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Search Publications

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Displaying 5176 - 5200 of 13218

Friction drive for ultra-precision machine tools: interface compliance-based model

April 22, 1997
Author(s)
Bradley N. Damazo, Alex Slocum, A Gee
… order of meters) while incurring only marginal effort/cost in design and implementation. Furthermore, the roller/bar … the drive-bar/interface. To address uncertainties involved in the characteristics of such a drive, analysis was … Friction Drive, Machine tool design, Manufacturing Equipment …

Improved High-Current Thin-Film Multijunction Thermal Converters

June 1, 2002
Author(s)
Joseph R. Kinard Jr., Thomas E. Lipe Jr., Thomas F. Wunsch
We report on the fabrication of new thin-film multijunction thermal converters suitable for the measurement of current and new, simpler multiconverter modules that are much easier to manufacture than previous multiconverter modules.

Data Modeling to Support Environmental Information Exchange Throughout the Supply Chain

August 11, 2007
Author(s)
John V. Messina, Eric D. Simmon
… ever-increasing awareness of the environmental impact of manufacturing, more and more political organizations … (RoHS) directive, finalized by the European Union in 2003. The RoHS directive restricts imports of new … problem. This data model was then used as the key element in the development of IPCs 1752 Material Declaration standard …

Data Modeling to Support Environmental Information Exchange Throughout the Supply Chain

July 1, 2007
Author(s)
Eric D. Simmon, John V. Messina
… ever-increasing awareness of the environmental impact of manufacturing, more and more political organizations … (RoHS) directive, finalized by the European Union in 2003. The RoHS directive restricts imports of new … problem. This data model was then used as the key element in the development of IPCs 1752 Material Declaration standard …

Argon-Ion Treatment of Multi-Material Layered Surface-Electrode Traps for Noise Mitigation

November 28, 2025
Author(s)
Dustin Hite, Tobias Schaetz, Deviprasath Palani, Florian Hasse, Philip Kiefer, Frederick Bockling, Daniel Stick, Ulrich Warring
… trapped-ion quantum systems. Here, we investigate how in situ Ar+ sputtering modifies motional heating and dephasing in multi-material surface-electrode traps. Trapped ions serve … and detrimental structural modification, driven by changes in surface morphology, redeposition of sputtered material, …

Aerodynamic Damping in the Along-Wind Response of a Tall Building

February 19, 2017
Author(s)
Rene D. Gabbai, Emil Simiu
… the along-wind response of an isolated tall building in suburban terrain. The evaluation uses measurements of the … aerodynamics, building technology, damping, flexible buildings, structural dynamics, … Aerodynamic Damping in the Along-Wind Response of a Tall Building …

On the Aeroelastic Indifference of Brancusi s Endless Column

February 19, 2017
Author(s)
Rene D. Gabbai
… Column (T rgu-Jiu, Romania) is an interesting case study in bluff body aeroelasticity. It has been referred to as … unconventional shape According to calculations presented in this paper, the column s structural design , which … building technology, endless column, galloping, vortex-induced …

Time-domain measurements of afterpulsing in InGaAs/InP SPAD gated with sub-nanosecond pulses

May 28, 2012
Author(s)
Alessandro Restelli, Joshua C. Bienfang, Alan L. Migdall
… We experimentally investigate afterpulsing in an InGaAs single-photon avalanche diode (SPAD) operating in the biasing and sensing regime of periodic-gating … These techniques support single-photon counting at rates in the 100 MHz range with low afterpulse probability and are …

Mechanisms of Cement Hydration

December 22, 2011
Author(s)
Jeffrey W. Bullard, Hamlin M. Jennings, Richard A. Livingston, Andre Nonat, George W. Scherer, Jeffrey S. Schweitzer, Karen L. Scrivener, Jeffrey J. Thomas
… have been written about the kinetics of cement hydration . In this review, focus is placed on a number of recent advances in understanding the principal mechanisms that govern the … and identifying the remaining controversies or gaps in understanding. … cement hydration kinetics, building technology, calorimetry, neutron scattering, computer modeling …

Cement Hydration: Building Bridges and Dams at the Microstructure Level

July 12, 2006
Author(s)
Dale P. Bentz
… when considering the durability of cement-based materials. In this paper, experimental techniques and computer modeling … of needle penetration and rheological measurements, in concert with three-dimensional microstructural modeling. … of the water-filled pores with various size entryways in the three-dimensional microstructure. Porosity percolation …

Hurricane Damage Prediction Model for Residential Structures

November 1, 2004
Author(s)
Emil Simiu, J P. Pinelli, C Subramanian, L. Zhang, A Cope, K Gurley, James J. Filliben, S Hamid
… This paper reports progress in the development of a practical probabilistic model for the … of expected annual damage induced by hurricane winds in residential structures. The estimation of the damage is accomplished in several steps. First, basic damage modes for components of …

Distribution of Earthquake Input Energy in Structures

January 1, 2003
Author(s)
P Khashaee, B Mohraz, Fahim H. Sadek, Hai S. Lew, John L. Gross
… In developing an energy-based design approach and assessing … input energy and its distribution among energy components in a structure. For a given ductility ratio, small damping … building technology, design spectra, earthquake energy, earthquake … Distribution of Earthquake Input Energy in Structures …

Surface and Interface Properties of PVDF/Acrylic Copolymer Blends

November 1, 2002
Author(s)
Xiaohong Gu, Tinh Nguyen, Mark R. VanLandingham, D Nguyen
… PVDF/PMMA-co-PEA blends at 47 % mass fraction in a ketonic solvent are cast on glass plates by draw down to … 75 υm. After heating at 220 degrees C for 10 minutes in an air-circulated oven, coated glass plates are removed … to ambient temperature (24 degrees C). After immersing in boiling water for 10 minutes, the films are peeled from …

Talking Ceramics

November 1, 2002
Author(s)
Terrell A. Vanderah
… technical needs and state-of-the-art research activities in the materials science of microwave ceramics, especially … dielectric materials which serve as critical elements in resonators and filters …

Surface and Interface Microstructures of Coatings Systems and Their Implication on Service Life

March 1, 2002
Author(s)
Tinh Nguyen, Xiaohong Gu, Mark R. VanLandingham, D Nguyen, M Giraud
… and processing conditions during film formation. In this study, the surface and interface properties of … substrates. Both the cross-sections and surfaces that were in contact with the substrates during curing were used for … AFM, building technology, coatings, durability, interface, interphase, …

Effect of Speciation on the Apparent Diffusion Coefficient in Nonreactive Porous Systems

December 1, 2001
Author(s)
Kenneth A. Snyder, J Marchand
… is performed using a nonreactive porous material in a diffusion apparatus. Varying the ionic species … periods of time, the apparent diffsuion coefficient varies in time, increasing by a factor of ten or more. For one … iodide concentration. The theoretical analysis shows that, in nonreactive porous systems, the behavior of all the …
Displaying 5176 - 5200 of 13218
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