{"id":"https://openalex.org/A5026277482","orcid":null,"observed_orcids":[],"display_name":"Erasmus Nnanna","raw_author_names":["E. Nnanna","Erasmus J. Nnanna","Erasmus John Nnanna","Erasmus NNANNA","Erasmus Nnanna","Nnanna Erasmus"],"full_name":"Erasmus John Nnanna","works_count":26,"cited_by_count":51,"summary_stats":{"2yr_mean_citedness":0.0,"h_index":4,"i10_index":2},"ids":{"openalex":"https://openalex.org/A5026277482","orcid":null,"observed_orcids":[]},"affiliations":[{"institution":{"id":"https://openalex.org/I100116408","ror":"https://ror.org/005bw2d06","display_name":"University of Port Harcourt","country_code":"NG","type":"education","lineage":["https://openalex.org/I100116408"]},"years":[2005]},{"institution":{"id":"https://openalex.org/I4210146904","ror":"https://ror.org/05a0mtz36","display_name":"Renewable Energy Corporation of India","country_code":"IN","type":"government","lineage":["https://openalex.org/I4210146904","https://openalex.org/I4210159250"]},"years":[2025]},{"institution":{"id":"https://openalex.org/I4210165255","ror":"https://ror.org/053x7m526","display_name":"Renewable Energy Corporation (Norway)","country_code":"NO","type":"company","lineage":["https://openalex.org/I4210165255"]},"years":[2025]},{"institution":{"id":"https://openalex.org/I7923278","ror":"https://ror.org/00b5m4j81","display_name":"Shell (Netherlands)","country_code":"NL","type":"company","lineage":["https://openalex.org/I7923278"]},"years":[2013]}],"last_known_institutions":null,"topics":[{"id":"https://openalex.org/T10892","display_name":"Drilling and Well Engineering","count":20,"subfield":{"id":"https://openalex.org/subfields/2103","display_name":"Fuel Technology"},"field":{"id":"https://openalex.org/fields/21","display_name":"Energy"},"domain":{"id":"https://openalex.org/domains/3","display_name":"Physical Sciences"}},{"id":"https://openalex.org/T13050","display_name":"Oil and Gas Production Techniques","count":18,"subfield":{"id":"https://openalex.org/subfields/2103","display_name":"Fuel Technology"},"field":{"id":"https://openalex.org/fields/21","display_name":"Energy"},"domain":{"id":"https://openalex.org/domains/3","display_name":"Physical Sciences"}},{"id":"https://openalex.org/T13925","display_name":"Offshore Engineering and Technologies","count":10,"subfield":{"id":"https://openalex.org/subfields/2212","display_name":"Ocean Engineering"},"field":{"id":"https://openalex.org/fields/22","display_name":"Engineering"},"domain":{"id":"https://openalex.org/domains/3","display_name":"Physical Sciences"}},{"id":"https://openalex.org/T11801","display_name":"Reservoir Engineering and Simulation Methods","count":7,"subfield":{"id":"https://openalex.org/subfields/2103","display_name":"Fuel Technology"},"field":{"id":"https://openalex.org/fields/21","display_name":"Energy"},"domain":{"id":"https://openalex.org/domains/3","display_name":"Physical Sciences"}},{"id":"https://openalex.org/T10399","display_name":"Hydrocarbon exploration and reservoir analysis","count":5,"subfield":{"id":"https://openalex.org/subfields/1907","display_name":"Geology"},"field":{"id":"https://openalex.org/fields/19","display_name":"Earth and Planetary Sciences"},"domain":{"id":"https://openalex.org/domains/3","display_name":"Physical Sciences"}}],"topic_share":[{"id":"https://openalex.org/T13050","display_name":"Oil and Gas Production Techniques","value":0.0002189,"subfield":{"id":"https://openalex.org/subfields/2103","display_name":"Fuel Technology"},"field":{"id":"https://openalex.org/fields/21","display_name":"Energy"},"domain":{"id":"https://openalex.org/domains/3","display_name":"Physical Sciences"}},{"id":"https://openalex.org/T10892","display_name":"Drilling and Well Engineering","value":0.0001074,"subfield":{"id":"https://openalex.org/subfields/2103","display_name":"Fuel Technology"},"field":{"id":"https://openalex.org/fields/21","display_name":"Energy"},"domain":{"id":"https://openalex.org/domains/3","display_name":"Physical Sciences"}},{"id":"https://openalex.org/T13925","display_name":"Offshore Engineering and Technologies","value":5.75e-05,"subfield":{"id":"https://openalex.org/subfields/2212","display_name":"Ocean Engineering"},"field":{"id":"https://openalex.org/fields/22","display_name":"Engineering"},"domain":{"id":"https://openalex.org/domains/3","display_name":"Physical Sciences"}},{"id":"https://openalex.org/T14224","display_name":"Oil, Gas, and Environmental Issues","value":5.25e-05,"subfield":{"id":"https://openalex.org/subfields/2105","display_name":"Renewable Energy, Sustainability and the Environment"},"field":{"id":"https://openalex.org/fields/21","display_name":"Energy"},"domain":{"id":"https://openalex.org/domains/3","display_name":"Physical Sciences"}},{"id":"https://openalex.org/T11801","display_name":"Reservoir Engineering and Simulation Methods","value":4.24e-05,"subfield":{"id":"https://openalex.org/subfields/2103","display_name":"Fuel Technology"},"field":{"id":"https://openalex.org/fields/21","display_name":"Energy"},"domain":{"id":"https://openalex.org/domains/3","display_name":"Physical Sciences"}}],"x_concepts":[{"id":"78762247","wikidata":"https://www.wikidata.org/wiki/Q1273174","display_name":"Petroleum engineering","score":0.6932079195976257},{"id":"41008148","wikidata":"https://www.wikidata.org/wiki/Q21198","display_name":"Computer science","score":0.6489201188087463},{"id":"39432304","wikidata":"https://www.wikidata.org/wiki/Q188847","display_name":"Environmental science","score":0.5889198184013367},{"id":"127313418","wikidata":"https://www.wikidata.org/wiki/Q1069","display_name":"Geology","score":0.5410884618759155},{"id":"127413603","wikidata":"https://www.wikidata.org/wiki/Q11023","display_name":"Engineering","score":0.42918941378593445}],"counts_by_year":[{"year":2005,"works_count":1,"oa_works_count":0,"cited_by_count":0},{"year":2008,"works_count":2,"oa_works_count":0,"cited_by_count":0},{"year":2009,"works_count":2,"oa_works_count":0,"cited_by_count":0},{"year":2010,"works_count":1,"oa_works_count":0,"cited_by_count":0},{"year":2012,"works_count":0,"oa_works_count":0,"cited_by_count":1},{"year":2013,"works_count":5,"oa_works_count":0,"cited_by_count":2},{"year":2014,"works_count":0,"oa_works_count":0,"cited_by_count":1},{"year":2015,"works_count":2,"oa_works_count":0,"cited_by_count":3},{"year":2016,"works_count":1,"oa_works_count":0,"cited_by_count":2},{"year":2017,"works_count":0,"oa_works_count":0,"cited_by_count":4},{"year":2018,"works_count":0,"oa_works_count":0,"cited_by_count":7},{"year":2019,"works_count":0,"oa_works_count":0,"cited_by_count":4},{"year":2020,"works_count":1,"oa_works_count":0,"cited_by_count":3},{"year":2021,"works_count":2,"oa_works_count":0,"cited_by_count":1},{"year":2022,"works_count":2,"oa_works_count":0,"cited_by_count":1},{"year":2023,"works_count":2,"oa_works_count":0,"cited_by_count":3},{"year":2024,"works_count":1,"oa_works_count":0,"cited_by_count":5},{"year":2025,"works_count":1,"oa_works_count":0,"cited_by_count":5},{"year":2026,"works_count":3,"oa_works_count":0,"cited_by_count":4}],"display_name_alternatives":["E. Nnanna","Erasmus J. Nnanna","Erasmus John Nnanna","Erasmus NNANNA","Erasmus Nnanna","Nnanna Erasmus"],"block_key":"e nnanna","works_api_url":"https://api.openalex.org/works?filter=author.id:A5026277482","updated_date":"2026-11-07T12:08:38","created_date":"2016-06-24T00:00:00"}