World Library  


 
  • Cover Image

Applied Physics Letters : Direct measurement of the complex refrac...

By: B. Mills, C. F. Chau, E. T. F. Rogers, J. Grant-Jacob, S. L. Stebbings et al

Description: Using extreme ultraviolet XUV radiation from a high harmonic source, we observe diffraction from a single-layer self-assembled hexagonal array of 196 1.2 nm diameter polystyrene spheres. The Mie solution is used to predict the correct form factor for a single sphere and hence model the intensities of the observed diffraction peaks for the first three orders. By measuring the diffraction intensities in this way, we demonstrate a technique for obtaining the ...

Read More
  • Cover Image

Review of Scientific Instruments : Nanoscale lithography with freq...

By: Masayuki Hamada, T. Eguchi, K. Akiyama, and Y. Hasegawa

Description: A lithographic method to draw nanoscale structures by repetitive depositions of the tip material by field evaporation has been developed based on frequency-modulation atomic force microscopy (FM-AFM). Because of high stiffness of quartz tuning forks, a force sensor in the AFM, unwanted mechanical contact of the AFM tip with the substrate was prevented. Precise control of the tip-substrate gap distance with FM-AFM and a gold tip sharpened with focused ion bea...

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

Biblioteca Hispanica : Errors and Popular Concerns and Explanation...

By: Alejandro Pontes and Fernandez
Read More
  • Cover Image

Biblioteca Hispanica : the Universe in Your Pocket Useful Knowledg...

By: Biblioteca Hispanica

Description: Astronomy, Natural science.

Read More
  • Cover Image

Journal of Applied Physics : Magnetoresistance of a multilayered f...

By: A. V. Anisimov and A. P. Popov

Description: The method to calculate the electrical resistance of a multilayered film consisting of any finite number of ferromagnetic and nonmagnetic layers for a given collinear magnetic configuration is proposed. The problem is solved for the geometry when the current flows perpendicular to the film plane. The method is based on the description of the resistance of a multilayered film by the differential equation for the current polarization which satisfies two bounda...

Read More
  • Cover Image

Physics of Plasmas : Characterization of converging shock waves ge...

By: S. Efimov, A. Fedotov, S. Gleizer, V. Tz. Gurovich, G. Bazalitski et al

Description: Results of ∼ 200 kbar pressure generation at 50 μm distance from the implosion axis of the converging shock wave produced by an underwater electrical explosion of a cylindrical wire array are reported. The array was exploded using a submicrosecond high-current generator (stored energy of ∼ 4.2 kJ, current amplitude of ∼ 325 kA, rise time of ∼ 1 μs). Multiframe shadow imaging of the shock wave was used to determine its time of flight. These data were applied ...

Read More
  • Cover Image

Biblioteca Hispanica : Course of Natural History for the 2Nd Expan...

By: Francisco Cobeno Canovas
Read More
  • Cover Image

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...

Read More
  • Cover Image

The Journal of Chemical Physics : Constructing explicit magnetic a...

By: Jacob D. Stevenson, Aleksandra M. Walczak, Randall W. Hall, and Peter G. Wolynes

Description: By defining a spatially varying replica overlap parameter for a supercooled liquid referenced to an ensemble of fiducial liquid state configurations, we explicitly construct a constrained replica free energy functional that maps directly onto an Ising Hamiltonian with both random fields and random interactions whose statistics depend on the liquid structure. Renormalization group results for random magnets when combined with these statistics for the Lennard-...

Read More
  • Cover Image

Applied Physics Letters : Efficient readout of micromechanical res...

By: W. J. Venstra and H. S. J. van der Zant

Description: We present a method for efficient spectral readout of mechanical resonator arrays in dissipative environments. Magnetomotive drive and detection are used to drive double clamped resonators in the nonlinear regime. Resonators with almost identical resonance frequencies can be tracked individually by sweeping the drive power. Measurements are performed at room temperature and atmospheric pressure. These conditions enable application in high throughput resonant sensor arrays.

Read More
  • Cover Image

Physics of Fluids : Circulation and energy of the leading vortex r...

By: L. Gao, S. C. M. Yu, J. J. Ai, and A. W. K. Law

Description: The gravity-driven starting jet characteristics over the range of Reynolds numbers from 1179 to 10 611 have been investigated using planar laser induced fluorescence and particle image velocimetry. Of the 17 cases investigated, pinch off for the leading vortex was found to appear at Reynolds number above 3000. For those cases involving pinch off, limiting values for the nondimensional circulation for the leading vortex could be identified at around 1.26 and ...

Read More
  • Cover Image

The Journal of Chemical Physics : First-principles study of crysta...

By: Sheng Ju and Guang-Yu Guo

Description: Within the density functional theory with the generalized gradient approximation, we present a systematic ab initio investigation of crystal structure, electronic structure, and linear and nonlinear optical responses in a polar double perovskite Bi2ZnTiO6. The effect of B-site ordering is explored by comparing three possible configurations: A-type with alternative Zn and Ti layers stacking along the c axis; C-type with Zn and Ti c axis chains; and G-type wit...

Read More
  • Cover Image

Review of Scientific Instruments : Fast-charging compact seed sour...

By: M. Elsayed, M. Kristiansen, and A. Neuber

Description: Flux compression generators (FCGs) are some of the most attractive sources of single-use compact pulsed power available today due to their high energy density output and mobility. Driving FCGs requires some seed energy, which is typically provided by applying a high seed current, usually in the kiloampere range for midsized helical FCGs. This initial current is supplied by a high-current seed source that is capable of driving an inductive load. High-current ...

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

Journal of Applied Physics : CoCrPt-oxide based perpendicular reco...

By: S. N. Piramanayagam, K. Srinivasan, R. Sbiaa, Yan Dong, and R. H. Victora

Description: Writability of magnetic recording media with high anisotropy constant (Ku) is one of the major challenges encountered in extremely high density recording. A possible avenue to improve writability in perpendicular magnetic recording is to reduce the spacing between the writing head and the soft magnetic underlayer (SUL) or head-to-keeper spacing (HKS). A hybrid layer structure for reducing the HKS between the SUL and the writing head is investigated. The prop...

Read More
  • Cover Image

Review of Scientific Instruments : A new tensile stage for in situ...

By: Kalin I. Dragnevski, Trevor W. Fairhead, Rik Balsod, and Athene M. Donald

Description: We have developed a novel tensile stage that can be used for in situ electron microscopy examination of the mechanical properties of “superelastic” materials. In our stage, one of the specimen clamps is replaced by a cylindrical roller, which when driven by a motor can easily stretch (“roll on”) any specimen irrespective of its plastic properties. We have used the so-called Roll-o-meter in the study of the tensile behavior of two different film formed latex ...

Read More
  • Cover Image

Physics of Fluids : Evolution of neutral and charged droplets in a...

By: M. A. Fontelos, U. Kindelán, and O. Vantzos

Description: We study the evolution of drops of a very viscous and conducting fluid under the influence of an external electric field. The drops may be neutral or may be charged with some amount of electric charge. If both the external electric field and total drop charge are sufficiently small, then prolate spherical shapes develop according to Taylor’s observations. For sufficiently large charge and/or external field a self-similar conelike singularity develops in a me...

Read More
  • Cover Image

Journal of Applied Physics : Melting/collapse of charge orbital or...

By: M. Nadeem and M. J. Akhtar

Description: The aim of this article is to study the properties of the crystalline face centered cubic Ge1Sb2Te4 phase as a function of annealing and measuring temperature. This material is one of the stoichiometric members of the Ge:Sb:Te family, which is widely used in the phase change data storage and one candidate for multistate recording. The electrical properties of this material have been investigated using two independent methods, the four probe impedance and the...

Read More
  • Cover Image

Physics of Plasmas : Electrostatic solitary waves in a magnetized ...

By: S. K. Maharaj, R. Bharuthram, S. V. Singh, S. R. Pillay, and G. S. Lakhina

Description: The nonlinear evolution of driven low-frequency electrostatic waves is investigated in a three-component magnetized dusty plasma comprised of a warm dust fluid, electrons, and ions. Electrons as well as ions are considered to have Boltzmann distributions. The fluid equations for the dust along with the quasineutrality condition are used to obtain a single nonlinear differential equation for the electric field. Periodic solutions of the nonlinear differential...

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



Copyright © World Library Foundation. All rights reserved. eBooks from World eBook Library 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.