length ratio 中文意思是什麼
length ratio
解釋
長度比例」-
And then facing the problem of the channel estimation of the adaptive modulation system, we conclude out the channel estimation algorithms on maximum likelihood ( ml ) estimation and maximum a posteriori ( map ) estimation under the condition of flat fading channel and selective fading channel in detail. to meet flat fading channel, we simulate the relationship of the ratio between the error covariance in map estimation and ml estimation and pilot symbol message length. the conclusion can be drawn from these results
接著，對自適應調制系統中的通道估計問題難點，詳細推導了平衰落通道條件下和選擇性衰落通道條件下最大似然（ ml ）估計和最大后驗概率（ map ）估計演算法，針對平衰落通道，我們模擬了map估計和ml估計的方差與導頻符號長度的關系，模擬結果表明，錯誤方差受多譜勒頻率的變化影響最大，並且對實際的自適應調制系統，導頻符號長度的取值超過20個符號長度時， map通道估計明顯優于ml通道估計。 -
In this paper, the relation between differential driven ratio accuracy and the common normal length error of cylindrical bevel wheel has been found by experimental method, which provides a efficient way for cylindrical bevel wheel manufacturer to control the common normal length error of the wheel
摘要通過實驗研究，尋找出差動傳動比的精度與斜齒圓柱齒輪的公法線長度誤差的關系，從而為斜齒圓柱齒輪的加工提供一個可以控制斜齒圓柱齒輪公發線長度誤差的有效方法。 -
Plants growing in the semi - fixed sand dunes, on the other hand, were less branchy with a larger number of first - year shoots which were longer, and grew faster ; their leaves were longer and wider with a low length / width ratio. the characteristics of the branching system and leaf dimensions of the plants in fixed sand dunes were rather intermediary between those of the above. the frequency distribution and their frequency in the herb layer the scrubs also varied with habitats
丘間低地的黃柳灌叢當年枝平均長度增加緩慢，短枝條的比例較高，當年枝枝長頻度分佈峰值偏左，葉片短而狹，長寬比大；與之相比，分佈於半固定沙丘的灌叢當年枝平均長度增加較快，長枝條比例較高，葉片長而寬，長寬比小；固定沙丘上的上述特徵大致介於二者之間。 -
For increasing the effective material peak - value power ( empvp ), solving the contradiction between enhancing the pmsm ' s flux - weakening capability in the electromotor state and reducing the pmsm ' s connatural adjustment ratio in the dynamotor state and improving the efficiency of the pmsm, some solving method are taken as follows : the influence of length / diameter ratio to the empvp is analyzed, and the optimum size of length and diameter is chosen
主要是從提高電機的有效材料峰值功率、解決pmsm提高電動機運行狀態時的弱磁擴速能力和減小發電機運行狀態時的電壓調整率之間的矛盾及提高電機的效率著手，分析了長徑比、氣隙長度對有效材料峰值功率的影響，並確定了它們的最佳尺寸。 -
Among myopic eyes, the incidence of conus formation and surface ratio of conus to disc increased as the myopic degree or the ocular axial length increased
近視眼中，圓錐形成的發生率和圓錐和視神經盤比值皆依近視程度或眼軸長之增加而增加。 -
Since the discovery of cnt ’ s and find that cnts have small diameter and high length diameter ratio and can be look as one - demission material, it can be used as emission emitter of fed. especially, the aligned cnts array can be seen innumerable single cathodes which are lined regularly and form array. so growing aligned cnts array in selective area is the key technology to product cnts fed, which is also the necessary condition of cnts micro - electronics device
自碳納米管發現以來，由於碳納米管的直徑很小、長徑比大，故可視為準一維納米材料，可作為場發射平板顯示的尖端發射體，特別是定向碳納米管陣列可看成是無數根單尖陰極規則的排列起來形成陣列式，是理想的場發射平板顯示器的尖端發射體。 -
The effect of exit back pressure and length / height ratio of isolator on forebody / inlet flow field is analyzed and discussed in the paper
本文還研究了隔離段出口反壓及隔離段長高比對進氣道流場的影響。 -
In the sub block circuit design, the contents that the author had introduced include : the principle of band gap voltage reference and the design technique in low power supply ; the analysis of spike pulse noise rejection, frequency divider and dead time in oscillator and control circuit ; the selection of the width and length ratio of four switches and 2x / 1x mode change point in driver and mode selection circuits
在子電路設計中，作者比較深入分析的內容有:基準電路的原理及低電源電壓下基準電路的設計;振蕩器和控制電路中尖峰脈沖噪聲抑制、兩分頻電路及死區時間設定;驅動及模式選擇電路中開關管的寬長比的選擇及模式轉換點的設計。 -
This paper presents the structural design of the main bridge of lhasa river bridge, makes a deep - going study of the key techniques for design of the bridge, such as the reasonable span length ratio of each span of the 5 - span girder and arch hybrid structure, mechanical behaviour of the dual arch ribs, and section of the continuous girder tie beam, and also works out rigidity and stress conditions of the continuous girder tie beam and stress conditions of the concrete - filled steel tube arches of the main bridge
摘要介紹了拉薩河特大橋主橋結構設計情況，對於五跨梁拱組合橋梁各孔跨合理的跨度比、疊拱的受力行為及連續梁系桿截面形式等設計中的關鍵性問題進行了深入的研究，給出了主橋連續梁系桿的剛度和應力情況、鋼管混凝土拱的應力情況。 -
Contact pressure, hysteresis and no - even pressure ratio of no - gradual - enlargement finger seal under different length ratio and root circle of no - gradual - enlargement finger seal are constructed and analyzed, rules are summarized
本文對非漸擴形結構指尖密封在不同寬度比和根圓外徑下的接觸壓力、遲滯率及偏載率等特性進行了作圖、分析，得出了相應的規律。 -
The varied rule of increment ( the equation is abbreviated ) of water depth - wave length ratio shows that wave length decreases with a complicated process, related with increasing density of wave energy
水深波長比差值（方程式略）的變化規律反映出淺水波長縮減為一復雜過程，並與波能密度加大相關。 -
Through developing a 2 - dimensions heat transfer model of buried pipe - in - pipe heat exchanger and simulating the process by computer, the author figures out inter - relations of factors which influence characteristics of buried pipe - in - pipe heat exchanger, such as pipe diameter, pipe length, ratio of pipe diameters, flow rate, inlet water temperature, patterns of water inlet and outlet, and material features made of pipe, and proposes some optimizing indexes of buried pipe - in - pipe heat exchanger. the author studies the " heat - - short circuit " phenomenon as well and gives < wp = 5 > some important results
本文通過建立地下套管式埋管換熱器傳熱過程的二維傳熱模型，並藉助計算機對分析結果進行解析，弄清了影響埋管換熱器性能的管徑、管長、管徑比、通過流量、進水溫度、進出水方式以及管材等參數的作用，並提出了相應的優化指標，對研究界懸而未決的「熱短路」問題也進行了細致分析，得出了有關結論。 -
Based on analysis and comparison of existing test data applied to existing ultimate strength prediction models, interfacial stress at the end of plate is deduced. after formulas for calculating the effective moment of inertia for frp - strengthened beams being revised and adjustment coefficient related to nominal main steel reinforcement ratio and curtailment length ratio being put forward, strength prediction formulas of compound beams under plate end debonding failure are established. in analysis of strength of compound beams under intermediate crack induced interfacial debonding failure mode, several bond strengths and their relation are introduced
對于板端剝離破壞，在總結現有承載力模型的基礎上，利用已有試驗數據對各承載力計算公式進行了分析比較，進一步採用分階段分析法，推導了板端界面應力的計算公式，在此基礎上，採用加固復合梁有效慣性矩的修正公式，建立了考慮名義配筋率和板端偏移比影響的板端剝離破壞梁承載力的計算公式；對于跨中受彎裂縫導致的粘結破壞，闡述了常見的幾種粘結強度之間的區別和聯系，並基於拉剪粘結強度，提出了跨中受彎裂縫導致粘結破壞的承載力計算公式，並利用現有試驗結果確定了模型中的一些參數；最後，利用試驗數據對本文建立的兩種粘結破壞承載力計算公式進行了檢驗，結果基本吻合。 -
Abstract : in the light of the problem of multiple variables restrain in the design of pipe heat exchanger, it is proposed taking three variables, the pipe length, ratio between the table flap space and the shell outer diameter, and ratio between the pipe space and the pipe outer diameter, as optimization criterion
文摘:針對管式換熱器設計過程中幾何關系的多自變量約束難題，提出了以管長、折流板間距與殼外徑之比、管間距與管外徑之比三個設計變量作為優化判據。 -
Based on the existent well pattern and fracture azimuth of xinzhan oilfield, this paper establishes the numerical simulation model of fracture reservoir, and calculates the effect of fracture length ratio and fracture flow conductivity of hydraulic fractured injection wells and production wells on the reservoir development index
摘要依據新站油田現有井網和裂縫方位條件，建立了帶裂縫的油藏數值模擬模型，計算出實施水力壓裂的注水井和採油井縫長比及裂縫導流能力對油藏開采指標的影響。 -
In this paper, firstly, monolithic materials cosb3 and bi2te3 were prepared by sparkle plasma sintering ( sps ) respectively, and at the same time the microstructure of cosb3 and bi2te3 were studied by sem ; the seebeck coefficients and electrical conductivities of monolithic materials were measured by standard - four - probe method ( ulvac zem - 700 ) in a he atmosphere simultaneously, and their thermal conductivities were investigated by laser flash method ( tc - 7000 ) in vacuum. secondly, the junction temperature of graded bi2te3 / cosb3 thermoelectric materials was optimized based on the thermoelectric transport properties of monolithic materials, also when graded materials were used in the temperature difference ranging from 300k to 800k, the length ratio of monolithic materials cosb3 and bi2te3 were optimized in theory. thirdly, graded bi2te3 / cosb3 thermoelectric materials were prepared by two - step sps sintering, and the relationship between its average seebeck coefficients and temperature were calculated by theory mo del
均質材料cosb _ 3和bi _ 2te _ 3的電導率和seebeck系數採用標準四端子法于he氣氛下在zem - 1上同時進行測量；熱導率採用激光微擾法（ tc - 7000 ）于真空狀態下進行測量；其次，在對均質材料cosb _ 3和bi _ 2te _ 3熱電傳輸特性研究的基礎上，對結構梯度bi _ 2te _ 3 cosb _ 3熱電材料的界面溫度進行了優化；為了使結構梯度bi _ 2te _ 3 cosb _ 3熱電材料在300k至800k的溫度范圍內具有最佳的熱電性能，本研究同時對梯度結構熱電材料當中均質材料cosb _ 3和bi _ 2te _ 3材料的長度進行了優化設計；第三，通過兩步放電等離子燒結的方法制備出了結構梯度bi _ 2te _ 3 cosb _ 3熱電材料；採用理論計算的方法研究了梯度結構熱電材料平均seebeck系數和溫度的關系；同時為了驗證設計的結果，本論文對結構梯度bi _ 2te _ 3 cosb _ 3熱電材料的開路輸出電壓和熱端溫度之間的關系及梯度材料在300k至800k的溫度范圍內使用時的功率輸出進行了相應的研究。 -
In order to research the aerodynamic characteristics of grid fins effected by width to length ratio, the grid fins of three hight to width ratios were adapted in wind tunnel experiments at subsonic, transonic and supersonic speeds
為研究它對柵格翼氣動特性的影響規律，本研究採用風洞實驗的方法對3種不同格寬翼弦比的柵格翼在亞、跨、超聲速3個馬赫數下進行了氣動特性的研究。 -
Height, crown amplitude, size of leaves, leaf number, diameter of root, biomass of leave, biomass of root, total biomass and relative growth rate ( rgr ) of c. smyrnioides were all increase with soil water. but it was decreased with soil water for specific leaf area ( sla ), leaf area ratio ( lar ), specific root length ( srl ) and root length ratio ( rlr )
明黨參株高和冠幅、葉片形態大小、葉片數、根粗、根體積、葉生物量、根生物量、總生物量和rgr均隨著土壤水分的增加而增大，而sla 、 lar 、 srl和rlr則隨著土壤水分的增大而減小。 -
We also discuss the design of cavity that is used in experiment 、 means for how to stir electromagnetic wave and choice of diameter / length ratio for cavity. final, we have made an experiment to cigarette with apparatus made up of vector network analyzer ( vna ) and cavity that is designed by ourselves, regressed the equation with matlab software, analyzed measurement errors, put forward some means that reduce measuring error
最後，使用自己設計的諧振腔和矢量網路分析儀搭成的實驗裝置對卷煙進行了密度測量實驗研究，並用matlab軟體對測量數據進行了回歸擬合，建立了密度測量的方程，並對測量誤差作了分析，提出了進一步減小誤差的途徑。 -
So a new method is presented ( equivalent damping of pile lateral damping ) to realize the analysis of integrity pile in soil. in this method, the coefficient of the damping is calculated by the length ratio of each pile in a soil layer to the whole pile in the heterogeneous soil. and through much calculation by use of matlab program, the equivalent damping in the heterogeneous soil is proved to be correct
提出了採用加權的方法對成層土中樁側土阻尼系數進行等效簡化的概念，即把各層土阻尼系數乘以該層土中樁段長度占樁身總長的比值（即為加權系數） ，然後相加即得到一個等效阻尼系數。
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