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multiple factors 【生物學】多對因子;多基因。

multiple fruit

As our experience and practice of agricultural industrialization in the past over ten years shows , the development of agricultural industrialization is restricted by multiple factors , esp ecially the want of fund , which has seriously checked the advance of agricultural industrialization 然而,十多年的農業產業化發展實踐經驗也同時告訴我們,農業產業化的發展,也存在著多方面的制約因素,其中,農業發展中的資金短缺問題尤其突出,它已嚴重制約了當前我國農業產業化進一步快速發展。

Following , making development study from the three directions : the first one is how to reduce calculation when to use markowitz model . this text has improved the efficient frontier of markowitz model utilizing free risk assets , and reduced calculation about revenue rates “ co - variance matrix utilizing single or multiple factors , and so on . the second one is to add thinking factors about , such as transaction fee , fund limitation , lowest transaction unit ' s limitation , risk measures and exchange rate risk of international portfolio securities , so as to make markowitz model closer to our country ' s practice 接著,分三今方向對markowitz模型進行了拓展研究:第一個方向是運用markowitz模型時如何減少計算量,本文利用無風險資產來改進markowitz模型的有效邊界,利用單因子或多因子模型來減少收益率協方差的計算量等等;第二個方向是增加考慮因素,諸如交易費用、資金限制、最小交易單位限制,風險測度和國際組合證券的匯率風險,使markowitz模型更貼近我國的實際;第三個方向是對markowitz模型進行動態拓展研究,提出了將證券收益率看成是隨機序列時的投資決策模型,深入研究了m ? v有效邊界隨資產品種數增加而發生的漂移,并用解析方法和幾何圖形描述了漂移的軌跡和方向。

Education is a complex open system under the influence of multiple factors that work together . its harmonious development is characteristic of being comprehensive , co - relative , and practical ; and , its influence upon economic growth is gradual and unbalanced in the sense of time , space and amount , considering its many inputs , variables and targets 教育本身是復雜、多因素相互作用的開放系統,其協調發展具有全局性、關聯性、綜合性和實踐性,對經濟增長的影響具有多級遞階,多輸入、多變量、多目標以及在時間、空間、數量上具有不均衡性。

Further more , through the investigations and analyses for the process and treatment of some typical accidents of soil nailing , including the one occurred in soft soil foundation pit , the one induced by the action of water , the one happened in composite soil nailing , and the one caused by multiple factors , it is shown that the incorrect exploration , design , construction and the action of water to soil are the main factors leading to accidents of soil nailing 進而通過對基坑土釘支護工程的典型事故,如軟土基坑事故、水土作用事故、復合土釘支護事故以及綜合原因導致的基坑事故的發生、經過及處理措施進行詳細的分析,總結出不恰當的勘察、設計、施工以及水土作用等是導致基坑土釘支護事故的主要原因。

Based on the progress in rail manufacturing technology and the newest achievements in track research and design , this paper studies the selection of cut - length , quality and materials of rails for urban rail transit , and suggests that multiple factors should be considered , such as different line arrangements , vehicle and loads , rail transportation , construction and maintenance condition of trackwork , construction period , inestmen1 and maintenance costs , so as to make sure that rail type selection in urban rail transit can satisfy the requirements on safety , reliability , applicability , economy and pertinence 摘要根據鋼軌制造技術的發展并結合軌道研究和設計領域的最新成果,對城市軌道交通鋼軌定尺長度、鋼軌質量及鋼軌材質選擇進行分析和探討,并建議在鋼軌選型時,應全面考慮不同線路布置特點,車輛及荷載情況,運輸、施工及維修條件,建設工期,初期投資及運營成本要求等綜合因素,力求使每條城軌交通中的鋼軌選型方案在滿足安全可靠的基礎上,更具工程針對性和經濟適用性。

Abstract : making use of the method of regression analysis , an e xperimental study of multiple factors change have been made in batch vibrated fl uidized bed . the mathematical model is set up between the diameter of particle an d the technological parameter . the effect of technological parameter on granulati on is discussed 文摘:利用回歸分析方法在間歇操作的振動流化床中進行了多因素變化試驗研究,建立了顆粒直徑與工藝參數之間的數學模型,探討工藝參數對造粒的影響。

In this thesis , great efforts have been made , through the study of multiple factors such as governmental school , private school , library , publication , academic supporter and scholar - taped assistant , etc . , to present clearly the reason why confucianism , since 17th century , has converted form the focus on moral and ethic perfection to the systematic study of empirical knowledge 本文通過對此一期間的官學、私學、藏書、出版、學術贊助人、學者型幕僚等多重因素的研究,力圖清晰地展現從17世紀以后的儒學何以由注重道德倫理的完善轉向經驗性實證知識的系統研究。

As backwash is the key of renewing and keeping up the function of filter , so some factor optimization experiments of backwash have been done . the optimum operating parameters of air scour and water backwash of ceramics media are chosen by multiple factors experiments : qa = 15 l / s ? m2 , qw = 5 l / s ? m2 , t1 = 1min , t2 = 5min , t3 = 5min 經多組實驗正交分析結果后得出了涂鐵陶粒濾池反沖洗實驗的最佳參數組合:氣沖強度15l / s ? m2 ,水洗強度5l / s ? m2 ,單氣預沖1min ,氣水同時反沖洗5min ,單水漂洗5min 。

Also , the thesis calculate and analysis the transverse deflection of steel box girder deeply in multiple factors . firstly , the article introduced the calculative methods and theory of local stress and strain of bridge structure . then program software system of finite element method was introduced . after that , the influential factors to the calculatial result and their values were analysed and suggested 本文首先介紹了橋梁結構局部應力應變計算理論和方法,對有限元計算程序進行了介紹,然后分析了縱橫隔板設置、梁高及梁寬變化等因素對鋼箱梁橋面板在恒載作用下的橫向撓度的影響,并將這些計算結果進行對照分析,從而找出了影響橋面板橫向撓度的主要影響因素,并得出了相應的數值可供工程實踐參考。

Firstly , each single factor ( concrete carbonation , steel bar corrosion materials strength ) related the resisting forces of rc bridges is considered in this paper . then a resisting force model for multiple factors is created based on two types of steel bar corrosion : general and localized corrosion models 本文首先考慮混凝土碳化、鋼筋銹蝕、材料強度等單因素對橋梁結構抗力衰減的影響,然后在此基礎上建立多因素綜合作用下的結構抗力衰減模型。

To solve this problem , a new correlation algorithm - multiple factor synthetic decision algorithm ( mfsda ) is developed in the paper . in mfsda , besides the azimuth the high accurate attribute parameters from esm sensor is also considered as the precondition of attribute - track correlation 針對傳統的屬性關聯采用方位角一維信息進行關聯的不確定性和關聯正確率不高而提出一種新的多因素綜合評判法進行屬性關聯。

Abstract : in this paper , based on the quadratic general rotary unitized design , the experiments effected by multiple factors have been made on vibro - fluidized bed spray granulation . mathematical model has been established , and the optimum operating parameters are found out 文摘:研究了利用二次通用旋轉組合設計來進行多因素影響的振動流化床噴霧造粒試驗,建立數學模型,得出了具有一定參考價值的最佳操作參數。

A genetic algorithm is employed to choose the most effective navigation sources to save computing time and make sure of the real time feature from multiple factors for the reason of long processing time in navigation source selection 同時,在相對導航源選擇判據算法中,針對源選擇因素較多,處理時間長的特點,本文提出了采用遺傳算法進行源選擇以節省處理器計算時間的方法,保證了相對導航處理的實時性。

In sea waters of complicated dynamic factors , determination of the axial line of wharf over 200000t shall consider multiple factors including function of vessels on tile wharf , wharf workable days anti working efficiency , as well as berthing operation 摘要對20萬噸級以上、動力要素十分復雜的海域,碼頭軸線的確定需要考慮船舶對碼頭結構的作用、碼頭可作業天數及作業效率、航道引水靠泊作業等多種要素。

Occurrence of liver carcinoma is a synergistic action by multiple factors which include virus infection , carcinogen , oncogene activation , anti - oncogene inactivation , liver cell apoptosis , failure of proliferation regulation and so on 肝癌的發生是一個多因素協同作用的過程,這個過程中包括病毒感染、致癌物的作用、癌基因的激活和抑癌基因的失活、肝細胞的凋亡和增殖調節失控等多因素多環節。

Although many genetic mutations have been suggested as causes or risk factors for parkinson ' s disease , the low penetrance of some mutations and the low disease concordance in relatives suggests that there must be interactions between multiple factors 雖然許多遺傳突變已經被認為是帕金森氏病的危險因素,但是一些突變基因的外顯率低,家族相關的發病率也低,這說明一定有多因素的交互作用。

The mosaic theory states that multiple factors sustain elevated bp even though an aberration of only one was initially responsible ; eg , the interaction between the sympathetic nervous system and the renin - angiotensin - aldosterone system 鑲嵌理論認為,有多種因素使血壓維持在升高位置,盡管最初起作用的異常因素只有一個,如交感神經系統和腎素-血管緊張素-醛固酮之間的相互作用。

The dilemma of the confucianism is not the result from any single factor but of the combined action by multiple factors that include both the inherent ones of the confucianism and others of politics , economy and ideology 儒學思想的現代困境并不是某一單一因素的作用結果,而是多元因素的綜合作用所致。其中既有儒學內在系統的困境因素,更有政治、經濟、意識形態等多方面的原因。

An index is proposed and a solution is provided . for multiple factors uncertainties problems , signal - to - noise ratio is put forward . by test , optimization of input uncertainties can be found to make structural robust 提出了度量指標,給出了求解方法,并對多不確定因素提出了利用信噪比做為判別標準,通過正交試驗對輸入不確定因素進行優化,使得結構穩健可靠。