Degradation of collagen in parchment under the influence of heat-induced oxidation: Preliminary study of changes at macroscopic,microscopic, and molecular levels

This paper examines the impact of heat-induced oxidation for new and historical parchment with the purpose of improving diagnostic tools for use in practical parchment conservation. Oxidation was generated by heat aging at 120°C in a dry oven for 24, 48, and 96 hours, respectively. The degradation was assessed on all samples at macrolevel by measuring color changes, at microlevel by measuring the shrinkage temperature as well as by performing a visual assessment of the fibers’ morphology and determining the amount of damaged fibers, and finally, at molecular level where amino acid analysis was used to reveal changes in the oxidized collagen. The study shows that the heat-induced oxidation leads to significant color changes, decrease in hydrothermal stability, as well as changes in the amino acid composition. Surprisingly, the results show that the historical parchment is more sensitive towards dry heat oxidation on a molecular level than is the new parchment. Furthermore, for the first time, we can show that physical damage reflected in the morphological characteristics of fibers can be attributed to oxidation by dry heat.     

Altered surfaces,taking the long view: Applications of ethnographic conservation practices to the conservation of contemporary art

While working together on tradition-based and contemporary works at the Smithsonian's National Museum of African Art (NMAfA) and in private practice, the authors found that their expertise in ethnographic conservation can be applied to the conservation of contemporary works. The treatment approach to ethnographic works has evolved over decades, shifting from alteration of original surfaces and heavy restoration to an emphasis on preserving the original integrity of the artwork through minimal intervention. This paper describes the evolution of ethnographic object conservation regarding surface alteration, while specifically focusing on African objects, and discusses applications of this approach to the conservation of contemporary art. The historical change in treatment attitudes is presented using examples from NMAfA's collections to underscore why the profession developed a minimal intervention approach and to argue for the relevance of this approach to related contemporary media.     

A new national standard for electronic documents

This paper analyzes the recently approved GOST R 7. 095–2015. Electronic Documents. Main Types, Output Information, and Technological Characteristics national standard that considers an electronic document as a component of librarian and archival funds, as well as formulating the signs that permit an electronic object to be attributed to the class of documents. The type of an electronic document determines its functionality, which in turn causes the technological requirements for the material implementation of the document (in particular, the requirements for formats). Due to the specificity of data processing in the electronic environment, an electronic document exists as many equivalent implementations and any work with it, including displaying, is the continuous creation of these implementations. In this regard, the technological operation of copying leads not to creating a document of a new type (a “copy”) but only to the origin of a new implementation that is equivalent to any other. Hence, there is a need for a set of identification characteristics (attributes) for electronic documents.     

The challenges of information retrieval in social sciences and humanities and ways to overcome information barriers

This paper explores the major challenges of access to information that face the consumers of various databases of the Institute of Scientific Information on Social Sciences (INION) of the Russian Academy of Sciences. The key features of different types of information barriers are investigated. The possibilities and means to overcome these barriers are explored in the current context.     

Space Case: Moving from a Physical to a Virtual Journal Collection

Journal publishing has evolved and changed considerably over the years, leaving many libraries to grapple with analyzing and identifying the purpose and scope of these collections. After numerous discussions and an analysis of how the current print journal collection was being used, Kraemer Family Library at the University of Colorado–Colorado Springs decided to withdraw over 50% of the library’s print journal holdings in order to create a collaborative space for students. This article begins with an overview of journal publishing as it relates to academic libraries and the impact of electronic serials on the scope and purpose of a print journal collection. It then highlights the steps used to complete the project, and communication goals and methods employed to keep library staff members, faculty on campus, and other constituents aware of the changes taking place in the library.     

Do field position and playing standard influence athlete performance in wheelchair basketball?

Improved understanding of mobility performance in wheelchair basketball is required to increase game performance. The aim of this study was to quantify the wheelchair-athlete activities of players in different field positions and of different playing standard during wheelchair basketball matches. From video analysis, absolute and relative duration and frequency of wheelchair movements and athlete control options were examined in 27 national standard and 29 international standard players during entire wheelchair basketball matches. Between-group factorial analysis of variances identified that national players drove more forward (42.6 ± 6.8 vs. 35.4 ± 3.7%; effect size Cohen’s d (ES) = 1.48) and started more often driving forward (33.9 ± 2.6 vs. 31.8 ± 2.8; ES = 0.77) during a match while the mean activity duration for a single driving forward activity was longer (4.3 ± 0.9 vs. 3.7 ± 0.6 s; ES = 0.75) than for international players. Furthermore, national players performed fewer rotational movements (21.8 ± 4.0 vs. 28.9 ± 7.8%; ES = –1.30) and started less often with the rotational movements (35.0 ± 3.6 vs. 40.5 ± 5.5; ES = –1.21) while the mean activity duration for a single rotation activity was shorter (2.1 ± 0.3 vs. 2.3 ± 0.3 s; ES = –0.67) than for international players. Differences in mobility performance among guard, forward and centre players were minimal. The results should help wheelchair basketball coaches specify wheelchair-handling training techniques and means to optimise wheelchair-athlete configurations.     

Ethnic, gender, and socio-economic group differences in academic performance and secondary school selection: A longitudinal analysis

This study examined gender, socio-economic (SES), and ethnic group differences in academic performance (measured at 14 and 16 years) in a sample of 517 British pupils (mean age = 16.5 years). White pupils outperformed their Black and Pakistani counterparts and high SES pupils consistently outperformed their low SES counterparts. Results from two Multiple Indicators Multiple Causes (MIMIC) models showed that controlling for IQ variance minimizes these group differences. The MIMIC models also revealed that Pakistani pupils and girls tend to underperform academically relative to White pupils and boys, respectively, at 14 years, once IQ and SES have been partialed out. These and other, more specific, findings are discussed with reference to predictive test bias, selection and streaming procedures, and implications for educational policy.     

Epistemological beliefs and self-regulated learning with hypertext

This study investigated the relationship between epistemological beliefs, prior domain knowledge and self-regulated learning. Biology students (n?=?25) and humanities students (n?=?26) who varied in their epistemological beliefs learned with a hierarchical hypertext about the topic of genetic fingerprinting. During their learning processes, logfiles and questionnaire data were collected. Results indicate that students do metacognitively calibrate their learning process to the complexity of the presented learning material, e.g. by processing more complex deeper-level nodes longer. Furthermore, these calibration processes were significantly related to epistemological beliefs. For example, more ‘sophisticated’ epistemological beliefs were associated with processing more nodes, whereas more ‘naïve’ beliefs were related to spending more time on single nodes. Both effects were especially pronounced on deeper hierarchical hypertext levels. Prior domain knowledge also had an impact, especially on comprehensibility ratings: biology students considered all nodes more comprehensible than humanities students. Additionally, epistemological beliefs as well as prior domain knowledge were also significantly associated with the learning outcome: for example, more prior domain knowledge led to significantly higher learning outcome.