Aharonov-Bohm effect in the non-Abelian quantum Hall fluid

The nu=5/2 fractional quantum Hall effect state has attracted great interest recently, both as an arena to explore the physics of non-Abelian quasiparticle excitations, and as a possible architecture for topological quantum information processing. Here we use the conformal field theoretic description of the Moore-Read state to provide clear tunneling signatures of this state in an Aharonov-Bohm geometry. While not probing statistics directly, the measurements proposed here would provide a first, experimentally tractable step towards a full characterization of the 5/2 state.Comment: 5 pages, 3 figures, 2 tables, added one more figure and conductances formulae for the three channel

Coulomb Blockade in Hierarchical Quantum Hall Droplets

The degeneracy of energy levels in a quantum dot of Hall fluid, leading to conductance peaks, can be readily derived from the partition functions of conformal field theory. Their complete expressions can be found for Hall states with both Abelian and non-Abelian statistics, upon adapting known results for the annulus geometry. We analyze the Abelian states with hierarchical filling fractions, \nu=m/(mp \pm 1), and find a non trivial pattern of conductance peaks. In particular, each one of them occurs with a characteristic multiplicity, that is due to the extended symmetry of the m-folded edge. Experimental tests of the multiplicity can shed more light on the dynamics of this composite edge.Comment: 8 pages; v2: published version; effects of level multiplicities not well understood, see arXiv:0909.3588 for the correct analysi

The catalogue of OB associations in IC 1613

We present a catalogue of OB associations in IC 1613. Using an automatic and objective method (Battinelli's 1991 technique) 60 objects were found. The size distribution reveals a significant peak at about 60 parsecs if a distance modulus of 24.27 mag is assumed. Spatial distributions of the detected associations and H II regions are strongly correlated.Comment: 5 pages, 3 figures, A&A accepte

COMPETITION AND COOPERATION: SINO-RUSSIAN INTERACTIONS IN ASIA IN THE ERA OF GREAT POWER COMPETITION

In the great power competition–era, the United States finds itself challenged by two main adversaries: Russia and China. This is especially evident in Asia, where both rival powers seek to retain and expand their traditional political, economic, and military spheres of influence while attempting to put limits on U.S. involvement. This thesis explored the dynamics of competition and cooperation between Russia and China in order to ascertain which are stronger. To achieve this, the thesis examined Sino-Russian interactions in three specific cases: Central Asia, North Korea, and Mongolia. In the case of Central Asia, competition between Russia and China was the strongest of the three cases due to the region’s importance to both great powers. However, shared security concerns and the opposition to U.S. presence push Moscow and Beijing toward cooperation. Regarding North Korea, Russia largely follows China’s lead, recognizing shared concerns about the stability of the DPRK regime and the greater importance of the region to Beijing. Finally, in Mongolia, Moscow and Beijing cooperate for the sake of maintaining a stable and predictable neighbor, avoiding an unnecessary security dilemma. In all three cases, Russia and China were found to prefer cooperation to competition, both to ensure their peripheries’ stability and focus their efforts on the great power competition with the United States.Lieutenant, United States NavyApproved for public release. Distribution is unlimited

Computational equivalence of the two inequivalent spinor representations of the braid group in the Ising topological quantum computer

We demonstrate that the two inequivalent spinor representations of the braid group \B_{2n+2}, describing the exchanges of 2n+2 non-Abelian Ising anyons in the Pfaffian topological quantum computer, are equivalent from computational point of view, i.e., the sets of topologically protected quantum gates that could be implemented in both cases by braiding exactly coincide. We give the explicit matrices generating almost all braidings in the spinor representations of the 2n+2 Ising anyons, as well as important recurrence relations. Our detailed analysis allows us to understand better the physical difference between the two inequivalent representations and to propose a process that could determine the type of representation for any concrete physical realization of the Pfaffian quantum computer.Comment: 9 pages, 2 figures, published versio

Flotation of Barite From Complex Iron Ore

The present contribution is aimed at the production of a high-grade barite concentrate front complex iron ores of ore-deposit Kremikovtzi,Bulgaria. The ores consisting main-ly of limonite, hematite and siderite have been bene-ficiated by high intensity electromagnetic wet separation on magnetic separator type Jones DP 317. Barite flotation has been succeeded from non-magnetic fraction merged with ground barite rear materials. The collecting flotation agents OMC 199 and AERO 8-15 (2:1 ratio) at the total dosage rate of 400-450 g/t have been applied. The frother OrePrep F 501 consumption has been 10-15 g/t_ Water glass has been applied as a silica depressant at the application rate of 4-4.5 kg/t. Annual output of flotation barite concentrate reach 120 000 tons. Of this quantity 75 wt. i7c are exported in bulk with total assay of BaSO4 and SrSO4 97-98 wt % and 8 wt % moisture. The rest part is dried, ground and bagged. The qualirr corresponds to OCMA (Oil Companies Material Association) /API (American Petroleum Institutes requirements