Security as Socio‐Technical Practice: Predictive Policing and (Non‐)Automation

Predictive policing is among the most prevalent new technological tools for law enforcement. Understanding how the police produce knowledge about crime and society in technologically mediated ways is important vis‐a‐vis practices of social ordering. In this paper, I suggest to draw on literature from Science and Technology Studies (STS) in order to understand the impact of technology not as analytically isolated artefact, but as embedded in socio‐technical relations that define how it comes to matter in everyday practice. In order to demonstrate what it means to think about technology in socio‐technical terms, I engage the discrepancy between the technical capacities of predictive policing applications and the ways in which they actually become part of police work on a daily basis. Specifically, I investigate how claims about the automation of crime analysis in predictive policing are reconfigured through the interplay of social and technical elements in police work.     

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。