By C. J. Date
Carrying on with within the 8th variation, An creation to Database structures offers a accomplished creation to the now very huge box of database structures via delivering a pretty good grounding within the foundations of database expertise whereas laying off a few mild on how the sector is probably going to enhance sooner or later. This re-creation has been rewritten and increased to stick present with database process tendencies.
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Additional info for An Introduction to Database Systems (8th Edition)
In addition to the type of noise and its intensity, the chronology of noise in the course of the night, the alternation of different intensities, and the relation b e t w e e n foreground and background noises play also a considerable role. This has b e e n clearly proven by the experiments of Schieber (1968) on noises of automobile traffic and airplane noises. R e d u c e d automobile traffic was found to disturb sleep more than intense traffic with equivalent foreground and background noise. This leads to conclude that habit to noise is p e r h a p s easier to achieve when noises are regular and frequent than when they are rare and irregular.
F o r example, e x p o s u r e for 8 h o u r s a day, 5 days a week to noise having an overall sound-pressure level of 102 dB produced the median hearing loss at 4000 H z shown in Fig. 3. The subjects were male w o r k e r s . , 1964) having an overall sound-pressure level ranging from 87 to 102 dB produced the median hearing loss in female jute weavers shown in Fig. 4. It may be seen that the hearing loss progresses most rapidly at a frequency near 4000 H z . T h u s , measure- Introduction 27 Age (Years) 19 23 27 31 35 39 43 47 51 55 59 63 60 Hearing Level (dB) 50 40 30 20 10 0 -10 10 1 I I—I I I I I 14 18 22 26 30 34 38 Exposure Time (Years) Fig.
This suggests first that the operators are u n a w a r e of the possibility of hearing d a m a g e , and, p e r h a p s more important, that damage risk criteria for s u m m e r j o b s and seasonal w o r k , and for w e e k e n d e x p o s u r e , are n e e d e d . If the sound pressures are even higher, of the order of 130 d B , no one ought to be e x p o s e d , no matter h o w short the time or h o w good the ear protection. THE BURNS AND ROBINSON STUDY AND THE 1974 EPA REPORT All the preceding questions are a n s w e r e d by t w o r e c e n t studies which are a landmark in our ability to assess risk of hearing d a m a g e .
An Introduction to Database Systems (8th Edition) by C. J. Date