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近日,由我国近当代杰出的爱国宗教领袖和社会活动家赵朴初先生夫人陈邦织先生作序、当代著名书法家张荣庆先生题跋、上海书画出版社出版的《张宇书赵朴初碑记》一书,与广大读者见面了。这是张宇先生继《张宇楷书千字文》《张宇书法作品集》等7部专著之后的又一书法力作。 相似文献
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The amino acid Schiff base complex (Sal-AMBA-Mn) was prepared with p-amino-methylbenzoic acid, salicylaldehyde and Mn(OAc)2·4H2O. Its structures was characterized with IR and UV spectra. Oxygenation mechanism of the complex in N, N-dimethylformamide solution was investigated. The results show that lower temperature is in favor of the oxygenation, and energy, enthalpy and entropy are -3.8 kJ/mol, -4.2 J/mol and -161.44 J/(mol·K), respectively. In the presence of the manganese complex, dehydroepiandrosterone acetate is effectively oxidized by molecular oxygen and the corresponding enone 7-ketodehydroepiandrosterone acetate is obtained. The yield is 62.1% when the oxidation is carried out under the reaction conditions of 60 ℃, 2 MPa of O2 pressure, C5H5N as a solvent and molar ratio of the substrate to the complex of 1:10. 相似文献
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安徽八一纺织器材厂坐落在美丽的国家森林公园、国家风景名胜区天柱山麓。创建于1981年3月,从加工纺织用刷、络纱纸管等手工产品起步,逐渐滚动发展,不断积累壮大,从过去的粗加工产品发展到现在的高新技术产品,实现了质的飞跃,发展成为国内较大的纺织橡胶产品专业生产企业。主导产品有“潜阳”牌BYC系列棉纺牵伸用丁腈胶辊胶圈、罗拉轴承、并条芯轴等,以免处理胶管、微处理胶管、铝衬套胶管、高速并条胶管、花纹胶圈、纯化纤纺胶圈、高速导丝胶圈等高新技术产品为代表的优质产品群现已形成。各项经济指标逐年稳步上升,自1991年以来连续盈利… 相似文献