Nicola Scafetta, PhD
Research Scientist, Duke University
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Address: Department of Physics, Free Electron Laser Laboratory (FELL) |
Office: # 219 Phone: (919) 660-2643 Fax: (919) 660-2671 Web: http://www.fel.duke.edu/~scafetta/ E-mail: ns2002@duke.edu |
PDF version of my CV: PDF
Last update May/2008
Education – Research Interests – News – Scientific Publications – Conferences & Presentations
Education:
University of North Texas (USA), Ph.D. in Physics, . . . . . . . . 2001.
Dissertation: “An entropic approach to the analysis of time series.”
(Advisor: Dr.
Paolo Grigolini.)
Universita’ di Pisa (Italy), M.S. and B.A. in Physics, . . . . . . . 1997.
Thesis: “Breakdown of the Renormalization group approach to slow relaxation processes.”
(Advisor: Dr. Paolo Grigolini.)
Professional Experience:
Actual research: Research work on nonlinear and stochastic mathematical models of complex physical and biomedical phenomena at the Physics and Medicine departments at Duke University, Durham (NC).
Previous advisor: Dr. Richard Moon. E-mail: moon0002@mc.duke.edu Phone: (919) 681-5805.
Previous advisor: Dr. Bruce J. West. E-mail: Bruce.J.West@us.army.mil Phone: (919) 549-4257.
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Department of Physics, Free Electron Laser Laboratory |
Research Scientist |
2007-actual |
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Department of Anesthesiology |
Research Associate |
2003-actual |
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Department of Physics, Free Electron Laser Laboratory |
Research Associate |
2003-2006 |
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Pratt School of Electrical and Computer Engineering |
Research Associate |
2002-2003 |
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Texas Woman’s University |
College of Nursing, Center for Nonlinear Science |
Research collaboration |
2000-2001 |
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University of North Texas |
Department of Physics, Center for Nonlinear Science |
Research collaboration |
1999-2001 |
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Department of Physics and Astronomy Computer lab |
Teaching Assistant |
1999-2001 |
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Department of Physics |
Tutor in physics for Physics freshmen |
1999-2001 |
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Universita di Pisa |
Dipartimento di fisica |
Tutor in statistics for Biology freshmen |
1994-1997 |
Physical
Review E; Physical Review Letters; Physica A,
Statistical Mechanics and its Applications; Journal of Physics D, Applied
Physics; Journal of Applied Mathematics and Computing; Journal of Vibration and
Control; European Physical Letters; Physical Letter A; IOP, New Journal of
Physics; Bioinformatics; Quantitative
Finance; Communications in Nonlinear Science and Numerical Simulations;
Computers and Mathematics with Applications; IEEE
Transactions on Biomedical Engineering; Geophys. Res. Lett.
Professional society memberships:
(1) American Physical Society
(APS)
(2) American Geophysical Union (
Computer Knowledge:
OS: General knowledge of Linux and of all Microsoft Operative Systems.
Languages: C, C++, Matlab, Mathematica, Maple, Basic.
Networking: General knowledge of Internet.
Languages:
Italian mother tongue.
Fluent English (Toefl 1998).
Elementary French and Spanish.
My research interest is in theoretical and applied statistics and nonlinear models of complex processes with applications in astronomy, biology, climatology, economy, geology, medicine and social biology. My research background is on:
[a] Nonlinear dynamics, maps and chaotic systems;
[b] Fractal and multifractal phenomena;
[c] Statistical, probabilistic, combinatorial, and (continuous and discrete) wavelet analysis of time series and complex phenomena.
[d] Extensive and non-extensive (or Tsallis) statistical mechanics;
The models are studied with computer simulations and/or analytic approaches where possible.
The basic philosophy is that complex phenomena are characterized by both nonlinear chaotic dynamics and complex stochastic properties. Therefore, there is the need to study complex phenomena by adopting both approaches. A detailed analysis of experimental data is required to efficiently identify the special patterns that characterize a complex phenomenon and to evaluate the sensitivity of a system to the variation of physical parameters. The identification of the macroscopic complex patterns and their evolution may in turn suggest an interpretation of the data according to microscopic mechanisms and eventually how to improve and/or implement a nonlinear dynamical model with a stochastic component.
My main research activity regards:
Nonlinear Dynamics, Maps, Fractal, Multifractal and Nonstationary Time Series:
Time series of data are a usual representation of physical phenomena. Therefore, mathematical tools finalized to study the complex patterns that characterize a time series are of fundamental importance in any fields of modern science. In particular, because typical complex time series are those produced by Poincare recurrence times of a nonlinear dynamical system in a phase space, the identification of the complex patterns characterizing a time series can in turn suggest a nonlinear dynamical model of the phenomenon under study. Once a nonlinear dynamical model is found, it can be possible to control its chaotic behavior with opportune controlling chaos techniques. Together with my collaborators I have studied the Manneville map as a prototype of a class of complex nonlinear processes to study the connection between dynamics and thermodynamics when a deviation from ordinary statistical mechanics occurs. Anomalous statistical mechanics is characterized by an inverse-power-law or Levy probability distributions, such as the non-extensive Tsallis statistical mechanics, while the ordinary statistical mechanics is characterized by Poisson or Gaussian probability distributions. Moreover, we have developed one of the scaling analysis methods for time series, the “Diffusion Entropy Analysis (DEA)” and studied its properties. Particular emphasis has been done on intermittent processes, and on diffusion processes and on the differences between fractal Gaussian and Levy noises, the latter in both forms of Levy-flight and Levy-walk (that are different processes). In general, the presence of a Levy-walk statistics in a given time series process may indicate a link between the phenomenon under study and an intermittent process characterized by an inverse power law waiting time distribution. Such a difference between fractal Gaussian noise and Levy-walk noises can be detected by mean of the jointed use of two scaling analysis techniques, the Diffusion Entropy Analysis (DEA) and Standard Deviation Analysis (SDA). Particular interesting noises are those where the fractal Gaussian properties and the Levy properties are mixed. In addition to the above fractal and bi-fractal time series, natural phenomena present also multifractal properties. We have used wavelet multifractal formalisms to study the evolution of the local Holder exponent of a time series and write nonlinear stochastic models to describe, reproduce and control such a behavior. We have also developed methods to separate non-stationary components, such as seasonalities, from fractal components of a time series. All above methods have allowed to identify and/or model complex patterns in complex, chaotic and turbulent phenomena such as solar flare waiting time series, total solar irradiance, global temperature and climate, earthquake cluster occurrence, laser power-dropout events, seasonality of births and conceptions, DNA chains, human gait under normal, stress and neurodegenerative conditions, and respiratory and heartbeat time series under several stress conditions. We have developed a stochastic measure of the fluctuations around the ballistic growth of fatigue crack damage. We have also studied complex patterns in mathematical sequences such as the distance between prime numbers.
Geophysics:
The complexity of geophysical phenomena arises from the intrinsic variety and complexity of the mechanisms that concur to such phenomena and, therefore, the challenge is separating the various mechanisms that contribute to them. Together with my collaborators we have studied solar flare intermittency and concluded that the entire solar activity, which includes also sunspot number and total solar irradiance records, presents a fractal Levy-walk statistics which characterizes the turbulent solar behavior. We have studied the influence of the solar activity on the global temperature records; these studies suggest that the climate is sensitive to solar activity also on short time scales (> 1 month) and that strong positive feedbacks to solar variations must be present in climate. We have also developed sophisticated and powerful methods to evaluate climate simulations based on scale-by-scale multiresolution correlation evaluations; these methods can be use to pinpoint the flaws of the model simulations and, in turn, can be used to significantly improve the global circulation models which are used to simulate climate. We have studied earthquake occurrence in California and in other regions and concluded that the earthquake network present specific correlation patterns that suggest that the basic earthquake models, which are based on some hypothesis of randomness such as Generalized Poisson model, should be improved by adding correlation mechanisms. The modeling of such correlation mechanisms can be fundamental to forecast future shocks.
Sun and
Global Warming:
Finally, our study focused on developing a phenomenological multiscale model to estimate the solar contribution to global warming during the last century. Current energy balance climate models seems to underestimate the solar impact on climate by 1.5-3 times. It seems that the increase of solar activity during the 20th century might be responsible of approximately 50% of the global warming, but this contribution was not uniform during the century. The sun might have contributed 75% of the global warming during the first half of the century (1900-1950) but only 30% during the second half of the century (1950-2000). Thus, our findings would confirm that the sun played a dominant role in climate change in the early past, as several empirical studies would suggest. However, anthropogenic-added climatic forcing might have progressively played a dominant role in climate change during the last century and, in particular, during the last decades.
Biophysics:
Synchronization and pseudo-periodic rhythmic processes are ubiquitous in living organisms. These rhythms arise from stochastic and nonlinear biological mechanisms interacting with a fluctuating environment. Understanding, modeling and/or controlling such biological rhythms is the basic purpose of biophysical models. Together with my collaborators I have developed a particular nonlinear stochastic neural network, called super central pattern generator made with a stochastic neural network coupled to a nonlinear central pattern cyclical generator, for simulating human gait stride interval time series. The stochastic and nonlinear control parameters allow simulating the gait patterns under several stress and neurodegenerative conditions. Moreover, we have studied complex patters in cardiac rhythm in vivo experiments and identified their evolution under progressive central hypovolemia and acute hypobaric hypoxia. We have studied the coupling of the cardiac rhythm with the respiratory system and found that biological mechanical ventilators, which reproduce the natural rhythm of the respiratory system, have better performance than the periodic mechanical ventilators. We have also studied DNA chains and concluded that they present multiple persistent scaling patterns with a prevalence of fractal Gaussian properties within short and medium range (almost < 200 nucleotides) intervals and a prevalence of mixed fractal Gaussian and fractal Levy-walk statistics on long-range intervals that might suggest particular geometric genomic structures.
Social Biology:
The complexity of human phenomena arises from complex couplings of biological, economical and social mechanisms. By using traditional statistical methods of analysis, and filters based on the multiresolution wavelet analysis, together with my collaborators I have draw inferences about the times of the year when adolescent females, of different racial/ethnic and marital groups in Texas during the years 1964-2000, have the highest probability for pregnancy ending in live birth. Multiple factors influencing teen pregnancy were identified and associated with temporal features of social, cultural, educational and familial processes. In particular, I detect links between unmarried teen conception times and school terms, and weekly birth patterns associated with scheduled c-sections that differ according to racial/ethnic groups. We have also found in these data persistent scaling patterns that might be associated with the persistence and mutation of human fashions.
Econophysics:
The coupling of complex economical and social nonlinear and stochastic mechanisms to explain econophysics phenomena seems evident. Together with my collaborators I have developed a nonlinear stochastic trade-investment model to explain the wealth distribution found in societies. The model depends on two stochastic control parameters, which measure the strength of the investment mechanism and the poverty of the society respectively, and a nonlinear parameter which measures the strength of social policies. The latter nonlinear control parameter and the stochastic poverty control parameter regulate the trade mechanism. The combined use of the nonlinear and the two stochastic mechanisms allows reproducing the Gamma distribution of wealth for low-middle classes and the Pareto tail for the rich class as found in society. Several implications about some theoretical principles on which the Classical and Neoclassical School of Economy are based can be draw from the model.
Teaching Experience:
I have had a variety of teaching and lecturing
experiences. I have presented several seminars about my research in many
universities and international conferences. At University of North Texas I
spent three years lecturing as teaching assistant in an undergraduate computer
astronomy class. My duty was to present four times per week a 45-minute lecture
about a particular experiment and, then, to supervise the students during the
actual experiment. For each computer lab section, I had to prepare a test for
the students and to evaluate it. My supervisor in Astronomy was Dr. Mike Fanelli. In addition, for a semester I had to correct the
undergraduate homeworks in General Physics II. I had
also the opportunity of preparing and presenting some lectures about
Statistical Mechanics at a graduate level for the momentary absence of the
professor. Moreover, for several years I was a tutor in physics and statistical
biology. These years I spent lecturing on these diverse topics has refined my
teaching philosophy that students must learn about the facts as well as the
process of science. In particular, I found particular important to personally
interact with the students and encourage them with enthusiasm and respect.
My scientific background allows me to teach several courses of physics at both undergraduate and graduate level such as General Physics I, General Physics II, Modern Physics, Quantum Mechanics, Statistical Mechanics, Astronomy. In particular, my research background allows me to teach Nonlinear Dynamics, Chaotic Systems and Fractals with multidisciplinary and computer programming assignments.
“Sun's Direct Role in Global Warming May Be Underestimated, Duke Physicists Report,” by Monte Basgall, Duke University News & Communications, Sept. 30, 2005. http://www.dukenews.duke.edu/2005/09/sunwarm.html http://www.physorg.com/news6892.html
“Solar Flares and Global Warming,” by Phil Schewe, James Riordon, and Ben Stein, Physics News Update 642 #2, June 19, 2003. http://www.aip.org/enews/physnews/2003/split/642-2.html
“Less lovin' in summer,” by Philip Ball, Nature ScienceUpdate, 3 June 2002. http://www.nature.com/nsu/020527/020527-15.html
Book in preparation:
“Introduction to Measures of Complexity”, N. Scafetta and B.J. West
“Disrupted
network: climate change”, N. Scafetta and B.J. West.
2008
41) K.F. Froehlich, M.R. Graham, T.G. Buchman, L.G. Girling, N. Scafetta, B.J. West, E.K-Y. Walker, B.M. McManus and W.A.C. Mutch, “Physiological Noise versus White Noise to Drive a Variable Ventilator in a Porcine Model of Lung Injury,” submitted to the Canadian Journal of Anesthesia. (2007-8).
40) Nicola Scafetta, "Comment on ``Heat capacity, time constant, and sensitivity of Earth's climate system' by Schwartz." In press on J. Geophys. Res. (2008). PDF
39) Erik Kabela and Nicola Scafetta, “Solar Effect and Climate Change,” BULLETIN OF THE AMERICAN METEOROLOGICAL SOCIETY Volume: 89 Issue: 1 Pages: 34-35 Published: 2008 PDF
38) Nicola Scafetta and Bruce J. West, “Is climate sensitive to solar variability?” Physics Today, 3 50-51 (2008). PDF
37) Ivy F. Forkner, Claude A. Piantadosi, Nicola Scafetta, Richard E. Moon, “Hyperoxia-Induced Tissue Hypoxia: A Danger?Reply to MS #200707041,”, Anesthesiology, 108 169-170 Article Number: ISSN 0003-3022 Article Number: ISSN 0003-3022 (2007-8). PDF
2007
36) Nicola Scafetta, and Bruce J. West, “Phenomenological reconstructions of the solar signature in the NH surface temperature records since 1600.” J. Geophys. Res., 112, D24S03, doi:10.1029/2007JD008437 (2007). PDF
35) Nicola Scafetta, and Bruce J. West, “Emergence of bi-fractal time series from noise via allometric filters.” European Physical Letters 79, 30003, (2007). PDF
34) Ivy F. Forkner, Claude A. Piantadosi, Nicola Scafetta, Richard E. Moon, “Hyperoxia-Induced Tissue Hypoxia: A Danger?,” Anesthesiology 106, 1051-5 (2007). PDF
33) Nicola Scafetta, Richard Moon, and Bruce J. West, “Fractal Response of Physiological Signals to Stress Conditions, Environmental Changes and Neurodegenerative Diseases,” Complexity 12, 12-17 (2007). PDF
32) Nicola Scafetta,
and Bruce J. West, “Probability distributions in conservative energy
exchange models of multiple interacting agents”, J. Phys.: Condens. Matter 19 065138 (18pp)
doi:10.1088/0953-8984/19/6/065138 (2007). PDF
2006
(31)
Nicola Scafetta,
Richard Moon, and Bruce J. West, “Physiological signals and their fractal
response to stress conditions, environmental changes and neurodegenerative
diseases. ” in the proceedings of The 25th Army Science Conference (ASC),
(30) Nicola Scafetta and Bruce J. West
, “Phenomenological solar signature in 400 years of reconstructed Northern
Hemisphere temperature record,” Geophys. Res. Lett., 33, doi:10.1029/2006GL027142. (2006). PDF
(29) Nicola Scafetta and Bruce J. West,
‘‘Reply to comments by J. Lean on “Estimated solar
contribution to the global surface warming using the ACRIM TSI satellite
composite”, Geophys.
Res. Lett., 33, doi:10.1029/2006GL025668. (2006).
PDF
(28) Richard
Moon, Lynn Eschenbacher and Nicola Scafetta, “Perioperative Respiratory Depression and Monitoring”,
chapter in Pain Management and Patient-Controlled Analgesia: Improving Safety
and Quality of Care, Proceedings from The Sixth Conference Center for
Medication Safety and Clinical Improvement San Diego, CA. (2006).
(27) Nicola Scafetta
and Bruce J. West, “Phenomenological
solar contribution to the 1900-2000 global surface warming,” Geophys.
Res. Lett., 33, L05708, doi:10.1029/2005GL025539
(2006). PDF
(26) Nicola
Scafetta, Asok Ray
and Bruce J. West, “Correlation regimes in fluctuations of fatigue crack
growth,” Physica A 359, 1-23 (2006). PDF
2005
(25) Nicola Scafetta
and Bruce J. West, “Estimated solar contribution to the global surface
warming using the ACRIM TSI satellite composite,” Geophys.
Res. Lett., 32(24), doi:10.1029/2005GL023849 (2005). PDF
(24) Nicola Scafetta and Bruce J. West, “Multiscaling comparative analysis of time series and geophysical phenomena,” Complexity 10(4) 51-56. PDF
(23) Bruce J. West and Nicola Scafetta, “A Multifractal Dynamical Model of Human Gait”, Conference proceedings of the International Symposium on Fractals in Biology and Medicine vol. IV, in Ascona, Switzerland March 9. Preprint PDF
2004
(22) Nicola Scafetta and Bruce J. West, “Multi-scaling comparative analysis of time series and a discussion on ‘earthquake conversations’ in California” Phys. Rev. Lett. 92 138501 (2004). PDF
(21) Bruce J. West, Nicola Scafetta, William Cooke and Rita Balocchi, “Influence of progressive central hypovolemia on multifractal dimension of cardiac interbeat intervals,” Annals of Biomedical Engineering, 32 1077-1087 (2004). PDF
(20) Nicola Scafetta, Sergio Picozzi and Bruce J. West, “An out-of-equilibrium model of the distributions of wealth” Quantitative Finance 4, 353-364 (2004). PDF
(19) Nicola Scafetta, Bruce J. West and Sergio Picozzi, “A trade-investment model for distribution of wealth,” on a special issue of Physica D "Anomalous Distributions, Nonlinear Dynamics, and Nonextensivity" 193 338–352 (2004). PDF
(18) Nicola Scafetta, Paolo Grigolini, Patti Hamilton and Bruce J. West, “Non-extensive diffusion entropy analysis and teen birth phenomena,” Chapter in: “Nonextensive Entropy: Interdisciplinary Applications,” M. Gell-Mann and C. Tsallis Eds., Oxford University Press (2004). Preprint PDF
(17) Nicola Scafetta, Timothy Imholt, J.A. Roberts and Bruce J. West, “An intensity-expansion method to treat non-stationary time series: an application to the distance between prime numbers.” Chaos, Solitons & Fractals 20, 179 (2004). PDF
(16) Nicola Scafetta and Bruce J. West, “Multiresolution Diffusion Entropy Analysis of time series: an application to births to teenagers in Texas” Chaos, Solitons & Fractals 20, 119 (2004). PDF
(15) Nicola Scafetta, Paolo Grigolini, Timothy Imholt, J.A. Roberts and Bruce J. West, “Solar turbulence in earth's global and regional temperature anomalies” Phys. Rev. E 69, 026303 (2004). PDF
(14)
Nicola Scafetta, Elizabeth Restrepo and Bruce J. West, “Seasonality of birth and
conception to teenagers in
(13) Nicola Scafetta and Bruce J. West, “Complexity, multiresolution, non-stationarity and entropic scaling: Teen birth thermodynamics” Journal of Mathematical Sociology Volume 28, Number 4 / October–December, 229 - 259 (2004). PDF
2003
(12) P. Allegrini, V. Benci, P. Grigolini, P. Hamilton, M. Ignaccolo, G. Menconi, L. Palatella, G. Raffaelli, Nicola Scafetta, M. Virgilio, J. Yang, “Compression and Diffusion: A Joint Approach to Detect Complexity,” Chaos, Solitons & Fractals 15 (3), 517-535 (2003). PDF
(11) Nicola Scafetta, Lori Griffin and Bruce J. West, “Holder exponent spectra for human gait,” Physica A 328, 561, 15 Oct (2003). PDF
(10) Bruce J. West and Nicola Scafetta, “A non linear model for human gait,” Phys. Rev. E 67, 051917 (2003). Selected for the Virtual Journal of Biological Physics Research 5 June 1, 2003. PDF
(9) Nicola Scafetta and Bruce J. West, “Solar Flare Intermittency and the Earth's Temperature Anomalies,” Phys. Rev. Lett. 90, 248701 (2003). PDF
2002
(8) Paolo
Grigolini, Deborah Leddon, Nicola
Scafetta, “The Diffusion entropy and
waiting time statistics of hard x-ray solar flares,” Phys. Rev. E 65, 046203 (2002). PDF
(7) Nicola Scafetta, Vito Latora and Paolo Grigolini, “Lévy statistics in coding and non-coding nucleotide sequences,” Physics Letters A 299 (5-6), 565-570 (2002). PDF
(6)
Nicola Scafetta, Vito Latora and Paolo Grigolini, “Lévy Scaling: The diffusion entropy method
applied to the
(5) Nicola Scafetta, and Paolo Grigolini, “Scaling detection in time series: diffusion entropy analysis,” Phys. Rev. E 66, 036130 (2002). PDF
2001
(4) Gerardo Aquino, Paolo Grigolini, Nicola Scafetta, “Sporadic Randomness, Maxwell's Demon and the Poincare' recurrence times,” Chaos, Solitons & Fractals 12, 2023-2038 (2001). PDF
(3) Nicola Scafetta, Patti Hamilton and Paolo Grigolini, “The Thermodynamics of Social Process: the Teen Birth Phenomenon,” Fractals, 9, 193-208 (2001). PDF
(2) Nicola Scafetta, “An entropic approach to the analysis of time series.” Ph. D. Dissertation, University of North Texas (USA) Physics (2001). PDF
1997
(1) Nicola Scafetta, “Breakdown of the Renormalization group approach to slow relaxation processes.” Tesi di laurea: Universita’ di Pisa (Italy) Physics, (1997).
Submitted Works and/or works in progress:
Some preprints can be found in http://arXiv.org/find/scafetta
“Influence of Acute Hypobaric Hypoxia on Hölder exponent distributions of inter-breath intervals and tidal volume”
“Model predictions of stride interval time series of the elderly and individuals with neurodegenerative disease”
“Temperature reconstruction analysis”
Scientific Conferences and Presentations:
2007
"Solar dynamics, global warming and beyond: A
discussion about the science of complexity." Nicola Scafetta, Invited Speaker, Dept. of Physics, University of North
Carolina - Greensboro April 18/2008.
"Is the Sun Warming the Climate?" Nicola Scafetta, Invited Speaker,
John Locke Foundation
“How
important are PMOD and ACRIM TSI satellite composites for the global warming
debate?” N. Scafetta with B.J. West.
Invited speaker at the American Geophysical Union (AGU 2007) Joint Assembly,
“The phenomenological
solar effect on climate” N. Scafetta with
B.J. West. Invited speaker at the American Geophysical Union (AGU 2007) Joint
Assembly,
“Variation of
solar irradiance and their implications for climate change,” N. Scafetta with R. Willson,
Invited speaker at the Geological Society of America, Denver Annual Meeting
(28–31 October 2007).
“After
general anesthesia inter-breath interval is correlated with sleep stage but not
end-tidal PCO2,”
“The
Average is Truly Exceptional”, N. Scafetta with B.J.
West, keynote talk at SCIPS, Chapman University, Orange CA, July 27, 2007.
“Where
Medicine Went Wrong”, N. Scafetta with B.J.
West, keynote talk at Plexus Institute, Kansas, Circle S Ranch,
July 24, 2007.
“The
Average Person is Truly Exceptional,” N. Scafetta with
B.J. West, at DoD Biotechnology HPC Software
Applications Institute at Ft. Detrick, June 7, 2007.
“Fractal
Calculus Modeling Physiologic Networks,” N. Scafetta with
B.J. West, at DoD Biotechnology HPC Software
Applications Institute at Ft. Detrick, June 7, 2007.
"Phenomenological
reconstructions of the solar signature in the NH surface temperature records
since 1600." N.
Scafetta. Invited speaker at the Palmetto Chapter of the American
Meteorological Society,
“Global
warming and complexity: is there a strong but subtle solar signature behind
global climate change?”, N. Scafetta, at
the International Workshop on Understanding Complex Systems, University of
Illinois at Urbana-Champaign, 14-17 May, 2007.
“The Fractional Calculus and Dynamic
Fractals,” N. Scafetta with B.J. West invited talk
2006
(38) “A
phenomenological reconstruction of the solar signature in 400 years of global
surface temperature records,” N. Scafetta
with B.J. West. Invited speaker at the American Geophysical Union (AGU 2006)
Joint Assembly,
(37) “Physiological signals and their fractal response to stress conditions,
environmental changes and neurodegenerative diseases.” N. Scafetta, R. Moon, and B.J. West, The 25th Army
Science Conference (ASC),Orlando, Florida, November 27-30, (2006).
(36) “Phenomenological
solar signature in 400 years of reconstructed Northern Hemisphere temperature
record”, N. Scafetta with B.J. West.
Invited speaker, Second International Conference on Global Warming,
(35) “Phenomenological solar signature in 400 years of reconstructed
Northern Hemisphere temperature record”, N. Scafetta
with B.J. West. Invited speaker, Universita' di Trento, Department of Environmental Engineerin,
May 1, 2006.
(34) “Is the Sun Warming the
Earth and is its Contribution to Climate Change Underestimated by Climate
Models? A Phenomenological Study on Global Warming,” N. Scafetta with B.J.
West. Invited speaker,
(33) “An out-of-equilibrium model of the distributions of
wealth”, ,”
(32) “Is the Sun
Warming the Earth and is its Contribution to Climate Change Underestimated by
Climate Models? A Phenomenological Study on Global Warming,” N. Scafetta
with B.J. West. Invited speaker,
2005
(31) “Estimate solar
contribution to the global surface warming using the ACRIM TSI satellite
composite,” N. Scafetta with B.J.
West. Invited speaker at the American Geophysical Union (AGU) 2005 Joint
Assembly,
(30)“Fractal breathing characteristics after upper abdonimal surgery” N. Scafetta with R.E. Moon, SLars L Mielke, Fritz F Klein, and Bruce J West , at the American Society of Anesthesiologists.
(29) “A Critical Review of Models of Composite Total Solar Irradiance,” N. Scafetta. Invited speaker and chair of section SH22B at the American Geophysical Union (AGU) 2005 Joint Assembly, New Orleans, LA, USA, 23-27 May.
(28) “An out-of-equilibrium model of the distributions of wealth and income in society”, N. Scafetta with S. Picozzi and B.J. West, at the International Workshop on Understanding Complex Systems, University of Illinois at Urbana-Champaign, 16-19 May.
(27) “Fractal Response of Physiological Signals to Stress Conditions, Environmental Changes and Neurodegenerative Diseases.”, N. Scafetta with R.E. Moon and B.J. West, at the International Workshop on Understanding Complex Systems, University of Illinois at Urbana-Champaign, 16-19 May.
2004
(26) “Climate sensitivity to solar activity: The contribution of solar cycles 21-23 to global mean surface warming,” N. Scafetta with B.J. West. Invited talk at the American Geophysical Union (AGU) 2004 Joint Assembly, San Francisco, CA, USA, 13-17 December, 2004.
(25) “The Fractal Nature of Breathing during Hypobaric Hypoxia”, N. Scafetta with R.E. Moon, S. Bar-Yosef, B.W. Stolp, G. del Dear, C. A Piantadosi, and B.J. West, presented at the American Society of Anesthesiologists meeting held in Las Vegas, Nevada, on 23-27 October, 2004.
(24)“Detecting Levy and fractal Gaussian Intermittency in Geophysical Phenomena”, N. Scafetta with B.J. West, at the International Workshop on Understanding Complex Systems, University of Illinois at Urbana-Champaign, 17-20 May.
(23)“The anthropogenic factor in the Gamma-Pareto distributions of wealth”, N. Scafetta with S. Picozzi and B.J. West, at the Center for Nonlinear Science at Physics Department, Duke University, 27 April.
(22) “Detecting Levy and fractal Gaussian Intermittency in Geophysical Phenomena”, N. Scafetta with B.J. West, at the American Geophysical Union (AGU) 2004 Joint Assembly, Montreal, Quebec, Canada, 17-21 May.
(21) “Solar Intermittency in earth’s global and regional temperature anomalies”, N. Scafetta with B.J. West, presented at Physics Department, Texas Tech University, Lubbock, 8 April.
(20) “Introduction to Fractals, Networks & Power Laws: How Biology and Medicine Fit In”, N. Scafetta with B.J. West, presented at US Army Institute of Surgical Research Scientific Seminar, Ft. Sam Houston April 7.
(19) “A multifractal dynamical model of human gait”, N. Scafetta with B.J. West, presented at Fourth International Symposium on Fractals in Biology and Medicine in Ascona, Switzerland March 9.
(18) “Complexity produces strange kinetics and dynamics”, N. Scafetta with B.J. West, presented at Physics Department, Warclaw Technical University, Warclaw, Poland, March 7.
(17) “Introduction to Fractals, Networks & Power Laws: How Biology and Medicine Fit In”, N. Scafetta with B.J. West, presented at Warclaw Technical University, Medical School, Warclaw, Poland, March 4.
2003
(16) “Solar intermittency in earth’s global and regional temperature anomalies.” N. Scafetta with B.J. West, presented at Center for Nonlinear and Complex Systems, Physics Department, Duke University Mar. 25 2003, Durham (NC). Chaired by D. J. Gauthier.
(15) “Introduction to Fractals, Networks and Power Laws: How Biology and Medicine Fit In or The Importance of Variability”, N. Scafetta with B.J. West and L. Griffin, presented at University of Manitoba Winnipeg, Canada, May 29 presented at MedMath2003.
(14) “Solar intermittency in earth’s global and regional temperature anomalies.” N. Scafetta with B.J. West, presented at Civil and Environmental Department of Pratt school of Engineering. Duke University, Chaired by Roni Avissar. June 27 2003, Durham (NC).
(13) “Complexity produces strange kinetics and dynamics”, N. Scafetta and B.J. West, presented at the Center for Nonlinear Science at Physics Department, Duke Univeristy, October 7.
(12) “Complexity produces strange kinetics and dynamics”, N. Scafetta with B.J. West, presented at the Physics Department, University of Illinois, Chicago October 9.
(11) “Complexity produces strange kinetics and dynamics”, N. Scafetta and B.J. West, presented at the Physics Department, University of North Texas October 21.
(10) “On understanding walking: A nonlinear dynamical model of human gait”, N. Scafetta with B.J. West, presented at the second annual Duke University Postdoctoral research day, Duke University, October 24, 2003. Durham (NC).
(9) “A stochastic analysis of the solar and non-solar forcings on global climate during the solar cycles 21-23 (1978-2003).” N. Scafetta with B.J. West, presented at the second annual Duke University Postdoctoral research day, Duke University, October 24, 2003. Durham (NC).
(8) “The Fractal Nature of Breathing during Hypobaric Hypoxia”, N. Scafetta with R.E. Moon, A.M. Moon, H.J. Frederick, J.D. Archibald, B.W. Stolp, G. de L. Dear and B.J. West, presented at the American Society of Anesthesiologists. Anesthesiology 99 (Suppl):A1534, 2003, San Francisco, CA.
2002
(7) “Non-extensive diffusion entropy analysis and teen birth phenomena.” N. Scafetta with P. Grigolini, P. Hamilton and B.J. West, presented at the International Workshop on Interdisciplinary Applications of Ideas from Nonextensive Statistical Mechanics and Thermodynamics, Apr 8-12 2002, Santa Fe (NM). Co-Chaired by M. Gell-Mann and C. Tsallis, Santa Fe Institute.
(6) “Treating Non-stationarity in Time Series: an Interdisciplinary Approach to Analyzing Complex Phenomena.” N. Scafetta with B.J. West, presented at The first annual Duke University Postdoctoral research day, Duke University, May 24, 2002. Durham (NC).
(5) “Some History of the Renormalization Group and Scaling in the Theory of Complexity”, N. Scafetta with B.J. West, at ARO Workshop “Non-stationary time series: A theoretical, computational and practical challenge”, October 13-19, presented at Center for Nonlinear Science, University of North Texas.
(4) “Non-stationarity and fractal scaling in biological and mathematical systems.” N. Scafetta with B.J. West, presented at International Workshop on Diffusion Entropy and Related Techniques of Time Series Analysis. Oct 13-19 2002, Center for Nonlinear Science, University of North Texas, Denton (TX).
(3) “A trade-investment model for a Gamma-Pareto distribution of wealth.” N. Scafetta with S. Picozzi and B.J. West, presented at the International Workshop on Anomalous Distributions, Nonlinear Dynamics and Nonextensivity. Nov 6-9 2002, Santa Fe (NM). Co-Chaired by Alan R. Bishop, H. Swinney, Costantino Tsallis, Los Alamos - Santa Fe.
(2) “Fractal Physiology and Chaos in Medicine”, N. Scafetta with B.J. West and L. Griffin, presented at University of Texas Medical Branch on December 16, Galveston, TX.
2000
(1) “The
Thermodynamics of Social Process: the Teen Birth Phenomenon.” N. Scafetta with P. Hamilton and P. Grigolini,
at the International Workshop on nonextensive
entropy. June, 2000. Denton (TX). Co-Chaired by P. Grigolini
and C. Tsallis,