The parameter ∆ε (in M -1 cm -1 ) appearing in this article, including figures, to report the CD intensity should be corrected to [θ] Because the experiments were actually carried out at 300 K, the correct value of the viscosity of D 2 O is 1.0465 mPa · s.1 After correction for the presence of salts using the Jones-Dole equation, 2 the final viscosity of the D 2 O solution used to carry out the PFGSE NMR experiments was 1.0586 mPa · s. Because the viscosity is used to convert the diffusion coefficient of the dendrimers, measured by the NMR experiment, into a hydrodynamic radius (R h ) via the Stokes-Einstein equation, this error led to an incorrectly stated value of R h . The incorrect value of R h given in the paper for G4-OH and G4-OH(Pd 55 ) is 1.7 ( 0.2 nm for both species. The actual value of R h for both G4-OH and G4-OH(Pd 55 ), calculated using the proper solution viscosity and temperature, is 2.0 ( 0.2 nm. This latter value agrees very well with previous R h values determined by PFGSE NMR experiments for G4-NH 2 and G4-OH (2.08 ( 0.13 nm 3 and ∼1.85 nm, 4 respectively).The errors discussed herein do not significantly change any of the conclusions or claims made in the original paper.We sincerely regret this error, and we thank Prof. Neer Asherie (Yeshiva University) for pointing it out.
Literature Cited(1) http://webbook.nist.gov/.(2) Jones, G.; Dole, M.
− Automotive wheel bearing grease helps to reduce stresses and prevent wear of wheel bearings. But it is easily contaminated by water and other contaminants. In this study, we investigated the property change of automotive wheel bearing grease under water contamination. The result showed that some properties such as dropping point, work penetration and oxidation stability were not influenced by water content. However, most of properties such as work stability, water washout characteristics, leakage tendency, oil separation, evaporation loss and rust protection became worse after water was added. This is thought that added water makes the interaction weak between thickener and base oil of grease.
Automatic transmission fluid (ATF) is used for automatic transmissions in the vehicle as the characterized fluid. Recently, the vehicle manufacture usually guarantee for fluid change over 80000~100000 km mileage or no exchange, but most drivers usually change ATF below every 50000 km driving in Republic of Korea. It can cause to raise environmental contamination by used ATF and increase the cost of driving by frequently ATF change.In this study, we investigate the various physical properties such as flash point, fire point, pour point, kinematic viscosity, cold cranking simulator, total acid number, and metal component concentration for fresh and used ATF after driving (50000 km, 100000 km). The result showed that the total acid number, pour point, Fe, Al and Cu component had increased than fresh ATF, but 2 kind of used oil (50000 km and 100000km) had similar physical values and metal component concentration
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