An AES method has been proposed for micro elements analysis in Chinese herbal medicine and the pretreatments of samples are discussed in detail.The method is proved accurate by analyzing peach leaves with the level of...An AES method has been proposed for micro elements analysis in Chinese herbal medicine and the pretreatments of samples are discussed in detail.The method is proved accurate by analyzing peach leaves with the level of the national standard substance and by comparing results using different methods∶ Thedata obtained are accurate and reliable and the method can be used for detemin10 kinds of micro elements in Chinese herbal medicine.展开更多
A series of benzofurocoumarin derivatives have been synthesized. Three of them and a simple coumarin have beendatermined for their Ca2+ atagonizing activity. Preliminary results show that all of them possesses potent ...A series of benzofurocoumarin derivatives have been synthesized. Three of them and a simple coumarin have beendatermined for their Ca2+ atagonizing activity. Preliminary results show that all of them possesses potent activity.展开更多
文摘An AES method has been proposed for micro elements analysis in Chinese herbal medicine and the pretreatments of samples are discussed in detail.The method is proved accurate by analyzing peach leaves with the level of the national standard substance and by comparing results using different methods∶ Thedata obtained are accurate and reliable and the method can be used for detemin10 kinds of micro elements in Chinese herbal medicine.
文摘本文介绍的动态离子束混合技术制备氧化铬薄膜系在不锈钢基体上进行1keV氩离子束溅射沉积铬(同时通入一定量的O),并用100keV的氩离子束或氧离子束轰击该样品。对两种离子束轰击形成的氧化铬薄膜进行了X射线光电子能谱(X-ray photoelectron spectroscopy,XPS)和俄歇电子能谱(Auger electron spectroscopy,AES)的分析研究。发现Ar+离子束制备的氧化铬薄膜主要是Cr2O3化合物,而O+离子束制备的氧化铬薄膜含有其它价态的铬氧化物。Ar+离子束制备氧化铬薄膜的污染碳少于O+离子束制备。与O+离子束制备相比较,相同能量的Ar+离子束轰击更有利于提高沉积的Cr原子与周围O2的反应性;Ar+离子束制备的氧化铬薄膜过渡层的厚1/3左右,较厚的过渡层显示了制备的薄膜具有较好的附着力。
文摘A series of benzofurocoumarin derivatives have been synthesized. Three of them and a simple coumarin have beendatermined for their Ca2+ atagonizing activity. Preliminary results show that all of them possesses potent activity.