f-ratio f 中文意思是什麼
f-ratio f
解釋
比；變方比-
In the self - calibration scheme, the thesis emphasizes the accuracy of camera intrinsic and extrinsic parameters. we presents an accurate f method based on corresponding point adjustment. the method adjusts coresponding points according to the fixedness of projective transformed cross ratio, then calculates f matrix accurately through linear and non - linear methods. when computing intrinsic parameter, a matrix, we simplify the step, and stress on the two important parameters of a. the result will be getten through solving kruppa equation based on svd decomposition. in order to compute extrinsic parameters, we use linear method to get initial r and t, then apply non - linear method to accurate them
提出了基於匹配點調整的f求精方法，先根據攝影交比不見性對手工選擇的匹配點進行調整，再用線性、非線性結合的方法求精f矩陣；在計算內部參數a中，進行了一定的簡化，把重心放在a中重要的兩個參數上，用svd分解法計算kruppa方程；在計算外部參數時，首先用線性法求解r 、 t ，然後再用非線性法迭代求精。 -
Analysis f k and na in nepheline were curried out with higher precision and repeatability by means of adding fluohydric acid during sample melting to remove sio2, adjusting the ratio of k and na in the solution to reduce the mutual interference of the two elements, and adding cesium chloride to eliminate ionization interference
摘要本方法用於測定霞石中的鉀、鈉，主要通過在溶樣時加入氫氟酸除去二氧化矽，調整溶液中鉀、鈉的含量，消除互相之間的干擾，加入氯化銫消除電離因素的干擾，提高了分析結果的準確性和重現性，使測定結果更接近化學分析值。 -
The following results are obtained : ( 1 ) the flow in rotating helical pipes are affected by dean number, curvature, torsion ( or germano number ), the ratio of the coriolis force to the centrifugal force f number ( or rossby number ) and the geometry of the cross section
研究結果表明： （ 1 ）旋轉螺旋管道流動特性受dean數、曲率、撓率（或germano數） 、科氏力與離心力之比f數（或rossby數）以及截面的形狀五種因素的影響。 -
This experiment studies the relation of ionic current signals and a / f ratio on different premixed pressure
通過控制預混壓力和空燃比兩個參數變化，消除了由於發動機循環變動對燃燒狀態和離子電流強度的不穩定影響。 -
The results show the ionic current signals can be used to detect the a / f ratio, which provide the basis investigation for the application of ionic current in engine
分析了空燃比、預混壓力變化與離子電流信號的關系，試驗研究表明離子電流法可用來檢測空燃比，為在發動機上的應用提供了基礎性研究。 -
Experiments show that, when use msp430f149 audio sensor to identify vehicles that contain plane, tank, truck and so on by time domain features and two - level f - ratio, the recognition rate is 82. 1 % ; when use both msp430f149 audio sensor and arm9 sensor to identify vehicles, and the recognition rate is much better than the original system and msp430f149 audio sensor. line spectrum of power spectra and 3 / 2 spectrum is used as frequency features on arm9 sensor, and it is caught by narrow - band bandpass filter
實驗證明，在主頻為8mhz的msp430f149感知器上，採用基於時域特徵和二階f比的識別演算法，能夠實時地完成對飛機、坦克、卡車等交通工具的識別;將msp430f149感知器與基於arm9的高端感知器配合使用，且高端感知器採用功率譜線譜或3 / 2維譜線譜作為頻域識別特徵，能夠實時的對各類交通工具做更高性能的識別。 -
The authors discuss from 12 different angles the effect of the clinical use of drugs on drug funds and point out that all of the following factors affect drug funds to varying degrees : distribution of the sum of money for the drugs the pharmacies receive, the ratio between sel f - paid drugs and costly drugs, inpatients ? length of stay, the nature of drug expenses with regard to the patients, the occurrence of hospital infection and c omplications, the need of inpatients in convalescent wards for drugs, the struct ure of drugs used in key drug - using departments, centralized drug consumption, preventive use of drugs by patients after operations, doctors ? habit in their p rescription of drugs, and the proportion of antimicrobial agents in the amount o f drugs used
作者從12個不同的角度探討了臨床用藥對藥品經費的影響，指出藥房領用藥品的金額分配，自費藥品和貴重藥品的比例，病人的住院天數，病人的費別身份，醫院感染和並發癥的產生，康復病房住院病人對藥品的需求，重點用藥科室所用藥品的結構，集中藥品消耗，術后病人預防用藥情況，醫生的用藥習慣，抗菌藥物在藥品中所佔的比例等都不同程度影響著藥品經費。 -
The relations between the parameters of gas charging and exhausting, heat quantity through the shell of tube ( q ), the length of the tube ( l ), the ratio of gas charging time to gas exhausting time ( ), the frequency of the jet flow ( f ), the ratio of the expansion ( ), the nature of thermal separator and the unsteady flow in the tube were established
建立了進、排氣參數、管壁散熱量（ q ） 、管長（ l ） 、充、排氣時間比（ ） 、射流頻率（ f ） 、膨脹比（ ）等參數與熱分離機性能及管內非定常流動的關系，並分析了有關因素對熱分離機性能的影響。 -
F ) to retreat cultivation 1. 467 million ha for reforestation or recovering grass. g ) attheend, to adjust the proportion of cultivated land, forest, grassland from 7 : 6 : 1 to 1 : 1. 4 : 1. 2, this proportion is reasonable ratio for land use structure. for getting the above strategy targets, we must handle of the following relations : a ) the relation between development and environment protection ; b ) the relation between population and land resources ; c ) the relation between construction and farmland protection ; d ) the relation between quality and quantity of farmland ; e ) the relation between land using and economy development ; f ) the relation between land exploitation and landscape worth maintaining, etc. for getting the above strategy targets, we must also adopt some good measures : a ) to control the construction occupying farmland ; b ) to use land intensive ; c ) to improve low - yield farmland ; d ) to make regional land resources distribution effective ; e ) to make comprehensive profit ; f ) to make family planning continually ; g ) to promote urbanization, etc. by carrying out these measures, land resources in shanxi province can be used sustainable
同時，論文對土地資源利用潛力和未來趨勢進行了科學推理，提出了山西土地資源永續利用的戰略目標：到2015年，全省耕地面積穩定在433 . 3萬公頃左右，基本農田面積保持在366 . 7萬公頃左右，保證糧食產量100億千克；各項建設用地控制在14 . 2萬公頃，其中佔用耕地在7 . 9萬公頃，土地開發、復墾、整理補充耕地10萬公頃，改造中低產田10萬公頃，治理水土流失面積1 . 13萬公頃，發展園林草地146 . 667萬公頃（含退耕還林還草99 . 2萬公頃、園地6 . 7萬公頃） ；經過長期努力，使林草地總面積達到865 . 6萬公頃，耕地、林地、草地比例由現在7 6 1逐步調節到1 1 . 4 1 . 2較合理的比例。 -
In this thesis, we have mainly studied the characteristics of chf3, c6h6 and cf4 electron cyclotron resonance ( ecr ) plasma using langmuir probe and optical emission spectroscopy ( oes ). the relative concentration of different radicals in chf3 plasma and the effect of chf3 / c6h6 ratio on bond configuration of a - c : f films were discussed. it was showed that h, f, c2 were the main radicals among radicals of h, f, c2, ch and f2 in chf3 ecr plasma
重點研究了chf _ 3 、 cf _ 4和chf _ 3 c _ 6h _ 6放電等離子體中基團的分佈；分析了不同基團的相對密度隨宏觀放電條件（微波輸入功率、放電氣壓、源氣體流量比）的變化規律；探討了等離子體中各種基團的生成途徑；在不同源氣體流量比的條件下沉積了a - c ： f薄膜並通過傅立葉變化紅外吸收光譜（ ftir ）的測量得到了薄膜中鍵結構的信息；分析了a - c ： f薄膜的沉積速率及其鍵結構與等離子體空間基團分佈狀態之間的關聯。 -
F a fuel - air ratio
燃油空氣混合比 -
For better performance on emission, there is an electronic device to loop control a / f ratio
為了改善排放效果，增加了空燃比電控系統，閉環控制空燃比。 -
Abstract : from the equilibrium and continuity conditions of wave impedance boundary of stress wave and velocity, wave, the paper derives the expressions of reflection coefficient and transmission coefficient of stress wave and velocity wave, further, discusses the characteristics of f - v curves at different impedance ratio, and analyzes the application of these characteristics to ascertain the defects of pile and soil resistance distribution around pile by practical engineering examples
文摘:該文從力波及速度波在波阻抗界面的平衡及連續條件，推導了力波、速度波的反射系數、透射系數表達式，進而討論在不同阻抗比時的f ? v曲線特徵，並引用幾個工程實例對應用這些特徵判定樁身缺陷及樁周土的阻力分佈進行了分析。 -
The ratio f / c decreases with the increase of power, but increases when pressure increase. the power has more marked effect on f / c than that of pressure. contact angle of fluorocarbon films obtained at different of power, pressure and treating time
最後研究了不同功率、壓力、濺射時間對氟碳膜憎水性能的影響，並測量了氟碳膜的接觸角，發現接觸角隨功率的增加而減小，隨壓力的增加而增大。 -
While the scientific technology developing at a tremendous speed, the level of hydro - generator manufacturing is increasing. now the f - class insulation standard for generator is adopted, and cad for hydraulic design has spread, and advanced theory in hydraulic design is applied, and insulation materials are discovered, and precise processing techniques are under research. in the hydroelectric industry it ' s necessary to increase the generating units " installed capacity to take advantage of an old power plant and to raise the utilization ratio of water power energy
隨著科學技術的飛速發展，水力發電機的生產製造水平日益提高， f級絕緣在電機中的運用；計算機cad輔助水力設計的推廣，先進的水力設計理論的應用，新的電氣絕緣材料的發現，精密的加工工藝的研究，為了提高水能利用率，使老電站煥發青春，機組增容改造已是水電事業發展中一項不容忽視的工作。 -
The research of propellant energy performance indicates that the special impulse and characteristic velocity are significantly depended on o / f ratio and weakly depended on chamber pressure
過氧化氫和pe燃料組合的能量研究表明：發動機的比沖和特徵速度與配比密切相關，與燃燒室壓強關系不大。 -
The simulations results show that the average combustion temperature is much lower in fuel - rich state and little higher in oxygen - rich state near the best o / f ratio. by extending the post - chamber length the oxidizing gas and the fuel pyrolytic gas can burn completely and the average combustion temperature can be prominently increased. the fuel - rich recirculation zone close to the head of combustion chamber is very important for the combustion
計算結果分析表明：發動機在富燃狀態下平均燃燒溫度偏低，在接近理想配比的富氧狀態下平均燃燒溫度有所提高；加長補燃室可以大幅度提高發動機的平均燃燒溫度，並促進氧化劑氣體和熱解氣體的充分燃燒；燃燒室頭部的富燃迴流區對發動機的燃燒非常重要，去掉燃燒室頭部突擴段后，氧化劑氣體和燃料熱解氣體不能充分燃燒，發動機的平均燃燒溫度大幅下降。 -
The motor special impulse can be enhanced with the best o / f ratio reduced by increasing the concentration of hydrogen peroxide or adding aluminum powder in the fuel
提高過氧化氫濃度或在燃料中添加鋁粉可以降低最佳配比，並提高發動機的比沖。 -
Then it was used to estimate self - purification capacities, environmental capacities, surplus environmental capacities, budgets, and residence times of din and po4 - p in jiaozhou bay. new production and f ratio in jiaozhou bay were also discussed by application of the model
應用該模型對膠州灣din和po _ 4 - p的自凈容量、環境容量、剩餘環境容量、收支狀況、逗留時間以及膠州灣的初級生產力、新生產力和f比值進行研究，主要結論如下： 1 -
The results of research indicate that the pressure, the thrust and the fuel regression rate of the motor decrease while the o / f ratio increasing with the burning time lasting. the special impulse reduces when throttling
研究結果表明：壓強、推力和燃料退移速率隨發動機工作時間增加而降低，氧化劑和燃料的配比升高；節流時，發動機比沖降低。
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