双动

The self-centering mechanism design of bipolar endoprosthesis has advocated the use of offset centers of rotation between the inner and outer joint bearing surfaces to generate a self-centering moment on loading to prevent impingement of polyethylene rim and stem neck or cup fixed at wrong place. The design was used popularly, but the function of self-centering mechanism was discussed in very few papers. Three bipolar endoprosthesis were evaluated: UNIQHIP system, UHR system, and AML system.

双极式半人工髋关节的离心复位机构，是利用髋臼外帽的球心与股小球的球心两者在不同点，来防止发生髋臼外帽固定於髋臼中某角度卡住不动，而使股骨柄颈部固定磨损超高分子聚乙烯内衬之一边缘，进而加速超高分子聚乙烯内衬之磨耗，造成骨溶蚀与人工髋关节的松脱。

The conclusions are as follows:(1) Neologisms in each Huayu region can be classified into two major categories:self-originated and others-originated,among which the new-born words are "absolute new words" and the inherited word are "relative new words",and there are also others-originated elements in the morphemic and sense systems of new words;(2) Variation can be seen in the morpheme,formation,building and sense of new words in Huayu regions,besides individuals of new words;(3) Aggregation of current new words and compound words with one common morpheme and a same construction,together with the aggregation of synonyms and that of different senses in polysemies,reflect the relevance of the systems of new words in Huayu regions in their variation;(4) Regular participation of hinting sense of a formation element in forming and building new words is an important way of producing new sense of morpheme,and an important reason for the current emergence of words with more than one new senses;(5) Compared with ordinary words,the productivity of ways of word formation in forming new words both in general and of a particular class will change and new ways of word formation appear in Huayu regions;(6) The semantic collocation of the verbal morpheme of new verbs in a phrase has a great influence on the location of its structural center,and the complex syntactic behaviors of new verbs are related to the different processes of argument integration;(7) The processes of building new words with the same meaning differ in levels of approaches to motivation cognition,perspectives of motivation cognition,morpheme motivation and morpheme expression,etc.;(8) The lexical interaction in Huayu regions results in lexical subsystem intersections of current new words across two,three and four regions.

本文的主要结论是：(1)各华语区新词均可分为"自源新词"和"他源新词"两大类，其中的新生词和传承词分属"绝对新词"和"相对新词"，新词语的词素、词义系统中也含有他源成分；(2)除词语个体外，华语区新词在词素、构词、造词、词义等方面均体现了某种程度的变异：(3)通用词语聚合、同素同构词聚合、同义异形词聚合与一词多义聚合集中反映了各华语区新词语系统在变异中的关联；(4)构词单位经常提示词义参与构造新词是产生新语素义的重要途径，也是当代多新义词现象的重要成因；(5)相对于一般词语，构词方式在新词语中的总能产性和在某一词类中所体现的能产性都有所变化，华语区也产生了新的构词方式；(6)新动词的动素在短语中的语义搭配对结构核心的位置有很大影响，新动词的复杂句法表现与不同的论元整合过程有关；(7)同义新词造词过程的差异包括理据认知途径、理据认知角度、词素理据和词素表达等不同层面；(8)华语区的词汇互动形成了双区、三区和四区通用新词等词汇子系统交集，作为华语核心，普通话所含纳的通用词语多于各区域变体。

The servo system of a photoelectric theodolite is usually a servomechanism composed of double loops of speed and position.

光电经纬仪伺服系统一般是位置、速度双闭的随动系统，其跟踪精度和动态响应能力是衡量系统性能的重要标志。

This paper presents a dynamics decoupled simulation method in which a single-axis spin platform is employed to simul...

本文提出一种利用动力学解耦的仿真方案，用单轴平台进行细长体双自旋卫星消旋和章动控制的系统试验，验证了系统的可行性。

Factory main production: ring, wave washer, saddle-type flexible gasket, C-type snap ring, dish washer, single-ear binaural, round nut with washer stop, both within and outside the teeth, the bearings folder, plum gaskets, flexible cylindrical pin , card ring, DIN standard ring and all kinds of custom pieces of red stretch.

本厂主产：挡圈、波型垫圈、鞍型弹性垫圈、C型卡环、碟形垫圈、单耳双耳、圆螺母用止动垫圈、内外齿、轴承夹、梅花垫圈、弹性圆柱销、卡圈、DIN标准挡圈及各类冲拉伸件定制。

Protection The whole protection scheme for double-circuit lines on the same tower consists of split-phase current differential protection or split-phase composite distance carrier protection and zero-sequence directional comparison protection as main protection, and DPFC distance protection, step zones distance protection and zero-sequence directional over-current protection as backup protection.

2.2.1 。保护整个保护计划的双回线同杆包括分相电流差动保护或分相复合距离承运人的保护和零序方向比较保护为主要保护和DPFC距离保护，加强保护区的距离和零序方向过电流保护作为后备保护。

Estimate shows the resonant gaps between KAM tori can be as large as of order 〓, while the transversality which can be obtained by Poincaré-Melnikov method in the stable manifold and the unstable manifold, as best as we can hope, is only order 〓.

但在通有的摄动下，部分双曲环面会破裂，仅用Poincaré-Melnikov方法无法构造出足够长的"传递链"。

Based on rate equations, by use of a new method, a semiconductor optical amplifier theoretical model is constructed taking carrier density pulsation, spectral hole burning, stimulated emission, free carrier absorption, two-photon absorption and ultrafast nonlinear refraction effects into account.

基于速率方程采用新的推导方法得到了可以用来讨论飞秒量级光脉冲传输特性的半导体光放大器理论模型，该模型同时考虑载流子浓度脉动、光谱烧孔、受激辐射、自由载流子吸收、双光子吸收和超快非线性折射效应。

This paper was concerned with the Dirichlet-Neumann mixed boundary value problem of bipolar quantum hydrodynamic model in thermal equilibrium. By truncation method and Leray-Schauder fixed point theorem, the existence of solution to the problem is proved. In addition, the uniqueness of the solution was proved as the Plank constant was large enough.

研究了热平衡状态下双极量子流体动力学模型的Dirichlet-Neumann混合边值问题，利用截断方法和Leray-Schauder不动点定理证明了其解的存在性，另外还证明了当普朗克常数充分大时其解是唯一的。

Various types of elevators, according to the drive system, the exchange two-speed elevators, escalators VVVF exchanges, exchange regulator speed elevators, because of its low cost.

电梯的种类多种多样，按拖动系统来分，有交流双速电梯，交流变频调速电梯，交流调压调速电梯，因为它的成本低。

But we don't care about Battlegrounds.

但我们并不在乎沙场中的显露。

Ah! don't mention it, the butcher's shop is a horror.

啊！不用提了。提到肉，真是糟透了。