第二章通过举例介绍了两种证明符号模式矩阵是谱任意的方法——构造法和幂零-雅可比方法。
In the chapter 2, the author introduce two methods that method a sign pattern matrix is spectrally arbitrary, the structure method and Nilpotent-Jacobi method with examples.
分析了谱任意的相关结论并给出了两类符号模式，然后运用幂零雅可比方法证明了两类符号模式矩阵的谱任意性。
I analyse some conclusions of spectrum arbitrary and give two sign patterns. then I prove two classes sign pattern matrix that are spectrally arbitrary using Nilpotent-Jacobi method.
国际第四纪联合会（INQUA）1005计划旨在召集资深及年轻的研究员进行波兰及乌克兰西部地区黄土的研究，将先进的和可比方法应用到联合研究中。
The aim of INQUA project 1005 is to assemble experienced and young loess researchers to study loess in Poland and western Ukraine and to apply advanced and comparable methods in joint research.
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