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A novel direction of arrival and polarization estimation of electromagnetic vector sensors mounted on the airframe is proposed based on biquaternion. The signal processing model for EM-sensor mounted on the airframe is made by biquaternion and then the eigenvalue decomposition of spectral matrix is obtained by means of the EVD of its quaternion adjoint matrix. The memory requirement for data is reduced, and more accurate estimation result is gotten by deducing the stronger orthogonality constraint between the sin- gal and noise subspaces on the field of biquaternion. The performance of the new algorithm is confirmed through numerical examples.

针对机载电磁矢量传感器阵列DOA和极化参数估计问题,提出了一种基于复四元数估计方法,该算法利用四元数建立机载电磁矢量传感器阵列信号处理模型,然后利用四元数联合矩阵的特征分解得到阵列数据相关矩阵的特征分解,一方面使得计算过程中数据的贮存量大大减少,另一方面通过推导得到信号子空间和噪声子空间在四元数域上的正交性从而使DOA和极化参数佑计的精度更高,仿真证实了本算法的有效性。

I worked to gain experience, I got an advanced degree and I got certs.

我的工作,取得经验,我得到一个更高的学位,我得到了证书。

There ae two things to aim at in life: first, to get what you

人的一生有两大目标:第一,得到你想要的东西;第二,享有你得到

The stress calculation method and strength condition of PET aerated water bottle were obtained from theory. The strength of PET aerated water bottle was simulated and calculated ANSYS. The stress graphics of the bottle with different thickness was plotted and their stress property was analyzed. The influence of axial load and grooves on bottle stress was also studied.

从理论上得到了聚酯碳酸饮料包装瓶的应力计算方法和强度条件;利用ANSYS对其强度进行了有限元模拟和计算,得到了不同厚度的聚酯碳酸饮料包装瓶的应力图,并分析了其应力特点;同时研究了轴向载荷和瓶体开凹槽对瓶体应力的影响。

The stress calculation method and strength condition of PET aerated water bottle were obtained from theory. The strength of PFT aerated water bottle was simulated and calculated ANSYS. The stress graphics of the bottle with different thickness was plotted and their stress property was analyzed. The influence of axial load and grooves on bottle stress was also studied.

从理论上得到了聚酯碳酸饮料包装瓶的应力计算方法和强度条件;利用ANSYS对其强度进行了有限元模拟和计算,得到了不同厚度的聚酯碳酸饮料包装瓶的应力图,并分析了其应力特点;同时研究了轴向载荷和瓶,婚开凹槽对瓶体应力的影响。

Some factors were found to affect the expression of aguA in E.

得到一系列突变基因并将它们成功的插入到表达载体pTrc99A和pHsh中得到重组质粒。

However, the two movements, ahimsa and vegetarianism, reinforced one another through the common concept of the disinclination to kill and eat animals, and together they contributed to the growing importance of the protection and veneration of the cow, which gives food without having to be killed.

然而,非暴力和素食主义两场运动,透过厌恶杀害和吃动物的普遍概念而彼此间得到强化,随之而来的就是致力于发展保持和尊敬母牛的重要观念,充分得到接受。

In this paper, chiral molybdenum or tungsten 2'-pyridinyl alcoholate complex catalyzed asymmetric epoxidation of cis-1-propenylphosphonic acid in H2O was reported.

目前磷霉素的生产是通过以Na2WO4为催化剂、在乙醇中以30%的H2O2将顺丙烯膦酸环氧化得到消旋产物,再利用α-苯乙胺进行拆分而得到[2,3]。

The catalyst includes: supported Ziegler-Natta catalyst of titanium halide compound and organic electron donor compound supported with MgCl2 alcoholate carrier; aluminoxane prepared with trialkyl aluminum and water; and one kind of organic electron donor, such as organosilicon compound R2Si(OCH3)2, where R is phenyl, isopropyl, isobutyl or cyclopentyl.

该催化剂包括,a一种负载型的Ziegler-Natta催化剂,即将卤钛化合物和有机给电子体化合物负载在氯化镁醇合物载体上得到的固体催化剂,b一种通过三烷基铝与水反应而制备得到的铝氧烷和c一种有机电子给体,如有机硅化合物R 2 Si(OCH 3 ) 2 ,其中R为苯基、异丙基、异丁基或环戊基。

During the Polyvinyl Alcohol producion, the product cannot be polymerized by the monomer directly. Generally, it can be obtained by alcoholysis of poly vinyl acetate in the solution of methanol.

在聚乙烯醇生产过程中,因产品不能由其单体直接聚合得到,通常采用聚醋酸乙烯在甲醇中醇解得到,该过程副产大量的醋酸甲酯。

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It has been put forward that there exists single Ball point and double Ball points on the symmetrical connecting-rod curves of equilateral mechanisms.

从鲍尔点的形成原理出发,分析对称连杆曲线上鲍尔点的产生条件,提出等边机构的对称连杆曲线上有单鲍尔点和双鲍尔点。

The factory affiliated to the Group primarily manufactures multiple-purpose pincers, baking kits, knives, scissors, kitchenware, gardening tools and beauty care kits as well as other hardware tools, the annual production value of which reaches US$ 30 million dollars.

集团所属工厂主要生产多用钳、烤具、刀具、剪刀、厨具、花园工具、美容套等五金产品,年生产总值3000万美元,产品价廉物美、选料上乘、质量保证,深受国内外客户的青睐

The eˉtiology of hemospermia is complicate,but almost of hemospermia are benign.

血精的原因很,以良性病变为主。