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元鼎 前116年—前111年 政权 西汉 君主 汉武帝刘彻 历时 6年 元鼎在西汉及汉武帝时期的位置 元鼎 （元年：前116年 - 末年：前111年）是汉武帝的第五个年号。汉朝使用元鼎这个年号一共六年。 目录 1 源由 2 改元原由及年號問題 3 大事记 4 出生 5 逝世 6 纪年 7 参看 8 参考文献 源由 《漢書·武帝紀》：「元鼎四年六月，得寶鼎后土祠旁。」 改元原由及年號問題 《史记》卷十二《孝武本纪》：「其後三年，有司言元宜以天瑞命，不宜以一二数。一元曰建元，二元以长星曰元光，三元以郊得一角兽曰元狩云。」從宋代劉攽《兩漢刊誤》、司馬光《資治通鑑》，认为元鼎四年得宝鼎，是元鼎年号的来历。也因此推断元鼎才是年号的开始，之前的年号都是追加的。辛德勇認為當時以一、二、三、四數紀元，太初元年以前，現實生活中一直沒有正式採用以年號紀元的方式。現今目前的观点认为建元确是第一个年号。 大事记 元鼎六年，分桂陽郡而置零陵郡。 出生 逝世 纪年 元鼎 元年 二年 三年 四年 五年 六年 公元 前116年 前115年 前114年 前113年 前112年 前111年 干支 乙丑 丙寅 丁卯 戊辰 己巳 庚午 参看 中国年号索引 参考文献 李崇智，《中国历代年号考》，中华书局，2004年12月 ISBN 7101025129 辛德勇，《建元與改元：西漢新莽年號研究》，中華書局，2013年 前一年號： 元狩 中国年号 下一年號： 元封 查 论 编 汉武帝年号 漢武帝 建元 → 元光 → 元朔 → 元狩 → 元鼎 → 元封 → 太初 → 天漢 → 太始 → 征和 → 後元 漢朝其他年號 ：汉新年号 This page is only for reference, If you need detailed information, please check here

Adrian Peterson lined up at halfback A halfback ( HB ) is an offensive position in American football, whose duties involve lining up in the backfield [1] and carrying the ball on most rushing plays, i.e. a running back. When the principal ball carrier lines up deep in the backfield, and especially when that player is placed behind another player (usually a blocking back), as in the I formation, that player is instead referred to as a tailback (see History below). [2] [3] The halfback position is one of the more glamorous positions on the field, and is commonly viewed as a requirement for a team's success. [4] Sometimes the halfback can catch the ball from the backfield on short passing plays as he is an eligible receiver. Occasionally, they line up as additional wide receivers. When not running or catching the ball, the primary responsibility of a halfback is to aid the offensive linemen in blocking, either to protect the quarterback or another player carrying the foo...

Byrrhidae Byrrhus pilula Scientific classification Kingdom: Animalia Phylum: Arthropoda Class: Insecta Order: Coleoptera Suborder: Polyphaga Infraorder: Elateriformia Superfamily: Byrrhoidea Family: Byrrhidae Latreille, 1804 Subfamilies Amphicyrtinae Byrrhinae Syncalyptinae Byrrhidae , the pill beetles , is a family of beetles in the superfamily Byrrhoidea. These beetles are common in the forests of the Northern Hemisphere. They feed mainly on moss. Populations increase after wildfires. [1] There are about 450 species in this family. [2] Genera include: [3] Amphycyrta Arctobyrrhus Byrrhus Chaetophora Curimopsis Cytilus Eusomalia Exomella Lioligus Lioon Listemus Morychus Porcinolus Sierraclava Simplocaria References ^ Phillips, I. D., Cobb, T. P., & Spence, J. R. (2008). Salvage logging and edge effects on pill beetle abundance (Coleoptera: Byrrhidae). The Coleopterists Bu...

H.265 / HEVC Developed by MPEG, VCEG Type of format Video compression format Extended from H.264/MPEG-4 AVC Standards ISO/IEC 23008–2 , ITU-T H.265 Open format? No Website http://hevc.info High Efficiency Video Coding ( HEVC ), also known as H.265 and MPEG-H Part 2 , is a video compression standard, one of several potential successors to the widely used AVC (H.264 or MPEG-4 Part 10). In comparison to AVC, HEVC offers about double the data compression ratio at the same level of video quality, or substantially improved video quality at the same bit rate. It supports resolutions up to 8192×4320, including 8K UHD. Contents 1 Concept 2 History 2.1 Previous work 2.2 Standardization 2.3 Patent licensing 2.4 Versions 2.5 Implementations and products 2.5.1 2012 2.5.2 2013 2.5.3 2014 2.5.4 2015 2.5.5 2016 2.5.6 2017 2.5.7 2018 3 Coding efficiency 4 Features 4.1 Video coding layer ...