19,448 research outputs found
Inventories of Delaware's coastal vegetation and land-use utilizing digital processing of ERTS-1 imagery
There are no author-identified significant results in this report
Utilization of ERTS-1 data to monitor and classify eutrophication of inland lakes
A technique is being developed for use of ERTS in estimating and monitoring trophic levels of inland lakes. Preliminary findings are that Michigan lakes and ponds of one acre or more are resolvable in bands 5, 6 and 7 of NASA MSS imagery under fair conditions (haze and 70% cloud cover). In processed imagery (CCT) smaller features, including water color patterns, are evident within some lakes of 40 acres or more. Image distortion of lake size, shape, orientation, etc. is minimal; discrimination of lakes and ponds from various wetlands is good. Subsequent ERTS and aircraft imagery will be correlated with detailed ground truth of water color and quality in eutrophic test lakes
On the Ehrenfest theorem of quantum mechanics
We give a mathematically rigorous derivation of Ehrenfest's equations for the
evolution of position and momentum expectation values, under general and
natural assumptions which include atomic and molecular Hamiltonians with
Coulomb interactions.Comment: To appear in J. Math. Phy
Computer mapping of turbidity and circulation patterns in Saginaw Bay, Michigan from LANDSAT data
The author has identified the following significant results. LANDSAT was used as a basis for producing geometrically-corrected, color-coded imagery of turbidity and circulation patterns in Saginaw Bay, Michigan (Lake Huron). This imagery shows nine discrete categories of turbidity, as indicated by nine Secchi depths between 0.3 and 3.3 meters. The categorized imagery provided an economical basis for extrapolating water quality parameters from point samples to unsample areas. LANDSAT furnished a synoptic view of water mass boundaries that no amount of ground sampling or monitoring could provide
Distant perturbation asymptotics in window-coupled waveguides. I. The non-threshold case
We consider a pair of adjacent quantum waveguides, in general of different
widths, coupled laterally by a pair of windows in the common boundary, not
necessarily of the same length, at a fixed distance. The Hamiltonian is the
respective Dirichlet Laplacian. We analyze the asymptotic behavior of the
discrete spectrum as the window distance tends to infinity for the generic
case, i.e. for eigenvalues of the corresponding one-window problems separated
from the threshold
Analysis of Mesostructure Unit Cells Comprised of Octet-truss Structures
A unit truss finite element analysis method allowing non-linear deformation is employed to
analyze a unit cell comprised of n
3
octet-truss structures for their stiffness and displacement
compared to their relative density under loading. Axial, bending, shearing, and torsion effects are
included in the analysis for each strut in the octet-truss structure which is then related to the
mesostructure level (unit cell). The versatility of additive manufacturing allows for the
fabrication of these complex unit cell truss structures which can be used as building blocks for
macro-scale geometries. The finite element calculations are compared to experimental results for
samples manufactured on a Stereolithography Apparatus (SLA) out of a standard resin.Mechanical Engineerin
Preliminary catalog of pictures taken on the lunar surface during the Apollo 16 mission
A catalog of all pictures taken from the lunar module or the lunar surface during the Apollo 16 lunar stay is presented. The tabulations are arranged for the following specific uses: (1) given the number of a particular frame, find its location in the sequence of lunar surface activity, the station from which it was taken and the subject matter of the picture; (2) given a particular location or activity within the sequence of lunar surface activity, find the pictures taken at that time and their subject matter; and (3) given a sample number from the voice transcript listed, find the designation assigned to the same sample by the lunar receiving laboratory
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