Aquaculture: a solution, or source of new problems?

Article Abstract:

Aquaculture, the selective breeding and raising of fish in fish farms has several side effects such as significant unemployment among fishermen engaged in traditional fishing, pollution and spread of disease. Despite these problems, aquaculture contributes a 3 million-ton increase in world fish consumption between 1990 and 1993. Farm owners tried to prevent diseases problem by closing down their operations after four or five years and moving to a new place.

Environmental aspects, Aquaculture

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A compact radiological X-ray source

Article Abstract:

A compact electron cyclotron resonance magnetic mirror discharge produces medical X-rays with energy up to 100-keV. The production of X-rays coincides with the heating of the tantalum target showing that electron acceleration is possible only at low pressure, and is inhibited by occurrence of collisions. The X-ray emission occurs from the chamber metal walls, adjacent to the magnets.

X-rays, Radiology, Medical, Radiology

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Role of spectral detail in sound-source localization

Article Abstract:

Acoustic research demonstrates that human beings detect no difference in sound location when head-related transfer functions (HRTFs), heard through open-canal tube phones, are substantially modified. Virtual sound sources are indistinguishable from real ones after smoothing HRTF parameters have been applied. Minimum-phase responses were applied to HRTFs.

Acoustical engineering, Sound laboratories

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