{"id":"https://openalex.org/W1998556705","doi":"https://doi.org/10.1007/s102550200023","title":"Boundary Value Problems for Singular Second-Order Functional Differential Equations","display_name":"Boundary Value Problems for Singular Second-Order Functional Differential Equations","publication_year":2002,"publication_date":"2002-06-01","ids":{"openalex":"https://openalex.org/W1998556705","doi":"https://doi.org/10.1007/s102550200023","mag":"1998556705"},"language":"en","primary_location":{"id":"doi:10.1007/s102550200023","doi":"https://doi.org/10.1007/s102550200023","is_oa":false,"landing_page_url":"https://doi.org/10.1007/s102550200023","pdf_url":null,"source":{"id":"https://openalex.org/S77092102","display_name":"Acta Mathematicae Applicatae Sinica English Series","issn_l":"0168-9673","issn":["0168-9673","1618-3932"],"is_oa":false,"is_in_doaj":false,"is_core":true,"listed_in":["cwts-core","jufo-1","norway-1"],"host_organization":"https://openalex.org/P4310319900","host_organization_name":"Springer Science+Business Media","host_organization_lineage":["https://openalex.org/P4310319900","https://openalex.org/P4310319965"],"host_organization_lineage_names":["Springer Science+Business Media","Springer Nature"],"type":"journal"},"license":null,"license_id":null,"version":"publishedVersion","is_accepted":true,"is_published":true,"raw_source_name":"Acta Mathematicae Applicatae Sinica, English Series","raw_type":"journal-article"},"volume":null,"type":"article","indexed_in":["crossref"],"open_access":{"is_oa":false,"oa_status":"closed","oa_url":null,"any_repository_has_fulltext":false},"authorships":[{"author_position":"first","author":{"id":"https://openalex.org/A5006320923","display_name":"Liu Hui-zhao","orcid":"https://orcid.org/0000-0002-4988-8990","observed_orcids":["https://orcid.org/0000-0002-4988-8990"]},"institutions":[{"id":"https://openalex.org/I184843921","display_name":"Hebei University of Technology","ror":"https://ror.org/018hded08","country_code":"CN","type":"education","lineage":["https://openalex.org/I184843921"]}],"countries":["CN"],"is_corresponding":true,"raw_author_name":"Hui-zhao Liu","raw_affiliation_strings":["Department of Applied Mathematics, Hebei University of Technology, Tianjin, 300130, China","Department of Applied Mathematics, Hebei University of Technology, Tianjin, China"],"raw_orcid":null,"affiliations":[{"raw_affiliation_string":"Department of Applied Mathematics, Hebei University of Technology, Tianjin, 300130, China","institution_ids":["https://openalex.org/I184843921"]},{"raw_affiliation_string":"Department of Applied Mathematics, Hebei University of Technology, Tianjin, China","institution_ids":["https://openalex.org/I184843921"]}]},{"author_position":"middle","author":{"id":"https://openalex.org/A5109304950","display_name":"Daqing Jiang","orcid":"https://orcid.org/0000-0003-2439-6292","observed_orcids":["https://orcid.org/0000-0003-2439-6292","https://orcid.org/0000-0002-7026-3127"]},"institutions":[{"id":"https://openalex.org/I184983240","display_name":"Northeast Normal University","ror":"https://ror.org/02rkvz144","country_code":"CN","type":"education","lineage":["https://openalex.org/I184983240"]}],"countries":["CN"],"is_corresponding":false,"raw_author_name":"Da-qing Jiang","raw_affiliation_strings":["Department of Mathematics, Northeast Normal University, Changchun, 130024, China","Department of Mathematics , Northeast Normal University , Changchun , China"],"raw_orcid":null,"affiliations":[{"raw_affiliation_string":"Department of Mathematics, Northeast Normal University, Changchun, 130024, China","institution_ids":["https://openalex.org/I184983240"]},{"raw_affiliation_string":"Department of Mathematics , Northeast Normal University , Changchun , China","institution_ids":["https://openalex.org/I184983240"]}]},{"author_position":"last","author":{"id":"https://openalex.org/A5100322888","display_name":"Yan Wang","orcid":"https://orcid.org/0000-0003-1060-2956","observed_orcids":["https://orcid.org/0000-0003-1060-2956","https://orcid.org/0009-0006-1080-5488"]},"institutions":[{"id":"https://openalex.org/I184843921","display_name":"Hebei University of Technology","ror":"https://ror.org/018hded08","country_code":"CN","type":"education","lineage":["https://openalex.org/I184843921"]}],"countries":["CN"],"is_corresponding":false,"raw_author_name":"Yan Wang","raw_affiliation_strings":["Department of Applied Mathematics, Hebei University of Technology, Tianjin, 300130, China","Department of Applied Mathematics, Hebei University of Technology, Tianjin, China"],"raw_orcid":null,"affiliations":[{"raw_affiliation_string":"Department of Applied Mathematics, Hebei University of Technology, Tianjin, 300130, China","institution_ids":["https://openalex.org/I184843921"]},{"raw_affiliation_string":"Department of Applied Mathematics, Hebei University of Technology, Tianjin, China","institution_ids":["https://openalex.org/I184843921"]}]}],"institutions":[],"countries_distinct_count":1,"institutions_distinct_count":2,"corresponding_author_ids":["https://openalex.org/A5006320923"],"corresponding_institution_ids":["https://openalex.org/I184843921"],"apc_list":{"value":3490,"currency":"USD","value_usd":3490},"apc_paid":null,"fwci":0.0,"has_fulltext":false,"cited_by_count":0,"citation_normalized_percentile":{"value":0.21538462,"is_in_top_1_percent":false,"is_in_top_10_percent":false},"cited_by_percentile_year":null,"biblio":{"volume":"18","issue":"2","first_page":"249","last_page":"254"},"is_retracted":false,"is_paratext":false,"is_xpac":false,"primary_topic":{"id":"https://openalex.org/T10541","display_name":"Nonlinear Differential Equations Analysis","score":0.9990000128746033,"subfield":{"id":"https://openalex.org/subfields/2604","display_name":"Applied Mathematics"},"field":{"id":"https://openalex.org/fields/26","display_name":"Mathematics"},"domain":{"id":"https://openalex.org/domains/3","display_name":"Physical Sciences"}},"topics":[{"id":"https://openalex.org/T10541","display_name":"Nonlinear Differential Equations Analysis","score":0.9990000128746033,"subfield":{"id":"https://openalex.org/subfields/2604","display_name":"Applied Mathematics"},"field":{"id":"https://openalex.org/fields/26","display_name":"Mathematics"},"domain":{"id":"https://openalex.org/domains/3","display_name":"Physical Sciences"}},{"id":"https://openalex.org/T12589","display_name":"Differential Equations and Boundary Problems","score":0.0003000000142492354,"subfield":{"id":"https://openalex.org/subfields/2604","display_name":"Applied Mathematics"},"field":{"id":"https://openalex.org/fields/26","display_name":"Mathematics"},"domain":{"id":"https://openalex.org/domains/3","display_name":"Physical Sciences"}},{"id":"https://openalex.org/T11777","display_name":"Fixed Point Theorems Analysis","score":9.999999747378752e-05,"subfield":{"id":"https://openalex.org/subfields/2608","display_name":"Geometry and Topology"},"field":{"id":"https://openalex.org/fields/26","display_name":"Mathematics"},"domain":{"id":"https://openalex.org/domains/3","display_name":"Physical Sciences"}}],"keywords":[{"id":"https://openalex.org/keywords/boundary-value-problems","display_name":"boundary value problems","score":0.8930000066757202},{"id":"https://openalex.org/keywords/second-order-functional-differential-equations","display_name":"second-order functional differential equations","score":0.8460000157356262},{"id":"https://openalex.org/keywords/singular-differential-equations","display_name":"singular differential equations","score":0.9020000100135803},{"id":"https://openalex.org/keywords/positive-solutions","display_name":"positive solutions","score":0.9890000224113464},{"id":"https://openalex.org/keywords/existence-of-solutions","display_name":"existence of solutions","score":0.7929999828338623},{"id":"https://openalex.org/keywords/schauder-fixed-point-theorem","display_name":"Schauder fixed point theorem","score":0.9779999852180481},{"id":"https://openalex.org/keywords/nonlocal-boundary-conditions","display_name":"nonlocal boundary conditions","score":0.6019999980926514}],"concepts":[{"id":"https://openalex.org/C33923547","wikidata":"https://www.wikidata.org/wiki/Q395","display_name":"Mathematics","level":0,"score":0.6457201242446899},{"id":"https://openalex.org/C182306322","wikidata":"https://www.wikidata.org/wiki/Q1779371","display_name":"Order (exchange)","level":2,"score":0.6426142454147339},{"id":"https://openalex.org/C16171025","wikidata":"https://www.wikidata.org/wiki/Q863349","display_name":"Singularity","level":2,"score":0.6127963066101074},{"id":"https://openalex.org/C114614502","wikidata":"https://www.wikidata.org/wiki/Q76592","display_name":"Combinatorics","level":1,"score":0.5064738988876343},{"id":"https://openalex.org/C134306372","wikidata":"https://www.wikidata.org/wiki/Q7754","display_name":"Mathematical analysis","level":1,"score":0.40491804480552673},{"id":"https://openalex.org/C10138342","wikidata":"https://www.wikidata.org/wiki/Q43015","display_name":"Finance","level":1,"score":0.0},{"id":"https://openalex.org/C162324750","wikidata":"https://www.wikidata.org/wiki/Q8134","display_name":"Economics","level":0,"score":0.0}],"mesh":[],"locations_count":1,"locations":[{"id":"doi:10.1007/s102550200023","doi":"https://doi.org/10.1007/s102550200023","is_oa":false,"landing_page_url":"https://doi.org/10.1007/s102550200023","pdf_url":null,"source":{"id":"https://openalex.org/S77092102","display_name":"Acta Mathematicae Applicatae Sinica English Series","issn_l":"0168-9673","issn":["0168-9673","1618-3932"],"is_oa":false,"is_in_doaj":false,"is_core":true,"listed_in":["cwts-core","jufo-1","norway-1"],"host_organization":"https://openalex.org/P4310319900","host_organization_name":"Springer Science+Business Media","host_organization_lineage":["https://openalex.org/P4310319900","https://openalex.org/P4310319965"],"host_organization_lineage_names":["Springer Science+Business Media","Springer Nature"],"type":"journal"},"license":null,"license_id":null,"version":"publishedVersion","is_accepted":true,"is_published":true,"raw_source_name":"Acta Mathematicae Applicatae Sinica, English Series","raw_type":"journal-article"}],"best_oa_location":null,"sustainable_development_goals":[],"sustainable_development_goals_aurora":[],"study_designs":[],"awards":[],"funders":[],"has_content":{"grobid_xml":false,"pdf":false},"content_urls":null,"referenced_works_count":6,"referenced_works":["https://openalex.org/W1970375348","https://openalex.org/W1975221158","https://openalex.org/W2004551296","https://openalex.org/W2027247693","https://openalex.org/W2141347481","https://openalex.org/W2219910006"],"related_works":["https://openalex.org/W1979597421","https://openalex.org/W2007980826","https://openalex.org/W4245490552","https://openalex.org/W2061531152","https://openalex.org/W3002753104","https://openalex.org/W2077600819","https://openalex.org/W1587224694","https://openalex.org/W2042127053","https://openalex.org/W2142036596","https://openalex.org/W2072657027"],"abstract_inverted_index":null,"counts_by_year":[],"updated_date":"2026-09-24T07:57:37.273135","created_date":"2025-10-10T00:00:00"}