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Guiding of 150 keV O^(6+) ions through nanocapillaries in an uncoated Al_2O_3 membrane:special time dependence of the transmission profile width 被引量:1
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作者 陈熙萌 席发元 +14 位作者 邱玺玉 邵剑雄 肖国青 崔莹 孙光智 王俊 陈益峰 刘会平 尹永智 王瑜玉 李德慧 娄凤君 王兴安 徐俊奎 周春林 《Chinese Physics B》 SCIE EI CAS CSCD 2009年第5期1955-1960,共6页
This paper reports that the transmission of O6+ ions with energy of 150keV through capillaries in an uncoated Al2O3 membrane was measured, and agreements with previously reported results in general angular distributi... This paper reports that the transmission of O6+ ions with energy of 150keV through capillaries in an uncoated Al2O3 membrane was measured, and agreements with previously reported results in general angular distribution of the transmitted ions and the transmission fractions as a function of the tilt angle well fitted to Gaussian-like functions were observed. Due tousing an uncoated capillary membrane, our φc is larger than that using a gold-coated one with a smaller value of Ep/q, which suggests a larger equilibrium charge Q∞ in our experiment. The observed special width variation with time and a larger width than that using a smaller Ep/q were qualitatively explained by using mean-field classical transport theory based on a classical-trajectory Monte Carlo simulation. 展开更多
关键词 guiding effect Al2O3 nanocapillaries uncoated membrane transmission profile width
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DESIGN OF NONCIRCULAR GEARS WITH DISCONTINUOUS PITCH CURVE 被引量:5
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作者 ZHANG Rui WU Xutang 《Chinese Journal of Mechanical Engineering》 SCIE EI CAS CSCD 2006年第4期594-599,共6页
When the noncircular gear pair is applied to the continuously variable transmission (CVT) with gear, the transmission ratio function is discontinuous. In accordance with this unique characteristic, a new approach to... When the noncircular gear pair is applied to the continuously variable transmission (CVT) with gear, the transmission ratio function is discontinuous. In accordance with this unique characteristic, a new approach to design and analyze noncircular gears with discontinuous pitch curve is proposed. The design courses of various noncircular gear pairs with discontinuous pitch curve are unified based on the numerical algorithm of spline fitting and "fairing boundary condition". According to the particularity of discontinuous pitch curve, the rules and procedures for teeth distribution are recommended. It is explained in detail why the undercut is formed and how to manage the undercut based on meshing principle.In addition, the calculation formulas for each tooth profile segment are also derived. If the tooth profile data are calculated, the measurement and the incision process for noncircular gear can be conducted and the CAD simulation can be achieved easily. To ensure the continuity of the transmission, the transmission interference of the tooth which is located at the pitch curve joint point is managed by utilizing Bezier curve with CAD software. And the contact ratio of gear pair is obtained. The case study shows that this approach is successful and opens up a new way for the design of noncircular gear. 展开更多
关键词 Noncircular gears Continuously variable transmission(CVT) Tooth profile
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