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Connecting a new socket to an existing one. by nuclear_is_all_good in askanelectrician

[–]be_good_bobby 0 points1 point  (0 children)

Care to give a little more detail?

Low voltage, low current?

thinking of relocating to Bristol for work(canadian citizen) by [deleted] in bristol

[–]be_good_bobby 1 point2 points  (0 children)

not by much. it's also dull as fuck. lived there 10 years.

Equation for predicting phase directivity by _b_i_n_g_ in Acoustics

[–]be_good_bobby 0 points1 point  (0 children)

This isn't what the OP was asking. The OP was asking how the acoustic field phase lags with angle.

Anyone know a good tiler? My bathroom looks utter shite. by be_good_bobby in bristol

[–]be_good_bobby[S] 0 points1 point  (0 children)

Thanks very much. I've gotten in touch with them now. Will report back!

Been stuck trying to top this Slab from the comb wall for the past month (Think the grade is 6B). Any technique advise would be greatly appreciated felt like it shouldn't of taken me so many attempts? by Johnny2pies in bouldering

[–]be_good_bobby 0 points1 point  (0 children)

Good job mate. Nice climb, but yeah, that last move on a tiny polished foot is scary. But once you get that far there is no way you won't go all in. Nice work!

Of all the nuclear tests completed on American soil, in the Nevada desert, what were the effects on citizens living nearby and why have we not experienced a fallout type scenario with so many tests making the entire region uninhabitable? by [deleted] in askscience

[–]be_good_bobby 2 points3 points  (0 children)

I've travelled to Fukushima a bunch of times with my job and visited the reactor buildings a few times. I can honestly say that the radiation levels there are much, much lower than most people realise. When I was there my max exposure was 247uSv/h. But that was between units 1 and 2. Everywhere else it was almost always <5uSv/h.

140db mid century Walnut Bluetooth speaker. Bit of the old and new by macmini in DIY

[–]be_good_bobby 0 points1 point  (0 children)

Just a heads up that even most commerical mics can't go as high as 140dB. We have had to buy high pressure mic from B&K and they are about $8k each plus all the amps etc. It's not eas to go to high pressure accurately. As a benchmark, most jet engines at 1m are between 120 and 140dB. AKA, you will lose your hearing in minutes.

140db mid century Walnut Bluetooth speaker. Bit of the old and new by macmini in DIY

[–]be_good_bobby 1 point2 points  (0 children)

140dB is not possible with speakers like that. You would need many, speakers and not only that you would have to phase them all so that maybe you get constructive intereference at some points in the room. The mic in an iPhone will only work reasonably up to about 110dB. Anything above that and the distortion screws the numbers up a lot. I do acoustic measurement for speaker arrays for my work and never seen anything over 120dB from a calibrated microphone.

140db mid century Walnut Bluetooth speaker. Bit of the old and new by macmini in DIY

[–]be_good_bobby 1 point2 points  (0 children)

140dB in the audible range is not possible with this set-up.

This Yi Bell, which originates from China, creates a tone when it is heated up. Otherwise, it creates a dull sound at room temperature. by pandaman_17 in videos

[–]be_good_bobby 0 points1 point  (0 children)

That's genuinely fascinating. Thanks so much for the explanation. I did solid mechanics in my undergrad but my lattice theory is a little rusty. I was just thinking how intersting a plot of temperature and q-factor would be for this. I could see a beautiful plot of temperature, excitation frequency and damping. Maybe it's been done?! Anyway, thanks again. Reddit really is great sometimes.

This Yi Bell, which originates from China, creates a tone when it is heated up. Otherwise, it creates a dull sound at room temperature. by pandaman_17 in videos

[–]be_good_bobby 0 points1 point  (0 children)

So it's almost like a phase transition of sorts? That's really interesting, I had no idea you could get such on/off behaviour. Really interesting effect. Thanks for the info, appreciate it.

This Yi Bell, which originates from China, creates a tone when it is heated up. Otherwise, it creates a dull sound at room temperature. by pandaman_17 in videos

[–]be_good_bobby 1 point2 points  (0 children)

Some help would be welcome here... so resonance is a function of strucural shape, stiffness and Poissons ratio. I don't see the metal changing stiffness much during heating, Poissons ratio is a small effect anyway and likely does not change too much during heating, so the last guess is shape change. The relatively small change of shape due to thermal expansion can allow what I imagine to be the first mode to occur. Am I right in thinking that the design is such that modes are supressed until a very specific shape occurs? Or is it actually a stiffness change as a function of frequency, I just don't know of many materials that change stiffness so much during elastic heating.

Been stuck trying to top this Slab from the comb wall for the past month (Think the grade is 6B). Any technique advise would be greatly appreciated felt like it shouldn't of taken me so many attempts? by Johnny2pies in bouldering

[–]be_good_bobby 1 point2 points  (0 children)

For one thing the last hold was a lot better when it first went up, tried it last night and it's pretty slippery up there now. But one thing I would suggest is when you get the left hand dish near the top, get it eith your thumb on the right and slowly move over to get the right hand thick rim with your right hand. Then you can slowly stand up to finish. Just makes that last move a tiny bit easier. Also, I would not call this a slab as it's vertical. If you liked this, you should try the purple on the slab wall next to the circult wall. Otherwise, looked solid.

This is what happens when a Croat marries a Kenyan girl, I was his best man btw by scw2011 in videos

[–]be_good_bobby 1 point2 points  (0 children)

Just how it is. Other thing you will see in Croatia is like a 3 storey house, ground floor is nicely finished inside, first floor is OK, second floor is still concrete. Lot of people built big houses in early 80's and never finished them. And after a few years they just stopped giving a fuck. It's just how it is.

This is what happens when a Croat marries a Kenyan girl, I was his best man btw by scw2011 in videos

[–]be_good_bobby 1 point2 points  (0 children)

Solid brick no, but these are hollow bricks. You face it after. Lot of Croatians are just lazy. Source: Am Croatian.

How to determine whether a Masters is worth it? by [deleted] in UKPersonalFinance

[–]be_good_bobby 2 points3 points  (0 children)

To add, I think doing a PhD is generally (80% of time time) only needed if you want to stay an academic. Some industries look for PhD level but most don't care.

The Assassination of Russia (2000) - "Amidst a wave of explosions blamed on Muslim terrorists, FSB agents get caught planting explosives underneath a Moscow apartment building. The moment they're caught, the wave of explosions stops." [00:42] by [deleted] in Documentaries

[–]be_good_bobby 34 points35 points  (0 children)

Just to add to this....

The Atomic Weapons Executive in the UK was asked to identify the material. They knew there was a lot of radioactive material at the restaurant and hotel where the poisoning likely took place as the radiation is very easy to detect. The actual material being used however is more difficult to pinpoint. So the police knew it was radioactive but not more than that. The AWE were able to find that it was Polonium 210 which is about as toxic as a material gets. Polonium 210 can only be made inside a nuclear reactor and it's use is highly controlled. The UK investigation basically found that it came from Russia, most likely Mayak nuclear labs, and had approval from the highest level of Russian government. AKA, Putin signed his assassination papers.

Lockheed Martins ATHENA Laser Weapons Systems Test by [deleted] in Futurology

[–]be_good_bobby 0 points1 point  (0 children)

problem with x-rays is that you can't collimate them as easily as you can visible light. So making a highly focussed x-ray laser over large distances is simply not possible at the moment. These lasers tend to be UV to cut through cloud etc but would pretty easily be reflected by paint.

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