本文研究了组合学中实零点多项式的若干问题。
This thesis is devoted to the study of several problems on real-rooted polynomials in combinatorics.
一些问题虽然不是直接关于实零点的问题，但可以转化为实零点的问题。
Although some problems are not directly about polynomials with only real zeros, it can be inverted into polynomials with only real zeros.
第二章刻画了一类满足三项递归关系的实零点多项式序列的零点位置和零点重数的关系。
In the second chapter, we characterize the relations between locations and multiplicities of zeros of a sequence of real-rooted polynomials defined by a three-term recurrence relation.
本文给出一类适合于求解多项式实零点问题的神经网络。理论分析和模拟结果都表明，这类网络可实时求解多项式实零点问题。
A neural network model for computing real zeros of polynomials is presented. Both the mathematical analysis and the experimental results show that the proposed network is effective.
至于实零点多项式的研究，更是数学本身的基本问题之一。
Polynomials with only real zeros are also a basic problem in combinatorics.
如果介电常数的虚部不等于零，则存在能量损失(不管实部为多少)，因而，可以认为该元件具备电阻性。
Finally, if the imaginary part of the permittivity is not equal to zero and so energy is lost (whatever the real part is), then the element can be thought of as having resistance.
注意：1掌握数据输入、输出基本语句；2掌握数据补零的编程要求；3掌握实信号频谱对称性原理。
Note: 1 master data input, output of basic statements 2 master data zeros programming requirements 3 grasp the real signal spectrum Symmetry Principle.
零件压实后通过烧结炉。
After compaction the components pass through a sintering furnace.
三家配售银行承诺在直至到期日的期间于营业时间内为零售债券提供作实买入报价。
The three placing Banks are committed to quoting firm bid prices for the retail bonds during business hours until the maturity date.
八家配售银行承诺于营业时间内为零售债券提供作实买入报价，直至债券到期。
The eight placing banks are committed to quoting firm bid prices for the retail bonds during business hours until the maturity date.
粉末冶金(图5.1)采用烧结工艺将金属粉末制成各种各样的零件。金属粉末放在封闭的金属腔(模具)中在压力下被压实。
Powder metallurgy (Fig. 5.1) USES sintering process for making various parts out of metal powder. The metal powder is compacted by placing in a closed metal cavity (the die) under pressure.
平顺性是振动压实机械一个重要的性能，它与驾驶员的舒适性、零部件的可靠性以及使用寿命有着密切的关系。
Ride comfort is one of prime performance of vibratory compaction machinery, which is closely relative to drivers' comfort, reliability and life of parts of machinery.
针对不同的与燃气直接接触的发动机零件，介绍了具体的测点布置方案及测试方法，并对CA6DF 1- 27型柴油机进行了实机试验。
Detailed measuring point layout schemes and test methods for the different parts directly contacting with combustion gas are introduced and tests on diesel engine CA6DF1-27are done.
针对不同的与燃气直接接触的发动机零件，介绍了具体的测点布置方案及测试方法，并对CA6DF 1- 27型柴油机进行了实机试验。
Detailed measuring point layout schemes and test methods for the different parts directly contacting with combustion gas are introduced and tests on diesel engine CA6DF1-27are done.
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