擇向性指數 的英文怎麼說
中文拼音 [zháixiàngxìngzhǐshǔ]
擇向性指數
英文
directivity index-
Nasdaq lays much emphasis on self - supervision with multi - level markets, where enterprises can, in accordance with their own conditions, choose to list on national ones or small ones. it lays down various quantity standards and uniform non - quantity standard and sets down precise information - publicizing system under the " three open " principle. hong kong gem is beginning the practice of self - supervision
納斯達克市場強調自律監管，設立多層次市場，企業可以根據自身的條件選擇在全國市場或小型資本市場上市，規定了退市的不同的數量標準和統一的非數量標準，在「三公」原則的指導下制定了詳細周密的信息披露制度；香港創業板市場正在向自律監管過渡，設立單一市場，退市的數量標準和非數量標準缺乏彈性，強調信息披露有效、即時與充分。The increasing of single channel capacities and evolution of optical networks topology, from simple point - to - point to intelligent optical networks, call for strict demands to optical filters. in this paper, the crucial technologies of optical filters such as interleaver, optical digital filter, fused biconical taper all - wave coupler as well as polarization - pump combiner have been studied experimentally and theoretically, which include : 1. a new process, cascaded fbt ( fused biconical taper ) with precise control as well as strict interference arm length difference, is proposed for the first time to our knowledge
單通道速率不斷提高以及網路拓撲由單一的點對點傳輸向可上下載的環網和可動態選擇波長路由的智能型格形光網路演進，對光濾波器的常規性能指標、時域特性和動態可調諧特性提出了更加苛刻的要求，鑒於此，本論文全面研究了全光纖熔錐型奇偶交錯濾波技術、數字光濾波技術、基於g - t全通濾波器的奇偶交錯濾波技術以及熔錐型全波耦合器和偏振泵浦合波器。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。In the following several chapters, the paper introduces the main design procedures, including " selecting the scheme ", " calculating the parameters of technique specialty ", " the constitution and characteristic of the driller ", " the design calculation and calibration of the crucial parts ". then discusses the drilling technology and introduces the work principle, the complexion of the sampler drill " s installation and testing. at last, the paper generalizes the design and the experimentation, points out the next target
分「總體方案的選擇」 、 「技術特性參數的確定」 、 「鉆機組成和特點」以及「關鍵部分結構的設計計算和校核」幾個部分；然後是鉆進工藝的討論，並介紹了三套取心鉆具的工作原理以及室內安裝、調試、實驗的情況；最後總結了本次設計及實驗情況，並指出下一步的努力方向。With applying bpann, the model of tactic selection can be put in practice. the key problem of applying bpann is efficiency of arithmetic, which is solved by comparing efficiency of arithmetic in different arithmetic
採用前向人工神經網路（ bpann ）實現策略選擇模型，主要分析bpann原始數據處理問題? ?指標體系可靠性，在matlab6 . 0環境下分析bpann的演算法和泛化能力。Chapter three the positive research of our country ' s stock market that utilizes the risk measurement index, uses the index and method about measurement of risk which discussed in chapter two, has carried on the positive research to the investment risk of china ' s stock market, and draws two conclusions : first, decentralized investment really can reduce unsystematic risk, dispel over 90 % unsystematic risk when the number of stocks are about 10 ; second, when general trend of events downwards, choose stock portfolio with low value, can reduce investment risk of stock portfolio effectively
第三章「我國證券市場利用風險度量指標的實證研究」 ，用第二章中討論的有關風險度量的指標和方法，對中國證券市場的投資風險進行了實證研究，並得出兩個結論：一是分散化投資確能降低非系統性風險，當組合股票數為大約10隻時已消除超過90的非系統性風險；二是當股市大勢向下時，選擇值較低的投資組合，可以有效降低證券組合的投資風險。Furthermore, in the second part, the author makes a deeply discussion and research on the design scheme of dalian tv station non - linear av editing network including the double - net framework, the digital compress technique, the virtual storage technique, the choices of digital compress format, the account of terminal stations, the manage functions and security of the system, etc. finally, in the third part, the author introduces the progress of non - linear av editing network in the future, showing the choices of compress format, software function, i / o interface, whole system of programming and broadcast, combining with internet and interactive tv, points out the direction of tomorrow tv technology system
在此基礎上，隨后在文章第二部分對大連電視臺的非線性視音頻編輯網建設從其核心技術與具體網路設計方案進行了詳細的闡述。其核心技術主要包括雙網結構、數字壓縮技術、虛擬存儲技術等；具體網路設計方案則包括數字壓縮格式的選擇、站點的數量及功能、系統的管理功能及安全性分析等幾個方面。文章的第三部分則主要通過壓縮格式選擇、軟體功能、上下載介面、制播一體化、與internet結合、交互電視等方面展開對電視臺非線性編輯網路的發展的論述，指出未來電視技術系統的發展方向。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。By using dialog box technology, the design wizard of expert system for planar disc cam mechanism is created. which can guide user to complete the data input and selection step by step, and the design result can be shown on the main interface. the usage of the design wizard make the espdcm possess of friendly interface
以對話框的形式建立了平面盤型凸輪機構專家系統的設計向導（ wizard ） ，指導用戶逐步進行各種參數的輸入與選擇，設計的結果可直接顯示于系統的主界面上，從而使該系統具有友好的用戶界面，體現了專家系統的易用性。Correlative function method and variable function method are used to calculate the relevant range of soil layer. the limit capacity of bored pile is determined by the cone penetration tests ( cpt ) and the static loading tests and related statistics parameters are also evaluated. considering the effects of group piles, the action effect is calculated by the settlement of pile foundation and the reliability index of single pile as well as group piles is determined by monte - carlo method
本文選擇臨近場地的四座高層建築地基的全部勘測資料，以沿深度方向的一維平穩高斯隨機場作為樁基土層土性參數的數學模型，利用相關函數法和變異函數法計算土層的相關范圍，由cpt和靜載試驗結果綜合確定鉆孔灌注樁的極限承載力，進而對相同場地各試樁的承載力進行折算后檢驗其概率分佈，並估計有關統計參數：考慮群樁效應確定樁基承載力，由樁基沉降反算其作用效應，由monte - carlo方法計算單樁及群樁的可靠指標。Then we also study the effect of string on the dynamical characteristic under the symmetric load and not under the symmetric load as the prestressing is the key making beam string structure the balanceatie system, having large rigidity and embodying the superiority of dynamical characteristic of this structure, this paper studies and conceives how to deteimine the number of the prestressing in each stage of construction and through comparing between the plan of onetime and repeated pulling construction choose the suitable pulling construction plan
並且本文還研究了在對稱荷載和不對稱荷載兩種工況下，結構的受力性能隨豎向撐桿數目、結構垂跨比以及下弦索預應力等參數改變時的變化情況，總結出該結構受力方面的特徵，為實際工程設計提供依據。鑒于預應力是使張弦梁結構形成自平衡體系、具備較大剛度和體現結構性能優勢的關鍵，本文研究和探討了結構施工各階段該預應力大小的確定方法，通過一次張拉與二次張拉方案各項指標的比較，選擇適當的預應力張拉施工方案。分享友人