Kinetics of nitric oxide formation and decomposition

Experiments on shock wave structure were conducted in the 12 inch shock tube facility, and it is shown that this work was motivated by the need for improved kinetics for the modeling of NO production in space shuttle flow fields. The experiments on shock structure involved simultaneous observations of pressure and temperature on the wall of the shock tube during reflection of normal shock waves in inert gases

Kinetics of the reaction of nitric oxide with hydrogen

Mixtures of NO and H2 diluted in argon or krypton were heated by incident shock waves, and the infrared emission from the fundamental vibration-rotation band of NO at 5.3 microns was used to monitor the time-varying NO concentration. The reaction kinetics were studied in the temperature range 2400-4500 K using a shock-tube technique. The decomposition of nitric oxide behind the shock was found to be modeled well by a fifteen-reaction system. A principle result of the study was the determination of the rate constant for the reaction H + NO yields N + OH, which may be the rate-limiting step for NO removal in some combustion systems. Experimental values of k sub 1 were obtained for each test through comparisons of measured and numerically predicted NO profiles

“She keeps his secrets”: A gendered analysis of the impact of shame on the non-disclosure of sexual violence in one low-income South African community

Sexual violence against women and girls forms part of a global pandemic of human rights violations. In South Africa, crimes of sexual violence are at a globally unprecedented level. The majority of these crimes of sexual violence are underreported. Understanding the factors that contribute to the silence around sexual violence is pivotal, not only so that perpetrators can be held accountable, but also so that victims/survivors of sexual violence may experience some alleviation from the psychological symptoms related to internalised trauma. This paper, a case study which utilises a social constructionist research paradigm, focuses on the lived experience of one depressed South African woman, Zee, who lives in a low-income South African community. Her accounts of sexual, physical and emotional abuse are discussed, focusing specifically on how she constructs the impact of shame on the non-disclosure of sexual violence. The authors suggest that the relationship between shame and non-disclosure is complex, in that larger societal discourses play a pivotal role in the shame of women who are victims/survivors of sexual violence. On the one hand, as in the case of Zee’s community, sexual violence and the painful emotions associated with such violence are obscured in a communal complicity of silence. On the other hand, powerful gender discourses also compel women to be silent and passive.Keywords: Shame; non-disclosure; sexual violence; gender; agency; communit

Decomposition of NO studied by infrared emission and CO laser absorption

A diagnostic technique for monitoring the concentration of NO using absorption of CO laser radiation was developed and applied in a study of the decomposition kinetics of NO. Simultaneous measurements of infrared emission by NO at 5.3 microns were also made to validate the laser absorption technique. The data were obtained behind incident shocks in NO-N2O-Ar (or Kr) mixtures, with temperatures in the range 2400-4100 K. Rate constants for dominant reactions were inferred from comparisons with computer simulations of the reactive flow

A Future View of Mental Health

Hogg Foundation for Mental Healt

A New Spinning-test Method

This report contains a description of a new spinning-test arrangement wherein the otherwise customary rotation of the model about a fixed axis is abandoned in favor of a corresponding rotation of the air stream. The advantage of this method lies in the fact that the model is at rest while the spin is recorded. In this manner it is possible to secure systematic results with little loss of time while employing 3- or 6-component wind-tunnel balances. The troublesome equalization of the mass forces is eliminated and the flow phenomena are accessible to direct observation