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Chaos : Stability diagram for the forced Kuramoto model

By: Lauren M. Childs and Steven H. Strogatz

Description: We analyze the periodically forced Kuramoto model. This system consists of an infinite population of phase oscillators with random intrinsic frequencies, global sinusoidal coupling, and external sinusoidal forcing. It represents an idealization of many phenomena in physics, chemistry, and biology in which mutual synchronization competes with forced synchronization. In other words, the oscillators in the population try to synchronize with one another while al...

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Chaos : The organization of intrinsic computation: Complexity-entr...

By: David P. Feldman, Carl S. McTague, and James P. Crutchfield

Description: Intrinsic computation refers to how dynamical systems store, structure, and transform historical and spatial information. By graphing a measure of structural complexity against a measure of randomness, complexity-entropy diagrams display the different kinds of intrinsic computation across an entire class of systems. Here, we use complexity-entropy diagrams to analyze intrinsic computation in a broad array of deterministic nonlinear and linear stochastic proc...

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Journal of Applied Physics : Decomposition of methylene blue in wa...

By: Monica Magureanu, Daniela Piroi, Nicolae Bogdan Mandache, and Vasile Parvulescu

Description: The decomposition of methylene blue (MB) in aqueous solution was investigated using a dielectric barrier discharge in coaxial configuration operated in pulsed regime. The MB solution (volume = 300 ml, concentration = 50 mg/l) contained in a reservoir was circulated by a pump and made to flow as a film over the surface of the inner electrode of the plasma reactor. The best results were obtained when the discharge was operated in oxygen. The conversion of MB r...

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Review of Scientific Instruments : Design of a double diaphragm sh...

By: Ingo Stotz, Grazia Lamanna, Harald Hettrich, Bernhard Weigand, and Johan Steelant

Description: A double diaphragm shock tube facility for studying liquid-spray atomization and combustion-related phenomena at elevated pressures and temperatures is described. The present shock tube is specifically intended for the investigation of fundamental processes related to fluid disintegration and mixing under realistic engine conditions. Special features of the facility include a variable-area driver section to compensate for shock attenuation, a square test sec...

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Review of Scientific Instruments : Low-frequency mechanical spectr...

By: Xuebang Wu, Qiaoling Xu, Jiapeng Shui, and Zhengang Zhu

Description: A low-frequency mechanical spectroscopy approach for liquids was proposed for studying conformational transition of polymer chains in concentrated solutions. The technique is applied to aqueous solutions of a poly(ethylene oxide)-poly(propylene oxide)-poly(ethylene oxide) (PEO-PPO-PEO) triblock copolymer in order to determine if chain conformation is altered in response to temperature. Two transitions are revealed by mechanical spectra and verified by differ...

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Journal of Applied Physics : Selective transmittance of linearly p...

By: Viktor Leontyev, Nicholas G. Wakefield, Kyrylo Tabunshchyk, Jeremy C. Sit, Michael J. Brett et al

Description: Columnar thin films exhibiting linear polarization selectivity have been theoretically investigated and fabricated using the glancing angle deposition (GLAD) technique. The film structure employed an s-shaped columnar morphology that may be either smoothly bent or composed of discrete segments. Finite-difference time-domain and frequency-domain methods have been used to model these thin film structures numerically. Simulation results have yielded optimal geo...

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Journal of Mathematical Physics : Hydrodynamic type integrable equ...

By: Metin Gürses, Ismagil Habibullin, and Kostyantyn Zheltukhin

Description: The concept of integrable boundary conditions is applied to hydrodynamic type systems. Examples of such boundary conditions for dispersionless Toda systems are obtained. The close relation of integrable boundary conditions with integrable reductions in multifield systems is observed. The problem of consistency of boundary conditions with the Hamiltonian formulation is discussed. Examples of Hamiltonian integrable hydrodynamic type systems on a segment and a semiline are presented.

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The Journal of Chemical Physics : Effect of solvent polarization o...

By: Egor Vladimirov, Anela Ivanova, and Notker Rösch

Description: The solvent contribution λs to the reorganization energy of electron transfer can be estimated from averages of the potential energy gaps between neutral-pair and ion-pair states over an ensemble of structures generated from molecular dynamics simulations. Invoking a Marcus-type two-sphere model for charge separation and recombination in an aqueous environment, we explored the effect of a polarizable force field and noted a strong reduction of λs (by ∼ 45%) ...

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Chaos : Synchronization-based scalability of complex clustered net...

By: Xiaojuan Ma, Liang Huang, Ying-Cheng Lai, Yan Wang, and Zhigang Zheng

Description: Complex clustered networks arise in biological, social, physical, and technological systems, and the synchronous dynamics on such networks have attracted recent interests. Here we investigate system-size dependence of the synchronizability of these networks. Theoretical analysis and numerical computations reveal that, for a typical clustered network, as its size is increased, the synchronizability can be maintained or even enhanced but at the expense of dete...

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Applied Physics Letters : Real-time acoustic emission testing base...

By: L. Yang, Y. C. Zhou, W. G. Mao, and C. Lu

Description: The fracture type differentiation, quantification, and source identification are desirable and yet intractable in the acoustic emission (AE) testing of a complex coating system. In this letter, a technique combining wavelet transform and conventional AE parameter analysis was developed to study the tensile failure process of thermal barrier coatings in real time. It is demonstrated that the failure of thermal barrier coatings originates from surface vertical...

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Biblioteca Hispanica : Elements of Natural History Testo Work Sic ...

By: M. Ramos and Lafuente
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Physics of Plasmas : Consistent solution for space-charge-limited ...

By: Y. Feng and J. P. Verboncoeur

Description: The solution for space-charge-limited (SCL) currents in electron vacuum diodes with monoenergetic initial velocity is extended to the relativistic regime. Two types of solutions are found: Type I corresponds to zero steady state surface electric field (field emission with high enhancement factor), and Type II corresponds to a finite steady state surface electric field (other emission mechanisms). Our solution compares well to the classical space-charge-limit...

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Chaos : Cryptanalysis of a chaotic communication scheme using adap...

By: Ying Liu and Wallace K. S. Tang

Description: This paper addresses the cryptanalysis of a secure communication scheme recently proposed by Wu [Chaos 16, 043118 (2006) ], where the information signal is modulated into a system parameter of a unified chaotic system. With the Kerckhoff principle, assuming that the structure of the cryptosystem is known, an adaptive observer can be designed to synchronize the targeted system, so that the transmitted information and the user-specific parameters are obtained....

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Physics of Plasmas : Analysis and modeling of edge fluctuations an...

By: I. U. Uzun-Kaymak, P. N. Guzdar, R. Clary, R. F. Ellis, A. B. Hassam et al

Description: The Maryland Centrifugal Experiment [ R. F. Ellis et al., Phys. Plasmas 12, 055704 (2005) ] is a mirror machine designed to have a plasma axially confined by supersonic rotation and dominantly interchange stable by the radial shear in the azimuthal velocity. Nevertheless, residual fluctuations still persist. To investigate the presence of such fluctuations, an azimuthal array of 16 magnetic pickup coils at the edge region of the plasma has been employed. A c...

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Physics of Plasmas : Cutoff criteria of electronic partition funct...

By: D. Bruno, M. Capitelli, C. Catalfamo, and A. Laricchiuta

Description: Transport coefficients of equilibrium hydrogen plasma have been calculated by using different cutoffs of electronic partition functions and different sets of transport cross sections of electronically excited states. The selection of both the cutoff criterion and transport cross sections deeply affects the transport coefficients of the H, H+, e plasma mixture in the temperature range of 10 000–50 000 K and in the pressure interval of 1–1000 atm.

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Journal of Physical and Chemical Reference Data : Critically Evalu...

By: María Victoria Rouxa,Manuel Temprado,James S. Chickos and Yatsuhisa Nagano

Description: Experimental thermochemical properties of benzene, toluene, and 63 polycyclic aromatic hydrocarbons, published within the period 1878–2008 (over 350 references), are reported. Available experimental data for the enthalpies of combustion used to calculate enthalpies of formation in the condensed state, combined with sublimation, vaporization, and fusion enthalpies, are critically evaluated. Whenever possible, recommended values for these thermochemical proper...

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Applied Physics Letters : Enhanced four-wave mixing by atomic cohe...

By: Hai-Hua Wang, Dun-Mao Du, Yun-Fei Fan, Ai-Jun Li, Lei Wang et al

Description: We experimentally demonstrate an enhanced four-wave mixing FWM based on atomic coherence in a Pr3+:Y2SiO5 crystal. By employing coherent population return and fractional stimulated Raman adiabatic passage to prepare maximum atomic coherence in the crystal, an efficient FWM signal can be generated. By measuring the generated FWM signal, the time-dependent atomic coherence is monitored. Such an enhanced FWM in solids may have practical applications in nonlin...

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Biblioteca Hispanica : Program a Course of Natural History for the...

By: Joseph Albinana
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Review of Scientific Instruments : High-resolution Rydberg tagging...

By: Brant Jones, Jingang Zhou, Lei Yang, and C. Y. Ng

Description: By coupling a comprehensive tunable vacuum ultraviolet (VUV) laser system to a velocity-mapped ion imaging apparatus, we show that high-resolution high-n Rydberg tagging time-of-flight (TOF) measurements of nascent atomic photofragments formed by laser photodissociation can be made using single-photon VUV laser photoexcitation. To illustrate this single-photon Rydberg tagging TOF method, we present here the results of the VUV laser high-n Rydberg tagging TOF...

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Journal of Applied Physics : Synergic effect of carbon black and s...

By: Jinsong Leng, Haibao Lv, Yanju Liu, and Shanyi Du

Description: This paper presents a study on the effect of carbon black (CB) and short carbon fibers (SCFs) on shape memory polymer (SMP) actuation by applying electric current. The coexistence of CB and SCF electrically conductive networks, supporting each other, resulting in significant improvement of electrical properties, was supported by optical microscopy, while the roles of particulate and fibrous fillers were distinguished by scanning electron microscopy. In seque...

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