頻率下降 的英文怎麼說
中文拼音 [bīnlǜxiàjiàng]
頻率下降
英文
decrease of frequency-
( 2 ) gene flow frequency was reduced as distance from pollen donor increased and a dramatic reduction occurred at about 2 meters. the maximum distance where gene flow was not detected was 50 m for hybrid rice while it was 70 m for ms lines, with an exception that in one of the four ms lines it was detected a frequency of gene flow 2. 8 + 10 - 6 at 150 m for zhong 9a
在開花期主流風向ne的風速為0 . 2 ? 2 . 2m / sec的條件下， 2個雜交稻品種的最大漂流距離為40m ； 4個不育系的基因漂流基本上到60m為止， 70m處基因漂流頻率均降為0 ，僅中9a在150m處發現了1株basta抗性苗，經pcr檢測驗證為陽性。Spatial distribution and time scales of atmospheric diffusion over beijing area are revealed by means of a random walk simulation model and practical meteorological data with a specified emission source from the city. results show a southward transport pattern for wintertime while a northwest transport of pollutants in summer. the area is the least evidently influenced by the emission source in spring, while the largest in autumn. the time spent for instantly emitted material removing from the model domain varies from winter - spring to summer - autumn. the former was shorter one of less than 20 hours ; the latter was longer one of approximately 30 hours. distribution of occurrence probability for different removal times was not symmetry. reducing slowly at the end of longer removal time, probability exists for pollutants remaining in this area a long time
結果表明，冬季示蹤物偏南夏季偏西北的輸送明顯春季擴散影響范圍最小秋季最大。示蹤物從200km200km模式區域輸出的平均時間去除時間明顯分為冬春季和夏秋季兩組，前者較小，平均在20h以下，後者較大，平均約30h 。不同去除時間出現的頻率分佈是非對稱的，在長去除時間一側，出現頻率下降緩慢，顯示污染物有在該區域內長時間滯留的可能。The research result indicated : for the strip primary mirror discussed in this article, the hexagon light - weighted cell has the best structural rigidity quality, the square cell is a little worse, the triangle cell is the worst ; there is an optimum on primary mirror thickness ; on condition of 1g gravity load combining with 4 centigrade uniform temperature rising, the thinner and higher of the flexible support reed, the better of the primary mirror surface figure. the decision of the structural parameters of the flexible support reed must take static rigidity, dynamic rigidity, static strength and dynamic strength of primary mirror assembly into account
研究結果表明：對于本文的長圓形主鏡，採用正六邊形輕量化孔，鏡體結構剛性品質最好，正方形次之，正三角形最差；主鏡鏡體厚度存在最佳值；主鏡組件在1g重力、均勻溫升4共同作用的工況下，主鏡柔性支撐簧片厚度越小、高度越高，主鏡綜合面形誤差（ p - v值）越小，但同時主鏡組件的剛體位移增大、固有頻率下降，因此柔性支承結構參數的確定要綜合考慮主鏡的綜合面形誤差和主鏡組件靜態剛度、動態剛度、靜態強度和動態強度等因素。In the distribution system, many capacitor banks are applied to decrease the loss of the network. the harmonic resonance may be incurred between the network and the capacitor banks in the harmonic frequency, thus the security of the system may be destroyed because of the high harmonic distortion level
配電網中裝設了大量的電容器進行無功優化來降低網損，但在諧波頻率下，容易產生系統與電容器之間的諧波諧振或諧波放大，從而使系統的諧波畸變率變大，破壞了系統的安全運行。Taking the natural frequency arid the ratio of frequency drop as input characteristic parameters, crack damage in the cylindrical supporting shell of a portal crane is diagnosed and its length and position are forecasted, applying finite element emulation and artificial neural network technologies
摘要應用有限元模擬技術和人工神經網路模型，以反映結構損傷程度的固有頻率和損傷的頻率下降率作為神經網路輸入的特徵參數，對門座起重機筒形支柱上出現的裂紋損傷長度和位置進行了綜合診斷和預測分析。Testing results indicated that in the state of serviceability, the members ’ natural frequencies and dynamic - stiffness are descent because of damage. and the degree of damage can be detected by the descent degree of natural frequencies and dynamic - stiffness
試驗結果表明，梁損傷后固有頻率和剛度均有所下降，建議可對不同荷載下構件頻率下降程度進行分析與總結，進而由固有頻率下降程度來診斷結構的損傷程度。Our results suggested the accumulation of ft in muscle was not the only factor that affected " spectrum shift " during muscle fatigue. the decline of the firing rate of motor units, the synchronization of motor units and an inadequate cns drive may be the important mechanisms that attributed to the change of semg signal during isometric contractions
本研究認為肌肉疲勞過程中h ~ +濃度升高不是導致肌電功率譜曲線左移的唯一因素，運動單位放電頻率下降、中樞驅動減弱和運動單位活動的有序性或同步化可能是肌肉活動時肌電信號變化的一種重要機制。The temperature dependence of dielectric constant between room temperature and 500 under 1 khz, 10khz 100khz frequency conditions were measured, it is found that the ceramics are relaxor ferroelectric. the relaxor properties are decreased by the substitution of ba2 +
測量了各樣品在1khz 、 10khz 、 100khz頻率下從室溫至500的介電溫譜，表明材料為弛豫鐵電體， ba ~ （ 2 + ）的摻入使其弛豫特性有所降低。Then the general plan of underwater vibrators is put forward. in chapter 3, combining fluid - solid coupling theory and mechanical vibration theory, we get the coupling equation of moving parts and water. the dynamic characteristics of moving parts are studied with theory of finite element, and additional mass of moving parts is found in fluid - solid coupling field, which makes vibrator ' s natural frequency descend and amplitude - frequency curve downward shift
第三章運用流固耦合理論和機械振動學理論相結合的方法建立運動部件與水的耦合運動方程，利用有限元法對其的動態特性進行了研究，得到了在流固耦合場下運動部件存在的附加質量，該附加質量導致固有頻率下降，單位推力下的加速度頻響曲線整體下移。Consider the fact that natural frequency can reflect the structure entity performance but cannot be sensitive to the structure local damage identification. in many cases, structure damage in deferent location can cause almost the same decrease in low frequency, so this method cannot ascertain the definite damage location
考慮到固有頻率能夠反映結構的整體性能，但對結構中局部微觀損傷的識別不靈敏，在很多情況下，結構中不同位置的損傷引起的結構低階頻率下降幾乎相同，因此用頻率參數很難準確確定結構損傷位置。A new method based on the frequency decrease rate for fast identification of site liquefaction from surface acceleration records was presented
摘要提出了一個以頻率下降率為基本指標的依據強震記錄快速識別場地液化的新方法。Thirdly, considering when acoustic wave with a certain frequency or angle is incident upon plates, it will greatly cause the radiation power " translating. this paper details the causes of coincident effect and gets the calculating formula. the conclusion is resulted that thick plate and uniaxial anisotropies can lower critical frequency
針對聲波入射板面時在某一特定頻率或特定入射角度時會使聲輻射能力大大增加並產生聲能的大量透射這一現象，詳細討論了產生吻合效應的條件；並針對工程實際中所應用到的各種尺寸、材質的板分別推導了其吻合頻率和臨界頻率的計算公式，得出了厚板和材料的各向異性均會使結構的臨界頻率下降的結論。So the range finding system can maintain a high resolution at low frequency. therefore it can decrease the difficulty of design and the cost
時間線性展寬技術可以在較低的工作頻率下實現較高的測量精度，從而降低了電路的設計難度和成本。There were multiple falls, multiple times that humans went from paradise to paradise lost
有多次（頻率）下降，有多次人類從天堂出發又失去天堂。The liquefiable site was simplified as a double - degree - freedom model and the formula for calculating the reduction of horizontal natural frequency induced by liquefaction was attained
將可液化場地簡化為雙質點模型，給出了液化導致場地水平自振頻率下降的計算公式，推導出了頻率下降率的下限值。Thinning the crystal grain and increasing the center vent are effective approach to raise the limiting frequency of high permeability mnzn ferrite. through large quantities of experiments, we made progress in raising limiting frequency of high permeability mnzn ferrite. we prepared the broad band mnzn ferrite of which the initial permeability was 10000
通過採用上述實驗中的優化配方、添加劑組合以及制備工藝，我們在高磁導率材料的寬頻特性方面取得了很大的進展，研製出了起始磁導率磁導率為10000的寬頻mnzn鐵氧體材料，當頻率達到300khz時，起始磁導率下降不到20 % ，其性能相當于epcos公司改進的t38材料。Measurement of quartz crystal unit parameters - measurement of activity and frequency dips of quartz crystal units
石英晶體元件參數的測量.石英晶體元件的活性和頻率下降的測量Measurement of quartz crystal unit parameters - part 7 : measurement of activity and frequency dips of quartz crystal units
石英晶體元件參數的測量.第7部分:石英晶體元件的放射性和頻率下降測量They said their efficiency at work was reduced by about 40 percent and reported a high frequency of accidents, lateness and
他們說，他們的工作效率下降了40 ，而且意外事故遲到和礦工的發生頻率也很高。They said their efficiency at work was reduced by about 40 percent and reported a high frequency of accidents, lateness and absenteeism
他們說，他們的工作效率下降了40 ，而且意外事故遲到和礦工的發生頻率也很高。分享友人