6,041 research outputs found

    Controllability of nonlinear systems

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    Hermann method for controllability determination of linear and nonlinear control system

    On the optimality of a totally singular vector control- an extension of the green's theorem approach to higher dimensions

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    Extension of Green theorem approach to higher dimensions for determination of optimality of totally singular vector contro

    Contact transformations and the theory of optimal control

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    Contact transformation of independent and dependent variables of Hamilton-Jacobi equatio

    Spin vector control for a spinning space station. Volume 2 - Analytic manual Final report

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    Computer manual for calculating dynamic vector control of dual spin space statio

    Controllability of nonlinear systems with linearly occurring controls

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    Nonlinear system controllability by application of linear control vector

    Density-functional investigation of the rhombohedral to simple cubic phase transition of arsenic

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    We report on our investigation of the crystal structure of arsenic under compression, focusing primarily on the pressure-induced A7 to simple cubic (sc) phase transition. The two-atom rhombohedral unit cell is subjected to pressures ranging from 0 GPa to 200 GPa; for each given pressure, cell lengths and angles, as well as atomic positions, are allowed to vary until the fully relaxed structure is obtained. We find that the nearest and next-nearest neighbor distances give the clearest indication of the occurrence of a structural phase transition. Calculations are performed using the local density approximation (LDA) and the PBE and PW91 generalized gradient approximations (GGA-PBE and GGA-PW91) for the exchange-correlation functional. The A7 to sc transition is found to occur at 21+/-1 GPa in the LDA, at 28+/-1 GPa in the GGA-PBE and at 29+/-1 GPa in the GGA-PW91; no volume discontinuity is observed across the transition in any of the three cases. We use k-point grids as dense as 66X66X66 to enable us to present reliably converged results for the A7 to sc transition of arsenic.Comment: To be published in Physical Review B; material supplementary to this article is available at arXiv:0810.169

    Performance of alkaline battery cells used in emergency locator transmitters

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    The characteristics of battery power supplies for emergency locator transmitters (ELT's) were investigated by testing alkaline zinc/manganese dioxide cells of the type typically used in ELT's. Cells from four manufacturers were tested. The cells were subjected to simulated environmental and load conditions representative of those required for survival and operation. Battery cell characteristics that may contribute to ELT malfunctions and limitations were evaluated. Experimental results from the battery cell study are discussed, and an evaluation of ELT performance while operating under a representative worst-case environmental condition is presented

    Algorithmic aspects of disjunctive domination in graphs

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    For a graph G=(V,E)G=(V,E), a set DVD\subseteq V is called a \emph{disjunctive dominating set} of GG if for every vertex vVDv\in V\setminus D, vv is either adjacent to a vertex of DD or has at least two vertices in DD at distance 22 from it. The cardinality of a minimum disjunctive dominating set of GG is called the \emph{disjunctive domination number} of graph GG, and is denoted by γ2d(G)\gamma_{2}^{d}(G). The \textsc{Minimum Disjunctive Domination Problem} (MDDP) is to find a disjunctive dominating set of cardinality γ2d(G)\gamma_{2}^{d}(G). Given a positive integer kk and a graph GG, the \textsc{Disjunctive Domination Decision Problem} (DDDP) is to decide whether GG has a disjunctive dominating set of cardinality at most kk. In this article, we first propose a linear time algorithm for MDDP in proper interval graphs. Next we tighten the NP-completeness of DDDP by showing that it remains NP-complete even in chordal graphs. We also propose a (ln(Δ2+Δ+2)+1)(\ln(\Delta^{2}+\Delta+2)+1)-approximation algorithm for MDDP in general graphs and prove that MDDP can not be approximated within (1ϵ)ln(V)(1-\epsilon) \ln(|V|) for any ϵ>0\epsilon>0 unless NP \subseteq DTIME(VO(loglogV))(|V|^{O(\log \log |V|)}). Finally, we show that MDDP is APX-complete for bipartite graphs with maximum degree 33

    Lifetime and Coherence of Two-Level Defects in a Josephson Junction

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    We measure the lifetime (T1T_{1}) and coherence (T2T_{2}) of two-level defect states (TLSs) in the insulating barrier of a Josephson phase qubit and compare to the interaction strength between the two systems. We find for the average decay times a power law dependence on the corresponding interaction strengths, whereas for the average coherence times we find an optimum at intermediate coupling strengths. We explain both the lifetime and the coherence results using the standard TLS model, including dipole radiation by phonons and anti-correlated dependence of the energy parameters on environmental fluctuations.Comment: 4 pages, 4 figures and supplementary material (3 pages, 2 figures, 1 table
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