Medidas de concentração de radônio proveniente de argamassas de cimento portland, gesso e fosfogesso

Portland cement being very common construction material has in its composition the natural gypsum. To decrease the costs of manufacturing, the cement industry is substituting the gypsum in its composition by small quantities of phosphogypsum, which is the residue generated by the production of fertilizers and consists essentially of calcium dihydrate and some impurities, such as fluoride, metals in general, and radionuclides. Currently, tons of phosphogypsum are stored in the open air near the fertilizer industries, causing contamination of the environment. The 226 Ra present in these materials, when undergoes radioactive decay, produces the 222Rn gas. This radioactive gas, when inhaled together with its decay products deposited in the lungs, produces the exposure to radiation and can be a potential cause of lung cancer. Thus, the objective of this study was to measure the concentration levels of 222Rn from cylindrical samples of Portland cement, gypsum and phosphogypsum mortar from the state of Paraná, as well as characterizer the material and estimate the radon concentration in an environment of hypothetical dwelling with walls covered by such materials. Experimental setup of 222Rn activity measurements was based on AlphaGUARD detector (Saphymo GmbH). The qualitative and quantitative analysis was performed by gamma spectrometry and EDXRF with Au and Ag targets tubes (AMPTEK), and Mo target (ARTAX) and mechanical testing with x- ray equipment (Gilardoni) and the mechanical press (EMIC). Obtained average values of radon activity from studied materials in the air of containers were of 854 ± 23 Bq/m3, 60,0 ± 7,2 Bq/m3 e 52,9 ± 5,4 Bq/m3 for Portland cement, gypsum and phosphogypsum mortar, respectively. These results extrapolated into the volume of hypothetical dwelling of 36 m3 with the walls covered by such materials were of 3366 ± 91 Bq/m3, 237 ± 28 Bq/m3 e 208 ± 21 Bq/m3for Portland cement, gypsum and phosphogypsum mortar, respectively. Considering the limit of 300 Bq/m3 established by the ICRP, it could be concluded that the use of Portland cement plaster in dwellings is not secure and requires some specific mitigation procedure. Using the results of gamma spectrometry there were calculated the values of radium equivalent activity concentrations (Raeq) for Portland cement, gypsum and phosphogypsum mortar, which were obtained equal to 78,2 ± 0,9 Bq/kg; 58,2 ± 0,9 Bq/kg e 68,2 ± 0,9 Bq/kg, respectively. All values of radium equivalent activity concentrations for studied samples are below the maximum level of 370 Bq/kg. The qualitative and quantitative analysis of EDXRF spectra obtained with studied mortar samples allowed to evaluate quantitate and the elements that constitute the material such as Ca, S, Fe, and others.

RACHMANINOFF AND MEDTNER: SELECTED WORKS FROM THE SOLO AND COLLABORATIVE PIANO REPERTOIRE

Sergei Rachmaninoff and Nikolai Medtner occupy a special place in the history of Russian music. Both composers were exceptional pianists and left us some of the greatest works in the piano repertoire. Although these composers shared many similarities, and were often compared, their musical languages and views on composition were very different. Unfortunately, Medtner’s music, which Rachmaninoff admired greatly, has remained neglected for several generations of performers and listeners. In my dissertation I will explore the similarities and contrasts in Rachmaninoff’s and Medtner’s music. Through these performances, I hope to encourage other musicians to discover the imaginative power of Medtner’s music. Of course, no such encouragement is needed for Rachmaninoff’s extremely popular music; however, the technical and musical challenges of performing that repertoire are an invaluable part of every pianist’s education. This dissertation project was presented in three recitals which were performed in Gildenhorn Recital Hall at the Clarice Smith Performing Arts Center of the University of Maryland on May 8, 2014, December 5, 2014 and March 21, 2016. The following pieces comprised the survey of Rachmaninoff music: Vocalise Op. 34, Variations on a Theme of Corelli Op. 42, Piano Concerto No 2 Op. 18, Selected Songs Opp. 4 and 8, and two Moments Musicaux Op. 16 - Nos 3 and 4. The following pieces were included to represent Medtner: Sonata for Violin and Piano Op. 57 in E minor “Epica”, Fairy Tales for solo piano Op. 20 No 1, Op. 26 No 3 and Op. 51 No 1, and Selected Songs Op. 6 and 15. My partners in this project were Lilly Ahn, soprano, Jennifer Lee, violin and Nadezhda Christova, piano. All three recitals can be found in the Digital Repository at the University of Maryland (DRUM).

Sacrum w drodze. Moskwa-Pietuszki Wieniedikta Jerofiejewa i Pulp Fiction Quentina Taranino w kluczu montażowego czytania

The aim of this monograph is the attempt of reading the poem Moscow-Petushki by Venedikt Erofeev and the film Pulp Fiction by Quentin Tarantino using the comparative approach, in which we go beyond the range of factual relationships, historical influences or similarities functioning in the structure of the presented world. The purpose of the book is to see both works of art from the angle of the montage theory of Sergei Eisenstein – the outstanding and highly regarded Russian director and film philosopher – which means studying cultural phenomena in their mutual intertextual relationships. The book focuses on the interpretation of the selected Tarantino’s and Erofeev’s texts of culture, in which the subject of the city, the search for the concept of the body at the end of 20th century and the problem of addictions constitute the dominant thematic issues. The monograph also offers the insight into the nature of the phenomenon of postmodernism and treats Eisenstein’s philosophy as the specific type of anticipation of postmodern tendencies in cinematography.

On the existence of right adjoints for surjective mappings between fuzzy structures0

En este trabajo los autores continúan su estudio de la caracterización de la existencia de adjunciones (conexiones de Galois isótonas) cuyo codominio no está dotado de estructura en principio. En este artículo se considera el caso difuso en el que se tiene un orden difuso R definido en un conjunto A y una aplicación sobreyectiva f:A-> B compatible respecto de dos relaciones de similaridad definidas en el dominio A y en el condominio B, respectivamente. Concretamente, el problema es encontrar un orden difuso S en B y una aplicación g:B-> A compatible también con las correspondientes similaridades definidas en A y en B, de tal forma que el par (f,g) constituya un adjunción.

Temporal solitonic crystals and non-Hermitian informational lattices

Clusters of temporal optical solitons—stable self-localized light pulses preserving their form during propagation—exhibit properties characteristic of that encountered in crystals. Here, we introduce the concept of temporal solitonic information crystals formed by the lattices of optical pulses with variable phases. The proposed general idea offers new approaches to optical coherent transmission technology and can be generalized to dispersion-managed and dissipative solitons as well as scaled to a variety of physical platforms from fiber optics to silicon chips. We discuss the key properties of such dynamic temporal crystals that mathematically correspond to non-Hermitian lattices and examine the types of collective mode instabilities determining the lifetime of the soliton train. This transfer of techniques and concepts from solid state physics to information theory promises a new outlook on information storage and transmission.

Weakly-constrained codes for suppression of patterning effects in digital communications

We propose weakly-constrained stream and block codes with tunable pattern-dependent statistics and demonstrate that the block code capacity at large block sizes is close to the the prediction obtained from a simple Markov model published earlier. We demonstrate the feasibility of the code by presenting original encoding and decoding algorithms with a complexity log-linear in the block size and with modest table memory requirements. We also show that when such codes are used for mitigation of patterning effects in optical fibre communications, a gain of about 0.5dB is possible under realistic conditions, at the expense of small redundancy (≈10%). © 2010 IEEE

Del teatro al cine: hacia una teoría de la adaptación. (Tres versiones de Macbeth)

¿De qué se componen los sistemas semióticos propios de cada lenguaje, el dramático y el cinematográfico? ¿Cuáles son los complejos procesos de transformación por los que un texto dramático se convierte en una función teatral o bien en una obra fílmica? ¿Qué diferencia esencialmente la recepción de ambas obras? Y, finalmente, ¿existe la posibilidad de una teoría que estudie sistemáticamente el fenómeno de la adaptación? Estas son las preguntas que voy a tratar de responder en este trabajo, que llevarán a elaborar un esbozo de teoría de la adaptación del modo dramático al cinematográfico. Como cimientos previos a la elaboración de esta investigación, planteo un acercamiento a las teorías dramáticas y cinematográficas. Las fuentes que utilizo son, en primer lugar, los estudios sobre ambos sistemas semióticos. Para el estudio del drama utilizo el método de análisis dramatológico perfectamente sistematizado de José Luis García Barrientos en Cómo se comenta una obra de teatro (2001) y en Análisis de la dramaturgia. Nueve obras y un método (2007), complementándolo con las teorías de José Luis Alonso de Santos, Antonin Artaud, Ian Bernard, Keir Elam, John Gielgud, Roger Manvell, Vsévolod Emílievich Meyerhold, Konstantin Stanislavki y Anne Ubersfeld entre otros. Para el estudio de la teoría cinematográfica me apoyo en los estudios, principalmente, de Rudolph Arnheim, Henri Agel, Andrew Dudley, Daniel Arijon, Jacques Aumont y Michel Marie, Béla Balázs, André Bazin, David Bordwell y Kristin Thompson, Fernando Canet y Josep Prósper, Francesco Casetti, Sergei Eisenstein, Joaquín de Entrambasaguas, Jean Epstein, Susan Hayward, Siegfried Kracauer, Yuri Lotman, Marcel Martin, Christian Metz, Jean Mitry, Vsevolod Pudovkin, Vicente Sánchez Biosca y Robert Stam entre otros, quienes, en conjunto ofrecen un compendio muy amplio y dan una idea bastante completa y sistematizada del arte y lenguaje cinematográfico...