{"created":"2021-03-01T06:43:23.004991+00:00","id":25425,"links":{},"metadata":{"_buckets":{"deposit":"3431c250-a7dc-43a1-bf4d-f214d1ef77ad"},"_deposit":{"id":"25425","owners":[],"pid":{"revision_id":0,"type":"depid","value":"25425"},"status":"published"},"_oai":{"id":"oai:repository.dl.itc.u-tokyo.ac.jp:00025425","sets":["27:2466:2467:2549","9:504:2469:2550"]},"item_4_alternative_title_1":{"attribute_name":"その他のタイトル","attribute_value_mlt":[{"subitem_alternative_title":"Measurement of the Properties of Standing Trees with Ultrasonics and Mapping of the Properties"}]},"item_4_biblio_info_7":{"attribute_name":"書誌情報","attribute_value_mlt":[{"bibliographicIssueDates":{"bibliographicIssueDate":"1996","bibliographicIssueDateType":"Issued"},"bibliographicPageEnd":"135","bibliographicPageStart":"125","bibliographicVolumeNumber":"96","bibliographic_titles":[{"bibliographic_title":"東京大学農学部演習林報告"}]}]},"item_4_description_5":{"attribute_name":"抄録","attribute_value_mlt":[{"subitem_description":"トドマツ，カラマツ立木に関し，超音波により材質測定を行ってきた結果，以下のことが明らかになった。（1）いくつかの林分について，超音波伝播速度を用いて算出された見かけのヤング係数により，材質の差，および林齢の違いによる材質の変化の傾向が確認された。（2）超音波伝播速度の2乗と各試験体の見かけの密度を用いて算出した見かけのヤング係数との関係について，原点を通る直線で単回帰分析を行った結果，決定係数が高かった。このことにより，それぞれの林分における見かけの密度は，ほぼ一定と見なせることができた。また，それぞれの回帰係数より各林分の見かけの密度が推定できた。（3）超音波伝播速度は，立木の材質に関する新たな指標と考えることができた。すなわち，超音波の伝播速度を用いても，スギ立木に関し，打撃法による応力波を用いた，我々の既報の測定と等価な結果が得られることが判明した。（4）カラマツ雑種においては，立木の状態で見かけのヤング係数について，家系間の差異が認められた。（5）見かけのヤング係数と成長の指標である胸高直径，樹高との間の関係については，今後のデータの蓄積が必要である。（6）今回の方法を用いれば，森林内における立木の材質マップを得ることができ，地形等の環境と材質の関係を調べる上で，また素材生産を行う上で，有力な情報となると考えられる。","subitem_description_type":"Abstract"},{"subitem_description":"The MOE (Modulus of Elasticity) of standing trees was measured with ultrasonics. The species were Todo-fir (Abies sachalinesis) and Larch (Larix leptolepis). The results are summarized as follows: (1) There were differences between the values of the MOE for certain forest stands at different locations and of different ages. (2) A simple linear regression line between the squares of the propagation velocities (v) of ultrasonics and the MOE which passes the origin produced a relatively large coefficient determination for each forest stand. Thus the density, calculated from the regression coefficient, for each forest stand could be estimated as a constant value. (3) A similar trend for the MOE was obtained from the velocity v of ultrasonics. Thus, v could be used instead of the MOE as an index for the properties of standing trees. The same results were obtained for standing Sugi (Cryptomeria japonica) where stress waves produced by the hitting method were used, as reported in a previous paper. (4) Differences in the MOE were recognized between families in hybrid larch. (5) More data are needed to clarify the relationships between the diameters at breast height, tree heights and the MOE. (6) Maps of the MOE for standing trees in forest stands could be made by means of the estimated density. Such maps could provide very useful information for bucking and timber production.","subitem_description_type":"Abstract"}]},"item_4_full_name_3":{"attribute_name":"著者別名","attribute_value_mlt":[{"nameIdentifiers":[{"nameIdentifier":"54660","nameIdentifierScheme":"WEKO"}],"names":[{"name":"NAKAMURA, Noboru"}]}]},"item_4_publisher_20":{"attribute_name":"出版者","attribute_value_mlt":[{"subitem_publisher":"東京大学大学院農学生命科学研究科附属演習林"}]},"item_4_source_id_10":{"attribute_name":"書誌レコードID","attribute_value_mlt":[{"subitem_source_identifier":"AN00162451","subitem_source_identifier_type":"NCID"}]},"item_4_source_id_8":{"attribute_name":"ISSN","attribute_value_mlt":[{"subitem_source_identifier":"03716007","subitem_source_identifier_type":"ISSN"}]},"item_4_subject_15":{"attribute_name":"日本十進分類法","attribute_value_mlt":[{"subitem_subject":"610","subitem_subject_scheme":"NDC"}]},"item_4_text_21":{"attribute_name":"出版者別名","attribute_value_mlt":[{"subitem_text_value":"The Tokyo University Forests"}]},"item_4_text_4":{"attribute_name":"著者所属","attribute_value_mlt":[{"subitem_text_value":"東京大学農学部附属演習林北海道演習林"},{"subitem_text_value":"University Forest in Hokkaido, Faculty of Agriculture, The University of Tokyo"}]},"item_creator":{"attribute_name":"著者","attribute_type":"creator","attribute_value_mlt":[{"creatorNames":[{"creatorName":"中村, 昇"}],"nameIdentifiers":[{"nameIdentifier":"54659","nameIdentifierScheme":"WEKO"}]}]},"item_files":{"attribute_name":"ファイル情報","attribute_type":"file","attribute_value_mlt":[{"accessrole":"open_date","date":[{"dateType":"Available","dateValue":"2017-06-09"}],"displaytype":"detail","filename":"esrh096006.pdf","filesize":[{"value":"824.1 kB"}],"format":"application/pdf","licensetype":"license_note","mimetype":"application/pdf","url":{"label":"esrh096006.pdf","url":"https://repository.dl.itc.u-tokyo.ac.jp/record/25425/files/esrh096006.pdf"},"version_id":"255379ff-2aa3-4f0a-9b07-adfb8fffb52f"}]},"item_keyword":{"attribute_name":"キーワード","attribute_value_mlt":[{"subitem_subject":"超音波","subitem_subject_scheme":"Other"},{"subitem_subject":"超音波伝播速度","subitem_subject_scheme":"Other"},{"subitem_subject":"立木","subitem_subject_scheme":"Other"},{"subitem_subject":"ヤング係数","subitem_subject_scheme":"Other"},{"subitem_subject":"立木材質マップ","subitem_subject_scheme":"Other"},{"subitem_subject":"Ultrasonics","subitem_subject_scheme":"Other"},{"subitem_subject":"Velocities of ultrasonics","subitem_subject_scheme":"Other"},{"subitem_subject":"Standing trees","subitem_subject_scheme":"Other"},{"subitem_subject":"Modulus of Elasticity","subitem_subject_scheme":"Other"},{"subitem_subject":"Property maps of standing trees","subitem_subject_scheme":"Other"}]},"item_language":{"attribute_name":"言語","attribute_value_mlt":[{"subitem_language":"jpn"}]},"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":"超音波による立木の材質測定と立木材質マップの作成","item_titles":{"attribute_name":"タイトル","attribute_value_mlt":[{"subitem_title":"超音波による立木の材質測定と立木材質マップの作成"}]},"item_type_id":"4","owner":"1","path":["2550","2549"],"pubdate":{"attribute_name":"公開日","attribute_value":"2014-09-03"},"publish_date":"2014-09-03","publish_status":"0","recid":"25425","relation_version_is_last":true,"title":["超音波による立木の材質測定と立木材質マップの作成"],"weko_creator_id":"1","weko_shared_id":null},"updated":"2022-12-19T04:59:54.323737+00:00"}