排序方式: 共有33条查询结果,搜索用时 0 毫秒
31.
The design of various components of Liquid Metal Cooled Fast Breeder Reactors (LMFBR) requires knowledge of the natural convection heat transfer conditions. A review has therefore been made of natural convection heat transfer for low Prandtl number fluids: this includes both theoretical and experimental studies. The importance of the surface orientation is emphasized with reference to vertical, inclined, and horizontal surfaces.The most recent measurements made by the authors are compared with the analytical predictions and measurements made in other low Prandtl number fluids. 相似文献
32.
Hydrogen peroxide (H(2)O(2)) generated from the manganese(II) catalysed reduction of dioxygen has been shown to efficiently oxidize Calmagite (3-hydroxy-4-(2-hydroxy-5-methylphenylazo)naphthalene-1-sulfonic acid) in aqueous solution at pH 8.0 and 20 +/- 1 degrees C with de-protonated Tiron (1,2-dihydroxybenzene-3,5-disulfonate, disodium salt) acting as an essential co-ligand. 相似文献
33.
Maniklal Shee Sk. Sheriff Shah Prof. N. D. Pradeep Singh 《Chemistry (Weinheim an der Bergstrasse, Germany)》2020,26(62):14070-14074
This report presents the visible-light-assisted synthesis of aryl nitriles from easily accessible alcohols or methyl arenes in the presence of O2. Organic photoredox catalyst, 4CzIPN (1,2,3,5-tetrakis(carbazol-9-yl)-4,6-dicyanobenzene), induces single electron transfer (SET) from azide N3− and generates azide radical N3⋅.The photogenerated N3⋅ abstracts H atom from α-C−H bond of benzylic system, which provides aldehyde and hydrazoic acid (HN3) in situ. This reaction subsequently forms azido alcohol intermediate that transforms into nitrile with the assistance of triflic acid (Brønsted acid). A range of alcohols and methyl arenes successfully underwent cyanation at room temperature with good to excellent yields and showed good functional group tolerance. 相似文献