查询词典 via

The acoustical radiation power is expressed as a Hermitian quadratic form, while the radiation modes is determined by general eigenvalue decomposing, and then the radiation efficiency is computed via the orthodoxy of radiation modes with regards to impedance matrix and average velocity matrix; lastly, the validity of the method is proved by pulsating sphere and radiating cube with analytical results.

先将结构的声辐射功率表示为一个正定的厄米特二次型，运用广义特徵值分解求解了复杂结构的声辐射模态，然后利用声辐射模态关于阻抗矩阵与均方速度祸合矩阵的正交性，求解了复杂结构的声辐射效率，最后用具有解析解的脉动球与辐射立方体验证了该方法的有效性。

According to the studied results at present, the studied objects are mainly thin plate and beam about sound radiation mode, a method computed sound radiation mode of complex structure is presented in this dissertation, according to the results of the previous two chapter, a theoretical method to solve acoustical radiation mode and acoustical radiation efficiency of complex structure by boundary element method and acoustical radiation theory is posed, the acoustical radiation power is expressed as a Hermitian quadratic form, while the radiation modes is determined by general eigenvalue decomposing, and then the radiation efficiency is computed via the orthodoxy of radiation modes with regard to impedance matrix and average velocity matrix; lastly, the validity of the method is proved by pulsating sphere and radiating cube with analytical results. According to results of the form three chapter, the structure sound radiation sensitivity is studied in detail, the sound radiation power of structure can be expressed as positive Hermitian quadratic form, the sound radiation sensitivity can be expressed as two parts by partial differential with respect to design variable, which are sensitivity of boundary velocity and impedance matrix, combined with the theory of FEM and BEM, the structure sound radiation can be translated to the analysis of structure dynamic sensitivity and impedance matrix sensitivity. The theory posted in this dissertation is tested by the FEM software ANSYS and the software AAS programmed by author.

在前几章的基础上，通过结构声辐射的模态理论对结构的声辐射的机理进行了深入地探讨，针对目前声辐射模态的研究对象主要是简单的板和梁类结构，提出了一种计算复杂结构声辐射模态的方法，利用前两章研究所得的结论，将边界元方法与广义特征值的理论结合起来研究了复杂结构的声辐射模态与声辐射效率，先将结构的声辐射功率表示为一个正定的厄米特二(来源：ABb7C论文0909网www.abclunwen.com)次型，运用广义特征值分解求解了复杂结构的声辐射模态，然后利用声辐射模态关于阻抗矩阵与均方速度耦合矩阵的正交性，求解了复杂结构的声辐射效率，最后用具有解析解的脉动球与辐射立方体验证了该方法的有效性。

Results suggest that bacteria present in the system are able to nitrify via a heterotrophic pathway which is named heterotrophic nitrification.

试验结果表明：影响系统SND的主要因素是进水COD/TKN和反应器中控制的混合液DO浓度。

ZnO nanorings were prepared on a large scale by a facile solution-based method at 70 ℃ for 5 h via hexamethylenetetramine(C6H12N4) and Zn(NO3)2·2H2O as the raw materials in the presence of surfactant PAM-CTAC.

以六次甲基四胺(Hexamethylenetetramine， C6H12N4)和水合硝酸锌[Zn(NO3)2·2H2O]为原料，表面活性剂聚丙烯酰胺-氯化二烯丙基二甲基铵为形貌控制剂，采用液相沉淀法合成了ZnO纳米环。

Then the problem of setting up backup channels via routing algorithm for hierarchical networks is resolved.

通过将整个可靠连接分解成级联的多个可靠段的方法，同时为域间链路和边界节点引入备用机制，较好地解决了分级递阶网络路由算法和备用通道路由条件之间的矛盾。

As an Elemental, this rolling stone gains +4 attack and can make extra swings in defense of the Hierophant via Nature's Loyalty.

身为一个元素，这颗滚石可以得到攻击加成+4而且因为导师『忠於自然』的能力而能在防卫时得到额外的攻击机会。

Occasionally, fashion attempts to edge into the arena via pilgrim-inspired black-and-white dressing (see Jil Sander's rigorously elegant high-necked white polo, skinny black pants and austere single-buttoned jackets) or fowl-esque, feather-trimmed frocks like Alberta Ferretti's and Rochas' ostrich numbers.

偶尔，时尚界试图通过受朝圣者启发的黑白服装（看看Jil Sander庄重优雅的高领白色马球衫、贴身的黑色裤子和简洁的单扣夹克）或者像Alberta Ferretti和Rochas鸵鸟毛皮上衣挤进这个圈子。

From " Ha Libo is special "," ring king " arrive " interstellar get lost " big heat, hou Xiaojiang gave clue via looking from which already,"For the word that uses British scientist Hocking, the earth is too too alone, flimsy."

从《哈利波特》、《指环王》到《星际迷航》的大热，侯小强早已经从中看出了端倪，"用英国科学家霍金的话来说，地球太孤独、太脆弱。"

Objective:To evaluate the therapeutic effect and safety of Holmium laser for the treatment of urinary calculi via ureteroscope.

钬激光腔内碎石术是近年来发展起来的一项新技术，为治疗泌尿系结石提供了又一重要手段。

The alien gives an overview, telepathically and via a holograph, to the crowd.

该外星人用心电感应和全系图示向观众作了个概述。

In the United States, chronic alcoholism and hepatitis C are the most common ones.

在美国，慢性酒精中毒，肝炎是最常见的。

If you have any questions, you can contact me anytime.

如果有任何问题，你可以随时联系我。