Carbon formation on steam reforming catalysts

Imperial Users onl

A função quadrática: variação, transparência e duas tipologias de exemplos.

El uso de ejemplos es un recurso que todos profesores de matemáticas utilizan para enseñar los contenidos matemáticos. Aunque las estrategias metodológicas utilizadas puedan ser muy diferentes, la ejemplificación que contienen puede tener aspectos comunes y, en este artículo, presentamos dos de esos aspectos: la variación y la transparencia. Estas dos características que los ejemplos presentan pueden ser concertadas de modo que las generalizaciones y abstracciones sean más fácilmente alcanzadas por los alumnos; en particular, mostramos esa simbiosis en el caso del estudio de las funciones cuadráticas. Sin embargo, ejemplificaciones diferentes producen también tipos de ejemplos diferentes. En el estudio aquí descrito encontramos diferencias importantes que permitieron identificar dos tipologías de ejemplos muy diferentes, aunque con el mismo objetivo e igualmente eficaces

Performance of stones under different conditions : a study of metro stations

The study of stone alterations in the Lisbon Metro stations allowed the discussion of the influence in the development of these alterations of stones characteristics and the actual conditions to which the stones are subjected. Alterations occur under what can be considered the usual conditions of use but also under abnormal situations that must be taken into account given its frequency. The diverse situations identified are considered in the discussion of possible recommendations bearing in mind the actual situations found at the stations.Financiado pela Fundação para a Ciência e a Tecnologia com fundos nacionais (programa plurianual de financiamento de unidades de investigação)

Performance of stones under different conditions: a study of metro stations

Fundação para a Ciência e a Tecnologia (FCT

Work risks in pandemic times

The difficulties in finding regular and stable employment and the resulting social consequences have reached worrying dimensions in recent years. The growing demand for education and the hierarchy and regulation of employment continue to show increasingly obvious difficulties in absorbing a growing skilled workforce. In this context, the emergence of the covid-19 pandemic has brought new challenges worldwide: the establishment of telework and the intense decline in economic activity were some of the most evident cross-cutting changes, with direct consequences for the emergence of new forms and policies to support the employment. In this context, we try, here, to reflect how young graduates of polytechnic higher education in Portugal project the future employment risks, particularly in terms of unemployment, new forms and conditions of the exercise of work, adaptations and changes in terms of content, contracts and timetables, keeping in mind their gender, age, academic training areas. This knowledge is crucial to the content and pedagogies adaption in academia to help develop the needed competences of the future work labour force. It will also be possible to observe how the entrepreneurial skills or the entrepreneurship path is in their future.info:eu-repo/semantics/publishedVersio

Childhood history of abuse and child abuse potential: the role of parent’s gender and timing of childhood abuse

It has been suggested that being physically abused leads to someone becoming a perpetrator of abuse which could be associated to parents' gender, timing of the physical abuse and specific socio-demographic variables. This study aims to investigate the role the parents' gender, timing of childhood abuse and socio-demographic variables on the relationship between parents' history of childhood physical abuse and current risk for children. The sample consisted of 920 parents (414 fathers, 506 mothers) from the Portuguese National Representative Study of Psychosocial Context of Child Abuse and Neglect who completed the Childhood History Questionnaire and the Child Abuse Potential Inventory. The results showed that fathers had lower current potential risk of becoming physical abuse perpetrators with their children than mothers although they did not differed in their physical victimization history. Moreover, the risk was higher in parents (both genders) with continuous history of victimization than in parents without victimization. Prediction models showed that for fathers and mothers separately similar socio-demographic variables (family income, number of children at home, employment status and marital status) predicted the potential risk of becoming physical abuses perpetrators. Nevertheless, the timing of victimization was different for fathers (before 13 years old) and mothers (after 13 years old). Then our study targets specific variables (timing of physical abuse, parents' gender and specific socio-demographic variables), which may enable professionals to select groups of parents at greater need of participating in abuse prevention programs.This work was supported by the Portuguese Foundation of Science and Technology through a research grantto the second author (POCTI/PSI/14276/1998), the Spanish Ministry of Health, Social Services and Equality, National Drug Plan (2012/001) and by the Regional Government of Valencia, Programa VALi+d para investigadores en formacion (ACIF/2011/075), research groups and networks of excellence (PROMETEO/2011/048; ISIC/2013/001)

The Consumption of DHA During Embryogenesis as an Indicative of the Need to Supply DHA During Early Larval Development: A Review

The establishment of an adequate larval diet for crustacean and fish often involves a series of time-consuming and expensive trial and errors. Despite being nutritionally poor, rotifers and Artemia are the most commonly used preys in larviculture. Whether (and to what extent) the prey needs to be enriched with essential fatty acids differs from species to species. We hypothesized that the DHA content of a newly spawned eggs and its consumption through embryogenesis can be a good indicator of the need to enrich the prey with DHA. In order to assess this hypothesis, we performed a search in the scientific literature and compared DHA consumption through embryogenesis with larval culture success with unenriched and DHA-enriched Artemia nauplii, respectively a prey poor and rich in DHA of fish and crustacean. Data available from previously published studies suggests that, higher the consumption of DHA during embryonic development, greater the requirement of a diet rich in DHA during early larval development; and when, although present, DHA is not consumed during embryogenesis, larvae seem to be able to successfully develop with diet poor in DHA (i.e. using solely their reserves). Further studies will be necessary to better validate this hypothesis, but if confirmed, it may allow a reduction of time and costs associated with the establishment of an adequate larval diet

Job conditions and expectations of young graduates in Covid-19 contexts

Work represents a condition of integration, selection, or exclusion of individuals in modern societies. Over the past few decades, we have seen a progressive erosion of the full-time employment model and the emergence of particular forms of employment. More than a process delimited by economic issues, access to work is fundamentally presented as a social process, inducer or reducer of life paths. The current times and what is predicted for the future, goes through a concept that appears described in the Human Development Index Report, 2022, published by the United Nations, Anthropocene. This concept defines what they consider to be the current time and what is predicted for the future: uncertain times, unstable lives, shaping the future in a changing world. The report examines what living in this uncertainty means for human development and how we can continue to thrive despite it. Thus, education territories increasingly have to be concerned with the development of skills that facilitate adaptation to the permanent state of "uncertainty". Emotional literacy appears as a tool that enhances these skills and should be a concern in education and training areas. In this context we are seeing a growing appreciation of educational projects and the initial expectations of young people and their families. The investment of young people and their families in education is increasing progressively, in a context of growing competition from the education system and the labour market. The transition to work for young graduates of higher education is now a major challenge. The analysis of this process has huge complexity in a global covid-19 pandemic context. We seek to highlight and understand the professional availability, perspectives, and expectations of young graduates of polytechnic education (Guarda, Leiria and Viseu) who perform a regular professional activity and also their future professional and educational projects.info:eu-repo/semantics/publishedVersio