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2D Transition Metal Dichalcogenide: Unraveling High-Yield Phase-Transition Dynamics in Transition Metal Dichalcogenides on Metallic Substrates (Adv. Sci. 7/2019)

引用

Advanced science 2019年第7期6卷 1970042-1970042页

作者： Xinmao Yin Chi Sin Tang Di Wu Weilong Kong Changjian Li Qixing Wang Liang Cao Ming Yang Yung-Huang Chang Dianyu Qi Fangping Ouyang Stephen J. Pennycook Yuan Ping Feng Mark B. H. Breese Shi Jie Wang Wenjing Zhang Andrivo Rusydi Andrew T. S. Wee Department of Physics Faculty of Science National University of Singapore Singapore 117542 Singapore Singapore Synchrotron Light Source (SSLS) National University of Singapore Singapore 117603 Singapore NUS Graduate School for Integrative Sciences and Engineering National University of Singapore Singapore 117456 Singapore International Collaborative Laboratory of 2D Materials for Optoelectronics Science and Technology Shenzhen University Shenzhen 518060 China Hunan Key Laboratory of Super-microstructure and Ultrafast Process School of Physics and Electronics Central South University No. 932 South Lushan Road Changsha Hunan Province 410083 China Department of Materials Science and Engineering National University of Singapore 9 Engineering Drive 1 Singapore 117575 Singapore Anhui Province Key Laboratory of Condensed Matter Physics at Extreme Conditions High Magnetic Field Laboratory of the Chinese Academy of Sciences Hefei 230031 China Institute of Materials Research and Engineering A∗STAR (Agency for Science Technology and Research) 2 Fusionopolis Way Singapore 138634 Singapore Bachelor Program in Interdisciplinary Studies National Yunlin University of Science and Technology Yunlin 640 Taiwan

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Lithium‐Ion Batteries: Cooling Induced Surface Reconstruction during Synthesis of High‐Ni Layered Oxides (Adv. Energy Mater. 43/2019)

引用

Advanced Energy materials 2019年第43期9卷

作者： Ming‐Jian Zhang Xiaobing Hu Maofan Li Yandong Duan Luyi Yang Chong Yin Mingyuan Ge Xianghui Xiao Wah‐Keat Lee Jun Young Peter Ko Khalil Amine Zonghai Chen Yimei Zhu Eric Dooryhee Jianming Bai Feng Pan Feng Wang School of Advanced Materials Peking University Shenzhen Graduate School Shenzhen 518055 P. R. China Sustainable Energy Technologies Department Brookhaven National Laboratory Upton NY 11973 USA Condensed Matter Physics and Materials Science Department Brookhaven National Laboratory Upton NY 11973 USA School of Science Hebei University of Science and Technology Shijiazhuang 050018 P. R. China Ningbo Institute of Materials Technology and Engineering Chinese Academy of Sciences Ningbo 315201 P. R. China National Synchrotron Light Source II Brookhaven National Laboratory Upton NY 11973 USA The Cornell High Energy Synchrotron Source Cornell University Ithaca NY 14853 USA Electrochemical Technology Program Chemical Sciences and Engineering Division Argonne National Laboratory 9700 South Cass Avenue Lemont IL 60439 USA Materials Science and Engineering Stanford University Stanford CA 94305 USA Institute for Research and Medical Consultations (IRMC) Imam Abdulrahman Bin Faisal University (IAU) Dammam 34212 Saudi Arabia

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Diversity and longitudinal records: Genetic architecture of disease associations and polygenic risk in the Taiwanese Han population

引用

science advances 2025年第23期11卷 eadt0539页

作者： Ting-Yuan Liu Hsing-Fang Lu Yu-Chia Chen Chi-Chou Liao Ying-Ju Lin Jai-Sing Yang Wen-Ling Liao Wei-De Lin Shih-Yin Chen Yu-Chuen Huang Wei-Yong Lin Yu-Huei Liu Kai-Cheng Hsu Shih-Sheng Chang Hong-Da Chen Yu-Pao Chou Jan-Gowth Chang Chung-Hsing Wang Chwen-Tzuei Chang Chung-Ming Huang Kai-Jieh Yeo Tzu-Yuan Wang Chin-Chung Yeh Jiunn-Horng Chen Chi-Ping Huang Hsueh-Chou Lai Rong-Hsing Chen Hui-Ju Lin Po-Yuan Wu Jiu-Yao Wang Chin-Chi Kuo Der-Yang Cho Chang-Hai Tsai Fuu-Jen Tsai Million-person precision medicine initiative Department of Medical Research China Medical University Hospital Taichung 40402 Taiwan. Master Program for Digital Health Innovation China Medical University Taichung 406040 Taiwan. Department of Medical Research China Medical University Hospital Taichung 40402 Taiwan. Genetic Center Department of Medical Research China Medical University Hospital Taichung 40402 Taiwan. School of Post Baccalaureate Chinese Medicine China Medical University Taichung 404333 Taiwan. Graduate Institute of Integrated Medicine College of Chinese Medicine China Medical University Taichung 406040 Taiwan. Center for Personalized Medicine Department of Medical Research China Medical University Hospital Taichung 406040 Taiwan. School of Chinese Medicine China Medical University Taichung 406040 Taiwan. Drug Development Center China Medical University Taichung 406040 Taiwan. Artificial Intelligence Center China Medical University Hospital Taichung 40402 Taiwan. Department of Neurology China Medical University Hospital Taichung 40402 Taiwan. Department of Medicine China Medical University Taichung 406040 Taiwan. Department of Laboratory Medicine China Medical University Hospital Taichung 40402 Taiwan. Department of Bioinformatics and Medical Engineering Asia University Taichung 41300 Taiwan. Department of Medical Laboratory Science and Biotechnology China Medical University Taichung Taiwan. Division of Genetics and Metabolism Children's Hospital of China Medical University Taichung 404447 Taiwan. Intelligent Diabetes Metabolism and Exercise Center Department of Internal Medicine China Medical University Hospital Taichung 40402 Taiwan. Division of Immunology and Rheumatology Department of Internal Medicine China Medical University Hospital Taichung 40402 Taiwan. Division of Endocrine and Metabolism China Medical University Hospital Taichung 40402 Taiwan. Department of Urology China Medical University Hospital Taichung 40402 Taiwan. Cen

We addressed the underrepresentation of non-European populations in genome-wide association studies (GWASs) by building HiGenome, a large-scale genetic resource for the Taiwanese Han population. Using a custom genotyping array, we integrated deidentified electronic medical records (2003 to 2021) with genomic data to enable GWASs, phenome-wide association studies, and polygenic risk score (PRS) analysis. Among 413,000 participants, 323,397 passed ancestry and quality control filtering. GWASs covered 1085 traits, focusing on diseases prevalent in Taiwan such as type 2 diabetes, chronic kidney disease, gout, and alcoholic liver damage. PRSs were calculated for 238 traits, with the strongest associations observed in musculoskeletal disorders. Incorporating PRS into clinical practice supports early risk prediction and personalized prevention. To further expand translational value, we also conducted pharmacogenomic analysis and human leukocyte antigen typing. HiGenome offers a large-scale genetic and clinical dataset from the Taiwanese Han population, supporting population-specific analyses and precision medicine development in East Asia. The hospital-based design enables continuous follow-up and longitudinal data expansion.

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Spatially separated self-assembled silver dendrites for highly sensitive SERS applications

arXiv

引用

arXiv 2018年

作者： Yakimchuk, D.V. Kaniukov, E.Y. Lepeshov, S.I. Bundyukova, V.D. Demyanov, S.E. Arzumanyan, G.M. Doroshkevich, N.V. Mamatkulov, K.Z. Alù, A. Bochmann, A. Presselt, M. Stranik, O. Krasnok, A. Sivakov, V. Scientific-Practical Materials Research Center NAS of Belarus Minsk ITMO University St. Petersburg Russian Federation Joint Institute for Nuclear Research Dubna Russian Federation Dubna State University Dubna Russian Federation Photonics Initiative Advanced Science Research Center Physics Program Graduate Center City University of New York Department of Electrical Engineering City College of New York United States Ernst-Abbe-Hochschule Jena Jena Germany Leibniz Institute of Photonic Technology Jena Germany

Even after more than four decades of rapid-pace advances, the adoption of Surface-Enhanced Raman Scattering (SERS) remains limited, due to the difficulties in fabrication of effective and affordable nanostructured surfaces or templates. From this point-of-view, self-assembly techniques of SERS substrates formation allowing fabrication of highly branched dendritic silver nanostructures, which are very promising for biosensor applications. However, these techniques suffer from the lack of control over the resulting structures. Herein, we propose an electroless wetchemical approach for highly reproducible fabrication of spatially separated plasmonic active silver dendrites in a porous matrix of Si/SiO2 template via controlled self-assembly of silver in a limited volume. The proposed approach allows fabrication of spatially separated silver dendrites with sub-10-nm gaps between neighboring branches, which possessing strong electric field enhancement ina wide spectral range. The fabricated silver dendritic structures enable a SERS enhancement factor of ∼108and the analyte detection limit of ∼10-15M, which is at the level of single molecule sensitivity. The comparison of simulation results with SERS experiments allows to distinguish the presence of electromagnetic and chemical contributions, which have a different effect at various analyte concentrations. Copyright © 2018, The Authors. All rights reserved.

关键词： Fabrication

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Probing the interaction of noble gases with pristine and nitrogen-doped graphene through Raman spectroscopy

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Physical Review B 2018年第19期97卷 195419-195419页

作者： Renato Cunha Néstor Perea-López Ana Laura Elías Kazunori Fujisawa Victor Carozo Simin Feng Ruitao Lv Maria Cristina dos Santos Mauricio Terrones Paulo T. Araujo Department of Physics The Pennsylvania State University University Park Pennsylvania 16802 USA Center for 2-Dimensional and Layered Materials The Pennsylvania State University University Park Pennsylvania 16802 USA Faculdade de Ciências Exatas e Naturais Universidade Federal do Pará Campus Universitário de Tocantins PA 68.400-000 Brazil Department of Physics Pontifical Catholic University of Rio de Janeiro Rio de Janeiro RJ 22451900 Brazil Key Laboratory of Advanced Materials (MOE) School of Materials Science and Engineering Tsinghua University Beijing 100084 People's Republic of China Zernike Institute for Advanced Materials University of Groningen Nijenborgh 4 Groningen 9747 AG The Netherlands Department of Chemistry The Pennsylvania State University University Park Pennsylvania 16802 USA Institute of Carbon Science and Technology Shinshu University 4-17-1 Wakasato Nagano-city 380–8553 Japan Department of Physics and Astronomy The University of Alabama Tuscaloosa Alabama 35487 USA Center for Information Technology (MINT) The University of Alabama Alabama 35487 USA Natural Sciences Institute Graduate Program in Physics – Federal University of Para Belem PA 66075-110 Brazil

The interactions of adsorbates with graphene have received increasing attention due to its importance in the development of applications involving graphene-based coatings. Here, we present a study of the adsorption of noble gases on pristine and nitrogen-doped graphene. Single-layer graphene samples were synthesized by chemical vapor deposition (CVD) and transferred to transmission electron microscopy (TEM) grids. Several noble gases were allowed to adsorb on the suspended graphene substrate at very low temperatures. Raman spectra show distinct frequency blue shifts in both the 2D and G bands, which are induced by gas adsorption onto high quality single layer graphene (1LG). These shifts, which we associate with compressive biaxial strain in the graphene layers induced by the noble gases, are negligible for nitrogen-doped graphene. Additionally, a thermal depinning transition, which is related to the desorption of a noble gas layer from the graphene surface at low temperatures (ranging from 20 to 35 K), was also observed at different transition temperatures for different noble gases. These transition temperatures were found to be 25 K for argon and 35 K for xenon. Moreover, we were able to obtain values for the compressive biaxial strain in graphene induced by the adsorbed layer of noble gases, using Raman spectroscopy. Ab initio calculations confirmed the correlation between the noble gas-induced strain and the changes in the Raman features observed.

关键词： Adsorption Physisorption Surface & interfacial phenomena Graphene Density functional theory High-resolution transmission electron microscopy Raman spectroscopy

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Search for Gravitational Waves Associated with Fast Radio Bursts Detected by CHIME/FRB during the LIGO-Virgo Observing Run O3a

引用

Astrophysical Journal 2023年第2期955卷 155-155页

作者： Abbott, R. Abbott, T.D. Acernese, F. Ackley, K. Adams, C. Adhikari, N. Adhikari, R.X. Adya, V.B. Affeldt, C. Agarwal, D. Agathos, M. Agatsuma, K. Aggarwal, N. Aguiar, O.D. Aiello, L. Ain, A. Ajith, P. Akutsu, T. Albanesi, S. Allocca, A. Altin, P.A. Amato, A. Anand, C. Anand, S. Ananyeva, A. Anderson, S.B. Anderson, W.G. Ando, M. Andrade, T. Andres, N. Andrić, T. Angelova, S.V. Ansoldi, S. Antelis, J.M. Antier, S. Appert, S. Arai, Koya Arai, Y. Araki, S. Araya, A. Araya, M.C. Areeda, J.S. Arène, M. Aritomi, N. Arnaud, N. Aronson, S.M. Arun, K.G. Asada, H. Asali, Y. Ashton, G. Aso, Y. Assiduo, M. Aston, S.M. Astone, P. Aubin, F. Austin, C. Babak, S. Badaracco, F. Bader, M.K.M. Badger, C. Bae, S. Bae, Y. Baer, A.M. Bagnasco, S. Bai, Y. Baiotti, L. Baird, J. Bajpai, R. Ball, M. Ballardin, G. Ballmer, S.W. Balsamo, A. Baltus, G. Banagiri, S. Bankar, D. Barayoga, J.C. Barbieri, C. Barish, B.C. Barker, D. Barneo, P. Barone, F. Barr, B. Barsotti, L. Barsuglia, M. Barta, D. Bartlett, J. Barton, M.A. Bartos, I. Bassiri, R. Basti, A. Bawaj, M. Bayley, J.C. Baylor, A.C. Bazzan, M. Bécsy, B. Bedakihale, V.M. Bejger, M. Belahcene, I. Benedetto, V. Beniwal, D. Bennett, T.F. Bentley, J.D. BenYaala, M. Bergamin, F. Berger, B.K. Bernuzzi, S. Berry, C.P.L. Bersanetti, D. Bertolini, A. Betzwieser, J. Beveridge, D. Bhandare, R. Bhardwaj, U. Bhattacharjee, D. Bhaumik, S. Bilenko, I.A. Billingsley, G. Bini, S. Birney, R. Birnholtz, O. Biscans, S. Bischi, M. Biscoveanu, S. Bisht, A. Biswas, B. Bitossi, M. Bizouard, M.-A. Blackburn, J.K. Blair, C.D. Blair, D.G. Blair, R.M. Bobba, F. Bode, N. Boer, M. Bogaert, G. Boldrini, M. Bonavena, L.D. Bondu, F. Bonilla, E. Bonnand, R. Booker, P. Boom, B.A. Bork, R. Boschi, V. Bose, N. Bose, S. Bossilkov, V. Boudart, V. Bouffanais, Y. Boumerdassi, A. Bozzi, A. Bradaschia, C. Brady, P.R. Bramley, A. Branch, A. Branchesi, M. Brau, J.E. Breschi, M. Briant, T. Briggs, J.H. Brillet, A. Brinkmann, M. Brockill, P. Brooks, A.F. Brooks, J. Brown, D.D. Brunett, S. Bruno, G. Bruntz, R. Bryant, J. Buchanan, J. B LIGO Laboratory California Institute of Technology Pasadena 91125 CA United States Louisiana State University Baton Rouge 70803 LA United States Dipartimento di Farmacia Università di Salerno Fisciano Salerno I-84084 Italy INFN Sezione di Napoli Complesso Universitario di Monte S. Angelo Napoli I-80126 Italy OzGrav School of Physics & Astronomy Monash University Clayton 3800 VIC Australia LIGO Livingston Observatory Livingston 70754 LA United States University of Wisconsin-Milwaukee Milwaukee 53201 WI United States OzGrav Australian National University Canberra 0200 ACT Australia Max Planck Institute for Gravitational Physics (Albert Einstein Institute) Hannover D-30167 Germany Leibniz Universität Hannover Hannover D-30167 Germany Inter-University Centre for Astronomy and Astrophysics Pune 411007 India University of Cambridge Cambridge CB2 1TN United Kingdom Theoretisch-Physikalisches Institut Friedrich-Schiller-Universität Jena Jena D-07743 Germany University of Birmingham Birmingham B15 2TT United Kingdom Center for Interdisciplinary Exploration & Research in Astrophysics (CIERA) Northwestern University Evanston 60208 IL United States Instituto Nacional de Pesquisas Espaciais São Paulo São José dos Campos 12227-010 Brazil Gravity Exploration Institute Cardiff University Cardiff CF24 3AA United Kingdom INFN Sezione di Pisa Pisa I-56127 Italy International Centre for Theoretical Sciences Tata Institute of Fundamental Research Bengaluru 560089 India Gravitational Wave Science Project National Astronomical Observatory of Japan (NAOJ) Mitaka City Tokyo 181-8588 Japan Advanced Technology Center National Astronomical Observatory of Japan (NAOJ) Mitaka City Tokyo 181-8588 Japan INFN Sezione di Torino Torino I-10125 Italy Università di Napoli “Federico II Complesso Universitario di Monte S. Angelo Napoli I-80126 Italy Université de Lyon Université Claude Bernard Lyon 1 CNRS Institut Lumière Matière Villeurbanne F-69622

We search for gravitational-wave (GW) transients associated with fast radio bursts (FRBs) detected by the Canadian Hydrogen Intensity Mapping Experiment Fast Radio Burst Project, during the first part of the third observing run of Advanced LIGO and Advanced Virgo (2019 April 1 15:00 UTC-2019 October 1 15:00 UTC). Triggers from 22 FRBs were analyzed with a search that targets both binary neutron star (BNS) and neutron star-black hole (NSBH) mergers. A targeted search for generic GW transients was conducted on 40 FRBs. We find no significant evidence for a GW association in either search. Given the large uncertainties in the distances of our FRB sample, we are unable to exclude the possibility of a GW association. Assessing the volumetric event rates of both FRB and binary mergers, an association is limited to 15% of the FRB population for BNS mergers or 1% for NSBH mergers. We report 90% confidence lower bounds on the distance to each FRB for a range of GW progenitor models and set upper limits on the energy emitted through GWs for a range of emission scenarios. We find values of order 10⁵¹-10⁵⁷ erg for models with central GW frequencies in the range 70-3560 Hz. At the sensitivity of this search, we find these limits to be above the predicted GW emissions for the models considered. We also find no significant coincident detection of GWs with the repeater, FRB 20200120E, which is the closest known extragalactic FRB. © 2023. The Author(s). Published by the American Astronomical Society.

关键词： Gravitational wave astronomy Radio transient sources

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Water Splitting: Creation of 3D Textured Graphene/Si Schottky Junction Photocathode for Enhanced Photo‐Electrochemical Efficiency and Stability (Adv. Energy Mater. 29/2019)

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Advanced Energy materials 2019年第29期9卷

作者： Che‐Kuei Ku Po‐Hsien Wu Cheng‐Chu Chung Chun‐Chi Chen Kai‐Jie Tsai Hung‐Ming Chen Yu‐Cheng Chang Cheng‐Hao Chuang Chuan‐Yu Wei Cheng‐Yen Wen Tzu‐Yao Lin Hsuen‐Li Chen Yen‐Shang Wang Zhe‐Yu Lee Jun‐Ru Chang Chih‐Wei Luo Di‐Yan Wang Bing Joe Hwang Chun‐Wei Chen Department of Materials Science and Engineering National Taiwan University Taipei 10617 Taiwan Department of Chemical Engineering National Taiwan University of Science and Technology Taipei 106 Taiwan Gingen Technology Co. Ltd New Taipei City 11054 Taiwan Department of Physics Tamkang University Tamsui 25137 Taiwan Department of Electrophysics National Chiao Tung University No. 1001 University Rd. Hsinchu 300 Taiwan Department of Chemistry Tunghai University Taichung 40704 Taiwan Center for Nanoscience and Technology Tunghai University Taichung 40704 Taiwan National Synchrotron Radiation Research Center Hsinchu 30076 Taiwan Center of Atomic Initiative for New Materials (AI‐MAT) National Taiwan University Taipei 10617 Taiwan International Graduate Program of Molecular Science and Technology National Taiwan University (NTU‐MST) Taipei 10617 Taiwan

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Silicon waveguide modulator with embedded phase change material

arXiv

引用

arXiv 2017年

作者： Miller, Kevin J. Hallman, Kent A. Haglund, Richard F. Weiss, Sharon M. Interdisciplinary Graduate Program in Materials Science Vanderbilt University NashvilleTN37235 United States Department of Physics and Astronomy Vanderbilt University NashvilleTN37235 United States Department of Electrical Engineering and Computer Science Vanderbilt University NashvilleTN37235 United States

Phase-change materials (PCMs) have emerged as promising active elements in silicon (Si) photonic systems. In this work, we design, fabricate, and characterize a hybrid Si-PCM optical modulator. By integrating vanadium dioxide (a PCM) within a Si photonic waveguide, in a non-resonant geometry, we demonstrate ~ 10 dB broadband modulation with a PCM length of 500 nm. Copyright © 2017, The Authors. All rights reserved.

关键词： Phase change materials

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Designing a Perylene Diimide/Fullerene Hybrid as Effective Electron Transporting Material in Inverted Perovskite Solar Cells with Enhanced Efficiency and Stability

引用

Angewandte Chemie 2019年第25期131卷

作者： Zhenghui Luo Fei Wu Teng Zhang Xuan Zeng Yiqun Xiao Tao Liu Cheng Zhong Xinhui Lu Linna Zhu Shihe Yang Chuluo Yang Hubei Key Lab on Organic and Polymeric Optoelectronic Materials Department of Chemistry Wuhan University Wuhan 430072 P. R. China Shenzhen Key Laboratory of Polymer Science and Technology College of Materials Science and Engineering Shenzhen University Shenzhen 518060 P. R. China Chongqing Key Laboratory for Advanced Materials and Technologies of Clean Energy Faculty of Materials & Energy Southwest University Chongqing 400715 P. R. China Nano Science and Technology Program Department of Chemistry The Hong Kong University of Science and Technology Clear Water Bay Kowloon Hong Kong P. R. China Department of Physics Chinese University of Hong Kong New Territories Hong Kong P. R. China Guangdong Key Lab of Nano-Micro Material Research School of Chemical Biology and Biotechnology Shenzhen Graduate School Peking University Xili University Town Shenzhen 518055 Guangdong P. R.China

Electron transport materials (ETM) play an important role in the improvement of efficiency and stability for inverted perovskite solar cells (PSCs). This work reports an efficient ETM, named PDI‐C 60 , by the combination of perylene diimide (PDI) and fullerene. Compared to the traditional PCBM, this strategy endows PDI‐C 60 with slightly shallower energy level and higher electron mobility. As a result, the device based on PDI‐C 60 as electron transport layer (ETL) achieves high power conversion efficiency (PCE) of 18.6 %, which is significantly higher than those of the control devices of PCBM (16.6 %) and PDI (13.8 %). The high PCE of the PDI‐C 60 ‐based device can be attributed to the more matching energy level with the perovskite, more efficient charge extraction, transport, and reduced recombination rate. To the best of our knowledge, the PCE of 18.6 % is the highest value in the PSCs using PDI derivatives as ETLs. Moreover, the device with PDI‐C 60 as ETL exhibits better device stability due to the stronger hydrophobic properties of PDI‐C 60 . The strategy using the PDI/fullerene hybrid provides insights for future molecular design of the efficient ETM for the inverted PSCs.

关键词： Elektronentransportmaterial Fullerene Perowskit-Solarzellen Perylendiimide Stromwandlungswirkungsgrad

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Numerical evaluation of the pressure drop in multiphase flow of the catenary riser with the presence of leakage

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Defect and Diffusion Forum 2016年 366卷 157-165页

作者： De Almeida Tavares, Daniela Passos Simões Sarmento, Lígia Rafaely Barbosa Barbosa, Enivaldo Santos De Farias Neto, Severino Rodrigues De Lima, Antonio Gilson Barbosa Federal University of Campina Grande Center of Science and Technology Post Graduate Program in Chemical Engineering Campina GrandeParaíba58429-900 Brazil Federal University of Campina Grande Center of Science and Technology Petroleum Engineering Department Campina GrandeParaíba58429-900 Brazil Federal University of Campina Grande Center of Science and Technology Mechanical Engineering Department Campina GrandeParaíba58429-900 Brazil

The growing demand for oil brings the need for discovery of deeper reservoirs, especially of ultra-deepwater reservoirs. Thus, production in marine systems using components such as risers (flexible or rigid pipes) has been the focus of many studies in different areas. These ducts are used in the transportation of multiphase fluids (oil, water and gas) produced from the oil well located on the seabed to the platform surface. Due to the extreme conditions present in the offshore fields of production, the equipments that transport produced fluids operate close to their limits. So eventually, the flexible pipes may have structural integrity faults like leaks, which can cause production losses, accidents with victims and environmental disasters. The leak depends of a number of properties or parameters measured at the site of the leak, for example, integrity of the pipe material, release of fluids and noise emission characteristics or manifestation of some other type of signal behavior, variation of pressure drops close to the leak, among others. There are a variety of techniques available for detecting leaks, among which there is the mathematical modeling approach using computational techniques. In this context, this paper aims to study the fluid dynamics of a transient multiphase flow in a catenary riser in the presence of leakage. Herein a 3D Eulerian-Eulerian model was applied, including the turbulent model (RNG k-ϵ), using the commercial package ANSYS CFX® 15 to perform all simulations. The numerical results of velocity, volume fraction and pressure of the involved phases are presented and discussed. © 2016 Trans Tech Publications.

关键词： Drops

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