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Dinosaur hearing, listening to muscle noise, quieter cubicles

captured voice-production events as short as 0.0316 seconds and as long as 100 s. On average, the teachers had 1,800 occurrences of voicing per hour at work, compared to 1,200 per hour during non-work periods (for a total of as many as 20,000 per day). Voicing occurred 23 percent of the total time at work and diminished to 13 percent during off-work hours and 12 percent on weekends. According to Titze and Hunter, the study helps pave the way for understanding vocal fatigue in terms of repetitive motion (voice on/off) and collision (vibration) of tissue, as well as how the voice can recover from physical stress (5aSC12).

DETECTING BREAST LESIONS WITH VIBRO-ACOUSTOGRAPHY

Vibro-acoustography (VA) is a non-invasive imaging technique using ultrasound to search for lesions in breast tissue. Generally the rival approaches to breast imaging have their weaknesses and strengths. Mammography (using x rays) has trouble detecting lesions in dense breasts often seen in young women. Conventional ultrasound can spot lesions but cannot measure tissue stiffness, a leading indicator of malignancy. By contrast, VA induces a small-scale vibration in the tissue, and it is this low-frequency signal that provides the crucial information about tissue stiffness. Azra Alizad (aza@mayo.edu), who works at the Mayo Clinic, the pioneer in vibro-acoustography research, says that this technique should allow physicians to identify cancer lesions and other abnormalities with higher sensitivity and specificity. Extensive tests of the VA imaging technique have been carried out at the Mayo Clinic. (3aBBa7)

WORKPLACE SPEECH PRIVACY CALCULATOR

Open-plan offices (cubicles) are here to stay. Construction trends continue to bring workers out of private offices and into the open-plan setting. While an open environment fosters accessibility, there is a great need for solutions that counteract the acoustical effects
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Source:American Institute of Physics


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