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Ab initio Calculations of the Isotopic Dependence of Nuclear Clustering

Physical Review Letters 2017年第22期119卷 222505-222505页

作者： Serdar Elhatisari Evgeny Epelbaum Hermann Krebs Timo A. Lähde Dean Lee Ning Li Bing-nan Lu Ulf-G. Meißner Gautam Rupak Helmholtz-Institut für Strahlen- und Kernphysik and Bethe Center for Theoretical Physics Universität Bonn D-53115 Bonn Germany Department of Physics Karamanoglu Mehmetbey University Karaman 70100 Turkey Institut für Theoretische Physik II Ruhr-Universität Bochum D-44870 Bochum Germany Kavli Institute for Theoretical Physics University of California Santa Barbara California 93106-4030 USA Institute for Advanced Simulation Institut für Kernphysik and Jülich Center for Hadron Physics Forschungszentrum Jülich D-52425 Jülich Germany National Superconducting Cyclotron Laboratory Michigan State University East Lansing Michigan 48824 USA Department of Physics North Carolina State University Raleigh North Carolina 27695 USA JARA—High Performance Computing Forschungszentrum Jülich D-52425 Jülich Germany Department of Physics and Astronomy and HPC2 Center for Computational Sciences Mississippi State University Mississippi State Mississippi 39762 USA

Nuclear clustering describes the appearance of structures resembling smaller nuclei such as alpha particles (He4 nuclei) within the interior of a larger nucleus. In this Letter, we present lattice Monte Carlo calculations based on chiral effective field theory for the ground states of helium, beryllium, carbon, and oxygen isotopes. By computing model-independent measures that probe three- and four-nucleon correlations at short distances, we determine the shape of the alpha clusters and the entanglement of nucleons comprising each alpha cluster with the outside medium. We also introduce a new computational approach called the pinhole algorithm, which solves a long-standing deficiency of auxiliary-field Monte Carlo simulations in computing density correlations relative to the center of mass. We use the pinhole algorithm to determine the proton and neutron density distributions and the geometry of cluster correlations in C12, C14, and C16. The structural similarities among the carbon isotopes suggest that C14 and C16 have excitations analogous to the well-known Hoyle state resonance in C12.

关键词： Cluster models Nuclear charge distribution Nuclear forces Nuclear many-body theory Nuclear structure & decays Nucleon distribution Nucleon-nucleon interactions

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Correction: Anisotropy of CoII transferred to the Cr7Co polymetallic cluster via strong exchange interactions

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Chemical science 2018年第14期9卷 3607页

作者： Elena Garlatti Tatiana Guidi Alessandro Chiesa Simon Ansbro Michael L Baker Jacques Ollivier Hannu Mutka Grigore A Timco Inigo Vitorica-Yrezabal Eva Pavarini Paolo Santini Giuseppe Amoretti Richard E P Winpenny Stefano Carretta Dipartimento di Scienze Matematiche Fisiche e Informatiche Università di Parma I-43124 Parma Italy . Email: stefano.carretta@unipr.it. ISIS Facility Rutherford Appleton Laboratory OX11 0QX Didcot UK. Institute for Advanced Simulation Forschungszentrum Jülich 52425 Jülich Germany. The School of Chemistry Photon Science Institute The University of Manchester M13 9PL Manchester UK. Institut Laue-Langevin 71 Avenue des Martyrs CS 20156 Grenoble Cedex 9 F-38042 France. The School of Chemistry The University of Manchester at Harwell Didcot OX11 0FA UK. JARA High-Performance Computing RWTH Aachen University 52062 Aachen Germany.

[This corrects the article DOI: 10.1039/C8SC00163D.].

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Mobius domain-wall fermions on gradient-owed dynamical HISQ ensembles

arXiv

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arXiv 2017年

作者： Berkowitz, Evan Bouchard, Chris Chang, Chia Cheng Clark, M.A. Joo, Balint Kurth, Thorsten Monahan, Christopher Nicholson, Amy Orginos, Kostas Rinaldi, Enrico Vranas, Pavlos Walker-Loud, Andre Institut fur Kernphysik Institute for Advanced Simulation Forschungszentrum Julich Julich54245 Germany Nuclear and Chemical Sciences Division Lawrence Livermore National Laboratory LivermoreCA94550 United States School of Physics and Astronomy University of Glasgow GlasgowG128QQ United Kingdom Department of Physics College of William and Mary WilliamsburgVA23187 United States Nuclear Science Division Lawrence Berkeley National Laboratory BerkeleyCA94720 United States NVIDIA Corporation San Tomas Expressway Santa ClaraCA95050 United States Scientic Computing Group Thomas Jeerson National Accelerator Facility Newport NewsVA23606 United States NERSC Lawrence Berkeley National Laboratory BerkeleyCA94720 United States New High Energy Theory Center Department of Physics and Astronomy Rutgers State University of New Jersey PiscatawayNJ08854 United States Department of Physics University of California BerkeleyCA94720 United States Theory Center Thomas Jeerson National Accelerator Facility Newport NewsVA23606 United States RIKEN-BNL Research Center Brookhaven National Laboratory UptonNY11973 United States

We report on salient features of a mixed lattice QCD action using valence Mobius domain-wall fermions solved on the dynamical Nf = 2 + 1 + 1 HISQ ensembles generated by the MILC Collaboration. The approximate chiral symmetry properties of the valence fermions are shown to be significantly improved by utilizing the gradient-ow scheme to first smear the HISQ configurations. The greater numerical cost of the Mfiobius domain-wall inversions is mitigated by the highly efi-cient QUDA library optimized for NVIDIA GPU accelerated compute nodes. We have created an interface to this optimized QUDA solver in Chroma. We provide tuned parameters of the action and performance of QUDA using ensembles with the lattice spacings a *sime;f0.15, 0.12, 0,09g fm and pion masses mπ f310,220,130g MeV. We have additionally generated two new ensembles with a - 0:12 fm and mπ - f400,350g MeV. With a fixed ow-time of tgf = 1 in lattice units, the residual chiral symmetry breaking of the valence fermions is kept below 10% of the light quark mass on all ensembles, mres 0.1x ml, with moderate values of the fifth dimension L5 and a domain-wall height M5 ≥ 1.3. As a benchmark calculation, we perform a continuum, in finite volume, physical pion and kaon mass extrapolation of FK±=Fπ ± and demonstrate our results are independent of ow-time, and consistent with the FLAG determination of this quantity at the level of less than one standard deviation. Copyright © 2017, The Authors. All rights reserved.

关键词： Hadrons

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Direct and third-body mediated resonance energy transfer in dimensionally constrained nanostructures

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Physical Review B 2015年第3期92卷 035128-035128页

作者： Dilusha Weeraddana Malin Premaratne David L. Andrews []Advanced Computing and Simulation Laboratory (AχL) Department of Electrical and Computer Systems Engineering Monash University Clayton Victoria 3800 Australia

The process of resonance energy transfer (RET) in a nanostructure influenced by a vicinal, nonabsorbing third body is studied within the framework of molecular quantum electrodynamics. Direct RET and the influence of neighboring matter have been studied previously, mainly for molecules. However, a complete study or unified understanding of direct and indirect RET in nanostructures with different dimensionalities is still lacking. Therefore, there is a strong need for a complete theory that models RET for the cases of quantum wells, nanowires, and quantum dots. We construct a detailed picture of excitation energy transfer in nanostructures and how it is affected by another quantum object, which includes the derivation of quantum amplitudes based on second- and fourth-order time-dependent perturbation theories, and the derivation of transfer rates and distance dependencies, providing a complete picture and understanding of RET in nanostructures. The results of the derivations indicate that the dimensionality of the nanostructure determines the controllability of the RET rate. Furthermore, third-body mediation leads to a nonvanishing RET in the coupling of nanowire to nanowire and quantum dot to quantum dot.

关键词： FLUORESCENCE resonance energy transfer NANOSTRUCTURED materials QUANTUM electrodynamics MOLECULAR structure NANOWIRES ENERGY transfer

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An accurate calculation of the nucleon axial charge with lattice QCD

arXiv

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arXiv 2017年

作者： Berkowitz, Evan Brantley, David Bouchard, Chris Chang, Chia Cheng Clark, M.A. Garron, Nicolas Joo, Balint Kurth, Thorsten Monahan, Chris Monge-Camacho, Henry Nicholson, Amy Orginos, Kostas Rinaldi, Enrico Vranas, Pavlos Walker-Loud, Andre Institut fur Kernphysik Institute for Advanced Simulation Forschungszentrum Julich Julich54245 Germany Nuclear and Chemical Sciences Division Lawrence Livermore National Laboratory LivermoreCA94550 United States Department of Physics College of William and Mary WilliamsburgVA23187 United States Nuclear Science Division Lawrence Berkeley National Laboratory BerkeleyCA94720 United States School of Physics and Astronomy University of Glasgow GlasgowG12 8QQ United Kingdom NVIDIA Corporation 2701 San Tomas Expressway Santa ClaraCA95050 United States Theoretical Physics Division Department of Mathematical Sciences University of Liverpool LiverpoolL69 3BX United Kingdom Scientific Computing Group Thomas Jefferson National Accelerator Facility Newport NewsVA23606 United States NERSC Lawrence Berkeley National Laboratory BerkeleyCA94720 United States New High Energy Theory Center Department of Physics and Astronomy State University of New Jersey PiscatawayNJ08854 United States Department of Physics University of California BerkeleyCA94720 United States Theory Center Thomas Jefferson National Accelerator Facility Newport NewsVA23606 United States RIKEN-BNL Research Center Brookhaven National Laboratory UptonNY11973 United States

We report on a lattice QCD calculation of the nucleon axial charge, gA, using Mobius Domain-Wall fermions solved on the dynamical Nf = 2 + 1 + 1 HISQ ensembles after they are smeared using the gradient-ow algorithm. The calculation is performed with three pion masses, m ∼ {310;220;130} MeV. Three lattice spacings (a ∼ {0:15;0:12;0:09} fm) are used with the heaviest pion mass, while the coarsest two spacings are used on the middle pion mass and only the coarsest spacing is used with the near physical pion mass. On the m ∼ 220 MeV a ∼ 0:12 fm point, a dedicated volume study is performed with mL ∼ {3:22;4:29;5:36}. Using a new strategy motivated by the Feynman-Hellmann Theorem, we achieve a precise determination of gA with relatively low statistics, and demonstrable control over the excited state, continuum, infinite volume and chiral extrapolation systematic uncertainties, the latter of which remains the dominant uncertainty. Our FInal determination at 2.6% total uncertainty is gA = 1:278(21)(26), with the FIrst uncertainty including statistical and systematic uncertainties from FItting and the second including model selection systematics related to the chiral and continuum extrapolation. The largest reduction of the second uncertainty will come from a greater number of pion mass points as well as more precise lattice QCD results near the physical pion mass. Copyright © 2017, The Authors. All rights reserved.

关键词： Hadrons

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Ab initio calculations of the isotopic dependence of nuclear clustering

arXiv

引用

arXiv 2017年

作者： Elhatisari, Serdar Epelbaum, Evgeny Krebs, Hermann Lähde, Timo A. Lee, Dean Li, Ning Lu, Bing-nan Meißner, Ulf-G Rupak, Gautam Helmholtz-Institut für Strahlen- und Kernphysik and Bethe Center for Theoretical Physics Universität Bonn BonnD-53115 Germany Department of Physics Karamanoglu Mehmetbey University Karaman70100 Turkey Institut für Theoretische Physik II Ruhr-Universität Bochum BochumD-44870 Germany Kavli Institute for Theoretical Physics University of California Santa BarbaraCA93106-4030 United States Institute for Advanced Simulation Institut für Kernphysik Jülich Center for Hadron Physics Forschungszentrum Jülich JülichD-52425 Germany National Superconducting Cyclotron Laboratory Michigan State University MI48824 United States Department of Physics North Carolina State University RaleighNC27695 United States JARA - High Performance Computing Forschungszentrum Jülich JülichD-52425 Germany Department of Physics and Astronomy HPC2 Center for Computational Sciences Mississippi State University Mississippi StateMS39762 United States

Nuclear clustering describes the appearance of structures resembling smaller nuclei such as alpha particles (4He nuclei) within the interior of a larger nucleus. While clustering is important for several well-known examples [1–4], much remains to be discovered about the general nature of clustering in nuclei. In this letter we present lattice Monte Carlo calculations based on chiral effective field theory for the ground states of helium, beryllium, carbon, and oxygen isotopes. By computing model-independent measures that probe three- and four-nucleon correlations at short distances, we determine the shape of the alpha clusters and the entanglement of nucleons comprising each alpha cluster with the outside medium. We also introduce a new computational approach called the pinhole algorithm, which solves a long-standing deficiency of auxiliary-field Monte Carlo simulations in computing density correlations relative to the center of mass. We use the pinhole algorithm to determine the proton and neutron density distributions and the geometry of cluster correlations in 12C, 14C, and 16C. The structural similarities among the carbon isotopes suggest that 14C and 16C have excitations analogous to the well-known Hoyle state resonance in 12C [5, 6]. Copyright © 2017, The Authors. All rights reserved.

关键词： Ground state

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Radiative Cooling of the Thermally Isolated System in KAGRA Gravitational Wave Telescope

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Journal of Physics: Conference Series 2021年第1期1857卷

作者： T. Akutsu M. Ando K. Arai Y. Arai S. Araki A. Araya N. Aritomi Y. Aso S.-W. Bae Y.-B. Bae L. Baiotti R. Bajpai M. A. Barton K. Cannon E. Capocasa M.-L. Chan C.-S. Chen K.-H. Chen Y.-R. Chen H.-Y. Chu Y.-K. Chu S. Eguchi Y. Enomoto R. Flaminio Y. Fujii M. Fukunaga M. Fukushima G.-G. Ge A. Hagiwara S. Haino K. Hasegawa H. Hayakawa K. Hayama Y. Himemoto Y. Hiranuma N. Hirata E. Hirose Z. Hong B.-H. Hsieh G.-Z. Huang P.-W. Huang Y.-J. Huang B. Ikenoue S. Imam K. Inayoshi Y. Inoue K. Ioka Y. Itoh K. Izumi K. Jung P. Jung T. Kajita M. Kamiizumi N. Kanda G.-W. Kang K. Kawaguchi N. Kawai T. Kawasaki C. Kim J. Kim W. Kim Y.-M. Kim N. Kimura N. Kita H. Kitazawa Y. Kojima K. Kokeyama K. Komori A. K. H. Kong K. Kotake C. Kozakai R. Kozu R. Kumar J. Kume C.-M. Kuo H.-S. Kuo S. Kuroyanagi K. Kusayanagi K. Kwak H.-K. Lee H.-W. Lee R.-K. Lee M. Leonardi C.-Y. Lin F.-L. Lin L. C.-C. Lin G.-C. Liu L.-W. Luo M. Marchio Y. Michimura N. Mio O. Miyakawa A. Miyamoto Y. Miyazaki K. Miyo S. Miyoki S. Morisaki Y. Moriwaki K. Nagano S. Nagano K. Nakamura H. Nakano M. Nakano R. Nakashima T. Narikawa R. Negishi W.-T. Ni A. Nishizawa Y. Obuchi W. Ogaki J. J. Oh S.-H. Oh M. Ohashi N. Ohishi M. Ohkawa K. Okutomi K. Oohara C.-P. Ooi S. Oshino K.-C. Pan H.-F. Pang J. Park F. E. Peiia Arellano I. Pinto N. Sago S. Saito Y. Saito K. Sakai Y. Sakai Y. Sakuno S. Sato T. Sato T. Sawada T. Sekiguchi Y. Sekiguchi S. Shibagaki R. Shimizu T. Shimoda K. Shimode H. Shinkai T. Shishido A. Shoda K. Somiya E. J. Son H. Sotani R. Sugimoto T. Suzuki H. Tagoshi H. Takahashi R. Takahashi A. Takamori S. Takano H. Takeda M. Takeda H. Tanaka K. Tanaka T. Tanaka S. Tanioka E. N. Tapia San Martin S. Telada T. Tomaru Y. Tomigami T. Tomura F. Travasso L. Trozzo T. T. L. Tsang K. Tsubono S. Tsuchida T. Tsuzuki D. Tuyenbayev N. Uchikata T. Uchiyama A. Ueda T. Uehara K. Ueno G. Ueshima F. Uraguchi T. Ushiba M. H. P. M. van Putten H. Vocca J. Wang C.-M. Wu H.-C. Wu S.-R. Wu W.-R. Xu T. Yamada K. Yamamoto T. Yamamoto K. Yokogawa J. Yokoyama T. Yokozawa T. Yoshioka H. Yuzurihar National Astronomical Observatory of Japan (NAOJ) 2-21-1 Osawa Mitaka-City Tokyo 181-8588 Japan Research Center for the Early Universe (RESCEU) The University of Tokyo 7-3-1 Hongo Bunkyo-ku Tokyo 113-0033 Japan Department of Physics The University of Tokyo 7-3-1 Hongo Bunkyo-ku Tokyo 113-0033 Japan Institute for Cosmic Ray Research (ICRR) The University of Tokyo 5-1-5 Kashiwa-no-Ha Kashiwa-City Chiba 277-8582Japan Accelerator Laboratory High Energy Accelerator Research Organization (KEK) 1-1 OhoTsukuba-City Ibaraki 305-0801 Japan Earthquake Research Institute The University of Tokyo 1-1-1Yayoi Bunkyo-ku Tokyo 113-0032Japan Kamioka Branch National Astronomical Observatory of Japan (NAOJ) 238 Higashi-Mozumi Kamioka-cho Hida-City Gifu Pref. Japan The Graduate University for Advanced Studies (SOKENDAI) 2-21-1 Osawa Mitaka-City Tokyo 181-8588 Japan Korea Institute of Science and Technology Information (KISTI) 245 Daehak-ro Yuseong-gu Daejeon 34141 South Korea National Institute for Mathematical Sciences 70 Yuseong-daero 1689 beon-gil Yuseong-gu Daejeon 34047 South Korea Graduate School of Science Osaka University 1-1 Machikaneyama-cho Toyonaka-City Osaka560-0043 Japan School of High Energy Accelerator Science The Graduate University for Advanced Studies (SOKENDAI) 1-1 Oho Tsukuba-City Ibaraki 305-0801 Japan Institute for Gravitational Research University of Glasgow Kelvin Building G12 8QQ UK Department of Applied Physics Fukuoka University Fukuoka Jonan Nanakuma 814-0180 Japan Department of Physics Tamkang university No.151 Yingzhuan Rd. Danshui Dist. New Taipei-City 25137 Taiwan Department of Physics the Center for High Energy and High Field Physics National Central University No. 300 Zhongda Road Zhongyi District Taiyuan-City 320 Taiwan Institute of Astronomy National Tsing Hua University No. 101 Section 2 Kuang-Fu Road Hsinchu 30013 Taiwan Department of Physics National Tsing Hua University No. 101 Section 2

Radiative cooling of the thermally isolated system is investigated in KAGRA gravitational wave telescope. KAGRA is a laser interferometer-based detector and main mirrors constituting optical cavities are cool down to 20K to reduce noises caused by the thermal fluctuation. The mirror is suspended with the multi-stage pendulum to isolate any vibration. Therefore, this mirror suspension system has few heat links to reduce vibration injection. Thus, this system is mainly cooled down with thermal radiation. In order to understand the process of radiative cooling of the mirror, we analyzed cooling curve based on mass and specific heat. As a result, it was newly found that a cryogenic part called 'cryogenic duct-shield' seems to have large contribution in the beginning of the mirror cooling. This finding will help to design new cooling system for the next generation cryogenic gravitational wave detector.

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Hybrid phase-locked loop with fast locking time and low spur in a 0.18-μm CMOS process

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Chinese Physics B 2014年第7期23卷 748-753页

作者：朱思衡司黎明郭超史君宇朱卫仁 Beijing Key Laboratory of Millimeter Wave and Terahertz Technology Department of Electronic Engineering School of Information and ElectronicsBeijing Institute of Technology Advanced Computing and Simulation Laboratory (AχL) Department of Electrical and Computer Systems EngineeringMonash University

We propose a novel hybrid phase-locked loop （PLL） architecture for overcoming the trade-off between fast locking time and low spur. To reduce the settling time and meanwhile suppress the reference spurs, we employ a wide-band single-path PLL and a narrow-band dual-path PLL in a transient state and a steady state, respectively, by changing the loop bandwidth according to the gain of voltage controlled oscillator （VCO） and the resister of the loop filter. The hybrid PLL is implemented in a 0.18-μm complementary metal oxide semiconductor （CMOS） process with a total die area of 1.4×0.46 mm2. The measured results exhibit a reference spur level of lower than -73 dB with a reference frequency of 10 MHz and a settling time of 20 μs with 40 MHz frequency jump at 2 GHz. The total power consumption of the hybrid PLL is less than 27 mW with a supply voltage of 1.8 V.

关键词： phase-locked loop （PLL） fast locking time low spur complementary metal oxide semiconductor（CMOS）

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Design and Application of Plasmonic Nanoparticle Superlattices

Design and Application of Plasmonic Nanoparticle Superlattic...

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The 6th International Conference on Nanoscience and Technology, China 2015 (第六届中国国际纳米科学技术会议)

作者： Kae Jye Si Yi Chen Debabrata Sikdar Wenlong Cheng Department of Chemical Engineering Faculty of EngineeringMonash UniversityClayton 3800VictoriaAu State Key Laboratory of Bioelectronics Jiangsu Key Laboratory for Biomaterials and DevicesSchool of Advanced Computing and Simulation Laboratory(AχL) Department of Electrical and Computer Systems Engi

The modular assembly of plasmonic nanoparticles enables the creation of a new class of two-dimensional nanoparticle sheets with novel optical *** exciting advances,undeveloped issues still remain in terms of nanoparticle sheet design and potential ***,we present our research work which describes a simplistic and general polymer-based approach to assemble core-shell Au@Ag nanocubes into periodic nanoparticle arrays.

关键词： Plasmene Nanoparticle Superlattices Plasmonics Origami SERS Self-Assembly and supramolecules

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Hierarchical multiscale framework for materials modeling: Equation of state implementation and application to a Taylor anvil impact test of RDX

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AIP Conference Proceedings 2017年第1期1793卷

作者： Brian C. Barnes Carrie E. Spear Ken W. Leiter Richard Becker Jaroslaw Knap Martin Lísal John K. Brennan 1Energetic Materials Science Branch RDRL-WML-B US Army Research Laboratory Aberdeen Proving Ground MD 21005-5066 United States 2Maryland Advanced Research Computing Center Johns Hopkins University Baltimore MD United States 3Simulation Sciences Branch RDRL-CIH-C US Army Research Laboratory Aberdeen Proving Ground MD 21005-5066 United States 4Impact Physics Branch RDRL-WMP-C US Army Research Laboratory Aberdeen Proving Ground MD 21005-5066 United States 5Laboratory of Chemistry and Physics of Aerosols Institute of Chemical Process Fundamentals of the ASCR 165 02 Prague Czech Republic 6Department of Physics Faculty of Science J. E. Purkinje University 400 96 Ústí n. Lab. Czech Republic

In order to progress towards a materials-by-design capability, we present work on a challenge in continuum-scale modeling: the direct incorporation of complex physical processes in the constitutive evaluation. In this work, we use an adaptive scale-bridging computational framework executing in parallel in a heterogeneous computational environment to couple a fine-scale, particle-based model computing the equation of state (EOS) to the constitutive response in a finite-element multi-physics simulation. The EOS is obtained from high fidelity materials simulations performed via dissipative particle dynamics (DPD) methods. This scale-bridging framework is progress towards an innovation infrastructure that will be of great utility for systems in which essential aspects of material response are too complex to capture by closed form material models. The design, implementation, and performance of the scale-bridging framework are discussed. Also presented is a proof-of-concept Taylor anvil impact test of non-reacting 1,3,5-trinitrohexahydro-s-triazine (RDX).

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