Dissimilar metals joint evaluation

Dissimilar metals tubular joints between 2219-T851 aluminum alloy and 304L stainless steel were fabricated and tested to evaluate bonding processes. Joints were fabricated by four processes: (1) inertia (friction) weldings, where the metals are spun and forced together to create the weld; (2) explosive welding, where the metals are impacted together at high velocity; (3) co-extrusion, where the metals are extruded in contact at high temperature to promote diffusion; and (4) swaging, where residual stresses in the metals after a stretching operation maintain forced contact in mutual shear areas. Fifteen joints of each type were prepared and evaluated in a 6.35 cm (2.50 in.) O.D. size, with 0.32 cm (0.13 in.) wall thickness, and 7.6 cm (3.0 in) total length. The joints were tested to evaluate their ability to withstand pressure cycle, thermal cycle, galvanic corrosion and burst tests. Leakage tests and other non-destructive test techniques were used to evaluate the behavior of the joints, and the microstructure of the bond areas was analyzed

Dinosaur tracks from the Kilmaluag Formation (Bathonian, Middle Jurassic) of Score Bay, Isle of Skye, Scotland, UK

Tracks of a juvenile theropod dinosaur with footprint lengths of between 2 and 9 cm as well as adults of the same ichnospecies with footprints of about 15–25 cm in length were found in the Bathonian (Middle Jurassic) Kilmaluag Formation of Score Bay, northwestern Trotternish Peninsula, Isle of Skye, Scotland, UK. Two footprint sizes occur together on the same bedding plane in the central portion of Score Bay, both in situ and on loose blocks. Another horizon containing footprints above this was also identified. The footprints from the lowest horizon were produced in a desiccated silty mud that was covered with sand. A close association of both adults and juveniles with similar travel direction indicated by the footprints may suggest post-hatching care in theropod dinosaurs. Other footprints, produced on a rippled sandy substrate, have been found on the slightly higher bedding plane at this locality. Loose blocks found 130 m to the northeast in the central part of Score Bay have not been correlated with any in situ sediments, but were preserved in a similar manner to those from the higher bedding plane. These tracks represent the youngest dinosaur remains yet found in Scotland

Spatial variation and temporal trends of testicular cancer in Great Britain

Increases in testicular cancer incidence have been reported in several countries over a long period. Geographical variability has also been reported in some studies. We have investigated temporal trends and spatial variation of testicular cancer at ages 20–49 in Britain. Temporal trends in testicular cancer incidence were examined, 1974 to 1991 and in mortality, 1981–1997. Spatial variation in incidence was analysed across electoral wards, 1975 to 1991. We used Poisson regression to examine for regional and socio-economic effects and Bayesian mapping techniques to analyse small-area spatial variability. Incidence increased from 6.5 to 11.1 per 100 000 in men at ages 20–34, and from 5.6 to 9.7 per 100 000 in men at ages 35–49, while mortality declined by 50% in both age groups. Risks of testicular cancer varied across regional cancer registries, ranging from 0.79 (95% CI: 0.73–0.84) to 1.32 (95% CI: 1.25–1.38), and was higher in the most affluent compared with the most deprived areas. Analyses within 2 regions (one predominantly urban, the other predominantly rural) did not indicate any localized geographical clustering. The increasing incidence contrasted with a decreasing mortality over time in Great Britain, similar to that found in other countries. The higher risk in more affluent areas is not consistent with findings on social class at the individual level. The absence of any marked geographical variability at small area scale argues against a geographically varying environmental factor operating strongly in the aetiology of testicular cancer. © 2001 Cancer Research Campaign http://www.bjcancer.co

A satisfação vital: sua relação com o preconceito, a identidade nacional, a autoestima e o bem-estar material, em imigrantes

El propósito de esta investigación fue estudiar la relación de la satisfacción vital con varios factores psicosociales corrientemente vinculados a los procesos de migración internacional. En concreto, este estudio exploró la relación de la satisfacción vital - componente cognitivo del bienestar subjetivo - con las variables prejuicio grupal percibido, discriminación personal percibida, autoestima global personal, identidad nacional y bienestar material percibido. La investigación, de tipo empírico y cuantitativo, se realizó a través de un muestreo no probabilístico con inmigrantes colombianos en varias ciudades del Ecuador (N = 185). Confirmando las hipótesis, se halló una relación positiva entre la satisfacción vital, el bienestar material percibido y la autoestima. Se confirmó así mismo una relación negativa entre la satisfacción vital, la discriminación personal percibida y la identidad nacional. Estas mismas variables; la autoestima, el bienestar material percibido, la discriminación personal percibida y la identidad nacional, emergieron como predictoras de la satisfacción vital. No se confirmó, en cambio, la relación negativa hipotetizada entre la satisfacción vital y el prejuicio grupal percibido. Se hace un análisis de dichos resultados desde la literatura psicosocial.O propósito desta pesquisa foi estudar a relação da satisfação vital com vários fatores psicossociais correntemente vinculados aos processos de migração internacional. Em concreto, este estudo explorou a relação da satisfação vital - componente cognitivo do bem-estar subjetivo - com as variáveis preconceito grupal percebido, discriminação pessoal percebida, autoestima global pessoal, identidade nacional e bem-estar material percebido. A pesquisa, de tipo empírica e quantitativa, foi realizada através de um amostra não probabilística com imigrantes colombianos em várias cidades do Equador (N = 185). Confirmando as hipóteses, foi encontrada uma relação positiva entre a satisfação vital, o bem-estar material percebido e a autoestima. Foi confirmada assim uma relação negativa entre a satisfação vital, a discriminação pessoal percebida e a identidade nacional. Estas mesmas variáveis; a autoestima, o bem-estar material percebido, a discriminação pessoal percebida e a identidade nacional, emergiram como preditoras da satisfação vital. Contudo, não foi confirmada a relação negativa hipotética entre a satisfação vital e o preconceito grupal percebido. É feita uma análise desses resultados desde a literatura psicossocial.The aim of this research was to study the relationship between life satisfaction and various psychosocial variables usually linked to international migration processes. Specifically, this study explored the relationship between life satisfaction-a cognitivedimension of subjective well-being- and perceived group prejudice, perceived personal discrimination, global personal self-esteem, national identity and perceived material well- being. The research, of empirical quantitative type, was conducted with a non-probabilistic sample of Colombian migrants at several cities of Ecuador. As expected, the hypothesis that life satisfaction was positively related to self -esteem and perceived material well-being was confirmed. Also, a negative correlation was confirmed between life satisfaction, perceived personal discrimination and national identity. Results show that the variables self-esteem, perceived material well-being, perceived personal discrimination and national identity are significant predictors of life satisfaction. Findings didn´t confirm the expected negative association between life satisfaction and perceived group prejudice. Results are analyzed from a psychosocial perspective

There is More to Gesture Than Meets the Eye: Visual Attention to Gesture’s Referents Cannot Account for Its Facilitative Effects During Math Instruction

Teaching a new concept with gestures – hand movements that accompany speech – facilitates learning above-and-beyond instruction through speech alone (e.g., Singer & GoldinMeadow, 2005). However, the mechanisms underlying this phenomenon are still being explored. Here, we use eye tracking to explore one mechanism – gesture’s ability to direct visual attention. We examine how children allocate their visual attention during a mathematical equivalence lesson that either contains gesture or does not. We show that gesture instruction improves posttest performance, and additionally that gesture does change how children visually attend to instruction: children look more to the problem being explained, and less to the instructor. However looking patterns alone cannot explain gesture’s effect, as posttest performance is not predicted by any of our looking-time measures. These findings suggest that gesture does guide visual attention, but that attention alone cannot account for its facilitative learning effects

Drosophila Morgana is an Hsp90-interacting protein with a direct role in microtubule polymerisation

Morgana/CHORDC1/CHP1 is a highly conserved CHORD (Cysteine and Histidine Rich Domain) containing protein that has been proposed to function as an Hsp90 cochaperone. Morgana deregulation promotes carcinogenesis in both mice and humans while, in Drosophila, loss of morgana (mora) causes lethality and a complex mitotic phenotype that is rescued by a human morgana transgene. Here, we show that Drosophila Morgana localizes to mitotic spindles and co-purifies with the Hsp90- R2TP-TTT super-complex, and with additional well-known Hsp90 co-chaperones. Acute inhibition of Morgana function in the early embryo results in a dramatic reduction in centrosomal microtubule stability, leading to small spindles nucleated from mitotic chromatin. Purified Mora binds microtubules directly and promotes microtubule polymerization in vitro, suggesting that Mora directly regulates spindle dynamics independently of its Hsp90 co-chaperone role

Ontologies, Mental Disorders and Prototypes

As it emerged from philosophical analyses and cognitive research, most concepts exhibit typicality effects, and resist to the efforts of defining them in terms of necessary and sufficient conditions. This holds also in the case of many medical concepts. This is a problem for the design of computer science ontologies, since knowledge representation formalisms commonly adopted in this field do not allow for the representation of concepts in terms of typical traits. However, the need of representing concepts in terms of typical traits concerns almost every domain of real world knowledge, including medical domains. In particular, in this article we take into account the domain of mental disorders, starting from the DSM-5 descriptions of some specific mental disorders. On this respect, we favor a hybrid approach to the representation of psychiatric concepts, in which ontology oriented formalisms are combined to a geometric representation of knowledge based on conceptual spaces

Educational recommendations for the conduct, content and format of EULAR musculoskeletal ultrasound Teaching the Teachers Courses

To produce educational guidelines for the conduct, content and format of theoretical and practical teaching at EULAR musculoskeletal ultrasound (MSUS) Teaching the Teachers (TTT) Courses

Territorial Tactics: The Socio-spatial Significance of Private Policing Strategies in Cape Town

This paper analyses the policing strategies of private security companies operating in urban space. An existing literature has considered the variety of ways that territory becomes of fundamental importance in the work of public police forces. However, this paper examines territory in the context of private security companies. Drawing on empirical research in Cape Town, it examines how demarcated territories become key subjects in private policing. Private security companies are responsible for a relatively small section of the city, while in contrast the public police ultimately have to see city space as a whole. Hence, private policing strategy becomes one of displacement, especially of so-called undesirables yielding a patchworked public space associated with private enclaves of consumption. The conclusions signal the historical resonances and comparative implications of these political-legal-security dynamics. © 2013 Urban Studies Journal Limited