America's system of national parks, a model for similar set-ups around the world, was based on the idea of limiting human presence to passing visits, rather than permanent habitation.
美国的国家公园就是分布于世界各地类似的系统中的典范，其理念就是在保护区内人类只是游客，而不能成为永久居民。
Statler's first permanent hotel, in Buffalo, opened the year the Model t Ford was launched, and, like it, used standardisation and large-scale production.
Statler的第一家永久性酒店坐落在布法罗，其开业的那年正好是福特T型轿车下线的那年。这家酒店也采用了和生产T型轿车一样的标准化和大规模的生产方式。
When the sun's rays passed through a lens in one of the walls, Leonardo's 3D model would have been projected on to the material, creating a permanent image.
当阳光穿过墙上的一个透镜头时，达·芬奇的三维头像就会被投射在织物上面，制成一个永久性的头像面容。
Under the subway vibration mechanical model of the permanent deformation of loess research.
地铁振动下黄土永久变形力学模型的研究。
The data acquisition and transform model which suits for permanent real-time monitoring reservoir dynamically under network has also been founded.
建立了适合网络化永久性油气藏动态监测的数据实时采集、处理、传输模型。
In the same structural model, hydrocarbon migration rate within interim opening fractures is faster than that of permanent ones.
在相同地层结构模型中，间歇性开启断裂中的油气运移速度较永久性开启断裂快；
An equation for pavement rutting depth under multi-load is derived by using Ohio state permanent deformation model.
利用俄亥俄州永久变形模型，推导出用于求多级荷载下路面车辙深度的计算公式。
Using this model the permanent distortion and work life in long term under thermal cycling can be predicted based on a few test data.
利用该模型，根据少量试验数据可预示长期冷热循环下的永久变形或工作寿命。
On the basis of relationship between permanent distortion and thermal cycling number, we present mathematical model in terms of power function.
根据实测的永久变形与温度循环次数的关系，提出了一个幂函数的数学模型。
Taking PM type(the permanent magnet model) SLPMU -025A motor as an example , this paper makes analytical calculation of its efficiency characteristics by the means of equivalent circuit.
以日本神钢电机公司制造的PM型（永久磁铁型）SLPMU-025A为样机，利用等效电路法对其效率特性进行了解析计算。
In this paper, a calculation method of permanent magnet in magnetic path has been introduced, and a high efficient model of magnetic path has been established.
文中介绍了永久磁体在磁路中的计算方法，建立了高效率的磁路模型。
The permanence of a two - species model are investigated by different state-feedback controls. Some sufficient conditions which make the model in question permanent are obtained.
通过不同的状态反馈控制研究了一个二维种群模型的永久持续生存问题，得到一些使被研究系统永久持续生存的充分条件。
In the second section, considering the permanent immunity factor, the SEIR epidemic model with infectious force in the latent period which makes the model more universal is investigated.
第二部分考虑了永久免疫力因素，研究了一类潜伏期具有传染力的SEIR模型，使模型更具有广泛性。
The two-dimension plane model and the simplification of dynamic loading are applied to create the finite element model for asphalt pavement permanent deformation analysis.
采用二维平面模型，“以静代动”的荷载简化方法，建立沥青路面永久变形有限元分析模型。
According to the mathematical model and torque characteristics of permanent magnet brushless DC motor, the reasons that give rise to torque ripple have been analyzed in this paper.
依据永磁无刷直流电动机的数学模型及其转矩特性，分析了转矩脉动产生的多种原因，并介绍了各种有效的控制策。
Based on the structure characteristics and operation principle of permanent magnet linear synchronous motors (PMLSM) with discontinuous stators, a simulation model was developed.
从不连续定子永磁直线同步电动机的结构特点和工作原理出发，建立起电机的仿真模型。
A robust control scheme on the model of surface permanent magnet synchronous motor, composing of a sliding-mode controller and a sliding-mode observer, was presented in this paper.
基于表面式永磁同步电机在二相坐标下的数学模型，采用滑模变结构方法设计了由滑模控制器和扩展滑模观测器组成的鲁棒控制系统。
The working principle of permanent magnet biased magnetic bearing (PMB) is introduced, and the mathematical model of single-degree of freedom is deduced.
介绍了新型永磁偏置磁轴承的工作原理，推导了该磁轴承的单自由度数学模型。
The structure of two axial radial permanent magnet electromagnet bearing is introduced. The model of control system is founded.
介绍了两轴型永磁偏置磁悬浮轴承的系统结构，建立了磁轴承的控制系统模型。
Firstly, the dynamic equation of SA antenna rotation driven by two-phase permanent magnetic stepper motor was derived. Then the structured model uncertainties were described.
首先推导出了由两相永磁步进电动机驱动单址天线转动的动态方程，描述了系统存在的模型不确定性。
A novel multi phase permanent magnet motor's mathematical model that combines multi loop theory of AC motor and finite element method of electromagnetic field is proposed in the paper.
将交流电机的多回路理论与电磁场的有限元方法结合起来建立了多相永磁同步电动机的多回路—有限元数学模型。
Because the dynamic character of PMA is affected by permanent magnet and exciting current, in this paper, new mathematic model and equation are established and the calculation result is analyzed.
在动态计算中本文根据永磁和激磁电流共同作用这一特点，建立了相应的数学模型，给出了动态微分方程组的求解方法，并对动态过程进行了分析。
A novel initial rotor position estimate method is proposed on the surface mounted permanent magnet synchronous motor (PMSM), which is based on the PMSM de-coupled model analysis.
针对表面安装式永磁同步电机，给出了电机解耦模型，分析了电枢绕组的电感饱和效应，提出了一种判断初始转子位置的综合性方法。
The proposed model takes into account the shear modulus, the damping ratio, pore water pressure and permanent deformations of pavement foundation materials.
该模型可以全面考虑路基材料的剪切模量、阻尼比、孔隙水压力以及永久变形。
As for the permanent magnet in the system, the (equivalent) current model is adopted.
对系统中的永磁体，采用了等效电流模型。
The dynamic model for a novel permanent magnet spherical stepper motor based on Cardan Angle rotation in rotor-fixed coordinates frame was set up.
针对一种新型永磁球形步进电机，运用卡尔丹角旋转建立了转子固连坐标系下转子动力学模型。
Based on the analysis of the working principle a type of high-speed permanent magnetic bearing, bearing capacity model was founded on Coulomb's Law.
在分析一类高速永磁轴承工作原理的基础上，根据磁库仑定律建立其轴颈轴承承载力模型。
According to the position of the secondary, the integrated dynamic model of a permanent linear synchronous motor (PMLSM) with several segment primaries is established.
从次级位置变量出发，建立多段初级式永磁直线同步电机整体动态模型。
According to the position of the secondary, the integrated dynamic model of a permanent linear synchronous motor (PMLSM) with several segment primaries is established.
从次级位置变量出发，建立多段初级式永磁直线同步电机整体动态模型。
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