Extension and application of logistic curve 邏輯斯蒂曲線的幾個(gè)推廣模型與應(yīng)用
Logistic curve model application for chongqing urban inhabitant income forecasting 以重慶市城鎮(zhèn)居民收入預(yù)測為例
Study on application of logistic curve model to settlement prediction of roadbed subjected to multilevel loadings 增加曲線模型在路基沉降預(yù)測中的應(yīng)用研究
For the multistage loadings of embankment , the logistic curve model to embankment settlement predication is put forward by error analyses and comparisons 通過誤差分析與比較,把增長曲線模型引入到多級(jí)荷載下的路堤沉降預(yù)測中。
In order to test the grade criterions of flood disaster loss , logistic curve ( log ) model and genetic algorithm ( ga ) are used by the author who properly disposes the judge of disaster loss grade 為檢驗(yàn)洪澇災(zāi)情等級(jí)標(biāo)準(zhǔn)的合理性,筆者利用邏輯斯諦曲線和遺傳算法對其加以驗(yàn)證,并且在模型的級(jí)別判定上,做了適當(dāng)?shù)奶幚怼?
It was found out that the prevalence of tobacco brown spot disease alternaria alternata ( fr . ) keissler presented growth with logistic curve pattern , and the degree of disease fluctuated greatly among different years in the tobacco region of hunan 摘要通過在湖南主產(chǎn)煙區(qū)5點(diǎn)16年次以上系統(tǒng)調(diào)查,發(fā)現(xiàn)赤星病季節(jié)流行呈邏輯斯蒂曲線增長,發(fā)病程度年間波動(dòng)大。
Because the water resources are affect by enforcing element and constraining elelment together in the exploration and utilization logistic curve is used similarly to relate the increasing process of low flow carrying capacity and describe expressional forms of low flow in diffrernt stages 由于水資源在開發(fā)利用中,受到增強(qiáng)因子和約束因子的共同作用,所以近似地用生態(tài)學(xué)中l(wèi)ogistic曲線來描述枯水資源承載力的增長過程,同時(shí)用不同的數(shù)學(xué)模型表達(dá)枯水資源承載力在不同階段的表現(xiàn)形式。
The indirect use value is rmb 819 . 60 million yuan ( us $ 102 . 44 million ) . the current non - use value is rmb 1 . 75 billion yuan ( us $ 0 . 22 billion ) . the paper evaluates the present situation of water environment quality in wuliangsuhai lake and gains its level of the water quality though investigation , monitoring and analysis in from 2003 to 2005 and using of the logistic curve model 評(píng)估結(jié)果表明烏梁素海濕地的總價(jià)值為28 . 24 108元,其中直接實(shí)物產(chǎn)品價(jià)值為7164 . 70 104元,直接非實(shí)物服務(wù)價(jià)值為18193 . 43 104元,間接價(jià)值為81960 . 58 104元,目前非使用類價(jià)值為17 . 51 108元。