北京信息化与经济增长——基于ICT资本存量和Ubiquitous指数的分析

信息化对经济增长的影响主要表现在信息化投资和信息化资源利用两个方面,在核算ICT资本存量和建立Ubiquitous指数的基础上,需要将ICT投资和信息化的普及与应用纳入一个统一的框架进行分析.利用ICT增长模型对ICT投资贡献度以及网络外部性的计量分析表明,ICT投资对北京经济增长发挥了重要作用,ICT投资与普及应用之间的交互作用产生了明显的溢出效应和网络效应,从而进一步增强了ICT对经济增长的影响力.软件投资与硬件投资相比较,软件投资的作用更为显著,对北京经济增长的影响更大.     

Preparation of a low-cost fingerprint powder that harnesses white light to emit long-lived phosphorescence

An inexpensive, commercially available doped strontium aluminate phosphor with long-lived afterglow has been prepared and assessed in the role of a luminescent fingerprint dusting powder. Blue, green, and aqua phosphorescence persisting for ca. 30 s was obtainable from treated fingermarks after charging the powders with the white light (400–700 nm) setting of a forensic light source. Imaging the phosphorescent afterglow enabled the elimination of background emissions encountered during latent fingermark examination. This was demonstrated by visualising fingermarks on substrates that possess inbuilt fluorescent security features and highly patterned substrate backgrounds, without any need for bespoke scientific equipment.     

小儿智力咀嚼片提取工艺研究

目的优选小儿智力咀嚼片的最佳提取工艺。方法以远志酸的含量为指标,利用正交设计法考察溶剂种类、溶剂用量、提取时间以及提取次数对实验的影响,确定最佳提取工艺参数。结果最佳提取工艺参数为:以60%乙醇为溶剂,加10倍量,提取0.5 h,提取2次。结论该工艺可用于小儿智力咀嚼片的提取。