Physics Commons^™

"Blinded By The Lines: Mid-Ir Spectra Of Mira Variables Taken With Spitzer", Dana Baylis-Aguirre, Michelle J. Creech-Eakman, Donald G. Luttermoser, Tina Gueth

Donald G. Luttermoser

We present preliminary analysis of mid-infrared spectra of M-type and C-type Mira variables. Due to the brightness of this sample, it is straightforward to monitor changes with phase in the infrared spectral features of these regular pulsators. We have spectra of 25 Mira variables, taken with phase, using the Spitzer Infrared Spectrograph (IRS) high-resolution module. Each star has multiple spectra obtained over a one-year period from 2008-09. This is a rich, unique data set due to multiple observations of each star and the high signal-to-noise ratio from quick exposure times to prevent saturation of the IRS instrument. This paper focuses …

New Flexible Channels For Room Temperature Tunneling Field Effect Transistors, Boyi Hao, Anjana Asthana, Paniz Khanmohammadi, Paul Bergstrom, Douglas R. Banyai, Madhusudan A. Savaikar, John A. Jaszczak, Yoke Khin Yap

Paul Bergstrom

Tunneling field effect transistors (TFETs) have been proposed to overcome the fundamental issues of Si based transistors, such as short channel effect, finite leakage current, and high contact resistance. Unfortunately, most if not all TFETs are operational only at cryogenic temperatures. Here we report that iron (Fe) quantum dots functionalized boron nitride nanotubes (QDs-BNNTs) can be used as the flexible tunneling channels of TFETs at room temperatures. The electrical insulating BNNTs are used as the one-dimensional (1D) substrates to confine the uniform formation of Fe QDs on their surface as the flexible tunneling channel. Consistent semiconductor-like transport behaviors under various …

Simulation Of Charge Transport In Multi-Island Tunneling Devices: Application To Disordered One-Dimensional Systems At Low And High Biases, Madhusudan A. Savaikar, Douglas R. Banyai, Paul Bergstrom, John A. Jaszczak

Paul Bergstrom

Although devices have been fabricated displaying interesting single-electron transport characteristics, there has been limited progress in the development of tools that can simulate such devices based on their physical geometry over a range of bias conditions up to a few volts per junction. In this work, we present the development of a multi-island transport simulator, MITS, a simulator of tunneling transport in multi-island devices that takes into account geometrical and material parameters, and can span low and high source-drain biases. First, the capabilities of MITS are demonstrated by modeling experimentaldevices described in the literature, and showing that the simulated device …

Highly Directional Receiver And Source Antennas Using Photonic Band Gap Crystals, Rana Biswas, Gary L. Tuttle, Ekmel Ozbay, Burak Temelkuran, Mihail Sigalas, Kai-Ming Ho

Gary Tuttle

A directional antenna made with photonic band gap structures has been presented. The directional antenna is formed with two photonic band gap structures oriented back to back and separated from each other by a distance to form a resonant cavity between the photonic band gap structures. An antenna element is placed in the resonant cavity. The resonant frequency of the cavity is tuned by adjusting the distance between the photonic band gap structures. The resonant cavity can be asymmetrical or symmetrical.

A New Method For Measuring The Neutron Lifetime Using An In Situ Neutron Detector, Christopher L. Morris, Edith R. Adamek, Leah J. Broussard, Nathan B. Callahan, Stephen M. Clayton, Chris Cude-Woods, Scott A. Currie, Xiaoping Ding, Walter Fox, Kevin P. Hickerson, Mark A. Hoffbauer, Anthony T. Holley, A. Komives, Chen Y. Liu, Mark Makela, Robert W. Pattie, John C. Ramsey, Daniel J. Salvat, Alexander Saunders, Susan J. Seestrom, E. I. Sharapov, S. K. Sjue, Zhijing Tang, J. Vanderwerp, R. Bruce Vogelaar, Peter L. Walstrom, Zhehui Wang, Wanchun Wei, Judith W. Wexler, Tanner L. Womack, Andrew R. Young, B. A. Zeck

Robert W. Pattie Jr.

Detection System For Neutron Β Decay Correlations In The Ucnb And Nab Experiments, Leah J. Broussard, B. A. Zeck, Edith R. Adamek, Stephan Baeßler, Noah Birge, Marie Blatnik, J. David Bowman, Astrid E. Brandt, A. E. Brandt, Matthew Brown, John F. Burkhart, Nathan B. Callahan, Steven M. Clayton, Christopher B. Crawford, Chris Cude-Woods, Scott Currie, Eric B. Dees, Xinjian Ding, Nadia Fomin, Emil Frlez, Jason Fry, Frederick E. Gray, Said Hasan, Kevin P. Hickerson, J. Todd Hoagland, Anthony T. Holley, Takeyasu M. Ito, Andreas Klein, Hengne Li, Chenyu Liu, Mark F. Makela, P. L. Mcgaughey, J. Mirabal-Martinez, Charles L. Morris, Jose D. Ortiz, Robert W. Pattie Jr., Seppo I. Penttilä, Brad Plaster, Dinko Počanić, John C. Ramsey, A. Salas-Bacci, Daniel J. Salvat, Alexander Saunders, Susan J. Seestrom, Sky Sjue, Aron Sprow, Z. Tang, R. Bruce Vogelaar, Brittany Vorndick, Z. Wang, Wanchun Wei, J. Wexler, W. S. Wilburn, T. L. Womack, A. R. Young

Robert W. Pattie Jr.

Progress Towards Terahertz Acoustic Phonon Generation In Doping Superlattices, Thomas E. Wilson

Thomas E. Wilson

Progress is described in experiments to generate coherent terahertz acoustic phonons in silicon doping superlattices by the resonant absorption of nanosecond-pulsed far-infrared laser radiation. Future experiments are proposed that would use the superlattice as a transducer in a terahertz cryogenic acoustic reflection microscope with sub-nanometer resolution.

Using Raman Spectroscopy To Improve Hyperpolarized Noble Gas Production For Clinical Lung Imaging Techniques, Jonathan R. Birchall, Nicholas Whiting, Jason G. Skinner, Michael J. Barlow, Boyd M. Goodson

Nicholas Whiting