Posts Tagged‘video’

Linear Friction Welding of…Wood?

Friction welding is a fascinating process, able to join dissimilar metals and plastics together with bonds that are far stronger than their welded counterparts. As far as I was aware though it was limited to inorganic materials, mostly because other materials would simply catch fire and not fuse together. As it turns out that’s not the case and recent research has shown that it’s possible to friction weld pieces of wood together in the much the same way as you would metal.

What’s particularly interesting about the process is how similar it is to friction welding of metals or plastics. Essentially the rubbing of the two surfaces together causes the interfaces to form a viscous film that mixes together and, when the friction is stopped, fuse together. For the above video you can see some of the film produced escaping through the sides due to the large amount of pressure that’s applied to ensure the weld is secured. Like all other kinds of friction welding the strength of the joint is dependant on a number of factors such as pressure, period of the friction motion and duration of the weld. As it turns out friction welding of wood is actually an active area of research with lots of investigation into how to create the strongest joints.

Even cooler is the fact that some researchers have developed a technique that allows the welds to be done with no fibres being expelled out the sides. This means that there was no charring of the interface medium, enabling the resulting weld to be even stronger and much more resistant to intrusion by moisture. Whilst you’re not going to see a sub built of friction welded wood any time soon it does mean that, potentially, your house could be built without the use of fasteners or joiners and the first rain that came through wouldn’t make it all come unstuck.

Don’t think you can just go off and rub two pieces of wood together though, the frequency required to fuse the wood was on the order of 150Hz and a pressure of 1.9MPa, far beyond the capabilities of any human to produce. Still it’s not unthinkable that a power tool could be made to do it, although I lack the mechanical engineering experience to figure out how that would be done. I’m sure someone will figure that out though and I can’t wait to see what kind of structures can be made using friction welding techniques.

The Sun’s Serenity.

Our sun is an incredibly violent thing, smashing atoms together at an incredible rate that results in the outpouring of vast torrents of energy into our solar system. Yet from certain perspectives it takes on a serene appearance, its surface ebbing and flowing as particles trace out some of its vast magnetic field. Indeed that’s exactly what the following video shows: a gorgeous composition of imagery taken from NASA’s Solar Dynamics Observatory. Whilst not all of us have the luxury of a 4K screen it’s still quite breathtaking to behold and definitely worth at least a few minutes of your time.

SDO has been in orbit for 5 years now keeping an almost unbroken eye on our parent star. Its primary mission is to better understand the relationship that our earth and the sun have, especially those which have a direct impact on daily life. To achieve this SDO is observing the sun in multiple wavelengths all at once (shown as different colours in this video) and on a much smaller timescale than previous craft have attempted. This has led to insights into how the sun generates its magnetic field, what it looks like and how the complex fusion processes influence the sun’s varying outputs like solar wind, energetic particles and variations in its solar output. Those images aren’t just rich with scientific data however as they showcase the sun’s incredible beauty.

So, how’s the serenity? 😉

The Incredibly Complexity of Ant’s Antenna Cleaning.

We’ve all watched ants go about their business. They scurry along the ground or up walls, busying themselves with transporting all sorts of things back to their nest. Every so often though you’ll see them stop and begin cleaning themselves, rubbing their antennae vigorously for quite a while before they continue the task at hand. If you’re like me you thought that was a pretty simple thing, all animals need to keep themselves clean, but that simple process belies some incredible evolutionary adaptations that ants have. Indeed as the video shows these adaptations are so advanced that replicating them could provide some benefits for the semiconductor industry.

This translation of evolutionary adaptations being translated to technical applications is called biomimicry and has played a pivotal role in technological development for quite a while. Some of the most notable examples include the development of velcro which takes inspiration from the hooks present on burs which allowed them to attach to an animal’s fur in order to spread their seed over a greater distance. The combo that the ants have could prove useful for semiconductors which are very susceptible to contamination, with other potential applications at the micro scale that require similar filtration and cleaning.

Isn’t it amazing what millions of years of evolution can come up with!

The Solar System to Scale.

Scale is something that’s hard to comprehend when it comes to celestial sized objects. The sheer vastness of space is so far beyond anything that we see in our everyday lives that it becomes incomprehensible. Yet in such scale I find perspective and understanding, knowing that the universe is far greater than anything going on in just one of its countless planets. To really grasp that scale though you have to experience it; to understand that even in our cosmic backyard the breadth of space is astounding. That’s just what the following video does:

Absolutely beautiful.

3D Printed Model Jet Engine Demonstrates Reverse Thrust.

Have you ever wondered how planes manage to slow down so fast? It’s not that they have amazing brakes, although they do have some of the most impressive disc brakes you’ll ever see, no most of the work is done by the very thing that launches them into the sky: the engines. The way they achieve this is called thrust reversal and, as the name would imply, it redirects the thrust that the engine is generating in the opposite direction, slowing the craft down rather than accelerating it. The way modern aircraft achieve this is wide and varied but one of the most common ways is demonstrated perfectly with this amazing 3D printed scale model:

The engine that the model is based off of is a General Electric GEnx-1B, an engine that’s found in the revamped Boeing 747-8 as well as Boeing’s new flagship plane the 787. Whilst this model lacks the complicated turbofan internals that its bigger brothers have (replaced by a much simpler electric motor) the rest of it is to specification, including the noise reducing chevrons at the rear and, most importantly, the thrust reversal mechanism. What’s most impressive to me is that the whole thing was printed on your run of the mill extruder based 3D printer. If you’re interested in more details about the engine itself there’s an incredible amount of detail over in the forum where the creator first posted it.

As you can see from the video when the nacelle (the jet engine’s cover) slides back a series of fins pop up, blocking the fan’s output from exiting out of the rear of the engine. At the same time a void opens up allowing the thrust to exit out towards the front of the engine. This essentially changes the engine from pulling the craft through the air to pushing back against it, reducing the aircraft’s speed. For all modern aircraft, even ones that use a turboprop rather than a fan, this is how they reduce their speed once they’ve touched down.

Many of us have likely seen jet engines doing exactly that but the view that this model gives us of the engine’s internals is just spectacular. It’s one of those things that you don’t often think about when you’re flying but without systems like these there’s no way we’d be flying craft as big as the ones we have today.

Lexus’ Hoverboard is Deceptive Wankery.

There are some technological ideas that captivate the public consciousness, our want for them to exist outstripping any ideas of practicality or usability. Chief among such ideas is the flying car, the seemingly amazing idea which, should it ever become mainstream, poses far more issues than it could ever solve. Still there have been numerous companies who have worked towards making that idea a reality with nearly all of them meeting the same fate. A close second (or third, if you’re more a jetpack fan) is the hoverboard, a device that replicates the functionality of a skateboard without the wheels. Our collective desire for something like that is what results in videos like the following and, honestly, they give me the shits:

Anyone who’s followed technology like this knows that a hoverboard, one that can glide over any surface, simply isn’t possible with our current understanding of physics and level of technological advancement. However if you grab a couple powerful electromagnets and put them over a metallic surface you can make yourself a decent simulacrum of what a hoverboard might be, it just can’t leave that surface. Indeed there’s been a few of these kinds of prototypes in the past and, whilst they’re cool and everything, they’re not much more than a demonstration of what a magnet can do.

This is where Lexus comes in with their utterly deceptive bullshit.

Just over a month ago Lexus put out this site showing a sleek looking board that was billowing smoke out its sides, serenely hovering a few inches above the ground. The media went ballistic, seemingly forgetting about what would be required to make something of this nature and the several implementations that came before it. Worst still the demonstration videos appeared to show the hoverboard working on regular surfaces, just like the ones in the movies that captured everyone’s imaginations. Like all good publicity stunts however the reality is far from what the pictures might tell and I lay the blame squarely at Lexus for being coy about the details.

You see the Lexus hoverboard is no different to the others that came before it, it still uses magnets and requires a special surface in order to work. Lexus built that entire set just to demonstrate the hoverboard and was mum about the details because they knew no one would care if they knew the truth. Instead they kept everything secret, making many people believe that they had created something new when in reality they hadn’t, all they did was put a larger marketing budget behind it.

Maybe I’ve just become an old cynic who hates fun but, honestly, I really got the shits with Lexus and the wider public’s reaction to this malarkey. Sure it looks cool, what with the slick design and mist cascading over the sides, but that’s about where it ends. Everything past that is Lexus engaging in deceptive marketing tactics to make us think it’s more than it is rather than being straight up about what they did. Of course they likely don’t care about what a ranty blogger on a dark corner of the Internet thinks, especially since he’s mentioned their brand name 10 times in one post, but I felt the need to say my peace, even if it wouldn’t change anything.


Nokia Resurfaces as a…Virtual Reality Video Startup?

Nokia was once the king of the phones that everyone wanted. For many it was because they made a solid handset that did what it needed to do: make calls and send text messages. Their demise came at their inability to adapt to the rapid pace of innovation that was spurred on by Apple and Google, their offerings in the smartphone space coming too late, their customers leaving for greener pastures. The result was that their handset manufacturing capability was offloaded to Microsoft but a small part of Nokia remained independent, one that held all the patents and their research and development arm. It seems that that part of Nokia is looking to take it in crazy new directions with their first product being the Ozo, a 360 degree virtual reality video camera.


Whilst Nokia isn’t flooding the newswaves with details just yet we do know that the Ozo is a small spherical device that incorporates 8 cameras and microphones that are able to capture video and sound from any angle. It’s most certainly not the first camera of its kind with numerous competitors already having products available in this space but it is most certainly one of the better looking offerings out there. As for how it’d fare against its competition that’s something we’ll have to wait to see as the first peek at the Ozo video is slated to come out just over a week from now.

At the same time Nokia has taken to the Tongal platform, a website that allows brands like Nokia to coax filmmakers into doing stuff for them, to garner proposals for videos that will demonstrate the “awesomeness” of the Ozo platform. To entice people to participate there’s a total of $42,000 and free Ozo cameras up for grabs for two lucky filmmakers, something which is sure to attract a few to the platform. Whether that’s enough to make them the platform of choice for VR filmmakers though is another question, one I’m not entirely sure that Nokia will like the answer to.

You see whilst VR video has taken off of late due to YouTube’s support of the technology it’s really just a curiosity at this point. The current technology strictly prohibits it from making its way into cinemas, due to the fact that you’d need to strap an Oculus Rift or equivalent to your head to experience it. Thus it’s currently limited in appeal to tech demos, 3D renderings and a smattering of indie things. Thus the market for such a device seems pretty small, especially when you consider there’s already a few players selling their products in this space. So whilst Nokia’s latest device may be a refreshing change for the once king of phones I’m not sure it’ll become much more than a hobby for the company.

Maybe that’s all Nokia is looking for here, throwing a wild idea out to the public to see what they’d make of it. Nokia wasn’t exactly known for its innovation once the smartphone revolution began but perhaps they’re looking to change that perception with the Ozo. I’m not entirely convinced it will work out for them, anyone can throw together a slick website with great press shots, but the reaction from the wider press seems to indicate that they’re excited about the potential this might bring.

Programming Magnetic Fields.

Everyone is familiar with the traditional bar magnet, usually painted in red and blue denoting the north and south poles respectively.You’re also likely familiar with their behaviour, put opposite poles next to each other and they’ll attract but put the same poles next to each other and they repel. If you’ve taken this one step further and played around with iron filings (or if you’re really lucky a ferrofluid) you’ll be familiar with the magnetic field lines that magnets generate, giving you some insight into why magnets function the way they do. What you’re not likely familiar with is magnets that have had their polarity printed onto them which results in some incredible behaviour.

The demonstrations they have with various programmed magnets are incredibly impressive as they exhibit behaviour that you wouldn’t expect from a traditional magnet. Whilst some of the applications they talk about seem a little pie in the sky at their current scaling (like the frictionless gears, since the amount of torque they could handle is directionally proportional to field strength) a lot of the others would appear to have immediate commercial applications. The locking magnets for instance seem like they’d be great solution for electronic locks although maybe not for your front door just yet.

What I’d be interested to see is how scalable their process is and whether or not that same programmability could be applied to electromagnets as well. The small demonstrator magnets that they have show what the technology is capable of doing however there are numerous applications that would require much bigger and bulkier versions of them. Similarly electromagnets, which are widely used for all manner of things, could benefit greatly from programmed magnetic fields. With the fundamentals worked out though I’m sure this is just an engineering challenge and that’s the easy part, right?

Science Powered Zen Garden.

I’ve always appreciated the simple beauty of Zen gardens, mostly from afar as my natural instinct is to run directly to the perfectly groomed sand and mess it all up. That being whilst I may have kindled an interest in gardening recently (thanks to my wife giving me some chilli plants for Christmas) I have very little interest in creating one of these myself, even of the desktop variety. The video below however demonstrates a kind of Zen garden that I could very well see myself spending numerous hours, mostly because it’s driven by some simple, but incredibly cool, science.

On the surface it seems like a relatively simple mechanism of action, two steel balls roll their away across the sand and produce all sorts of patterns along the way. The reality of it is quite a bit more interesting however as, if you watch closely, you can see that the two steel balls’ motion is linked together around a single point of motion. This is because, as Core77’s post shows, there’s only a single arm underneath the table which most likely houses 2 independent magnets that are able to slide up and down its length. In all honesty this is far more impressive to me than how I would’ve approached the problem as it makes producing the complex patterns that much more challenging. If it was left to me I would’ve had a huge array of magnets underneath the surface, but that seems like cheating after seeing this.

Anodized Titanium’s Rainbow.

I am always amazed when something that I think I understand completely turns out to be far more complicated than I first thought. The anodizing process was one of these things as, back in the day, I had investigated anodizing some of my PC components as a way of avoiding having to go through the laborious process of painting them. Of course I stopped short after finding out the investments I’d need to make in order to do it properly (something my student budget could not afford) but the amount of time I poured into researching it left me with a good working knowledge of how it worked. What I didn’t know was what it could achieve when titanium was used for anodizing as it’s able to produce an entire rainbow’s worth of colours.

The wave of colours you see the metal rapidly transition through aren’t some kind of trick it’s one of the interesting properties of how the thickness of a deposited titanium layer interferes with light passing through it. As the thickness of the layer increases the interference increases, starting off with a kind of blue colour and then shifting through many different wavelengths before finally settling on the regular metallic colour that we’re all familiar with. This process can be accurately controlled by varying the voltages applied during the anodizing process as that determines the resulting thickness of the layer that’s deposited onto the host material. In the above example they’re going for a full coating, hence why the bar rapidly flashes through different colours before settling down.

These kinds of reactions always fascinate me as it shows how things can behave in extraordinarily different ways if we just vary a small few parameters in one way or the other. It’s one of those principles that drove us to discover things like graphene which, at its heart, is just another arrangement of carbon but the properties it has are wildly different to the carbon that most of us are familiar with. It just goes to show that when you think you know science is always ready to throw you another curveball and that’s why I find things like this so exciting.