Sounds of Science #04

Dark Energy

So most of our universe (over 70%) is made up of something called Dark Energy. We can't see it and we don't really know what it is...

Matter - everything that makes up me, you, planets and stars - appears to make up only a very small fraction of the universe, about 4%. Instead, the universe seems to be filled predominantly by a very strange material known as dark energy and it is this material, with it's anti-gravity properties, which seems to speeding up the expansion of our universe. We've known that the universe was expanding since Edwin Hubble made his observations in the 1920s, however it's only in the last 20 years that we've realised that this expansion is actually speeding up! The problem is that we can't directly detect dark energy and this makes it very difficult to understand what it is and whether it really does exist.

Instead we must rely on indirect observations, looking at light travelling from the far reaches of the universe to determine whether the properties of this light has changed during the time it has taken to reach us. A good way to measure the expanding universe is to make observations of distant supernovae (huge explosions which follow the death of large stars) which act as 'standard candles' or 'lighthouses' because we know how bright these object should be. Measuring light from distant supernovae has allowed us to see that it is different to what it should be if these objects were positioned within a static universe. Instead what we see is changes in this light which indicates that these objects are being flung outwards and away from us via some sort of cosmic expansion.

A nice analogy to describe the expansion of the universe is what happens when two points are drawn on the surface of an inflating balloon. As the balloon is inflated, the two points begin to move further and further away from each other and as the material expands outwards, the distance between the two points also increases. Applying this analogy to the cosmos, we could imagine the same happening with two galaxies being pulled apart from each other as the space they exist in expands.

As dark energy is so difficult to detect, scientists have recently been looking for new ways to independently verify its presence within the universe. Whilst at the BBC I was lucky enough to interview cosmologist Dr Chris Blake from Swinburne University, Australia who has recently published two papers reconfirming dark energy via a new set of methods. Blake and his colleagues produced a galaxy map of over 200,000 galaxies and used this information to look at how these galaxies were distributed and how they grew relative to each other. Through this work Blake and his colleagues were able to reconfirm the presence of dark energy and perhaps most importantly were able to determine some of its properties.

I thought I'd use the audio from this telephone interview and spruce it for the next sounds of science episode:

[soundcloud width="100%" height="81" params="" url="http://api.soundcloud.com/tracks/18436704"]

It probably sounds better with headphones (or obviously decent speakers).

Useful links:

http://www.bbc.co.uk/news/science-environment-13462926

 http://preposterousuniverse.com/writings/cosmologyprimer/faq.html#dmde

http://supernova.lbl.gov/PhysicsTodayArticle.pdf

Painting with Video

Content is Queen

Below are two very novel and dynamic video portraits generated by artist Sergio Albiac. He has come to call the technique used to create these pieces 'generative video painting'.

http://vimeo.com/24065726

You can see in the movie above, that the portrait is constructed from a 'collage' of different video clips, similar (but wonderfully more complex) to the effect seen in a photo mosaic image.

Albiac describes that his technique...

 “...uses regions of video content to effectively represent or “paint” heterogeneous regions of the image. Both the partial content of the videos and the whole image are fully visible at the same time, widening the possibilities to deliver meaning in a contemporary aesthetic language.”

The effect creates a duality in the work; presenting an un-synced mish-mash of partially visible video content which is used together to construct a more complete, unified form, in this case portraits of two very famous women.

http://vimeo.com/23974393

Vue Lumière No 765 - Serpentine Dance, 1896

One interesting piece of media I came across today (whilst reading about the origins of cinema) was an early piece of footage shot by the Lumiere brothers in 1896: http://vimeo.com/20209451

The silent film depicts an unnamed dancer quite hauntingly perform Loie Fuller’s Serpentine Dance. Each frame was hand coloured to help vividly depict the striking motion conducted by the dancer.

Auguste Lumière and Louis Lumière were among the earliest filmmakers in history and produced some of the most pioneering and influential films of their time. The brothers are best known for producing their series of short ‘actuality’ films, which captured everyday events on film. These ‘actuality’ films are considered by many to represent the earliest incarnation of the documentary film.

Dazed Live show now on Mixcloud

We had a great time playing our hand picked sounds of science at Dazed Live on Saturday - thanks to Chris from Super/Collider for inviting us on!

The show has now been uploaded to Mixcloud so give it a listen! - also on the show is music from Bright Star Catalogue and interviews with the likes of Jay Cousins (buy this satellite) and Magnus Larsson !

Check it out at this link: http://www.mixcloud.com/dazed/dazed-live-super-collider/

For some reason the embedded player below refuses to work.

DAZED LIVE

I will be appearing alongside course mate Rosie and Chris from Supercollider on Dazed Live radio at 1pm this Saturday as part of the DAZED LIVE festival to discuss our favorite sounds of Science!

Not sure exactly how you can tune in, but I'll update you when I find out!

The lineup for the festival looks pretty snazzy, with a nice mix of music, talks and exhibitions - hopefully I'll get a chance to check some of these out - to find out more and to see the full lineup for the festival go on down to their website: http://dazedlive.com/

Here's a track I recently came across entitled 'Particles of God' by Jeff Oster which I hope we'll get a chance to play, it's inspired by and incorporates samples from the LHCsound project which I covered in my first Sounds of Science episode here

Alder Hey's Dawn Chorus

Our response to sound and noise are influenced heavily by the psychological associations we have with them. Hospitals and their internal soundscapes obviously carry very negative connotations and in the case of young children these negative associations can lead to increased levels of distress and fear. However the reverse of this is also true, certain sounds can have very positive associations and the effect of listening to these sounds can be very positive and powerful.

Several weeks ago, I was walking down the central corridor of Liverpool’s Alder Hey children’s hospital when I became aware of the sound of birdsong. As I continued down I could hear quite clearly the sound of a single blackbird gracefully chirping through the din of the chaotic hospital. As I focused on the sound I found that it brought with it a sense of calm and I begun to lose the feeling of unease that I tend to experience inside hospitals. However, there was no sign of this little bird or any other wildlife inside the hospital, save from the colourful murals adorned across the corridor walls. I quickly realised that what I was listening to was a very special sound installation; playing out the wonderful recordings made by BAFTA award winning sound artist Chris Watson.

I’d come to Alder Hey specifically to talk with their Arts Coordinator Vicky Charnock to find out how the hospital had been experimenting with sound to improve the experiences of their young patients. I also got chance to speak with Chris Watson, the creative talent behind the installation and he explained to me why he chose to bring the sounds of a local park within the walls of this hospital.

The Dawn Chorus installation forms part of the larger Sonicstreams project which is a creative collaboration between Alder Hey and the Foundation for Arts and Creative Technology (FACT); the project aims to creatively explore the impact of sound on the human body.

You can listen/download the radio piece below:

[soundcloud width="100%" height="81" params="" url="http://api.soundcloud.com/tracks/12781881"]

Sounds of Science #03

EchoBank

In this Episode I visit Dr Kate Jones at the Zoological Society of London to find out about a bat call reference library they're developing called 'Echobank' which is being used in conjunction with the iBats monitoring program. Scientists at the Zoological Society of London are using Echobank to teach a neural network to identify specific bat species from the acoustic properties of their calls.

Although this may sound pretty niche, it's really cool stuff because the technology has much wider applications. Firstly the team are using it in combination with a smart phone app which can be used by anyone to take bat call recordings. In doing this the team hope to collect global distribution data for bat populations, which Dr Jones is hoping to use to determine whether bats can be used as a 'heart monitor' for the state of the environment. As bats represent one fifth of all mammalian species and exist in a huge range of habitats (from your local park to the tropics), changes in their global distribution could be used to monitor the impact of climate change on the natural world.

Secondly, the team are doing a lot of really important science engagement, working with ‘citizen science’ networks across Europe to gather data on bat populations. The team have been helping groups across Europe to develop and carry out their own monitoring programs, which feed data back to the iBats program. What’s great about this work is that it’s not only efficiently collecting distribution data, but also getting people interested in the state of their local environment. Standardisation is obviously an important factor when collecting data from multiple sources and with this in mind the team have developed the smartphone apps which can be used easily to take recordings and GPS data.

Finally (and what really excited me) was the suggestion that this ‘digital infrastructure’ could one day be adapted to identify any sound producing species from a recording taken on a smartphone. So imagine going out to your local park, taking a recording of a bird on your iPhone and getting probability results back on the identification of the species!

You can listen to the episode here:

[soundcloud width="100%" height="81" params="" url="http://api.soundcloud.com/tracks/11704888"]

Download it here

Or listen to the edited version as part of Short Science episode 89

Special thanks to Katie Draper who helped out with this episode!

Not bad for an old man... (Apollo 14)

Continuing the Apollo 14 coverage - I was inspired to create a short radio piece on the mission which was broadcast on our 'Science @ 1' show earlier today. Check it out: [soundcloud width="100%" height="81" params="" url="http://api.soundcloud.com/tracks/13521655"]

[Update 03/05/11]

This segment was included on Short Science_89

[youtube=http://www.youtube.com/watch?v=IhXsjENGrk0&feature=related]

"It looks like you’re about on the bottom step... and on the surface."

"Not bad for an old man."

- Mission Control referring to Alan Shepard as he first stepped out onto the moon's surface. At the age of 47, Shepard was the oldest man to ever walk on the moon.

14

I went to a very interesting night (run by Super Collider) on Monday evening which celebrated the 40th anniversary of the Apollo 14 lunar mission with a talk from Dr Christopher Riley – a broadcaster and expert on all things Apollo. Dr Riley also launched his new video installation entitled ‘Cone Crater’ - which I believe is showing throughout February at the Book Club in Shoreditch.

I must admit I knew very little about the story of Apollo 14, which turns out to be pretty interesting so I'll fill you in on some of the details...

Apollo 14 was the eighth manned mission in the Apollo program and the third to take men to the moon. The nine day mission took Commander Alan Shepard, Command Module Pilot Stuart Roosa and Lunar Module Pilot Edgar Mitchell to the moon after taking off from the Kennedy Space Centre on January 31st, 1971. Five days later Shepard and Mitchell landed on the moon in their Lunar Module whilst Roosa remained alone in orbit, aboard the Command Module.

The lunar landing was slightly stressful...

1) Firstly during the descent the Lunar Module computer went a bit squiff doo and started to receive an ABORT signal, which nearly initiated an auto-abort of the landing. This would have separated the ascent component of the Lunar Module from the descent component taking the crew back into orbit and thus cancelling a very expensive trip to the moon (not ideal). This was only corrected at the last minute, with Mitchell having to manually persuade the computer (inputting a software patch) to ignore the erroneous signal.

2) As if that wasn't enough, the Lunar Module radar altimeter (I definitely know what this is) failed to lock onto the moons surface, which would usually be pretty hard to miss – this was determined to be a consequence of the earlier software updates (was Microsoft involved?). To remedy this, the crew basically did what you might have done when your computer breaks - they unplugged it; then plugged it back in; only it actually worked.

During their stay on the moon (clocking in at about 33 hours) Shepard and Mitchell went out on two moon walks, the second of which they got very lost on. They attempted to navigate to the rim of a 300m wide crater but instead spent most of the time not actually finding it, so in the end they had to turn back - it turns out they got within 3om of it! In addition to this they also found time to fit in a spot of golf and with a make shift six-iron, Shepard managed to single-handedly (the suits were pretty cumbersome) dispatch two golf balls into the moon’s horizon.

The crew returned to Earth safely, dropping down in the Pacific Ocean on February 9th. During the mission Roosa had brought with him several hundred seeds which on return were planted as commemorative ‘moon trees’ across America. Apollo 14 also clocked up the longest distance traversed by foot on the lunar surface and was the first to utilise colour TV on the moon.

I left the talk in a state of wonder and with a sense of awe at the achievements of the Apollo missions - we'd put men on the moon (and filmed it!) before an age of portable computers, mobile phones and digital cameras. However, I couldn't help but feel slightly dejected by the current state of space exploration, especially with the planned retirement of NASAs shuttle program later this year. I wonder whether I will ever see images beamed back of someone walking on the surface of another world - sadly I very much doubt it.

I'll finish this post with one of my favourite videos - a live performance of Brian Eno's Apollo music (which was created specifically for the documentary 'For All Mankind' - check it out!) this, if anything is enough to keep me wishing for a future in space.

[vimeo http://vimeo.com/13914151]

-Ed

Focal Power

A short film I found whilst browsing Vimeo this morning, I recommend watching in HD and with some boomy speakers: http://vimeo.com/18495371

Although the aerial shots would be interesting in themselves, the film has been manipulated to give the impression of 'miniaturisation' which transforms the film into a collection of enchanting scenes. The miniaturisation of these scenes provides an interesting contrast against the true scale at which power generation and consumption occurs across the planet. The poetically conceived caption for the video describes the scenes as 'examined, microscopically, zoomed in from afar. Dimensions without scale.'

If you look at the film closely you will see that there is a short depth of field with a narrow band of sharp focus running across the image. This false 'miniaturisation' effect can be obtained through a method known as tilt/shift (although it usually only involves tilt) and can be produced optically using specialist lens adaptations or through post-production trickery. In essence, it works by employing the Scheimpflug principle in which the lens plane is 'tilted' relative to the image plane (e.g. the sensor on a digital camera) and produces images similar to those taken at close range with a macro lens.

Usually the point of focus lies parallel to the subject, which means that objects which lie at the same distance from the camera all appear in sharp focus (in other words these objects lie within the 'plane of focus'). By employing the Scheimpflug principle it is possible to orientate the plane of focus so that it passes through the subject creating a much shallower depth of field, which reduces the area of the subject in focus. This can be achieved by 'tilting' the lens (for example upwards) which moves the plane of focus relative to the image and subject plane; a much smaller region of the subject now exists in focus. The diagram below illustrates how the lens plane is no longer parallel to the image plane after the lens tilt.

If you were to shoot a high-rise building face on, with the camera parallel to the building you would obtain an image in which all of the building within the frame was in focus. When employing the Scheimpflug principle and the camera lens is tilted (e.g. upwards), the camera lens and building are no longer parallel. The lower portion of the building is now closer to the lens and the higher portions are now further away, this creates a shallow depth of field and as the plane of sharp focus is tilted the lower and upper portions of the building fall out of focus.

The photo I took below demonstrates the effect of which tilt/shift photography attempts to achieve. This photo, with its shallow depth of field, is taken at close range and involves objects which are very small in size.

Tilt/shift photography is able to recreate this 'miniature' aesthetic in much larger compositions such as those involving stadiums, cities and landscapes. These types of images are most effective when taken at a high-angle and can be shot using specialist tilt lenses or created by applying a false focal gradient in post production (simply with the selective addition of blur).

-Ed