The SIM Time Network allows each of these nations to continuously compare their clocks, with the time differences between the nations displayed on a SIM Web site. These time differences generally are very small, often less than 100 nanoseconds (100 billionths of a second).
It has been said that the world's most commonly asked question is "What time is it?" Nations that maintain accurate time standards benefit all of their residents. Accurate time and synchronization are crucial for much or our modern technology, enabling the efficient operation of telecommunications, computer networks, electric power distribution, and many other parts of the technology infrastructure that we use every day.
The SIM Time Network began in 2005 by adopting technology developed at NIST to more easily distribute accurate time and frequency information to remote locations. NIST developed a self-contained, user-friendly system about the size of a microwave oven that can be quickly installed in any laboratory. One or more atomic clocks then are connected to the automated system, which uses the Internet and the Global Positioning System (GPS) to compare the clocks' time with clocks at other laboratories on the network and report the results to the central servers of the SIM Time Network.
The SIM Time Network initially compared the national time standards among Canada, Mexico and the United States. The network has been rapidly expanding, and now includes time standards in Argentina, Brazil, Chile, Colombia, Costa Rica, Jamaica, Panama, Paraguay, Peru, St. Lucia, Uruguay, Guatemala, and Trinidad and Tobago as well. The time from each nation is measured every second, and the measurements are transferred across the network every 10 minutes and displayed on the Internet. The results are publicly available so that anyone can see in near real-time comparisons between the time standards for all the participating countries.
Michael Lombardi, the NIST scientist who designed the network, says that it has helped several laboratories gain status as the official timekeepers for their respective countries, and several of the SIM Time Network participants also have begun participating for the first time in the generation of official international time—Coordinated Universal Time (UTC)—a sort of weighted average of time kept by official clocks maintained by the International Bureau of Weights and Measures in France (French acronym BIPM).
The SIM Time Network has led to increased cooperation and scientific collaboration among its members. Mauricio Lopez of the Centro Nacional de Metrología (CENAM) of Mexico, who chairs the SIM Time and Frequency Working group, and his staff at CENAM led the development of a project that combines the time kept by all of the clocks in the network and produces an average timescale, called SIM Time (SIMT). The laboratories in the network can then compare their clocks to each other and to SIMT.
To see the SIM Time Network in action, visit http://tf.nist.gov/sim/index.htm (home page) and http://18.104.22.168/scripts/sim_rx_grid.exe (current results display).
James Burrus | EurekAlert!
Stanford researchers create new special-purpose computer that may someday save us billions
21.10.2016 | Stanford University
New 3-D wiring technique brings scalable quantum computers closer to reality
19.10.2016 | University of Waterloo
Terahertz excitation of selected crystal vibrations leads to an effective magnetic field that drives coherent spin motion
Controlling functional properties by light is one of the grand goals in modern condensed matter physics and materials science. A new study now demonstrates how...
Researchers from the Institute for Quantum Computing (IQC) at the University of Waterloo led the development of a new extensible wiring technique capable of controlling superconducting quantum bits, representing a significant step towards to the realization of a scalable quantum computer.
"The quantum socket is a wiring method that uses three-dimensional wires based on spring-loaded pins to address individual qubits," said Jeremy Béjanin, a PhD...
In a paper in Scientific Reports, a research team at Worcester Polytechnic Institute describes a novel light-activated phenomenon that could become the basis for applications as diverse as microscopic robotic grippers and more efficient solar cells.
A research team at Worcester Polytechnic Institute (WPI) has developed a revolutionary, light-activated semiconductor nanocomposite material that can be used...
By forcefully embedding two silicon atoms in a diamond matrix, Sandia researchers have demonstrated for the first time on a single chip all the components needed to create a quantum bridge to link quantum computers together.
"People have already built small quantum computers," says Sandia researcher Ryan Camacho. "Maybe the first useful one won't be a single giant quantum computer...
COMPAMED has become the leading international marketplace for suppliers of medical manufacturing. The trade fair, which takes place every November and is co-located to MEDICA in Dusseldorf, has been steadily growing over the past years and shows that medical technology remains a rapidly growing market.
In 2016, the joint pavilion by the IVAM Microtechnology Network, the Product Market “High-tech for Medical Devices”, will be located in Hall 8a again and will...
14.10.2016 | Event News
14.10.2016 | Event News
12.10.2016 | Event News
25.10.2016 | Life Sciences
24.10.2016 | Earth Sciences
24.10.2016 | Life Sciences