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To reduce the number of cross certifications, a special CA—bridge CA is specially used to build cross certifications with root CAs of every PKI domain. Through bridge CA, to set up trust relationship with other PKI domains, every PKI domain only needs to make cross certification between its root CA with the bridge CA.

但各CA之间相对独立、分散，缺少统一的管理与接口，各CA之间无法连通，信任无法传递，造成了较多的信任孤岛，给基于PKI技术的应用的拓展造成了很大困难，也限制了PKI技术的普及与良性发展。

Based on time domain Maxwell equations, the basic theory of Finite Difference Time Domain of the cartesian coordinates is introduced in detail.

本文由时域麦克斯韦方程出发，在直角坐标系下介绍了时域有限差分方法的基本原理，分析了电磁波在空间的传播规律及吸收边界的吸收效果。

Let D be a bounded domain with C(1) boundary in Cn . The authors use the locally finite open coverring of the countable strictly pseudoconvex to define a new partitions of unity of σpoint finite local holomorphic , constructed a generalized Cauchy integral formula with discrete local holomorphic kernel on the bounded domain D and applied it to solving the 52equation.

设D 是Cn 空间中具有C(1)边界5D 的有界域，本文利用D 上一个局部有限的可数强拟凸开复盖，定义了D上一个新的局部全纯的σ点有限的单位分解，建立了D上一个更一般的具有离散局部全纯核的Cauchy积分公式并获得D 上52 方程的具有离散核的解的积分表示。

Moreover, With assumption of symmetry on the domain, we show the effect of the domain topology on the number of minimal nodal solutions and give a characteristic of the number of solutions.

进一步，在假设区域具有某种对称性的条件下，研究对称性对极小变号解个数的影响，并给出解的数量的刻画。

Theory and simulation results demonstrate that the ambiguity function of the Chebyshev chaotic modulated signals is really approximately thumbtack-shape as the ideal results, thus the signal has high resolution both in time-delay domain and Doppler frequency domain, and no matter what the codes length N is.

仿真结果表明2阶Chebyshev混沌二相码的模糊函数非常逼近理想的图钉形，具有良好的测距和测速精度，且所得结呆并不依赖于所选用码的长度变化。

Based on the comparison with the acquisition algorithm in time domain,the circular correlation algorithm in frequency domain was used for fast acquiring C/A code initial phase and Dopller frequency shift of GPS signal.

在与传统的时域串行搜索捕获算法比较的基础之上，分析了利用FFT实现C/A码初始相位和载波多普勒频移快速捕获的频域圆周相关算法模型。

Iii From the point of view of fault diagnosis, the information model is given and the frequency domain, time domain and circular fluctuation characteristic of the cylinder cap vibration signal of diesel engine are analyzed.

分析了样本长度对窗谱校正精度的影响。3、从故障诊断角度出发，给出了柴油机缸盖振动信号的信息模型。

To solve the problem, the half-space is divided into two parts, creating one circular domain which included the boundary of the hill, with the rest as the second domain.

采用"契合"的思想，给出了地下孔洞与地面上的弧形凸起地形对SH波散射问题的解决方法。

Based on Chen's model about axial flow induced vibration of a rod bundle in an unbounded domain, a mathematical model concemed with circular domain is presented, and the expressions for fluid forces are given in detail.

三、基于Chen关于无界域轴向流动中棒束流致振动的模型，推导了有界域棒束轴向流致振动的数学模型，得到了关于流体力的表达式。

3D seismic migration algorithms of holding circular symmetry ;2. Assuming that the point spread function is circular symmetry and considering that the image is actually complex conjugate symmetry in frequency domain, authors establish a new cost function in frequency domain.

算法假设退化系统的点扩散函数具有圆对称性，并考虑图像的频域具有复共轭对称性，在频域里建立了新的优化判据；采用共轭梯度算法搜索判据，从而在有实际物理意义的区域中收敛于最优解；对光学成像系统常见的离焦、衍射模糊问题进行了仿真；用该算法实现了其退化图像的恢复，给出并分析了结果。

Sodium citrate; calcium carbonate; calcium hydroxide; potassium bicorbonate; magnesium carbonate; ferrous sulphate; Zinc sulphate; copper sulphate; manganese sulphate; potassium iodide; sodium selenite.

柠檬酸钠；碳酸钙；氢氧化钙；碳酸氢钾；碳酸镁；硫酸亚铁；硫酸锌；硫酸铜；硫酸锰；碘化钾；亚硒酸钠。

All this to say that I'm glad filmmaking hasn't become completely ironic. I can enjoy an ironic film as much as the next person, but they usually involve a message of some sort. One that's delivered in a smirkingly clever way that requires little in the way of talent.

所有这些都是说，我很高兴电影制作没有变成完全讽刺艺术，我可以和下一个人一样享受讽刺电影的乐趣，虽然他们经常会被划归到一定级别，技术方面不需要很高的才能。