Table 2 Electronic databases used for searching
Database | Searched field | No of hits 3) | Date |
|---|---|---|---|
ISI Web of Science1) | topic | 3938 (3891) | 2014-05-13 |
Science Direct | title, abstract and keywords | 3272 (2869) | 2014-05-13 |
Engineering Village2) | subject/title/abstract | 1217 (728) | 2014-05-14 |
Scopus | title, abstract and keywords | 2502 (639) | 2014-05-14 |
Academic search premier | title/abstract/subject/keyword | 851 (815) | 2014-05-14 |
Wiley Online Library | abstract or title or keywords | 641 (548) | 2014-05-14 |
Directory of Open Access Journals | all fields | 42 (39) | 2014-05-14 |