查询词典 mechanical

Since a proposed application of Dirac structures is to the reduction of some mechanical systems, the reduction of Dirac structures is considered in detail in this paper, without using the existence of momentum mappings or the introducing of the notion of admissible function, etc..

因为引入Dirac结构的—个基本目的即应用于一些力学系统的约化，本文详细地讨论了Dirac结构的约化问题，包括其在Poisson流形以及Jacobi流形等的约化中的重要应用，重点利用了Dirac结构的特征对以及对偶特征对的工具，从而避开了讨论矩映射的存在性以及容许函数等一些复杂概念的介入。

Idealism and mechanical materialism, opportunism and adventurism, are all characterized by the breach between the subjective and the objective, by the separation of knowledge from practice.

唯心论和机械唯物论，机会主义和冒险主义，都是以主观和客观相分裂，以认识和实践相脱离为特征的。

The market makes high demands on the function of the aerator, so it is necessary to improve the design method and skill, to make innovation design of the aerator, and to advance the mechanical property, the reliability, the economical performance and the property of use.

同时，市场对曝气机的功能提出了更高的要求，需要改进设计方法和手段，进行曝气机的创新设计，改善现有产品的技术性能、可靠性、经济性以及使用性能，满足生态环境保护的新需要。

Hydrophytes show certain adaptations to such habitats, notably development of aerenchyma, reduction of cuticle, root system, and mechanical and vascular tissues, and divided leaves.

水生植物表现出适应水生的特性：具有发达的通气组织；表皮、根系、机械组织、维管组织退化；叶片分裂；叶片、根和茎中均具有通气道或气腔。

We can only make a rough estimation because nobody has a 2009 package, and the idea obviously is not to make Formula One faster, but to shift between aerodynamical grip and mechanical grip.

我们只能估一个大致的估计，因为没有人有2009年的赛车，而主意显然不是为了使F1更快，而是在空气动力学抓地力和机械抓地力之间转换。

Experiment results indicate that the mechanical and aerodynamical performances on the new two-stage axial-flow compressor have met the design requirements.

运转试验及性能考核表明，双级轴流压气机实验台在机械性能和气动性能两个方面均达到了预定的设计要求。

High purity aluminum or allumen (including 1% Zn, mass fraction) alclad on 2024 aerolite is usually employed for improving corrosion resistance. This alclad will greatly impact the mechanical properties of friction stir welded joint.

为提高2024航空铝合金材料的抗腐蚀性能，在其表面通常包有一层高纯铝或含Zn 1%的锌铝合金，包铝层在搅拌摩擦焊时会对接头的性能产生较大的影响。

School of Mechanical Engineering and Automation, Beijing University of Aeronautic and Astronautic, Beijing 100083

北京航空航天大学机械工程与自动化学院，北京 100083

School of Mechanical Engineering and Automation, Beijing University of Aeronautics and Astronautics, Beijing 100083, China

北京航空航天大学机械工程及自动化学院，北京 100083； 2。北京邮电大学自动化学院，北京 100876

It has been used widely in automotive,aerospace,mechanical and electronic industry for its efficiency and precision.

精锻技术在汽车、宇航、机械、电子等支柱产业的发展中得到了广泛的应用。

This one mode pays close attention to network credence foundation of the businessman very much.

这一模式非常关注商人的网络信用基础。

Cell morphology of bacterial ghost of Pasteurella multocida was observed by scanning electron microscopy and inactivation ratio was estimated by CFU analysi.

扫描电镜观察多杀性巴氏杆菌细菌幽灵和菌落形成单位评价遗传灭活率。