Halite – A new calibration material for microdrilling resistance measurements     

Marisa Pamplona  Mathias Kocher  Rolf Snethlage 《Journal of Cultural Heritage》2010,11(2):180-184

This paper aims at proposing a new calibration material for microdrilling resistance measurements. Microdrilling resistance is a microdestructive method mainly used in built heritage in order to determine the strength profile in depth. This method is suitable to detect changes in the material cohesion, either due to a different state of preservation or to the action of a consolidant. Calibration materials are often used in microdrilling measurements in order to characterise the drill bit initial value and to correct the variations existing within the initial values of a set of drill bits. Calibration materials are also useful to detect the wear effect on a drill bit due to an abrasive stone. Moreover, such materials can be used for comparing results obtained with different microdrilling machines. In this work, halite was chosen to be tested as a calibration material due to its properties, as low hardness and isotropy. Halite single crystals and halite salt stone from different provenances were tested in order to evaluate the suitability of this material to the requests of a calibration material for microdrilling resistance applications, as for instance being homogeneous, non-abrasive, sensitive and available worldwide. Experimental results show that halite from different provenances is very homogeneous, especially in the crystalline form. This form of halite is slightly more expensive than stone halite; however its costs are comparable to ARS and significantly lower than Macor (other calibration materials commonly used for microdrilling resistance measurements). Due to the advantages of halite for calibration purposes, this material should be further tested by other authors in order to validate our conclusions.  相似文献   

Do Parents Foster Self‐Esteem? Testing the Prospective Impact of Parent Closeness on Adolescent Self‐Esteem          下载免费PDF全文

Michelle A. Harris  Andrea E. Gruenenfelder‐Steiger  Emilio Ferrer  M. Brent Donnellan  Mathias Allemand  Helmut Fend  Rand D. Conger  Kali H. Trzesniewski 《Child development》2015,86(4):995-1013

Close parent–child relationships are viewed as important for the development of global self‐esteem. Cross‐sectional research supports this hypothesis, but longitudinal studies provide inconsistent prospective effects. The current study uses data from Germany (N = 982) and the United States (N = 451) to test longitudinal relations between parent–child closeness and adolescent self‐esteem. The authors used self‐, parent‐, and observer‐reported parent–child closeness and self‐reported self‐esteem from ages 12 to 16. Results replicated concurrent correlations found in the literature, but six longitudinal models failed to show prospective relations. Thus, the longitudinal effect of parent–child closeness and self‐esteem is difficult to detect with adolescent samples. These findings suggest the need for additional theorizing about influences on adolescent self‐esteem development and longitudinal research with younger samples.  相似文献   

KILLER AND VICTIM ISSUES: ISSUE COMPETITION IN THE AGENDA-SETTING PROCESS OF GERMAN TELEVISION     

Hans-Bernd  Brosius; Mathias Hans  Kepplinger 《Int. Journal of Public Opinion Research》1995,7(3):211-231

The capacity of the mass media to cover issues as well as thecapacity of recipients to be concerned about issues is limited.The coverage on and the concern about new issues will consequentlyremove old issues from the agenda of both the mass media andthe general public. The present study investigates two modelsof this process of issue competition. The equal-displacementmodel assumes that a rise of one issue in the media by a givennumber of stories is matched by an equal fall in all other issuessumming up to a similar number of issues. The restructuringmodel assumes that unexpected, surprising or otherwise newsworthyevents create killer issues that move several other issues completelyoff the agenda and leave others untouched. A content analysisof all news shows of the two major TV stations in Germany and53 weekly surveys regarding 16 different issues covering thewhole year 1986 shows that—within the media agenda—therewere no killer issues affecting the coverage of the TV stations.In the public agenda, however, some killer issues could be identified.Coverage of these issues increased public concern about themand decreased concerns about other issues. Consequences of theseresults for agenda-setting theory and for politics are discussed.  相似文献   

OPINION FORMATION IN MEDIATED CONFLICTS AND CRISES: A THEORY OF COGNITIVE-AFFECTIVE MEDIA EFFECTS   总被引：1，自引：0，他引：1  

Kepplinger  Hans Mathias; Brosius  Hans-Bernd; Staab  Joachim Friedrich 《Int. Journal of Public Opinion Research》1991,3(2):132-156

This paper analyzes opinion formation in the cases of threemediated conflicts using a complex model that evaluates therespondents' value systems, the coverage of the mass media used,the recipients' familiarity with specific events occurring inthe conflicts, and their positions on the issues. The modelpredicts that the recipients' long-term value systems influencetheir positions on the issue in two ways. Firstly, value systemshave a direct impact on the short-term positions on an issue.Secondly, value systems have an indirect impact on the positionsof issues by influencing the recipients' selection of news mediaand thus the type and amount of news information they are exposedto. The type and amount of news influences how knowledgeablethey are of the events related to the conflicts. The familiaritywith these events influences their positions on the issues.Value systems, media usage, familiarity and positions on theissues were measured in a survey. A parallel content analysisexamined the coverage of the conflicts in the German mass media(press, radio, television) during the six-month time frame priorto the survey. Both data sets were merged in order to give anestimate of the information each recipient was exposed to. Theresults of multiple regression analyses support the theoreticalmodel. Furthermore, this paper discusses the relevance of themodel for the analysis of opinion formation as well as the limitationsof the model.  相似文献   

Science students' approaches to learning   总被引：1，自引：1，他引：1  

Haydn S. Mathias 《Higher Education》1980,9(1):39-51

A small group of science students were closely followed through their under-graduate course. The problems and issues which arose as they came to terms with university are described. The notions of course-focussed and interest-focussed behaviour are introduced as ways of characterising the degree of independence the student demonstrated in relation to his learning objectives. These notions are discussed and further employed to indicate various attitudes and approaches to study which students adaptively developed in relation to their university work.Formerly of the Centre for Educational Technology, University of Sussex.  相似文献   

The National Library for the Handicapped Child     

Beverley Mathias 《Children‘s Literature in Education》1988,19(4):222-229

Beverley Mathias is one of the trustees of the Sidney Robbins Trust, set up in memory of the founder ofChildren's Literature in Education. Since 1985 she has been Director of The National Library for the Handicapped Child in the U.K. The Editors invited her to describe the work of this important institution in the field of learning to read.Beverley Mathias worked as a librarian in Australia, where she was also associated with Court and Joyce Oldmeadow, winners of the Eleanor Farjeon Award, specialising in children's books. From 1979 to 1985, Ms. Mathias was Children's Books Officer for the National Book League (now the Book Trust) in London. She has published two poetry compilations for children and a new series of books for deaf and hearing children.  相似文献   

Twelve- and Fourteen-Year-Old School Children Differentially Benefit from Sensorimotor- and Multisensory-Enriched Vocabulary Training     

Mathias  Brian  Andrä  Christian  Schwager  Anika  Macedonia  Manuela  von Kriegstein  Katharina 《Educational Psychology Review》2022,34(3):1739-1770

Educational Psychology Review - Both children and adults have been shown to benefit from the integration of multisensory and sensorimotor enrichment into pedagogy. For example, integrating pictures...  相似文献   

Schools in the making: mapping digital spaces of evidence     

Mathias Decuypere  Carlijne Ceulemans  Maarten Simons 《教育政策杂志》2014,29(5):617-639

In this article, the focus is on educational governing in the making. Drawing on conceptual underpinnings of socio-technical approaches, this implies an interest both on the way in which a sound knowledge base for policy measures is created, as on the distribution of that knowledge through publically available instruments. Governing by evidence only is possible when it relies on concrete instruments, such as feedback reports, publically consultable audits and examples of good practice. Since knowledge-related practices increasingly make use of online tools where knowledge is accessible for each and all, three websites are analysed in a particular way to describe the making of evidence. First, considered as active devices, the websites are analysed as essential components of the governing by evidence: by publishing specific data and information in a particular way, they come to constitute what comes to count as evidence and the way in which it comes to count. By addressing their visitors in a particular way, moreover, they constitute for whom it comes to count as evidence. As such, we argue, it becomes visible that digital spaces of evidence actually make schools real, and, at once, that there are different modes for schools to exist.  相似文献   

Strategies for change in higher education: Three political models     

Desmond Rutherford  William Fleming  Haydn Mathias 《Higher Education》1985,14(4):433-445

This article describes three models which give insight into the factors that promote or inhibit change in institutions of higher education: a structural model; a social model; and a personal model. Although each offers a distinctive perspective, a number of recurrent themes are identified where the models support and complement one another. The usefulness of the three models in practice is illustrated by analysing how they might help in a possible innovation - the rapid expansion of Continuing Education in a traditional university.This is a revised and extended version of a paper presented at the Sixth International Conference on Higher Education, University of Lancaster, August 28–31, 1984.  相似文献   

Course evaluation at Birmingham: Some implications for the assessment and improvement of university teaching     

Haydn Mathias  Desmond Rutherford 《Studies in Educational Evaluation》1981,7(3):263-266

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