241 research outputs found
TGF-β3 dependent modification of radiosensitivity in reporter cells exposed to serum from whole-body low dose-rate irradiated mice
The Exclusionary Rule: Fix It, But Fix It Right - A Critique of If It\u27s Broken, Fix It: Moving Beyond the Exclusionary Rule
Incoherent charge transport through molecular wires: interplay of Coulomb interaction and wire population
The influence of Coulomb interaction on the electron transport through
molecular wires is studied in the regime of incoherent tunneling. In the limit
of strong Coulomb repulsion, the current for spinless electrons is determined.
It is shown that the voltage profile along the wire crucially influences the
dependence of the current on the wire length. Upon inclusion of the spin degree
of freedom one finds a blocking effect which depends both on the interaction
strength and on the population of the wire. For finite Coulomb interaction, the
temperature dependence of the blocking is studied and it is shown that several
regimes with different blocking strength may exist.Comment: 18 pages, 8 figures, elsart.cls v2.18 include
Enhanced transmission through arrays of subwavelength holes in gold films coated by a finite dielectric layer
Enhanced transmissions through a gold film with arrays of subwavelength holes
are theoretically studied, employing the rigid full vectorial three dimensional
finite difference time domain method. Influence of air-holes shape to the
transmission is firstly studied, which confirms two different resonances
attributing to the enhanced transmission: the localized waveguide resonance and
periodic surface plasmon resonances. For the film coated with dielectric
layers, calculated results show that in the wavelength region of interest the
localized waveguide resonant mode attributes to sensing rather than the
periodic gold-glass surface plasmon mode. Although the detected peak is fairly
broad and the shift is not too pronounced, we emphasize the contribution for
sensing from the localized waveguide resonant mode, which may opens up new ways
to design surface plasmon based sensors.Comment: 11 pages including 4 figures. Accepted for JEOS:R
High Temperature Co-electrolysis of Steam and CO<sub>2</sub> in an SOC stack: Performance and Durability
Storing electricity and CO<sub>2</sub> as synthetic hydrocarbon fuels by high temperature electrolysis
Relation Between Ni Particle Shape Change and Ni Migration in Ni–YSZ Electrodes – a Hypothesis
Performance and durability of solid oxide electrolysis cells for syngas production
Performance and durability of Ni/YSZ based solid oxide electrolysis cells (SOECs) for co-electrolysis of H2O and CO2 at high current density were investigated. The cells consist of a Ni/YSZ support, a Ni/YSZ fuel electrode, a YSZ electrolyte, and a LSM-YSZ oxygen electrode. The cell durability was examined at 800°C and electrolysis current density of -1 or -1.5 A/cm2 with 60% reactant (H2O+CO2) utilization. The cell voltage degradation showed a strong dependence on the electrolysis current density, with an overall cell voltage degradation rate of 0.24 mV/h at -1 A/cm2 and of 0.82 mV/h at -1.5 A/cm2. Electrochemical characterization of the cells showed that the degradation was mainly related to the LSM/YSZ electrode when operated at -1 A/cm2, whereas at increased current density (-1.5 A/cm2), both the Ni/YSZ and LSM/YSZ electrodes showed degradation.</jats:p
Wave packet propagation by the Faber polynomial approximation in electrodynamics of passive media
Maxwell's equations for propagation of electromagnetic waves in dispersive
and absorptive (passive) media are represented in the form of the Schr\"odinger
equation , where is a linear
differential operator (Hamiltonian) acting on a multi-dimensional vector
composed of the electromagnetic fields and auxiliary matter fields describing
the medium response. In this representation, the initial value problem is
solved by applying the fundamental solution to the initial field
configuration. The Faber polynomial approximation of the fundamental solution
is used to develop a numerical algorithm for propagation of broad band wave
packets in passive media. The action of the Hamiltonian on the wave function
is approximated by the Fourier grid pseudospectral method. The algorithm
is global in time, meaning that the entire propagation can be carried out in
just a few time steps. A typical time step is much larger than that in finite
differencing schemes, . The accuracy and stability
of the algorithm is analyzed. The Faber propagation method is compared with the
Lanczos-Arnoldi propagation method with an example of scattering of broad band
laser pulses on a periodic grating made of a dielectric whose dispersive
properties are described by the Rocard-Powels-Debye model. The Faber algorithm
is shown to be more efficient. The Courant limit for time stepping, , is exceeded at least in 3000 times in the Faber propagation
scheme.Comment: Latex, 17 pages, 4 figures (separate png files); to appear in J.
Comput. Phy
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