66,310 research outputs found
Carrier extraction circuit
Feedback loop extracts demodulated reference signals from IF input and feeds signal back to demodulator. Since reference signal is extracted directly from carrier, no separate reference need be transmitted. Circuit obtains coherent carrier from balanced or unbalanced four-phase signal of varying characteristics
Lunar landing flight research vehicle Patent
Lunar landing flight research vehicl
Hole polaron formation and migration in olivine phosphate materials
By combining first principles calculations and experimental XPS measurements,
we investigate the electronic structure of potential Li-ion battery cathode
materials LiMPO4 (M=Mn,Fe,Co,Ni) to uncover the underlying mechanisms that
determine small hole polaron formation and migration. We show that small hole
polaron formation depends on features in the electronic structure near the
valence-band maximum and that, calculationally, these features depend on the
methodology chosen for dealing with the correlated nature of the
transition-metal d-derived states in these systems. Comparison with experiment
reveals that a hybrid functional approach is superior to GGA+U in correctly
reproducing the XPS spectra. Using this approach we find that LiNiPO4 cannot
support small hole polarons, but that the other three compounds can. The
migration barrier is determined mainly by the strong or weak bonding nature of
the states at the top of the valence band, resulting in a substantially higher
barrier for LiMnPO4 than for LiCoPO4 or LiFePO4
Calculation of ionization equilibria for oxygen, neon, silicon, and iron
Ionization equilibria for iron, neon, oxygen, and silico
A PULL FACTOR ANALYSIS OF TRENDS IN FOOD AND BEVERAGE RETAIL SALES IN MISSISSIPPI COUNTIES
Agribusiness,
AN ASSESSMENT OF THE IMPACT OF THE RURAL EMPOWERMENT ZONE AND ENTERPRISE COMMUNITY PROGRAM ON TEXAS' RIO GRANDE VALLEY
A Human Development Index (HDI) was developed to analyze the impact of the rural empowerment zone program on counties in the Texas Rio Grande Valley. Results of the analysis indicate that minimal development has taken place in these counties. This outcome is attributable to several institutional factors.Community/Rural/Urban Development,
SOURCES OF CHANGE IN STATE-LEVEL AGRICULTURAL PRODUCTION IN MEXICO: IMPLICATIONS FROM THE PESO CRISIS OF 1994-1995
Production Economics,
A TDM synchronization system for multiple access satellite communication
Time Division Multiple Access /TDMA/ system for satellite communication with ground station syste
Comment on ``Bethe Ansatz Results for the 4f-Electron Spectra of a Degenerate Anderson Model ''
In a recent letter, Zvyagin calculates the density of states for 4f electrons
coupled to a conduction band in the framework of the Bethe ansatz (BA) solution
for the degenerate Anderson model. It is claimed that the results qualitatively
disagree with the results obtained for the same model but using a variational
approach. Even the high energy feature in the f-spectral function near the
4f-level energy ef, i.e. the ``normal'' ionization peak (NIP), is argued to be
qualitatively different in the two approaches. In the following we point out
that this is not the case.Comment: 1 page, RevTeX, no figur
Diffusion of solar cosmic rays and the power spectrum of the interplanetary magnetic field
Solar cosmic ray diffusion and interplanetary magnetic field power spectru
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