Investigation of external refrigeration systems for long term cryogenic storage Final report

Data on external refrigeration systems for space storage of cryogens for long period

Quantification of the Business Benefits of Positive Train Control

The purpose of this analysis is to quantify the \u201cbusiness benefits\u201d of Positive Train Control (PTC for the Class I freight railroad industry1. Positive Train Control is a concept, rather than a single technology or system. It can include many different capabilities, covering a range of railroad functions. The three components of PTC are the on-board computer (OBC) with Differential Global Positioning System (DGPS) location capability, a dedicated wireless digital data link between locomotives and a control center, and the central office hardware and software at the control center

Energy: A continuing bibliography with indexes, supplement 16, January 1978

This bibliography lists 1287 reports, articles, and other documents introduced into the NASA scientific and technical information system from October 1, 1977 through December 31, 1977