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Displaying 32476 - 32500 of 73929

Near-field microwave microscope measurements to characterize bulk material properties

June 12, 2007
Author(s)
Atif A. Imtiaz, Thomas Baldwin, Hans T. Nembach, Thomas M. Wallis, Pavel Kabos
We measured bulk dielectric (Fused Silica), semiconductor (Silicon) and metal (Copper), with a Near-field Scanning Microwave Microscope (NSMM). We use three bulk materials to test the existing quasi-static theoretical approach to de-embed the materials

Towards Development of an ISO Container to Spreader Bar Sensor System

June 12, 2007
Author(s)
Richard J. Norcross
This report describes a sensor system that determines the relative pose between a crane spreader and an ISO container. The sensor system supports efforts to transfer cargo between ships in high sea states under ONR s HiCASS program. The sensor system is a

Cryogenic Technologies Group Website

June 11, 2007
Author(s)
Marilyn R. Yetzbacher, Peter E. Bradley
Revised website of Information pertaining to the Cryogenics Group. Provides general information, staffing, contact information, articles and publications relative to the subject of cryogenics and cryogenic coolers and their applications. Of a more

Margin Failures in Crown-Like Brittle Structures: Off-Axis Loading

June 11, 2007
Author(s)
Chris Ford, T Qasim, M T. Bush, X Z. Hu, Mahek Shah, Vibhu Saxena, Brian R. Lawn
The effect of off-axis loading of compliant indenters on the initiation of cracks at the margins of dental crown-like dome structures consisting of glass shells back-filled with an epoxy resin is examined. As in previous studies on similar structures but

Real-Time Deployment of Multihop Relays for Range Extension

June 11, 2007
Author(s)
Michael R. Souryal, Johannes Geissbuehler, Leonard E. Miller, Nader Moayeri
When the range of single-hop wireless communication is limited by distance or harsh radio propagation conditions, relays can be used to extend the communication range through multihop relaying. This paper targets the need in certain scenarios for rapid

Building Information for Emergency Responders

June 8, 2007
Author(s)
Stephen J. Treado, Alan B. Vinh, David G. Holmberg, Michael A. Galler
This paper describes a methodology for controlling access to building information to approved external entities such as police, fire and public safety officials. Building automation systems frequently monitor critical building information, including the

Inter-Laboratory Comparison of CMOS Distortion Measurements

June 8, 2007
Author(s)
Catherine A. Remley, Joe Gering, Susan L. Sweeney, C. Michael Olsen, Cliff Xie, Dave K. Walker, Tom McKay, John J. Pekarik
We describe an interlaboratory measurement comparison of distortion in a CMOS low-noise device operating under weakly nonlinear conditions. Issues that commonly arise in performing and interpreting nonlinear measurements are discussed, such as power vs

Liposome Characterization with Fluorescence Cumulant Analysis

June 8, 2007
Author(s)
Joseph E. Reiner, Andreas Jahn, Laurie E. Locascio, Michael Gaitan, John J. Kasianowicz
Liposomes are self-assembled spherical vesicles comprised of a lipid bilayer membrane that segregates an internal aqueous environment from an external aqueous environment. These nanometer-scale structures have demonstrated potential for targeted drug

A Combinatorial Testing Strategy for Concurrent Programs

June 7, 2007
Author(s)
Yu Lei, Richard Carver, Raghu N. Kacker, David Kung
One approach to testing concurrent programs is called reachability testing, which derives test sequences automatically and on-the-fly, without constructing a static model. Existing reachability testing algorithms are exhaustive in that they are intended to

Teaching Materials Science to Children, Ages 8-14

June 7, 2007
Author(s)
Robert D. Shull
A pre-high school science program, Adventure In Science (AIS), has been running in the Gaithersburg, Maryland area for the past 33 years. It s President, Dr. Robert D. Shull, a scientist in the Materials Science and Engineering Laboratory at the National

3-D Segmentation and Motion Estimation of Range Data for Crash Prevention

June 6, 2007
Author(s)
Hamid Gharavi
In this paper we present a 3-D object segmentation and motion estimation scheme of range video data for crash prevention applications. The segmentation is based on slope values of every point in the scene with which atomic regions are constructed by region

A W-band polarization converter and isolator

June 6, 2007
Author(s)
Charles Dietlein, A. Luukanen, Zoya Popovic, Erich N. Grossman
This paper presents a 95-GHz printed low-loss linear-to-circular polarizer designed as a component of an active direct-detection millimeter-wave imaging system. The periodic printed structure presents different reactances to the TE and TM polarizations

Application of the CIPM MRA to Radionuclide Metrology

June 6, 2007
Author(s)
Lisa R. Karam
The adoption of the Mutual Recognition Arrangement by the CIPM in 1996 had an almost immediate affect on the approach national measurement laboratories took in the measurement laboratories took in the measurement of radioactivity, and how their abilities

North American Environmental Compliance Attitudes Towards Electronics

June 6, 2007
Author(s)
Krista Botsford, John V. Messina, Eric D. Simmon
More and more countries are beginning eco-compliance legislation for electronics products. Where does the USA stand? This paper will discuss the following areas and attitudes towards environmental compliance in the USA: levels of legislation, who is (or

Aging Effects on the Dynamic Tensile Response of Zylon Fibers

June 4, 2007
Author(s)
Richard L. Rhorer, Joannie W. Chin, Amanda L. Forster, Weinong W. Chen, Bo Song, Xu Nie
This paper reports on dynamic tests of fibers used in soft body armor. The type of fiber tested is poly(p-phenylene-2,6- benzobisoxaxole) (PBO), or brand name Zylon. Aged fibers were tested using a modified split Hopkinson pressure bar that loads the

An Apparatus For Folding Yarns And Woven Fabrics Of Ballistic Fibers

June 4, 2007
Author(s)
Walter G. McDonough, Jae Hyun Kim, Nolan J. Brandenburg, William R. Blair, Gale A. Holmes
Folding of ballistic fibers comprising soft body armor may be a factor in the performance deterioration that has been observed in used soft body armor. To quantify the impact of this mechanism, an apparatus was designed and built to simulate the folding

Design of SNS Josephson Arrays for High Voltage Applications

June 4, 2007
Author(s)
Paul Dresselhaus, Samuel Benz, Charles J. Burroughs, Norman F. Bergren, Yonuk Chong
The voltage from a single, microwave-biased Josephson junction is a small quantity; thus useful voltages are only generated through series arrays of many thousands of junctions. Arrays of superconductor-normal metal-superconductor junctions have been

Direct Electrostatic Calibration of Hybrid Sensors for Small Force Measurement

June 4, 2007
Author(s)
Koo-Hyun Chung, Gordon A. Shaw, Jon R. Pratt
The measurement of forces from piconewtons to millinewtons is an area of interest from both an applied and pure research standpoint, however creating a link between small forces and the International System of Units (SI) has been difficult. In this work, a
Displaying 32476 - 32500 of 73929
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