Based on the differential geometry theory, a mathematical model of milling cutter and a generalized 3-dimension nonlinear model of element cutting force are developed in this paper.

基于微分几何理论建立了任意形状铣刀的数学模型，给出适用于任意形状铣刀的三维单元铣削力模型。

youdao

Milgram's project fits one element of the Arnold model: fund promising research for relatively small amounts millions, if that can be deemed small with the implicit commitment to spend substantially more if the results point to practical solutions.

WSJ: The New Science Behind Philanthropy | WSJ.Money Summer 2013

Mr. DAVID COLE (Center for Automotive Research): It really does represent a fundamental new business model of labor management relations, and I think it recognizes perhaps the most important element of job security is a profitable company over the long term.

NPR: Lower Costs in UAW Contract Seen as Key for GM

And I think if you look at what I think is likely to happen next year, you already have Republicans -- some Republicans who are more aligned with the very conservative element of what's happening in New York saying this is a model for what you'll see throughout the country.

WHITEHOUSE: Press Briefing