scholarly journals Phase Measurement of Galvanneal Task JPL Task Order Number: RF-152 Amendment Number: 543

1995 ◽  
Author(s):  
Lynn Lowry ◽  
Beverly Tai
Keyword(s):  
Phase Measurement ◽  
Order Number ◽  
Task Order

Performance and applications of the holography electron microscope

1993 ◽  
Vol 51 ◽  
pp. 1078-1079
Author(s):  
Akira Tonomura
Keyword(s):  
Electron Beam ◽  
Electron Microscope ◽  
Phase Measurement ◽  
Electron Holography ◽  
Imaging Method ◽  
High Contrast ◽  
Magnetic Lens ◽  
High Brightness ◽  
Holographic Imaging ◽  
Dynamic Observation

Electron holography is a two-step imaging method. However, the ultimate performance of holographic imaging is mainly determined by the brightness of the electron beam used in the hologram-formation process. In our 350kV holography electron microscope (see Fig. 1), the decrease in the inherently high brightness of field-emitted electrons is minimized by superposing a magnetic lens in the gun, for a resulting value of 2 × 109 A/cm2 sr. This high brightness has lead to the following distinguished features. The minimum spacing (d) of carrier fringes is d = 0.09 Å, thus allowing a reconstructed image with a resolution, at least in principle, as high as 3d=0.3 Å. The precision in phase measurement can be as high as 2π/100, since the position of fringes can be known precisely from a high-contrast hologram formed under highly collimated illumination. Dynamic observation becomes possible because the current density is high.

Potential Task Order Effects in Computer Test Batteries (Summary)

1997 ◽  
Author(s):  
Mark Czarnolewski ◽  
John Eliot ◽  
Jennifer Rinehart
Keyword(s):  
Order Effects ◽  
Task Order

Task Order 2 Enhanced Preliminary Assessment, Fort Douglas, Salt Lake City, Utah

1989 ◽  
Author(s):  
Mukesh G. Mirchandani ◽  
Glenn M. Johnson ◽  
Lawrence J. Bove
Keyword(s):  
Salt Lake ◽  
Salt Lake City ◽  
Preliminary Assessment ◽  
Task Order ◽  
Lake City
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