https://de.wikipedia.org/wiki/Bielefeld ... rch_Engine
BASE (Bielefeld Academic Search Engine) is a multi-disciplinary search engine to scholarly internet resources, created by Bielefeld University Library in Bielefeld, Germany. It is based on free and open-source software such as Apache Solr and VuFind. It harvests OAI metadata from institutional repositories and other academic digital libraries that implement the Open Archives Initiative Protocol for Metadata Harvesting (OAI-PMH), and then normalizes and indexes the data for searching. In addition to OAI metadata, the library indexes selected web sites and local data collections, all of which can be searched via a single search interface.
Users can search bibliographic metadata including abstracts, if available. However, BASE does not currently offer full text search. It contrasts with commercial search engines in multiple ways, including in the types and kinds of resources it searches and the information it offers about the results it finds. Results can be narrowed down using drill down menus (faceted search). Bibliographic data is provided in several formats, and the results may be sorted by multiple fields, such as by author or year of publication.
example "retrieval in foreign language learning"
https://www.base-search.net/Search/Resu ... &oaboost=1
Using day and night – scheduling retrieval practice and sleep
Sleep right after studying new material is more conducive to memory than a period of wakefulness. Another way to counteract forgetting is to practice retrieval: taking a test strengthens memory more effectively than restudying the material. The current work aims at investigating the interaction between sleep and testing by asking if testing adds to, neutralizes, or decreases the effect of sleep on memory? We tested this in one pilot and one experiment by manipulating the timing of the practice test as well as whether practice was followed by sleep or wakefulness when learning foreign language vocabulary. Taking a delayed practice test significantly reduces forgetting for both the sleep and the wakefulness group. An immediate practice test, in contrast, had no such effect; here we find the standard beneficial sleep effect. However, the immediate practice test leads to higher recall in the final test in comparison to a delayed practice test, but only for the sleep group. Practical recommendations imply two things: first, if students study in the evening, they should test themselves immediately after learning. Second, if students study during the day the practice test should be delayed in order to reinforce memory and reduce forgetting of the material.