Diffusion Videos

Ever wondered whether it is scientifically possible to become a superhero? In a new series of podcasts, Dr Christopher Pettigrew (aka Dr Boob*) and I are going to tackle this question. Chris is a post-doctoral researcher at the Department of Biochemistry in University College Cork, and in these podcast episodes - which we will publish more than a few times a year - we will uncover whether it is possible now to possess the powers of superheroes, and if we can't, whether in the near future we could engineer ourselves to become superheroes. The first superhero we are tackling is Mystique from X-Men. X-men get their powers from an "X gene" that normal humans do not possess, and Mystique is a shapeshifter who naturally looks blue. Actress Rebecca Romijn portrayed Mystique in the X-Men films - I know I clearly remember the blue body-paint... Mystique has a number of powers including: The ability to change skin colour; The ability to shape-shift - that is, change form; She can impersonate other voices; She can rapidly grow her hair. Within nature, chameleons are able to change their skin colour to match their environment. There are also technologies under current development, such as metamaterials, that can be used to make something look invisible. Through a combination of genetic manipulation to activate melanocytes (and possibly chromatophores), and the use of surface coatings, it is not unforeseeable that we could develop human chameleons. The difficulty here lies in whether we can make a skin colour change a conscious decision - how can you wire up the body such that skin colour responds your thoughts? The challenge of being able to impersonate another person's voice should be easy enough to conquer in the near future through a combination of electronics and simple mimicry. It is also possible to foresee rapid hair growth - this could be accomplished by rapid protein synthesis, such as in spider webs. The biggest difficulty comes with the shape-shifting - how can one change their 3D shape? Tune in to the podcast here (or press play below) to discover what scientific techniques we came up with to tackle the problem of scientifically engineering Mystique: A few extra notes to explain some of the random comments in the show: Iva Davies is the front man of Australian band Icehouse; Shane Warne, Greg Matthews and Graham Gooch are all cricketers who advertised the hair-loss company Advanced Hair; Let us know your thoughts on how we could scientifically engineer Mystique. We rated this a 7.5 out of 10 possibly for the next 200 years - if someone really wanted to, notwithstanding the ethical concerns along the way. Also let us know which superheroes you would be interested in us tackling. * From here on in, Chris will be referred to as Dr Boob - this nickname stems from the fact that Chris's PhD and some of his post-doctoral has been into the study of breast cancer - yes, someone who is actually changing the world!

Créée à Chamonix en 1983 par Patrick Vallençant, skieur de l'extrème, la marque Degré7 a rejoint le groupe Avance Diffusion en 1997. Avec de nouveaux concepts techniques, une innovation permanente dans les matières et les coupes, Degré7 propose à tous les sportifs exigeants une gamme de vêtements élaborés pour affronter les conditions extrèmes. François Gadrey, PDG de la société, présente ici les rouages de la fabrication des vêtements de la marque.Author: Loic_FAVORY Tags: Ski ski extreme freeride Degré Avance Diffusion François Gadrey Posted: 23 October 2009 Rating: 0.0 Votes: 0

Terence Tao is a Professor at the Department of Mathematics, UCLA and one of Australia's most acclaimed mathematicians. Indeed, he is arguably the world's greatest living mathematician. In 2006, he was awarded a Fields Medal, which is the top prize a mathematician can win, and at 24 became the youngest ever full professor at UCLA. I recently went to Tao's Clay–Mahler Lecturer at UNSW, which was a fascinating look at prime numbers. I managed to grab Terence for a quick chat. Listen to this podcast here: Primes are integers that can only be divided by themselves and one. For example, the number 10 can be divided by 1, 2, 5 and 10 - whilst the number 11 can only be divided 1 and 11. The first few primes are: 2, 3, 5, 7, 11, 13, 17, 19, 23, 29, 31, 37, 41, 43, 47, 53 .... One of the interesting things about the primes is that there is no known formula yielding all of them - you can't simply plug a few numbers into a formula to generate a list of the primes. However, on a large scale, their distribution can be modelled. The primes behave as if they are distributed pseudorandomly - see the picture on the right. Each dot in this Ulam spiral represents a prime number - you start in the middle, and wind outwards like a spiral - each dot is a prime, whilst empty space is a non-prime. Whilst you can see various patterns, nothing is predictable. The prime number theorem says that the probability of a given number n being prime is inversely proportional to its logarithm. Euclid proved that there are infinitely many prime numbers way back in 300BC - see Euclid's Theorem for more. The current largest known prime was discovered in 2008 by the distributed computing project Great Internet Mersenne Prime Search and has 12,978,189 digits: 243,112,609 − 1. Primes are very important for public-key cryptography - that is, the way your credit card numbers are encrypted in online transactions. The cryptography makes use of the fact that is difficult to factorise large numbers into their prime factors, whilst it is comparatively easy to multiply two large primes together. No efficient integer factorisation algorithm is currently known - in 2005 a 193-digit number was factorised, but it took 5 months. Terence Tao, along with Ben Green, proved that the sequence of prime numbers contains arbitrarily long arithmetic progressions - this is the Green-Tao theorem. What this means is that for any number k, there is an arithmetic progression of primes k long. An arithmetic progression is one in which the difference between two numbers in the progression is the same. For example, the series 2, 4, 6, 8, 10... is an arithmetic progression with common difference 2. Green and Tao proved that such sequences exist within the primes for any length of series you want. For example, the series 3, 7, 11 is a prime sequence of length 3 with common difference 4. The series 3, 5, 7 is length 3 with common difference 2. The current record is a series of 25 primes. I have just finished reading the excellent book The Music of the Primes by British author Marcus du Sautoy - I highly recommend it. It details the story of the Riemann hypothesis which is considered by many to be the most important unresolved problem in mathematics. A solution to the Riemann hypothesis could make an immense contribution to our understanding of the distribution of prime numbers. You certainly don't need to be a maths geek to understand this book - it is a great historical tale. You can buy the book from Amazon by clicking on the cover on below. I chatted to Terence briefly after his talk, but being the amateur journalist I am, my recorder ran out of batteries! Not to fear, I have added an interview Terence did with Australia radio station Triple J's current affair program Hack - this interview has been reproduced with the permission of the executive producer, best brother James West - it's nice to have a proper professional journo in the family! The interviewer is Kate O'Toole. Listen to this podcast here: God may not play dice with the universe, but something strange is going on with the prime numbers - Paul Erdos

October 15 is Blog Action Day 2009 and this year's topic is Climate Change. The idea is to raise awareness of the topic, so I thought I'd get in on the act - it is still October 15 in some parts of the world... Climate Change is arguably our most pressing human concern. If you are interested in what it is, who’s responsible and why we should care, then an easy way to enter the debate is to have a listen to our 2007 Beer Drinking Scientists episode on the topic. Grab the mp3 here, or listen below: We recorded this in 2007 over a beer or three, and so some of the more recent discoveries and insights are not included. In the Australian context, John Howard was the Prime Minister and we hadn't signed the Kyoto Protocol. The other Beer Drinking Scientist is the irrepressible Darren Osborne. We took a break from these podcasts when I went overseas and Darren started to breed, but we have plans for the future, stay tuned... We have talked about climate change a number of times on this blog and on the podcast. To see all our climate change articles, check out the climate change tag. Interesting articles include: How Iceland is tackling the problem, The battle for an ice-free North Pole, The use of biofuels, What policies we should use to tackle climate change. The importance of climate change to humans and to Earth can not be underestimated. Climate Change also featured in our top 10 science stories of 2006, 2007 and 2008. If you have any thoughts on the topic, feel free to share them or participate in Blog Action Day.

Merci St phane

The dust is finally starting to clear from Sydney, leaving a ruddy orange layer of muck all over the city. This podcast goes with our previous article Red Sydney, and as well as being a description of the science involved, is a video slide show of photos of the dust-storm. All the photos in this enhanced podcast come from flickr and are available to use under Creative Commons licences. Watch the following youtube video, or download the wmv or mp4 versions - mp4 will play on your ipod, wmv is slightly higher quality: The photos come from the following flickr users (click to see the original photo): tolomea (here, here and here); _gemma_; spudmurphy (here and here); psychopyko (here and here); blentley (here and here); halans; colinwynterseton; jamckay (here and here); q15928; jujuly; muffytyrone; sillypucci; planetchopstick; halans; kaptainkobold; t_lawrie; iansand (here and here); mezuni; avlxyz; chanc; 33868550@N07; photosydney; emmettanderson (here and here); sketchesbymez. And after you've checked out the above podcast and photo links, have a look at this - this is a video of a couple driving into a dust storm in Broken Hill, NSW. Amazing!

Aujourd'hui 19H, le réalisateur et le comédien principal de DRH ont été interviewés dans l'émission Le comptoir de l'info sur TeleToulouse. Voici en exclusivité ce petit moment qui pour l'équipe commence à 21:31 mais regardez le reste de l'émission c'est sympa ! Et puis on est caché derrière !http://blog.drh-lesite.comAuthor: Serie_DRH Tags: série DRH télé interview TeleToulouse blog émission sketch diffusion drôle humour fun amusant TLT toulouse W2P Posted: 18 September 2009 Rating: 5.0 Votes: 2

Invité à un dîner de rupture du jeûne du ramadan du Conseil français du culte musulman, le ministre de l'Intérieur a présenté ses regrets à propos de la diffusion d'une vidéo sur Internet dans laquelle il tient des propos racistes. Author: france24 Tags: France brice hortefeux politicien exprime regrets face polémique injuste invité dîner rupture jeûne ramadan conseil français culte musulman diffusion vidéo internet propos racistes Posted: 15 September 2009 Rating: 2.1 Votes: 27

Following on the heels of our Science of Cocktails podcast, we have an episode for the morning after – The Science of Coffee. At the recent Science of Coffee event at Lushbucket Cafe as part of The Ultimo Science Festival, I spoke to Rafael Bartkowski from Campos Coffee about the scientific method of making coffee, the most important steps in the process, how to decaffeinate coffee and where in the world you can find the best cup. Listen to this podcast here: To go with the podcast, here is a quick description of how Campos Coffee decaffeinates their coffee. Swiss Water Decaffeination Campos uses the Swiss Water Process. This method does not use organic solvents, and so is claimed to be better for you. To perform the decaffeination, the first step is to soak green coffee beans in hot water. This releases the caffeine, as well as other soluble compounds within the beans. These other compounds contribute strongly to the taste of coffee – let’s call them “flavour compounds” - and so these particular beans must be discarded. The water solution now contains caffeine and flavour compounds. Caffeine is then stripped from this solution by means of activated carbon filters (see below for a brief description of this process). With the caffeine now stripped from the water solution, we are left with a solution of flavour compounds – this solution becomes “flavour-charged” (the company’s description, not mine!) A new batch of green beans is then soaked in the flavour-charged solution, releasing caffeine but less of its flavour-compounds, as the solution is becoming saturated. This solution is again decaffeinated by a carbon filter, and new beans are added. This process is repeated until the flavour-charged solution is saturated with flavour-compounds, but crucially not caffeine as the caffeine is stripped from the solution after each soaking. After a number of repeats, no flavour-compounds are released by the green beans - only caffeine is released. This leaves us with (almost) decaffeinated beans that can be roasted to make coffee. It is impossible to completely decaffeinate the coffee. Given that the world’s only Swiss Water decaffeination facility is based in Canada and so therefore the beans must be transported large distances – especially when bringing them to Australia – the process does not seem very energy efficient. Presumably, a lot of water is also used. There are various online debates as to whether this is the most sustainable process for coffee decaffeination. Read here and here for more on decaffeination. Carbon Filtering Carbon filtering uses activated carbon, which is a form of carbon (usually derived from charcoal) that is extremely porous. This gives it a very large surface area, which can adsorb contaminants in the water. Note that adsorption is different to absorption. Adsorption is the bonding of material onto the surface of another material by intermolecular forces – that is, it gets stuck on the surface. Absorption is the incorporation of one substance into another – that is, one substance penetrates the interior of the other. One gram of activated carbon has a surface area around 500 m2, and this incredible surface area means that a large amount of contaminant material can accumulate on the surface. Carbon filters are good at pulling organic compounds like caffeine out of water. As the flavour-compounds are also organic, the carbon filters used here need to be caffeine specific. To do this, the carbon filter is coated in a caffeine-specific solvent layer. According to patent 4324840, this coating could consist of petroleum oils, triglycerides, fatty acids, fatty alcohols and other water-immiscible materials. This is dissolved up in hexane, which is then piped through the carbon-filter. The hexane, being volatile, then evaporates away leaving the filter coated in a caffeine-specific adsorption layer. When you think about it, it's hardly chemical free!

Manuel Terron is a celebrity chef with the Lifestyle Channel program Mixing with the Best - he is described as a Mixologist, writer and bar consultant, and has been working in the bar/cocktail industry for 17 years. He's also described as sultry and I know my better half certainly had an eye on him.... Manuel ran an event called The Science of Cocktails during the Ultimo Science Festival. It was a fantastic event, and apart from learning how to make margaritas and martinis, Manuel took us on the cocktail making journey, explaining why making cocktails has far more to do with the scientific method than it does a random artistic process. He also explained why some drinks pick you up (tequila), others make you angry (rum), and some can clear the mind (absinthe) - as well as the science of mixology - why some alcohols mix well and other's don't. This is largely due to the interplay of the various tastes (sweet, sour, bitter, salt, umami) and the smell of the drink. And what exactly is a molecular cocktail? To find out more, have a listen to my chat with Manuel after the event. A couple of cocktails makes for a very smooth interview! Listen to this podcast here: Read more on the event over at 10daysofscience.

Jon Lomberg is one of the world's most distinguished space-artists. Lomberg was Carl Sagan's principal artistic collaborator for more than twenty years and in 1998, the International Astronomical Union officially named Asteroid Lomberg in his honour. In 1972, Sagan asked Lomberg to illustrate The Cosmic Connection, after which they worked on NASA's interstellar Voyager Golden Record, a record included in the two 1977 Voyager spacecraft. It contains sounds and images that portray the various life forms and cultures on Earth. The record is intended for any intelligent extraterrestrial life that may find it. It also contains information about our mathematics and science, as well as a way of decoding the record. As aliens may not see colours as we do, if they see at all, a method of decoding the information was included in the spacecraft, as well as an explanation of mathematics from its most simplistic level - one dot means the number one, two dots mean two, etc. From this point you can denote addition, multiplication and so on. The Voyager spacecraft are not heading towards any particular star, and Lomberg thinks that as the craft are unlikely to crash into a planet, if they are spotted, it will be by alien life that has mastered interstellar travel. Lomberg also designed the original cover art for Sagan's novel Contact, and the opening sequence for the Contact film. Lomberg gave a talk at the Ultimo Science Festival and I was lucky enough to grab him for a chat afterwards. Listen to this podcast here: For some more information on Jon, check out his website and have a read of the 10daysofscience story of his recent meeting with 1999 Young Australian of the Year, astronomer Professor Bryan Gaensler. This is a lovely story - Gaensler just happened to be sitting next to Lomberg at the Eureka Awards, and also had a tutorial scheduled for the next day on the challenges of portraying science and astronomy in film, using Contact as his primary example. Naturally, Gaensler asked Lomberg, “What are you doing at noon tomorrow?” See the 10daysofscience story for more information and videos from the tutorial. To get you in the mood, here is the opening sequence for the movie Contact (on youtube here if you can't see the embed). It takes the journey of a spacecraft starting at Earth and hearing the sounds that Earth is currently pumping out into the Universe in the form of radio waves. As we pan out from Earth and journey further and further away, we hear older and older sounds to represent the idea that the sounds broadcast by the first radios are still travelling through the Universe - the further away we go, the older the music sounds, until we have left the solar system, and then the galaxy.

Arts et créations artistiques. Artisticlip permet aux particuliers de diffuser leurs créations artistiques : des vidéos de petites tailles comme des pubs ou des animations, des dessins, des photographies, des clips audios ou encore tout autre type de média.Site web : http://www.artisticlip.comAuthor: goubin Tags: vidéos art dessins photos animationsaudio clips création artistique diffusion musique Posted: 24 August 2009 Rating: 0.0 Votes: 0

This week's podcast celebrates the start of the Ultimo Science Festival - ten days and nights of science fun for families, schools, and people of all ages. The festival is presented by the Powerhouse Museum, the Australian Broadcasting Corporation, The University of Technology Sydney and TAFE NSW. It runs mainly in the Ultimo precinct near Central Station and Harris St - see the map on Google maps here. Most events are free and held from Friday August 21 through to Sunday August 30, 2009. In this show, I chat to Festival Director Tilly Boleyn about how the festival started, what to expect, and what fun can be had. Some of the events we chatted about include Why the mind matters, The Dark Side of Science, Mathematics and Sex, The Science of Cocktails, and The Science of Coffee. I also chat to Jacqui Hayes from Cosmos Magazine about the Hello From Earth project. The project collects text messages on its website to send to Gliese 581d which is an exoplanet, or extrasolar planet, which means it is in orbit around a star other than the Sun. The Gliese 581 system is thought to be one of the best candidates for life outside our Solar System of the more than 350 systems with exoplanets so far discovered. Listen to this podcast here: After message collection closes on Monday 24 August 2009 - hurry!! - all the messages will be collected as a text file and sent to NASA's Jet Propulsion Laboratory, where it will be encoded into binary code. This system of beeps and pauses will be sent back to the Canberra Deep Space Communication Complex at Tidbinbilla, near Canberra. The signal will reach the solar system of Gliese 581 around December 2029 having travelled 20.3 light-years (192 trillion km). The soonest we could hope to receive an answer is in 42 years time in 2051. For more on the technical details, check out the Hello From Earth homepage. And check out the following youtube video: To read more on National Science Week and the Ultimo Science Festival, see our recent blog post on the topic. Hope to see you at the Festival!

Voici comment regarder gratuitement sa TV sur un iTouch ou un iPhone depuis un Hotspot FreeWifi (Parisien).Author: ptitchauve Tags: vodobox iphone ipod touch itouch stream diffusion streaming video webcam television tnt imobilecinema jailbreak hotspot freewifi Posted: 19 August 2009 Rating: 5.0 Votes: 2

Demonstration VODOBOX Flash Server (Prototype A) on iPod Touch 2G with OS 3.0 Jailbreak - streaming source : tuner TV TNT from Windows PC | French site : http://www.vodobox.c.laAuthor: PapaL0c0 Tags: vodobox iphone ipod touch itouch stream diffusion streaming video webcam television tnt imobilecinema jailbreak Posted: 16 August 2009 Rating: 0.0 Votes: 0

Une chanson inédite d'Amazigh Kateb, ex-leader du groupe Gnawa Diffusion.Lien : www.zoom-algerie.comAuthor: zoom-algerie Tags: amazigh kateb gnawa diffusion algérie algérien algérienne alger sahara sahraoui maroc liberté justice élections présidentielle musique révolution chanson engagée Posted: 07 August 2009 Rating: 0.0 Votes: 0

Professor George Wolfe discusses simple and facilitated diffusion in this video from Thinkwell's online Biology series.

Join us and our special guest host Reverend Deacon Delbert P. Fike to learn three secrets of making yourself and friends look glorious in pictures.Submit your photos for critique by Lord God King Kram a.k.a. Mark Colman at colemanpix at yahoo dot com.

http://jasoneppink.com/campfire Twenty-First Century Campfire is an aleatoric light sculpture intended for collective viewing in quiet, low-light, intimate spaces. The Campfire consists of a rescued television set topped by a protruding matrix of PVC pipe that diffuses live television broadcasts into a shifting array of rich colors and abstract shapes. These heavily-researched and targeted messages of consumption -- all provided free of charge by unwitting corporate collaborators -- are filtered into abstraction simply by scattering them inside the PVC piping, rendering the process entirely transparent to the curious observer. The work is intended to be experienced, like an actual campfire, at the center of a small gathering of seated viewers in a dark space. Situated accordingly, the installation becomes a space to be quiet, to meditate, to think, and to sit with others without the constant pressure to sustain conversation. When there is nothing to be said, the Campfire is a returning point, encouraging collective silence and shared meaningful moments of introspection. Ultimately, Twenty-First Century Campfire is an attempt to rescue one of our most deeply ingrained instincts -- the need to sit with others around a glowing source of light -- from the homogenizing three-act structure and the corporate consumption agenda.

This episode of 4 Minute examines the many uses of gels, the appropriate times to use diffusion, your mom, and placement of your lights. After watching this episode you should be able to light your movies like the Sun lights our planet Earth. OUCH! You're burning my skin!!!!