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Displaying 16701 - 16725 of 74066

MECHANISMS OF CRITICALITY IN ENVIRONMENTAL ADHESION LOSS

May 13, 2015
Author(s)
Christopher C. White, Kar T. Tan, Donald L. Hunston, Kristen L. Steffens, Deborah S. Jacobs, Bulent Akgun, Vogt D. Bryan
Moisture attack on adhesive joints is a long-standing scientific and engineering problem. A particularly interesting observation is that when the moisture level in certain systems exceeds a critical concentration, the bonded joint shows a dramatic loss of

Phonon Assisted Gain in a Semiconductor Quantum Dot Maser

May 13, 2015
Author(s)
Michael Gullans, Yinyiu Liu, George Stehlik, Jason Petta, Jacob M. Taylor
We develop a microscopic model for the recently demonstrated double quantum dot (DQD) maser. In characterizing the gain of this device we find that, in addition to the direct stimulated emission of photons, there is a large contribution from transitions

Prediction of Sealant Modulus Change due to Outdoor Weathering

May 13, 2015
Author(s)
Christopher C. White, Kar T. Tan, Donald L. Hunston, Adam L. Pintar, James J. Filliben
An empirically-based model has been created to predict the change in modulus for a sealant exposed to outdoor weathering. The underlying high precision data supporting this model was obtained using the NIST SPHERE (Simulated Photo degradation by High

Indoor Air Quality in High-Performing Building Case Studies: Got Data?

May 12, 2015
Author(s)
Kevin Y. Teichman, Andrew K. Persily, Steven J. Emmerich
In this paper, we review how indoor air quality (IAQ) has been addressed in case studies of high-performing buildings (HPBs), specifically the case studies described in ASHRAE’s “High Performing Buildings” magazine. We find that nearly all of the reported

Navigation Performance Evaluation for Automated Guided Vehicles

May 12, 2015
Author(s)
Roger V. Bostelman, Tsai Hong Hong, Geraldine S. Cheok
Automatic guided vehicles (AGVs), an industrial form of mobile robot, typically navigate using a central computer commanding AGV movement on predefined paths. Although, how well they follow these paths is less defined in research articles and their

New night vision goggle gain definition

May 12, 2015
Author(s)
Vyacheslav B. Podobedov, George P. Eppeldauer, Thomas C. Larason
A new definition is proposed for the calibration of Night Vision Goggle (NVG) gains. This definition is based on the measurement of radiometric input and output quantities of the NVG. While the old definition used the “equivalent fL” which is a non SI

On-wafer Magnetic Resonance of Magnetite Nanoparticles

May 11, 2015
Author(s)
Charles A. Little, Stephen E. Russek, James C. Booth, Pavel Kabos, Robert J. Usselman
Magnetic resonance measurements of ferumoxytol and TEMPO were made using an on-wafer transmission line technique with a vector network analyzer, allowing for broadband measurements of small sample volumes (4 nl) and a small numbers of spin (1 nmole). On

Towards a FPGA-controlled deep phase modulation interferometer

May 11, 2015
Author(s)
Marcelo Teran, Victor Martin, Lluis Gesa, Ignacio Mateos, Ferran Gibert, Nico Karnesis, Juan Ramos Castro, Thomas Schwarze, Oliver Gerberding, Gerhard Heinzel, Felipe Guzman, Miquel Nofrarias
Deep phase modulation interferometry was proposed as a method to enhance homodyne interferometers to work over many fringes. In this scheme, a sinusoidal phase modulation is applied in one arm while the demodulation takes place as a post-processing step

Electro-thermal Simulation of 1200 V 4H-SiC MOSFET Short-Circuit SOA

May 10, 2015
Author(s)
Tam H. Duong, Jose M. Ortiz, David W. Berning, Allen R. Hefner Jr., Sei-Hyung Ryu, John W. Palmour
The purpose of this paper is to introduce a dynamic electro-thermal simulation and analysis approach for device design and short-circuit safe-operating-area (SOA) characterization using a physics-based electro-thermal Saber®* model. Model parameter

Mid-Infrared Optical Frequency Combs based on Difference Frequency Generation for Dual-Comb Spectroscopy

May 10, 2015
Author(s)
Flavio Caldas da Cruz, Daniel I. Maser, Todd Johnson, Gabriel G. Ycas, Andrew M. Klose, Fabrizio R. Giorgetta, Ian R. Coddington, Nathan R. Newbury, Scott A. Diddams
Mid-infrared femtosecond optical frequency combs at 2.8 - 3.5 υm were produced by difference frequency generation of the spectral components of a near-infrared comb in a 3-mm long MgO:PPLN crystal. We observe strong pump depletion and 9.3 dB parametric

Evasion-Resistant Network Scan Detection

May 9, 2015
Author(s)
Richard Harang, Peter Mell
Popular network scan detection algorithms operate through evaluating external sources for unusual connection patterns and traffic rates. Research has revealed evasive tactics that enable full circumvention of existing approaches (specifically the widely

Stability and phase transfer of catalytically active platinum nanoparticle suspensions

May 9, 2015
Author(s)
Indira Sriram, Alexandra Curtin, Ann C. Chiaramonti Debay, Lauren F. Greenlee, Kavita M. Jeerage
In this work, we present a robust synthesis protocol for platinum nanoparticles that yields a monomodal dispersion of particles that are approximately 100 nm in diameter. We determine that these particles are actually agglomerates of much smaller particles

Creating and Probing Electron Whispering-Gallery Modes in Graphene

May 8, 2015
Author(s)
Yue Y. Zhao, Jonathan E. Wyrick, Donat F. Natterer, Joaquin R. Nieva, Cyprian Lewandowski, Kenji Watanabe, Takashi Taniguchi, Leonid Levitov, Nikolai B. Zhitenev, Joseph A. Stroscio
Designing high-finesse resonant cavities for electronic waves is hampered by the short coherence lengths in solids. Previous approaches, e.g. the seminal nanometer-sized quantum corrals, depend on careful positioning of adatoms at clean surfaces. Here we

Improved Model for Three-Dimensional Virtual Concrete: Anm Model

May 8, 2015
Author(s)
Edward J. Garboczi, Yang Lu, Stephen Thomas
Construction aggregate particles, fine or coarse, can be mathematically characterized using spherical harmonic series and used to simulate random parking of irregular aggregates to form a virtual mortar or concrete using the Anm model. Any other similar

Nanoscale buckling of ultrathin low-k dielectric lines during hard-mask patterning

May 7, 2015
Author(s)
Gheorghe Stan, Cristian V. Ciobanu, Igor Levin, Mark van Veenhuizen, Alan Myers, Kanwal Singh, Christopher Jezewski, Barbara Miner, Sean King
Commonly known in macroscale mechanics, buckling phenomena are now frequently also encountered in the nanoscale world as reveled in today's cutting-edge fabrication of microelectronics. The description of nanoscale buckling requires precise dimensional and

Literature Review of Mobile Robots for Manufacturing

May 6, 2015
Author(s)
Michael O. Shneier, Roger V. Bostelman
Mobile robots are devices that can move autonomously to accomplish their goals. This paper provides a review of such robots, mainly oriented towards manufacturing applications. It describes the kinds of mobile robots that are used and what criteria are
Displaying 16701 - 16725 of 74066