The National Bureau Of Standards Research Program For The Archival Lifetime Analysis Of Optical Digital Data Disks (0D 3 )

1984 ◽  
Author(s):  
Sidney B. Geller
Keyword(s):  
Research Program ◽  
Digital Data ◽  
National Bureau ◽  
Lifetime Analysis

Digital Recording of Mass Spectra in Geologic Studies. II

1972 ◽  
Vol 9 (7) ◽  
pp. 824-834 ◽  
Author(s):  
J. S. Stacey ◽  
E. E. Wilson ◽  
R. Terrazas
Keyword(s):  
Digital Data ◽  
National Bureau ◽  
Mass Spectrometers ◽  
Mass Unit ◽  
Programming Techniques ◽  
Recorded Data ◽  
System Bias ◽  
Vibrating Reed ◽  
Feedback Resistor ◽  
Data Calibration

The digital system described herein can record data from several mass spectrometers on a single magnetic tape. Programs have been written for isotopic abundance calculations of lead, thorium, uranium, strontium, and argon analyses. The programming techniques successfully recognize and reject spurious data. Both chart and digitally recorded data are presented for seven analyses of the U.S. National Bureau of Standards common lead standard SRM 981. Standard deviations of the ratios of the digital data range from 0.018% for the 207Pb/206Pb to 0.038% for the 208Pb/204Pb. The equivalent hand-processed values are 0.044 and 0.066%, respectively. The measured ratios are offset from their absolute values almost entirely by a fractionation component of about 0.16% per mass unit. Other bias introduced by the system is shown to be very small and probably not greater than 0.01% for the digital data and 0.05% for chart-read data. Calibration of the vibrating reed electrometer amplifier with current flowing through the feedback resistor has considerably improved the analytical precision and reduced the system bias.

Tinkering with cognitive gadgets: Cultural evolutionary psychology meets active inference

2019 ◽  
Vol 42 ◽  
Author(s):  
Paul Benjamin Badcock ◽  
Axel Constant ◽  
Maxwell James Désormeau Ramstead
Keyword(s):  
Evolutionary Psychology ◽  
Research Program ◽  
Active Inference ◽  
Innovative Research ◽  
Cognitive Faculties ◽  
Cultural Evolutionary ◽  
The Relationship

Abstract Cognitive Gadgets offers a new, convincing perspective on the origins of our distinctive cognitive faculties, coupled with a clear, innovative research program. Although we broadly endorse Heyes’ ideas, we raise some concerns about her characterisation of evolutionary psychology and the relationship between biology and culture, before discussing the potential fruits of examining cognitive gadgets through the lens of active inference.

Sign in / Sign up

Export Citation Format

Share Document