如果所有的基础方程都是线性的，那么该系统也是如此。
如果所有的基础方程都定义于整个时间过程，那么，该系统就是连续时间系统。
If all elemental equations are defined for all time, then the system is a continuous-time system.
如果一个或多个基础方程是非线性的，例如在应用二极管的场合，那么整个系统也就成了非线性的。
If one or more elemental equations are nonlinear, as is the case for a diode, then the overall system is nonlinear.
如果有一个或多个参数，甚至连基础方程本身都以一种已知方式随时间而变化，则此系统就称为时变系统。
If one or more parameters, or the very form of an elemental equation, vary in a known fashion with time, the system is said to be time-varying.
当所有基础方程都能用一组定常参数值来描述，正如熟知的RLC电路的情况，就称该系统是稳态的，或时不变的，或常系数的。
When all elemental equations can be described by a set of constant parameter values, as in the familiar RLC circuit, the system is said to be stationary or time-invariant or constant coefficient.
而假如，在采样问题或数字系统中常见这种情况，有些基础方程仅定义于，或仅能应用于离散的时间点上，这就导致了离散时间系统。
If, as in sampling or digital systems, some elemental equations are defined or used only at discrete points in time, a discrete-time system is the result.
可汉学院（Khan Academy） -超过1200个视频教程，内容涵盖自基础算术、代数至微分方程、物理学、化学、生物学和金融学。
Over 1200 videos lessons covering everything from basic arithmetic and algebra to differential equations, physics, chemistry, biology and finance.
在压力信号的基础上，一个流体方程测算了涡流的位置和力度。
Based on the pressure signals, a flow model estimated the position and strength of the eddies.
分析了机器人的结构，在此基础上建立了运动学方程。
Analysis of the structure of the robot, in this based on the kinematics equations.
这些方程是进行生物电流检测和组织功能成像的理论基础。
These equations are the base of the bioelectric currents detecting and the function imaging of tissue.
弹性力学基本方程正确的弱形式将是有限元分析的基础。
The correct weak form of basic equations in elasticity is the foundation of finite element analysis.
并以此为基础，通过一个典型的船舶机械液压传动系统，推导出全信息方程来确定最佳的监测点和故障位置。
On these bases, this paper deduces the full information equation to determine the best monitoring points and fault position by a typical shipping mechanical HTS.
本文以姿态误差四元数与陀螺漂移误差之间的关系为基础，构建了系统状态方程；
The state equations of the system are established on the basis of the relation between attitude error quaternion and the gyro drift.
“恋爱真的存在化学基础”科什·鲍姆说“我觉得，想要理解这个并不是要在化学方程序中寻找浪漫”。
"There really is a chemical basis for falling in love," Kirshenbaum said. "I don't think trying to understand it takes any of the romance out of the equation."
这是研究正倒向随机微分方程的基础。
This work is a foundation of the study of forward-backward equations.
第三、第四章在理想气体的基础上，得出了实际气体状态方程及其多变过程中热力学计算。
In chapter three and four, we give some state equations of real gas and the thermodynamical analysis in polytropic process based on the theory of ideal gas.
其次在对机构运动学分析的基础上，利用机构的雅可比矩阵和运动学反解方程对机构的工作空间进行分析。
Secondly on the basis of the mechanism kinematics' analyzing, the mechanism's workspace was analyzed through the Jacobian matrix and the inverse kinematics equation.
做为基本计算单元之线性方程组，以矩阵形式表示线性方程组，基础矩阵运算。
Linear equation sets as basic computational unit, expressing linear equation sets in matrix form, basic matrix operations.
分析化学的基本规律通常被作为一笔化学制品和物理基础提出，分析的方法和程序的法律，公理和方程序。
Fundamentals of analytical Chemistry are usually presented as a sum of chemical and physical foundations, laws, axioms and equations for analytical methods and procedures.
给出一个适用于平面断裂力学分析的新边界积分方程，在此方程的基础上建立了边界元数值计算方法。
A new boundary integral equation is introduced to analyze plane elastic problems with cracks, and the boundary element numerical method based on this equation is established.
以纤维缠绕结构的网格理论为基础，建立了纤维缠绕圆锥壳体在内压作用下的平衡方程。
Based on the netting theory for the filament-wound structure, the balanced equation of the filament-wound conical case under internal pressure was derived.
在此基础之上，探讨动态的地下水储量方程，并归纳出影响地下水储量的因素。
And then, it discusses the dynamic ground water storage equation and finds the factors that affect the aquifer storage.
这些工作为格林函数快速计算方法的实现以及积分方程的矩量法高效求解打下了基础。
The derivations lay a good foundation for the efficient evaluation of Green's functions and the fast solving of scattering problems by the method of moments (MoM).
该法以电路的改进节点方程为基础，具有建立故障诊断方程容易，所建立的方程具有较低的非线性度及规则的雅可比矩阵的特点。
This method based on modified nodal approach is easy to set up the fault diagnosis equations and has lower degree of nonlinearity and regular Jacobi matrix form.
在此基础之上，探讨了动态的地下水储量方程，并归纳出影响地下水储量的因素。
And then it discusses the dynamic ground storage equation and finds the factors that affect the aquifer storage.
该方法以测量的应变值为基础，由拟合的曲线方程计算接头载荷，并与试验时施加的总载荷对比。
In this method, based on the measured strain values, the joint load is calculated by the fitted curve equation and compared with the total load applied during test.
可能相信，在表1的基础上，这对幸福方程的解释能力低。
It might be believed, on the basis of Table 1, that the explanatory power of happiness equations is low.
毛细压力、相对渗透率与饱和度的关系是求解多孔介质多相流运动方程的基础。
For solving porous media multiphase flow equations, capillary pressure-relative permeability-fluid saturation relationships are the most important bases.
本文在梁方程的基础上研究了一类具有非线性阻尼项和力源项的四阶波动方程的初边值问题。
In this paper, the initial-boundary value problem of a kind of nonlinear fourth-order wave equations with damping and source terms is studied on the base of Beam equation.
在假定桩土接触面不产生滑移的条件下，确定在桩基础沉降过程中与能量守恒定律等效的位移协调方程，并在此基础上建立了一种新的单桩沉降计算方法。
Assuming no slippage occurred on the interface between pile and soil, an equivalent equation of displacement coordination is obtained to constitute a new method calculating settlement of single pile.
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