76 research outputs found
Dominant aerosol processes during high-pollution episodes over Greater Tokyo
This paper studies two high-pollution episodes over Greater Tokyo: 9 and 10
December 1999, and 31 July and 1 August 2001. Results obtained with the
chemistry-transport model (CTM) Polair3D are compared to measurements of
inorganic PM2.5. To understand to which extent the aerosol processes modeled in
Polair3D impact simulated inorganic PM2.5, Polair3D is run with different
options in the aerosol module, e.g. with/without heterogeneous reactions. To
quantify the impact of processes outside the aerosol module, simulations are
also done with another CTM (CMAQ). In the winter episode, sulfate is mostly
impacted by condensation, coagulation, long-range transport, and deposition to
a lesser extent. In the summer episode, the effect of long-range transport
largely dominates. The impact of condensation/evaporation is dominant for
ammonium, nitrate and chloride in both episodes. However, the impact of the
thermodynamic equilibrium assumption is limited. The impact of heterogeneous
reactions is large for nitrate and ammonium, and taking heterogeneous reactions
into account appears to be crucial in predicting the peaks of nitrate and
ammonium. The impact of deposition is the same for all inorganic PM2.5. It is
small compared to the impact of other processes although it is not negligible.
The impact of nucleation is negligible in the summer episode, and small in the
winter episode. The impact of coagulation is larger in the winter episode than
in the summer episode, because the number of small particles is higher in the
winter episode as a consequence of nucleation.Comment: Journal of Geophysical Research D: Atmospheres (15/05/2007) in pres
Magic angle effects of the one-dimensional axis conductivity in quasi-one dimensional conductors
In quasi-one-dimensional conductors, the conductivity in both one-dimensional
axis and interchain direction shows peaks when magnetic field is tilted at the
magic angles in the plane perpendicular to the conducting chain. Although there
are several theoretical studies to explain the magic angle effect, no
satisfactory explanation, especially for the one-dimensional conductivity, has
been obtained. We present a new theory of the magic angle effect in the
one-dimensional conductivity by taking account of the momentum-dependence of
the Fermi velocity, which should be large in the systems close to a spin
density wave instability. The magic angle effect is explained in the
semiclassical equations of motion, but neither the large corrugation of the
Fermi surface due to long-range hoppings nor hot spots, where the relaxation
time is small, on the Fermi surface are required.Comment: 4 pages, 3 figure
Diode-type Gas Sensors Fabricated with a Titania Film on a Ti Plate and Pd-Pt Electrodes –Effects of Polymer Coating on the Hydrogen-sensing Properties–
H2 responses of a diode-type gas sensor fabricated with a TiO2 film prepared by anodization of a Ti plate and Pd-Pt electrodes (Pd-Pt/TiO2) and the effects of polymer coating on the Pd-Pt/TiO 2 sensor were investigated in this study. The H2 response of the Pd-Pt/TiO2 sensor in dry N2 was larger than that in dry air at 250°C, but the addition of moisture into the atmosphere reduced O2 concentration dependence of H2 response. The responses decreased drastically at lower temperature (50°C), but the responses in N2 were larger than those in air under both dry and wet conditions. The coating of polymer on the Pd-Pt/TiO2 sensor increased the H 2 responses in wet air and N2 and reduced O2 concentration dependence of H2 responses
Monte Carlo Evaluation of Internal Dose and Distribution Imaging Due to Insoluble Radioactive Cs-Bearing Particles of Water Deposited Inside Lungs via Pulmonary Inhalation Using PHITS Code Combined with Voxel Phantom Data
Evaluation of Spin-Triplet Superconductivity in Sr2RuO4
This review presents a summary and evaluations of the superconducting
properties of the layered ruthenate Sr2RuO4 as they are known in the autumn of
2011. This paper appends the main progress that has been made since the
preceding review by Mackenzie and Maeno was published in 2003. Here, special
focus is placed on the critical evaluation of the spin-triplet, odd-parity
pairing scenario applied to Sr2RuO4. After an introduction to superconductors
with possible odd-parity pairing, accumulated evidence for the pairing symmetry
of Sr2RuO4 is examined. Then, significant recent progress on the theoretical
approaches to the superconducting pairing by Coulomb repulsion is reviewed. A
section is devoted to some experimental properties of Sr2RuO4 that seem to defy
simple explanations in terms of currently available spin-triplet scenario. The
next section deals with some new developments using eutectic boundaries and
micro-crystals, which reveals novel superconducting phenomena related to chiral
edge states, odd-frequency pairing states, and half-fluxoid states. Some of
these properties are intimately connected with the properties as a topological
superconductor. The article concludes with a summary of knowledge emerged from
the study of Sr2RuO4 that are now more widely applied to understand the physics
of other unconventional superconductors, as well as with a brief discussion of
relatively unexplored but promising areas of ongoing and future studies of
Sr2RuO4.Comment: 31 pages, 35 figures, published in J. Phys. Soc. Jpn. as a review
article of Special Topic
Efeito da adição de microssĂlica na hidratação de Ăłxido de magnĂ©sio em concretos refratários
Long-range transport of particulate polycyclic aromatic hydrocarbons at Cape Hedo remote island site in the East China Sea between 2005 and 2008
Double Electron Capture Processes in Collisions of 3He2+ with N2, O2 and CO at 1 keV/amu
Fragmentation of N2 and Post Collision Effects in Slow Electron Capture Collisions of Kr8+ Ion Below 200 eV/amu
Simultaneous charge polarization and fragmentation of N<sub>2</sub> molecules in slow keV collisions with Kr<sup>8+</sup> ions
Coulomb fragmentation processes in collisions of Kr8+ ions with nitrogen molecules were studied at projectile energies between 19 and 171 eV/u. At low impact energies (less than or similar to50 eV/u) and small impact parameters, the electron distribution of the fragmenting molecular N-2(q+) ion becomes strongly polarized. This is due to the presence of the slow highly charged projectile during the fragmentation process. Microscopic calculations simultaneously incorporating electron transfer and molecular dissociation give insight into the dynamics of this newly found polarization effect
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