The action of bromine on Δ7-ergostene and choletene derivatives
作者:C.F. Hammer、Robert Stevenson
DOI:10.1016/0039-128x(65)90157-1
日期:1965.5
Abstract The major product, obtained in yields up to 50% from the action of bromine on 5-dihydroergosterylacetate (ergosta-7,22-dien-38-yl acetate) is 7,11,22a,23a-tetrabromoergost-8-en-38-yl acetate. It is accompanied by an isomer, 7,8,22a,23a-tetrabromoergost-14-enyl and other Δ 7,22 -ergostadienyl esters in described. Nuclear magnetic resonance chemical shifts of the angular methyl group protons
Budziarek et al., Journal of the Chemical Society, 1952, p. 2892,2898
作者:Budziarek et al.
DOI:——
日期:——
Hudgell et al., Journal of the Chemical Society, 1954, p. 814
作者:Hudgell et al.
DOI:——
日期:——
EHL Film Thickness Limitation Theory Under a Limiting Shear Stress
作者:Yongbin Zhang、Shizhu Wen
DOI:10.1080/10402000208982584
日期:2002.1
It is numerically shown that the elastohydrodynamic lubrication (EHL) film thickness has a limit under an assumed limiting shear stress of the contact-lubricant interface in isothermal Pure rolling line contacts. The prediction of the central film thickness limit is made, and well matches experiments. The present theory shows that, in elastohydrodynamic line contacts, the central film thickness is of molecular scale and part of the contact area is in non-continuum film lubrication when the equivalent cylinder curvature radius is less than the critical one. This critical radius depends on the load and the contact-lubricant interfacial limiting shear stress at low pressures.
Windaus et al., Justus Liebigs Annalen der Chemie, 1931, vol. 488, p. 91,107