A new family of high viscosity polymeric dispersions for cleaning easel paintings

The procedures for making and applying a new family of high viscosity aqueous polymeric dispersions based on poly(vinyl alcohol)-borax (PVA-borax) matrices are presented. A specific system of this type has been used to remove an oxidized varnish coating from the surface of “Coronation of the Virgin with Saints”, a 15th century egg tempera painting on wood by Neri di Bicci (Florence, 1418–1492). FTIR spectra showed that the oxidized varnish was constituted of highly aged shellac resin. Good cleaning performance was attained when the liquid portion of the dispersion consisted of a mixture of water and acetone. Rheological investigations indicate that the acetone content does not affect the mechanical properties of the polymeric dispersion. Those mechanical properties permit easy removal of the cleaning agent simply by peeling it from the surface by means of a forceps or spatula once it has carried out its cleaning function. Optical microscopic and FTIR investigations show that the cleaning agent is able to remove the oxidized varnish coating from the surface of the Neri di Bicci painting without leaving detectable residues.     

Digital Archival Image Collections: Who Are the Users?

Archival digital image collections are a relatively new phenomenon in college library archives. Digitizing archival image collections may make them accessible to users worldwide. There has been no study to explore whether collections on the Internet lead to users who are beyond the institution or a comparison of users to a national or international audience. This study of the Orang Asli Archive, a repository for anthropological, historical, journalistic, and other documentary sources relevant to Orang Asli peoples and cultures of Malaysia, examines the Web analytics of its digital archival image collections.     

Student-Generated Scientific Inquiry for Elementary Education Undergraduates: Course Development, Outcomes and Implications

While some researchers have argued for science classrooms that embrace open-inquiry by engaging students in doing science as scientists do (cf. National Research Council [NRC] 1996; Driver et al. in Sci Educ 84:287–312, 2000; Windschitl et al. in Sci Educ 87(1):112–143, 2008), others have argued that open-inquiry is impractical, ineffective, and perhaps even counter-productive towards promoting normative scientific ideas (cf. Kirschner et al. in Educ Psychol 41(2):75–86, 2006; Settlage in J Sci Teach Educ 18:461–467, 2007). One of the challenges in informing the debate on this issue is the scarcity of well-documented courses that engage students in open-inquiry characteristic of scientific research. This paper describes the design, implementation, and outcomes of such a course for undergraduates planning on becoming elementary teachers. The goal of the class was to immerse future teachers in authentic, open-inquiry (without specific learning goals related to scientific concepts) in hopes that students would come away with a deeper understanding of the nature of science (NOS) and improved attitudes towards science. Data collected from a variety of sources indicate that an authentic, open-inquiry experience is feasible to implement in an undergraduate setting, gives students a more sophisticated NOS understanding, improves students’ attitudes towards science and open-inquiry, and changes the way they intend to teach science in their future classrooms.     

Avoiding and Correcting Bias in Score-Based Latent Variable Regression With Discrete Manifest Items

This article considers models involving a single structural equation with latent explanatory and/or latent dependent variables where discrete items are used to measure the latent variables. Our primary focus is the use of scores as proxies for the latent variables and carrying out ordinary least squares (OLS) regression on such scores to estimate parameters in the structural equation. We are concerned with the bias in these OLS estimates; we present two approaches to deal with this bias. Extending the work of Skrondal and Laake (2001) Skrondal, A. and Laake, P. 2001. Regression among factor scores. Psychometrika, 66: 563–576. [Crossref], [Web of Science ®] , [Google Scholar] on continuous items, we derive sufficient conditions under which the use of scores based on item response theory leads to unbiased OLS estimates at the population level; we deem this approach “bias avoiding.” We also consider Croon's (2002) Croon, M. 2002. “Using predicted latent scores in general latent structure models”. In Latent variable and latent structure models, Edited by: Marcoulides, G. A. and Moustaki, I. 195–223. Mahwah, NJ: Lawrence Erlbaum Associates, Inc.  [Google Scholar] bias correction methodology for continuous items and explore its efficacy on discrete items; we deem this approach “bias correcting.” We illustrate the performance of the 2 approaches through numerical examples of large simulated data sets.     

Plowing in Rocky Land: Organizational Culture,Managed Change,and Quality Improvement in Selected Romanian Post-Communist Libraries

Romanian libraries have had a rich heritage of collecting and preserving materials in the domains of national and foreign history, literature, art, and science. During the communist regime they served as propaganda tools for the government's Marxist ideology. In post-communist Romania, there is a desire among some librarians to promote change from a system of limited access to information to a more open system that focuses on quality improvement of library services, operations, and organization. In their efforts to overcome the communist legacy to libraries in their country, some Romanian librarians—with local resources and support from international agencies—are implementing western managerial styles and services. This case study reflects the results, assessments, and recommendations from a survey conducted at a workshop of selected Romanian librarians in August 1998. Considerations for the implementation of needed changes are also included.     

A Teaching–Learning Sequence for the Special Relativity Theory at High School Level Historically and Epistemologically Contextualized

This paper discusses some topics that stem from recent contributions made by the History, the Philosophy, and the Didactics of Science. We consider these topics relevant to the introduction of the Special Relativity Theory (SRT) in high school within a contextualized approach. We offer an outline of a teaching?Clearning sequence dealing with the SRT within this frame of reference. Such a sequence was tried out on a group of high school students in Argentina. The results obtained seem to indicate that the proposal has been effective as regards the motivational aspects and the understanding students gained of some of its concepts.     

A longitudinal study of social relationships and networks in the transition to and within adulthood for vulnerable young adults at ages 24, 29 and 34 years: compensation,reinforcement or cumulative disadvantages?

This longitudinal study, spanning from 1995 through 2012, followed vulnerable youth from upper secondary school (T1) as they made the transition to their early twenties (T2), late twenties (T3) and mid-thirties (T4). We investigated their social network relationships in different phases of adult life, focusing mainly on factors that explain patterns of social adaptation. Internet-mediated relationships were also studied at T4. We found that attending special classes in upper secondary school explained the respondents’ risk of being in a small isolated and bonding network in their early twenties. In the transition from early to late twenties, the relative impact of a changed life situation, which increases the potential of network formation, is a resilience factor. Logistic regression analyses, however, showed that in the transition from T3 to mid-thirties, having intellectual disabilities was a risk factor for social isolation. In particular, males with intellectual disabilities or psychosocial difficulties at this age were isolated in small networks and less likely to be on Facebook/Twitter. A shift of factors in the explanatory model of the transition from school to adult life reflects the relative impact of contextual factors distant and closer in time, shedding light on the principle of social ties to others, linked lives and cumulative disadvantages across the life course.     

A Tale of Two Libraries: A Merger and Its Challenges. A Case Study

In 2005, representatives from Montgomery County Public Schools (MCPS), the Universities at Shady Grove (USG), and the University of Maryland Libraries, explored a potential partnership between their libraries. With different patrons and missions, merging the two library cultures and functions presented challenges and opportunities to administrators and librarians.

This study examines the dimensions and impact on both libraries. It will inquire whether it resulted in a limited, primarily administrative arrangement, or whether the libraries were able to achieve true collaboration. The findings highlight some issues libraries could take into account before embarking into a merger process.     

Comprehensive evaluation model: A tool for the evaluation of nontraditional educational programs

The Comprehensive Evaluation Model is a tool which can be used for the evaluation of nontraditional programs. This Model is useful in helping an educator address issues related to program quality, cost-effectiveness and program improvement. The Model is utilization focused, that is, in applying the Model one assesses who needs evaluative information, and for what purpose. There are four levels of program effects which the evaluator can choose to evaluate. The levels are: 1) participant reaction, 2) participant learning, 3) participant transfer of learning, and 4) organizational impact of the program.     

Inquiry Science Learning and Teaching: a Comparison Between the Conceptions and Attitudes of Pre-service Elementary Teachers in Hong Kong and the United States

Research in Science Education - International studies of science education, such as the Trends in Mathematics and Science Study (TIMSS), have revealed considerable national disparities in...