排序方式: 共有55条查询结果,搜索用时 15 毫秒
21.
目的 探索汗潜指纹显现的新方法。方法 利用低温荧光摄影方法加强指纹沉积物的固有荧光强度 ,来提高汗潜指纹显现的成功率。结果 在 4 1 5nm波段激发下用黄滤色镜拍摄指纹的显现效果最好。结论 低温荧光法是一种有效的潜指纹显现的技术手段 相似文献
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Time- and Temperature-Dependent Changes in Cytochrome c Oxidase Activity and Cyanide Concentration in Excised Mice Organs and Mice Cadavers
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Poonam Singh M.Sc. Pooja Rao M.Sc. Shiv K. Yadav M.Sc. Niranjan L. Gujar M.Sc. Ravindra M. Satpute Ph.D. Rahul Bhattacharya Ph.D. 《Journal of forensic sciences》2015,60(Z1):S162-S170
Postmortem stability of cyanide biomarkers is often disputed. We assessed the time and temperature-dependent changes in cytochrome c oxidase (CCO) activity and cyanide concentration in various organs of mice succumbing to cyanide. Immediately after death, excised mice organs and mice cadavers were stored at room temperature (35°C ± 5°C) or in frozen storage (−20°C ± 2°C). At various times after death, CCO activity and cyanide concentrations were measured in excised mice organs or organs removed from mice cadavers. The study revealed that (i) measuring both the biomarkers in mice cadavers was more reliable compared to excised mice organs, (ii) measuring temporal CCO activity and cyanide concentration in vital organs from mice cadavers (room temperature) was reliable up to 24 h, and (iii) CCO activity in the brain and lungs and cyanide concentration in organs from mice cadavers (frozen) were measurable beyond 21 days. This study will be helpful in postmortem determination of cyanide poisoning. 相似文献
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The cold floor pattern (a lack of homicides on days with extremely cold temperatures that was found by Cheatwood in Baltimore)
is to be expected by chance. Under a model in which the number of homicides and the maximum temperature are independent, the
probability that a day will fall below the cold floor is small. The Baltimore data do not support a model in which extremely
cold weather suppresses human aggression. 相似文献
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Timewise temperature variations in objects that are undergoing unsteady heating or cooling is a commonly encountered problem in the thermal sciences. One particular area of application is the cooling of a body post-death and the use of body temperatures to estimate the time of death. Here, a new approach based on the theory of transient heat transfer is formulated to allow efficient calculation of unsteady conduction problems. The theoretically derived unsteady temperature models are compared with experimentally based correlations (the Marshall-Hoare-Henssge model). The two approaches are found to agree very well. With this new theoretically based approach, timewise temperature variation can be calculated for both large and small Biot number transient problems. 相似文献
25.
北京城区逆温气象特征及其对大气污染的影响 总被引:9,自引:0,他引:9
逆温是制约北京城区大气污染的主要污染气象条件.文中针对北京城区逆温气象特征和大气污染状况,采取对比分析和相关分析,探讨逆温对大气污染的影响关系及污染物排放量削减措施. 相似文献
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Kaliszan M 《Journal of forensic sciences》2011,56(5):1310-1314
Estimation of the time of death (TOD) is a very important task of forensic pathologist, and measurement of body temperature is a method deemed to be most precise during the initial postmortem period. The study aimed at verification of the significance of airflow present in the room where a corpse is found on body cooling process and hence on determination of the TOD. The experiment was performed in pigs during which the postmortem temperature of the eye, muscles, and rectum was recorded--in still air and with generated draft in the room. The results showed that the moderate airflow present in the experimental conditions did not significantly affect the course of cooling of the investigated body sites. Despite moderate wind generated in the room, the air movement close to pigs' bodies was actually minimal. This allowed to conclude that to evaluate the TOD most precisely, one should first have reliable data on the actual velocity of air in the direct vicinity of the body rather than relying on subjective sensation of the draft and using various unnecessary corrective coefficients for TOD calculation. 相似文献
28.
This paper expands on Archer (J Forensic Sci 49, 2004, 553), examining additional factors affecting ambient temperature correction of weather station data in forensic entomology. Sixteen hypothetical body discovery sites (BDSs) in Victoria and New South Wales (Australia), both in autumn and in summer, were compared to test whether the accuracy of correlation was affected by (i) length of correlation period; (ii) distance between BDS and weather station; and (iii) periodicity of ambient temperature measurements. The accuracy of correlations in data sets from real Victorian and NSW forensic entomology cases was also examined. Correlations increased weather data accuracy in all experiments, but significant differences in accuracy were found only between periodicity treatments. We found that a >5°C difference between average values of body in situ and correlation period weather station data was predictive of correlations that decreased the accuracy of ambient temperatures estimated using correlation. Practitioners should inspect their weather data sets for such differences. 相似文献
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The Phadebas® Forensic Press Test (PFPT) is an enzyme-based colorimetric test used to visualise and locate latent saliva stains on forensic exhibits. The test relies upon the presence of the enzyme α-amylase which is present in high levels in saliva. Even though the optimal in vitro temperature for α-amylase activity is 37 °C, the PFPT manufacturer’s protocol specifies that the PFPT should be carried out at room temperature (RT). In this study, we compared the performance of the PFPT at RT and 37 °C using combinations of four fabric types (cotton, polyester, acrylic and a cotton/polyester blend), three saliva dilutions (neat, 1:10 and 1:100) and stains aged for four time periods (1 day, 1 week, 1 month and 3 months). The intensity of the PFPT colour reactions at RT and 37 °C were not statistically different across all fabric types, saliva concentrations and stain ages, indicating that maximum sensitivity and performance of the PFPT can be achieved at RT. 相似文献
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