理论模型

P. P. Raevski〓, and pointed that this polarization at grain boundary between WO〓 monoclinic and triclinic phases causes a modification to Schottky barrier is origin of nonlinear electrical characteristic of tungsten oxide polycrystalline ceramics.

Raevski〓的铁电半导体非线性电输运理论模型的框架内，我们重点考虑了铁电极化对WO〓陶瓷非线性电输运特性的影响，指出由于三斜和单斜晶相的共存，在其晶界处存在的电极化可以对Schottky势垒产生一种修正，是导致出现压敏现象的一个重要因素。

The method is called apparent density inversion. The inversion technique overcomes drawbacks of long computation and unstable solution, it takes less than 20 seconds to compute a density data set of 128 ×128×10 points on a PC of 1.99 GHz. The method is demonstrated on synthetic models and on real gravity data

本反演方法克服了传统已有方法计算时间特别长、解稳定性差的缺点，在主频1.99 GHz的微机上，反演128×128×10个密度值的计算时间小于20 s，理论模型和实际资料的应用表明反演具有较好的效果。

Narrow Line Seyfert 1s (NLS1s, including high luminosity quasars with similar properties) are very important extrema of type Ⅰ AGNs. The unusualness of NLS1s is very useful to test the viabilities of AGNs models and thus provide a new way probing into AGN phenomena. The ratio of Fe to α-element (e. g., O, Ne, Mg...), Fe/α, can serve as an excellent indicator for constraining the ages of star-forming systems.

中文题名窄线SeyfertⅠ星系与活动星系核光学FeⅡ发射线副题名外文题名论文作者周宏岩导师周又元王挺贵学科专业天体物理研究领域\研究方向学位级别博士学位授予单位中国科学技术大学学位授予日期2003 论文页码总数127页关键词活动星系核河外星系馆藏号BSLW /2003 /P15 /7 窄线SeyfertⅠ型星系(Narrow Line Seyfert 1，NLS1，包括具有类似性质的类星体)是具有极端性质非常重要的一类Ⅰ型AGN，对NLS1的深入研究是限制和完善活动星系核理论模型的一条新途径。

The research is about the reuse of urban sewage for virescence irrigation, and the influence of sewage irrigation on eco-environment such as soil, plant, etc. is studied. Under the condition of field sewage irrigation, the transport and transformation and accumulation mechanism of heavy metals, nutrients and organic pollutants as vaporizable hydroxybenzene etc. in the soil-plant system are analyzed. The heavy metal pollution is evaluated by the comprehensive pollution index. The spatial variability of heavy metals in sewage irrigation area is further understood. The spatial variability of heavy metals and physical and chemical properties of soil are reflected in a more straight way by the theory model of variance function curve based on the geographical information system.

在城市污水回用于绿化灌溉对土壤、植物等生态环境的影响研究中分析了大田条件下污灌对土壤-植物体系中重金属、养分及挥发酚等有机污染物迁移转化及富集机理，对重金属污染进行了综合污染指数评价，进一步了解了污灌区重金属分布的空间异质性，基于地理信息系统提出了变异函数曲线的理论模型，更直观地反映出了重金属元素与土壤理化参数的空间变异特征。

Testing on standard Marmousi theoretical model and actual data shows that the extended pre-stack time migration for laterally variable velocity can improve the. imaging accuracy of complex structure.

标准的Marmousi理论模型数据和实际资料的测试结果表明，扩展的横向变速叠前时间偏移能够提高复杂构造的成像精度。

According to the characteristics of high compressive strength and viscosity of granites, the dynamic compressive strength variable of comminuted zone is introduced and the theoretical pressure model of the spherical cavity expansion is ameliorated.

根据花岗岩具有高强度和粘滞性的特点，引入粉碎区动态抗压强度变量，改进了球形空腔膨胀压力的理论模型。

In addition, according to Masahiko's model, the ion-complex with cuplike structure can easily form vesicle.

另外，根据Masahiko的理论模型，离子对具有杯状结构容易形成囊泡。

For H_2~+ molecule, the basic theory model is the same as that for a single proton, but adding in the interactions of fragment ions, concluding Coulomb forces and wake-like interaction. Then the trajectories of each of the fragment ions can be simulated in order to further study the vicinage effect.

对于氢分子离子在碳纳米管中的库仑爆炸过程，基本理论模型与求解单个离子时所采用的相同，但是考虑了离子之间的相互作用力，包括库仑相互作用与尾流效应，计算出分子离子中每个离子的运动轨迹，从而对邻近效应进行分析。

Design and optimization methods of low dropout voltage regulator are studied through the analysis of their topology and operational process.

研究了电容式电荷泵电路的基本类型和动作原理，建立了一个理论模型，给出了电荷泵电路的性能评估方法。

From the heat equilibrium equation of the working principle in common water-heater, the model of control system in mathmatics is founded, the diagram of structure is designed, and the working process and principle including the digital input and automatic temperature control are described detailedly.

从传统热水器工作时的热平衡方程入手，依次建立起数学上的控制理论模型。

However, as the name（read－only memory）implies, CD disks cannot be written onorchanged in any way.

然而，正如其名字所指出的那样，CD盘不能写，也不能用任何方式改变其内容。

Galvanizes steel pallet is mainly export which suits standard packing of European Union, the North America. galvanizes steel pallet is suitable to heavy rack. Pallet surface can design plate type, corrugated and the gap form, satisfies the different requirements.

镀锌钢托盘多用于出口，替代木托盘，免薰蒸，符合欧盟、北美各国对出口货物包装材料的法令要求；喷涂钢托盘适用于重载上货架之用，托盘表面根据需要制作成平板状、波纹状及间隔形式，满足不同的使用要求。