Computer methods for the reduction, correlation and analysis of space battery test data, phase 2, part 1 Final report, 1 Nov. - 31 Dec. 1967

Computer methods for reduction, correlation, and analysis of space battery test dat

Application of cryptanalytic techniques to the analysis of NiCd space batteries

By using Bi-gram and Tri-gram tables, a pattern can be formed to determine failure modes and mechanisms. Computer programs provide accurate predictions of cell failure several thousand cycles before actual failure

Fine sediment reduces vertical migrations of Gammarus pulex (Crustacea: Amphipoda) in response to surface water loss

Surface and subsurface sediments in river ecosystems are recognized as refuges that may promote invertebrate survival during disturbances such as floods and streambed drying. Refuge use is spatiotemporally variable, with environmental factors including substrate composition, in particular the proportion of fine sediment (FS), affecting the ability of organisms to move through interstitial spaces. We conducted a laboratory experiment to examine the effects of FS on the movement of Gammarus pulex Linnaeus (Crustacea: Amphipoda) into subsurface sediments in response to surface water loss. We hypothesized that increasing volumes of FS would impede and ultimately prevent individuals from migrating into the sediments. To test this hypothesis, the proportion of FS (1–2 mm diameter) present within an open gravel matrix (4–16 mm diameter) was varied from 10 to 20% by volume in 2.5% increments. Under control conditions (0% FS), 93% of individuals moved into subsurface sediments as the water level was reduced. The proportion of individuals moving into the subsurface decreased to 74% at 10% FS, and at 20% FS no individuals entered the sediments, supporting our hypothesis. These results demonstrate the importance of reducing FS inputs into river ecosystems and restoring FS-clogged riverbeds, to promote refuge use during increasingly common instream disturbances

Oral history interview with J. Presper Eckert, Kathleen Mauchly, William Cleaver, and James McNulty

Transcript not available electronically. Please contact CBI.The interviewees describe their experiences at the University of Pennsylvania's Moore School of Electrical Engineering in the 1940s. Eckert outlines disputes he and John Mauchly had with the University administration over the assignment of patent rights to the ENIAC, and disputes over other issues with John G. Brainerd, the first director of the ENIAC project. Eckert and McNulty share their views on John von Neumann's influence on the ENIAC and EDVAC projects. The group discusses the Honeywell vs. Sperry Rand litigation and the judgement against Eckert and Mauchly's patent claim to the electronic digital computer. They uniformly dispute the court's finding in favor of John V. Atanasoff's contribution. Other topics include: the use of the ENIAC in atomic bomb tests, and the programming and memory systems of the ENIAC, EDVAC, and UNIVAC