引入

Based on Three Gorges Project, the following aspects about the three typical embedding manners are studied:(1) The border condition of cyclic symmetry is applied to the finite element models with contact among cushion layer, penstock and concrete. The effects of elastic modulus, thickness and placement extent of cushion layer on the stress of its around concrete are analyzed. It is suggested that the ratio of thickness to elastic modulus can be used as an important parameter in the design of cushion layer.

因此，本文结合三峡工程建设实践，在收集和总结前人经验的基础上，以大型通用有限元分析软件ANSYS为平台，对不同埋设方式的巨型蜗壳结构进行以下几个方面的研究：(1)引入循环对称边界条件，考虑垫层-钢板-混凝土之间的接触摩擦，建立有限元模型；并对垫层敷设范围、垫层厚度和弹性模量等设计关键参数进行了优化，并把"垫层弹性模量与垫层厚度之比"作为参考指标进行设计。

The presence of AM changes the cyclization reaction mechanism of copolymers from free radical to ionic.

结果表明，AM的引入改变了聚合物的环化机理，从自由基环化机理过渡为离子环化机理。

On the basis of introduction of an epicycloid parameter,δ,an equation is derived for cycloid and its screw surface in screw pump.

本文在引入外摆参量δ的基础上建立了螺杆泵摆线和摆线螺面的方程，并通过对δ的研究，提出了螺杆泵的部分设计理论。

In the aspects of research method, we took the method of preparing sol at first and then impregnating the wood to obtain ceramic-wood composite; this method made the wood use efficiently and increased the wood's weight gain percent. The ceramic-wood composite with performances of well decay resistance, dimensional stability, effloresce resistance and high strength was obtained by importing the cymene to the net of gel as the result of co-hydroxylation between MTES and TEOS. Making use of XPS ,we found that the apex of Si2p、O1s、C1s had evident chemical shift , which validated the existence of Si-O-C bonding.Key Words: Sol-gel, Ceramic-wood composite, Modified sol, Ecomaterials

在工艺方法上，采用先制备溶胶，然后浸注木材的工艺方法具有原料利用率高、提高增重率的优点；采用甲基三乙氧基硅烷和正硅酸乙酯共水解的方法，将甲基引入陶瓷化复合木材的凝胶内部，所制备的材料具有尺寸稳定性好、具有耐风化和耐腐朽性，强度高的特点；首次利用X射线光电子能谱，发现了Si2p、O1s和C1s谱峰发生了明显的化学位移，证实了Si－O－C键合作用的存在。

This model may better represent the cytokinesis process by the introduction of biochemical stimulus.

生化刺激的引入使模型描述的细胞分裂过程与实际更为接近。

Any dairy farmer will also note the rather unimpressed reaction of cows when a bull is introduced to the herd!

任何职业牧民也会注意到当公牛被引入牛群时，母牛那种相当漠视的反应。

Introducing the parametric plane, the stable map of Hill equation was drawn, i. e. the map of damped oscillation of crane load.

最后引入参数平面，绘制Hill方程稳定图，即起重机吊重做减幅摆动的图示。

By introducing the concept of ideal transmission, the expressing way of meshing force and meshing damping is given, which is the foundation of establishing complex equation of gear dynamics.

通过引入理想传动的概念，给出了弧齿锥齿轮和准双曲面齿轮啮合力和阻尼力的表示方法，这一方法是复杂动力学方程建立的基础。

Thus the author thinks it necessary to introduce the Daniell Integral systemically and discuss the characteristics of the "Expectation Language".

叙述Daniell方法的由来及引入期望语言的必要性。

Subsequently, he held the position of Head of Section for international switching at the Telecommunications Centre at Darmstadt. He then became project leader and Head of Section for the digitalization of the telephone network and the introduction of ISDN in the former Federal Ministry of Posts and Telecommunications in Bonn and then Head of Department back at the FTZ in Darmstadt for telephone and ISDN Technology, Planning, Operation, Testing and Services.

后来，他担任位于达姆施塔特的电信中心国际配电系统部负责人；随后担任项目负责人和电话网络数字化部门负责人，并成为前波恩邮电和电信部ISDN的引入者，后来在达姆施塔特的FTZ支持部门领导电话和ISDN技术、策划、运营、测试及服务等工作。

Since historical times,England ,where the early inhabitants were Celts, has been conquered three times .

从有历史以来，英国，在此地早期居住的是凯尔特人，已经被征服了三次。

Bluetooth OBEX File Transfer Enables the sending and receiving of files on your phone via Bluetooth.

蓝牙OBEX文件移动允许经过蓝牙传送和接受文件。。。。