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Frontispiece: Quantum Crystallography: Current Developments and Future Perspectives

Chemistry – A European Journal 2018年第43期24卷

作者： Alessandro Genoni Lukas Bučinský Nicolas Claiser Julia Contreras-García Birger Dittrich Paulina M. Dominiak Enrique Espinosa Carlo Gatti Paolo Giannozzi Jean-Michel Gillet Dylan Jayatilaka Piero Macchi Anders Ø. Madsen Lou Massa Chérif F. Matta Kenneth M. Merz Jr. Philip N. H. Nakashima Holger Ott Ulf Ryde Karlheinz Schwarz Marek Sierka Simon Grabowsky Université de Lorraine CNRS Laboratoire LPCT 1 Boulevard Arago F-57078 Metz France Institute of Physical Chemistry and Chemical Physics Slovak University of Technology FCHPT SUT Radlinského 9 SK-812 37 Bratislava Slovakia Université de Lorraine CNRS Laboratoire CRM2 Boulevard des Aiguillettes BP 70239 F-54506 Vandoeuvre-lès-Nancy France Sorbonne Universités UPMC Université Paris 06 CNRS Laboratoire de Chimie Théorique (LCT) 4 Place Jussieu F-75252 Paris Cedex 05 France Anorganische und Strukturchemie II Heinrich-Heine-Universität Düsseldorf Universitätsstraße 1 40225 Düsseldorf Germany Biological and Chemical Research Centre Department of Chemistry University of Warsaw ul. Żwirki i Wigury 101 02-089 Warszawa Poland CNR-ISTM Istituto di Scienze e Tecnologie Molecolari via Golgi 19 Milano I-20133 Italy Istituto Lombardo Accademia di Scienze e Lettere via Brera 28 20121 Milano Italy Department of Mathematics Computer Science and Physics University of Udine Via delle Scienze 208 I-33100 Udine Italy Structure Properties and Modeling of Solids Laboratory CentraleSupelec Paris-Saclay University 3 rue Joliot-Curie 91191 Gif-sur-Yvette France School of Molecular Sciences University of Western Australia 35 Stirling Highway Perth WA 6009 Australia Department of Chemistry and Biochemistry University of Bern Freiestrasse 3 CH-3012 Bern Switzerland Department of Pharmacy University of Copenhagen Universitetsparken 2 2100 Copenhagen Denmark Hunter College & the Ph.D. Program of the Graduate Center City University of New York New York USA Department of Chemistry and Physics Mount Saint Vincent University Halifax Nova Scotia B3M 2J6 Canada Department of Chemistry Dalhousie University Halifax Nova Scotia B3H 4J3 Canada Department of Chemistry Saint Mary's University Halifax Nova Scotia B3H 3C3 Canada Département de Chimie Université Laval Québec QC G1V 0A6 Canada Department of Chemistry and Department of Biochemistry and Molecular Biology Michigan Stat

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Principles of high–fidelity, high–density 3–d neural recording

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BMC Neuroscience 2014年第1期15卷 1-2页

作者： Caroline Moore-Kochlacs Nancy Kopell Justin P Kinney Ed S Boyden Jorg Scholvin Jacob G Bernstein Scott K Arfin Young Gyu Yoon Graduate Program for Neuroscience Boston University Boston MA 02215 USA McGovern Institute Massachusetts Institute of Technology MA 02139 USA Department of Mathematics and Statistics Boston University Boston MA 02215 USA Media Lab Massachusetts Institute of Technology MA 02139 USA Brain and Cognitive Science Massachusetts Institute of Technology MA 02139 USA Biological Engineering Massachusetts Institute of Technology MA 02139 USA Electrical Engineering and Computer Science Massachusetts Institute of Technology MA 02139 USA

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Near optimal feedback guidance design and the planar restricted three-body problem 24

Near optimal feedback guidance design and the planar restric...

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24th AAS/AIAA Space Flight Mechanics Meeting, 2014

作者： Dinius, Joseph Furfaro, Roberto Topputo, Francesco Selnick, Scott Program in Applied Mathematics University of Arizona 617 N Santa Rita Ave TucsonAZ85721 United States Department of Systems and Industrial Engineering University of Arizona 1127 E James E. Rogers Way TucsonAZ85721 United States Department of Aerospace and Mechanical Engineering University of Arizona 1130 N Mountain Ave TucsonAZ85721 United States Department of Aerospace Science and Technology Politecnico di Milano Via La Masa 34 Milan20156 Italy

ISBN: (纸本)9780877036111

In this paper, we present the application of the ZEM/ZEV guidance algorithm to the planar restricted three-body problem (PR3BP). The ZEM/ZEV guidance law as a feedback guidance strategy is presented and applied to the PR3BP. The fuel optimal solution to the PR3BP for a transfer from GTO to L1 in the Earth-Moon system is presented as a point for comparison, showing the near optimality of the closed-loop guidance approach. Challenges of the approach and strategies for implementation in spacecraft mission design are discussed.

关键词： Feedback

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Avian photoreceptor patterns represent a disordered hyperuniform solution to a multiscale packing problem

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Physical Review E 2014年第2期89卷 022721-022721页

作者： Yang Jiao Timothy Lau Haralampos Hatzikirou Michael Meyer-Hermann Joseph C. Corbo Salvatore Torquato Princeton Institute of the Science and Technology of Materials Princeton University Princeton New Jersey 08540 USA Materials Science and Engineering Arizona State University Tempe Arizona 85287 USA Department of Pathology and Immunology Washington University School of Medicine St. Louis Missouri 63110 USA Department of Systems Immunology Helmholtz Centre for Infection Research Braunschweig Germany Center for Advancing Electronics Dresden TU Dresden 01062 Dresden Germany Department of Chemistry Department of Physics Program in Computational and Applied Mathematics Princeton University Princeton New Jersey 08544 USA

Optimal spatial sampling of light rigorously requires that identical photoreceptors be arranged in perfectly regular arrays in two dimensions. Examples of such perfect arrays in nature include the compound eyes of insects and the nearly crystalline photoreceptor patterns of some fish and reptiles. Birds are highly visual animals with five different cone photoreceptor subtypes, yet their photoreceptor patterns are not perfectly regular. By analyzing the chicken cone photoreceptor system consisting of five different cell types using a variety of sensitive microstructural descriptors, we find that the disordered photoreceptor patterns are “hyperuniform” (exhibiting vanishing infinite-wavelength density fluctuations), a property that had heretofore been identified in a unique subset of physical systems, but had never been observed in any living organism. Remarkably, the patterns of both the total population and the individual cell types are simultaneously hyperuniform. We term such patterns “multihyperuniform” because multiple distinct subsets of the overall point pattern are themselves hyperuniform. We have devised a unique multiscale cell packing model in two dimensions that suggests that photoreceptor types interact with both short- and long-ranged repulsive forces and that the resultant competition between the types gives rise to the aforementioned singular spatial features characterizing the system, including multihyperuniformity. These findings suggest that a disordered hyperuniform pattern may represent the most uniform sampling arrangement attainable in the avian system, given intrinsic packing constraints within the photoreceptor epithelium. In addition, they show how fundamental physical constraints can change the course of a biological optimization process. Our results suggest that multihyperuniform disordered structures have implications for the design of materials with novel physical properties and therefore may represent a fruitful area for future research

关键词： PHOTORECEPTORS ARRAY processing BIRDS MULTISCALE modeling SAMPLING (Signal processing) EPITHELIUM

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Fibonacci-Based Hardware Post-Processing for Non-Autonomous Signum Hyperchaotic System

Fibonacci-Based Hardware Post-Processing for Non-Autonomous ...

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International Conference on IT Convergence and Security (ICITCS)

作者： Abhinav S. Mansingka Mohamed L. Barakat M. Affan Zidan Ahmed G. Radwan Khaled N. Salama Electrical Engineering Program King Abdullah University of Science and Technology Thuwal KSA Applied Engineering Mathematics Cairo University Egypt

This paper presents a hardware implementation of a robust non-autonomous hyperchaotic-based PRNG driven by a 256-bit LFSR. The original chaotic output is post-processed using a novel technique based on the Fibonacci series, bitwise XOR, rotation, and feedback. The proposed post-processing technique preserves the throughput of the system and enhances the randomness in the output which is verified by successfully passing all NIST SP. 800-22 tests. The system is realized on a Xilinx Virtex 4 FPGA achieving throughput up to 13.165 Gbits/s for 16-bit bus-width surpassing previously reported CB-PRNGs.

关键词： Generators Hardware Throughput NIST Field programmable gate arrays Chaotic communication

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11th German Conference on Chemoinformatics (GCC 2015) Abstracts

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JOURNAL OF CHEMINFORMATICS 2016年第SUPPL 1期8卷 1-27页

作者： [Anonymous] GDCh-CIC Division Associated Board Member Beilstein-Institut zur Förderung der Chemischen Wissenschaften Trakehner Str. 7-9 60487 Frankfurt Germany. ufechner@beilstein-institut.de. Division Medicinal Chemistry Amsterdam Institute for Molecules Medicines and Systems (AIMMS) VU University Amsterdam The Netherlands. Centre for Bioinformatics Uni Hamburg Bundesstr. 43 20146 Hamburg Germany. Sanofi-Aventis Deutschland GmbH 65926 Frankfurt am Main Germany. stefan.guessregen@***. Sanofi-Aventis Deutschland GmbH 65926 Frankfurt am Main Germany. GlaxoSmithKline Stevenage SG1 2NY UK. nicola.j.richmond@***. Discngine Paris 75011 France. Organisch-Chemisches Institut Westfälische Wilhelms-Universität Münster Germany. marwin.segler@wwu.de. Organisch-Chemisches Institut Westfälische Wilhelms-Universität Münster Germany. Bundeskriminalamt Wiesbaden Central Analytics II 65173 Wiesbaden Germany. Department of Chemistry and Biochemistry University of California Santa Barbara CA 93111 USA. shea@chem.ucsb.edu. Department of Chemistry and Biochemistry University of California Santa Barbara CA 93111 USA. Chemistry Department Ludwig-Maximilians-Universität München Butenandtstr. 7 81377 Munich Germany. Inorganic Chemistry and Center for Nanointegration University of Duisburg-Essen Essen Germany. CAM-D Technologies Essen Germany. Institute for Bioinformatics and Chemoinformatics Westphalian University of Applied Sciences Recklinghausen Germany. Institute for Bioinformatics and Chemoinformatics Westphalian University of Applied Sciences Recklinghausen Germany. achim.zielesny@w-hs.de. Leiden University Leiden Netherlands. j.fraaije@chem.leidenuniv.nl. Culgi BV Berlin Germany. Physikalische Chemie III TU Dortmund 44227 Dortmund Germany. stefan.kast@tu-dortmund.de. Centre for Molecular Informatics Department of Chemistry University of Cambridge Lensfield Road Cambridge CB2 1EW United Kingdom. kcb27@cam.ac.uk. Centre for Molecular Informatics Department of Chemistry

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On the short-term predictability of fully digital chaotic oscillators for pseudo-random number generation

On the short-term predictability of fully digital chaotic os...

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IEEE International Conference on Electronics, Circuits and Systems (ICECS)

作者： A. G. Radwan Abhinav S. Mansingka M. Affan Zidan K. N. Salama Engineering Mathematics Department Cairo University Giza Egypt Electrical Engineering Program King Abdullah University of Science and Technology (KAUST) Thuwal Saudi Arabia

This paper presents a digital implementation of a 3rd order chaotic system using the Euler approximation. Short-term predictability is studied in relation to system precision, Euler step size and attractor size and optimal parameters for maximum performance are derived. Defective bits from the native chaotic output are neglected and the remaining pass the NIST SP. 800-22 tests without post-processing. The resulting optimized pseudorandom number generator has throughput up to 17.60 Gbits/s for a 64-bit design experimentally verified on a Xilinx Virtex 4 FPGA with logic utilization less than 1.85%.

关键词： Nickel Chaotic communication Generators Throughput Niobium Field programmable gate arrays

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Symmetry breaking in optimal timing of traffic signals on an idealized two-way street

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Physical Review E 2013年第3期88卷 032801-032801页

作者： Mark J. Panaggio Bertand J. Ottino-Löffler Peiguang Hu Daniel M. Abrams Department of Engineering Sciences and Applied Mathematics Northwestern University Evanston Illinois 60208 USA Department of Mathematics Institute of Technology Pasadena California 91126 USA Engineering Science Program National University of Singapore Singapore Northwestern Institute on Complex Systems Northwestern University Evanston Illinois 60208 USA

Simple physical models based on fluid mechanics have long been used to understand the flow of vehicular traffic on freeways; analytically tractable models of flow on an urban grid, however, have not been as extensively explored. In an ideal world, traffic signals would be timed such that consecutive lights turned green just as vehicles arrived, eliminating the need to stop at each block. Unfortunately, this “green-wave” scenario is generally unworkable due to frustration imposed by competing demands of traffic moving in different directions. Until now this has typically been resolved by numerical simulation and optimization. Here, we develop a theory for the flow in an idealized system consisting of a long two-way road with periodic intersections. We show that optimal signal timing can be understood analytically and that there are counterintuitive asymmetric solutions to this signal coordination problem. We further explore how these theoretical solutions degrade as traffic conditions vary and automotive density increases.

关键词： Symmetry two-way street Frustration Bidirectional Traffic flow Traffic signals Flow Street Symmetry physical models Traffic Signal timing fluid mechanics

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Impact response measurement of contact lenses 5

Impact response measurement of contact lenses

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5th International Conference on Advanced Micro-Device engineering, AMDE 2013

作者： Watanabe, Kazuhide Miyashita, Naoki Bin, Du Hong Irisa, Kyohei Takita, Akihiro Yamaguchi, Takao Carcasona, Edwin Mitatha, Somsak Fujii, Yusaku Education Program of Electronics and Infomatics Mathematics and Physics Gunma University 1-5-1 Tenjin-cho Kiryu Gunma376-8515 Japan Department of Electronics Faculty of Engineering Gunma University 1-5-1 Tenjin-cho Kiryu Gunma376-8515 Japan Education Program of Mechanical Science and Technology School of Science and Technology Gunma University 1-5-1 Tenjin-cho Kiryu Gunma376-8515 Japan Department of Electronics Graduate School of Engineering Gunma University 1-5-1 Tenjin-cho Kiryu376-8515 Japan Division of Mechanical Science and Technology Faculty of Science and Technology Gunma University 1-5-1 Tenjin-cho Kiryu Gunma376-8515 Japan Department of Mechanical Engineering University of San Carlos Cebu City230-0100 Philippines Hybrid Computing Research Laboratory School of Computer Engineering Faculty of Engineering King Mongkut's Institute of Technology Ladkrabang Chalongkrung Road Bangkok Thailand

ISBN: (纸本)9783038354659

Impact response of contact lenses is measured using the Levitation Mass Method (LMM). In the LMM, a small mass collides with contact lenses and the impact force is measured with high accuracy as the inertial force of the moving part. A pneumatic linear bearing is used to achieve linear motion with sufficiently small friction acting on the moving part. Hysteresis loop and consumed energy as mechanical characteristics of contact lenses are also calculated.. © (2015) Trans Tech Publications, Switzerland.

关键词： Contact lenses

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Optimization of a z-source DC circuit breaker

Optimization of a z-source DC circuit breaker

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2013 5th IEEE Electric Ship Technologies Symposium, ESTS 2013

作者： Prempraneerach, P. Angle, M.G. Kirtley Jr., J.L. Karniadakis, G.E. Chryssostomidis, C. Mechanical Engineering Department Rajamangala University of Technology Thunyaburi Pathumthani 12110 Thailand Electrical Engineering and Computer Science Department Research Laboratory for Electronics MIT Cambridge MA 02139 United States Division of Applied Mathematics Brown University Providence RI 02912 United States MIT Sea Grant College Program Department of Mechanical Engineering MIT Cambridge MA 02138 United States

ISBN: (纸本)9781467352437

DC faults may cause severe disruptions in continuity of service to vital loads in a shipboard integrated power system, hence detection, isolation, and protection against such faults must be incorporated in both medium-voltage DC (MVDC) and low-voltage DC (LVDC) systems. Here we consider the effectiveness of existing z-source breakers and propose several new designs more appropriate for fault detection in MVDC and LVDC systems. In particular, we perform an optimization study that aims to minimize dissipation and weight and we identify the key parameters for use in MVDC and LVDC systems. Preliminary verification and validation studies are also included. © 2013 IEEE.

关键词： Electric circuit breakers

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