Soot is a combustion generated pollutant that is both a direct risk to human health and a contributing source to global environmental change. Soot can also be a controlling factor in heat transfer inside combustion systems. Thus there is a growing interest in being able to measure soot and understand its production in practical, turbulent combustion environments. Therefore, the specific objectives of this research work were: (1) developing a way to measure velocity of sooty regions that is compatible with existing methods for measuring temporally and spatially resolved soot concentration fields and (2) using these methods to make quantitative measurements of soot in an unsteady, turbulent-like combustor. The Particle Vaporization Velocimetry (PVV) technique was developed and is compatible with Laser Induced Incandescence (LII), a soot concentration measurement approach. PVV is a flow tagging approach, where a high intensity laser (~2-3 J/cm2) is used to vaporize a small region in the soot field. This approach was demonstrated to produce a long lasting and easily readable flow tag that allows for velocity measurements over a wide range of velocities. LII proved to be the best method for detection the motion of the tag after a fixed delay. PVV and LII were used to measure velocity and two-dimensional soot concentration fields in an acoustically excited burner. In addition, images of soot luminosity were obtained. Both laminar and transitional acetylene diffusion flames were studied. The results reveal that strong acoustic forcing can significantly reduce total flame soot, as well as maximum soot concentrations, while simultaneously increasing the average soot temperature. The influence of acoustically generated vortices on soot formation was studied, and soot and products mixture mostly likely dominant high soot concentration regions. Eventually, these mixtures will be propagated downstream and oxidized as a diffusion flame.

The covid-19 pandemic has hit every part of life hard. From visiting the supermarket to halting world trade. One of the most obvious effects of the pandemic has been the political one. All across the world political parties have been competing for power during these unusual times.  This paper will analyze whether populistic parties around Europe have changed their views on the covid-19 pandemic restrictions. In order to analyze this a comparative idea analysis will be used in order to compare and analyze political parties views on this subject. In order to conduct this analysis the studie compare four different populistic parties around europé. These parties are as followed, AFD and Die Linke in germany, PVV in the Netherlands followed by Syriza in Greece. The study will be using material from the four different parties to conduct the analysis and compare the material. The analysis shows that only one out of four parties has had a change in their views on the pandemic restrictions. This study is an important contribution the field of populism. It will grant a unique opportunity to study such a unique time of our the world that the covid-19 pandemis really is.