2,065 research outputs found

    Increasing Patient Satisfaction Scores on the Pain Management Section of the Hospital Consumer Assessment of Healthcare, Providers, and Systems Survey.

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    D.N.P. Thesis. University of Hawaiʻi at Mānoa 2018

    Internal convective cooling systems for hypersonic aircraft

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    Parametric studies were conducted to investigate the relative merits of construction materials, coolants, and cooled panel concepts for internal convective cooling systems applied to airframe structures of hydrogen-fueled hypersonic aircraft. These parametric studies were then used as a means of comparing various cooled structural arrangements for a hypersonic transport and a hypersonic research airplane. The cooled airplane studies emphasized weight aspects as related to the choice of materials, structural arrangements, structural temperatures, and matching of the cooling system heat load to the available hydrogen fuel-flow heat sink. Consideration was given to reliability and to fatigue and fracture aspects, as well. Even when auxiliary thermal protection system items such as heat shielding, insulation, and excess hydrogen for cooling are considered the more attractive actively cooled airframe concepts indicated potential payload increases of from 40 percent to over 100 percent for the hypersonic transport as compared to the results of previous studies of the same vehicle configuration with an uncooled airframe

    On the inverse image of pattern classes under bubble sort

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    Let B be the operation of re-ordering a sequence by one pass of bubble sort. We completely answer the question of when the inverse image of a principal pattern class under B is a pattern class.Comment: 11 page

    The cone condition and t-designs

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    AbstractThe existence of a t-(v,k,λ) design implies that certain ‘almost constant’ vectors belong to the convex cone generated by the columns of the incidence matrix of t-subsets versus k-subsets of a v-set. We prove that some vectors are not in, or in a few cases are in, this cone—whether a design exists or not. When certain vectors are shown not to be in this cone, the implication is an inequality on the parameters or a condition on the structure of a t-design. We unify a number of known inequalities for t-designs, and derive some new ones concerning t-wise balanced designs, with this approach

    Pairwise balanced designs covered by bounded flats

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    We prove that for any KK and dd, there exist, for all sufficiently large admissible vv, a pairwise balanced design PBD(v,K)(v,K) of dimension dd for which all dd-point-generated flats are bounded by a constant independent of vv. We also tighten a prior upper bound for K={3,4,5}K = \{3,4,5\}, in which case there are no divisibility restrictions on the number of points. One consequence of this latter result is the construction of latin squares `covered' by small subsquares

    Mutually orthogonal latin squares with large holes

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    Two latin squares are orthogonal if, when they are superimposed, every ordered pair of symbols appears exactly once. This definition extends naturally to `incomplete' latin squares each having a hole on the same rows, columns, and symbols. If an incomplete latin square of order nn has a hole of order mm, then it is an easy observation that n2mn \ge 2m. More generally, if a set of tt incomplete mutually orthogonal latin squares of order nn have a common hole of order mm, then n(t+1)mn \ge (t+1)m. In this article, we prove such sets of incomplete squares exist for all n,m0n,m \gg 0 satisfying n8(t+1)2mn \ge 8(t+1)^2 m
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