Low-friction, high-stiffness ball guides support on one rail (top) or two (bottom). The trade-offs for this performance are higher cost and more noise. The shortest path between two points is a ...
Scientists from Stellenbosch University in South Africa have designed a new gravity energy storage system, based on linear electric machines (LEM), that could be used in decommissioned mines. “The ...
The Review of Economics and Statistics is an 84-year old general journal of applied (especially quantitative) economics. Edited at Harvard University's Kennedy School of Government, The Review has ...
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