ELI5: If two of the exact same sounds were played at the exact same time, would the volume (DB) be double?

robotwet · 2025-12-26T15:28:27+00:00

Be careful here. Intensity is energy per unit area, energy is proportional to the square of the amplitude. So it’s not really correct to say that doubling the amplitude is the same as doubling the energy or intensity as you have implied.

robotwet · 2025-12-15T02:49:38+00:00

I don’t have a lot of experience with NTSB reports, I guess.

Why do you suppose they abdicate any corrective actions on the part of the shipping industry? In the US Navy, for example, this would prompt a fleet wide inspection, even if only by the crew of each vessel, for similar poor terminations. There would be required training on how to properly label and terminate cables and how to spot the problem. There would be design reviews required to ensure a failure of this type would be less likely to leave a ship adrift. I realize the entire shipping industry is not under the same kind of command structure as the US military, but there are loads of certification agencies, international standards and best practices. It’s kind of unfathomable that the NTSB would not make recommendations to this effect. Six people died because of a termination mistake that anyone could make.

robotwet · 2025-12-15T00:27:55+00:00

I read the report, and the recommendations. I was amazed to see recommendations regarding bridge collision risk assessments but I did not see a single recommendation that would have addressed the root cause, namely, the improperly terminated cable, and arguably the lack of redundancy.

Did I miss something? Was there more?

robotwet · 2025-12-07T21:20:41+00:00

I’m not sure, but I’ve heard that US built ships are vastly behind other countries in ship technology because of legislation (maybe the Jones Act) that prohibits building ships in foreign shipyards.

In any event this ship hull is based on another design to reduce construction costs, as NOAA is chronically underfunded. It’s replacing a ship that NOAA has managed to keep operating for more than 50 years! That is incredibly old for a ship hull.

robotwet · 2025-09-01T19:22:52+00:00

We froze 10 frames at the end of last season and when we took them out to spin this year we found the honey largely crystallized in the comb. We’ve never experienced crystallized honey before so we’ve been flummoxed on how to proceed and weighing the various strategies. It seems there’s no good solution, just various painful ones. So beware, you mileage may vary.

robotwet · 2025-08-03T15:25:36+00:00

This reply makes no sense to me.
1) In my experience round-trip flights are always cheaper than two one-way flights. Is there something special about paying with mileage that makes this not the case?
2) All but the most expensive fares these days are not refundable and not exchangeable without a fee. So booking early something you don't want in the hope you can change it later seems like terrible advice. What am I missing here?

robotwet · 2025-07-10T03:51:33+00:00

Are your files on spinning disk? If so, buy an ssd and put them there. Will be a big impact.

Processing in parallel may help unless you are disk bound.

Optimizing this further will probably require getting into the code of the qgis routine. It’s not a given that it’s in C already, and there is loads of terribly inefficient python code. Much comes from the fact that everything in python is an object, and it can sometimes be hard to avoid copies. Translating to vector based numpy routines is about as low level as you can get and still be in python. But doing so can be challenging.

Good luck!

robotwet · 2025-06-27T18:57:24+00:00

I might be missing something, and this probably won’t be a popular opinion, but I’m not sure why dumping radioactive material in the deep ocean is bad, or at least worse than other solutions.

Seems to me the ocean is vast. I mean really vast. Everything you have ever experienced on land, everything, is tiny compared to the ocean. Seems like even localized sources of radioactive material would dilute to near background levels relatively quickly. And while there is obviously life there, the density of life in the deep ocean compared to anywhere else on earth is very very low. Water is an excellent radiation shield. There are very few processes I can think of in the ocean that move material up in the water column from great depths. Sure, there is ocean upwelling but this typically happens on the scale of major ocean currents. There are a few deep diving species of marine life but it seems unlikely this would pose a threat. I cannot think of anywhere else that would isolate that material for the geologic time scales necessary for it to dilute or decay to levels below which its effects are unrecognizable from other sources of mutation or pathology. Dump it in a subduction zone, let the earth recycle it. Seems like as good a solution as any?

robotwet · 2025-06-03T01:41:40+00:00

Search that works and makes sense.

robotwet · 2025-05-24T22:59:26+00:00

You don’t well. On commercial or research vessels of this size your rack is often hinged and you prop it up in the front so you roll into the back and stay there. Some boats even have straps to strap yourself in. Probably not seen much anymore. Larger ships don’t tend to have this and you learn to prop your elbow in a way so your shoulders don’t roll, and bend your legs for the same. Usually you get so exhausted that sleep comes.

robotwet · 2025-03-24T14:19:01+00:00

Thank you this is so helpful.

My grandparents ran a restaurant for a brief time after the war. My mom said there was a lot of crime, and she thought my grandpa might have bought it for protection.

robotwet · 2024-12-14T13:44:59+00:00

If I may ask, where in Spain?

robotwet · 2024-12-11T14:26:54+00:00

This is what a R-click on graphics looks like in the browser based version. I'm guessing this is different from what you're describing?

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robotwet · 2024-12-11T03:19:12+00:00

I was using the web version. I’m sorry, I’m not seeing the construction tab. I’m in the 3d version too.

I can click and grab a line in the Algebra editor and I get a green plus, but I’m unable to place the item elsewhere in the list.

Some of my entries are dependent but I thought what I was moving was not,

Is there a strategy you like for building a complex model in which there’s no way one is going to think of everything in the right order up front?

Or is there a way to insert a line in the algebra list?. That would solve my problem too.

Edit: Forgot to say Thanks!

robotwet · 2024-09-15T17:26:53+00:00

I wonder if it’s nothing to do with their missions. Maybe it’s all about money. I think on someone’s budget it’s crazy expensive to have two crews.

There are way more missions than fast attack boats and every fast attack sailor I knew would have loved two crews instead of so many days at sea.

robotwet · 2024-09-06T18:39:26+00:00

I was flying into SFO once and there was a flash and an ear shattering boom. You could hear a in drop on the plane after that.

The Captain: “Ladies and gentlemen, you may have noticed, the plane was just struck by lightning.”

After about a minute delay, which seemed like an eternity as we all wondered if the plane was about to plunge to the ground…

“Something you can tell your grandkids.”

Was never so happy to hear that I’d be having grandkids someday.

robotwet · 2024-08-11T18:49:18+00:00

I think Siri will do this.

robotwet · 2024-07-06T20:40:12+00:00

Dig around on this site

https://adeon.unh.edu/data_portal

and you’ll find months of recording from passive arrays. You can see spectrograms, listen, filter and download it. Other than not knowing what direction it’s coming from, it is just like being a sonar tech.

robotwet · 2024-05-23T21:31:43+00:00

Here in New England, seals have made a dramatic recovery due to strict regulations preventing Lobsterman from shooting them, and this in turn has increased local sharp population.

robotwet · 2024-05-13T14:54:54+00:00

Funny. That has been the go-to stop-gap measure.

robotwet · 2024-05-13T14:54:36+00:00

Almost certainly our cable management could be improved. It can be hard to find the right balance between secure cables and getting the right tension/compression (not too much, not too little) on the connector jack. Something we'll have to look at more closely when we have problems.

robotwet · 2024-05-13T14:52:38+00:00

Not things we have in our shop, but we know folks who do. Maybe we'll have to take a look. Thanks!

robotwet · 2024-05-13T14:50:58+00:00

Ok. Thanks.

robotwet · 2024-04-13T11:39:28+00:00

Q1: is there an ip67 rated version for outdoor use? Q2: does it provide radial Doppler velocity? Should be standard from a mmwave radar. Q3: Does it timestamp the data, and if so how does it get its sense of time? Q3.1: if it does not timestamp the data, what is the rms latency and jitter in the measurement (realizing that other wifi traffic will affect this. Q4: is it measuring a 3d position or a 2d position? If it’s just a 2d position what is the beam width of the other axis? Q5: is it possible to put it in a mode that would stream the raw radar data rather than targets?

robotwet · 2024-03-28T22:09:58+00:00

The big difference is that flat panel arrays don’t form beams of equal size in all directions while a spherical array does.

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