Search

In this paper the design of a levee drainage system is formulated as a multiobjective optimization problem in a probabilistic framework. The statistical nature of the problem is reflected by the probabilistic behavior of rainfall and river stage events in any given month. The multiobjective approach allows for the incorporation of noncommensurable objectives such as aesthetics, economics, and social issues into the optimization problem, providing a more realistic quantification of the impact of a flood or high water situation in an interior basin. A new method referred to as the multiobjective statistical method, which integrates statistical attributes with multiobjective optimization methodologies such as the surrogate worth trade-off method, is developed in this paper. A case study using data from the Moline area in Illinois suggests the use of the procedure.

A facility has been constructed to extend the measurements of pion-nucleus scattering with the EPICS system at LAMPF into the angular range of 115 to 180°. The design of the system is described, and results of tests on it are given. Comparisons of measurements of elastic scattering cross sections with previous data are presented.

Excitation functions at 175/sup 0/ (lab) for elastic scattering of ..pi../sup +/ from /sup 12/C and /sup 16/O have been measured across the energy region of the pion-nucleon (3,3) resonance. Optical-model calculations with matter distributions deduced from electron scattering qualitatively reproduce the data, but better agreement can be obtained with suitable modifications. These modifications may indicate the effects of the nuclear medium on the basic pion-nucleon interaction.

A longitudinal study of 32 individuals representing male and female open and deep bite was examined to determine the relationship between subjects who are characterized by proportionately large and small lower anterior face heights and adolescent facial growth spurts. Open bite individuals matured earlier than deep bite individuals. Morphologic differences between the groups were maintained during the adolescent growth spurt. Further studies are needed to examine the relationships between adolescent growth spurt to stature and somatotype.

The polarization of the outgoing protons has been measured for small angle inelastic scattering from 90Zr and 51V with a 319 MeV incident polarized proton beam. The measured spin‐flip cross section is a direct measure of the spin excitations in the nucleus. The results for 90Zr show a large spin‐flip cross section is a direct measure of spin excitations in the nucleus. The results for 90Zr show a large spin‐flip cross section which is approximately evenly distributed between 8 and 25 MeV excitation; the Ml region is not prominent. Preliminary data for 51V also reveal large continuum spin excitations, as well as a clear peak in the Ml region. The data are discussed in relation to the search for missing spin excitation strength in the delta region and to electron scattering results.

Spin‐flip probabilities, Snn, larger than the free nucleon‐nucleon values were observed in the 4He(p↘,p↘’)4He* reaction at Tp=500 MeV and q=375 MeV/c. The results differ from previous measurements on other nuclei.