Single Star-forming galaxies and Star-forming galaxies in SF+SF and mixed pairs

We compare the SFR of single star-forming galaxies with the SFR of star-forming galaxies in pairs. Volume-limited samples are compared selected from the 2dFGRS, applying a maximum magnitude difference criterion. We show that SF galaxies in SF + SF pairs typically increase their SFR as they get fainter, whereas this does not happen for SF galaxies in mixed (SF + passive) pairs. And we provide evidence that differences between single SF and SF in pairs get more significant when SF galaxies in mixed pairs are excluded from the pair sample. Our analysis confirms that enhanced SFR and the presence of a companion galaxy (on 0.5 h^-1 Mpc scale) are correlated quantities, provided the galaxy is neither too luminous nor too faint, and the triggering galaxy is itself a SF galaxy.Comment: 6 pages, 3 figures, contributed paper, to be published in ''The Evolution of Starbursts'' (Bad Honnef 2004), ed. S. Huettemeister & E. Manthley (Melville:AIP

The Continuous Orbifold of N=2 Minimal Model Holography

For the N=2 Kazama-Suzuki models that appear in the duality with a higher spin theory on AdS_3 it is shown that the large level limit can be interpreted as a continuous orbifold of 2N free bosons and fermions by the group U(N). In particular, we show that the subset of coset representations that correspond to the perturbative higher spin degrees of freedom are precisely described by the untwisted sector of this U(N) orbifold. We furthermore identify the twisted sector ground states of the orbifold with specific coset representations, and give various pieces of evidence in favour of this identification.Comment: 24 pages, v2: minor correction

The Exchange Rate and Two Price Inflations in Poland in the Period 1999-2009. Do Globalization and Balassa-Samuelson Effect Matter?

The abrupt depreciation of the zloty during the subprime crisis and fast-rising prices are serious problems, because Poland, having to fulfil five Maastricht criteria, makes the dependence of her domestic inflation on price increases in the EU countries the central point of the discussion about the optimal monetary and fiscal policy rules for the next few years. The primary objective of the paper is to test out some hypotheses about the main sources of the volatility of the Polish zloty / euro exchange rate and inflation in Poland. Because several competing theoretical models describing inflationary processes are widely used, special attention is paid to their empirical verification. The working-hypotheses allowing for the country-specific features of the consumer and producer price inflation are formulated and verified in the paper.cointegration, exchange rate, Balassa-Samuelson effect, price-wage loop

Grußwort des Leiters des Amtes für industrielle Formgestaltung beim Ministerrat der DDR, Staatssekretät Professor Martin Kelm, an das 4. Internationale Bauhauskolloquium

Wissenschaftliches Kolloquium vom 24. bis 26. Juni 1986 in Weimar an der Hochschule für Architektur und Bauwesen zum Thema: 'Der wissenschaftlich-technische Fortschritt und die sozial-kulturellen Funktionen von Architektur und industrieller Formgestaltung in unserer Epoche

Even spin minimal model holography

The even spin W^e_\infty algebra that is generated by the stress energy tensor together with one Virasoro primary field for every even spin s \geq 4 is analysed systematically by studying the constraints coming from the Jacobi identities. It is found that the algebra is characterised, in addition to the central charge, by one free parameter that can be identified with the self-coupling constant of the spin 4 field. We show that W^e_\infty can be thought of as the quantisation of the asymptotic symmetry algebra of the even higher spin theory on AdS_3. On the other hand, W^e_\infty is also quantum equivalent to the so(N) coset algebras, and thus our result establishes an important aspect of the even spin minimal model holography conjecture. The quantum equivalence holds actually at finite central charge, and hence opens the way towards understanding the duality beyond the leading 't Hooft limit.Comment: 32 pages, v2: reference added, minor changes in tex

The symmetric orbifold of N=2 minimal models

The large level limit of the N=2 minimal models that appear in the duality with the N=2 supersymmetric higher spin theory on AdS_3 is shown to be a natural subsector of a certain symmetric orbifold theory. We study the relevant decompositions in both the untwisted and the twisted sector, and analyse the structure of the higher spin representations in the twisted sector in some detail. These results should help to identify the string background of which the higher spin theory is expected to describe the leading Regge trajectory in the tensionless limit.Comment: 32 page

Riding into Place: Contact Zones, Rodeo, and Hybridity in the Canadian West 1900–1970

Each year, people gathered in small towns across the Canadian west to participate in rodeos and stampedes. While these events were often organized to promote and celebrate the non-Native community, organizers were keen to invite Aboriginal people. And Aboriginal people flocked to them. This paper explores the ways in which rodeos and stampedes functioned as points of contact between First Nations, mixed-heritage, and non-Native people. It explores why non-Native communities invited First Nations and why Aboriginal people accepted. It examines the place of on-reserve rodeos in the development of rodeo in western Canada and the extent to which they attracted non-Native people. It then examines how interactions at rodeos were structured by gender and racialization, and how these structures were sometimes overcome. Finally, it offers a glimpse at the emergent community of professional rodeo which, reputedly, embraced all rodeo cowboys regardless of ethnicity. In so doing, this paper explores how hybridity and liminality played a role in the development of Western Canadian rodeo and hence in the community celebrations in towns and cities in British Columbia and Alberta.Chaque année, la population se rassemble dans de petites villes de l’ensemble de l’Ouest canadien pour participer à des rodéos et à des stampedes. Même si, par le passé, de tels événements ont souvent été organisés en vue de promouvoir et de célébrer la collectivité non autochtone, les organisateurs tenaient à inviter les Autochtones. Et les Autochtones s’y rendaient en grand nombre. Cet article explore les façons dont les rodéos et les stampedes ont servi de points de contact entre les peuples des Premières nations, les Métis et les non autochtones. Il explore la raison pour laquelle les collectivités non autochtones invitaient les Premières nations et pourquoi les Autochtones acceptaient. Il examine la place des rodéos sur les réserves dans l’histoire du développement du rodéo dans l’Ouest canadien et montre à quel point ceux-ci attiraient les non autochtones. Il examine ensuite comment les interactions lors des rodéos étaient structurées par genre et par race, et comment de telles structures ont parfois pu disparaître. Finalement, il offre un aperçu de l’émergence du rodéo professionnel qui a rassemblé, probablement, tous les cow-boys de rodéo peu importe leur origine. Par la même occasion, cet article explore comment l’hybridité et la liminalité ont joué un rôle dans le développement du rodéo dans l’Ouest canadien et, par conséquent, dans les célébrations communautaires des villes et municipalités de la Colombie-Britannique et de l’Alberta

Dynamics of a flexible rotor in magnetic bearings

Discussed is a magnetic bearing which was designed and tested in a flexible rotor both as support bearings and as a vibration controller. The design of the bearing is described and the effect of control circuit bandwidth determined. Both stiffness and damping coefficients were measured and calculated for the bearing with good agreement. The bearings were then placed in a single mass rotor as support bearings and the machine run through two critical speeds. Measurements were made of the vibration response in plain bushings and magnetic bearings. Comparisons were also made of the theoretical calculations with the measured peak unbalance response speeds. Finally, runs were made with the magnetic bearing used as a vibration controller

Aerodynamic performance of flared fan nozzles used as inlets

Tests were conducted in a low speed wind tunnel to determine the aerodynamic performance of several flared fan nozzles. Each of the flared nozzles was a downstream-facing inlet to a model fan that was used to simulate a variable pitch fan during reverse thrust operation. The total pressure recovery of each of the flared nozzles as well as that of an unflared nozzle and a serrated flare nozzle was obtained for comparison. The aerodynamic performance of a selected flared nozzle was considered in further detail. The nozzle surface pressures for a flared nozzle were also determined. Results indicated that the differences in aerodynamic performance among the nozzles were most apparent at the wind-tunnel-off condition. A nonzero free stream velocity significantly reduced the perforamnce of all the nozzles, and crosswind flow (free stream flow perpendicular to the model axis) further reduced the performance of the nozzles. The unflared nozzle and the serrated flare nozzle had reduced aerodynamic performance compared to a solid surface flared nozzle