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Academic literature on the topic 'Clock-transitions'

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Published: 10 March 2023

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Journal articles on the topic "Clock-transitions"

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Jukes, Thomas H. "Transitions, transversions, and the molecular evolutionary clock." Journal of Molecular Evolution 26, no. 1-2 (November 1987): 87–98. http://dx.doi.org/10.1007/bf02111284.

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Wynands, R., R. Schroder, and S. Weyers. "Majorana Transitions in an Atomic Fountain Clock." IEEE Transactions on Instrumentation and Measurement 56, no. 2 (April 2007): 660–63. http://dx.doi.org/10.1109/tim.2007.891116.

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Wolfowicz, Gary, Alexei M. Tyryshkin, Richard E. George, Helge Riemann, Nikolai V. Abrosimov, Peter Becker, Hans-Joachim Pohl, Mike L. W. Thewalt, Stephen A. Lyon, and John J. L. Morton. "Atomic clock transitions in silicon-based spin qubits." Nature Nanotechnology 8, no. 8 (June 23, 2013): 561–64. http://dx.doi.org/10.1038/nnano.2013.117.

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BENDIX, CLAIRE, JUAN M. MENDOZA, DESIREE N. STANLEY, ROBERT MEELEY, and FRANK G. HARMON. "The circadian clock-associated genegigantea1affects maize developmental transitions." Plant, Cell & Environment 36, no. 7 (February 28, 2013): 1379–90. http://dx.doi.org/10.1111/pce.12067.

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GIRAUD, MATHIEU, PHILLIPE VEBER, and DOMINIQUE LAVENIER. "PATH-EQUIVALENT DEVELOPMENTS IN ACYCLIC WEIGHTED AUTOMATA." International Journal of Foundations of Computer Science 18, no. 04 (August 2007): 799–811. http://dx.doi.org/10.1142/s012905410700498x.

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Weighted finite automata (WFA) are used with FPGA accelerating hardware to scan large genomic banks. Hardwiring such automata raises surface area and clock frequency constraints, requiring efficient ∊-transitions-removal techniques. In this paper, we present bounds on the number of new transitions for the development of acyclic WFA, which is a special case of the ∊-transitions-removal problem. We introduce a new problem, a partial removal of ∊-transitions while accepting short chains of ∊-transitions.
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Vuilleumier, Robin, Laurence Besseau, Gilles Boeuf, Aurélien Piparelli, Yoav Gothilf, Walter G. Gehring, David C. Klein, and Jack Falcón. "Starting the Zebrafish Pineal Circadian Clock with a Single Photic Transition." Endocrinology 147, no. 5 (May 1, 2006): 2273–79. http://dx.doi.org/10.1210/en.2005-1565.

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The issue of what starts the circadian clock ticking was addressed by studying the developmental appearance of the daily rhythm in the expression of two genes in the zebrafish pineal gland that are part of the circadian clock system. One encodes the photopigment exorhodopsin and the other the melatonin synthesizing enzyme arylalkylamine N-acetyltransferase (AANAT2). Significant daily rhythms in AANAT2 mRNA abundance were detectable for several days after fertilization in animals maintained in a normal or reversed lighting cycle providing 12 h of light and 12 h of dark. In contrast, these rhythms do not develop if animals are maintained in constant lighting or constant darkness from fertilization. In contrast to exorhodopsin, rhythmicity of AANAT2 can be initiated by a pulse of light against a background of constant darkness, by a pulse of darkness against a background of constant lighting, or by single light-to-dark or dark-to-light transitions. Accordingly, these studies indicate that circadian clock function in the zebrafish pineal gland can be initiated by minimal photic cues, and that single photic transitions can be used as an experimental tool to dissect the mechanism that starts the circadian clock in the pineal gland.
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Lewis, Sina G., Kori E. Smyser, and Joel D. Eaves. "Clock transitions guard against spin decoherence in singlet fission." Journal of Chemical Physics 155, no. 19 (November 21, 2021): 194109. http://dx.doi.org/10.1063/5.0069344.

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Wolfowicz, Gary, Alexei M. Tyryshkin, Richard E. George, Helge Riemann, Nikolai V. Abrosimov, Peter Becker, Hans-Joachim Pohl, Mike L. W. Thewalt, Stephen A. Lyon, and John J. L. Morton. "Erratum: Atomic clock transitions in silicon-based spin qubits." Nature Nanotechnology 8, no. 11 (November 2013): 881. http://dx.doi.org/10.1038/nnano.2013.218.

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Yudin, V. I., A. V. Taichenachev, M. Yu Basalaev, T. Zanon-Willette, T. E. Mehlstäubler, R. Boudot, J. W. Pollock, M. Shuker, E. A. Donley, and J. Kitching. "Combined error signal in Ramsey spectroscopy of clock transitions." New Journal of Physics 20, no. 12 (December 18, 2018): 123016. http://dx.doi.org/10.1088/1367-2630/aaf47c.

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Siegert, M., and H. U. Everts. "Layering transitions in the chiral clock model: Bethe approximation." Journal of Physics A: Mathematical and General 22, no. 1 (January 7, 1989): 117–28. http://dx.doi.org/10.1088/0305-4470/22/1/018.

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Dissertations / Theses on the topic "Clock-transitions"

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De, Arpan. "Circadian clock regulation of epithelial-mesenchymal and mesenchymal-epithelial transitions in glioma and breast cancer cells." Bowling Green State University / OhioLINK, 2019. http://rave.ohiolink.edu/etdc/view?acc_num=bgsu1566494866910786.

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Santanni, Fabio. "Molecular approaches for the optimization of electron spin-based quantum bits and quantum logic gates." Doctoral thesis, 2022. http://hdl.handle.net/2158/1262928.

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This work highlights the different possibilities given by a rational chemical approach to obtain molecular-based quantum bits and quantum logic gates as an appealing and alternative platform for implementing quantum computation. This work resumes the three years of the author's work on this subject, mainly presenting and focusing on experimental results obtained for some new potential hydrogen-free molecular qubits, multi-qubit structures, and state-of-the-art EPR-based (Electron Paramagnetic Resonance) experiments on an archetypical vanadyl-based qubit.
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Mitterboeck, T. Fatima. "Consequences of Insect Flight Loss for Molecular Evolutionary Rates and Diversification." Thesis, 2012. http://hdl.handle.net/10214/3679.

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This thesis investigates the molecular evolutionary and macroevolutionary consequences of flight loss in insects. Chapter 2 tests the hypothesis that flightless groups have smaller effective population sizes than related flighted groups, expected to result in a consistent pattern of increased non-synonymous to synonymous ratios in flightless lineages due to the greater effect of genetic drift in smaller populations. Chapter 3 tests the hypothesis that reduced dispersal and species-level traits such as range size associated with flightlessness increase extinction rates, which over the long term will counteract increased speciation rates in flightless lineages, leading to lower net diversification. The wide-spread loss of flight in insects has led to increased molecular evolutionary rates and is associated with decreased long-term net diversification. I demonstrate that the fundamental trait of dispersal ability has shaped two forms of diversity—molecular and species—in the largest group of animals, and that microevolutionary and macroevolutionary patterns do not necessarily mirror each other.
Generously funded by NSERC with a Canada Graduate Scholarship and the Government of Ontario with an Ontario Graduate Scholarship to T. Fatima Mitterboeck; NSERC with a Discovery Grant to Dr. Sarah J. Adamowicz
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Books on the topic "Clock-transitions"

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Builder, Carl H. Winding the universal clock: Speculations on the transitions between chaos and order. Santa Monica, CA: Rand, 1997.

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King, David R. Monte Carlo study of the phase transitions for the 3-dimensional 4- and 6-state chiral clock models. 1993.

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Book chapters on the topic "Clock-transitions"

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Sharpe*, Susan C., Laura Eme*, Matthew W. Brown, and Andrew J. Roger. "Timing the Origins of Multicellular Eukaryotes Through Phylogenomics and Relaxed Molecular Clock Analyses." In Evolutionary Transitions to Multicellular Life, 3–29. Dordrecht: Springer Netherlands, 2015. http://dx.doi.org/10.1007/978-94-017-9642-2_1.

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Conference papers on the topic "Clock-transitions"

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Chen, Bo-Wei, Tze-Wei Liu, Hsin-Hung Yu, and Wang-Yau Cheng. "New type of frequency standard transitions realized by comb laser." In CLEO: Applications and Technology. Washington, D.C.: Optica Publishing Group, 2022. http://dx.doi.org/10.1364/cleo_at.2022.jth3a.23.

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The clock transitions recommended by BIPM are never realized by a femtosecond comb laser. In this report, we recommend two comb-laser-based stepwise transitions resolved simultaneously from rubidium and cesium atom.
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Witkowski, M., R. Ciurylo, A. Gogyan, A. Linek, R. Munoz Rodriguez, P. Tecmer, and M. Zawada. "New Physics Searches with Isotope Shifts of Two Hg Clock Transitions." In 2022 Joint Conference of the European Frequency and Time Forum and IEEE International Frequency Control Symposium (EFTF/IFCS). IEEE, 2022. http://dx.doi.org/10.1109/eftf/ifcs54560.2022.9850819.

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Tregubov, D., A. Golovizin, E. Fedorova, D. Mishin, D. Provorchenko, K. Khabarova, V. Sorokin, and N. Kolachevsky. "Elimination of second-order Zeeman shift in thulium optical clock by simultaneous interrogation of two clock transitions." In CLEO: Applications and Technology. Washington, D.C.: OSA, 2021. http://dx.doi.org/10.1364/cleo_at.2021.jth3a.82.

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Leopardi, Holly, Josue Davila-Rodriguez, Jeff Sherman, Franklyn Quinlan, Scott Diddams, and Tara Fortier. "Absolute frequency comb comparisons and the measurement of optical atomic clock transitions." In CLEO: Science and Innovations. Washington, D.C.: OSA, 2018. http://dx.doi.org/10.1364/cleo_si.2018.sm1l.4.

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Il'enkov, R. Ya, A. V. Taichenachev, V. I. Yudin, and O. N. Prudnikov. "Kinetics of atoms cooled on clock transitions: Behavior of energy and momentum." In 2018 European Frequency and Time Forum (EFTF). IEEE, 2018. http://dx.doi.org/10.1109/eftf.2018.8409070.

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Constantin, Florin Lucian. "Towards Probing a Variation of Fundamental Constants with Optical Clock Transitions of 127I2." In 2020 Joint Conference of the IEEE International Frequency Control Symposium and International Symposium on Applications of Ferroelectrics (IFCS-ISAF). IEEE, 2020. http://dx.doi.org/10.1109/ifcs-isaf41089.2020.9234878.

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Rolston, S. L., and W. D. Phillips. "Metastable xenon: a new optical clock." In OSA Annual Meeting. Washington, D.C.: Optica Publishing Group, 1990. http://dx.doi.org/10.1364/oam.1990.pdp7.

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The possibility of a neutral atom-based "ultimate" frequency standard in the optical domain has improved dramatically with the discovery of sub-Doppler cooling mechanisms. Unfortunately, the atoms with clock transitions of order 1 Hz that have been identified will be extremely difficult to laser cool. We have identified a two-photon transition in metastable xenon (3P2→3P0) at 2.19 microns with a calculated linewidth of 2 Hz. Metastable xenon can be laser-cooled with a cycling transition at 882 nm, convenient for Ti:sapphire lasers, with cooling parameters almost identical to cesium. Expected temperatures should be about 3 microkelvin, which will allow a fountain to be constructed that has little loss of signal due to spatial spreading of the atoms. After making the 2-photon clock transition, the atoms that are in the 3P0 metastable state can be detected with high efficiency with a metastable detector. Atoms in the lower metastable state can be completely removed by applying small amounts of diode laser light at 828 nm to drive atoms into the ground state, allowing high efficiency, essentially background-free detection. Two-photon transition rates and AC stark shifts have been calculated and will be presented. Possible laser sources for the clock transition will be discussed, as well as a connection from this optical frequency to the microwave.
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Cheung, Charles, Andrey Bondarev, Ilya Tupitsyn, Mikhail Kozlov, Sergey Porsev, and Marianna Safronova. "ACCURATE PREDICTION OF CLOCK TRANSITIONS IN A HIGHLY CHARGED ION WITH COMPLEX ELECTRONIC STRUCTURE." In 2020 International Symposium on Molecular Spectroscopy. Urbana, Illinois: University of Illinois at Urbana-Champaign, 2020. http://dx.doi.org/10.15278/isms.2020.mh03.

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Cheung, Charles, Andrey Bondarev, Ilya Tupitsyn, Mikhail Kozlov, Sergey Porsev, and Marianna Safronova. "ACCURATE PREDICTION OF CLOCK TRANSITIONS IN A HIGHLY CHARGED ION WITH COMPLEX ELECTRONIC STRUCTURE." In 2021 International Symposium on Molecular Spectroscopy. Urbana, Illinois: University of Illinois at Urbana-Champaign, 2021. http://dx.doi.org/10.15278/isms.2021.rb08.

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Taichenachev, A. V., V. I. Yudin, C. W. Oates, and L. Hollberg. "Magnetic Field-Induced Spectroscopy of Optical Clock Transitions in an Elliptically Polarized Lattice Field." In CLEO 2007. IEEE, 2007. http://dx.doi.org/10.1109/cleo.2007.4452554.

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