「空飛ぶ宝石」の異名をとるカワセミは、その美しい体を一直線に伸ばし、時速100kmものスピードで獲物の魚めがけて水中に飛び込む。水しぶきすらほとんど上げず弾丸のようにダイブするカワセミのくちばしは、水や空気の抵抗を減らすために鋭い四角すいの形をしている。この形状は、研究者がコンピュータを駆使して計算しやっとたどり着いた最も抵抗の少ない形とピタリと一致していた。長い長い進化の歴史の中で、カワセミは飛び込みに最も適したくちばしを手に入れていた。
新幹線の先端をカワセミのくちばしに似た形状にすることで、走行抵抗を30％減らし、また、トンネルと通る時に発生する騒音を解決することに成功している。
高速で走る乗り物の空気抵抗を減らすヒントになる。
| Query | Error | Affected | Num. rows | Took (ms) | Actions |
|---|---|---|---|---|---|
| SELECT `Content`.`id`, `Content`.`user_id`, `Content`.`last_edit_user_id`, `Content`.`post_date`, `Content`.`post_date_year`, `Content`.`post_date_month`, `Content`.`post_date_day`, `Content`.`title`, `Content`.`title_en`, `Content`.`content`, `Content`.`plain_content`, `Content`.`page_view`, `Content`.`flag`, `Content`.`mod_count`, `Content`.`created`, `Content`.`modified` FROM `contents` AS `Content` WHERE `id` = 186 LIMIT 1 | 1 | 1 | 0 | ||
| SELECT `Attachment`.`file_name`, `Attachment`.`dir`, `Attachment`.`model`, `Attachment`.`foreign_key` FROM `attachments` AS `Attachment` WHERE `file_name` <> 'default.jpg' AND `Attachment`.`foreign_key` = (186) | 1 | 1 | 0 | ||
| SELECT `ContentsRelatedItem`.`content`, `ContentsRelatedItem`.`related_item_id`, `ContentsRelatedItem`.`content_id` FROM `contents_related_items` AS `ContentsRelatedItem` WHERE `ContentsRelatedItem`.`content_id` = (186) | 10 | 10 | 0 | ||
| SELECT `RelatedItem`.`code`, `RelatedItem`.`name` FROM `related_items` AS `RelatedItem` WHERE `RelatedItem`.`id` = 1 | 1 | 1 | 0 | ||
| SELECT `RelatedItem`.`code`, `RelatedItem`.`name` FROM `related_items` AS `RelatedItem` WHERE `RelatedItem`.`id` = 2 | 1 | 1 | 0 | ||
| SELECT `RelatedItem`.`code`, `RelatedItem`.`name` FROM `related_items` AS `RelatedItem` WHERE `RelatedItem`.`id` = 4 | 1 | 1 | 0 | ||
| SELECT `RelatedItem`.`code`, `RelatedItem`.`name` FROM `related_items` AS `RelatedItem` WHERE `RelatedItem`.`id` = 6 | 1 | 1 | 0 | ||
| SELECT `RelatedItem`.`code`, `RelatedItem`.`name` FROM `related_items` AS `RelatedItem` WHERE `RelatedItem`.`id` = 7 | 1 | 1 | 0 | ||
| SELECT `RelatedItem`.`code`, `RelatedItem`.`name` FROM `related_items` AS `RelatedItem` WHERE `RelatedItem`.`id` = 8 | 1 | 1 | 0 | ||
| SELECT `RelatedItem`.`code`, `RelatedItem`.`name` FROM `related_items` AS `RelatedItem` WHERE `RelatedItem`.`id` = 9 | 1 | 1 | 0 | ||
| SELECT `RelatedItem`.`code`, `RelatedItem`.`name` FROM `related_items` AS `RelatedItem` WHERE `RelatedItem`.`id` = 9 | 1 | 1 | 0 | ||
| SELECT `RelatedItem`.`code`, `RelatedItem`.`name` FROM `related_items` AS `RelatedItem` WHERE `RelatedItem`.`id` = 9 | 1 | 1 | 0 | ||
| SELECT `RelatedItem`.`code`, `RelatedItem`.`name` FROM `related_items` AS `RelatedItem` WHERE `RelatedItem`.`id` = 11 | 1 | 1 | 0 | ||
| SELECT `ContentsTag`.`id`, `ContentsTag`.`tag_group_id`, `ContentsTag`.`mod_count`, `ContentsTag`.`tag_id`, `ContentsTag`.`content_id` FROM `contents_tags` AS `ContentsTag` WHERE `ContentsTag`.`content_id` = (186) | 2 | 2 | 0 | ||
| SELECT `Tag`.`name`, `Tag`.`comment`, `Tag`.`tag_group_id` FROM `tags` AS `Tag` WHERE `Tag`.`id` = 55 | 1 | 1 | 0 | ||
| SELECT `TagGroup`.`code`, `TagGroup`.`name` FROM `tag_groups` AS `TagGroup` WHERE `TagGroup`.`id` = 5 | 1 | 1 | 0 | ||
| SELECT `Tag`.`name`, `Tag`.`comment`, `Tag`.`tag_group_id` FROM `tags` AS `Tag` WHERE `Tag`.`id` = 97 | 1 | 1 | 0 | ||
| SELECT `TagGroup`.`code`, `TagGroup`.`name` FROM `tag_groups` AS `TagGroup` WHERE `TagGroup`.`id` = 7 | 1 | 1 | 0 | ||
| SELECT `RelatedItem`.`id`, `RelatedItem`.`code`, `RelatedItem`.`name`, `RelatedItem`.`created`, `RelatedItem`.`modified`, `RelatedItem`.`flag` FROM `related_items` AS `RelatedItem` WHERE `code` = 'function' LIMIT 1 | 1 | 1 | 0 | ||
| SELECT `Content`.`id`, `Content`.`title`, `Content`.`title_en` FROM `contents` AS `Content` WHERE id = (NULL) ORDER BY `id` desc | 0 | 0 | 0 |
Peak Memory Use 8.70 MB
| Message | Memory use |
|---|---|
| Component intitailization | 6.76 MB |
| Controller action start | 6.82 MB |
| Controller render start | 6.89 MB |
| View render complete | 7.91 MB |
Total Request Time: 591 (ms)
| Message | Time in ms | Graph |
|---|---|---|
| Core Processing (Derived) | 245.56 | |
| Component initialization and startup | 19.63 | |
| Controller action | 37.83 | |
| Render Controller Action | 63.05 | |
| » Rendering View | 51.59 | |
| » » Rendering APP/views/contents/view.ctp | 32.31 | |
| » » Rendering APP/views/layouts/default.ctp | 17.63 | |
| » » » Rendering APP/views/elements/header.ctp | 1.48 | |
| » » » Rendering APP/views/elements/content_sidebar.ctp | 0.45 | |
| » » » Rendering APP/views/elements/footer.ctp | 0.40 |
