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In Chapter 3, by using the technique of finite dimensional approximation of Seiberg-Wittentheory, the equivariant K-theory and some other methods, we study the problem of topologicalrestriction when there are smooth groups acting on Spin 4-manifolds such as the alternatinggroup A_5, cyclic group Z_6 and symmetric group S_3 with actions of odd type, consequently weimprove Furutas 10/8 theorem under the condition of group actions.

第三章运用Seiberg-Witten理论的有限维逼近技巧和等变K-理论等工具,研究了Spin 4-流形X上分别存在光滑交错群A_5、循环群Z_6和奇型三阶对称群S_3作用时,X的拓扑限制问题,在群作用下改进了Furuta的10/8定理。

The cylinder head intake and exhaust ports and intake and exhaust manifolds are shape optimized for better volumetric efficiency .

气缸盖进气和排气的港口和进气口和排气管的形状更好的容积效率的优化。

We generalizes the concept of the parallel rays of Euclidian space to a complete noncompact Riemannian manifolds and discuss its properties. The above quasilinear degenerate parabolic equation arises from physics,mechanics, biology and finance etc fields.

上述拟线性退化抛物方程来源于物理、力学、生物和金融等许多领域,研究该方程解的存在性、唯一性和稳定性及其他性质具有广泛的意义。

Based on theanalysis of topology structure of parallel mechanisms and using differential topology anddifferential manifolds as mathematical tools, we propose a new classification method. Thismethod classifies singularities of parallel mechanisms into two basic types, i.e. topologysingularity and parameterization singularity. This kind of classification has clear physical andmathematical meaning and fully reveals the characteristic of configuration space of parallelmechanisms.

采用微分拓扑和微分流形等现代数学工具,在对并联机构位形空间的拓扑结构进行分析的基础上,提出了一种新的奇异位形的分类方法,即把奇异位形分为拓扑奇异位形、参数化奇异位形两种类型,这种分类方法充分体现了并联机构位形空间的特点,具有十分明确的物理和数学意义。

Connected topological manifolds have a well-defined dimension; this is a theorem rather than anything a priori .

连接拓扑流形的具有明确的层面,这是一个定理,而不是任何先验。

The pressure hydrophone array manifold can be divided into two subarray manifolds,which constitute a rotation pair,and the rotational invariant factors comprise the source's direction cosine.

其中声压水听器阵可以被划分为2个子阵,它们构成旋转对,旋转因子为包含某一轴方向余弦信息的相位延迟因子。

The velocity hydrophone array manifold can also be divided into two subarray manifolds,which constitute a rotation pair with the pressure hydrophone array manifold,and the rotational invariant factors comprise the source's other direction cosine.

振速水听器阵可以被划分为2个子阵,它与声压水听器阵构成旋转对,旋转因子为另一轴方向余弦。

In general, the notion of manifolds embraces both Euclidean and

一般的说,流形的概念包含了欧几里得几何和

In exterior differentiation, one studies tensors, exterior algebra, tangent bundle, tangent vector fields, one-parameter groups action on a manifold, Frobenius's theorem, tensors fields, exterior differential form, integration on manifolds, Stokes's theorem etc.

外微分部分主要涉及外代数、切丛,光滑切向量场,单参数变换群,光滑张量场,外微分形式,Frobenius定理,外微分形式的积分,Stokes定理及其应用等。

The fact that the theory of invariant manifolds was used in the design of the Genesis trajectory in no way diminishes the work of Robert Farquhar and others on earlier Lagrange point missions.

该说,不变流形理论在创世记绝不轨迹设计使用这一事实削弱了罗伯特法夸尔和前拉格朗日点其他机构的工作任务。

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Article 144 The Government of the Hong Kong Special Administrative Region shall maintain the policy previously practised in Hong Kong in respect of subventions for non-governmental organizations in fields such as education, medicine and health, culture, art, recreation, sports, social welfare and social

第一百四十四条香港特别行政区政府保持原在香港实行的对教育、医疗卫生、文化、艺术、康乐、体育、社会福利、社会工作等方面的民间团体机构的资助政策。原在香港各资助机构任职的人员均可根据原有制度继续受聘。

Small wonder, then, that the Chinese spend more in the shop than any other group of foreign visitors do .

这样的小惊喜,使中国顾客比任何国家的人消费得更多。

A heavy dark cloud presaging rain or a storm .

预兆雨或暴风雨的沉重的黑云。