| 1. | The most representative macroscopic model for semiconductors is hydrodynamic model
最具代表性的宏观模型是关于半导体的流体动力学模型。 |
| 2. | In the past , the hot point is the macroscopic model , which discusses the relationships among the traffic stream variables - speed , flow and density
以前的研究主要集中于宏观模型，讨论交通流量及密度的变化。 |
| 3. | These models are classified to submicroscopic model , microscopic model , mesoscopic model and macroscopic model according to the level of detail
如按细节层次分，交通仿真模型可分为亚微观模型、微观模型、中观模型和宏观模型。 |
| 4. | Then second class are the macroscopic models describing directly macroscopic quantities such as charge density , charge current density , energy density and temperature etc .
另一类是宏观模型，其直接描述电荷密度，电流密度，能量密度和温度等一些宏观量。 |
| 5. | Then , against the existing problems in many macroscopic models and deterministic simulations , this thesis selects the idea of microscopic simulation to simulate discrete and stochastic traffic procedure
然后针对以往较多的宏观模型和确定性仿真存在的问题，选用微观仿真的思想来模拟离散随机的交通过程。 |
| 6. | So , this paper firstly uses a macroscopic model , sets the coupling interaction model with the natural ventilation system and the system of building thermal process ; and then makes a dynamic simulation program with the matlab language
本文首先采用宏观计算模型，建立了自然通风系统和建筑热过程系统的耦合影响作用模型，并采用matlab语言编写了动态数值模拟分析计算程序。 |
| 7. | Because the microscopic model needs the distinct structure relation , the numerous input data and the long time of computing , the macroscopic model was used . after analyzing methods for the nodal pressure , the corresponding optimal program was drawn up
由于微观模型要求拓朴结构关系清楚，所需输入数据多，计算耗时长，所以根据实际情况建立了管网的宏观模型，针对宏观模型的特点，分析了测压点数目和位置的确定方法，进而编制了计算机优化程序。 |
| 8. | Specifically , we present a full velocity difference ( fvd ) car - following model , a cellular automata ( ca ) model that considers the velocity effect of the preceding car , another ca model that can describe the synchronized flow , and a speed gradient ( sg ) macroscopic model which can describe the anisotropic properties of traffic flow
具体地说，我们提出了一种全速度差车辆跟驰模型，一种考虑前车速度效应的元胞自动机模型，另一种能较好模拟同步流的元胞自动机模型，以及一种能体现交通流各向异性特征的速度梯度宏观连续模型。 |
| 9. | The direct optimal model of multi - objective mixed discrete variables for lager - scale water supply system was established , by replacing complicated network hydraulic equation with nodal pressures macroscopic model and relationship model between pump stations flow and head in water supply systems without tanks or towers , genetic algorithm was developed to solve the direct optimal model
以测压点压力宏观模型、水源供水量和水源供水水头之间的关系模型替代复杂的管网水力平衡方程，建立了大型供水系统的多目标混合离散变量的直接优化调度模型。在没有水池和水塔的供水系统中，利用遗传算法对直接优化调度模型进行求解。 |
| 10. | Since the concept of superlattice was proposed , vertical transport in superlattice has been investigated widely . the electric field domains and current self - oscillations which result from sequential resonant tunneling between different subbands of the superlattice are very significant phenomena . such kind of oscillation can be uesd to make tunable microwave oscillaors . in this thesis , low temperature transport problem , especially the formation of field domain and the condition of current self - oscillations in doped gaas / alas superlattice with weak coupling are investigated thoroughly and also by combining the macroscopic model with the microscopic one . , the voltage - current characteristic and the current oscillation are simulated . the calculated result is nearly consistent with the experimental data
由超晶格中子能级之间的顺序多阱共振隧穿引起的电场畴及电流自维持振荡现象是其中的一个非常有意义的分支，该现象可用来制作电压调谐微波振荡器。本论文对弱耦合掺杂gaaa alas超晶格中的纵向输运特别是针对低温下的场畴的形成和固定偏压下电流自维持振荡产生的条件进行了深入的探讨，并结合宏观模型和微观模型对超晶格在时变电压作用下的电压-电流特性以及固定偏压作用下的电流特性进行了模拟计算。 |
