Out-of-plane scattering from glass waveguides: comparison of theory and experiment

1982 ◽  
Vol 7 (5) ◽  
pp. 235 ◽  
Author(s):  
Eric Bradley ◽  
D. G. Hall
Keyword(s):  
Glass Waveguides ◽  
Out Of Plane ◽  
Theory And Experiment

Force field for out-of-plane vibrations of pyrazine

1986 ◽  
Vol 51 (12) ◽  
pp. 2656-2664 ◽  
Author(s):  
Juan F. Arenas ◽  
Juan I. Marcos ◽  
Juan T. Lopez-Navarrete ◽  
Juan C. Otero
Keyword(s):  
Force Field ◽  
Theoretical Data ◽  
Force Constants ◽  
Second Derivatives ◽  
Out Of Plane ◽  
Quadratic Force Field ◽  
Derivatives Of ◽  
Theory And Experiment

A general quadratic force field has been calculated for the out-of-plane vibrations of pyrazine by the MINDO/3 method. The first derivatives of the energy were computed analytically and the second derivatives of energy numerically. The force constants so obtained have been refined to fit the observed frequencies of -h4, -d4 and cis-pyrazine-d2. The calculations proved our assignment suggested previously, though the disagreement between theory and experiment for the Au vibrations of pyrazine needs additional experimental and theoretical data for clarification.

The Effect of Thermal Prestress on the Free Vibration Characteristics of Clamped Rectangular Plates: Theory and Experiment

1997 ◽  
Vol 119 (2) ◽  
pp. 243-249 ◽  
Author(s):  
K. D. Murphy ◽  
L. N. Virgin ◽  
S. A. Rizzi
Keyword(s):  
Free Vibration ◽  
Experimental Approach ◽  
Natural Frequencies ◽  
Vibration Characteristics ◽  
Rectangular Plates ◽  
Modal Coupling ◽  
Out Of Plane ◽  
Post Buckling ◽  
Initial Geometric Imperfections ◽  
Theory And Experiment

In a combined theoretical and experimental approach, the free vibration characteristics of a uniformly heated, fully clamped (out-of-plane), rectangular plate are considered. Specifically, this work focuses on the behavior of the small amplitude natural frequencies as the temperature is increased from the ambient. The effects of initial geometric imperfections, modal coupling, imperfect clamping (in-plane) and post-buckling are addressed. Comparisons between theory and experiment show excellent agreement.

Electrostatic optics and aberration correction in the 1940s and today

1992 ◽  
Vol 50 (1) ◽  
pp. 6-7
Author(s):  
Gertrude F. Rempfer
Keyword(s):  
Electron Microscope ◽  
Focal Point ◽  
Focal Length ◽  
High Vacuum ◽  
Electron Optics ◽  
Applied Physics ◽  
Electrostatic Lenses ◽  
Commercial Instrument ◽  
The University ◽  
Theory And Experiment

I became involved in electron optics in early 1945, when my husband Robert and I were hired by the Farrand Optical Company. My husband had a mathematics Ph.D.; my degree was in physics. My main responsibilities were connected with the development of an electrostatic electron microscope. Fortunately, my thesis research on thermionic and field emission, in the late 1930s under the direction of Professor Joseph E. Henderson at the University of Washington, provided a foundation for dealing with electron beams, high vacuum, and high voltage.At the Farrand Company my co-workers and I used an electron-optical bench to carry out an extensive series of tests on three-electrode electrostatic lenses, as a function of geometrical and voltage parameters. Our studies enabled us to select optimum designs for the lenses in the electron microscope. We early on discovered that, in general, electron lenses are not “thin” lenses, and that aberrations of focal point and aberrations of focal length are not the same. I found electron optics to be an intriguing blend of theory and experiment. A laboratory version of the electron microscope was built and tested, and a report was given at the December 1947 EMSA meeting. The micrograph in fig. 1 is one of several which were presented at the meeting. This micrograph also appeared on the cover of the January 1949 issue of Journal of Applied Physics. These were exciting times in electron microscopy; it seemed that almost everything that happened was new. Our opportunities to publish were limited to patents because Mr. Farrand envisaged a commercial instrument. Regrettably, a commercial version of our laboratory microscope was not produced.

Grain separation enhanced magnetic coercivity in Pt/Co multilayers.

1993 ◽  
Vol 51 ◽  
pp. 1038-1039 ◽  
Author(s):  
G.A. Bertero ◽  
R. Sinclair
Keyword(s):  
Remanent Magnetization ◽  
Strong Influence ◽  
Uniaxial Anisotropy ◽  
Magnetic Coupling ◽  
Recording Media ◽  
Magnetic Media ◽  
Signal To Noise ◽  
Out Of Plane ◽  
Longitudinal Recording ◽  
The Relationship

Pt/Co multilayers displaying perpendicular (out-of-plane) magnetic anisotropy and 100% perpendicular remanent magnetization are strong candidates as magnetic media for the next generation of magneto-optic recording devices. The magnetic coercivity, Hc, and uniaxial anisotropy energy, Ku, are two important materials parameters, among others, in the quest to achieving higher recording densities with acceptable signal to noise ratios (SNR). The relationship between Ku and Hc in these films is not a simple one since features such as grain boundaries, for example, can have a strong influence on Hc but affect Ku only in a secondary manner. In this regard grain boundary separation provides a way to minimize the grain-to-grain magnetic coupling which is known to result in larger coercivities and improved SNR as has been discussed extensively in the literature for conventional longitudinal recording media.We present here results from the deposition of two Pt/Co/Tb multilayers (A and B) which show significant differences in their coercive fields.

Electronic properties of TTF-TCNQ : a connection between theory and experiment

1978 ◽  
Vol 39 (12) ◽  
pp. 1355-1363 ◽  
Author(s):  
L.G. Caron ◽  
M. Miljak ◽  
D. Jerome
Keyword(s):  
Electronic Properties ◽  
Theory And Experiment

Multineuronal structures: theory and experiment.

1986 ◽  
Vol 150 (10) ◽  
pp. 321
Author(s):  
V.L. Dunin-Barkovskii
Keyword(s):  
Theory And Experiment
Sign in / Sign up

Export Citation Format

Share Document