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Conferences

IDENTIFICATION OF GEOMETRIC NONLINEARITY FORMULATIONS AND THE INFLUENCES ON STRUCTURAL DYNAMIC RESPONSES

September 15, 2020

Author(s)

Kevin K. Wong

Both ASCE/SEI 7-16 and ASCE/SEI 41-17 design standards require that P-D effects be included in the nonlinear dynamic analysis procedure for designing new and...

RECOMMENDED OPTIONS FOR IMPROVING THE FUNCTIONAL RECOVERY OF THE BUILT ENVIRONMENT AND CRITICAL INFRASTRUCTURE

September 15, 2020

Author(s)

Siamak Sattar, Katherine J. Johnson

During a strong earthquake, commercial and residential buildings designed to meet current building codes and standards may sustain damage that significantly...

Uncertainty in the Seismic Response of Structural Components due to Material Variability

September 15, 2020

Author(s)

Christopher L. Segura, Siamak Sattar

Inherent variability in the mechanical properties of reinforcing steel and concrete introduces uncertainty into the seismic assessment of reinforced concrete...

QUANTIFICATION OF SEISMIC ENERGY DEMAND IN NONLINEAR STRUCTURES THROUGH ANALYTICAL DERIVATIONS

September 15, 2020

Author(s)

Kevin K. Wong, Steven L. McCabe

DEVELOPMENT OF A DATABASE OF EXPERIMENTAL TESTS ON FRP RETROFITTED REINFORCED CONCRETE SHEAR WALLS

September 15, 2020

Author(s)

Jazalyn D. Dukes, Siamak Sattar

Codes and standards developing organizations, such as American Society of Civil Engineers (ASCE) and American Concrete Institute (ACI), rely on experimental...

Elevated Temperature and Humidity Effects on Fibers Based on 5-amino-2-(p-aminophenyl) benzimidazole (PBIA)

September 14, 2020

Author(s)

Amanda Forster, Amy E. Engelbrecht-Wiggans, Thanh N. Hoang, Viviana Bentley, Ajay Krishnamurthy, Lucas H. Kaplan

Stress and Strain Heuristics for a Layered Elastomeric Foam at Medium Impact Rates

September 14, 2020

Author(s)

Alexander Landauer, Jared C. Van Blitterswyk, Michael Riley, Aaron Forster

Impact mitigating materials (IMMs) are used to reduce injury or damage due to a blunt impact, which often occurs at high rates or energies. Innovation in IMMs...

Comparison of theoretical and experimental failure distributions for twisted yarns

September 14, 2020

Author(s)

Amy E. Engelbrecht-Wiggans, Amanda Forster

Both untwisted and twisted bundles of fibers and wires can be found in a myriad of applications, from ballistic body armor to suspension bridge cables...

Calibration of free-space and fiber-coupled single-photon detectors

September 14, 2020

Author(s)

Thomas Gerrits, Alan L. Migdall, Joshua C. Bienfang, John H. Lehman, Sae Woo Nam, Oliver T. Slattery, Jolene D. Splett, Igor Vayshenker, Chih-Ming Wang

We present our measurements of the detection efficiency of free-space and fiber-coupled single- photon detectors at wavelengths near 851 nm and 1533.6 nm. We...

Digital Radiometer for Traceable Spectrum Sensing

September 14, 2020

Author(s)

Xifeng Lu, Dazhen Gu, Daniel G. Kuester

This paper describes a metrology instrument designed for detecting noise and interference in digital communications. A quadrature detector downconverts in-phase...

Terahertz Electromagnetically Induced Transparency in Cesium Atoms

September 14, 2020

Author(s)

Sumit Bhushan, Oliver T. Slattery, Xiao Tang, Lijun Ma

We outline a proposal to realize Electromagnetically Induced Transparency (EIT) with the potential to store Terahertz (THz) optical pulses in Cesium atoms. Such...

Loading Protocols and Backbone Curves: U.S. and Japan Perspectives

September 13, 2020

Author(s)

Bruce F. Maison, Kazuhiko Kasai, Matthew Speicher

With the gaining popularity of performance-based engineering, it is essential to have reliable estimates of component (e.g., steel beam or column) performance...

Quality of Service Optimization in Mobile Edge Computing Networks via Deep Reinforcement Learning

September 13, 2020

Author(s)

Li-Tse Hsieh, Hang Liu, Yang Guo, Robert Gazda

Mobile edge computing (MEC) is an emerging paradigm that integrates computing resources in wireless access networks to process computational tasks in close...

Seismic Stability Assessment of Steel Moment Frames and Implications for Design

September 13, 2020

Author(s)

Larry Fahnestock, Shitao Shi, Matthew Speicher

Although it is clear that a building must be capable of carrying gravity loads while developing large inelastic deformations and associated lateral...

A fast negative impedance converter for JAWS load compensation

September 10, 2020

Author(s)

Jason Underwood, Stephen Pfeiffer, Geoffrey Palo

For accurate realization of the ac volt, the Josephson Arbitrary Waveform Synthesizer (JAWS) must not be overly loaded by the electrical network in which it is...

Radiation Pressure Laser Power Meter for Industrial Laser Machining

September 10, 2020

Author(s)

Alexandra Artusio-Glimpse, Ivan Ryger, Natalia A. Azarova, Paul A. Williams, John Lehman

Demonstration and validation of a linear radiation pressure-based high-power laser power meter is presented. To date, this device is the most promising real...

Simultaneous High-speed X-ray Transmission Imaging and Absolute Dynamic Absorptance Measurements during High-power Laser-metal Processing

September 10, 2020

Author(s)

Brian Simonds, Jack R. Tanner, Alexandra B. Artusio-Glimpse, Paul A. Williams, Niranjan Parab, Cang Zhao, Tao Sun

During high-power laser metal processing, the absorbed light is intimately related to the molten metal cavity shape. For the first time, we directly and...

In Situ Monitoring of Cu/Al Laser Welding using Laser Induced Fluorescence

September 10, 2020

Author(s)

Brian Simonds, Tran N. Tran, Paul A. Williams

We investigate laser spot welding of 200 µm thick Cu and Al foils using laser-induced fluorescence (LIF). The key to strong Cu/Al welds is limited intermetallic...

Direct DC Voltages Comparison between two Programmable Josephson Voltage Standards at SCL

September 10, 2020

Author(s)

S. Yang, Stefan Cular, Alain Rufenacht, Charles J. Burroughs, Paul Dresselhaus, Samuel Benz, M. N. Ng

Standards and Calibration Laboratory (SCL) setup in 2018 a liquid helium based programmable Josephson voltage standard (PJVS) developed by the National...

A Cryogenic Quantum-Based RF Source

September 10, 2020

Author(s)

Justus A. Brevik, Alirio De Jesus Soares Boaventura, Manuel C. Castellanos Beltran, Christine A. Donnelly, Nathan E. Flowers-Jacobs, Anna E. Fox, Peter F. Hopkins, Paul D. Dresselhaus, Dylan Williams, Samuel P. Benz

We performed a preliminary calibrated measurement of the output power of a Josephson arbitrary waveform synthesizer up to 1 GHz. We present the results and...

Simultaneous in operando monitoring of depth and absorptance in high power laser processing at 200 kHz

September 9, 2020

Author(s)

Troy Allen, Brian Simonds, Jack R. Tanner, James Fraser

Laser Induced Fluorescence for Element Detection during Laser Welding of Al to Cu Foils

September 7, 2020

Author(s)

Brian Simonds

The use of laser-induced fluorescence for detecting Cu in the vapor plume under laser welding conditions is investigated. It is found that LIF is sensitive...

Powder Thermal Conductivity Measurements in L-PBF using Powder-Included Build Specimens: Internal Geometry Effect

September 3, 2020

Author(s)

Shanshan Zhang, Brandon Lane, Kevin Chou

This study investigates the thermal conductivity of 17-4PH stainless steel powder that was encapsulated into hollow specimens with different internal geometries...

Computational Process Control Compatible Dimensional Metrology Tool: Through-focus Scanning Optical Microscopy

September 3, 2020

Author(s)

Ravikiran Attota

Evaluating Unicast and MBSFN in Public Safety Networks

September 3, 2020

Author(s)

Chunmei Liu, Chen Shen, Jack Chuang, Richard A. Rouil, Hyeong-Ah Choi

Public safety incidents typically involve a significant amount of group traffic and have a stringent requirement of connection reliability. Hence multicast...

Feature-level Data Fusion for Energy Consumption Analytics in Additive Manufacturing

September 1, 2020

Author(s)

Paul Witherell

The issue of Additive Manufacturing (AM) energy consumption attracts attention in both industry and academia, as the increasing trend of AM technologies being...

A NEIGHBORHOOD-BASED NEURAL NETWORK FOR MELT POOL PREDICTION AND CONTROL

September 1, 2020

Author(s)

Paul Witherell, Vadim Shapiro, Yaqi Zhang

One of the most prevalent additive manufacturing processes, the powder bed fusion process, is driven by a moving heat source that melts metals to build a part...

Towards inter-operable enterprise systems graph-based validation of a context-driven approach for message profiling

September 1, 2020

Author(s)

Nenad Ivezic, Elena Jelisic, Boonserm Kulvatunyou, Scott Nieman, Hakju Oh, Zoran Marjanovic

Business context has a potential to become a powerful mechanism for interoperable usage and efficient maintenance of message standards. In the literature, there...

High-Resolution Biochemical Activity Measurements with Commercial Transistors

September 1, 2020

Author(s)

Seulki Cho, Son T. Le, Curt A. Richter, Arvind Balijepalli

We demonstrate that single-gated, commercially-sourced, field-effect transistors (FETs) operated with a lock- in amplifier (LIA) under closed-loop control can...

Synchronizing Stock Market Clocks to UTC(NIST)

August 29, 2020

Author(s)

Michael Lombardi

To reduce the possibility of fraudulent activity and market manipulation, the world's major stock exchanges require every clock involved in a stock market...

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