Scattering layers and vertical distribution of oceanic animals off Oregon

This paper reviews some of the distributional features of vertically migrating micronekton off Oregon; describes a new, conducting-cable, midwater-trawl system using an eight-net, opening-closing cod-end unit; and gives some preliminary results on trawl catches relative to sound-scattering layers. A variable complex of organisms, including euphausiids, a sergestid shrimp, and mesopelagic fishes, was often common in 12- and 38.5-kHz scattering layers. The depth range of many species was broad, and sometimes the largest catches were made at depths above or below scattering layers. Variability was large among nets that fished either horizontally or vertically during single tows

The Galaxy Computer control system

The logic control system of a computer automatically sequences logic operations which direct how and when memory stored instructions and data are processed in the digital registers. This thesis contains circuit schematics and test results of a nanosecond response logic - control system for the Galaxy Computer. The circuit designs have made possible level -logic operation rates over a million per second. The use of a voltage level -shift scheme with low capacitance and complementary emitter -follower current -amplifier accounts for most of the speed improvement. The circuits are designed to be race -free and maintain the same rise and fall time whether operating at low or high frequency. Ability to switch large signal currents improves the fan -out capabilities of the logic networks, thereby increasing the number of functions that can be performed on a particular logic step. Interlocking control in a single logic - control system allows several systems to be coupled together for concurrent operation. A scheme like the logic - control system can also be used wherever there is a need for a fast, versatile preprogrammed electronic switch