Human Hearing

Non-body smells (e.g., fragrances, ambient odors) can make me feel sexually aroused.. Hearing human sexual sounds can make me feel sexually aroused. 

Half-power point, 122 Half-wave rectifier, 155 Harmonics, 142, 182 Haywire circuits, 62 footnote Hearing, human, 44, 121 Heat, 61, 101, 212, 236 effect onR, 147, 150 sink, 160, 174 Henry, 113 hfe, 172... 

Maximizing Human Potential Decade of the Brain 1990—2000, Report of the Subcommittee on Brain and Behavioral Sciences, Office of Science and Technology Pohcy, Washington, D.C., 1991, p. 76 A. M. Chutorian, C. P. LaScala, C. N. Ores, and R. Nass, PediatNeurol 1, 335 (1985) C. S. Wing, Lang. Speech, Hear. Sere. Schools 21, 22 (1990). 

For airborne sound, the reference pressure is 2 X 10" Pa (29 X psi), which is nominally the human threshold of hearing at 1000 Hz. The corresponding sound pressure level is 0 dB. Conversation is about 50 dB, ana a Jackhammer operator is subject to 100 dB. Extreme levels such as a jet engine at takeoff might produce 140 dB at a distance of 3 m, which is a pressure amplitude oi 200 Pa (29 X 10" psi). These examples demonstrate both the sensitivity and wide dynamic range of the human ear. 

Xia, Y, and Zhao, R. (1999). Effects of air turbulence on human thermal sensation in warm rsotliermal environment. The Third International Symposium on Hearing, Ventilation and Air Conditioning, 1 147-152. 

You may be able to collect a great deal of useful input via personal conversations about the new systems. This avoids the more costly survey approach, but is also more likely to be biased. Generally, any voluntary opinions are more likely to be negative human nature is such that complaints are more common than praise. (When did you last thank your bank for improved service When did you last complain to them ). Ideally, you should set aside a period when you simply spend time meeting with other staff and discussing the new systems. If you are given, or hear of, complaints informally, check them out by asking others their opinion. 

For convenience, the usual measurement of sound is expressed in decibels (dB), and ratings go from threshold of hearing to threshold of pain (135 dB). Figure 34.11 illustrates the common noise criteria, which can be expressed in sound-pressure levels (SPL). The human ear can detect 1 dB but 6 dB represents a doubling of the SPL, although it would need a 10 dB increase to make it sound twice as loud. 

Of historical interest may be the use of a half dollar coin (the lighter weight 250 not as efficient). During the early 1940s the coin tap test was used very successfully in evaluating the performances of plastics, particularly RP primary aircraft structures. With a good ear (human hearing ear) there was (and is) a definite different sound between a satisfactory and unsatisfactory RP product. The unsatisfactory product would contain voids, delaminations, defects in fiber distribution, etc. In... 

HCMV is widespread in the human population. In immunocompetent individuals, the infection is inapparent or associated with mild symptoms. However, HCMV is frequently transmitted perinatally and is the leading cause of neurological disease and hearing loss in congenitally infected newborns, affecting some 8,000 newborns per year in USA alone (Arvin and Alford 1990). Furthermore, following the first 100 days after transplantation, HCMV-induced pneumonia develops in about 50%... 

By way of a specific example let us consider erucic acid. The main commercial source of erucic acid is a specially bred form of rape seed (HEAR) as pointed out above. With European consumption being around 60 000 tpa almost 40 000 ha of land are used to grow rapeseed for erucic acid production in Europe. The high level of erucic found in this type of rape seed oil make it unsuitable for human consumption, owing to the indigestibility of such large amounts of this acid. Erucic acid is also the major fatty acid to be found in nasturtium and crambe seeds (up to 75% and 56% respectively), and it is also found in the salad herb, rocket. 

Ultrasound spans the frequencies of roughly 20 KHz to 10 MHz (human hearing has an upper limit of <18 KHz). Since the velocity of sound in liquids is 1500 m/sec, ultrasound has acoustic wavelengths of roughly 7.5 to 0.015 cm. Clearly no direct coupling of the acoustic field with chemical species on a molecular level can account for sonochemistry. Instead, the chemical effects of ultrasound derive from several different physical mechanisms, depending on the nature of the system. 

Two other myosin types have been implicated in hearing and vestibular function [62]. The defect in the Snell s waltzer mouse was found to be a mutation in a myosin VI gene that produces degeneration of the cochlea and vestibular apparatus. Myosin VI is localized to the cuticular plate of the hair cell under stereocilia. Similarly, mutations in a myosin VII gene are responsible for the shaker-1 mouse and several human genetic deafness disorders. This myosin, myosin Vila, is found in a band near the base of the stereocilia distinct from distributions of myosin ip and myosin VI. 

The crackle we sometimes hear when walking round a radio set is because of metals and other conductors in our clothing human flesh is invisible to radio waves. 

Instead of relying on odor the wasps may detect caterpillars by sound. Both ants and caterpillars stridulate, or produce sounds, and they do so in similar rhythms. When amplified, their songs sound different to human ears, and maybe they do to wasps as well. Here again, the problem arises of detecting signals from caterpillars greatly outnumbered by ants. Could the wasp s hearing be so acute The puzzle remains unsolved. 

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