Rica, Sergio, Roberts, David C.
We model the behavior of N classical impurity fields immersed in a larger Bose-Einstein condensate by N+1 coupled nonlinear Schrodinger equations in 1, 2, and 3 space dimensions. We discuss the...
Mapping the evolution of scientific fields (2009)
Herrera, Mark, Roberts, David C., Gulbahce, Natali
Despite the apparent cross-disciplinary interactions among scientific fields, a formal description of their evolution is lacking. Here we describe a novel approach to study the dynamics and evolution...
Sykes, Andrew G., Davis, Matthew J., Roberts, David C.
The existence of frictionless flow below a critical velocity for obstacles moving in a superfluid is well established in the context of the mean-field Gross-Pitaevskii theory. We calculate the next...
Impurity crystal in a Bose-Einstein condensate (2008)
Roberts, David C., Rica, Sergio
We investigate the behavior of impurity fields immersed in a larger condensate field in 1, 2, and 3 dimensions. We discuss the localization of a single impurity field within a condensate and note the...
Causal Chunking: Memory and Inference in Ongoing Interaction (2008)
William B. Swann, Brett W. Pelham, David C. Roberts
We propose that people simplify their perceptions of their interactions by organizing them into discrete causal chunks. Once formed, these chunks presumably influence the extent to which people are...
Roberts, David C., Teodorescu, Razvan
Using a recently introduced linear reformulation of the Kuramoto model of self-synchronizing oscillator systems (arXiv:0704.1166), we study a new class of analytically solvable oscillator systems...
Casimir Friction I: Friction of a vacuum on a spinning dielectric (2007)
Pomeau, Yves, Roberts, David C.
We introduce the concept of Casimir friction, i.e. friction due to quantum fluctuations. In this first article we describe the calculation of a constant torque, arising from the scattering of quantum...
A linear reformulation of the Kuramoto model of self-synchronizing oscillators (2007)
The present paper introduces a linear reformulation of the Kuramoto model describing a self-synchronizing phase transition in a system of globally coupled oscillators that in general have different...
On the Hydrodynamic Boundary Condition for Superfluid Flow (2007)
Pomeau, Yves, Roberts, David C.
We discuss the hydrodynamic boundary condition for a superfluid moving tangentially to a rough surface. Specifically, we argue that the scattering of quantum fluctuations off surface roughness...
Stability analysis for $n$-component Bose-Einstein condensate (2006)
Roberts, David C., Ueda, Masahito
We derive the dynamic and thermodynamic stability conditions for dilute multicomponent Bose-Einstein condensates (BECs). These stability conditions, generalized for $n$-component BECs, are found to...
Lowe, Thomas C., Roberts, David C.
The report is concerned with the implementation of an on-line information storage and retrieval system for the Rome Air Development Center. This system is to incorporate techniques of automatic...
Lowe, Thomas C., Roberts, David C.
The report is concerned with the development of an on-line information storage and retrieval system for the Rome Air Development Center. It is deeply concerned with automatic document classification,...
Additional Text Processing for On-Line Retrieval (The RADCOL System). Volume 1. (2005)
Lowe,Thomas C., Roberts,David C., Kurtz,Peter
RADCOL is an information storage and retrieval system being developed for the Rome Air Development Center. The system automatically classifies tens of thousands of documents, according to their...
Roberts, David C. (David Christopher)
Thesis (Ph. D.)--Massachusetts Institute of Technology, Dept. of Mechanical Engineering, 2002.
A high-frequency, high-stiffness piezoelectric actuator for microhydraulic applications (2002)
Roberts, David C., Li, Hanqing, Steyn, J. Lodewyk, Turner, Kevin T., Mlcak, Richard, Saggere, Laxminarayana, ...
A piezoelectric actuator capable of high-frequency, high-stiffness actuation in previous termmicrohydraulicnext term systems was fabricated and experimentally characterized to frequencies in excess...
Roberts, David C. (David Christopher)
Thesis (Ph. D.)--Massachusetts Institute of Technology, Dept. of Mechanical Engineering, 2002.
Roberts, David C. (David Christopher)
A piezoelectrically-driven hydraulic amplification microvalve for use in high specific power hydraulic pumping applications was designed, fabricated, and experimentally characterized. High frequency,...
SELF-REPAIR THEORY INVESTIGATION. (1998)
Veitch,Edward W., Roberts,David C.
This is the sixth report from a study to develop a theory of self-repair in digital nets via fault diagnosis and automatic circuit replacement using the Sequential Prime Implicant Form for net...
SELF-REPAIR THEORY INVESTIGATION. (1998)
Veitch,Edward W., Roberts,David C.
This is the seventh report from a study to develop a theory of self-repair in digital nets via fault diagnosis and automatic circuit replacement using the Sequential Prime Implicant Form for net...
Roberts, David C. (David Christopher)
Thesis (M.S.)--Massachusetts Institute of Technology, Dept. of Mechanical Engineering, 1998.
Integrating Structured Data and Text: A Relational Approach (1997)
David A. Grossman, Ophir Frieder, David O. Holmes, David C. Roberts
We integrate structured data and text using the unchanged, standard relational model. We started with the premise that a relational system could be used to implement an Information Retrieval (IR)...
Integrating Structured Data and Text: A relational approach (1997)
David A. Grossman, David O. Holmes, Ophir Frieder, David C. Roberts
Weintegrate structured data and text using the unchanged, standard relational model. We started with the premise that a relational system could be used to implement an Information Retrieval #IR#...
Integrating Structured Data and Text: A Relational Approach (1997)
David A. Grossman, Ophir Frieder, David O. Holmes, David C. Roberts
We integrate structured data and text using the unchanged, standard relational model. We started with the premise that a relational system could be used to implement an Information Retrieval (IR)...
Roberts, David C. (David Christopher)
Thesis (B.S.)--Massachusetts Institute of Technology, Dept. of Mechanical Engineering, 1995.
Wilderness Trail Bikes B.V. : business plan for European distribution center / (1995)
Buckerg, Nicole S., Fischer, William Brooke., Katsuyoshi, Diane Y., Pohlhaus, John., Roberts, David C.
Thesis (MBA)--Monterey Institute of International Studies, 1995.
Thesis (M.S.)--Ohio State University.
Roberts, David C., Tattersall, Ian.
9 p. : ill. ; 24 cm.
Preferences for environmental quality under uncertainty
Roberts, David C., Boyer, Tracy A., Lusk, Jayson L.
Although the expected effects of environmental policies and interventions are rarely known with certainty, stated preference surveys rarely elicit preferences over uncertain environmental outcomes....
The Value of Regional Annual Nitrogen Needs Information for Wheat Producers in Oklahoma
Roberts, David C., Brorsen, B. Wade, Raun, William R., Solie, John B.
Crop producers are increasingly interested in reducing nitrogen use without sacrificing yield. Technology is available for precise application at the sub-field level, but adoption has been sluggish....
A Spatial Assessment of Possible Water Quality Trading Markets in Tennessee
David C. Roberts, Christopher D. Clark, William M. Park, Burton C. English
Trading in water pollution reduction credits, or "water quality trading," (WQT) has been touted as a cost-effective solution to water quality impairments caused by nutrients and other...
Using Expression and Genotype to Predict Drug Response in Yeast
Ruderfer, Douglas M., Roberts, David C., Schreiber, Stuart L., Perlstein, Ethan O., Kruglyak, Leonid
Personalized, or genomic, medicine entails tailoring pharmacological therapies according to individual genetic variation at genomic loci encoding proteins in drug-response pathways. It has been...