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Letteratura scientifica selezionata sul tema "Fundamental constants"

Autore: Grafiati

Pubblicato: 4 giugno 2021

Ultima modifica: 2 febbraio 2022

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Articoli di riviste sul tema "Fundamental constants"

1

McNaught, Ian J., e Gavin D. Peckham. "Two fundamental constants". Journal of Chemical Education 64, n. 12 (dicembre 1987): 999. http://dx.doi.org/10.1021/ed064p999.

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2

Fritzsch, Harald. "Fundamental physical constants". Uspekhi Fizicheskih Nauk 179, n. 4 (2009): 383. http://dx.doi.org/10.3367/ufnr.0179.200904d.0383.

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3

Jacobsen, T. "On fundamental constants". European Journal of Physics 17, n. 2 (1 marzo 1996): 92. http://dx.doi.org/10.1088/0143-0807/17/2/011.

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4

PERES, ASHER. "VARIABILITY OF FUNDAMENTAL CONSTANTS". International Journal of Modern Physics D 12, n. 09 (ottobre 2003): 1751–54. http://dx.doi.org/10.1142/s0218271803004043.

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Are universal fundamental constants really constant over cosmological times? Recent observations of the fine structure of spectral lines in the early universe have been interpreted as due to a variation of the fine structure constant e2/4πε0ℏc. From the assumed validity of Maxwell equations in general relativity and well known experimental facts, it is proved that e and ℏ are absolute constants. On the other hand, the speed of light need not be constant.

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5

Mohr, Peter J., Barry N. Taylor e David B. Newell. "The fundamental physical constants". Physics Today 60, n. 7 (luglio 2007): 52–55. http://dx.doi.org/10.1063/1.2761803.

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6

Troitskiĭ, V. S. "Evolution of fundamental constants". Soviet Journal of Quantum Electronics 17, n. 9 (30 settembre 1987): 1212–13. http://dx.doi.org/10.1070/qe1987v017n09abeh009915.

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7

Jacobsen, T. "Bremsstrahlung and fundamental constants". European Journal of Physics 17, n. 6 (1 novembre 1996): 365. http://dx.doi.org/10.1088/0143-0807/17/6/012.

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8

Casey, Terence W. "Cosmology and the Fundamental Constants." Physics Essays 2, n. 1 (1 marzo 1989): 44–46. http://dx.doi.org/10.4006/1.3036470.

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9

Okun, Lev B. "The fundamental constants of physics". Uspekhi Fizicheskih Nauk 161, n. 9 (1991): 177–94. http://dx.doi.org/10.3367/ufnr.0161.199109e.0177.

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Fritzsch, Harald. "The fundamental constants in physics". Physics-Uspekhi 52, n. 4 (30 aprile 2009): 359–67. http://dx.doi.org/10.3367/ufne.0179.200904d.0383.

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Tesi sul tema "Fundamental constants"

1

Sandvik, Havard Bunes. "Varying fundamental constants in cosmology". Thesis, Imperial College London, 2002. http://hdl.handle.net/10044/1/11460.

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DiFilippo, Frank. "Precise atomic masses for determining fundamental constants". Thesis, Massachusetts Institute of Technology, 1994. http://hdl.handle.net/1721.1/26860.

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Thompson, Rodger. "The Relation between Fundamental Constants and Particle Physics Parameters". MDPI AG, 2017. http://hdl.handle.net/10150/624359.

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The observed constraints on the variability of the proton to electron mass ratio and the fine structure constant are used to establish constraints on the variability of the Quantum Chromodynamic Scale and a combination of the Higgs Vacuum Expectation Value and the Yukawa couplings. Further model dependent assumptions provide constraints on the Higgs VEV and the Yukawa couplings separately. A primary conclusion is that limits on the variability of dimensionless fundamental constants such as and provide important constraints on the parameter space of new physics and cosmologies.

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Murphy, Michael T. Physics Faculty of Science UNSW. "Probing variations in the fundamental constants with quasar absorption lines". Awarded by:University of New South Wales. School of Physics, 2002. http://handle.unsw.edu.au/1959.4/19062.

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Precision cosmology challenges many aspects of fundamental physics. In particular, quasar absorption lines test the assumed constancy of fundamental constants over cosmological time-scales and distances. Until recently, the most reliable technique was the alkali doublet (AD) method where the measured doublet separation probes variations in the fine-structure constant, ???? e2/??c. However, the recently introduced many-multiplet (MM) method provides several advantages, including a demonstrated ???10-fold precision gain. This thesis presents detailed MM analyses of 3 independent Keck/HIRES samples containing 128 absorption systems with 0.2 > zabs > 3.7. We find 5.6 ?? statistical evidence for a smaller ?? in the absorption clouds: ????/?? = (-0.574 ?? 0.102) x 10-5. All three samples separately yield consistent, significant ????/??. The data marginally prefer constant d??/dt rather than constant ????/??. The two-point correlation function for ?? and the angular distribution of ????/?? give no evidence for spatial variations. We also analyse 21 Keck/HIRES Si iv doublets, obtaining a 3-fold relative precision gain over previous AD studies: ????/?? = (-0.5 ?? 1.3) x 10-5 for 2.0 > zabs > 3.1. Our statistical evidence for varying ?? requires careful consideration of systematic errors. Modelling demonstrates that atmospheric dispersion is potentially important. However, the quasar spectra suggest a negligible effect on ????/??. Cosmological variation in Mg isotopic abundances may affect ????/?? at zabs > 1.8. Galactic observations and theory suggest diminished 25;26Mg abundances in the low metallicity quasar absorbers. Removing 25;26Mg isotopes yields more negative ????/?? values. Overall, known systematic errors can not explain our results. We also constrain variations in y ?? ?? 2gp, comparing H i 21-cm and millimetrewave molecular absorption in 2 systems. Fitting both the H i and molecular lines yields the tightest, most reliable current constraints: ??y/y = (-0.20??0.44)x10-5 and (-0.16??0.54)x10-5 at zabs = 0.2467 and 0.6847 respectively. Possible line-ofsight velocity differences between the H i and molecular absorbing regions dominate these 1 ?? errors. A larger sample of mm/H i comparisons is required to reliably quantify this uncertainty and provide a potentially crucial check on the MM result.

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Alanko, S. (Seppo). "High resolution infrared spectroscopy on the fundamental bands of ¹³CH₃I". Doctoral thesis, University of Oulu, 1999. http://urn.fi/urn:isbn:9514251857.

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Abstract This thesis deals with the rotation-vibration theory and high resolution infrared spectroscopy of semirigid C3 molecules. Semirigid molecules form a class of molecules which are strongly bound with one well defined structure, and without low frequency internal motions. The theory, as well as the experimental studies of semirigid molecules are of special importance in the field of rotation-vibration spectroscopy. They provide a good starting point for interpreting and analyzing the spectra of practically all types of molecules. In this work, the theory is reviewed fromthe standpoint of one particular molecule, 13CH3I, which is a prolate symmetric top with C3 symmetry. The origin and the properties of the rotation-vibration Hamiltonian are discussed in detail. Molecular symmetry plays an important role in these studies. The expansion of the Hamiltonian for nuclear motion in powers of the vibrational operators converges rapidly as numerical examples thoughout the treatment indicate. The molecule is thus a good subject for the perturbation calculations, also reviewed here in detail. 13CH3I can be considered as a model example of semirigid molecules. From the spectroscopic point of view, this thesis is a study of the six fundamental bands of 13CH3I. The rotational analysis of the vibrational ground state is first given. Special attention is paid to obtaining the axial rotational constants which are problematic for symmetric top molecules. The relatively high energy level density of 13CH3I leads to several resonances. The fundamental bands, especially the higher ones, must therefore be treated as parts of band systems. Care is paid to properly take into account the effects of the near-lying vibrational levels on the constants of the fundamentals. Certain ambiguities in the rotation-vibration Hamiltonian of 13CH3I are also discussed.

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Davis, Tamara Maree Physics Faculty of Science UNSW. "Fundamental aspects of the expansion of the universe and cosmic horizons". Awarded by:University of New South Wales. Physics, 2004. http://handle.unsw.edu.au/1959.4/20640.

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We use standard general relativity to clarify common misconceptions about fundamental aspects of the expansion of the Universe. In the context of the new standard Lambda-CDM cosmology we resolve conflicts in the literature regarding cosmic horizons and the Hubble sphere (distance at which recession velocity equals c) and we link these concepts to observational tests. We derive the dynamics of a non-comoving galaxy and generalize previous analyses to arbitrary FRW universes. We also derive the counter-intuitive result that objects at constant proper distance have a non-zero redshift. Receding galaxies can be blueshifted and approaching galaxies can be redshifted, even in an empty universe for which one might expect special relativity to apply. Using the empty universe model we demonstrate the relationship between special relativity and Friedmann-Robertson-Walker cosmology. We test the generalized second law of thermodynamics (GSL) and its extension to incorporate cosmological event horizons. In spite of the fact that cosmological horizons do not generally have well-defined thermal properties, we find that the GSL is satisfied for a wide range of models. We explore in particular the relative entropic "eworth"e of black hole versus cosmological horizon area. An intriguing set of models show an apparent entropy decrease but we anticipate this apparent violation of the GSL will disappear when solutions are available for black holes embedded in arbitrary backgrounds. Recent evidence suggests a slow increase in the fine structure constant over cosmological time scales. This raises the question of which fundamental quantities are truly constant and which might vary. We show that black hole thermodynamics may provide a means to discriminate between alternative theories invoking varying constants, because some variations in the fundamental "econstants"e could lead to a violation of the generalized second law of thermodynamics.

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Svanedal, Ida. "Fundamental Characterization and Technical Aspects of a Chelating Surfactant". Doctoral thesis, Mittuniversitetet, Avdelningen för kemiteknik, 2014. http://urn.kb.se/resolve?urn=urn:nbn:se:miun:diva-21405.

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The purpose of this study was to investigate the fundamental characteristics of a chelating surfactant in terms of solution behaviour, chelation of divalent metal ions, and interaction in mixtures with different foaming agents and divalent metal ion, as well as examining its prospects in some practical applications. Chelating surfactants are functional molecules, with both surface active and chelating properties, which are water soluble and therefore suitable for chelation in many aqueous environments. The dual functionality offers the possibility to recover the chelating surfactant as well as the metals. The DTPA (diethylenetriaminepentaacetic acid)-based chelating surfactant 4-C12-DTPA (2-dodecyldiethylenetriaminepentaacetic acid) was synthesized at Mid Sweden University. In the absence of metal ions, all eight donor atoms in the headgroup of 4-C12-DTPA are titrating and the headgroup charge can be tuned from +3 to -5 by altering the pH. The solution properties, studied by surface tension measurements and NMR diffusometry, were consequently found strongly pH dependent. pH measurements of chelating surfactant solutions as a function of concentration was used to extract information regarding the interaction between surfactants in the aggregation process. Small differences in the conditional stability constants (log K) between coordination complexes of DTPA and 4-C12-DTPA, determined by competition measurements utilizing electrospray ionization mass spectrometry (ESI-MS), indicated that the hydrocarbon tail only affected the chelating ability of the headgroup to a limited extent. This was further confirmed in hydrogen peroxide bleaching of thermomechanical pulp (TMP) treated with 4-C12-DTPA. Interaction parameters for mixed systems of 4-C12-DTPA and different foaming agents were calculated following the approach of Rubingh’s regular solution theory. The mixtures were also examined with addition of divalent metal ions in equimolar ratio to the chelating surfactant. Strong correlation was found between the interaction parameter and the phase transfer efficiency of Ni2+ ions during flotations. Furthermore, a significant difference in log K between different metal complexes with 4-C12-DTPA enabled selective recovery of the metal ion with the highest log K. The findings in this study contribute to the understanding of the fundamental characteristics of chelating surfactants, which can be further utilized in practical applications.

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Prause, Nils [Verfasser], e Dieter [Akademischer Betreuer] Reimers. "The influence of asymmetric line profiles on the reliability of the search for varying fundamental constants / Nils Prause. Betreuer: Dieter Reimers". Hamburg : Staats- und Universitätsbibliothek Hamburg, 2014. http://d-nb.info/1059237946/34.

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Windberger, Robert-Alexander [Verfasser], e López-Urrutia José Ramón [Akademischer Betreuer] Crespo. "Identification of optical transitions in complex highly charged ions for applications in metrology and tests of fundamental constants / Robert-Alexander Windberger ; Betreuer: José Ramón Crespo López-Urrutia". Heidelberg : Universitätsbibliothek Heidelberg, 2015. http://d-nb.info/1180396839/34.

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Windberger, Alexander [Verfasser], e López-Urrutia José Ramón [Akademischer Betreuer] Crespo. "Identification of optical transitions in complex highly charged ions for applications in metrology and tests of fundamental constants / Robert-Alexander Windberger ; Betreuer: José Ramón Crespo López-Urrutia". Heidelberg : Universitätsbibliothek Heidelberg, 2015. http://nbn-resolving.de/urn:nbn:de:bsz:16-heidok-188685.

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Più fonti

Libri sul tema "Fundamental constants"

1

1960-, Karshenboim S. G., e Peik E, a cura di. Astrophysics, clocks and fundamental constants. Berlin: Springer, 2004.

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2

Karshenboim, Savely G., e Ekkehard Peik, a cura di. Astrophysics, Clocks and Fundamental Constants. Berlin, Heidelberg: Springer Berlin Heidelberg, 2004. http://dx.doi.org/10.1007/b13178.

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3

The fundamental constants: A mystery of physics. New Jewrsey: World Scientific, 2009.

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4

NATO Advanced Study Institute on Gravitational Measurements, Fundamental Metrology, and Constants (1987 Erice, Italy). Gravitational measurements, fundamental metrology, and constants. Dordrecht: Kluwer Academic Publishers, 1988.

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5

Sabbata, Venzo, e V. N. Melnikov, a cura di. Gravitational Measurements, Fundamental Metrology and Constants. Dordrecht: Springer Netherlands, 1988. http://dx.doi.org/10.1007/978-94-009-2955-5.

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Sabbata, Venzo. Gravitational Measurements, Fundamental Metrology and Constants. Dordrecht: Springer Netherlands, 1988.

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7

Paolo, Molaro, e SpringerLink (Online service), a cura di. From Varying Couplings to Fundamental Physics: Proceedings of Symposium 1 of JENAM 2010. Berlin, Heidelberg: Springer-Verlag Berlin Heidelberg, 2011.

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8

The fundamental physical constants and the frontier of measurement. Bristol: A. Hilger, 1985.

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9

Cohen, E. Richard. The 1986 adjustment of the fundamental physical constants. Oxford: Pergamon Press, 1986.

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10

Cohen, E. Richard. Symbols, units, nomenclature and fundamental constants in physics. [Go teborg]: International Union of Pure and Applied Physics, 1987.

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Capitoli di libri sul tema "Fundamental constants"

1

Cardarelli, François. "Fundamental Constants". In Encyclopaedia of Scientific Units, Weights and Measures, 771–79. London: Springer London, 2003. http://dx.doi.org/10.1007/978-1-4471-0003-4_5.

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Cardarelli, François. "Fundamental Constants". In Scientific Unit Conversion, 443–48. London: Springer London, 1999. http://dx.doi.org/10.1007/978-1-4471-0805-4_5.

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3

Cardarelli, François. "Fundamental Constants". In Scientific Unit Conversion, 419–24. London: Springer London, 1997. http://dx.doi.org/10.1007/978-1-4471-3394-0_5.

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4

Martienssen, Werner. "The Fundamental Constants". In Springer Handbook of Materials Data, 3–9. Cham: Springer International Publishing, 2018. http://dx.doi.org/10.1007/978-3-319-69743-7_1.

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5

Cohen, E. Richard. "Fundamental Physical Constants". In Gravitational Measurements, Fundamental Metrology and Constants, 59–89. Dordrecht: Springer Netherlands, 1988. http://dx.doi.org/10.1007/978-94-009-2955-5_5.

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6

Grabe, Michael. "Fundamental Constants of Physics". In Measurement Uncertainties in Science and Technology, 337–47. Cham: Springer International Publishing, 2014. http://dx.doi.org/10.1007/978-3-319-04888-8_22.

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7

Kapuścik, Edward. "Physics Without Physical Constants". In Frontiers of Fundamental Physics, 387–91. Boston, MA: Springer US, 1994. http://dx.doi.org/10.1007/978-1-4615-2560-8_46.

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8

Kiefer, Claus. "Quantum Gravity and Fundamental Constants". In Astrophysics, Clocks and Fundamental Constants, 115–27. Berlin, Heidelberg: Springer Berlin Heidelberg, 2004. http://dx.doi.org/10.1007/978-3-540-40991-5_8.

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9

Faustov, R. N. "Quantum Electrodynamics and Fundamental Constants". In Gravitational Measurements, Fundamental Metrology and Constants, 131–42. Dordrecht: Springer Netherlands, 1988. http://dx.doi.org/10.1007/978-94-009-2955-5_9.

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Flowers, Jeff, e Brian Petley. "Constants, Units and Standards". In Astrophysics, Clocks and Fundamental Constants, 75–93. Berlin, Heidelberg: Springer Berlin Heidelberg, 2004. http://dx.doi.org/10.1007/978-3-540-40991-5_5.

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Atti di convegni sul tema "Fundamental constants"

1

Di Mario, D., B. G. Sidharth, F. Honsell, O. Mansutti, K. Sreenivasan e A. De Angelis. "Connecting Fundamental Constants". In FRONTIERS OF FUNDAMENTAL AND COMPUTATIONAL PHYSICS: 9th International Symposium. AIP, 2008. http://dx.doi.org/10.1063/1.2947669.

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2

Flambaum, V. V. "Variation of Fundamental Constants". In ATOMIC PHYSICS 20: XX International Conference on Atomic Physics - ICAP 2006. AIP, 2006. http://dx.doi.org/10.1063/1.2400630.

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Wood, B. M. "Fundamental constants - the ultimate metric". In 2012 Conference on Precision Electromagnetic Measurements (CPEM 2012). IEEE, 2012. http://dx.doi.org/10.1109/cpem.2012.6250629.

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Grabe, Michael. "Fundamental Constants - True Values and Expectations". In 2004 Conference on Precision Electromagnetic Measurements. IEEE, 2004. http://dx.doi.org/10.1109/cpem.2004.305465.

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5

Feldmeier, Hans, Elena Litvinova, Victor Flambaum e Jacek Dobaczewski. "Variation of fundamental constants and 229Th". In Proceedings of the MG14 Meeting on General Relativity. WORLD SCIENTIFIC, 2017. http://dx.doi.org/10.1142/9789813226609_0478.

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Varshalovich, D. A., A. Y. Potekhin e A. V. Ivanchik. "Testing cosmological variability of fundamental constants". In X-RAY AND INNER-SHELL PROCESSES: 18th International Conference. AIP, 2000. http://dx.doi.org/10.1063/1.1302777.

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Krauth, Julian J., Laura S. Dreissen, Charlaine Roth, Elmer L. Gründeman, Mathieu Collombon, Maxime Favier e Kjeld S. E. Eikema. "Paving the way for fundamental physics tests with singly-ionized helium". In International Conference on Precision Physics and Fundamental Physical Constants. Trieste, Italy: Sissa Medialab, 2019. http://dx.doi.org/10.22323/1.353.0049.

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Adkins, Gregory, Benjamin Akers, Md Faisal Alam, Lam M. Tran e Xuan Zhang. "Calculation of higher order corrections to positronium energy levels". In International Conference on Precision Physics and Fundamental Physical Constants. Trieste, Italy: Sissa Medialab, 2019. http://dx.doi.org/10.22323/1.353.0004.

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Pásztor, Gabriella. "Precision tests of the Standard Model at the LHC with the ATLAS and CMS detectors". In International Conference on Precision Physics and Fundamental Physical Constants. Trieste, Italy: Sissa Medialab, 2019. http://dx.doi.org/10.22323/1.353.0005.

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Sopczak, Andre. "Precision measurements in Higgs sector at ATLAS and CMS". In International Conference on Precision Physics and Fundamental Physical Constants. Trieste, Italy: Sissa Medialab, 2020. http://dx.doi.org/10.22323/1.353.0006.

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Rapporti di organizzazioni sul tema "Fundamental constants"

1

Cohen, E. Richard, e Barry N. Taylor. Fundamental physical constants. Gaithersburg, MD: National Bureau of Standards, 1987. http://dx.doi.org/10.6028/nbs.sp.731.

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Mohr, P. J., P. J. Mohr e B. N. Taylor. CODATA recommended values of the fundamental physical constants :. Gaithersburg, MD: National Institute of Standards and Technology, 2005. http://dx.doi.org/10.6028/nist.sp.961e2005.

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Mohr, P. J., D. B. Newell e B. N. Taylor. CODATA recommended values of the fundamental physical constants: 2014. Gaithersburg, MD: National Institute of Standards and Technology, 2015. http://dx.doi.org/10.6028/nist.sp.961r2015.

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4

Mohr, P. J., P. J. Mohr e B. N. Taylor. CODATA recommended values of the fundamental constants of physics and chemistry. Gaithersburg, MD: National Institute of Standards and Technology, 2005. http://dx.doi.org/10.6028/nist.sp.959e2005.

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Mohr, P. J., P. J. Mohr, B. N. Taylor e D. B. Newell. CODATA recommended values of the fundamental constants of physics and chemistry. Gaithersburg, MD: National Institute of Standards and Technology, 2008. http://dx.doi.org/10.6028/nist.sp.959e2008.

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6

Mohr, Peter J. 2014 CODATA RECOMMENDED VALUES OF THE FUNDAMENTAL CONSTANTS OF PHYSICS AND CHEMISTRY. Gaithersburg, MD: National Institute of Standards and Technology, aprile 2017. http://dx.doi.org/10.6028/nist.sp.959e2017.

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7

Mohr, P. J., P. J. Mohr e B. N. Taylor. 1998 CODATA recommended values of the fundamental constants of physics and chemistry. Gaithersburg, MD: National Institute of Standards and Technology, 2001. http://dx.doi.org/10.6028/nist.sp.961e2001.

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8

Biedenharn, L. C., e J. C. Solem. The fundamental and universal nature of Boltzmann`s constant. Office of Scientific and Technical Information (OSTI), luglio 1996. http://dx.doi.org/10.2172/266721.

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Maydykovskiy, Igor, e Petras Užpelkis. The Physical Essence of Time. Intellectual Archive, dicembre 2020. http://dx.doi.org/10.32370/iaj.2450.

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The article considers the model of the space-frequency-time continuum, according to which the physical essence of Time is manifested as a fraction of electromagnetic energy spent on updating a material object in a cyclic process of copying-incarnation. For all structural levels of physical reality, the value of this fraction is a fundamental constant, which can be represented as the tangent of the loss angle, or expressed in radians, as the angle of inclination of the evolutionary spiral, which characterizes the rate of change of states or the duration of events and processes. The value of this constant can be calculated, and its value turns out to be identically equals to the square of the fine structure Constant (α2). The description of the method for identifying a new constant allows us to present the formula of Scientific Discovery as the Physical Essence of Time.

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