差

The difference model will be used to analysis the competition of cities .A study on the essential condition and development path of the difference strategy of cities is in this context.

探讨差异化战略作为21世纪城市在全球化背景下发展路径的可能性，通过建立差异化模型对城市发展战略竞争绩效进行分析，研究了实施城市差异化发展的必要条件和途径。

In order to reduce the periodic current tracking error of the deadbeat control when compensating abruptly changing nonlinear load current, a repetitive controller is plugged into the deadbeat controller. Also, the repetitive controller can alleviate the parametric dependency of the deadbeat control and eliminate the effects on compensation performance caused by the uncertainties in the system.

另外，为了降低无差拍控制对系统参数的依赖型和系统中存在的不确定性对补偿性能的影响以及减小在补偿电流变化剧烈的非线性负载电流过程中存在的周期性的局部跟踪误差，本文在无差拍控制器的基础上，又提出了基于无差拍和重复控制的复合电流控制器。

A model for finding the cryptic period of hydrological time series is proposed. The functions of the model include to apply logarithm transformation for making the sequence more stationary, to construct a corresponding auto-regression model for reducing the herteroskedasticity of residual, to determine the component of the prime period by periodogram analysis.

本文在讨论水文时序平稳性和异方差性的基础上，提出了检测水文时序隐含周期的模型，即对水文时序设计对数变换序列，提高序列的平稳性；建立相应的自回归模型降低残差的异方差性；通过对所得平稳序列进行周期图分析确定可能的主周期分量。

Model for finding the cryptic period of hydrological time series is proposed. The functions of the model include to apply logarithm transformation for making the sequence more stationary, to construct a corresponding auto-regression model for reducing the herteroskedasticity of residual, to determine the component of the prime period by periodogram analysis.

bstract 本文在讨论水文时序平稳性和异方差性的基础上，提出了检测水文时序隐含周期的模型，即对水文时序设计对数变换序列，提高序列的平稳性；建立相应的自回归模型降低残差的异方差性；通过对所得平稳序列进行周期图分析确定可能的主周期分量。

Stopped running in the system, the entire network piezometer head has reached the same trend, while reducing the differential pressure control valve through the opening best to maintain the original pressure has remained basically unchanged until the differential pressure control valve closed.

在系统停止运行时，整个网路的测压管水头有达到一致的趋势，而压差控制阀则通过减小开度竭力维持原有的压差基本不变，直至压差控制阀关闭。

The additional calculation error of measuring gas flow capacity through planimeter calculating av - erage value between differential pressure and static pressure with dual bellows differential pressure flow capacity table is discugsed in this paper .

本文讨论了从双波纹管差压流量卡片上，用求积仪求得差压和静压的平均值计算天然气流量方法所产生的附加计算误差；分析了差压和静压在不同的变化趋势下，附加计算误差的大小和方向；提出了改进和预防的建议。

In a Word, I was so prepossess'd against my going by Sea at all, except from Calais to Dover, that I resolv'd to travel all the Way by Land; which as I was not in Haste, and did not value the Charge, was by much the pleasanter Way; and to make it more so, my old Captain brought an English Gentleman, the Son of a Merchant in Lisbon, who was willing to travel with me: After which, we pick'd up two more English Merchants also, and two young Portuguese Gentlemen, the last going to Paris only; so that we were in all six of us, and five Servants; the two Merchants and the two Portuguese, contenting themselves with one Servant, between two, to save the Charge; and as for me, I got an English Sailor to travel with me as a Servant, besides my Man Friday, who was too much a Stranger to be capable of supplying the Place of a Servant on the Road.

总之，我不想走海路已成了一种先入为主的想法，怎么也无法改变了；唯一我愿意坐船的一段路，就是从加来到多佛尔这段海路。现在，我既不想急于赶路，又不在乎花钱，所以就决定全部走陆路，而且陆上旅行实在也是很愉快的。为了使这次旅行更愉快，我的老船长又给我找了一位英国绅士为伴。此人是在里斯本的一位商人的儿子，他表示愿意和我结伴同行。后来我们又找到了两位英国商人和两位葡萄牙绅士，不过两位葡萄牙绅士的目的地是巴黎。这样，我们现在一共有六个旅伴和五个仆人；那两位英国商人和两位葡萄牙绅士为了节省开支，各共用一个听差。而我除了星期五之外，又找了一个英国水手当我路上的听差，因为星期五在这异乡客地，难以担当听差的职务。

Difference set is one kind of unbounded difference poset. The existenceof the tensor products of two cancellative difference sets are investigated. It isproved that the tensor product of a Boolean algebra and a cancellative differenceset always exists.

作为差分偏序集无界推广的差分集，我们研究了它的张量积问题，证明了任何消去差分集和布尔代数的张量积一定存在。

A 2-port S-parameter measurement with the center-tap grounded is used to extract the equivalent resistance,inductance,and Q-factor.

提出了中心抽头差分电感的中心抽头等效模型，对其差分应用时的单端和差分阻抗进行推导，利用两端口S参数测试提取出等效电阻值、等效电感值和品质因数。

In the probabilistic model for wind farm, the uncertainties of wind speed is takes into account, and the real power injected and reactive power absorbed by the wind turbine are described as the function of the voltage magnitude, the slip of the induction machine and the circuit parameters of the wind turbines. In the unified iteration method, the slip of induction machine is introduced as the new correction value. The Newton-Raphson algorithm is used to solve the unified iteration of state variable and slip. Thus, the proposed method retains the quadratic convergence of the Newton-Raphson algorithm.

该风电概率模型考虑风速的随机性，将风机输出的随机有功功率和吸收的随机无功功率描述为电压幅值、异步机的滑差和风轮机的电路参数的函数；联合迭代方法中，异步风力发电机的滑差作为新的修正量被引入，使用牛顿-拉夫逊方法求解关于潮流状态变量和滑差的联合迭代，加热器因而迭代过程保持了牛顿-拉夫逊方法的平方收敛性。

As she looked at Warrington's manly face, and dark, melancholy eyes, she had settled in her mind that he must have been the victim of an unhappy attachment.

每逢看到沃林顿那刚毅的脸，那乌黑、忧郁的眼睛，她便会相信，他一定作过不幸的爱情的受害者。

Maybe they'll disappear into a pothole.

也许他们将在壶穴里消失