedliche Beteiligungsmotive ihrer Mitglieder aufnehmen. Sie stellen typischerweise multifunktionale Hybridorganisationen dar und erbringen für die beteiligten Migranten und deren lokale Gemeinschaften spezifische Integrations-, Repräsentations- und Solidarleistungen, durch die sie sich signifikant von deutschen Sportvereinen und Migrantenorganisationen in anderen Sektoren abheben. Zugleich unterscheiden sich die Migrantensportvereine untereinander hinsichtlich Vereinstätigkeit, Selbstverständnis und Konfliktbeteiligung sehr stark. Ihre Rückwirkung auf den Vereinssport als organisationales Feld, auf die interethnischen Beziehungen in anderen Gesellschaftsbereichen und auf den gesamtgesellschaftlichen Integrationsprozess ist den präsentierten Forschungsergebnissen zufolge gleichfalls sehr ambivalent. Einerseits erbringen Migrantenvereine nicht nur die gleichen gemeinnützigen Leistungen im Bereich der sozialen Integration wie andere Sportvereine auch, sondern entfalten darüber hinaus, indem sie die Integrationsfähigkeit ihrer Mitglieder erhöhen und Personen in den organisierten Sport einbeziehen, die sonst gar keinem Sportverein beitreten würden, spezifische Integrationswirkungen, die andere Sportvereine nicht aufweisen. Andererseits erhöht die Selbstorganisation von Migranten in eigenen Sportvereinen soziale Distanzen und Spannungen zwischen Einheimischen und Zuwanderern, zumal Migrantensportvereine vor allem an den manchmal gewaltvollen Konflikten im Amateurfußball überproportional häufig beteiligt sind. Darüber hinaus stellt ein relativ kleiner Teil der Migrantensportvereine wegen Organisationsdefiziten eine ernste Belastung für die Tätigkeit der Sportverbände dar. Pauschalisierende Negativbewertungen der Vereine werden vom Verfasser jedoch als ungerechtfertigt und nicht sachangemessen zurückgewiesen.
Mehr Chancen als Risiken
(2011)
Anne Christensen spricht von partizipativer Entwicklung, wenn sie sich zum Komplex Bibliothek 2.0 äußert, und meint damit primär die stärkere Einbeziehung der Benutzer, wenn es um die Zukunft der kollaborativen Erschließung von Medien in Bibliothekskatalogen geht.1 Diese Art der Partizipation tangiert Kernaufgaben sowohl an Öffentlichen als auch an wissenschaftlichen Bibliotheken. Über die Beteiligung der Benutzer am Katalog 2.0 hinaus könnte auch durch eine weitere Form der Partizipation Einfl uss auf die Zukunft Öffentlicher Bibliotheken genommen werden: durch den Bürgerhaushalt.
Der Bürger entscheidet mit
(2011)
»Warum erregt der geplante Abriss eines Bahnhofs die Nation, während gegen das hundertfache Sterben von Bibliotheken immer nur ein paar Stimmen laut werden? Wo sind die Wutbürger, wenn man sie braucht?«, überlegte sich hierzulande Tilman Spreckelsen.1 Die Kernfrage lautet also: Stehen die Bürger eigentlich hinter der Bibliothek? Ob und wie die Bürgerschaft für ihre Öffentliche Bibliothek entscheidet, wenn sie entscheiden darf, wird im vorliegenden Aufsatz thematisiert. Ergebnisse von Bürgerbegehren und Bürgerentscheiden stehen dabei im Fokus, da bürgerschaftliches Engagement bei diesen Mitwirkungsinstrumenten besonders gefragt ist und es gleichzeitig kommunalpolitische Folgen haben kann. Am Beispiel von Stuttgart 21 wird darüber hinaus der Fragestellung nachgegangen, wie sich eine Öffentliche Bibliothek zu Sachverhalten positioniert, die (nicht nur) kommunalpolitisch brisant sind.
Intention der Arbeit war es, die bibliothekarische Fachwelt zunächst auf den Begriff und die Bedeutung des Bürgerhaushaltes aufmerksam zu machen und eine Auseinandersetzung mit der Thematik zu fördern. Die Öffentliche Bibliothek kann ein Diskussions- bzw. Beteiligungsgegenstand zwischen Bürgerschaft und Politik sowie Verwaltung sein, wenn es im partizipatorischen Verfahren des Bürgerhaushaltes darum geht, Modernisierungsergebnisse in einer Stadt durch gezielte Finanzierung zu erlangen. Eruiert wurde, ob der Bürgerhaushalt das Potential hat, zur Modernisierung von Dienstleistungen Öffentlicher Bibliotheken beizutragen. Mittels Interviews wurden Informationen gesammelt, aufbereitet und ausgewertet.