Zobrazeno 1 - 10
of 271
pro vyhledávání: '"Hartnett, John G."'
Autor:
Chappell, James M., Berkahn, David L., Iannella, Nicolangelo, Hartnett, John G., Iqbal, Azhar, Abbott, Derek
In this paper we develop a framework allowing a natural extension of the Lorentz transformations. To begin, we show that by expanding conventional four-dimensional spacetime to eight-dimensions that a natural generalization is indeed obtained. We the
Externí odkaz:
http://arxiv.org/abs/1611.02564
Autor:
Heo, Myoung-Sun, Park, Sang Eon, Lee, Won-Kyu, Lee, Sang-Bum, Hong, Hyun-Gue, Kwon, Taeg Yong, Park, Chang Yong, Yu, Dai-Hyuk, Santarelli, G., Hilton, Ashby, Luiten, Andre N., Hartnett, John G.
In this paper we report on the implementation and stability analysis of a drift-compensated frequency synthesizer from a cryogenic sapphire oscillator (CSO) designed for a Cs/Rb atomic fountain clock. The synthesizer has two microwave outputs of 7 GH
Externí odkaz:
http://arxiv.org/abs/1610.02027
Understanding the nature of time remains a key unsolved problem in science. Newton in the Principia asserted an absolute universal time that {\it `flows equably'}. Hamilton then proposed a mathematical unification of space and time within the framewo
Externí odkaz:
http://arxiv.org/abs/1509.06707
Publikováno v:
IEEE Access , vol.PP, no.99, pp.1-1, 2016
There are a wide variety of different vector formalisms currently utilized in engineering and physics. For example, Gibbs' three-vectors, Minkowski four-vectors, complex spinors in quantum mechanics, quaternions used to describe rigid body rotations
Externí odkaz:
http://arxiv.org/abs/1509.00501
Autor:
Chappell, James M., Hartnett, John G., Iannella, Nicolangelo, Iqbal, Azhar, Berkahn, David L., Abbott, Derek
Publikováno v:
J. Phys. Commun. 7 065001 (2023)
The four dimensional spacetime continuum, as first conceived by Minkowski, has become the dominant framework within which to describe physical laws. In this paper, we show how this four-dimensional structure is a natural property of physical three-di
Externí odkaz:
http://arxiv.org/abs/1501.04857
Publikováno v:
S.R. Parker, J.G. Hartnett, R.G. Povey, and M.E. Tobar, "Cryogenic resonant microwave cavity searches for hidden sector photons," Phys. Rev. D 88, 112004, 2013
The hidden sector photon is a weakly interacting hypothetical particle with sub-eV mass that kinetically mixes with the photon. We describe a microwave frequency light shining through a wall experiment where a cryogenic resonant microwave cavity is u
Externí odkaz:
http://arxiv.org/abs/1410.5244
Publikováno v:
Parker, S.R.; Ivanov, E.N.; Hartnett, J.G., "Extending the Frequency Range of Digital Noise Measurements to the Microwave Domain," Microwave Theory and Techniques, IEEE Transactions on , vol.62, no.2, pp.368,372, Feb. 2014
We describe the use of digital phase noise test sets at frequencies well beyond the sampling rate of their analog-to-digital converters. The technique proposed involves the transfer of phase fluctuations from an arbitrary high carrier frequency to wi
Externí odkaz:
http://arxiv.org/abs/1410.5238
Autor:
Nand, Nitin R., Parker, Stephen R., Ivanov, Eugene N., le-Floch, Jean-Michel, Hartnett, John G., Tobar, Michael E.
We report on the measurement and characterization of power to frequency conversion in the resonant mode of a cryogenic sapphire loaded cavity resonator, which is used as the frequency discriminating element of a loop oscillator circuit. Fluctuations
Externí odkaz:
http://arxiv.org/abs/1307.6078
Autor:
Floch, Jean-Michel Le, Bara, Romain, Hartnett, John G., Tobar, Michael E., Mouneyrac, David, Passerieux, Damien, Cros, Dominique, Krupka, Jerzy, Goy, Philippe, Caroopen, Sylvain
Publikováno v:
JOURNAL OF APPLIED PHYSICS Volume: 109 Issue: 9 Article Number: 094103 Published: MAY 1 2011
Dielectric resonators are key components for many microwave and millimetre wave applications, including high-Q filters and frequency-determining elements for precision frequency synthesis. These often depend on the quality of the dielectric material.
Externí odkaz:
http://arxiv.org/abs/1302.4149
Autor:
Hartnett, John G., Parker, Stephen R., Ivanov, Eugene N., Povey, Travis, Nand, Nitin R., Floch, Jean-Michel le
The phase noise and frequency stability measurements of 1 GHz, 100 MHz, and 10 MHz signals are presented which have been synthesized from microwave cryogenic sapphire oscillators using ultra-low-vibration pulse-tube cryocooler technology. We present
Externí odkaz:
http://arxiv.org/abs/1302.0283