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通过对200余种透明胶带紫外导数光谱分析,确定了最佳分析条件,验证了分析方法的重现性和稳定性。分析了不同胶带紫外导数光谱产生变化的原因,证明紫外导数光谱法是一种快速、简单、可靠、实用的鉴别透明胶带来源的方法。 相似文献
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紫外光谱法测定尿液中安眠类药物的含量 总被引:4,自引:0,他引:4
本文应用紫外可见光谱法研究了苯并二氮 类、吩噻嗪类药物的测定方法,分析的药物在0μg·ml-1~20μg·ml-1内有良好的线性关系。提出了利用固相萃取技术测定尿液中药物的简便、快速的方法,测定尿液中药物的检出限为1.0μg·ml-1,回收率为77.5%-101.2%。 相似文献
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目的建立一种快速鉴定血痕陈旧度的方法。方法在实验室条件(20℃、25℃、30℃)下,使用UV-2450型紫外可见分光光度计,利用反射附件ISR-240A积分球,以BaSO_4标准白板做参比,间隔一定时间测定健康人耳静脉血血痕纱布的反射光谱,采集特定波长反射率R_(541)、R_(577),计算R_(541)/R_(577)值,使用SPSS 17.0软件进行直线拟合与回归分析。结果一定条件下8 h内,血痕经历时间与其特定波长紫外可见反射率比值回归分析的R~2均大于0.8,回归方程成立,血痕经历时间与R_(541)/R_(577)值具有高度相关性。结论所建立的方法简便、快速、无损,可靠性好,可以对实验室条件下8 h内血痕经历时间进行鉴别。 相似文献
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Erin E. Waddell Ph.D. Jessica L. Frisch‐Daiello Ph.D. Mary R. Williams M.S. Michael E. Sigman Ph.D. 《Journal of forensic sciences》2014,59(5):1198-1204
Gas chromatography–mass spectrometry (GC–MS) data of ignitable liquids in the Ignitable Liquids Reference Collection (ILRC) database were processed to obtain 445 total ion spectra (TIS), that is, average mass spectra across the chromatographic profile. Hierarchical cluster analysis, an unsupervised learning technique, was applied to find features useful for classification of ignitable liquids. A combination of the correlation distance and average linkage was utilized for grouping ignitable liquids with similar chemical composition. This study evaluated whether hierarchical cluster analysis of the TIS would cluster together ignitable liquids of the same ASTM class assignment, as designated in the ILRC database. The ignitable liquids clustered based on their chemical composition, and the ignitable liquids within each cluster were predominantly from one ASTM E1618‐11 class. These results reinforce use of the TIS as a tool to aid in forensic fire debris analysis. 相似文献
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William Frizzell M.D. Lindsay Howard D.O. Henry Cameron Norris B.A. Joseph Chien D.O. 《Journal of forensic sciences》2019,64(4):1259-1265
Interest in the relationship between autism and violence has increased in recent years; however, no link has clearly been established between them. Researchers remain curious if autistic people with certain traits (e.g., a history of trauma) are at greater risk of violence than those individuals with autism alone. In this article, we detail two individuals with homicidal ideation (HI) admitted to inpatient psychiatric units who were found to have a diagnosis of autism without language impairment. These cases illustrate the need for mental health providers to consider autism in their differential diagnosis when evaluating an individual with HI. Broadly, we consider how an autistic individual could be susceptible to developing HI and explore treatments specific to autistic individuals that may be helpful in such cases. 相似文献
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This article describes legal and human rights issues in three cases of transnational online offending involving extradition requests by the United States (US). These cases were selected as all suspects claimed the negative impacts of autism spectrum disorders (ASDs) were sufficient to deny extradition on human rights grounds. We demonstrate how recent developments in UK and Irish extradition law raise human rights and prosecutorial challenges specific to online offending that are not met by established protections under domestic and internationally sanctioned approaches to extradition or human rights law. In these cases, although the allegedly unlawful conduct occurred exclusively online and concurrent jurisdiction enables prosecution at both the source and location of harm, we demonstrate why national courts hearing extradition challenges are extremely reluctant to shift the trial forum. We conclude by discussing the implications of the new geographies of online offending for future criminological research and transnational criminal justice. 相似文献
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根据红外谱图的相似程度决定两种涂料是否属同一种类的涂料是最基本也是最初级的检验方法,不可避免地带有极大的盲目性,只有把握了特征峰所代表的基团的振动形式,才能准确地识谱,正确地鉴别.本文介绍了氨基树脂漆的傅立叶变换红外光谱分析及谱图解释. 相似文献