Since the securities investment fund was first come up on march in 1998, it has six years development. till february 2005, there have been 124 securities investment fund published. even though the securities investment funds are developing fast, but the research about appraisal of the securities investment fund was only the first stage. some scholars attempted to do this thing, and some securities company also have reports about evaluation of securities investment fund, but there are not any feasible 、 fair 、 authorities methods and standards to evaluate of securities fund, and even any reliable evaluation outcomes are never published. the published information is only net value to be often know, the information about assets, liabilities, operation, portfolio can be known by annual reports and quarterly reports. published information on funds is defect, all these things make the investors know little about the funds, and even feel it mysterious, the result is to hinder the development of the fund. however, in the foreign countries, the ordinary investors often use funds as the investment tools. the evaluation outcome of securities investment fund is published everyday for the investors. to the fund managers, they must scientifically appraise their performance periodically or non - periodically, through this way, they can make asset of funds stable increase at long term. in a word, the scientific funds evaluation is very important to both the investors and the managers
二、研究目的基金業績評價研究是促進基金業健康發展的重要環
節。建立一套完備的基金業績評價體系無論對投資者和基金管理公司,還是市場監管部門都具有非常重要的意義。對于投資者而言,通過分析基金的業績,可以獲得基金投資操作的準確信息,從而能及時調整投資策略,做出正確的投資選擇,避免
盲目跟從一些不實資訊而遭受損失;對于基金管理公司而言,建立科學的基金業績評價體系,不僅可以對基金經理的努力程度和業績水平給出具體的量化評價,還可以依此來分析所實施的投資計劃是否達到或超過了投資目標,發現投資計劃的不足,判斷基金投資策略在市場中的適應能力,總結管理成功的經驗,提高公司的經營管理水平;對于監管部門而言,則可以通過建立
Traditional delay estimation based on ica requires the trail sequences to initialize the receiver, but the new algorithm based on ica does not need the trail sequences. it is based on the channel character of downlink, using the ica algorithm to estimate the multi - path mixture matrix, then, find the delay information which is embodied by the column vector of the mixture matrix. the simulation results show that it does enhance the performance of traditional detector without wasting the invaluable frequency resource
傳統的通道估計演算法需要訓練序列使接收端的參數調整到理想狀態,而本文提出的基於ica的通道估計的多用戶檢測演算法不需要訓練序列,它是利用下行通道的固有特點,用ica的
盲源分離法估計出多徑通道的卷積矩陣,從而從中提取出通道的延遲信息,模擬實驗結果證明這種方法在
節省了頻譜資源的同時取得較好的估計效果,使得傳統的接收機的誤碼性能得到了很大的提高。
Throttle blind capacitor
節流
盲室
Because of forecasting reactive load at first, it can detect the change of voltage at low - voltage bus from the change of reactive load or the change of voltage at high - voltage bus, then it can decide that adjusting transformer tap or capacitor switch, and avoid blindly and deficient adjusting. on the condition the reactive power is balanced and voltage qualified, it can realize the switching times of loaded taps and capacitors being efficiently decreased
由於預先預測出無功負荷,提前了解了無功功率變化的趨勢,可以有助於判定低壓母線電壓變化是由無功負荷變化引起還是由高壓側電壓變化引起,從而適時決定是調有載調壓變壓器分接頭還是投切電容器,以此避免了
盲目和不充分的調
節,實現在保證無功基本平衡和電壓合格率的前提下,減少有載調壓變壓器分接頭的調
節和並聯電容器組的投切次數。
The finite element method ( fe '. i ) is adopted to analyze the effects of the numbers of coil turns, current intensity and current frequency upon the rate of joule heat generation in details. the thermo - radiation analytical countermeasures of various types are adopted to carry out the numerical analysis of the effects of the crucible with different shapes and sizes and the blind holes with different depths opened in the tops of crucibles as well as coil positions upon the thermal field distribution whereby solving the main problem of field the thermo - field design of the induction - heating sic crystal growth system. a new combination idea of the thermo - field design obtained by means of the united design of the thermo - insulator and blind holes has been presented
採用有限元分析方法對線圈匝數、電流強度、電流頻率等對焦耳熱產生速率的影響進行了詳細的分析討論;採用不同的熱輻射分析策略,對不同坩堝形狀、坩堝頂部開設不同深度的
盲孔以及線圈的位置等對熱場分佈的影響進行了數值分析,解決了感應加熱碳化硅晶體生長系統熱場設計的主要問題,提出了通過絕熱層與
盲孔的聯合設計獲得所需熱場設計的思路,給出了根據軸向溫度梯度的波動對線圈位置實行動態調
節以控制熱場的理論依據。
3069. 700 and 3096. 710 vertically adjustable loadfoot bowl head for best force transmission for force transducers with blind hole
垂直可調
節負載底座碗形頭,用於頂級的帶
盲孔力傳感器的力傳遞
Simulating the electronic devices by computers, can forecast the real performance of devices before experiments. by discussing the effects of changing the size and material, we can reduce the blindness and times of experiments, and save the experiment outlay. computer simulation of field emission cathodes is an important research topic
利用計算機來模擬電子器件的性能,可以在實驗前預測器件的性能,探討器件結構尺寸、材料等因素對器件特性的影響,減少實驗的
盲目性,從而可以減少實驗次數、
節約實驗經費,因此關于場發射陰極的計算機模擬也是一個十分重要的研究課題。
International day of the blind
月15日國際
盲人
節
( 2 ) combining secondary genetic algorithm with back - propagation network, the thesis redacts genetic neural network procedure, which optimizes number of hidden node and weight value and threshold value simultaneously. the procedure overcomes blindness during search, avoids falling into localminimum and increases learning accuracy
( 2 )編寫了遺傳神經網路ga - bp程序,採用二級遺傳演算法與bp演算法相結合,同時優化網路隱層節點數和權值、閾值,既克服了尋優過程的盲目性,又避免陷入局部極小,提高了網路的學習精度。