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Copyright of Journal of Agricultural Resources & Environment / Nongye Ziyuan yu Huanjing Xuebao is the property of Journal of Agricultural Resources & Environment Editorial Board and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

Copyright of Journal of Eastern Liaoning University (Social Sciences) is the property of Department of Journal of Eastern Liaoning University and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

Hassler Whitney is one of the most influential mathematicians in the 20th century. With an analysis based on the classification of primary sources, this paper discusses Whitney's work on graph theory before he switched to topology. It reviews his great contributions to planar graph, Hamiltonian circuits in planar graphs, chromatic polynomials and matroid theory, which was founded by Whitney in his paper entitled “On the abstract properties of linear dependence” in 1935. The results show that these contributions are closely related to the four-color conjecture. He made many theoretical achievements derived from it even though he didn't succeed. And his legacies have a great impact on the development of modern graph theory. A prime characteristic of Whitney's mathematical work is the search for inner reasons (SIR) for phenomena. And another one is the thought infiltration of topology into graph theory, which has significantly influenced graph theory and topology. It is expected to be beneficial for understanding Whitney's academic achievements in all aspects. [ABSTRACT FROM AUTHOR]

This paper compares media relations in Japan, South Korea, Taiwan, and the United States. There are several significant findings. First, the media-public relations practitioner relationship is more informal and closer in Asia than it is in the U.S. Second, media ethics, such as gift giving and informal gatherings, are different in these Asian cultures and in the U.S. Finally, the U.S. journalists and public relations practitioners have more positive attitudes toward on-line types of source-reporter relations than Asian journalists and practitioners do. Theoretical and practical implications are discussed based on the findings of this comparative analysis. [ABSTRACT FROM AUTHOR]

Natalie Zemon Davis is one of the pioneers in the study of international Women History. Her great contributions are laid on emphasizing the difference between the concepts of sex and gender and putting equal focus on the female and male history, which are the theoretic foundation of other historians who develop gender theory further. The paper presents her thought of women history and gender history based on her main works Society and Culture in Early Modern France, Fiction in the Archives and Women on the Margins from three aspects "female images under patriarchal control, female images from the lower classes, female images from margin to center". It also provides some references for historiophoty research at home by exploring her historical thoughts and methods. [ABSTRACT FROM AUTHOR]

After World War Two, Tibet became an essential part of US Asian strategy. On the eve of the founding of the People's Republic of China, the Central Intelligence Agency secretly dispatched its agents to Tibet, in an attempt to urge separatist forces in Tibet to establish close ties with the US. However, the US government has consistently denied its involvement. Drawing on the newly released US government files, this paper examines in detail the secret expedition of two CIA agents, Douglas Mackiernan and Frank Bessac, with the aim of restoring the historical truth of the covert US operation that backed the Tibetan separatists against the new-born power of China. [ABSTRACT FROM AUTHOR]