頻閃法 的英文怎麼說
中文拼音 [bīnshǎnfǎ]
頻閃法
英文
stroboscopic method-
Since the target glint is essentially a very low frequency phenomenon whose bandwidth is typically equal to or less than that of the system, it is difficult for a missile to filter it out, or will cause the miss to increase
由於目標閃爍的頻率通常小於或者與系統的頻帶相當，所以導彈無法濾掉此干擾信息，致使系統脫靶量增大。Methods the images of the laryngeal disease and the parameters obtained from the laryngostroboscope were analysed and diagnosed by the multimedia
方法應用多媒體技術分析、診斷頻閃喉鏡圖像及各項檢測參數。Both of algorithms adopt asynchronous sampling, which can save hardware expenses and make the best of the advantages of software. the algorithms, as well as the factors that impacts the measuring accuracy, are analyzed and tested by the simulations on labview platform ; at the same time, the feasibility of the algorithms on labview platform is verified
給出了基於頻譜校正的電氣信號測量新演算法與基於fft分析的閃變計算方法，這兩種測量演算法均是建立在非同步采樣的基礎上，節約了硬體開銷，可以最大限度的發揮軟體的優勢。To compensate for the above shortcomings, a surgical technique is developed at our institute - flexible videolaryngostroboscopic surgery
基於以上理由，我們遂採用一種喉內手術方法在軟式纖維鏡頻閃觀測錄影系統監控下的喉內手術法。Some researches about frequency doubling are made, and two methods to improve intensity of second frequency generation are given. we realized q - switched 532 nm laser, by using nd : gdvo4 as laser crystal, using cr4 + : yag as saturable absorber, using ktp as intra - cavity frequency doubling crystal. average power of 109mw, repetition of 40khz, pulse width of 30ns, pulse energy of 2. 6uj, peak power of 91w are obtained
4 .對倍頻理論進行研究和分析:討論兩種提高二次諧波功率密度的方一法;實驗匕在國內首次實現ld端面泵浦nd : gdvo4 / ktp ，用cr4 + : yag作為可飽和吸收片的綠光激光器，腔內倍頻得到了平均功率為109mw 、重復頻率為40khz 、脈寬為3ons 、單脈沖能量為2 . 6閃、峰值功率為glw的調q綠光輸出。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。Various solutions such as raising response speed of lcd pixels, raising frame frequency, back light blinking, back light scanning, black field insertion and image processing were reviewed
討論了提高液晶像素的響應速度、提高幀頻、背光源閃爍、背光源掃描、插入黑場和採用圖像處理技術等多種解決方法，並對各種方法進行了分析和評論。At last, pointing to the temporal characteristics and the spectral characteristics, this paper discussed the methods for estimating the maximal line velocity ( vmax ) and the glint periods ( tp ) of the hovering helicopter, and then fulfilled the recognition of hovering helicopter using these two message. in chapter 5, the summary of all the works in the paper and related conlusions are presented, and the defects are analized at last, at last this paper demonstrated the d
最後，本文針對懸停直升機旋翼回波的時頻域特點，探討了從回波信號中提取旋翼回波最大線速度v和旋翼回波閃爍周期tp的方法，在綜合利用這兩種信息的基礎上完成了彈載高重頻脈沖多普勒體制雷達對懸停直升機回波信號的識別。The backward scattering field of extended target is approximated as the synthesis of many strong scatter centers on target, and geometric optical method is used in establishing deterministic model of a aircraft in the paper, the model is used to evaluate the performance of frequency diversity in suppressing glint at last
本文將復雜目標後向散射回波近似為目標上若干強散射中心回波的合成，結合幾何光學法得到了某種飛機目標的確定性模型，並用該模型評定頻率分集對角閃爍抑制的改善性能。The features of fire flame and other disturbing phenomena such as area variety, shape variety, edge variety, flame flicker frequency and the whole motion trend have been detailed studied in this dissertation. and the corresponding recognition algorithms have been given
本文詳細地分析了火災火焰和其它一些干擾現象的面積變化規律、形體變化規律、邊緣變化規律、閃爍頻率規律和整體移動趨勢，並且針對于每一種規律都提出相應的圖像識別演算法。The transform uses the scale of the signal to decompose and make self - adapting frequency band partition of the input signals. therefore the amplitude value and the modulating frequency of the flickering signal can be obtained. with the instantaneous frequency in this method, the present study also analyzes the signal in terms of both time and frequency, and thus gets the time at which the flickering signal occurs and terminates
運用該變換從信號本身的尺度特徵出發對信號進行分解的特點，對輸入信號進行自適應的頻帶劃分，從而求出了閃變的調制信號幅值和調制頻率;利用該方法中的瞬時頻率概念，從時頻兩方面同時對信號進行分析，從而獲得了閃變信號的發生時刻和終止時刻，得到了較好的檢測效果。However, most of the current wireless networks still work in low bandwidths, and mobile devices still suffer from weak computational power, short battery lifetime and limited display capability. therefore, this thesis deals with developing a very low bit - rate bi - level video coding technique, which can be used in video communications almost anywhere, anytime on any device as follows : ( 1 ) convert true color video sequences from ccd and video card to grayscale ones, ( 2 ) detect static region of successive frames by the sum of absolute differences ( sad ) and update current frame using static region of previous frame, to decrease flicker. ( 3 ) threshold the images to bi - level video sequences using ridler ' s iterative selection
為此，本論文在傳統h . 26x和mpeg - x等視頻編解碼技術的基礎上提出了一種新的基於輪廓的視頻編解碼方案，步驟如下： （ 1 ）先把從ccd攝像頭捕捉到的視頻幀序列轉換成灰度幀序列， （ 2 ）在灰度幀序列的基礎上通過sad演算法找出相鄰幀的靜態區域，用前一幀的靜態區域更新當前幀的相應區域，這樣可以降低畫面閃爍， （ 3 ）然後用灰度直方圖迭代所產生的閾值二值化圖像，生成基於輪廓的視頻幀序列， （ 4 ）最後運用基於上下文的算術編碼技術對由第三步生成的二值化視頻幀序列進行算術編碼。As iec flickering measurement method can only be applyed to analyze stable flickering signals, this paper applies hilbert - huang transform, the latest time - frequency analyzing method, to deal with the non - stationary flickering signals
針對iec閃變測量方法僅適用於分析平穩閃變信號的不足，本文應用最新時頻分析方法hilbert - huang變換來分析非平穩閃變信號。Recently, there are some methods are utilized to study it, such as the modified lindstedt - poincare method, frequency - incremental method, stroboscopic method etc. more and more, scientists pay attention to it, as the study of solving partial differential equation is very important for the development of mechanics
目前主要的近似求解方法有改進l - p方法、頻率增量法、改進的諧波平衡法、頻閃法等等。由於求解偏微分方程對于力學的發展起了很重要的作用，求解偏微方程特別是非線性偏微分方程引起了很多力學工作者的注意。In order to get suitable algorithms which are accuracy, feasible, practical and convenient to be realized by virtual instrument, this paper firstly analyzes measuring algorithms of major power quality parameters, such as voltage, current, frequency, harmonics, flicker, unbalance factor etc. then two algorithms, the one for basic power quality parameters measurement based on spectrum correction and the other one for flicker measurement based on fft, are presented
基於虛擬儀器技術的電能質量測試儀應用靈活，升級方便， 「軟體就是儀器」的特色使測試儀各種通用功能和預期功能的方便實現成為可能。文章對電能質量的一些主要指標:電壓、電流、頻率、諧波、電壓波動和閃變、三相電壓不平衡度等的測量演算法進行了分析，尋求適合虛擬儀器實現的，切實可行、計算精確、實用性強的計算方法。A team from france and the netherlands set a new speed record for subdividing the second, reporting last year that a laser strobe light had emitted pulses lasting 250 attoseconds ? that ' s 250 billionths of a billionth of a second
去年，法國與荷蘭合組的研究團隊創下新紀錄，根據他們報導，一束頻閃雷射光發射的脈沖，只持續了250阿秒（ 10 - 18秒） 。The study on query system using the basketball video fragments as an example is involved in such areas : first, in the condition of " video - flash " and " jump " phenomenon, the " two - level video segmentation algorithm " solves the mistaken detection of the shot edge ; second, the part or the whole video as the result of detection can be well played ; third, the text on the complex background can be detected and fixed, not only the speed but also the right proportion have been improved ; forth, the text can be divided into " regular detection " and " irregular detection "
本課題以籃球比賽的視頻片斷為例，主要進行了以下幾個方面的研究： 1 ）針對視頻中的「閃動」和「急跳」現象，提出了「二級鏡頭分割演算法」 ，解決了鏡頭邊緣的誤識別問題。 2 ）對所檢測出的視頻片斷或整個視頻流進行播放。 3 ）基本解決了復雜背景下文字檢測與定位問題，提高了數字的識別速度與正確率。Conclusion it is a better method of diagnosing laryngeal disease that the laryngostroloboscopic image is analysed by multimedia
結論應用多媒體技術對頻閃喉鏡圖像進行分析是診斷喉病的較好方法。Then the paper presents two important concepts on wavelet transform : multi - resolution analysis and wavelet package analysis. last, the paper introduces the application of wavelet transform on power quality analysis, especially on the research of voltage flicker. we can get the magnitude and frequency of the embed signal by mra
最後介紹了小波變換在電能質量分析中的應用，重點討論了電壓閃變問題，用小波多解析度分解和子帶濾波方法對電壓閃變的包絡信號進行分解，檢測出包絡信號中的各個頻率分量及其幅度。分享友人