There exists evident macroscopic statistical unsymmetry texture in every layer of 70-30 brass rolled by single directional cross shear rolling. There has been a consistent interest in how to measure and calculate this...There exists evident macroscopic statistical unsymmetry texture in every layer of 70-30 brass rolled by single directional cross shear rolling. There has been a consistent interest in how to measure and calculate this kind of unsymmetric global texture. Utilizing the previous composite sample methods, people can only describe a展开更多
70-30 brass is rolled with 90% reduction by cross shear rolling in single direction with speed ra- tio 1.39.The sheet is divided into five layers along rolling plane normal to measure macroscopic statis- tical unsymme...70-30 brass is rolled with 90% reduction by cross shear rolling in single direction with speed ra- tio 1.39.The sheet is divided into five layers along rolling plane normal to measure macroscopic statis- tical unsymmetric textures in every layer are des- cribed and analysed by means of three dimensional orientation distribution function.The results indi- cate that the main textures in every layer of brass rolled by cross shear rolling in single direction are the same as the main textures of brass rolled by conventional rolling.But the intensities,peak posi- tions and scatters of every texture component in {110}<112>are different,namely,there is a macroscopic statistical unsymmetry.It is found that the textures in every layer of brass rolled by cross shear rolling in single direction can be considered as the textures of brass rolled by common rolling in single direction at identical shear forces,the macroscopic statistical unsymmetry depends on the shear forces which are exerted on the layer.展开更多
A facile and highly efficient method has been developed for the synthesis of unsymmetrical N-aryl-2,2-di（1H-indol-3-yl）acetamide derivatives by regioselective Friedel-Crafts alkylation of the N-aryl-2-hydroxy-2-（1H...A facile and highly efficient method has been developed for the synthesis of unsymmetrical N-aryl-2,2-di（1H-indol-3-yl）acetamide derivatives by regioselective Friedel-Crafts alkylation of the N-aryl-2-hydroxy-2-（1H-indol-3-yl） acetamide derivatives with various indoles catalyzed by 2 mol/L H2SO4 at room temperature in ashort reaction time, the yield was up to 94%.展开更多
1 Results The dominant position of molecular oxygen as the oxidant for bulk chemical oxyfunctionalizations is due to the fact that it is the only economically and environmentally friendly feasible oxidant for large sc...1 Results The dominant position of molecular oxygen as the oxidant for bulk chemical oxyfunctionalizations is due to the fact that it is the only economically and environmentally friendly feasible oxidant for large scale processing.But molecular oxygen is not better oxidant than others,such as PhIO,NaOCl,H2O2,alkyl hydroperoxides,percarboxylic acids,magnesium monoperoxyphthalate.So we have to select high reactivity and general utility catalyst.The oxidation of hydrocarbons catalyzed by transition metal ...展开更多
基金Project supported by the National Natural Science Foundation of China
文摘There exists evident macroscopic statistical unsymmetry texture in every layer of 70-30 brass rolled by single directional cross shear rolling. There has been a consistent interest in how to measure and calculate this kind of unsymmetric global texture. Utilizing the previous composite sample methods, people can only describe a
文摘70-30 brass is rolled with 90% reduction by cross shear rolling in single direction with speed ra- tio 1.39.The sheet is divided into five layers along rolling plane normal to measure macroscopic statis- tical unsymmetric textures in every layer are des- cribed and analysed by means of three dimensional orientation distribution function.The results indi- cate that the main textures in every layer of brass rolled by cross shear rolling in single direction are the same as the main textures of brass rolled by conventional rolling.But the intensities,peak posi- tions and scatters of every texture component in {110}<112>are different,namely,there is a macroscopic statistical unsymmetry.It is found that the textures in every layer of brass rolled by cross shear rolling in single direction can be considered as the textures of brass rolled by common rolling in single direction at identical shear forces,the macroscopic statistical unsymmetry depends on the shear forces which are exerted on the layer.
文摘A facile and highly efficient method has been developed for the synthesis of unsymmetrical N-aryl-2,2-di（1H-indol-3-yl）acetamide derivatives by regioselective Friedel-Crafts alkylation of the N-aryl-2-hydroxy-2-（1H-indol-3-yl） acetamide derivatives with various indoles catalyzed by 2 mol/L H2SO4 at room temperature in ashort reaction time, the yield was up to 94%.
文摘1 Results The dominant position of molecular oxygen as the oxidant for bulk chemical oxyfunctionalizations is due to the fact that it is the only economically and environmentally friendly feasible oxidant for large scale processing.But molecular oxygen is not better oxidant than others,such as PhIO,NaOCl,H2O2,alkyl hydroperoxides,percarboxylic acids,magnesium monoperoxyphthalate.So we have to select high reactivity and general utility catalyst.The oxidation of hydrocarbons catalyzed by transition metal ...
