describing function method 中文意思是什麼

Innovation of the aero maintenance system based on augmented reality ( ar ) technology and eye tracking technology, which can give real - time instruction for maintenance, is vital for enhancing the accuracy of maintenance and reducing the cost of maintenance. in the paper, the study work include 3 sections, as following : firstly, deducing 3d registration algorithm based on markers, depicting the display and 3d display technologies of artificial matters, and realizing 3d registration function specifically ; secondly, establishing an eye - movement measurement system based on the infrared television method, making use of the thoughts of ranks superimposition to withdraw the pupil center coordinates, and giving the thaught of recombining the position relation of purkinje spot to determine the eye sight direction primarily ; finally, describing the basic theory of augmented reality maintenance guiding system in detail, and introducing the software function and hardware frame, which will provide the foundation for the further study of this system

本文的研究工作主要包括以下三個部分:首先，改進了有標志點的三維注冊演算法，並具體實現了三維注冊功能，最後試驗驗證了注冊演算法的正確性，為將來基於無標志點的發動機維修誘導系統的研究提供基礎和實踐經驗;其次，描述了基於紅外電視法的視線跟蹤系統的基本原理，對眼動信號處理技術做了初步的研究，即利用了行、列疊加的思想提取了瞳孔中心坐標和普爾欽（ purkinje ）斑點的坐標，闡述了結合瞳孔中心與普爾欽（ purkinje ）斑點的位置關系進行初步判定視線方向的方法;最後，詳細描述了所構建的增強現實維修誘導系統的基本原理、軟硬體框架，為今後維修誘導系統的深入研製提供基礎。

This text completely and systematically studies the status and the development of the pyrolysis and the fluidization of biomass, which distill the bio - oil in the domestic and international area, as well as the existing problems. this thesis primarily include following aspects : ( l ), by experimenting and measuring the energy ( heat value ) and the content of c, h, n chemical element of right 20 kinds of common biomass, on the base of the experimental result, and respectively established the biomass energy predict experiment formula with the element of h and c is from change, and passed the ro. os examination, which provides the basis and convenience for flash pyrolysis fluidization device energy to convert the rate to compute with biomass energy utilization calculation ; ( 2 ), proceeded the tg and dtg experimentation equal velocity ( 10 ? / min, 20 ? / min, 40 ? / min, 60 ? / min ) heating and constant temperature heating by studying on eight kinds of biomass samples, according to the experimental data and arrhenius formula, we established the dynamics model of pyrolysis of, then, using the goast - redfern and p function, we also solved the dynamics parameters and analyze out every kind of biomass ' s frequency factor and parameters of activation energy, and established the every kind of dynamics model of pyrolysis of biomass, all of these provide the theories and basis to make sure the reactor ' s flash pyrolysis work temperature scope design and the describing of pyrolysis reactor dynamics ; ( 3 ), in order to study and ascertain the process of heat completely getting to pyrolysis time of varied size biomass particles, we observed and measured the ratio of length and diameter ( l / d ) with the varied biomass through electron microscope, we concluded the l / d ratios usually is from 5. 0 to 6. 0, the average is 5. 3 ; ( 4 ), we studied the process of biomass transiting and the theory of complete pyrolysis time with the theory of complicated heat field, we got the time ( t ) of the varied size biomass particles arriving to complete pyrolysis, and we knew that the complete pyrolysis time and the time which get to the biggest production ratio are identical, all of these studies provide the theory base for design and forecasting the flash pyrolysis reactor solid state resort time ; ( 5 ), according to the above experiment result, synthesize to make use of the engineering the mechanics, engineering the material, machine the design to learn the principle, deduce, establish the theory of rotation cone flash pyrolysis reactor material resort time ( t ) and reasonable rotation velocity ( or frequency ) relation theory ; and ( 6 ), we gave the reactor ' s smallest cone angle certain, reactor cone wall strength design theory, the reactor production ability theory, the power design method and the critical rotation velocity theory

本文較全面、系統地綜述了國內外生物質熱解液化制取生物燃油技術研究發展現狀及存在的問題，主要研究內容有： （ 1 ）實驗、測定了20種常見生物質的能量（發熱量）和c 、 h 、 n元素含量，根據實驗結果分別建立了以h和c為自變量的生物質能量預測經驗公式，並通過r _ （ 0 . 05 ）檢驗；為閃速熱解液化裝置能量轉化率計算和生物質能量利用率計算提供了依據和方便； （ 2 ）選擇了8種生物質試樣作了等加熱速率（ 10 min 、 20 min 、 40 min 、 60 min ）和恆溫加熱的tg和dtg實驗，根據實驗數據和阿倫尼烏斯公式建立了生物質熱解反應動力學微分方程，並採用goast - redfem積分法和p函數對其動力學參數進行了求解，解析出各種生物質的頻率因子和活化能參數，進而建立了各種生物質的熱解動力學模型，為科學確定反應器的閃速熱解工作溫度范圍及熱解反應動力學描述，提供了理論和依據； （ 3 ）為研究和確定不同尺度的生物質顆粒中心達到全熱解的時間，在體視顯微鏡下對不同粒度的生物質顆粒的長徑比進行了實驗觀察和測定，得出生物質的長徑比（ l d ）一般在5 . 0 6 . 0之間，平均為5 . 3的結果； （ 4 ）採用復雜溫度場傳熱學理論對生物質傳熱過程及充分熱解時間理論進行了研究，解析推導出了不同尺寸生物質顆粒中心溫度達到充分熱解溫度的時間（ t ） ，得出了理論推導的充分熱解時間與最大產油率的熱解時間相一致的結果，為閃速熱解反應器固相滯留時間設計和預測提供了理論依據； （ 5 ）根據上述實驗結果，綜合運用工程力學、工程材料、機械設計學原理，推導、建立了轉錐式閃速熱解反應器物料滯留時間（ ）與轉速（或頻率）合理匹配理論； （ 6 ）提出了轉錐式閃速熱解反應器的最小錐角設計、錐壁強度設計、生產能力設計理論和功率計算方法及臨界轉速理論等。

Through describing the space sampling process of ccd, the composing factors of modulate transfer function ( mtf ) of ccd integral sampling process are analyzed. meanwhile, an effective method to analyze the mtf of discrete sampling image system is put forward and is used to analyze and compare mtfs of sub - pixel image system and singlechip ccd system. as a result, definitions of ccd optical transfer function ( otf ) and optical mtf are presented and effective methods to measure ccd mtf are brought forward

本文通過對ccd器件空間采樣過程的描述，詳細分析了ccd積分采樣過程調制傳遞函數的構成要素，提出了分析離散采樣成像系統調制傳遞函數的有效方法，並用該方法分析比較了亞像元成像系統與單片ccd系統的mtf ，給出了ccd器件光學傳遞函數（ otf ）和光學調制傳遞函數（ mtf ）的定義，提出了檢測ccd調制傳遞函數有效方法，採用幾種不同測量方法測定了tdiccd的調制傳遞函數，並進行了比較分析。

By describing the function, characteristics and disadvantages of the time editor, the author discusses the method and the thoughtway of improvement, in order to increase the operation efficency of computer aided time table compiling

摘要闡述了廣州地鐵時刻表編輯器的編譯功能、特點及缺陷，探討了該編輯器的改進辦法和思路，以便進一步提高計算機編圖的工作效率。

Theoretically speaking, there are many means to lightening primary product ' s market risk, for example, developing agricultural insurance, developing primary product ' s time - bargain, etc. thus according to the chinese present social and economic condition, improving the peasant systematization and developing peasant cooperated economic organization in the circulating field are the appropriate means to resist primary product ' s market risk, in the first part of this dissertation i have defined the concept of primary product ' s market risk, expatiated the premise term and reason which induces primary product ' s market risk, and described its basic character ; then applied statistical method to analyze primary product ' s market risk china is faced with, and indicated that the primary product ' s market risk has become a dominating risk of the agriculture ; following that, on the basis of describing category, originated mode, management style of the peasant cooperated economic organization in the circulating field, i illuminated its problem and offer the countermeasure ; in addition, i attach a case which can demonstrate the function of the peasant economic organization in the circulating field on the aspect of lightening the primary product ' s market risk

從理論上來說，規避農產品市場風險的手段多種多樣，譬如開展農業保險、發展農產品期貨交易等，但是結合中國目前現實的社會經濟條件，提高農民的組織化程度，發展流通領域農民合作經濟組織才是目前抵禦農產品市場風險的現實途徑。本文開篇對農產品市場風險的概念進行了界定，並詳細論述了農產品市場風險產生的前提條件、形成的原因及其基本特徵；然後運用統計分析的方法對我國目前面臨的農產品市場風險進行了分析，並指出農產品市場風險是現階段我國農業面臨的主要風險；緊接著在闡述農民合作經濟組織的類型、發起方式、經營管理等的基礎上分析說明流通領域農民合作經濟組織可以切實有效地規避農產品市場風險；最後闡明流通領域農民合作經濟組織存在的問題，並給出了對策性建議，另外還附上一個實例說明流通領域農民合作經濟組織在規避農產品市場風險方面的作用。

( 6 ) designing and realizing the prototype - mapcheck software by combing with the need for the digital information engineering of military surveying and mapping to establish series - scale map database ; describing in detail the structure, function and the realization method of mapcheck

（ 6 ）結合軍事測繪數字信息工程建立系列比例尺地形圖數據庫的需要，設計並實現了原型系統? ? mapcheck軟體，對mapcheck的結構、功能、實現方法進行了詳細的論述。

The nonlinear caused by the latter ( usually called nonlinearity in essence ) has been solved by the describing function technique. but to the former, there is no satisfying method

對於後者引起的非線性（通常稱為本質非線性） ，採用描述函數法已能取得較好的效果，而對前者引起的非線性，目前還沒有比較滿意的統一處理方法。

In the case of a pre - loading device or system, a full technical description of the construction and function including any sensing device, describing the method of activation and any necessary method to avoid inadvertent activation

在預載裝置或系統中，應包括全部技術描述，裝置（系統）結構、包括傳感裝置在內的功能描述（驅動方式以及避免疏忽的必要方式） 。