An exploratory study of parameter sensitivity, representation of results and extensions of PSHA: case study - United Arab Emirates

Despite the wide use of probabilistic seismic hazard analysis (PSHA) for the evaluation of seismic hazard, some degree of confusion and misunderstanding exists regarding how the hazard calculations should be performed as well as how the hazard results should be interpreted. In this thesis, different aspects of PSHA that are commonly misunderstood, as well as some new developments, are investigated. To this end, a comprehensive case study PSHA for three cities in the United Arab Emirates is carried out. Previous publications present contradictory interpretations of the earthquake threat in this country, creating confusion regarding appropriate seismic design levels. The results of this PSHA confirm low hazard levels in most of the country (UBC97, Zone 0) that increase as one moves northwards (UBC97, Zone 1). Using the case study as a point of reference, the mechanics and implications of performing hazard disaggregation when using multiple ground-motion prediction equations (GMPEs) within a logic-tree framework are investigated. Logic-tree approaches receive significant attention as different ways of representing hazard results from logic trees are discussed as well as issues associated with the identification of hazard-dominating scenarios and how these may influence the definition of scenario spectra for the selection of ground-motion records for seismic design. The sensitivity of the hazard results to key parameters in PSHA such as: the minimum magnitude deemed to be of engineering significance; the activity parameters of seismic sources; the use of alternative GMPEs and the standard deviations associated with these models; and the allocation of weights to logic-tree branches is investigated. Furthermore, recently proposed alternatives to the specification of a minimum magnitude as the criteria for identifying non-damaging earthquakes are studied. Finally, correlations between the hazard results obtained in terms of spectral accelerations and hazard results in terms of peak ground velocity and spectral intensity are explored

Taking measures using digital photographs: An experimental review of existing procedures, possible error sources, replicability of the method and potential uses

El uso de medios digitales para el análisis arqueológico está a la orden del día. Un ejemplo es el uso de fotografías digitales para la obtención de medidas en diferentes objetos. Se presenta aquí un repaso al procedimiento de medida de filos en lascas publicado por Eren et al., (2008), una experiencia de reproductividad del método, y una ampliación experimental de sus potenciales usos para el análisis de industria lítica. Los resultados muestran que se trata de un procedimiento relativamente rápido, accesible con una mínima inversión en software y hardware, y con una alta fiabilidad en la obtención de datosThe use of digital resources for archaeological analysis is at the order of the day. Digital photographs constitute a good example of haw precise measures can be obtained. A review of Eren’s et al., (2008) procedure for measuring edge length is provided along with an experience of data replicability, and an experimental extension of possible applications for the analysis of lithic industry. Results show that the procedure provides reliable and precise data with a low investment of hardware, software and tim

Facile synthesis of isoxazoles and pyrazoles from ß-diketohydrazones

Indexación: ScieloNew 3,5-dimethyl-4-[(E)-4-(R1-phenyl)diazenyl]isoxazoles and 3,5-dimethyl-1-(R2-phenyl)-4-[(E)-(R1-phenyl)diazenyl]-1H-pyrazoles may be obtained by reaction of 3-[2-(R1-phenyl)hydrazono)]pentane-2,4-dione with H2NOH-HCl and R2-4-C6H4-NHNH2, respectively. The reactions were performed in ethanol as solvent and catalyzed by glacial acetic acid.http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-97072009000300013&nrm=is

The quantification of surface abrasion on flint stone tools

Lithic artifacts are some of the most common and numerous remains recovered from paleolithic archaeological sites. However, these materials can undergo multiple post-depositional alterations after their introduction into the archaeological record. Due to the high quantity of lithic remains recovered, a quick, flexible, and effective method for identifying degrees of alteration on the surface of lithic implements is highly desirable. The present study examines the use of gray level images to obtain quantitative data from the surface of flint artifacts and determine whether these images can detect the presence of post-depositional alterations. An experimental collection of flints was subjected to sequential episodes of rounding in a tumbling machine. After each episode, photographs were taken with a microscope, resulting in quantitative surface values using gray level values. The quantitative surface values were used as variables in machine learning models to determine time of exposure and the most salient variables for discrimination. Our results indicate that the extraction of metrics from gray level images successfully capture changes in the surface of flint artifacts caused by post-depositional processes. Additional results provide insight into which areas to sample when seeking post-depositional alterations and underscore the importance of particle size in the generation of alterationsProgram for the Requalification of the University System Margarita Salas, Grant/ Award Number: CA1/RSUE/2021-00743; Ministry of Universities (Ministerio de Universidades); Autonomous University of Madrid (Universidad Autonoma de Madrid); Generalitat de Catalunya, AGAUR agency, Grant/Award Number: 2021SGR01239; Universitat Rovira i Virgili, Grant/Award Number: 2022PFR-URV-64; Spanish Ministry of Science and Innovation, Grant/Award Numbers: CEX2019-000945-M, PID2021-122355NB-C32; Agencia Estatal de Investigacion, Grant/Award Number: HAR2016-76760-C3-2-P; Spanish National Plan for Scientific and Technical Research and Innovation, Grant/Award Number: ID2019-103987 GB-C3

Codo de tenis (tendinosis epicondílea externa): tratamiento esclerosante ecoguiado con polidocanol. A propósito de dos casos

Dos pacientes (2 varones de 42 y 55 años) con tendinosis epicondílea externa dolorosa fueron tratados mediante un novedoso tratamiento que se basa en la esclerosis con Polidocanol, un agente esclerosante, ecoguiada con Power Color (PC) mediante Doppler color de polidocanol, un agente esclerosante. Tras el tratamiento se produjo una marcada reducción del dolor recogida mediante una escala analógica visual (VAS) y desaparición y disminución de la vascularización en cada caso, respectivamente. El caso 1 era deportista y en la última revisión se encontraba en fase de readaptación deportiva, mientras que el caso 2 retomó su actividad laboral abandonada previamente. La esclerosis ecoguiada de los neovasos parece ser un tratamiento efectivo para la tendinopatía epicondílea externa dolorosa crónica, sugiriendo que los neovasos desempeñan un papel importante en el origen del dolor crónico del tendón

Sistema de información de precios agrícolas basado en telefonía móvil

To enhancement of agricultural complex competitiveness through it based information systems in transition economies such as Chile is a real challenge to professionals involved in this field. Through a Corfo-Innova initiative, the project based on wireless technology WI-FI and WI-MAX as well as mobile technology SMS and WAP was formed to create an information system. Using these applications it is possible to have access to current, updated, and strategic information from the formal agricultural markets in Chile to support agricultural producers

Multiple approaches to predicting flake mass

Predicting original flake mass is a major goal of lithic analysis. Predicting original flake mass allows for researchers to make estimations of remaining mass, lost mass, and other features. All these measures relate to the organization of lithic technology by past societies. The present work tests three different models to predict log of flake mass: multiple linear regression, random forest regression, and artificial neural networks (ANN). Estimations of flake mass were performed using the remaining features of flakes from an experimental assemblage. This assemblage was obtained by the expansion of a previous dataset through the inclusion of bigger flakes, allowing the analysis to account for the effects of sample size and value distribution. Correlation results show a large/ strong relation between predictions and real outcome (r 2 = 0.78 in the best case). Comparison of the models affords insights into variable importance for predicting flake mass. Results show that (for the present dataset) multiple linear regression still stands as the best method for predicting log of flake weight. Additionally, transformation of predicted values from the multiple linear regression and true values to the linear scale reinforces the linear correlation above the 0.8 threshold. This article is the result of the research projects “Como, Quien Y Donde?: Variabilidad De Comportamientos En La Captacion ´ Y Transformacion ´ De Los Recursos Liticos Dentro De Grupos Neandertales 2” (HAR2016-76760-C3-2-P) financed by Agencia Estatal de Investigacion ´ (AEI), Fondo Europeo de Desarrollo Regional (FEDER); and “En Los Limites De La Diversidad: Comportamiento Neandertal En El Centro Y Sur De La Penisula Iberica” (ID2019- 103987 GB-C33) financed by the Programa Estatal de Generacion ´ de Conocimiento y Fortalecimiento Científico y Tecnologico ´ del Sistema de I + D + i y de I + D + i Orientada a los Retos de la Sociedad, del Plan Estatal de Investigacion ´ Científica y T´ecnica y de Innovacion ´ (2017–2020). Development of the experimentation and analysis of the materials were undertaken at the Laboratory of Experimental Archaeology (Universidad Autonoma ´ de Madrid). This work has been carried out with the financial support of the Generalitat de Catalunya, AGAUR agency (2017SGR1040 Research Group), the Universitat Rovira i Virgili (2021PFR-URV-126), and the Spanish Ministry of Science and Innovation (MICINN/FEDER project PID2021-122355NB-C32).The Institut Catala ` de Paleoecologia Humana i Evolucio ´ Social (IPHES-CERCA) has received financial support from the Spanish Ministry of Science and Innovation through the “María de Maeztu” program for Units of Excellence (CEX2019-000945-M

Spectral analysis of signals by time-domain statistical characterization and neural network processing: Application to correction of spectral amplitude alterations in pulse-like waveforms

We present a time-domain method to detect and correct spectral alterations of signals by employing statistical characterization of waveforms and a pattern-recognition procedure using simple Artificial Neural Networks. The proposed strategy implements very-fast routines with a computational cost proportional to the number of signal samples, being convenient for applications in embedded environments with limited computational capabilities or fast real-time control tasks. We use the proposed algorithms to correct spectral amplitude attenuations in a pulse-like waveform with a sinc profile as an application example

A second monoclinic polymorph of 2-[2-(4-meth­oxy­phen­yl)hydrazinyl­idene]-1,3-diphenyl­propane-1,3-dione

The title compound, C22H18N2O3 is the second monoclinic polymorph (P21/c) of the compound, the first being reported in space group P21 [Bertolasi et al. (1993 ▶). J. Chem. Soc. Perkin Trans. 2, pp. 2223–2228]. In the mol­ecular structure of the title compound, the inter­planar angle between the benzoyl units is 80.04 (5)°, while the corresponding angles between the phenyl­hydrazinyl­idene and benzoyl groups are 36.11 (5) and 55.77 (2)°. A strong resonance-assisted intra­molecular N—H⋯O hydrogen bond is found. In the crystal, the entire supra­molecular structure is constructed by weak inter­molecular C—H⋯O inter­actions and an inter-ring π–π inter­action [centroid–centroid distance = 3.6088 (8) Å]

Las fuentes ibérica para la historia de Tetuán (siglos XVI y XVII)

The history of Tetuan has deep traces in our own history. The town was born at the end of the XV century, as a refuge of the hispano-muslim exiled from the Granada kingdom. From the very start was hostile against Spain, and forme a market of Christian slaves, famous in all Europe. Portugal and Spain as well, ocupied fortress in the coast of North Morocco. So is very interesting the study of the Iberian sources for the Tetuan history. Over all in both centuries XVI and XVII. This work collect several years of efforts in the Morocco history and especially in the North of the country. We give to research, useful items in the future.La historia de Tetuán despierta ecos profundos en nuestra propia historia. La ciudad, nacida al calor del exilio hispano musulmán consecuente del final del Islam español, mantuvo un foco de hostilidad activa contra España durante los siglos XVI y XVII. La lucha, perdida en Granada se prolongó en el N. africano, tomando aquí la forma de ofensiva marítima contra las costas y mares peninsulares. Las potencias ibéricas ocuparon plazas fuertes en el litoral norte-africano. Este resumen nos revela la importancia que tiene el estudio de las fuentes ibéricas, españolas y portuguesas, para la historia de Tetuán en esos siglos cruciales. El presente trabajo resume muchos años de esfuerzo dedicados a la historia del trapecio Norte marroquí en particular, y de Marruecos, en general