population mean 中文意思是什麼

population mean 解釋
人口平均數
  • 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。
  • mean : vt 1 意，有…的意思，意思是…。2 意指，用…意思說；意味著，就是。3 （用語言、繪畫等）表示意思，表示...
  1. Rapd ( random amplified polymorphic dna ) technique was used to study the genetic structure and genetic differentiation of the natural population and the hatchery stock of chlamys farreri. amplifications with 20 10 - base primers under predetermined optimal reaction yielded 153 reproducible amplified fragments ranging from 200 to 3000bp. the mean proportions of polymorphic amplified fragments of natural population and the hatchery stock were 73. 2 % and 70. 6 % respectively, and the mean hetreozygosities of them were 0. 27 and 0. 26 respectively

    在對20個野生櫛孔扇貝和20個養殖櫛孔扇貝的基因組dna的檢測中， 20個隨機引物共擴增出153條清晰可分辨的dna片段，片段大小在200 3000bp之間，其中野生種群和養殖群體多態性片段分別為112和108條，多態位點比例分別為73 . 2 %和70 . 6 % ，雜合度分別為0 . 27和0 . 26 。
  2. The mean effective population size could be estimated as a harmonic means of the ne.

    估計出平均有效種群大小，作為所有世代Ne的調和平均值。
  3. The mean effective population size could be estimated as a harmonic means of the ne

    估計出平均有效種群大小，作為所有世代ne的調和平均值。
  4. The mean of a normally distributed population lies at the center of its normal curve.

    正態分佈總體的平均數在正態曲線的中心。
  5. Animals adapt to changing conditions, which might mean a shift in population patterns to areas where pack ice is morerobust year - round

    動物會適應變化的條件，這意味著它們的數量會轉移到更加結實的冰蓋上去。
  6. Endophytic bacteria were recovered in tobacco roots at mean population densities ranging from 2. 0xl04to 1. 0xl08cfu / g - fw

    煙草整個生育期內生細菌種群密度：根中2
  7. 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
  8. Then, with the concept of accumulated failure probability, the proposed approach combines the least ? quares method with bayes " theorem, takes advantage of the parameter estimation for single weibull distribution to each derived subgroup data set, and estimates the parameters of each subpopulation. the estimates given by this paper also satisfy the maximum likelihood equation. the mean time to failure and the reliability estimation of the mixed population are given

    然後通過利用累積失效概率等概念，對每個導出的子組數據集聯合運用最小二乘法、貝葉斯定理和對單一威布爾分佈的參數估計法，從而得到每個子總體的滿足極大似然原理的參數估計，給出了該混合總體平均壽命和可靠度的估計。
  9. The normal population characteristics, such as the mean, standard deviation, percentile, percentage and coefficient of variation, are often tested in engineering

    摘要正態母體特徵值（母體均值、百分位值、百分率、標準差和變異系數等）的檢驗是工程中常見的問題。
  10. Was the best bacterial indicator for assessing the incidence of diseases associated with swimming in the local population. they also established a significant linear relationship between the geometric mean of

    研究結果很明確，顯示大腸桿菌是評估香港市民因游泳而感染疾病病發率的最佳指標，此外研究亦確定大腸桿菌含量的幾何平均值與游泳引致的腸胃病和其它疾病的發病率有直接的關系。
  11. The imf is of the view that, in the absence of any policy change or reform, the levels of reserves needed to anticipate fluctuations in revenue could be around 30 to 50 per cent of gdp, while those aimed at anticipating fiscal pressures arising from population ageing could mean putting in an additional 30 per cent of gdp by 2030

    基金組織認為，假如沒有任何政策轉變或改革，香港的理想儲備水平應該維持在相等於本地生產總值百分之三十至五十，以應付收入波動而在二三年則額外需要相等於本地生產總值百分之三十的儲備，以應付人口老化所帶來的財政壓力。
  12. A modified genetic algorithm ( mga ) framework was developed and applied to the flowshop sequencing problems with objective of minimizing mean total flowtime. to improve the general genetic algorithm routine, two operations were introduced into the framework. firstly, the worst points were filtered off in each generation and replaced with the best individuals found in previous generations ; secondly, the most promising individual was selectively cultivating if a certain number of recent generations have not been improved yet. under conditions of flowshop machine, the initial population generation and crossover function can also be improved when the mga framework is implemented. computational experiments with random samples show that the mga is superior to general genetic algorithm in performance and comparable to special - purpose heuristic algorithms. the mga framework can also be easily extended to other optimizations even though it will be implemented differently in detail

    提出了一個改進遺傳演算法的結構，並且應用於帶有目標是最小平均總流程時間的流水調度排序中.為了改進一般遺傳演算法的程序，兩個新的操作被引進到這個操作中.這兩個操作為： 1 ）過濾操作：過濾掉在每一代中的最壞的個體，用前一代中的最好的個體替代它； 2 ）培育操作：當在一定代數內演算法不改進時，選擇一個培育操作用於培育最有希望的個體.通過大量的隨機產生的問題的例子的計算機實驗顯示出，提出的演算法的性能明顯好於一般遺傳演算法，並且和此問題的最好的專門意義的啟發式演算法相匹配.新的mga框架很容易擴展到其它最優化當中，只是實施的詳細的步驟有所不同
  13. Abstract : the generalized shrunken prediction of finite population is introduced, using generalized shrunken least squares estimator of linear regression models. with respect to prediction mean squared error, a necessary and sufficient condition for superiority of a generalized shrunken prediction over the best linear unbiased prediction is obtained. in the case of linear combination of every unit index, a linear restricting prediction is introduced and then a necessary and sufficient condition for superiority of linear restricting prediction over the best linear unbiased prediction is devived

    文摘:利用線性回歸模型的廣義壓縮最小二乘估計，引入了有限總體的廣義壓縮型預測，在預測均方誤差意義下，得到了廣義壓縮型預測優于最佳線性無偏預測的一個充分必要條件；在只能得到每個個體指標的線性組合時，引入了一種線性約束型預測，並得到了線性約束型預測優于最佳線性無偏預測的一個充分必要條件
  14. Low rainfall and high population density mean the south east of england has less water per head than sudan. it ' s a crisis, there ' s no question about that, " said peter ainsworth, the conservatives " shadow environment secretary

    一些機構和人士還建議在英國實施北水南調工程，將降水較多地區的河水逐步引入降水相對較少的東南部地區，以緩解那裡的「水危機」 。
  15. The results showed that : 115 polymorphic loci from yuzong 5 and gold queen maize population were amplified by 40 ssr primers ; the genotypic number accumulated by 40 primer amplification were 196 for yuzong 5 and 194 for gold queen ; the mean genetic distances were 0. 3834 for yuzong 5 and 0. 3397 for gold queen ; the mean observed heterozygosity was 0. 3826 for yuzong 5 and 0. 3292 for gold queen, while their mean anticipant heterozygosity was 0. 4747 and 0. 4143, respectively

    結果表明： 40對引物在兩群體中都擴增出115個多態位點；累加40對引物擴增的基因型種類，豫綜5號196種，金皇后194種；豫綜5號的平均遺傳距離為0 . 3834 ，金皇后綜合種為0 . 3397 ；豫綜5號的平均觀察雜合度是0 . 3826 ，平均期望雜合度是0 . 4747 ；金皇后綜合種的平均觀察雜合度是0 . 3292 ，平均期望雜合度是0 . 4143 。
  16. The higher landscape heterogeneity, the closer to nature secondary forest. along the gradient, landscape congregation index exhibits descendent tendency, showing a significant relationship between the extent of patch mosaic and the extent of disturbance, according to changes of landscape mean shape index ( lmsi ) and landscape mean fractal dimension index, integrated disturbance ( nature disturbance, human activities, vegetational inner succession or population dynamics ) tend to enhance

    景觀聚集度指數是隨著梯度區呈下降的變化趨勢，表明斑塊之間的鑲嵌聯系的程度與受到的干擾程度有極為重要的關系。從景觀平均形狀指數和景觀平均分維數的變化，可看出綜合干擾（自然干擾、人為活動、植被的內源演替或種群的動態變化）是呈增強的發展趨勢。
  17. Testing of multi - dimensional normal population with mean zero

    多維正態總體零均值的假設檢驗
  18. Cities are increasing there population and urbanization process, at the mean while family members are decreasing but mobilities

    城市人口密集，城市化進程進一步加快，家庭人口數目相對減少，人口流動性增大。
  19. Improving methods to calculate estimator minimum variance of the finite population mean

    總體均值估計量最小方差的改進
  20. The school of public health and the food and nutritional sciences programme of the chinese university of hong kong have initiated a series of studies looking into the health effects of soy and the intake profile in the population. mean soy protein intake in the hong kong chinese population is around 6 - 8 grams per day, with a range from about a mean intake of 2 grams per day in the low quartile intake group, to 18 gram per day in the high quartile intake group

    香港中文大學公共衛生學院及食物及營養科學系曾進行一系列關于大豆攝取量及其對健康的影響的本地研究；香港人平均每日大豆蛋白攝取量約為六至八克，由最低平均每日二克至最高平均每日十八克。
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