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Researchers uncover importance of aligning biological clocks with day-night cycles（图）
Researchers importance aligning biological clocks day-night cycles
2020/4/17
Timing is everything. A fresh example supporting the old saying has been found in systems regulated by biological clocks. Research on circadian rhythms, internal 24-hour patterns that affect sleep-wak...
JILA’s Superradiant Laser May One Day Boost Atomic Clocks and ‘Rulers’ for Space
JILA Superradiant Laser Atomic Clocks Rulers Space
2016/11/4
JILA physicists have demonstrated a novel laser design based on synchronized emissions of light from the same type of atoms used in advanced atomic clocks. The laser could be stable enough to improve ...
I explore two logical possibilities for the discretization of time, termed ``instantaneous" and ``smeared". These are found by discretizing a continuous theory, and the resulting structure of configur...
Time in the theory of relativity:on natural clocks,proper time,the clock hypothesis,and all that
relativity Einstein natural clock atomic clock proper time clock hyothesis
2016/6/12
When addressing the notion of proper time in the theory of relativity, it is usually taken for granted that the time read by an accelerated clock is given by the Minkowski proper time. However, there ...
Telling time from analog and digital clocks: A multiple-route account
clock time naming conceptual mediation analog clock digital clock
2015/3/31
Does the naming of clocks always require conceptual preparation? To examine this question, speakers were presented with
analog and digital clocks that had to be named in Dutch using either a relative...
Working with a team of scientists from the Technical University of Munich (TU Munich), Brandeis University, and Leiden University in the Netherlands, M. Cristina Marchetti and Mark Bowick, professors ...
HOUSTON – (Jan. 30, 2014) – Plasmonic nanoparticles developed at Rice University are becoming known for their ability to turn light into heat, but how to use them to generate electricity is not nearly...
Einstein's Clocks and Langevin's Twins
Einstein's Clocks Langevin's Twins History and Philosophy of Physics
2012/5/28
In 1905 Einstein presented the Clock Paradox and in 1911 Paul Langevin expanded Einstein's result to human observers, the "Twin Paradox." I will explain the crucial difference between Einstein and Lan...
Rydberg Spectroscopy in an Optical Lattice: Blackbody Thermometry for Atomic Clocks
Rydberg Spectroscopy Optical Lattice Blackbody Thermometry Atomic Clocks
2011/8/17
Abstract: We show that optical spectroscopy of Rydberg states can provide accurate {\em in situ} thermometry at room-temperature. Transitions from a metastable state to Rydberg states with principal q...
Broken chaotic clocks of brain neurons and depression
Broken chaotic clocks of brain neurons depression
2010/12/28
Irregular spiking time-series obtained in vitro and in vivo from singular brain neurons of different types of rats are analyzed by mapping to telegraph signals. Since the neural information is coded i...
Broken chaotic clocks of brain neurons and depression
Broken chaotic clocks brain neurons depression
2011/1/5
Irregular spiking time-series obtained in vitro and in vivo from singular brain neurons of different types of rats are analyzed by mapping to telegraph signals. Since the neural information is coded i...
Measurement of phase synchrony of coupled segmentation clocks
phase synchrony coupled segmentation clocks
2011/1/6
The temporal behaviour of segmentation clock oscillations show phase synchrony via mean field like coupling of delta protein restricting to nearest neighbours only, in a configuration of cells arrange...
Measurement of phase synchrony of coupled segmentation clocks
Delta-notch coupling phase synchrony Hilbert transform
2010/12/28
The temporal behaviour of segmentation clock oscillations show phase synchrony via mean
field like coupling of delta protein restricting to nearest neighbours only, in a configuration
of cells arran...
A New Rb Lamp Exciter Circuit for Rb atomic clocks and Studies on Transition from Ring to Red mode
Rb Lamp Exciter Circuit Rb atomic clocks
2010/11/16
In this paper we describe the development of novel RF exciter circuit for electrode less Rb lamp. The lamp exciter circuit is a RF oscillator with a a new configuration operating at 60 to 65 MHz freq...
Nature's Most Precise Clocks May Make "Galactic GPS" Possible; Pulsing Pulsars Help in Search for Gravitational Waves
Nature's Most Precise Clocks Galactic GPS Pulsing Pulsars Gravitational Waves
2010/1/11
Radio astronomers have uncovered 17 millisecond pulsars in our galaxy by studying unknown high-energy sources detected by NASA's Fermi Gamma-ray Space Telescope. The astronomers made the discovery in ...