Fluorescence and photodegradation of Xuan paper: The photostability of traditional Chinese handmade paper

Xuan paper is a type of Chinese handmade paper produced for traditional calligraphy and painting in China since the Tang Dynasty (618–907 AD), and is therefore an important cultural heritage material. In this study, the fluorescence and photochemical properties of Xuan paper were investigated. Xuan paper exhibits auto-fluorescence in the blue spectral range (450–500 nm) and UVA photolysis of the paper resulted in a substantial reduction in the blue fluorescence together with the formation of chromophores absorbing in the visible spectrum, resulting in photoyellowing of the paper. A more significant yellowing of paper was observed when irradiated in the dry state than under wet conditions. The associated photogeneration of hydrogen peroxide and superoxide from three types of Xuan paper samples during irradiation showed a correlation between the yields of reactive oxygen species and their relative yellowing rates. The results are interpreted in terms of sensitised photooxidation via a mechanism of electron transfer involving the fluorophores in their excited singlet states being responsible for the photodegradation of Xuan paper. SEM/EDS analyses were performed on the Xuan paper samples to investigate their morphological and elemental characteristics. Silica-containing fibres characteristic of a special rice straw that grows in siliceous soil were observed in all types of Xuan paper. Micron-sized calcium precipitates possibly formed from the “lime-steaming” manufacture process were shown to protect against the acidification of paper during accelerated thermal ageing.     

Classroom Questioning with Immediate Electronic Response: Do Clickers Improve Learning?

A number of studies have focused on how students and instructors feel about digital learning technologies. This research is focused on the substantive difference in learning outcomes between traditional classrooms and classrooms using clickers. A randomized block experimental design involving four sections of undergraduate Operations Management classes was used to determine if clicker systems increase student learning of both quantitative and conceptual material in Operations Management. Learning was measured using the difference between the scores on an entrance examination and the final examination. The findings of this research provide evidence that the use of immediate feedback using a technology like clickers can have a positive impact on student learning as measured by test scores.     

Learners and learning contexts: international perspectives on new alignments for the digital age

Educational technology research and development - Twelve papers representing 59 authors from 16 different nations are included in this special issue addressing the theme of ‘Learners and...     

Autonomy and control: a university funding formula as an instrument of public policy

Formulas are used in many jurisdictions to allocate public funds among universities which may then have considerable autonomy in the internal allocation of those funds. This paper provides first an overview of formula funding as it affects university education. This is followed by an exposition on the balance between autonomy and accountability in the Province of Ontario. Formula funding in Ontario is used as a case study to evaluate how effective formula-funding has been in encouraging autonomous universities to work towards the attainment of public policy objectives. The analysis shows that four mechanisms have in fact been used - namely formula funding, designated extraformula grants, incentive funding, and controls - and that some objectives are better supported by different mechanisms. The paper concludes with a discussion of the evolution and an evaluation of formula funding in Ontario against the objectives given for its introduction.     

The Civil Rights Commission Must Persist

Columnist George Will and others have questioned the continuing need for a federal civil rights commission, because civil rights protections have been on the books since 1964. The chairman of the Commission, Gerald Reynolds, here responds that practitioners of critical legal theory, advocates of the Akaka-Secession bill, some proponents of diversity, and others like them may make the continued existence of his commission a necessity.     

In-Service Education of Counseling Supervisors

The literature indicates that little attention has been given to the in-service education of counseling supervisors. This article describes such a program carried out by the New York State Employment Service and the University of Rochester. Three small groups (total N = 25) met periodically during one year. The group leader helped the members deal with practical, existing problems. He also related these to the theoretical concepts presented in prior institutes. Initial evaluation indicated very positive reactions by the supervisors. Discussion points out the utlization of this model for various types of counseling supervisors.