|
Dissertation Abstracts, Dissertation Abstracts International (DAI) or the ProQuest Dissertations and Theses (PQDT) database is a bibliography of American (and international) dissertations published by University Microfilms International (UMI) / ProQuest, Ann Arbor, since 1938. UMI has had an agitated life and the bibliographical data have often shifted owner and name, and therefore appears under different labels. It covers doctoral dissertations accepted at an accredited American institution since 1861. Selected Masters theses have been included since 1962; since 1988, the database includes citations for dissertations from 50 British universities that are available at The British Document Supply Centre.〔Dialog Bluesheet #35: http://library.dialog.com/bluesheets/html/bl0035.html〕 Besides it covers a limited number of dissertations from the rest of the world. The print version is published monthly and cumulated annually an it is available both in softcover and on microfiche. It is divided in three sections: *Section A, Humanities and Social Sciences () *Section B, Sciences and Engineering () *Section C (DAI-C),(formerly ''European Dissertations'') () covers non-North American materials, most of them unavailable for purchase from ProQuest. As of 2008, ProQuest no longer offers DAI-C as a separate product. ==Form or Content== The usability of dissertation abstracts depends largely on their content. Many journals within the medical community have settled on a seven sentence structure, which is also gaining acceptance in the social sciences, education and business. In it, the purpose of the study and methodological choices are outlined succinctly, allowing the reader or researcher to quickly scan and evaluate a number of studies to easily choose ones that meet their particular demands. The structure contains variations on the following seven sentence stems: "The purpose of this study is...." "The scope of this study...." "The methodology...." "The Findings..." "Conclusions reached are ..." "Limitations of this study include...." "This study contributes...." Abstracts of dissertation proposals contain the same seven concepts, substituting data collection and analysis in place of findings and conclusions. Abstracts are limited in the United States by the UMI to 350 words. 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「Dissertations Abstracts」の詳細全文を読む スポンサード リンク
|