397 research outputs found
Precise time technology for selected Air Force systems: Present status and future requirements
Precise time and time interval (PTTI) technology is becoming increasingly significant to Air Force operations as digital techniques find expanded utility in military missions. Timing has a key role in the function as well as in navigation. A survey of the PTTI needs of several Air Force systems is presented. Current technology supporting these needs was reviewed and new requirements are emphasized for systems as they transfer from initial development to final operational deployment
Practicing Engagement
For this project I lead two rehearsal processes with peers, and a movement class for middle schoolers, all of which centered around engagement. I have investigated how my own and others’ engagement can contribute to a rich experience for participants and observers, using collaborative games and storytelling as a means of working with these ideas. I believe in the power of questioning together, as opposed to determining alone. Throughout these processes, we, the participants, have learned from each other and have had to re-negotiate our roles and responsibilities to the work as well as to each other.
Dancing with people is my motivation for making, and through collaborative processes we have been able to create spaces filled with connection, engagement, and care for each other. I find dances in which the participants have a real connection to each other exciting to watch as well as participate in, and I attempt to include the audience in this way. I want the audience to be invested in what is happening on stage because they are seeing genuine relationships; performer to movement, and performer to performer
On the crystallography of a higher boride of aluminum; The crystal structure of hexagonal potassium 12-tungstocobaltiate; An absorption correction for the Buerger precession camera
Thesis (Ph.D.)--Boston UniversityThe crystal structure of an aluminum boride with a high boron content, "AlphaA1B12", has been investigated. X-ray diffraction photographs of levels zero to seven were obtained using Weissenberg equi-inclination techniques on a crystal rotating about the b-axis. The tetragonal unit cell axes are a = b = 10.17 A. and c = 14.28 A. The space group is P 4 12 12 or its enantiomorph P 4 32 12. The number of formula units per unit cell, calculated using the experimental density of 2.55 g./cc., is 14.4.[TRUNCATED
Nuclear Magnetic Resonance Quantum Computing Using Liquid Crystal Solvents
Liquid crystals offer several advantages as solvents for molecules used for
nuclear magnetic resonance quantum computing (NMRQC). The dipolar coupling
between nuclear spins manifest in the NMR spectra of molecules oriented by a
liquid crystal permits a significant increase in clock frequency, while short
spin-lattice relaxation times permit fast recycling of algorithms, and save
time in calibration and signal-enhancement experiments. Furthermore, the use of
liquid crystal solvents offers scalability in the form of an expanded library
of spin-bearing molecules suitable for NMRQC. These ideas are demonstrated with
the successful execution of a 2-qubit Grover search using a molecule
(CHCl) oriented in a liquid crystal and a clock speed eight
times greater than in an isotropic solvent. Perhaps more importantly, five
times as many logic operations can be executed within the coherence time using
the liquid crystal solvent.Comment: Minor changes. Published in Appl. Phys. Lett. v.75, no.22, 29 Nov
1999, p.3563-356
Implementation of a three-quantum-bit search algorithm
We report the experimental implementation of Grover's quantum search
algorithm on a quantum computer with three quantum bits. The computer consists
of molecules of C-labeled CHFBr, in which the three weakly coupled
spin-1/2 nuclei behave as the bits and are initialized, manipulated, and read
out using magnetic resonance techniques. This quantum computation is made
possible by the introduction of two techniques which significantly reduce the
complexity of the experiment and by the surprising degree of cancellation of
systematic errors which have previously limited the total possible number of
quantum gates.Comment: Published in Applied Physics Letters, vol. 76, no. 5, 31 January
2000, p.646-648, after minor revisions. (revtex, mypsfig2.sty, 3 figures
Implementation of Conditional Phase Shift gate for Quantum Information Processing by NMR, using Transition-selective pulses
Experimental realization of quantum information processing in the field of
nuclear magnetic resonance (NMR) has been well established. Implementation of
conditional phase shift gate has been a significant step, which has lead to
realization of important algorithms such as Grover's search algorithm and
quantum Fourier transform. This gate has so far been implemented in NMR by
using coupling evolution method. We demonstrate here the implementation of the
conditional phase shift gate using transition selective pulses. As an
application of the gate, we demonstrate Grover's search algorithm and quantum
Fourier transform by simulations and experiments using transition selective
pulses.Comment: 14 pages, 5 figure
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