Binary spinning black hole Hamiltonian in canonical center-of-mass and rest-frame coordinates through higher post-Newtonian order

The recently constructed Hamiltonians for spinless binary black holes through third post-Newtonian order and for spinning ones through formal second post-Newtonian order, where the spins are counted of zero post-Newtonian order, are transformed into fully canonical center-of-mass and rest-frame variables. The mixture terms in the Hamiltonians between center-of-mass and rest-frame variables are in accordance with the relation between the total linear momentum and the center-of-mass velocity as demanded by global Lorentz invariance. The various generating functions for the center-of-mass and rest-frame canonical variables are explicitly given in terms of the single-particle canonical variables. The no-interaction theorem does not apply because the world-line condition of Lorentz covariant position variables is not imposed.Comment: 18 pages, no figure

Design of an SMC Storage Machine with a Symmetrically Placed Driving Element

V diplomové práci je prezentováno konstrukční řešení zakladače SMC (Schäfer Miniload Crane), jehož hnací člen bude umístěn symetricky vůči blokům vodících kladek, tj. v ose kolejnice. Koncepce zakladače SMC se symetricky umístěným hnacím členem by měla zamezit nadměrnému opotřebování vodících kladek a přispět ke stabilnější jízdě po kolejnici.This thesis presents design solution of SMC storage machine (Schäfer Miniload Crane) with symmetrically placed driving element towards blocks of idle pulleys. Solution of SMC storage machine with symmetrically placed driving element could reduce excessive abrasion of idle pulleys and contribute to more stable ride on the rail.

QCD at Finite Density and Color Superconductivity

Brief review of current status of the field.Comment: Invited talk at Lattice 99, Pisa, July 1999. 5 pages, 7 fig

Channeling process in a bent crystal

We have investigated the channeling process of charged particles in a bent crystal. Invoking simple assumptions we derive a criterion, which determines whether channeling occurs or not. We obtain the same criterion using the Dirac equation. It is shown that the centrifugal force acting on the particle in the bent crystal significantly alters the effective transverse potential. The cases of axial and planar channeling are considered. The channeling probability and the dechanneling probability due to tunneling of the particle under the barrier in the effective transverse potential are estimated. These probabilities depend on the specific scaling parameter characterizing the process. Using the quasiclassical theory of synchrotron radiation we have calculated the contribution to the radiation spectrum, which arises due to the curvature of the channel. This contribution becomes significant to TeV electrons or positrons. Some practical consequences of our results are briefly discussed

Two-dimensional simulations of temperature and current-density distribution in electromigrated structures

We report on the application of a feedback-controlled electromigration technique for the formation of nanometer-sized gaps in mesoscopic gold wires and rings. The effect of current density and temperature, linked via Joule heating, on the resulting gap size is investigated. Experimentally, a good thermal coupling to the substrate turned out to be crucial to reach electrode spacings below 10 nm and to avoid overall melting of the nanostructures. This finding is supported by numerical calculations of the current-density and temperature profiles for structure layouts subjected to electromigration. The numerical method can be used for optimizing the layout so as to predetermine the location where electromigation leads to the formation of a gap.Comment: 9 pages, 6 figure

Modernization and construction of identity: Protestantism in Central America (1980 until today

Schäfer H. Modernisierung und Identitätskonstruktion: Zum Protestantismus in Zentralamerika (1980 bis heute). In: Kurtenbach S, Mackenbach W, Maihold G, Wünderich V, eds. Zentralamerika heute. Bibliotheca Ibero-Americana. Vol 115. Frankfurt a.M.: Vervuert; 2008: 485-506