A cause of water-sensitivity in modern oil paint films: The formation of magnesium sulphate

Unvarnished twentieth-century oil paintings are often sensitive to aqueous swabbing, a method routinely employed by conservators for surface cleaning. This study proposes a connection between sensitivity and the presence of magnesium sulphate heptahydrate which has been identified on the surface of some of water-sensitive paintings. The probable source of magnesium is magnesium carbonate, an additive in some twentieth-century oil paints, which has reacted with atmospheric sulphur dioxide (SO₂). Films made using modern manufactured paints and formulations made in the laboratory were exposed to gaseous SO₂ and raised relative humidity and examined using scanning electron microscopy with energy dispersive X-ray spectroscopy and X-ray diffraction to characterize the crystalline entities. Films containing magnesium carbonate formed magnesium sulphite and sulphate hydrates. Films containing zinc oxide were also investigated. These formed zinc and sulphur containing salts. Sensitivity to swabbing with water before and after exposure was evaluated. Films that developed salts, demonstrated increased sensitivity to aqueous swabbing after exposure to SO₂. Findings suggest that increased water sensitivity may be due to a combination of the formation of hygroscopic degradation products and to weakening of the paint film due to salt-induced disruption of the surface.     

Use of Lecture Capture in Higher Education - Lessons from the Trenches

Lecture capture, defined here as the capturing of some or all elements of a live lecture in digital format, is becoming increasingly popular in higher education. Despite this increase in popularity, fewer than 10% of institutes of higher education globally have adopted comprehensive lecture capture systems. So, the majority of instructors wanting to use lecture capture technology will find themselves having to acquire their own technology and do the capture themselves. There are several factors that influence the use of lecture capture, including the instructor’s level of comfort with technology, their budget, and the context in which they will be using the tool. Using case studies of our own experiences, we hope to illustrate a variety of ways in which lecture capture can be appropriately used in higher education in this way. Following this, we outline several challenges that we faced and provide recommendations for how to overcome these. Lastly, we describe some issues that should be considered and addressed before getting started using lecture capture technology in a way that is customized to suit the needs of both professor and student. We hope that by following the guidelines outlined in this paper, and by seeing practical examples of how lecture capture can be used in a variety of contexts, the transition from idea to implementation will be an easier one.     

Poor Auditory Task Scores in Children With Specific Reading and Language Difficulties: Some Poor Scores Are More Equal Than Others

Children with specific reading disability (SRD) or specific language impairment (SLI), who scored poorly on an auditory discrimination task, did up to 140 runs on the failed task. Forty-one percent of the children produced widely fluctuating scores that did not improve across runs (untrainable errant performance), 23% produced widely fluctuating scores in early runs that did improve across runs (trainable errant performance), 26% produced stable poor scores that did not improve across runs (untrainable nonerrant poor performance), and 23% produced stable poor scores that did improve across runs (trainable nonerrant performance). In most cases, trainable and untrainable errant performance, and nonerrant poor performance, could be predicted from a child's first two auditory task scores. These results illustrate that poor auditory task scores produced by children with SRD and SLI do not reflect a unitary deficit, do not necessarily reflect poor perception, and do not always respond to training.     

Referees' use of heuristics: The moderating impact of standard of competition

Abstract

The influence of players' standard of competition on referees' decision making was investigated. Standard of competition was examined by studying 30 handball matches, 15 at League and 15 at National standard. At both standards, we examined two types of refereeing decision (sporting and disciplinary) after transgressions that varied in ambiguity. The results indicated that referees made more lenient decisions at higher standards of competition, but this tendency depended on the type of decision being made and ambiguity in the offence. The hypothesis that referees use standard of competition as a judgemental heuristic, but in varying ways, was supported.     

Perspectives of elders in thriving marriages on why their marriages thrive

Lengthy lifespans prompt research on how aging adults thrive in their marriages. This qualitative research study explored the perspectives of 14 elder couples nominated as thriving in their marriages. The 28 participants, living in the United States, ranged in age from 70 to 89. Twelve couples were in first marriages that ranged from 43–67 years. Two couples were in second marriages for 27 and 29 years. The participant group was diverse in race, ethnicity, religion, and birthplace but not in socio-economic-status and formal education level. Together the two researchers, also over 70, conducted two interviews with each couple, also together, in the two-year study. The in-depth, semi-structured interviews were the major source of data; secondary sources were a values-ranking inventory, a self-anchoring scale activity, an exercise on findings from other studies, and two small focus group discussions. The findings were: a) thriving couples experienced significant and pervasive in-depth love, b) shared extensive commonalities, c) teamed mutually, d) solved problems and confronted challenges well, d) welcomed caring gestures and expressions of appreciation, and e) valued physical affection and sexual intimacy. The insights and advice shared could benefit not only married elder couples, but also single elders in their social relationships, couples considering marriage, and those who work with elders in hospitals, healthcare facilities, and counseling services.