Interaction Radiation Resistance for a Line Array of Two and Three Magnetostrictive‐Stack Transducers at an Air‐Water Surface

1964 ◽  
Vol 36 (1) ◽  
pp. 174-176 ◽  
Author(s):  
F. B. Stumpf
Keyword(s):  
Radiation Resistance ◽  
Water Surface ◽  
Line Array

A Modal Intensity Distribution Estimation Algorithm Based on Horizontal Circular Array

2019 ◽  
Vol 28 (01) ◽  
pp. 1950006
Author(s):  
Peng Li ◽  
Xinhua Zhang ◽  
Bing Liu ◽  
Lanrui Li ◽  
Jun Li
Keyword(s):  
Intensity Distribution ◽  
Water Surface ◽  
Interference Suppression ◽  
Estimation Algorithm ◽  
Circular Array ◽  
Data Simulation ◽  
Simulation Experiments ◽  
Theoretical Derivation ◽  
Line Array ◽  
Extraction Algorithm

In shallow-water waveguide, the normal mode information of acoustic signals plays an important role in localization research. In this paper, an extraction algorithm of modal intensity distribution based on horizontal circular array is proposed. By using the horizontal wavenumber of each mode, the modal domain beamforming is used to estimate the modal intensity distribution of the acoustic signal. The theoretical derivation, data simulation and experimental data are used to verify the feasibility of the algorithm based on circular array and the superiority compared with the line array extraction algorithm. At the last part of the paper, an application based on modal intensity distribution is proposed: water surface interference suppression, and the effectiveness of the interference suppression algorithm is verified from theoretical derivation and simulation experiments.

Immunoferritin localization of intracellular antigens in positively stained frozen sections

1978 ◽  
Vol 36 (2) ◽  
pp. 168-169
Author(s):  
K. T. Tokuyasu
Keyword(s):  
Surface Tension ◽  
Water Surface ◽  
Thin Layers ◽  
The Other ◽  
Positive Staining ◽  
Frozen Sections ◽  
The Past ◽  
Ultrathin Frozen Sections ◽  
Definition Of

During the past investigations of immunoferritin localization of intracellular antigens in ultrathin frozen sections, we found that the degree of negative staining required to delineate u1trastructural details was often too dense for the recognition of ferritin particles. The quality of positive staining of ultrathin frozen sections, on the other hand, has generally been far inferior to that attainable in conventional plastic embedded sections, particularly in the definition of membranes. As we discussed before, a main cause of this difficulty seemed to be the vulnerability of frozen sections to the damaging effects of air-water surface tension at the time of drying of the sections.Indeed, we found that the quality of positive staining is greatly improved when positively stained frozen sections are protected against the effects of surface tension by embedding them in thin layers of mechanically stable materials at the time of drying (unpublished).

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