条件不稳定性

Spectral determination has proved an automatic, quick and nondestructive method for assessment ofnutrition, and the spectral discriminability of the treatments demonstrated the feasibility to evaluate rice N status in field by canopy spectral determination and the potential for detecting rice N status in a wide area by using multispectral remote sensing.

由于从高光谱窄波段的角度与氮素营养之间建立的关系在不同环境条件、不同作物品种之间具有不稳定性，因此本研究在水稻氮素营养光谱诊断方法的研究上避开了单纯使用高光谱连续波段或者窄波段的方法，从以下方面进行研究：。

Due to the potential lability of vinyl triflates, the availability of mild reaction conditions can be critical for efficient coupling of sensitive substrates.

鉴于乙烯基三氟甲磺酸酯潜在的不稳定性，保证反应条件温和对于敏感底物进行有效的交叉偶联反应而言，是至关重要的。

Fourthly, to improve the application value of NESA, the issues of benefit distribution, organizational restriction and stability optimization under the dynamic environment are discussed.

为了加强实际运用价值，论文重点对非股权战略联盟在动态条件下的利益分配、组织约束以及不稳定性的优化问题进行深入的研究。

The different methods of controlling wake flow in engineering are introduced according to concept of absolutely and convectively unstable wake.

本文利用数值方法研究了静止圆柱和振动圆柱在不同流动条件下绕流流场的非定常性、不稳定性和非线性特征。

Confronted with the complicated domestic and international situation,we should recognize the favorable conditions and positive factors ineconomic and social development, and strengthen our resolve andconfidence in overcoming difficulties.

在错综复杂的国内外形势下，我们既要看到经济社会发展的有利条件和积极因素，坚定战胜困难的决心和信心；又要充分估计形势的不确定性、不稳定性，保持清醒头脑，增强忧患意识，宁可把形势估计得严峻一些，把困难考虑得充分一些，做好应对更大困难的长期准备。

These restrictive con d itions can be taken as practical design criteria for avoiding reactor instabilit y and temperature sensitivity in multitubular packed-bed reactors.

这些条件也可以作为避免列管式固定床反应器不稳定性和温度灵敏性的实用设计判据。

The effed Of three-dimensional perturbed velocities and three-dimensional perturbed current densities on the beam-wave interaction of plasma-filled dielectric Cherenkov maser is analysed by use of the self-consistent linear field theory without considering the effect Of the longitudinal guided magnetic field.The dispersion relation and the Simultaneous condition of the beam-wave interaction are derived. It is clearly shown that the instability of the interaction results from the coupling of the TM mode in t...

在无引导磁场的作用下，利用自洽线性场理论，分析了电子的三维扰动速度和三维扰动电流密度对填充等离子体的介质切伦可夫脉塞注波互作用的影响，导出了注波互作用的色散关系和同步条件，所得关系清楚地表明，其工作用不稳定性是由填充等离子体的介质筒慢波波导中的TM模与电子注模通过电子注耦合所致，并求得了电子注引起的频偏和波的增长率。

The coupled frequency equation is obtained by using double velocity potential functions.

因此，在某些条件下，流体可压缩性对R-T不稳定性的影响是不能忽略的。

Breath, muscle contraction of the buttocks; arch body, as far as possible to hold his head, right leg straight towards the ceiling (peg-leg knee in order to avoid muscle tension).

呼气，收缩臀部肌肉；拱起身体，尽量抬起头来，右腿伸直朝向天花板（膝微屈，以避免肌肉紧张）。

The cost of moving grain food products was unchanged from May, but year over year are up 8%.

粮食产品的运输费用与5月份相比没有变化，但却比去年同期高8％。