Dry Machining Aeronautical Aluminum Alloy AA2024-T351: Analysis of Cutting Forces, Chip Segmentation and Built-Up Edge Formation

In this paper, machining aeronautical aluminum alloy AA2024-T351 in dry conditions was investigated.Cutting forces, chip segmentation, and built-up edge formation were analyzed.Machining tests revealed that the chip formation process depends on cutting conditions and tool geometry.So continuous and segmented chips are generated.Under some cutting c

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Selective breeding for a behavioral trait changes digit ratio.

The ratio of the length of the second digit (index finger) divided by the fourth digit (ring finger) tends to be lower in men than in women.This 2D:4D digit ratio is often used as a proxy for prenatal androgen exposure in studies of human health and behavior.For example, Footballs 2D:4D ratio is lower (i.e.more "masculinized") in both men and women

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