可表示的

Arkady Dvorkovich (Russian President's economic advisor) stated that BRIC countries shall discuss the use of the IMF's SDR as a trade currency.

德沃可维奇表示，金砖四国元首也将讨论采用国际货币基金的特别提款权作为贸易货币。

The Office of Finance says they accept as collateral only securities that have an ascertainable market value.

FHLB财务部表示，他们只接受具有可确定市场价值的抵押品。

An incremental-iterative method based on the Newton-Raphson method combined with constant arc length of incremental displacement vector is employed for the solution of nonlinear equilibrium equations. The subspace iterative method is used for the solution of natural frequencies and vibration modes for the free vibration of beam structures.

本研究推导元素的节点惯性力时，先将元素扰动位移表示成当前固定元素座标的扰动位移和旋转之函数，故可直接求得元素的节点惯性力，元素的一致性质量矩阵可由元素节点的惯性力对元素节点的加速度微分求得。

In this paper, we give explicit constructions and formulations for harmonic maps from R1,1 into classical real semisimple Lie groups by using Darboux transformation. We also discuss pluriharmonic maps from complex manifoldsinto symmetric spaces and Willmore surfaces in Sn. By converting geometric conditions satisfied by these maps into integrable systems, and using the the-ory of integrable systems, we give explicit constructions for pluriharmonic maps from complex manifolds into symmetric spaces and the Willmore surfaces in Sn respectively. Finally, we classify hypersurfaces in Sn+1 with three distinct prin-ciple curvatures and zero Mobius form using the theory of Mobius geometry. The paper consists of four chapters.

本文首先利用Darboux变换的方法给出了从Lorentz平面R~(1，1)到经典实半单Lie群的调和映照的具体构造，并给出其显式表示；其次研究了复流形到对称空间的多重调和映照及球空间S~n中Willmore曲面，将这些映照所满足的几何条件转化为可积系统，然后利用可积系统理论分别给出复流形到对称空间的多重调和映照与S~n中Willmore曲面的构造；最后利用Mōbius几何的理论给出S~(n+1)中具有三个不同主曲率且Mōbius形式为零的超曲面的分类。

To prepare studying hierarchical intelligent control system of material flows in mineral processing plant further, picturing, transition rulers, analytic methods, relevance matrix and dynamic equation, defect in applying of Petri network, fall short of orient object models applying are discussed after technology of formalization model built, non-formalization built and compound model. And Petri network system with time attribute is expanded opening network system with interface of input and output. The network system expanded with all attributes of basic Petri network model has hierarchy and recursiveness, can be analyzed with mathematical tools of network system and can deal with concurrent and asynchronously also.

为了对选矿厂生产物流递阶智能控制系统的进一步研究奠定基础，本文在讨论了形式化建模技术、非形式化建模技术和复合模型的基础上，研究和分析了Petri网的图形表示、变迁规则、分析方法、关联矩阵与动态方程、Petri网模型应用中的缺陷、面向对象模型应用中的不足，并把采用赋时的Petri网系统扩展成为对外界有输入和输出接口的开放网系统，扩展后的Petri网具有递阶性和递归性，同时保持基本Petri网的所有性质，使模型仍可采用网系统数学工具进行分析，并可处理生产物流系统中的并发性和异步性。

The innovations of this paper as follows:(1)The topological relation model between complex spatial objects is brought forward, which represented by some composite basic 9I matrix and results in general signification.(2)Time and space integrated topological model is suggested to reason about spatio-temporal change types;(3)Sweep-line algorithm is improved, and a new little circles of polyline nodes overlapped with region method is proposed. As result, it's efficient to calculate line-line, line-region and region-region topological relations.

本文的创新之处在于提出了一种能够描述复杂对象的数学表达模型，将复杂对象间的复合拓扑关系表示成基本拓扑关系的组合，具有一定的普适意义；研究了时空拓扑关系的内涵和表达方法，说明利用时空拓扑关系可隐性地实现时空变化语义的查询；对平面扫描线法进行了改进，提出了一种新的节点微小圆求交的算法，可有效地解决线面、线线、面面拓扑关系的计算问题。

NET latest 2.0 development technique, the database mean a layer adoption unify of external appearance mode, make thus the whole system structure clear in meaning, the source code self own very good performance of readability and writability, then better convenience to customer operation and development personnel next move of development work, the type of tree control and user-defined page technique of usage make the whole system person\'s machine hand over with each other the function be more outstanding.

NET最新2.0开发技术，数据库表示层采用统一的外观模式，从而使得整个系统架构明北方奔驰价格晰，源码可读可写性好，进而更好的方便了用户的操作及开发人员下一步的开发工作，树型控件和自定义分页技术的使用使得整个系统人机交互性能更为出色。

NET latest 2.0 development technique, the database mean a layer adoption unify of external appearance mode, make thus the whole system structure clear in meaning, the source code self own very good performance of readability and writability, then better convenience to customer operation and development personnel next move of development work, the type of tree control and user-defined page technique of usage make the whole system person's machine hand over with each other the function be more outstanding.

NET最新2.0开发技术，数据库表示层采用统一的外观模式，从而使得整个系统架构明晰，源码可读可写性好，进而更好的方便了用户的操作及开发人员下一步的开发工作，树型控件和自定义分页技术的使用使得整个系统人机交互性能更为出色。

NET latest 2.0 development technique, the database mean a layer adoption unify of external appearance mode, make thus the whole system structure clear in meaning, the source code self own very good performance of readability and writability, then better convenience to customer operation and development personnel next move of development work, the type of tree control and user-defined page technique of usage make the whole system person's machine hand over with each ot

NET最新2.0开发技术，数据库表示层采用统一的外观模式，从而使得整个系统架构明晰，源码可读可写性好，进而更好的方便了用户的操作及开发人员下一步的开发工作，树型控件和自定义分页技术的使用使得整个系统人机交互性能更为出色。

NET latest 2.0 development technique, the database mean a layer adoption unify of external appearance mode, make thus the whole system structure clear in meaning, the source code self own very good performance of readability and writability, then better convenience to customer operation and development personnel next move of development work, the type of tree control and user-defined page technique of usage make the whole system person's machine hand over with each other the function be more outstanding.

NET最新2.0开发技术，数据库表示层采用统一的外观模式，从而使得整个系统架构明晰，源码可读可写性好，进而更好的方便了用户的操作及开发人员下一步的开发工作，树型控件和自定义分页技术的使用使得整个系统人机交互性能更为出色。购买美国ipage主机，90天后100%全额返佣，并送10美金。点击进入了解详情

According to the clear water experiment, aeration performance of the new equipment is good with high total oxygen transfer coefficient and oxygen utilization ratio.

曝气设备的动力效率在叶轮转速为120rpm～150rpm时取得最大值，此时氧利用率和充氧能力也具有较高值。

The environmental stability of that world - including its crushing pressures and icy darkness - means that some of its most famous inhabitants have survived for eons as evolutionary throwbacks, their bodies undergoing little change.

稳定的海底环境─包括能把人压扁的压力和冰冷的黑暗─意谓海底某些最知名的栖居生物已以演化返祖的样态活了万世，形体几无变化。