hourglass head 中文意思是什麼
hourglass head
解釋
葫蘆頭, 沙漏頭-
On the condition of “ many - head ” and “ small drive ratio ” ， the plane double enveloping hourglass worm can not settle the problem of undercutting and sharpening simultaneously. it has devoted to a new type hourglass worm _ sphere double enveloping hourglass worm. the coordinate system is established according to the frock. the meshing equation and the tooth equation of worm and gear have been developed and the distribution of contact line on gear tooth is analyzed. to evaluate the meshing quality ， four meshing quality indexes and five original parameters are put forward. through mass programming computing ， the relations between meshing quality and original parameters are derived and depicted by graphs
考慮到平面二次包絡環面蝸桿傳動在多頭小傳動比條件下根切與齒頂變尖的矛盾很難同時解決且嚙合性能較差，介紹了一種新型環面蝸桿傳動? ?球面二次包絡環面蝸桿傳動.在研究過程中，根據工裝建立了坐標系，根據一二包過程的運動關系推得了嚙合方程和蝸桿與蝸輪的齒面方程，分析了蝸輪齒面上的接觸線分佈.為了評價嚙合性能，提出了4項性能指標和5項原始參數，通過大量編程計算得到了嚙合性能指標與原始參數之間的關系，並以圖表直觀的表示 -
" genes tell the body where the head goes and where the tail goes, what goes on the front and what goes on the back, " explains c. ronald kahn of the harvard medical school and president of the joslin diabetes center in boston. no news there. but without looking at you, kahn can examine a sample of your genes and tell you if you ' re shaped like an hourglass or a pear and whether you have huge hips or a beer belly
據美國生活科學4月11日報道，現在，美國波士頓喬士林糖尿病研究中心的負責人美國哈佛大學醫學院的羅納德卡恩教授不需要看見你，只需要對你的基因樣本進行分析就能準確說出你的體形是沙漏形的還是梨形的而且他還能說出你的臀部是否豐滿或者你是不是有個啤酒肚。
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