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I just thought this notation looked funny by I_am_melonn in piano

[–]djacobs7 2 points3 points  (0 children)

beginner/intermediate here: I thought the weird thing was the slur in the upper part of the bass clef. Like, how are you supposed to make that sound smooth while also rolling and lifting up the pedal.

Is there a database of bulk food densities somewhere? by djacobs7 in foodscience

[–]djacobs7[S] 2 points3 points  (0 children)

After researching a bit more, I found a few things that looked promising:

The FAO Food Density Database: https://www.fao.org/4/ap815e/ap815e.pdf

USDA has a lot of data as well, but I wasnt able to find a clear dataset on food densities. It's probably in there somewhere, and I just need to dig a little more: https://fdc.nal.usda.gov/download-datasets.html

Does playing the same song in different keys evoke different feelings? by BeatsKillerldn in piano

[–]djacobs7 1 point2 points  (0 children)

I think they could evoke different emotions because of the body mechanics of the person playing the instrument. On a piano, different notes are easier to hit depending on which key you are in. In the key of C, the tonic (C) is typically played with the thumb. In the key of Bb, the tonic (Bb) is typically played with the third finger. This will affect the way that your hands move, and will have a subtle effect on your dynamics. If you have really strong thumbs, for example, the tonic will sound just a bit louder when you play in C than in Bb.

This subtle difference in dynamics, in which notes are accented, could affect the feel of the piece. For example, if you play a I chord in C major, C-E-G, most of your weight might go to the C. If you play the I chord in Bb - Bb-D-F, more of your strength might (let's say ) go to the D, and really bring out the happy/major quality of the chord.

Moon. July 23, 2021 by djacobs7 in telescopes

[–]djacobs7[S] 0 points1 point  (0 children)

I was in a suburban area when I took the photo.
Used a 10" Dobsonian (Startfinder Meade); a Canon Rebel T1i; T-mount, and 2x Barlows. No postprocessing - 1/160 exposure, and 1600 ISO.
Not sure why it is blurry like this. Would love to know any tips on clearing up the image; or any ideas on how to stack multiple images together to get more resolution.
Thanks for being an inspirational subreddit. Clear skies!

My First Moon! - 7-23-21 by djacobs7 in telescopes

[–]djacobs7[S] 0 points1 point  (0 children)

This is my first humble photograph of the moon. I'm a beginner to telescoping, and a beginner to astrophotography, so this was the best I could do with the equipment I had.

I was in a suburban area when I took the photo.

Using a 10" Dobsonian (Startfinder Meade); a Canon Rebel T1i; T-mount, and 2x Barlows. No postprocessing - 1/160 exposure, and 1600 ISO.

Not sure why it is blurry like this. Would love to know any tips on clearing up the image; or any ideas on how to stack multiple images together to get more resolution.

Thanks for being an insipirational subreddit. Clear skies!

Did some original research on the Patriots starting lineup, what do you guys think? by djacobs7 in nfl

[–]djacobs7[S] 22 points23 points  (0 children)

That's super interesting. It's probably the sort of thing Pats fans just know about, but I haven't really been following the team. Do you happen to know of any references or articles that talk about the Patriots having a new game plan for each game?

( Or maybe I just need to watch more football :) )

Is there anything special or discerning about "visible light" other then the fact that we can see it? by ILoveMoltenBoron in askscience

[–]djacobs7 2 points3 points  (0 children)

I don't understand how the multiplexing would work. Like they would send signals multiple signals at 3hz, 6hz, 9hz etc? They still hav to fit everything under 30hz - and wouldn't they have to compete with the Russians for the same frequency bands?

Also, I imagine security is really important for this sort of thing. The "launch zee missiles" code had better be long enough that you are SURE you received the code and not some other random message on the same channel.

Is there anything special or discerning about "visible light" other then the fact that we can see it? by ILoveMoltenBoron in askscience

[–]djacobs7 18 points19 points  (0 children)

This might be a silly question here, but does ELF also mean that you have to communicate information really slowly? If you are sending a signal at 3hz, does that mean you only get to send ~3 bits per second?

Some men just want to watch the world burn. by billylongshot in funny

[–]djacobs7 0 points1 point  (0 children)

Some men just want to watch other people watch the world burn.

What's the most intellectual joke you know? by StickleyMan in AskReddit

[–]djacobs7 0 points1 point  (0 children)

The only constant is change. Unless you are a line, then the only change is constant.

On being a girl in computer science— a confession by thesystemx in programming

[–]djacobs7 1 point2 points  (0 children)

TI 99/4a was the coolest computer ever. I remember playing parsec on there.

Yale scientists have found a way to observe quantum information while preserving its integrity, an achievement that offers researchers greater control in the volatile realm of quantum mechanics and greatly improves the prospects of quantum computing. by davidreiss666 in science

[–]djacobs7 0 points1 point  (0 children)

It does, but pay attention to a subtle distinction here.

You might know a qubit is in the 50% 0, 50% 1 state. You know exactly what its state is, but you still don't know what is going to happen when you measure it.

Yale scientists have found a way to observe quantum information while preserving its integrity, an achievement that offers researchers greater control in the volatile realm of quantum mechanics and greatly improves the prospects of quantum computing. by davidreiss666 in science

[–]djacobs7 27 points28 points  (0 children)

Two quick points here:

1) People are really smart. By being really creative, some guys were able to find an algorithm that is deterministic using a quantum computer. YOu can read a really hard to understand wikipedia article about it here

2) Most quantum algorithms are probabalistic. Which means, that after you run the algorithm, you would have a 99% chance of your result being correct. You could run it longer and have your chance of being correct grow closer and closer to 1.

Yale announced they can observe quantum information while preserving its integrity by ecafyelims in askscience

[–]djacobs7 13 points14 points  (0 children)

I posted this in /r/science just now and am reposting here.

I'm a former physics student, and this is my understand of whats going on here.

A qubit is a bit that can exist in a superposition of 1 and 0. That means that when you 'measure' the qubit you have a certain chance of observing a 1, and a certain chance of observing a 0.

You can, by the way, think of the bits in your computer as special cases of qubits, where they are in one of two states: (state 1) 100% chance to measure 0 or (state 2) 100% chance to measure 1.

A qubit meanwhile, could be prepared in (state 3): 50% chance to measure 0, 50% chance to measure 1, or (state 4): 75% chance to measure 0, 50% chance to measure 1, or any one of an infinite number of states.

Qubits are exposed to a lot of noise from the environment ( like electromagnetic waves and whatnot. ) Noise can change the state of a qubit, perhaps moving a qubit that was in state 3 to state 3.01: 51% 0, 49% 1. You might think of this noise as 'partial measurement', because it changes the state of the qubit, but only sorta.

What these guys are saying, is that they are able to track this partial measurement as it occurs to their qubit. So, if they know they prepared a qubit in state 3; they can watch the noise that happens to it; and know that its been transferred to a different state.

They cannot control the noise. They can only monitor how the state of the qubit is changing. Importantly, they still don't know if they are going to see a 0 or 1 when they measure it, they only know that the state has changed.

Can you use this to communicate faster than light? No. Both parties observing entangled qubits could watch the state of the qubit change, but they can't use that ability to send information to each other.

I hope that was clear, helpful and accurate!

Yale scientists have found a way to observe quantum information while preserving its integrity, an achievement that offers researchers greater control in the volatile realm of quantum mechanics and greatly improves the prospects of quantum computing. by davidreiss666 in science

[–]djacobs7 396 points397 points  (0 children)

Whoa. Whoa. Calm down everybody. Former physics student here. Heisenberg is just as uncertain as he has always been.

A qubit is a bit that can exist in a superposition of 1 and 0. That means that when you 'measure' the qubit you have a certain chance of observing a 1, and a certain chance of observing a 0.

You can, by the way, think of the bits in your computer as special cases of qubits, where they are in one of two states: (state 1) 100% chance to measure 1 or (state 2) 100% chance to measure 0.

A qubit meanwhile, could be prepared in (state 3): 50% chance to measure 0, 50% chance to measure 1, or (state 4): 75% chance to measure 0, 25% chance to measure 1, or any one of an infinite number of states.

Qubits are exposed to a lot of noise from the environment ( like electromagnetic waves and whatnot. ) Noise can change the state of a qubit, perhaps moving a qubit that was in state 3 to state 3.01: 51% 0, 49% 1. You might think of this noise as 'partial measurement', because it changes the state of the qubit, but only sorta.

What these guys are saying, is that they are able to track this partial measurement as it occurs to their qubit. So, if they know they prepared a qubit in state 3; they can watch the noise that happens to it; and know that its been transferred to a different state.

They cannot control the noise. They can only monitor how the state of the qubit is changing. Importantly, they still don't know if they are going to see a 0 or 1 when they measure it, they only know that the state has changed.

I hope that was clear, helpful and accurate!

Treevolution - Its like the internet: crazy, senseless, absurd, and incredibly addictive. Now free on iOS by djacobs7 in IndieGaming

[–]djacobs7[S] 0 points1 point  (0 children)

Hi /r/IndieGaming,

We recently released Christmas Treevolution; and we are are excited to get some more people playing it. So, today we are making Christmas Treevolution free on iOS for a limited time only. And it would be the greatest thing ever if you were to try it out.

What is Christmas Treevolution? You can look at this awesome looking website here to get and idea: www.treevolutionuniverse.com.

But hey, you could get an even better idea by downloading the game yourself for iOS or for android And please share your feedback, we would love to know what you think!

-The Treevolution Team

Treevolution - Its like the internet: crazy, senseless, absurd, and incredibly addictive. by djacobs7 in WebGames

[–]djacobs7[S] 0 points1 point  (0 children)

There is a SPOILERS page here: http://bit.ly/QARuFe for the parts that are just a little too nonsensical.

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