Bielefeld Academic Search Engine

Latest screenshot: 2024-07-14

Access to search interface:

open

Last major interface update:

2018-05-15

Owner of search system:

Universitätsbibliothek Bielefeld

Location of system headquarters:

Bielefeld, DE

Year of launch:

2004

Type:

Search engine

URL:

https://www.base-search.net/Search/Advanced

Help URL:

https://www.base-search.net/about/en/help.php

Twitter:

@BASEsearch

Description of database (by system owner)

Collects records from over 10,000 sources. The largest providers are: DataCite Metadata Store (TIB Hannover); ScienceDirect (Elsevier - via Crossref); Springer Nature (via Crossref); Wiley Online Library (via Crossref); Directory of Open Access Journals; PubMed Central (PMC); Gallica - bibliothèque numérique de la Bibliothèque nationale de France (BnF); Informa (via Crossref); IEEE Publications (via Crossref); Oxford University Press (via Crossref); RePEc; Archive ouverte HAL; Zenodo; SAGE Publications (via Crossref); JSTOR (via Crossref) - and many more...

Description of search system (by system owner)

BASE is one of the world's most voluminous search engines especially for academic web resources. BASE provides more than 240 million documents from more than 8,000 content providers. You can access the full texts of about 60% of the indexed documents for free (Open Access).

Total coverage:

274.90M

Year-over-year growth (2019-2020):

-0.87%

Subject coverage:

Multidisciplinary

Retrospective coverage:

1000–2021

Record types:

Open Access records:

164.80M / 59.95%

Search functionality and interface

Systematic keyword searching:

limited

Backward citation searching:

sufficient

Forward citation searching:

sufficient

Query builder:

Search history:

Match preview:

Sorting options:

Query

Latency with short query:

3.08 seconds

Latency with long query:

14.47 seconds

Controlled vocabulary:

Field codes:

Full text search:

Search string length (narrow):

25 terms max.

Search string length (wide):

25 terms max.

Language support: Chinese:

Language support: Cyrillic:

Truncation:

Wildcards:

Keyword position irrelevant:

Longer strings, fewer hits:

Automatic query expansion (stemming):

Verbatim queries:

Reproducible queries (time):

Reproducible queries (locations):

Operators

Search operators:

Boolean 'OR':

Boolean 'AND':

Boolean 'NOT':

Proximity operator:

Boolean works exact:

Nested search (parentheses):

Citation search / filtering

Record type filters:

Results filters:

Suggested related records:

Supported by bibliometric tools:

N/A

Backward citation information:

Backward citation score:

48.77%

Forward citation information:

Forward citation score:

36.09%

Retrieval

Number of accessible records:

1000

Bulk select records:

Bulk export records:

100

Export formats:

API:

upon request

Bulk select records' backward citations:

Bulk export backward citations:

Bulk select records' forward citations:

Bulk export forward citations:

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