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Chaos : Momentum distributions after double ionization

By: B. Eckhardt, J. Prauzner-Bechcicki, K. Sacha, and J. Zakrzewski

Description:

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Biblioteca Hispanica : Elementary Notions of Natural History

By: Alejandro Jose Martinez De La Raga
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Review of Scientific Instruments : Design and characterization of ...

By: Gautam Sinha and Gurnam Singh

Description: This paper presents the design and analysis of a multipurpose combined function magnet for use in accelerators. This magnet consists of three corrector magnets: (i) skew quadrupole, (ii) horizontal dipole, and (iii) vertical dipole magnets, along with the main sextupole magnet. The strength of the corrector magnets is smaller than that of the main sextupole magnet. The strength of all the four magnets can be varied independently. The excitation strength requ...

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Journal of Applied Physics : Effect of compensation and of metalli...

By: Joris Libal, Sara Novaglia, Maurizio Acciarri, Simona Binetti, Roman Petres et al

Description: In this work we present a study of a p-type Czochralski-grown Si ingot which was grown using 10% solar grade silicon (SoG-Si). As the SoG-Si contains a relatively high concentration of impurities including phosphorus, the electrical properties of the as-grown wafers from this ingot are affected by both the compensating dopants and other impurities. Measurements of the minority charge carrier lifetime in the as-grown material reveal very low values (4–8 μs). ...

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Journal of Applied Physics : Enhanced grain surface effect on magn...

By: P. Dey, T. K. Nath, P. K. Manna, and S. M. Yusuf

Description: We have investigated the effect of nanometric grain size on magnetic properties of La0.7Ca0.3MnO3 nanoparticles having average particle size (Φ) of ∼ 17 nm. Temperature dependence of field-cooled (FC) and zero-FC (ZFC) dc magnetization indicate the existence of two different types of relaxation processes: a relatively high temperature regime where there is a broad maximum of the ZFC curve at T = Tmax (>40 K) and another is a relatively low temperature regime...

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The Journal of Chemical Physics : Optical absorption of small silv...

By: M. Harb, F. Rabilloud, D. Simon, A. Rydlo, S. Lecoultre et al

Description: We present a joint theoretical and experimental investigation of the absorption spectra of silver clusters Agn (4 ≤ n ≤ 22). The experimental spectra of clusters isolated in an Ar matrix are compared with the calculated ones in the framework of the time-dependent density functional theory. The analysis of the molecular transitions indicates that the s-electrons are responsible for the optical response of small clusters (n ≤ 8) while the d-electrons play a cr...

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Journal of Applied Physics : Blue-green upconversion emission in Z...

By: E. de la Rosa, D. Solis, L. A. Díaz-Torres, P. Salas, C. Angeles-Chavez et al

Description: Strong blue-green cooperative upconversion emission was observed under infrared excitation in 70 nm average crystallite size ZrO2:Yb3+ nanocrystals prepared by sol-gel process. The structural characterization was performed by x-ray diffraction and high resolution transmission electron microscopy suggesting that crystalline phase of nanoparticles is controlled by active ion concentration. The cooperative absorption coefficient η ∼ 2.5×10−22 is four orders of ...

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Journal of Mathematical Physics : Analytic integrability of a Chua...

By: Jaume Llibre and Clàudia Valls

Description: We consider the system = a(z−a1x3−a2x2−bx), = −z, = −b1x+y+b2z, where a and b are parameters and b1 = 7/10, b2 = 6/25, a1 = 44/3, and a2 = 41/2. We analyze the existence of local and global analytic first integrals.

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Biblioteca Hispanica : Elements of Natural History, 1889

By: Philip Picatoste
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Journal of Applied Physics : Thermal transport properties of nanoc...

By: Chien-Neng Liao, Yu-Chu Wang, and Hsu-Shen Chu

Description: Grain-size dependent thermal conductivity of sputtered nanocrystalline Bi–Sb–Te thin films was measured by a 3ω method. By changing deposition temperature from 100 °C to room temperature, the mean grain size of the Bi–Sb–Te films decreased from 83 to 26 nm and the lattice thermal conductivity reduced from 0.79 to 0.45 W/mK proportionally. The effect of grain boundary on lattice thermal conductivity can be described by an effective thermal boundary resistance...

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Review of Scientific Instruments : Tunable VUV photochemistry usin...

By: Kaijun Yuan, Lina Cheng, Yuan Cheng, Qing Guo, Dongxu Dai et al

Description: In this article, we report an experimental method for studying tunable vacuum ultraviolet (VUV) photochemistry using the H-atom Rydberg tagging technique. In this method, two VUV laser light beams were generated using nonlinear four-wave mixing scheme in a single Kr gas cell: one VUV beam is fixed at the 121.6 nm wavelength to probe the H-atom product through the Lyman α transition, the other beam can be tunable for photodissociating molecules in the wavelen...

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Journal of Applied Physics : Self-doping and partial oxidation of ...

By: Sebastian Scholz, Qiang Huang, Michael Thomschke, Selina Olthof, Philipp Sebastian et al

Description: The performance of organic electronic devices, such as organic light emitting diodes, transistors, or organic solar cells, depends critically on the chemical composition of the metal/organic and organic/metal interfaces which inject or extract charges into or from the device. By combining a number of techniques, such as x-ray photoemission spectroscopy (XPS) sputter depth profiling, XPS itself, secondary ion mass spectrometry, and laser desorption/ionization...

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Applied Physics Letters : Effect of viscosity of base fluid on the...

By: Tsung-Han Tsai, Long-Sheng Kuo, Ping-Hei Chen, and Chin-Ting Yang

Description: This study aims to investigate the effect of viscosity of the base fluid on the thermal conductivity of nanofluids in which Fe3O4 nanoparticles are suspended in the base fluid composed of diesel oil and polydimethylsiloxane. Viscosity of the base fluid is varied by changing the volumetric fractions between both fluids. The measured thermal conductivity of nanofluids gradually approaches the value predicted by the Maxwell equation by increasing the viscosity....

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Journal of Applied Physics : Microstructure and crystal defects in...

By: J. R. Wang, Y. Z. Zhang, Z. Z. Ye, J. G. Lu, H. P. He et al

Description: Dislocations in the ZnMgO pleated nanosheets were observed from high-resolution transmission electron microscopy (TEM). The Burgers vector was identified as 1/3〈113〉 from the Fourier filtered TEM images. Raman spectra revealed that there were microstructure defects in the ZnMgO nanosheets with the increasing Mg content. The incorporation of the Mg impurities in the ZnMgO nanosheets may promote the congregation of oxygen vacancies and thus facilitate the gene...

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Biblioteca Hispanica : Inaugural Prayer Read at the University of ...

By: Antonio Casares and Rodrigo
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Physics of Fluids : Favorable pressure gradient turbulent flow ove...

By: Mark F. Tachie and Mohammad K. Shah

Description: This paper reports on experimental study of turbulent flows over straight and inclined transverse ribs of square and triangular cross sections attached to the bottom and top walls of an asymmetric converging channel. The pitch-to-height ratio of the ribs was 10. A particle image velocimetry technique was used to conduct extensive velocity measurements at channel midspan and in planes close to the leading and trailing edges of the inclined ribs. From these me...

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The Journal of Chemical Physics : Photodissociation dynamics of me...

By: Shih-Huang Lee

Description: We investigated the photodissociation dynamics of methyl formate-d (CH3OC(O)D) at 193.3 nm in a molecular-beam apparatus using undulator radiation as an ionization source. We measured kinetic-energy distributions, spatial angular anisotropies, and branching ratios of all photofragments. Fractions of energy release into product translation were calculated from the kinetic-energy distributions. Four primary dissociation pathways to asymptotes CH3O( 2E)+DCO( 2A...

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Physics of Plasmas : Role of secondary long wavelength structures ...

By: Jiquan Li and Y. Kishimoto

Description: The dynamics of secondary long wavelength structures (LWSs) in electron temperature gradient (ETG) driven turbulence are investigated by performing gyrofluid simulations and modeling analyses in a slab geometry with an emphasis of the underlying nonlinear interaction processes. It is shown that the back-reaction of the secondary LWS on the ambient fluctuations essentially contributes to saturating ETG instability and limiting the electron transport. The LWS ...

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Applied Physics Letters : Conformable coating of SiO2 on hydrother...

By: B. H. Chu, L. C. Leu, C. Y. Chang, F. Lugo, D. Norton et al

Description: Coating silicon dioxide on hydrothermally grown ZnO nanorods is demonstrated using a low temperature plasma enhanced chemical vapor deposition (PECVD) system.Wurtzite structured ZnO nanorods were prepared by spin coating ZnO nanocrystals onto plastics or glass substrates. Then, the nanorods were subsequently grown in a zinc nitrate solution. SiO2 was deposited by PECVD at 50 °C. No current could be measured through the patterned metal dots on the SiO2 coated...

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Applied Physics Letters : Coherent control of magnetization preces...

By: E. Rozkotová, P. Nemec, N. Tesarová, P. Malý, V. Novák et al

Description: We report single-color, time-resolved magneto-optical measurements in ferromagnetic semiconductor (Ga,Mn)As. We demonstrate coherent optical control of the magnetization precession by applying two successive ultrashort laser pulses. The magnetic field and temperature dependent experiments reveal the collective Mn-moment nature of the oscillatory part of the time-dependent Kerr rotation, as well as contributions to the magneto-optical signal that are not conn...

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