A MAJORITY-MINORITY NATION: RACING THE POPULATION IN THE TWENTY-FIRST CENTURY

This article explores the factors that affect the creation of racial classifications and how they are reflected in the Census categories, particularly in regard to the classification of Hispanics. The article argues that an increase in racial minorities will not solely stop white racial domination of political power structures because of entrenched racial policies and practices. To end this domination, racial minorities must organize and collaborate to take down these racially oppressive structures

A MAJORITY-MINORITY NATION: RACING THE POPULATION IN THE TWENTY-FIRST CENTURY

This article explores the factors that affect the creation of racial classifications and how they are reflected in the Census categories, particularly in regard to the classification of Hispanics. The article argues that an increase in racial minorities will not solely stop white racial domination of political power structures because of entrenched racial policies and practices. To end this domination, racial minorities must organize and collaborate to take down these racially oppressive structures

Annoyance due to multiple airplane noise exposure

A laboratory study was conducted to investigate the annoyance effects of multiple aircraft noise exposure in which 250 subjects judged the annoyance of half-hour periods of airplane noise simulative of typical indoor home exposures. The variables of the aircraft noise exposure were the peak noise level of flyovers, which was constant within each period, and the number of flyovers. Each subject judged 5 of the possible 25 factorial combinations of level and number. Other variables investigated included the experience of the test subjects in making annoyance judgments and their home exposure to airplane noise. The annoyance judgments increased with both noise level and number of flyovers. The increased annoyance produced by doubling the number of flyovers was found to be the equivalent of a 4 to 6 db increase in noise level. The sensitivity of the subjects to changes in both noise level and number of flyovers increased with laboratory experience. Although the means of the annoyance judgments made in the laboratory were found to decrease with the subjects' home exposure to aircraft noise, the subjects' sensitivities to changes in both level and number were unaffected by their home exposure

A summation and inhibition model of annoyance response to multiple community noise sources

A model of annoyance due to combined noise sources was developed. The model provides for the summation of the subjective magnitudes of annoyance due to the separate noise sources and for the inhibition of the subjective magnitudes of each source by the presence of the other noise sources. The inhibition process is assumed to mathematically obey a power-group transformation. The results of an experiment in which subjects judged the annoyance of 15 minute sessions of combined aircraft and with several other models of combined source annoyance. These comparisons indicated that the model developed herein provides better qualitative and quantitative agreement with experimental responses than the other models. The application of the model to multiple community noises is discussed

Silicon carbide, a high temperature semiconductor

Electronic applications are described that would benefit from the availability of high temperature semiconductor devices. Potential materials for these devices are compared and the problems of each are discussed. Recent progress in developing silicon carbide as a high temperature semiconductor is described