Studies of final states in small x deep inelastic scattering

We investigate the possibility of identifying In(l/x) dynamics from studies of the final state in electron - proton deep inelastic scattering (DIS) in the small x region of the HERA collider at DESY. Motivated by recent observations at HERA we consider again the measurement of DIS events containing an identified forward jet as proposed by Mueller. We find that the shape of the x distribution of the data is described well by a prediction based on In(l/x) dynamics. Since forward jets are difficult to identify and measure accurately in the experiments we suggest the study of deep inelastic events containing an energetic isolated photon. We quantify the enhancement arising from the leading In(l/x) gluon emissions with a view to using such events to identify the underlying dynamics in the small x regime at HERA. To overcome the small event rate of jet + γ we propose that the forward jet may alternatively be identified through a single energetic decay product, the π . We investigate the feasibility of utilizing these deep inelastic + forward π events as an indicator of the small x dynamics. Motivated by this study the HI collaboration recently performed a DIS + π measurement. Therefore we update our BFKL prediction imposing the HI cuts in the calculation. We fix the normalisation by comparing with HERA data for DIS + jet. Finally we study the transverse momentum (pr) spectrum of charged particles produced in DIS at small Bjorken x in the central region between the current jet and the proton remnants. Again we normalize the BFKL prediction by comparing with the H1 DIS + jet data. We calculate the spectrum at large pr with the BFKL ln(l/x) resummation included and then repeat the calculation with it omitted. We find that data favour the former

Large-scale interactive retrieval in art collections using multi-style feature aggregation

Finding objects and motifs across artworks is of great importance for art history as it helps to understand individual works and analyze relations between them. The advent of digitization has produced extensive digital art collections with many research opportunities. However, manual approaches are inadequate to handle this amount of data, and it requires appropriate computer-based methods to analyze them. This article presents a visual search algorithm and user interface to support art historians to find objects and motifs in extensive datasets. Artistic image collections are subject to significant domain shifts induced by large variations in styles, artistic media, and materials. This poses new challenges to most computer vision models which are trained on photographs. To alleviate this problem, we introduce a multi-style feature aggregation that projects images into the same distribution, leading to more accurate and style-invariant search results. Our retrieval system is based on a voting procedure combined with fast nearest-neighbor search and enables finding and localizing motifs within an extensive image collection in seconds. The presented approach significantly improves the state-of-the-art in terms of accuracy and search time on various datasets and applies to large and inhomogeneous collections. In addition to the search algorithm, we introduce a user interface that allows art historians to apply our algorithm in practice. The interface enables users to search for single regions, multiple regions regarding different connection types and holds an interactive feedback system to improve retrieval results further. With our methodological contribution and easy-to-use user interface, this work manifests further progress towards a computer-based analysis of visual art

"Doris ihr'n Mann seine Partei": die Reduktion von Frauen- auf Familienpolitik im bundesdeutschen Wahlkampf 2002

'Die Rhetorik im deutschen Bundestagswahlkampf 2002 wurde entscheidend vom Schlagwort 'Familie' geprägt, während Frauen- und Gleichstellungspolitik eine nur marginale Rolle spielten. Die Studie fragt nach den Ursachen der Engführung von Frauen- auf Familienpolitik im Wahlkampf. Die Analyse programmatischer Aussagen der fünf großen bundesdeutschen Parteien, der Arbeit der Wahlkampfzentralen sowie der Presseberichterstattung im Vorfeld der Wahlen zeigt, dass die Refamiliarisierung der geschlechterpolitischen Debatte im Bundestagswahlkampf 2002 entscheidend von den maskulin geprägten Wahlkampfstäben getragen wurde. Ihr mangelndes geschlechterpolitisches Differenzierungsvermögen sowie die Forderung nach Plakativität und medialer Dramatisierung formten aus frauen- und familienpolitischen Themen ein Amalgam, in dem Frauen vornehmlich als Mütter angerufen wurden und Väter unsichtbar blieben. Gleichstellungspolitisch brisante Themen wurden so nicht nur dethematisiert, sondern auch delegitimiert. Die bundesdeutschen Medien be- und verstärkten durch ihren routinisierten Indexierungshabitus die Dethematisierung von Frauenpolitik.' (Autorenreferat)'The rhetoric of the German federal election campaign was characterized by the term 'family', while women's and equal opportunity politics played only a residual role in the election debate. Our study investigates the causes for this reduction of women's policy to family policy in the election campaign. We analyzed the programmatic statements of the five major parties, the strategies employed by the campaign headquarters and the national press reports in the months heading up to the elections. The main finding is that the refamiliarization of gender debates was primarily due to the masculinist frames within the campaign headquarters. Campaign strategists for the most part exhibited little differentiated knowledge regarding gender issues. Moreover, their need for polarization and dramatization of the campaign formed a mixture of women's and policy issues that addressed women only as mothers - while for example leaving fathers completely out of the discourse frames. During the campaign, equal opportunity issues were not only dethematized but also delegitimized. The German media supported this delegitimation by way of indexing issues according to weight they had acquired in the campaigns.' (author's abstract