Specular‐ray parameter extraction and stationary phase migration

2000 ◽  
Author(s):  
Jing Chen
Keyword(s):  
Stationary Phase ◽  
Parameter Extraction ◽  
Ray Parameter

Specular ray parameter extraction and stationary‐phase migration

Geophysics ◽  
2004 ◽  
Vol 69 (1) ◽  
pp. 249-256 ◽  
Author(s):  
Jing Chen
Keyword(s):  
Stationary Phase ◽  
Seismic Reflection ◽  
Parameter Extraction ◽  
Phase Approximation ◽  
Full Data ◽  
Prestack Depth Migration ◽  
Depth Migration ◽  
Kirchhoff Type ◽  
Migration Operator ◽  
Ray Parameter

The Kirchhoff‐type prestack depth migration operator is a diffraction stack of seismic reflection energies over seismic traces. Typically, the diffraction stack is carried out over the full data aperture, producing not only images of reflectors but also aliasing artifacts. Aliasing artifacts often break reflector continuity in images. The stationary‐phase approximation to the migration operator shows that, for image points on reflectors, traces within the neighborhood of specular rays contribute most to the diffraction stack. Traces outside this vicinity introduce aliasing artifacts into the image, especially in the case of coarse trace spacing and aperture truncation. A new migration algorithm, denoted as stationary‐phase migration, is proposed to find the specular ray parameters and then to migrate the specular‐ray energies and reject nonspecular ray energies to yield images with less aliasing.

Morphological Characterization of Mycobacteriophage R1

1974 ◽  
Vol 32 ◽  
pp. 254-255
Author(s):  
B. L. Soloff ◽  
T. A. Rado
Keyword(s):  
Carbon Source ◽  
Stationary Phase ◽  
Growth Phase ◽  
Minimal Medium ◽  
Morphological Characterization ◽  
Logarithmic Growth Phase ◽  
Complete Lysis ◽  
Lysogenic Culture ◽  
Logarithmic Growth

Mycobacteriophage R1 was originally isolated from a lysogenic culture of M. butyricum. The virus was propagated on a leucine-requiring derivative of M. smegmatis, 607 leu−, isolated by nitrosoguanidine mutagenesis of typestrain ATCC 607. Growth was accomplished in a minimal medium containing glycerol and glucose as carbon source and enriched by the addition of 80 μg/ ml L-leucine. Bacteria in early logarithmic growth phase were infected with virus at a multiplicity of 5, and incubated with aeration for 8 hours. The partially lysed suspension was diluted 1:10 in growth medium and incubated for a further 8 hours. This permitted stationary phase cells to re-enter logarithmic growth and resulted in complete lysis of the culture.

Chiral drugs separation by a new antibiotics-based chiral stationary phase

2014 ◽  
Author(s):  
Chunye Liu ◽  
Yanqing Miao ◽  
Yihui Guo ◽  
Yinjuan An ◽  
Yunfang Li ◽  
...  
Keyword(s):  
Stationary Phase ◽  
Chiral Stationary Phase ◽  
Chiral Drugs ◽  
New Antibiotics
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