非稳定的

In the paper, the logarithmic transformation for the analytic solution on the space-time change of the tracer concentration during the instantaneous injection and the process of the one dimensional steady flow field and two-dimensional unsteady hydrodynamic dispersion is performed, and the linear equations have been obtained.

该文将描述瞬时投放示踪剂、一维稳定流场二维非稳定水动力弥散过程中的示踪剂浓度在时空上变化的解析解进行了对数变换，得到一直线方程。

Anisotropism of the penetrability of dam and foundation material arouses that the density of the equipotential line of water head at entrance enlarges, residual water head are higher than the height of the soakage-line in large seepage field, and the exit points of seepage flow rises.

本文在总结前人研究成果的基础上，主要研究和探讨了以下四个方面的内容：饱和非—饱和、稳定—非稳定渗流计算的有限元分析；堤防渗控措施的比较和优化；土体湿化以及湿化变形的计算；土体渗流场和应力场的耦合计算问题。

Hamilton principle can be used in holonomic system and intrinsical linear nonholnomic system. The formulas of them are unified. Hamiltonian action is stability in intrinsical linear nonholnomic system.

本文将Hamilton原理应用到本质线性非完整系统，首次证明了在本质线性非完整系统中，Hamilton作用量为稳定的作用量；将完整系统和本质线性非完整系统的Hamilton原理从形式和本质上统一起来。

The fourth chapter analysesthe differences of the resistance between the boundariescalculated by different models.It can seen from the results thatthe differences between resistances calculated by variousfunctions can ignored under unstable conditions.There areobvious differences between different resistances calculated bydifferent functions under stable conditions.However,in bothcases,error from any function to predict transpiration rate isignoble.In order to make more applicable,the Monteith modelwas fished in this chapter.

第四章分析了各种边界层阻力计算模型计算结果的差异，比较结果表明，在空气层结不稳定时，各种φm函数经验模型计算阻力的差异可忽略，而当空气层结稳定时各种φm函数经验模型所算边界层阻力有明显差异，但不论是稳定和非稳定层结下，任选一中φm函数计算模型对蒸腾速率计算结果所造成的差异可忽略，为便于应用，本章还比较和检验了Monteith模型计算结果的差异，结果表明，该模型用于蒸腾计算，其误差可忽略不计。

A non-stiff transformation method is presented in this paper, based on the above theory, general Schur product multistep method is put forward.

本文讨论了刚性常微方程的非刚性转化方法，在此基础上，获得一类广义Schur积多步法（通过这种非刚性转化方式，显式Euler方法将成为一个A-稳定的方法）。

The crystal-lization of this amorphous alloy is a multi-stage continuous nucleation up to saturation process. The local crystallization energy decreases gradually indicating that the thermal stability of the residual amorphous matrix becomes weak at the steady crystallization stage, which is ascribed to the diffusion of boron atoms at elevated temperatures.

进一步研究发现，该非晶合金的晶化为多阶段的连续形核直至饱和的过程；当进入稳定晶化阶段时，剩余非晶的局域晶化激活能逐渐下降，非晶基体的热稳定性降低，这是由B原子的高温扩散导致的。

Prior to this, the market stabilization fund has multiple versions, it said in the name of covert push for stabilization fund to enter the market directly, but also said the introduction of a special stabilization fund to take "the size of non-" the.

在此之前，市场稳定基金有多个版本，它说，在为稳定基金秘密推动名称直接进入市场，但也说一个特别稳定基金，以推行"非大小"的。

The formulations contain a nonionic polymer, a nonionic surfactant and an ionic tonicity agent, but are physically stable and easily re-suspended.

该制剂包含非离子聚合物、非离子表面活性剂和离子性补强剂，但是物理稳定的且易于再分散。

The unstable region of a straight rod with noncircular cross-section extends with the increasing of the asymmetry of the cross-section.

非圆截面直杆的不稳定区随非对称性的增加而扩大。

The main results are as follows:(1) In unsteady phase, ground fissures caused by collapsing facilitate the loss of soil water. The soil water content of fissure district is about 50% less than that of non-fissure district of subsidence area, which close to or below wilting coefficient. This will be a great threat for the survival and growth of vegetation.

取得的主要进展和认识如下：(1)塌陷非稳定阶段，塌陷裂隙对土壤水分散失具有重要影响，与塌陷区非裂缝带土壤水相比，塌陷裂缝部位土壤水分损失几乎达50%，接近或低于凋萎系数，对植被生存、生长构成威胁。

Cynanchum Lingtai apricot production in the average weight 65 grams, the brightly-colored fruit, juicy rich, sweet-sour taste, sweet from the nucleolus, when the late Qing Dynasty famous Shaanxi, Gansu provinces, the Qing imperial court Tongzhi tribute for years.

灵台生产的牛心杏平均单果重65克，果实色泽鲜艳，汁多味浓，甜酸适口，离核仁甜，清末时就驰名陕、甘两省，清同治年间曾为朝廷贡品。

Chenopodium album,Solanum nigrum, and Amaranthus retroflexus were very susceptible to the herbicides. Polygonum persicaria and Abutilon theophrasti were relatively less susceptible to the herbicides, and Lycopersicon esculentum was not susceptible to it. The relationship between reduction rates of weed biomass and PPM values of weed leaves 2,4, and 6 days after treatment was established.

供试的6种杂草对该混剂的敏感性存在显著差异：红心藜Chenopodium album、龙葵Solanum nigrum和反枝苋Amaranthus retroflexus对该混剂最敏感，ED90值分别为47.65、71.67和29.17g/hm2；春蓼Polygonum persicaria和苘麻Abutilon theophrasti敏感，ED90值分别为96.91、114.20g/hm2；而番茄不敏感。