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آخرينبعدي
  1396/09/29
   Govt electricity supply report 'will not save US coal'
  NGDIR News Section-- In April, US energy secretary Rick Perry tasked researchers at the DOE to produce a report on electricity markets and grid reliability. Given the White House's call to "bring back coal", renewable energy backers did not bother to wait for the findings to criticize the report. The green lobby needn't have worried. The final report published a week ago gives coal miners little to cheer about. The decline of coal-fired electricity generation in the US- at just 30% of t.....[More]
  1396/09/20
   The Legacy of the 1992 Nicaragua Tsunami
  NGDIR News Section-- A powerful tsunami struck Nicaragua's Pacific coast 25 years ago. In its wake emerged the first coordinated collaboration among international tsunami scientists. On the night of 1 September 1992, a deadly tsunami struck the Pacific coast of Nicaragua with little or no warning, triggered by a nearby earthquake. Early newspaper reports indicated waves almost 15 meters high swept away houses, boats, vehicles, and anything in their path [Globe and Mail, 1992]. The earthqua.....[More]
  1396/09/19
   How friction evolves during an earthquake (By simulating quakes in a lab, engineers study the way that friction changes along a fault during a seismic event)
  NGDIR News Section-- Using high-speed photography and digital image correlation techniques, engineers show that friction along a faultline has a complex evolution during an earthquake that is dictated, in part, by slip velocity: the sliding of the two sides of the fault against one another. By simulating earthquakes in a lab, engineers at Caltech have documented the evolution of friction during an earthquake -- measuring what could once only be inferred, and shedding light on one of the bigge.....[More]
  1396/09/18
   USGS on Fire: It's not a matter of
  NGDIR News Section-- It was a catastrophic, often heartbreaking equation at work in northern California these last few months: dryness or drought + vegetation + hotter temperatures + wind = wildfire. Wine country residents had little warning when wildfires ignited early October, late on a Sunday night, rapidly spreading with wind gusts as high as 50 miles per hour. A 5-year drought left the region parched. And last winter's heavy rains, though a welcome relief, kick-started abundant vegetatio.....[More]
  1396/09/13
   Ancient Earth's hot interior created 'graveyard' of continental slabs
  NGDIR News Section-- Plate tectonics has shaped the Earth's surface for billions of years: Continents and oceanic crust have pushed and pulled on each other, continually rearranging the planet's facade. As two massive plates collide, one can give way and slide under the other in a process called subduction. The subducted slab then slips down through the Earth's viscous mantle, like a flat stone through a pool of honey. For the most part, today's subducting slabs can only sink so far, to about.....[More]
  1396/09/12
   Supervolcanoes: A key to America's electric future?
  NGDIR News Section-- Researchers show that lake sediments preserved within ancient supervolcanoes can host large lithium-rich clay deposits. A domestic source of lithium would help meet the rising demand for this valuable metal, which is critical for modern technology. Most of the lithium used to make the lithium-ion batteries that power modern electronics comes from Australia and Chile. But Stanford scientists say there are large deposits in sources right here in America: supervolcanoes. .....[More]
  1396/09/11
   USGS publishes a new blueprint that can help make subduction zone areas more resilient
  NGDIR News Section-- Subduction zone events pose significant threats to lives, property, economic vitality, cultural and natural resources and quality of life. The tremendous magnitudes of these events are unique to subduction zones, and they can have cascading consequences that reverberate around the globe. The planet we live on is constantly shifting beneath our feet. Creeping along at speeds undetectable to you and me, Earth's massive tectonic plates are continually on the move, and nowh.....[More]
  1389/11/06
   Loss of Reflectivity in the Arctic Doubles Estimate of Climate Models
  NGDIR News Section-- A new analysis of the Northern Hemisphere's "albedo feedback" over a 30-year period concludes that the region's loss of reflectivity due to snow and sea ice decline is more than double what state-of-the-art climate models estimate. The findings are important, researchers say, because they suggest that Arctic warming amplified by the loss of reflectivity could be even more significant than previously thought. The study was published online this week in Nature Geoscience.....[More]
  1389/11/04
   WISE Beholds a Pair of Dancing Galaxies
  NGDIR News Section--WISE Beholds a Pair of Dancing Galaxies-- This image from NASA's Wide-Field Infrared Survey Explorer, or WISE, features two stunning galaxies engaged in an intergalactic dance. The galaxies, Messier 81 and Messier 82, swept by each other a few hundred million years ago, and will likely continue to twirl around each other multiple times before eventually merging into a single galaxy. The relatively recent encounter triggered a spectacular burst of star formation visible in bot.....[More]
  1389/11/04
   How Do Diamonds Form?
  NGDIR News Section-- Accoring to ScienceDaily, Contrary to what many people believe, most diamonds do not form from coal. Methods of Diamond Formation Many people believe that diamonds are formed from the metamorphism of coal. That idea continues to be the "how diamonds form" story in many science classrooms. Coal has rarely played a role in the formation of diamonds. In fact, most diamonds that have been dated are much older than Earth's first land plants - the source material of coa.....[More]
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