mid-year population 中文意思是什麼

mid-year population 解釋
年中人口
  • mid : adj. （superl. midmost ）1. 中央的，中部的，中間的〈常構成復合詞〉。2. 【語言學】央母音的，半開母音的。mid2, 'mid〈詩〉＝ amid.
  • year : n 1 年，歲；一年。2 年度，學年。3 〈pl 〉年紀，年齡，歲數；〈pl 〉老年。 ★在表示歲數時， years 略...
  • population : n. 1. 人口；人口總數；全體居民；人口的聚居。2. 物的全體[總數]；【生物學】蟲口；種群（量）；群體；族，組，個數；【統計學】對象總體，全域。3. 【物理學】布居；密度。4. 〈罕用語〉殖民。
  1. Twenty f1 combinations crossed among 5 varieties and strains different in fiber properties according to complete diallel crossing design were used to evaluate the heterosis and gene action of boll weight and lint percentage in high quality fiber property varieties in upland cotton in 1998 1999 for two year successively at nanjing. it was indicated that there existed small interactions with the environmental factors without maternal effects and the additive gene effect was in chief, attaining to 51. 2 % and 65. 4 % respectively for boll weight and lint percentage. the dominant effect was also in higher rate, 32. 6 % and 16. 8 % respectively. the population mean heterosis of boll weight and lint percentage over the mid - parental mean were relatively prominent 13. 3 % and 3. 5 % respectively in extreme significance. however, boll weight showed no significantly surpassing parental f1 heterosis over the better parent based on population mean ( 2. 0 % ) ; while the lint percentage expressed significant negative heterosis value ( - 2. 1 % ). the gene actions were in conformity with the heterosis expression. it was shown clearly that the f1 combinations crossed between parents with similar performances had relatively high dominant effects and significant positive f1 surpassing parental heterosis ( f1 heterosis over the better parent ) ; while no f1 combination crossed between the parents with prominent mutual difference surpassed the higher parent in yield components, which indicated that among those parents with less difference and close relationships, there still existed sufficient genetic variation or certain mechanism for creating variation and achieving greater advances in breeding. correlation analyses also indicated that there still existed severely undesirable negative correlation between yield and fiber properties as well as the difficulties for their simultaneous improvements

    利用5個具有不同纖維品質性狀的品種（系）配製完全雙列雜交組合20個，通過親本和f1的2年隨機區組試驗發現產量性狀的鈴重和衣分與環境的互作效應小，不存在母體效應，並以加性遺傳效應為主，分別占表型方差的51 . 2 %和65 . 4 % ;顯性遺傳效應所佔的比率也較高，分別為32 . 6 %和16 . 8 % .鈴重和衣分的群體平均優勢較大，分別為13 . 3 %和3 . 5 % ，達到了極顯著;鈴重的超親優勢為2 . 0 % ，不顯著;衣分為顯著的負值（ - 2 . 1 % ） .遺傳分析與雜種優勢結果一致.具體表現在產量性狀上，親本相當配製的組合雜合顯性較高，其超親優勢正向顯著，而極值親本（差異較大）所配組合沒有超過高親的.這表明親本差異小、親源關系較近的親本中仍然存在足夠的遺傳變異或某種機制以創造變異使育種取得更大的進展.相關分析表明了仍然存在嚴重的品質與產量的負相關，遺傳改良的難度較大
  2. The birth, death and natural increase figures in the frequently asked statistics section are compiled using known births and known deaths. birth rate and death rate are calculated by relating the known births and the known deaths in a year to their corresponding mid - year population

    載于常用統計資料部分的出生、死亡及自然增長數字是使用所知活產嬰兒數目和所知死亡人數編制。出生率及死亡率，是以一年內出生及死亡的所知人數，分別與同年年中的人口數字為分母構成比率。
  3. Mid - year population 000 s

    年中人口以千計
  4. As for the revised mid - year population estimates for 2001, they will be released in accordance with the usual release schedule, that is, in february 2002

    而二零零一年年中的人口估計修訂數字，則根據沿用的時間表發放，即於二零零二年二月公布。
  5. E estimated population mid - year in thousands

    E人口估計年中以千計
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