In the UK forensic animations are becoming an increasingly important visual aid in courtroom situations,where complex data relating to a sequence of events is being visualized before a general public who may have little or no understanding of established forensic procedure or methodology. This paper will introduce and discuss a spectrum of new technologies that use new developments in Computer Graphics (CG) and Virtual Reality (VR) for a range of incident investigation and presentation scenarios.
The detection of adulteration of fuels and its use in criminal scenes like arson has a high interest in forensic investigations. In thiswork, a method based on gas chromatography (GC) and neural networks (NN) has been developed and applied to the identification and discrimination of brands of fuels such as gasoline and diesel without the necessity to determine the composition of the samples.The study included five main brands of fuels from Spain, collected from fifteen different local petrol stations. The methodology allowed the identification of the gasoline and diesel brands with a high accuracy close to 100%, without any false positives or false negatives. A success rate of three blind samples was obtained as 73.3%, 80%, and 100%, respectively. The results obtained demonstrate the potential of this methodology to help in resolving criminal situations.
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Free-burning experimental fires were conducted in a wind tunnel to explore the role of ignition type and thus fire spread mode on the resulting emissions profile from combustion of fine (< 6 mm in diameter) Eucalyptus litter fuels. Fires were burnt spreading with the wind (heading fire), perpendicular to the wind (flanking fire) and against the wind (backing fire). Greenhouse gas compounds (i.e. CO2, CH4 and N2O) and CO were quantified using off-axis integratedcavity-output spectroscopy. Emissions factors calculated using a carbon mass balance technique (along with statistical testing) showed that most of the carbon was emitted as CO2, with heading fires emitting 17 % more CO2 than flanking and 9.5 % more CO2 than backing fires, and about twice as much CO as flanking and backing fires. Heading fires had less than half as much carbon remaining in combustion residues. Statistically significant differences in CH4 and N2O emissions factors were not found with respect to fire spread mode. Emissions factors calculated per unit of dry fuel consumed showed that combustion phase (i.e. flaming or smouldering) had a statistically significant impact, with CO and N2O emissions increasing during smouldering combustion and CO2 emissions decreasing. Findings on the equivalence of different emissions factor reporting methods are discussed along with the impact of our results for emissions accounting and potential sampling biases associated with our work. The primary implication of this study is that prescribed fire practices could be modified to mitigate greenhouse gas emissions from forests by judicial use of ignition methods to induce flanking and backing fires over heading fires.
This report describes new full-scale compartment fire experiments, which include localmeasurements of temperature, heat flux and species composition, and global measurements ofheat release rate and mass burning rate. The measurements are unique to the compartment fireliterature. By design, the experiments provided a comprehensive and quantitative assessment ofmajor and minor carbonaceous gaseous species and soot at two locations in the upper layer offire in a full scale ISO 9705 room .
Fire protection engineers, fire researchers, regulatory authorities, fire service and lawenforcement personnel use fire models (such as the NIST Fire Dynamics Simulator, FDS) fordesign and analysis of fire safety features in buildings and for post-fire reconstruction andforensic applications. Fire field models have historically showed limited ability to accuratelyand reliably predict the thermal conditions and chemical species in underventilated compartmentfires. Formal validation efforts have shown that for well ventilated compartment fires, with theexception perhaps of soot, field models do quite well in predicting temperature and species whenexperimental uncertainty is accounted for. Inaccurate predictions of incomplete burning and sootlevels impact calculations of radiative heat transfer, burning rates, and estimates of humantenability. High-quality (relatively low, quantified uncertainty) measurements of fire gasspecies, temperature, and soot from the interior of underventilated compartment fires are neededto guide the development and validation of improved fire field models.
From Out of the Abyss...
This week’s article from the past is titled Incendiary Fires Can Be Spotted and was written by Benjamin Horton, CPCU, who was President of the National Adjuster Traing School in Louisville, Kentucky.. It is taken from the Decembe 1968 Vol. XVI No.5 issue.
Incendiary Fires Can Be Spotted
The open kitchen design in small residential units where fire load density and occupant load are very high introduces additional fire risk. One big concern is that whether flash-over can occur which may trigger a big post flashover fire, resulting in severe casualties and big property damage. It is important to understand and predict the critical conditions for flashover in this kind of units. Based on a two-layer zone model, the probability of flashover is investigated by a nonlinear dynamical model. The temperature of the smoke layer is taken as the only state variable and the evolution equation is developed in the form of a simplified energy balance equation for the hot smoke layer. Flashover is considered to occur at bifurcation points. Then the influence of the floor dimensions and the radiation feedback coefficient on flashover conditions is examined. When the dimensions of the floor vary, the resulting changes in internal surface area or size of floor area both have effect on the flashover conditions. When the radiation feedback coefficient is of small value, there is no possibility of flashover. With the increase of the radiation feedback coefficient, at first it significantly affects the conditions for flashover and then moderately when it reaches a larger value. It is proved that the flashover phenomenon can be demonstrated well by nonlinear dynamical system and it helps to understand the effect of various control parameters.
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This recall involves Limoss AKKU-PACK rechargeable lithium ion battery power packs sold as accessories for Palliser, Flexsteel and Best Home Furnishing power recliners and lift chairs. They are used to power the chair when an electrical outlet is not available. “Limoss Li-ion Battery Pack,” model number ZB-B1800, code MC 160 and dates codes of 11-0102011 through 6-14-2012 are printed on a white sticker on the side of the unit. Recalled battery power packs are black and measure 6 inches long by 3 inches wide.
Read the full details at CPSC.
This recall involves the EFLC1105 E-flite Ultra Micro-4, 4x9W, AC/DC Battery Charger from E-flite. The charger has four independently functioning charge circuits with a LED status display. Each port can charge one 30–150mAh, 1S UM cell, a 1S MCPX cell, or one 120–300mAh 2S pack equipped with a JST-PH, 3-wire connector. The charger measures 5 inches tall by 7 inches wide by 1.5 inches deep. The charger is blue with a gray, black and blue faceplate with white and black type. “Eflite Celectra UMX-$ Battery Charger” is printed across the center of the charger.
See the full details at CPSC
This recall involves Nestlé three and five gallon cold and hot water dispensers. The units are white and silver in color and measure about 38 inches tall by 13 inches wide. Water is dispensed from the large plastic water bottle on the top of the unit through the machine by pushing on the paddles below that are marked with blue for cold water and red for hot water. The Nestlé Waters North America logo is on the front of the units. Only the following model and serial numbers are included in this recall. The model and serial numbers are printed on a white sticker on the back of the units.
Details can be seen at CPSC.
July 14, 2015
Last week, General Motors announced that it would recall nearly 196,000 Hummer vehicles because simply turning on the heating or cooling system could set the car ablaze.While we reported that federal regulators had received nearly two dozen consumer complaints about the issue over the past seven years, a new report finds that the real number of reported incidents is much higher, and that GM may have continued to put off issuing the recall had it not been for threats of an investigation.
Jalopnik, citing sources with the National Highway Traffic Safety Administration, reported earlier today that General Motors only recalled the model year 2006 to 2010 Hummer H3 and model year 2009 to 2010 H3T after regulators threatened to open a formal investigation into the issue.
According to GM, the issue with the Hummer vehicles is related to an electrical part in the heating and cooling system that can overheat and cause a fire inside the dashboard.
Jalopnik reports that the first fire related to the blower issue occurred in August 2008 and was reported to NHTSA the following month.
However, a chronology report [PDF] posted by NHTSA at the time of the recall alleges the company only learned about the issue after receiving two consumer complaints through its Speak Up For Safety program in September 2014.
This recall involves Heat-N-Glo® and Heatilator® Corner Unit Series indoor gas fireplaces. The fireplaces are LP or NG-fueled corner units with tempered glass fronts. The following model numbers are printed on the unit rating plate, located near the controls used to operate the units, and in the instruction manual.
See the full details at CPSC
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