The by-products of illegal synthetic of methamphetamine was analyzed by using GC/MS. The reaction mechanism of producing methamphetamine via reducing ephedrine was studied. The exist of medium products 1,2-dimeghyl-3-...The by-products of illegal synthetic of methamphetamine was analyzed by using GC/MS. The reaction mechanism of producing methamphetamine via reducing ephedrine was studied. The exist of medium products 1,2-dimeghyl-3-phenzenylazirdine and phenyl-2-propanone also be investigated.展开更多
文摘目的分析亲密伴侣杀人(intimate partner homicide,IPH)案的独立影响因素,构建IPH预测模型,为案犯刻画提供依据。方法收集广东省2014年1月1日—2020年12月31日法院已判决命案资料共476例作为建模数据,根据案犯与被害人是否为亲密伴侣将案例分为IPH组(n=180)和非亲密伴侣杀人(nonintimate partner homicide,N-IPH)组(n=296)。采用Logistic回归构建模型,通过受试者操作特征(receiver operating characteristic,ROC)曲线分析对模型进行评价并绘制列线图。采用十折交叉验证法进行内部验证。随机收集国内非广东省2011年1月1日—2020年12月31日的法院判决书126例进行外部验证。结果通过多因素Logistic回归分析,最终筛选出7个变量纳入模型。模型Hosmer-Lemeshow拟合优度检验结果为χ^(2)=13.158,P=0.068。ROC曲线下面积(area under the curve,AUC)为0.939(95%CI:0.919~0.959),cutoff值为0.292,敏感度为0.900,特异度为0.865,校准曲线在理想曲线附近。十折交叉验证结果显示准确率为0.863,Kappa值为0.708,外部验证结果显示AUC为0.922(95%CI:0.872~0.971),cut-off值为0.292,敏感度为0.890,特异度为0.886,校准曲线趋于理想曲线。结论基于法医现场学指标构建的IPH模型预测能力良好,准确性和稳定性可靠,可为案犯刻画提供科学方法。
文摘The by-products of illegal synthetic of methamphetamine was analyzed by using GC/MS. The reaction mechanism of producing methamphetamine via reducing ephedrine was studied. The exist of medium products 1,2-dimeghyl-3-phenzenylazirdine and phenyl-2-propanone also be investigated.
