Some say that once the costs of power generation are factored into the equations, electric cars are only half as efficient with regard to energy use as modern diesel vehicles.
有人认为，一旦将发电成本综合考虑在内，在能源使用方面，电动汽车的效率只能达到目前现代柴油车的一半。
So let's start with a case when we have some number of the equations say n equations and n unknown.
所以让我们从一个例子入手，当我们有一些方程式，假定n个方程，n个未知数。
This paper states the expressions of solution of some differential equations with delay.
给出了一类具有滞量的微分方程解的部分表达式。
In the second part, we mainly consider oscillations of solution of some linear and nonlinear partial difference equations with discrete variables and delays.
第二章主要是研究某些类型的线性或非线性的带有离散时滞的偏差分方程解的振动性的判别法。
We report some new results about nonlinear differential equations on a finite discrete segment with periodic boundary conditions.
还得到了有限离散区间上非线性微分方程在周期边值条件下的一些新结果。
This dissertation is to discuss the laws of fluids in porous medium for original boundary value problem of some quasi-linear parabolic equations with the third type nonlinear boundary condition.
本文讨论描述流体在稀疏介质中流动规律的一类拟线性抛物型方程具有第三类非线性边界条件的初边值问题。
Some equations for the properties of concrete with different percentages of recycled aggregate of the two cases are proposed based on the test results.
最后根据本文的试验结果，建议了两种情况下不同再生骨料掺入量混凝土的基本力学性能计算公式。
The distribution of zeros for nonlinear differential equations with positive arguments by method of polynomial series, and some more explicit conditions to oscillate are given.
通过构造多项式序列的方法，建立了非线性时滞方程的解的零点分布，给出了较为广泛的振动条件。
Moreover, we investigate the existence of analytic solutions for polynomial-like iterative equations with variable coefficients and improve some known results.
同时也研究了变系数多项式型迭代函数方程解析解的存在性，其结果改进和推广了作者本人以前的工作。
This paper is concerned with oscillation of solutions of a class of nonlinear partial difference equations. Some sufficient conditions of oscillation for the equations have been obtained.
本文讨论了一类半线性偏差分方程解的振动性，得到了这类方程解的振动性的一些充分条件。
The hyper order, the exponent of convergence and the hyper-exponent of convergence of zeros of solutions for some types of K-order linear differential equations with entire coefficients are discussed.
研究了几类K阶整系数线性微分方程解的超级、零点收敛指数和零点超收敛指数，得到一些精确的结果。
This paper is concerned with of asymptotic behavior for a family of neutral delay nonlinear difference equations, which improves some known results.
本文研究一类非线性中立型时滞差分方程的非振动解的渐进性，改进了相关的结果。
In this paper, we have studied the oscillation of the first order neutral functional differential equations with delay and advanced argument, obtained, some sufficient conditions extended and impoved.
本文研究了既有滞后量又有超前量的一阶中立型常系数微分方程的振动性，得到了其振动的几个充分条件。
By the first integral method, the existence, uniqueness and nonexistence of solutions for some nonlinear ordinary differential equations with singular boundary condition are discussed.
用首次积分法，讨论了带奇异边界条件的非线性常微分方程解的存在性、不存在性和唯一性。
In this paper, some properties of solutions to a class of high order neutral differential equations with continuously distributed delay are studied.
研究了一类具有连续分布滞量的高阶中立型方程解的性质。
We successfully derived some exact solitary wave solutions of the nonlinear approximate equations with long waves in shallow water by using the hyperbola function method.
用双曲函数法，成功得到了非线性浅水长波近似方程组的精确孤立波解。
In chapter two, some fundamental equations of thermodynamic functions are obtained which become criterions of equilibrium along with the state equations.
第二章由基本定律得出了各热力学函数之间的普遍关系式，它们与物态方程相结合，成为确定物质平衡态性质的依据。
Some current traces were fitted with corresponding equations.
部分电流用相应的方程拟合。
The solutions of interal form and the general solutions of some second order homogeneous linear differential equations with variable coefficient are given.
给出了变系数二阶齐次线性常微分方程的一种积分形式解和几类变系数二阶齐线性常微分方程的普遍解。
In this paper, several kinds of reaction-diffusion ecological systems with three or more than three equations are studyed and some valuable results are obtained.
本文着重研究了几类三维或三维以上的反应扩散生态系统，得到了一些有益的结果。
A dynamic model of overhead cable for ropeway is developed, i. e. some differential equations of its vibration with initial and boundary conditions proved.
建立了架空索道在起动和制动时缆索的纵向运动微分方程，对其进行了数值求解。
Some kinds of iterative functional equations together with some basic results are introduced in Chapter 1.
在本文的绪言中介绍了几类迭代函数方程，并对与之相关的一些基本结果作了一个简要介绍。
Some sufficient conditions are obtained for the oscillation of first order neutral differential-difference equations with positive and negative periodic coefficients.
本文获得了一阶正负周期系数的中立型微分差分方程振动的充分条件。
While rereading, do some kind of pencil-work in which you jot down selected facts, together with formulas or equations.
复习时，你要做好摘记，即记下你要摘选的要点，连同公式或方程序。
Some of the equations can be used to investigate the dynamics of relative motion of non-holonomic system with variable mass.
其中某些方程可用于研究变质量非完整系的相对运动动力学。
On urban land prices and the two-way relationship between empirical research is not at home, This paper on urban land prices and the simultaneous equations model to some extent with exploratory.
关于城市地价与房价关系的双向实证研究在国内还不多，本文关于城市地价与房价关系的联立方程模型研究在一定程度上具有探索性。
Using the fundamental operator family theory, they give some equivalent conditions for robust stability with respect to small delays for the kind of delay equations.
作者首先引入基本算子族的概念，然后应用它得到了几个小时滞鲁棒稳定性的等价条件。
In this paper, some sufficient conditions are obtained for the oscillation solutions of systems with high order partial differential equations of neutral type.
本文获得了一类中立型偏微分方程系统解振动的若干充分条件。
In this paper, some sufficient conditions are obtained for the oscillation solutions of systems with high order partial differential equations of neutral type.
本文获得了一类中立型偏微分方程系统解振动的若干充分条件。
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