scholarly journals Advanced diagnostics for impact-flash spectroscopy on light-gas guns.

2007 ◽  
Author(s):  
William George Breiland ◽  
William Dodd Reinhart ◽  
Paul Albert Miller ◽  
Justin L Brown ◽  
Thornhill, Tom Finley, III (, ◽  
...  

The explosive oxidation of acetylene, initiated homogeneously by the flash photolysis of a small quantity of nitrogen dioxide, has been investigated by flash spectroscopy. The absorption spectra of OH, CH, C 2 (singlet and triplet), C 3 , CN and NH, a number of which have not previously been observed, are described, and the relative concentrations, at all times throughout the explosion, are given. Four stages have been distinguished in the explosive reaction: 1. An initial period during which only OH appears. 2. A rapid chain branching involving all the diatomic radicals. 3. Further reaction, occurring only when oxygen is present in excess of equimolecular proportions, during which the OH concentration rises exponentially and the other radicals are totally consumed. 4. A relatively slow exponential decay of the excess radical concentration remaining after completion of stages 2 and 3. The duration of stage 1 is 0 to 3 ms. In an equimolecular mixture at 20 mm total pressure, containing 1.5 mm NO 2 , the durations of both stage 2 and stage 3 are approximately 10 -4 s and the half-life of OH in stage 4 is 0.28 ms. A preliminary interpretation of these changes and of the radical reactions is given.


1951 ◽  
Vol 22 (3) ◽  
pp. 360-361 ◽  
Author(s):  
J. H. McMillen ◽  
R. L. Kramer ◽  
D. E. Allmand
Keyword(s):  

Author(s):  
Lona Moutafidou

In Kenneth Lonergan’s film Manchester by the Sea, screened in 2016, Lee commits a life-changing mistake: on his way to the mini-market, he forgets to put the screen on the fireplace. Upon his return, he becomes a numbed witness to the spectacle of his own family tragedy as the authorities remove his children’s bodies from the burning house scene. This significant event is represented through a sequence of flashbacks, which designates said cinematic device as one of the film’s most important features. Indeed, in The Trauma Question, Roger Luckhurst approaches the flashback as “the cinema’s rendition of the frozen moment of the traumatic impact . . . flash[ing] back insistently in the present because the image cannot yet or perhaps ever be narrativized as past.” Years after the incident, and still unable to address the wound of his parental negligence and child-death trauma, Lee dreams of his dead daughter suggestively asking, “Daddy, can’t you see we are burning?” The question echoes the one from Freud’s The Interpretation of Dreams, where another father dreams of his dead child being burnt. In Unclaimed Experience: Trauma, Narrative, and History, Cathy Caruth examines Freud and Lacan’s analysis of this question as to the significance of grief articulation, trauma coping and trauma persistence in sleep and awaken reality. The purpose of this article is to examine anachrony as a feature which exalts the dysfunctional inertia of a present life and of a traumatized mind afflicted by events which have been impossible to either register, integrate or narrate. Secondly, the article will try to unearth the mechanics of Lee’s grief and guilt via his daughter’s question. Emphasis will be placed on Lee’s inability to assume what Caruth calls the “ethical burden of survival” when asked to be his orphaned nephew’s guardian. This will be viewed as a reminder of Lee’s failure as a parent and as a challenge and invitation for the character to recover from the vacuum of his current death-in-life.


1993 ◽  
Vol 14 (1-4) ◽  
pp. 797-808 ◽  
Author(s):  
K. Weber ◽  
V. Hohler ◽  
A.J. Stilp

Transient absorption spectra have been obtained by pulsed radiolysis and flash spectroscopy of neutral and alkaline solutions of benzophenone under anaerobic conditions. These spectra demonstrate the formation of the ketyl radical ion (C 6 H 5 ) 2 Ċ—O - as a primary product resulting from electron attachment to benzophenone. In neutral solution, the rapid neutralization of the ketyl ion produces the neutral radical (C 6 H 5 ) 2 Ċ—OH, and this is shown by a change in the optical absorption spectrum. Neither of the absorption spectra due to these species is observed in acid solutions. These observations show that in neutral and alkaline solution, the hydrated electron reacts directly with the solute, whereas in acid solution it is converted to the hydrogen atom before reacting with the solute.


2021 ◽  
Author(s):  
Daniel Sheward ◽  
Anthony Cook ◽  
Chrysa Avdellidou ◽  
Marco Delbo ◽  
Bruno Cantarella ◽  
...  

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