A Precious Bequest: Contemporary Research with the WPA-CCC Collections from Moundville, Alabama *

Peer Reviewedhttp://deepblue.lib.umich.edu/bitstream/2027.42/72459/1/j.1749-6632.1981.tb28184.x.pd

Hemorrhages in muscles of broiler chickens: The relationships among blood variables at various rearing temperature regimens.

Contains fulltext : 123040.pdf (publisher's version ) (Open Access)7 p

Buckingham (1907): An appreciation

Nearly a century ago, Edgar Buckingham (1907) published a seminal work on the movement of soil moisture which is part of the foundation of modern soil physics. It also constitutes a pioneering contribution in the study of multi-phase flow in porous media. A physicist, Buckingham took on an earth science issue of importance to society, and produced superb basic science as a byproduct. Buckingham impresses us with his ability to combine experiment and theory, and his capacity to intuitively explain difficult ideas to a wide audience. Science progresses both by gradual accretion of knowledge, and by sudden influx of ideas. Buckingham's contribution belongs in the latter category. After a brief, four-year rendezvous with soil science, he went on to pursue a long and distinguished career in physics with the National Bureau of Standards. This paper is an appreciation of Buckingham's contribution on soil moisture in the context of contemporary developments in diffusion theory, and the rapid growth of science in America at the turn of the twentieth century

The development of an Afrikaans test for sentence recognition thresholds in noise

OBJECTIVE: The development of a valid and reliable Afrikaans test of sentence recognition thresholds in noise. DESIGN: A collection of sentences was developed, rated for naturalness and grammatical complexity, and digitally recorded using a female speaker. Sentences found to have similar psychometric curve slopes, with equivalent intelligibility at three different noise levels, were arranged into 22 phonemically matched lists of ten sentences each. List equivalence was evaluated in normal-hearing listeners in full and reduced bandwidth conditions. Test-retest reliability of the remaining lists was evaluated in a second group of listeners. STUDY SAMPLE: All listeners were native speakers of Afrikaans with normal hearing. For evaluation of list equivalence, ten listeners were used. Twenty other listeners were used to evaluate test-retest reliability. RESULTS: A collection of eighteen phonemically matched lists was produced. Lists were found to be of equivalent difficulty in full and reduced bandwidth conditions, and to have good test-retest reliability in normal-hearing listeners. The average recognition threshold of these lists was -2.73 dB signal-to-noise ratio (standard deviation = 0.64 dB), and within-subject variability was 1.22 dB. CONCLUSIONS: The developed test provides a valid and reliable means of measuring sentence recognition thresholds in noise in Afrikaans.This project was financially supported by the National Research Foundation of South Africa