Read e-book online Hydronautics PDF

By Herman E. Sheets

ISBN-10: 0126391505

ISBN-13: 9780126391503

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I Ocean Resources / 35 The first micro-organism may function as a processor of fish, and also as a food source for the second bacterium or micro-organism, and so on. These organisms are thus provided an optimum environment for growth and reproduction. After the quantity of these organisms reaches a suitable size, some part of them are transferred to the farm of a predator, where they are eaten. These farms would, for the most part, be created close to the large population centers. They will be supplied with a static temperature.

B. Sound Absorption Acoustic energy is lost as it is propagated through the sea. Effects of this sort are commonly encountered in liquids because of their vis­ cosity; however, in the case of seawater, the effect is much more pro­ II Oceanic Environment / 55 nounced, giving rise to an absorption coefficient about 25 times as large as that for distilled water. This excess occurs because of the presence of dissolved salts, particularly magnesium sulfate. The equilibrium point for the dissociation of this salt (unlike those for NaCI, N aS 04, and MgCl2) shows strong pressure dependence.

Thus, while this is not a text on underwater acoustics, for example, there will be some discussion of sonar systems to expose the reader to the viewpoint underlying the treat­ ment of the environmental data. Such an approach has both advantages and disadvantages. Particularly it has the possible disadvantage of lead­ ing to omission of information that does not pertain to well-known types of systems. , 1946; Hill, 1962; Maxwell, 1970). One should surely familiarize himself with these references before undertaking any sea-going venture.

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Hydronautics by Herman E. Sheets

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