957 resultados para Link, Isteresi, sismica, controventamento


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"September 6, 1989."

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Yellow, black ink on linen; location, type, amounts of plantings; notes; footpaths, pool, gardens; signed; 77 x 86 cm.; Scale: 1" = 10' [from photographic copy by Lance Burgharrdt]

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Yellow, black ink on linen; plan, four cross-sections; unsigned; 102 x 83 cm.; Scales vary [from photographic copy by Lance Burgharrdt]

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Yellow, black ink on linen; location, type, amounts of plantings; footpaths, pool; unsigned; 40 x 43 cm.; Scale: 1" = 4' [from photographic copy by Lance Burgharrdt]

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Blueprint; topo. lines, elevations; Arthur Lieske, landscape architect, Indianapolis cited as responsible for survey; residence, plantings outlined in pencil; unsigned; 44 x 43 cm.; Scale: 1" = 20' [from photographic copy by Lance Burgharrdt]

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Red, black pencil on tracing paper;location of trees, buildings, gardens, footpaths; contour lines; arrows indicate direction and location of photographs; "drawn by C.C. Godfrey, Jr."; unsigned; 84 x 54 cm.; No scale [from photographic copy by Lance Burgharrdt]

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"HUD-1071-CPD"--P. [4] of cover.

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Mode of access: Internet.

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A method is proposed for determining the optimal placement and controller design for multiple distributed actuators to reduce the vibrations of flexible structures. In particular, application of piezoceramic patches to a horizontally-slewing single-link flexible manipulator modeled using the assumed modes method is investigated. The optimization method uses simulated annealing and allows placement of any number of distributed actuators of unequal length, although piezoceramics of fixed equal lengths are used in the example. It also designs an linear-quadratic-regulator controller as part of the optimization procedure. The measures of performance used in the investigation to determine optimality are the total mass of the system and the time integral of the absolute value of the hub and tip position error. This study also varies the relative weightings for each of these performance measures to observe the effects on the controller designs and piezoceramic patch positions in the optimized solutions.

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The Jiaodong gold province is the largest gold repository in China. Both mineralization and granitoid hosts are spatially related to the crustal-scale Tan-Lu strike-slip fault system, which developed along the Mesozoic continental margin in eastern China. A series of Ar-40/Ar-39 laser incremental heating analyses of hydrothermal sericite/muscovite from three major gold deposits (Jiaojia, Xincheng, and Wangershan) and igneous biotite from the granodiorite hosts were performed to establish a possible temporal link between gold mineralization, magmatism, and movement along the Tan-Lu fault zone. Magmatic biotite crystals yield well-defined and concordant plateau ages between 124.5+/-0.4 Ma and 124.0+/-0.4 Ma (2sigma), whereas sericite and muscovite samples (a total of 30 single separates) give reproducible plateau ages ranging from 121.0+/-0.4 Ma to 119.2+/-0.2 Ma (2sigma). An integration of our Ar-40/Ar-39 results with age data from other major gold deposits in Jiaodong demonstrates that widespread gold mineralization occurred contemporaneously during a 2-3-m.yr. period. Most gold deposits show intimate spatial associations with abundant mafic to intermediate dikes. The mafic dikes have K-Ar ages of 123.5-119.6 Ma, in excellent agreement with those of the gold deposits. These newly obtained Ar-40/Ar-39 ages, in combination with other independent geological and geochronological data on granodioritic intrusions (130-126 Ma), volcanic rocks (1243.6-114.7 Ma), and deformed rocks within strike-slip faults (132-120 Ma) in Jiaodong or adjacent areas, also support the idea that gold mineralization postdated the granodioritic magmatism but was contemporaneous with mafic magmatism and volcanism, all controlled by the transtensional motion along the Tan-Lu fault in the Early Cretaceous.