当玻璃外壳搭配金属机械机芯,用手工艺与艺术把坚固的金属与澄澈的水晶玻璃融为一体,化无形为有形,连接着人、环境与永恒的时间。积家的Atmos空气钟构造在1928年就已经震惊世界。这个无需任何外力的钟,根据巧妙的设计,能把气温转成动力...当玻璃外壳搭配金属机械机芯,用手工艺与艺术把坚固的金属与澄澈的水晶玻璃融为一体,化无形为有形,连接着人、环境与永恒的时间。积家的Atmos空气钟构造在1928年就已经震惊世界。这个无需任何外力的钟,根据巧妙的设计,能把气温转成动力。其奥秘在于一个充满混合气体的密封罩,气体根据温度的细微变化膨胀或收缩,不断为座钟上链,一摄氏度的温差可以产生支持48小时运转的动力。爱马仕委托Les Cristalleries de Saint-Louis制造空气钟超凡的水晶玻璃罩。展开更多
我和钟超都是从中文系毕业分配到 C 市的,我进了市人大办公室秘书科当一名摆弄文字的科员,而钟超到了一间国营大企业——印刷集团公司当办公室主任。开始我和钟超谈起各自的生活待遇,都觉得很不公平。钟超是出入有小车,月薪三四千,老板...我和钟超都是从中文系毕业分配到 C 市的,我进了市人大办公室秘书科当一名摆弄文字的科员,而钟超到了一间国营大企业——印刷集团公司当办公室主任。开始我和钟超谈起各自的生活待遇,都觉得很不公平。钟超是出入有小车,月薪三四千,老板看得起,请吃有签单权。而我呢,出入自行车,月薪仅两千,整天爬格子,哪有签单权!因此我很羡慕钟超走了好运。钟超也因此每逢一谈及他的老板,就津津乐道,滔滔不绝,如数家珍地赞他老板的优点:首先是关心下属,连干部职工过生日。展开更多
Syzygium campanulatum Korth is a plant, which is a rich source of secondary metabolites （especially flavanones, chalcone, and triterpenoids）. In our present study, three conventional solvent extraction （CSE） techn...Syzygium campanulatum Korth is a plant, which is a rich source of secondary metabolites （especially flavanones, chalcone, and triterpenoids）. In our present study, three conventional solvent extraction （CSE） techniques and supercritical fluid extraction （SFE） techniques were performed to achieve a maximum recovery of two flavanones, chalcone, and two triterpenoids from S. campanulatum leaves. Furthermore, a Box-Behnken design was constructed for the SFE technique using pressure, temperature, and particle size as independent variables, and yields of crude extract, individual and total secondary metabolites as the dependent variables. In the CSE procedure, twenty extracts were produced using ten different solvents and three techniques （maceration, soxhletion, and reflux）. An enriched extract of five secondary metabolites was collected using n-hexane：methanol （1：1） soxhletion. Using food-grade ethanol as a modifier, the SFE methods produced a higher recovery （25.5%-84.9%） of selected secondary metabo- lites as compared to the CSE techniques （0.92%-66.00%）.展开更多
文摘当玻璃外壳搭配金属机械机芯,用手工艺与艺术把坚固的金属与澄澈的水晶玻璃融为一体,化无形为有形,连接着人、环境与永恒的时间。积家的Atmos空气钟构造在1928年就已经震惊世界。这个无需任何外力的钟,根据巧妙的设计,能把气温转成动力。其奥秘在于一个充满混合气体的密封罩,气体根据温度的细微变化膨胀或收缩,不断为座钟上链,一摄氏度的温差可以产生支持48小时运转的动力。爱马仕委托Les Cristalleries de Saint-Louis制造空气钟超凡的水晶玻璃罩。
文摘我和钟超都是从中文系毕业分配到 C 市的,我进了市人大办公室秘书科当一名摆弄文字的科员,而钟超到了一间国营大企业——印刷集团公司当办公室主任。开始我和钟超谈起各自的生活待遇,都觉得很不公平。钟超是出入有小车,月薪三四千,老板看得起,请吃有签单权。而我呢,出入自行车,月薪仅两千,整天爬格子,哪有签单权!因此我很羡慕钟超走了好运。钟超也因此每逢一谈及他的老板,就津津乐道,滔滔不绝,如数家珍地赞他老板的优点:首先是关心下属,连干部职工过生日。
文摘Syzygium campanulatum Korth is a plant, which is a rich source of secondary metabolites （especially flavanones, chalcone, and triterpenoids）. In our present study, three conventional solvent extraction （CSE） techniques and supercritical fluid extraction （SFE） techniques were performed to achieve a maximum recovery of two flavanones, chalcone, and two triterpenoids from S. campanulatum leaves. Furthermore, a Box-Behnken design was constructed for the SFE technique using pressure, temperature, and particle size as independent variables, and yields of crude extract, individual and total secondary metabolites as the dependent variables. In the CSE procedure, twenty extracts were produced using ten different solvents and three techniques （maceration, soxhletion, and reflux）. An enriched extract of five secondary metabolites was collected using n-hexane：methanol （1：1） soxhletion. Using food-grade ethanol as a modifier, the SFE methods produced a higher recovery （25.5%-84.9%） of selected secondary metabo- lites as compared to the CSE techniques （0.92%-66.00%）.
