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- The influence of density ratio on the characteristic frequency of coherent structure on the centreline of low Re number free round jet flow has been investigated with Dual PDA. 采用激光粒子動(dòng)態(tài)分析儀研究了低雷諾數時(shí)密度比對自由圓射流近噴嘴區軸線(xiàn)相干結構特征頻率的影響。
- Cumulative incidence ratio (CIR), incidence density ratio (IDR)and incidence odds ratio(IOR)can be calculated respectively in cohort study according to various study designs. 根據不同的研究設計,在隊列研究中可分別估計累積發(fā)病率比(CIR)、發(fā)病密度比(IDR)和發(fā)病比值(IOR)。
- Magnesium composites, possessing high strength to density ratios, stiffness to density ratios, excellent mechanical and physical properties, are ideal materials for defense high-tech fields. 鎂合金材料有高的比強度、比剛度,優(yōu)異的阻尼減震、電磁屏蔽等性能,是高新技術(shù)行業(yè)的理想材料之一。
- The strain energy density ratio criterion for predicting cracking direction in composite materials is proposed. The Tsai-Hill criterion and Norris criterion of composite materials are extended to predict the cracking direction in compsites. 本文提出預測復合材料中裂紋方向的比應變能密度準則;并將Tsai-Hill與Norris準則擴展來(lái)預測復合材料中的開(kāi)裂方向.
- An investigation was conducted to explore the influence of density ratio and velocity ratio of mainstream/injectant upon the cooling effect of flat plane film using heat-mass transfer analogy. 摘要采用傳熱傳質(zhì)類(lèi)比的方法研究主射流密度差和速度比對單排孔平板氣膜冷卻效率的影響。
- signal-to-noise power density ratio 信噪功率密度比
- carrier to spectral noise density ratio 載波噪聲譜密度比
- bit energy-to-noise density ratio 比特能量噪聲密度比
- His strength in a crisis is an ace in the hole. 臨危不懼是他的看家本領(lǐng)。
- The long war of attrition exhausted the strength of both countries. 這場(chǎng)長(cháng)期的消耗戰耗盡了兩國的力量。
- Experimental Verification of the Criterion of Strain Energy Density Ratio 比應變能密度準則的實(shí)驗驗證
- He gathered all his strength and swung the axe. 他用盡全力掄起斧頭。
- I have hardly enough strength left to move my feet. 我連移動(dòng)雙腳的力氣都幾乎沒(méi)有了。
- Is our relative strength growing? 我們的相對力量正在增長(cháng)嗎?
- The typhoon is gathering strength. 臺風(fēng)的風(fēng)力正逐漸增強。
- Woman is inferior to man in strength. 女人力量不及男人。
- I also learned the strength of the collective. 我還認識到了集體的力量。
- He gathered up his strength for the hard job. 他振作精神去承擔這項艱難的工作。
- The army put on a show of strength. 軍隊公開(kāi)顯示了力量。
- In this game, you need more science than strength. 在這項比賽中,技巧比力氣更重要。