selection coefficient 中文意思是什麼

selection coefficient 解釋
選擇系數
  • selection : n. 1. 選擇；挑選；選拔。2. 拔萃；選擇物；精選物[品]；文選。3. 【無線電】分離，（自動電話）撥號。4. 【生物學】選擇，淘汰。
  • coefficient : adj. 共同作用的。n. 1. 共同作用；協同因素。2. 【數，物】系數，率；程度。
  1. The determination and reasonable selection of friction coefficient between belts for belt friction driving conveyor

    帶式摩擦驅動輸送機帶間摩擦系數的測定和合理選擇
  2. The relations between relative measurementerror resulting from temperature and heat distensibility coefficient of coil ’ s framework andwindingcoilwerecarriedout. theinfluenceofelectromagnetisminterferenceontheaccuracyof rogowski coil, as well as the effect of temperature on integraph, were studied. somemeasures based on the above investigating results were proposed to insure the precision ofrogowski coil sensor head, such as the selection of materials and facture methods, improvment of technics and design of additional compensation

    利用建立的rogowski線圈的數學模型對溫度和外界干擾磁場的影響進行了分析，得出了溫度造成的相對誤差與線圈骨架和繞組線圈熱膨脹系數之間的關系;從兩個方向上分析了干擾磁場對線圈精度的影響;分析了溫度對積分器的影響等。
  3. Specially, based on risk - metric and factor variables, the author discusses multi - factor asset pricing model. in theoretical analysis, the author attempts to release the assumption of index ' s random walk, proves a portfolio selection model suitable for the linear index level moreover, based on assets un - exchangeable, the author brings forward asset pricing models for b - shares, h - shares and non - circulated - shares. the author also brings forward multi - factor asset pricing model based on risk - metric indices, such as coefficient of beta, standard variance, standard semi - variance, average absolute deviation, value at risk, and factor variables, such as circulated market equity, exchange ratio, short - term historical return

    在理論分析時，作者嘗試放鬆指數水平滿足隨機遊走過程的假設，推導出指數水平呈線性趨勢的資產組合選擇模型；此外，作者基於資產不可交易這一假設，提出了b股、 h股和非流通股等情形的資產定價模型，並基於系數、標準差、標準半方差、平均絕對離差和風險價值等風險度量指標以及流通市值、換手率、短期歷史收益率等因素變量提出了四因素資產定價模型。
  4. This study was conducted to examine the interrelationship of 10 seed vigor traits in 12 wheat genotypes through variance, co - variance and path coefficient analysis, to determine broad - sense heritability, and to estimate genetic advance under selection. the genotypes showed significant difference for all traits, except for percentage of normal seedling. genetic correlation between conversion efficiency of seed reserve, electrical conductivity with other traits were not significant, showed that selection for any of them might be possible without hampering any other traits. however path coefficient analysis indicated that conversion efficiency of seed reserve, seed reserve utilization ratio have strong direct effect in affecting seedling weight, and that mean germination time has significantly negatively correlated in affecting gi. moderate to high estimates of broad - sense heritability, genetic coefficient of variation and expected genetic advance were obtained for electrical conductivity, germination index, mean germination time, seed dry weigh, seedling dry weigh, seed reserve depletion ratio indicating the possibility for improving these traits

    本研究利用12個普通小麥品種對10個種子活力性狀的遺傳變異和相關研究，表明除正常幼苗百分率外，其餘種子活力性狀在品種間均存在顯著的差異.種子貯藏物質轉換效率、電導率兩個性狀間及與其它性狀均無顯著的遺傳相關，因此對他們的選擇不會影響到其它性狀.通徑分析表明幼苗干重主要取決于種子貯藏物質轉換效率、種子貯藏物質利用速率;發芽指數主要由平均發芽時間決定.電導率、發芽勢、幼苗干重、種子干重、發芽指數、種子貯藏物質消耗比率6個性狀表現中到高的遺傳力、遺傳變異系數和相對遺傳進展，指明通過遺傳育種手段改良這些性狀是可能的
  5. The formula of selection index and mating combination were mainly made by two characters, daily gain and backfat, and inbreeding coefficient of offsprings, respectively

    其選擇指數公式的確立主要依據日增重，背膘厚這兩個主選性狀，選配計劃的制訂主要根據後代近交系數。
  6. From the view of engineering economies, this paper get objective function of equipment selection for ice - storage system, and get the optimal equipment selection, in which introduce into uniform annuity and correction coefficient of designing date load

    摘要從工程經濟學角度，引進等額年金，設計日負荷修正系數，得出冰蓄冷空調系統設備選擇的目標函數，對各參數進行賦值，求得最佳的系統設備選擇，並用一個工程實例驗證，結果表明此數學模型是有效的。
  7. In this paper, the target radiate characteristics and waveband selection of the infrared system reviewed briefly ; the suppression of the stray radiation in the infrared sub - system is discussed ; the material selection, the support structure and optimization of the primary mirror in the infrared sub - system of the theodolite, every factor which will affect the surface figure of the mirror is discussed in detail and get the result that in the circumstance of shooting range, the primary factor which affects the surface figure of the mirror in the infrared sub - system is temperature changing, this ca n be resolved by using material of low expansion coefficient and using same material in the mirror and the mirror seat

    本文將對紅外系統的目標輻射特徵分析和波段選擇進行簡要回顧，討論紅外系統中雜散輻射的抑制，並詳盡分析經緯儀紅外光學系統設計中所涉及到的反射鏡的材料、支撐、結構和優化設計等問題，認真討論和分析影響主鏡的面形精度的各種可能因素。並指出：在靶場環境下影響經緯儀紅外分系統主鏡面形精度的主要原因是溫度的變化，這種情況可通過選擇低線膨脹系數的材料並且使鏡座和反射鏡採用相同的材料予以解決。
  8. Multiple comparison method and similarity coefficient method were developed to estimate population size of the giant panda. the chi - square testing was used to determine the relationship between the occurrence of pandas and the type and intensity of human disturbance. habitat selection of the giant panda and impacts of human disturbance, such as logging, livestock grazing, herb collecting, poaching, road building, were quantitatively analysed by habitat selection index of manly

    同時還利用manly （ 1993 ）的選擇指數（ selectionindex ） ，定量分析王朗大熊貓對生物和非生物生境因子的選擇，特別是分析如採伐、放牧、采藥、偷獵、修路等人類干擾對大熊貓及其生境的影響，從而為保護區大熊貓的管理提供依據，將造成大熊貓瀕危的人類干擾降至最低。
  9. Aim at ubiquitous parallel multi - reservoir structure in our country ' s basin, the universal objective function including coefficient bi embodying a spatial significance difference at different flood control points and variable ai denoting a selection of scheduling mode is established, which provide a valid intervenor interface for flood control consultation decision. according to the real - time requirement, a model of reservoir storage allocation is proposed, which embody basic idea of phasic compensation. passing the dynamic correction to cut down the disadvantageous influence that indetermination result in on the certain degree, joining together the step alternation solving method, this model can maximally consider bias of decision makers, ensure the rationality and practicability of the solutions

    針對我國流域中普遍存在的並聯庫群結構，論文提出包含不同防洪點重要性的系數_ i和選擇調度模式的變量_ i的通用目標函數，為防洪會商決策，提供了有效的人工干預介面，根據實時性要求提出動態分配防洪庫容的庫容分配方法，體現了相機補償的基本思想，通過動態修正在一定程度上可以削減不確定性造成的不利影響，結合分步迭代求解技術，能最大限度體現決策者的偏好，保障解的合理性和可操作性。
  10. The optimized selection from deflection coefficient of speed - down gear for 1zs - 20 paddy cultivator

    20型水田耕整機減速齒輪變位系數的優化選擇
  11. Under the conditions of high safe coefficient of insulated electrical strength of the stator winding of the generator, the selection of earthing resistance value should meet the needs of matching one - point earthing protection of the stator and limiting the fault current

    在發電機定子繞組絕緣電氣強度有較高的安全系數的情況下，接地電阻值的選取應主要服從與定子一點接地保護的配合及限制接地故障電流的需要。
  12. The process of standardization is composed of six steps - the selection of standard firepower unit, construction of combat efficiency index system, calculation of index proportion, unity of capability index parameters, calculation of efficiency index, and conversion of standardized coefficient

    標準化過程主要包括標準火力單元的選擇、作戰效能指標體系的建立、指標權重的計算、性能指標參數的歸一、效能指數的解算和標準化系數的換算6個步驟。
  13. The diagonal flow fan has both the advantages of axial flow type and that of centrifugal type, the former of which is large coefficient of mass flow, high efficiency, and the latter is large pressure coefficient, wide span of work condition. consequently the diagonal flow type is a perfect selection for the performance zone which both the axial flow type and the centrifugal type ca n ' t reach, ant it has great value for engineering application

    斜流式風機不僅兼有軸流式風機大流量系數、高效率的優點和離心式風機高壓力系數、工作范圍寬廣的優點，因而在軸流式和離心式均不能覆蓋的性能區，斜流式風機是一種理想的選擇，有著較強的實用價值。
  14. Adaptive ramping coefficient selection for fairness algorithm in resilient packet ring

    彈性分組環公平演算法爬坡系數的自適應選擇方法
  15. Nowadays the research on the performances of security investment funds in china is mainly concerned with two aspects. the one is the feasibility of the theoretical model of performances and the simple computation by means of indicator formulation, which can be used to compute certain performance indicators, such as average profit rate per week, p coefficient, johnson coefficient, sharp ratio, var, average profit rate per week / var and etc. the other one is the research on the degree to which funds holdings are concentrated and research on the tendency of industry selection in the portfolios of funds managers. every part of market is trying to connect the portfolios selection of funds managers with the mar ket focuses and development directions, hoping that it can lead to the conversion and maturity of the ideas of market investment

    目前，對于中國證券投資基金績效的研究與評估，基本上圍繞著兩個方面，即績效理論模型的可應用性探討或簡單的指標公式套算，計算某些績效指標，如平均周收益率，貝塔系數，詹森系數，特雷諾系數，夏普系數， var和平均周收益率var等幾項指標；和對基金持股集中度的研究，以及由此引伸的對基金經理的投資組合中的行業選擇傾向的研究，市場各方一直在試圖將基金經理的投資組合選擇與市場熱點和發展方向連接起來，並希望籍此引導市場投資理念的轉變與成熟。
  16. After analyzing and studying the characteristics of the sequence generation of grey system theory, this paper proposes the concept of three - dimensional data sequence, extends the grey system theory from one - dimensional data sequence to three - dimensional data sequence and enlarges the application range of the theory in engineering. this paper also proposes a decomposition coefficient selection method and a partial concave - convex characteristic decision method to the preference generation, which can solve the problem that the internal point generated by the original method was inconsistent with the actual system. considering the errors existed in ends generation with step ratio and smooth ratio methods, the author proposes a tendency average generation and improves the quality of the generation greatly

    灰色建模與逆向工程兩者有其十分相似的內在關系，本文通過學科交叉，深入研究兩種不同學科理論，在繼承灰色系統理論這一我國原創性理論思想的基礎上，補充和豐富了新的內涵並將其滲透到逆向工程中的數據測量與數據處理技術的應用之中，使機械工程中甚少應用的這一灰色系統理論得到了進一步的拓展，主要成果如下: 1 .分析研究了灰色系統理論中序列生成的特點，提出了三維數據序列的概念，將灰理論的一維數據序列拓展到三維數據序列，拓寬了灰理論在工程中的應用范圍;提出了有偏生成演算法中生成系數分解選取方法和數據序列點局部凹凸特性決定生成系數的方法，解決了原有方法生成內點與實際系統不一致的現象;針對級比和光滑比用於生成端點有較大誤差的情況，提出了趨勢均值生成演算法，大大提高了端點生成的精度。
  17. The main factors have been determined to be the depth and width of hole, the strength of surrounding rock, the types of detonator, the decoupling coefficient, burden and unit consumption form what has been discussed, the author make use of those major factors as standard of affection and studied bp neural networks " work principle, structure and defectiveness. a model of modified bp neural networks has been used to built model in order to identify selection and optimize of blasting in rock anchor beam. triumphant parameter design of blasting were selected as a example, in order to perform network of parameter design

    確定以炸藥類型、最小抵抗線、孔深、炮眼間距、不耦合系數、線裝藥量、巖石強度和巖體完整度為主要影響因素；把改進的bp演算法應用在爆破參數優化設計中，建立以炸藥類型、最小抵抗線、炮孔深度、炮眼間距、線裝藥量、不耦合系數、巖石強度和巖體完整度為主要影響指標，選擇45例國內外成功的爆破參數設計實例為樣本，利用bp神經網路進行爆破參數優化設計，並通過現場保護層和巖臺修面爆破試驗以及對其松動圈范圍進行聲波測試，其測試結果最優的爆破方案其松動圈最小，這與神經網路進行參數優化設計的爆破方案相吻合。
  18. A research of portfolio selection model based on difference coefficient of principal component

    基於主成分差異系數的投資模型研究
  19. In samcluster system, the following cluster methods including hierarchical cluster analysis. k - means, and self - organizing map ( som ) and the feature selection methods based on coefficient of variation ( cv ) and simple t - test were integrated. to evaluate the performance of the samcluster system, the samcluster was applied to four expression datasets colon, leukemia72

    在samcluster系統中，整合了下列聚類演算法：譜系聚類、 k -平均值聚類和自組圖聚類與變異系數計算和t -檢驗等基因變量選擇方法，並提出了一致的樣本分型概念，通過對四個基因表達譜的數據集colon 、 leukemia72 、 leukemia38和ovarian的測試，結果表明：誤判的樣本數分別為5 、 1 、 0和0個，因此，基因水平的樣本分型與樣本的臨床分型高度一致。
  20. The application of path coefficient analysis in irradiation selection of single plant of rice

    通徑分析在水稻輻射育種單株選擇中的應用
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