Purpose： In this contribution, we want to detect the document type profiles of the three prestigious journals Nature, Science, and Proceedings of the National Academy of Sciences of the United States （PNAS） with re...Purpose： In this contribution, we want to detect the document type profiles of the three prestigious journals Nature, Science, and Proceedings of the National Academy of Sciences of the United States （PNAS） with regard to two levels： journal and country. Design/methodology/approach： Using relative values based on fractional counting, we investigate the distribution of publications across document types at both the journal and country level, and we use （cosine） document type profile similarity values to compare pairs of publication years within countries. Findings： Nature and Science mainly publish Editorial Material, Article, News Item and Letter, whereas the publications of PNAS are heavily concentrated on Article. The shares of Article for Nature and Science are decreasing slightly from 1999 to 2014, while the corresponding shares of Editorial Material are increasing. Most studied countries focus on Article and Letter in Nature, but on Letter in Science and PNAS. The document type profiles of some of the studied countries change to a relatively large extent over publication years. Research limitations： The main limitation of this research concerns the Web of Science classification of publications into document types. Since the analysis of the paper is based on document types of Web of Science, the classification in question is not free from errors, and the accuracy of the analysis might be affected.Practical implications： Results show that Nature and Science are quite diversified with regard to document types. In bibliometric assessments, where publications in Nature and Science play a role, other document types than Article and Review might therefore be taken into account. Originality/value： Results highlight the importance of other document types than Article and Review in Nature and Science. Large differences are also found when comparing the country document type profiles of the three journals with the corresponding profiles in all Web of Science journals.展开更多
Timing is everything.Nowhere is it truer than in the current global climatic conditions.As rainfall patterns change and temperature levels increase dramatically, water shortages,particularly in developing nations, hav...Timing is everything.Nowhere is it truer than in the current global climatic conditions.As rainfall patterns change and temperature levels increase dramatically, water shortages,particularly in developing nations, have reached record highs 20 years ahead of predictions and severe food shortage is the eventual result.Climate change may well exacerbate chronic hunger and malnutrition across much of展开更多
Aims: The Journal of Geodesy and Geoinformation Science is an official publication of the Chinese Society for Geodesy. Photogrammetry and Cartography. The Journal aims to facilitate and strengthen academic exchange on...Aims: The Journal of Geodesy and Geoinformation Science is an official publication of the Chinese Society for Geodesy. Photogrammetry and Cartography. The Journal aims to facilitate and strengthen academic exchange on geodesy and geoinformation research between China and other countries.展开更多
Childhood obesity has become a concern in most economically developing countries.The reasons for this seem clear:too much food and not enough movement.This dilemma has received much scientific attention,and the questi...Childhood obesity has become a concern in most economically developing countries.The reasons for this seem clear:too much food and not enough movement.This dilemma has received much scientific attention,and the question arises:How do we get children to move and make good eating choices?In their opinion piece in this issue of the Journal of Sport and Health Science(JSHS),Ring-Dimitriou et al.1 make an argument that playing structured and supervised traditional sports will help children with obesity,where traditional sports include football,handball,gymnastics,athletics,and martial arts.展开更多
基金supported by the National Natural Science Foundation of China(Grant No.:L1524037)
文摘Purpose： In this contribution, we want to detect the document type profiles of the three prestigious journals Nature, Science, and Proceedings of the National Academy of Sciences of the United States （PNAS） with regard to two levels： journal and country. Design/methodology/approach： Using relative values based on fractional counting, we investigate the distribution of publications across document types at both the journal and country level, and we use （cosine） document type profile similarity values to compare pairs of publication years within countries. Findings： Nature and Science mainly publish Editorial Material, Article, News Item and Letter, whereas the publications of PNAS are heavily concentrated on Article. The shares of Article for Nature and Science are decreasing slightly from 1999 to 2014, while the corresponding shares of Editorial Material are increasing. Most studied countries focus on Article and Letter in Nature, but on Letter in Science and PNAS. The document type profiles of some of the studied countries change to a relatively large extent over publication years. Research limitations： The main limitation of this research concerns the Web of Science classification of publications into document types. Since the analysis of the paper is based on document types of Web of Science, the classification in question is not free from errors, and the accuracy of the analysis might be affected.Practical implications： Results show that Nature and Science are quite diversified with regard to document types. In bibliometric assessments, where publications in Nature and Science play a role, other document types than Article and Review might therefore be taken into account. Originality/value： Results highlight the importance of other document types than Article and Review in Nature and Science. Large differences are also found when comparing the country document type profiles of the three journals with the corresponding profiles in all Web of Science journals.
文摘Timing is everything.Nowhere is it truer than in the current global climatic conditions.As rainfall patterns change and temperature levels increase dramatically, water shortages,particularly in developing nations, have reached record highs 20 years ahead of predictions and severe food shortage is the eventual result.Climate change may well exacerbate chronic hunger and malnutrition across much of
文摘Aims: The Journal of Geodesy and Geoinformation Science is an official publication of the Chinese Society for Geodesy. Photogrammetry and Cartography. The Journal aims to facilitate and strengthen academic exchange on geodesy and geoinformation research between China and other countries.
文摘Childhood obesity has become a concern in most economically developing countries.The reasons for this seem clear:too much food and not enough movement.This dilemma has received much scientific attention,and the question arises:How do we get children to move and make good eating choices?In their opinion piece in this issue of the Journal of Sport and Health Science(JSHS),Ring-Dimitriou et al.1 make an argument that playing structured and supervised traditional sports will help children with obesity,where traditional sports include football,handball,gymnastics,athletics,and martial arts.
