55 research outputs found
The theophylline‐enoxacin interaction: I. Effect of enoxacin dose size on theophylline disposition
Peer Reviewedhttp://deepblue.lib.umich.edu/bitstream/2027.42/110004/1/cptclpt1988197.pd
Sub-megahertz homogeneous linewidth for Er in Si via in situ single photon detection
We studied the optical properties of a resonantly excited trivalent Er
ensemble in Si accessed via in situ single photon detection. A novel approach
which avoids nanofabrication on the sample is introduced, resulting in a highly
efficient detection of 70 excitation frequencies, of which 63 resonances have
not been observed in literature. The center frequencies and optical lifetimes
of all resonances have been extracted, showing that 5% of the resonances are
within 1 GHz of our electrically detected resonances and that the optical
lifetimes range from 0.5 ms up to 1.5 ms. We observed inhomogeneous broadening
of less than 400 MHz and an upper bound on the homogeneous linewidth of 1.4 MHz
and 0.75 MHz for two separate resonances, which is a reduction of more than an
order of magnitude observed to date. These narrow optical transition properties
show that Er in Si is an excellent candidate for future quantum information and
communication applications.Comment: 12 pages, 13 figure
Millisecond electron spin coherence time for erbium ions in silicon
Spins in silicon that are accessible via a telecom-compatible optical
transition are a versatile platform for quantum information processing that can
leverage the well-established silicon nanofabrication industry. Key to these
applications are long coherence times on the optical and spin transitions to
provide a robust system for interfacing photonic and spin qubits. Here, we
report telecom-compatible Er3+ sites with long optical and electron spin
coherence times, measured within a nuclear spin-free silicon crystal (<0.01%
29Si) using optical detection. We investigate two sites and find 0.1 GHz
optical inhomogeneous linewidths and homogeneous linewidths below 70 kHz for
both sites. We measure the electron spin coherence time of both sites using
optically detected magnetic resonance and observe Hahn echo decay constants of
0.8 ms and 1.2 ms at around 11 mT. These optical and spin properties of Er3+:Si
are an important milestone towards using optically accessible spins in silicon
for a broad range of quantum information processing applications.Comment: 14 pages, 6 figure
The theophylline‐enoxacin interaction: II. Changes in the disposition of theophylline and its metabolites during intermittent administration of enoxacin
Peer Reviewedhttp://deepblue.lib.umich.edu/bitstream/2027.42/109958/1/cptclpt1989160.pd
Atomic structure holography using thermal neutrons
The idea of atomic-resolution holography has its roots in the X-ray work of Bragg1 and in Gabor's electron interference microscope2. Gabor's lensless microscope was not realized in his time, but over the past twelve years there has been a steady increase in the number of reports on atomic-resolution holography. All of this work involves the use of electrons3, 4, 5, 6 or hard X-rays7, 8, 9, 10, 11 to produce the hologram. Neutrons are often unique among scattering probes in their interaction with materials: for example, the relative visibility of hydrogen and its isotopes is a great advantage in the study of polymers and biologically relevant materials. Recent work12 proposed that atomic-resolution holography could be achieved with thermal neutrons. Here we use monochromatic thermal neutrons, adopting the inside-source concept of Sz\ufffdke13, to image planes of oxygen atoms located above and below a single hydrogen atom in the oxide mineral simpsonite14.NRC publication: Ye
'A Divided Soul'? the Cold War odyssey of O. John Rogge
In 1948 O. John Rogge, a prominent American liberal, was a contender for the Progressive Party's vice-presidential nomination. He was then a man of the Left: an activist in the international peace movement, a champion of radical causes and a defender of organizations deemed subversive by the Department of Justice. In 1951 he persuaded his\ud
client to turn government witness in the Rosenberg espionage trial and was converted into 'Rogge the Rat' by his former allies. In tracing this transformation, this paper will argue that Rogge was neither a typical Cold War apostate nor a typical anti-Stalinist intellectual. Instead, his political trajectory was the outcome of a failed attempt to steer global politics away from Cold War dichotomies. The paper will therefore throw new light\ud
both on the movement to find a 'third way' between East and West, and on the phenomenon of non-communist Left activism during the early Cold War
Source Reconciliation of Atmospheric Gas-Phase and Particle-Phase Pollutants during a Severe Photochemical Smog Episode
Shell design and reaming technique affect deformation in mobile-bearing total hip arthroplasty acetabular components
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