Thermal shock resistance of silicon oxynitride

The thermal shock resistance of Si2N2O refractory material was studied. The thermal expansion coeff. is 3.55x10 to the -6th power at 20 to 800 C and 2.86x10 to the -6th power m/m/deg at 20 to 200 C. The breaking loads are high at high stress. Young's modulus E and the shear modulus G decrease linearly with increasing porosity. For dense material E sub o approx. = 216,500 N/mm2 and G approx = 90,600 N/mm2. The Vickers hardness of the dense material is comparable to that of sapphire. The results on thermal shock show that R, the breaking load, stays constant for T T sub c, the first cracks appear and R decreases sharply for T=T sub c. As the severity of the thermal shock is increased at T T sub c, a small no. of new, large-size cracks appears. The shock's cumulative effect is negligible, and repeated shocks do not change the cracks. The low values of the thermal expansion coefficient and Young's modulus and the high tension breaking load are considered. Sintered Si2N2O with 5% MgO shows excellent cracking resistance under thermal shock

SAMP, the Simple Application Messaging Protocol: Letting applications talk to each other

SAMP, the Simple Application Messaging Protocol, is a hub-based communication standard for the exchange of data and control between participating client applications. It has been developed within the context of the Virtual Observatory with the aim of enabling specialised data analysis tools to cooperate as a loosely integrated suite, and is now in use by many and varied desktop and web-based applications dealing with astronomical data. This paper reviews the requirements and design principles that led to SAMP's specification, provides a high-level description of the protocol, and discusses some of its common and possible future usage patterns, with particular attention to those factors that have aided its success in practice.Comment: 12 pages, 3 figures. Accepted for Virtual Observatory special issue of Astronomy and Computin

Feasibility of Hair Collection for Cortisol Measurement in Population Research on Adolescent Health

Background: Black–White disparities in adolescent health are widespread and thought to be explained, in part, by exposure to chronic stress. Cortisol assayed from hair is increasingly recognized as a valid and reliable measure for chronic physiological stress, but the feasibility of collecting hair among large probability samples of diverse adolescents is unknown. Purpose: The aim of the study was to investigate participation in hair collection for cortisol analyses in a probability sample of racially and socioeconomically diverse adolescents, including the extent to which sociodemographic factors and adverse exposures were associated with participation. Methods: The study included a probability sample of 516 adolescents conducted in conjunction with a prospective cohort study on adolescent health. Data were collected over 1 week via in-home interviews, ecological momentary assessment, global positioning system methods, and in-home hair collection at the end of the week. Results: Of the 516 eligible youth, 471 (91.3%) participated in the hair collection. Of the 45 youth who did not provide hair samples, 18 had insufficient hair, 25 refused, and 2 did not participate for unknown reasons. Multivariable logistic regression results indicated that non-Hispanic Black youth were less likely than their non-Hispanic White peers to participate due to insufficient hair or refusal (OR = 0.24, 95% CI [0 .09, 0.60]). Despite lower rates of participation, the proportion of Black youth in the participating sample was representative of the study area. No significant differences in participation were found by other sociodemographic characteristics or adverse exposures. Conclusions: Hair collection for cortisol measurement is feasible among a probability sample of racially and socioeconomically diverse adolescents. Hair cortisol analyses may accelerate research progress to understand the biological and psychosocial bases of health disparities

Quintus Aurelius Symmachus and the immortalization of a paradigm

En el presente estudio se pretende comprender los motivos por los cuales Quinto Aurelio Símaco buscó asegurar la pervivencia de los valores e ideales que conformaron la mentalidad del ordo senatorial, "la mejor agrupación del género humano" (Símaco, Cartas, L I, 52), patrocinando ante las autoridades imperiales la reposición del altar de la Victoria en la Curia de Senado romano. Este trabajo se basa en el análisis de la tercera relatio simaquiana referida a la temática investigada. A partir de la lectura crítica de tal documentación, se intentará inferir el verdadero alcance de los sucesos relacionados con la defensa de los valores tradicionales del ordo senatorial inmersa en la compleja problemática religiosa, social y política de la cuarta centuria.The present study aims to understand the reasons why Quintus Aurelius Symmachus sought to ensure the survival of the values and ideals that conformed the mentality of the senatorial ordo, "the best grouping of mankind" (Symmachus, Letters, LI, 52), supported in front of the imperial authorities the replenishment of the altar of Victory in the Roman Senate Curia. This work is based on the analysis of the third relatio simaquiana referred to the subject investigated. From the critical reading of this documentation, we will try to infer the true extent of the events related to the defense of the traditional values of the senatorial ordo immersed in a complex problematic in religious, social and political life of the fourth century.Fil: Boch, Viviana. Universidad Católica Argentin

Abdullah's Blogging: A generation 1.5 student enters the blogosphere

Blogging has emerged as one of the most popular forms of online discourse. The ease and lack of expense in setting up blogs has raised intriguing possibilities for language learning classrooms. The unique nature of their architecture and their low cost have not only affected how students can publish and distribute their work to a wider audience but also how they see themselves as authors. This paper focuses on the use of blogs in an L2 writing course concentrating on the controversies surrounding plagiarism. Blogs were used as a means of generating ideas for their academic papers and as texts that could be cited in their papers. This paper analyzes the blogs of a Somali immigrant student to explore blogs' relationship to the development of his academic writing. His purposes and strategies for using blogs are discussed both as a way of seeing the variety of writing strategies he developed in his blogs, as well as what his use of blogs could tell his teachers about the strengths and weaknesses of his writing. The paper attempts to improve our understanding of how blogging in L2 composition courses can contribute to the development of a student’s writing

Fight Like a Girl: Diversity in the Womens Rights Movement

This presentation will focus on the music video Fight Like a Girl by Zolita. Written the day after Donald Trump became president of the United States, this song discusses how necessary it is for the women in our country to stand up for our own rights. The music video features a variety of women, from businesswomen to pole dancers, from Muslim women to transgender women. In this presentation I will discuss how the music video for Fight Like a Girl emphasizes the fact that all women are equally deserving of rights and respect, and we all must stand together if we hope for change