142 research outputs found
Exploring the Role that Forecast Surprise and Forecast Error Play in Determining Management Forecast Precision
Implications of Comprehensive Income Disclosure for Future Earning and Analysts' Forecasts
This paper examines the association of comprehensive income with
subsequent period net income as well as analysts earnings forecasts.
Our results support the notion that comprehensive income is
incrementally useful in predicting subsequent period changes in net
income. We also document that comprehensive income is associated
with analysts earnings forecast revisions and forecast errors. The
evidence is consistent with analysts failure to fully utilize the
information disclosed in comprehensive income. The result suggests
that analysts revise their year t+1s forecast downward when
comprehensive income is smaller than net income but they do not revise
the forecast upward when comprehensive income is greater than net
income. This evidence on the asymmetric use of comprehensive income
is consistent with the notion that the future recognition of unrecognized losses is more predictable than the future recognition of unrecognized
gains
Robust nanostructures with exceptionally high electrochemical reaction activity for high temperature fuel cell electrodes
Metal nanoparticles are of significant importance for chemical and electrochemical transformations due to their high surface-to-volume ratio and possible unique catalytic properties. However, the poor thermal stability of nano-sized particles typically limits their use to low temperature conditions (<500 Ā°C). Furthermore, for electrocatalytic applications they must be placed in simultaneous contact with percolating ionic and electronic current transport pathways. These factors have limited the application of nanoscale metal catalysts (diameter <5 nm) in solid oxide fuel cell (SOFC) electrodes. Here we overcome these challenges of thermal stability and microstructural design by stabilizing metal nanoparticles on a scaffold of Sm_(0.2)Ce_(0.8)O_(2āĪ“) (SDC) films with highly porous and vertically-oriented morphology, where the oxide serves as a support, as a mixed conducting transport layer for fuel electro-oxidation reactions, and as an inherently active partner in catalysis. The SDC films are grown on single crystal YSZ electrolyte substrates by means of pulsed-laser deposition, and the metals (11 Ī¼g cm^(ā2) of Pt, Ni, Co, or Pd) are subsequently applied by D.C. sputtering. The resulting structures are examined by TEM, SIMS, and electron diffraction, and metal nanoparticles are found to be stabilized on the porous SDC structure even after exposure to 650 Ā°C under humidified H_2 for 100 h. A.C. impedance spectroscopy of the metal-decorated porous SDC films reveals exceptionally high electrochemical reaction activity toward hydrogen electro-oxidation, as well as, in the particular case of Pt, coking resistance when CH_4 is supplied as the fuel. The implications of these results for scalable and high performance thin-film-based SOFCs at reduced operating temperature are discussed
Topological acoustic triple point
Acoustic phonon in a crystalline solid is a well-known and ubiquitous example
of elementary excitation with a triple degeneracy in the band structure.
Because of the Nambu-Goldstone theorem, this triple degeneracy is always
present in the phonon band structure. Here, we show that the triple degeneracy
of acoustic phonons can be characterized by a topological charge
that is a property of three-band systems with symmetry, where
and are the inversion and the time-reversal
symmetries, respectively. We therefore call triple points with nontrivial
the topological acoustic triple point (TATP). The topological
charge can equivalently be characterized by the skyrmion number
of the longitudinal mode, or by the Euler number of the transverse modes, and
this strongly constrains the nodal structure around the TATP. The TATP can also
be symmetry-protected at high-symmetry momenta in the band structure of phonons
and spinless electrons by the and the groups. The nontrivial
wavefunction texture around the TATP can induce anomalous thermal transport in
phononic systems and orbital Hall effect in electronic systems. Our theory
demonstrates that the gapless points associated with the Nambu-Goldstone
theorem are an avenue for discovering new classes of degeneracy points with
distinct topological characteristics.Comment: 7+15 pages, 5+6 figure
Optimizing the Mixing Proportion with Neural Networks Based on Genetic Algorithms for Recycled Aggregate Concrete
This research aims to optimize the mixing proportion of recycled aggregate concrete (RAC) using neural networks (NNs) based on genetic algorithms (GAs) for increasing the use of recycled aggregate (RA). NN and GA were used to predict the compressive strength of the concrete at 28 days. And sensitivity analysis of the NN based on GA was used to find the mixing ratio of RAC. The mixing criteria for RAC were determined and the replacement ratio of RAs was identified. This research reveal that the proposed method, which is NN based on GA, is proper for optimizing appropriate mixing proportion of RAC. Also, this method would help the construction engineers to utilize the recycled aggregate and reduce the concrete waste in construction process
The Association between Audit Quality and Abnormal Audit Fees
Also presented at Korean Accounting Association Annual Conference 2006</p
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