scholarly journals Comparison of the Alkali-Silica Reactivity of North Cyprus and South Cyprus aggregates; preliminary studies using RILEM method

2021 ◽  
Vol 304 ◽  
pp. 02001
Author(s):  
Pinar Akpinar ◽  
Andisheh Zahedi
Keyword(s):  
Pore Solution ◽  
Scientific Information ◽  
Alkali Silica Reaction ◽  
Concrete Durability ◽  
Limited Extent ◽  
The Past ◽  
North Cyprus ◽  
Alkali Silica Reactivity ◽  
North And South ◽  
Comparative Manner

Alkali-silica reaction (ASR) is regarded as one of the most deleterious concrete durability problems, known to cause severe deteriorations in reinforced concrete structures all around the world. ASR involves the reaction of alkaline concrete pore solution with silica minerals in the aggregates and as a result, hydrous alkali-silica gel is produced. Expansion caused by this gel upon absorbing moisture results in serious deterioration in concrete. Although the susceptibility of South Cyprus aggregates to ASR has been previously studied to a very limited extent in the past, no scientific information on the ASR susceptibility of North Cyprus aggregates are available in the related literature. Beşparmak (Pentadaktylos) Mountains (North Cyprus) and from Troodos Mountains (South Cyprus) are positioned close to each other; however, aggregates obtained from both mountains are known to differ in composition. This difference in composition has the potential to yield ASR performances varying significantly. The aim of this study was to carry out preliminary investigations on the alkali-silica reactivity performance of both North and South Cyprus aggregates under same conditions, in a systematic and comparative manner. Aggregates obtained from both mountains are tested in combination with CEM I and CEM II (with supplementary cemenetitious materials) under the exposure conditions of RILEM method AAR-2. Preliminary results showed that North Cyprus aggregates are potentially reactive when used with CEM II, where South Cyprus aggregates tested under same conditions are detected to have much higher levels of reactivity.

RESEARCH COLLABORATION AMONG LIBRARY AND INFORMATION SCIENCE SCHOOLS IN SOUTH AFRICA (1991–2012): AN INFORMETRICS STUDY

Mousaion ◽  
2017 ◽  
Vol 34 (3) ◽  
pp. 36-59 ◽  
Author(s):  
Jan R. Maluleka ◽  
Omwoyo B. Onyancha
Keyword(s):  
South Africa ◽  
Information Science ◽  
Research Collaboration ◽  
Science And Technology ◽  
Library And Information Science ◽  
Limited Extent ◽  
Microsoft Excel ◽  
The Past ◽  
Software Packages ◽  
Collaborative Activities

This study sought to assess the extent of research collaboration in Library and Information Science (LIS) schools in South Africa between 1991 and 2012. Informetric research techniques were used to obtain relevant data for the study. The data was extracted from two EBSCO-hosted databases, namely, Library and Information Science Source (LISS) and Library, Information Science and Technology Abstracts (LISTA). The search was limited to scholarly peer reviewed articles published between 1991 and 2012. The data was analysed using Microsoft Excel ©2010 and UCINET for Windows ©2002 software packages. The findings revealed that research collaboration in LIS schools in South Africa has increased over the past two decades and mainly occurred between colleagues from the same department and institution; there were also collaborative activities at other levels, such as inter-institutional and inter-country, although to a limited extent; differences were noticeable when ranking authors according to different computations of their collaborative contributions; and educator-practitioner collaboration was rare. Several conclusions and recommendations based on the findings are offered in the article.

IV.—The Geological Development, Descent and Distribution of the Mammalia

1893 ◽  
Vol 10 (9) ◽  
pp. 401-412 ◽  
Author(s):  
Karl A. von Zittel
Keyword(s):  
South America ◽  
The Past ◽  
Limited Experience ◽  
The World ◽  
Relationship Of ◽  
North And South America ◽  
The Relationship ◽  
North And South ◽  
Animal World

In a spirited treatise on the ‘Origin of our Animal World’ Prof. L. Rütimeyer, in the year 1867, described the geological development and distribution of the mammalia, and the relationship of the different faunas of the past with each other and with that now existing. Although, since the appearance of that masterly sketch the palæontological material has been, at least, doubled through new discoveries in Europe and more especially in North and South America, this unexpected increase has in most instances only served as a confirmation of the views which Rutimeyer advanced on more limited experience. At present, Africa forms the only great gap in our knowledge of the fossil mammalia; all the remaining parts of the world can show materials more or less abundantly, from which the course followed by the mammalia in their geological development can be traced with approximate certainty.

scholarly journals Teaching Science in Today’s Society: The Case of Particle Physics for Primary Schools

Universe ◽  
2021 ◽  
Vol 7 (6) ◽  
pp. 169
Author(s):  
Cristina Lazzeroni ◽  
Sandra Malvezzi ◽  
Andrea Quadri
Keyword(s):  
Particle Physics ◽  
Primary Schools ◽  
Scientific Information ◽  
Decision Makers ◽  
Educational Institutions ◽  
The Public ◽  
The Past ◽  
Rapid Changes ◽  
The Subject ◽  
Ongoing Project

The rapid changes in science and technology witnessed in recent decades have significantly contributed to the arousal of the awareness by decision-makers and the public as a whole of the need to strengthen the connection between outreach activities of universities and research institutes and the activities of educational institutions, with a central role played by schools. While the relevance of the problem is nowadays unquestioned, no unique and fully satisfactory solution has been identified. In the present paper we would like to contribute to the discussion on the subject by reporting on an ongoing project aimed to teach Particle Physics in primary schools. We will start from the past and currently planned activities in this project in order to establish a broader framework to describe the conditions for the fruitful interplay between researchers and teachers. We will also emphasize some aspects related to the dissemination of outreach materials by research institutions, in order to promote the access and distribution of scientific information in a way suited to the different age of the target students.

Editorial

2003 ◽  
Vol 9 (2) ◽  
pp. 95-95
Author(s):  
Charles E. Lyman
Keyword(s):  
Impact Factor ◽  
Scientific Information ◽  
Life Sciences ◽  
Editorial Board Member ◽  
Initial Letter ◽  
Strong Impact ◽  
National Library ◽  
The Past ◽  
Number Of Citations

Microscopy and Microanalysis has made significant strides forward over the past year, and I would like to comment on two of these. First, the Institute for Scientific Information (ISI) ranked this journal third among the nine microscopy journals it indexes. The ranking was in terms of ISI's Impact Factor, which tracks the number of citations to papers published in the journal. A strong Impact Factor indicates that information in the journal is of interest to other workers in the field. Second, the National Library of Medicine (NLM) has selected Microscopy and Microanalysis to be indexed in MEDLINE (PubMed), beginning with the first issue of 2003. As any biologist will tell you, this listing is essential for the electronic visibility of papers in the fast-moving world of life sciences research. I thank Editorial Board member Dave Piston for his efforts in writing the initial letter of application to the NLM.

The History and Future of Scientific Publishing

2020 ◽  
pp. 10-33
Author(s):  
Alan Kelly
Keyword(s):  
Sixteenth Century ◽  
Open Access ◽  
Scientific Community ◽  
Scientific Information ◽  
Scientific Paper ◽  
Scientific Journals ◽  
Scientific Publishing ◽  
The Past ◽  
Current State ◽  
Open Access Journals

This chapter reviews the development of the modern scientific paper, from the sixteenth century forward, and explores the ways in which scientific information has been disseminated in the past. Great scientific advances of the past are discussed in the context of how they were first published, or otherwise brought to the attention of the broader scientific community, and the modern scientific publishing sector is explored. The types and categories of scientific journals are discussed, along with an overview of current publishing trends, such as the exponential increase in number of journals, changes in the ways in which researchers access the literature, and in particular the emergence and current state of open access journals. In addition, various ways in which journals are ranked are discussed, and key trends in such lists over the last ten years or so explored.

scholarly journals Alkali-Silica Reaction Resistance and Pore Solution Composition of Low-Calcium Fly Ash-Based Geopolymer Concrete

2020 ◽  
Vol 5 (11) ◽  
pp. 96
Author(s):  
Jiawei Lei ◽  
Jiajun Fu ◽  
En-Hua Yang
Keyword(s):  
Fly Ash ◽  
Pore Solution ◽  
Systematic Investigation ◽  
Alkali Silica Reaction ◽  
Geopolymer Concrete ◽  
Portland Cement Concrete ◽  
Solution Composition ◽  
Low Calcium ◽  
Underlying Mechanisms ◽  
One Year

Low-calcium fly ash-based geopolymer concrete is generally reported to be less vulnerable to alkali-silica reaction (ASR) than conventional ordinary Portland cement concrete. However, the lack of understanding of pore solution composition of the low-calcium fly ash-based geopolymer limits the investigation of the underlying mechanisms for the low ASR-induced expansion in the geopolymer concrete. This study presents a systematic investigation of the pore solution composition of a low-calcium fly ash-based geopolymer over a period of one year. The results show that the pore solution of the fly ash geopolymer is mainly composed of alkali ions, silicates, and aluminosilicates species. The lower expansion of the geopolymer concrete in the current study is most probably due to the insufficient alkalinity in the geopolymer pore solution as the hydroxide ions are largely consumed for the fly ash dissolution.

scholarly journals Ondernemingsvooruitskatting in die groot vervaardigingsondernemings in Suid-Afrika, 1978

1979 ◽  
Vol 10 (4) ◽  
pp. 125-130
Author(s):  
Fanus C. Gous
Keyword(s):  
South Africa ◽  
Empirical Study ◽  
Limited Extent ◽  
The Past ◽  
Business Forecasting ◽  
The Subject ◽  
Suitable Technique ◽  
Relevant Factors

Business forecasting in the large manufacturing concerns in South Africa, 1978. Business forecasting has developed rapidly over the past few years as a result of the increasing complexity of the environment of the firm. Some overseas writers assert that the application thereof has developed more slowly than the theory connected to it: although businesses are aware of the necessity and existence of literature on the subject, it is only to a limited extent applied on an organized basis. Overseas businesses apparently experience three problems: a preference for the application of certain techniques is built up so that more suitable techniques are not utilized; not all relevant factors are taken into consideration in the choice of the most suitable technique; and managers often do forecasting themselves even though they possess little knowledge thereof. An empirical study has shown that similar problems are encountered by the relatively large manufacturing concerns in South Africa.Ondernemingsvooruitskatting het gedurende die afgelope jare, as gevolg van die toenemende kompleksiteit in die ondernemingsomgewing, vinnig ontwikkel. Sommige oorsese skrywers beweer dat die toepassing daarvan stadiger ontwikkel het as die teorie daaraan verbonde: ondernemings, alhoewel bewus van die noodsaaklikheid daarvan en ook van die bestaan van literatuur daaroor, pas dit in 'n beperkte mate op georganiseerde grondslag toe. Blykbaar ondervind oorsese ondernemings veral drie probleme: 'n voorkeur vir die toepassing van bepaalde tegnieke word opgebou sodat meer toepaslike tegnieke nie benut word nie; alle relevante faktore word nie in ag geneem by die keuse van die tegniek nie; en bestuurders doen dikwels self vooruitskatting alhoewel hulle oor weinig kennis daarvan beskik. 'n Empiriese studie het getoon dat soortgelyke probleme deur die relatief groot vervaardigingsondernemings in Suid-Afrika ondervind word.

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