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Renewable hydrogen production from butanol:a review

Clean Energy 2017年第1期1卷 90-101页

作者： Ronak Patel Sanjay Patel Chemical Engineering Department Institute of TechnologyNirma UniversityAhmedabadGujarat 382481India Chemical Engineering Department L.D.College of EngineeringAhmedabadGujarat 380015India

Hydrogen production from butanol is a promising alternative when it is obtained from bio-butanol or bio-oil due to the higher hydrogen content compared to other oxygenates such as methanol,ethanol or *** and operating conditions play a crucial role in hydrogen *** and Rh are metals mainly used for butanol steam reforming,oxidative steam reforming and partial *** such as Cu can improve catalytic activity in many ***,support-metal interaction and catalyst preparation technique also play a decisive role in the stability and hydrogen production capacity of *** reforming technique as an option is more frequently researched due to higher hydrogen production capability in comparison to other thermochemical techniques despite its endothermic *** use of the oxidative steam reforming and partial oxidation has the advantages of requiring less energy and longer stability of ***,the hydrogen yield is *** article brings together and examines the latest research on hydrogen production from butanol via steam reforming,oxidative steam reforming and partial oxidation *** addition,the review examines a few thermodynamic studies based on sorption-enhanced steam reforming and dry reforming where there is potential for hydrogen extraction.

关键词： butanol hydrogen production steam reforming oxidative steam reforming partial oxidation

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In-depth analysis of lISA Pathfinder performance results: Time evolution, noise projection, physical models, and implications for lISA

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Physical Review d 2024年第4期110卷 042004页

作者： M. Armano H. Audley J. Baird P. Binetruy M. Born d. Bortoluzzi E. Castelli A. Cavalleri A. Cesarini V. Chiavegato A. M. Cruise d. dal Bosco K. danzmann M. de deus Silva I. diepholz G. dixon R. dolesi l. Ferraioli V. Ferroni E. d. Fitzsimons M. Freschi l. Gesa d. Giardini F. Gibert R. Giusteri C. Grimani J. Grzymisch I. Harrison M. S. Hartig G. Heinzel M. Hewitson d. Hollington d. Hoyland M. Hueller H. Inchauspé O. Jennrich P. Jetzer B. Johlander N. Karnesis B. Kaune N. Korsakova C. J. Killow 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 M. Nofrarias S. Paczkowski M. Perreur-lloyd A. Petiteau E. Plagnol J. Ramos-Castro J. Reiche F. Rivas d. I. Robertson G. Russano l. Sala J. Slutsky C. F. Sopuerta T. Sumner d. Texier J. I. Thorpe d. Vetrugno S. Vitale G. Wanner H. Ward P. Wass W. J. Weber l. Wissel A. Wittchen C. Zanoni P. Zweifel European Space Astronomy Centre European Space Agency Villanueva de la Cañada 28692 Madrid Spain Albert-Einstein-Institut Max-Planck-Institut für Gravitationsphysik und Leibniz Universität Hannover Callinstraße 38 30167 Hannover Germany Université Paris Cité CNRS Astroparticule et Cosmologie F-75013 Paris France IRFU CEA Université Paris-Saclay F-91191 Gif-sur-Yvette France Department of Industrial Engineering Dipartimento di Fisica Università di Trento and Istituto di Fotonica e Nanotecnologie CNR-Fondazione Bruno Kessler I-38123 Povo Trento Italy DISPEA Università di Urbino Carlo Bo Via Santa Chiara 27 61029 Urbino/INFN Italy The School of Physics and Astronomy University of Birmingham B15 2TT Birmingham United Kingdom 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 Institut de Ciències de l’Espai (ICE CSIC) Campus UAB Carrer de Can Magrans s/n Cerdanyola del Vallès 08193 Spain Institut d’Estudis Espacials de Catalunya (IEEC) Edifici RDIT C/ Esteve Terradas 1 despacho 212 Castelldefels 08860 Spain European Space Technology Centre European Space Agency Keplerlaan 1 2200 AG Noordwijk The Netherlands European Space Operations Centre European Space Agency 64293 Darmstadt Germany Physics Department Blackett Laboratory High Energy Physics Group Imperial College London Prince Consort Road London SW7 2BW United Kingdom Physik Institut Universität Zürich Winterthurerstrasse 190 CH-8057 Zürich Switzerland SUPA Institute for Gravitational Research School of Physics and Astronomy University of Glasgow Glasgow G12 8QQ United Kingdom Department d’Enginyeria Electrònica Universitat Politècnica de Catalunya 08034 Barcelona Spain Gravitational Astrophysics Laboratory NASA Goddard Space Flight Center 8800 Greenbelt Road Greenbelt Maryland 20771 USA Department of Mechanical and Aerospace Engineering MAE-A P.O. B

We present an in-depth analysis of the lISA Pathfinder differential acceleration performance over the entire course of its science operations, spanning approximately 500 days. We find: (1) The evolution of the Brownian noise that dominates the acceleration amplitude spectral density (ASd), for frequencies f≳1 mHz, is consistent with the decaying pressure due to the outgassing of a single gaseous species. (2) Between f=36 μHz and 1 mHz, the acceleration ASd shows a 1/f tail in excess of the Brownian noise of almost constant amplitude, with ≃20% fluctuations over a period of a few days, with no particular time pattern over the course of the mission. (3) At the lowest considered frequency of f=18 μHz, the ASd significantly deviates from the 1/f behavior, because of temperature fluctuations that appear to modulate a quasistatic pressure gradient, sustained by the asymmetries of the outgassing pattern. We also present the results of a projection of the observed acceleration noise on the potential sources for which we had either a direct correlation measurement or a quantitative estimate from dedicated experiments. These sources account for approximately 40% of the noise power in the 1/f tail. Finally, we analyze the possible sources of the remaining unexplained fraction and identify the possible measures that may be taken to keep those under control in lISA.

关键词： Gravitational waves Gravitational wave detectors

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First Measurement of a02(1320) Polarized Photoproduction Cross Section

arXiv

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arXiv 2025年

作者： Afzal, F. Akondi, C.S. Albrecht, M. Amaryan, M. Arrigo, S. Arroyave, V. Asaturyan, A. Austregesilo, A. Baldwin, Z. Barbosa, F. Barlow, J. Barriga, E. Barsotti, R. Barton, d. Baturin, V. Berdnikov, V.V. Black, T. Boeglin, W. Boer, M. Briscoe, W.J. Britton, T. Cao, S. Chudakov, E. Chung, G. Cole, P.l. Cortes, O. Crede, V. dalton, M.M. darulis, d. deur, A. dobbs, S. dolgolenko, A. dugger, M. dzhygadlo, R. Ebersole, d. Edo, M. Egiyan, H. Erbora, T. Eugenio, P. Fabrizi, A. Fanelli, C. Fang, S. Fitches, J. Foda, A.M. Furletov, S. Gan, l. Gao, H. Gardner, A. Gasparian, A. Glazier, d.I. Gleason, C. Goryachev, V.S. Grube, B. Guo, J. Guo, l. Hernandez, J. Hernandez, K. Hoffman, N.d. Hornidge, d. Hou, G. Hurck, P. Hurley, A. Imoehl, W. Ireland, d.G. Ito, M.M. Jaegle, I. Jarvis, N.S. Jeske, T. Jing, M. Jones, R.T. Kakoyan, V. Kalicy, G. Khachatryan, V. Kourkoumelis, C. laduke, A. larin, I. lawrence, d. lersch, d.I. li, H. liu, B. livingston, K. lolos, G.J. lorenti, l. lyubovitskij, V. Ma, R. Mahmood, A. Marukyan, H. Matveev, V. McCaughan, M. McCracken, M. Meyer, C.A. Miskimen, R. Mitchell, R.E. Mizutani, K. Moran, P. Neelamana, V. Ng, l. Nissen, E. Orešić, S. Ostrovidov, A.I. Papandreou, Z. Paudel, C. Pedroni, R. Pentchev, l. Peters, K.J. Prather, E. Veetil, l. Puthiya Rakshit, S. Reinhold, J. Remington, A. Ritchie, B.G. Ritman, J. Rodriguez, G. Romanov, d. Saldana, K. Salgado, C. Schadmand, S. Schertz, A.M. Scheuer, K. Schick, A. Schmidt, A. Schumacher, R.A. Schwiening, J. Scott, M. Septian, N. Sharp, P. Shen, X. Shepherd, M.R. Sikes, J. Smith, A. Smith, E.S. Sober, d.I. Somov, A. Somov, S. Stevens, J.R. Strakovsky, I.I. Sumner, B. Suresh, K. Tarasov, V.V. Taylor, S. Teymurazyan, A. Thiel, A. Viducic, T. Whitlatch, T. Wickramaarachchi, N. Wunderlich, Y. Yu, B. Zarling, J. Zhang, Z. Zhou, X. Zihlmann, B. Polytechnic Sciences and Mathematics School of Applied Sciences and Arts Arizona State University TempeAZ85287 United States Department of Physics National and Kapodistrian University of Athens Athens15771 Greece Ruhr-Universität-Bochum Institut für Experimentalphysik BochumD-44801 Germany Helmholtz-Institut für Strahlen- und Kernphysik Universität Bonn BonnD-53115 Germany Department of Physics Carnegie Mellon University PittsburghPA15213 United States Department of Physics The Catholic University of America WashingtonDC20064 United States Department of Physics University of Connecticut StorrsCT06269 United States Department of Physics Duke University DurhamNC27708 United States Department of Physics Florida International University MiamiFL33199 United States Department of Physics Florida State University TallahasseeFL32306 United States Department of Physics The George Washington University WashingtonDC20052 United States School of Physics and Astronomy University of Glasgow GlasgowG12 8QQ United Kingdom GSI Helmholtzzentrum für Schwerionenforschung GmbH DarmstadtD-64291 Germany Institute of High Energy Physics Beijing100049 China Department of Physics Indiana University BloomingtonIN47405 United States National Research Centre Kurchatov Institute Moscow123182 Russia Department of Physics Lamar University BeaumontTX77710 United States Department of Physics University of Massachusetts AmherstMA01003 United States National Research Nuclear University Moscow Engineering Physics Institute Moscow115409 Russia Department of Physics Mount Allison University SackvilleNBE4L 1E6 Canada Department of Physics Norfolk State University NorfolkVA23504 United States Department of Physics North Carolina A&T State University GreensboroNC27411 United States Department of Physics and Physical Oceanography University of North Carolina at Wilmington WilmingtonNC28403 United States Department of Physics Old Dominion University Norf

We measure for the first time the differential photoproduction cross section dσ/dt of the a2(1320) meson at an average photon beam energy of 8.5 GeV, using data with an integrated luminosity of 104 pb−1 collected by the GlueX experiment. We fully reconstruct the γp → ηπ0p reaction and perform a partial-wave analysis in the a2(1320) mass region with amplitudes that incorporate the linear polarization of the beam. This allows us to separate for the first time the contributions of natural- and unnatural-parity exchanges. These measurements provide novel information about the photoproduction mechanism, which is critical for the search for spin-exotic states. Copyright © 2025, The Authors. All rights reserved.

关键词： Polarization

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Search for neutrino sources from the direction of IceCube alert events 38

Search for neutrino sources from the direction of IceCube al...

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38th International Cosmic Ray Conference, ICRC 2023

作者： Karl, Martina Abbasi, R. Ackermann, M. Adams, J. Agarwalla, S.K. Aguilar, J.A. Ahlers, M. Alameddine, J.M. Amin, N.M. Andeen, K. Anton, G. Argüelles, C. Ashida, Y. Athanasiadou, S. Axani, S.N. Bai, X. Balagopal, A.V. Baricevic, M. Barwick, S.W. Basu, V. Bay, R. Beatty, J.J. Becker Tjus, J. Beise, J. Bellenghi, C. Benning, C. BenZvi, S. Berley, d. Bernardini, E. Besson, d.Z. Blaufuss, E. Blot, S. Bontempo, F. Book, J.Y. Boscolo Meneguolo, C. Böser, S. Botner, O. Böttcher, J. Bourbeau, E. Braun, J. Brinson, B. Brostean-Kaiser, J. Burley, R.T. Busse, R.S. Butterfield, d. Campana, M.A. Carloni, K. Carnie-Bronca, E.G. Chattopadhyay, S. Chau, N. Chen, C. Chen, Z. Chirkin, d. Choi, S. Clark, B.A. Classen, l. Coleman, A. Collin, G.H. Connolly, A. Conrad, J.M. Coppin, P. Correa, P. Cowen, d.F. dave, P. de Clercq, C. delaunay, J.J. delgado, d. deng, S. deoskar, K. desai, A. desiati, P. de Vries, K.d. de Wasseige, G. deYoung, T. diaz, A. díaz-Vélez, J.C. dittmer, M. domi, A. dujmovic, H. duVernois, M.A. Ehrhardt, T. Eller, P. Ellinger, E. El Mentawi, S. Elsässer, d. Engel, R. Erpenbeck, H. Evans, J. Evenson, P.A. Fan, K.l. Fang, K. Farrag, K. Fazely, A.R. Fedynitch, A. Feigl, N. Fiedlschuster, S. Finley, C. Fischer, l. Fox, d. Franckowiak, A. Fritz, A. Fürst, P. Gallagher, J. Ganster, E. Garcia, A. Gerhardt, l. Ghadimi, A. Glaser, C. Glauch, T. Glüsenkamp, T. Goehlke, N. Gonzalez, J.G. Goswami, S. Grant, d. Gray, S.J. Gries, O. Griffin, S. Griswold, S. Groth, K.M. Günther, C. Gutjahr, P. Haack, C. Hallgren, A. Halliday, R. Halve, l. Halzen, F. Hamdaoui, H. Ha Minh, M. Hanson, K. Hardin, J. Harnisch, A.A. Hatch, P. Haungs, A. Helbing, K. Hellrung, J. Henningsen, F. Heuermann, l. Heyer, N. Hickford, S. Hidvegi, A. Hill, C. Hill, G.C. Hoffman, K.d. Hori, S. Hoshina, K. Hou, W. Huber, T. Hultqvist, K. Hünnefeld, M. Hussain, R. Hymon, K. In, S. Ishihara, A. Jacquart, M. Janik, O. Jansson, M. Japaridze, G.S. European Southern Observatory Karl-Schwarzschild-Straße 2 Garching bei MünchenD-85748 Germany III. Physikalisches Institut RWTH Aachen University AachenD-52056 Germany Department of Physics University of Adelaide Adelaide5005 Australia Dept. of Physics and Astronomy University of Alaska Anchorage 3211 Providence Dr. AnchorageAK99508 United States Dept. of Physics University of Texas at Arlington 502 Yates St. Science Hall Rm 108 Box 19059 ArlingtonTX76019 United States CTSPS Clark-Atlanta University AtlantaGA30314 United States School of Physics Center for Relativistic Astrophysics Georgia Institute of Technology AtlantaGA30332 United States Dept. of Physics Southern University Baton RougeLA70813 United States Dept. of Physics University of California BerkeleyCA94720 United States Lawrence Berkeley National Laboratory BerkeleyCA94720 United States Institut für Physik Humboldt-Universität zu Berlin BerlinD-12489 Germany Fakultät für Physik & Astronomie Ruhr-Universität Bochum BochumD-44780 Germany Université Libre de Bruxelles Science Faculty CP230 BrusselsB-1050 Belgium Dienst ELEM BrusselsB-1050 Belgium Department of Physics Laboratory for Particle Physics and Cosmology Harvard University CambridgeMA02138 United States Dept. of Physics Massachusetts Institute of Technology CambridgeMA02139 United States Dept. of Physics The International Center for Hadron Astrophysics Chiba University Chiba263-8522 Japan Department of Physics Loyola University Chicago ChicagoIL60660 United States Dept. of Physics and Astronomy University of Canterbury Private Bag 4800 Christchurch New Zealand Dept. of Physics University of Maryland College ParkMD20742 United States Dept. of Astronomy Ohio State University ColumbusOH43210 United States Dept. of Physics Center for Cosmology and Astro-Particle Physics Ohio State University ColumbusOH43210 United States Niels Bohr Institute University of Copenhagen CopenhagenDK-2100 Denm

We search for additional neutrino emission from the direction of IceCube’s highest energy public alert events. We take the arrival direction of 122 events with a high probability of being of astrophysical origin and look for steady and transient emission. We investigate 11 years of reprocessed and recalibrated archival IceCube data. For the steady scenario, we investigate if the potential emission is dominated by a single strong source or by many weaker sources. In contrast, for the transient emission we only search for single sources. In both cases, we find no significant additional neutrino component. Not having observed any significant excess, we constrain the maximal neutrino flux coming from all 122 origin directions (including the high-energy events) to Φ90%, 100 TeV = 1.2 × 10−15 (TeV cm2 s)−1 at 100 TeV, assuming an E−2 emission, with 90% confidence. The most significant transient emission of all 122 investigated regions of interest is the neutrino flare associated with the blazar TXS 0506+056. With the recalibrated data, the flare properties of this work agree with previous results. We fit a Gaussian time profile centered at μT = 57001+−3826 MJd and with a width of σT = 64+−3510 days. The best fit spectral index is γ = 2.3 ± 0.4 and we fit a single flavor fluence of J100 TeV = 1.2+−1018 × 10−8 (TeV cm2)−1. The global p-value for transient emission is pglobal = 0.156 and, therefore, compatible with background. © Copyright owned by the author(s) under the terms of the Creative Commons.

关键词： Astrophysics

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Joint searches by FACT, H.E.S.S., MAGIC and VERITAS for VHE gamma-ray emission associated with neutrinos detected by IceCube 38

Joint searches by FACT, H.E.S.S., MAGIC and VERITAS for VHE ...

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38th International Cosmic Ray Conference, ICRC 2023

作者： Schüssler, Fabian Ashkar, H. Bernardini, E. Berti, A. Bradascio, F. Buson, S. dorner, d. Jin, W. Kukec Mezek, G. Santander, M. Satalecka, K. Schleicher, B. Senniappanh, M. Viale, I. Abhir, J. Baack, d. Balbo, M. Biland, A. Brand, K. Bretz, T. Buss, J. Eisenberger, l. Elsaesser, d. Günther, P. Hildebrand, d. Mannheim, K. Noethe, M. Paravac, A. Rhode, W. Sliusar, V. Hasan, S. Walter, R. Aharonian, F. Ait Benkhali, F. Alkan, A. Aschersleben, J. Backes, M. Baktash, A. Barbosa Martins, V. Barnacka, A. Barnard, J. Batzofin, R. Becherini, Y. Beck, G. Berge, d. Bernlöhr, K. Bi, B. Böttcher, M. Boisson, C. Bolmont, J. de Bony de lavergne, M. Borowska, J. Bouyahiaoui, M. Breuhaus, M. Brose, R. Brown, A. Brun, F. Bruno, B. Bulik, T. Burger-Scheidlin, C. Bylund, T. Cangemi, F. Caroff, S. Casanova, S. Cecil, R. Celic, J. Cerruti, M. Chambery, P. Chand, T. Chandra, S. Chen, A. Chibueze, J. Chibueze, O. Collins, T. Cotter, G. Cristofari, P. damascene Mbarubucyeye, J. davids, I.d. davies, J. de Jonge, l. devin, J. djannati-Ataï, A. dmytriiev, A. doroshenko, V. dreyer, l. du Plessis, l. Egberts, K. Einecke, S. Ernenwein, J.-P. Fegan, S. Feijen, K. de Clairfontaine, G. Fichet Fontaine, G. lott, F. Füßling, M. Funk, S. Gabici, S. Gallant, Y.A. Ghafourizadeh, S. Giavitto, G. Giunti, l. Glawion, d. Glicenstein, J.F. Glombitza, J. Goswami, P. Grolleron, G. Grondin, M.-H. Haerer, l. Hattingh, S. Haupt, M. Hermann, G. Hinton, J.A. Hofmann, W. Holch, T.l. Holler, M. Horns, d. Huang, Zhiqiu Jaitly, A. Jamrozy, M. Jankowsky, F. Jardin-Blicq, A. Joshi, V. Jung-Richardt, I. Kasai, E. Katarzynski, K. Katjaita, H. Khangulyan, d. Khatoon, R. Khélifi, B. Klepser, S. Kluzniak, W. Komin, Nu Konno, R. Kosack, K. Kostunin, d. Kundu, A. lamanna, G. lang, R.G. le Stum, S. lefranc, V. leitl, F. lemière, A. lemoine-Goumard, M. lenain, J.-P. leuschner, F. luashvili, A. lypova, I. Mackey, J. Malyshev, d. III. Physikalisches Institut RWTH Aachen University AachenD-52056 Germany Department of Physics University of Adelaide AdelaideSA5005 Australia Dept. of Physics and Astronomy University of Alaska Anchorage 3211 Providence Dr. AnchorageAK99508 United States Dept. of Physics University of Texas at Arlington 502 Yates St. Science Hall Box 19059 ArlingtonTX76019 United States CTSPS Clark-Atlanta University AtlantaGA30314 United States School of Physics Center for Relativistic Astrophysics Georgia Institute of Technology AtlantaGA30332 United States Dept. of Physics Southern University Baton RougeLA70813 United States Dept. of Physics University of California BerkeleyCA94720 United States Lawrence Berkeley National Laboratory BerkeleyCA94720 United States Institut für Physik Humboldt-Universität zu Berlin BerlinD-12489 Germany Fakultät für Physik & Astronomie Ruhr-Universität Bochum BochumD-44780 Germany Université Libre de Bruxelles Science Faculty CP230 BrusselsB-1050 Belgium Dienst ELEM BrusselsB-1050 Belgium Department of Physics Laboratory for Particle Physics and Cosmology Harvard University CambridgeMA02138 United States Dept. of Physics Massachusetts Institute of Technology CambridgeMA02139 United States Dept. of Physics The International Center for Hadron Astrophysics Chiba University Chiba263-8522 Japan Department of Physics Loyola University Chicago ChicagoIL60660 United States Dept. of Physics and Astronomy University of Canterbury Private Bag 4800 Christchurch New Zealand Dept. of Physics University of Maryland College ParkMD20742 United States Dept. of Astronomy Ohio State University ColumbusOH43210 United States Dept. of Physics Center for Cosmology and Astro-Particle Physics Ohio State University ColumbusOH43210 United States Niels Bohr Institute University of Copenhagen CopenhagenDK-2100 Denmark Dept. of Physics TU Dortmund University DortmundD-44221 Germany Dept. of Physics and Astronomy

The sources of the astrophysical flux of high-energy neutrinos detected by IceCube are still largely unknown, but searches for temporal and spatial correlation between neutrinos and electromagnetic radiation are a promising approach in this endeavor. All major imaging atmospheric Cherenkov telescopes (IACTs) - FACT, H.E.S.S., MAGIC, and VERITAS - operate an active follow-up program of target-of-opportunity observations of neutrino alerts issued by IceCube. These programs use several complementary neutrino alert streams. A publicly distributed alert stream is formed by individual high-energy neutrino candidate events of potentially astrophysical origin, such as IceCube-170922A (which could be linked to the flaring blazar TXS 0506+056). A privately distributed alert stream is formed by clusters of neutrino events in time and space around either pre-selected gamma-ray sources or anywhere in the sky. Here, we present joint searches for multi-wavelength emission associated with a set of IceCube alerts, both private and public, received through mid-January 2021. We will give an overview of the programs of the participating IACTs. We will showcase the various follow-up and data analysis strategies employed in response to the different alert types and various possible counterpart scenarios. Finally, we will present results from a combined analysis of the VHE gamma-ray observations obtained across all involved instruments, as well as relevant multi-wavelength data. © Copyright owned by the author(s) under the terms of the Creative Commons.

关键词： Cosmic rays

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Cerebral stiffness changes during visual stimulation: differential physiological mechanisms characterized by opposing mechanical effects

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Neuroimage: Reports 2021年第2期1卷 100014-100014页

作者： Forouhandehpour, Reihaneh Bernier, Michaël Gilbert, Guillaume Butler, Russell Whittingstall, Kevin Van Houten, Elijah Department of Nuclear Medicine and Radiobiology University of Sherbrooke 3001 12e Avenue Nord Sherbrooke J1H 5N4 QC Canada Martinos Center - MGH - Harvard Medical School 149 Thirteenth Street Charlestown 02129 MA United States MR Clinical Science Philips Healthcare Canada 281 Hillmount RdMarkham Ontario L6C 2S3 Canada Computer Science Department Faculty of Arts and Science Bishop's University 2600 College St Sherbrooke J1M 1Z QC Canada Department of Mechanical Engineering University of Sherbrooke Sherbrooke 2500 Boul. de L'Université Sherbrooke J1K 2R1 QC Canada

We performed functional intrinsic Magnetic Resonance Elastography (fiMRE) as well as Time of Flight angiography and BOld fMRI on 7 healthy human subjects to monitor shear stiffness and arterial dilation during periods of prolonged visual stimulation. FiMRE activation with increased stiffness was observed to occur almost equally within brain white and gray matter (49.7±14.0% and 40.9±12.2%, respectively), while activation with decreased stiffness was significantly (p=0.018) more likely to occur in white matter than gray matter (50.8±11.4% and 37.0±4.5%, respectively). At the low mechanical activation and block design frequencies used in this intrinsic MRE (iMRE) approach, the aggregate stiffness change across the entire BOld activation region was not significant. However, we observed significant reduction in shear stiffness (1.40 ± 0.15 to 0.68 ± 0.22 [kPa], p < 0.001) in areas adjacent to the Posterior Cerebral Artery, where vasodilation is evident, in the V1 region. In addition, we observed significant shear stiffness increase (1.29 ± 0.12 to 0.62 ± 0.16 [kPa], p < 0.001) in areas adjacent to the Middle Temporal or V5 region of the visual cortex. These results show that iMRE can measure intrinsic cerebro-mechanical reactions due to visual stimulation as well as the differential physiological response detected in distinct regions of the visual cortex. © 2021 The Authors

关键词： Cerebral stiffness Cerebrovascular response Functional imaging Intrinsic MR Elastography Visual stimulation

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TRUSS, a european innovative training network dealing with the challenges of an aging infrastructure network 7

TRUSS, a european innovative training network dealing with t...

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7th Asia-Pacific Workshop on Structural Health Monitoring, APWSHM 2018

作者： Gonzalez, A. Barrias, A. Teixeira, R. Martínez, d. Heitner, B. Antonopoulou, S. Zou, G. Merino, A. Gonzalez Sourav, S.-N. Casas, J.R. O'connor, A. Nogal, M. Obrien, E. Yalamas, T. Mcnally, C. Banisoleiman, K. Costas, l. Al-Sabah, S. Civil Engineering School University College Dublin Dublin Ireland Department of Construction Engineering Universitat Politecnica Catalunya Barcelona Spain Department of Civil Trinity College Dublin Structural and Environmental Engineering Ireland Centre D'Affaire Du Zenit L'Arche Phimeca Engineering 63800 France Southampton Boldrewood Innovation Campus Lloyd's Register EMEA Southampton United Kingdom Engineering Equipos Nucleares S.A. Av.Juan Carlos I8 Maliano39600 Spain Building Engineering Ove Arup and Partners Ireland 50 Ringsend Road Dublin Ireland

ISBN: (纸本)9783000603594

Inspections and maintenance of infrastructure are expensive. In some cases, overdue or insufficient maintenance/monitoring can lead to an unacceptable risk of collapse and to a tragic failure as the Morandi bridge in Genoa, Italy, on 14th August 2018. An accurate assessment of the safety of a structure is a difficult task due to uncertainties associated with the aging and response of the structure, with the operational and environmental loads, and with their interaction. during the period from 2015 to 2019, the project TRUSS (Training in Reducing Uncertainty in Structural Safety) ITN (Innovative Training Network), funded by the EU H2020 Marie Curie-Sklodowska Action (MSCA) programme, has worked towards improving the structural assessment of buildings, energy, marine, and transport infrastructure. Fourteen Early Stage Researchers (ESRs) have been recruited to carry out related research on new materials, testing methods, improved and more efficient modelling methods and management strategies, and sensor and algorithm development for Structural Health Monitoring (SHM) purposes. This research has been enhanced by an advanced program of scientific and professional training delivered via a collaboration between 6 Universities, 1 research institute and 11 companies from 5 European countries. The high proportion of companies participating in TRUSS ITN has ensured significant industry expertise and has introduced a diverse range of perspectives to the consortium on the activities necessary to do business in the structural safety sector. © APWSHM 2018. All rights reserved.

关键词： Structural health monitoring

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Roadmap for Optical Tweezers

arXiv

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arXiv 2022年

作者： Volpe, Giovanni Maragò, Onofrio M. Rubinzstein-dunlop, Halina Pesce, Giuseppe Stilgoe, Alexander B. Volpe, Giorgio Tkachenko, Georgiy Truong, Viet Giang Chormaic, Síle Nic Kalantarifard, Fatemeh Elahi, Parviz Käll, Mikael Callegari, Agnese Marqués, Manuel I. Neves, Antonio A.R. Moreira, Wendel l. Fontes, Adriana Cesar, Carlos l. Saija, Rosalba Saidi, Abir Beck, Paul Eismann, Jörg S. Banzer, Peter Fernandes, Thales F.d. Pedaci, Francesco Bowen, Warwick P. Vaippully, Rahul lokesh, Muruga Roy, Basudev Thalhammer, Gregor Ritsch-Marte, Monika García, laura Pérez Arzola, Alejandro V. Castillo, Isaac Pérez Argun, Aykut Muenker, Till M. Vos, Bart E. Betz, Timo Cristiani, Ilaria Minzioni, Paolo Reece, Peter J. Wang, Fan McGloin, david Ndukaife, Justus C. Quidant, Romain Roberts, Reece P. laplane, Cyril Volz, Thomas Gordon, Reuven Hanstorp, dag Marmolejo, Javier Tello Bruce, Graham d. dholakia, Kishan li, Tongcang Brzobohatý, Oto Simpson, Stephen H. Zemánek, Pavel Ritort, Felix Roichman, Yael Bobkova, Valeriia Wittkowski, Raphael denz, Cornelia Kumar, G.V. Pavan Foti, Antonino donato, Maria Grazia Gucciardi, Pietro G. Gardini, l. Bianchi, G. Kashchuk, A. Capitanio, M. Paterson, lynn Jones, P.H. Berg-Sørensen, Kirstine Barooji, Younes F. Oddershede, lene B. Pouladian, Pegah Preece, daryl Adiels, Caroline Beck de luca, Anna Chiara Magazzù, A. Ciriza, d. Bronte Iatì, M.A. Swartzlander, Grover A. Department of Physics University of Gothenburg Gothenburg41296 Sweden CNR IPCF Istituto per i Processi Chimico-Fisici Messina Italy ARC CoE for Engineered Quantum Systems School of Mathematics and Physics The University of Queensland Australia Department of Chemistry University College London 20 Gordon Street LondonWC1H 0AJ United Kingdom Dipartimento di Fisica Università degli studi di Napoli Federico II Italy Okinawa Institute of Science and Technology Graduate University Japan Department of Health Technology Technical University of Denmark Lyngby Denmark Physics Department Boğaziçi University Istanbul Turkey Chalmers University of Technology Gothenburg Sweden Departamento de Física de Materiales IFIMAC Instituto Nicolás Cabrera Universidad Autónoma de Madrid Spain Santo André São Paulo Brazil Tratamento de dados geofísicos Tecnologia e processamento de geologia e geofísica Exploração Petrobras - Petróleo Brasileiro S.A. Rio de Janeiro Rio de Janeiro Brazil Pernambuco Recife Brazil Ceará Fortaleza Brazil Campinas São Paulo Brazil Dipartimento di Scienze Matematiche e Informatiche Scienze Fisiche e Scienze della Terra Università di Messina Italy Institute of Optics Information and Photonics University Erlangen-Nuremberg Staudtstr. 7/B2 ErlangenD-91058 Germany Max Planck Institute for the Science of Light Staudtstr. 2 ErlangenD-91058 Germany Institute of Physics University of Graz NAWI Graz Universitätsplatz 5 Graz8010 Austria Centre de Biologie Structurale CNRS INSERM Univ.Montpellier France Indian Institute of Technology Madras India Institute for Biomedical Physics Medical University of Innsbruck Austria Instituto de Física Universidad Nacional Autónoma de México Ciudad de MéxicoC. P. 04510 Mexico Departamento de Física Universidad Autónoma Metropolitana-Iztapalapa San Rafael Atlixco 186 Ciudad de México09340 Mexico Third Institute of Physics - Biophysics Georg August University Göttingen Germany Department of Electrical

Optical tweezers are tools made of light that enable contactless pushing, trapping, and manipulation of objects ranging from atoms to space light sails. Since the pioneering work by Arthur Ashkin in the 1970s, optical tweezers have evolved into sophisticated instruments and have been employed in a broad range of applications in life sciences, physics, and engineering. These include accurate force and torque measurement at the femtonewton level, microrheology of complex fluids, single micro- and nanoparticle spectroscopy, single-cell analysis, and statistical-physics experiments. This roadmap provides insights into current investigations involving optical forces and optical tweezers from their theoretical foundations to designs and setups. It also offers perspectives for applications to a wide range of research fields, from biophysics to space exploration. Copyright © 2022, The Authors. All rights reserved.

关键词： Optical tweezers

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OpenMM 8: Molecular dynamics Simulation with Machine learning Potentials

arXiv

引用

arXiv 2023年

作者： Eastman, Peter Galvelis, Raimondas Peláez, Raúl P. Abreu, Charlles R.A. Farr, Stephen E. Gallicchio, Emilio Gorenko, Anton Henry, Michael M. Hu, Frank Huang, Jing Krämer, Andreas Michel, Julien Mitchell, Joshua A. Pande, Vijay S. Rodrigues, João P.G.l.M. Rodriguez-Guerra, Jaime Simmonett, Andrew C. Singh, Sukrit Swails, Jason Turner, Philip Wang, Yuanqing Zhang, Ivy Chodera, John d. de Fabritiis, Gianni Markland, Thomas E. Department of Chemistry Stanford University StanfordCA94305 United States Acellera Labs C Dr Trueta 183 Barcelona08005 Spain C Dr. Aiguader 88 Barcelona08003 Spain Chemical Engineering Department School of Chemistry Federal University of Rio de Janeiro Rio de Janeiro68542 Brazil Redesign Science Inc. 180 Varick St. New YorkNY10014 United States EaStCHEM School of Chemistry University of Edinburgh EH9 3FJ United Kingdom Department of Chemistry and Biochemistry Brooklyn College The City University of New York NY United States Ph.D. Program in Chemistry Ph.D. Program in Biochemistry The Graduate Center of the City University of New York New YorkNY United States Stream HPC Koningin Wilhelminaplein 1 - 40601 Amsterdam1062 HG Netherlands Computational and Systems Biology Program Sloan Kettering Institute Memorial Sloan Kettering Cancer Center New YorkNY10065 United States Key Laboratory of Structural Biology of Zhejiang Province School of Life Sciences Westlake University 18 Shilongshan Road Zhejiang Hangzhou310024 China Department of Mathematics and Computer Science Freie Universität Berlin Arnimallee 12 Berlin14195 Germany The Open Force Field Initiative Open Molecular Software Foundation DavisCA95616 United States Andreessen Horowitz 2865 Sand Hill Rd Menlo ParkCA94025 United States Department of Structural Biology Stanford University StanfordCA94305 United States Charité Universitätsmedizin Berlin In silico Toxicology and Structural Bioinformatics Virchowweg 6 Berlin10117 Germany Laboratory of Computational Biology National Heart Lung and Blood Institute National Institutes of Health BethesdaMD20892 United States Entos Inc. 9310 Athena Circle La Jolla CA92037 United States College of Engineering Virginia Polytechnic Institute State University BlacksburgVA24061 United States Simons Center for Computational Physical Chemistry Center for Data Science New York University 24 Waverly Place New YorkNY10004 United States T

Machine learning plays an important and growing role in molecular simulation. The newest version of the OpenMM molecular dynamics toolkit introduces new features to support the use of machine learning potentials. Arbitrary PyTorch models can be added to a simulation and used to compute forces and energy. A higher-level interface allows users to easily model their molecules of interest with general purpose, pretrained potential functions. A collection of optimized CUdA kernels and custom PyTorch operations greatly improves the speed of simulations. We demonstrate these features on simulations of cyclin-dependent kinase 8 (CdK8) and the green fluorescent protein (GFP) chromophore in water. Taken together, these features make it practical to use machine learning to improve the accuracy of simulations at only a modest increase in cost. Copyright © 2023, The Authors. All rights reserved.

关键词： Machine learning

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Search for high-energy neutrino emission from hard X-ray AGN with IceCube 38

Search for high-energy neutrino emission from hard X-ray AGN...

引用

38th International Cosmic Ray Conference, ICRC 2023

作者： Abbasi, R. Ackermann, M. Adams, J. Agarwalla, S.K. Aguilar, J.A. Ahlers, M. Alameddine, J.M. Amin, N.M. Andeen, K. Anton, G. Argüelles, C. Ashida, Y. Athanasiadou, S. Axani, S.N. Bai, X. Balagopal, A.V. Baricevic, M. Barwick, S.W. Basu, V. Bay, R. Beatty, J.J. Becker Tjus, J. Beise, J. Bellenghi, C. Benning, C. BenZvi, S. Berley, d. Bernardini, E. Besson, d.Z. Blaufuss, E. Blot, S. Bontempo, F. Book, J.Y. Boscolo Meneguolo, C. Böser, S. Botner, O. Böttcher, J. Bourbeau, E. Braun, J. Brinson, B. Brostean-Kaiser, J. Burley, R.T. Busse, R.S. Butterfield, d. Campana, M.A. Carloni, K. Carnie-Bronca, E.G. Chattopadhyay, S. Chau, N. Chen, C. Chen, Z. Chirkin, d. Choi, S. Clark, B.A. Classen, l. Coleman, A. Collin, G.H. Connolly, A. Conrad, J.M. Coppin, P. Correa, P. Cowen, d.F. dave, P. de Clercq, C. delaunay, J.J. delgado, d. deng, S. deoskar, K. desai, A. desiati, P. de Vries, K.d. de Wasseige, G. deYoung, T. diaz, A. díaz-Vélez, J.C. dittmer, M. domi, A. dujmovic, H. duVernois, M.A. Ehrhardt, T. Eller, P. Ellinger, E. El Mentawi, S. Elsässer, d. Engel, R. Erpenbeck, H. Evans, J. Evenson, P.A. Fan, K.l. Fang, K. Farrag, K. Fazely, A.R. Fedynitch, A. Feigl, N. Fiedlschuster, S. Finley, C. Fischer, l. Fox, d. Franckowiak, A. Fritz, A. Fürst, P. Gallagher, J. Ganster, E. Garcia, A. Gerhardt, l. Ghadimi, A. Glaser, C. Glauch, T. Glüsenkamp, T. Goehlke, N. Gonzalez, J.G. Goswami, S. Grant, d. Gray, S.J. Gries, O. Griffin, S. Griswold, S. Groth, K.M. Günther, C. Gutjahr, P. Haack, C. Hallgren, A. Halliday, R. Halve, l. Halzen, F. Hamdaoui, H. Ha Minh, M. Hanson, K. Hardin, J. Harnisch, A.A. Hatch, P. Haungs, A. Helbing, K. Hellrung, J. Henningsen, F. Heuermann, l. Heyer, N. Hickford, S. Hidvegi, A. Hill, C. Hill, G.C. Hoffman, K.d. Hori, S. Hoshina, K. Hou, W. Huber, T. Hultqvist, K. Hünnefeld, M. Hussain, R. Hymon, K. In, S. Ishihara, A. Jacquart, M. Janik, O. Jansson, M. Japaridze, G.S. Jeong, M. III. Physikalisches Institut RWTH Aachen University AachenD-52056 Germany Department of Physics University of Adelaide Adelaide5005 Australia Dept. of Physics and Astronomy University of Alaska Anchorage 3211 Providence Dr. AnchorageAK99508 United States Dept. of Physics University of Texas at Arlington 502 Yates St. Science Hall Rm 108 Box 19059 ArlingtonTX76019 United States CTSPS Clark-Atlanta University AtlantaGA30314 United States School of Physics Center for Relativistic Astrophysics Georgia Institute of Technology AtlantaGA30332 United States Dept. of Physics Southern University Baton RougeLA70813 United States Dept. of Physics University of California BerkeleyCA94720 United States Lawrence Berkeley National Laboratory BerkeleyCA94720 United States Institut für Physik Humboldt-Universität zu Berlin BerlinD-12489 Germany Fakultät für Physik & Astronomie Ruhr-Universität Bochum BochumD-44780 Germany Université Libre de Bruxelles Science Faculty CP230 BrusselsB-1050 Belgium Dienst ELEM BrusselsB-1050 Belgium Department of Physics Laboratory for Particle Physics and Cosmology Harvard University CambridgeMA02138 United States Dept. of Physics Massachusetts Institute of Technology CambridgeMA02139 United States Dept. of Physics The International Center for Hadron Astrophysics Chiba University Chiba263-8522 Japan Department of Physics Loyola University Chicago ChicagoIL60660 United States Dept. of Physics and Astronomy University of Canterbury Private Bag 4800 Christchurch New Zealand Dept. of Physics University of Maryland College ParkMD20742 United States Dept. of Astronomy Ohio State University ColumbusOH43210 United States Dept. of Physics Center for Cosmology and Astro-Particle Physics Ohio State University ColumbusOH43210 United States Niels Bohr Institute University of Copenhagen CopenhagenDK-2100 Denmark Dept. of Physics TU Dortmund University DortmundD-44221 Germany Dept. of Physics and Astro

Active Galactic Nuclei (AGN) are powerful astronomical objects with very high luminosities. Theoretical arguments suggest that these objects are capable of accelerating particles to energies of 1020 eV. In environments with matter or photon targets, cosmic-ray interactions transpire leading to the production of pionic gamma rays and neutrinos. Since the AGN environment is rich in gas, dust and photons, they are promising candidate sources of high-energy astrophysical neutrinos. While the neutrinos manage to escape, the gamma rays may further interact and cascade down to hard X-rays in environments with sufficiently large photon or gas targets. We have used 12 years of IceCube data to perform a stacked search and a point source search for high-energy neutrino emission from hard X-ray AGN sampled from Swift-BAT Spectroscopic Survey (BASS) and present the results of these two analyses. © Copyright owned by the author(s) under the terms of the Creative Commons.

关键词： Photons

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