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Wu Y.,Key Laboratory of Fire Scene Investigation and Evidence Identification | Wu Y.,Shenyang Fire Research Institution | Han D.-C.,Shenyang Gas Cylinder Safety Technology Co.
Advanced Science Letters | Year: 2012

The in-depth composition of carbon and oxygen in copper beads formed by arc and fire were studied by XPS, respectively. Corresponding to the sputtering depth, the molten product on an arc bead surface layer is with drastic decrease of carbon content and with gentle change of oxygen content which then rapid decreases. While the molten product on a fire bead surface layer is with carbon content decreasing gradually and with oxygen content increasing. As a result, the distributing of C and O and the quantitative results can be used to identify the molten product on a bead induced directly by arc and the molten product on a bead formed by fire, as complementary technique for judgments of fire cause. © 2012 American Scientific Publishers. All rights reserved.


Liu S.J.,Shenyang Fire Research Institution | Xu H.N.,Shenyang Normal University | Feng K.,Shenyang Normal University | Wang Y.,Shenyang Normal University
Applied Mechanics and Materials | Year: 2014

Dust samples of gasoline and disruptors combustion were analyzed by GC-MS/MS. The use of GC-MS/MS determination in the SRM mode, provided the unequivocal identification of the target analytes. The results show that in the gasoline combustion dust samples containing mainly fluorene, phenanthrene, anthracene, fluoranthene, pyrene and other PAHs. GC-MS/MS is an invaluable analytical technique in suspected arson cases. © (2014) Trans Tech Publications, Switzerland.


Wu Y.,Shenyang Fire Research Institution | Han D.,Shenyang Gas Cylinder Safety Technology Co.
Mechanika | Year: 2012

Electrical distribution wires with melted ends showing beaded, drop-shaped, and pointed shapes are frequently encountered after fires, which may be provide useful information on the cause and development of the fire. Various methods have been studied for identifying between primary melted marks (PMM), indicating arcing as the cause of the fire, and secondary melted marks (SMM), indicating arcing as a result of the fire. But in some major cases, PMM and SMM are difficultly identified just using one method. In this study, a correlation of such behavior with some macroscopic, the in-depth composition of carbon and oxygen quantitative analysis, the composition and the chemical state in the near-surface regions, and metallurgical analysis of PMM and SMM has been studied. As a result, the given fire cause is the integrative judgments of these methods.


Liu S.J.,Shenyang Fire Research Institution | Xu H.N.,Shenyang Normal University | Feng K.,Shenyang Normal University | Wang Y.,Shenyang Normal University
Applied Mechanics and Materials | Year: 2013

A procedure to quantify volatile, organic sulfur compounds in gasoline was developed using solid-phase microextraction to preconcentrate the analyses followed by GC and detection with a sulfur chemiluminescence detector (SCD). The effects of temperature, time and PDMS fibers types on the extraction of gasoline has been investigated. The results show that a range of sulfur compounds were identified in gasoline. 75um PDMS, 30min, and 50°C were the optimum extraction conditions. Using the developed method can be used to identify gasoline residues in the fire. © (2013) Trans Tech Publications, Switzerland.


Liu S.J.,Shenyang Fire Research Institution | Yu L.L.,Shenyang Fire Research Institution | Xu H.N.,Shenyang Normal University | Feng K.,Shenyang Normal University | Wang Y.,Shenyang Normal University
Advanced Materials Research | Year: 2013

The application of solid phase microextraction-gas chromatography/mass spectrometry (SPME-GC/MS) to the analysis of the timeliness of burned gasoline analysis adsorbed on the floor carrier was studied in this artical, meanwhile the effects of temperature, wind speed and humidity on the timeliness of burned gasoline analysis adsorbed on the floor carrier has been investigated. The results show that temperature is the major factor that affects the timeliness of analysis of burned gasoline residues analysis, followed by humidity, and finally the wind speed, and the corresponding data of timeliness, derived equations and correlation are provided. © (2013) Trans Tech Publications, Switzerland.

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