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Extract information based on the instantaneous features : In the center is one of the instantaneous rate of the power spectral density of the maximum, is a center to the absolute value of the instantaneous rate of the standard deviation, Non-zero weak signal instantaneous phase of the nonlinear component absolute standard deviation, Non-zero weak signal instantaneous phase of the nonlinear component standard deviation, In the center is one of the non-weak signal of the absolute value of the instantaneous frequency standard deviation, a signal to one of the instantaneous frequency of the power spectral density of the maximum, According to 16QAM and QPSK signals XI axis projection in the different performance parameters raised.

提取信号七个基于瞬时信息的特征：零中心归一化瞬时幅度功率谱密度的最大值，零中心归一化瞬时幅度绝对值的标准偏差，零中心非弱信号段瞬时相位非线性分量绝对值标准偏差，零中心非弱信号段瞬时相位非线性分量标准偏差，零中心归一化的非弱信号段瞬时频率绝对值的标准偏差，一个信号段的归一化瞬时频率功率谱密度的最大值，根据信号 QPSK 和16QAM在 XI 轴投影的不同表现，提出特征参数。

State Information Center, the latest projections indicate that: the effect of macroeconomic regulation and control has begun to show investment in fixed assets, increase in peak, the month in April to invest 398.9 billion yuan more than in March fell 8.8 percentage points; the means of production started to diminish rising prices, since the 3 Since mid-on, wire, rebar and other construction steel prices fell a total of 750 yuan / ton, down 17 percent margin above; in the loan supply is still faster circumstances, the loan rate or the emergence of signs of weakening, April balance of loans in RMB 16.94 trillion yuan last year, down 0.8 percentage points over the same period.

国家信息中心最新的预测表明：影响的宏观调控已开始显示，固定资产投资增长高峰期， 4月当月投资三千九百八十九万点零零零万元超过3月份下降8.8个百分点；手段生产开始减弱物价上涨，自3中旬以来的，铁丝，钢筋和其他建筑钢材价格下跌，共750元/吨，下跌幅度超过百分之十七；在贷款供应仍然较快的情况下，贷款利率或出现减弱的迹象， 4月贷款余额人民币十六万九千四点零零亿元去年下降0.8个百分点，较上年同期。

Using the concept of Boolean functions and combinatorics theory comprehensively, we investigate the construction on annihilators of Boolean functions and the algebraic immunity of symmetric Boolean functions in cryptography:Firstly, we introduce two methods of constructing the annihilators of Boolean functions, Construction I makes annihilators based on the minor term expression of Boolean function, meanwhile we get a way to judge whether a Boolean function has low degree annihilators by feature matrix. In Construction II, we use the subfunctions to construct annihilators, we also apply Construction II to LILI-128 and Toyocrypt, and the attacking complexity is reduced greatly. We study the algebraic immunitiy of (5,1,3,12) rotation symmetric staturated best functions and a type of constructed functions, then we prove that a new class of functions are invariants of algebraic attacks, and this property is generalized in the end.Secondly, we present a construction on symmetric annihilators of symmetric Boolean functions.

本文主要利用布尔函数的相关概念并结合组合论的相关知识，对密码学中布尔函数的零化子构造问题以及对称布尔函数代数免疫性进行了研究，主要包括以下两方面的内容：首先，给出两种布尔函数零化子的构造方法，构造Ⅰ利用布尔函数的小项表示构造零化子，得到求布尔函数f代数次数≤d的零化子的算法，同时得到通过布尔函数的特征矩阵判断零化子的存在性：构造Ⅱ利用布尔函数退化后的子函数构造零化子，将此构造方法应用于LILI-128，Toyocrypt等流密码体制中，使得攻击的复杂度大大降低；通过研究(5，1，3，12)旋转对称饱和最优函数的代数免疫和一类构造函数的代数免疫，证明了一类函数为代数攻击不变量，并对此性质作了进一步推广。

By using Jordan-Hlder type theorem of table algebras, we prove that table algebras satisfying nilpotent extension condition are nilpotent, which does not correspond to extension problems of nilpotent groups exactly.

本文研究了幂零表代数的一个有趣的性质，利用表代数的Jorda-Hlder型定理，证明了表代数满足幂零被幂零扩张仍是幂零的，但有限幂零群没有这样的扩张。

In general, the dipole components are located at the zero potential plane, called null plane. However, for 3D topographic mapping, many zero potential points can be detected. Instead of testing all the possible points, the proposed approach is to fit the selected zero potentials in terms of a linear plane, i.e. null plane, via least square approach.

一般来说，电偶极的位置都在零电位面上，为了取得零电位面，本研究在三度空间拓朴图映射中找出多点零电位点，然后采用最小平方法，找出一个线性平面通过这些零电位点当做零电位面。

Following a review, the Government is developing a new technical curriculum for prevocational and secondary technical schools for implementation from the 2000-01 school year, to keep abreast of the community's changing needs.

政府现正根据一项检讨的结果，为职业先修及工业中学编订一套新的工艺课程，使能配合社会不断转变的需要。新课程预计于二零零零至二零零一学年起推行。

Unfortunately, due to the restriction on the number of fleet imposed by the Government and the further commissioned of MAN single-decker and Dennis Trident, CityBus abandoned some B6 in the fleet. These included the unique 1301, Plaxton body B6LE 1304 and 1305, all ALX200 body B6LE and Plaxton Pointer dual doors designed body B6LE, most of the B6 were shipped back to UK and continue their service life in Stagecoach subsidies while only 10 Plaxton Pointer dual doors designed body can be found in New Zealand.

可惜的是，由於受到车队限额的规限，加上大量猛狮单层巴士之投入服务，以及替新的丹尼士三叉戟巴士出牌，城巴只好於二零零零年至二零零一年放弃部份B6，当中包括独一无二的1301，车队编号1304及1305，全数ALX200及Plaxton Pointer双门车身B6LE，大部份B6LE都是被运返英国，在Stagecoach的巴士公司继续服务乘客，只有十架Plaxton Pointer双门车身B6LE被运往Stagecoach於纽西兰的公司服务乘客。

Three paramter method for solving zero input response and zero state response of DC one order circuit is presented,and zero input response and zero state response resolved from full response are identificated and demonstrated.

提出应用三要素法求解直流一阶电路零输入响应和零状态响应的方法，并对从完全响应中分解零输入响应和零状态响应进行了辨析、论证，同时指出：应用三要素法进行零输入响应和零状态响应的分解，必须服从基本定

Pilot zero sequence directional protection may fail to operate because the zero sequence current on one end does not reach the set value of the protective relay,although zero sequence directional elements on both ends operate correctly.

线路发生接地故障时，两侧零序阻抗相差过大将导致两侧零序电流差别过大，虽然两侧的零序方向元件均能正确动作，但是由于一侧零序电流达不到动作定值，从而造成纵联零序方向保护拒动。

To run a 1,000 watt stove, you would need 800 square meters of cuprous oxide, and another 800 square meters of plain copper, or 1,600 square meters all together.

运行一零零零瓦特炉灶，您将需要800平方米的氧化亚铜，另有800平方米的平原铜，或一六零零平方米所有在一起。

On the other hand, the more important thing is because the urban housing is a kind of heterogeneity products.

另一方面，更重要的是由于城市住房是一种异质性产品。

Climate histogram is the fall that collects place measure calm value, cent serves as cross axle for a few equal interval, the area that the frequency that the value appears according to place is accumulated and becomes will be determined inside each interval, discharge the graph that rise with post, also be called histogram.

气候直方图是将所收集的降水量测定值，分为几个相等的区间作为横轴，并将各区间内所测定值依所出现的次数累积而成的面积，用柱子排起来的图形，也叫做柱状图。