三（环氧丙基）异氰尿酸酯的合成研究

本文采用异氰尿酸与环氧氯丙烷在Ｎ－十二烷基－Ｎ，Ｎ－二甲基－苄基溴化铵催化下，制取三（环氧丙基）异氰尿酸酯。     

香石竹花粉生活力的研究

采用离体萌发法和TTC染色法对香石竹多头类型品种粉恋、迷恋、皇族,单头品种兰贵人的花粉生活力进行了测定,同时对花粉生活力测定方法进行了比较研究．结果表明：在0．15％硼酸＋10％蔗糖＋1％琼脂培养基上,花粉萌发率最高;4个品种中,迷恋的花粉萌发率最高,粉恋和皇族其次,兰贵人最低;TTC染色法测定的花粉生活力比萌发法高．     

北京中轴线上的文化遗产价值与教育意义——基于生态文明教育的再思考

北京中轴线蕴含着丰富的中华优秀传统文化的精髓,它融国家政治之轴、民族文化之轴、文化思想之轴、建筑艺术之轴与生态文明之轴等多重价值为一体,是北京历史文化乃至世界文化中一张耀眼的"金名片".研究中轴线文化与生态文明理念的融合,分析了新时代以人民为中心的生态文明思想,更加丰富了北京中轴线文化遗产的生态文化内涵,探索面向未来依托中轴线文化遗产开展生态文明教育的有效路径,促进人与城市、社会的可持续发展,是全体社会成员共同的社会责任与时代担当.     

Generation of Optical Vortex Using a Spiral Phase Plate Fabricated in Quartz by Direct Laser Writing and Inductively Coupled Plasma Etching

A simple, economical and reliable technique is proposed for fabricating a spiral phase plate （SPP） in a quartz substrate to generate optical vortex with a unit topological charge at the wavelengths of 632.8nm. The spiral phase plate is first formed in the photoresist by direct laser writing lithography and then transferred into the quartz substrate by inductively coupled plasma etching. The performance of the fabricated SPP is verified by using beam intensity distribution, which is in agreement with the theoretical calculation result. The interference measurement suggests that we have succeeded to generate optical vortex with a unit topological charge with the fabricated SPP.