In June 2012, an IARC Monographs Working Group reevaluated the carcinogenic hazards to humans of diesel and gasoline engine exhausts, and of some nitroarenes that are found in these emissions. Diesel engine exhaust was classified as “carcinogenic to humans” (Group 1) and gasoline engine exhaust as “possibly carcinogenic to humans” (Group 2B). The most influential epidemiological studies on canc...

An adaptive-passive quarter-wave tube resonator silencer was experimentally tested using recorded in-duct reciprocating engine exhaust noise. The exhaust noise was re-played through a loudspeaker attached to one end of a duct, and the adaptive passive system was able to track changes in engine speed and provide attenuation of the noise at the fundamental firing frequency of the engine and the t...

An analysis of the requirements for mechanical smoke exhaust in large space buildings was made and some experiments in a fire test atrium have been performed. It can be concluded that the temperature of smoke in large space building fire is usually quite low which makes them easy to descend and to mix with air. Usually it’s difficult to control the descending of a smoke layer effectively when t...

Emission systems and devices are required on automobile engines to reduce air pollution problems. Catalytic converters have been used on most 1975 and newer automobiles to reduce hydrocarbon and carbon monoxide (CO) emissions to a value that meets the Environmental Protection Agency requirements established for 1975 and 1976. The 1980-1981 Boise, Idaho, study shows that with a functioning catal...

The Society of Automotive Engineers’ (Sm) Detroit World Congress in the Cob0 Center (5th-8th March) was a great success, with some 50,000 delegates, and about 1300 technical presentations. There were many well-attended sessions on the control of engine exhaust emissions, and this selective review focuses on papers concerned with platinum group metal @gm) catalysts. Platinum oxidation catalysts ...

Original scientific paper In principle, an exhaust system influences the maximum output and characteristic of a two-stroke combustion engine. The first part of the contribution deals with the possibility of transformation in a maximum output and a range of exploitable speed values by means of the change of exhaust manifold length in exhaust pipe section. This knowledge covers an output curve va...

Digital Signal Processing (DSP) technology continues to transform radar systems and SDR systems. DSP technology has made it possible to improve dramatically the gains in radar sensitivity, range and image quality, as well as the gains in the SDR radio performance, data bandwidth and power efficiency. Next generation radars with SDR systems can leverage advancing DSP technology with advanced tec...

VarioCam technology allows adjustment of the camshaft angle and is set to provide optimum performance for each Porsche engine. For example, in the Boxster, the camshaft angle can be adjusted by as much as 40 degrees compared to the crankshaft, reducing charge cycle losses, improving power, fuel consumption and keeping exhaust emissions to a minimum. In the Cayenne, an adjustment of up to 25 deg...