擇向性因數 的英文怎麼說
中文拼音 [zháixiàngxìngyīnshǔ]
擇向性因數
英文
directivity factor-
In this paper, ackerman steering linkage of double - wishbone suspension is taken as the study object, choosing the splitting joint and steering lever joint to carry out the design of optimization the mathematics models are established based on the multi - body system dynamics, applying its analysis method of kinematics to study the mechanism kinetic principles owing to more spatial factors considered, and calling off many hypotheses affecting the accuracy, compared with the traditional methods, the models are better to reflect the realistic motion principles, the results are more exact and applicable moreover, the force analysis is applied to the conduct mechanism the analysis method of dynamics in the multi - body dynamics is applied to study the forces applied on every component, working out the constraint reaction force of up and down ball joints, and developing the current computation program in the end, produce the upper wishbone geometry model in the ansys software package, meshing and carrying out the fea, testifying if the intensity of the wishbone meet with the requirements
本文以雙橫臂獨立懸架的轉向傳動機構作為研究對象，選擇對斷開點和節臂球銷的位置進行優化設計，在此基礎上建立了基於多體系統動力學的導向機構和轉向傳動機構的數學模型，運用該學科的運動學分析方法研究機構的運動規律，編制了通用優化設計軟體。由於考慮了更多的空間因素，取消許多影響準確性的假設，因此建立的數學模型與傳統的方法相比更能反映實際運動規律，得到的優化結果也更加精確實用。此外，本文還針對導向機構進行受力分析，在建立該機構的空間動力學模型后，運用多體動力學中的動力學分析方法研究各個桿件的受力，計算出上下球鉸的約束反力，並開發出了相應的通用計算程序。And understanding and studying the spectral features and variation rules of geo - targets in the experimental area, raising that it is the basis of geo - targets information collection with imaging spectrometer data to understand spectral features and variation rules of geo - targets, realizing that in a great extent spectral - integrated - form - based classification method can remove the phenomenon of " different spectrum with same objects " resulted from reflection ratio curve translation because of the angle change among sensor, targets and observation direction, and the average and variance images can be introduced to solve the problem of two kinds of geo - target with similar spectral forms and much different values of whole reflection ratio. it is suggested that " red edge " range bands of vegetation, which has close relationship with vegetation cover and biomass, is the main characteristic bands and important basis for careful vegetation classification and quantitative retrieval, and pixel - based derivative spectral analysis is very useful for removing the effects of soil background values and quantitatively retrieving vegetation biomass and cover. the remote sense quantitative retrieval model is developed for main appraisable factors of desertification monitoring assessment with imaging spectrometer data and then the applicability of model is analyzed
研究結果如下：首先針對荒漠化地區的地物特徵，對高光譜數據不同波段的數據質量、波段組合進行了評價，提出了適用於荒漠化監測的基本波段選擇集；初步了解和掌握了研究地區的地物光譜特性及變異規律，進一步明確了掌握地物光譜特徵和變異規律是用成像光譜儀數據提取地物信息的基礎；發現了基於光譜整體形狀的分類方法在很大程度上能夠消除由於傳感器、地物目標觀測方向之間的角度變化引起的反射率曲線整體平移的「同物異譜」現象，對于譜形相似而整體反射率的值相差較大的兩類地物，通過引入均值和方差圖像參與分類得到解決；研究還表明在植被「紅邊」范圍內的波段是進行荒漠化監測的主要特徵波段，這些波段與植被生物量和蓋度都有密切的關系，是開展精細植被分類研究和植被定量反演的重要基礎；像元的導數光譜分析可以消除土壤背景的影響，是進行植被生物量和蓋度定量反演的有力工具；建立了荒漠化監測主要評價因子的定量反演模型，並分析了模型的適用性。This dissertation can be divided into three parts as following : focusing on institutional risk control, this dissertation demonstrated the effect of institutional risk on dis " objects by analyzing the relationship between deposit insurance and financial development, financial stability and market discipline, in light of foreign or native primary theory and empirical results of dis. in virtue of statistical method and with the theory of game, this dissertation explored the cause the institutional risk such as moral risk and adverse selection, on the basis of which discussed the approach of controlling institutional risk and proper deposit insurance pattern. because deposit insurance assessment is the core of institutional risk control, this dissertation introduced and discussed deeply the passive casualty - insurance model, the option - pricing model, the game - theory - based pricing model, and reasonable pricing interval, and put forward the hierarchical pricing strategy of dis on the balance of information confiscatory and risk - based - assessment necessity
本文以存款保險制度風險控制為中心，在借鑒國內外關于存款保險制度的基本理論和實證的基礎上，通過分析存款保險與金融發展、金融穩定和市場懲戒等方面的關系，論證了存款保險制度風險對存款保險制度目標的影響；並藉助統計學的方法，運用信息博弈論的觀點，從主要制度參與者? ?投保機構和存款保險機構? ?的效用函數出發，對存款保險所引發的道德風險和逆向選擇等制度風險的成因進行深入的剖析，探討有效控制制度風險的途徑和制度參數的安排模式；由於存款保險定價是制度風險管理的核心問題，本文還專門對意外存款保險消極模型、存款保險的期權定價模型、基於信息經濟學的存款保險定價模型以及合理定價區間等定價模式進行深入分析和詳細評述，闡述各種定價思路的局限性和可能運用的空間，通過權衡信息的充分性和風險定價的必要性，提出存款保險制度的層次性定價策略。On account of the uncertainty existing in the nonlinear ship responded model, we design a dynamic adaptive ship steering controller by using adaptive backstepping. after deducing the update law of the unknown constant, we choose the controller gains to guarantee the closed loop system and the control signal global boundedness
由於船舶非線性響應模型中含有未知常參數的不確定項，因此採用自適應backstepping的方法，選擇參數自適應調節律，設計動態的船舶航向控制器，實現在線控制。In this paper, the behavior of the ill - posedness of the anisotropic diffusion is analyzed through the energy function
針對各向異性擴散方程中的「病態性」問題，從能量函數的角度對其原因進行分析，並依據穩定性的要求選擇合適的擴散系數。These factors are physical capital, human capital, technology change, the level of specialization and the quantity of farmers. furthermore, on the basic hypothesis that farmers are rational economic men, it points out the negative attitude of farmers on improving these factors is rational choice. the actual land system, social security system and hukou system conduce that the property right of land is instable and difficult to be exchanged, the quantity of farmers is unable to decrease
本文首先建立了一個簡單的數學模型，考察了直接影響農民農業收入的基本因素，包括：物質資本、人力資本、專業化水平、技術知識和農民數量；進而，從農民是理性經濟人的基本假設出發，指出農民在改進影響農業收入的諸因素方面的消極態度是既定製度約束下的理性選擇? ?現行的農地制度（社會保障制度） 、戶籍制度導致土地產權不穩定、難以流轉和農民數量難以減少，妨礙了土地的規模經營，使農民在物質資本投資、人力資本投資、深化專業化分工、學習和應用技術知識、向城市轉移勞動力方面表現出消極態度。With fast development of our country " s gas industry and air ' s increasingly serious contamination in city, using gas instead of coal and supplying energy in high efficiency and cleanliness has become necessary way in city. there are different problems in the current heating ( air conditioning ) systems. in the cogeneration system, heat and power affect each other, heating - pump heating ( aie conditioning ) system can not satisfy the peak load very well, the cost of gas fuel in boilor heating sestem is so high. the high generating efficiency of the diesel - engine two - sourse heating ( air conditioning ) systems is limited in range of 100kw - 1000kw, the heating scope is so limited. combined cycle of two sourse heating ( air conditioning ) system is most suitable selection to buesness community with big scope my paper aim at this syetem ' s primary question when it is applied in our country - - - - bringing project into execution and technology economy feasibility and off - design performence, combined with a certain demonstrating project in beijing buesness community, going along with calculating and analyzing, drawing out some efficient datas and conclusions, based on this, bringing out primary alements affecting combined cycle of two sourse heating ( air conditioning ) system " economics
熱電聯產系統熱電相互牽連，熱泵供暖（空調）系統不容易很好地滿足尖峰負荷，鍋爐供暖系統供熱中天然氣燃料構成的成本過高，內燃機雙源供暖（空調）系統的高發電效率僅限於100kw - 1000kw負荷范圍，供熱面積有限。對于大面積的商業園區、居民小區，燃燒天然氣的燃氣-蒸汽聯合循環雙源供暖（空調）系統是最佳選擇之一。本論文針對該系統在我國應用時的主要問題- - -方案的技術實施與技術經濟可行性，結合北京某一商業園區示範工程，進行了系統的計算與分析，得到了有效的數據與結論，在此基礎上，提出影響聯合循環雙源供暖（空調）系統經濟性的主要因素，並進行敏感性分析，得出有益的結論；最後通過各種供暖方案的比較分析回答了某些人對該系統的疑慮和不解，並指出系統的優化方向。Four mechanisms of sperm competition ( sperm stratification, sperm incapacitation, sperm removal and sperm flushing ), four impact factors on paternity ( mating order, number of mated males, mating intervals and cryptic female choice ) and three kinds of male ' s adaptation mechanisms of sperm competition ( morphological adaptations, physiological adaptations and behavioral adaptations ) are reviewed
闡述了精子競爭的概念，綜述了精子層化、精子失能、精子移除和精子沖洗4種昆蟲精子競爭的機制以及雄性在形態、生理和行為上3類避免精子競爭的機制，詳細討論了交配次序、交配雄性數量、交配間隔以及隱秘雌性選擇4個影響父權偏向的因素。This algorithm adopts a middle ground between centroid - base and all - points - based approaches. instead of using a single centroid or all points to represent a cluster, a fixed number of representative points in space are chosen, these points represent and capture the geometry and shape of the cluster. in addition. the representative points of a cluster are generated by first selecting well - scattered objects for the cluster and then " shrinking " or moving them toward the cluster center by a specified fraction, or shrinking factor. the shrinking helps dampen the effects of outliers. therefore, cure is more robust to outliers
該演算法選擇基於質心利基於代表對象方法之間的中間策略，它不用單個質心或簇中全部對象米代表一個簇，而是選擇數據空間中定數目的只有代表性的點，這些點代表和捕捉到了簇的形狀。此外，由於引入了收縮因子使代表點向簇小心「收縮」而使該演算法能夠較好地消除孤立點的影響，在處理孤立點上也更加健壯。In the sub - chapter : the selection of cost driver, the following topics are illustrated : the elements which influence the resources driver, the analysis of selecting the number of cost driver and the strategic cost driver
在成本動因的選擇問題小節內闡述了影響資源動因的因素、成本動因數目選擇分析和戰略成本動因。影響資源動因選擇的主要因素有abc目標、成本、行為導向、相關性等。The self - esteem could not be used as a significant influential factor on life satisfaction in the chinese culture. ( 3 ) the hypothesized model on the control strategy, self - esteem and life satisfaction are fit in the data, indicating that the model possesses cross - cultrual consistency ( 4 ) in the two samples from shanghai and ningxia, the selective secondary control was employed more frequently by the male than the female, the other control strategies, self - esteem and life satisfaction have no significant diff erence between the two areas and between genders
在中國文化背景下自尊可能不能作為影響生活滿意度的顯著因素； （ 3 ）基於成功老齡化畢生控制理論而假設的關于控制策略與自尊、生活滿意度相互關系的結構方程模型與實際測量數據擬合良好，表明該理論模型具有跨文化的一致性； （ 4 ）上海、寧夏兩地樣本被試（受教育水平較高的知識分子）中，男性比女性更多傾向于使用選擇性二級控制，在其它控制策略、自尊和生活滿意度上未發現明顯的地域差異和性別差異。For the quantification risks, the " geometric mean " is selected as the tool to rate the risk level ; for the qualification risks, the ahp approach was used to illustrate the different risk level. 4 、 the ahp method was proposed to determine risk response plan. by this approach, the various risks knowledge dispersed within the risk management organization such as the managers " experience and project history data can be used for the project risk management
為了解決風險因素特性的難于量化問題，本文還另外給出了風險重要度的定性整合ahp方法； 4 、提出了風險響應措施擬定與選擇的ahp方法；該方法可以有效地利用分散於項目管理機構中的風險信息（經驗、數據） ，選擇出最適宜的風險響應措施； 5 、提出了工程項目風險管理的循環周期概念，通過該周期的循環體現項目風險管理的面向過程性和動態性；將周期性風險管理與項目本身的生命周期有機地結合，提出了一個面向過程的項目風險動態管理框架體系。Because the uses of svm depends on the selection of kernel function parameter and error warning factor, mebml is used to search for the best parameters, provide a new way of combining support vector machines and mebml to classify and recognize, it solves the problem of svm ' s parameters selection, simulating on the orl face image database, the result shows improved face recognition base on support vector machine are effective
由於支持向量機的推廣性取決于核函數參數與誤差懲罰因子的選擇，為此採用思維進化演算法對其參數進行優化選擇，提出支持向量機與思維進化演算法相結合的新型演算法進行分類識別，演算法解決了支持向量機參數選取的難題，利用orl人臉庫進行模擬實驗，結果表明，基於改進的支持向量機的人臉識別技術識別效率高、方法有效。分享友人