forward difference method 中文意思是什麼

forward difference method 解釋
前向差分法
  • forward : adv 1 向前，前進 （opp backward）。2 【航海】在船頭，向船頭（opp aft）。3 今後，將來。4 出來，出...
  • difference : n. 1. 差異，差別。2. 不和，爭論。3. 【數學】差，差額。4. 【邏輯學】特殊性。vt. 〈罕用語〉區別，使有差別。
  • method : n 1 方法，方式；順序。2 （思想、言談上的）條理，規律，秩序。3 【生物學】分類法。4 〈M 〉【戲劇】...
  1. According to the engineering practice, the theoretical basis and method that survey directly the horizontal distance and height difference by the total station system as fourth grade and below fourth grade control network are put forward instead of surveying slant distance and zenith distance

    摘要根據工程實踐，提出了用全站儀直接測量平距、高差來代替測斜距、天頂距作四等及四等以下控制網測量的理論依據和方法，並以張河灣抽水蓄能電站施工控制網為例進行了比較計算。
  2. Combining with the performances of danshan bridge, discussing the methods on the construction controlling and calculation of cable - stayed bridge, this paper raises an efficient construction controlling system, and realizes collecting construction data of the real bridge and technical information. by analyzing on the difference of theoretical calculation and real construction state, the author determines to take self - adapting construction controlling method which uses kalman filter method to identify and adjust construction parameters. by getting rational construction state from forward iteration method, this paper, taking concrete creep effect in consideration, raises a rational scheme to pre - remain deformation and adjust cable force

    結合丹山橋的結構特點，通過對斜拉橋施工控制及結構計算方法的探討，提出了有效的施工控制系統，實現了對實橋施工數據和技術信息的採集；通過分析理論計算與實際施工狀態的差異，確定了以卡爾曼濾波法作為施工參數識別與調整的自適應施工控制方法；通過正裝迭代法確定其合理施工狀態，並考慮混凝土的徐變效應，提出了合理的預留拱度和索力調整方案。
  3. Since the temperature difference was most important parameters in thermal effects calculation, a combined temperature difference method considered year temperature difference and day temperature difference was put forward. with the combined temperature difference obtained from field tests, a lot of calculations have been done by finite element method ( fem ), considering of different structural measures. the law of displacement and stress in cshbb was presented and a relative displacement formula was deduced

    在介紹小砌塊建築的溫度作用分析方法的基礎上對溫度作用計算中最重要的參數? ?溫差取值進行了探討，提出了同時考慮年溫差和日溫差影響的組合溫差取值方法；根據各種不同的組合溫差取值方法，結合現場實測數據給出了試點建築的組合溫差取值，並考慮了不同構造措施的影響，對試點建築進行了有限元的溫度效應計算；給出了小砌塊建築的位移變化規律和應力變化規律以及層間相對位移的計算表達式。
  4. Through analysising the characteristics of the power system with floating neutral point deeply, the paper puts forward a new plan of single - phase to ground fault line selection on the base of s ' s signal injecton method and gives the hardware and software design. in this design, the high speed sampling and data processing is carried out through using dsp processor ; the large electrice current is drived through the application of a high - performance audio power amplifier and transformer ; the communication between host computer and detectors is realized through rs485 bus technology ; the difference multilevel frequency - selected amplifier is designed and the feeble signal of space is sampled on the base of the theory of magnetic induction ; the interface between dsp and exterior chip and rs485 interface logical is designed through using fpga ; the using of lcd module and keyboard interfacing chip makes the interface between human and machine ; the programme of host computer and detectors is designed through using blocking design method

    在本設計中，採用高速的dsp處理器，實現了對故障特徵信息的高速採集與處理;採用大功率的功放晶元與變壓器配合的方法，實現了大電流信號的驅動輸出;採用485總線技術，組建了裝置主機與多探測器之間的主從式通訊網路，實現了多干擾條件下裝置主機與多探測器的可靠通訊;設計了差分式多級選頻放大電路，採用磁感應的方法實現了對空間微弱信號的接收;利用fpga技術，實現了控制器與多外設的介面及數字信號的串並轉換;採用了先進的lcd液晶顯示模塊及鍵盤介面晶元，設計了人機信息交互的介面;採用了模塊化的軟體設計方法，開發了裝置主機及探測器的軟體程序。
  5. Article to college entrance examination chinese current situation of test, combination of thoery and practice, pass with western chinese graduation examination way, contrast of the method, middle school of developed country, the first part put forward college entrance examination chinese have an examination three principle that should follow, namely content and form of test should respect and meet hereditary quality and individual character difference of quality of student ; should work in concert with latest scientific research results ; should regard measuring students " innovation ability as the main purpose

    文章針對高考語文考試的現狀，理論聯系實際，通過與西方發達國家中學語文畢業考試方式、方法的對比，第一部分提出高考語文考試應遵循的三個原則，即考試的內容和形式應尊重和適應學生的遺傳素質和個性品質的差異；應與最新的科學研究成果相呼應，內容應新穎、獨特，能激發人的潛能；應以檢測學生的創新能力為主要目的。
  6. It studies and puts forward the flexibility difference curvature method, and many simulated damage examples show that the method has notable advantages such as high damage identification sensitivity, strong reliability, and visualization and simplicity in amount and graph analysis

    本文研究並提出了柔度差值曲率法，多個模擬損傷實例說明該方法具有損傷識別靈敏度高、可靠性強、數值和圖形分析直觀簡便的顯著優點。
  7. Puts forward an improved method based on the theory in which the enthalpy difference is considered as the driving force in heat transfer under wet cooling conditions and thinks that the method can halve the testing work, require less for the experiment devices and reach higher accuracy

    認為該方法遵循了焓差是濕工況下換熱推動力的規律，試驗工作量減少一半以上，對試驗裝置的要求降低，由試驗數據整理出的公式用於表冷器熱力計算完全可以滿足空調常用范圍內的要求。
  8. A patch antenna with air holes in the substrate has been designed. the finite - difference time - domain ( fdtd ) method together with the perfectly matched layer ( pml ) boundary treatment has been used to study the performance of the antenna. it is shown that the surface waves are significiently suppressed, the frequency bandwidth is improved, the sidelobe levels are reduced and consequently the gain in the forward direction is improved by 14 db ( about 4 db higher than the value reported previously )

    設計了一種基底鉆周期圓孔結構的電磁（光子）晶體貼片天線，用fdtd方法並結合pml吸收邊界條件對該天線進行了研究，結果表明本文所設計的基底鉆孔型電磁晶體貼片天線取得了多方面的性能改善，與普通天線相比，基底中的表面波受到很大抑制，天線的帶寬增加，遠場方向圖上天線的旁瓣和背瓣被明顯削弱，向前輻射的增益由原來的12db增加到26db ，增加了14db ，比文獻上報道的gonzalo等人的研究結果提高了4db 。
  9. ( 3 ) putting forward incentive institutions for intellectual capital of enterprises and analysing the difference and range of suiting of different incentive institutions by systems analysis method and comparative analysis method

    三、運用系統分析法和比較法提出了企業智力資本按價值進行分配的激勵制度，並分析了不同激勵制度的異同及適用范圍。
  10. According to the high dispersedness and low precision of measurements when using the traditional time difference method in small diameter and low flow rates conditon, this paper brings forward a new method based on high - speed data acquisition technique. the time difference comes out accurately with high resolving ability of time by using the method and the signal processing algorithms. the developed ultrasonic detection system is composed of two ultrasonic detectors, a transmitting and receiving ultrasonic unit, a high - speed data acquisition unit and a computer

    本文針對傳統的時差法在小管徑、低流速測量時，具有測時結果分散性大、測量精度受計數頻率的影響大等不足，創造性地把高速數據採集技術應用在超聲波流量、壓力測量上，用信號處理演算法求時差，使時差成為一個統計量，有效地克服了超聲波傳統時差法測量精度差、不能測量小管徑、低流速流體流量的缺點，提高了時差測量的解析度和精度。
  11. This conversion is based on the analytic expression of sonic and elastic wave equation, and use the different wave field extrapolation, which is initially used in seismic migration and forward modeling. this paper introduces the easy and efficient finite - difference method to realize the conversion by comparing three different methods

    論文經過對三種常規波場延拓方法（ kirchhoff積分法、頻率波數域法和有限差分法）優缺點的比較，採用了簡單易用的有限差分方法來實現這種轉換。
  12. The performance of the pbg antenna using the new pbg cover together with a pbg substrate is studied by the fdtd method together with the pml boundary treatment. the numerical results show that a more focused beam radiated in the broadside direction is achieved. the gain of the pbg patch antenna in the forward direction is improved by about 6 db. the radiation directivity is improved significantly and reaches 11. 5 db, which is 0. 4 db less than the maximum value that is allowed physically for this size of the antenna ( this difference is about 4. 1 db less than the difference achieved by thevenot et al.,

    用fdtd方法並結合pml吸收邊界條件，我們對加了這種新的覆層結構並且基底鉆孔的復合結構電磁（光子）晶體貼片天線的性能進行了研究，結果證明加了這種新的電磁晶體覆層結構以後，天線的波束收攏很多，並且向前輻射的增益大大提高，與普通天線相比，天線的e面和h面方向圖上向前輻射的增益均提高了約6db ，另外，該復合結構天線的方向性系數達到了11 . 5浙江大學博士學位論文db ，與該物理尺寸天線的方向性系數的理論極限值（ 11 . 9db ）相差0 . 4db ，該差值比thevenot等人設計的電磁晶體覆層天線的相應差值減少了約4 . 1db ，比qiu等人設計的電磁晶體天線的相應差值減少了約1
  13. The study shows that limited difference forward method has higher precision and computing speed in geo - electrical forward modeling

    研究表明，利用有限差分數值方法進行復雜地電模型的正演計算，計算速度快，計算結果精度較高。
  14. The authors first infered the boundary condition for line source, then realised the forward calculation with finite - difference method

    針對垂直有限線源，首先推導了線電流源的邊界條件，利用有限差分實現了三維地電場的正演。
  15. In order to filter out the noise contained in effective optical signal, a new method using the blazed grating to enlarge the angle difference between noise and effective signal, and getting through the iris to get the effective signal was put forward

    摘要為了濾除有效光信號中的光噪聲，本文提出了一種利用光柵的閃耀特性將噪聲和有效信號之間的夾角角度差放大，再通過光闌得到有效光信號的方法。
  16. Thirdly, ultimate bearing capacity theory was applied in the design of asphalt pavments. ultimate state design method for asphalt pavment structures was put forward and illustrated by a specific example. difference in design thickness by method of this paper and that of specifications was compared

    再次，將極限承載力理論應用於瀝青路面設計領域，提出了瀝青路面結構極限狀態設計方法，通過具體實例來說明，並比較了按本文方法與按規范方法得出的設計厚度的差異。
  17. To accept the current signal from high negative voltage circuit, the analog ground is raised to a certain positive voltage, which makes it possible for the signal amplitude to be compressed at the same time of its polarity reversion. a pi control program special for laser gyro current control is brought forward according to the conventional pid control method, in which the control signal is figured out corresponding to the difference between the sample and the reference value by turn of proportion - short step integral - long step integral. and at the end of this paper, a comparison of system performance on different conditions is made and the key elements influencing system performance are educed

    利用集成a / d 、 d / a轉換器的新型晶元aduc824 ，實現了電流（電壓）采樣?數據處理?電流控制的閉環控制結構；地電位的抬升解決了a / d轉換器對負高壓迴路電流采樣時的輸入范圍匹配問題；控制信號反相的同時進行幅度壓縮，使得輸出調整電壓的解析度提高；根據常規的比例?積分?微分（ pid ）調節模型，針對陀螺系統的特性，給出了一種可以滿足系統要求、據采樣值偏差大小進行的比例?大步長積分?小步長積分、分層次比例?積分演算法；不同條件下系統穩流性能的對比、分析在論文最後給出，並據此找出了決定該系統穩流精度的關鍵因素，提出了系統的改進意見。
  18. The dissertation endeavors to identify, probe and develop new theories and tools that will work in digital time in scm area by systematic studies. on the basal theories of scm and e - business, analyzes the difference of scm in environment of e - business with traditional environment, puts forward the method, principle and step of designing and constructing of supply chain in e - business, probes into the collaboration management of supply chain from two aspect, one is hard road, another is soft road

    從供應鏈管理和電子商務的基本理論出發，分析了電子商務環境與傳統商務環境下供應鏈管理的差異；提出了電子商務環境下供應鏈設計與重構的方法、原則和步驟，指導企業設計適合自己的供應鏈；對電子商務環境下如何實現協調運行展開分析，從軟約束和硬約束兩個方面來探討供應鏈的協同管理問題。
  19. The accuracy and the existent problem of forward difference method are analyzed on the basis of comparing the transfer function of recursive formula with theoretical transfer function

    從遞歸公式傳遞函數與理論傳遞函數比較的角度研究了計算中的精度及所存在的問題。
  20. This paper puts forward a kind of fast and effective method of muting value based on the curvature formula, and it can automatically discern mutating data using half two rank difference method and get rid of the false data

    該方法以曲線的曲率公式為理論基礎，用相鄰點間的半二階差分對突變點進行自動識別，並將其剔除。
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