Search Results - "Sheehan, D P"

Protoplanetary Disk Properties in the Orion Nebula Cluster: Initial Results from Deep, High-resolution ALMA Observations by Eisner, J. A., Arce, H. G., Ballering, N. P., Bally, J., Andrews, S. M., Boyden, R. D., Francesco, J. Di, Fang, M., Johnstone, D., Kim, J. S., Mann, R. K., Matthews, B., Pascucci, I., Ricci, L., Sheehan, P. D., Williams, J. P.

“…We present Atacama Large Millimeter Array 850 m continuum observations of the Orion Nebula Cluster that provide the highest angular resolution (∼0 1 40 au) and…”
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New Spatially Resolved Imaging of the SR 21 Transition Disk and Constraints on the Small-grain Disk Geometry by Sallum, S., Skemer, A. J., Eisner, J. A., van der Marel, N., Sheehan, P. D., Close, L. M., Ireland, M. J., Males, J. M., Morzinski, K. M., Bailey, V. P., Briguglio, R., Puglisi, A.

“…We present new 0.6-4 m imaging of the SR 21 transition disk from Keck/NIRC2 and Magellan/MagAO. The protoplanetary disk around SR 21 has a large (∼30-40 au)…”
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PROTOPLANETARY DISKS IN THE ORION OMC1 REGION IMAGED WITH ALMA by Eisner, J. A., Bally, J. M., Ginsburg, A., Sheehan, P. D.

“…ABSTRACT We present ALMA observations of the Orion Nebula that cover the OMC1 outflow region. Our focus in this paper is on compact emission from…”
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Positively charged dust crystals induced by radiative heating by Rosenberg, M., Mendis, D.A., Sheehan, D.P.

“…In this paper, we consider theoretically conditions for forming crystals of positively charged dust, when the dust is heated by a laser or by a strong infrared…”
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A Self-Charging Concentration Cell: Theory by Sheehan, D.P.

“…Batteries are a key resource in the quest for sustainable energy. Here, the theoretical basis is presented for a new type of electrochemical concentration cell…”
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Improved Constraints on the Disk around MWC 349A from the 23 m LBTI by Sallum, S., Eisner, J. A., Hinz, P. M., Sheehan, P. D., Skemer, A. J., Tuthill, P. G., Young, J. S.

“…We present new spatially resolved observations of MWC 349A from the Large Binocular Telescope Interferometer (LBTI), a 23 m baseline interferometer made up of…”
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Use of Dusty Plasmas for Surface-Enhanced Vibrational Spectroscopy Studies by Rosenberg, M, Sheehan, D. P, Petrie, J. R

“…Dusty plasmas are low-temperature, weakly ionized gases containing micron- to submicron-sized solid particles that are charged by plasma collection currents…”
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A note on the use of dust plasma crystals as FIR/submillimeter filters by Rosenberg, M., Sheehan, D.P.

“…The use of dust plasma crystals as filters of electromagnetic waves in the far-infrared or submillimeter wavelength regime is investigated theoretically. The…”
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Intrinsically biased, resonant NEMS–MEMS oscillator and the second law of thermodynamics by Sheehan, D.P., Wright, J.H., Putnam, A.R., Perttu, E.K.

“…An experimentally testable NEMS–MEMS resonant cantilever oscillator is examined theoretically for compliance with the second law of thermodynamics. The device…”
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UV-induced Coulomb crystallization of dust grains in high-pressure gas by Rosenberg, M., Mendis, D.A., Sheehan, D.P.

“…A scheme for forming a Coulomb lattice of positively charged dust grains in a high-pressure (P>torr) gas is discussed theoretically. The grains are charged…”
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Steady-state nonequilibrium temperature gradients in hydrogen gas-metal systems: challenging the second law of thermodynamics by Sheehan, D P, Garamella, J T, Mallin, D J, Sheehan, W F

“…Differences in gas reaction rates between disparate surfaces have been proposed as a means to achieve steady-state pressure and temperature gradients within a…”
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Nonequilibrium heterogeneous catalysis in the long mean-free-path regime by Sheehan, D P

“…It is shown that a standard principle of traditional catalysis-that a catalyst does not alter the final thermodynamic equilibrium of a reaction-can fail in…”
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Orthogonally-oriented nanotube arrays: theory by Sheehan, D P

“…A novel surface involving ordered arrays of partially-embedded carbon nanotubes is developed theoretically. Analysis indicates it should exhibit ultra-low…”
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On the Persistence of Small Regions of Vorticity in the Protoplanetary Nebula by Davis, S. S, Sheehan, D. P, Cuzzi, J. N

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Modeling a submicrometer electrostatic motor by Wright, J H, Sheehan, D P, Putnam, A R

“…Numerical models are developed for a recently proposed submicrometer device that uses the electric field energy of a biased parallel-plate semiconducting…”
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Gravitationally-Induced, Dynamically-Maintained, Steady-State Pressure Gradients by Sheehan, D P, Glick, J

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Phase Space Analysis of a Gravitationally-Induced, Steady-State Nonequilibrium by Sheehan, D P, Glick, J, Duncan, T, Langton, J A, Gagliardi, M, Tobe, R

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Orthogonally-oriented nanotube arrays: experiment I by Sheehan, D P, Webster, J T, Baird, L M

“…Recently a new type of self-assembling surface has been proposed that, in theory, possesses a number of desirable tribological, electrical, and thermal…”
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IRAS4A1: Multi-wavelength continuum analysis of a very flared Class 0 disk by Guerra-Alvarado, O. M, van der Marel, N, Di Francesco, J, Looney, L. W, Tobin, J. J, Cox, E. G, Sheehan, P. D, Wilner, D. J, Macías, E, Carrasco-González, C

“…A&A 681, A82 (2024) Understanding the formation of substructures in protoplanetary disks is vital for gaining insights into dust growth and the process of…”
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The second law and chemically-induced, steady-state pressure gradients: controversy, corroboration and caveats by Sheehan, D.P.

“…Experimental results are reported supporting key aspects of a recently proposed chemical pressure gradient (D.P. Sheehan, Phys. Rev. E 57 (1998) 6660). This…”
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