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Displaying 1576 - 1600 of 73898

The Black Hole Explorer: Instrument System Overview

June 14, 2024
Author(s)
Daniel P. Marrone, Janice Houston, Kazunori Akiyama, Bryan Bilyeu, Don Boroson, Paul Grimes, Kari Haworth, Robert Lehmensiek, Eliad Peretz, Hannah Rana, Laura Sinclair, Sridharan Tirupati Kumara, Ranjani Srinivasan, Edward Tong, Jade Wang, Jonathan Weintroub, Michael D. Johnson
The Black Hole Explorer (BHEX) is a space very-long-baseline interferometry (VLBI) mission concept that is currently under development. BHEX will study supermassive black holes at unprecedented resolution, isolating the signature of the "photon ring" —

Viscoelastic Assessment Method of Polymeric Foams under Cyclic Fatigue

June 14, 2024
Author(s)
Moira M Foster, Daniel C Morrison, Alexander Landauer, Mark Herynk, Leslie Lamberson
Many energy absorption applications utilize flexible polymeric foams for their viscoelastic properties. It is desired that the material will perform consistently across repeated compression cycles. This study examines the effect of fatigue at low strain

Bubbles Enable Volumetric Negative Compressibility in Metastable Elastocapillary Systems

June 13, 2024
Author(s)
Davide Caprini, Francesco Battista, Pawel Zajdel, Giovanni Di Muccio, Carlo Guardiani, Benjamin Trump, Marcus Carter, Andrey Yakovenko, Eder Amayuelas, Luis Bartolome, Simone Meloni, Yaroslav Grosu, Carlo Massimo Casciola, Alberto Giacomello
Although coveted in applications, few materials expand when subject to compression or contract under decompression, i.e., exhibit negative compressibility. A key step to achieve such counterintuitive behaviour is the destabilisations of (meta)stable

The Black Hole Explorer: Motivation and Vision

June 13, 2024
Author(s)
Michael D. Johnson, Kazunori Akiyama, Rebecca Baturin, Bryan Bilyeu, Lindy Blackburn, Don Boroson, Alejandro Cardena-Avendano, Andrew Chael, Chi-kwan Chan, Dominic Chang, Peter Cheimets, Cathy Chou, Sheperd S. Doeleman, Joseph Farah, Peter Galison, Ronald Gamble, Charles F. Gammie, Zachary Gelles, Jose L. Gomez, Samuel E. Gralla, Paul Grimes, Shahar Hadar, Kari Haworth, Kazuhiro Hada, Michael H. Hecht, Mareki Honma, Janice Houston, Ben Hudson, Sara Issaoun, He Jia, Svetlana Jorstad, Jens Kauffmann, Yuri Kovalev, Leonid I. Gurvits, Peter Kurczynski, Robert Lafon, Alexandru Lupsasca, Robert Lehmensiek, Chung-Pei Ma, Daniel P. Marrone, Alan P. Marscher, Gary J. Melnick, Ramesh Narayan, Kotaro Niinuma, Scott C. Noble, Eric J. Palmer, Daniel C. Palumbo, Lenny Paritsky, Eliad Peretz, Dominic Pesce, Alexander Plavin, Eliot Quataert, Hannah Rana, Angelo Ricarte, Freek Roelofs, Katia Shtyrkova, Laura Sinclair, Jeffrey Small, Sridharan Tirupati Kumara, Ranjani Srinivasan, Andrew Strominger, Paul Tiede, Edward Tong, Jade Wang, Jonathan Weintroub, Maciek Wielgus, George Wong, Xinyue Alice Zhang
We present the Black Hole Explorer (BHEX), a mission that will produce the sharpest images in the history of astronomy by extending submillimeter Very-Long-Baseline Interferometry (VLBI) to space. BHEX will discover and measure the bright and narrow

Maximum Luminous Intensity of LED-lighted X signs for Airport Runways

June 12, 2024
Author(s)
Yoshihiro Ohno, Maritoni Litorja, Carl Miller
This is a report for Inter-agency agreement 693KA9-18-N-00023 "Maximum Luminous Intensity for LED Signaling in an Airport Environment" by Federal Aviation Administration (FAA) and National Institute of Standards and Technology (NIST). The LED-based lighted

Reactor Antineutrino Directionality Measurement with the PROSPECT-I Detector

June 12, 2024
Author(s)
Hans Mumm, Manoa Andriamirado, Baha Balantekin, Christopher Bass, Ohana Benevides Rodrigues, Ethan Bernard, Nathaniel Bowden, Christopher Bryan, Rachel Carr, Timothy Classen, Andrew Conant, Geoffrey Deichert, Michelle Dolinski, Anna Erickson, Alfredo Galindo-Uribarri, Sasmit Gokhale, Chris Grant, Sunej Hans, Adam Hansell, Karsten Heeger, Blaine Heffron, David Jaffe, Shashank Jayakumar, John Koblanski, Paige Kunkle, Charles Lane, Bryce Littlejohn, Adrian Lozano Sanchez, Xiaobin (Jeremy) Lu, Jelena Maricic, Michael Mendenhall, Andrew Meyer, Radovan Milincic, Paul Mueller, Russell Neilson, Xin Qian, Christian Roca, Richard Rosero, Pranava Teja Surukuchi, Felicia Sutanto, Diego Venegas-Vargas, Pierce Weatherly, James Wilhelmi, Minfang Yeh, Chao Zhang, Xianyi Zhang
The PROSPECT-I detector has several features that enable measurement of the direction of a compact neutrino source. In this paper, a detailed report on the directional measurements made on electron antineutrinos emitted from the High Flux Isotope Reactor

Toward an International Standardisation Roadmap for Nanomedicine

June 12, 2024
Author(s)
Bryant C. Nelson, Gerrit Borchard, Luigi Calzolai, Fanny Caputo, Georges Favres, Fisicaro Fisicaro, Emeric Frejafon, Nazende Gunday-Tureli, Denis Koltsov, Caterina Minelli, Francois-Xavier Ouf, Jeremie Parot, Adriele Prina Mello, Shan Zou
The French National Measurement Institute (LNE) has initiated a series of events to identify priorities for test methods and their harmonisation that directly address regulatory needs in Nanomedicine. The workshop entitled "The International

Three-dimensional characterization of particle size, shape, and internal porosity for Apollo 11 and Apollo 14 lunar regolith and JSC-1A lunar regolith soil simulant

June 8, 2024
Author(s)
Jay Goguen, Andrew Sharits, Ann Chiaramonti Debay, Thomas V. Lafarge, Edward Garboczi
Samples of soils collected by the Apollo 11 mission (10084) and the Apollo 14 mission (14163) were obtained from the NASA CAPTEM program. The particle size, shape, and internal porosity were characterized in three dimensions (3D) using a combination of X

Laser Offset Stabilization with Chip-Scale Atomic Diffractive Elements

June 7, 2024
Author(s)
Heleni Krelman, Ori Nefesh, Kfir Levi, Douglas Bopp, Songbai Kang, Liron Stern, John Kitching
Achieving precise and adjustable control over laser frequency is an essential requirement in numerous applications such as precision spectroscopy, quantum control, and sensing. In many of such applications it is desired to stabilize a laser with a variable

Quantifying Mechanical Abrasion of AgNP Nanocomposites used in 3D Printing: Influence of AgNP content on abrasion products and rate of microplastic production

June 7, 2024
Author(s)
Joana Sipe, William Berger, Nathan Bossa, Melissa Chernick, Keana C. K. Scott, Alan Kennedy, Treye Thomas, Christine Ogilvie, Mark Wiesner
Nanomaterials are used in polymer composites to enhance plastic products' properties. Silver nanoparticles (AgNPs) are added to composites for their antimicrobial and fungicidal properties. Polyethylene terephthalate glycol polymer (PETG) AgNP composite

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

Exploring Nonlinear Flame Speed Inhibition Effects in Mixtures of R1234yf and R32

June 6, 2024
Author(s)
Raik Hesse, Roman Glaznev, Raymond Langer, Christian Felix Schwenzer, Valeri Babushok, Gregory Linteris, Heinz Pitsch, Joachim Beeckmann
This study investigates the flame speed inhibition effects in R1234yf and R32 mixtures, two hydrofluorocarbon (HFC) refrigerants with low global warming potential but mild flammability. The laminar flame speed (S0L,u) is a crucial parameter for assessing

On the Semidirect Discrete Logarithm Problem in Finite Groups

June 6, 2024
Author(s)
Christopher Battarbee, Giacomo Borin, Julian Brough, Ryann Cartor, Tobias Hemmert, Nadia Heninger, David Jao, Delaram Kahrobaei, Laura Maddison, Edoardo Persichetti, Angela Robinson, Daniel Smith-Tone, Rainer Steinwandt
We present an efficient quantum algorithm for solving the semidirect discrete logarithm problem (SDLP) in any finite group. The believed hardness of the semidirect discrete logarithm problem underlies more than a decade of works constructing candidate post
Displaying 1576 - 1600 of 73898
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