Recent content by Gruxg

You are not alone in this feeling. The clinical job does not have too much physics actually. I don't know in Canada, but in most European countries it is currently more like a mixture of project manager and quality engineer (and dosimetrist, if you are in the radiotherapy field). The physics we...

I thought any type of thermal power sation required a powerful cooling system and therefore had to be located near a large water mass (river, sea) or have big cooling towers: I have seen this in nuclear, gas or biomass stations. However, I haven't seen it in concentrated solar power stations...

Thanks for replying. This is interesting. The Fukushima reactors were not PWR, but is the system you describe similar to this one mentioned in wikipedia?: "Units 2 and 3 had steam turbine-driven emergency core cooling systems that could be directly operated by steam produced by decay heat...

Hi, a layman's doubt out of curiosity: If I am correct, after a reactor is shut down, it keeps heating because of the high activity, it is necessary to extract the heat to avoid damages and this needs electricity. I think the nuclear plants have emergency diesel generators in case they get...

The link you quote explains what a sound wave is, not how the lead front decays to a sound wave.

Interesting, but I do not understand it. Could you elaborate a little or give any link to a more elaborated explanation? Thanks!

But in a sound wave we have a periodic oscillation or vibration: the source of the sound moves back and forth. In an explosion and in my example of the tube with the piston is not obvious that the same happens. The piston does not move back and forth, only moves in one direction for a short...

But is the propelling over-pressure gone so quickly? Let's think in a similar but simpler system: a cylinder with air, open in one end, and with a piston in the other. The piston suddenly moves and stops, producing a pressure wave in the air inside the tube. Would we have a negative pressure too...

In the blast wave generated by an explosion, after a first violent increase in the air pressure, there is a "negative phase" in which the pressure drops below the initial atmospheric pressure (see e.g. https://en.wikipedia.org/wiki/Blast_wave ). According to wikipedia, this underpressure is the...

I answer myself. Now I see that such a file represents something similar to a point of the phase space of a system composed by many particles.

In the field of medical physics, specifically in monte carlo simulation of radiation beams produced by electron accelerators, people call ‘phase space’ to a file that contains the data of a large number of particles when they traverse a reference surface in the machine (usually a plane), i.e...

There are some youtube videos showing the formation of a vertical arc in those conditions: How can it be explained with Biggin's theory? Or am I missunderstanding something?

----- I don'tt have academic responsabilities for the moment, but some of my mates do have.

------------ Oops! I don't know what happened, I wanted to reply to Choppy but my response is not displayed as I expected, it seems as if write a Choppy's paragrah and the isn't any break between his words an mine. Sorry!

400 patients/year with 2 linear accelerators, wow, what a luxury! Is it more or less the normal ratio in north america? In my country the typical ratio is about 400 patients/year per linac. In my hospital even more: we have 2 linacs and we treat about 900-1000 patients/year (the health...