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151.
Leighton Andrews 《Public administration》2019,97(2):296-310
Public administration scholarship has to a significant degree neglected technological change. The age of the algorithm and ‘big data’ is throwing up new challenges for public leadership, which are already being confronted by public leaders in different jurisdictions. Algorithms may be perceived as presenting new kinds of ‘wicked problems’ for public authorities. The article offers a tentative overview of the kind of algorithmic challenges facing public leaders in an environment where the discursive context is shaped by corporate technology companies. Public value theory is assessed as an analytical framework to examine how public leaders are seeking to address the ethical and public value issues affecting governance and regulation, drawing on recent UK experience in particular. The article suggests that this is a fruitful area for future research. 相似文献
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Andrews M 《U.S. news & world report》2007,143(3):73-4, 76, 78
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A fast and simple method to detect some commonly abused illicit drugs, amphetamine, methamphetamine, 3,4-methylendioxy-amphetamine (MDA), 3,4-methylendioxy-methamphetamine (MDMA), 3,4-methylendioxy-N-ethylamphetamine (MDEA) and phencyclidine (PCP) in urine using solvent microextraction (SME) combined with gas chromatography (GC) analysis has been developed. The extraction is conducted by suspending a 2 μl drop of chloroform in a 2 ml urine sample. Following 8 min of extraction, the organic solvent is withdrawn into the syringe and injected into a GC with a pulsed discharge helium ionization detector (PDHID).The effects of different extraction solvents and times, pH and sample preparation were studied. The optimized method was capable of detecting drugs in urine at concentrations below Substance Abuse and Mental Health Services Administration (SAMHSA) established cut-off values for preliminary testing. Good linearity and reproducibility of extraction were obtained. The limits of detection were 0.5 μg/ml for amphetamine, 0.1 μg/ml for methamphetamine and MDA, 0.05 μg/ml for MDMA, 0.025 μg/ml for MDEA and 0.015 μg/ml for PCP. Relative standard deviation (R.S.D.) values ranged between 5 and 20% for the studied drugs. 相似文献
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Postmortem pink teeth. 总被引:1,自引:0,他引:1
W R Kirkham E E Andrews C C Snow P M Grape L Snyder 《Journal of forensic sciences》1977,22(1):119-131
A series of cases is reported in which pink teeth were observed during the postmortem period. Most cases were associated with decomposition in a moist environment. Experimental procedures led to the extraction of pink material from dentin and demonstration that hemoglobin and serum proteins were present. The pink-tooth phenomenon was duplicated in human teeth by instilling into the pulp chambers whole blood and blood with the red cells hemolyzed. The change was manifested in teeth of dogs after freezing, heating, and decomposition in a moist environment. The authors postulate that pink teeth occur as a result of breakdown of red blood cells in the pulp chamber of the tooth and diffusion of hemoglobin and other serum proteins into the dentin via the dential tubules. Histochemical studies show that the brown or gray material in some teeth subjected to postmortem aging is probably hemoglobin and serum proteins. Factors of age, vascularity of the pulp chamber, and postmortem conditions are discussed in relation to the postmortem development of pink teeth. 相似文献
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