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The erythrocyte's spectrin-actin membrane skeleton is directly shown to be capable of sustaining large, anisotropic strains. Photobleaching of an approximately 1-micrometer stripe in rhodamine phalloidin-labeled actin appears stable up to at least 37 degrees C, and is used to demonstrate large in-surface stretching during elastic deformation of the(More)
We explore the interplay of membrane curvature and non-specific binding due to excluded-volume effects among col-loidal particles inside lipid bilayer vesicles. We trapped sub-micron spheres of two different sizes inside a pear-shaped, multilamellar vesicle and found the larger spheres to be pinned to the vesicle's surface and pushed in the direction of(More)
This paper describes BRUIN, a unified A] system that can perform both problem-solving and language comprehension tasks. Included in the system is a frame-based knowledge-representation language called FRAIL, a problem solving component called NASL (which is based on McDermott's problem-solving language of the same name), and a context-recognition component(More)
This article describes a novel approach to the real-time visualization of 3D imagery obtained from a 3D millimeter wave radar and the associated sensor fusion modules. The MMW radar system uses two scanning beams to provide all weather 3D distance measurements of objects appearing on the ground. This information is displayed using our high-end 3D(More)
The purpose of the eXternal Visibility System (XVS) effort for NASA's High-Speed Research Program was to determine and to provide required pilot visual information for a High Speed Civil Transport vehicle concept to allow safe and efficient operation in the absence of forward windows. The objective of this preliminary experiment conducted at NASA Langley(More)
BACKGROUND The safety of simultaneous resections of colorectal cancer and synchronous liver metastases (SCRLM) is not established. This multi-institutional retrospective study compared postoperative outcomes after simultaneous and staged colorectal and hepatic resections. METHODS Clinicopathologic data, treatments, and postoperative outcomes from patients(More)
  • Anthony P. Bartolone, Monica F. Hughes, Douglas T. Wong, Mohammad A. Takallu
  • 2004
Spatial disorientation induced by inadvertent flight into instrument meteorological conditions (IMC) continues to be a leading cause of fatal accidents in general aviation. The Synthetic Vision Systems – General Aviation (SVS-GA) research element, an integral part of NASA's Aviation Safety and Security Program (AvSSP), is investigating a revolutionary(More)
Since its founding, NASA has been dedicated to the advancement of aeronautics and space science. The NASA Scientific and Technical Information (STI) Program Office plays a key part in helping NASA maintain this important role. The NASA STI Program Office is operated by Langley Research Center, the lead center for NASA's scientific and technical information.(More)
  • D Wong, A Plumb
  • 1986
A computer program was designed for automated visual acuity testing, the aim of which was to evaluate the effectiveness of such systems in a busy out-patient department. The time required for explanation and performing the automated test was compared with that taken by nurses measuring visual acuities in the conventional manner using a Snellen's chart. The(More)
We are interested in the role that "common-sense knowledge" plays in our ability to understand natural language. Because problemsolving systems have similar knowledge requirements, we are studying the relation between language comprehension on one hand, and problem-solving systems, including much of what goes under the heading of "knowledge engineering", on(More)
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