{"created":"2023-07-25T11:00:25.291001+00:00","id":2236,"links":{},"metadata":{"_buckets":{"deposit":"4e0f92a2-3e15-4b8b-b84f-7919fcb0bb47"},"_deposit":{"created_by":4,"id":"2236","owners":[4],"pid":{"revision_id":0,"type":"depid","value":"2236"},"status":"published"},"_oai":{"id":"oai:nipr.repo.nii.ac.jp:00002236","sets":["1:356:403"]},"author_link":["1814","60206","60205"],"item_1_biblio_info_14":{"attribute_name":"書誌情報","attribute_value_mlt":[{"bibliographicIssueDates":{"bibliographicIssueDate":"1994-03","bibliographicIssueDateType":"Issued"},"bibliographicPageEnd":"326","bibliographicPageStart":"314","bibliographicVolumeNumber":"49","bibliographic_titles":[{"bibliographic_title":"Memoirs of National Institute of Polar Research. Special issue"}]}]},"item_1_creator_8":{"attribute_name":"著者名(英)","attribute_type":"creator","attribute_value_mlt":[{"creatorNames":[{"creatorName":"Nagornov,O. V.","creatorNameLang":"en"}],"nameIdentifiers":[{}]},{"creatorNames":[{"creatorName":"Zagorodnov V. S.","creatorNameLang":"en"}],"nameIdentifiers":[{}]},{"creatorNames":[{"creatorName":"Kelley,J. J.","creatorNameLang":"en"}],"nameIdentifiers":[{}]}]},"item_1_description_1":{"attribute_name":"ページ属性","attribute_value_mlt":[{"subitem_description":"P(論文)","subitem_description_type":"Other"}]},"item_1_description_12":{"attribute_name":"抄録(英)","attribute_value_mlt":[{"subitem_description":"Thermal ice coring processes are accompanied by stresses in an ice core; micro-and macro-cracks are formed. Contamination under mechanical and thermal drilling usually penetrates from 5 to 30mm into the ice core. The quality of ice core acquired by thermal drilling depends on thermal stresses. To improve ice core quality, experimental and theoretical studies have been done. A prototype model of an antifreeze thermal electric drill (ATED) was tested. Temperature distribution in an ice core during thermal drilling was measured with thermocouples. To study temperature and stress distributions in an ice core, a mathematical model was developed. Impacts of ethanol-water solution (EWS) and kerosene on temperature and thermal stresses in an ice core were also studied. The experiments and model simulations have shown that thermal stresses in an ice core are proportional to the ratio of drilling bit length to penetration rate. The maximal thermal stresses in an ice core during thermal drilling exhibit only weak dependence on the type of borehole liquid. Forced circulation of the borehole liquid at the kerf leads to reduced depth of cracks by about 10mm.","subitem_description_type":"Other"}]},"item_1_source_id_13":{"attribute_name":"雑誌書誌ID","attribute_value_mlt":[{"subitem_source_identifier":"AA00733561","subitem_source_identifier_type":"NCID"}]},"item_1_text_10":{"attribute_name":"著者所属(英)","attribute_value_mlt":[{"subitem_text_language":"en","subitem_text_value":"Moscow Engineering Physics Institute/Polar Ice Coring Office, University of Alaska Fairbanks/Polar Ice Coring Office, University of Alaska Fairbanks"}]},"item_files":{"attribute_name":"ファイル情報","attribute_type":"file","attribute_value_mlt":[{"accessrole":"open_date","date":[{"dateType":"Available","dateValue":"1994-03-01"}],"displaytype":"detail","filename":"KJ00000012789.pdf","filesize":[{"value":"1.9 MB"}],"format":"application/pdf","licensetype":"license_6","mimetype":"application/pdf","url":{"label":"KJ00000012789","url":"https://nipr.repo.nii.ac.jp/record/2236/files/KJ00000012789.pdf"},"version_id":"7bdcdb9b-64ae-4423-acf9-fa95ce1bafe8"}]},"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":"departmental bulletin paper","resourceuri":"http://purl.org/coar/resource_type/c_6501"}]},"item_title":"Effect of a heated drilling bit and borehole liquid on thermoelastic stresses in an ice core","item_titles":{"attribute_name":"タイトル","attribute_value_mlt":[{"subitem_title":"Effect of a heated drilling bit and borehole liquid on thermoelastic stresses in an ice core","subitem_title_language":"en"}]},"item_type_id":"1","owner":"4","path":["403"],"pubdate":{"attribute_name":"公開日","attribute_value":"1994-03-01"},"publish_date":"1994-03-01","publish_status":"0","recid":"2236","relation_version_is_last":true,"title":["Effect of a heated drilling bit and borehole liquid on thermoelastic stresses in an ice core"],"weko_creator_id":"4","weko_shared_id":4},"updated":"2023-07-25T13:40:05.472284+00:00"}