Bond Enhancement Techniques for PCC Whitetopping, HR-341, 1996

This research was initiated in 1991 as a part of a whitetopping project to study the effectiveness of various techniques to enhance bond strength between a new portland cement concrete (PCC) overlay and an existing asphalt cement concrete (ACC) pavement surface. A 1,676 m (5,500 ft) section of county road R16 in Dallas County was divided into 12 test sections. The various techniques used to enhance bond were power brooming, power brooming with air blast, milling, cement and water grout, and emulsion tack coat. Also, two sections were planed to a uniform cross-section, two pavement thicknesses were placed, and two different concrete mix proportions were used. Bond strength was perceived to be the key to determining an appropriate design procedure for whitetopping. If adequate bond is achieved, a bonded PCC overlay technique can be used for design. Otherwise, an unbonded overlay procedure may be more appropriate. Conclusions are as follows: (1) Bond Strength Differences - Milling increased bond strength versus no milling. Tack coat showed increased bond strength versus no tack coat. Planing, Air Blast and Grouting did not provide noticeable improvements in bond strength; nor did different PCC types or thicknesses affect bond strength significantly. (2) Structure - Structural measurements correlated strongly with the wide variation in pavement thicknesses. They did not provide enough information to determine the strength of bonding or the level of support being provided by the ACC layer. Longitudinal cracking correlated with PCC thicknesses and with planing. (3) Bond Over Time - The bond between PCC and ACC layers is degrading over time in the outside wheel path in all of the sections except tack coat (section 12). The bond strength in the section with tack coat was lower than the others, but remained relatively steady.

Els nous ensenyaments a la Facultat de Pedagogia: un tema obert

La universitat és motor i producte, és innovadora i con seqüencia, és iniciadora i resultat, és creadora de canvis a partir de les seves aportacions científiques i esta interrelacionada amb el medi social on es troba. La universitat és un ens que a través deis seus estudis i recerques i de la docencia fa aportacions a la ciencia, a la tecnica, a la societat pero també és receptora de tot un seguit d'elements que el medi genera i que ella ha d'assolir.

Cap a una ciutadania intercultural. Un tema emergent a la recerca educativa

En aquest article oferim una aproximació a l'estudi de la ciutadania intercultural des de l'investigació educativa. Per això, hem resumit en primer lloc, els nous plantejaments de la ciutadania que fonamentnen la investigació realitzada pel GREDI en aquests darrers anys. El nostre model recull, com trets claus de la ciutadania que pretenim es desenvolupi des de l'educació, el fet de ser, alhora, activa i responsable, crítica i intercultural; desenvolupada en l'àmbit local però oberta a nivells més amplis. Posteriorment, l'article sintetitza algunes de les investigacions dutes a terme en aquest camp. La segona part d'aquest article ofereix un resum d'una de les investigacions realitzades pel GREDI i que ha permès diagnosticar els elements que configuren el contepcte i la pràctica de la ciutadania en els joves de 14 a 16 anys a Barcelona. Es conclou assenyalant els elements significatius que poden trobar-se en les invesetigacions presentades i que permeten dibuixar les línees de progrés per a qui desitja endinsar-se en la investigació en aquesta àrea temàtica.

Sherlock Holmes, Agente 007

Londres, 1891, Sherlock Holmes y el Dr. Watson evitan el asesinato de una niña por parte de lord Blackwood (Marc Strong), un asesino místico al que perseguía desde hacía mucho tiempo. Tres meses más tarde, Holmes está sin un nuevo caso y se aburre. Watson pretende irse del 221 de Baker Street para independizarse y casarse con María Morstan. La película no es la adaptación de ninguna novela de Conan Doyle. Está basada es una historia escrita por Lionel Wigram, luego adaptada a un cómic con dibujos de John Watkiss.

Correlation between microtensile bond strength data and clinical outcome of Class V restorations.

OBJECTIVE: To determine if the results of resin-dentin microtensile bond strength (µTBS) is correlated with the outcome parameters of clinical studies on non-retentive Class V restorations. METHODS: Resin-dentin µTBS data were obtained from one test center; the in vitro tests were all performed by the same operator. The µTBS testing was performed 8h after bonding and after 6 months of storing the specimens in water. Pre-test failures (PTFs) of specimens were included in the analysis, attributing them a value of 1MPa. Prospective clinical studies on cervical restorations (Class V) with an observation period of at least 18 months were searched in the literature. The clinical outcome variables were retention loss, marginal discoloration and marginal integrity. Furthermore, an index was formulated to be better able to compare the laboratory and clinical results. Estimates of adhesive effects in a linear mixed model were used to summarize the clinical performance of each adhesive between 12 and 36 months. Spearman correlations between these clinical performances and the µTBS values were calculated subsequently. RESULTS: Thirty-six clinical studies with 15 adhesive/restorative systems for which µTBS data were also available were included in the statistical analysis. In general 3-step and 2-step etch-and-rinse systems showed higher bond strength values than the 2-step/3-step self-etching systems, which, however, produced higher values than the 1-step self-etching and the resin modified glass ionomer systems. Prolonged water storage of specimens resulted in a significant decrease of the mean bond strength values in 5 adhesive systems (Wilcoxon, p<0.05). There was a significant correlation between µTBS values both after 8h and 6 months of storage and marginal discoloration (r=0.54 and r=0.67, respectively). However, the same correlation was not found between µTBS values and the retention rate, clinical index or marginal integrity. SIGNIFICANCE: As µTBS data of adhesive systems, especially after water storage for 6 months, showed a good correlation with marginal discoloration in short-term clinical Class V restorations, longitudinal clinical trials should explore whether early marginal staining is predictive for future retention loss in non-carious cervical restorations.

Bond strength of orthodontic brackets using different light and self-curing cements

The purpose of the study was to evaluate the shear bond strength of stainless steel orthodontic brackets directly bonded to extracted human premolar teeth. Fifty teeth were randomly divided into ¿ve groups: (1) System One (chemically cured composite resin), (2) Light Bond (light-cured composite resin), (3) Vivaglass Cem (self-curing glass ionomer cement), (4) Fuji Ortho LC (light-cured glass ionomer cement) used after 37% orthophosphoric acid¿etching of enamel (5) Fuji Ortho LC without orthophosphoric acid¿etching. The brackets were placed on the buccal and lingual surfaces of each tooth, and the specimens were stored in distilled water (24 hours) at 378C and thermocycled. Teeth were mounted on acrylic block frames, and brackets were debonded using an Instron machine. Shear bond strength values at fracture (Nw)were recorded. ANOVA and Student-Newman-Keuls multiple comparison tests were performed (P , .05). Bonding failure site was recorded by stereomicroscope and analyzed by Chi-square test, selected specimens of each group were observed by scanning electron microscope. System One attained the highest bond strength. Light Bond and Fuji Ortho LC, when using an acid-etching technique, obtained bond strengths that were within the range of estimated bond strength values for successful clinical bonding. Fuji Ortho LC and Vivaglass Cem left an almost clean enamel surface after debracketing.

Dover, Kenneth James: "Homosexualidad griega", Barcelona

Publicado en inglés en el año 1978, el libro de K. J. Dover Homosexualidad griega se considera el primer ensayo serio dedicado a la homosexualidad masculina en la Grecia clásica. Éste y otros trabajos del mismo autor tuvieron influencia importante en los dos volúmenes centrados en la antigüedad de Histoire de la sexualité de Michel Foucault, de quién la edición española incluye como prólogo la reseña que el filósofo escribió a raíz de la edición francesa de la obra de K. J. Dover en 1982. La presente edición incluye, además, un actualizado apartado bibliográfico sobre la sexualidad en el mundo grecorromano y la homosexualidad en Grecia.

Habitar el universo: el tema del trabajo en el pensamiento politico de Simone Weil

La densidad de la biografía intelectual de Simone Weil encuentra su expresión en unaobra difícilmente clasificable, cuya riqueza de matices y el rigor de sus análisis y planteamientos conviven con una excepcional capacidad de percepción de los prolblemas a los que se ha enfrentado el siglo XX, así como de coherencia comprometida con las propuestas que ante éstos ella misma ofrece.Las páginas que siguen pretenden abordar el tema del trabajo, central en la vida y elpensamiento de esta autora, destacando, por una parte, la apertura de su perspectiva a cuestiones decisivas en la filosofía de este siglo, por otra, el modo en el que su experiencia se entreteje en la reflexión sobre este tema, entendido como actividad mediadora en la que se cifra la posibilidad de la existencia humana.

08011-007 Ludlow Creek Final Report

Brief Project Summary (no greater than this space allows): This project is located in the Ludlow Creek Watershed, a 9,827 acre sub-watershed of the Yellow River. Ludlow Creek is extremely fragile and unique because it is a karst watershed, containing an estimated 1,188 sinkholes and depressions. Ludlow Creek may arguably contain more sinkholes per acre than any other watershed in Iowa. Water sampling data shows sediment delivery and E.coli as being water quality impairments in Ludlow Creek. The goals of this project are to 1) Reduce sediment delivery by 40%, 2) Reduce animal waste run-off which may include E.coli and nutrients by 40%, and 3) Reduce the water quality impact that sinkholes have on this watershed. The following Best Management Practices (BMPs) will be implemented to target Ludlow Creek's water quality impairments: no-till, terraces, grade stabilization structures, manure systems, strearnbank stabilization, pasture management, and both sinkhole and stream buffers. Our goal is to implement a combination of approximately 62 BMPs in the Ludlow Creek Watershed. These landowners will receive 75% cost-share for each one of these practices. If we receive funding from this grant, we will reach this 75% cost-share allocation by leveraging WHIP or EQIP funds when available, for most of these practices. This application has been reviewed and approved by the Allamakee County Soil and Water Conservation District Commissioners.

Investigation of Field Corrosion Performance and Bond/Development Length of Galvanized Reinforcing Steel, TR-666, 2014

In reinforced concrete systems, ensuring that a good bond between the concrete and the embedded reinforcing steel is critical to long-term structural performance. Without good bond between the two, the system simply cannot behave as intended. The bond strength of reinforcing bars is a complex interaction between localized deformations, chemical adhesion, and other factors. Coating of reinforcing bars, although sometimes debated, has been commonly found to be an effective way to delay the initiation of corrosion in reinforced concrete systems. For many years, the standard practice has been to coat reinforcing steel with an epoxy coating, which provides a barrier between the steel and the corrosive elements of water, air, and chloride ions. Recently, there has been an industry-led effort to use galvanizing to provide the protective barrier commonly provided by traditional epoxy coatings. However, as with any new structural product, questions exist regarding both the structural performance and corrosion resistance of the system. In the fall of 2013, Buchanan County, Iowa constructed a demonstration bridge in which the steel girders and all internal reinforcing steel were galvanized. The work completed in this project sought to understand the structural performance of galvanized reinforcing steel as compared to epoxy-coated steel and to initiate a long-term corrosion monitoring program. This work consisted of a series of controlled laboratory tests and the installation of a corrosion monitoring system that can be observed for years in the future. The results of this work indicate there is no appreciable difference between the bond strength of epoxy-coated reinforcing steel and galvanized reinforcing steel. Although some differences were observed, no notable difference in either peak load, slip, or failure mode could be identified. Additionally, a long-term monitoring system was installed in this Buchanan County bridge and, to date, no corrosion activity has been identified.

Relacions especials entre germans

Aquest projecte tracta sobre la relació entre germans quan un d’ells és discapacitat. Podríem dir que la relació que s’estableix entre ells és “especial”? Aquesta ha estat la pregunta que m’ha portat a estudiar els diferents factors que influeixen en una relació d’aquest tipus. Per tal de poder comprovar el que diuen els estudis fets fins al moment, he analitzat dos casos, tots dos amb contextos molt diferenciats, i n’he tret unes conclusions amb la finalitat de respondre a la pregunta inicial. Quan hi ha un fill amb discapacitat a la família, l’atenció que aquest requereix és tan gran que sovint els germans tenen la sensació de sentir-se inferiors, culpables, etc. A tots aquests sentiments cal prestar-hi certa atenció de manera que la situació no els sigui negativa. Els tallers de germans, organitzats per associacions i escoles especialitzades amb el tema, contribueixen a treballar amb tots aquests germans, els sentiments i les emocions i així enfortir el vincle entre germans.

Tema y narración en Eyes Wide Shut

A partir de la complejidad argumental y temática de la película Eyes Wide Shut, dirigida por Stanley Kubrick, se presenta una propuesta interpretativa que analiza la relación entre el tema de la película, la trama narrativa y la novela en que se basa, Traumnovelle (Relato soñado), de Arthur Schnitzler. La estructura argumental se sostiene en un elemento temático específico, los impulsos sexuales de una pareja –y los sueños y las fantasías vinculados–, en una trama en la que se suceden episodios que representan estos impulsos. Las escenas proyectan las tendencias del inconsciente de los personajes (en sueños, en fantasías y también en situaciones dudosamente reales) de forma cada vez más intensa, hasta llegar al anticlímax de cotidianidad con que concluye la película.