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  • 1
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    Seasonality in the coastal ocean of North America, 35°N - 48°N [abstract] (2021)
    In:  http://aquaticcommons.org/id/eprint/14316 | 8 | 2014-01-27 21:48:30 | 14316
    Details
    Publication Date: 2021-07-10
    Description: EXTRACT (SEE PDF FOR FULL ABSTRACT):The seasonal cycles of coastal wind stress, adjusted sea level height (ASL), shelf currents and water temperatures off the west coast of North America (35°N to 48°N) were estimated by fitting annual and semiannual harmonics to data from 1981-1983. Longer records of monthly ASL indicate that these two harmonics adequately represent the long-term monthly average seasonal cycle, and that the current measurement period is long enough to define the seasonal cycles, with relatively small errors in magnitude and phase.
    Keywords: Atmospheric Sciences ; Oceanography ; PACLIM
    Repository Name: AquaDocs
    Type: conference_item
    Format: application/pdf
    Format: application/pdf
    Format: 23-24
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  • 2
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    Climatic factors associated with phytoplankton community succession during and after the 1977 drought for the San Francisco Bay-Delta Estuary [abstract] (2021)
    In:  http://aquaticcommons.org/id/eprint/14318 | 8 | 2014-12-10 23:37:25 | 14318
    Details
    Publication Date: 2021-07-10
    Description: Principal coordinates analysis and multiple regression analysis were used to determine the environmental factors associated with the decline in phytoplankton production during and after the 1977 drought for the San Francisco Bay-Delta Estuary. Physical, chemical and biological data were collected semimonthly or monthly during the spring-summer between 1973 and 1982 from 15 sampling sites located throughout the Bay-Delta. A decline in phytoplanktoncommunity diversity and density during the 1977 drought and subsequent years (1978 through 1981) was described using principal coordinates analysis. The best multiple regression which described the changes in phytoplankton community succession contained the variables water temperature, wind velocity and ortho-phosphateconcentration. Together these variables accounted for 61 percent of the variation in the phytoplankton community among years described by principal coordinates analysis. An increase in water temperature, wind velocity and ortho-phosphate concentration within the Bay-Delta, beginning in June 1976 and continuing through 1981, was demonstrated using weighted moving averages. From the strong association between phytoplankton community succession and climatic variables it was hypothesized that the decline in phytoplankton production during and after the 1977 drought was associated with climatic changes within the northeast Pacific.
    Keywords: Ecology ; Environment ; Limnology ; Oceanography ; PACLIM
    Repository Name: AquaDocs
    Type: conference_item
    Format: application/pdf
    Format: application/pdf
    Format: 25-25
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  • 3
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    Multibeam surveys - Ulithi Atoll and Yap Harbour, Yap State Federated States of Micronesia (2021)
    South Pacific Applied Geoscience Commission | Suva, Fiji
    In:  http://aquaticcommons.org/id/eprint/25859 | 20823 | 2018-10-11 09:32:49 | 25859 | South Pacific Applied Geoscience Commission
    Details
    Publication Date: 2022-09-13
    Description: Seabed mapping was completed using a Reson 8101 multibeam system to delineate the seabed morphology in the vicinity of the wreck USS Mississinewa located in water depths of around 40 m in Ulithi Atoll. A second area was mapped in Ulithi Atoll along the NE eastern margin of the lagoon from Masu to Asor island. Results of this mapping did not delineate any extraordinary feature other than the existing morphology of the seabed. The most interesting feature seen were elliptical-shaped mounds which may imply bi-directional bottom currents of similar magnitudes. The mapping of Yap harbour was also completed. These results have been presented in map form as contours and as soundings. The results of the mapping for Yap and Ulithi are available in GIS format. Digital side-scan imagery for all surveyed lines for both Ulithi and Yap harbour were collected and is presently only archived for processing should this facility become available. Conclusions are: The dataset for Ulithi lagoon provides excellent baseline information for long-term assessment of the impacts of the wrecks on the environment. Detailed maps and visualisation of seabed wrecks provides an opportunity for tourism e.g. a potential dive sites. The completion of the multibeam survey of Yap harbour and approaches provides for excellent baseline data for future infrastructure development. Recommendations are: Updating of the existing topographic map for Yap to account for expanding infrastructure in Colonia harbour should be completed. The use of IKONOS imagery in GIS provides an immediate solution for new and up-to-date maps for development planning.
    Keywords: Oceanography
    Repository Name: AquaDocs
    Type: monograph
    Format: application/pdf
    Format: application/pdf
    Format: 27pp.
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  • 4
    Electronic Resource
    Electronic Resource
    Pure adaptive search in global optimization (1992)
    Springer
    Mathematical programming 53 (1992), S. 323-338 
    Details
    ISSN: 1436-4646
    Keywords: Random search ; Monte Carlo optimization ; global optimization ; complexity
    Source: Springer Online Journal Archives 1860-2000
    Topics: Computer Science , Mathematics
    Notes: Abstract Pure adaptive seach iteratively constructs a sequence of interior points uniformly distributed within the corresponding sequence of nested improving regions of the feasible space. That is, at any iteration, the next point in the sequence is uniformly distributed over the region of feasible space containing all points that are strictly superior in value to the previous points in the sequence. The complexity of this algorithm is measured by the expected number of iterations required to achieve a given accuracy of solution. We show that for global mathematical programs satisfying the Lipschitz condition, its complexity increases at mostlinearly in the dimension of the problem.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01585710
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    Paper (German National Licenses)
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  • 5
    Electronic Resource
    Electronic Resource
    Improving Hit-and-Run for global optimization (1993)
    Springer
    Journal of global optimization 3 (1993), S. 171-192 
    Details
    ISSN: 1573-2916
    Keywords: Random search ; Monte Carlo optimization ; algorithm complexity ; global optimization
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mathematics
    Notes: Abstract Improving Hit-and-Run is a random search algorithm for global optimization that at each iteration generates a candidate point for improvement that is uniformly distributed along a randomly chosen direction within the feasible region. The candidate point is accepted as the next iterate if it offers an improvement over the current iterate. We show that for positive definite quadratic programs, the expected number of function evaluations needed to arbitrarily well approximate the optimal solution is at most O(n5/2) wheren is the dimension of the problem. Improving Hit-and-Run when applied to global optimization problems can therefore be expected to converge polynomially fast as it approaches the global optimum.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01096737
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  • 6
    Electronic Resource
    Electronic Resource
    Simulated annealing for constrained global optimization (1994)
    Springer
    Journal of global optimization 5 (1994), S. 101-126 
    Details
    ISSN: 1573-2916
    Keywords: Continuous simulated annealing ; adaptive cooling ; random search ; global optimization ; Monte Carlo optimization
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mathematics
    Notes: Abstract Hide-and-Seek is a powerful yet simple and easily implemented continuous simulated annealing algorithm for finding the maximum of a continuous function over an arbitrary closed, bounded and full-dimensional body. The function may be nondifferentiable and the feasible region may be nonconvex or even disconnected. The algorithm begins with any feasible interior point. In each iteration it generates a candidate successor point by generating a uniformly distributed point along a direction chosen at random from the current iteration point. In contrast to the discrete case, a single step of this algorithm may generateany point in the feasible region as a candidate point. The candidate point is then accepted as the next iteration point according to the Metropolis criterion parametrized by anadaptive cooling schedule. Again in contrast to discrete simulated annealing, the sequence of iteration points converges in probability to a global optimum regardless of how rapidly the temperatures converge to zero. Empirical comparisons with other algorithms suggest competitive performance by Hide-and-Seek.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01100688
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