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41.
A method was developed to screen for pepper spray residue using instruments and methods other than those techniques commonly employed to analyze chemical residue (i.e.. gas chromatography mass spectrometry-GCMS or liquid chromatography mass spectrometry-LCMS). The method employed gas chromatography (GC), thin layer chromatography (TLC), and diffuse reflectance infrared Fourier transform spectroscopy (DRIFTS) to screen for dried pepper spray stains. Pepper sprays from nine different manufacturers were investigated. Capsaicin and dihydrocapsaicin were identified and unique IR reflectance spectra are presented. An additional five compounds were presumptively found. Results showed that a particular stain could be characterized as a pepper-based stain. 相似文献
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The presence of cocaine in illicit drug samples is still being determined in some laboratories using spot tests and microcrystal tests. Seventeen chemical species were tested using three different spot tests (Wagner, Marquis, and cobalt thiocyanate followed by stannous chloride reactions) and two microcrystal tests (gold chloride and platinic chloride) to determine whether the results could be differentiated from the results of these tests on cocaine. The data obtained indicated that nine of the 17 compounds gave results similar to those from cocaine using the three spot tests, but that the results from microcrystal testing allowed for differentiation of all nine compounds from cocaine. 相似文献
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M. Kay Jankowski Harold Leitenberg Kris Henning Patricia Coffey 《Journal of family violence》1999,14(3):267-279
The present study examined the association between witnessing interparental violence as a child, and the risk for perpetrating and being the victim of dating aggression as an adult, in an undergraduate sample. Specifically, this study tested a modeling hypothesis whereby witnessing a same sex parent vs. an opposite sex parent exclusively in the aggressor role would be more highly associated with risk for perpetrating dating aggression. Similarly, observing a same sex parent vs. an opposite sex parent as exclusively a victim of marital aggression would be associated with risk for being a victim of dating aggression. A same sex modeling effect was found for perpetration of dating aggression. Respondents who witnessed only their same sex parent perpetrate physical marital aggression were at increased risk for perpetrating physical dating aggression, whereas respondents who witnessed only their opposite sex parent perpetrate were not. A same sex modeling effect, however, was not found for being a victim of dating aggression. Rather, risk for victimization by dating aggression was associated only with witnessing bidirectional marital violence. Implications of these results, limitations of the present study, and ideas for future research are discussed. 相似文献
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当前大学生恋爱中不良倾向的分析与思考 总被引:5,自引:0,他引:5
当前在大学生恋爱中存在的低龄化、休闲化、时尚化、体验化、实用化、“快餐化”和放纵化等不良倾向,对大学生的成长和成才构成了很大威胁。学校必须加强对大学生恋爱的教育、管理和指导。 相似文献
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Kris Mohandie Ph.D. J. Reid Meloy Ph.D. A.B.P.P. Peter I. Collins M.C.A. M.D. F.R.C.P. 《Journal of forensic sciences》2009,54(2):456-462
Abstract: The frequency and characteristics of suicide by cop cases (SBC) among a large (n = 707) nonrandom sample of North American officer-involved shootings (OIS) were investigated. “Suicide by cop” is when a subject engages in behavior which poses an apparent risk of serious injury or death, with the intent to precipitate the use of deadly force by law enforcement against the subject. Thirty-six percent of the OIS in this sample were found to be SBC with high interrater agreement (intraclass correlation coefficient = 0.93) for category classification. SBC cases were more likely to result in the death or injury of the subjects than regular OIS cases. Most SBC cases were spontaneous, but had clear verbal and behavioral indicators that occurred prior to, and during the event. Findings confirm the trend detected in earlier research that there was a growing incidence of SBC among OIS. SBC individuals had a high likelihood of possessing a weapon (80%), which was a firearm 60% of the time. Half of those with a firearm discharged it at the police during the encounter. Nineteen percent simulated weapon possession to accomplish their suicidal intent. Other findings highlight the histories and commonalities in this high risk group. 相似文献
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The interpretation of bloodstain patterns at crime scenes has received increased attention in recent years. Important to an understanding of this is knowledge of the fundamentals of blood droplet formation and impact dynamics. A review of the literature reveals that a considerable amount of work has been done with aqueous drop dynamics. Workers in the forensic science area seem to have been unaware of this. In addition, some of the most important and comprehensive early work with blood droplet dynamics seems to have been forgotten. It is not cited in more recent publications dealing with bloodstain pattern interpretation. This literature is reviewed and discussed as well. The present study presents results of experiments with blood droplet dynamics and high-speed photographs of blood droplet impacts on stationary target surfaces. Some longstanding misconceptions of importance to forensic scientists engaged in crime scene reconstruction are discussed. 相似文献