四复的

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。

We have equipments as : Man Roland 700 five colors, Man Roland two colors, Heidelberg bisect four colors and full-auto paper pasting machine, full-auto high-speed box adhibiting machine, glazing machine, UV machine, film coating machine, bookbinding machine, full-auto foldout machine, bronzing machine, model machine…. We can do the best to meet any needs of craftwork, fit any multilayer printing.

公司主要印刷设备有：北人YP4890八色轮转机、C800商业轮转机、德国罗兰700五色、日本三菱四色、德国海德堡对开四色、罗兰双色、日本小森对开单色印刷机及全自动彩盒裱坑机、全自动大小粘盒机、过油磨光机、UV机、装钉机、台湾全自动多功能折页机、烫金机、复膜机、啤机等全套印刷前后工序设备多台，能满足客户各种工艺要求，适应各种多层次印刷，这是我们为客户提供高品质，高效率，优质服务的信心保证。

Furthermore, we express a real quaternionic polynomial with four general polynomials which have real coefficients, thus build direct relation between real quaternionic polynomials and general polynomials.

新方法以四元数的复表示及其可对角化的特征结构为理论基础，将问题等价为求解2×2矩阵多项式的可对角化解；进一步将四元数多项式用四个实系数多项式表示，建立了四元数多项式与一般多项式的直接关联。

In chapter 4,we introduce the basic properties for pluripotential theory and results about the existence of weak solutions. Then we prove the existence of weak solution in some special domain which is not strictly pseudoconvex.

第四章我们先介绍多重位势理论的一些基本知识，然后介绍复Monge-Ampere方程在严格拟凸域上的已有的两个重要结论，之后讨论一类特殊的非严格拟凸域上复Monge-Ampere方程弱解的存在性。

In this thesis , we use electronical TDM and optical WDM to realize a quadruplex system of digital video fiber transmission .

本文利用电时分复用和光波分复用的方式实现了四路数字视频信号的单光纤传输，并设让出了两路实验系统电路。

The extreme pressure performance of sodium tetraborate and potassium tetraborate were studied by cooperating with inorganic salts in aqueous solution,and the wear scar's surfaces were analyzed by SEM and EDX.

以四硼酸钠和四硼酸钾为主要对象，研究了硼酸盐与无机盐复配后在水介质中的极压性能变化规律，并用扫描电镜和X射线能谱分析了磨斑表面形貌和元素组成。

Moreover, D-sodium gluconate was mixed with other substances and used as corrosion inhibiting admixtures. The admixture of D-sodium gluconate and sodium tetraborate has the best inhibiting effect among these mixed inhibitors.

复配试验表明，D—葡萄糖酸钠与四硼酸钠组成的复合缓蚀剂缓蚀效果最好，而与甘氨酸和乙醇胺复配的缓蚀剂也表现出较好的缓蚀效果。

By using the methods of complex representation of quaternion matrices and companion vector, we study and simplify the numerical calculation methods of quaterinon matrices, and establish new aigebraic methods in quaternionic quantum mechanics.

我们通过四元数的复表示和友向量方法，研究并解决了四元数矩阵的一系列数值计算问题，给出一套四元数量子力学中的数值计算方法。

Histological observation showed that normal structure was observed in all the groups before being harvested or after being preserved for 30 minutes. However, the more severe structure damage was observed in HPCs or hepatic sinusoidal cells with the more prolonged rewarm ischemia.

形态学观察发现，四组供肝于离体前及低温保存30分钟时的组织结构均无明显异常改变；而在复温缺血期间，各组供肝肝实质细胞及肝窦内皮细胞则表现有不同程度的结构损伤，且在程度上也与复温缺血时间呈明显的平行关系。

Eight years of continuously updated modern printing equipment, train a number of high-quality printing of highly skilled technical personnel, has the introduction of foreign advanced printing equipment, now has produced outside of Japan Mitsubishi four-color, produced in Sweden Fourth, sauna open four-color, and monochrome machines 08,03 and self-adhesive labels, bar code printing machines, equipped with beer, hot, sticky, mounted boxes, folding, binding, wire-bound, including chiropractors, YO binding, rehabilitation membrane, UV had a full set of oil after the process.

八年来不断更新现代化印刷设备，培养出一批高素质高技能的印刷技术人才，先后引进国外先进印刷设备，现拥有日本出产的对开三菱四色、瑞典出产的四开桑拿四色，以及单色08、03和不干胶标签机、条形码印刷机型，配备啤、烫、粘、裱盒、折页、胶装、线装、包脊、YO装订、复膜、UV过油等全套后工序。

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。