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Journal of Applied Physics : Two-dimensional junction identificati...

By: C.-S. Jiang, H. R. Moutinho, R. Reedy, M. M. Al-Jassim, and A. Blosse

Description: We report on a two-dimensional investigation of the p-n junction in multicrystalline silicon solar cells using scanning Kelvin probe force microscopy (SKPFM). The junction location and depth were identified by SKPFM potential measurement and subsequent data analysis, where a procedure taking bias-voltage-induced changes in the potential and electric field was developed to avoid the effects of surface Fermi level pinning. Device simulation supported the junct...

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Journal of Applied Physics : Optical properties of Yb3+ doped Lu3A...

By: Alessandra Toncelli, Mohamed Alshourbagy, and Mauro Tonelli

Description: Yb doped Lu3Al5O12 single crystal fibers has been grown with various Yb3+ ion concentrations: 2%, 5%, 10%, 15%, and 50% Yb doping levels. The diameter of the fibers is around 3 mm and their length is up to 110 mm. The fibers have been annealed in air at 1400 °C for 24 h to remove Yb2+ produced during the growth in the fibers. Structural characterization by x-ray diffraction method has been performed to confirm the monocrystalline phase and the orientation of...

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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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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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Journal of Applied Physics : Imaging of charge trapping in distort...

By: Masashi Ishii, Bruce Hamilton, and Nigel Poolton

Description: We have observed the distribution of electron trapping centers on distorted carbon nanotubes (CNTs) by a unique x-ray analysis technique that has both elemental and spatial selectivities. This technique involves the use of scanning probe microscopy (SPM) under synchrotron radiation excitation of the inner shell of carbon. The probe detects the Coulomb force that results from the relaxation of an electron bound to a defect site into the core hole state create...

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Journal of Applied Physics : Observation of coherent acoustic and ...

By: Alexandre A. Kolomenskii, Sergey N. Jerebtsov, Haidong Liu, Hong Zhang, Zuxin Ye et al

Description: Coherent acoustic and optical phonon oscillations in Bi nanowire samples were studied with a femtosecond pump-probe technique. Laser pulses of 50 fs excited simultaneously acoustic oscillations at a frequency of about 9.5 GHz and optical phonons in the terahertz range. The transmission signal of nanowires on a glass substrate and the signal of light scattered from freestanding nanowires were measured. The acoustic velocity in nanowires was found to be close ...

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Biblioteca Hispanica : Programme-summary of Natural History Items

By: Manuel Mir and Navarro
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Journal of Applied Physics : Adhesion and interfacial fracture tou...

By: Nima Rahbar, Kurt Wolf, Argjenta Orana, Roy Fennimore, Zong Zong et al

Description: This paper presents the results of a combined experimental and theoretical study of adhesion between hard and soft layers that are relevant to medical devices such as drug-eluting stents and semiconductor applications. Brazil disk specimens were used to measure the interfacial fracture energies between model parylene C and 316L stainless steel over a wide range of mode mixities. The trends in the overall fracture energies are predicted using a combination of...

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Physics of Fluids : Breakup of the tail of a bubble in a non-Newto...

By: Enrique Soto, Roberto Zenit, and Octavio Manero

Description:

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Biblioteca Hispanica : Elements of Natural History for Use by Seco...

By: Serafin Homes and Abad
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Chaos : Synchronization of a class of chaotic systems with fully u...

By: M. Roopaei and M. Zolghadri Jahromi

Description: In this paper, an adaptive sliding mode control method for synchronization of a class of chaotic systems with fully unknown parameters is introduced. In this method, no knowledge of the bounds of parameters is required in advance and the parameters are updated through an adaptive control process. We use our proposed method to synchronize two chaotic gyros, which has been the subject of intense study during the recent years for its application in the navigati...

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Applied Physics Letters : ZnO nanowire arrays: Optical scattering ...

By: Ramón Tena-Zaera, Jamil Elias, and Claude Lévy-Clément

Description: Arrays of ZnO nanowires with different lengths (0.5–2 μm) and diameters (100–330 nm) were electrodeposited to study the influence of the nanowire dimensions on light scattering. The nanowire length and diameter were found to be major parameters in modifying the intensity and the wavelength of the scattered radiation, respectively. A significant scattering for the whole visible wavelength range was attained in arrays of ZnO nanowires of ∼ 1.5 μm in length and...

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Journal of Applied Physics : Quasi-in-plane leaky modes in lasing ...

By: Lev M. Blinov, Gabriella Cipparrone, Alfredo Mazzulla, Pasquale Pagliusi, Vladimir V. Lazarev et al

Description: Using a planar cell consisting of a prism and a flat glass, we have carried out precise measurements of the angles at which quasi-in-plane leaky (QIPL) laser modes propagate within a thin layer of a cholesteric liquid crystal (CLC) doped with a laser dye. Both the prism and the glass have refraction indices higher than relevant CLC indices, therefore, the waveguide effect in CLC is excluded. For this type of almost thresholdless lasing neither mirrors nor di...

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Physics of Plasmas : Global particle-in-cell simulations of Alfvén...

By: Alexey Mishchenko, Roman Hatzky, and Axel Könies

Description: Global linear gyrokinetic particle-in-cell (PIC) simulations of electromagnetic modes in pinch and tokamak geometries are reported. The global Alfvén eigenmode, the mirror Alfvén eigenmode, the toroidal Alfvén eigenmode, and the kinetic ballooning modes have been simulated. All plasma species have been treated kinetically (i.e., no hybrid fluid-kinetic or reduced-kinetic model has been applied). The main intention of the paper is to demonstrate that the glob...

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Physics of Fluids : Boundary integral simulations of liquid emptyi...

By: Nazish Hoda and Satish Kumar

Description: We perform boundary integral simulations to understand the removal of Newtonian liquids from a model gravure cell. Two different configurations are considered. In the first configuration, there is a free surface and an outlet boundary, and the liquid is driven out of a cavity by a combination of horizontal substrate motion and an imposed pressure gradient; a similar model was used by Powell et al. [Trans. IChemeE, Part C 78, 61 (2000) ]. The percentage of li...

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Biblioteca Hispanica : Testing of a General Plan of Natural Scienc...

By: Francisco Carbonell and Bravo
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Applied Physics Letters : Directing the transportation of a water ...

By: Qian Feng Xu, Jian Nong Wang, Ian H. Smith, and Kevin D. Sanderson

Description: Directional transportation of a ball-like water droplet on a superhydrophobic (SH) surface has been experimentally demonstrated. A SH surface with a water contact angle of as high as 160° and a sliding angle close to 0° is prepared by a sol-gel method based on removable polymeric nanospheres. A designed path line is then created on the prepared SH surface. The contact angle possesses anisotropy on the patterned SH surface. When the tilted angle of the patter...

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Journal of Applied Physics : Efficient formation of surface relief...

By: Sung-Kwan Na, Jung-Sung Kim, Seok-Ho Song, Cha-Hwan Oh, Yang-Kyoo Han et al

Description: This paper reports a method for the efficient formation of surface relief grating (SRG) on azopolymer films in which gold nanoparticles are dispersed. The height and shape of the SRG, which were formed by a two-beam interference technique, were found to be dependent on the content of gold nanoparticles. The optimum concentration of gold nanoparticles for the efficient formation of SRG was confirmed by atomic force microscopy (AFM), and the height of SRG at t...

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Applied Physics Letters : Electronic structure of single-walled ca...

By: Hyung-Joon Shin, Sylvain Clair, Yousoo Kim, and Maki Kawai

Description: The electronic structures of single-walled carbon nanotubes on Ag(100) and on ultrathin insulating NaCl (100) /Ag(100) were studied using low-temperature scanning tunneling microscopy. The Fermi level of the nanotubes was shifted toward the conduction band on Ag(100), while it was shifted toward the valence band on NaCl films. We explain this opposite behavior by different basic mechanisms accounting for the Fermi level shifts. On the metal surface, the wor...

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Chaos : Winnerless competition principle and prediction of the tra...

By: Valentin Afraimovich, Irma Tristan, Ramon Huerta, and Mikhail I. Rabinovich

Description: Predicting the evolution of multispecies ecological systems is an intriguing problem. A sufficiently complex model with the necessary predicting power requires solutions that are structurally stable. Small variations of the system parameters should not qualitatively perturb its solutions. When one is interested in just asymptotic results of evolution (as time goes to infinity), then the problem has a straightforward mathematical image involving simple attrac...

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