Such versatile adult dental stem cells would certainly speed efforts to generate teeth on scaffolds , and they might also facilitate the tooth - engineering approach used by the sharpe group at king ' s college london 這些多功能的成年牙齒干細(xì)胞,勢(shì)必可加速利用支架來(lái)制造牙齒的工作,而且也可能促成了英國(guó)倫敦國(guó)王學(xué)院夏普?qǐng)F(tuán)隊(duì)所進(jìn)行的牙齒工程研究。
5 ) using the practical products , we have done experiments and comparisons on designing and generating tooth , testing the contact ratio , tooth root stress , vibration and noise for the high contact ratio spiral bevel gears 摘要5 )采用實(shí)驗(yàn)研究技術(shù),結(jié)合實(shí)際產(chǎn)品,進(jìn)行了高重合度弧齒錐齒輪的設(shè)計(jì)、切齒、重合度測(cè)試、齒根應(yīng)力測(cè)量、振動(dòng)和噪聲測(cè)量等大量對(duì)比實(shí)驗(yàn)。
Abstract : in order to solve the double parameters enveloped in the geartooth flank generating , the complicated double parameter envelope is simplified to the generating process between work - piece and imaginary crown generating gear by means of mathematical transformation . the equation of the imaginary crown generating surface and the partial derivatives are deduced , so the differential geometric parameters of the generating surface can be obtained . by analyzing the generating motion between the imaginary crown generating gear and the work - piece , all the first to third order geometric parameters of the generated tooth flank at any given point can be calculated 文摘:為了解決直接求解展成法加工中存在的復(fù)雜雙參數(shù)包絡(luò)問(wèn)題時(shí)的困難,提出通過(guò)數(shù)學(xué)變換,將此包絡(luò)問(wèn)題轉(zhuǎn)化為假想平面產(chǎn)形輪與工件之間的展成問(wèn)題來(lái)進(jìn)行研究.推導(dǎo)了假想產(chǎn)形面的方程和各階偏導(dǎo)矢,于是可獲得產(chǎn)形面的微分幾何參數(shù).通過(guò)分析假想平面產(chǎn)形輪與工件之間的展成運(yùn)動(dòng),即可得到被展成齒面上任意指定點(diǎn)的全部一至三階微分幾何參數(shù)