二次方程

Twelve density treatments were designed, which were 225×10^4 (T1), 300×10^4 (T2), 375×10^4 (T3), 450×10^4 (T4), 525×10^4 (T5), 600×10^4 (T6), 675×10^4 (T7), 750×10^4 (T8), 825×10^4 (T9), 900×10^4 (T10), 975×10^4 (T11) and 1050×10^4 (T12) basic plants/hm^2. Grain dry matter growing process and grain filling rate could be described by Richards Model and Monodic Quadratic Equation, and the grain filling parameters could be calculated from Richards model fomula. Relation analysis, stepwise regression analysis and path analysis were made by DPS, SPSS software.

方法设计了225万(T1)、300万(T2)、375万(T3)、450万(T4)、525万(T5)、600万(T6)、675万(T7)、750万(T8)、825万(T9)、900万(T10)、975万(T11)、1050万(T12)基本苗／hm^2共12个密度处理，分别运用Richards模型、一元二次方程模拟了冬小麦籽粒干物质增长过程及籽粒灌浆速率随花后时间的变化情况，并对所建立的Richards模型进行推导得到基本的灌浆参数，通过SPSS、DPS软件对籽粒灌浆参数与千粒重进行相关、逐步回归及以及通径分析。

The HFE cryptosystem presented by Jacques Patarin in 1996 has long been regarded as the most promising one of multivariate cryptosystems,and is a promising public key cryptosystem with many practical applications:very fast or very short digital signatures,fast public key encryption,etc.

多变量密码系统设计与分析是近年来密码学研究领域中的一个非常活跃的研究方向，其中基于有限域上多变量二次方程组的求解问题设计密码系统并对其进行分析是这一方向的一个重要内容。

The changes of partitioning ratio index for unit organ could be described by exponential equation and quadratic equation with different stem internode,leaf,petiole,and cotton bud and boll according to different internode positions on main stem and sympodial stem.

模型采用线性和指数方程描述了叶片、叶柄、主茎、分枝及蕾铃单位器官分配比例指数随GDD的动态变化过程；分别用指数方程及一元二次方程描述了叶片、叶柄、主茎、分枝及蕾铃单位分配比例指数随不同叶位、节位的动态变化过程。

The same for Aristotle, with most of his biological taxonomical theories lived even over 2000 years, some of them were not challenged until 150 years ago.

古埃及人已经能解决一些属于一次方程和最简单的二次方程的问题，还有一些关于等差数列、等比数列的初步知识。

The effects of drug phosphatidycholine ratio, pluronic F 68 concentration and glycerol tristearate concentration on the mean particle size, entrapment ratio and drug loading were investigated.

结果 平均粒径、包封率、载药量和综合指标拟合所得多元二次方程的复相关系数分别为 0 93 93 ，0 773 9，0 980 1和 0 83 69。优化条件制备的药质体的平均粒径、包封率和载药量分别为 76nm ，97 4 9%和

In Chapter Seven, This chapter established on the comparison of the Fibonacci's Liber Abaci, al-Khwārizmī'algebra and al-Karajī's al-Fakhrī.

本章建立在对斐波那契《计算之书》、花拉子米《代数》、以及凯拉吉的《奇妙之事》中代数学比较研究基础之上，分析他们在代数技巧、代数方法有效性的证明方法、未知数设定、二次方程分类、算题选择和设置形式等方面的异同。

Based on extended Dixon resultants , a new algorithm DR is proposed to solve the system of multivariate polynomial equations.

针对密码学中的多变元多项式二次方程系统求解问题，基于扩展Dixon 结式提出了一种求解算法DR。

Ellipsoid is given followed by the same definition of the standard ellipsoid equation, and the long axis of the ellipsoid volume formula of a ternary quadratic equation that the circumstances under which ellipsoid provides the basis to determine the final conditions in the ellipsoid three-ball, how long, the size of it?

接着同样给出椭球面的定义，椭球面的标准方程，及椭球的三轴长，体积公式，对一个三元二次方程什么情况下表示椭球面提供了判断依据，最后在此条件下椭球的三轴长又如何计算，体积呢？

Theoretically speaking, it is a rather-clearly discussed subject to standardize the quadratic equation into the normal forms by spinning the coordinate axis so as to approach the shapes of its curves.

从理论上讲，通过坐标轴旋转将二次方程化简为规范形式，从而讨论其曲线的形状，这已是讨论得相当明瞭的课题。

According to the clear water experiment, aeration performance of the new equipment is good with high total oxygen transfer coefficient and oxygen utilization ratio.

曝气设备的动力效率在叶轮转速为120rpm～150rpm时取得最大值，此时氧利用率和充氧能力也具有较高值。

The environmental stability of that world - including its crushing pressures and icy darkness - means that some of its most famous inhabitants have survived for eons as evolutionary throwbacks, their bodies undergoing little change.

稳定的海底环境─包括能把人压扁的压力和冰冷的黑暗─意谓海底某些最知名的栖居生物已以演化返祖的样态活了万世，形体几无变化。