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Displaying 2076 - 2100 of 2958

The causal relationship between melt pool geometry and energy absorption measured in real time during laser-based manufacturing

December 16, 2021
Author(s)
Brian Simonds, Jack R. Tanner, Aly Artusio-Glimpse, Paul A. Williams, Niranjan Parab, Cang Zhao, Tao Sun
During laser powder bed fusion additive manufacturing, a protean pool of molten metal governs a complex energy absorption process as it presents as either a highly reflective surface, a deeply absorbing cavity (a keyhole), or some amalgamation thereof. To

Electron Impact Total Ionization Cross Sections of CF 4 , C 2 F^6^ and C 3 F^8^

October 12, 2021
Author(s)
H Nishimura, W M. Huo, Yong Sik Kim, M A. Ali
Both theoretical and experimental electron-impact total ionization cross sections of CF 4, C 2F 6 and C 3F 8 are presented. The experimental cross sections have been measured as a function of incident electron energy T from threshold to 3 keV. A parallel

Towards Absolute Viability Measurements for Bacteria

September 12, 2021
Author(s)
Joy Dunkers, Hariharan K. Iyer, Brynna H. Jones, Charles Camp, Stephan J. Stranick, Nancy Lin
Quantifying viable, vegetative bacteria is a critical measurand in healthcare diagnostics, food safety, and antimicrobial development. Viability determination has traditionally relied on such techniques as plate counting, colorimetric or fluorescent

Fracture Modes in Brittle Coatings With Large Interlayer Modulus Mismatch

October 16, 2008
Author(s)
Herzl Chai, Brian R. Lawn, S Wuttiphan
Fracture modes in a model glass/polymer coating/substrate system indented with hard spheres are investigated. The large modulus mismatch between the glass and polymer results in distinctive transverse fracture modes in the brittle coating: exaggerated

Multi-timescale Frequency-Phase Matching for High-Yield Nonlinear Photonics

November 6, 2025
Author(s)
Mahmoud Jalali Mehrabad, Lida Xu, Gregory Moille, Christopher Flower, Supratik Sarkar, Apurva Padhye, Shao-Chien Ou, Daniel Suarez-Ferero, Mahdi Ghafariasl, Yanne K. Chembo, Kartik Srinivasan, Mohammad Hafezi
Integrated nonlinear photonics struggles to deliver wafer-scale functional device yields: Nanometer-level fabrication variations compromise the strict frequency-phase matching mandated by energy- and momentum-conserving nonlinear processes. We introduce

A Helmholtz Energy Equation of State for 3,3,3-Trifluoroprop-1-ene (R-1243zf)

January 15, 2025
Author(s)
Ryo Akasaka, Eric Lemmon
A new fundamental equation of state expressed as a function of the Helmholtz energy is presented for 3,3,3-trifluoroprop-1-ene (R-1243zf). The equation is valid from the triple point temperature (122.35 K) to 430 K at pressures up to 35 MPa. The expected

Quantum metrology algorithms for dark matter searches with clocks

June 7, 2024
Author(s)
Muhammad Zaheer, Naleli Matjelo, David Hume, Marianna Safronova, David Leibrandt
Quantum metrology involves improving the sensitivity of a quantum sensor to a signal while circumventing sensitivity to noise using algorithms from quantum information science. Atomic clocks are among the most sensitive quantum sensors, with recent

EOS-CG-2021: A Mixture Model for the Calculation of Thermodynamic Properties of CCS Mixtures

November 16, 2023
Author(s)
Tobias Neumann, Stefan Herrig, Ian Bell, Robin Beckmuller, Eric W. Lemmon, Monika Thol, Roland Span
Thermodynamic properties for CCS-relevant mixtures can be calculated with the fundamental equation of state presented in this work over wide ranges of pressure, temperature, and composition for gas, liquid, and supercritical states, as well as phase

Beating thermal noise in a dynamic signal measurement by a nanofabricated cavity-optomechanical sensor

March 15, 2023
Author(s)
Mingkang Wang, Diego Perez Morelo, Georg Ramer, Georges Pavlidis, Jeffrey Schwartz, Liya Yu, Robert Ilic, Andrea Centrone, Vladimir Aksyuk
Thermal fluctuations often impose both fundamental and practical measurement limits on high-performance sensors, motivating the development of techniques that bypass the limitations imposed by thermal noise outside cryogenic environments. Here, we

Physics-based Models for photonic thermometers

December 1, 2022
Author(s)
Zeeshan Ahmed
Resistance thermometry, meticulously developed over the last century, provides a time-tested method for taking temperature measurements. However, fundamental limits to resistance-based approaches along with a desire to reduce the cost of sensor ownership

Hybrid quantum edge computing network

October 4, 2022
Author(s)
Lijun Ma, Leah Ding
Edge computing network and quantum network are two emerging technologies in current communication fields. Edge computing has emerged to support the computational demand of delay-sensitive applications in which substantial computing and storage are deployed

Intrinsically accurate sensing with an optomechanical accelerometer

May 18, 2022
Author(s)
Benjamin Reschovsky, David Long, Feng Zhou, Yiliang Bao, Richard A. Allen, Jason J. Gorman, Thomas W. LeBrun
We demonstrate a microfabricated optomechanical accelerometer that is capable of percent-level accuracy without external calibration. To achieve this capability, we use a mechanical model of the device behavior that can be characterized by the thermal

Quantifying Receiver Nonlinearities in VNA Measurements for the WR-15 Waveguide Band

March 15, 2022
Author(s)
Angela Stelson, Aaron Hagerstrom, Jeffrey Jargon, Chris Long
Scattering (S-) parameters are fundamental to numerous microwave quantities including antenna factors, microwave power, and phase. The uncertainty in S-parameter measurements is influenced by the test setup, including instrument noise, drift, position of

VEMOS: A GUI for Evaluation of Similarity Metrics on Complex Data Sets

June 7, 2021
Author(s)
Gunay Dogan, Eve Fleisig
Similarity and dissimilarity metrics are a fundamental component of many tasks requiring the analysis and comparison of complex, often visual data. Applications from deep learning to forensics require ways to effectively identify images, find clusters or
Displaying 2076 - 2100 of 2958
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