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Behaviors of stem cells on carbon nanotube

Biomaterials Research 2015年第1期19卷 1-6页

作者： Lee, Ju-Ro Ryu, Seungmi Kim, Soojin Kim, Byung-Soo School of Chemical and Biological Engineering Seoul National University Seoul 151-744 South Korea Interdisciplinary Program for Bioengineering Seoul National University Seoul 151-744 South Korea Department of Biomedical Engineering University of Alabama at Birmingham Birmingham AL United States

Regulating stem cell microenvironment is one of the essential elements in stem cell culture. Recently, carbon nanotube (CNT) has come into the spotlight as a biomaterial that retains unique properties. Based on its high chemical stability, elasticity, mechanical strength, and electrical conductivity, CNT shows great potential as an application for biomedical substrate. Also, properties of CNT could be further regulated by appropriate chemical modifications of CNT. Recent studies reported that modulating the cellular microenvironment through the use of CNT and chemically modified CNT as cell culture substrates can affect proliferation and differentiation of various types of stem cells. This review summarizes the unique biological effects of CNT on stem cells. © 2015 Lee et al.

关键词： Carbon nanotube Differentiation Stem cell Substrate

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Analysis of more than 400,000 women provides case-control evidence for BRCA1 and BRCA2 variant classification

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Nature communications 2025年第1期16卷 4852页

作者： Maria Zanti Denise G O'Mahony Michael T Parsons Leila Dorling Joe Dennis Nicholas J Boddicker Wenan Chen Chunling Hu Marc Naven Kristia Yiangou Thomas U Ahearn Christine B Ambrosone Irene L Andrulis Antonis C Antoniou Paul L Auer Caroline Baynes Clara Bodelon Natalia V Bogdanova Stig E Bojesen Manjeet K Bolla Kristen D Brantley Nicola J Camp Archie Campbell Jose E Castelao Melissa H Cessna Jenny Chang-Claude Fei Chen Georgia Chenevix-Trench Don M Conroy Kamila Czene Arcangela De Nicolo Susan M Domchek Thilo Dörk Alison M Dunning A Heather Eliassen D Gareth Evans Peter A Fasching Jonine D Figueroa Henrik Flyger Manuela Gago-Dominguez Montserrat García-Closas Gord Glendon Anna González-Neira Felix Grassmann Andreas Hadjisavvas Christopher A Haiman Ute Hamann Steven N Hart Mikael B A Hartman Weang-Kee Ho James M Hodge Reiner Hoppe Sacha J Howell Anna Jakubowska Elza K Khusnutdinova Yon-Dschun Ko Peter Kraft Vessela N Kristensen James V Lacey Jingmei Li Geok Hoon Lim Sara Lindström Artitaya Lophatananon Craig Luccarini Arto Mannermaa Maria Elena Martinez Dimitrios Mavroudis Roger L Milne Kenneth Muir Katherine L Nathanson Rocio Nuñez-Torres Nadia Obi Janet E Olson Julie R Palmer Mihalis I Panayiotidis Alpa V Patel Paul D P Pharoah Eric C Polley Muhammad U Rashid Kathryn J Ruddy Emmanouil Saloustros Elinor J Sawyer Marjanka K Schmidt Melissa C Southey Veronique Kiak-Mien Tan Soo Hwang Teo Lauren R Teras Diana Torres Amy Trentham-Dietz Thérèse Truong Celine M Vachon Qin Wang Jeffrey N Weitzel Siddhartha Yadav Song Yao Gary R Zirpoli Melissa S Cline Peter Devilee Sean V Tavtigian David E Goldgar Fergus J Couch Douglas F Easton Amanda B Spurdle Kyriaki Michailidou Biostatistics Unit The Cyprus Institute of Neurology & Genetics Nicosia Cyprus. Department of Medical Genetics Oslo University Hospital Oslo Norway. Population Health Program QIMR Berghofer Medical Research Institute Brisbane Queensland Australia. Centre for Cancer Genetic Epidemiology Department of Public Health and Primary Care University of Cambridge Cambridge UK. Department of Quantitative Health Sciences Division of Computational Biology Mayo Clinic Rochester MN USA. Department of Laboratory Medicine and Pathology Mayo Clinic Rochester MN USA. Division of Cancer Epidemiology and Genetics National Cancer Institute National Institutes of Health Department of Health and Human Services Bethesda MD USA. Department of Cancer Prevention and Control Roswell Park Comprehensive Cancer Institute Buffalo NY USA. Fred A. Litwin Center for Cancer Genetics Lunenfeld-Tanenbaum Research Institute of Mount Sinai Hospital Toronto Ontario Canada. Department of Molecular Genetics University of Toronto Toronto Ontario Canada. Division of Biostatistics Data Science Institute and Cancer Center Medical College of Wisconsin Milwaukee WI USA. Centre for Cancer Genetic Epidemiology Department of Oncology University of Cambridge Cambridge UK. Department of Population Science American Cancer Society Atlanta GA USA. Radiation Oncology Research Unit Hannover Medical School Hannover Germany. Copenhagen General Population Study Herlev and Gentofte Hospital Copenhagen University Hospital Herlev Denmark. Department of Clinical Biochemistry Herlev and Gentofte Hospital Copenhagen University Hospital Herlev Denmark. Faculty of Health and Medical Sciences University of Copenhagen Copenhagen Denmark. Department of Medical Oncology Dana-Farber Cancer Institute Boston MA USA. Department of Internal Medicine and Huntsman Cancer Institute University of Utah Salt Lake City UT USA. Centre for Genomic and Experimental Medicine Institute of Genetics & Cancer The University of Ed

Clinical genetic testing identifies variants causal for hereditary cancer, information that is used for risk assessment and clinical management. Unfortunately, some variants identified are of uncertain clinical significance (VUS), complicating patient management. Case-control data is one evidence type used to classify VUS. As an initiative of the Evidence-based Network for the Interpretation of Germline Mutant Alleles (ENIGMA) Analytical Working Group we analyze germline sequencing data of BRCA1 and BRCA2 from 96,691 female breast cancer cases and 302,116 controls from three studies: the BRIDGES study of the Breast Cancer Association Consortium, the Cancer Risk Estimates Related to Susceptibility consortium, and the UK Biobank. We observe 11,207 BRCA1 and BRCA2 variants, with 6909 being coding, covering 23.4% of BRCA1 and BRCA2 VUS in ClinVar and 19.2% of ClinVar curated (likely) benign or pathogenic variants. Case-control likelihood ratio (ccLR) evidence is highly consistent with ClinVar assertions for (likely) benign or pathogenic variants; exhibiting 99.1% sensitivity and 95.3% specificity for BRCA1 and 93.3% sensitivity and 86.6% specificity for BRCA2. This approach provides case-control evidence for 787 unclassified variants; these include 579 with strong or moderate benign evidence and 10 with strong pathogenic evidence for which ccLR evidence is sufficient to alter clinical classification.

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Pomelo (Citrus maxima) peel-inspired property for development of eco-friendly loose-fill foam 8th

Pomelo (Citrus maxima) peel-inspired property for developmen...

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8th International Conference on Materials Science and Technology, MSAT 2014

作者： Looyrach, Jarawee Methacanon, Pawadee Gamonpilas, Chaiwut Lekpittaya, Porntip Lertworasirikul, Amornrat Interdisciplinary Graduate Program in Advanced and Sustainable Environmental Engineering Faculty of Engineering Kasetsart University Bangkok10900 Thailand National Metal and Materials Technology Center 114 Paholyothin Rd. Klong 1 Klong Luang Pathumthani12120 Thailand Department of Materials Engineering Faculty of Engineering Kasetsart University Bangkok10900 Thailand

ISBN: (纸本)9783038355526

For development of eco-friendly packaging foam from pomelo peel, physical and mechanical properties of the pomelo peel and effects of pomelo varieties, namely Kao-Nampueng, Thong-Dee, and Kao-Pan, on their properties were investigated. It was found that the pomelo variety showed somewhat significant effect on physical and mechanical of pomelo peel properties. Because of its thick peel with high moisture content (75-80%) and water activity (0.90-0.98), the peel weight accounted for almost half of the total fruit weight. Cell structure and pore size of the peel were examined using the environmental scanning electron microscope (ESEM). The result showed an open cell foam structure with pore size of approximately 151±31 μm. The pore size was more open and large towards the outer surface. Uniaxial compression tests on pomelo peel samples with and without flavedo showed good reproducible stress-strain curves despite its biological variation. Young's moduli of both samples were calculated to be 200-300 kPa and 110-210 kPa, respectively. Moreover, the most important property of packaging foam is the ability to absorb energy during impact which can be characterised through the measurement of the onset strain of densification. It was found that the strain values at the maximum energy absorption efficiency (Εcd) of peel samples with and without flavedo for all studied pomelo varieties were comparable and were approximately in the range of 60-65%. These preliminary results indicate very promising mechanical properties of pomelo peel as eco-friendly packaging foam although further modifications are required to improve their physical and shelf-stability properties. © (2015).

关键词： Scanning electron microscopy

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EEG channels reduction using PCA to increase XGBoost’s accuracy for stroke detection

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AIP Conference Proceedings 2017年第1期1862卷

作者： N. Fitriah S. K. Wijaya M. I. Fanany C. Badri M. Rezal 1Biomedical Engineering Study Program Universitas Indonesia Jl. Salemba Raya No. 4 Jakarta 10430 DKI Jakarta Indonesia 2Department of Physics Faculty of Mathematics and Natural Sciences (FMIPA) Universitas Indonesia Depok 16424 Indonesia 3Faculty of Computer Science Universitas Indonesia Depok 16424 Indonesia

In Indonesia, based on the result of Basic Health Research 2013, the number of stroke patients had increased from 8.3 ‰ (2007) to 12.1 ‰ (2013). These days, some researchers are using electroencephalography (EEG) result as another option to detect the stroke disease besides CT Scan image as the gold standard. A previous study on the data of stroke and healthy patients in National Brain Center Hospital (RS PON) used Brain Symmetry Index (BSI), Delta-Alpha Ratio (DAR), and Delta-Theta-Alpha-Beta Ratio (DTABR) as the features for classification by an Extreme Learning Machine (ELM). The study got 85% accuracy with sensitivity above 86 % for acute ischemic stroke detection. Using EEG data means dealing with many data dimensions, and it can reduce the accuracy of classifier (the curse of dimensionality). Principal Component Analysis (PCA) could reduce dimensionality and computation cost without decreasing classification accuracy. XGBoost, as the scalable tree boosting classifier, can solve real-world scale problems (Higgs Boson and Allstate dataset) with using a minimal amount of resources. This paper reuses the same data from RS PON and features from previous research, preprocessed with PCA and classified with XGBoost, to increase the accuracy with fewer electrodes. The specific fewer electrodes improved the accuracy of stroke detection. Our future work will examine the other algorithm besides PCA to get higher accuracy with less number of channels.

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Endoscopic Camera Manipulation planning of a surgical robot using Rapidly-Exploring Random Tree algorithm 15

Endoscopic Camera Manipulation planning of a surgical robot ...

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15th International Conference on Control, Automation and Systems, ICCAS 2015

作者： Park, Jae-Hyeon Park, Woo Jung Lee, Chiwon Kim, Myungjoon Kim, Sungwan Kim, H. Jin Department of Aerospace Engineering Seoul National University Seoul Korea Republic of Interdisciplinary Program for Bioengineering College of Engineering Seoul National University Korea Republic of Department of Biomedical Engineering Seoul National University College of Medicine Korea Republic of Institute of Medical and Biological Engineering Seoul National University Seoul Korea Republic of

ISBN: (纸本)9788993215090

In this paper, we propose an automatized Endoscopic Camera Manipulator (ECM) system for da Vinci surgical robot system to relieve surgeon's load in surgery. We also perform a simulation of the ECM motion planning as a basic step for automatized ECM system. We can obtain the motion trajectories of the ECM that make end effector of the ECM to reach a desired target position. We consider the ECM as a four-joint robot arm system and use the RRT (Rapidly-Exploring Random Tree) planning algorithm for this high order joint system. The simulation works properly and it will be helpful in proceeding further research. © 2015 Institute of Control, Robotics and Systems - ICROS.

关键词： Manipulators

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Discovery of rare variants associated with blood pressure regulation through meta-analysis of 1.3 million individuals (vol 52, pg 1314, 2020)

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NATURE GENETICS 2021年第5期53卷 762-762页

作者： Surendran, Praveen Feofanova, Elena V. Lahrouchi, Najim Ntalla, Ioanna Karthikeyan, Savita Cook, James Chen, Lingyan Mifsud, Borbala Yao, Chen Kraja, Aldi T. Cartwright, James H. Hellwege, Jacklyn N. Giri, Ayush Tragante, Vinicius Thorleifsson, Gudmar Liu, Dajiang J. Prins, Bram P. Stewart, Isobel D. Cabrera, Claudia P. Eales, James M. Akbarov, Artur Auer, Paul L. Bielak, Lawrence F. Bis, Joshua C. Braithwaite, Vickie S. Brody, Jennifer A. Daw, E. Warwick Warren, Helen R. Drenos, Fotios Nielsen, Sune Fallgaard Faul, Jessica D. Fauman, Eric B. Fava, Cristiano Ferreira, Teresa Foley, Christopher N. Franceschini, Nora Gao, He Giannakopoulou, Olga Giulianini, Franco Gudbjartsson, Daniel F. Guo, Xiuqing Harris, Sarah E. Havulinna, Aki S. Helgadottir, Anna Huffman, Jennifer E. Hwang, Shih-Jen Kanoni, Stavroula Kontto, Jukka Larson, Martin G. Li-Gao, Ruifang Lindstrom, Jaana Lotta, Luca A. Lu, Yingchang Luan, Jian'an Mahajan, Anubha Malerba, Giovanni Masca, Nicholas G. D. Mei, Hao Menni, Cristina Mook-Kanamori, Dennis O. Mosen-Ansorena, David Muller-Nurasyid, Martina Pare, Guillaume Paul, Dirk S. Perola, Markus Poveda, Alaitz Rauramaa, Rainer Richard, Melissa Richardson, Tom G. Sepulveda, Nuno Sim, Xueling Smith, Albert V. Smith, Jennifer A. Staley, James R. Stanakova, Alena Sulem, Patrick Theriault, Sebastien Thorsteinsdottir, Unnur Trompet, Stella Varga, Tibor V. Velez Edwards, Digna R. Veronesi, Giovanni Weiss, Stefan Willems, Sara M. Yao, Jie Young, Robin Yu, Bing Zhang, Weihua Zhao, Jing-Hua Zhao, Wei Zhao, Wei Evangelou, Evangelos Aeschbacher, Stefanie Asllanaj, Eralda Blankenberg, Stefan Bonnycastle, Lori L. Bork-Jensen, Jette Brandslund, Ivan Braund, Peter S. Burgess, Stephen Cho, Kelly Christensen, Cramer Connell, John de Mutsert, Renee Dominiczak, Anna F. Dorr, Marcus Eiriksdottir, Gudny Farmaki, Aliki-Eleni Gaziano, J. Michael Grarup, Niels Grove, Megan L. Hallmans, Goran Hansen, Torben Have, Christian T. Heiss, Gerardo Jorgensen, Marit E. Jousilahti, Pekka Kajantie, Eero Kamat, Mihir Karajamaki, AnneMari Kar British Heart Foundation Cardiovascular Epidemiology Unit Department of Public Health and Primary Care University of Cambridge Cambridge UK British Heart Foundation Centre of Research Excellence University of Cambridge Cambridge UK Health Data Research UK Cambridge Wellcome Genome Campus and University of Cambridge Cambridge UK Rutherford Fund Fellow Department of Public Health and Primary Care University of Cambridge Cambridge UK MRC Biostatistics Unit University of Cambridge Cambridge UK National Institute for Health Research Cambridge Biomedical Research Centre University of Cambridge and Cambridge University Hospitals Cambridge UK MRC Integrative Epidemiology Unit (IEU) Population Health Sciences Bristol Medical School University of Bristol Bristol UK Robertson Centre for Biostatistics University of Glasgow Glasgow UK MRC Epidemiology Unit University of Cambridge School of Clinical Medicine Cambridge UK Department of Immunology and Inflammation Imperial College London London UK Centre for Non-communicable Disease Research (CNCR) Dhaka Bangladesh National Institute for Health Research (NIHR) Blood and Transplant Research Unit (BTRU) in Donor Health and Genomics at the University of Cambridge Cambridge UK Department of Human Genetics Wellcome Sanger Institute Wellcome Genome Campus Hinxton Cambridge UK Department of Biostatistics and Epidemiology Perelman School of Medicine University of Pennsylvania Philadelphia PA USA Center for Non-Communicable Diseases Karachi Pakistan Department of Genetics Novo Nordisk Research Centre Oxford Oxford UK Human Genetics Center Department of Epidemiology Human Genetics and Environmental Sciences School of Public Health University of Texas Health Science Center at Houston Houston TX USA Human Genome Sequencing Center Baylor College of Medicine Houston TX USA Program in Medical and Population Genetics Broad Institute of Harvard and MIT Cambridge MA USA Cardiovascular Research Center Center for Genomic Medicine

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Publisher Correction: On the issue of transparency and reproducibility in nanomedicine

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Nature nanotechnology 2019年第8期14卷 811页

作者： Hon S Leong Kimberly S Butler C Jeffrey Brinker May Azzawi Steve Conlan Christine Dufès Andrew Owen Steve Rannard Chris Scott Chunying Chen Marina A Dobrovolskaia Serguei V Kozlov Adriele Prina-Mello Ruth Schmid Peter Wick Fanny Caputo Patrick Boisseau Rachael M Crist Scott E McNeil Bengt Fadeel Lang Tran Steffen Foss Hansen Nanna B Hartmann Lauge P W Clausen Lars M Skjolding Anders Baun Marlene Ågerstrand Zhen Gu Dimitrios A Lamprou Clare Hoskins Leaf Huang Wantong Song Huiliang Cao Xuanyong Liu Klaus D Jandt Wen Jiang Betty Y S Kim Korin E Wheeler Andrew J Chetwynd Iseult Lynch Sayed Moein Moghimi André Nel Tian Xia Paul S Weiss Bruno Sarmento José das Neves Hélder A Santos Luis Santos Samir Mitragotri Steve Little Dan Peer Mansoor M Amiji Maria José Alonso Alke Petri-Fink Sandor Balog Aaron Lee Barbara Drasler Barbara Rothen-Rutishauser Stefan Wilhelm Handan Acar Roger G Harrison Chuanbin Mao Priyabrata Mukherjee Rajagopal Ramesh Lacey R McNally Sara Busatto Joy Wolfram Paolo Bergese Mauro Ferrari Ronnie H Fang Liangfang Zhang Jie Zheng Chuanqi Peng Bujie Du Mengxiao Yu Danielle M Charron Gang Zheng Chiara Pastore Department of Urology Mayo Clinic Rochester MN USA. Department of Physiology and Biomedical Engineering Mayo Clinic Rochester MN USA. Department of Nanobiology Sandia National Laboratories Albuquerque NM USA. Center for Micro-Engineered Materials University of New Mexico Albuquerque Albuquerque NM USA. Departments of Chemical and Biological Engineering University of New Mexico Albuquerque NM USA. Department of Molecular Genetics and Microbiology University of New Mexico Albuquerque NM USA. UNM Comprehensive Cancer Center University of New Mexico Albuquerque NM USA. Cardiovascular Research Group School of Healthcare Science Manchester Metropolitan University Manchester UK. British Society for Nanomedicine Liverpool UK. Institute of Life Science Swansea University Medical School Swansea University Swansea UK. Strathclyde Institute of Pharmacy and Biomedical Sciences University of Strathclyde Glasgow UK. Department of Molecular and Clinical Pharmacology Institute of Translational Medicine University of Liverpool Liverpool UK. Department of Chemistry School of Physical Sciences University of Liverpool Liverpool UK. Centre for Cancer Research and Cell Biology Queen's University of Belfast Belfast UK. National Center for Nanoscience and Technology of China Beijing China. Cancer Research Technology Program Nanotechnology Characterization Laboratory Frederick National Laboratory for Cancer Research Frederick MD USA. Laboratory of Animal Sciences Program Center for Advanced Preclinical Research Frederick National Laboratory for Cancer Research Frederick National Laboratory for Cancer Research Frederick MD USA. Trinity Translational Medicine Institute Department of Clinical Medicine Trinity College Dublin Dublin Ireland. Laboratory for Biological Characterisation of Advanced Materials Trinity Translational Medicine Institute Trinity College Dublin Dublin Ireland. Nanomedicine Group Advanced Materials and Bioengineering Research (AMBER) centre Centre

An amendment to this paper has been published and can be accessed via a link at the top of the paper.

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Search for Continuous Gravitational Waves from Known Pulsars in the First Part of the Fourth LIGO-Virgo-KAGRA Observing Run

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Astrophysical Journal 2025年第2期983卷 99-99页

作者： Abac, A.G. Abbott, R. Abouelfettouh, I. Acernese, F. Ackley, K. Adhicary, S. Adhikari, N. Adhikari, R.X. Adkins, V.K. Agarwal, D. Agathos, M. Aghaei Abchouyeh, M. Aguiar, O.D. Aguilar, I. Aiello, L. Ain, A. Ajith, P. Akutsu, T. Albanesi, S. Alfaidi, R.A. Al-Jodah, A. Alléné, C. Allocca, A. Al-Shammari, S. Altin, P.A. Alvarez-Lopez, S. Amato, A. Amez-Droz, L. Amorosi, A. Amra, C. Ananyeva, A. Anderson, S.B. Anderson, W.G. Andia, M. Ando, M. Andrade, T. Andres, N. Andrés-Carcasona, M. Andrić, T. Anglin, J. Ansoldi, S. Antelis, J.M. Antier, S. Aoumi, M. Appavuravther, E.Z. Appert, S. Apple, S.K. Arai, K. Araya, A. Araya, M.C. Areeda, J.S. Argianas, L. Aritomi, N. Armato, F. Arnaud, N. Arogeti, M. Aronson, S.M. Ashton, G. Aso, Y. Assiduo, M. Assis de Souza Melo, S. Aston, S.M. Astone, P. Attadio, F. Aubin, F. AultONeal, K. Avallone, G. Babak, S. Badaracco, F. Badger, C. Bae, S. Bagnasco, S. Bagui, E. Baier, J.G. Baiotti, L. Bajpai, R. Baka, T. Ball, M. Ballardin, G. Ballmer, S.W. Banagiri, S. Banerjee, B. Bankar, D. Baral, P. Barayoga, J.C. Barish, B.C. Barker, D. Barneo, P. Barone, F. Barr, B. Barsotti, L. Barsuglia, M. Barta, D. Bartoletti, A.M. Barton, M.A. Bartos, I. Basak, S. Basalaev, A. Bassiri, R. Basti, A. Bates, D.E. Bawaj, M. Baxi, P. Bayley, J.C. Baylor, A.C. Baynard, P.A. Bazzan, M. Bedakihale, V.M. Beirnaert, F. Bejger, M. Belardinelli, D. Bell, A.S. Benedetto, V. Benoit, W. Bentley, J.D. Ben Yaala, M. Bera, S. Berbel, M. Bergamin, F. Berger, B.K. Bernuzzi, S. Beroiz, M. Bersanetti, D. Bertolini, A. Betzwieser, J. Beveridge, D. Bevins, N. Bhandare, R. Bhardwaj, U. Bhatt, R. Bhattacharjee, D. Bhaumik, S. Bhowmick, S. Bianchi, A. Bilenko, I.A. Billingsley, G. Binetti, A. Bini, S. Birnholtz, O. Biscoveanu, S. Bisht, A. Bitossi, M. Bizouard, M.-A. Blackburn, J.K. Blagg, L.A. Blair, C.D. Blair, D.G. Bobba, F. Bode, N. Boileau, G. Boldrini, M. Bolingbroke, G.N. Bolliand, A. Bonavena, L.D. Bondarescu, R. Bondu, F. Bonilla, E. Bonilla, M.S. Bonino, A. Bonnand, R. Booker, P. Borchers, A. Boschi, V. Bose, S. Boss Max Planck Institute for Gravitational Physics (Albert Einstein Institute) Potsdam D-14476 Germany LIGO Laboratory California Institute of Technology Pasadena 91125 CA United States LIGO Hanford Observatory Richland 99352 WA United States Dipartimento di Farmacia Università di Salerno Fisciano Salerno I-84084 Italy INFN Sezione di Napoli Napoli I-80126 Italy University of Warwick Coventry CV 47AL United Kingdom The Pennsylvania State University University Park 16802 PA United States University of Wisconsin-Milwaukee Milwaukee 53201 WI United States Louisiana State University Baton Rouge 70803 LA United States Université Catholique de Louvain Louvain-la-Neuve B-1348 Belgium Inter-University Centre for Astronomy and Astrophysics Pune 411007 India Queen Mary University of London London E1 4NS United Kingdom Department of Physics and Astronomy Sejong University 209 Neungdong-ro Gwangjin-gu Seoul 143-747 South Korea Instituto Nacional de Pesquisas Espaciais São José dos Campos São Paulo 12227-010 Brazil Stanford University Stanford 94305 CA United States Università di Roma Tor Vergata Roma I-00133 Italy INFN Sezione di Roma Tor Vergata Roma I-00133 Italy Cardiff University Cardiff CF24 3AA United Kingdom Universiteit Antwerpen Antwerpen 2000 Belgium International Centre for Theoretical Sciences Tata Institute of Fundamental Research Bengaluru 560089 India Gravitational Wave Science Project National Astronomical Observatory of Japan 2-21-1 Osawa Mitaka City Tokyo 181-8588 Japan Advanced Technology Center National Astronomical Observatory of Japan 2-21-1 Osawa Mitaka City Tokyo 181-8588 Japan INFN Sezione di Torino Torino I-10125 Italy Theoretisch-Physikalisches Institut Friedrich-Schiller-Universität Jena Jena D-07743 Germany Dipartimento di Fisica Università degli Studi di Torino Torino I-10125 Italy SUPA University of Glasgow Glasgow G12 8QQ United Kingdom OzGrav University of Western Australia Crawley 6009 WA

Continuous gravitational waves (CWs) emission from neutron stars carries information about their internal structure and equation of state, and it can provide tests of general relativity. We present a search for CWs from a set of 45 known pulsars in the first part of the fourth LIGO-Virgo-KAGRA observing run, known as O4a. We conducted a targeted search for each pulsar using three independent analysis methods considering single-harmonic and dual-harmonic emission models. We find no evidence of a CW signal in O4a data for both models and set upper limits on the signal amplitude and on the ellipticity, which quantifies the asymmetry in the neutron star mass distribution. For the single-harmonic emission model, 29 targets have the upper limit on the amplitude below the theoretical spin-down limit. The lowest upper limit on the amplitude is 6.4 × 10^-27 for the young energetic pulsar J0537-6910, while the lowest constraint on the ellipticity is 8.8 × 10^-9 for the bright nearby millisecond pulsar J0437-4715. Additionally, for a subset of 16 targets, we performed a narrowband search that is more robust regarding the emission model, with no evidence of a signal. We also found no evidence of nonstandard polarizations as predicted by the Brans-Dicke theory. © 2025. The Author(s). Published by the American Astronomical Society.

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Amplitude-integrated EEG Processing and its Performance for Automatic Seizure Detection

Amplitude-integrated EEG Processing and its Performance for ...

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IEEE International Conference on Signal and Image Processing Applications

作者： Chavin Satirasethawong Apiwat Lek-uthai Krisnachai Chomtho Biomedical Engineering Program Faculty of Engineering Department of Electrical Engineering Faculty of Engineering Department of Pediatrics Faculty of Medicine Chulalongkorn University Bangkok Thailand

ISBN: (纸本)9781479989973

Amplitude-integrated EEG (aEEG) is an easy-to-use screening tool for monitoring electrical seizures which is widely used in hospitals nowadays. The purpose of this paper is to develop the process for creating aEEG in details and to present an algorithm for a single-channel automatic seizure detection. To create an aEEG signal, a raw EEG signal was passed through a band-pass filter, peak-to-peak rectification, smoothing, semilogarithmic compression and time compression. The processed signal was qualitatively evaluated by widely used commercial software. The algorithm was developed based on statistic methods and tested with CHB-MIT Scalp EEG Database in order to detect seizures which last longer than 50 seconds (total 85 seizures with annotations in 683 EDF files) from a single selected channel of each data record which has maximum amplitude in ictal period. The performance measurement showed average sensitivity of 88.50% (33.33-100.00%), false detection rate of 0.18 (0.00-0.58) false positives per hour and the percentage of false detection duration of 0.34% (0.00-0.93%). The results showed that aEEG with automatic seizure detection developed by our process was an effective screening tool to monitor seizures.

关键词： Amplitude-integrated EEG Seizure Detection CHB-MIT Scalp EEG Database Seizures Cerebral function analysing monitor Data logging Epilepsy Time compression AUTOMATIC tool monitor Performance metrics ANNOTATIONS

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Search for anisotropic gravitational-wave backgrounds using data from Advanced LIGO and Advanced Virgo’s first three observing runs

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Physical Review D 2021年第2期104卷 022005-022005页

作者： R. Abbott T. D. Abbott S. Abraham F. Acernese K. Ackley A. Adams C. Adams R. X. Adhikari V. B. Adya C. Affeldt D. Agarwal M. Agathos K. Agatsuma N. Aggarwal O. D. Aguiar L. Aiello A. Ain P. Ajith T. Akutsu K. M. Aleman G. Allen A. Allocca P. A. Altin A. Amato S. Anand A. Ananyeva S. B. Anderson W. G. Anderson M. Ando S. V. Angelova S. Ansoldi J. M. Antelis S. Antier S. Appert Koya Arai Koji Arai Y. Arai S. Araki A. Araya M. C. Araya J. S. Areeda M. Arène N. Aritomi N. Arnaud S. M. Aronson H. Asada Y. Asali G. Ashton Y. Aso S. M. Aston P. Astone F. Aubin P. Aufmuth K. AultONeal C. Austin S. Babak F. Badaracco M. K. M. Bader S. Bae Y. Bae A. M. Baer S. Bagnasco Y. Bai L. Baiotti J. Baird R. Bajpai M. Ball G. Ballardin S. W. Ballmer M. Bals A. Balsamo G. Baltus S. Banagiri D. Bankar R. S. Bankar J. C. Barayoga C. Barbieri B. C. Barish D. Barker P. Barneo F. Barone B. Barr L. Barsotti M. Barsuglia D. Barta J. Bartlett M. A. Barton I. Bartos R. Bassiri A. Basti M. Bawaj J. C. Bayley A. C. Baylor M. Bazzan B. Bécsy V. M. Bedakihale M. Bejger I. Belahcene V. Benedetto D. Beniwal M. G. Benjamin T. F. Bennett J. D. Bentley M. BenYaala F. Bergamin B. K. Berger S. Bernuzzi D. Bersanetti A. Bertolini J. Betzwieser R. Bhandare A. V. Bhandari D. Bhattacharjee S. Bhaumik J. Bidler I. A. Bilenko G. Billingsley R. Birney O. Birnholtz S. Biscans M. Bischi S. Biscoveanu A. Bisht B. Biswas M. Bitossi M.-A. Bizouard J. K. Blackburn J. Blackman C. D. Blair D. G. Blair R. M. Blair F. Bobba N. Bode M. Boer G. Bogaert M. Boldrini F. Bondu E. Bonilla R. Bonnand P. Booker B. A. Boom R. Bork V. Boschi N. Bose S. Bose V. Bossilkov V. Boudart Y. Bouffanais A. Bozzi C. Bradaschia P. R. Brady A. Bramley A. Branch M. Branchesi J. E. Brau M. Breschi T. Briant J. H. Briggs A. Brillet M. Brinkmann P. Brockill A. F. Brooks J. Brooks D. D. Brown S. Brunett G. Bruno R. Bruntz J. Bryant A. Buikema T. Bulik H. J. Bulten A. Buonanno R. Buscicchio D. Buskulic R. L. Byer L. Cadonati M. Caesar G. Cagnoli C. Cahillane H. W. Cain, III J. Calderón Bustillo J. LIGO Laboratory California Institute of Technology Pasadena California 91125 USA Louisiana State University Baton Rouge Louisiana 70803 USA Inter-University Centre for Astronomy and Astrophysics Pune 411007 India Dipartimento di Farmacia Università di Salerno I-84084 Fisciano Salerno Italy INFN Sezione di Napoli Complesso Universitario di Monte S.Angelo I-80126 Napoli Italy OzGrav School of Physics & Astronomy Monash University Clayton 3800 Victoria Australia Christopher Newport University Newport News Virginia 23606 USA LIGO Livingston Observatory Livingston Louisiana 70754 USA OzGrav Australian National University Canberra Australian Capital Territory 0200 Australia Max Planck Institute for Gravitational Physics (Albert Einstein Institute) D-30167 Hannover Germany Leibniz Universität Hannover D-30167 Hannover Germany University of Cambridge Cambridge CB2 1TN United Kingdom Theoretisch-Physikalisches Institut Friedrich-Schiller-Universität Jena D-07743 Jena Germany University of Birmingham Birmingham B15 2TT United Kingdom Center for Interdisciplinary Exploration & Research in Astrophysics (CIERA) Northwestern University Evanston Illinois 60208 USA Instituto Nacional de Pesquisas Espaciais 12227-010 São José dos Campos São Paulo Brazil Gravity Exploration Institute Cardiff University Cardiff CF24 3AA United Kingdom Gran Sasso Science Institute (GSSI) I-67100 L’Aquila Italy INFN Laboratori Nazionali del Gran Sasso I-67100 Assergi Italy INFN Sezione di Pisa I-56127 Pisa Italy Università di Pisa I-56127 Pisa 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 California State University Fullerton Fullerton California 92831 USA NCSA University of Illinois

We report results from searches for anisotropic stochastic gravitational-wave backgrounds using data from the first three observing runs of the Advanced LIGO and Advanced Virgo detectors. For the first time, we include Virgo data in our analysis and run our search with a new efficient pipeline called pystoch on data folded over one sidereal day. We use gravitational-wave radiometry (broadband and narrow band) to produce sky maps of stochastic gravitational-wave backgrounds and to search for gravitational waves from point sources. A spherical harmonic decomposition method is employed to look for gravitational-wave emission from spatially-extended sources. Neither technique found evidence of gravitational-wave signals. Hence we derive 95% confidence-level upper limit sky maps on the gravitational-wave energy flux from broadband point sources, ranging from Fα,Θ<(0.013–7.6)×10−8 erg cm−2 s−1 Hz−1, and on the (normalized) gravitational-wave energy density spectrum from extended sources, ranging from Ωα,Θ<(0.57–9.3)×10−9 sr−1, depending on direction (Θ) and spectral index (α). These limits improve upon previous limits by factors of 2.9–3.5. We also set 95% confidence level upper limits on the frequency-dependent strain amplitudes of quasimonochromatic gravitational waves coming from three interesting targets, Scorpius X-1, SN 1987A and the Galactic Center, with best upper limits range from h0<(1.7–2.1)×10−25, a factor of ≥2.0 improvement compared to previous stochastic radiometer searches.

关键词： Experimental studies of gravity General relativity Gravitational waves

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