Scientific and Technical Aerospace Reports Volume 38 July 28, 2000

The driving point mobility matrix of a machinery seating structure determines how much structural acoustic power is transmitted
by the force vector that is applied at each machine mount. In the current research programme analytical estimation procedures
have been developed for the mobility components that have a more extended validity than those based upon the ”thin beam”
or ”thin plate” assumption. These expressions are summarized, discussed and compared with the results of numerical integration
of the equations of the two- or three-dimensional theory of elasticity. They are validated against experimental results. A good
agreement has been found between predictions and the results of the validation experiments. ne estimation procedures have shown
to be sufficiently accurate for preliminary design studies. The results of numerical integration show an excellent agreement with
the experimental results, so this approach can be chosen confidently when more precise results are required, on the basis of a further
developed design.
Author
Elastic Properties; Measure and Integration; Numerical Integration; Supports
98
42
GEOSCIENCES (GENERAL)
�������� ������� �������� ������ ������� �� ��� ����� ��������� ��� ��� �������� ����� �� ���������� ����������� ��� ������� ��������
��� ����� �������� ������ �� ����������� ��� ���������� �� ������� ���
20000062456 Forest Service, Pacific Northwest Research Station, Portland, OR USA
Guide to Ozone Injury in Vascular Plants of the Pacific Northwest
Bruce, S.; Peterson, D. L.; Bowers, D.; Sep. 1999; 76p; In English; Original contains color illustrations
Report No.(s): PB2000-105972; FSGTR-PNW-446; No Copyright; Avail: CASI; A05, Hardcopy; A01, Microfiche
This guide reports visual and descriptive documentation of ozone injury symptoms for common tree, shrub, and herbaceous
species in the region. Symptoms observed in leaves of these species include chlorotic mottle, pigmented stipple, necrosis, and
premature senescence, with considerable variation among and within species. Resource managers and scientists can use the photodocumentation
in this guide to identify potential injury to plants in the field, and to distinguish ozone injury from other pathological
conditions.
NTIS
Ozone; Pathology; Signs and Symptoms; Plants (Botany); Damage
20000062471 NASA Goddard Space Flight Center, Greenbelt, MD USA
Separation of Atmospheric and Surface Spectral Features in Mars Global Surveyor Thermal Emission Spectrometer
(TES) Spectra
Smith, Michael D., NASA Goddard Space Flight Center, USA; Bandfield, Joshua L., Arizona State Univ., USA; Christensen,
Philip R., Arizona State Univ., USA; [2000]; 32p; In English; No Copyright; Avail: CASI; A03, Hardcopy; A01, Microfiche
We present two algorithms for the separation of spectral features caused by atmospheric and surface components in Thermal
Emission Spectrometer (TES) data. One algorithm uses radiative transfer and successive least squares fitting to find spectral
shapes first for atmospheric dust, then for water-ice aerosols, and then, finally, for surface emissivity. A second independent algorithm
uses a combination of factor analysis, target transformation, and deconvolution to simultaneously find dust, water ice, and
surface emissivity spectral shapes. Both algorithms have been applied to TES spectra, and both find very similar atmospheric and
surface spectral shapes. For TES spectra taken during aerobraking and science phasing periods in nadir-geometry these two algorithms
give meaningful and usable surface emissivity spectra that can be used for mineralogical identification.
Author
Algorithms; Mars Global Surveyor; Spectra; Spectrometers; Thermal Emission; Surface Properties; Mars Atmosphere
20000064116 Minnesota Univ., Minneapolis, MN USA
Analytic Element Modeling of Coastal Aquifers Final Report, Sep. 1994 - Sep. 1997
Bakker, M.; Kraemer, S. R.; deLange, W. J.; Strack, O. D. L.; Jan. 2000; 94p; In English
Report No.(s): PB2000-101970; EPA/600/R-99/110; No Copyright; Avail: National Technical Information Service (NTIS)
Four topics were studied concerning the modeling of groundwater flow in coastal aquifers with analytic elements: (1) practical
experience was obtained by constructing a groundwater model of the shallow aquifers below the Delmarva Peninsula USA
using the commercial program MVAEM; (2) a significant increase in performance was obtained by implementing the theory for
variable density flow in a computer program that ran on a supercomputer using vectorization; (3) a new representation for the
density variation was developed that can simulate the change from brackish to fresh water more accurately; and (4) it was shown