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Author: zachary levine

Displaying records 11 to 20 of 103 records.
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11. A Low Cost Fiducial Reference for Computed Tomography
Published: 11/11/2008
Authors: Zachary H Levine, Steven E Grantham, Daniel S Sawyer, Anthony P Reeves, David F Yankelevitz
Abstract: Rationale and Objectives. To detect the growth in lesions, it is necessary to ensure that the apparent changes in size are above the noise floor of the system. By introducing a fiducial reference, it may be possible to detect smaller changes in le ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=842437

12. Diffraction and Electron Energy Loss to Plasmons in Silicon Slabs
Published: 3/10/2008
Author: Zachary H Levine
Abstract: Dynamic diffraction patterns have been calculated for 25-nm thick slabs of silicon with [001], [111], and [110] faces for a 120 keV electron beam. The calculation used the mixed dynamical form factor in the dielectric formulation. Dielectric matric ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=840261

13. The Magic Angle Mystery in Electron Energy Loss Spectra: Relativistic and Dielectric Corrections
Published: 1/2/2008
Authors: A P Sorini, J J Rehr, Zachary H Levine
Abstract: Recently it has been demonstrated that a careful treatment of both longitudinal and transverse matrix elements in electron energy loss spectra can explain the mystery of relativistic effects on the magic angle. Here we show that there is an addition ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=840276

14. Controlling the Band Gap in Zigzag Graphene Nanoribbons With an Electric Field Induced by a Polar Molecule
Published: 1/1/2008
Authors: Sergio Dalosto, Zachary H Levine
Abstract: Graphene nanoribbons with both armchair- and zigzag-shaped hydrogen-passivated edges (AGNR and ZGNR) have band gaps. Son et al. showed that the gap s value depends on the width of the ribbon and that the application of a uniform external electric fi ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=840264

15. Optical to UV spectra and birefringence of SiO2 and TiO2:  first-principles calculations with excitonic effects
Published: 1/1/2008
Authors: H M Lawler, J J Rehr, F Vila, SD Dalosto, Eric L Shirley, Zachary H Levine
Abstract: A first-principles approach is presented for calculations of optical to ultraviolet spectra including excitonic effects.  The approach is based on the Bethe-Salpeter equation calculations using the NBSE code combined with ABINIT.  The appro ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=842466

16. Synthetic Incoherence for Electron Microscopy
Published: 7/11/2007
Authors: Zachary H Levine, Robyn M Dunstan
Abstract: Tomographic studies of submicrometer samples in materials science using electron microscopy have been inhibited by diffraction effects. In the present work, we describe two practical methods for ameliorating these effects. In one, the sample is sca ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=840249

17. Alignment of Fiducial Marks in a Tomographic Tilt Series with an Unknown Rotation Axis
Published: 4/1/2007
Authors: Zachary H Levine, Peter Volkovitsky, Howard Hung
Abstract: Alignment for tomography using a transmission electron microscopy frequently uses colloidal gold particles as fiducial reference marks. Typically, there is an implicit assumption that the tilt axis of the tomographic series is orthogonal to the beam ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=906668

18. Bayesian Tomography for Projections With an Arbitrary Transmission Function With an Application in Electron Microscopy
Series: Journal of Research (NIST JRES)
Published: 12/1/2006
Authors: Zachary H Levine, Anthony J Kearsley, John G Hagedorn
Abstract: The vast majority of the developments in tomography assume that the transmission of the probe trhought he sample follows Beer s Law, i.e., the rule of exponential attenuation. However, for transmission electron microscopy of samples a few times thei ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=840283

19. Synthetic Incoherence Via Scanned Gaussian Beams
Series: Journal of Research (NIST JRES)
Published: 12/1/2006
Author: Zachary H Levine
Abstract: Tomography, in most formulations, requires an incoherent signal. For a conventional transmission electron microscope, the coherence of the beam often results in diffraction effects which limit the utility of a tilt series with conventional tomograph ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=840245

20. Wake Fields in the Electron Gas, Including Transverse Response
Published: 12/1/2006
Authors: Eric J Cockayne, Zachary H Levine
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=854181



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