High spatial density measurements of the vibro‐acoustic response of some aircraft structures

2000 ◽  
Vol 107 (5) ◽  
pp. 2798-2799
Author(s):  
Peter C. Herdic ◽  
Brian H. Houston ◽  
Earl G. Williams
Keyword(s):  
Spatial Density ◽  
Acoustic Response ◽  
Aircraft Structures ◽  
Density Measurements

scholarly journals Novel technique for the extraction of ionization profiles from spatial density measurements

2001 ◽  
Vol 72 (12) ◽  
pp. 4362-4365 ◽  
Author(s):  
C. M. Deegan ◽  
C. E. Markham ◽  
M. Turner ◽  
D. Vender
Keyword(s):  
Spatial Density ◽  
Density Measurements ◽  
Novel Technique

Reconstruction of Objects from their Projections Using Orthogonal Functions

1973 ◽  
Vol 31 ◽  
pp. 268-269
Author(s):  
Elrnar Zeitler
Keyword(s):  
Unit Area ◽  
Three Dimensional ◽  
One Dimension ◽  
Spatial Density ◽  
Dimensional Representation ◽  
Orthogonal Functions ◽  
Object A ◽  
Plane Normal ◽  
Dimensional Object ◽  
Spatial Density Distribution

Considering any finite three-dimensional object, a “projection” is here defined as a two-dimensional representation of the object's mass per unit area on a plane normal to a given projection axis, here taken as they-axis. Since the object can be seen as being built from parallel, thin slices, the relation between object structure and its projection can be reduced by one dimension. It is assumed that an electron microscope equipped with a tilting stage records the projectionWhere the object has a spatial density distribution p(r,ϕ) within a limiting radius taken to be unity, and the stage is tilted by an angle 9 with respect to the x-axis of the recording plane.

Theoretical research of electron-density measurements of plane targets using soft XRL deflectometry

2001 ◽  
Vol 11 (PR2) ◽  
pp. Pr2-479-Pr2-481
Author(s):  
C. Ye ◽  
G. Zhang ◽  
T. Zhang ◽  
H. Peng ◽  
W. Zheng
Keyword(s):  
Electron Density ◽  
Theoretical Research ◽  
Density Measurements

Fabrication of Nanoscale Hydrophobic Regions on Anodic Alumina for Selective Adhesion of Biologic Molecules

2003 ◽  
Vol 773 ◽  
Author(s):  
Xiefan Lin ◽  
Anthony S. W. Ham ◽  
Natalie A. Villani ◽  
Whye-Kei Lye ◽  
Qiyu Huang ◽  
...  
Keyword(s):  
Anodic Alumina ◽  
Biological Molecules ◽  
Spatial Density ◽  
Length Scale ◽  
Adhesion Sites ◽  
A Cell ◽  
Adhesive Molecules ◽  
Receptor Clusters ◽  
Molecular Bonding ◽  
Fabrication Parameters

AbstractStudies of selective adhesion of biological molecules provide a path for understanding fundamental cellular properties. A useful technique is to use patterned substrates, where the pattern of interest has the same length scale as the molecular bonding sites of a cell, in the tens of nanometer range. We employ electrochemical methods to grow anodic alumina, which has a naturally ordered pore structure (interpore spacing of 40 to 400 nm) controlled by the anodization potential. We have also developed methods to selectively fill the alumina pores with materials with contrasting properties. Gold, for example, is electrochemically plated into the pores, and the excess material is removed by backsputter etching. The result is a patterned surface with closely separated islands of Au, surrounded by hydrophilic alumina. The pore spacing, which is determined by fabrication parameters, is hypothesized to have a direct effect on the spatial density of adhesion sites. By attaching adhesive molecules to the Au islands, we are able to observe and study cell rolling and adhesion phenomena. Through the measurements it is possible to estimate the length scale of receptor clusters on the cell surface. This information is useful in understanding mechanisms of leukocytes adhesion to endothelial cells as well as the effect of adhesion molecules adaptation on transmission of extracellular forces. The method also has applications in tissue engineering, drug and gene delivery, cell signaling and biocompatibility design.

Quantitative density measurements by Rayleigh scattering behind a plane turbine cascade

AIAA Journal ◽  
1997 ◽  
Vol 35 ◽  
pp. 1303-1308 ◽  
Author(s):  
K. Fiedler ◽  
O. Seiber ◽  
C. Jakiel
Keyword(s):  
Rayleigh Scattering ◽  
Turbine Cascade ◽  
Density Measurements
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