Pollution monitoring by dosimetry and passive diffusion sampling for evaluation of environmental conditions for paintings in microclimate frames

Pollutants and their potential degradation of paintings have been measured for the first time in microclimate frames (mc-frames), which are used to protect paintings. The pollutants that were measured include both inorganic pollutants, which originate mainly from external sources, and organic pollutants from mainly internal sources. Those originating from the outdoors enter rooms and subsequently mc-frames at a rate depending on the ventilation rates (air exchange rates) of the mc-frames. The concentration of gaseous pollutants emitted within the mc-frames will depend on net emission rates of the materials used to make the mc-frames, their design, and their ventilation rates. In the EU PROPAINT project measurements of gaseous air pollutants and climatic conditions were performed at various locations both inside and outside different state-of-the-art mc-frames. Diffusive passive pollution gas samplers were used together with different types of dosimeters. Results show that the dosimeters respond to either the photo-oxidizing conditions or the level of volatile organic acids in the environments both in the museums and within the mc-frames. Two dosimeters, the Early Warning Organic (EWO) made from a synthetic polymer and the Resin Mastic coated Piezo electric Quartz Crystals (RM-PQC) respond to photo-oxidation and showed higher values outside than inside the mc-frames. Two other dosimeters, the Glass Slide Dosimeter (GSD) and the Lead coated Piezo electric Quartz Crystals (L-PQC) respond to volatile organic acids and yielded higher values inside than outside the mc-frames. This study emphasizes the need for further work to determine environmental damage functions for paintings, in particular for the effects of organic acids. Such information is essential for the evaluation of the protective effects of mc-frames for paintings. The use of mc-frames is increasing and it is very important to know that this protective measure does not introduce new risks.     

Iterative learning control for fractional-order multi-agent systems

In this paper, we apply iterative learning control to both linear and nonlinear fractional-order multi-agent systems to solve consensus tacking problem. Both fixed and iteration-varying communicating graphs are addressed in this paper. For linear systems, a PD^α-type update law with initial state learning mechanism is introduced by virtue of the memory property of fractional-order derivative. For nonlinear systems, a D^α-type update law with forgetting factor and initial state learning is designed. Sufficient conditions for both linear and nonlinear systems are established to guarantee all agents achieving the asymptotic output consensus. Simulation examples are provided to verify the proposed schemes.     

From preschool teachers’ professional development to children’s knowledge: comparing sets

Recently, there have been increased calls for enhancing preschool children’s mathematics knowledge along with increasing calls for preparing preschool teachers to meet the demands of new preschool mathematics curricula. This article describes the professional development program Starting Right: Mathematics in Preschools. Focusing on four episodes that revolve around the topic of equivalent sets, it demonstrates how engaging preschool teachers with challenging tasks may promote their subject matter knowledge as well as their pedagogical content knowledge, leading to an interweaving of knowledge and practice. Assessment of the program included assessing the children’s knowledge. Results indicated that students of participating teachers learned to be more flexible and to give more possible answers than students of non-participating teachers.     

Do siblings influence one another? Unpacking processes that occur during sibling conflict

This study examined the extent to which 205 sibling dyads influenced each other during conflict. Data were collected between 2013 to 2015. The sample included 5.9% Black, 15.1% South Asian, 15.1% East Asian, and 63.8% White children. Older siblings were between 7–13 years old (Female = 109) and younger siblings were 5–9 years old (Female = 99). Siblings' conflict resolution was analyzed using dynamic structural equation modeling. Modeling fluctuations in moment-to-moment data (20-s intervals) allowed for a close approximation of causal influence. Older and younger siblings were found to influence one another. Younger sisters were more constructive than younger brothers, especially in sister–sister dyads. Sibling age gap predicted inertia in older siblings. Socialization processes within sibling relationships are discussed.     

Capacity and Flexibility in Community College CTE Programs: Program Offerings and Student Success

Research in Higher Education - This article asks whether small changes to community college courses and programs can help improve student outcomes. We use administrative data from the California...     

School bullying and students’ sense of safety in school: the moderating role of school climate

European Journal of Psychology of Education - One of the negative consequences of bullying in schools is its adverse effect on students’ sense of safety. Previous studies yielded mixed...     

Nursing students' experiences and perceptions of an anatomy laboratory session: Mixed methods study

Many nursing curricula do not offer anatomy laboratories and exposure to cadaveric material. In this mixed methods study, nursing students' perceptions and experiences from an anatomy laboratory session were examined. Students from two academic nursing programs (a four-year general baccalaureate nursing program and a two-year accelerated nursing program for non-nursing baccalaureate graduates) took part in an anatomy laboratory session (N = 223). Participants' learning experiences, emotional experiences, and satisfaction with the anatomy laboratory session were assessed by their responses to closed-ended questionnaires. Participants' reasons for participation and suggestions for improvement were examined by open-ended questions. A mixed methods analysis of the data revealed a high level of satisfaction with the anatomy laboratory experience. Positive attitudes and learning experiences correlated with a sense of identification with the nursing profession. Satisfaction was positively associated with a perceived quality of learning and negatively associated with a negative emotional experience. Curiosity and self-challenge, as well as the quest for tangible, in-depth learning, were major motivators involved in the students' desire to participate in the session. Both qualitative and quantitative analyses indicated that the educational experience was significant. Therefore, it is recommended to integrate anatomy laboratory sessions into anatomy courses for nursing students. This will help to illustrate and assimilate classroom material and strengthen nursing students' sense of identification with their profession.     

A tangible landscape modeling system for geography education

Education and Information Technologies - Geography education requires a combination of knowledge, skills, and geospatial relational thinking. To improve the learning efficiency and durability of...     

Developing preschool teachers’ knowledge of students’ number conceptions

This article describes a study that investigates preschool teachers’ knowledge of their young students’ number conceptions and the teachers’ related self-efficacy beliefs. It also presents and illustrates elements of a professional development program designed explicitly to promote this knowledge among preschool teachers. Results indicated that teachers’ knowledge of students’ number conceptions improved and that their related self-efficacy increased. Furthermore, prior to participating in the programs, a significant negative correlation between knowledge and self-efficacy was reported. However, no significant correlation was found after the program.