Tag: luminosity

City Lights Reveals Economic Activity—But Don't Give Up Ledgers Just Yet

By Veronique Greenwood | May 17, 2011 12:41 pm

earthNot so helpful after all.

What’s the News: City lights are more than a pretty sight from the air—they’re also a good way to tell how a country’s economy is doing, some economists say. Over the past decade, deducing a country’s gross domestic product from how much it glows in nighttime satellite images, a factor called luminosity, has become quite the econ fad. But as clever as it sounds, luminosity isn’t as helpful as you’d think, a new study says. Only in countries that are such a disaster that gathering reliable statistics is impossible is the glow a better approximation of GDP than you’d get with traditional measures.

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CATEGORIZED UNDER: Physics & Math, Technology

LHC Sets a New Personal Record: 10,000 Particle Smash-Ups per Second

By Joseph Calamia | June 28, 2010 12:05 pm

lhc-tunnelAs a younger stronger particle smasher, the Large Hadron Collider can turn even baby steps into new records. Over this past weekend, the LHC beat another personal best–colliding its most protons yet at 10,000 particle collisions per second (about double its earlier rate). Physicists believe this is a crucial step on the collider’s hunt for new physics.

In November of 2009, the LHC collided its first protons as it started its quest to find the suspected mass-giving particle known as the Higgs Boson. The collider is still running at half of its designed maximum energy, but after this weekend, the number of particles per bunch traveling in the ring is just what physicists had planned. This is essential, says CERN physicist John Ellis:

“Protons are complicated particles, they’ve got quarks, [and other small particles], and colliding them is like colliding two garbage cans and watching carrots come out…. The more collisions we get, the closer we get to supersymmetry, dark matter, the Higgs boson and other types of new physics.” [BBC]

Here are some basics:

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CATEGORIZED UNDER: Physics & Math
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