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Review of Scientific Instruments : Direct calibration of colloidal...

By: Xiaoting Hong and Gerold A. Willing

Description: The development of colloidal probe microscopy has made it possible to directly measure the interaction forces between two different surfaces in solution. Cantilever calibration is presently a subject of intense experimental and theoretical interest due to the need for accurate force measurement. We developed a novel and direct calibration method for colloidal probe cantilevers to which a silica microsphere has been previously attached based on fitting experi...

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Journal of Applied Physics : Single dominant distribution of Ge na...

By: Seishi Abe, Masato Ohnuma, D. H. Ping, and Shigehiro Ohnuma

Description: This paper investigates size distribution of Ge nanogranules embedded in Al oxide thin film prepared by rf reactive sputtering method. It is found from the results of x-ray diffraction and small angle x-ray diffraction spectroscopy that their mean sizes distribute bimodally or single dominantly with respect to sputtering process parameter of additional oxygen ratio in Ar and Ge concentrations. Compositional plane of these distribution types reveals that sing...

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Journal of Mathematical Physics : Reduction of nonhomogeneous quas...

By: Carmela Currò and Francesco Oliveri

Description: By using the invariance with respect to suitable Lie groups of point transformations, necessary and sufficient conditions are determined allowing one to map through an invertible point transformation nonhomogeneous and nonautonomous quasilinear 2×2 systems to homogeneous and autonomous form. The procedure is constructive and the new independent and dependent variables are obtained by determining the canonical variables associated with the Lie groups of point...

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Journal of Applied Physics : Magnetic structures and phase transit...

By: J. L. Wang, S. J. Campbell, A. J. Studer, M. Avdeev, M. Hofmann et al

Description: The magnetic properties and magnetic structures of PrMn2−xFexGe2 compounds (space group I4/mmm) have been investigated using magnetic, 57Fe Mössbauer effect (x = 1.0,1.3,1.6), and neutron diffraction measurements (x = 0.4,0.6,0.8,1.3) over the temperature range of 3–410 K. This has enabled the existing magnetic phase diagram for PrMn2−xFexGe2 to be extended from Fe concentration x = 0–1 to the full range x = 0–2 in terms of concentration and dMn–Mn, the intr...

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Journal of Applied Physics : Gallium oxide and gadolinium gallium ...

By: G. W. Paterson, P. Longo, J. A. Wilson, A. J. Craven, A. R. Long et al

Description: Test devices have been fabricated on two specially grown GaAs/AlGaAs wafers with 10 nm thick gate dielectrics composed of either Ga2O3 or a stack of Ga2O3 and Gd0.25Ga0.15O0.6. The wafers have two GaAs transport channels either side of an AlGaAs barrier containing a Si δ-doping layer. Temperature dependent capacitance-voltage (C-V) and current-voltage (I-V) studies have been performed at temperatures between 10 and 300 K. Bias cooling experiments reveal the ...

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Journal of Applied Physics : Texture formation in Ag thin films: E...

By: S. K. Bhagat and T. L. Alford

Description: Pure Ag films were deposited on SiO2/Si with and without introduction of W0.7Ti0.3 barrier layers. The films were annealed in vacuum for 1 h at temperatures up to 650 °C. X-ray diffraction pole figure analysis was used to investigate the texture information in as-deposited and annealed films. After annealing, the {111} texture in Ag films increased; however, the degree of increase was significantly higher in Ag/W–Ti/SiO2. In Ag/SiO2 structures, the {200} tex...

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Applied Physics Letters : Spin precession induced by an effective ...

By: Genhua Liu, Yonghai Chen, Caihong Jia, and Zhanguo Wang

Description: We theoretically study the spatial behaviors of the spin precession in a two-dimensional electron system with spin-orbit interaction. Through analysis of interaction between the spin and the effective magnetic field in the system, we obtain the general conditions to generate a persistent spin helix and predict a persistent spin helix pattern in [001] -grown quantum wells. Particularly, we demonstrate that the phase of spin can be locked to propagate in a qu...

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Journal of Applied Physics : On PbTiO3-(111)-Pt interfacial layers...

By: S. Habouti, C-H. Solterbeck, M. Es-Souni, and V. Zaporojtchenko

Description: In this work emphasis is placed on the investigation of interfacial layers between sol-gel processed PbTiO3 (PTO) thin films and (111)Pt terminated silicon substrates. The methods used are x-ray diffraction, x-ray photoelectron spectroscopy (XPS) combined with depth profiling, and atomic force microscopy (AFM). In order to avoid artifacts related to ion bombardment, e.g., reduction of Pb ions and preferential sputtering, gentle argon ion bombardment conditio...

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Journal of Applied Physics : Molecular second harmonic generation ...

By: I. Berline, C. Fiorini-Debuisschert, C. Royal, L. Douillard, and F. Charra

Description: We report the measurement of efficient second harmonic generation at a metallic tip immersed in a molecular solution of highly nonlinear molecules. The dependence of the signal either with the tip-to-substrate applied voltage or with the tip-to-substrate distance is studied. We show that the signal originates from the orientation of a limited number of molecules following local centrosymmetry breaking under the tip. The results are discussed within the conte...

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Biblioteca Hispanica : Programme Course Notions of Natural History

By: Sandalio of. Pereda and Martinez
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The Journal of Chemical Physics : Equilibrium fluctuations of the ...

By: D. I. Zhukhovitskii

Description: Spectra of the cluster surface equilibrium fluctuations are treated by decomposition into the bulk and net capillary ones. The bulk fluctuations without capillary ones are simulated by the surface of a cluster truncated by a sphere. The bulk fluctuation spectrum is shown to be generated primarily by the discontinuity in the spatial distribution of cluster internal particles. The net capillary fluctuation slice spectrum is obtained in molecular dynamics simul...

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Biblioteca Hispanica : Course of Natural History, Physiology and H...

By: Ramon Vigil Martinez
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Physics of Fluids : On the linear and nonlinear development of Gör...

By: Tandiono, S. H. Winoto, and D. A. Shah

Description: The linear and nonlinear developments of Görtler vortices were experimentally investigated by means of hot-wire anemometer measurement. The wavelengths of the vortices were preset to be the most amplified using thin perturbation wires. Three different vortex wavelengths of 12, 15, and 20 mm were considered. These wavelengths were preserved downstream which confirm the prediction of the most amplified wavelength of Görtler vortices. The onset of the nonlinear...

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Physics of Fluids : Digital particle image velocimetry of mammalia...

By: Paul Legac, Timothy Wei, Frank Fish, Terrie Williams, Russell Mark et al

Description:

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Biblioteca Hispanica : Discourse in Central University by Don Manu...

By: Manuel Lidon and Marco

Description: Biology

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Physics of Plasmas : Physics of collisionless phase mixing

By: D. Tsiklauri and T. Haruki

Description: Previous studies of phase mixing of ion cyclotron (IC), Alfvénic, waves in the collisionless regime have established the generation of parallel electric field and hence acceleration of electrons in the regions of transverse density inhomogeneity. However, outstanding issues were left open. Here we use the 2.5 D, relativistic, fully electromagnetic particle-in-cell code and an analytic magnetohydrodynamic (MHD) formulation, to establish the following points: ...

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Journal of Physical and Chemical Reference Data : Announcement: On...

By: Mark M. Cassar

Description: Polychlorinated dibenzo-p-dioxins (PCDDs) and polychlorinated dibenzofurans (PCDFs) are of global concern due to their persistence, their tendency to bioaccumulate, and their extremely high toxicity. The fate of the PCDD/Fs in the environment is largely determined by their physical-chemical properties, such as solubility in water (SW, mol m−3), solubility in octanol (SO, mol m−3), and vapor pressure (P, Pa). It is not unusual that the range of reported value...

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Journal of Mathematical Physics : Lagrangian and Hamiltonian two-s...

By: Johannes Giannoulis, Michael Herrmann, and Alexander Mielke

Description: Studying spatially extended Hamiltonian systems with coherent microstructure, it is an important and challenging problem to identify reduced Hamiltonian models that describe the effective dynamics on large spatial and temporal scales. Such models require macroscopically varying, deterministic initial data which can possess a well-organized microstructure. This paper concerns the question how reasonable macroscopic Lagrangian and Hamiltonian structures can be...

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Journal of Applied Physics : The influence of interfaces on the di...

By: R. Moucka, J. Vilcáková, N. E. Kazantseva, A. V. Lopatin, and P. Sáha

Description: In the present paper we report on the specific features of the dielectric properties of a MnZn ferrite/Al based composite. Previously, it has been shown that high-frequency magnetic losses in such hybrid composites (HCs) can be enhanced due to the formation of a core-shell-like structure of a composite, in which ferrite particles are immersed into a conducting medium formed by a continuous network of conducting particles that spans throughout the polymer mat...

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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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