Recent comments in /f/explainlikeimfive

fiendishrabbit t1_j6jnu4y wrote

European conditions and regulations favor a cabover configuration:

  1. Shorter length. European countries have stricter overall length regulations.
  2. Better overview when in dense traffic.
  3. More urbanized and older road network also favors shorter and better overview as you have a better idea where the outer corners of your truck are (good when in tight spaces).

P.S: Meanwhile a conventional truck is more aerodynamic, it's easier to access the engine and it's a smoother ride since you're behind (and not over) the forward axle. So it's a favored configuration when you have longhaulers on long open roads (like much of the US).

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aspheric_cow t1_j6jndhd wrote

Europe has a limit on the total length of the truck+trailer. So a shorter cab allows for a longer trailer. The US has a limit on the length of the trailer, but not the cab, so the cab can be as long as you want. And a longer cab allows for better aerodynamics and more room inside, which is especially important for American long-haul trucks because most drivers live in the cab.

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RusticGroundSloth t1_j6jmh5c wrote

I've got 2 semi-educated guesses on why this is.

  1. Using the chip there's a decryption process to get the data off the chip. The terminals in use aren't exactly using high-end processors, so the decryption could take a bit longer. With the contactless payment it's just exchanging a small amount of data without the encrypt/decrypt taking up time.

  2. The time it takes to contact the payment processor and get authorization. I've noticed a significant difference between a Wal-Mart and a Smith's (Kroger) in my town. Both of them don't take contactless payments so this is with the chip. The Wal-Mart takes ~10 seconds to return an authorization, but the Smith's takes about 3 seconds. Same card, even looks like the same PIN-pads on the self-checkouts. Could be faster network/Internet speeds at the store, could be differences in how they process the payments (I wouldn't be surprised if Walmart has some centralized setup to handle that rather than each store "calling" the credit card service)...hard to say, but there are a lot of variables beyond just chip vs NFC.

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konwiddak t1_j6jmd3k wrote

In any real world plant that operates via evaporation, most of the energy used to boil off the water is re captured via the heat exchangers used to condense the steam back into water. This heats the incoming water. (Most are multi stage running different parts at different temperatures/pressures.) Overall its a pretty efficient process, with reverse osmosis a bit more efficient.

However the amount of water that we use for not drinking purposes, irrigation, washing e.t.c is massive.

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firelizzard18 t1_j6jlb2e wrote

You burn calories by living. If you exercise, you burn more. If you consume zero calories you will starve because you burn 1500-2500 each day (depends on the person) by living. If you know your basal metabolic rate (how many calories you burn per day) and you eat 500 calories less than that number, you’ll lose about a pound per week.

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Envelope_Torture t1_j6jl40g wrote

Most large scale desalination is reverse osmosis, which produces a very salty brine rather than solid deposits of anything. Further processing and refining of minerals from this would also be very resource intensive as well as complex. There is a lot of research going on in this area as well.

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SelectTadpole t1_j6jkk1f wrote

Oh shit. I've used them before, then! How fun. I don't remember it sounding too bad but I wasn't really thinking about it, either. Nor did I have much of an ear for music quality at the time.

On the other hand I do remember thinking "so this is how they invented dubstep" when 80's pop was playing at the same time as the very loud machine making crazy noises.

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samuarichucknorris t1_j6jkjii wrote

What your browser barfs back is just HTML / CSS.

Unless the website is 100% client side, then no you cannot just copy the HTML source and rip off the website.

There is an entire tech stack / ecosystem behind the scenes that reacts to what data your sending back over the wire and in turn you get a response containing the HTML. Your "abstracted" away from everything that isn't in the presentation layer (source code wise).

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d4rkh0rs t1_j6jk32l wrote

I just missed the tape era(unless Sinclair and Commodore count).
My understanding was the original systems had to read each header without a good index allowing them to jump to record X.
It sounds like your systems were a bit more advanced.

I bow to your greater experiance while wishing we could hear from the 50s and 60s.

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