Review of the legal and regulatory history of lead in hunting

Abstract In the United States, regulations to restrict the use of lead in ammunition have evolved at both the federal and state levels since lead shot was banned for hunting waterfowl nationwide by federal regulation in 1991.Prior to 1991, most of the effort and discussions were focused on reducing Needles lead ingestion by wildlife from, and findi

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Applicability of Convex and Concave Shaped Surface Texturing to Improve Damping Performance of Mechanical Tensioner for Timing Chain of Internal Combustion Engine

The present study describes an improvement of damping performance of a mechanical tensioner driven by friction force at the power spring interface, used for the timing chain system for an internal combustion engine.The mechanical tensioner consists of a power spring subjected to face-to-face contact with a reciprocal motion and a leaf spring to app

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A Relational Ecology of Photographic Practices

This paper proposes a relational history of media artifacts, Engine Plates which decentralizes the dominance of the photographer or filmmaker as the absolute author of the work.It adds an alternative account to understanding the creative process and the subsequent study of media forms by discussing film and photographic practices as the reciprocal

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