Damage Detection Using Ultrasonic Techniques in Concrete-Filled Steel Tubes (CFSTs) Columns

Concrete-filled steel tubes (CFSTs) are structural elements that, as a consequence of an incorrect elaboration, can exhibit internal defects that cannot be visualized, being usually air voids. In this work, the detection of internal damage in CFST samples elaborated with a percentage of contained air voids in concrete, was carried out by performing a complete ultrasound scan using an immersion tank. The analysis of the ultrasound signals shows the differences presented in the amplitude of the fundamental frequency of the signal, and in the Broadband Ultrasound Attenuation (BUA), in comparison with a sample without defects. The main contribution of this study is the application of the BUA technique in CFST samples for the location of air voids. The results present a linear relationship between BUA averages over the window of the CFSTs and the percentage of air voids contained (Pearson’s correlation coefficient r = 0.9873), the higher percentage of air voids, the higher values of BUA. The BUA algorithm could be applied effectively to distinguish areas with defects inside the CFSTs. Similar to the BUA results, the analysis in the frequency domain using the FFT and the STFT was sensitive in the detection of internal damage (Pearson’s correlation coefficient r = −0.9799, and r = −0.9672, respectively). The results establish an improvement in the evaluation of CFST elements for the detection of internal defects

The role of maternal age, growth, and environment in shaping offspring performance in an aerial conifer seed bank

11 Pág.Maternal effects have been demonstrated to affect offspring performance in many organisms, and in plants, seeds are important mediators of these effects. Some woody plant species maintain long-lasting canopy seed banks as an adaptation to wildfires. Importantly, these seeds stored in serotinous cones are produced by the mother plant under varying ontogenetic and physiological conditions.This research was supported by the Spanish Government via the Ministry of Science, Innovation and Universities (MICIU) grants AGL2015-68274-C03-1-R and RTI2018-094691-B-C32 and by a predoctoral research fellowship from the Spanish MICIU (BES-2016-077347).Peer reviewe

Nonlinear ultrasonics for early damage detection

Structural Health Monitoring (SHM) is an emerging discipline that aims at improving the management of the life cycle of industrial components. The scope of this chapter is to present the integration of nonlinear ultrasonics with the Bayesian inverse problem as an appropriate tool to estimate the updated health state of a component taking into account the associated uncertainties. This updated information can be further used by prognostics algorithms to estimate the future damage stages. Nonlinear ultrasonics allows an early detection of damage moving forward the achievement of reliable predictions, while the inverse problem emerges as a rigorous method to extract the slight signature of early damage inside the experimental signals using theoretical models. The Bayesian version of the inverse problem allows measuring the underlying uncertainties, improving the prediction process. This chapter presents the fundamentals of nonlinear ultrasonics, their practical application for SHM, and the Bayesian inverse problem as a method to unveil damage and manage uncertainty.</jats:p

Diagnóstico y erradicación de la violencia - grupo violencia

IP 0101-10-001-87cotidiano, lo social y lo politico / Olga Amparo Sanchez,MarthaLucia Uribe -- La familia y la socializacion;de la violencia / Maria Himelda Ramirez -- Violencia y mediosdecomunicacion / Ramon Jimeno, Ana Maria Cano; Violencia y medios de comunicacion / Arturo Guerrero --Violencia y medios de comunicacion Guillermo Callej;M.;carcelaria en Colombia / Annette Pearson, Jesus Antonio Muñoz--Violenciaintrafamiliar : una mirada desde lo;Cauca : la violencia en el cauca vision sintetica -- Economiade la violencia / Salomon Kalmanovitz -- La;violencia y el problema agrario / Alejandro Reyes Posada -'- Reforma politica y proceso de paz / Alvaro;Echeverry Uruburu -- La violencia y los pueblos indigenasde hoy/ VictorManuel Bonilla S. -- Administracion;de justicia y nuevo codigo penal / Humberto Rendon Arango'-- Politica internacional y pacificacion nacional /;Juan Tokatlian, Rodrigo Pardo -- La crisis de la justiciay lasacciones requeridas para su transformacion /;Jorge Acevedo B. -- El aumento de la violencia delincuencial estambien una expresion de la crisis del derecho;penal / Pastor Alberto Acevedo -- Investigacion criminologica:homicidiosen Cali 1980 - 1985 / Jaime Patiño;'-- organizaciones populares- civiles e institucionalizacion /Carlos Vicente de Roux -- La violencia;[et al.] -- Manifestaciones de violencia en la zona esmeraldifera y el occidente de Boyaca / Javier Guerrero;Baron -- Bases para un posible estatuto del indigena / AdolfoTriana Antorveza -- Violencia y Colonizacion /;Alfredo Molano -- El programa de inversiones del PNR y elPPAyla inversion publica en la actual coyuntura /;Alberto Corchuelo -- Inspecciones de policia / Luisa MargaritaH. de Yepes'-- Consejo Regional indigena del;LIBROS: Colombia : violencia y democracia informe presentado aMinisteriode Gobierno / Jaime Arocha R. ..

BIOLOGICS USE in SLE in 23 CENTERS - DATA FROM the INTERNATIONAL REGISTRY for BIOLOGICS in SLE

Karolinska Univ Hosp, Stockholm, SwedenRigshosp, DK-2100 Copenhagen, DenmarkCedars Sinai UCLA, Los Angeles, CA USADalhousie Univ & Capital Hlth, Halifax, NS, CanadaJohns Hopkins Univ Hosp, Baltimore, MD 21287 USAUCL, London, EnglandMcGill UHC RI, Montreal, PQ, CanadaMcGill Univ, Ctr Hlth, Montreal, PQ, CanadaMcGill UHC RVH, Montreal, PQ, CanadaKarolinska Inst, Stockholm, SwedenHanyang Univ, Hosp Rheumat Dis, Seoul 133791, South KoreaHosp Clin Barcelona, Barcelona, SpainHosp Cruces, Bizkaia, SpainHosp Virgen Rocio, Seville, SpainHosp Miguel Servet, Zaragoza, SpainHosp San Cecilio, Granada, SpainHosp Son Dureta, Palma de Mallorca, SpainHosp Carlos Haya, Malaga, SpainIstanbul Univ, Istanbul Fac Med, Istanbul, TurkeyNorthwestern Univ, Feinberg Sch Med, Chicago, IL 60611 USAUniv Manitoba, Winnipeg, MB, CanadaCareggi Hosp Florence, Florence, ItalyUniv Szeged, Szeged, HungaryUniv Padua, Padua, ItalyUniv Debrecen, H-4012 Debrecen, HungaryHlth Sci Ctr, Debrecen, HungaryUniv Cattolica Sacro Cuore, Div Rheumatol, I-00168 Rome, ItalyCatholic Univ, Rheumatol Unit, Rome, ItalyUniversidade Federal de São Paulo, Escola Paulista Med, São Paulo, BrazilUniversidade Federal de São Paulo, Escola Paulista Med, São Paulo, BrazilWeb of Scienc