二中心的

The excellent agreements between simulated and measured results prove the accuracy of the established circuit model. Moreover, the varactor was added to the resonator to adjust its resonant frequency. As expected, the reactance introduced by the varactor indeed affects the net inductance and capacitance obviously. It is noted that, not only the shift with the center frequency, the inductive or capacitive of the reactance can also provide a parameter to switch its frequency toward the two directions away from the one without varactor. As a consequence, a wideband tunable band-pass filter is achieved. Although the bad quality factor with the diode strongly increases the insertion loss, this concept was proved to be available for effectively tuning the center frequency of such a class of band-pass filter.

另外，在共振器上的varactor是用来调整共振器的共振频率，如预期的，由varactor所造成的电抗确实的影响到共振器的总电感和电容值，值得一提的是，不仅滤波器的中心频率可以被改变，这电抗是电感性或是电容性也将决定滤波器的中心频率将大於或小於未加varactor时滤波器的中心频率，利用这个结果，我们也实现了一个宽的可调频率带通滤波器，虽然不理想之二极体的Q值增加了滤波器的介入损失，但这原理是被证明可有效的用於调变带通滤波器的中心频率。

Methods 1: 8 New Zealand long-eared rabbits, equability quantity of male and female supplied by Xinjiang Medical University, compare by itself according to different time 1 the group experiment ago (n=8); 2 experimental group : the experimental group inject oleic acid from parotid vein, and observe the change of CSEP by following indexes: latency, p-p interphase, positive wave values, negative wave values, P-P values at 30, 60, 90, 120min.

方法一：取8只新西兰大耳白兔，雌雄各半，体重(2.5±0.5)kg(由新疆医科大学动物中心提供)。采用前后对照设组OA从耳缘静脉缓慢(2min内)注入0.1ml／kg体重：分别以实验前，注射OA30、60、90、120min为时限动态监测CSEP的潜伏期、峰峰时程、正波值、负波值和峰峰值。方法二：25只新西兰大耳白兔，雌雄各半，体重(2.5±0.5)kg(由新疆医科大学动物中心提供)。

Built in the 1960s, Lincoln Center is the unofficial center of the performing arts in the USA.

林肯中心建于二十世纪六十年代，是美国的民间艺术表演中心。

Exive least-squares solutions, antire?exive least-squares solutions, bisymmetric least-squaressolutions, symmetric and antipersymmetric least-squares solutions, symmetric or-thogonal symmetric least-squares solutions, symmetric orthogonal antisymmetricleast-squares solutions and their optimal approximation to the linear matrix equa-tion AX = B, and solve them successfully. 2. For Problem II, we can convert it to another problem of finding the least-squares solutions with the least norm of a new consistent matrix equation. Onthe base of the solutions of Problem I we can apply the iterative method to get

本文所构造的迭代法的优点在于先利用法方程变换将求矩阵方程的最小二乘解转化为求一个相容矩阵方程的解的问题，再利用迭代法对于任意给定的初始矩阵进行迭代，均可在有限步内迭代出所求问题的一个解；可将问题II转化为求新方程的极小范数解的问题，同样用迭代法求解，从而系统且全面地解决了问题I、II在约束矩阵类如中心对称、中心反对称、自反矩阵、反自反矩阵、双对称、对称次反对称、对称正交对称、对称正交反对称矩阵中的最小二乘解及其最佳逼近问题。

The Aquatic Center is composed of three principal entities: An external and heated sports pool of fifty meter long by twenty one meter wide, a play pool interior/external and a center of balneotherapy.

在水上运动中心是由三个主要实体：外部加热体育池五十米长的二一米宽，戏水池内部/外部和中心

Three kinds of small molecular copper and zinc superoxide dismutase mimics were synthesized with N, N-bis (benzimidazol-2-ylmethyl) amine (N3), N, N-bis (benzimidazol-2-ylmethyl) methylamine(MN3) and N,N-bis (benzimidazol-2-ylmethyl) benzylamine(BN3) as ligands. The com-plexes were characterized by UV, IR and element analysis and the structures were proposed.

模拟铜一锌超氧化物歧化酶的活性中心，以二(2-苯并咪唑)丙烷为桥、二(2-苯并咪唑亚甲基)胺(N3)、二(2-苯并咪唑亚甲基)甲胺(MN3)及二(2-苯并咪唑亚甲基)苄胺(BN3)为配体合成了3种异双核的小分子模型化合物，并进行了紫外、红外表征及元素分析，推测了可能的结构。

This thesis focuses on studying the matrix equa-tion problem systematically, and proposed an abstract algorithm of solving the matrixequation with constraints, and established a strict convergence theory. Using this algo-rithm, we can solve the sets of matrix equation satisfying some constraint conditions,such as symmetric, antisymmetric, centrosymmetric, centroskew symmetric, re?exive,antire?exive, bisymmetric, symmetric and antipersymmetric, symmetric orthogonalsymmetric, symmetric orthogonal antisymmetric, Hermite generalized Hamilton ma-trix;So we can solve the problem with this algorithm, if the set of constrain matrixcan make a subspace in matrix space, and this algorithm also can solve the optimalapproximation and least squares problem. So this abstract algorithm has universal andimportant practical value.

本篇硕士论文系统地研究了此类问题，并找到了求解约束矩阵问题的抽象算法，并建立严格的收敛性理论，利用这一算法可求解约束条件为对称矩阵、反对称矩阵、中心对称矩阵、中心反对称矩阵、自反矩阵、反自反矩阵，对称正交对称矩阵、对称正交反对称矩阵、双中心矩阵、Hermite广义Hamilton矩阵等；可以说只要约束矩阵集合在矩阵空间中构成子空间，都可以考虑用此算法求解，而且这一算法还能把矩阵方程解及其最佳逼近，最小二乘解及其最佳逼近统一处理，因此本文算法有普适性和重要的实用价值。

The results of catalytic activity show that both Ni-B and Ni-P sample have the same kinetic equation for hydrogenation of 1, 3-cyclopentadiene to cyclopentene and the same TOF. Therefore, it can be suggested that they have the similar active site. The catalytic activity of Ni-B sample is higher than that of Ni-P sample, and it is due to the more active sites of Ni-B sample having.

催化活性测试表明，Ni-B与Ni-P催化环戊二烯加氢反应对环戊二烯具有相同的动力学方程，而且两者具有相似的氢转换频率，表明两者的活性中心本质上是相似的，类金属不同导致的电子转移方向的不同仅仅影响反应的初活性，宏观活性的差别在于两者活性中心数量的不同。

Both were measured using X-ray single crystal diffraction. For the crystal in MeOH, X-ray in compound. In an ansymmetry unit, there are two Cu atoms, two ligands and twosolvent methanol molecules. The tetranuclear complex contains two kinds of Cucenter.

本文在MeOH中得到了阶梯型四核铜骨架配合物；在THF中得到了扭曲的立方烷型四核铜骨架配合物，经晶体结构分析表明，阶梯型四核铜骨架配合物是由两个Cu2被μ~3-剪刀撑二个醇羟基O所连接形成中心对称的二铜二聚体结构。

Through the analysis of the distributions of cold pulverized coal concentration and the area of high concentration zone, it was concluded that the smaller the central air expanding angle was, or the later the secondary air interfused, the larger the area of high concentration zone was.

通过分析冷态煤粉浓度的分布及煤粉高浓度区域面积的大小，得到：中心管扩角越小，二次风混入越晚，冷态高煤粉浓度区域面积越大；一次风率为0.2、一次风速为15 m/s、直流二次风速为25 m/s时冷态高煤粉浓度区域面积较大，有利于降低NOx的生成；内二次风旋流开度减小较外二次风旋流开度减小对冷态高煤粉浓度区域面积的影响大；内旋流强度为1.35、外旋流强度为1.56为最佳的试验工况。

We have no common name for a mime of Sophron or Xenarchus and a Socratic Conversation; and we should still be without one even if the imitation in the two instances were in trimeters or elegiacs or some other kind of verse--though it is the way with people to tack on 'poet' to the name of a metre, and talk of elegiac-poets and epic-poets, thinking that they call them poets not by reason of the imitative nature of their work, but indiscriminately by reason of the metre they write in.

索夫农 、森那库斯和苏格拉底式的对话采用的模仿没有一个公共的名称；三音步诗、挽歌体或其他类型的诗的模仿也没有——人们把&诗人&这一名词和格律名称结合到一起，称之为挽歌体诗人或者史诗诗人，他们被称为诗人，似乎只是因为遵守格律写作，而非他们作品的模仿本质。

The relationship between communicative competence and grammar teaching should be that of the ends and the means.

交际能力和语法的关系应该是目标与途径的关系。