拟周期的

Thus, if one compares the length of the cycle to the amount of light apparent to the observer it is possible to accurately prepare an estimate of the distance to the cepheid.

因此，如果一个比较长的周期，以光线的量明显的观察是可能的准确地拟出一个估计的距离到cepheid。

Three classes of equivalent system methods which are used in finding high order flight control systems low order equivalent are studied. The first class methods are the classical frequency domain-based equivalent system methods which recommended by MIL-F-8785C and MIL-STD-1797A. Five longitudinal low order equivalent systems and fourteen lateral ones are discussed in detail and some pieces of advice are given. Also conduct an investigation in the time domain-based equivalent system methods .

研究了求取高增稳飞机的低阶等效系统的几种方法：研究了经典的频域等效系统方法，针对纵向5种、横向14种构型的低阶等效系统进行了拟配实践，并提出一些有益的看法；以频域等效系统方法为基础，提出了时域等效系统新方法；以最小二乘辨识为基础，提出了两种纵向短周期低阶等效系统时域辨识方法(等效延迟时间τ_q参与或不参与)。

the paper introduces long curtate new unequal ofdm system.adopts long curtate unequal benefit to be not to require that the second order adding the circulation prefix,being therefore likely to lead into period stationarity,making use of signal therefore in launching an array,counting characteristic property realizing blind estimation of route.this technology includes three kinds of method : subspace decomposition,correlation matching,and maximum likeewise,monte carlo simulation show that whentheeb/no is low,function is better than the other kinds of method.

摘 要：提出一种采用不等长分组新的ofdm系统。采用不等长分组的好处是不需要加循环前缀就能在发射序列中引入周期平稳性，因此，可利用信号的二阶统计特性实现信道盲估计。信道盲估计主要分子空间分解、相关拟合和最大似然三种方法。结合monte carlo仿真表明，在信噪比较低时，结合子空间分解方法计算出的误码性能比其余两种方法好。

The relations of inducing skin current of shielding layer, core voltage and core current with the environment field were obtained. The change of shield layer current wave with grounding state of external shield and core voltage with loading resistance was analyzed. According to the dependence of shield layer current oscillating frequency on electromagnetic wave propagation velocity, conception of transporting line of shield layer-ground with equivalent relative dielectric constant was presented. fited equation of equivalent relative dielectric constant with change of cable height was given.

试验得到九芯电缆屏蔽层感应电流、芯线感应电压、芯线感应电流以及环境场之间的关系；分析了皮电流波形随外皮接地状态的变化，芯电压随负载电阻的变化；基于皮电流振荡频率与电磁波传播速度的关系，提出了屏蔽层-大地"传输线"等效相对介电常数概念，给出了等效相对介电常数随电缆高度变化的拟合式；皮电流计算与测量结果在波形、振荡周期、衰减规律等方面有较好的一致性。

At the same time the new algorithm is applied to find necessary conditions for such isochronous center, then proofs of isochronicity of these systems by using some effective methods are given.

同时通过一种最新算法求出无穷远点为中心时的周期常数，得到了拟等时中心的必要条件，并利用一些有效途径一一证明了条件的充分性。

At present we have the deeper acknowledge for the molecular mechanism of flowering by studying the long-day plant Arabidopsis which is a model plant for the study of photoperiodic control of floral initiation.

近年来通过对模式植物拟南芥突变体的遗传研究、基因分离及功能分析，使人们对光周期诱导开花的分子机制有了新的认识。

Methods 136 patients with suspected or diagnosed coronary artery disease were studied with 16-slice spiral CT. Choosing left and right coronary artery in the axial enhancement scanning images, previewing 10 images at 0%-100% of the cardiocycle in increments of 10%, We evaluated grade of the image quality and number of the ratable coronary artery in different reconstruction phases. We selected the most clear image of left and right coronary artery, and recorded the phase. Raw data were reconstructed with thin images at the best phase.

对136例临床诊断或拟诊冠心病的患者行16层螺旋CT冠状动脉造影，选取增强扫描R-R心动周期0%~100%的10组图像（间隔10%），评价不同重建时相冠状动脉各主要分支的图像质量等级及可评价冠状动脉数，选择显示最清晰的一组记录时相。

Rupture of fractal curves is controled using support vector machine function regression in the later period of fractal interpolation.

为消除分形插值曲线的断裂和周期现象，论文提出在分形插值的后期使用基于统计学习理论的支持向量机函数拟合方法。

This thesis,starting from working out the arrest points and the infl ection points of the function curves of the grey mathema tical model GM(1:1 )and its residual correction model and residual period model, derives the conditions for empliying these grey models to obtain a higher class of accuracy,thus enabling the user to decide which model should be used in the light of the state of given initial sequency data.

从求得灰色数学模型GM(1.1)及其残差指数修正模型和残差周期修正模型函数曲线的驻点与拐点入手，导出使用这些灰色模型取得较高精度的条件，让使用者可依据初始序列数据的态势决定采用哪种数学模型，并且在结果未揭示以前便可大体上估计到拟合精度是否令人满意。

Due to the area of coal dump site is very large in china, which results the expense and the timeperiod would be very long, as a result, this paper uses the calculated simulation method regardingthis problem.

由于在中国煤炭堆场的区域较大，采用风洞试验的方法研究防风网的抑尘效果所需费用及周期将会很大，本文拟采用数值模拟方法对此问题进行研究。

Neither the killing of Mr Zarqawi nor any breakthrough on the political front will stop the insurgency and the fratricidal murders in their tracks.

在对危险的南部地区访问时，他斥责什叶派民兵领导人对中央集权的挑衅行为。

In fact,I've got him on the satellite mobile right now.

实际上 我们已接通卫星可视电话了