فارسي | English
  About Us | About Iran | Contact Us | Staff Info[Geoportal Info] [Maps] [Mining Info] [Other Activities]  
 
  News | Events | Photo Gallery | Downloads | Links | Kids  Search    Region    Scale    Subject   :Access to information by   Home | Newest   
 

News Comment
 
Geology
2017/05/16
NGDIR News Section-- Einstein's theory of gravity, also referred to as General Relativity, predicts that a rotating body such as the Earth partially drags inertial frames along with its rotation. In a study recently published in EPJ Plus, a group of scientists based in Italy suggests a novel approach to measuring what is referred to as frame dragging. Angela Di Virgilio of the National Institute of Nuclear Physics, INFN, in Pisa, Italy, and her colleagues propose using the most sensitive type of inertial sensors, which incorporate ring lasers as gyroscopes, to measure the absolute rotation rate of the Earth.
  
   The experiment aims to measure the absolute rotation with respect to the local inertial frame, which is what is referred to as frame dragging. In principle, the ring laser should show one rotation around the Earth's axis every 24 hours. However, should observation by reference to fixed stars in the sky show a slightly different rate of rotation, the difference can be attributed to frame dragging.
  
   The authors' proposed experiment, called GINGER, requires two ring lasers to provide a reference measurement. It suggests comparing experimental GINGER data with the kinetic Earth rotation rate independently measured by the International Earth Rotation System Service (IERS). According to the authors, their proposed solution can accurately test the frame dragging effect at 1%.
  
   This is a vast improvement compared to previous experiments, such as the 2011 Stanford Gyroscope Experiment, Gravity Probe B (GPB), which agreed with General Relativity's prediction for the frame dragging with an estimated 19% margin of error. Or the 2016 measurement of the dragging of the plane of an orbiting satellite, using laser ranged satellites like the satellite LARES, which boasted a 5% margin of error. The authors expect that, ultimately, the satellite-based approach could even deliver accuracy below the 1% error measurement threshold.
  
   By Springer

 
 
Publications  Library
Glossary  Papers
 
 
 
 
FAQ  Members
Job Offer  Training
 
 
 
 
• NanoBioEarth Database 
• Medical Geology Database 
• Geological Atlas of Roads 
• 4th National Development Plan 
• Marine Geology 
• Geography information 
• Mines and Deposits of Iran 
• Landslide Database of Iran 
• Exploration Area DB 
• Copper Database 
• Gold Database  
• Geoscience Laboratories 
• Mineral Information 
• Bibliographic Database 
• Geochemistry Database 
• Earthquake database 
• Abandoned mines DB of Iran 
• Mineral processing database 
• Minerals database 
 
 
 
 
Login Name:
Password:
Sign Up for membership ]
 
 
 
   Others Activities:• Geo Hazard Of South Caspian • Geoscience database of ALBA • Geoscience Database of ECO 
• GEOLOGICAL SURVEY OF IRAN • Tajikistan Geoscience Database • Geo Database of Venezuela • 4th National Development Plan 
• Export & Import Regulation Act     
 
 
Maps:• Map of Iran's Last Earthquake • Distribution Map of mineral Processing Plants 
• Mineral Distribution Map of Iran • Geosciences laboratories distribution map of Iran • Orohydrographic Map of Iran 
• Select state on iran map • Geological Map of Iran(1:1000, 000 Scale) • 2500 K Magnetic Lineament Map of Iran 
• Map of Iran's Earthquake    
 
Best viewed:1024*768
National Geoscience Database Of IRAN
URL:www.ngdir.ir
Contact Mail:Info@ngdir.ir
 
 
 Search with:           
Designed by Payvand Software Group  Privacy | Copyright | Disclaimer