Directional synthesis of furfural compounds from holocellulose catalyzed by sulfamic acid

Cellulose - The coproduction of 5-hydroxymethylfurfural (5-HMF) and furfural (FUR) via the direct hydrolysis of holocellulose analogue composed of cellulose and hemicellulose was investigated. The...     

基于柱[n]芳烃(准)轮烷的研究进展

柱芳烃作为一类新型的大环主体分子,自2008年首次报道以来,引起了人们,特别是化学家的广泛关注.目前,它已在分子识别、(准)轮烷、超分子聚合物、分子弹簧、智能跨膜离子通道、囊泡、金属有机骨架结构等众多研究领域作为重要模块得到初步的应用.主要将以柱芳烃作为主体大环分子来构筑(准)轮烷的研究进展进行简要的综述,同时还介绍了基于柱芳烃的(准)聚轮烷的研究概况,并对未来的发展作了进一步展望.     

Synthesis of a water-soluble pillar[6]arene dodecaamine and its selective binding of acidic amino acids in water

A water-soluble pillar[6]arene dodecaamine has been synthesized. ¹H NMR and fluorescence studies indicate that pillar[6]arene dodecaamine could selectively and strongly bind acidic amino acids, i.e. glutamic acid and aspartic acid in water. And the complexation behavior of pillar[6]arene dodecaamine towards acidic tripeptide glutathione and short chain length (C₃ to C₈) dicarboxylic acids in water is also investigated.     

Novel [2]pseudorotaxanes constructed by self-assembly of bis-urea-functionalized pillar[5]arene and linear alkyl dicarboxylates

A bis-urea-functionalized pillar[5]arene has been synthesized and shown to form [2]pseudorotaxanes spontaneously with linear alkyl dicarboxylates in highly polar solvent DMSO, in which the hydrogen bonding interactions between the bis-urea hydrogens and dicarboxylate oxygens play an important role in stabilizing the novel [2]pseudorotaxanes alongside C-Hπ interactions.     

随机疲劳裂纹扩展新模型

疲劳裂纹扩展的随机特性是工程结构可靠性分析和制定检查、维修计划野性 须考虑的因素,提出疲劳裂纹随机扩展模型,不仅考虑了时间参数影响,而且还考虑了初始裂纹尺寸分布影响。模型适应范围广,由于采用了一次二阶矩近似方法简化随机过程计算,便于工程应用。     

疲劳安全与寿命可靠性评估二次三阶矩方法

提出了疲劳安全与寿命可靠性评估的二次三阶矩方法，并且给出了常用随机变量的三阶矩计算方法，由于采用三参数威尔布分布拟合，可以较好地描述各种分布形态的随机变量，与传统的一次二阶矩方法比较，该文提出的方法计算精度高，适应性强。