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Journal
Iranian Journal of Physics; ISSN 0254-9611; 
; v. 2(4); p. 325
; v. 2(4); p. 325
[en] We investigate the influence of material dispersion on the mechanism of self-shortening of femtosecond pulses interacting with fused silica plates having thicknesses an order of magnitude smaller than the dispersion length for the initial 72-fs pulse. The femtosecond pulse self-shortening is observed at large values of the B integral, when small-scale self-focusing develops in the central part of the pulse; this self-focusing plays the role of an optical shutter selecting the unperturbed radiation of the pulse leading edge. A study of the femtosecond pulse self-shortening in 1- and 3-mm-thick fused silica samples reveals that, under the experimental conditions in use, the self-phase modulation enhances the role of dispersion in the formation of a shortened pulse. With an increase in the sample thickness, the shortened pulse width increases as a result of the dispersion spread of the initial pulse in time. At the same time, this shortened pulse remains close to the transform-limited one, independent of the sample thickness. (paper)
Journal
[en] The problem of environmental protection is one of the most pressing at present. Internal combustion engines (ICE) play a large role in environmental pollution. In large cities, they are the main sources of toxic substances emitted into the atmosphere. Harmful emissions of automotive engines cause serious diseases in people and farm animals, reduce crop yields (up to 25%) and reduce the quality of crops (potatoes, corn, grains, etc.), especially in the roadside highways. To reduce emissions of particulate matter, a particulate filter has been developed, in which the porous mesh material P300 and P685, one-sided twill mesh, is used as the filter material. Tests of the developed particulate filter show high efficiency of its work. The efficiency of cleaning from soot (ηC) during the diesel engine operation on the external speed characteristic for the C685 grid шs 90 ÷ 94%, for the P300 grid of three layers – 83÷92%, for the P300 grid of two layers – 71÷82%. (paper)
Journal
IOP Conference Series. Materials Science and Engineering (Online); ISSN 1757-899X; ; v. 632(1); [4 p.]
; v. 632(1); [4 p.]
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