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Applied Physics Letters : Ultrafast carrier capturing in GaInP/Er,...

By: Y. Terai, K. Hidaka, K. Fujii, S. Takemoto, M. Tonouchi et al

Description: Carrier capturing in GaInP/Er,O-codoped GaAs (GaAs:Er,O) /GaInP laser diodes (LDs) was investigated by means of the threshold current density (Jth) of laser emission. The Er-doped LDs showed laser emission of the GaAs band edge at room temperature, and its Jth increases with the Er flow rate during the growth. In the dependence of Jth on reciprocal cavity length, the effective gain factor of the LDs decreased by the codoping of Er and O. These results r...

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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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Physics of Fluids : Modeling inertial particle acceleration statis...

By: S. Ayyalasomayajula, Z. Warhaft, and L. R. Collins

Description: Our objective is to explain recent Lagrangian acceleration measurements of inertial particles in decaying, nearly isotropic turbulence [ Ayyalasomayajula et al., Phys. Rev. Lett. 97, 144507 (2006) ]. These experiments showed that as particle inertial effects increased, the variance in the particle acceleration fluctuations was reduced, and the tails of the normalized particle acceleration probability density function (PDF) became systematically attenuated. W...

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Biblioteca Hispanica : Bachelor's Guide Work Very Useful to Studen...

By: Felix Married Sanchez
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Journal of Applied Physics : Synthesis of soft/hard magnetic FePt-...

By: Akihiro Makino, Akihiro Kazahari, Wei Zhang, Kunio Yubuta, Takeshi Kubota et al

Description: Since the glassy alloys have structural homogeneity on a nanoscopic scale and wide supercooled liquid region, ΔTx (temperature interval between glass transition and crystallization), these materials are recognized as promising micro/nano-materials for nanomachines or micro electro-mechanical systems (MEMS). As one of the micro/nano components, the hard magnetic one is immensely desired. We systematically investigated the effect of metalloids composition in F...

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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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Journal of Applied Physics : Time dependence of the electronic str...

By: Jun Onoe, Takahiro Ito, and Shin-ichi Kimura

Description: Time dependence of the electronic structure of an electron-beam (EB) irradiated C60 film (20–30 nm thick) has been examined using in situ high-resolution ultraviolet photoelectron spectroscopy. It is found that the electronic states of the C60 film have been changed continuously from an insulator (pristine C60 films) to a semiconductor and finally to a metal as EB-irradiation time increased. This can be explained by the increase in polymerization degree of a...

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Journal of Applied Physics : Vacancy generation during Cu diffusio...

By: M. Elsayed, V. Bondarenko, K. Petters, J. Gebauer, and R. Krause-Rehberg

Description: Positron lifetime and Doppler broadening spectroscopy were applied for a study of defect properties of semi-insulating GaAs after diffusion of copper. A 30 nm layer of Cu was deposited by evaporation to the undoped GaAs samples. The diffusion of Cu was performed during an annealing step at 1100 °C at different arsenic vapor pressures. The samples were quenched into room temperature water. The initial semi-insulating (SI) undoped GaAs sample shows no positron...

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Applied Physics Letters : Terahertz generation in multiple laser-i...

By: Meng-Ku Chen, Jae Hun Kim, Chia-En Yang, Stuart Shizhuo Yin, Rongqing Hui et al

Description: An investigation of the terahertz wave generation in multiple laser-induced air plasmas is presented. First, it is demonstrated that the intensity of the terahertz wave increases as the number of air plasmas increases. Second, the physical mechanism of this enhancement effect of the terahertz generation is studied by quantitatively measuring the intensity of the generated terahertz wave as a function of phase difference between adjacent air plasmas. It is fo...

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Biblioteca Hispanica : Lessons of Natural History Accompanied by T...

By: Jose Maria Pascual
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Review of Scientific Instruments : Semicircular bend testing with ...

By: F. Dai, K. Xia, and S. N. Luo

Description: We propose and validate an indirect tensile testing method to measure the dynamic tensile strength of rocks and other brittle solids: semicircular bend (SCB) testing with a modified split Hopkinson pressure bar (SHPB) system. A strain gauge is mounted near the failure spot on the specimen to determine the rupture time. The momentum trap technique is utilized to ensure single pulse loading for postmortem examination. Tests without and with pulse shaping are c...

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Journal of Mathematical Physics : Ice-water and liquid-vapor phase...

By: Mauro Fabrizio

Description: A model for the first order phase transitions as ice-water and liquid-vapor is proposed using the Ginzburg–Landau equation for the order parameter φ. In this model the density ρ is composed of two quantities ρ0 and ρ1 such that 1/ρ = 1/ρ0+1/ρ1, where ρ1 is strictly connected to the order parameter φ. By means of this decomposition, we are able to represent the Andrew diagram without the use of the heuristic van der Waals equation.

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Journal of Applied Physics : Optical properties of m-plane GaN qua...

By: Julien Renard, Benoit Amstatt, Catherine Bougerol, Edith Bellet-Amalric, Bruno Daudin et al

Description: We have studied the optical properties of m-plane GaN/AlN quantum dots and quantum wires. The photoluminescence, both on an ensemble of nanostructures and on single nanostructures, shows a strong degree of linear polarization perpendicular to the c-axis. Time-resolved photoluminescence evidences the strong reduction in the quantum confined Stark effect. Temperature dependence measurements suggest a difference in nonradiative processes between quantum dots and quantum wires.

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Physics of Fluids : A better nondimensionalization scheme for slen...

By: M. M. Weislogel, Y. Chen, and D. Bolleddula

Description: A scaling of the two-dimensional Laplacian operator is demonstrated for certain solutions (at least) to Poisson’s equation. It succeeds by treating the operator as a single geometric scale entity. The belated and rather subtle method provides an efficient assessment of the geometrical dependence of the problem and is preferred when practicable to the hydraulic diameter or term-by-term scaling for slender fully developed laminar flows. The improved accuracy f...

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Biblioteca Hispanica : Secrets of Nature

By: Geronimo Cortes
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Review of Scientific Instruments : Measurement of shock wave unste...

By: D. Estruch, N. J. Lawson, D. G. MacManus, K. P. Garry, and J. L. Stollery

Description: A new method to measure shock wave unsteadiness is presented. Time-resolved visualizations of the flow field under investigation are obtained using a high-speed schlieren optical system and the motion of the shock wave is determined by means of digital image processing. Information on the shock’s unsteadiness is subsequently derived with Fourier analysis. A sample study on shock unsteadiness in a shock-wave/turbulent boundary-layer interaction with separatio...

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Physics of Fluids : Viscous jet drawing air into a bath

By: Etienne Reyssat, Elise Lorenceau, Frédéric Restagno, and David Quéré

Description:

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Journal of Applied Physics : Extrusion formation mechanism on sili...

By: Ruling Chen, Jianbin Luo, Dan Guo, and Xinchun Lu

Description: Molecular dynamic simulation is applied in analyzing the deformation of silicon surface under the impact of large silica cluster. The mechanism of such a deformation is largely different from the cases of ion bombardment and indentation. With the impact of large silica cluster, the silicon surface is extruded due to the combinational effects of thermal spread, phase transformation, and crystallographic slip. It is found that thermal spread is the most signif...

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Physics of Plasmas : Existence of weakly damped kinetic Alfvén eig...

By: N. N. Gorelenkov

Description: A kinetic theory of weakly damped Alfvén eigenmode solutions strongly interacting with the continuum is developed for tokamak plasmas with reversed magnetic shear. It is shown that finite Larmor radius (FLR) effects are required for global eigenmode solutions. FLR effects induce multiple kinetic subeigenmodes and collisionless radiative damping. The theory explains the existence of experimentally observed Alfvénic instabilities with frequencies sweeping down...

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Journal of Applied Physics : Deep traps in GaAs/InGaAs quantum wel...

By: Vas. P. Kunets, T. Al. Morgan, Yu. I. Mazur, V. G. Dorogan, P. M. Lytvyn et al

Description: Remotely doped In0.35Ga0.65As layers of different coverages 6, 9, 11, and 13 ML were grown by molecular beam epitaxy on (100) GaAs. Quantum dot (QD) nucleation was observed in situ by reflection high-energy electron diffraction at 8 ML growth of In0.35Ga0.65As, while for 6 ML, only two-dimensional (2D) growth was observed. Atomic force microscopy, low temperature photoluminescence, and Hall effect measurements confirmed this transition from 2D to three-dimen...

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