World Library  


 
  • Cover Image

The Journal of Chemical Physics : Effect of solvent polarization o...

By: Egor Vladimirov, Anela Ivanova, and Notker Rösch

Description: The solvent contribution λs to the reorganization energy of electron transfer can be estimated from averages of the potential energy gaps between neutral-pair and ion-pair states over an ensemble of structures generated from molecular dynamics simulations. Invoking a Marcus-type two-sphere model for charge separation and recombination in an aqueous environment, we explored the effect of a polarizable force field and noted a strong reduction of λs (by ∼ 45%) ...

Read More
  • Cover Image

Journal of Applied Physics : Dynamics of optically injected two-di...

By: E. Ya. Sherman, R. M. Abrarov, and J. E. Sipe

Description: We investigate the charge and spin dynamics of optically injected currents in multiple quantum well structures using a hydrodynamic model. The dynamics is very complex even on time scales of the order of 1 ps due to the interplay of Coulomb forces, electron-hole drag effects, and nonlinearity of the equations of motion. Our analysis is based on a numerical approach employing an expansion of the calculated quantities in a Hermite–Gaussian basis. We calculate ...

Read More
  • Cover Image

Journal of Applied Physics : Synergic effect of carbon black and s...

By: Jinsong Leng, Haibao Lv, Yanju Liu, and Shanyi Du

Description: This paper presents a study on the effect of carbon black (CB) and short carbon fibers (SCFs) on shape memory polymer (SMP) actuation by applying electric current. The coexistence of CB and SCF electrically conductive networks, supporting each other, resulting in significant improvement of electrical properties, was supported by optical microscopy, while the roles of particulate and fibrous fillers were distinguished by scanning electron microscopy. In seque...

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 : Structural characterization of GaAs a...

By: N. Begum, M. Piccin, F. Jabeen, G. Bais, S. Rubini et al

Description: We report Raman studies of GaAs and InAs nanowires (NWs) grown on SiO2 and GaAs surfaces by means of catalyst-assisted molecular beam epitaxy. We have investigated several tens of NWs grown using either Mn or Au as a catalyst. The LO and TO phonon lines of the NWs showed an energy downshift and a broadening as compared to the lines usually observed in the corresponding bulk materials. A doublet is sometimes observed in the LO region due to the observation of...

Read More
  • Cover Image

The Journal of Chemical Physics : High-pressure melting curve of h...

By: Sergio M. Davis, Anatoly B. Belonoshko, Börje Johansson, Natalia V. Skorodumova, and Adri C. van Duin

Description: The melting curve of hydrogen was computed for pressures up to 200 GPa, using molecular dynamics. The inter- and intramolecular interactions were described by the reactive force field (ReaxFF) model. The model describes the pressure-volume equation of state solid hydrogen in good agreement with experiment up to pressures over 150 GPa, however the corresponding equation of state for liquid deviates considerably from density functional theory calculations. Due...

Read More
  • Cover Image

Physics of Fluids : Dynamics of prolate ellipsoidal particles in a...

By: P. H. Mortensen, H. I. Andersson, J. J. J. Gillissen, and B. J. Boersma

Description: The dynamical behavior of tiny elongated particles in a directly simulated turbulent flow field is investigated. The ellipsoidal particles are affected both by inertia and hydrodynamic forces and torques. The time evolution of the particle orientation and translational and rotational motions in a statistically steady channel flow is obtained for six different particle classes. The focus is on the influence of particle aspect ratio λ and the particle response...

Read More
  • Cover Image

Applied Physics Letters : Residual strain in nonpolar a-plane Zn1-...

By: J.-M. Chauveau, J. Vives, J. Zuniga-Perez, M. Laügt, M. Teisseire et al

Description: We investigate the dependence on Mg content of the lattice parameters and the surface morphology of nonpolar a-(112¯0) Zn1−xMgxO (x ≤ 0.55) grown by molecular beam epitaxy. The anisotropy of the lattice parameters gives rise to an unusual in-plane strain state in the ZnO QWs: tensile strain along [11¯00] and compressive strain along 0001 . For a Zn0.6Mg0.4O barrier, the strain in a ZnO QW reaches −1.3% along 0001 and +0.3% along [11¯00]. This induces a s...

Read More
  • Cover Image

Journal of Mathematical Physics : Reproducing kernel Hilbert C-mod...

By: Jaeseong Heo

Description: In this paper we discuss reproducing kernels whose ranges are contained in a C∗-algebra or a Hilbert C∗-module. Using the construction of a reproducing Hilbert C∗-module associated with a reproducing kernel, we show how such a reproducing kernel can naturally be expressed in terms of operators on a Hilbert C∗-module using representations on Hilbert C∗-modules. We prove that for each positive definite G-kernel associated with a cocycle there is a representati...

Read More
  • Cover Image

Journal of Physical and Chemical Reference Data : Wavelengths, Tra...

By: J. E. Sansonettia

Description: Energy levels, with classifications and uncertainties, have been compiled for the spectra of the neutral atom and all positive ions of sodium (Z=11). Wavelengths with classifications, intensities, and transition probabilities are also tabulated. In addition, ground states and ionization energies are listed. Where available, the hyperfine structure constants and the percentages of the leading components of the energy levels are included. For all ionization st...

Read More
  • Cover Image

Journal of Applied Physics : Comparison of sensitivities of carbon...

By: Masuhiro Abe, Katsuyuki Murata, Tatsuaki Ataka, and Kazuhiko Matsumoto

Description: The sensitivities of biosensors using top-gate-type carbon nanotube field-effect transistors (CNT-FETs) with and without a top metal gate were compared. The CNT-FET biosensor without the top metal gate (sensor I) showed about three times higher transconductance than the one with the top metal gate (sensor II) when they were modulated by a reference gate electrode placed in a solution. Further, the sensitivity of sensor I was three times higher than sensor II...

Read More
  • Cover Image

Journal of Mathematical Physics : On the divine clockwork: The spe...

By: Richard Durran, Andrew Neate, Aubrey Truman, and Feng-Yu Wang

Description: The correspondence limit of the atomic elliptic state in three dimensions is discussed in terms of Nelson’s stochastic mechanics. In previous work we have shown that this approach leads to a limiting Nelson diffusion, and here we discuss in detail the invariant measure for this process and show that it is concentrated on the Kepler ellipse in the plane z = 0. We then show that the limiting Nelson diffusion generator has a spectral gap; thereby proving that i...

Read More
  • Cover Image

Biblioteca Hispanica : Programme of Natural History, Physiology an...

By: Luis Perez Minguez
Read More
  • Cover Image

Applied Physics Letters : Probing antiphase boundaries in Fe3O4 th...

By: Shailja Tiwari, D. M. Phase, and R. J. Choudhary

Description: We present Raman study of Fe3O4 films of different thicknesses grown on single crystal Si and MgO substrates to investigate the presence of antiphase boundaries (APBs). X-ray diffraction and x-ray photoelectron spectroscopy measurements indicate that films are single phase Fe3O4 on both the substrates. The changes in frequency and linewidth of different Raman modes [A1g and T2g(3)] are monitored and the electron-phonon coupling parameter (λ) is computed. λ i...

Read More
  • Cover Image

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.

Read More
  • Cover Image

The Journal of Chemical Physics : Precision shooting: Sampling lon...

By: Michael Grünwald, Christoph Dellago, and Phillip L. Geissler

Description: The kinetics of collective rearrangements in solution, such as protein folding and nanocrystal phase transitions, often involve free energy barriers that are both long and rough. Applying methods of transition path sampling to harvest simulated trajectories that exemplify such processes is typically made difficult by a very low acceptance rate for newly generated trajectories. We address this problem by introducing a new generation algorithm based on the lin...

Read More
  • Cover Image

Biblioteca Hispanica : Compendium of Natural History

By: Benito Garcia De Los Santos
Read More
  • Cover Image

Chaos : Enstrophy amplification events in three-dimensional turbulence

By: Jörg Schumacher, Maik Boltes, Herwig Zilken, Marc-André Hermanns, Bruno Eckhardt et al

Description:

Read More
  • Cover Image

Review of Scientific Instruments : Cryogenic current-in-plane tunn...

By: Nicolas Weiss, Ute Drechsler, Michel Despont, and Stuart S. Parkin

Description: We have designed and fabricated a cryogenic variable-temperature current-in-plane tunneling apparatus to measure the magnetoresistive properties of unpatterned magnetic tunnel junction wafers as a function of temperature. The wafer is mounted on the cold finger of a liquid helium continuous flow cryostat. The temperature can be continuously varied between 7 and 330 K. We describe the design and fabrication of the micromachined silicon probe head that compris...

Read More
  • Cover Image

Applied Physics Letters : Conformable coating of SiO2 on hydrother...

By: B. H. Chu, L. C. Leu, C. Y. Chang, F. Lugo, D. Norton et al

Description: Coating silicon dioxide on hydrothermally grown ZnO nanorods is demonstrated using a low temperature plasma enhanced chemical vapor deposition (PECVD) system.Wurtzite structured ZnO nanorods were prepared by spin coating ZnO nanocrystals onto plastics or glass substrates. Then, the nanorods were subsequently grown in a zinc nitrate solution. SiO2 was deposited by PECVD at 50 °C. No current could be measured through the patterned metal dots on the SiO2 coated...

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



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