Academic literature on the topic 'Timekeeping'

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Journal articles on the topic "Timekeeping"

1

Bartky, Lan R. "Timekeeping." Science 239, no. 4839 (January 29, 1988): 450. http://dx.doi.org/10.1126/science.239.4839.450.b.

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BARTKY, LAN R. "Timekeeping." Science 239, no. 4839 (January 29, 1988): 450.2–450. http://dx.doi.org/10.1126/science.239.4839.450.

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Gillette, Martha U., and Sabra M. Abbott. "Biological Timekeeping." Sleep Medicine Clinics 4, no. 2 (June 2009): 99–110. http://dx.doi.org/10.1016/j.jsmc.2009.01.005.

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Gillette, Martha U., Sabra M. Abbott, and Jennifer M. Arnold. "Biological Timekeeping." Sleep Medicine Clinics 7, no. 3 (September 2012): 427–42. http://dx.doi.org/10.1016/j.jsmc.2012.06.001.

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Giebultowicz, J. "Chronobiology: Biological Timekeeping." Integrative and Comparative Biology 44, no. 3 (June 1, 2004): 266. http://dx.doi.org/10.1093/icb/44.3.266.

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Morrison, Philip. "The Timekeeping ELF." Scientific American 278, no. 4 (April 1998): 105–7. http://dx.doi.org/10.1038/scientificamerican0498-105.

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Foulkes, Nick. "Timekeeping in worms." Trends in Genetics 16, no. 4 (April 2000): 159. http://dx.doi.org/10.1016/s0168-9525(00)01975-2.

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KARATSOREOS, I., and R. SILVER. "Chronobiology: biological timekeeping." Physiology & Behavior 82, no. 5 (October 15, 2004): 927–29. http://dx.doi.org/10.1016/s0031-9384(04)00288-4.

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Bechtold, David A. "Energy-responsive timekeeping." Journal of Genetics 87, no. 5 (December 2008): 447–58. http://dx.doi.org/10.1007/s12041-008-0067-6.

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Wu, Carole-Jean, and Margaret Martonosi. "Adaptive timekeeping replacement." ACM Transactions on Architecture and Code Optimization 8, no. 1 (April 2011): 1–26. http://dx.doi.org/10.1145/1952998.1953001.

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Dissertations / Theses on the topic "Timekeeping"

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Crosby, Priya. "Metabolic regulation of circadian timekeeping." Thesis, University of Cambridge, 2017. https://www.repository.cam.ac.uk/handle/1810/269019.

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Circadian rhythms are self-sustained endogenous biological oscillations with a period of approximately 24 hours. These rhythms are observed widely across kingdoms and at all levels of biological scale. Recent work has shown there to be circadian variation in metabolism, both at the organismal and cellular level. It has also been posited that rhythmic production of metabolites might be essential for maintenance of circadian rhythmicity within cells, even in the absence of nascent transcription. The first portion of this thesis investigates the contribution of primary carbohydrate metabolism to cellular timekeeping, with particular emphasis on the pentose phosphate pathway. I also describe and validate a new 13C labelling technique for accurate determination of the relative flux through early primary metabolic pathways. This is accompanied by the development and optimisation of a microfluidic system for long-term perfused tissue culture, which allows for longitudinal study of metabolic flux within the same population of cells with simultaneous recording of clock gene activity. This perfused system provides several advantages over static tissue culture. The second portion considers the effects of the metabolic hormone insulin on circadian rhythmicity, both at the level of the cell and of the whole organism. It shows that administration of insulin is sufficient to shift the phase of circadian gene expression and elicits induction of clock protein PER2. Strikingly, manipulation of insulin signalling is sufficient to determine all the essential parameters of the cellular clock (phase, period and amplitude) in a dose-dependent but glucose independent fashion. Using pharmacological and genetic approaches, a molecular explanation for this effect is determined. This data suggests that insulin is a primary determinant of rhythms in peripheral tissues and is most likely a major signal for circadian entrainment to feeding in mammals, for which I now propose a mechanistic basis.
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Clevenson, Hannah (Hannah Anne). "Sensing and timekeeping using a light-trapping diamond waveguide." Thesis, Massachusetts Institute of Technology, 2017. http://hdl.handle.net/1721.1/111878.

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Thesis: Ph. D., Massachusetts Institute of Technology, Department of Electrical Engineering and Computer Science, 2017.
Cataloged from PDF version of thesis.
Includes bibliographical references (pages 103-112).
Solid-state quantum systems have emerged as promising sensing platforms. In particular, the spin properties of nitrogen vacancy (NV) color centers in diamond make them outstanding sensors of magnetic fields, electric fields, and temperature under ambient conditions. This thesis focuses on spin-based sensing using multimode diamond waveguide structures to efficiently use large ensembles of NV centers (> 10¹⁰). Temperature-stabilized precision magnetometry, thermometry, and electrometry are discussed. In addition, the precision characterization of the NV ground state structure under a transverse magnetic field and the use of NV-diamond for spin-based clocks are reported.
by Hannah Clevenson.
Ph. D.
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Kotru, Krish. "Timekeeping and accelerometry with robust light pulse atom interferometers." Thesis, Massachusetts Institute of Technology, 2015. http://hdl.handle.net/1721.1/98681.

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Thesis: Ph. D., Massachusetts Institute of Technology, Department of Aeronautics and Astronautics, 2015.
Cataloged from PDF version of thesis.
Includes bibliographical references (pages 165-173).
Light pulse atom interferometry (LPAI) is a powerful technique for precision measurements of inertial forces and time. Laboratory LPAI systems currently achieve state-ofthe- art acceleration sensitivity and establish the international atomic time standard. However, the realization of practical LPAI in dynamic environments (e.g., rapidly accelerating or rotating platforms) has been limited in part by atom optics-the analogues to optical beamsplitters and mirrors. Atom optics in traditional LPAIs are composed of resonant laser pulses that are susceptible to variations in optical detuning and intensity expected in sensors designed for dynamic environments. This thesis investigates atom optics that use frequency- and intensity-modulated laser pulses to suppress sensitivity to these inhomogeneities. For atomic timekeeping applications, a Ramsey LPAI sequence based on stimulated Raman transitions and frequency-swept adiabatic rapid passage (ARP) was developed. Raman ARP drives coherent transfer in an effective two-level atomic system by sweeping the Raman detuning through the two-photon resonance. In experiments with ¹³³Cs atoms, Raman ARP reduced the sensitivity of Ramsey sequences to differential AC Stark shifts by about two orders of magnitude, relative to standard Raman transitions. Raman ARP also preserved fringe contrast despite substantial intensity inhomogeneity. The fractional frequency uncertainty of the ARP Ramsey sequence was limited by second-order Zeeman shifts to ~3.5 x 10-¹² after about 2500 s of averaging. For accelerometry applications, Raman ARP provided efficient, large momentum transfer (LMT) atom optics in an acceleration-sensitive LPAI. These atom optics produced momentum splittings of up to 30 photon recoil momenta between interfering wavepackets-the largest to date for Raman atom optics. This splitting, in principle, enables up to a factor-of-15 improvement in sensitivity over the nominal interferometer. By forgoing cooling methods that reduce atom number, this LMT method reduces the measurement uncertainty due to atom shot-noise and enables large area atom interferometry at higher data-rates. These features could prove useful for fielded inertial sensors based on atom interferometry.
by Krish Kotru.
Ph. D.
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Symons, Sarah. "Ancient Egyptian astronomy : timekeeping and cosmography in the New Kingdom." Thesis, University of Leicester, 1999. http://hdl.handle.net/2381/8546.

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The first part of this study analyses and discusses astronomical timekeeping methods used in the New Kingdom. Diagonal star clocks are examined first, looking at classification of sources, decan lists, and the updating of the tables over time. The date list in the Osireion at Abydos is discussed, and issues concerning its place in the history of astronomical timekeeping are raised. The final stellar timekeeping method, the Ramesside star clock, is then examined. The conventional interpretation of the observational method behind the tables is challenged by a new theory, and a system of analysing the tables is introduced. The conclusions of the previous sections are then gathered together in a discussion of the development of stellar timekeeping methods. The small instruments known as shadow clocks, and their later relatives the sloping sundials, are also examined. The established hypothesis that the shadow clock was completed by the addition of a crossbar is challenged and refuted. The second part of this study is based on New Kingdom representations of the sky. Two major texts and several celestial diagrams are discussed in detail, beginning with the Book of Nut, which describes the motions of the sun and stars. New translations of the vignette and dramatic text are presented and discussed. Portions of the Book of the Day describing the behaviour of the sun and circumpolar group of stars are analysed. Finally, celestial diagrams dating from the New Kingdom are described. Their composition and significance is discussed and the conceptual framework behind the diagrams is recreated. By introducing new theories and analysis methods, and using a modem but sympathetic approach to the original sources, this study attempts to update and extend our knowledge of these areas of ancient astronomy.
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Wu, Nancy Y. (Nancy Yue). "Stability enhancement of atomic timekeeping using Raman adiabatic rapid passage." Thesis, Massachusetts Institute of Technology, 2017. http://hdl.handle.net/1721.1/119294.

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Thesis: S.M., Massachusetts Institute of Technology, Department of Aeronautics and Astronautics, 2017.
Cataloged from PDF version of thesis.
Includes bibliographical references (pages 83-85).
Current state-of-the-art atomic clocks span the range from large accurate fountain clocks such as the NIST-F2 to relatively small inaccurate chip scale clocks. Small clocks with higher accuracy could greatly expand the range of applications for precision timekeeping, and enable cheaper implementation of existing applications. This type of clock may be realized by use of optical Raman interferometry based on pulsed interrogation of cold atoms. However, this method suffers from serious systematic error sources, e.g., AC Stark shift and Zeeman shift, which alter the atomic resonance frequency. A new method based on adiabatic rapid passage (ARP) has been recently demonstrated at Draper which has significantly reduced phase sensitivity to differential AC Stark shift. It is found that compared to standard Raman, use of ARP enhances timekeeping stability by a factor of three with stability of 2 x 10⁻¹² at 100 seconds. Increasing data rate may also improve short term stability. With all of the above improvements, ARP enhances short term fractional stability to 7 x 10⁻¹² at one second.
by Nancy Y. Wu.
S.M.
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Strigel, Brian R. "MARKET ANALYSIS FOR THE MICOZED TIMEKEEPING AND GEOLOCATION SENSOR (TGS)." Case Western Reserve University School of Graduate Studies / OhioLINK, 2019. http://rave.ohiolink.edu/etdc/view?acc_num=case1560355697918008.

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O'Grady, Joseph Francis. "Molecular biology of timekeeping in the beach amphipod Talitrus saltator (Montagu)." Thesis, Aberystwyth University, 2013. http://hdl.handle.net/2160/6d061b84-80ac-401e-ae99-c1577cb5c006.

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Hamnett, Ryan. "Molecular and genetic analysis of neuropeptide signalling in mammalian circadian timekeeping." Thesis, University of Cambridge, 2017. https://www.repository.cam.ac.uk/handle/1810/267953.

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The suprachiasmatic nucleus (SCN) of the hypothalamus is the master mammalian pacemaker, co-ordinating the multitude of cell-autonomous circadian oscillators across the body to ensure internal synchrony, as well as maintaining an adaptive phase relationship with the light-dark cycle via projections from the retina. Intercellular communication between SCN clock neurons synchronises their oscillations, resulting in coherent output signals to the periphery. Vasoactive intestinal peptide (VIP), a neuropeptide expressed in the retinorecipient ventrolateral region of the SCN, is vital to this circuit-level co-ordination by signalling to its cognate VPAC2 receptor. In addition, VIP is important for the integration of light input into the SCN oscillation. The aims of the work presented in this thesis were to determine the roles of the VIP and VPAC2 cells in controlling circadian rhythmicity, and to elucidate the mechanisms of VIP signalling that underpin these roles. The first two experimental chapters utilise intersectional genetics and viral transduction to address separable roles for the VIP and VPAC2 cell populations. By diphtheria toxin-mediated cell ablation, or by adjusting cell-autonomous periodicity or rhythmicity specifically in these cell populations, I have identified that the VPAC2 cells are important for period setting and rhythmicity of both the SCN ex vivo and mouse behaviour in vivo, while the VIP cells play a vital role in behavioural rhythmicity and phase coherence across the SCN. The next two chapters use application of VIP to SCN slices to address mechanisms of phase-resetting through pharmacological manipulation and microarray analysis. I find that VIP has long lasting effects on all major circadian parameters of the SCN slice oscillation at both the cellular and circuit levels, and that it achieves this through a diversity of molecular pathways, in particular through cAMP/Ca2+ response elements within gene promoters. The final chapter focuses primarily on DUSP4, a negative regulator of the MAP kinase pathway that I have demonstrated to be upregulated by VIP. Here I demonstrate that DUSP4 affects the steady-state period of SCN slices, as well as influences phase shifting characteristics of both slices and mice. To conclude, the work presented here furthers our knowledge of neuropeptidergic communication in mammalian pacemaking. I have undertaken extensive characterisation of the molecular mechanisms through which the VIP neuropeptide influences SCN oscillators, and I have determined differential roles for the VIP and VPAC2 neurons in circadian timekeeping.
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Amponsah, Prince Saforo [Verfasser], and Bruce [Akademischer Betreuer] Morgan. "PEROXIREDOXINS - Novel mediators of cellular timekeeping / Prince Saforo Amponsah ; Betreuer: Bruce Morgan." Kaiserslautern : Technische Universität Kaiserslautern, 2020. http://d-nb.info/1203624875/34.

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Wang, Che-Wei S. M. Massachusetts Institute of Technology. "Tools for mindful timekeeping : 4 devices to change our relationship to time." Thesis, Massachusetts Institute of Technology, 2015. http://hdl.handle.net/1721.1/98615.

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Thesis: S.M., Massachusetts Institute of Technology, School of Architecture and Planning, Program in Media Arts and Sciences, 2015.
Cataloged from PDF version of thesis.
Includes bibliographical references (pages 49-51).
This thesis presents an investigation into the development of a series of devices that alter our relationship to time. The intention behind each of these devices is to help people become more aware of the temporality that is at the core of our being. Time pressure comes from the networks of timekeeping that surround us. It's not just our clocks and watches. Time is synchronized across devices, cities, and continents. Networked time regulates our lives today more than ever before. Modern timekeeping has shaped our culture into one that squeezes productivity out of even the most inconceivably small time increments. Time was once kept at a distance. Church towers and grandfather clocks marked time in space. As technology advanced, timekeeping has shifted inwards and closer to our bodies. Time is embedded in watches, phones, and every digital electronic device that surrounds us. Today, fewer people wear watches and keep time for themselves. We've outsourced our sense of time to systems that we don't understand. Our phones and computers display time accurately without intervention or maintenance, making watches seem redundant. Those who are less aware of time are surrendering to an unfamiliar force. They invite environmental pressures to pull their sense of time away from an innate internal awareness towards a grossly distorted sense that views time as a commodity. Modern timekeeping might help with efficiency, but we are busier today than ever before. While we've shaped our temporal perception through the increasing precision of standardized time, human psychology remains connected to time, but not congruent to the physics of it. If we can become more aware of our relationships to time, we can manage our expectations and counteract temporal illusions, misperceptions, and distortions. The devices presented here call for a more mindful approach to timekeeping. Rather than pushing time into the periphery, I hope to empower people to make time their own. We can challenge the temporal pressures of our environment, culture, technology, and state of mind through an alternative relationship to time.
by Che-Wei Wang.
S.M.
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Books on the topic "Timekeeping"

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Timekeeping. London: British Library, 1992.

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Dale, Rodney. Timekeeping. New York: Oxford University Press, 1992.

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C, Dunlap Jay, Loros Jennifer J, and DeCoursey Patricia J, eds. Chronobiology: Biological timekeeping. Sunderland, Mass: Sinauer Associates, 2004.

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S, Orlove Benjamin, and Wenner-Gren Foundation for Anthropological Research., eds. Repertoires of timekeeping in anthropology. Chicago, Ill: University of Chicago Press, 2002.

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S, Orlove Benjamin, and Wenner-Gren Foundation for Anthropological Research., eds. Repertoires of timekeeping in anthropology. Chicago, Ill: University of Chicago Press, 2002.

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(Firm), Made E.-Z. Products. Attendance monitor made E-Z. 7th ed. Deerfield Beach, FL: Made EZ Products, 2003.

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Kumar, Vinod, ed. Biological Timekeeping: Clocks, Rhythms and Behaviour. New Delhi: Springer India, 2017. http://dx.doi.org/10.1007/978-81-322-3688-7.

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American Bar Association. Section of Law Practice Management., ed. The lawyer's quick guide to timeslips. Chicago, Ill: American Bar Association, Law Practice Management Section, 1998.

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Gloyn, J. C. Early methods of timekeeping, with accompanying science experiments. Newport, I.O.W: Isle of Wight Teachers' Centre, 1987.

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Graf, Johannes. Modern times: Timekeeping on its way to the present. Furtwangen: Deutsches Uhrenmuseum, 2006.

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Book chapters on the topic "Timekeeping"

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Baker, Jill L. "Timekeeping." In Technology of the Ancient Near East, 238–50. Milton Park, Abingdon, Oxon: Routledge, 2018.: Routledge, 2018. http://dx.doi.org/10.4324/9781351188111-16.

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Maliangkay, Roald. "Colonial timekeeping." In Popular Culture and the Transformation of Japan–Korea Relations, 19–33. London ; New York, NY : Routledge/Taylor & Francis Group, 2020. | Series: Asia’s transformations: Routledge, 2020. http://dx.doi.org/10.4324/9780429399558-3.

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Bhangal, Sham, John Davey, Jen deHaan, Scott Mebberson, Tim Parker, and Glen Rhodes. "Time and Timekeeping." In Flash MX ActionScript Designer’s Reference, 292–312. Berkeley, CA: Apress, 2002. http://dx.doi.org/10.1007/978-1-4302-5147-7_14.

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Matthews, Michael R. "Ancient and Medieval Timekeeping." In Time for Science Education, 47–76. Dordrecht: Springer Netherlands, 2000. http://dx.doi.org/10.1007/978-94-011-3994-6_3.

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Brown, Matthew R., and Aleksey V. Matveyenko. "Biological Timekeeping: Scientific Background." In Circadian Rhythm Sleep-Wake Disorders, 1–20. Cham: Springer International Publishing, 2020. http://dx.doi.org/10.1007/978-3-030-43803-6_1.

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Young, Michael W. "Circadian Timekeeping in Drosophila." In Handbook of Behavioral Neurobiology, 351–69. Boston, MA: Springer US, 2001. http://dx.doi.org/10.1007/978-1-4615-1201-1_14.

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Anderson, James L. "Timekeeping in an Expanding Universe." In Revisiting the Foundations of Relativistic Physics, 275–80. Dordrecht: Springer Netherlands, 2003. http://dx.doi.org/10.1007/978-94-010-0111-3_11.

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Schibler, U. "The Mammalian Circadian Timekeeping System." In Ultradian Rhythms from Molecules to Mind, 261–79. Dordrecht: Springer Netherlands, 2008. http://dx.doi.org/10.1007/978-1-4020-8352-5_12.

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Kolkowitz, Shimon, and Jun Ye. "Precision Timekeeping: Optical Atomic Clocks." In Handbook of Laser Technology and Applications, 139–56. 2nd ed. 2nd edition. | Boca Raton : CRC Press, 2021– |: CRC Press, 2021. http://dx.doi.org/10.1201/9781003130123-9.

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Deng, Kehui. "The Ancient Chinese Timekeeping Instruments." In The Studies of Heaven and Earth in Ancient China, 95–151. Singapore: Springer Singapore, 2021. http://dx.doi.org/10.1007/978-981-15-7841-0_4.

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Conference papers on the topic "Timekeeping"

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Van Baak, Tom. "Atomic Timekeeping as a Hobby." In 2020 International Technical Meeting of The Institute of Navigation. Institute of Navigation, 2020. http://dx.doi.org/10.33012/2020.17204.

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Fischer, John. "Resilient Timekeeping for Critical Infrastructure." In 51st Annual Precise Time and Time Interval Systems and Applications Meeting. Institute of Navigation, 2020. http://dx.doi.org/10.33012/2020.17303.

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Van Baak, Tom. "Atomic Timekeeping as a Hobby." In 51st Annual Precise Time and Time Interval Systems and Applications Meeting. Institute of Navigation, 2020. http://dx.doi.org/10.33012/2020.17319.

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Weaver, G. L., M. Miranian, and J. F. Garstecki. "Composite USO/CSAC timekeeping system." In 2012 IEEE Aerospace Conference. IEEE, 2012. http://dx.doi.org/10.1109/aero.2012.6187111.

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de Winkel, Jasper, Carlo Delle Donne, Kasim Sinan Yildirim, Przemysław Pawełczak, and Josiah Hester. "Reliable Timekeeping for Intermittent Computing." In ASPLOS '20: Architectural Support for Programming Languages and Operating Systems. New York, NY, USA: ACM, 2020. http://dx.doi.org/10.1145/3373376.3378464.

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Soares, Eduardo, Pedro Brandao, and Rui Prior. "Analysis of Timekeeping in Experimentation." In 2020 12th International Symposium on Communication Systems, Networks and Digital Signal Processing (CSNDSP). IEEE, 2020. http://dx.doi.org/10.1109/csndsp49049.2020.9249632.

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Gifford, A., S. R. Stein, and R. A. Nelson. "Timekeeping in future NASA missions." In 18th European Frequency and Time Forum (EFTF 2004). IEE, 2004. http://dx.doi.org/10.1049/cp:20040924.

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VoBa, Son, Charles L. Ulland, Michael A. Lombardi, and Arno Lentfer. "Rethinking Timekeeping for Modern IT Solutions." In 50th Annual Precise Time and Time Interval Systems and Applications Meeting. Institute of Navigation, 2019. http://dx.doi.org/10.33012/2019.16764.

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Wilson, R. E. "International timekeeping for power system users." In 6th International Conference on Developments in Power Systems Protection. IEE, 1997. http://dx.doi.org/10.1049/cp:19970097.

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Coddington, Ian, Stefan Droste, Jean-Daniel Deschenes, Laura C. Sinclair, Daniel I. Herman, William C. Swann, and Nathan R. Newbury. "Frequency combs for robust optical timekeeping." In 2016 IEEE Photonics Conference (IPC). IEEE, 2016. http://dx.doi.org/10.1109/ipcon.2016.7830961.

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Reports on the topic "Timekeeping"

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Vessot, R. F. C., D. W. Allan, S. J. B. Crampton, L. S. Cutler, R. H. Kern, A. O. McCoubrey, and J. D. White. Soviet precision timekeeping research and technology. Office of Scientific and Technical Information (OSTI), August 1991. http://dx.doi.org/10.2172/5043248.

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Mills, D. A Kernel Model for Precision Timekeeping. RFC Editor, March 1994. http://dx.doi.org/10.17487/rfc1589.

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Forger, Daniel. Modeling the Physiology of Circadian Timekeeping. Fort Belvoir, VA: Defense Technical Information Center, August 2011. http://dx.doi.org/10.21236/ada564079.

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