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The planning thoughts between ancient cities and an - cient villages are systematically Compared .

文章最后对古代村落与古代城市的规划思想作了系统的比较。

The proposed method is very e ? cient , robust to noise and fit for the fast application .

该方法计算速度快，对噪声鲁棒性好，适合快速应用。

Necessary and Su ? cient Conditions for the Oscillation of the Second Order Forced Nonlinear Delay Difference Equations

二阶强迫非线性时滞差分方程振动的充要条件

The method used in this paper is clear in conception . simple in principles , and ore effi - cient .

文中方法概念清晰，原理简单，效率较高。

The simulation results for Lennard-Jones fluids show that the new technique is more effi - cient than the old one .

对Lennard-Jones流体的模拟结果表明，该方法与现行的NPT系综模拟方法相比具有更快的收敛速度。

Meanwhile , the coefficient of heat storage and coeffi - cient of thermal inertia of light compound block decrease .

复合轻集料混凝土砌块在热阻增加的同时，蓄热系数减少，墙体的热惰性指标减少。

Cient conditions of extinction of stochastic sys-tems are obtained . 5 . A stochastic n-species Lotka-Volterra model is investigated .

最后分析了导致随机系统灭绝的充分条件。5.研究了一类n种群随机Lotka-Volterra模型。

Prac - tice indicates that application of and improvement on the casting process is an important technical measure to ensure effi - cient smelting and low cost of pig iron .

实践表明，渣铁沟浇注料工艺的实施和不断完善，是高炉强化冶炼、降低生铁成本的重要技术措施。

Index is the most effi - cient method while improving data query efficiency with SQL in database application , how to improve performance of flight simulation system by using index to optimize database efficiently is an emphasis .

索引技术是数据库应用中提高数据检索最有效的方法，如何有效利用索引技术来优化数据库是提高飞行仿真系统性能的一个重点。

In this case , a su ? cient condition for the existence of the optimal solu-tion is presented . Then the weight matrices of the linear quadratic performance index are derived to be parameterized expressions .

在这种情况下，给出了最优解存在的充分条件，进一步线性二次指标的权重矩阵可写成参数化表达式。

A tunable TEA CO_2 laser is used to separate D2 by multiphoton dissociation of CF_3H . The enrichment coeff cient is obtained up to 1.2x10 ~ 4 determined by gas chromatography .

用调谐TEACO2激光多光子离解CF3H分离氘同位素，用气相色谱法确定氘的浓缩系数为1.2×10~4。

In chapter 2 , we study the super-restricted edge connectedness of vertex transitive graphs , and present su ? cient and necessary conditions for connected vertex transi-tive graphs to be super - λ' .

第二章，我们研究了点传递图的超限制边连通性问题，给出了一个连通的点传递图是超限制边连通的充分必要条件。

In the inner shelf , the main geomorphic types have the accumulational plain , shoreface terrace , an - cient costal line , ancient stream channel , mamelon and pit-and-pots .

内陆架地貌主要有陆架堆积平原、水下阶地、古海岸线、古河道、小丘和坑洼群等；

We think that reforming trade statistics methodology , encouraging East Asian Free Trade Area , improving the direction of foreign direct investment and enlarging the national demand are the effi - cient ways in reducing trade deficit between the USA and China .

在此基础上提出：改善贸易统计方法，发挥东亚自由贸易区的贸易转移与贸易创造效应，加强对外资流向的引导，扩大内需，是减少美国对中国贸易逆差的有效手段。

After correlation function values corresponding to average time shift values in every time window are connected , a curve of adaptive trace gather weighting coeffi - cient may be obtained and then used to weight the data trace to which static correction has been made .

将各时窗内对应于平均时移值的相关函数值连接起来，可得到自适应道集加权系数，用来对静校正后的数据道加权。

This article studied the application of a nonlinear observ - er in the infectious disease dynamics model , made use of nonlinear observer to estimate epidemic incidence and infection rate coeffi - cient . Finally , our theoretical results are confirmed by numerical simulations .

本文研究了一类非线性观测器在传染病动力学模型中的应用，利用非线性观测器估计疾病的发生率和传染率系数，并通过数值仿真验证了以上这些结论。

Based on the assumptions of smoothness and consistency in images , the method to confirm the starting position of error is proposed , and the algorithm to detect the non-syntax errors , such as DC coeffi - cient errors , is also presented .

因此，基于图像光滑性和一致性的假设，提出了非语法错误的纹理图像的检测算法（如DC系数的错误检测算法）以及确定错误起始位置的方法。

Cient condition for the existence of splitting system ; then give an upper bound of splitting system and at the same time , we point out that this upper bound is better than the one given in [ 1 ] Theorem 4.1 when m is far greater than t .

最后利用概率方法，给出了分裂系存在的一个充分条件并对一般的t给出了分裂系大小的一个上界，并且当m>>t时，此上界优于[1]中给出的上界。

When the vibrator is in the resonance state , the ratio of moving friction coeff cient to static one will decrease to-0.1 . The driving voltage of position-gripped vibrator is only ± 80V ( Vp-p ) .

振子共振时其动摩擦系数与静摩擦系数之比降为～0.1。箝位振子的激励电压仅为±80V（峰峰值）。

Meanwhile we give the necessary and su ? cient condition for existence of best approx - imation operator on the linear manifold in arbitary Banach space , and obtain a representive of the corresponding best approximation operator by the normalized duality mapping .

还给出了一般Banach空间中线性流形上的最佳逼近算子存在的充要条件，并借助于正规对偶映射得到了相应的最佳逼近算子的表达式。

The results show that lower breakdown voltage , leakage current and better nonlinear coeffi - cient are obtained for the sample doped with nano-sol TiO2 . The breakdown voltage of grain boundary is not a constant for the ZnO – Bi2O3 – TiO2 low-voltage varistors .

对电性能结果的分析表明：在ZnO–Bi2O3–TiO2低压压敏电阻中，晶界击穿电压不是一个固定值；