Mineralogical-chemical Alteration and Origin of Ignimbritic Stones Used in the Old Cathedral of Nostra Signora di Castro (Sardinia,Italy)     

Stefano Columbu  Anna Gioncada  Marco Lezzerini  Fabio Sitzia 《文物保护研究》2013,58(7):397-422

ABSTRACT

The pyroclastic rocks belonging to the Late Eocene-Miocene volcanic activity that occurred in Sardinia between 38 and 15 Ma ago were widely used as construction materials in several Romanesque churches of the easternmost Logudoro area, as well as in large parts of the Sardinia territory. In this work, the ancient Cathedral of Nostra Signora di Castro (twelfth century) was taken as a representative case study. There is no historical or archaeological evidence of ancient quarries. Based on the geochemical, petrographic, and volcanological data on several samples from an extensive field area (approximately 150?km²), a geographical zoning of the volcanics has been recognised. In the Oschiri sector, there are three different sub-zones, which can be identified with different volcanic rocks: less fractionated rocks (Differentation Index ～70–78); intermediately fractionated rocks (D.I. ～76–79); and more fractionated rocks (D.I. ～77–82). To identify the origin of the ignimbrite rocks of the Church of Nostra Signora di Castro, two statistical methods were used: stepwise linear discriminant and canonical analysis. Moreover, to define the geochemical transformation processes induced by the alteration, a comparative study of concentrations of major and trace elements measured by XRF and SEM-EDX analyses on the surface portion and the innermost areas of the stone was made.  相似文献   

Use of education as social indicator in the assessment of sustainability throughout the life cycle of a building     

Marco A. Ruano  Marcos García Cruzado 《European Journal of Engineering Education》2012,37(4):416-425

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Editorial     

Marco Todeschini 《欧洲师范教育杂志》1993,16(3):193-194

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Refining success and dropout in massive open online courses based on the intention–behavior gap     

Maartje A. Henderikx  Karel Kreijns  Marco Kalz 《Distance Education》2017,38(3):353-368

In this paper we present an alternative typology for determining success and dropout in massive open online courses (MOOCs). This typology takes the perspectives of MOOC-takers into account and is based on the their intentions and subsequent behaviour. An explorative study using two MOOCs was carried out to test the applicability of the typology. Following the traditional approach based on course completion to identify educational success, success rates were 6.5 and 5.6%. The success rates from the perspectives of the MOOC-taker were 59 and 70%. These findings demonstrate that merely looking at course completion as a measure for success does not suffice in the context of MOOCs. This change in addressing MOOC success and dropout provides an alternative view and demonstrates the importance of MOOC-takers’ perspectives.  相似文献   

Analysis of the intraseasonal stability of field test performances in young academy soccer players     

Fabio Massimo Francioni  António José Figueiredo  Marco Terribili  Antonio Tessitore 《Journal of sports sciences》2016,34(10):966-972

This study aimed to observe the intraseasonal stability of anthropometric, technical and functional test results in academy soccer players of different age categories. In total, 103 participants (age range: 7.7–13.4 years) by 5 age categories of the same academy were recruited for this study. Players were submitted to a field-test battery comprising 3 anthropometric measurements (body mass, stature and body mass index), 6 soccer technical tests (to assess the ability of ball control, ball control with the head, pass accuracy, shooting accuracy, dribbling and dribbling with pass) and 3 functional tests (countermovement jump with the hands on the hip, countermovement jump with free hands and 15-m linear sprint) that was administered in 4 test sessions during the same season. Though anthropometric results showed a clear increment in each age category across the season, the fluctuation of technical test results depended on age category and test session. Moreover, a significant increase in the results of functional tests was observed in most of the age categories, in particular, for the assessment of lower power limb. In conclusion, collecting repeated intraseason measurements permits the identification of players’ fluctuations of performance across the season and allows coaches to make frequent adjustments of their programmes.  相似文献   

Quantification of energy expenditure of recreational football     

Marco Beato  Franco M. Impellizzeri  Giuseppe Coratella  Federico Schena 《Journal of sports sciences》2016,34(24):2185-2188

ABSTRACT

There is a strong relationship between low physical activity level and cardiovascular diseases (CVD). The popularity of football may be used to promote physical activity and previous evidence has shown it is effective to decrease the risk of CVD. However, the energy expenditure (EE) of recreational football is not well known but it is crucial to develop preventive health programmes.

Fifteen sedentary middle-aged male participants were involved (mean ± SDs; age 43.9 ± 3.1 years, weight 83.0 ± 13.6 kg, height 174.9 ± 6.8 cm). EE was estimated from the heart rate (HR)-VO₂ relation during 1-h 5-a-side matches (futsal). Participants covered 3412 ± 381 m in 52 ± 2 min, at an average HR of 85 ± 2% of maximum HR. Estimated EE during a recreational futsal match was 634 ± 92 kcal. One futsal recreational match corresponds to about 50% of American College of Sport Medicine recommended physical activity quantity per week. Based on this estimation: once, twice and 3 sessions per week are equivalent to 50% (634 kcal), 100% (1268 kcal) and 150% (1902 kcal), respectively, of EE suggested in international guidelines. This EE estimation may have important implications for designing recreational football training protocols in health programmes and dose response studies.  相似文献   

Demographics of scholarly publishing and communication professionals          下载免费PDF全文

Albert N. Greco  Robert M. Wharton  Amy Brand 《Learned Publishing》2016,29(2):97-101

Scholarly publishing plays a pivotal role in the dissemination of research. While a great deal is known about the companies active in this sector, we need to know more about the employees of the firms that edit, produce, market, and distribute today's scholarly books and journals. To achieve this goal, the researchers conducted an international survey in late 2014 and early 2015 of approximately 6,121 scholarly publishing employees in 33 nations. The researchers received 828 usable questionnaires. Some of the substantive findings about the respondents include: 90.79% identified themselves as white; 85.07% worked in scholarly publishing for more than 5 years; 60% held graduate or professional degrees; and 49% worked in editorial departments. Key suggestions include the need for annual surveys of this type and that the majority of scholarly publishing firms need to address the issue of diversity.  相似文献   

Book Publishers Should Support Changes in the Office of the Copyright and the Register of the Copyright Office     

Albert N. Greco 《Publishing Research Quarterly》2017,33(2):117-125

The U.S. Copyright Office and the Register of Copyrights supervise a myriad of major functions, from recording a copyright to providing the U.S. Congress with reports and suggestions regarding the state of the law. Yet this office is part of the Library of Congress, which controls its budget and appoints the Register. Should the book publishing community support the creation of an Office of Copyrights as a separate agency of the U.S. Government? What can or should the book publishing community do to address these issues and questions? This article explores the development of the Copyright Office, the Register of Copyrights, and provides some suggestions and recommendations.  相似文献   

The Kirtsaeng and SCI-HUB Cases: The Major U.S. Copyright Cases in the Twenty-First Century     

Albert N. Greco 《Publishing Research Quarterly》2017,33(3):238-253

There has been a plethora of substantive copyright cases in the history of the United States. Two of the most important cases in the last few years were: the Kirtsaeng case before the Supreme Court of the United States; and the SCI-HUB case before the United States District Court in the Southern District of New York. This paper addressed the key copyright issues raised in each case, including a discussion of relevant sections of the Copyright Law of the United States (17 U.S.C.) as well as suggestions the book and scholarly journal industries could consider addressing the insidious impact of copyright violations.  相似文献   

Teachers’ perceptions of effective teaching: a comparative study of elementary school teachers from China and the USA     

Lingqi Meng  Marco Muñoz 《Educational Assessment, Evaluation and Accountability》2016,28(2):179-199

This international study investigated Chinese and American elementary school teachers’ perceptions of effective teaching. The sample comprised Chinese (n?=?108) and US (n?=?110) participating teachers. The Effective Teaching Quality Survey (ETQS) was adopted for this comparative education research, an instrument that operationalized Stronge’s effective teaching theoretical framework. Research questions that guided this study were as follows: (1) what are the differences between the USA and China’s elementary school teachers’ perceptions regarding effective teaching? And (2) when comparing teaching experience, school location, and effective/ineffective teachers, what are the differences between the USA and China’s elementary school teachers’ perceptions on effective teaching? Statistically significant results were found when comparing nationality, teaching experience, school location, and effective/ineffective teaching. How these results related to the US and Chinese educational contexts with respect teaching and learning are discussed.  相似文献