Burning spot

Brenn-fieck, m. focus burned spot, -gas, n. combustible gas, fuel gas. -gerste, /. distilling barley, -geschwindigkeit, /. velocity of combustion or of burning or of distillation. 

Fig. 2. 245 -nm excited resonance Raman spectrum of (A) 0.225 mM Craq002 + and (B) 50 pM Craq1801802 + in 0.02 M HC104 at 0°C. Negative peaks arise from subtraction of the intense 4 bands at 934 and 629 cm-1. The asterisk indicates a burned spot on the intensifier of the diode-array detector. Reproduced with permission from J. Am. Chem. Soc. 1995, 117, 6483-6488. Copyright 1995 American Chemical Society. 

The aerosols emitted during biomass burning can travel long distances. Figure 3 2 shows a three-dimensional trajectory analysis for aerosol emissions during the dry season (Freitas et al. 1997). From each biomass burning spot, the air masses that transport the aerosol particles and trace gases stay at... 

Fig. 3.2 Three dimensional forward air mass trajectories starting from biomass burning spots on August 22, 1985, during the SCAR-B experiment. Shades of gray indicate elevation in meters.

Fig. 65. Burning spots resulting from a diffuse (a) and a concentrated spark discharge (b) for the case of low-alloyed steel samples. (Reprinted with permission from Ref. [212].)...

Fig. 73. Electron microprobe (EPMA) line time 5 min gas flow 210 mL/min at 530 Pa scans (x-ray intensity in arbitrary units, versus argon pressure, burning voltage 1 kV current beam location) of burning spots of jet-assisted 58 mA. The scanned line is highlighted in Crimm-type glow discharge, (a) 0.5 mm jets white in the left-hand photograph. (Reprinted and (b) 0.2 mm jets sample brass sputtering with permission from Ref. [238].)...

Ac arcs have an alternating polarity at the electrodes. To reignite the arc an hf discharge is often used, which is superimposed onto the ac discharge gap. Because thermal effects are lower and the burning spot changes more frequently in the ac arc, the reproducibility is better than in the case of dc arcs. Here RSDs of the order of 5-10% may be obtained. 

With sufficiently high field strengths the "hot spots" become burn spots on the gel (19 > 31). This is an undesirable effect, especially when the proteln(s) of Interest has yet to be resolved. The problem can be solved by adjusting one of the electrodes (after a prescribed time into the run) to bypass the area of the gel where the conductivity gap exists. There then will be a shorter inter-electrode wick distance, a more uniform conductance across the gel, no gel burning, and the run can be completed to obtain the desired resolution. This approach has been successfully used for subtyping Go in bloodstains (31). 

In the estimation of the dissociation excimer laser flux, we assume that the mildly focused laser beam has a Gaussian beam profile [121]. The photodissociation laser spot size has also been checked by examining the burn spots on thermal papers at various distances from the focusing lens. The variation of the laser beam spot size with distance from the focusing lens is consistent with that predicted by the Gaussian beam profile. In the photodissociation region the ionization laser beam spot is smaller than the photodissociation laser beam spot. 

Brown spots, dark spots (come off), burned spots... 

Figure 28. Burning spots obtained with a glow discharge (A) and a medium-voltage spark (B)...

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