Versatile System for High‐Intensity Sonic‐Fatigue Testing

1962 ◽  
Vol 34 (12) ◽  
pp. 1989-1990
Author(s):  
John J. Van Houten
Keyword(s):  
High Intensity ◽  
Fatigue Testing ◽  
Sonic Fatigue

Ultra High Bypass Aircraft Sonic Fatigue

1989 ◽  
Vol 32 (4) ◽  
pp. 26-34
Author(s):  
Daniel Lorch
Keyword(s):  
Structural Design ◽  
High Intensity ◽  
Fatigue Cracks ◽  
Wave Tube ◽  
Transport Aircraft ◽  
Sonic Fatigue ◽  
Propeller Blades ◽  
The 1960S ◽  
Treatment Designs ◽  
Treatment Design

The development of the Ultra High Bypass (UHB) engine for transport aircraft introduces sonic fatigue as a major structural design challenge. UHB engines generate high intensity acoustic tones associated with the harmonics of the propeller blades. Current analysis methods and structural design approaches to prevent sonic fatigue cracks are based on techniques developed in the 1960s for broadband random jet-noise excitation. The high intensity noise testing and analysis completed to develop a sonic fatigue treatment design for the UHB Demonstrator aircraft are discussed. The evaluation included progressive wave tube (PWT) and shaker table testing conducted on representative aircraft components in the laboratory. Also discussed are the sonic fatigue treatment designs developed and flight tested on the UHB Demonstrator aircraft by Douglas Aircraft Company. The tests proved that lightweight and inexpensive treatments can be developed that will provide protection against sonic fatigue.

A New High Intensity Grid Cap for RCA-EMU-3 Electron Microscopes

1968 ◽  
Vol 26 ◽  
pp. 316-317
Author(s):  
George Christov ◽  
Bolivar J. Lloyd
Keyword(s):  
Electron Beam ◽  
Electron Microscope ◽  
High Voltage ◽  
High Intensity ◽  
Electron Gun ◽  
Tungsten Filament ◽  
Fluorescent Screen ◽  
Electron Microscopes ◽  
Pass Through ◽  
Ground Potential

A new high intensity grid cap has been designed for the RCA-EMU-3 electron microscope. Various parameters of the new grid cap were investigated to determine its characteristics. The increase in illumination produced provides ease of focusing on the fluorescent screen at magnifications from 1500 to 50,000 times using an accelerating voltage of 50 KV.The EMU-3 type electron gun assembly consists of a V-shaped tungsten filament for a cathode with a thin metal threaded cathode shield and an anode with a central aperture to permit the beam to course the length of the column. The cathode shield is negatively biased at a potential of several hundred volts with respect to the filament. The electron beam is formed by electrons emitted from the tip of the filament which pass through an aperture of 0.1 inch diameter in the cap and then it is accelerated by the negative high voltage through a 0.625 inch diameter aperture in the anode which is at ground potential.

260: High Intensity Focused Ultrasound Combined with Endocrine Therapy in Treating High or Intermediate Risk Prostate Cancer

2006 ◽  
Vol 175 (4S) ◽  
pp. 86-86
Author(s):  
Makoto Sumitomo ◽  
Junichi Asakuma ◽  
Yasumasa Hanawa ◽  
Kazuhiko Nagakura ◽  
Masamichi Hayakawa
Keyword(s):  
Prostate Cancer ◽  
Endocrine Therapy ◽  
High Intensity ◽  
Focused Ultrasound ◽  
High Intensity Focused Ultrasound ◽  
Intermediate Risk ◽  
Risk Prostate Cancer

1400: Early Clinical Experience Using High-Intensity Focused Ultrasound for the Treatment of Renal Tumours

2005 ◽  
Vol 173 (4S) ◽  
pp. 379-380
Author(s):  
James E. Kennedy ◽  
Rowland O. Illing ◽  
Feng Wu ◽  
Gail R. ter Haar ◽  
Rachel R. Phillips ◽  
...  
Keyword(s):  
Clinical Experience ◽  
High Intensity ◽  
Focused Ultrasound ◽  
High Intensity Focused Ultrasound ◽  
Early Clinical Experience ◽  
Renal Tumours
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