Considering the features of multi-edges and helix flutes for end milling, a cutting force discrete model base on single point cutting tools model was built.

根据单点切削力模型，考虑平头立铣刀多刃和具有螺旋角的特点，建立了铣削力离散模型。

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This article introduces a means of nc program about rough cut of helicoid base on helix-milling. The means can improve efficiency of cutting, reduce the cutting abrasion, depress the operating costs.

基于螺旋线数控铣削的螺旋曲面粗加工的方法可大大提高加工效率，减少刀具磨损，降低加工成本。

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If I'm talking about two DNA strands and they differ only in one or two base pairs they won't be exact complements and they won't form this double helix.

假设有两条DNA单链,有一两个碱基不能配对,它们就不能完全互补,也无法形成双螺旋形结构

耶鲁公开课 - 生物医学工程探索课程节选

Now DNA is a double helix and I've only shown you one part of the helix, right? I've shown you one upright strut and a base hanging off of it, but it forms a double helix because complementary strands of DNA strongly associate with one another and that's a very stable structure.

NA是双螺旋,我只是给你们讲了螺旋的一边,我给你们演示,一条链的支柱及碱基团,但其能构成双螺旋,是因为DNA是完全互补的两条链,彼此之间结合紧密,结构异常稳定

耶鲁公开课 - 生物医学工程探索课程节选

Scattered throughout this double helix of base pairs are thousands of tiny DNA "words, " genes that provide the recipe for making a given protein, the raw material for the human body.

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The 2010 National Medal Science to Jacqueline K. Barton, California Institute of Technology, for discovery of a new property of the DNA helix long-range electron transfer, and for showing that electron transfer depends upon stacking of the base pairs and DNA dynamics.

WHITEHOUSE: President Obama Honors the Country��s Top Innovators and Scientists | The White House