Science in the News

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Re: Science in the News

Post by gaining_age » Thu Nov 30, 2017 9:14 pm

Rusty wrote:
Thu Nov 30, 2017 8:22 pm
infidel wrote:
Thu Nov 30, 2017 3:10 pm
...That doesn’t mean that time was running backwards. But what the scientists saw happen between the two particles over time was the opposite of what you or I can expect in our ordinary lives...
Clickbait.
Nope, doesn't appear to be clickbait. Probably ends up in quantum computing. These are Qubits violating the 2nd law at will apparently and they're not entangled but their spin is correlated, I think. The second law presumes uncorrelated components in the system so what do you call this? It's real even if the exotic interpretation seems a little strained. But how do you define the arrow of time (think of it as evolution in time LOL!)? They think they can do this with larger systems as well.

Their paper is quite real - https://arxiv.org/abs/1711.03323

Ugh-- the PBS (first link) was mind numbingly confusing with imprecise declarations. It was mixing and matching concepts.

The journal article has a better intro paragraph to sort out what is of interest:
Irreversibility is a longstanding puzzle in physics.
While microscopic laws of motion are invariant under
time reversal, all macroscopic phenomena have a preferred
direction in time [1, 2]. Heat, for instance, spontaneously
flows from hot to cold. Eddington has called this
asymmetry the arrow of time [3]. At the phenomenological
level, the second law of thermodynamics allows one
to predict which processes are possible in nature: only
those with non-negative mean entropy production do occur
[4]. A microscopic resolution of the apparent paradox
of irreversibility was put forward by Boltzmann, when he
noted that initial conditions break the time-reversal symmetry
of the otherwise reversible dynamics [5]
"Microscopic laws of motion are invariant under time reversal"--- the fundamental physics relations don't have an arrow to them. Backwards and forwards doesn't matter-- what is source and what is detector with optics? The wave equations and boundary conditions don't care which way time flows (as an example). We choose time moving forwards since that is what we observe in our macroscopic world.

Aha! Now we come to the paper point of interest-- the conundrum-- the puzzle stated at the beginning: Where does irreversability (at macroscopic level) come from? In the experiment they keep to the microscopic level to check out a macroscopic phenomena (entropy/heat flow) and observe that it doesn't follow macroscopic tendencies. Why? Because we're still at the microscopic level.

It's an interesting puzzle and information but this is not truly about time direction change (at a macroscopic level). It's microscopic where solutions exist for both positive and negative time--- but what they have is aligned correlation of the quantum properties with statistical (thermodynamic) properties to observe heat flow (macroscopic phenomena) go differently than what we observe with true/normal macroscopic observations.

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Re: Science in the News

Post by Rusty » Wed Dec 20, 2017 1:12 pm

Rainer Weiss, now Nobel laureate 2017 for the detection of Gravitational waves, presents the 100 year history. Really a good presentation that perhaps nobody else has even attempted. This is immediately after the first BH merge announcement in Feb. last year. He's 83 yo here so it's esp. impressive. There is some Maths but he explains it well enough that it shouldn't detract from understanding. This doesn't appear to be a well rehearsed presentation. It's more like stream of consciousness. Must see.

https://www.youtube.com/watch?v=anniqdS-uUU
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Re: Science in the News

Post by wosbald » Fri Dec 22, 2017 5:19 pm

+JMJ+

Pope Francis needs a microscope to eye Lithuanian crib
Image
In this image made available by LinkMenu fabrikas on Friday Dec. 22, 2017 shows the minuscule nativity scene that was given to Pope Francis. Lithuania has given Pope Francis a Christmas present invisible to the naked eye: a Nativity scene where baby Jesus is smaller than a human cell. It took three months for Lithuanian scientists and students to create the minuscule crib from a 3D scan of the life-size crèche, reducing it 10,000 times. (Credit: LinkMenu fabrikas via AP.)

VILNIUS, Lithuania - Lithuania has given Pope Francis a Christmas present invisible to the naked eye: a Nativity scene where baby Jesus is smaller than a human cell.

Lithuanian President Dalia Grybauskaite on Friday looked through a microscope to see a replica of the crib at Vilnius’s downtown Cathedral Square, a copy of the nativity scene that was given to Francis by Lithuanian diplomats earlier this month.

She said it took three months for Lithuanian scientists and students to create the minuscule crib from a 3D scan of the life-size crèche, reducing it 10,000 times.

[…]




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Re: Science in the News

Post by infidel » Wed Jan 03, 2018 2:37 pm

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Re: Science in the News

Post by Skip » Wed Jan 03, 2018 3:03 pm

+3.14 for the reference; I haven't even looked at the article.
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Re: Science in the News

Post by UncleBob » Tue Jan 09, 2018 8:37 am

Scientists Just Found Proof of a Fourth Dimension
What is the fourth dimension?

It depends on who you talk to—some people think it's the dimension of time, like in Donnie Darko. Others think it's another dimension of space, like the designer of the game Miegakure.

No one's quite sure—the fourth dimension mystifies even scientists like Micho Kaku, who said he felt like Alice in Wonderland after reading up on it. However, two new studies published in Nature have started to give a better picture of the fourth dimension.
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Re: Science in the News

Post by gaining_age » Tue Jan 09, 2018 8:49 am

UncleBob wrote:
Tue Jan 09, 2018 8:37 am
Scientists Just Found Proof of a Fourth Dimension
What is the fourth dimension?

It depends on who you talk to—some people think it's the dimension of time, like in Donnie Darko. Others think it's another dimension of space, like the designer of the game Miegakure.

No one's quite sure—the fourth dimension mystifies even scientists like Micho Kaku, who said he felt like Alice in Wonderland after reading up on it. However, two new studies published in Nature have started to give a better picture of the fourth dimension.
They sure complicated the Hall effect. Essentially, electrons flowing (a current/charged particle moving) in one direction along a wire has the wire placed in a magnetic field. The moving charge in the electric field causes it to move perpendicular to the magnetic field -- horizontal in the wire. This will cause the charges to build on one side and be depleted from the other thus having a voltage difference between the sides of the wire. The wire is usually in a diagram as a bar:

Image


The better question (after sorting out their odd description of the Hall effect) is to ask how are they imagining a 4th dimension and how is that having an affect in the 3rd related to the Hall effect?

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Re: Science in the News

Post by UncleBob » Wed Jan 10, 2018 9:36 am

Extraterrestrial Stone Found In Egypt Contains Compounds Not Found Elsewhere In The Solar System

Image
The Hypatia stone found in Egypt contains compounds not found elsewhere on Earth and even the Solar System. Analysis revealed it also contains minerals that appear to be older than the Sun. ( Dr. Mario di Martino | INAF Osservatorio Astrofysico di Torino )
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Re: Science in the News

Post by gaining_age » Wed Jan 10, 2018 4:24 pm

UncleBob wrote:
Wed Jan 10, 2018 9:36 am
Extraterrestrial Stone Found In Egypt Contains Compounds Not Found Elsewhere In The Solar System

Image
The Hypatia stone found in Egypt contains compounds not found elsewhere on Earth and even the Solar System. Analysis revealed it also contains minerals that appear to be older than the Sun. ( Dr. Mario di Martino | INAF Osservatorio Astrofysico di Torino )
You missed a key quote:
The findings challenge the models of a planetary formation that posit materials were evenly scattered throughout the protoplanetary disc. Kramers said that if the stone did not predate the Sun, its features indicate that the solar nebula was not homogenous, questioning the generally accepted idea of how the Solar System formed.

I.e.-- revisit your assumptions when the data tells a different story.
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Re: Science in the News

Post by tuttle » Thu Jan 11, 2018 7:31 am

gaining_age wrote:
Wed Jan 10, 2018 4:24 pm
UncleBob wrote:
Wed Jan 10, 2018 9:36 am
Extraterrestrial Stone Found In Egypt Contains Compounds Not Found Elsewhere In The Solar System

Image
The Hypatia stone found in Egypt contains compounds not found elsewhere on Earth and even the Solar System. Analysis revealed it also contains minerals that appear to be older than the Sun. ( Dr. Mario di Martino | INAF Osservatorio Astrofysico di Torino )
You missed a key quote:
The findings challenge the models of a planetary formation that posit materials were evenly scattered throughout the protoplanetary disc. Kramers said that if the stone did not predate the Sun, its features indicate that the solar nebula was not homogenous, questioning the generally accepted idea of how the Solar System formed.

I.e.-- revisit your assumptions when the data tells a different story.
This is probably all the confirmation the "Pyramids were built by aliens" people need.
Image

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Re: Science in the News

Post by UncleBob » Mon Jan 15, 2018 10:56 am

"One man's theology is another man's belly laugh." - Robert A. Heinlein

"Many of the points here, taken to their logical conclusions, don't hold up to logic; they're simply Godded-up ways of saying "I don't like that." - Skip

"You guys are weird." - Mrs. FredS

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Re: Science in the News

Post by UncleBob » Wed Jan 24, 2018 3:51 pm

"One man's theology is another man's belly laugh." - Robert A. Heinlein

"Many of the points here, taken to their logical conclusions, don't hold up to logic; they're simply Godded-up ways of saying "I don't like that." - Skip

"You guys are weird." - Mrs. FredS

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Re: Science in the News

Post by UncleBob » Tue Feb 06, 2018 9:41 am

"One man's theology is another man's belly laugh." - Robert A. Heinlein

"Many of the points here, taken to their logical conclusions, don't hold up to logic; they're simply Godded-up ways of saying "I don't like that." - Skip

"You guys are weird." - Mrs. FredS

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Re: Science in the News

Post by wosbald » Tue Feb 06, 2018 10:19 am

+JMJ+

Enzyme Designed Entirely From Scratch Opens a World of Biological Possibility
Image

[…]

Donnelly was looking at the first artificial enzyme. An artificial protein that, by all accounts, should not be able to play nice with the intricate web of biochemical components and reactions that support life.

Yet when given to a mutant bacteria that lacks the ability to metabolize iron, the enzyme Syn-F4 filled in the blank. It kickstarted the bacteria’s iron processing pathways, naturally replacing the organism’s missing catalyzer—even though it was like nothing seen in life.

“That was an incredible and unbelievable moment for me—unbelievable to the point that I didn’t want to say anything until I had repeated it several times,” says Donnelly, who published her results in Nature Chemical Biology.

The big picture? We are no longer bound by the chemical rules of nature. In a matter of months, scientists can engineer biological catalysts that normally take millions of years to evolve and fine-tune.

And with brand new enzymes comes the possibility of brand new life.

[…]




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Re: Science in the News

Post by infidel » Tue Feb 06, 2018 10:38 am

wosbald wrote:
Tue Feb 06, 2018 10:19 am
+JMJ+

Enzyme Designed Entirely From Scratch Opens a World of Biological Possibility
The big picture? We are no longer bound by the chemical rules of nature. In a matter of months, scientists can engineer biological catalysts that normally take millions of years to evolve and fine-tune.

And with brand new enzymes comes the possibility of brand new life.

[…]
I've seen this movie. It doesn't end well.
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Re: Science in the News

Post by UncleBob » Fri Feb 09, 2018 10:21 am

"One man's theology is another man's belly laugh." - Robert A. Heinlein

"Many of the points here, taken to their logical conclusions, don't hold up to logic; they're simply Godded-up ways of saying "I don't like that." - Skip

"You guys are weird." - Mrs. FredS

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Re: Science in the News

Post by Del » Fri Feb 09, 2018 12:06 pm

infidel wrote:
Tue Feb 06, 2018 10:38 am
wosbald wrote:
Tue Feb 06, 2018 10:19 am
+JMJ+

Enzyme Designed Entirely From Scratch Opens a World of Biological Possibility
The big picture? We are no longer bound by the chemical rules of nature. In a matter of months, scientists can engineer biological catalysts that normally take millions of years to evolve and fine-tune.

And with brand new enzymes comes the possibility of brand new life.

[…]
I've seen this movie. It doesn't end well.
Life finds a way.... and it's scary.
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Re: Science in the News

Post by gaining_age » Fri Feb 09, 2018 5:46 pm

Del wrote:
Fri Feb 09, 2018 12:06 pm
infidel wrote:
Tue Feb 06, 2018 10:38 am
wosbald wrote:
Tue Feb 06, 2018 10:19 am
+JMJ+

Enzyme Designed Entirely From Scratch Opens a World of Biological Possibility
The big picture? We are no longer bound by the chemical rules of nature. In a matter of months, scientists can engineer biological catalysts that normally take millions of years to evolve and fine-tune.

And with brand new enzymes comes the possibility of brand new life.

[…]
I've seen this movie. It doesn't end well.
Life finds a way.... and it's scary.
Was it a Crosby/ArtGuy recommended movie? </shivers>
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Re: Science in the News

Post by StoicDetective » Sat Feb 10, 2018 8:53 am

infidel wrote:
wosbald wrote:
Tue Feb 06, 2018 10:19 am
+JMJ+

Enzyme Designed Entirely From Scratch Opens a World of Biological Possibility
The big picture? We are no longer bound by the chemical rules of nature. In a matter of months, scientists can engineer biological catalysts that normally take millions of years to evolve and fine-tune.

And with brand new enzymes comes the possibility of brand new life.

[…]
I've seen this movie. It doesn't end well.
Wasn't that movie called Resident Evil, ... oh wait that was a virus. Nevermind, we're good. I can't see this enzyme thing going wrong, please continue production.

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