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By analyzing the influence of these factors on the crown contact-phenomenon, we introduced the formulas to estimate the maximum resisting force and work done when a cut tree crown passes through the crown of standing trees. Since the resisting force is essentially and mainly based on the bending force of each branch, the maximum resisting force F_m is derived from the branch bending force as F_m = \u03b7(1\uff0b\u03bc)f_bmwhere f_bm is the maximum force which will be caused by bent branches during the crown contact, and \u03b7 and \u03bc are the branch contact efficiency and frictional coefficient between two crowns, respectively. In the same manner, the work done W_t can be expressed as W_t = \u03b7(1\uff0b\u03bc)w_bt where w_bt is the total bending work of all branches involved in the contact.", "subitem_description_type": "Abstract"}]}, "item_9_description_5": {"attribute_name": "\u5185\u5bb9\u8a18\u8ff0", "attribute_value_mlt": [{"subitem_description": "\u8fb2\u6797\u6c34\u7523\u7814\u7a76\u60c5\u5831\u30bb\u30f3\u30bf\u30fc\u3067\u4f5c\u6210\u3057\u305fPDF\u30d5\u30a1\u30a4\u30eb\u3092\u4f7f\u7528\u3057\u3066\u3044\u308b\u3002", "subitem_description_type": "Other"}]}, "item_9_identifier_60": {"attribute_name": "URI", "attribute_value_mlt": [{"subitem_identifier_type": "HDL", "subitem_identifier_uri": "http://hdl.handle.net/2237/8723"}]}, "item_9_identifier_registration": {"attribute_name": "ID\u767b\u9332", "attribute_value_mlt": [{"subitem_identifier_reg_text": "10.18999/bulnuf.15.69", "subitem_identifier_reg_type": "JaLC"}]}, "item_9_publisher_32": {"attribute_name": "\u51fa\u7248\u8005", 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