462 research outputs found
Electrical Detection of Coherent Nuclear Spin Oscillations in Phosphorus-Doped Silicon Using Pulsed ENDOR
We demonstrate the electrical detection of pulsed X-band Electron Nuclear
Double Resonance (ENDOR) in phosphorus-doped silicon at 5\,K. A pulse sequence
analogous to Davies ENDOR in conventional electron spin resonance is used to
measure the nuclear spin transition frequencies of the P nuclear spins,
where the P electron spins are detected electrically via spin-dependent
transitions through Si/SiO interface states, thus not relying on a
polarization of the electron spin system. In addition, the electrical detection
of coherent nuclear spin oscillations is shown, demonstrating the feasibility
to electrically read out the spin states of possible nuclear spin qubits.Comment: 5 pages, 3 figure
Selecting and working with an engineering consultant to design animal waste management facilities (1994)
"New 6/94/3.5M.""Water Quality.""Focus area : nutrients and bacterial wastes.""Published by University Extension, University of Missouri-System.
Electrical detection of spin echoes for phosphorus donors in silicon
The electrical detection of spin echoes via echo tomography is used to
observe decoherence processes associated with the electrical readout of the
spin state of phosphorus donor electrons in silicon near a SiO interface.
Using the Carr-Purcell pulse sequence, an echo decay with a time constant of
is observed, in good agreement with theoretical modeling
of the interaction between donors and paramagnetic interface states. Electrical
spin echo tomography thus can be used to study the spin dynamics in realistic
spin qubit devices for quantum information processing.Comment: 14 pages, 3 figure
Detection of mechanical resonance of a single-electron transistor by direct current
We have suspended an Al based single-electron transistor whose island can
resonate freely between the source and drain leads forming the clamps. In
addition to the regular side gate, a bottom gate with a larger capacitance to
the SET island is placed underneath to increase the SET coupling to mechanical
motion. The device can be considered as a doubly clamped Al beam that can
transduce mechanical vibrations into variations of the SET current. Our
simulations based on the orthodox model, with the SET parameters estimated from
the experiment, reproduce the observed transport characteristics in detail.Comment: 4 pages, 3 figure
Odors from livestock operations : causes and possible cures (1999)
Complaints about livestock odors have increased as growth in the number of large livestock operations, especially swine operations, increases the concentration of animals in small geographical areas. Many of these large operations store manure for long periods under anaerobic conditions in open manure storages or lagoons. Migration of urban residents seeking the perceived benefits of country living, such as quiet solitude and clean air, has increased the population density surrounding many livestock operations.New 9/99/3M
Damping in high-frequency metallic nanomechanical resonators
We have studied damping in polycrystalline Al nanomechanical resonators by
measuring the temperature dependence of their resonance frequency and quality
factor over a temperature range of 0.1 - 4 K. Two regimes are clearly
distinguished with a crossover temperature of 1 K. Below 1 K we observe a
logarithmic temperature dependence of the frequency and linear dependence of
damping that cannot be explained by the existing standard models. We attribute
these phenomena to the effect of the two-level systems characterized by the
unexpectedly long (at least two orders of magnitude longer) relaxation times
and discuss possible microscopic models for such systems. We conclude that the
dynamics of the two-level systems is dominated by their interaction with
one-dimensional phonon modes of the resonators.Comment: 5 pages, 3 figure
Brucellosis
The Oklahoma Cooperative Extension Service periodically issues revisions to its publications. The most current edition is made available. For access to an earlier edition, if available for this title, please contact the Oklahoma State University Library Archives by email at [email protected] or by phone at 405-744-6311
Brucellosis: Buyers and sellers guide
The Oklahoma Cooperative Extension Service periodically issues revisions to its publications. The most current edition is made available. For access to an earlier edition, if available for this title, please contact the Oklahoma State University Library Archives by email at [email protected] or by phone at 405-744-6311
A study of turbofan-engine compressor noise suppression techniques
Nacelle design for turbofan engine compressor noise suppression on Douglas DC-8 aircraf
Lock-in detection for pulsed electrically detected magnetic resonance
We show that in pulsed electrically detected magnetic resonance (pEDMR)
signal modulation in combination with a lock-in detection scheme can reduce the
low-frequency noise level by one order of magnitude and in addition removes the
microwave-induced non-resonant background. This is exemplarily demonstrated for
spin-echo measurements in phosphorus-doped Silicon. The modulation of the
signal is achieved by cycling the phase of the projection pulse used in pEDMR
for the read-out of the spin state.Comment: 4 pages, 2 figure
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