World Library  


 
  • Cover Image

Journal of Applied Physics : Tuning of magnetism in SrRuO3 thin fi...

By: B. W. Lee, C. U. Jung, M. Kawasaki, and Y. Tokura

Description: Control of the magnetic easy axis in SrRuO3 thin films is important for tunnel junction studies incorporating this layer and for wider device applications. Previously, we demonstrated control of the magnetic easy axis in SrRuO3 thin films on SrTiO3 (110) substrates by introducing tunable anisotropic strain through a CaHfO3 buffer layer. However, our method was not directly applicable due to the existence of twins in the CaHfO3 layer that grew on the SrTiO3 (...

Read More
  • Cover Image

Review of Scientific Instruments : Cutting down the forest of peak...

By: C. Carrasco, P. Ares, P. J. de Pablo, and J. Gómez-Herrero

Description: Acoustic dynamic force microscopy in liquids is a fundamental technique for the investigation of biological samples under physiological conditions. However, it shows an important drawback that consists of producing a myriad of resonance peaks, known as the forest of peaks, which hides the natural resonance frequency of the cantilever and prevents an optimum operation of the microscope. In this work, we propose a simple remedy for this problem, which consists...

Read More
  • Cover Image

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...

Read More
  • Cover Image

Applied Physics Letters : Retrieving effective parameters for quas...

By: Christoph Menzel, Carsten Rockstuhl, Thomas Paul, and Falk Lederer

Description: We introduce and compare two approaches for retrieving quantitatively the effective chirality of metamaterials at normal incidence. The retrieval employs either the reflected and transmitted amplitude of a plane wave illuminating a finite three-dimensional (3D) metamaterial or the dispersion relation of the pertinent Bloch modes in an infinite metamaterial. Both approaches are applied to characterize a 3D metamaterial consisting of a stack of metallic gammad...

Read More
  • Cover Image

Chaos : Asymmetric spatiotemporal chaos induced by a polypoid mass...

By: Yu Zhang and Jack J. Jiang

Description: In this paper, asymmetric spatiotemporal chaos induced by a polypoid mass simulating the laryngeal pathology of a vocal polyp is experimentally observed using high-speed imaging in an excised larynx. Spatiotemporal analysis reveals that the normal vocal folds show spatiotemporal correlation and symmetry. Normal vocal fold vibrations are dominated mainly by the first vibratory eigenmode. However, pathological vocal folds with a polypoid mass show broken symme...

Read More
  • Cover Image

Journal of Applied Physics : Transitions of epitaxially lifted-off...

By: C. M. N. Mateo, J. J. Ibañez, J. G. Fernando, J. C. Garcia, K. Omambac et al

Description: Low temperature photoluminescence and reflectance measurements on epitaxially lifted-off (ELO) bulk GaAs and GaAs/AlGaAs multiple quantum wells (MQWs) bonded to Si and MgO substrates are reported. Photoluminescence measurements indicate no strain at room temperature for the ELO bulk GaAs film but show biaxial strain at 10 K. Si-bonded films undergo tensile strain, while films with MgO host substrates experience compressive strain. Reflectance measurements at...

Read More
  • Cover Image

Journal of Applied Physics : Magnetoelectric properties of core-sh...

By: Rashed A. Islam, Vishwas Bedekar, Narayan Poudyal, J. Ping Liu, and Shashank Priya

Description: In this study, we report results on magnetoelectric (ME) core-shell Pb(Zr,Ti)O3 (PZT)-NiFe2O4 (NF) particulate nanocomposites. NF particles forming the shell had size in range of 20–30 nm. The grain size of sintered nanocomposites was found to be in the range of 500–800 nm. The sintered nanocomposite exhibited piezoelectric coefficient (d33) of 60 pC/N, dielectric constant of 865, and ME coefficient of 195 mV/cm Oe. High ME coefficient was observed for wide ...

Read More
  • Cover Image

Journal of Mathematical Physics : Weyl quantization of fractional ...

By: Vasily E. Tarasov

Description: The quantum analogs of the derivatives with respect to coordinates qk and momenta pk are commutators with operators Pk and Qk. We consider quantum analogs of fractional Riemann–Liouville and Liouville derivatives. To obtain the quantum analogs of fractional Riemann–Liouville derivatives, which are defined on a finite interval of the real axis, we use a representation of these derivatives for analytic functions. To define a quantum analog of the fractional Li...

Read More
  • Cover Image

Journal of Applied Physics : Spectroscopic characterization of las...

By: Nek M. Shaikh, Sarwat Hafeez, M. A. Kalyar, R. Ali, and M. A. Baig

Description: We present optical emission studies of the laser ablation brass plasma generated by the fundamental, second, and third harmonics of a neodymium doped yttrium aluminum garnet laser. The spectra predominantly reveal the spectral lines of the neutral and singly ionized copper and zinc. The excitation temperatures are determined by the Boltzmann plot method, whereas the electron number densities have been extracted from the Stark broadened line profiles. The spa...

Read More
  • Cover Image

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...

Read More
  • Cover Image

Biblioteca Hispanica : Programme Notions of Natural Science for Sc...

By: Luis Nata Gayoso
Read More
  • Cover Image

Physics of Fluids : Unsteady flow separation on slip boundaries

By: Francois Lekien and George Haller

Description: We derive analytic criteria for the location and angle of unsteady particle separation and reattachment in two-dimensional flows with free-slip boundary conditions. Our wall-based criteria show that, in general, fluid breakaway from the boundary takes place at locations different from either instantaneous or averaged stagnation points. Indeed, for time-varying flows, separation does not occur along a free streamline or along an average free streamline. We ap...

Read More
  • Cover Image

Biblioteca Hispanica : Rebuttals to Anti

By: Jose Gogorza and Gonzalez

Description: Evolutionism

Read More
  • Cover Image

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...

Read More
  • Cover Image

The Journal of Chemical Physics : Glassy properties and viscous sl...

By: Kristine Niss, Cécile Dalle-Ferrier, Valentina M. Giordano, Giulio Monaco, Bernhard Frick et al

Description: We present an extensive analysis of the proposed relationship [ T. Scopigno et al., Science 302, 849 (2003) ] between the fragility of glass-forming liquids and the nonergodicity factor as measured by inelastic x-ray scattering. We test the robustness of the correlation through the investigation of the relative change under pressure of the speed of sound, nonergodicity factor, and broadening of the acoustic exitations of a molecular glass former, cumene, and...

Read More
  • Cover Image

Review of Scientific Instruments : Efficient wavelet ridge extract...

By: Yu Dai, Qiang Ma, and Wenyan Tang

Description: A wavelet ridge extraction method is proposed for efficient estimation of instantaneous frequency and amplitude of the asymptotic signal. Inequalities are derived to provide limitations on scale interval and sampling frequency. The evaluation of optimal scale interval and sampling frequency at any given accuracy can be done by solving these inequalities and minimizing the computational complexity of continuous wavelet transform. After the continuous wavelet ...

Read More
  • Cover Image

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...

Read More
  • Cover Image

Review of Scientific Instruments : A nanotube based electron micro...

By: David E. Bordelon, Jian Zhang, Sarah Graboski, Adrienne Cox, Eric Schreiber et al

Description: A prototype cellular irradiator utilizing a carbon nanotube (CNT) based field emission electron source has been developed for microscopic image-guided cellular region irradiation. The CNT cellular irradiation system has shown great potential to be a high temporal and spatial resolution research tool to enable researchers to gain a better understanding of the intricate cellular and intercellular microprocesses occurring following radiation deposition, which i...

Read More
  • Cover Image

Journal of Applied Physics : Optical emission from a high-refracti...

By: Yuji Kuwamura, Minoru Yamada, Ryuichi Okamoto, Takeshi Kanai, and Hesham Fares

Description: An optical emission scheme was demonstrated, in which a high-refractive-index waveguide is excited by a traveling electron beam in a vacuum environment. The waveguide was made of Si–SiO2 layers. The velocity of light propagating in the waveguide was slowed down to 1/3 of that in free space due to the high refractive index of Si. The light penetrated partly into the vacuum in the form of a surface wave. The electron beam was emitted from an electron gun and p...

Read More
  • Cover Image

Review of Scientific Instruments : Velocity map imaging in time of...

By: M. Brouard, E. K. Campbell, A. J. Johnsen, C. Vallance, W. H. Yuen et al

Description: A new variation on time of flight mass spectrometry is presented, which uses a fast framing charge coupled device camera to velocity map image multiple product masses in a single acquisition. The technique is demonstrated on two photofragmentation processes, those of CS2 and CH3S2CH3 (dimethyldisulfide) at a photolysis wavelength of 193 nm. In both cases, several mass fragments are imaged simultaneously, and speed distributions and anisotropy parameters are ...

Read More
 
1
|
2
|
3
Records: 1 - 20 of 45 - Pages: 



Copyright © World Library Foundation. All rights reserved. eBooks from World eBook Fair are sponsored by the World Library Foundation,
a 501c(4) Member's Support Non-Profit Organization, and is NOT affiliated with any governmental agency or department.