查询词典 prevent changes

Because source data is unsteadiness, the changes of data must be spread to materialized view and make it be consistency the changes of materialized view and source data. Otherwise the freshness of data in materialized view will be fall down and the authenticity and consistency of OLAP will be affected. For the maintenance problem of materialized view, an algorithm is presented and it can make the cost of materialized view recomputation be minimized.

由于源数据的不稳定性，其数据的变化必须及时传播到实体化视图中，以保持实体化视图与源数据的变化一致性，否则会降低实体化视图中数据的新鲜度，并影响联机分析处理查询结果的真实性和有效性，针对视图的维护问题，提出了实体化视图的一种维护算法，它将使视图重计算代价最小化。

Behind these changes in the course, the more important since the Song Dynasty is a refined and elegant tastes of the formation, Hans kind of rough, open, calmly traditions are gone, replaced by a fine, compact and elegant. And this change is not merely a traditional landscape changes, but society as a whole aesthetic orientation.

当然在这些变化的背后，更重要的是自宋代以来一种精致典雅审美趣味的形成，秦汉时期的那种阳刚、开阔、从容的传统正在远去，代之而来的是一种精致、小巧、典雅、内敛趣味的形成，这种变化不只是山水画传统的变化，而是整个社会的审美取向。

Two-way (or round-trip) java code editing - changes made in the Form Editor are reflected in the code, and changes made to the code are also reflected in the Form Editor.

双程 Java代码编辑-变化中的表格编辑器，反映在代码，变更后的代码也反映在表格编辑器。

We put it across that the sign of nonlinear refractiveindex changes under certain conditions if the high-order excited state contributessignificantly to the refractive index.The nonlinearity changes from self-defocusing to self-focusing if the refrangibility of the ground state is larger thanthat of the first excited state and smaller than that of the second excited state.

高阶激发态折射度贡献较大时，非线性折射率符号在一定条件下存在转化：如果基态折射度大于低阶激发态的折射度而小于高阶激发态折射度，材料发生自散焦—自聚焦转化；如果基态折射度小于低阶激发态折射度大于高解阶激发态折射度则发生自聚焦—自散焦转化。

The adaptive single Gaussian modelis used in the stable region with gradual changes and the nonparametric model is usedin the dynamic region with jumping changes.A Generalized Agglomerative Scheme isused to merge the pixels in the Variable Region and fill the small interspaces.ATwo-Threshold Sequential Algorithmic Scheme is used to group the backgroundsamples of the Variable Region into distinct Gaussian distributions.

通过在色度和亮度空间对监控背景进行有效的区域分类，在变化小的稳定区域采用简单快速的自适应单高斯模型，在变化大的动态区域采用计算复杂而有效的非参数化模型。

The main contents is: analyzing some detection method to moving target nowadays; particular studying the principle of detection moving target in SAR; analyzing SAR imaging theory and the echo model of moving target; discussing conventional SAR imaging , the movements of target cause the changes of doppler mass center and regulable frequency, and the changes cause effect the imaging result; introducing the estimation method of doppler parameter; analyzing theory of DPCA, derivating the formula needed, and validating it's validity and practicability through simulation; advancing the improved DPCA algorithm that combine the advantage of DPCA and ATI, and validating it through computer simulation; using the revision algorithm to range ambulate based on keystone transformation, and validating it through computer simulation; discussing the compensation art of SAR imaging.

主要内容有：分析了现有的一些动目标的检测方法；详细研究了SAR动目标检测的原理；分析了SAR成像理论和运动目标的回波模型；探讨常规SAR成像时，目标运动引起的多普勒质心和调频率变化，以及这些变化对成像结果的影响；介绍了多普勒参数的估计方法；分析了DPCA原理，推导所需要的基本公式，并仿真验证其有效性和实用性；提出了结合DPCA和ATI优点的改进DPCA算法，并仿真验证；探讨了SAR成像中的运动补偿技术。通过对仿真结果的分析，本文提出的方法具有一定的指导意义和参考价值。

Mine ventilation system is a multi-variable complex system, in which a roadway may result in changes in the parameters and their relative Boundary more than the wind tunnel and even the whole network of air volume changes; On the contrary, in order to make a certain amount of a wind tunnel to reach a certain required value, but also by a number of roadways in other regulatory measures taken to achieve.

矿井通风系统是一个多变量的复杂系统，其中一条巷道参数的改变可能导致与其相关的多条巷道甚至整个风网的风量发生变化；反之，要想使某一条巷道的风量达到某一要求值，也可以通过在其它若干条巷道内采取调节措施来实现。

Article : changes with the cycle relative to the national economy, the property market is also based on effective demand, investment conditions and future expectations and other factors, experiences depression, recovery and growth, prosperity and recession, cyclical changes.

文章指出：与国民经济的周期变化相对应，房地产市场也根据有效需求、投资状况、未来预期等因素，经历萧条、复苏与增长、繁荣和衰退等周期性变化。

The water vapor changes gradually weaken with height, but their relative changes reach the maximum in the upper troposphere.

但是，水汽的相对变化在对流层上层存在减少的高值中心。

We use the mathematics of adsorption and desorption to account for relative permeability and mobility changes due to the compositional and phase behavior changes in the field.

我们使用数学的吸附、解吸加以说明相对渗透率和流动的变动构图和相位的行为变化。

Tom: You are right, he worked hard all the time.

你是对的。他一直都是努力工作。

Take shortcomings,failures,and mockings of others as commonplace and a drive to complete oneself,hold your own opinion over the evalution and disscution divested from others,afterwards sink into the state of eliminate mistakes if any or encourge oneself being not being influenced by the sayinngs of others or having no ideas to do.

把缺点、失败及别人的耻笑等看成是一种常事，当成完善自己的动力，对别人的评价和议论自己心中有主见，做到&有则改之，无则加勉&，不为人言所左右或无所适从。