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Orion Lawlor
Registrace 28. 05. 2006
Dr. Orion Lawlor builds robots, 3D printers, graphics software, and other strange things in Fairbanks, Alaska. He also teaches at the University of Alaska Fairbanks Computer Science department.
Under a freezing Alaska creek
Oddly rounded anchor ice appears underwater in our Alaska creek as it freezes up for winter.
During the summer, the creek is a little silty and has a rocky bottom. During most of the winter, the water runs fully under the ice. It's a rather late freezeup this fall, so we got a chance to collect some video under the water as it freezes.
I was very surprised that the ice forms those weird rounded shapes! They're rather fragile and stained dark with silt, but they look a more like clouds or snow than the jagged ice or rippled sand I'd expect. The first few seconds are just downstream of our bridge where the ice is building up on a fallen log, the end clip is another area of the creek just upstream of my shop with broadly similar ice shapes.
There are a few fish, marten, and the occasional river otter in the creek, but we haven't seen any tracks around these areas in the past few weeks.
The little action camera I used has no microphone, so I recorded the creek separately, and did a graphical equalization to boost the bass and drop the treble to match the underwater segments--created in Audacity and Kdenlive, not the original sound!
During the summer, the creek is a little silty and has a rocky bottom. During most of the winter, the water runs fully under the ice. It's a rather late freezeup this fall, so we got a chance to collect some video under the water as it freezes.
I was very surprised that the ice forms those weird rounded shapes! They're rather fragile and stained dark with silt, but they look a more like clouds or snow than the jagged ice or rippled sand I'd expect. The first few seconds are just downstream of our bridge where the ice is building up on a fallen log, the end clip is another area of the creek just upstream of my shop with broadly similar ice shapes.
There are a few fish, marten, and the occasional river otter in the creek, but we haven't seen any tracks around these areas in the past few weeks.
The little action camera I used has no microphone, so I recorded the creek separately, and did a graphical equalization to boost the bass and drop the treble to match the underwater segments--created in Audacity and Kdenlive, not the original sound!
zhlédnutí: 210
Video
Mining Robot Durability Demonstration Summary Timelapse: Aurora Robotics
zhlédnutí 284Před 11 měsíci
An overview of our mining robot's long term performance, with timelapses of it excavating and hauling during our 15-day durability demonstration for the NASA Break The Ice lunar permafrost mining challenge. The excavation timelapses are shown at 20x actual speed, and the hauling timelapses are shown at 40x actual speed. We generally mined 10-20 kilograms of material before hauling it 500 meters...
Lunar Permafrost Mining Robot Prototype Demo
zhlédnutí 290Před rokem
Our mining robot doing some mining and hauling, demonstrating a complete cycle. We've been developing this for the Break The Ice lunar permafrost mining challenge since late 2020, and we hope to demonstrate a fully autonomous mining system in summer 2023 for the challenge Phase 2. Our summer 2023 livestream of this robot mining lunar permafrost simulant: czcams.com/users/liveD-ZfnQy_gGk Our Pha...
All the moose are on my driveway...
zhlédnutí 187Před 2 lety
At least seven(!) moose standing around my driveway this morning. I stopped to wait for the group of three on the road, noticed three more on my left, and then noticed at least one more on the right! (Might be two on the right, there were two earlier.) It's a high snow year, and the driveway is the only plowed place nearby, so the moose use it like a highway. I needed to get to work so I cautio...
Aurora Robotics - Lunar Mission Animation
zhlédnutí 510Před 3 lety
Our robotic excavation architecture is based around a lightweight multipurpose robot using a reciprocating rock breaker, derived from a commercial impact hammer tool, which allows our robot to break up and excavate hard icy regolith at a reasonable rate. Updated: See our summer 2023 livestream of this robot mining lunar permafrost simulant: czcams.com/users/liveD-ZfnQy_gGk Our Phase 2 operation...
Aurora Robotics - Team Video Pitch
zhlédnutí 213Před 3 lety
This is a short background video on our robotics team and how we work and why we're building lunar mining robots in Alaska! This is for the NASA Break The Ice Lunar Challenge, which seeks innovative ways to get water out of the moon. (I forgot to mention: we also have a rocket range, Poker Flat, and build satellites in the Space Systems Development Lab!) By Aurora Robotics, College of Engineeri...
Aurora Borealis Tonight! Bright and *Fast*!
zhlédnutí 83Před 3 lety
These exposures are less than 1 second each, spaced 3 seconds apart, and the aurora is whipping across the sky faster than it can follow. It's also very bright, bright enough you can see it over the sunset light! Footage taken tonight over Fairbanks, Alaska.
Using Persistence of Vision in Circuits
zhlédnutí 166Před 3 lety
How and why we might use persistence of vision to save microcontroller I/O pins, while still allowing big displays. The circuit diagram near the end is a 4-digit 7-segment common cathode display, like the 5461AS. The clip at the end of a bicycle LED display using persistence of vision is an old creative commons clip from here: czcams.com/video/ts_JT9LUovA/video.html That exact display doesn't a...
Potentiometer Intro
zhlédnutí 146Před 3 lety
Demonstrating a potentiometer, which functions like two adjustable resistors in series. The Arduino code is very simple: void setup() { Serial.begin(9600); } void loop() { int v=analogRead(A0); // raw 0..1023 Serial.println(v); delay(100); } I'm showing that code in the excellent Tinkercad Circuit simulator: www.tinkercad.com/things/iy3FwcUgxae-potentiometer-as-voltage-divider-2 Near the end I ...
Simple circuits and simulator in Tinkercad
zhlédnutí 263Před 3 lety
Matching up real physical circuits with simulated virtual circuits in Tinkercad. You'll need to sign up for Tinkercad, but it's completely free, and the Arduino / circuit simulator is the best I've seen! The simple circuit above is at: www.tinkercad.com/things/cxGVGgelKIE
Intro to Simple DC Circuits
zhlédnutí 133Před 3 lety
The simplest DC circuits: a small battery powering an LED, or a small DC motor. Shows both the physical components, the circuit diagram, and simulations showing how charge flows through the circuit. Simulations from the excellent www.falstad.com/circuit/
UAF's 2019 Mining Robot (Robotic Mining Contest)
zhlédnutí 133Před 3 lety
This is UAF's mining robot at the 2019 Alabama national finals in the Caterpillar-sponsored robotic mining contest. We're currently building a robot for the May 2021 NASA Robotic Mining Contest! This robot weighs 40kg, and is powered by 24V 5000mAh lipo batteries. The frame is 4130 steel, so it wiggles but won't break.
What I love about Computer Science
zhlédnutí 140Před 3 lety
Why computer science is a good choice for a college major! www.cs.uaf.edu
Make a Garden Bed: Alaska Solar Greenhouse 5
zhlédnutí 48Před 3 lety
Make a Garden Bed: Alaska Solar Greenhouse 5
Logistics Robot in Mars Virtual Colony
zhlédnutí 107Před 3 lety
Logistics Robot in Mars Virtual Colony
Making Steel from Basalt: Seminar 2019 02 05
zhlédnutí 163Před 4 lety
Making Steel from Basalt: Seminar 2019 02 05
Blasting rock on Mars with perchlorates
zhlédnutí 116Před 4 lety
Blasting rock on Mars with perchlorates
Building Walls: Alaska Solar Greenhouse Episode 3
zhlédnutí 55Před 4 lety
Building Walls: Alaska Solar Greenhouse Episode 3
Can basalt-reinforced plastic hold air on Mars?
zhlédnutí 379Před 4 lety
Can basalt-reinforced plastic hold air on Mars?
Mixing Concrete: Alaska Solar Greenhouse Episode 2
zhlédnutí 52Před 4 lety
Mixing Concrete: Alaska Solar Greenhouse Episode 2
Repairing an Alaska Footbridge using Linear Actuators
zhlédnutí 159Před 4 lety
Repairing an Alaska Footbridge using Linear Actuators
Mars flythrough: Hellas crater, Dao Vallis
zhlédnutí 355Před 4 lety
Mars flythrough: Hellas crater, Dao Vallis
Alaska Solar Greenhouse Episode 1: Dirtwork Surprises!
zhlédnutí 85Před 4 lety
Alaska Solar Greenhouse Episode 1: Dirtwork Surprises!
Alaska Raven making soft musical sounds
zhlédnutí 3,1KPřed 4 lety
Alaska Raven making soft musical sounds
Computer Science at the University of Alaska Fairbanks
zhlédnutí 142Před 4 lety
Computer Science at the University of Alaska Fairbanks
Three polarizing filters: a simple demo of a creepy quantum effect
zhlédnutí 106KPřed 5 lety
Three polarizing filters: a simple demo of a creepy quantum effect
😂🤣😂🤣
Hey Tommy, I'm trying to find a contact email for you, as I'd like to make an interview request. Please let me know
Insane!
Makes me think of matrix multiplication
Thumbnail literally felt like the video was a render
It’s not creepy to me, i find it magical and awesome!
i have a idea that ur massaging the waves into a spin
Sorcery.
It's more like telling the photons come through the first filter to polarize diagonally, which isn't enough for the third filter to block them. The other two filters combined with no interruption will always block all light. So that makes sense to me.
Ever try wearing polarized sunglasses beneath a motorcycle helmet with a polarized visor? It's pretty weird, especially when you turn your head.
QuAnTuM EffeCt
Stopit
it bounces off the diagnoal lines at an angle that allows it to penetrate the vertical polarization...if this is real
Why this always confuses Simple-Minded people Is because some commenters think light is a particle and some commentors think light is a wave. well, it's neither, Light is a coaxial perturbation of the aether. It is neither a particle nor a wave. Light does not travel. It propagates, there is nothing moving from here to there. Nikolai Tesla said "Light propagates through the aether the same way sound propagates through air." The speed of the action is dependent on the medium that it's propagating through. Light propagates at 186,284 mps. That is the rate of induction of the aether. Sound propagates roughly 1100 feet per second in air, at sea level. Through water, sound propagates many times faster, through steel, sound propagates at 85,000 ft per second. So you see, it's all dependent on the medium. Light and sound are nothing more than compression rarafaction events of a medium, Frequency specific. You're welcome... .
My mind says it’s just bending the light between the horizontal and vertical to be in between, diagonal, but once you block the light with sequential filters the light has been stopped already.
Was there a reason that you could not put the camera on the same level as the filters?
I have discovered a truly marvelous explanation for this, which this comment field is unfortunately too narrow to contain.
All it does is finish the rotation.
having my own personal views on how light propagates, i cannot accept a transverse wave as even being possible... i only ever see transverse waves on the SURFACE of things. at the junction of two media, where one is free to oscillate in the other... and in doing so, will produce perpendicular compression waves in the OTHER medium. i have never seen any example of a transverse wave propagating THROUGH anything. it has been demonstrated with ultrasonic arrays that sound can be "beamed", much like a laser... you cant detect it at right angles, its passage. only its interference with something... "theres the red dot" versus "theres the sound"... a lightbulb sprays light everywhere, as does a loudspeaker... we can manipulate both with reflectors, parabolas... to me, this relates back to sound, and the fact that when we "see", we are using an array of tiny sensors that are still LARGER than the wavelength they detect, and further apart... whereas when we HEAR, we use a SINGLE (pair...) membrane that is far SMALLER than the lowest wavelength it detects... but also, just as importantly... the way the... "impulse" is created in the first place! why do i see colours with plastic, a change of FREQUENCY, but plain polarising filters are always just... filters? they filter ALL wavelengths, not selective ones... the "rule" that one cannot "polarise a longitudional wave" aka compression wave was "determined" before we had amplifiers, microphones, speakers, radio... i havent seen anyone challenge that theory... and thats what it is.. a THEORY.
.
The diagonal filter can't unblock sunlight that never gets to it.
I'd be more creeped out if the effect was happening when holding the filter between the camera and the two standing filters.
Interesting visual but terrible explanation. There are much better out there...
Portal 3 confirmed...
This is a result of polarising filters not being “perfect.” Nothing more.
You are making people more stupid
That was really interesting. Thank you Orion. This is a perfect example of why CZcams was conceived in the first place, for interesting, educational short films like this. Brilliant.
I think that happens because light enters from the sides also. If these lenses were in a tube there would be no extra light to influence your answers.
The explanation can be found in the video 'circular polarisation' in the channel uclaphysicsvideo.
this isnt a quantum effect. Iits just a normal vector component effect. you can get the same dffect with forces (which are also vectors). if you pull something up it wont move sideways. if you pull sideways is wont move up. but if you restrict the movemend in 45 degrees you get a movement sideways when pull up.
I don't think that's a quantum effect. Doesn't it have to do with the direction the waves are passing through? So you change the angle by changing the location of any particular filter.
The paradox appears by confusing the function of a polarizer with that of a filter. Polarizers do not strictly filter (remove) components of the light, but can _add_ a polarized component to the light. If completely vertically polarized light hits the horizontal polarizer or vice versa, it is completely filtered. However, as it passes through the 45-degree filter, some of the light will be both horizontally and vertically polarized, making it survive the final filter. This perfectly explains why less light is filtered when the angled polarizer is placed in the middle, rather than the beginning or the end. You do not require quantum mechanics to explain this effect, so by Occam's Razor, it is the most likely explanation.
Well said
Interference, not filtration
@@mrknesiah Thank you!
damm you I was gonna point that out so I'd look smart. :p
"You do not require quantum mechanics to explain this effect" ok but how you do explain and calculate the polarizer "adding a polarized component to the light" without quantum mechanics. The way polarizers work and the mathematics behind them are deeply rooted in quantum descriptions of photons if I'm not mistaken
This is a simple phenomenon and easily calculated with same math for doing vector decomposition/projection. Imagine you have an ice cube that is inside some rails that only allow it to slide from left to right, and another one in another rail that only allows it to slide back and forth (i.e. perpendicular to the first rail). If you throw one against the other, the other will not move, because the impact force is perpendicular to the direction it is able to move. But if you have a third cube in a diagonal rail, you can push the first one against the diagonal which will then slide with ~0.7 of the speed of the first one, and that one can hit the third one which in turn will slide with 0.5 of the original speed, thus able to "rotate" a force by 90º (but losing some of the power), where before it seemed impossible. This will not work if that diagonal one is the first or the third, same as we see in the video.
It's easy to understand if you think the lens are "turning / twisting" the waves to the arrow direction. So when you put the third filter diagonally between the 1st and 2nd filter, you are just 'undoing' part of the turning the 1st filter did.
Exactly.
So the light is not blocked but realigned to some degree?
No, the filter is not capable of "twisting" the direction of polarization.
@@MirlitronOneThis is exactly what is happening. Polarisation filter absorbs a photon and there are two outcomes of this event: -energy from the absorbed photon is dissipated as heat -a photon with a polarisation aligned to the filter axis is emmited The probability of these outcomes is given by malus law.
Ty for that explanation @@matbmp8996
Polarization is a wave phenomenon. There is nothing quantum about this demonstration. When the 3rd filter is placed between vertical and horizontal filters it repolarizes the light from the vertical filter and transmits a component of that light (the cosine) to the horizontal filter. That 45 degree polarized light is then repolarized by the horizontal filter and transmits a component of that light. There is only 100% blockage when the light passes directly between two filters that are at 90 degrees. (like when the 3rd filter is first or last in order. Any other combination allows some light to transmit. Photons don’t “know” or “hear” anything. Anthropomorphizing photons is not helpful and leads to discussions of “consciousness”.
The question here is how to understand polarization from a particle perspective, not the wave perspective. Photons indeed don't know or hear anything, but their behavior in a filter lets us 'ask questions' about their polarization, and the results tell us something interesting about quantum measurement (see description).
So you can't explain it either! 😂
God I love this. I have actually won a bet with this effect.
I love when people pretentiously confuse description with explanation
I don't understand your comment; no one is explaining the effect here. 🤔
The so-called paradox is also easily demystified simply by changing the order of the polarizers. In order of appearance A horizontal B at 45 degrees of A C vertical The end result will be exactly the same as with the "paradoxical" setting whereby C is slipped in between A and B, but without first turning A dark and opaque. Somebody not present while the polarizers were being set up would never notice the difference, since there is none.
Let us assume, for the sake of argument, that, instead of polaroid filters, we are using black filters with a hole in the center, We have to put our eye close against the hole to be able to see directly beyond it. Rotating the first filter misaligns the hole relative to the hole of the second filter, showing us, besides the scene directly behind the first filter, the black and opaque surface of the second filter. If we now put a third filter between the first and the second, at 45 degrees, still with our eye against the first hole, we are able to look through the hole of the third filter, at least partially, all the way through the second filter and beyond.
I think it's due to directional waves...the small change of degree the transferability of photon will get through...Whereas the large sudden change will put to halt.
If your are a positive person you will get a positive answer. If you are a negative person you will get a negative answer. If you are unsure you will never be sure of your answer. The power is in the question not the answer.
Thanks for sharing a cool [ literally] dunk in the creek! 🥶
its not complicated if you just think about it.
I understand nothing.
This intuitively makes sense, think of it like a percentage of light being filtered; percentage wise the first polarizer removes 50% of light, the second polarizer at 90 degrees from the first removed the other 50% reaching 0% light throughput. Adding a third in between at 45 degrees removed only half from the first 50%, giving 25%, then the third acts as the first polarizer resetting the wave direction, passing fully through the last one.
Rush it to the bin before it sublimates!
Oh man, I just dog a 400' trench to get internet to my shop. Could have just dialed in this guy! very cool!
I woke up this morning thinking about this experiment and using it on entangled photons. It is always said that you can’t use entanglement to communicate faster than light because you cannot “know” the polarisation of a photon until you measure it, and then it is destroyed and so if you measure its entangled twin, it won’t allow you to infer any information about the other photon. But it seems here, that you can actually change the polarisation of a single photon by using several polarising filters. Surely, this method will allow you to encode information in the polarisation, and hence in the polarisation of the entangled twin, and so “communicate” (I know it’s only a kind of synchronicity) faster than light.
HI BRANDON!!! 👋 Uncle Drew says hi.