LPO (Ligue pour la Protection des Oiseaux) Earth economist: The food bubble is about to burst - environment - 10 February 2011 We're fast draining the fresh water resources our farms rely on, warns Lester Brown, president of the Earth Policy Institute What is a food bubble? That's when food production is inflated through the unsustainable use of water and land. It's the water bubble we need to worry about now. The World Bank says that 15 per cent of Indians (175 million people) are fed by grain produced through overpumping - when water is pumped out of aquifers faster than they can be replenished. Has this bubble already burst anywhere? Saudi Arabia made itself self-sufficient in wheat by using water from a fossil aquifer, which doesn't refill. With population rising, a fall in grain production would spell big trouble. Yes. What will happen if we carry on as we are now? Civilisation as we know it can't withstand the stresses of continuing with business as usual. How can we avert a disaster like this? In many countries, irrigation water is free or comes at a low price, so it's treated as an abundant resource. Profile
Comb filter In signal processing, a comb filter adds a delayed version of a signal to itself, causing constructive and destructive interference. The frequency response of a comb filter consists of a series of regularly spaced spikes, giving the appearance of a comb. Applications[edit] Comb filters are used in a variety of signal processing applications. These include: In acoustics, comb filtering can arise in some unwanted ways. Technical discussion[edit] Comb filters exist in two different forms, feedforward and feedback; the names refer to the direction in which signals are delayed before they are added to the input. Comb filters may be implemented in discrete time or continuous time; this article will focus on discrete-time implementations; the properties of the continuous-time comb filter are very similar. Feedforward form[edit] Feedforward comb filter structure The general structure of a feedforward comb filter is shown on the right. where is the delay length (measured in samples), and . . , giving . .
Tips: Mastering Audio and Music FAQ What is mastering? Mastering is the final step in the recording process, where all the songs are checked for errors and the album is prepared for retail sale. This preparation can include a number of things, but usually involves some sort of additional processing (or "sweetening" as many places like to call it) in order to make songs sound clearer and better. What do I bring to mastering? If you plan on taking your mixes to an outside source to get them mastered, ask them what formats they accept. NOTE: If you do plan on sending your songs to outside mastering, do NOT: 1) Add extra compression/EQ on the final mix...let the mastering engineer do this...it's what you're paying them for. 2) Try to do any sort of normalizing...once again let the engineer handle this, give them some headroom to work with. If you're just trying to give your engineer an idea of how you want to sound make them a separate set of your mixes and send them along with your untouched mixes. How much does mastering cost?
Five Must-Have Collaboration Tools for Freelancers and Small Businesses Gone are the days when you needed your own server for collaborative work between colleagues. Today, it’s possible to create an entire business on subscription plans and free collaboration tools that help you do everything you need with minimal effort and maximum reliability. This has already led to the creation of virtual offices all over the world – the open source ecosystem being one of the biggest and most successful examples of this. In fact, if you’ve started your own small venture with personal money, it only makes good business sense to set up everything with as little cost as possible while keeping in mind the quality and reliability aspect. To give you an idea, here are the different types of applications that any business can use in order to manage things between remote employees: Project Management This is definitely the most important category of tool to have unless you’re a single individual working for yourself. ]project-open[ BaseCamp Document Management and Collaboration
40 Breathtaking Photos from National Geographic Contest - Noupe Design Blog Mar 31 2010 The National Geographic has been known for bringing awareness about natural resources and the planet since 1888. It has been educating people and has been the largest non-profitable scientific organization that inspired millions of people to pay closer attention to their environment. In this post, we are going to share some stunning photographs from The National Geographic’s Annual International Photography Contest, as well as showcasing some really beautiful wallpapers from National Geographic collections. We hope that you’ll like this collection — please share your opinion with us. National Geographic Contest Photos By Yusuke Okada, JapanA manatee photographed in Florida By Cesare Naldi, United StatesNazroo, a mahout (elephant driver), poses for a portrait while taking his elephant, Rajan, out for a swim in front of Radha Nagar Beach in Havelock, Andaman Islands. By Hugo Machado, PortugalLicancabur volcano is located on the border between Chile and Bolivia.
Yosemite Panorama Pictures Hetch Hetchy Reservoir Half Dome Cable Route On the hike to Half Dome Flat Half Dome Summit Looking from Half Dome Summit into the Main Valley (Glacier Point, Sentinel Dome, El Cap visible) Looking from Half Dome into Tenaya Canyon (left) and Little Yosemite Valley (right) Back of Half Dome (left), Liberty Cap (middle) and Nevada Falls from Panorama Trail Glaciert Point (left) and Half Dome (right) from Panorama Trail Panorama from Glacier Point (Half Dome, Nevada and Vernal Falls) Glacier Point (Half Dome and Tenaya Canyon) Liberty Cap and Nevada Falls Mono Pass Parker Pass Lower Cathredal Lake Upper Cathredal Lake Panorama from Sentinel Dome
Staples Art Un superbe travail de l’artiste français Baptiste Debombourg créant des œuvres d’art très impressionnantes avec l’utilisation de plus de 35 000 agrafes. Des fresques sur mur intitulées Air Force One et Air Force Two. Plus de détails et d’images dans la suite. Birth of the Sun - Zoom Astronomy A Globule of Gas: The Sun, like other stars, was formed in a nebula, an interstellar cloud of dust and gas (mostly hydrogen). These stellar nurseries are abundant in the arms of spiral galaxies (like our galaxy, the Milky Way). In the stellar nursery, dense parts of the clouds undergo gravitational collapse and compress to form a rotating gas globule. The globule is cooled by emitting radio waves and infrared radiation. A Central Core and a Protoplanetary Disk: As the collapse proceeds, the temperature and pressure within the globule increases, as the atoms are in closer proximity. Protostar: The contracting cloud heats up due to friction and forms a glowing protostar; this stage lasts for roughly 50 million years. A Newborn Star: When a temperature of about 27,000,000°F is reached, nuclear fusion begins at the core of the Sun. Young stars often emit jets of intense radiation that heat the surrounding matter to the point at which it glows brightly. Star Birth Web Links:Star birth from NASA
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