Interim prediction method for low frequency core engine noise

A literature survey on low-frequency core engine noise is presented. Possible sources of low frequency internally generated noise in core engines are discussed with emphasis on combustion and component scrubbing noise. An interim method is recommended for predicting low frequency core engine noise that is dominant when jet velocities are low. Suggestions are made for future research on low frequency core engine noise that will aid in improving the prediction method and help define possible additional internal noise sources

Farm water systems

"February, 1940""An adequate supply of pure water is essential for good health of the farm family, and when piped under pressure to the home and other parts of the farmstead, where needed, it is a most valuable asset. Water available under pressure in the home will probably save more time and energy than any other one improvement requiring a similar investment. Considerable valuable time and labor can likewise be saved by having water piped to livestock watering troughs in the barns, feed lots, or pastures. Furthermore, pure, fresh water available to livestock and poultry whenever it is wanted promotes better growth and production."--First page

Subsurface structure and petroleum drilling in the Vincennes Quadrangle : Lawrence County, Illinios, and Knox Country Indiana

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Introduction to the Anti-Racism Virtual Issue of the Journal of Occupational Science

The anti-racism virtual issue of the Journal of Occupational Science (JOS) came about after the Editorial Board expressed its commitment to anti-racist work, publishing the position statement ‘A Pledge to Mobilize Against Racism’ (Stanley et al., 2020). In this statement, the Board promised to republish a collection of articles to call attention to racism and its impact on individuals’ doing and society. The intent is to stimulate critical reflection on the contribution occupational scientists can make to exposing and countering racism in everyday doing. As such, the anti-racism virtual issue helps meet a pressing need to recognize the power of occupation in shaping and reproducing social ideologies, attitudes, and behaviors. We, the authors, urge all occupational scientists to build on this knowledge and continue learning about racism to better understand and address how its different dimensions manifest through occupation and everyday life