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Full-Text Articles in Physics
Comment On "Performance Of Different Synchronization Measures In Real Data: A Case Study On Electroencephalographic Signals", R. B. Duckrow, Alfonso M. Albano
Comment On "Performance Of Different Synchronization Measures In Real Data: A Case Study On Electroencephalographic Signals", R. B. Duckrow, Alfonso M. Albano
Physics Faculty Research and Scholarship
Quian Quiroga [Phys. Rev. E 65, 041903 (2002)] reported a similar performance of several linear and nonlinear measures of synchronization when applied to the rat electrocorticogram (ECoG). However, they found that the mutual information measure did not produce robust estimates of synchronization when compared to other measures. We reexamined their data using a histogram method with adaptive partitioning and found the mutual information to be a useful measure of regional ECoG interdependence.
Comparative Study Of Embedding Methods, C. J. Cellucci, Alfonso M. Albano, P. E. Rapp
Comparative Study Of Embedding Methods, C. J. Cellucci, Alfonso M. Albano, P. E. Rapp
Physics Faculty Research and Scholarship
Embedding experimental data is a common first step in many forms of dynamical analysis. The choice of appropriate embedding parameters (dimension and lag) is crucial to the success of the subsequent analysis. We argue here that the optimal embedding of a time series cannot be determined by criteria based solely on the time series itself. Therefore we base our analysis on an examination of systems that have explicit analytic representations. A comparison of analytically obtained results with those obtained by an examination of the corresponding time series provides a means of assessing the comparative success of different embedding criteria. The …
Back And Forth Between Rydberg Atoms And Ultracold Plasmas, T. F. Gallagher, P. Pillet, M. P. Robinson, B. Laburthe-Tolra, Michael Noel
Back And Forth Between Rydberg Atoms And Ultracold Plasmas, T. F. Gallagher, P. Pillet, M. P. Robinson, B. Laburthe-Tolra, Michael Noel
Physics Faculty Research and Scholarship
By photoionizing cold, trapped atoms it is possible to produce ultracold plasmas with temperatures in the vicinity of 1 K, roughly 4 orders of magnitude colder than conventional cold plasmas. After the first photoelectrons leave, the resulting positive charge traps the remaining electrons in the plasma. Monitoring the dynamics of the expansion of these plasmas shows explicitly the flow of energy from electrons to the ionic motion, which is manifested as the expansion of the plasma. The electron energy can either be their initial energy from photoionization or can come from the energy redistribution inherent in recombination and superelastic scattering …
Millimeter-Wave Spectroscopy Of Cold Rb Rydberg Atoms In A Magneto-Optical Trap: Quantum Defects Of The Ns, Np, And Nd Series, Wenhui Li, I. Mourachko, Michael Noel, T. F. Gallagher
Millimeter-Wave Spectroscopy Of Cold Rb Rydberg Atoms In A Magneto-Optical Trap: Quantum Defects Of The Ns, Np, And Nd Series, Wenhui Li, I. Mourachko, Michael Noel, T. F. Gallagher
Physics Faculty Research and Scholarship
By using a magneto-optical trap we have measured the Rb ns-(n+1)s and nd(j)-(n+1)d(j) two-photon millimeter-wave transitions for 32less than or equal tonless than or equal to37, observing 100-kHz-wide resonances, in spite of the trap's 10 G/cm magnetic-field gradient, in which one might expect to observe resonances 5 MHz wide. This resolution is possible because of the similarity of the g(j) factors in the initial and final states. Under the same conditions, the single-photon ns-np resonances are similar to5 MHz wide. To make useful measurements of these intervals, we turned off the trap field and used the 300-K atoms of the …
Magnetic Core Loss Of Ultrahigh Strength Feco Alloys, Xuemei Cheng, X. K. Zhang, D. Z. Zhang, S. H. Lee, A. Duckham, T. P. Weihs, R. C. Cammarata, John Q. Xiao, C. L. Chien
Magnetic Core Loss Of Ultrahigh Strength Feco Alloys, Xuemei Cheng, X. K. Zhang, D. Z. Zhang, S. H. Lee, A. Duckham, T. P. Weihs, R. C. Cammarata, John Q. Xiao, C. L. Chien
Physics Faculty Research and Scholarship
Hiperco® 50 alloy heat treated between 450 and 650 °C exhibits superior mechanical properties. We report the measurements of the ac core loss at various frequencies up to 4500 Hz of the Hiperco® 50 alloy samples annealed at 450 and 650 °C. The 650 °C annealed specimens have lower ac core loss than the 450 °C annealed ones. The total core loss, consisting of contributions from hysteresis core loss and eddy-current core loss, depends on the frequency f as af+bf2. The eddy current loss of a single laminate is minor compared to the hysteresis loss.
Magnetic Properties Of Epitaxial Mn-Doped Zno Thin Films, Xuemei Cheng, C. L. Chien
Magnetic Properties Of Epitaxial Mn-Doped Zno Thin Films, Xuemei Cheng, C. L. Chien
Physics Faculty Research and Scholarship
Epitaxial ZnO thin film doped with 7% Mn have been made by reactive rf magnetron sputtering onto (1120) sapphire substrates at 400 °C. X-ray diffraction measurements reveal that the Zn0.93Mn0.07O film has a (0001) wurtzite single-crystal structure with a rocking curve width od 0.98°. UV-VIS absorption spectra show a band gap of 3.25 eV for pure ZnO films and 3.31 eV for the Zn0.93Mn0.07O film with states extending into the gap. The Auger electron spectroscopy shows homogeneous distribution of Mn in the film. The magnetic properties of the Zn0.93Mn0.07 …