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In this topic, the dynamic analysis methods for piezoelectric vibrator are studied systematically based on the theoretical model, FEM numerical experimentation and FEM governing equation for given compound-mode vibrator, and some valuable conclusions are obtained. The main work accomplished is summarized as follows: 1.Elaborate the main modeling methods for piezoelectric vibrator and the significance and necessity to study the dynamic characteristics of piezoelectric vibrator which emphasize the urgency of this paper. 2.Take the bending deformation induced by piezoelectric ceramic as example, the energy transfer mechanism of electric energy to mechanical energy are analyzed; the motion and force transfer mechanism are analyzed for the longitudinal-bending vibrator. 3.Based on mode assumption and Hamilton principle, the coupling model of piezoelectric vibrator of linear USM is built; moreover, the equivalent circuit model is obtained and a coupling equation represents the relation between electric parameters and mechanical parameters is derived which provides foundation to match the vibrator and driving circuit. 4.Combine the constitutive equation of piezoelectric ceramic with elastic-dynamical equation, geometric equation in force field and the Maxwell equation in electric field and the corresponding boundary condition equation, the FEM control equation for piezoelectric vibrator of USM to solve dynamic electro-mechanical coupling field is established by employing the principle of virtual displacement. The equation lays the foundation to study the non-linear constitutive equation of piezoelectric ceramic driven by high-power. 5.Define the dynamic indexes of characteristic of vibrator and carry out variable parameters simulation by calculating the model parameters and the electric characteristics of vibrator are simulated according to the equivalent circuit model. By numerical experimentation, the working mode of vibration of vibrator and the shock excitation results of the working frequency band which provides the mode frequency to realize bimodal are analyzed. Detailed calculation of the electro-mechanical coupling field parameters is made by programming the FEM control equation.

本课题从理论模型、有限元数值试验、有限元控制模型等方面以复合振动模式振子为例对超声电机压电振子的动力学特性及其分析方法进行了全面系统地研究,得出了许多有价值的结论,主要概括如下: 1、阐述了目前针对超声电机压电振子的主要建模方法,对压电振子动态特性的研究意义和必要性进行了论述,突出了本文研究内容的迫切性; 2、以压电陶瓷诱发弹性体发生弯曲变形为例,分析了压电陶瓷通过诱发应变来实现机电能量转换的机理;对基于纵弯模式的压电振子的运动及动力传递机理进行了分析; 3、基于模态假定,利用分析动力学的Hamilton原理,建立了面向直线超声电机压电振子的机电耦合动力学模型,并据此建立了压电振子的等效电路模型,导出了电参量与动力学特性参量的耦合方程,为压电振子与驱动电路的匹配提供了依据; 4、从压电陶瓷的本构方程出发,综合力场的弹性动力学方程、几何方程、电场的麦克斯韦方程以及相应的边界条件方程,采用虚位移原理,建立了压电振子动态问题机电耦合场求解的有限元控制方程,为研究其大功率驱动下的非线性本构模型奠定了基础; 5、界定压电振子的动力学特性指标,对压电振子的机电耦合动力学模型参数进行计算及变参数仿真;依据等效电路模型,对压电振子的电学特性进行了仿真分析;通过有限元数值实验,对压电振子工作模态附近的模态振型及工作频率附近的频段进行了激振效果分析,找出了实现模态简并的激振频率;利用有限元控制方程,通过编程计算,对压电振子的力电耦合场参数进行了详细计算,得出了一些有价值的结论。

Field experiments demonstrated that efficacy of 30% dichlorvos and omethoate for Caloptilia dentata was over 80%, for Drosicha corpulenta was 95.9% and Psylla willieti 96.4%. For Parathrene tabanifomis, Anoplophora glabripennis, Apriona swainsoni and Panonychus ulmi also gained perfected efficiency, and injection dosage of 2.0ml/cm φ for Myzus persicae obtained 100%result, for Eriococcus lagerostioemiae which damage Punica gianatum the result was 92.96%. In all, the efficiency of 30% diohlorvos · omethoate control of most pests was better than bisultap, decis, acephate, nicotine and avermectin, etc.

田间防效结果表明30%敌畏·氧乐对元宝枫细蛾的防治效果可以达到80%以上,对草履蚧和槐木虱防效分别大于95.9%和96.4%,对白杨透翅蛾幼虫、危害新疆杨和合作杨的光肩星天牛幼虫、危害国槐的锈色粒肩天牛幼虫、危害苹果的榆全爪螨等可达到理想防效,当施药剂量为2.0 ml/cmφ时对桃蚜的防效达100%,对危害石榴的紫薇绒蚧防效可达92.96%以上。30%敌畏·氧乐对大多数害虫的控制作用优于杀虫双、敌杀死、乙酰甲胺磷、烟碱和阿维菌素等。

This is, for China and other multiracial countries, very positive and may give some solutions for the future. In the introduction there is an explanation of the reason why I choose this title and also the questions about Switzerland in the field of present research and the meaning of those researches. The first part describes the formation of the community of Switzerland, and there I define the word "community" and the peculiarity of each member of this community, the time the Swiss people take to build this community. The second part describes this formation with more details like geographical problem, language differences, the psychological pugnacity for liberty, the practical art of neutrality and the freedom for religious behavior. Those themes prove the formation of the Swiss community. The third part contains the following topics: the international position of Switzerland and its stability, the balance of economic production, the foundation of the Swiss government and the charm of its feature. For those topics I use the economic, political and cultural angle.

全文分为瑞士多民族社会的形成,在这一部分中重点介绍了民族和民族共同体的界定,瑞士各民族的地理分布及主要特征,瑞士民族共同体形成的历史时间断限,在这一部分中特别提出了民族共同体的概念,为全文的行文打下一个概念基础;在瑞士民族共同体形成的表现部分中,共分为语言和地域差别问题的消弭,崇尚独立自由的心理素质的确立,中立外交政策的奉行,宗教多元化的制衡等几个小的部分,四个部分平衡并立,共同来论证瑞士民族共同体的表现;在瑞士民族共同体诞生的原因中,共分为以下几个部分,有瑞士特殊的国际地位与多民族社会的稳定,平衡发达的经济及其吸引力,多元政治体制的建构和灿烂文化和性格的魅力,也就是从政治、经济和文化三个角度对这个问题进行了阐述;在现代瑞士多民族社会问题部分中,有如下几个部分瑞士的外来人口在瑞士国家的生活状况,外来人口融合中的困难,以及瑞士民族共同体中其他的一些社会问题,主要探讨的是瑞士社会中的外国人的生活状况,以及在融合和同化的过程中的成功经验以及给整个瑞士社会带来的几个突出的社会问题;最后是对现代瑞士多民族社会问题的思考,也就是从和睦性,认同感以及民族平等政策三个角度中进行的分析。

Thus there are multitudes of men and women who though living in the world are not of it, who have no liking or taste for worldly display, though often compelled by their position, social or otherwise, to assume it, who avoid worldly advancement or honour not out of pusillanimity, but out of unconcern, or contempt, or knowledge of its danger; who, with opportunities for pleasure, practise penance, sometimes of the most rigorous character who would willingly, if it were possible, give up their lives to works of charity or devotion, who love the poor and dispense alms to the extent of, and even beyond, their means, who have strong attraction for prayer, and who withdraw from the world when it is possible for the meditation of divine things; who frequent the sacraments assiduously; who are the soul of every undertaking for the good of their fellow -men and the glory of God; and whose dominant preoccupation in the advancement of the interest of God and the Church.

因此有众多的男人和女人谁,虽然生活在世界上是没有的,谁不喜欢或品味为世俗显示,虽然往往强迫他们的立场,社会或否则,承担它,谁避免世俗的提高或荣誉并非出于pusillanimity ,而是出于漠不关心,或蔑视,或了解其危险;谁,有机会很高兴,实行penance ,有时最严格的性格谁会心甘情愿地,如果有可能,放弃他们的生命工程慈善或奉献,谁爱穷人和免除施舍来的程度,甚至超越,他们的手段,谁有强烈的吸引力,祈祷,以及谁退出,世界时,是有可能的冥想神圣的事情,谁频繁圣礼刻苦;谁是灵魂,每一个承诺为好,他们的同胞男子和神的荣耀,而且其优势专注在提高的利益,上帝和教会。

Based on the information-scheduling models and time-delay models of networked control system, state-estimate-based and parity-relation-based fault diagnosis approaches and passive fault-tolerant control such as integrity control for networked control systems are presented; 2 we presented new models, Quasi T-S models, for linear and nonlinear networked control systems with random time delays, and the corresponding fault diagnosis and fault-tolerant control approaches; 3 With all these fault diagnosis theory presented, active fault tolerant control approaches are developed directly for networked control systems; 4 Some analysis, design and optimization theory for networked control systems are presented., such as robust control, LQ guaranteed cost control, modeling and control for stochastic networked control and integrated optimization etc.

给出了诸如网络化控制系统的鲁棒控制、LQ保成本控制、联合优化设计、随机网络化控制系统的建模与控制等方面的结果。

The paper declaration form for import goods is submitted in quintuplicate, consisting of a page for customs operation, a page for the customs to keep, a page for the enterprise to keep, a page for customs verification and writing off, and a page certification respectively.

进口货物纸质报关单一式五联:海关作业联、海关留存联、企业留存联、海关核销联、证明联。出口货物纸质报关单一式六联:海关作业联、海关留存联、企业留存联、海关核销联、证明联、证明联。

The paper declaration form for import goods is submitted in quintuplicate, consisting of a page for customs operation, a page for the customs to keep, a page for the enterprise to keep, a page for customs verification and writing-off, and a page certification respectively.

进口货物纸质报关单一式五联:海关作业联、海关留存联、企业留存联、海关核销联、证明联。

Article 14 In the case of applying for extending the time limit for the re-importation and re-exportation of goods, the holder of ATA carnet or consignor or consignee of goods temporarily imported or exported under non-ATA carnet shall, not later than 30 days prior to the expiry of the prescribed time limit, apply to the customs office which examines and approves the temporary importation or exportation of goods for extending the time limit and submit an Application for Extension of the Time Limit for the Goods Temporarily Imported / Exported (See format in Annex 4) and other relevant application materials.

第十四条暂时进出境货物申请延长复运出境、进境期限的,ATA单证册持证人、非ATA单证册项下暂时进出境货物收发货人应当在规定期限届满30日前向货物暂时进出境申请核准地海关提出延期申请,并提交《货物暂时进/出境延期申请书》(格式文本见附件4)以及相关申请材料。

Therefore, we keep a high visa capacity in Fuzhou- a high-risk area for applying for the visa, the visa capacity of 95% for British and Australian and 100% for American in our Xiamen branch. For some complicated cases, we also got visa successfully through reapplication.

因此在福建这个拒签率极高的地区,博纳森保持了较高的签证率,自成立至今,我们公司英澳项目达到95%的签证率,厦门地区美国的签证率是100%的,比较复杂的个案经过二签一般都能顺利通过。

The goal of cities which try to be creative is to create conditions which are open enough so urban decision makers can: Rethink potential such as turning waste into a commercial resource; revalue hidden assets such as discovering historic traditions that can be turned into a new product; reconceive and remeasure assets such as understanding that developing social capital also generates wealth; reignite passion for the city by for example developing programmes so people can learn to love their city; rekindle the desire for learning and entrepreneurship by for instance creating learning modules much more in tune with young peoples' desires; reinvest in your talent by not only importing outside talent but fostering local talent; reassess what creativity for your city actually is by being honest about your obstacles and looking at your cultural resources afresh; realign rules and incentives to your new vision rather than seeing your vision as being determined by existing rules; reconfigure, reposition and represent where your city stands and by knitting the threads together to retell your urban story that galvanises citizens to act.

城市发挥创意的目的在於,创造足够开放的情境,让城市决策人士能够做到如下的事项:重新思考各项潜在可能,例如将垃圾转化成商机;重新赋予隐性资源价值,例如将历史传统转化为新的产品;重新构想、衡量资源,例如认知到发展社会资源,同时也能造就财富;重新点燃城市的热情,例如策划活动,让大家学习爱自己的城市;重新挑起学习与创新的欲望,例如设计学习模式,贴近年轻人的脉动;重新投资自己的人才,不要只是依赖外国人才,而是培养在地人才;则新评估自己城市的创意为何,例如诚实面对自己的障碍,并从新鲜的角度来看待自己的文化资源;重新整合规范、动机,运用新的视野,而非被动受限於既定规范;重新装配、定位、呈现自己城市的现状,编织自己的都会故事,重新诉说,驱使市民采取行动。

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相关中文对照歌词
Wait For You (Song For The Ocean)
Do It For You, Do It For Us
One For You, One For Me
One For My Baby (And One More For The Road)
Forever, For Always, For Certain
One For My Baby (And One More For The Road)
Thank Heaven For Little Girls / You Were Meant For Me / A Fellow Needs A Girl
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For You, For Me, For Evermore
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推荐网络例句

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。

There is no differences of cell proliferation vitality between labeled and unlabeled NSCs.

双标记神经干细胞的增殖、分化活力与未标记神经干细胞相比无改变。