Quasticrystals: A new state of matter?

The identification of the occurrence of a material which has a structure that is ordered but not periodic in an electron diffraction work triggered a sensational discovery in 1984. It was found that a rapidly solidified alloy of Al with 10–14% Mn possesses an icosahedral symmetry in combination with long-range order. The discovery of such aperiodic forms has resulted in rewriting the basics of crystallography and has paved the way to search for these materials in Nature and look for specific applications.     

跳水"压水花"技术运动生物力学研究

“压水花”是竞技跳水比赛中的关键技术，在训练中已经探索总结出不少“压水花”技术的训练方法，但在理论研究上，还远落后于实践。应用有关力学原理和流固耦合理论，对人、水碰撞过程进行简化和计算机模拟，并对“水花”形成的机理进行进一步的分析探讨，总结出不同形状固体(运动员入水时的手形)、在不同务件下撞击水面时“水花”形成的规律，根据计算机模拟结果和理论研究的成果，对“压水花”技术进行生物力学研究，提出“平掌撞水，压揉结合”的水花控制理论和方法。经对江苏省跳水队部分运动员中进行实验训练，取得了满意的结果。     

Chemical crystallography: From inception to maturity

The use of single crystal X-ray diffraction to determine the structure of a chemical compound has been historically classified as ‘Chemical Crystallography’. The methodologies, the accuracy in experiments coupled with the modern computer gadgets and advances in technology makes this branch of science an unequivocal provider of accurate and precise measurements of molecular dimensions. Structure determination by powder diffraction, crystal engineering, charge density analysis and studies on molecules in excited states are the recent add-ons.     

Chemical crystallography: from inception to maturity

The use of single crystal X-ray diffraction to determine the structure of a chemical compound has been historically classified as ‘Chemical Crystallography’. The methodologies, the accuracy in experiments coupled with the modern computer gadgets and advances in technology makes this branch of science an unequivocal provider of accurate and precise measurements of molecular dimensions. Structure determination by powder diffraction, crystal engineering, charge density analysis and studies on molecules in excited states are the recent add-ons. T N Guru Row is at the Solid State and Structural Chemistry Unit of the Indian Institute of Science, Bangalore. He is a chemical crystallographer and prominent areas of his research are in polymorphism and drug design, charge density analysis andab initio powder diffraction.     

邓小平发展社会主义的切入点和三个决定性创新(上)

中国社会主义事业之所以取得令世人瞩目的成就，关键在于邓小平理论在发展社会主义上抓准了切入点，实现了三个决定性的创新。这个切入点即是中国初级阶段的社会主义；三个创新是社会主义结构创新、社会主义体制创新、社会主义手段创新。