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arXiv 2022年

作者： Byers, Michael Wright, Ewan Boley, Aaron Byers, Cameron Department of Political Science University of British Columbia VancouverBC Canada Interdisciplinary Studies Graduate Program University of British Columbia VancouverBC Canada Department of Physics and Astronomy University of British Columbia VancouverBC Canada Bachelor of Engineering Program University of Victoria VictoriaBC Canada

In 2020, over 60% of launches to low Earth orbit resulted in one or more rocket bodies being abandoned in orbit and eventually returning to Earth in an uncontrolled manner. When they do so, between 20 and 40% of their mass survives the heat of atmospheric reentry. Many of the surviving pieces are heavy enough to pose serious risks to people, on land, at sea, and in airplanes. There is no international consensus on the acceptable level of risk from reentering space objects. This is sometimes a point of contention, such as when a 20 tonne Long March 5B core stage made an uncontrolled reentry in May 2021. Some regulators, including the US, France, and ESA, have implemented a 1 in 10, 000 acceptable casualty risk (i.e., statistical threat to human life) threshold from reentering space objects. We argue that this threshold ignores the cumulative effect of the rapidly increasing number of rocket launches. It also fails to address low risk, high consequence outcomes, such as a rocket stage crashing into a high-density city or a large passenger aircraft. In the latter case, even a small piece could cause hundreds of casualties. Compounding this, the threshold is frequently ignored or waived when the costs of adherence are deemed excessive. We analyse the rocket bodies that reentered the atmosphere from 1992-2021 and model the associated cumulative casualty expectation. We then extrapolate this trend into the near future (2022-2032), modelling the potential risk to the global population from uncontrolled rocket body reentries. We also analyse the population of rocket bodies that are currently in orbit and expected to deorbit soon, and find that the risk distribution is significantly weighted to latitudes close to the equator. This represents a disproportionate burden of casualty risk imposed on the countries of the Global South by major spacefaring countries. Modern rockets have reignitable engines, allowing controlled reentries into remote areas of the oceans. This, combine

关键词： Rockets

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Two-step electronic response to magnetic ordering in a van der Waals ferromagnet

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Physical Review B 2024年第4期109卷 045416-045416页

作者： Han Wu Jian-Xin Zhu Lebing Chen Matthew W. Butcher Ziqin Yue Dongsheng Yuan Yu He Ji Seop Oh Bin Gao Jianwei Huang Shan Wu Cheng Gong Yucheng Guo Sung-Kwan Mo Jonathan Denlinger Donghui Lu Makoto Hashimoto Matthew B. Stone Alexander I. Kolesnikov Songxue Chi Junichiro Kono Andriy H. Nevidomskyy Robert J. Birgeneau Pengcheng Dai Ming Yi Department of Physics and Astronomy and Rice Center for Quantum Materials Rice University Houston Texas 77005 USA Theoretical Division Los Alamos National Laboratory Los Alamos New Mexico 87545 USA Center for Integrated Nanotechnologies Los Alamos National Laboratory Los Alamos New Mexico 87545 USA Department of Physics University of California at Berkeley Berkeley California 94720 USA Applied Physics Graduate Program Smalley-Curl Institute Rice University Houston Texas 77005 USA Materials Sciences Division Lawrence Berkeley National Laboratory Berkeley California 94720 USA National Institute for Materials Science 1-1 Namiki Tsukuba Ibaraki 305-0044 Japan Department of Applied Physics Yale University New Haven Connecticut 06511 USA Department of Electrical and Computer Engineering and Quantum Technology Center University of Maryland College Park Maryland 20742 USA Advanced Light Source Lawrence Berkeley National Laboratory Berkeley California 94720 USA Stanford Synchrotron Radiation Lightsource SLAC National Accelerator Laboratory Menlo Park California 94025 USA Neutron Scattering Division Oak Ridge National Laboratory Oak Ridge Tennessee 37831 USA Department of Electrical and Computer Engineering Rice University Houston Texas 77005 USA Smalley-Curl Institute Rice University Houston Texas 77005 USA Department of Material Science and Nanoengineering Rice University Houston Texas 77005 USA Department of Materials Science and Engineering University of California Berkeley California 94720 USA

The two-dimensional material Cr2Ge2Te6 is a member of the class of insulating van der Waals (vdW) magnets. Here, using high resolution angle-resolved photoemission spectroscopy in a detailed temperature dependence study, we identify a clear response of the electronic structure to a dimensional crossover in the form of two distinct temperature scales marking onsets of modifications in the electronic structure. Specifically, we observe Te p-orbital-dominated bands to undergo changes at the Curie transition temperature TC while the Cr d-orbital-dominated bands begin evolving at a higher temperature scale. Combined with neutron scattering, density functional theory calculations, and Monte Carlo simulations, we find that the electronic system can be consistently understood to respond sequentially to the distinct temperatures at which in-plane and out-of-plane spin correlations exceed a characteristic length scale. Our findings reveal the sensitivity of the orbital-selective electronic structure for probing the dynamical evolution of local moment correlations in vdW insulating magnets.

关键词： Electronic structure Magnetic order Magnetic phase transitions Van der Waals systems Angle-resolved photoemission spectroscopy

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Leaky-wave metasurfaces for integrated photonics

arXiv

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arXiv 2022年

作者： Huang, Heqing Overvig, Adam C. Xu, Yuan Malek, Stephanie C. Tsai, Cheng-Chia Alù, Andrea Yu, Nanfang Department of Applied Physics and Applied Mathematics Columbia University New YorkNY10027 United States Photonics Initiative Advanced Science Research Center City University of New York New YorkNY10031 United States Physics Program Graduate Center of the City University of New York New YorkNY10016 United States

Metasurfaces have been rapidly advancing our command over the many degrees of freedom of light within compact, lightweight devices. However, so far, they have mostly been limited to manipulating light in free space. Grating couplers provide the opportunity of bridging far-field optical radiation and in-plane guided waves, and thus have become fundamental building blocks in photonic integrated circuits. However, their operation and degree of light control is much more limited than metasurfaces. Metasurfaces integrated on top of guided wave photonic systems have been explored to control the scattering of light off-chip with enhanced functionalities – namely, point-by-point manipulation of amplitude, phase or polarization. However, these efforts have so far been limited to controlling one or two optical degrees of freedom at best, and to device configurations much more complex compared to conventional grating couplers. Here, we introduce leaky-wave metasurfaces, which are based on symmetry-broken photonic crystal slabs that support quasi-bound states in the continuum. This platform has a compact form factor equivalent to the one of conventional grating couplers, but it provides full command over amplitude, phase and polarization (four optical degrees of freedom) across large apertures. We present experimental demonstrations of various functionalities for operation at λ = 1.55 μm based on leaky-wave metasurfaces, including devices for phase and amplitude control at a fixed polarization state, and devices controlling all four optical degrees of freedom. Our results merge the fields of guided and free-space optics under the umbrella of metasurfaces, exploiting the hybrid nature of quasi-bound states in the continuum, for opportunities to advance in disruptive ways imaging, communications, augmented reality, quantum optics, LIDAR and integrated photonic systems. © 2022, CC BY.

关键词： Guided electromagnetic wave propagation

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Mode-locked laser in nanophotonic lithium niobate

arXiv

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arXiv 2023年

作者： Guo, Qiushi Sekine, Ryoto Williams, James A. Gutierrez, Benjamin K. Gray, Robert M. Ledezma, Luis Costa, Luis Roy, Arkadev Zhou, Selina Liu, Mingchen Marandi, Alireza Department of Electrical Engineering California Institute of Technology PasadenaCA United States Photonics Initiative Advanced Science Research Center City University of New York NY United States Physics Program Graduate Center City University of New York New YorkNY United States Department of Applied Physics California Institute of Technology PasadenaCA United States Jet Propulsion Laboratory PasadenaCA United States

Mode-locked lasers (MLLs) have enabled ultrafast sciences and technologies by generating ultrashort pulses with peak powers substantially exceeding their average powers. Recently, tremendous efforts have been focused on realizing integrated MLLs not only to address the challenges associated with their size and power demand, but also to enable transforming the ultrafast technologies into nanophotonic chips, and ultimately to unlock their potential for a plethora of applications. However, till now the prospect of integrated MLLs driving ultrafast nanophotonic circuits has remained elusive because of their typically low peak powers, lack of controllability, and challenges with integration with appropriate nanophotonic platforms. Here, we overcome these limitations by demonstrating an electrically-pumped actively MLL in nanophotonic lithium niobate based on its hybrid integration with a III-V semiconductor optical amplifier. Our MLL generates ∼4.8 ps optical pulses around 1065 nm at a repetition rate of ∼10 GHz, with pulse energy exceeding 2.6 pJ and a high peak power beyond 0.5 W. We show that both the repetition rate and the carrier-envelope-offset of the resulting frequency comb can be flexibly controlled in a wide range using the RF driving frequency and the pump current, paving the way for fully-stabilized on-chip frequency combs in nanophotonics. Our work marks an important step toward fully-integrated nonlinear and ultrafast photonic systems in nanophotonic lithium niobate. Copyright © 2023, The Authors. All rights reserved.

关键词： Niobium compounds

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Prospects for neutrino astrophysics with Hyper-Kamiokande

Prospects for neutrino astrophysics with Hyper-Kamiokande

引用

37th International Cosmic Ray Conference, ICRC 2021

作者： Yano, Takatomi Abe, K. Adrich, P. Aihara, H. Akutsu, R. Alekseev, I. Ali, A. Alj Hakim, Y.I. Ameli, F. Anthony, L.H.V. Araya, A. Asaoka, Y. Aushev, V. Ballester, F. Bandac, I. Barbi, M. Barr, G. Batkiewicz-Kwasniak, M. Bellato, M. Berardi, V. Bernard, L. Bernardini, E. Berns, L. Bhadra, S. Bian, J. Blanchet, A. Blondel, A. Boiano, A. Bolognesi, S. Bonavera, L. Booth, N. Bordoni, S. Borjabad, S. Boschi, T. Bose, D. Boyd, S.B. Bozza, C. Bravar, A. Bronner, C. Brown, L. Bubak, A. Buchowicz, A. Buizza Avanzini, M. Cafagna, F.S. Calabria, N.F. Calvo-Mozota, J.M. Cao, S. Carroll, A. Catanesi, M.G. Cebriàn, S. Chakraborty, S. Choi, J.H. Choubey, S. Cicerchia, M. Coleman, J. Collazuol, G. Cuen-Rochin, S. Danilov, M. Díaz López, G. De la Fuente, E. de Perio, P. De Rosa, G. Dealtry, T. Densham, C.J. Dergacheva, A. Deshmukh, N. Devi, M.M. Di Lodovico, F. Di Meo, P. Di Palma, I. Doyle, T.A. Drakopoulou, E. Drapier, O. Dumarchez, J. Eklund, L. El Hedri, S. Ellis, J. Emery, S. Esmaili, A. Esteve, R. Fedotov, S. Feng, J. Fernandez, P. Fernández-Martinez, E. Ferrario, P. Ferrazzi, B. Finch, A. Finley, C. Fiorillo, G. Fitton, M. Friend, M. Fujii, Y. Fujisawa, C. Fukuda, Y. Galinski, G. Gao, J. Garde, C. Garfagnini, A. Garode, S. Gialanella, L. Giganti, C. Gomez-Cadenas, J.J. Gonin, M. González-Nuevo, J. Gorin, A. Gornea, R. Gousy-Leblanc, V. Gramegna, F. Grassi, M. Grella, G. Guigue, M. Hadley, D.R. Harada, M. Hartz, M. Hassani, S. Hastings, N.C. Hayato, Y. Hernando-Morata, J.A. Herrero, V. Hiraide, K. Holin, A. Hoshina, K. Hultqvist, K. Iacob, F. Ichikawa, A.K. Idrissi Ibnsalih, W. Ieki, K. Ikeda, M. Ioannisian, A. Ishida, T. Ishidoshiro, K. Ishino, H. Ishitsuka, M. Israel, H.T. Ito, H. Itow, Y. Izumi, N. Izumiyama, S. Jakkapu, M. Jamieson, B. Jang, J.S. Jo, H.S. Jonsson, P. Joo, K.K. Kajita, T. Kakuno, H. Kameda, J. Kaneshima, R. Kano, Y. Karlen, D. Kataoka, Y. Kato, A. Katori, T. Kazarian, N. Khabibullin, M. Kamioka Observatory ICRR The University of Tokyo Mozumi Kamioka Hida Gifu456 Japan University of Tokyo Institute for Cosmic Ray Research Kamioka Observatory Kamioka Japan University of Tokyo Institutes for Advanced Study Kashiwa Japan University of Tokyo Next-generation Neutrino Science Organization Kamioka Japan National Centre for Nuclear Research Warsaw Poland University of Tokyo Department of Physics Tokyo Japan TRIUMF VancouverBC Canada P.N.Lebedev Physical Institute of the Russian Academy of Sciences Moscow Russia Kyoto University Department of Physics Kyoto Japan Imperial College London Department of Physics London United Kingdom INFN Sezione di Roma Università Sapienza Dipartimento di Fisica Roma Italy University of Tokyo Earthquake Research Institute Tokyo Japan Kyiv National University Department of Nuclear Physics Kyiv Ukraine Valencia Spain Laboratorio Subterráneo de Canfranc Estación Canfranc Spain University of Regina Department of Physics ReginaSK Canada Oxford University Department of Physics Oxford United Kingdom H. Niewodniczański Institute of Nuclear Physics PAN Cracow Poland INFN Sezione di Padova Università di Padova Dipartimento di Fisica Padova Italy INFN Sezione di Bari Università e Politecnico di Bari Bari Italy Ecole Polytechnique IN2P3-CNRS Laboratoire Leprince-Ringuet Palaiseau France Tokyo Institute of Technology Department of Physics Tokyo Japan York University Department of Physics and Astronomy TorontoON Canada University of California Irvine Department of Physics and Astronomy IrvineCA United States Laboratoire de Physique Nucleaire et de Hautes Energie IN2P3 CNRS Sorbonne Universitè Paris France INFN Sezione di Napoli Napoli Italy IRFU CEA Universitè Paris-Saclay Gif-sur-Yvette France University of Oviedo Applied Mathematical Modeling Group Department of Physics Oviedo Spain University of Victoria Department of Physics and Astronomy VictoriaBC Canada University of Geneva Section

Hyper-Kamiokande is a multi-purpose next generation neutrino experiment. The detector is a two-layered cylindrical shape ultra-pure water tank, with its height of 64 m and diameter of 71 m. The inner detector will be surrounded by tens of thousands of twenty-inch photosensors and multi-PMT modules to detect water Cherenkov radiation due to the charged particles and provide our fiducial volume of 188 kt. This detection technique is established by Kamiokande and Super-Kamiokande. As the successor of these experiments, Hyper-K will be located deep underground, 600 m below Mt. Tochibora at Kamioka in Japan to reduce cosmic-ray backgrounds. Besides our physics program with accelerator neutrino, atmospheric neutrino and proton decay, neutrino astrophysics is an important research topic for Hyper-K. With its fruitful physics research programs, Hyper-K will play a critical role in the next neutrino physics frontier. It will also provide important information via astrophysical neutrino measurements, i.e., solar neutrino, supernova burst neutrinos and supernova relic neutrino. Here, we will discuss the physics potential of Hyper-K neutrino astrophysics. © Copyright owned by the author(s).

关键词： Water tanks

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Measuring the Substructure Mass Power Spectrum of 23 SLACS Strong Galaxy-Galaxy Lenses with Convolutional Neural Networks

arXiv

引用

arXiv 2024年

作者： Fagin, Joshua Vernardos, Georgios Tsagkatakis, Grigorios Pantazis, Yannis Shajib, Anowar J. O’Dowd, Matthew The Graduate Center The City University of New York 365 Fifth Avenue New YorkNY10016 United States Department of Astrophysics American Museum of Natural History Central Park West and 79th Street NY10024-5192 United States Department of Physics and Astronomy Lehman College The CUNY BronxNY10468 United States Institute of Computer Science FORTH HeraklionGR-70013 Greece Institute of Applied and Computational Mathematics FORTH HeraklionGR-70013 Greece Department of Astronomy & Astrophysics University of Chicago ChicagoIL606374 United States Kavli Institute for Cosmological Physics University of Chicago ChicagoIL60637 United States

Strong gravitational lensing can be used as a tool for constraining the substructure in the mass distribution of galaxies. In this study we investigate the power spectrum of dark matter perturbations in a population of 23 Hubble Space Telescope images of strong galaxy-galaxy lenses selected from The Sloan Lens ACS (SLACS) survey. We model the dark matter substructure as a Gaussian Random Field perturbation on a smooth lens mass potential, characterized by power-law statistics. We expand upon the previously developed machine learning framework to predict the power-law statistics by using a convolutional neural network (CNN) that accounts for both epistemic and aleatoric uncertainties. For the training sets, we use the smooth lens mass potentials and reconstructed source galaxies that have been previously modelled through traditional fits of analytical and shapelet profiles as a starting point. We train three CNNs with different training set: the first using standard data augmentation on the best-fitting reconstructed sources, the second using different reconstructed sources spaced throughout the posterior distribution, and the third using a combination of the two data sets. We apply the trained CNNs to the SLACS data and find agreement in their predictions. Our results suggest a significant substructure perturbation favoring a high frequency power spectrum across our lens population. © 2024, CC BY.

关键词： Convolutional neural networks

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PVA-based bioinks for 3D bioprinting: A comprehensive review of their applications in tissue engineering

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Bioprinting 2025年 49卷

作者： Johari, Narges Adabavazeh, Zary Baino, Francesco Materials Engineering Group Golpayegan College of Engineering Isfahan University of Technology Golpayegan Iran Ph.D. Program Graduate Institute of Precision Manufacturing National Chin-Yi University of Technology Taichung Taiwan Institute of Materials Physics and Engineering Department of Applied Science and Technology Politecnico di Torino Torino Italy

3D bioprinting is an innovative approach that overcomes the limitations of traditional methods for creating cell-laden biomaterials and constructs. It allows for the fabrication of complex and biologically active tissue structures. This review aims to provide a comprehensive evaluation of polyvinyl alcohol (PVA)-based bioinks within a 3D bioprinting framework. PVA-based bioinks exhibit remarkable properties, such as biocompatibility, biodegradability, and the ability to enhance cell growth and differentiation. These properties make them appropriate for many tissue engineering applications. The study evaluates the physicochemical and biological properties of PVA bioinks, including how they combine with other materials such as gelatin, chitin, chitosan, alginate, agarose, cellulose, κ-carrageenan, methacrylate, nanoparticles, mineral additives, carbon nanotubes, graphene oxide, and extracellular matrix components. Furthermore, this review evaluates the benefits of market availability and enhanced printing resolution, in addition to the challenges posed by complexity, dependency on support baths, and the risk of contamination. The objective of this review is to draw attention to the capabilities of PVA-based bioinks and provide guidelines for future research to improve the effectiveness of these materials in tissue engineering and regenerative medicine. © 2025 The Authors

关键词： Bioink Bioprinting Polyvinyl alcohol PVA-based bioinks

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Publisher's Note: "Theory of entangled two-photon emission/absorption [E2P-EA] between molecules" [J. Chem. Phys. 159, 074103 (2023)]

引用

The Journal of chemical physics 2023年第12期159卷 129901页

作者： Tse-Min Chiang George C Schatz Graduate Program in Applied Physics Northwestern University Evanston Illinois 60208 USA. Department of Chemistry and Graduate Program in Applied Physics Northwestern University 2145 Sheridan Road Evanston Illinois 60208 USA.

This article was published online on 15 August 2023 with an error in Eq. (11). Equation (11) appears correct as follows:M2≈eiϕℏ2∑s,m(μαs⋅θ↔(ωαs,R)⋅μem)(μβs⋅θ↔(ω

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Terahertz Time-Domain Spectroscopy for Probing DC Conductivity of Single-Layer Graphene

Terahertz Time-Domain Spectroscopy for Probing DC Conductivi...

引用

Western New York Image Processing Workshop (WNYIPW)

作者： Debamitra Chakraborty Declan Walden Jing Cheng Julia Wallace Kiryl A. Niherysh Andrei V. Felsharuk Donats Erts Ivan Komissarov Roman Sobolewski Materials Science Graduate Program University of Rochester Rochester New York USA Laboratory for Laser Energetics Rochester New York USA Department of Physics and Astronomy University of Rochester Rochester New York USA Department of Biomedical Engineering University of Rochester Rochester New York USA Institute of Chemical Physics University of Latvia Riga Latvia Department of Microtechnology and Nanoscience Chalmers University of Technology Gothenburg Sweden Department of Electrical and Computer Engineering University of Rochester Rochester New York USA

We report preliminary results of extracting electrical parameters like DC conductivity, mobility, and carrier concentration of single-layer graphene using Terahertz time-domain spectroscopy (THz-TDS) in transmission geometry. We utilize a simple Drude model and its extension, the Drude-Smith model, capable of accommodating charge carrier scattering by optical and acoustic phonons to describe the complex conductivity in graphene. We observed that a significant area of the sample scanned followed the Drude-Smith behavior, while at a few locations, the simple Drude behavior prevailed. We identified possible reasons that might contribute to this observation, like defects, the presence of polymer residue on the sample, or the sample strain. This research sheds new light on our understanding of graphene's electrical properties and lays the foundation for future investigations addressing defects and contaminants in graphene samples.

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Galactic cosmic ray variations associated with February 2022 "Starlink" magnetic storms observed with global networks of neutron monitors and muon detectors 38

Galactic cosmic ray variations associated with February 2022...

引用

38th International Cosmic Ray Conference, ICRC 2023

作者： Masuda, Y. Kato, C. Hayashi, Y. Kozai, M. Kataoka, R. Kadokura, A. Miyake, S. Iwai, K. Munakata, K. Mendonça, R.R.S. Echer, E. Dal Lago, A. Rockenbach, M. Schuch, N.J. Bageston, J.V. Braga, C.R. Al Jassar, H.K. Sharma, M.M. Duldig, M.L. Humble, J.E. Sabbah, I. Mangeard, P.-S. Kuwabara, T. Evenson, P. Department of Physics Shinshu University Matsumoto Nagano390-8621 Japan Polar Environment Data Science Center Joint Support-Center for Data Science Research Research Organization of Information and Systems Tachikawa Tokyo190-0014 Japan National Institute of Polar Research Tachikawa Tokyo190-8518 Japan Department of Polar Science School of Multidisciplinary Sciences The Graduate University for Advanced Studies SOKENDAI Tachikawa Tokyo190-8518 Japan Ibaraki College 866 Nakane Ibaraki-ken Hitachinaka-shi312-8508 Japan Institute for Space-Earth Environmental Research Nagoya University Aichi Nagoya464-8601 Japan São José dos Campos12227-010 Brazil Southern Space Coordination National Institute for Space Research P.O. Box 5021-97110-970 RS Santa Maria Brazil George Mason University 4400 University Drive FairfaxVA22030 United States Physics Department Kuwait University P.O. Box 5969 Safat13060 Kuwait School of Natural Sciences University of Tasmania HobartTAS7001 Australia Department of Laboratory Technology College of Technological Studies The Public Authority for Applied Education and Training Shuwaikh72853 Kuwait Bartol Research Institute Department of Physics and Astronomy University of Delaware 217 Sharp Laboratory NewarkDE19716 United States

A bunch of Starlink satellites was launched after the peak of the first magnetic storm at 18:13 (UT) on February 3, and 38 of the 49 satellites re-entered the atmosphere during the succeeding second moderate magnetic storms. A global network of the ground-based multidirectional muon detectors, the Global Muon Detector Network (GMDN), has been continuously monitoring the intensity of cosmic rays arriving at Earth. Neutron monitors (NMs) are also monitoring cosmic ray variations in different energy ranges. In this paper, we analyze the cosmic ray decreases associated with the interplanetary shock and coronal mass ejections (ICMEs) which caused the sequence of "Starlink" magnetic storms observed with GMDN and NMs. © Copyright owned by the author(s) under the terms of the Creative Commons.

关键词： Cosmic rays

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