Influence of Process Parameters on Chlorinated Biocide Decontamination by li-CO2 on Artificially Contaminated Model Materials     

Tiziana Lombardo  Marie Wörle  Vera Hubert  Erwin Hildbrand  Christina Hinterleitner  Ingo Mayer 《文物保护研究》2020,65(2):65-76

ABSTRACT

Previously, heavy use of biocides for the treatment of objects made of organic materials in museum collections (e.g. ethnographic, historical collections) was very common. Now suitable decontamination methods/technologies are being sought. A decontamination treatment by li-CO₂ was optimized that considered the specific requirements of museum objects. The treatment was tested on model materials artificially contaminated with biocide solutions containing dichlorodiphenyltrichloroethane (DDT), pentachlorophenol (PCP), lindane, and permethrin or cypermethrin. High decontamination was achieved for DDT, lindane, PCP, and permethrin on artificially biocide loaded wool and wood model materials. Optimal process parameter settings for li-CO₂ decontamination include a single 30?min cycle for woolen materials and three sequential 30?min cycles each for wood. These methods allow a reduction of at least 90% of all biocides for wool and between 70% and 85% for wood. Decontamination of the latter was more effective for less polar biocides as DDT and permethrin. Despite a significant improvement in decontamination for wood using co-solvents such as acetone, ethanol, and methyl tertiary-butyl ether (MTBE), their use is not recommended due to the increased risk of damage to the objects, in particular if a surface coating is present.  相似文献   

Preschool writing and premathematics predict Grade 3 achievement for low-income,ethnically diverse children     

Louis Manfra  Christina Squires  Laura H. B. Dinehart  Charles Bleiker  Suzanne C. Hartman  Adam Winsler 《The Journal of educational research》2017,110(5):528-537

The present study was designed to explore the association between preschool academic skills and Grade 3 achievement among a sample of ethnically diverse children from low-income families. Data were collected from a sample of 1,442 low-income, ethnically diverse children in preschool and associated with Grade 3 achievement in reading and mathematics 4 years later. Mixed-effects modeling indicated that preschool skills significantly predicted Grade 3 achievement measures while controlling for various child-level factors and random school effects. While several preschool factors were predictive of Grade 3 achievement, writing/copying and counting/premathematics skills were consistently strong predictors of Grade 3 achievement across all measures and domains suggesting these are important foundational skills for academic success in midelementary school among low-income, ethnically diverse children. Findings also replicate studies demonstrating that writing plays an important role in learning and achievement. Findings have implications for early education policy and practice intended to support academic development among low-income, ethnically diverse children.  相似文献   

Ahead of the pack? Explaining the unequal distribution of scholarships in Germany     

Christina Haas  Herman Van De Werfhorst 《British Journal of Sociology of Education》2017,38(5):705-720

This article investigates to what extent scholarships are unequally distributed among students in Germany and how these inequalities can be explained. Following sociological theory, the article argues that elites seek qualitative ways of distinguishing themselves in a mass higher education system. Using student surveys, we demonstrate that class effects cannot merely be explained with reference to class differences in academic achievement but that higher classes have better access to scholarships independent of earlier school performance. Class differences were particularly persistent when the intermediate classes were compared with higher classes with more education. These findings illustrate that social classes have different strategies when it comes to participating in higher education and suggest that information about and access to scholarships is important in gaining a class advantage.  相似文献   

Propagation from the start: the spread of a concept-based instructional tool     

Debra M. Friedrichsen  Christina Smith  Milo D. Koretsky 《Educational technology research and development : ETR & D》2017,65(1):177-202

We describe the propagation of a technology-based educational innovation through its first 3 years of public use. The innovation studied is the Concept Warehouse (CW), a database-driven website developed to support the use of concept-based pedagogies. This tool was initially developed for instructors in undergraduate chemical engineering courses, but has spread to other disciplines as well. In this time, it has grown to over 650 registered instructors representing over 170 institutions. While this study is specific to a particular case, the intent of this article is to provide an exemplar of real-time propagation that informs other researchers and developers. We frame our analysis with Diffusion of Innovation Theory and use a design research methodology that focuses on communication channels, types of knowledge, and stages of the innovation-decision process. Data sources include usage records and survey responses which are analyzed with network diagrams and non-parametric statistics. We find that in comparison to mass media, interpersonal communications tended to result in higher proportions of how-to knowledge and implementation. Three types of opinion leaders were identified through user data and network diagrams. All played critical roles in the tool’s propagation, especially the project collaborators—opinion leaders who actively promoted the CW, in part, because it also propagates their own innovations. Finally, users with self-identified prior principles knowledge showed statistically significantly greater progress in gaining how-to knowledge, but no significant difference in progressing to the implementation stage of the innovation-decision process when compared to users without.  相似文献   

Scaling and Sustaining Effective Early Childhood Programs Through School–Family–University Collaboration          下载免费PDF全文

Arthur J. Reynolds  Momoko Hayakawa  Suh‐Ruu Ou  Christina F. Mondi  Michelle M. Englund  Allyson J. Candee  Nicole E. Smerillo 《Child development》2017,88(5):1453-1465

We describe the development, implementation, and evaluation of a comprehensive preschool to third grade prevention program for the goals of sustaining services at a large scale. The Midwest Child–Parent Center (CPC) Expansion is a multilevel collaborative school reform model designed to improve school achievement and parental involvement from ages 3 to 9. By increasing the dosage, coordination, and comprehensiveness of services, the program is expected to enhance the transition to school and promote more enduring effects on well‐being in multiple domains. We review and evaluate evidence from two longitudinal studies (Midwest CPC, 2012 to present; Chicago Longitudinal Study, 1983 to present) and four implementation examples of how the guiding principles of shared ownership, committed resources, and progress monitoring for improvement can promote effectiveness. The implementation system of partners and further expansion using “Pay for Success” financing shows the feasibility of scaling the program while continuing to improve effectiveness.  相似文献   

How Science Teachers DiALoG Classrooms: Towards a Practical and Responsive Formative Assessment of Oral Argumentation     

Henderson  J. Bryan  Zillmer  Nicole  Holton  April  Weiner  Steven  Greenwald  Eric  Goss  Megan  Lopez  M. Lisette  Morales  Christina  Pearson  P. David  McNeill  Katherine L. 《Journal of Science Education and Technology》2021,30(6):803-815

Journal of Science Education and Technology - We present lessons learned from an ongoing attempt to conceptualize, develop, and refine a way for teachers to gather formative assessment evidence...  相似文献   

Multimodal Interaction Analysis: a Powerful Tool for Examining Plurilingual Students’ Engagement in Science Practices     

Wilmes  Sara E. D.  Siry  Christina 《Research in Science Education》2021,51(1):71-91

Research in Science Education - Science teaching and learning are discursive practices, yet analysis of these practices has frequently been grounded in theorizations that place language at the...  相似文献   

Tales from three countries: reflections during COVID-19 for mathematical education in the future     

Krause  Christina M.  Di Martino  Pietro  Moschkovich  Judit N. 《Educational Studies in Mathematics》2021,108(1-2):87-104

How can school mathematics prepare citizens for a democratic society? Answers to this question are not static; they change as society and its problems change. The SARS-CoV-2 pandemic with its corresponding disease COVID-19 presents such a problem: what is needed to navigate this complex situation that involves, among other things, mathematics? Using the essay genre, we use three narratives from three countries—Italy, the USA (California), and Germany—to reflect on the goals of teaching mathematics during this crisis and examine aspects of each country’s standards for mathematics education. These three stories are framed by the authors’ backgrounds, experiences, interests, their country’s situation, and response to the pandemic. We first present the three narratives and then examine common issues across them that might provide insights beyond this current crisis, for preparing students to become active citizens. In particular, we focus on three issues: (1) developing a positive mindset toward mathematics to engage with and reflect on real-world problems, (2) improving interdisciplinary connections to the sciences to better understand how science professional practices and insights are similar or different from everyday practices, and (3) considering interpersonal and collective matters beyond the individual.

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The effect of worked examples on student learning and error anticipation in algebra     

Barbieri  Christina Areizaga  Booth  Julie L.  Begolli  Kreshnik N.  McCann  Nicholas 《Instructional Science》2021,49(4):419-439

Instructional Science - The present study examines the effectiveness of incorporating worked examples with prompts for self-explanation into a middle school math textbook. Algebra 1 students...  相似文献   

The future of higher education in Ireland: a postcolonial perspective     

Christina Burke 《Journal of Higher Education Policy & Management》2018,40(5):458-469

The transformation that Irish higher education (HE) has undergone since the mid-2000s has been particularly rapid and unidirectional. Following the Global Financial Crisis, the Irish Government sought to take control of tertiary education in an attempt to shield the country from future economic shocks. This paper succinctly discusses the circumstances leading to the current policy position and what these changes have meant for Irish HE. A postulation that neoliberalism will inevitably deepen further within Irish HE will be explored through the lens of Postcolonial theory. In conclusion, I will show that the application of this theoretical stance may succeed in buffering many of the effects of neoliberalism to ensure ample space in HE for all subject areas and disciplines.  相似文献