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Multiplexed Metasurfaces: Wavevector and Frequency Multiplexing Performed by a Spin-decoupled Multichannel Metasurface (Adv. Mater. Technol. 1/2020)

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Advanced Materials Technologies 2020年第1期5卷

作者： He-Xiu Xu Guangwei Hu Menghua Jiang Shiwei Tang Yanzhao Wang Chaohui Wang Yongjun Huang Xiaohui ling Haiwen liu Jiafeng Zhou Department of Electronic Science and Technology Air force Engineering University Xi'an 710051 China Department of Electrical and Computer Engineering National University of Singapore Singapore 117583 Singapore Department of Physics Faculty of Science Ningbo University Ningbo 315211 China School of Information and Communication Engineering University of Electronic Science and Technology Chengdu 611731 China College of Physics and Electronic Engineering Hengyang Normal University Hengyang 421002 China School of Electronic and Information Engineering Xi'an Jiaotong University Xi'an 710049 China Department of Electrical Engineering and Electronics University of Liverpool Liverpool L69 3GJ UK

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Computational characterizations of dimethyl-N,N′-[(ethyne-1,2-di-yl)bis-(1,4-phenyl-ene carbon-yl)]bis-(l-alaninate) crystals

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AIP Conference Proceedings 2020年第1期2270卷

作者： K. Senthil Kannan P. Thamarikannan K. Venkatachalam V. Kalaipoonguzhali S. Karthikeyan 1R&D Edayathangudy G.S Pillay Arts & Science College Nagapattinam 611002 TN India 2Dept. of Computer Science and Engineering E.G.S Pillay Engineering College Nagapattinam 611002 TN India 3Department of Analytical Chemistry University of Madras Guindy campus Chennai-25 Tamil Nadu India 4Dept. of Electronics and Communication Engineering E.G.S Pillay Engineering College Nagapattinam 611002 TN India 5Department of Chemistry Vivekanandha College of Technology for Women Namakkal-637205 TN India

dlA crystals are of NlO type and are having wide scope of uses in opto-electronic and stage coordinating and frequency doubling and which have Empirical formula as C24H24N2O6, Crystal system is Monoclinic, Space group is P21 and lattice parameters are a as 4.9410 Å, b as 39.0151 Å, c as 5.8446 Å, as 100.91° and Volume is 1126.68 Å3 and crystallite size is 0.25*0.16*0.25 mm3. As the crystals of dlA are of NlO of the second order, it can be having the effect of impact of dFT are analyzed and Alaninate derivatives are used for bio applications and here dlA are used for anti-diabetic activities.

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A Comparative Study of the Ground State Transitions of CO and [C I] as Molecular Gas Tracers at High Redshift

arXiv

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arXiv 2024年

作者： Castillo, Marta Frias Rybak, Matus Hodge, Jacqueline A. van der Werf, Paul Smail, Ian Butterworth, Joshua Jansen, Jasper Topkaras, Theodoros Chen, Chian-Chou Chapman, Scott C. Weiss, Axel Algera, Hiddo Birkin, Jack E. da Cunha, Elisabete Chen, Jianhang dannerbauer, Helmut Jiménez-Andrade, E.F. Ikarashi, Soh liao, Cheng-lin Murphy, Eric J. Swinbank, A.M. Walter, Fabian Rivera, Gabriela Calistro Ivison, R.J. del lagos, Claudia P. Leiden Observatory Leiden University P.O. Box 9513 Leiden2300 RA Netherlands Faculty of Electrical Engineering Mathematics and Computer Science Delft University of Technology Mekelweg 4 Delft2628 CD Netherlands SRON - Netherlands Institute for Space Research Niels Bohrweg 4 Leiden2333 CA Netherlands Centre for Extragalactic Astronomy Department of Physics Durham University South Road DurhamDH1 3LE United Kingdom I. Physikalisches Institut Universität zu Köln Zülpicher Str. 77 Köln50937 Germany No.1 Section 4 Roosevelt Road Taipei10617 Taiwan Department of Physics and Atmospheric Science Dalhousie University Halifax HalifaxNSB3H 3J5 Canada Max Planck Institut für Radioastronomie Auf dem Hügel 69 BonnD-53121 Germany Hiroshima Astrophysical Science Center Hiroshima University 1-3-1 Kagamiyama Hiroshima Higashi-Hiroshima739-8526 Japan National Astronomical Observatory of Japan 2-21-1 Osawa Mitaka Tokyo Japan Department of Physics and Astronomy Texas A&M University 4242 TAMU College StationTX77843-4242 United States George P. and Cynthia Woods Mitchell Institute for Fundamental Physics and Astronomy Texas A&M University 4242 TAMU College StationTX77843-4242 United States International Centre for Radio Astronomy Research University of Western Australia 35 Stirling Hwy CrawleyWA6009 Australia Australia Karl-Schwarzschild-Straße 2 Garching bei München85748 Germany Tenerife La LagunaE-38205 Spain Dpto. Astrofísica Universidad de la Laguna Tenerife La LagunaE-38206 Spain Instituto de Radioastronomía y Astrofísica Universidad Nacional Autónoma de México Antigua Carretera a Pátzcuaro # 8701 Ex-Hda. San José de la Huerta Michoacán MoreliaC.P. 58089 Mexico Department of Physics General Studies College of Engineering Nihon University 1 Nakagawara Tokusada Tamuramachi Fukushima Koriyama963-8642 Japan National Astronomical Observatory of Japan 2-21-1 Osawa Mitaka Tokyo181-8588 Japan Graduate Institute of Astrophysics Na

The CO(1-0) and [C I](1-0) emission lines are well-established tracers of cold molecular gas mass in local galaxies. At high redshift, where the interstellar medium (ISM) is likely to be denser, there have been limited direct comparisons of both ground state transitions. Here we present a study of CO(1-0) and [C I](1-0) emission in a sample of 20 unlensed dusty, star-forming galaxies at z = 2 − 5. The CO(1-0)/[C I](1-0) ratio is constant up to at least z = 5, supporting the use of [CI](1-0) as a gas mass tracer. PdR modelling of the available data indicates a median H2 density of log(n [cm−3]) = 4.7 ± 0.2, and UV radiation field log(GUV [G0]) = 3.2 ± 0.2. We use the CO(1-0), [C I](1-0) and 3mm dust continuum measurements to cross-calibrate the respective gas mass conversion factors, finding no dependence of these factors on either redshift or infrared luminosity. Assuming a variable CO conversion factor then implies [C I] and dust conversion factors that differ from canonically assumed values but are consistent with the solar/super-solar metallicities expected for our sources. Radiative transfer modelling shows that the warmer CMB at high redshift can significantly affect the [C I] as well as CO emission, which can change the derived molecular gas masses by up to 70% for the coldest kinetic gas temperatures expected. Nevertheless, we show that the magnitude of the effect on the ratio of the tracers is within the known scatter of the l′CO − l′[CI] relation. Further determining the absolute decrease of individual line intensities will require well-sampled spectral line energy distributions (SlEds) to model the gas excitation conditions in more detail. Copyright © 2024, The Authors. All rights reserved.

关键词： Ground state

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Multi-Frequency GNSS dielectric Resonator Antenna with In-Band Filtering

Multi-Frequency GNSS Dielectric Resonator Antenna with In-Ba...

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European Conference on Antennas and Propagation

作者： Slobodan Jovic Michel Clenet Yahia M. M. Anta Defence R&D Canada - Ottawa Research Centre Ottawa Canada Royal Military College of Canada Electrical and Computer Engineering Dept. Kingston Canada Royal Military College of Canada Electrical and Computer Engineering Dept. Kingston Canada

ISBN: (纸本)9781785618154;9781785618161

This paper presents a novel multi-frequency GNSS antenna based on a dielectric resonator (dR) with in-band filtering. The antenna is based on a conventional hollow cylinder dR with four feeding ports. It introduces a novel concept so called "decoupling network". The "decoupling network" is an engineered surface conformal to the inner wall of the dR and it contributes to the antenna realized gain, impedance bandwidth and provides narrow-band notch-filter like suppression of antenna radiation between 1.34 and 1.41 GHz. In case of the GNSS antennas, the radiation suppression between 1.3 and 1.56 GHz is desirable to reject in-band interference from the l-band satellite and terrestrial communication signals. The "decoupling network" also contributes to the coupling reduction between the feeding ports.

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Theoretical and Experimental Study of Coiled Finned tube Heat exchanger for Helium liquefaction Plant

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IOP Conference Series: Materials Science and engineering 2019年第1期502卷

作者： S M Mehta R M damle K P desai H B Naik Mechanical Engineering Department L.D. College of Engineering Ahmedabad. Faculty of Technology CEPT University Ahmedabad. Mechanical Engineering Department SVNIT Surat.

The performance of a liquefier is governed by the effectiveness of its heat exchangers. Coiled finned tube heat exchangers are used in medium capacity helium liquefiers based on Collins cycle. Experimental and theoretical analysis of the first heat exchanger in helium liquefaction cycle is presented in this work. The objective of this study is to design, optimize and test the heat exchanger to achieve the desired effectiveness and therefore the drop in the temperature of the gas on the hot side. A transient numerical model is employed to optimize the geometrical configuration and operating parameters of the coiled finned tube heat exchanger. Effect of variable physical properties, axial conduction and radiative heat transfer of the outer shell is also considered. The numerical model is validated with experimental results found in open literature. The numerical model is then used for deriving the optimum geometrical configuration of the coiled heat exchanger. Experimental observations from the tests carried out on a fabricated prototype are also reported in this work. Finally, results of the numerical model are also compared with the experimental results obtained in this study.

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Investigating the Material Composition and degradation of Wall Paintings at Müstair Monastery Using a Mobile Multi-Spectroscopic System

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Photonics 2025年第5期12卷 489-489页

作者： Xueshi Bai Patrick Cassitti Aude Brebant didier Brissaud duixiong Sun Yaopeng Yin Vincent detalle Centre de Recherche et de Restauration des Musées de France (C2RMF) 14 Quai François-Mitterrand 75001 Paris France Archaeological Service Canton of Grisons CH-7000 Chur Switzerland Département Génie Electrique Institut Sciences et Technique CY Cergy-Paris Université 5 Mail Gay Lussac 95031 Neuville sur Oise France Laboratoire de Recherche des Monuments Historiques 29 Rue de Paris 77420 Champs-sur-Marne France Key Laboratory of Atomic and Molecular Physics & Functional Materials of Gansu Province College of Physics and Electronic Engineering Northwest Normal University Lanzhou 730070 China National Research Center for Conservation of Ancient Wall Paintings and Earthen Sites Conservation Institute Dunhuang Academy Dunhuang 736200 China Systèmes et Applications des Technologies de l’Information et de l’Energie (SATIE) CY Cergy-Paris Université CNRS UMR 8029 5 Mail Gay Lussac 95031 Neuville sur Oise France

The conservation of cultural heritage requires advanced analytical tools to assess historic materials. In the context of the IPERION-CH project, a mobile multi-spectroscopic characterisation system for the analysis of cultural heritage materials, designated SYSPECTRAl, has been developed. This system integrates laser-Induced Breakdown Spectroscopy (lIBS), laser-Induced Fluorescence, Raman spectroscopy, and reflectance spectroscopy. The first application of SYSPECTRAl in a real-world setting was carried out at Müstair Monastery (UNESCO World Heritage Site since 1983) for wall paintings. In this study, stratigraphic analysis using lIBS revealed lead- and iron-based pigments in black and red hues, suggesting pigment degradation and restoration interventions. The presence of titanium in white hues indicated possible retouching. Furthermore, the presence of Egyptian blue in blue hues was identified through a combination of elemental and reflectance spectral analysis, underscoring the potential of SYSPECTRAl for heritage conservation. This approach offers comprehensive material characterization with minimal impact, a finding that is of particular significance in the context of heritage conservation. The subsequent phase of research will extend the application of SYSPECTRAl to a wider range of heritage sites, with the objective of enhancing the spectral databases and refining the analytical techniques for the purpose of improving cultural heritage conservation.

关键词： lIBS mural painting MOlAB stratigraphic analysis Müstair Monastery

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Test suite reduction based on traceability matrix with association rule mining technique

Test suite reduction based on traceability matrix with assoc...

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作者： Subashini, B. Jeyamala, d. Department of Computer Applications K.L.N. College of Engineering Sivagangai Tamil Nadu630612 India Department of Computer Applications Thiagarajar College of Engineering Madurai Tamil Nadu625005 India

In programming development life cycle, testing assumes a significant part, which enhances the quality, dependability, and execution of the framework. For testing the functionality of software or program, test suites, an accumulation of test cases are created and it verifies software which operates in conformance with the requirement specification. Since large amounts of test cases are generated, it may be redundant. In this paper, the test suite can be drastically diminished by fusing data mining, philosophy of association rule mining technique in software testing. The proposed technique will reduce the redundant and irrelevant test suite in testing the software. It results in a healthier test suite, which saves time, effort, cost and results in better coverage analysis and efficiency. lastly, this paper contrasts the proposed calculation and the existing one utilising case study analyses. Copyright © 2017 Inderscience Enterprises ltd.

关键词： Software testing

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Experimental investigation and optimization of direct metal laser sintering process for shrinkage rate using Cl50WS material

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Materials Today: Proceedings 2018年第9期5卷 19126-19135页

作者： Hiren M. Gajera Komal G. dave C. U. Shah University Surendrangar Gujarat 363020 India Mechancial Engineering Depatment L.D.College of Enigneering Ahmdebad Gujarat380009 India

In today’s competitive era, the quality of the die or mould is very significant for tooling industries which is highly influencing the final product. The dimensional inaccuracy of die due to shrinkage rate of parts lead to increase defective parts, and shrinkage can be minimizing by controlling of proper design parameter of process. Hence, the aims of this study to optimize the process parameter of dMlS process for Cl50WS die material. In this study, analysis and optimization of four process parameters namely laser power, layer thickness, scan speed and hatch distance, and take shrinkage rate as response. Result shows that optimum process parameter (laser power 129.814 Watt, scan speed 554.439 mm/s, layer thickness 0.05 mm and hatch distance 0.01 mm) gives acceptable range of error (delta H, delta W and delta l are 6.42%, 8.29 % and 10.72% respectively).

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Sensor noise in lISA Pathfinder: laser frequency noise and its coupling to the optical test mass readout

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Physical Review d 2024年第4期109卷 042003-042003页

作者： M. Armano H. Audley J. Baird P. Binetruy M. Born d. Bortoluzzi N. Brandt E. Castelli A. Cavalleri A. Cesarini A. M. Cruise K. danzmann M. de deus Silva I. diepholz G. dixon R. dolesi l. Ferraioli V. Ferroni E. d. Fitzsimons R. Flatscher M. Freschi A. García R. Gerndt l. Gesa d. Giardini F. Gibert R. Giusteri C. Grimani J. Grzymisch F. Guzman I. Harrison M.-S. Hartig G. Hechenblaikner G. Heinzel M. Hewitson d. Hollington d. Hoyland M. Hueller H. Inchauspé O. Jennrich P. Jetzer U. Johann B. Johlander N. Karnesis B. Kaune C. J. Killow N. Korsakova J. A. lobo J. P. lópez-Zaragoza R. Maarschalkerweerd d. Mance V. Martín l. Martin-Polo F. Martin-Porqueras J. Martino P. W. McNamara J. Mendes l. Mendes N. Meshksar A. Monsky M. Nofrarias S. Paczkowski M. Perreur-lloyd A. Petiteau E. Plagnol J. Ramos-Castro J. Reiche F. Rivas d. I. Robertson G. Russano J. Sanjuan J. Slutsky C. F. Sopuerta F. Steier T. Sumner d. Texier J. I. Thorpe d. Vetrugno S. Vitale V. Wand G. Wanner H. Ward P. J. Wass W. J. Weber l. Wissel A. Wittchen P. Zweifel European Space Technology Centre European Space Agency Keplerlaan 1 2200 AG Noordwijk The Netherlands Max Planck Institute for Gravitational Physics (Albert-Einstein-Institut) 30167 Hannover Germany Leibniz Universität Hannover 30167 Hannover Germany Université Paris Cité CNRS Astroparticule et Cosmologie F-75013 Paris France Department of Industrial Engineering University of Trento via Sommarive 9 38123 Trento and Trento Institute for Fundamental Physics and Application/INFN Airbus Defence and Space Claude-Dornier-Strasse 88090 Immenstaad Germany Dipartimento di Fisica Università di Trento and Trento Institute for Fundamental Physics and Application/INFN 38123 Povo Trento Italy Istituto di Fotonica e Nanotecnologie CNR-Fondazione Bruno Kessler I-38123 Povo Trento Italy DISPEA Università di Urbino Carlo Bo Via S. Chiara 27 61029 Urbino/INFN Italy The School of Physics and Astronomy University of Birmingham Birmingham United Kingdom European Space Astronomy Centre European Space Agency Villanueva de la Cañada 28692 Madrid Spain Institut für Geophysik ETH Zürich Sonneggstrasse 5 CH-8092 Zürich Switzerland The UK Astronomy Technology Centre Royal Observatory Edinburgh Blackford Hill Edinburgh EH9 3HJ United Kingdom City University of Applied Sciences Flughafenallee 10 28199 Bremen Germany Institut de Ciències de l’Espai (ICE CSIC) Campus UAB Carrer de Can Magrans s/n 08193 Cerdanyola del Vallès Spain Institut d’Estudis Espacials de Catalunya (IEEC) C/ Gran Capità 2-4 08034 Barcelona Spain isardSAT SL Marie Curie 8-14 08042 Barcelona Catalonia Spain Texas A&M University 701 H.R. Bright Bldg College Station Texas 77843-3141 USA European Space Operations Centre European Space Agency 64293 Darmstadt Germany High Energy Physics Group Physics Department Imperial College London Blackett Laboratory Prince Consort Road London SW7 2BW United Kingdom Physik Institut Universität Zürich Winterthurerstrasse 190 CH-8057 Zürich Switzerland SUPA Institu

The lISA Pathfinder (lPF) mission successfully demonstrated the feasibility of the technology needed for the future space borne gravitational wave observatory lISA. A key subsystem under study was the laser interferometer, which measured the changes in relative distance in between two test masses (TMs). It achieved a sensitivity of 32.0−1.7+2.4 fm/Hz, which was significantly better than the prelaunch tests. This improved performance allowed direct observation of the influence of laser frequency noise in the readout. The differences in optical path lengths between the measurement and reference beams in the individual interferometers of our setup determined the level of this undesired readout noise. Here, we discuss the dedicated experiments performed on lPF to measure these differences with high precision. We reached differences in path length difference between (368±5) μm and (329.6±0.9) μm which are significantly below the required level of 1 mm or 1000 μm. These results are an important contribution to our understanding of the overall sensor performance. Moreover, we observed varying levels of laser frequency noise over the course of the mission. We provide evidence that these do not originate from the laser frequency stabilization scheme which worked as expected. Therefore, this frequency stabilization would be applicable to other missions with similar laser frequency stability requirements.

关键词： Gravitational wave detection Metrology Noise Optics & lasers laser applications data analysis Gravitational wave detectors Optical interferometry Satellite data analysis

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First detection of collective oscillations of a stored deuteron beam with an amplitude close to the quantum limit

arXiv

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arXiv 2021年

作者： Slim, J. Nikolaev, N.N. Rathmann, Frank Wirzba, A. Nass, A. Hejny, V. Pretz, J. Soltner, H. Abusaif, F. Aggarwal, A. Aksentev, A. Andres, A. Barion, l. Ciullo, G. dymov, S. Gebel, R. Gaisser, M. Grigoryev, K. Grzonka, d. Javakhishvili, O. Kacharava, A. Kamerdzhiev, V. Karanth, S. Keshelashvili, I. lehrach, A. lenisa, P. lomidze, N. lorentz, B. Magiera, A. McHedlishvili, d. Müller, F. Pesce, A. Poncza, V. Prasuhn, d. Saleev, A. Shmakova, V. Ströher, H. Tabidze, M. Tagliente, G. Valdau, Y. Wagner, T. Weidemann, C. Wrońska, A. Żurek, M. III. Physikalisches Institut B RWTH Aachen University Aachen52056 Germany L.D. Landau Institute for Theoretical Physics Chernogolovka142432 Russia Moscow Institute for Physics and Technology Dolgoprudny141700 Russia Institut für Kernphysik Forschungszentrum Jülich Jülich52425 Germany Institute for Advanced Simulation Forschungszentrum Jülich Jülich52425 Germany Zentralinstitut für Engineering Elektronik und Analytik Forschungszentrum Jülich Jülich52425 Germany Marian Smoluchowski Institute of Physics Jagiellonian University Cracow30348 Poland Institute for Nuclear Research Russian Academy of Sciences Moscow117312 Russia University of Ferrara Istituto Nazionale di Fisica Nucleare Ferrara44100 Italy Laboratory of Nuclear Problems Joint Institute for Nuclear Research Dubna141980 Russia Department of Electrical and Computer Engineering Agricultural University of Georgia Tbilisi0159 Georgia High Energy Physics Institute Tbilisi State University Tbilisi0186 Georgia GSI Helmholtzzentrum für Schwerionenforschung Darmstadt64291 Germany Istituto Nazionale di Fisica Nucleare sez. Bari Bari70125 Italy Lawrence Berkeley National Laboratory BerkeleyCA94720 United States

We investigated coherent betatron oscillations of a deuteron beam in the storage ring COSY, excited by a detuned radio-frequency Wien filter. The beam oscillations were detected by conventional beam position monitors. With the currently available apparatus, we show that oscillation amplitudes down to 1 µm can be detected. The interpretation of the response of the stored beam to the detuned radio-frequency Wien filter is based on simulations of the beam evolution in the lattice of the ring and realistic time-dependent 3d field maps of the Wien filter. Future measurements of the electric dipole moment of protons will, however, require control of the relative position of counter-propagating beams in the sub-picometer range. Since here the stored beam can be considered as a rarefied gas of uncorrelated particles, we moreover demonstrate that the amplitudes of the zero-point (ground state) betatron oscillations of individual particles are only a factor of about 10 larger than the Heisenberg uncertainty limit. As a consequence of this, we conclude that quantum mechanics does not preclude the control of the beam centroids to sub-picometer accuracy. The smallest lorentz force exerted on a single particle that we have been able to determine is 10 aN. © 2021, CC BY.

关键词： Radio waves

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