Symmetry Properties of Acoustic Fields

Time Reversal Acoustics ◽

10.1007/978-981-16-3235-8_1 ◽

2021 ◽

pp. 1-6

Author(s):

Woon Siong Gan

Keyword(s):

Acoustic Fields ◽

Symmetry Properties

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Symmetry properties of acoustic fields in piezoelectrics and their implementation in FEM simulations of the SAW propagation

2010 IEEE International Ultrasonics Symposium ◽

10.1109/ultsym.2010.5935477 ◽

2010 ◽

Author(s):

Alexander Darinskii ◽

Manfred Weihnacht ◽

Hagen Schmidt

Keyword(s):

Acoustic Fields ◽

Fem Simulations ◽

Symmetry Properties

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Semi-automated methods for 3-D reconstruction of macromolecular complexes

Proceedings, annual meeting, Electron Microscopy Society of America ◽

10.1017/s0424820100136581 ◽

1995 ◽

Vol 53 ◽

pp. 42-43

Author(s):

B. Carragher ◽

M. Whittaker

Keyword(s):

Three Dimensional ◽

Time Saving ◽

Macromolecular Complexes ◽

Symmetry Properties ◽

Dimensional Reconstruction ◽

Experienced Operator ◽

Projection Images ◽

The Individual ◽

Natural Symmetry

Techniques for three-dimensional reconstruction of macromolecular complexes from electron micrographs have been successfully used for many years. These include methods which take advantage of the natural symmetry properties of the structure (for example helical or icosahedral) as well as those that use single axis or other tilting geometries to reconstruct from a set of projection images. These techniques have traditionally relied on a very experienced operator to manually perform the often numerous and time consuming steps required to obtain the final reconstruction. While the guidance and oversight of an experienced and critical operator will always be an essential component of these techniques, recent advances in computer technology, microprocessor controlled microscopes and the availability of high quality CCD cameras have provided the means to automate many of the individual steps.During the acquisition of data automation provides benefits not only in terms of convenience and time saving but also in circumstances where manual procedures limit the quality of the final reconstruction.

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