nuccy (u/nuccy) - Readit News

nuccy commented on 62 years in the making: NYC's newest water tunnel nears the finish line ny1.com/nyc/all-boroughs/... · Posted by u/eatonphil

cogman10 · 2 months ago

It's a 60 mile long tunnel and in order for water to flow through it, you need either pumps or a downhill gradient.

I'd guess the reason for the 800 ft is because the reservoir it'll draw from is near sea level.

nuccy · 2 months ago

Rivers (e.g. Mississipi) work with much smaller gradient of just 0.01% [1], while with your assumption it would be 0.25%, so 25x.

Maybe instead it needs to pass under the rivers [2: cross-section] surrounding New-York, which may be much deeper, especially when it comes closer to the bay passing Queens and Brooklyn [2: map]

1. https://en.wikipedia.org/wiki/Mississippi_River

2. https://gordonsurbanmorphology.wordpress.com/2014/10/26/wate...

nuccy commented on Clock synchronization is a nightmare arpitbhayani.me/blogs/clo... · Posted by u/grep_it

RossBencina · 2 months ago

Out of interest, how do you measure a sub-10ps phase lock between devices 50km apart?

nuccy · 2 months ago

As of now, for testing, the two WR endpoints are sitting on the same desk with 50km fiber in a thermal chamber (simulating temperature changes in the soil), but in future they will be separated indeed.

nuccy commented on Clock synchronization is a nightmare arpitbhayani.me/blogs/clo... · Posted by u/grep_it

mgaunard · 2 months ago

Another protocol that's not mentioned is PPS and its variants, such as WhiteRabbit.

A regular pulse is emitted from a specialized high-precision device, possibly over a specialized high-precision network.

Enables picosecond accuracy (or at least sub-nano).

nuccy · 2 months ago

As a user of WhiteRabbit, I can confirm a sub-10ps sync (two clocks phase lock) over 50km fiber connection for variable temperature of fiber (biggest problem of clock sync over fibers is temperature induced length change of the fiber itself, which needs to be measured and compensated).

nuccy commented on Clock synchronization is a nightmare arpitbhayani.me/blogs/clo... · Posted by u/grep_it

shomp · 2 months ago

Absolute synchronization impossible?? Challenge accepted.

nuccy · 2 months ago

Nature (laws of physics) is agains you on this: it is in fact impossible for everyone. What is in sync for some observers can be out of sync for others (depends on where they are, i.e. gravity, and how they relatively move). See general and special relativity principle of simultaneity [1].

1. https://en.wikipedia.org/wiki/Relativity_of_simultaneity

nuccy commented on China reaches energy milestone by "breeding" uranium from thorium scmp.com/news/china/scien... · Posted by u/surprisetalk

khaki54 · 3 months ago

Interesting claim that the reactor doesn't need water and can be built away from the coast. I thought all reactors used steam to turn a turbine to produce electricity. Something special here?

nuccy · 3 months ago

Many reactors are built far away from coasts, they need water in general, but artificial lakes, or rivers are enough.

nuccy commented on AirPods libreated from Apple's ecosystem github.com/kavishdevar/li... · Posted by u/moonleay

exitb · 3 months ago

AirPods can connect to any device and perform on par with other Bluetooth headphones. This is about availability of special features which require a dedicated driver non-Apple devices are not expected to have.

nuccy · 3 months ago

Actually even within Apple ecosystem not all devices are made equal. MacBooks lack some features available for AirPods Pro on iPhones, e.g. seal check, translation, everything in the "accessibility" category: button press duration settings, single-airpod noise-cancelling, etc.

Android obviously is out of the game totally for AirPods - no spacial audio, no changes of ANC, no battery level, but at least ANC modes can be changed on AirPods directly, and button press works to answer calls, and pause/play audio, and also volume control works.

I'm three-generation Airpods Pro (around 5 years) user on Android and Macbook (no iPhone at all). In first and second generation there was a "bug" (or intentional feature) that even when connected to Android, and not being connected to my Mac, the latter was showing the charge level on both Airpods, but at some point it was removed.

In first and second generation I had an issue with one AirPod making strange noises, in both cases even Apple Support at the Genius Bar didn't know what to make out of it that I don't use AirPods with iPhone, but only with a Mac (and Android).

nuccy commented on Laptops with Stickers stickertop.art/main/... · Posted by u/z303

leipert · 3 months ago

My favourite sticker is a play on „Atomkraft? Nein danke!“ [0] (nuclear power? No thanks!) and says: „Atomzeit? Nein danke!“ (Atomic time? No thanks!)

[0]: https://en.wikipedia.org/wiki/Nuclear_Power%3F_No_Thanks

nuccy · 3 months ago

I would actually consider sticking the opposite "Nuclear power? Yes, please!" (Same for solar, wind, geothermal of course). Is there a sticker for pro-nuclear power movement?

P.S. There's a nice recent video to have a glimpse into nuclear power plant safety in action: https://youtu.be/v0afQ6w3Bjw

nuccy commented on James Webb Space Telescope reveals that most galaxies rotate clockwise smithsonianmag.com/smart-... · Posted by u/instagraham

smeej · 10 months ago

This is exactly the dumb question I came here to ask. So now I wait with you for a less dumb person to reply.

My clock certainly seems to tick in the opposite direction when I look at it from behind.

nuccy · 10 months ago

Answering to your and original question above: there are no poles (or axes of rotation) in the Universe. On large scales (think distances to include thousands and millions of galaxies each with billions of stars with even more planets) the Universe is uniform - isotropic and homogeneous [1]. It is expanding with acceleration in all direction in each and every point of its space, so there is no preferred direction thus in average we should have 50% of clockwise and 50% of counter-clockwise galaxies since orientation of those should also be absolutely random in average, unless something when the Universe was being created or evolving affected that balance.

1. https://en.wikipedia.org/wiki/Cosmological_principle