NASA Scientific and Technical Aerospace Reports

designed to be the front-end of a haptic display system for virtual prototyping of assemblies.
DTIC
Polygons; Parameterization; Mathematical Models
70
PHYSICS (GENERAL)
Includes general research topics related to mechanics, kinetics, magnetism, and electrodynamics. For specific areas of physics see
categories 71 through 77. For related instrumentation see 35 Instrumentation and Photography; for geophysics, astrophysics, or solar
physics see 46 Geophysics, 90 Astrophysics, or92 Solar Physics.
20060001732 Tokyo Univ. of Agriculture and Technology, Japan
Automatic Diagnosis of Pneumoconiosis by Texture Analysis of Chest X-Ray Images
Kobatake, idefumi; Oh’ishi, Kunio; Miyamichi, Juichi; IEEE International Conference on Acoustics, Speech, and Signal
Processing (ICASSP ‘87); Volume 1; 1987, pp. 14.16.1 - 14.16.4; In English; See also 20060001583
Contract(s)/Grant(s): MOE-60302087; MOE-60550288; Copyright; Avail.: Other Sources
This paper presents a study on automatic diagnosis of pneumoconiosis by texture analysis of chest X-ray images. A
pre-processing method for normalizing distribution of film density is proposed and its effectiveness is studied experimentally.
Dominant causes of the deviations of texture features for evaluating the profusion of small opacities are excluded by the
pre-processing. New texture features based on the distribution of gradient vectors are also proposed. Experiments to evaluate
the proposed system are demonstrated.
Author
Automatic Control; Diagnosis; Chest
20060001787 Ball Aerospace and Technologies Corp., Albuquerque, NM USA
Investigation of Burst Pressures Prediction of Slit Aluminum Cylinders Subjected to Localized Heating
Sun, C. T.; Tanner, T.; Deitemeyer, A.; Nakaima, D.; Bruno, N.; Doering, D.; Tham, C.; Ulibarri, R.; Chen, J. K.; May 1, 2005;
36 pp.; In English; Original contains color illustrations
Contract(s)/Grant(s): F29601-00-D-0010-0014; Proj-ASCA
Report No.(s): AD-A440210; AFRL-DE-PS-TR-2005-1095; No Copyright; Avail.: Defense Technical Information Center
(DTIC)
Crack Tip Opening Angle (CTOA) measurements of aluminum allow 2014-T6 (Al-2014-T6) at various temperatures and
the construction of the corresponding CTOA curves were performed. The CTOA curve as the crack growth criterion was used
to simulate the burst pressures in Al-2014-T6 thin-walled cylinders with a longitudinal crack of different sized under thermal
and mechanical load. The crack growth is simulated using nodal release method in the ABAQUS finite element environment
to predict the burst pressure of axially cracked cylinders.
DTIC
Aluminum; Aluminum Alloys; Crack Propagation; Crack Tips; Heating; Slits
20060001795 Army Research Lab., Adelphi, MD USA
Feasibility Studies of New High Altitude Electromagnetic Pulse Test Materials
Polun, Max; Nov. 1, 2005; 42 pp.; In English; Original contains color illustrations
Report No.(s): AD-A440250; ARL-TR-3677; No Copyright; Avail.: Defense Technical Information Center (DTIC)
The danger of a high-altitude electromagnetic pulse (HEMP) is one of many threats that an Army facility must be capable
of surviving. A standard method of testing the HEMP survivability of these facilities exists. However. it is not capable of being
used in all situations. This feasibility study used a series of experimental test methods and unique antenna designs to evaluate
more flexible methods. The findings indicate that several of the antennae tested have suitable dynamic range characteristics
and that alternative system designs can be employed where space limitations and other factors preclude use of the standard
method.
DTIC
Electromagnetic Pulses; Feasibility; High Altitude; High Altitude Tests
183