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#Post#: 6327--------------------------------------------------
Re: Science
By: AGelbert Date: January 23, 2017, 3:58 pm
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[center][img
width=640]
HTML http://www.hermes-press.com/democ3.jpg[/img][/center]
Now if we could just get the Plutocrats to go back where they
came from, we could all party! ;D :D
[center]
HTML https://youtu.be/xmqDpuDLVYw[/center]
[center]Video: A colorful 'landing' on Pluto[/center]
January 20, 2017
HTML https://phys.org/news/2017-01-video-pluto.html
#Post#: 6600--------------------------------------------------
Re: Science
By: AGelbert Date: March 1, 2017, 7:35 pm
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[center]
HTML http://www.pic4ever.com/images/129fs238648.gif
Earth is
in a Space-Time Vortex [/center]
[center]
HTML https://youtu.be/XkAPv5s92z0[/center]
#Post#: 6663--------------------------------------------------
Re: Science
By: AGelbert Date: March 12, 2017, 6:58 pm
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This is a video about space elevators. Yeah, I know, BORING.
HTML http://www.desismileys.com/smileys/desismileys_6961.gif
But, hey. it has some valuable info about how to build stuff.
HTML http://www.pic4ever.com/images/bc3.gif<br
/>
HTML http://www.pic4ever.com/images/237.gif
Well, if that isn't enough to interest you, how about the fact
that the U.S. Government had some rather ambitious ideas about
being the top dog in the world as far back as 1894!
HTML http://www.coh2.org/images/Smileys/huhsign.gif
Ya see, the Washington Monument was the FIRST BUILDING in about
five thousand years to be taller than the tallest of the
Egyptian Pyramids ([I]except a cathedral tower that collapsed
shortly after they built it[/I]).
[center][img]
HTML http://grist.files.wordpress.com/2013/11/aaa-spill-popcorn-mean-girls.gif?w=350&h=219[/img][/center]
ENJOY and pass it on!
[img
width=150]
HTML http://www.createaforum.com/gallery/renewablerevolution/3-160614020827.gif[/img]
[center]
HTML https://youtu.be/dc8_AuzeYKE[/center]
[center] Upward Bound: Space Elevators[/center]
Isaac Arthur
Published on Mar 9, 2017
In this episode we examine the concept of a Space Elevator, a
popular piece of developing technology designed to lift people
and cargo into space at a fraction of normal launch costs. We
will look at technology as well as many of the misconceptions
about Space Elevators which have emerged.
"The physics of the space elevator", P. K. Aravind:
HTML https://pdfs.semanticscholar.org/d402...
Visit our Website:
HTML http://www.isaacarthur.net
Join the Facebook Group:
HTML https://www.facebook.com/groups/15839...
Support the Channel on Patreon:
HTML https://www.patreon.com/IsaacArthur
Visit the sub-reddit:
HTML https://www.reddit.com/r/IsaacArthur/
Listen or Download the audio of this episode from Soundcloud:
HTML https://soundcloud.com/isaac-arthur-1...
Cover Art by Jakub Grygier:
HTML https://www.artstation.com/artist/jak...
#Post#: 6726--------------------------------------------------
Re: Science
By: AGelbert Date: March 21, 2017, 4:01 pm
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[img
width=140]
HTML http://renewablerevolution.createaforum.com/gallery/renewablerevolution/3-200317134631.png[/img]
[center]Researchers create mesmerizing tornado simulation :o
algorithm [with video][/center]
[center]
HTML https://youtu.be/uLkghfvE0Rk[/center]
Article:
HTML http://www.zmescience.com/science/math/tornado-simulation-algorithm-20032017/
#Post#: 6746--------------------------------------------------
Re: Science
By: AGelbert Date: March 24, 2017, 6:59 pm
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[center]
HTML https://youtu.be/dc8_AuzeYKE[/center]
[center] Upward Bound: Space Elevators[/center]
[center][img
width=640]
HTML http://renewablerevolution.createaforum.com/gallery/renewablerevolution/3-240317195223.png[/img][/center]
[quote author=RE link=topic=559.msg127739#msg127739
date=1490397829]
That was an interesting video. I actually watched the whole
thing.
I've known about the Space Elevator concept for at least a
decade, and in principle it's plausible. The manufacturing and
engineering challenges to actually building such a thing are
incredible though, and I think his estimates of being able to
get one up in 20 years are overly optimistic.
About the only thing that surprises me is that so far Elon Musk
or Jeff Bezos hasn't done an IPO underwritten by The Squid to
get the Big Elevator Corporation (Stock Ticker code BEC) off the
ground. (pun intended) ::)
Anybody got any idea what kind of accent the narrator has is? I
never heard anyone speak English with that accent.
RE
[/quote]
HTML http://www.desismileys.com/smileys/desismileys_1730.gif
I don't know. I'll take a wild guess and say P. K. Aravind is
from India but lives in the U.K. ??? .
#Post#: 6752--------------------------------------------------
Re: Science
By: AGelbert Date: March 25, 2017, 2:13 pm
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[quote author=azozeo link=topic=559.msg127753#msg127753
date=1490406268]
[quote author=RE link=topic=559.msg127739#msg127739
date=1490397829]
That was an interesting video. I actually watched the whole
thing.
I've known about the Space Elevator concept for at least a
decade, and in principle it's plausible. The manufacturing and
engineering challenges to actually building such a thing are
incredible though, and I think his estimates of being able to
get one up in 20 years are overly optimistic.
About the only thing that surprises me is that so far Elon Musk
or Jeff Bezos hasn't done an IPO underwritten by The Squid to
get the Big Elevator Corporation (Stock Ticker code BEC) off the
ground. (pun intended) ::)
Anybody got any idea what kind of accent the narrator has is? I
never heard anyone speak English with that accent.
RE
[/quote]
He's hearing impaired. Probably about 20%. His delivery is
similar to my youngest son's. He's hearing impaired as well.
[/quote]
Thank you, AZ [img width=25
height=30]
HTML http://www.createaforum.com/gallery/renewablerevolution/3-080515182559.png[/img]
#Post#: 6755--------------------------------------------------
Re: Science
By: AGelbert Date: March 25, 2017, 8:30 pm
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Agelbert NOTE: If we manage to avoid destroying our biosphere,
perhaps we can learn to successfully terraform other planets.
[img
width=060]
HTML http://www.emofaces.com/png/200/emoticons/fingerscrossed.png[/img]
[center]
HTML https://youtu.be/ikoNQNj9ZnU[/center]
[center]
Terraforming Techniques [/center]
Isaac Arthur
Published on Oct 1, 2015
This video gives an overview of various terraforming concepts
and hurdles from those using near-horizon technologies to very
advanced and speculative tech.
#Post#: 6803--------------------------------------------------
Re: Science
By: AGelbert Date: April 2, 2017, 2:52 pm
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[img
width=140]
HTML http://renewablerevolution.createaforum.com/gallery/renewablerevolution/3-200317134631.png[/img]
[center]Why water drops splash: a non-trivial mystery
explained[/center]
James Sprittles, Assistant Professor in Mathematics, University
of Warwick
March 22, 2017
[center] [img
width=640]
HTML http://cdn.zmescience.com/wp-content/uploads/2017/03/drops-of-water-578897_1280.jpg[/img][/center]
[center]Credit: Pixabay[/center]
From the raindrops that soak you on your way to work to the
drops of coffee that inevitably end up on your white shirt when
you arrive, you’d be forgiven for thinking of drops as a mere
nuisance.
But beneath a mundane facade, droplets exhibit natural beauty
and conceal complex physics that scientists have been trying to
figure out for decades. Recently, I have contributed to this
field by working on a new theory explaining what happens to the
critical thin layer of air between a drop of water and a surface
to cause a splash.
At just a few thousandths of a second, the lifetime of a
splashing drop is too rapid for us to see. It took pioneering
advances in high-speed imaging to capture these events – the
most iconic being Edgerton’s Milk Drop Coronet in 1957. These
pictures simultaneously captured the public’s imagination with
their aesthetic nature while intriguing physicists with their
surprising complexity. The most obvious question is why, and
when, do drops splash?
Nowadays, cameras can take over a million frames per second and
resolve the fine details of a splash. However, these advances
have raised as many questions as they have answered. Most
importantly, remarkable observations, coming from the NagelLab
in 2005, showed that the air surrounding the drop plays a
critical role. By reducing the air pressure, one can prevent a
splash (see second video). In fact, drops which splash at the
bottom of Mount Everest may not do so at the top, where the air
pressure is lower.
[center]
HTML https://youtu.be/NkLm_RTR_wc[/center]
[center]
HTML https://youtu.be/_u-eNgrQOf8[/center]
[move]Ethanol drop at low pressure doesn’t splash.[/move]
The discoveries created an explosion of experimental work aimed
at uncovering the curious details of the air’s role. New
experimental methods revealed incredible dynamics:
millimetre-sized liquid drops are controlled by the behaviour of
microscopic air films that are 1,000 times smaller.
Notably, after a liquid drop contacts a solid it can be
prevented from spreading across it by a microscopically thin
layer of air that it can’t push aside. The sizes involved are
equivalent to a one-centimetre layer of air stopping a tsunami
wave spreading across a beach. When this occurs, a sheet of
liquid can fly away from the main drop and break into smaller
droplets – so that a splash is generated.
[center]
[img
width=640]
HTML https://image.freepik.com/free-vector/coffee-stains_23-2147510761.jpg[/img][/center]
[center]From a coffee stain all we can see is the outcome of
this event – a pool of liquid (the drop) surrounded by a ring of
smaller drops (the splash).[/center]
Major breakthrough
Experimental analyses have produced incredibly detailed
observations of drops splashing. But they do not establish why
the drops splash, which means we don’t understand the underlying
physics. Remarkably, for such a seemingly innocuous problem the
classical theory of fluids – used to forecast weather, design
ships and predict blood flow – is inadequate. This is because
the air layer’s height becomes comparable to the distance air
molecules travel between collisions. So for this specific
problem we need to feed in microscopic details that the
classical theory simply doesn’t account for. :o ;D
[center][img
width=400]
HTML http://renewablerevolution.createaforum.com/gallery/renewablerevolution/3-020417153858.gif[/img][/center]
[center]
How a microscopic layer of air affects water droplets.[/center]
The air’s behaviour can only be captured by a theory originally
developed for violent aerodynamic gas flows – such as for space
shuttles entering the Earth’s atmosphere – namely the kinetic
theory of gases. My new article, published in Physical Review
Letters, is the first to use kinetic theory to understand how
the air film behaves as it is displaced by a liquid spreading
over a solid.
The article establishes criteria for the maximum speed at which
a liquid can stably spread over a solid. It was already known
that for a splash to be produced, this critical speed must be
exceeded. If the speed is lower than that, the drop spreads
smoothly instead. Notably, the new theory explains why reducing
the air pressure can suppress splashing: in this case, air
escapes more easily from the layer and provides less resistance
to the liquid drop. This is the missing piece of a jigsaw to
which numerous important scientific contributions have been made
since the experimental discoveries of 2005.
Important applications
While being of fundamental scientific interest, an understanding
of the conditions that cause splashing can be exploited –
leading to potential breakthroughs in a number of practical
fields.
One example is 3D printing where liquid drops form the building
blocks of tailor-made products such as hearing aids. Here,
stopping splashing is key to making products of the desired
quality. Another important area is forensic science, where
blood-stain-pattern analysis relies on splash characteristics to
provide insight into where the blood came from – yielding vital
information in a criminal investigation.
Most promisingly, the new theory will have applications to a
wide range of related flows where microscopic layers of air
appear. For example, in climate science it will enable us to
understand how water drops collide during the formation of
clouds and to estimate the quantity of gas being dragged into
our oceans by rainfall.
Do keep this in mind the next time you splatter coffee drops
across your desk. Take a moment to admire the pattern and
appreciate the underlying complexity before cursing and heading
for your “mopper upper” of choice. ;D
James Sprittles, Assistant Professor in Mathematics, University
of Warwick
This article was originally published on [font=times new
roman]The Conversation[/font].
HTML http://www.zmescience.com/science/news-science/why-water-drop-splash/
Agelbert NOTE: So, now you know that the fellow that made the
following animation was NOT describing dripping water at high
altitude atmospheric pressure. Test on Monday.
HTML http://www.desismileys.com/smileys/desismileys_6869.gifhttp://www.pic4ever.com/images/5yjbztv.gif
[center]
HTML http://www.createaforum.com/gallery/renewablerevolution/3-021014225147.gif[/center]
#Post#: 6834--------------------------------------------------
Re: Science
By: AGelbert Date: April 6, 2017, 4:57 pm
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Is All of NASA’s Technology Classified? ???
HTML http://www.desismileys.com/smileys/desismileys_2932.gif
Not all of NASA’s technology is classified. In fact, since 2014,
the National Aeronautics and Space Administration has released
an annual software catalog, allowing the public to access and
download a variety of technical applications. The software
catalog is available free of charge, and includes software
related to aeronautics, but also business systems, data
processing and storage, and other operations. NASA is the first
U.S. government agency to offer comprehensive software for
public access. The goal of the project is to allow academics and
entrepreneurs to learn from NASA's tools.
More about NASA:
•President Dwight D. Eisenhower authorized the creation of the
National Aeronautics and Space Administration in 1958.
•A variety of animals have been sent into space by NASA,
including mice, frogs, birds, rabbits, insects, fish, guinea
pigs, monkeys, and dogs.
•STS-135, the final Space Shuttle mission, took place in July
2011 using the orbiter Atlantis.
HTML http://www.wisegeek.com/is-all-of-nasas-technology-classified.htm
#Post#: 6898--------------------------------------------------
Re: Science
By: AGelbert Date: April 18, 2017, 4:56 pm
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[center]What is Laser Cooling?
HTML http://www.coh2.org/images/Smileys/huhsign.gif[/center]
This video will introduce you with the a laser cooling lab. The
working and cooling of hot air up to absolute zero is also shown
here. :o [img width=25
height=30]
HTML http://www.createaforum.com/gallery/renewablerevolution/3-080515182559.png[/img]
HTML http://www.dnatube.com/video/29076/What-is-Laser-Cooling
Agelbert NOTE: This is a BIG deal. WHY? Because, as much as I
hate to admit it, this provides a way to escape the temperature
effects (but NOT the ocean acidification effects!) of global
warming.
This counterintuitive process gives the appearance of violating
the second law of thermodynamics because it uses laser energy to
COOL a gas or liquid.
[quote]The German scientist Rudolf Clausius laid the foundation
for the second law of thermodynamics in 1850 by examining the
relation between heat transfer and work. His formulation of the
second law, which was published in German in 1854, is known as
the Clausius statement:
[color=red]Heat can never pass from a colder to a warmer body
without some other change, connected therewith, occurring at the
same time.[/color][/quote]
HTML https://en.wikipedia.org/wiki/Second_law_of_thermodynamics
But laser cooling doesn't violate the above law, of course. ;D
So, how does it work it's magic of cooling, instead of heating,
while ADDING energy to a system? ???
A tuned set of lasers is fired at a gas or a liquid. This uses
energy. BUT the targeted gas or liquid does NOT heat up in this
case; it RADICALLY COOLS!
Temperature is, as everybody knows, just a measurement of how
fast the atoms/molecules are moving around in a given 3
dimensional space. Faster moving atomic mass is hotter while
slower is cooler. Absolute zero temperature is full atom stop
(in theory ;)).
The trick is making use of a weird property of photons which
enables them to have momentum WITHOUT mass. The photons hit the
target, transfer their momentum (but no mass) and SLOW the
molecules down, making them real cold real fast.
The casual observer will scratch his head
HTML http://www.desismileys.com/smileys/desismileys_6656.gif
and ask
WHY the momentum doesn't make some of the atoms/molecules go
faster (by hitting them from behind instead of head on), since
molecules are going in every which way all the time. ???
I mean, shouldn't it all sort of even out?
HTML http://www.desismileys.com/smileys/desismileys_1730.gif
NOPE.
THAT has to do with photon frequencies. All atoms/molecules have
absorption frequencies. A CO2 molecule will absorb high energy
photons (UV band) and emit lower energy photons (IR band) which
cannot get out of the earth's atmosphere. That's how global
warming got going.
Well, the tuned laser photons (in the video below, they mention
using six of them in GPS satellites for atomic clock cooling) do
not hit atoms/molecules going AWAY from them because their
frequency enables them to "miss" them (no photon momentum
absorption due to Doppler effect frequency difference
HTML http://www.pic4ever.com/images/34y5mvr.gif).
[quote][font=times new roman]In the process of absorbing a
photon, the atom receives a small push, a push in the direction
away from the source of light, which is the key to laser
cooling.
[/font][/quote]
HTML https://www.learner.org/courses/physics/visual/animation.html?shortname=PHY05_laser_cooling
The end result is billions of molecules slowing down and getting
real cold, real quick as a consequence of a teeny tiny amount of
laser energy injected to do the cooling. [img
width=100]
HTML http://www.pic4ever.com/images/8.gif[/img]
I hope you realize that this means we will soon have air
conditioners that use MUCH LESS ENERGY (look ma, no
compressor!). It's painfully obvious that lasers, BECAUSE they
shoot ZERO MASS photons (there ain't any other kind of photons
;D), will require much less energy to cool down a gas than
present refrigeration technology.
AND, they won't need any fancy refrigeration gas or fluid. WATER
will do quite nicely for an ICE box refrigerator or air
conditioner, thank you very much. [img
width=70]
HTML http://static.uglyhedgehog.com/upload/2012/8/14/1344970546338-awesome_mc_ht_smiley.gif[/img]
Like I said before, THIS IS BIG!
HTML http://www.createaforum.com/gallery/renewablerevolution/3-200714183515.bmp
[center]
HTML https://youtu.be/hFkiMWrA2Bc[/center]
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