On-line learning networks: Framework and scenarios

The idea of using the internet as a platform to mediate social interactions and learning at different levels has progressively affirming itself, and this has given rise to a huge number of spontaneous and planned collectives, which are often described as on-line learning networks. On-line learning networks create value through the combination of content and people’s knowledge. They can vary widely in the strength and permanence of their connections and the resources necessary to maintain them. Aspects of both a pragmatic and social nature need to be carefully considered in the process of initiation of on-line learning communities. This paper considers learning networks from the perspective of the potential they offer to the strengthening of relationships among institutions, groups, and people sharing a common interest in computer-enhanced learning. Some case studies are analysed and an analytical framework is sketched out to guide observations and to provide a lens through which case studies can be interpreted. The final goal is to delineate a reference for identifying strong and weak elements in virtual networks and to examine under what conditions they are succeeding. In addition, some possible scenarios for on-line networks are delineated along two main lines: the organisation and structure of the network and its level of establishment.

Comparison Between Colorimetry and Sensory Panel in Studying Similarity Between Roman and Integration Bricks,Assisted by Multivariate Data Treatment

ABSTRACT

The restoration of the Roman building of the third-fourth century CE called Minerva Medica, in Rome, highlighted a problem concerning the choice of the color of the bricks for integration. Current conservation practice in Italy favours a restoration that as much as possible is consistent with the original but leaves some visible differences to a careful observer. Color measurement is usually performed using portable spectrocolorimeters that provide the reflectance spectrum and also colorimetric parameters such as L* a* b*, h* L* C*, RGB, etc. In other sectors, such as for olive oils, for wines, and also for the colors of commercial products, sensory panels are used to provide results of difference/similarity and are known to be similar to observations made by consumers. In this study, data from a top quality spectrocolorimeter and from a sensory panel are compared. Twenty non-professional people were involved in the comparison between seven restoration bricks and three ancient Roman bricks from the studied site. Observations took place in a room with controlled lighting, and each observer filled out a sensory card using about 2000 known comparison colors. Comparison of the results was carried out with graphic methods and by means of cluster analysis. The results show that the sensory panel could be a useful alternative to colorimetry, while cluster analysis allowed a significant response to questions posed by conservation professionals, and was confirmed by other graphic-statistical methods.     

Influence of surface roughness on the color of dental-resin composites

This study deals with the influence of surface roughness on the color of resin composites. Ten resin composites (microfilled, hybrid, and microhybrid) were each polished with 500-grit, 1 200-grit, 2 000-grit, and 4 000-grit SiC papers. The roughness parameter (R _a) was measured using a Plμ confocal microscope, and field-emission scanning electron microscope (Fe-SEM) images were used to investigate filler morphology. Color was measured using a spectroradiometer and a D65 standard illuminant (geometry diffuse/0° specular component excluded (SCE) mode). Surface roughness decreased with grit number and was not influenced by filler size or size distribution. A significant influence of R _a on lightness (L*) was found. Lightness increased with decreases in roughness, except for specimens that underwent polishing procedure 4 (PP4; 500-grit, 1 200-grit, 2 000-grit, and 4 000-grit SiC papers consecutively). Generally, it was found that surface roughness influenced the color of resin composites. The composites that underwent PP1 (500-grit SiC paper) exhibited significant differences in chroma (C*), hue (h°), and lightness (L*) compared to composites that underwent PP3 (500-grit, 1 200-grit, and 2 000-grit SiC papers consecutively) and PP4. Color difference (ΔE*) between the polishing procedures was within acceptability thresholds in dentistry.     

Visions of value: Leading the development of a view of the University Library in the 21st century

Over the course of 2018 the University of Sheffield Library conducted a series of interviews and workshops with stakeholders as part of a strategic project to reflect on the value of the university library in the 21st century. Using a mixed methodology, participants were asked to reflect upon the future Higher Education (HE) environment for the university and, for academic participants, their discipline. In this context participants were also asked to reflect upon the future value of the University Library in a series of questions designed to elicit value statements using a tool which the project group have called the ‘Wheel of Value’. The resulting reflections upon the future environment have been grouped into four categories reflecting the drivers for change; Digitalisation, Student Experience, Diversification and Collaboration recognizing that there is considerable overlap and interconnection between these. The reflections on the future value of the library are presented by Wheel of Value higher order categorization. This approach proved useful in eliciting responses from participants in the face of recognized difficulty in getting beyond current views of the library and the approach is recommended to other universities looking to carry out a similar project. The results of this research will be used to inform the development of a view of the library for the purpose of engaging with our university community and key partners.     

Do Varieties of Spanish Influence U.S. Spanish–English Bilingual Children's Friendship Judgments?

Latinos are the largest minority group in the United States (U.S. Census, 2014), yet this term comprises individuals from multiple ethnicities who speak distinct varieties of Spanish. We investigated whether Spanish–English bilingual children (N = 140, ages 4–17) use Spanish varieties in their social judgments. The findings revealed that children distinguished varieties of Spanish but did not use Spanish dialects to make third-person friendship judgments until 10–12 years; this effect became stronger in adolescence. In contrast, young children (4–6 years) made friendship judgments based on a speaker's language (English, Spanish). Thus, using language varieties as a social category and as a basis for making social inferences is a complex result of multiple influences for Spanish-speaking children growing up bilingual in the United States.     

Leadership coaching: a multiple-case study of urban public charter school principals’ experiences

The purpose of our multi-case study was to understand the experiences of non-novice New York City and Washington, DC public charter school principals who had participated in leadership coaching as a component of their leadership development. Eight New York City and Washington DC public charter school principal cases were selected through purposeful sampling. Data were collected through semi-structured interviews, documents, and artifacts, which were analyzed, coded and grouped into three broader themes: the coaching process, the impact of coaching, and principal leader identity construction. The findings supported the following conclusions: (a) Participants’ experiences of coaching were inconsistent with the coaching literature; (b) The impact of coaching was shaped by perceived competencies of the coach and the structure of the coaching session; and (c) Participants’ leader identity construction was supported through the process of coaching.