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Search Publications

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Displaying 16801 - 16825 of 74075

Performance Measurement of Mobile Manipulators

April 24, 2015
Author(s)
Roger V. Bostelman, Tsai Hong Hong, Jeremy A. Marvel
This paper describes a concept for measuring the reproducible performance of mobile manipulators to be used for assembly or other similar tasks. An AGV with an onboard robot arm was programmed to repeatedly move to and stop at a novel, reconfigurable

Analysis of a Half-Scale Composite Floor System Test under Column Loss Scenarios

April 23, 2015
Author(s)
Joseph A. Main, Jonathan M. Weigand, Eric S. Johnson, Tim Francicso, Judy Liu, Jeffrey W. Berman, Larry A. Fahnestock
This paper describes modeling and analysis of a half-scale steel gravity frame system with composite concrete slab on steel deck that was constructed and tested at the University of Illinois under corner, edge, and interior column removal scenarios. For

Introducing Combinatorial Testing in a Large Organization

April 23, 2015
Author(s)
Jon Hagar, Thomas Wissink, D. Richard Kuhn, Raghu N. Kacker
A two-year study of eight pilot projects to introduce combinatorial testing in a large aerospace corporation found that the new methods were practical, significantly lowered development costs, and improved test coverage by 20 to 50 percent.

Measuring collected gas with microwave and acoustic resonances

April 23, 2015
Author(s)
Keith A. Gillis, James W. Schmidt, Michael R. Moldover, James B. Mehl
With calibrations of large flow meters in mind, we established the feasibility of determining the mass M of argon gas contained within a 0.3 m 3 commercially manufactured pressure vessel ("tank") with a relative standard uncertainty of u r(M) = 0.0016 at 0

New Steel Gravity Connection Details for Enhanced Integrity

April 23, 2015
Author(s)
Jonathan M. Weigand, Jeffrey W. Berman
Recent large-scale tests have found that Steel Gravity Framing Systems (SGFSs) with conventional connections were inadequate to support the integrity gravity load combinations under column removal scenarios. To address this issue, detailed connection

Rapid PCR of STR Markers: Applications to Human Identification

April 23, 2015
Author(s)
Peter Vallone, Erica Romsos
Multiplex PCR with fluorescently labeled primers has been an essential method for the amplification of short tandem repeats used in human identify testing. Within the STR workflow of extraction, quantitation, amplification, separation, and detection

Community Resilience of the Built Environment

April 22, 2015
Author(s)
Therese P. McAllister
Buildings, facilities, and infrastructure systems play a key role in the life of a community by supporting housing, business, government, industry, and other vital services. The concept of disaster resilience addresses the way that communities prepare for

Electron Spin Resonance Scanning Probe Spectroscopy for Ultra-Sensitive Biochemical Studies

April 22, 2015
Author(s)
Jason P. Campbell, Jason T. Ryan, Pragya R. Shrestha, Zhanglong Liu, Canute I. Vaz, Jihong Kim, Vasileia Georgiou, Kin P. Cheung
Electron spin resonance (ESR) spectroscopy’s affinity for detecting paramagnetic free radicals, or spins, has been increasingly employed to examine a large variety of biochemical interactions. Such paramagnetic species are broadly found in nature and can

Overview of the TREC 2014 Clinical Decision Support Track

April 22, 2015
Author(s)
Ellen M. Voorhees
The Text REtrieval Conference (TREC) Clinical Decision Support Track fosters research on systems that link electronic health records with information that is relevant for patient care. TREC 2014 is the initial year of the track. The focus of the first year

Speed of sound measurements and a fundamental equation of state for cyclopentane

April 22, 2015
Author(s)
Eric W. Lemmon, Holger Gedanitz, Maria J. Davila
The speed of sound in liquid cyclopentane has been measured in the temperature range from (258 to 353) K at pressures up to 30 MPa (42 data points) using a pulse-echo method with a double path type sensor. The expanded overall uncertainty (k = 2) in the

Time Dependent Driving Forces and the Kinetics of Tricalcium Silicate Hydration

April 22, 2015
Author(s)
Jeffrey W. Bullard, George W. Scherer, Jeffrey J. Thomas
Simulations of tricalcium silicate (C3S) hydration using a kinetic cellular automaton program, HydratiCA, indicate that the net rate depends both on C3S dissolution and on hydration product growth. Neither process can be considered the sole rate

Nondestructive measurement of the evolution of layer-specific mechanical properties in sub-10nm bilayer films

April 21, 2015
Author(s)
Justin M. Shaw, Kathleen Hoogeboom-Pot, Jorge Hernandez-Charpak, Henry Kapteyn, Margaret Murnane, Damiano Nardi
ABSTRACT: We use short-wavelength extreme-ultraviolet light to independently measure the mechanical properties of disparate layers within a bilayer film with single-monolayer sensitivity. We show that in Ni/Ta nanostructured systems, while their densities

Perfluorinated Alkyl Acids in Wildlife

April 21, 2015
Author(s)
Jessica L. Reiner, Benjamin J. Place
The first measurements of perfluorinated compounds (PFCs) in wildlife from the aqueous and terrestrial environment showed their ubiquitous presence. Since the initial studies in 2001 their presence, distribution, and fate in the environment has broadly

Pore Collapse and Regrowth in Silicon Electrodes for Rechargeable Batteries

April 21, 2015
Author(s)
Steven C. DeCaluwe, Bal Mukund NMN Dhar, Liwei Huang, Yuping He, Kaikun Yang, Jon P. Owejan, Yiping Zhao, A. Alec Talin, Joseph Dura, Howard Wang
Structure and composition changes of an alumina capped amorphous silicon (a-Si) thin-film anode in a lithium half-cell are measured, in opernado, by neutron reflectivity (NR) and electrochemical impedance spectroscopy. The a-Si anode's thickness expands

Data Formats for Elementary Gas Phase Kinetics: Part 3. Reaction Classification

April 20, 2015
Author(s)
Donald R. Burgess Jr., Jeffrey A. Manion, Carrigan J. Hayes
A method denoted InChI ER has been developed to describe and identify elementary reactions in a standard computer-readable notation by extending the IUPAC International Chemical Identifier (InChI) formalism. Five additional hierarchical InChI ER layers

Interface-State Capture Cross Section — Why Does It Vary So Much?

April 20, 2015
Author(s)
Jason T. Ryan, Asahiko Matsuda, Jason P. Campbell, Kin P. Cheung
A capture cross section value is often assigned to Si-SiO2 interface defects. Using a kinetic variation of the charge pumping technique and transition state theory, we show that the value of capture cross section is extremely sensitive to the measurement

On the Stability of Rotating Drops

April 20, 2015
Author(s)
Asha K. Nurse, Sam R. Coriell, Geoffrey B. McFadden
We consider the equilibrium and stability of rotating axisymmetric fluid drops by appealing to a variational principle that characterizes the equilibria as stationary states of a functional containing surface energy and rotational energy contributions

On-Fiber Plasmonic Interferometer for Multi-Parameter Sensing

April 20, 2015
Author(s)
Zhijian Zhang, Yongyao Chen, Haijun H. Liu, Hyungdae Bae, Douglas A. Olson, Miao Yu
We demonstrate a novel miniature multi-parameter sensing device based on a plasmonic interferometer fabricated on a fiber facet in the optical communication wavelength range. This device enables the coupling between surface plasmon resonance and plasmonic

Optimization of collisional Feshbach cooling of an ultracold non degenerate gas

April 20, 2015
Author(s)
Marlon Nuske, L. Mathey, Eite Tiesinga
We optimize a collision-induced cooling process for ultracold atoms in the nondegenerate regime. It makes use of a Feshbach resonance, instead of rf radiation in evaporative cooling, to selectively expel hot atoms from a trap. Using functional minimization

The Nature of Record Efficiency Fluid-Processed Nanotube-Silicon Heterojunctions

April 20, 2015
Author(s)
Jeffrey A. Fagan, Erik K. Hobbie, John M. Harris, Matthew R. Semler
The dark transport characteristics of heterojunctions assembled from type, chirality and length-purified single-wall carbon nanotubes (SWCNTs) are used to clarify the nature of nanotube-silicon diodes and solar cells. The freestanding films show remarkable
Displaying 16801 - 16825 of 74075