NASA Scientific and Technical Aerospace Reports

Backward Heat Conduction Problems by a High Order Lattice-Free Finite Difference Method
CASI
Boundary Integral Method; Finite Difference Theory; Galerkin Method; Integral Equations; Nonlinearity; Trefftz Method;
Numerical Analysis
20040120878 Hawaii Univ., Honolulu, HI, USA
Hawaii Superpave Demonstrative Project: Measurement of Asphalt Mix Design Parameters Using Image Analysis
Brandes, H. G.; Hirata, J. G.; Mar. 2003; 100 pp.; In English
Report No.(s): PB2004-107336; UHM/CEE/04-03; No Copyright; Avail: CASI; A05, Hardcopy
Image analysis represents a powerful tool for measuring morphological properties of asphalt mixes from exposed cross
sections of compacted specimens. The procedure involves acquiring digitized images and processing the content by means of
various numerical algorithms. Key parameters that are of interest to pavement design and that are amenable to measurement
by image analysis include aggregate gradation, asphalt content, air void content, amount of flat/elongated aggregates and
distribution of particle orientations. Determination of these properties by standard laboratory tests is time-consuming, costly,
often environmentally undesirable and subject to testing errors. The objective of this study has been to develop a
comprehensive computer program that can produce these quantities by processing 2-D images of compacted HMA sections.
NTIS
Computer Programs; Image Analysis; Image Processing
20040120966 Lawrence Livermore National Lab., Livermore, CA
Slow-Growing Subdivisions in any Dimension: Towards Removing the Curse of Dimensionality
Pascucci, V.; Jun. 25, 2001; 14 pp.; In English
Report No.(s): DE2004-15007272; UCRL-ID-144257; No Copyright; Avail: Department of Energy Information Bridge
The efficient representation of volumetric meshes is a central problem in scientific visualization. The difference in
performance between most visualization algorithm for rectilinear grids and for unstructured mesh is mostly due to fundamental
difference in efficiency of their representations. In Computer Graphics the gap in performance between 2D rectilinear grids
and unstructured mesh has been overcome with the development of representation schemes based on the concept of
subdivision surfaces. This gap has not been bridged in the volumetric cases which is fundamental interest for Scientific
Visualization. In this paper we introduce a slow-growing volumetric subdivision scheme for meshes of any topology, any
intrinsic dimension and composed of a general type of polyhedral cells.
NTIS
Dimensions; Computer Graphics; Unstructured Grids (Mathematics); Scientific Visualization
20040121129 George Mason Univ., Fairfax, VA, USA
Joint Interdisciplinary Earth Science Information Center
Kafatos, Menas; [2004]; 29 pp.; In English
Contract(s)/Grant(s): NCC5-555; No Copyright; Avail: CASI; A03, Hardcopy
The report spans the three year period beginning in June of 2001 and ending June of 2004. Joint Interdisciplinary Earth
Science Information Center’s (JIESIC) primary purpose has been to carry out research in support of the Global Change Data
Center and other Earth science laboratories at Goddard involved in Earth science, remote sensing and applications data and
information services. The purpose is to extend the usage of NASA Earth Observing System data, microwave data and other
Earth observing data. JIESIC projects fall within the following categories: research and development; STW and WW
prototyping; science data, information products and services; and science algorithm support. JIESIC facilitates extending the
utility of NASA’s Earth System Enterprise (ESE) data, information products and services to better meet the science data and
information needs of a number of science and applications user communities, including domain users such as discipline Earth
scientists, interdisciplinary Earth scientists, Earth science applications users and educators.
Derived from text
Earth Sciences; Information Systems; Remote Sensing; University Program
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