Abstract. The recognition of the potential of technology for the teaching
and learning of mathematics has encouraged many studies around
technology. In all these studies, the integration, the utilization or the use of
technology is (or should be) necessarily an important element. In this paper
I consider the most common terminologies present in research and the
meaning assigned to them, based on a research review and on the analysis
of the studies presented in SIEM over the last five years. The conclusions
reached suggest a diversity of understandings and a lack of explicitness of
these understandings. However, different types of technology use seem to be
recognized, usually associated with continuity or change of practices. The
teacher's role and a more directive or more student-centered approach,
associated with a change in the proposed tasks, are also mentioned. In what
concerns to the terminology adopted, there is great diversity, with cases of
differentiation in terms of some of the elements listed and cases of adoption
of multiple terms with apparently identical meanings.

Resumo. O reconhecimento das potencialidades da tecnologia para o
ensino e aprendizagem da Matemática tem motivado diversos estudos em
torno da tecnologia. Em todos eles a integração, a utilização ou o uso que é
feito da tecnologia é (ou deveria ser) necessariamente um elemento
importante. Neste artigo procuro ponderar as terminologias mais comuns
na investigação e o significado que lhes é atribuído, partindo de uma
revisão de literatura e analisando os estudos apresentados no SIEM nos
últimos cinco anos. As conclusões alcançadas apontam para uma
diversidade de entendimentos e para uma ausência de explicitação desses
entendimentos. Ainda assim, parecem ser reconhecidos diferentes tipos de
utilização da tecnologia, geralmente associados à manutenção ou alteração
das anteriores práticas. O papel do professor e o assumir de uma postura
mais diretiva ou mais centrada no aluno, associada a uma alteração
relativamente às tarefas propostas, são igualmente referidos. Quanto à
terminologia adotada, a diversidade é grande, com casos de diferenciação
em função de alguns dos elementos referidos e com casos de adoção de
múltiplos termos aparentemente com significados idênticos.

Here we describe a new partial sauropod skeleton from the late Kimmeridgian (Late Jurassic) of the Lourinhã Formation, central west Portugal. The closely associated specimen comprises a complete tooth (with root), a fragment of cervical neural arch, an anterior chevron, and an almost complete right pectoral girdle and forelimb. The new sauropod, Zby atlanticus, n. gen. et sp., can be diagnosed on the basis of four autapomorphies, including a prominent posteriorly projecting ridge on the humerus at the level of the deltopectoral crest. Nearly all anatomical features indicate that Zby is a non-neosauropod eusauropod. On the basis of several characters, including tooth morphology, extreme anteroposterior compression of the proximal end of the radius, and strong beveling of the lateral half of the distal end of the radius, Zby appears to be closely related to Turiasaurus riodevensis from approximately contemporaneous deposits in eastern Spain. However, these two genera can be distinguished from each other by a number of features pertaining to the forelimb. Whereas previously described Late Jurassic Portuguese sauropods show close relationships with taxa from the contemporaneous Morrison Formation of North America, it appears that turiasaurians were restricted to Europe. All adult sauropods recovered in the Late Jurassic of Portugal thus far are very large individuals: it is possible that the apparent absence of small- or medium-sized adult sauropods might be related to the occupation of lower-browsing niches by non-sauropods such as the long-necked stegosaur Miragaia longicollum.

The color sensing ability of a data acquisition prototype system integrating a 32 linear array of 1D amorphous silicon position sensitive detectors (PSD) was analyzed. Besides being used to reproduce a 3D profile of highly reflective surfaces, here we show that it can also differentiate primary red, green, blue (RGB) and derived colors. This was realized by using an incident beam with a RGB color combination and adequate integration times taking into account that a color surface mostly reflects its corresponding color. A mean colorimetric error of 25.7 was obtained. Overall, we show that color detection is possible via the use of this sensor array system, composed by a simpler amorphous silicon pin junction. © 2013 Elsevier B.V. All rights reserved.