{"_buckets": {"deposit": "af1ecdc5-a6f8-4a9e-b7ed-398f3a2672b7"}, "_deposit": {"created_by": 21, "id": "4254", "owners": [21], "pid": {"revision_id": 0, "type": "depid", "value": "4254"}, "status": "published"}, "_oai": {"id": "oai:ir.soken.ac.jp:00004254", "sets": ["274"]}, "author_link": ["734", "738", "1287"], "item_10001_biblio_info_7": {"attribute_name": "書誌情報", "attribute_value_mlt": [{"bibliographicIssueDates": {"bibliographicIssueDate": "1976", "bibliographicIssueDateType": "Issued"}, "bibliographicIssueNumber": "5", "bibliographicPageEnd": "1431", "bibliographicPageStart": "1419", "bibliographicVolumeNumber": "55", "bibliographic_titles": [{"bibliographic_title": "Progress of Theoretical Physics"}, {"bibliographic_title": "Progress of Theoretical Physics", "bibliographic_titleLang": "en"}]}]}, "item_10001_creator_3": {"attribute_name": "著者別名", "attribute_type": "creator", "attribute_value_mlt": [{"creatorNames": [{"creatorName": "池内, 了"}], "nameIdentifiers": [{"nameIdentifier": "738", "nameIdentifierScheme": "WEKO"}, {"nameIdentifier": "1000090025461", "nameIdentifierScheme": "NRID", "nameIdentifierURI": " "}, {"nameIdentifier": "90025461", "nameIdentifierScheme": "e-Rad", "nameIdentifierURI": "https://kaken.nii.ac.jp/ja/search/?qm=90025461"}]}]}, "item_10001_description_5": {"attribute_name": "抄録", "attribute_value_mlt": [{"subitem_description": "Nonlinear modulation of density wave in self-gravitating systems is studied by the reductive perturbation method. Using gas dynamical equations, an infinitely long rotating cylinder and an infinitesimally thin disk are considered. In the former system, both one-dimensional and two-dimensional modulations, the so-called self-focusing, are found to be stable for all wave number when the carrier wave propagates perpendicularly to rotational axis. In the latter system, amplitude modulation becomes unstable for large wave number. This unstable amplitude modulation grows to the envelope solitary wave in a time of the order of rotational one even if the amplitude of carrier wave is as low as one hundredth of zeroth order quantity. \n\nIt is concluded that nonlinear effects cannot be neglected in the density wave theory of spiral arms. The conjecture is proposed that this nonlinear modulationally unstable mode can be identified with the spiral arms of S-type galaxies.", "subitem_description_type": "Abstract"}]}, "item_10001_publisher_8": {"attribute_name": "出版者", "attribute_value_mlt": [{"subitem_publisher": "Oxford University Press "}]}, "item_10001_relation_14": {"attribute_name": "DOI", "attribute_value_mlt": [{"subitem_relation_name": [{"subitem_relation_name_text": "10.1143/PTP.55.1419 "}], "subitem_relation_type_id": {"subitem_relation_type_id_text": "https://doi.org/10.1143/PTP.55.1419", "subitem_relation_type_select": "DOI"}}]}, "item_10001_rights_15": {"attribute_name": "権利", "attribute_value_mlt": [{"subitem_rights": "©  2014  The Physical Society of Japan "}]}, "item_10001_source_id_9": {"attribute_name": "ISSN", "attribute_value_mlt": [{"subitem_source_identifier": "0033-068X", "subitem_source_identifier_type": "ISSN"}]}, "item_access_right": {"attribute_name": "アクセス権", "attribute_value_mlt": [{"subitem_access_right": "metadata only access", "subitem_access_right_uri": "http://purl.org/coar/access_right/c_14cb"}]}, "item_creator": {"attribute_name": "著者", "attribute_type": "creator", "attribute_value_mlt": [{"creatorNames": [{"creatorName": "IKEUCHI, Satoru"}], "nameIdentifiers": [{"nameIdentifier": "734", "nameIdentifierScheme": "WEKO"}]}, {"creatorNames": [{"creatorName": "NAKAMURA, Takashi"}], "nameIdentifiers": [{"nameIdentifier": "1287", "nameIdentifierScheme": "WEKO"}]}]}, "item_language": {"attribute_name": "言語", "attribute_value_mlt": [{"subitem_language": "eng"}]}, "item_resource_type": {"attribute_name": "資源タイプ", "attribute_value_mlt": [{"resourcetype": "journal article", "resourceuri": "http://purl.org/coar/resource_type/c_6501"}]}, "item_title": "Nonlinear Modulation of Density Wave in Self-Gravitating Systems", "item_titles": {"attribute_name": "タイトル", "attribute_value_mlt": [{"subitem_title": "Nonlinear Modulation of Density Wave in Self-Gravitating Systems"}, {"subitem_title": "Nonlinear Modulation of Density Wave in Self-Gravitating Systems", "subitem_title_language": "en"}]}, "item_type_id": "10001", "owner": "21", "path": ["274"], "permalink_uri": "https://ir.soken.ac.jp/records/4254", "pubdate": {"attribute_name": "公開日", "attribute_value": "2014-02-18"}, "publish_date": "2014-02-18", "publish_status": "0", "recid": "4254", "relation": {}, "relation_version_is_last": true, "title": ["Nonlinear Modulation of Density Wave in Self-Gravitating Systems"], "weko_shared_id": 21}