Öffentlicher Raum und Verkehr: eine sozialtheoretische Annäherung

"Seit einiger Zeit ist in der Stadtsoziologie von einer 'Fragmentierung' oder 'Verinselung' des öffentlichen Raumes die Rede. Zuweilen wird sogar von einer tiefgreifenden Krise gesprochen, die sich auch in der Benutzung des öffentlichen Nahverkehrs niederschlägt. In vorliegendem discussion paper wird der Wandel hin zu einer heterogenen, pluralistischen Gesellschaft und seine Folgen für die Mobilität im öffentlichen Raum erörtert. Zum einen werden sozialtheoretische Annahmen zur Öffentlichkeit und ihrem Wandel skizziert, zum anderen wird eine teilnehmende Beobachtung zum Verhalten im öffentlichen Nahverkehr gemacht. Besonders auf der Interaktionsebene lässt sich das Phänomen von Öffentlichkeit anschaulich beschreiben. Im Schlussteil wird der Versuch unternommen, mit den aus der Untersuchung und der Sozialtheorie gewonnenen Erkenntnissen Impulse für eine zeitgenössische Innenraumgestaltung im öffentlichen Nahverkehr zu geben." (Autorenreferat)"In the field of urban sociology, the fragmentation process in the public sphere has been a topic of debate for quite some time. There is even talk of a dramatic crisis which also influences the use of urban public transport. This article explains the changes and developments presently taking place towards a heterogeneous, pluralistic society and its effects on mobility in the public space. Social theoretical assumptions regarding the public sphere and its changes are illustrated and a participatory observation of behaviour in urban public transport is presented. The phenomenon of the public sphere can best be described on an interactive level. In the conclusion, suggestions on how to induce a more contemporary interior design in public transport vehicles are presented." (author's abstract

Öffentlicher Raum und Verkehr: Eine sozialtheoretische Annäherung

Seit einiger Zeit ist in der Stadtsoziologie von einer Fragmentierung oder Verinselung des öffentlichen Raumes die Rede. Zuweilen wird sogar von einer tiefgreifenden Krise gesprochen, die sich auch in der Benutzung des öffentlichen Nahverkehrs niederschlägt. In vorliegendem discussion paper wird der Wandel hin zu einer heterogenen, pluralisti-schen Gesellschaft und seine Folgen für die Mobilität im öffentlichen Raum erörtert. Zum einen werden sozialtheoretische Annahmen zur Öffentlichkeit und ihrem Wandel skizziert, zum anderen wird eine teilnehmende Beobachtung zum Verhalten im öffentlichen Nahverkehr gemacht. Besonders auf der Interaktionsebene lässt sich das Phänomen von Öffentlichkeit anschaulich beschreiben. Im Schlussteil wird der Versuch unternommen, mit den aus der Untersuchung und der Sozialtheorie gewonnenen Erkenntnissen Impulse für eine zeitgenössische Innenraum-gestaltung im öffentlichen Nahverkehr zu geben. -- In the field of urban sociology, the fragmentation process in the public sphere has been a topic of debate for quite some time. There is even talk of a dramatic crisis which also influences the use of urban public transport. This article explains the changes and deve-lopments presently taking place towards a heterogeneous, pluralistic society and its effects on mobility in the public space. Social theoretical assumptions regarding the public sphere and its changes are illustrated and a participatory observation of behaviour in urban public transport is presented. The phenomenon of the public sphere can best be described on an interactive level. In the conclusion, suggestions on how to induce a more contemporary interior design in public transport vehicles are presented.

Probleme der wirtschaftlichen Entwicklung Albaniens

Die Südosteuropa-Studien werden von der in München ansässigen Südosteuropa-Gesellschaft, der wichtigsten Wissenschaftsorganisation der Südosteuropa-Forschung im deutschsprachigen Raum, herausgegeben. Sie dienen der vertieften und interdisziplinären wissenschaftlichen Darstellung wichtiger Themen aus der Südosteuropa-Forschung. Auch Fragen zur aktuellen politischen und sozio-ökonomischen Entwicklung in der Region Südosteuropa werden aufgegriffen. Herausgeber der Einzelbände sind renommierte Repräsentanten der deutschen und internationalen Südosteuropa-Forschung.</P

The Outer Tracker Detector of the HERA-B Experiment Part I: Detector

The HERA-B Outer Tracker is a large system of planar drift chambers with about 113000 read-out channels. Its inner part has been designed to be exposed to a particle flux of up to 2.10^5 cm^-2 s^-1, thus coping with conditions similar to those expected for future hadron collider experiments. 13 superlayers, each consisting of two individual chambers, have been assembled and installed in the experiment. The stereo layers inside each chamber are composed of honeycomb drift tube modules with 5 and 10 mm diameter cells. Chamber aging is prevented by coating the cathode foils with thin layers of copper and gold, together with a proper drift gas choice. Longitudinal wire segmentation is used to limit the occupancy in the most irradiated detector regions to about 20 %. The production of 978 modules was distributed among six different laboratories and took 15 months. For all materials in the fiducial region of the detector good compromises of stability versus thickness were found. A closed-loop gas system supplies the Ar/CF4/CO2 gas mixture to all chambers. The successful operation of the HERA-B Outer Tracker shows that a large tracker can be efficiently built and safely operated under huge radiation load at a hadron collider.Comment: 28 pages, 14 figure

The Outer Tracker Detector of the HERA-B Experiment. Part II: Front-End Electronics

The HERA-B Outer Tracker is a large detector with 112674 drift chamber channels. It is exposed to a particle flux of up to 2x10^5/cm^2/s thus coping with conditions similar to those expected for the LHC experiments. The front-end readout system, based on the ASD-8 chip and a customized TDC chip, is designed to fulfil the requirements on low noise, high sensitivity, rate tolerance, and high integration density. The TDC system is based on an ASIC which digitizes the time in bins of about 0.5 ns within a total of 256 bins. The chip also comprises a pipeline to store data from 128 events which is required for a deadtime-free trigger and data acquisition system. We report on the development, installation, and commissioning of the front-end electronics, including the grounding and noise suppression schemes, and discuss its performance in the HERA-B experiment

Open and Hidden Charm Production in 920 GeV Proton-Nucleus Collisions

The HERA-B collaboration has studied the production of charmonium and open charm states in collisions of 920 GeV protons with wire targets of different materials. The acceptance of the HERA-B spectrometer covers negative values of xF up to xF=-0.3 and a broad range in transverse momentum from 0.0 to 4.8 GeV/c. The studies presented in this paper include J/psi differential distributions and the suppression of J/psi production in nuclear media. Furthermore, production cross sections and cross section ratios for open charm mesons are discussed.Comment: 5 pages, 9 figures, to be published in the proceedings of the 6th International Conference on Hyperons, Charm & Beauty Hadrons (BEACH04), Chicago, IL, June 27 - July 3, 200

Search for the Flavor-Changing Neutral Current Decay D0→μ+μ−D^0 \to \mu^+\mu^- with the HERA-B Detector

We report on a search for the flavor-changing neutral current decay $D^0 \to \mu^+\mu^-$ using $50 \times 10^6$ events recorded with a dimuon trigger in interactions of 920 GeV protons with nuclei by the HERA-B experiment. We find no evidence for such decays and set a 90% confidence level upper limit on the branching fraction $Br(D^0 \to \mu^+\mu^-) <2.0 \times 10^{-6}$.Comment: 17 pages, 4 figures (of which 1 double), paper to be submitted to Physics Letters

Measurement of the J/Psi Production Cross Section in 920 GeV/c Fixed-Target Proton-Nucleus Interactions

The mid-rapidity (dsigma_(pN)/dy at y=0) and total sigma_(pN) production cross sections of J/Psi mesons are measured in proton-nucleus interactions. Data collected by the HERA-B experiment in interactions of 920 GeV/c protons with carbon, titanium and tungsten targets are used for this analysis. The J/Psi mesons are reconstructed by their decay into lepton pairs. The total production cross section obtained is sigma_(pN)(J/Psi) = 663 +- 74 +- 46 nb/nucleon. In addition, our result is compared with previous measurements

Inclusive V0V^0 Production Cross Sections from 920 GeV Fixed Target Proton-Nucleus Collisions

Inclusive differential cross sections $d\sigma_{pA}/dx_F$ and $d\sigma_{pA}/dp_t^2$ for the production of \kzeros, \lambdazero, and \antilambda particles are measured at HERA in proton-induced reactions on C, Al, Ti, and W targets. The incident beam energy is 920 GeV, corresponding to $\sqrt {s} = 41.6$ GeV in the proton-nucleon system. The ratios of differential cross sections \rklpa and \rllpa are measured to be $6.2\pm 0.5$ and $0.66\pm 0.07$, respectively, for \xf $\approx-0.06$. No significant dependence upon the target material is observed. Within errors, the slopes of the transverse momentum distributions $d\sigma_{pA}/dp_t^2$ also show no significant dependence upon the target material. The dependence of the extrapolated total cross sections $\sigma_{pA}$ on the atomic mass $A$ of the target material is discussed, and the deduced cross sections per nucleon $\sigma_{pN}$ are compared with results obtained at other energies.Comment: 17 pages, 7 figures, 5 table