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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。

Many isoxazole heterocycle compounds have efficiency or super-efficiency in controlling the growth of weeds.

异恶唑杂环化合物在专利报道中出现许多高效或超高效的新品种。

Is one of the earliest professional development and production of electric vehicle speed controller of the private scientific and technological enterprises, the company has a strong professional design and production capacity, products have been a number of brands for the domestic electric vehicles matching efficiency and performance are better than ordinary products, annual production capacity of 200,000 sets, the company has brush controller, using pwm control, high efficiency, with over-current, current limiting, undervoltage,"speed" a wide range of protection features Special high-power brush has controller using the latest electric vehicles for the use of high-life relays and intelligent anti-Speed circuit.

溧阳爱斯特自控器材科技开发有限公司是国内最早专业开发生产电动车调速控制器的民营科技企业，公司具有较强的专业设计及生产能力，产品已为国内诸多品牌电动车配套，其效率及性能均优于一般产品，年生产能力二十万套，本公司生产的有刷控制器，采用pwm 控制，效率高，具有过流、限流、欠压、"飞车"多种保护功能，特别大功率有刷控制器采用最新专供电动车使用高寿命的继电器及智能防飞车电路。

This measuring system displays some remarkable merits, such as synthesis,automatization,intergration,continuity and on-line and is further able to improve the efficiency of testing,reliability and accuracy of testing data, results, solving the shortcomings of traditional test methods,such as scattered, low efficiency and high-test errors.

该系统具有综合、自动、集成、连续、在线的突出优点，大大提高测试效率、测试数据和结果的可靠性、准确性，解决了传统测试方法的分散、效率低和测试误差大的缺点。

So a kind of two-grade dust catcher system with higher efficiency, convenience and mechatronic is studied. The designed dimension of the first- grade cyclone separator is optimized by using MATLAB optimization toolbox. New designed cyclone separator has lower resistance loss, higher efficiency, compact structure and less volume; The mathematical model of hydrometry is b...

在其一级旋风除尘器的尺寸设计中采用MATLAB的优化工具箱进行优化，经过试验证明，新设计的旋风除尘器为低阻高效除尘器，并且结构紧凑体积小；在二级文氏管除尘器中，根据其节流特性，结合流体力学原理，建立起流量检测的数学模型，据此引入与之配合的传感器和单片机系统，实现了流量的动态显示，为除尘设备机电仪一体化的研究奠定了基础。

Using system analytical method, a mathematical model for evaluating the efficiency of gas-distribution piping system was established, and the illation was made about efficiency of it in the realm of evaluation.

利用系统分析方法，建立了评价配气管网系统效率的数学模型，并延伸出评价区域配气管网效率的数学模型。

In the same time, this paper measures the production functions of each industry, the result is the industries capital efficiency low, the margin efficiency of capital is low, especially attach little importance to the immateriality capital.

同时本文还利用截面数据度量了股票市场各个行业的生产函数，认为我国股票市场的行业资源利用效率低下，资本的边际效率水平不高，尤其对于无形资产不够重视。

Allocation scale and structure of public finance is the key for the equilibrium and balance between efficiency and justice, for that immoderate justice allocation will affect efficiency.

但公平与效率之间有个转化和平衡关系，过度的分配公平会损害财富创造的效率，所以，公共财政分配应该有一个适度的规模和合理的结构，既要满足广大社会成员的基本生活保障，又不能削弱社会成员工作和创造财富的积极性。

We discusses that the imperativeness and feasibility as well necessity of developing high water use efficiency agriculture in china at these aspects: security of grain and economy and water resource, agriculture resource in North and South of China, regulating agriculture structure, agronomic methods for drought resistance and water saving, crop high yield breeding and high efficiency water resource management.

从粮食安全和经济安全及水安全，南北方农业资源，农业结构调整，农艺抗旱节水措施，作物高产育种，高效的水管理体系等方面，论述了发展高水效农业发展的迫切性、可行性和必然性。

Chapter 4,based on strong efficiency rather than efficiency or weak effi-ciency,discusses the similar problem to chapter 3.The concepts of strongsupremum and strong infimum for the set in finite-dimensionalEuclidean space are given,s-conjugate functions and s-subdifferentials theory is developed,by means of which,the duality problem ofmulitobjectivre programming for strong efficient solutions or called absoluteoptimal solutions is analysed,and a new duality theory-s-conjugateduality theory is proposed.

第四章，基于强有效性而不是有效性和弱有效性，给出了类似于第三章的结果，提出了有限维欧氏空间中集合的强上、下确界等概念，研究了点集映象的强共轭函数和强次微分问题，建立了点集映象的s-共轭函数及其s-次微分理论，并借助于这一理论，讨论了多目标规划关于绝对最优解或称强有效解的对偶性问题，建立了基于强有效性的s-共轭对偶理论。

According to the clear water experiment, aeration performance of the new equipment is good with high total oxygen transfer coefficient and oxygen utilization ratio.

曝气设备的动力效率在叶轮转速为120rpm～150rpm时取得最大值，此时氧利用率和充氧能力也具有较高值。

The environmental stability of that world - including its crushing pressures and icy darkness - means that some of its most famous inhabitants have survived for eons as evolutionary throwbacks, their bodies undergoing little change.

稳定的海底环境─包括能把人压扁的压力和冰冷的黑暗─意谓海底某些最知名的栖居生物已以演化返祖的样态活了万世，形体几无变化。