Nibbling by herbivores can have a greater impact on the width of tree rings than climate, new research has found. The study could help increase the accuracy of the tree ring record as a way of ...

A severe drought in northern Arizona caused widespread pinyon (Pinus edulis) mortality, exceeding 40% in some populations. We measured tree-ring widths of pinyons that survived and that died in three ...

The folks at TRW have come up with a revolutionary idea for reducing the piston ring drag of the top compression ring. It is called the Pressure Balance Ring (PBR). Essentially, the PBR design amounts ...

Split rings formed and cut from spring wire of uniform cross-sectional size and shape are known as wire-formed rings. Rings are available in many cross-sectional shapes, but the most common have ...